WO2017049630A1 - 小区切换方法、装置及设备 - Google Patents

小区切换方法、装置及设备 Download PDF

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Publication number
WO2017049630A1
WO2017049630A1 PCT/CN2015/090824 CN2015090824W WO2017049630A1 WO 2017049630 A1 WO2017049630 A1 WO 2017049630A1 CN 2015090824 W CN2015090824 W CN 2015090824W WO 2017049630 A1 WO2017049630 A1 WO 2017049630A1
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WO
WIPO (PCT)
Prior art keywords
target cell
information
cell
user terminal
scheduling resource
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PCT/CN2015/090824
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English (en)
French (fr)
Inventor
唐珣
权威
张戬
苗金华
高永强
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2015/090824 priority Critical patent/WO2017049630A1/zh
Priority to CN201580071477.1A priority patent/CN107113675B/zh
Priority to EP15904506.1A priority patent/EP3340682B1/en
Priority to AU2015409753A priority patent/AU2015409753B2/en
Publication of WO2017049630A1 publication Critical patent/WO2017049630A1/zh
Priority to US15/928,999 priority patent/US10798628B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to a cell handover technology, and in particular, to a cell handover method, apparatus, and device.
  • the advantage of the wireless communication system over the wired communication system is that the UE (User Equipment) can move freely.
  • the movement of the UE in the cellular communication system may result in a change of the serving cell, a process called a cell handover procedure.
  • Figure 1 shows a flow chart of a prior art cell handover procedure.
  • LTE Long Term Evolution
  • the handover procedure includes:
  • the UE completes the neighboring cell measurement according to the configuration of the source eNB and feeds back a measurement report (Measurement reort) to the source eNB.
  • the source eNB determines whether the handover needs to be performed according to the signal strength of the neighboring cell and the local cell. If the handover is required, the B step is performed.
  • step C is performed.
  • the target eNB feeds back a handover acknowledgement message to the source eNB.
  • the above process is called a handover preparation phase.
  • the source eNB then sends a handover command to the UE.
  • the UE disconnects from the source eNB, and data transmission stops.
  • the UE starts to listen to the downlink synchronization information of the target cell, and after completing the downlink synchronization, starts the random access process.
  • the UE sends a random access preamble signal, and after detecting the preamble sequence, the target eNB sends an uplink transmission resource, such as an UL-Grant (Uplink Grant, an uplink scheduling resource indication), and the like, and after receiving the UL-Grant, the UE sends the target to the target eNB.
  • Feedback handover complete message (handover complete).
  • the handover process is completed and the data transmission is resumed.
  • the target eNB also sends an uplink path update message (Uplink plane update) to the MME (Mobility Management Entity)/UPE (User Plan Entity).
  • Uplink plane update Uplink plane update
  • MME Mobility Management Entity
  • User Plan Entity User Plan Entity
  • the data transmission interruption time is relatively long, and the average time is about 50 ms.
  • the cell handover may destroy the continuity of data transmission. Affect the user experience.
  • the cell handover method, device and device provided by the embodiments of the present invention are used to reduce the delay time in the cell handover process.
  • an embodiment of the present invention provides a cell handover method, where the method includes:
  • the user terminal receives the handover command sent by the source cell, where the handover command carries the prompt information of the uplink scheduling resource indication of the target cell;
  • the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the switching command further carries a timing advance TA reminding information
  • the method further includes: determining, by the user terminal, the TA used by the user terminal in the target cell according to the TA prompt information;
  • the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, including:
  • the user terminal sends uplink data to the target cell according to the TA used by the target cell and the uplink scheduling resource indication.
  • the TA prompt information is a TA used by the user terminal in the target cell
  • the TA prompt information is first indication information indicating that the TA of the target cell is the same as the TA of the source cell;
  • Determining, by the user terminal, the TA used by the user terminal in the target cell according to the TA prompt information including:
  • the user terminal uses, according to the first indication information, the TA used by the user terminal in the source cell as the TA used in the target cell;
  • the TA prompt information includes a TA of the source cell, second indication information indicating that the TA of the target cell is calculated according to the TA of the source cell, and downlink signal transmission time information of the source cell and the target cell;
  • Determining, by the user terminal, the TA used by the user terminal in the target cell according to the TA prompt information including:
  • the user terminal detects, according to the second indication information, a downlink signal arrival time of the source cell and the target cell, respectively;
  • the user terminal determines the TA used by the user terminal in the target cell according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal sending time information is at least one of the following:
  • a third indication information indicating that the downlink signal of the source cell and the target cell is a synchronization signal
  • the downlink signal sending time of the source cell and the downlink signal sending time of the target cell are included;
  • the time difference is sent for the downlink signals of the target cell and the source cell.
  • the switching command further carries uplink transmit power prompt information.
  • the method further includes: determining, by the user terminal, uplink transmit power of the user terminal in the target cell according to the uplink transmit power prompt information;
  • the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, including:
  • the user terminal sends uplink data to the target cell by using the uplink transmit power according to the uplink scheduling resource indication.
  • the uplink transmit power prompt information is an uplink transmit power used by the user terminal in the target cell
  • the uplink transmit power prompt information is offset information that is offset based on uplink transmit power of the source cell
  • the uplink transmit power prompt information is used to indicate that the user terminal is according to the target cell
  • the fourth signal indicating the uplink transmit power of the user terminal in the target cell is determined by the downlink signal transmission power and the downlink signal received power;
  • Determining, by the user terminal, the uplink transmit power of the user terminal in the target cell according to the uplink transmit power prompt information including:
  • the user terminal receives a cell broadcast message of the target cell according to the fourth indication information, where the cell broadcast message carries a downlink signal transmission power of the target cell;
  • the user terminal determines an uplink transmit power of the user terminal in the target cell according to the downlink path loss value and a preset received power of the target cell.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information indicated by the uplink scheduling resource includes PDCCH monitoring indication information used to indicate that the user terminal monitors a physical downlink control channel PDCCH of the target cell;
  • Determining, by the user terminal, the uplink scheduling resource indication of the target cell according to the prompt information indicated by the uplink scheduling resource including:
  • the user terminal monitors the PDCCH according to the PDCCH monitoring indication information
  • the user terminal determines an uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH that is monitored.
  • the PDCCH monitoring indication information includes: monitoring effective time information of the PDCCH;
  • the user terminal listening to the PDCCH according to the PDCCH monitoring indication information includes:
  • the user equipment monitors the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the user terminal after determining the uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH, and before sending the uplink data to the target cell, the method further includes:
  • the user terminal sends an acknowledgement ACK message to the target cell on the physical uplink control channel PUCCH corresponding to the PDCCH, where the target cell determines, according to the ACK message, that the user terminal has listened to the PDCCH;
  • the user terminal sends a demodulation reference signal DMRS to the target cell on the communication resource indicated by the uplink scheduling resource indication, where the uplink scheduling resource indication carries a first cyclic shift for instructing the user terminal to send the DMRS.
  • the cyclic shift value of the DMRS sent by the user terminal is a second cyclic shift value different from the first cyclic shift value, and is used by the target cell according to the DMRS sent by the user terminal. It is determined that the user terminal has listened to the PDCCH.
  • an embodiment of the present invention provides a cell handover method, including:
  • the source cell sends a handover command to the user terminal, where the handover command carries the prompt information of the uplink scheduling resource indication, where the prompt information indicated by the uplink scheduling resource is used by the user terminal to determine an uplink scheduling of the target cell.
  • the resource indicates that the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the source cell acquires the prompt information of the uplink scheduling resource indication of the target cell, including:
  • the source cell sends a handover request message to the target cell
  • the source cell receives the handover confirmation message sent by the target cell, where the handover confirmation message carries the prompt information indicated by the uplink scheduling resource.
  • the handover request message carries uplink scheduling resource indication request information.
  • the handover confirmation message further carries a TA of the target cell
  • the handover command further carries TA prompt information, where the TA prompt information is a TA of the target cell.
  • the handover request message further carries target cell TA request information.
  • the handover acknowledgement message further carries a downlink signal sending moment of the target cell
  • the method further includes: determining, by the source cell, downlink signal sending time information of the source cell and the target cell according to the downlink signal sending time of the target cell and the downlink signal sending time of the source cell;
  • the source cell generates TA prompt information, where the TA prompt information includes a TA of the source cell, the second indication information, and the downlink signal sending time information;
  • the handover command further includes the TA prompt information, where the user terminal separately detects a downlink signal arrival time of the source cell and the target cell according to the second indication information, according to a downlink signal arrival time of the source cell and the target cell, and The downlink signal transmission time information of the source cell and the target cell determines the downlink synchronization delay difference between the source cell and the target cell, and determines the TA of the target cell according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal sending time information includes a downlink signal sending time of the source cell and a downlink signal sending time of the target cell;
  • the downlink signal transmission time information is a downlink signal transmission time difference between the target cell and the source cell.
  • the handover request message further carries the target cell downlink signal sending time request information.
  • the method further includes: acquiring, by the source cell, a timing advance TA prompt information of the target cell;
  • the handover command further includes the TA prompt information, where the user terminal determines, according to the TA prompt information, the TA used by the user terminal in the target cell.
  • the source cell acquires the timing advance TA prompt information of the target cell, including:
  • the source cell determines that the downlink signal of the target cell is a synchronization signal, and generates a small source for indicating The downlink signal of the area and the target cell is the third indication information of the synchronization signal, where the third indication information is the downlink signal transmission time information of the source cell and the target cell;
  • the source cell determines a TA calculation capability that the user terminal has, and generates second indication information for instructing the user terminal to calculate a TA of the target cell according to the TA of the source cell;
  • the source cell generates the TA prompt information, where the TA prompt information includes the TA of the source cell, the second indication information, and the downlink signal sending time information, where the user terminal separately uses the second indication information according to the second indication information.
  • the source cell acquires the timing advance TA prompt information of the target cell, including:
  • the source cell determines that the TA prompt information is the first indication information indicating that the TA of the target cell is the same as the TA of the source cell, and is used by the user terminal to set the TA of the source cell according to the first indication information. TA as the target cell.
  • the method further includes:
  • the handover command carries the uplink transmit power prompt information.
  • the uplink transmit power prompt information is an uplink transmit power that is used by the user terminal in the target cell that is preset by the source cell;
  • the uplink transmit power prompt information is offset information that is preset in the source cell and is offset based on an uplink transmit power of the source cell;
  • the uplink transmit power prompt information is a fourth indication that the source cell instructs the user terminal to determine an uplink transmit power of the user terminal in the target cell according to downlink signal transmission power and downlink signal received power of the target cell.
  • Information for the user terminal according to the fourth finger The indication information is received by the cell broadcast message of the target cell, where the cell broadcast message carries the downlink signal transmission power of the target cell, and the user terminal determines the downlink signal reception power according to the received cell broadcast message. Determining, by the user terminal, a downlink path loss value of the target cell according to the downlink signal transmission power and the downlink signal received power; and the user terminal according to the downlink path loss value and a preset target cell expected reception Power, determining the uplink transmit power of the user terminal in the target cell.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information of the uplink scheduling resource indication includes PDCCH monitoring indication information used by the user terminal to monitor the physical downlink control channel PDCCH of the target cell, where the user equipment monitors according to the PDCCH monitoring indication information.
  • the PDCCH the user terminal determines an uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH that is monitored.
  • the PDCCH monitoring indication information includes: a monitoring effective time information of the PDCCH, where the user equipment is used to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • an embodiment of the present invention provides a cell handover method, including:
  • the target cell Sending, by the target cell, a handover confirmation message to the source cell, where the handover confirmation message carries prompt information of an indication of an uplink scheduling resource, where the handover confirmation message is used by the source cell according to the cutting And the acknowledgment message is sent to the user terminal, where the handover command carries the prompt information of the uplink scheduling resource indication, where the prompt information indicated by the uplink scheduling resource is used by the user terminal to determine an uplink scheduling resource indication of the target cell;
  • the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the handover request message carries uplink scheduling resource indication request information.
  • the handover confirmation message further carries a TA of the target cell, where the source cell uses the TA of the target cell as the TA prompt information.
  • the handover request message further carries target cell TA request information.
  • the handover confirmation message further includes a downlink signal sending time of the target cell, where the source cell determines the source cell and the target according to the downlink signal sending time of the target cell and the downlink signal sending time of the source cell.
  • the downlink signal of the cell transmits time information.
  • the handover request message further carries the target cell downlink signal sending time request information.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information of the uplink scheduling resource indication includes PDCCH monitoring indication information used by the user terminal to monitor the physical downlink control channel PDCCH of the target cell, where the user equipment monitors according to the PDCCH monitoring indication information.
  • the PDCCH the user terminal determines an uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH that is monitored.
  • the PDCCH monitoring indication information includes: a monitoring effective time information of the PDCCH, where the user equipment is used to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the method further includes:
  • the target cell receives the uplink data on the communication resource corresponding to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover completion message, a buffer status report, and service data;
  • the target cell detects an acknowledgement ACK message on the communication resource corresponding to the uplink scheduling resource indication, and determines, according to the ACK message, that the user terminal has detected the PDCCH;
  • the target cell detects a demodulation reference signal DMRS on the communication resource corresponding to the uplink scheduling resource indication;
  • the target cell determines whether the detected cyclic shift value of the DMRS is the same as the first cyclic shift value carried in the uplink scheduling resource indication, and if not, determines that the user terminal has detected the PDCCH.
  • an embodiment of the present invention provides a cell switching device, where the device functions as a user terminal, and includes:
  • the receiving module is configured to receive a handover command sent by the source cell, where the handover command carries the prompt information of the uplink scheduling resource indication of the target cell;
  • an uplink scheduling resource indication determining module configured to determine, according to the prompt information indicated by the uplink scheduling resource, an uplink scheduling resource indication of the target cell;
  • a sending module configured to send uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the device further includes: a TA determining module;
  • the switching command further carries a timing advance TA reminding information
  • the TA determining module configured to determine, according to the TA prompt information, a TA used by the user terminal in the target cell;
  • the sending module is specifically configured to send uplink data to the target cell according to the TA used by the target cell and the uplink scheduling resource indication.
  • the TA prompt information is a TA used by the user terminal in the target cell
  • the TA prompt information is first indication information indicating that the TA of the target cell is the same as the TA of the source cell;
  • the TA determining module is specifically configured to use, according to the first indication information, a TA used by the user terminal in the source cell as a TA used in a target cell;
  • the TA prompt information includes a TA of the source cell, second indication information indicating that the TA of the target cell is calculated according to the TA of the source cell, and downlink signal transmission time information of the source cell and the target cell;
  • the TA determining module is specifically configured to detect, according to the second indication information, a downlink signal arrival time of the source cell and the target cell, respectively;
  • the downlink signal sending time information is at least one of the following:
  • a third indication information indicating that the downlink signal of the source cell and the target cell is a synchronization signal
  • the downlink signal sending time of the source cell and the downlink signal sending time of the target cell are included;
  • the time difference is sent for the downlink signals of the target cell and the source cell.
  • the device further includes: an uplink transmit power determining module;
  • the handover command further carries uplink transmit power prompt information
  • the uplink transmit power determining module is configured to determine, according to the uplink transmit power prompt information, an uplink transmit power of the user terminal in the target cell;
  • the sending module is specifically configured to send uplink data to the target cell by using the uplink transmit power according to the uplink scheduling resource indication.
  • the uplink transmit power prompt information is an uplink transmit power used by the user terminal in the target cell
  • the uplink transmit power prompt information is offset information that is offset based on uplink transmit power of the source cell
  • the uplink transmit power prompt information is fourth indication information indicating that the user terminal determines the uplink transmit power of the user terminal in the target cell according to the downlink signal sending power and the downlink signal received power of the target cell;
  • the uplink transmit power determining module is configured to receive, according to the fourth indication information, a cell broadcast message of the target cell, where the cell broadcast message carries a downlink signal sending power of the target cell; according to the received Determining the downlink signal receiving power according to the cell broadcast message; determining a downlink path loss value of the target cell according to the downlink signal sending power and the downlink signal receiving power; according to the downlink path loss value and a preset target The expected received power of the cell determines the uplink transmit power of the user terminal in the target cell.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information indicated by the uplink scheduling resource includes PDCCH monitoring indication information used to indicate that the user terminal monitors a physical downlink control channel PDCCH of the target cell;
  • the uplink scheduling resource indication determining module is specifically configured to listen to the PDCCH according to the PDCCH monitoring indication information
  • the PDCCH monitoring indication information includes: monitoring effective time information of the PDCCH;
  • the uplink scheduling resource indication determining module is specifically configured to: according to the monitoring of the PDCCH The effect time information listens to the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the foregoing apparatus further includes: a PDCCH detection and confirmation module, configured to determine, according to the downlink control information DCI transmitted on the PDCCH, the uplink scheduling resource indication of the target cell, before sending the uplink data, An ACK message is sent to the target cell on the physical uplink control channel PUCCH corresponding to the PDCCH, and the target cell determines, according to the ACK message, that the user terminal has listened to the PDCCH;
  • a PDCCH detection and confirmation module configured to determine, according to the downlink control information DCI transmitted on the PDCCH, the uplink scheduling resource indication of the target cell, before sending the uplink data, An ACK message is sent to the target cell on the physical uplink control channel PUCCH corresponding to the PDCCH, and the target cell determines, according to the ACK message, that the user terminal has listened to the PDCCH;
  • the PDCCH detection and confirmation module is configured to: after determining the uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH, and before sending the uplink data, scheduling the resource indication indication in the uplink Sending, by the indicated communication resource, a demodulation reference signal DMRS to the target cell, where the uplink scheduling resource indication carries a first cyclic shift value for indicating that the user terminal sends the DMRS, and the DMRS sent by the user terminal
  • the cyclic shift value is a second cyclic shift value different from the first cyclic shift value, and is used by the target cell to determine that the user terminal has listened to the PDCCH according to the DMRS sent by the user equipment.
  • an embodiment of the present invention provides a cell switching device, where the device functions as a source cell communication terminal, and includes:
  • An information acquiring module configured to acquire prompt information of an uplink scheduling resource indication of a target cell
  • a handover command sending module configured to send a handover command to the user terminal, where the handover command carries the prompt information of the uplink scheduling resource indication, where the prompt information indicated by the uplink scheduling resource is used by the user terminal to determine the
  • the uplink scheduling resource of the target cell indicates that the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover completion message, a buffer status report, and service data.
  • the information acquiring module is configured to send a handover request message to the target cell, and receive a handover confirmation message sent by the target cell, where the handover confirmation message carries the prompt information of the uplink scheduling resource indication .
  • the handover request message carries uplink scheduling resource indication request information.
  • the handover confirmation message further carries a TA of the target cell
  • the handover command further carries TA prompt information, where the TA prompt information is a TA of the target cell.
  • the handover request message further carries target cell TA request information.
  • the handover acknowledgement message further carries a downlink signal sending moment of the target cell
  • the information acquiring module is further configured to determine downlink signal sending time information of the source cell and the target cell according to the downlink signal sending time of the target cell and the downlink signal sending time of the source cell;
  • the TA prompt information includes a TA of the source cell, the second indication information, and the downlink signal sending time information;
  • the handover command further includes the TA prompt information, where the user terminal separately detects a downlink signal arrival time of the source cell and the target cell according to the second indication information, according to a downlink signal arrival time of the source cell and the target cell, and The downlink signal transmission time information of the source cell and the target cell determines the downlink synchronization delay difference between the source cell and the target cell, and determines the TA of the target cell according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal sending time information includes a downlink signal sending time of the source cell and a downlink signal sending time of the target cell;
  • the downlink signal transmission time information is a downlink signal transmission time difference between the target cell and the source cell.
  • the handover request message further carries the target cell downlink signal sending time request information.
  • the information acquiring module is further configured to acquire, according to the timing advance TA prompt information of the target cell,
  • the handover command further includes the TA prompt information, where the user terminal determines, according to the TA prompt information, the TA used by the user terminal in the target cell.
  • the information acquiring module is specifically configured to determine that the downlink signal of the target cell is the same Step signal, generating third indication information for indicating that the downlink signal of the source cell and the target cell is a synchronization signal, where the third indication information is downlink signal transmission time information of the source cell and the target cell, and is generated to indicate the user terminal Calculating, according to the TA of the source cell, the second indication information of the TA of the target cell, and generating the TA prompt information, where the TA prompt information includes the TA of the source cell, the second indication information, and the downlink signal sending time information,
  • the user terminal detects the downlink signal arrival time of the source cell and the target cell according to the second indication information, and determines the source according to the downlink signal arrival time of the source cell and the target cell and the downlink signal transmission time information of the source cell and the target cell.
  • the downlink synchronization delay difference between the cell and the target cell determines the TA of the target cell according to the downlink synchronization delay difference and the TA of
  • the information acquiring module is specifically configured to determine whether the source cell and the target cell are in a coordinated multi-point transmission COMP communication scenario; if yes, determining that the TA prompt information is a TA indicating a target cell
  • the first indication information that is the same as the TA of the source cell is used by the user terminal to use the TA of the source cell as the TA of the target cell according to the first indication information.
  • the information acquiring module is further configured to obtain, according to the uplink transmit power prompt information, the user terminal, in the uplink transmit power prompt information of the user terminal, The uplink transmit power of the target cell;
  • the handover command carries the uplink transmit power prompt information.
  • the uplink transmit power prompt information is an uplink transmit power that is used by the user terminal in the target cell that is preset by the source cell;
  • the uplink transmit power prompt information is offset information that is preset in the source cell and is offset based on an uplink transmit power of the source cell;
  • the uplink transmit power prompt information is a fourth indication that the source cell instructs the user terminal to determine an uplink transmit power of the user terminal in the target cell according to downlink signal transmission power and downlink signal received power of the target cell. And the information that is used by the user terminal to receive, according to the fourth indication information, a cell broadcast message of the target cell, where the cell broadcast message carries a downlink signal sending power of the target cell; and the user terminal according to the received The cell broadcast message determines the downlink signal receiving power; the user terminal determines a downlink path loss value of the target cell according to the downlink signal sending power and the downlink signal receiving power; the user terminal is configured according to the The downlink path loss value and the preset received power of the target cell determine the uplink transmit power of the user terminal in the target cell.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information of the uplink scheduling resource indication includes PDCCH monitoring indication information used by the user terminal to monitor the physical downlink control channel PDCCH of the target cell, where the user equipment monitors according to the PDCCH monitoring indication information.
  • the PDCCH the user terminal determines an uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH that is monitored.
  • the PDCCH monitoring indication information includes: a monitoring effective time information of the PDCCH, where the user equipment is used to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • an embodiment of the present invention provides a cell switching device, where the device is a target cell communication terminal, including:
  • a receiving module configured to receive a handover request message sent by the source cell
  • a handover confirmation message sending module configured to send a handover confirmation message to the source cell, where the handover confirmation message carries the prompt information of the uplink scheduling resource indication, where the handover confirmation message is used by the source cell according to the handover confirmation message to the user
  • the terminal sends a handover command, where the handover command carries the prompt information of the uplink scheduling resource indication, where the prompt information indicated by the uplink scheduling resource is used by the user terminal to determine an uplink scheduling resource indication of the target cell;
  • Said upper The line scheduling resource indicates to send uplink data to the target cell, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the handover request message carries uplink scheduling resource indication request information.
  • the handover confirmation message further carries a TA of the target cell, where the source cell uses the TA of the target cell as the TA prompt information.
  • the handover request message further carries target cell TA request information.
  • the handover confirmation message further includes a downlink signal sending time of the target cell, where the source cell determines the source cell and the target according to the downlink signal sending time of the target cell and the downlink signal sending time of the source cell.
  • the downlink signal of the cell transmits time information.
  • the handover request message further carries the target cell downlink signal sending time request information.
  • the prompt information indicated by the uplink scheduling resource includes an uplink scheduling resource indication of the target cell and an uplink scheduling resource indication effective time information.
  • the uplink scheduling resource indication effective time information includes at least one of the following information:
  • the effective time indicated by the uplink scheduling resource indication is the effective time indicated by the uplink scheduling resource indication.
  • the prompt information of the uplink scheduling resource indication includes PDCCH monitoring indication information used by the user terminal to monitor the physical downlink control channel PDCCH of the target cell, where the user equipment monitors according to the PDCCH monitoring indication information.
  • the PDCCH the user terminal determines an uplink scheduling resource indication of the target cell according to the downlink control information DCI transmitted on the PDCCH that is monitored.
  • the PDCCH monitoring indication information includes: a monitoring effective time information of the PDCCH, where the user equipment is used to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring validity time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the receiving module is further configured to receive uplink data on a communication resource corresponding to the uplink scheduling resource indication;
  • the receiving module is further configured to: detect an acknowledgement ACK message on the communication resource corresponding to the uplink scheduling resource indication, and determine, according to the ACK message, that the user terminal has detected the PDCCH;
  • the receiving module is further configured to: detect, according to the communication resource corresponding to the uplink scheduling resource indication, a demodulation reference signal DMRS; determine whether the detected cyclic shift value of the DMRS is in the uplink scheduling resource indication The first cyclic shift value carried is the same. If different, it is determined that the user terminal has detected the PDCCH.
  • an embodiment of the present invention provides a user terminal device, including: a communication interface, a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate through the communication bus ;
  • the memory is configured to store a program, and the processor is configured to execute the program stored by the memory;
  • the processor runs a program, and the program includes:
  • uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • an embodiment of the present invention provides a terminal device, including: a communication interface, a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate through the communication bus;
  • the memory is configured to store a program, and the processor is configured to execute the program stored by the memory;
  • the processor runs a program, and the program includes:
  • the handover command carries the prompt information indicated by the uplink scheduling resource
  • the prompt information indicated by the uplink scheduling resource is used by the user terminal
  • Determining an uplink scheduling resource indication of the target cell where the user terminal sends uplink data to the target cell according to the uplink scheduling resource indication, where the uplink data includes at least one of the following: a handover completion message, a buffer status report, and Business data.
  • an embodiment of the present invention provides a terminal device, including: a communication interface, a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate through the communication bus;
  • the memory is configured to store a program, and the processor is configured to execute the program stored by the memory;
  • the processor runs a program, and the program includes:
  • the handover confirmation message carries the prompt information of the uplink scheduling resource indication
  • the handover confirmation message is used by the source cell to send a handover command to the user terminal according to the handover confirmation message
  • the handover The command carries the prompt information of the indication of the uplink scheduling resource, where the prompt information indicated by the uplink scheduling resource is used by the user terminal to determine an uplink scheduling resource indication of the target cell, and the user terminal is directed to the target according to the uplink scheduling resource indication.
  • the cell sends uplink data, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the UE acquires uplink transmission resources such as UL-Grant from the source cell, omits the random access procedure, shortens the data transmission interruption time, and reduces the data transmission delay time in the cell handover process.
  • Figure 1 shows a flow chart of a prior art cell handover procedure
  • FIG. 2 is a flowchart of a cell handover method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a second cell handover method according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for switching a three cell according to an embodiment of the present invention.
  • FIG. 5 is a signaling flowchart of a UE acquiring a target cell TA
  • FIG. 6 is a flow chart showing a first manner in which a UE acquires a UL-grant of a target cell
  • FIG. 7 is a flowchart showing a second manner in which a UE acquires a UL-grant of a target cell
  • FIG. 8 is a flowchart of a method for switching four cells according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of a five-cell handover method according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of a six-cell handover method according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for handover of a cell according to Embodiment 7 of the present invention.
  • FIG. 12 is a flowchart of a method for switching eight cells according to an embodiment of the present invention.
  • FIG. 13 is a flowchart of a method for handover of a nine cell according to an embodiment of the present invention.
  • FIG. 14 is a flowchart of a ten cell handover method according to an embodiment of the present invention.
  • FIG. 15 is a flowchart of a method for switching a cell according to an eleventh embodiment of the present invention.
  • FIG. 16 is a flowchart of a method for switching a twelve-cell according to an embodiment of the present invention.
  • FIG. 17 is a schematic structural diagram of a cell switching apparatus according to an embodiment of the present invention.
  • FIG. 18 is a schematic structural diagram of a second cell switching apparatus according to an embodiment of the present invention.
  • FIG. 19 is a schematic structural diagram of a three-cell switching apparatus according to an embodiment of the present invention.
  • FIG. 20 is a schematic structural diagram of a user terminal device according to an embodiment of the present invention.
  • 21 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
  • FIG. 22 is a schematic structural diagram of a terminal device according to Embodiment 2 of the present invention.
  • the technical solution of the present invention is described by taking the UE as a user terminal as an example.
  • the scheme for other devices as the user terminal is not described in detail.
  • the average time for data transmission interruption is 50 milliseconds.
  • the continuity of data transmission is disrupted and the user experience is affected.
  • the UE data transmission interruption is mainly caused by the UE acquiring the uplink transmission resource allocated by the target cell, such as UL-Grant, by using a random access procedure.
  • the delay on the UE side includes: waiting for random access time-frequency resources, transmitting a random preamble sequence, waiting for a random access response of the target cell, processing a random access response message, and waiting for an uplink transmission resource.
  • the embodiment of the present invention provides a cell handover method.
  • the UE acquires uplink transmission resources such as UL-Grant from the source cell, omits the random access process, and shortens the data transmission. Interruption time, thereby reducing the data transmission delay time during cell handover.
  • the cell handover method in the embodiment of the present invention may be applied to a scenario in which the source cell and the target cell belong to the same eNB, and may also be applied to a handover scenario in which the base station where the source cell is located and the base station where the target cell is located is different.
  • FIG. 2 is a flowchart of a cell handover method according to an embodiment of the present invention.
  • the main body of the method is a UE, and the main steps include:
  • Step S11 The UE receives the handover command sent by the source cell, where the handover command carries the UL-grant prompt information of the target cell.
  • the source cell determines that the UE performs cell handover, it sends a handover command to the UE, and carries the UL-grant prompt information in the handover command sent to the UE.
  • Step S12 The UE determines the UL-grant of the target cell according to the UL-grant prompt information.
  • the UE After receiving the handover command sent by the source cell, the UE obtains the UL-grant of the target cell according to the UL-grant prompt information in the handover command.
  • Step S13 The UE sends uplink data to the target cell according to the UL-grant.
  • the UE After determining the UL-grant of the target cell, the UE sends uplink data to the target cell according to the requirement, where the sent uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the UE may directly determine the UL-grant of the target cell according to the UL-grant prompt information carried in the handover command, omitting the random access procedure, thereby reducing the UE in the UE.
  • the transmission interruption time during cell handover is not limited to
  • FIG. 3 is a flowchart of a second cell handover method according to an embodiment of the present invention.
  • the main body of the process is a UE, and the main processing steps include:
  • Step S21 The UE receives the handover command sent by the source cell, where the handover command carries the UL-grant prompt information, the TA (Timing Advance) prompt information, and the uplink transmit power prompt information of the target cell.
  • the handover command carries the UL-grant prompt information, the TA (Timing Advance) prompt information, and the uplink transmit power prompt information of the target cell.
  • the UE needs to obtain the UL used by the UE in the target cell and the uplink transmit power of the UE to send data to the target cell.
  • the UE acquires the TA used in the target cell and the uplink transmission of the UE transmitting data to the target cell.
  • the power can be pre-configured in the UE, and the pre-configured data is directly used when the UE needs to perform cell handover.
  • the source cell indicates the TA used by the target cell communication and the uplink transmit power of the data to the target cell by using the prompt information.
  • the TA prompt information and the uplink transmit power prompt information are simultaneously carried in the handover command as an example.
  • the handover command sent by the source cell may carry any one of the TA prompt information and the uplink transmit power prompt information, and the information that is not carried may be obtained in other manners, for example, the UE advances.
  • the configuration is obtained in a manner that is not described in this embodiment.
  • Step S22 The UE determines the UL-grant of the target cell according to the UL-grant prompt information.
  • Step S23 The UE determines, according to the TA prompt information, the TA used by the UE in the target cell.
  • Step S24 The UE determines the uplink transmit power of the UE in the target cell according to the uplink transmit power prompt information.
  • Step S25 The UE sends uplink data to the target cell according to the determined uplink transmit power of the UL-grant and the TA of the target cell.
  • the UE After the UE determines the UL-grant, the TA, and the uplink transmit power of the target cell, the UE monitors the downlink synchronization signal of the target cell, and after performing downlink synchronization with the target cell, sends uplink data to the target cell.
  • the UE determines the amount of data that can be transmitted according to the UL-grant of the target cell, and transmits one or more of a handover complete message, a buffer status report, and service data to the target cell according to the size of the transmittable data volume.
  • the UE obtains the UL-grant, the TA, and the uplink transmit power of the target cell from the handover command of the source cell, and determines the UL-grant, the TA, and the uplink transmit power of the target cell according to the corresponding prompt information.
  • the foregoing information is obtained by the random access process of the target cell, thereby eliminating the random access process, shortening the data transmission interruption time of the UE side during the cell handover process, reducing the data transmission delay, and improving the user experience.
  • FIG. 4 is a flowchart of a method for switching a three-cell according to an embodiment of the present invention, and an execution body of the method For the UE, the main processing steps include:
  • Step S31 The UE sends a neighboring area measurement report to the source cell.
  • FIG. 5 is a signaling flowchart of a UE acquiring a target cell TA. It can be seen from the figure that the step of acquiring a target cell TA by the UE includes:
  • the UE completes the neighbor cell measurement according to the configuration of the source cell, and sends an RRC Measurement report to the source cell.
  • the source cell determines whether the UE needs to perform cell handover according to the neighboring cell measurement report sent by the UE. If it is determined that cell handover is required, the source cell sends a cell handover request (Handover request) to the target cell, where, optionally, The cell handover request carries the target cell TA request information (TA request). It can be understood that if the source cell and the target cell belong to the same base station, the process is implemented internally by the base station, and the invention is not limited.
  • the target cell determines whether there is sufficient communication resource allocated to the UE according to the received cell handover request, and if yes, sends a cell handover confirm message (Handover confirm) to the source cell, where, optionally, the cell handover confirmation is performed.
  • the message carries the TA (TA value) of the target cell.
  • the target cell may further carry the information about the target cell UL-grant in the cell handover confirmation message sent to the source cell.
  • Whether the target cell carries the TA and/or the UL-grant prompt information of the target cell in the cell handover confirmation message may be triggered by the target cell, or may be triggered by the related request information carried in the cell handover request message, for example, the target cell according to the cell handover request
  • the target cell TA request information carried in the information carries the TA of the target cell in the cell handover confirmation message.
  • the cell acknowledgement message sent by the target cell to the source cell may carry the TA prompt information of the target cell and the UL-grant prompt information of the target cell.
  • the cell acknowledgement message sent by the target cell to the source cell may carry the TA prompt information of the target cell and the UL-grant prompt information of the target cell.
  • the source cell generates a handover command according to the handover confirmation message, and carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information of the target cell in the handover command.
  • the source cell sends a cell handover command to the UE, where the cell handover command is carried in the radio resource reconfiguration message (RRC reconfiguration) sent by the source cell to the UE.
  • RRC reconfiguration radio resource reconfiguration message
  • Step S32 The UE receives the handover command sent by the source cell, where the handover command carries the TA prompt information, the UL-grant prompt information of the UE in the target cell, and the uplink transmit power prompt information in the target cell.
  • the UE after receiving the handover command sent by the source cell, the UE sends a hybrid automatic repeat request acknowledgement message (HARQ Ack) to the source cell according to step (5) in FIG. 5 .
  • HARQ Ack hybrid automatic repeat request acknowledgement message
  • the information carried in the handover command is determined according to the information carried in the handover confirmation message sent by the target cell to the source cell, for example, the UL Grant prompt information or the UL Grant prompt information and the TA prompt information may be carried. , etc., the invention is not limited.
  • Step S33 The UE determines, according to the handover command, the TA, the UL-grant, and the uplink transmit power of the UE in the target cell.
  • the UE can determine the TA of the target cell according to the information carried in the handover command.
  • the TA prompt information is the TA of the target cell.
  • the uplink transmit power prompt information carried in the handover command may be implemented in multiple manners.
  • the uplink transmit power prompt information may be the uplink transmit power used by the UE in the target cell, and the uplink transmit power used by the UE in the source cell is used as The uplink transmit power used in the target cell.
  • the uplink transmit power prompt information is offset information that is offset based on the uplink transmit power of the source cell.
  • the UE performs offset according to the offset information on the basis of the transmit power of the source cell to determine the target. Uplink transmit power in the cell.
  • the uplink transmit power prompt information is fourth indication information indicating that the UE determines the uplink transmit power of the UE in the target cell according to the downlink signal transmit power and the downlink signal receive power of the target cell.
  • the method for the UE to determine the uplink transmit power in the target cell is as follows:
  • the UE receives the cell broadcast message of the target cell according to the fourth indication information, where the cell broadcast message carries the downlink signal transmission power of the target cell.
  • the UE determines the downlink signal received power according to the received cell broadcast message.
  • the UE determines the downlink path loss value of the target cell according to the downlink signal transmission power and the downlink signal reception power.
  • the UE according to the downlink path loss value and the preset received power of the target cell, The uplink transmit power of the UE in the target cell is determined.
  • the UL-grant prompt information of the same target cell may also be implemented in multiple manners.
  • the UL-grant prompt information includes the UL-grant of the target cell and the UL-grant effective time information, thereby enabling the UE to directly determine the UL of the target cell. -grant and UL-grant effective time.
  • the UL-grant prompt information of the target cell may further include PDCCH monitoring indication information used to indicate that the UE monitors a target downlink PDCCH (Physical Downlink Control Channel).
  • PDCCH monitoring indication information used to indicate that the UE monitors a target downlink PDCCH (Physical Downlink Control Channel).
  • the step of determining, by the UE according to the UL-grant prompt information, the UL-grant of the target cell includes:
  • the UE monitors the PDCCH according to the PDCCH monitoring indication information
  • the UE determines the UL-grant of the target cell according to the DCI (Downlink Control Information) transmitted on the monitored PDCCH.
  • DCI Downlink Control Information
  • Step S34 The UE sends a handover complete message to the target cell according to the determined uplink transmit power of the UL-grant and the TA of the target cell, where the step is step (6) in FIG.
  • the UE obtains the TA used by the target cell, the UL-grant of the target cell, and the uplink transmit power prompt information according to the handover command, and determines the uplink transmit power of the UE in the target cell, from the handover command sent by the source cell, and saves the uplink transmit power of the UE in the target cell.
  • the random access process shortens the data transmission interruption time during cell handover.
  • FIG. 6 is a flowchart of a first manner in which a UE acquires a UL-grant of a target cell, including:
  • the handover acknowledgement message sent by the target cell to the source cell carries the UL-Grant prompt information of the target cell, and the UL-Grant prompt information may include the UL Grant of the target cell.
  • the content included in the UL Grant includes physical resources, such as a physical resource block (PRB), a modulation and coding scheme, and a redundancy version.
  • PRB physical resource block
  • the UL-Grant prompt information may further include period information, where the period information is used to indicate the period of the foregoing UL Grant, and when the period is configured to be 1 ms or 1 subframe or 1 TTI, the UE indicates that the UE is in every MS.
  • the UL Grant can be used for each subframe or every TTI. If the period is configured as 2ms or 2 subframes or 2 TTIs, it means that the UE can use the UL Grant every 2ms or every 2 subframes or every 2 TTIs.
  • the UL-Grant prompt information may further include offset information, where the offset information is used to indicate a moment of the UL Grant, such as at which time the UL Grant can be used. For example, if the offset information is 1 and the period is 2 ms, it means that the UL Grant can be used in subframe 1, subframe 3, and subframe 5.
  • the specific calculation formula is as follows:
  • the UL-Grant prompt information may further include the UL Grant effective time information, where the UL Grant effective time information is used to indicate that the UL Grant is valid after the T1 time is delayed after the UE receives the handover command, or is used to indicate the The UL Grant takes effect after the target cell sends a handover confirmation message to the source cell. For example, after the target cell allocates the UL-Grant, considering the subsequent processing delay, the UL-Grant may be in effect after the time T2 of the completion of the handover confirmation message transmission.
  • the UL-Grant prompt information may further include UL Grant duration information, where the UL Grant duration is used to indicate the valid duration or the effective number of transmissions of the UL grant, and the effective duration is 10 frames or the effective number of times is 10 times, that is, UL-Grant expires after 10 consecutive frames from the first valid frame or expires after 10 consecutive subframes from the first valid subframe; or is used to indicate that the UL grant is valid before time T3
  • the T3 time is the time when the handover complete command is sent, or the time when the UE confirms that the handover complete command is successfully transmitted, or T3 is the time when the radio frame number is 10 and the subframe number is 3.
  • the source cell sends the UL-Grant prompt information to the UE by using a handover command message.
  • the UE After receiving the handover command message, the UE determines, according to one or more of the UL-Grant prompt information or the UL Grant, the period information, the offset information, the effective time information, and the duration information of the target cell.
  • the UL Grant used by the target cell, and the cache status report is sent according to the UL Grant, and at least one of the handover completion message and the service data is switched.
  • the time for the UE to wait for the uplink resource can be minimized, and the resource for transmitting the handover complete message can be obtained more quickly.
  • the time-frequency resource is configured by SPS (Semi-Persistent-Scheduling), and the validity period of the SPS configuration is given.
  • the calculation of the validity period may be based on the BSR (Buffer State Report) of the UE before the source cell sends the signal to the target cell. Status report), specific steps include:
  • the UE completes the neighbor cell measurement according to the configuration of the source cell, and sends a neighbor cell measurement report to the source cell. (RRC Measurement report).
  • the source cell determines whether the UE needs to perform cell handover according to the neighboring cell measurement report sent by the UE. If it is determined that cell handover is required, the source cell sends a cell handover request (Handover request) to the target cell, where, optionally, the handover is performed.
  • the request message may carry the UL-Grant request flag and the BSR information that the UE last reported, indicating that the target cell can be instructed to use the UL-Grant information for fast handover, and the BSR information helps the target cell to allocate uplink communication resources suitable for the UE.
  • the target cell determines, according to the received cell handover request, whether sufficient communication resources are allocated to the UE, and if so, sends a cell handover confirm message to the source cell.
  • the handover acknowledgement message carries the UL-Grant and scheduling time information of the target cell.
  • a set of scheduling moment combinations and a configured effective duration or a valid transmission number are given, for example, indicating that the UL-Grant is valid in the subframe 2 and the subframe 7 in each frame, and the effective duration is 10 frames or the effective number of times. It is 10 times, that is, after 10 consecutive frames from the first valid frame, the UL-Grant expires or expires after 10 consecutive subframes from the first valid subframe.
  • the source base station After obtaining the UL-Grant and SPS scheduling time information of the target cell, the source base station sends the information to the UE through the handover command.
  • the UE sends a hybrid automatic repeat request ACK message to the source cell, and disconnects from the source cell.
  • the UE After completing the downlink synchronization of the target cell, the UE sends a handover complete message according to the SPS scheduling time and the UL-Grant information, and does not send the completed uplink data before transmitting on the subsequent possible SPS scheduling resources.
  • the target cell detects whether there is uplink data arrival of the handover UE on the UL-Grant resource of the SPS time allocated by the corresponding cell, and starts the SPS validity period if the data arrives, and the stop time of the SPS resource allocation is determined by the target cell according to the UE service type and to be transmitted. The amount of data is determined.
  • the UL-Grant in the semi-persistent scheduling mode can minimize the time that the UE waits for uplink resources, and obtain the resources for transmitting the handover complete message more quickly.
  • FIG. 7 shows a second mode flow diagram of a UE acquiring a UL-grant of a target cell.
  • the handover confirmation message sent by the target cell to the source cell carries the UL-Grant prompt information of the target cell, where the UL prompt information includes information indicating that the UE listens to the target cell PDCCH.
  • the UL-Grant prompt information may further include period information, the week The period information is used to indicate the period in which the UE listens to the target cell PDCCH. If the period is configured to be 1 ms or 1 subframe or 1 TTI, the UE indicates that the UE listens to the PDCCH of the target cell every ms or every subframe or every TTI. If the period is configured to be 2 ms or 2 subframes or 2 TTIs, it indicates that the UE monitors the target cell PDCCH every 2 ms or every 2 subframes or every 2 TTIs.
  • the UL-Grant prompt information may further include an offset information, where the offset information is used to indicate a time when the UE listens to the target cell PDCCH, such as, at which time, the UE can monitor the target cell PDCCH. For example, if the offset information is 1 and the period is 2 ms, it means that the target cell PDCCH is monitored on subframe 1, subframe 3, and subframe 5.
  • the specific calculation formula is as follows:
  • the UL-Grant prompt information may further include: the UE monitors the target cell PDCCH effective time information, where the UE monitoring target cell PDCCH effective time information is used to indicate that the UE monitors the target cell PDCCH after the UE receives the handover command.
  • the time T1 is valid, or is used to indicate that the UE monitors the target cell PDCCH, and the T2 time takes effect after the target cell sends a handover confirmation message to the source cell.
  • the UL-Grant prompt information may further include a UE monitoring target cell PDCCH duration information, where the UE listening target cell PDCCH duration is used to indicate that the UE monitors the effective time of the target cell PDCCH or the effective transmission times.
  • the effective duration is 10 frames or the effective number is 10 times, that is, the UE intercepts the target cell PDCCH after 10 consecutive frames from the first valid frame or fails after 10 consecutive subframes from the first valid subframe; or It is used to indicate that the UE monitors the target cell PDCCH before the time T3, for example, the T3 time is the handover completion command transmission time, or the time when the UE confirms that the handover completion command is successfully sent, or the T3 is the radio frame number is 10, and the subframe number is 3 is valid before the moment.
  • the ULGrant prompt information may further include a Radio Network Temporary Identifier (RNTI), such as a C-RNTI or an SPS-RNTI, used by the UE to monitor the target cell PDCCH.
  • RNTI Radio Network Temporary Identifier
  • the source cell sends the UL-Grant prompt information to the UE by using a handover command message.
  • the UE After receiving the handover command message, the UE intercepts the UL-Grant prompt information or one or more of the UL Grant, the period information, the offset information, the effective time information, and the duration information of the target cell, and the monitoring target The PDCCH of the cell, and determining the UL Grant according to the DCI transmitted by the PDCCH, and sending a buffer status report according to the UL Grant, the handover completion message and the number of services According to at least one of them.
  • the time for the UE to wait for the uplink resource can be minimized, and the resource for transmitting the handover complete message can be obtained more quickly.
  • the SPS information of the target cell PDCCH is indicated in the handover message of the source cell, and the UE detects the PDCCH in the target cell according to the indication, and completes the sending of the handover complete message according to the UL-Grant information in the DCI.
  • the specific steps include:
  • the UE completes the neighbor cell measurement according to the configuration of the source cell, and sends an RRC Measurement report to the source cell.
  • the source cell determines whether the UE needs to perform cell handover according to the neighboring cell measurement report sent by the UE. If it is determined that cell handover is required, the source cell sends a cell handover request (Handover request) to the target cell, where the handover request message may be Carrying the PDCCH request flag and the BSR information reported by the UE last time indicates that the target eNB is required to indicate that the PDCCH information is used for fast handover, and the BSR information helps the target cell to allocate uplink communication resources suitable for the UE.
  • a cell handover request may be Carrying the PDCCH request flag and the BSR information reported by the UE last time indicates that the target eNB is required to indicate that the PDCCH information is used for fast handover, and the BSR information helps the target cell to allocate uplink communication resources suitable for the UE.
  • the target cell determines, according to the received cell handover request, whether sufficient communication resources are allocated to the UE, and if so, sends a cell handover confirm message to the source cell.
  • the handover confirmation message carries scheduling time information of the target cell PDCCH.
  • the target cell considers the subsequent processing delay of the handover confirmation message, and may indicate that the PDCCH is valid after a period of time T after the handover confirmation command is sent.
  • the handover related message may be retransmitted.
  • the time T may be set longer, which may prolong the data interruption time. Therefore, another possible resource allocation mode is a semi-static scheduling mode, that is, a set of scheduling moment combinations is given.
  • the validity period indication similar to the method one, for example, detecting the PDCCH on the subframe 2 and the subframe 7 in each frame, the validity period is 10 frames or valid 10 times.
  • the source base station After obtaining the SPS scheduling time information of the PDCCH, the source base station sends the information to the UE through the handover command.
  • the UE sends a hybrid automatic repeat request ACK message to the source cell, and disconnects from the source cell.
  • the UE After completing the downlink synchronization of the target cell, the UE detects the PDCCH according to the SPS scheduling time information, and obtains the UL-Grant from the DCI information in the PDCCH, which is indicated by the UL-Grant. A handover complete message is sent on the resource, and the PDCCH is continuously detected on subsequent possible PDCCH SPS resources.
  • the target cell detects whether there is uplink data arrival of the handover UE on the UL-Grant resource indicated by the PDCCH allocated by the corresponding cell, and starts the SPS validity period if the data arrives, and the stop time of the SPS resource allocation is determined by the target cell according to the UE service type and The amount of data to be transmitted is determined.
  • the target cell does not need to indicate the UL-Grant in the handover confirmation command, that is, the specific uplink resource does not need to be allocated in advance, and the handover command sent by the source cell is acknowledged by the UE, and is notified by the source cell.
  • the target cell handover command is sent, the target cell allocates UL-Grant resources according to the current scheduling situation, which has greater flexibility in resource utilization.
  • the target cell detects whether there is an uplink signal sent by the UE on the time-frequency resource corresponding to the UL-Grant information.
  • the target cell may determine whether there is data transmitted by the UE by detecting an DMRS (De Modulation Reference Signal). If the DMRS is detected, the UE transmits data. If the DMRS is not detected, the UE does not send data.
  • DMRS De Modulation Reference Signal
  • the UE does not send data on the time-frequency resource indicated by the UL-Grant. There are two possible reasons. One is that the UE does not successfully detect the PDCCH information, and the other may be that although the UE successfully obtains the UL-Grant information, the UE There is no data to send (or the data is not ready yet).
  • a method for identifying a reason why the UE does not send data on the UL-Grant indicating time-frequency resource (one of the above two reasons) is provided. That is, when the UE receives the UL-Grant information in the PDCCH and there is no data to be transmitted, the UE may not send padding on the PUSCH (Physical Uplink Shared Channel) but pass the PUCCH (Physical). Uplink Control CHannel, physical uplink control channel) channel feedback ACK (Acknowledgement) information, or use the pre-configured cyclic shift value to transmit pilots on the time-frequency resources indicated by UL-Grant, as follows:
  • the target cell determines whether the UE sends data by detecting whether the uplink DMRS signal exists.
  • the 3-bit information is included in the UL-Grant information to indicate the cyclic shift value used by the DMRS (the range is 0-7).
  • the 3-bit information used to indicate the cyclic shift value used by the DMRS in the SPS activation command is All 0s, representing the cyclic shift used by the DMRS is 0.
  • the target cell detects the DMRS signal in the pilot detection window corresponding to the cyclic shift value, and determines that the user has sent the uplink signal if the signal energy exceeds a certain threshold, and if it is below a certain threshold, The UE did not send data.
  • the specific process is: when the UE receives the UL-Grant information indicated by the PDCCH, if there is no data to be sent at this time, the UE may use one of the following two methods to feed back the cell information, so that the cell confirms that the PDCCH is successfully received.
  • Method 1 The UE feeds back ACK information to the target cell on the PUCCH channel.
  • the UE receives the downlink data transmitted by the target cell on the PDSCH channel of the subframe n, it needs to feed back ACK/NACK (Nacknowledge) information to the target cell in the PUCCH channel of the subframe n+4.
  • the used PUCCH resource index has a one-to-one correspondence with the CCE (Control Channel Element) index indicating the PDCCH information of the PDSCH (Physical Downlink Shared Channel).
  • the present embodiment extends the manner of the feedback ACK/NACK to the uplink transmission, that is, when the PDCCH is used to indicate the UL-Grant of the uplink transmission, An ACK is sent on the PUCCH resource, indicating to the cell that the UE normally receives the PDCCH indication, but there is no data to be transmitted at this time. If the cell does not detect the corresponding DMRS on the uplink resource corresponding to the ULGrant indicated by the PDCCH, and the ACK is not detected on the corresponding PUCCH resource, it is determined that the UE does not successfully detect the PDCCH, and vice versa, it is determined that the UE successfully detects the PDCCH.
  • Method 2 The UE sends a DMRS pilot signal on a time-frequency resource indicated by the UL-Grant, and the DMRS pilot signal uses a pre-configured cyclic shift value, where the pre-configured cyclic shift value is sent when the user sends data.
  • the loop values used are different.
  • two symbols in one subframe are used to transmit the DMRS, and the 3-bit information is carried in the UL-Grant to indicate the cyclic shift used by the DMRS.
  • the UE sends different DMRS pilot codes corresponding to cyclic shifts on the same DMRS time-frequency resource, and the target cell considers that the UE successfully receives the PDCCH but detects the DMRS in the corresponding DMRS detection window. There is no data at this time; if not detected, it is judged that the UE has not successfully detected the PDCCH.
  • the above two methods of judging, which one is specifically selected, may be configured by RRC signaling configuration or UL-Grant information.
  • the pre-configured loop value may be configured by a target cell configuration (configured in RRC signaling configuration or UL-Grant information), or configured with an offset value, and finally used.
  • the cyclic shift value used for feedback is added to the original cyclic shift value and the offset value. Then take the modulo 8 to get. If configured in the UL Grant, it may be necessary to add new bit information to indicate the DMRS cyclic shift value used when there is no data.
  • the UE When the UE receives the UL-Grant information indicated by the PDCCH, if there is no data to be sent, the UE feeds back to the cell according to one of the above methods, and then does not need to detect the ACK/NACK information of the PHICH channel feedback; After the UL-Grant information is sent, the DMRS information is not detected, but the feedback information of one of the above two methods is detected, and the ACK/NACK information is not required to be fed back on the PHICH channel.
  • the method described above is not limited to being applied only in the handover scenario, and may be extended to all scenarios in which the PDCCH indicates UL-Grant.
  • the PDCCH indicates UL-Grant.
  • the above method may be used to notify the cell that the PDCCH is successfully received, which is not limited in the present invention.
  • the present invention provides another method to improve resource utilization.
  • the base station allocates the same UL Grant to two or more UEs, where different UEs use different DMRSs to send respective data.
  • the different DMRSs may be indicated by an RRC message or a UL Grant, and the specific method is as shown in the foregoing embodiment.
  • the base station may allocate a special UL Grant to the corresponding UE according to the detected DMRS. Instructing the UE to perform adaptive retransmission; or feeding back a NACK on the PHICH channel, indicating that the UE indicates non-adaptive retransmission. At this time, the base station can only instruct one UE to perform non-adaptive retransmission at most, so as to avoid collision again during retransmission.
  • multiple UEs can share the same uplink resource and improve resource utilization.
  • collisions during retransmission can be avoided, and data transmission delay can be reduced.
  • the embodiment of the present invention provides a method for identifying a reason why a UE does not send data on a time-frequency resource indicated by a UL-Grant.
  • the downlink may be downlink.
  • the channel conditions are poor, and the cell needs to take measures to improve the detection performance of the downlink PDCCH and ensure that the handover process is successfully completed. If it is determined that the UE has not yet transmitted data, no special operation is required.
  • the UE does not send data when there is no data to be transmitted, and can reduce the method for transmitting the meaningless random number. Small interval interference and reduce UE power consumption.
  • FIG. 8 is a flowchart of a method for a four-cell handover according to an embodiment of the present invention. The method is performed by a UE, including:
  • Step S41 The UE sends a neighboring area measurement report to the source cell.
  • the UE completes the neighbor cell measurement according to the configuration of the source cell, and sends a neighbor cell measurement report to the source cell.
  • the source cell determines whether the UE needs to perform cell handover according to the neighbor cell measurement report sent by the UE. If it is determined that cell handover is required, the source cell sends a cell handover request to the target cell.
  • the target cell determines, according to the received cell handover request, whether sufficient communication resources are allocated to the UE, and if yes, sends a cell handover confirmation message to the source cell.
  • the handover confirmation message carries the UL-grant prompt information.
  • the handover request message sent by the source cell to the target cell carries the target cell UL-grant request information.
  • the target cell determines the prompt information of the UE in the target cell according to the actual communication scenario with the source cell, and sends the TA prompt information to the UE by using the source cell.
  • the specific determining method includes: determining, by the target cell, whether the source cell and the target cell are in a coordinated multi-point transmission COMP communication scenario; if yes, the target cell determines that the TA prompt information is that the TA of the target cell is the same as the TA of the source cell. An indication message.
  • the target cell further determines the uplink transmit power of the UE in the target cell according to the communication requirement of the UE, and generates uplink transmit power prompt information according to the determined result, for example, the target cell uses the uplink transmit used by the UE in the source cell. The power is taken as the transmit power of the UE in the target cell.
  • the source cell generates a handover command according to the handover confirmation message sent by the target cell, and carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information in the target cell in the handover command.
  • the specific method is as described in the previous embodiment, and details are not described herein.
  • Step S42 The UE receives the handover command sent by the source cell, where the handover command carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information in the target cell.
  • Step S43 The UE determines, according to the handover command, the TA, the UL-grant, and the uplink transmit power of the UE in the target cell.
  • the UE determines, according to the TA prompt information, the TA of the source cell as the TA of the target cell.
  • the manner in which the UE determines the uplink transmit power used by the UE in the target cell according to the uplink transmit power prompt information is the same as that in the third embodiment, and is not described in this embodiment.
  • the manner in which the UE determines the UL-grant of the target cell according to the UL-grant prompt information, and the implementation process is the same as that in the third embodiment, and is not described in this embodiment.
  • Step S44 The UE sends a handover complete message to the target cell according to the determined uplink transmit power of the UL-grant and the TA of the target cell.
  • the UE acquires the UL-grant of the target cell according to the handover command sent by the source cell, and determines the uplink transmit power of the UE in the target cell by using the TA of the source cell as the TA of the target cell and the uplink transmit power prompt information according to the handover command.
  • the random access process is omitted, and the data transmission interruption time during the cell handover process is shortened.
  • FIG. 9 is a flowchart of a five-cell handover method according to an embodiment of the present invention.
  • the execution subject of the method is a UE, and includes:
  • Step S51 The UE sends a neighboring area measurement report to the source cell.
  • the UE completes the neighbor cell measurement according to the configuration of the source cell, and sends a neighbor cell measurement report to the source cell.
  • the source cell determines whether the UE needs to perform cell handover according to the neighbor cell measurement report sent by the UE. If it is determined that cell handover is required, the source cell sends a cell handover request to the target cell.
  • the target cell determines, according to the received cell handover request, whether sufficient communication resources are allocated to the UE, and if yes, sends a cell handover confirmation message to the source cell.
  • the handover confirmation message carries the UL-grant prompt information.
  • the handover request message sent by the source cell to the target cell carries the target cell UL-grant request information.
  • the target cell will indicate that the second indication information of the TA of the target cell is calculated according to the TA of the source cell as the TA prompt information of the target cell.
  • the TA prompt information of the target cell may further include downlink signal sending time information.
  • the downlink signal sending time information may indicate a downlink signal sending time of the source cell and a downlink signal sending time of the target cell, where Alternatively, the downlink signal sending time information may indicate a difference between a downlink signal sending time of the source cell and a downlink signal sending time of the target cell, or the downlink signal sending time information may indicate a downlink signal sending time and target of the original cell.
  • the downlink signal transmission time of the cell is the same.
  • the downlink signal sending time information of the source cell and the target cell is determined, and the determined manner includes:
  • the downlink signal sending time information is determined to be third indication information indicating that the downlink signal of the source cell and the target cell is a synchronization signal.
  • the source cell may determine the downlink signal transmission time of the source cell and the downlink signal transmission time of the target cell as the downlink signal transmission time information of the source cell and the target cell.
  • the source cell uses the downlink signal transmission time difference between the source cell and the target cell as the downlink signal transmission time information of the source cell and the target cell.
  • the source cell further determines the uplink transmit power of the UE in the target cell according to the communication requirement of the UE, and generates uplink transmit power prompt information according to the determined result, for example, the source cell uses the uplink transmit power used by the UE in the source cell as The transmit power of the UE in the target cell.
  • the source cell generates a handover command, and carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information in the target cell in the handover command.
  • Step S52 The UE receives the handover command sent by the source cell, where the handover command carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information in the target cell.
  • Step S53 The UE calculates the TA of the target cell according to the TA prompt information in the handover command.
  • the method for the UE to calculate the TA of the target cell includes:
  • the UE determines, according to the downlink signal transmission time information, that the downlink signal of the source cell and the target cell is synchronized:
  • the UE detects, according to the second indication information, a downlink signal arrival time of the source cell and the target cell, respectively.
  • the UE determines a downlink synchronization delay difference between the source cell and the target cell according to the source cell downlink signal arrival time (SeNB downlink timing) and the target cell source cell downlink signal arrival time (TeNB downlink timing);
  • the UE determines the TA used by the UE in the target cell according to the downlink synchronization delay difference and the TA of the source cell.
  • TeNB TA SeNB downlink+–(SeNB downlink timing)
  • the TA of the target eNB (TeNB TA) is equal to the TA of the source SeNB detected by the UE side.
  • the sum of the two eNB downlink synchronization delay differences is two times, where the TeNB downlink timing is the TeNB downlink signal arrival time detected by the UE, and the SeNB downlink timing is the SeNB downlink signal arrival time detected by the UE.
  • the above formula defaults that the downlink transmission times of the source eNB and the destination eNB are the same, that is, the two eNBs are synchronized.
  • the source cell may notify the UE of the synchronization delay difference between the two eNBs to assist the TA calculation. Then the calculation formula of the target eNB TA is corrected to:
  • TeNB TA SeNB downlink timing - (TeNB transmitting timing - SeNB transmitting timing)
  • the TeNB transmitting timing is the downlink transmission time of the TeNB
  • the SeNB transmitting timing is the downlink transmission time of the SeNB
  • the (TeNB receiving timing-SeNB transmitting timing) is the transmission time synchronization delay difference between the two cells.
  • the source cell may The two values are respectively sent to the UE, and the difference between the two data may also be sent to the UE.
  • the source eNB corresponds to the source cell
  • the target eNB corresponds to the target cell.
  • the base station of the target cell and the base station of the source cell are different bases.
  • the target cell is the same as the base station of the source cell, It can be calculated analogously to the above formula.
  • Step S54 The UE determines the UL-grant of the target cell and the uplink transmit power of the UE in the target cell according to the UL-grant prompt information and the uplink transmit power prompt information in the handover command, respectively.
  • the manner in which the UE determines the uplink transmit power used by the UE in the target cell according to the uplink transmit power prompt information is the same as that in the third embodiment, and is not described in this embodiment.
  • the manner in which the UE determines the UL-grant of the target cell according to the UL-grant prompt information, and the implementation process is the same as that in the third embodiment, and is not described in this embodiment.
  • Step S55 The UE sends a handover complete message to the target cell according to the determined uplink transmit power of the UL-grant and the TA of the target cell.
  • the UE obtains the UL-grant of the target cell from the handover command sent by the source cell, and the UE calculates the TA of the target cell according to the TA prompt information, and determines the UE in the target cell according to the uplink transmit power prompt information of the handover command.
  • the uplink transmit power eliminates the random access process and shortens the data transmission interruption time during the cell handover process.
  • FIG. 10 is a flowchart of a six-cell handover method according to an embodiment of the present invention, and an execution body of the method For the source cell, the main steps include:
  • Step S61 The source cell acquires an uplink scheduling resource indication UL-grant prompt information of the target cell.
  • Step S62 The source cell sends a handover command to the user equipment UE, where the handover command carries the UL-grant prompt information.
  • the UL-grant prompt information is used by the UE to determine the UL-grant of the target cell, and the UE sends the uplink data to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • FIG. 11 is a flowchart of a method for handover of a cell according to a seventh embodiment of the present invention.
  • the main body of the method is a source cell, and the main steps include:
  • Step S71 The source cell acquires UL-grant prompt information, TA prompt information, and uplink transmit power prompt information of the target cell.
  • the UE In order to enable the UE to complete the cell handover procedure, the UE needs to further acquire the TA used by the UE in the target cell and the uplink transmit power of the UE to send data to the target cell.
  • the information about the TA, the UL-grant, and the uplink transmit power required by the UE in this embodiment is obtained by the source cell and sent to the UE.
  • the TA and/or the uplink transmit power prompt information of the target cell may be set by the UE in advance, without the source cell acquiring.
  • Step S72 The source cell sends a handover command to the target cell, where the handover command carries the UL-grant prompt information, the TA prompt information, and the uplink transmit power prompt information.
  • the UL-grant prompt information sent by the source cell to the UE is used by the UE to determine the UL-grant of the target cell according to the UL-grant prompt information; the TA prompt information is used by the UE to determine the TA used by the UE in the target cell; and the uplink transmit power prompt information is used.
  • the UE determines the uplink transmit power of the UE in the target cell.
  • FIG. 12 is a flowchart of an eight-cell handover method according to an embodiment of the present invention.
  • the main body of the method is a source cell, and the main steps include:
  • Step S81 The source cell receives the neighbor cell measurement report sent by the UE.
  • Step S82 When the source cell determines to perform cell handover, the cell handover request message is sent to the target cell.
  • the cell handover request message sent by the source cell to the target cell carries the UL-grant request information and the target cell TA request information.
  • Step S83 The source cell receives the handover confirmation message sent by the target cell, and the handover confirmation message carries the UL-grant prompt information and the TA of the target cell.
  • the UL-grant prompt information can be implemented in two ways:
  • the UL-grant prompt information includes the UL-grant of the target cell and the UL-grant effective time information.
  • the UL-grant effective time information includes at least one of the following information: a fifth indication information used to indicate that the UL-grant is valid after the preset time after the UE receives the handover command; an effective duration or a valid number of the UL-grant; UL- The effective time of the grant.
  • the UL-grant hint information includes PDCCH monitoring indication information for instructing the UE to monitor the physical downlink control channel PDCCH of the target cell, and is configured to monitor the PDCCH according to the PDCCH monitoring indication information, and the UE transmits the downlink according to the monitored PDCCH.
  • the control information DCI determines the UL-grant of the target cell.
  • the PDCCH monitoring indication information includes: the monitoring effective time information of the PDCCH, and is used by the UE to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring valid time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • Step S84 The source cell acquires uplink transmit power prompt information of the target cell.
  • the source cell acquires uplink transmit power prompt information of the UE in the target cell, and is used by the UE to determine, according to the uplink transmit power prompt information, the uplink transmit power of the UE in the target cell.
  • the uplink transmit power prompt information may be an uplink transmit power used by the UE set in advance by the source cell in the target cell;
  • the uplink transmit power prompt information is offset information that is preset in the source cell and is offset based on the uplink transmit power of the source cell;
  • the uplink transmit power prompt information is a fourth indication information that the source cell indicates that the UE determines the uplink transmit power of the UE in the target cell according to the downlink signal transmit power and the downlink signal receive power of the target cell, and is used by the UE to receive the target cell according to the fourth indication information.
  • the cell broadcast message the cell broadcast message carries the downlink signal transmission power of the target cell; the UE determines the downlink signal reception power according to the received cell broadcast message; the UE determines the downlink path of the target cell according to the downlink signal transmission power and the downlink signal reception power.
  • the loss value the UE determines the uplink transmit power of the UE in the target cell according to the downlink path loss value and the preset received power of the target cell.
  • Step S85 The source cell sends a handover command to the target cell, where the handover command carries the TA of the target cell, the UL-grant prompt information, and the uplink transmit power prompt information.
  • the TA prompt information is the TA of the target cell.
  • the UL-grant prompt information sent by the source cell to the UE is used by the UE to determine the UL-grant of the target cell according to the UL-grant prompt information;
  • the TA prompt information is used by the UE to determine the TA used by the UE in the target cell;
  • the transmit power hint information is used by the UE to determine the uplink transmit power of the UE in the target cell.
  • the method of this embodiment enables the UE to obtain, from the handover command sent by the source cell, the TA used by the target cell, the UL-grant of the target cell, and the uplink transmit power prompt information according to the handover command to determine the uplink transmit power of the UE in the target cell.
  • the random access process is omitted, and the data transmission interruption time during the cell handover process is shortened.
  • FIG. 13 is a flowchart of a method for handover of a cell according to an embodiment of the present invention.
  • the main body of the method is a source cell, and the main steps include:
  • Step S91 The source cell receives the neighbor cell measurement report sent by the UE.
  • Step S92 When the source cell determines to perform cell handover, the cell handover request message is sent to the target cell.
  • the handover request message sent by the source cell to the target cell further carries the target cell downlink signal sending time request information and the UL-grant request information.
  • Step S93 The source cell receives the handover confirmation message sent by the target cell, where the handover confirmation message carries the UL-grant prompt information and the downlink signal transmission time of the target cell.
  • the UL-grant prompt information obtained by the source cell in this embodiment is the same as that in the eighth embodiment, and details are not described herein again.
  • Step S94 The source cell generates a TA of the target cell according to the downlink signal sending time of the target cell. Prompt message.
  • the method for generating the TA prompt information by the source cell includes:
  • the source cell determines downlink signal transmission time information of the source cell and the target cell according to the downlink signal transmission time of the target cell and the downlink signal transmission time of the source cell;
  • the source cell determines that the UE has the TA calculation capability, and generates second indication information for instructing the UE to calculate the TA of the target cell according to the TA of the source cell;
  • the source cell generates the TA prompt information, where the TA prompt information includes the TA of the source cell, the second indication information, and the downlink signal transmission time information.
  • Step S95 The source cell acquires uplink transmit power prompt information of the target cell.
  • the manner in which the source cell generates the uplink transmit power prompt information of the target cell in this embodiment is the same as that in the eighth embodiment, and details are not described herein again.
  • Step S96 The source cell sends a handover command to the target cell, where the handover command carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information.
  • the handover command further carries the TA prompt information, where the UE detects the downlink signal arrival time of the source cell and the target cell according to the second indication information, and according to the downlink signal arrival time of the source cell and the target cell, and the downlink of the source cell and the target cell.
  • the signal transmission time information determines the downlink synchronization delay difference between the source cell and the target cell, and determines the TA of the target cell according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal transmission time information includes a downlink signal transmission time of the source cell and a downlink signal transmission time of the target cell;
  • the downlink signal transmission time information is a downlink signal transmission time difference between the target cell and the source cell.
  • the handover command further carries the TA prompt information, and is used by the UE to determine, according to the TA prompt information, the TA used by the UE in the target cell.
  • FIG. 14 is a flowchart of a ten cell handover method according to an embodiment of the present invention.
  • the main body of the method is a source cell, and the main steps include:
  • Step S101 The source cell receives the neighbor cell measurement report sent by the UE.
  • Step S102 When the source cell determines to perform cell handover, the cell handover request message is sent to the target cell.
  • the handover request message carries the UL-grant request information.
  • Step S103 The source cell receives the handover confirmation message sent by the target cell, and the handover confirmation message carries the UL-grant prompt information.
  • Step S104 The source cell acquires the TA prompt information of the target cell.
  • the source cell determines that the downlink signal of the target cell is a synchronization signal, and generates third indication information that is used to indicate that the downlink signal of the source cell and the target cell is a synchronization signal, where the third indication information is a downlink signal sending time of the source cell and the target cell. information;
  • the source cell determines the TA calculation capability that the UE has, and generates second indication information that is used to instruct the UE to calculate the TA of the target cell according to the TA of the source cell.
  • the source cell generates the TA prompt information, where the TA prompt information includes the TA of the source cell, the second indication information, and the downlink signal sending time information, and is used by the UE to detect the downlink signal arrival time of the source cell and the target cell according to the second indication information.
  • Determining a downlink synchronization delay difference between the source cell and the target cell according to the downlink signal arrival time of the source cell and the target cell and the downlink signal transmission time information of the source cell and the target cell, according to the downlink synchronization delay difference and the TA of the source cell Determine the TA of the target cell.
  • the source cell obtains the timing advance TA prompt information of the target cell, including: determining whether the source cell and the target cell are in a coordinated multi-point transmission COMP communication scenario; if yes, determining, by the source cell, the TA prompt information as the TA indicating the target cell
  • the first indication information that is the same as the TA of the source cell is used by the UE to use the TA of the source cell as the TA of the target cell according to the first indication information.
  • Step S105 The source cell acquires uplink transmit power prompt information of the target cell.
  • Step S106 The source cell sends a handover command to the target cell, where the handover command carries the TA prompt information, the UL-grant prompt information, and the uplink transmit power prompt information.
  • FIG. 15 is a flowchart of a method for switching a cell according to an eleventh embodiment of the present invention.
  • the main body of the method is:
  • Step S111 The target cell receives a handover request message sent by the source cell.
  • Step S112 The target cell sends a handover confirmation message to the source cell, where the handover confirmation message carries the uplink scheduling resource indication UL-grant prompt message, and the handover confirmation message is used by the source cell to send a handover command to the UE according to the handover confirmation message, and the handover command carries the UL.
  • the handover confirmation message carries the uplink scheduling resource indication UL-grant prompt message
  • the handover confirmation message is used by the source cell to send a handover command to the UE according to the handover confirmation message, and the handover command carries the UL.
  • - grant prompt information the UL-grant prompt information is used by the UE to determine the UL-grant of the target cell
  • the UE sends the uplink data to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and Business data.
  • FIG. 16 is a flowchart of a method for switching a 12-cell according to an embodiment of the present invention.
  • the main body of the method is:
  • Step S121 The handover request message switching request message sent by the target cell receiving source cell carries the UL-grant request information and the target cell TA request information.
  • Step S122 The target cell sends a handover confirmation message to the source cell, and the handover acknowledgement message carries the TA of the target cell and the UL-grant prompt information.
  • the TA of the target cell is used by the source cell to use the TA of the target cell as the TA hint information.
  • the handover confirmation message may not carry the TA of the target cell, but carries the downlink signal transmission time of the target cell, and is used for the downlink signal transmission time of the source cell according to the target cell and the source cell.
  • the downlink signal transmission time determines the downlink signal transmission time information of the source cell and the target cell.
  • the target cell downlink signal transmission time request information may be carried in the handover request message.
  • the UL-grant prompt information includes the UL-grant and UL-grant effective time information of the target cell.
  • a fifth indication information used to indicate that the UL-grant is valid after the preset time after the UE receives the handover command
  • the UL-grant hint information includes PDCCH snoop indication information for instructing the UE to listen to the physical downlink control channel PDCCH of the target cell, and the UE monitors the PDCCH according to the PDCCH snoop indication information, and the UE controls the downlink control according to the monitored PDCCH.
  • the information DCI determines the UL-grant of the target cell.
  • the PDCCH monitoring indication information includes: the monitoring effective time information of the PDCCH, and is used by the UE to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring valid time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • Step S123 The target cell receives the information reported by the UE.
  • the target cell receives the uplink data on the communication resource corresponding to the UL-grant, where the uplink data includes at least one of the following: a handover completion message, a buffer status report, and service data;
  • the target cell detects an acknowledgement ACK message on the communication resource corresponding to the UL-grant, and determines, according to the ACK message, that the UE has detected the PDCCH;
  • the target cell detects the demodulation reference signal DMRS on the communication resource corresponding to the UL-grant;
  • the target cell determines whether the cyclic shift value of the detected DMRS is the same as the first cyclic shift value carried in the UL-grant. If not, it determines that the UE has detected the PDCCH.
  • FIG. 17 is a schematic structural diagram of a cell switching apparatus according to an embodiment of the present invention.
  • the device as a user equipment UE, includes: a receiving module 1701, a UL-grant determining module 1702, and a sending module 1703;
  • the receiving module 1701 is configured to receive a handover command sent by the source cell, where the handover command carries an uplink scheduling resource indication UL-grant prompt information of the target cell;
  • the UL-grant determining module 1702 is configured to determine, according to the UL-grant prompt information, a UL-grant of the target cell;
  • the sending module 1703 is configured to send uplink data to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the apparatus further includes: a TA determining module
  • the switching command also carries a timing advance TA prompt information
  • a TA determining module configured to determine, according to the TA prompt information, a TA used by the UE in the target cell
  • the sending module 1703 is specifically configured to send uplink data to the target cell according to the TA used by the target cell and the UL-grant.
  • the TA prompt information is a TA used by the UE in the target cell
  • the TA prompt information is first indication information indicating that the TA of the target cell is the same as the TA of the source cell;
  • the TA determining module is specifically configured to use, according to the first indication information, the TA used by the UE in the source cell as the TA used in the target cell;
  • the TA prompt information includes a TA of the source cell, second indication information indicating that the TA of the target cell is calculated according to the TA of the source cell, and downlink signal transmission time information of the source cell and the target cell;
  • the TA determining module is specifically configured to detect, according to the second indication information, a downlink signal arrival time of the source cell and the target cell, respectively;
  • the TA used by the UE in the target cell is determined according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal sending time information is at least one of the following:
  • a third indication information indicating that the downlink signal of the source cell and the target cell is a synchronization signal
  • the downlink signal sending time of the source cell and the downlink signal sending time of the target cell are included;
  • the time difference is sent for the downlink signals of the target cell and the source cell.
  • the apparatus further includes: an uplink transmit power determining module;
  • the handover command also carries an uplink transmit power prompt message
  • An uplink transmit power determining module configured to determine, according to the uplink transmit power prompt information, an uplink transmit power of the UE in the target cell;
  • the sending module 1703 is specifically configured to send uplink data to the target cell according to the UL-grant.
  • the uplink transmit power prompt information is an uplink transmit power used by the UE in the target cell
  • the uplink transmit power prompt information is offset information that is offset based on the uplink transmit power of the source cell;
  • the uplink transmit power prompt information is fourth indication information indicating that the UE determines the uplink transmit power of the UE in the target cell according to the downlink signal transmit power and the downlink signal receive power of the target cell;
  • the uplink transmit power determining module is configured to receive the cell broadcast message of the target cell according to the fourth indication information, where the cell broadcast message carries the downlink signal sending power of the target cell, and determines the downlink signal receiving according to the received cell broadcast message. Power; determining a downlink path loss value of the target cell according to the downlink signal transmission power and the downlink signal received power; determining the UE's uplink in the target cell according to the downlink path loss value and the preset received power of the target cell Transmit power.
  • the UL-grant hint information includes UL-grant and UL-grant effective time information of the target cell.
  • the UL-grant effective time information includes at least one of the following information:
  • a fifth indication information used to indicate that the UL-grant is valid after the preset time after the UE receives the handover command
  • the UL-grant hint information includes PDCCH snoop indication information for instructing the UE to listen to the physical downlink control channel PDCCH of the target cell;
  • the UL-grant determining module 1702 is configured to monitor the PDCCH according to the PDCCH monitoring indication information
  • the UL-grant of the target cell is determined according to the downlink control information DCI transmitted on the monitored PDCCH.
  • the PDCCH monitoring indication information includes: monitoring effective time information of the PDCCH;
  • the UL-grant determining module 1702 is specifically configured to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring valid time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the apparatus further includes: a PDCCH detection and confirmation module, configured to determine, according to the downlink control information DCI transmitted on the monitored PDCCH, the UL-grant of the target cell, and before the uplink data is sent, corresponding to the PDCCH
  • the physical uplink control channel PUCCH sends an acknowledgement ACK message to the target cell, where the target cell determines, according to the ACK message, that the UE has listened to the PDCCH;
  • a PDCCH detection confirmation module configured to perform downlink control according to the monitored PDCCH
  • the information DCI after determining the UL-grant of the target cell, sends a demodulation reference signal DMRS to the target cell on the communication resource indicated by the UL-grant, before the uplink data is sent, where the UL-grant carries the UE to send the DMRS.
  • the first cyclic shift value, the cyclic shift value of the DMRS sent by the UE is a second cyclic shift value different from the first cyclic shift value, and is used by the target cell to determine that the UE has listened to the PDCCH according to the DMRS sent by the UE.
  • FIG. 18 is a schematic structural diagram of a second cell switching apparatus according to an embodiment of the present invention.
  • the device is used as a source cell communication terminal, and includes: an information acquiring module 1801 and a switching command sending module 1802;
  • the information obtaining module 1801 is configured to acquire an uplink scheduling resource indication UL-grant prompt information of the target cell.
  • the handover command sending module 1802 is configured to send a handover command to the user equipment UE, where the handover command carries the UL-grant prompt information, where the UL-grant prompt information is used by the UE to determine the UL-grant of the target cell, and the UE according to the UL-grant
  • the target cell sends uplink data, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the information acquiring module 1801 is specifically configured to send a handover request message to the target cell, and receive a handover confirmation message sent by the target cell, where the handover confirmation message carries the UL-grant prompt information.
  • the handover request message carries UL-grant request information.
  • the handover confirmation message further carries the TA of the target cell
  • the information obtaining module 1801 is further configured to use the TA of the target cell as the TA prompt information.
  • the handover command also carries the TA prompt information.
  • the handover request message further carries the target cell TA request information.
  • the handover confirmation message further carries the downlink signal transmission time of the target cell
  • the information acquiring module 1801 is further configured to determine downlink signal sending time information of the source cell and the target cell according to the downlink signal sending time of the target cell and the downlink signal sending time of the source cell;
  • the TA prompt information includes the TA of the source cell, the second indication information, and the downlink signal sending time information
  • the handover command further carries the TA prompt information, and is used by the UE according to the second indication information. Detecting the downlink signal arrival time of the source cell and the target cell respectively, and determining the downlink synchronization delay difference between the source cell and the target cell according to the downlink signal arrival time of the source cell and the target cell and the downlink signal sending time information of the source cell and the target cell, The TA of the target cell is determined according to the downlink synchronization delay difference and the TA of the source cell.
  • the downlink signal sending time information includes a downlink signal sending time of the source cell and a downlink signal sending time of the target cell;
  • the downlink signal transmission time information is a downlink signal transmission time difference between the target cell and the source cell.
  • the handover request message further carries the target cell downlink signal transmission time request information.
  • the information acquiring module 1801 is further configured to acquire the timing advance TA prompt information of the target cell.
  • the handover command further carries the TA prompt information, and is used by the UE to determine, according to the TA prompt information, the TA used by the UE in the target cell.
  • the information acquiring module 1801 is specifically configured to determine that the downlink signal of the target cell is a synchronization signal, and generate third indication information that is used to indicate that the downlink signal of the source cell and the target cell is a synchronization signal, where the third indication is
  • the information is the downlink signal transmission time information of the source cell and the target cell; generating second indication information for instructing the UE to calculate the TA of the target cell according to the TA of the source cell; generating TA prompt information, where the TA prompt information includes the TA of the source cell
  • the second indication information and the downlink signal transmission time information are used by the UE to detect the downlink signal arrival time of the source cell and the target cell according to the second indication information, according to the downlink signal arrival time of the source cell and the target cell, and the source cell and the target.
  • the downlink signal transmission time information of the cell determines the downlink synchronization delay difference between the source cell and the target cell, and determines the TA of the target cell according to the downlink synchronization
  • the information obtaining module 1801 is specifically configured to determine whether the source cell and the target cell are in a coordinated multi-point transmission COMP communication scenario; if yes, determine that the TA prompt information is the TA indicating the target cell and the TA of the source cell.
  • the same first indication information is used by the UE to use the TA of the source cell as the TA of the target cell according to the first indication information.
  • the information acquiring module 1801 is further configured to acquire uplink transmit power prompt information of the UE in the target cell, where the UE determines, according to the uplink transmit power prompt information, that the UE is in the target.
  • the handover command carries the uplink transmit power prompt information.
  • the uplink transmit power prompt information is an uplink transmit power used by the UE set in advance by the source cell in the target cell;
  • the uplink transmit power prompt information is offset information that is preset in the source cell and is offset based on the uplink transmit power of the source cell;
  • the uplink transmit power prompt information is a fourth indication information that the source cell indicates that the UE determines the uplink transmit power of the UE in the target cell according to the downlink signal transmit power and the downlink signal receive power of the target cell, and is used by the UE to receive the target cell according to the fourth indication information.
  • the cell broadcast message the cell broadcast message carries the downlink signal transmission power of the target cell; the UE determines the downlink signal reception power according to the received cell broadcast message; the UE determines the downlink path of the target cell according to the downlink signal transmission power and the downlink signal reception power.
  • the loss value the UE determines the uplink transmit power of the UE in the target cell according to the downlink path loss value and the preset received power of the target cell.
  • the UL-grant hint information includes UL-grant and UL-grant effective time information of the target cell.
  • the UL-grant effective time information includes at least one of the following information:
  • a fifth indication information used to indicate that the UL-grant is valid after the preset time after the UE receives the handover command
  • the UL-grant hint information includes PDCCH monitoring indication information for instructing the UE to listen to the physical downlink control channel PDCCH of the target cell, and is configured to monitor the PDCCH according to the PDCCH monitoring indication information, and the UE is configured according to the monitored PDCCH.
  • the downlink control information DCI of the transmission determines the UL-grant of the target cell.
  • the PDCCH monitoring indication information includes: the monitoring effective time information of the PDCCH, and is used by the UE to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring valid time information of the PDCCH includes at least one of the following:
  • a sixth finger for instructing to start monitoring the PDCCH after a preset time after receiving the handover command Display information
  • the time at which the PDCCH is monitored is monitored.
  • FIG. 19 is a schematic structural diagram of a three-cell switching apparatus according to an embodiment of the present invention.
  • the apparatus is used as a target cell communication terminal, and includes: a receiving module 1901 and a handover confirmation message sending module 1902;
  • the receiving module 1901 is configured to receive a handover request message sent by the source cell.
  • the handover confirmation message sending module 1902 is configured to send a handover confirmation message to the source cell, where the handover confirmation message carries an uplink scheduling resource indication UL-grant prompt message, and the handover confirmation message is used by the source cell to send a handover command to the UE according to the handover confirmation message, and the handover is performed.
  • the command carries the UL-grant prompt information, and the UL-grant prompt information is used by the UE to determine the UL-grant of the target cell; the UE sends the uplink data to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, Cache status reports and business data.
  • the handover request message carries UL-grant request information.
  • the handover confirmation message further carries the TA of the target cell, and is used by the source cell to use the TA of the target cell as the TA prompt information.
  • the handover request message further carries the target cell TA request information.
  • the handover confirmation message further carries the downlink signal transmission time of the target cell, and is used for determining, by the source cell, the downlink signal of the source cell and the target cell according to the downlink signal transmission time of the target cell and the downlink signal transmission time of the source cell. Send time information.
  • the handover request message further carries the target cell downlink signal transmission time request information.
  • the UL-grant hint information includes UL-grant and UL-grant effective time information of the target cell.
  • the UL-grant effective time information includes at least one of the following information:
  • a fifth indication information used to indicate that the UL-grant is valid after the preset time after the UE receives the handover command
  • the UL-grant hint information includes means for instructing the UE to listen to the target cell.
  • the PDCCH monitoring indication information of the physical downlink control channel PDCCH is used for the UE to monitor the PDCCH according to the PDCCH monitoring indication information, and the UE determines the UL-grant of the target cell according to the downlink control information DCI transmitted on the monitored PDCCH.
  • the PDCCH monitoring indication information includes: the monitoring effective time information of the PDCCH, and is used by the UE to monitor the PDCCH according to the monitoring effective time information of the PDCCH.
  • the monitoring valid time information of the PDCCH includes at least one of the following:
  • the time at which the PDCCH is monitored is monitored.
  • the receiving module 1901 is further configured to receive uplink data on a communication resource corresponding to the UL-grant;
  • the receiving module 1901 is further configured to: detect an acknowledgement ACK message on the communication resource corresponding to the UL-grant, and determine, according to the ACK message, that the UE has detected the PDCCH;
  • the receiving module 1901 is further configured to: detect, according to the communication resource corresponding to the UL-grant, the demodulation reference signal DMRS; determine whether the cyclic shift value of the detected DMRS is the same as the first cyclic shift value carried in the UL-grant If it is different, it is determined that the UE has detected the PDCCH.
  • FIG. 20 is a schematic structural diagram of a user terminal device according to an embodiment of the present invention.
  • the user terminal device 2000 includes a communication interface 2001, a memory 2003, and a processor 2002.
  • the communication interface 2001, the processor 2002, the memory 2003, and the bus 2004 are mutually
  • the bus 2004 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 20, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 2001 is configured to communicate with a transmitting end.
  • the memory 2003 is used to store programs.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 2003 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. Device.
  • the processor 2002 executes the program stored in the memory 2003 to implement the method of the foregoing method embodiment of the present invention:
  • the uplink data is sent to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the processor 2002 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP Processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • CPU central processing unit
  • NP Processor network processor
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the terminal device 2100 includes a communication interface 2101, a memory 2103, and a processor 2102.
  • the communication interface 2101, the processor 2102, and the memory 2103 are connected to each other through a bus 2104.
  • the bus 2104 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 21, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 2101 is configured to communicate with a transmitting end.
  • the memory 2103 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 2103 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.
  • the processor 2102 executes the program stored in the memory 2103 to implement the method of the foregoing method embodiment of the present invention:
  • the handover command carries the UL-grant prompt information
  • the UL-grant prompt information is used by the UE to determine the UL-grant of the target cell
  • the UE sends the uplink data to the target cell according to the UL-grant, where the uplink
  • the data includes at least one of the following: a handover completion message, a cache status report, and service data.
  • the processor 2102 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • CPU central processing unit
  • NP processor network processor
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • FIG. 22 is a schematic structural diagram of a terminal device according to Embodiment 2 of the present invention.
  • the terminal device 2200 includes a communication interface 2201, a memory 2203, and a processor 2202.
  • the communication interface 2201, the processor 2202, and the memory 2203 are connected to each other through a bus 2204.
  • the bus 2204 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 22, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 2201 is configured to communicate with a transmitting end.
  • the memory 2203 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 2203 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.
  • the processor 2202 executes the program stored in the memory 2203 to implement the method of the foregoing method embodiment of the present invention:
  • the handover confirmation message carries an uplink scheduling resource indication UL-grant prompt message
  • the handover confirmation message is used by the source cell to send a handover command to the UE according to the handover confirmation message, where the handover command carries the UL-grant prompt information.
  • the UL-grant hint information is used by the UE to determine a UL-grant of the target cell; the UE sends uplink data to the target cell according to the UL-grant, where the uplink data includes at least one of the following: a handover complete message, a cache status report, and service data.
  • the processor 2202 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP Processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • CPU central processing unit
  • NP Processor network processor
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the apparatus and the device in the embodiments of the present invention may perform the methods in the foregoing embodiments, and the device and device embodiments are not described again.
  • the UE acquires uplink transmission resources such as UL-Grant from the source cell, omits the random access procedure, shortens the data transmission interruption time, and reduces the data transmission delay time in the cell handover process.
  • the method, the device, and the terminal of the embodiment of the present invention can be applied to a cell handover scenario of an LTE (Long Term Evolution) system.
  • LTE Long Term Evolution
  • the source cell base station and the target cell base station can communicate with each other through the X2 port communication eNB, and the X2 port or the X2 port cannot be used for the handover process. It can be transited by the MME.
  • the manners of determining the information such as the target cell TA, the UL-Grant, and the uplink transmit power may be combined with each other.
  • the combinations in the foregoing embodiments are only examples to illustrate the technical solution of the present invention. Combinations are not enumerated in the present invention.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明涉及小区切换技术，尤其涉及一种小区切换方法、装置及设备。上述小区切换方法，包括：用户设备UE接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示UL-grant提示信息；所述UE根据所述UL-grant提示信息，确定所述目标小区的UL-grant；所述UE根据所述UL-grant向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。本发明实施例提供的小区切换方法、装置及设备，以降低小区切换过程中的延迟时间。

Description

小区切换方法、装置及设备 技术领域
本发明涉及小区切换技术，尤其涉及一种小区切换方法、装置及设备。
背景技术
无线通信***相对有线通信***而言，优势在于UE(User Equipment，用户设备)可以自由移动。在蜂窝通信***中UE的移动会导致服务小区的改变，这一过程被称为小区切换过程。
图1示出了现有技术小区切换过程的流程图。图1中，以LTE(Long Term Evolution，长期演进)***，源小区与目标小区分别对应不同基站的应用场景为例进行说明，切换步骤包括：
A、UE根据源eNB的配置完成邻区测量并向源eNB反馈测量报告(Measurement reort)，由源eNB根据邻区和本小区的信号强度判断是否需要进行切换，如果需要切换则执行B步骤。
B、源eNB向目标eNB发送切换请求(handover request)，如果目标eNB有足够的资源分配给切换UE，则执行C步骤。
C、目标eNB会向源eNB反馈切换确认消息(handover request confirm)，以上过程称为切换准备阶段。
D、源eNB随后向UE发送切换命令(handover command)，收到切换命令后，UE断开与源eNB的连接，数据传输停止。UE开始监听目标小区的下行同步信息，在完成下行同步后，开始随机接入过程。首先UE发送随机接入前导信号，目标eNB检测到前导序列后，向UE发送上行传输资源，如UL-Grant(Uplink Grant，上行调度资源指示)等，UE接收到UL-Grant后，向目标eNB反馈切换完成消息(handover complete)。
F、在目标eNB返回ACK确认后，切换过程完成，数据传输恢复。
G、目标eNB还向MME(Mobility Management Entity，移动管理实体)/UPE(User Plan Entity，用户平面实体)发送上行路径更新消息(Uplink plane update)。
上述小区切换过程中，数据传输中断的时间相对较长，平均约为50ms，对于传输延迟较高的应用场景，如在线视频、实时游戏等应用场景，小区的切换会破坏数据传输的连续性，影响用户体验。
发明内容
本发明实施例提供的小区切换方法、装置及设备，以降低小区切换过程中的延迟时间。
第一方面，本发明实施例提供了一种小区切换方法，所述方法包括：
用户终端接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
所述用户终端根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述切换命令中还携带有定时提前量TA提示信息；
所述方法还包括：所述用户终端根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA；
所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，包括：
所述用户终端根据在所述目标小区使用的TA以及所述上行调度资源指示，向所述目标小区发送上行数据。
可选的，所述TA提示信息为所述用户终端在所述目标小区使用的TA；
或者，
所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息；
所述用户终端根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA，包括：
用户终端根据所述第一指示信息，将用户终端在所述源小区使用的TA作为在目标小区使用的TA；
或者，
所述TA提示信息包括源小区的TA、指示根据源小区的TA计算目标小区的TA的第二指示信息以及源小区与目标小区的下行信号发送时刻信息；
所述用户终端根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA，包括：
所述用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
所述用户终端根据所述源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差；
所述用户终端根据所述下行同步时延差以及源小区的TA，确定用户终端在目标小区使用的TA。
可选的，所述下行信号发送时刻信息为以下至少一种：
指示源小区与目标小区的下行信号为同步信号的第三指示信息；
包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
为目标小区与源小区的下行信号发送时刻差值。
可选的，所述切换命令中还携带有上行发射功率提示信息；
所述方法还包括：所述用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，包括：
所述用户终端根据所述上行调度资源指示，以所述上行发射功率向所述目标小区发送上行数据。
可选的，所述上行发射功率提示信息为所述用户终端在所述目标小区使用的上行发射功率；
或者，
所述上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
所述上行发射功率提示信息为指示所述用户终端根据所述目标小区的下 行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息；
所述用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率，包括：
所述用户终端根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；
所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；
所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；
所述用户终端根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息；
所述用户终端根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示，包括：
用户终端根据所述PDCCH监听指示信息监听所述PDCCH；
用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息,，包括：PDCCH的监听有效时间信息；
所述用户终端根据所述PDCCH监听指示信息监听所述PDCCH，包括：
所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
可选的，所述用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，向所述目标小区发送所述上行数据之前，还包括：
所述用户终端在所述PDCCH所对应的物理上行链路控制信道PUCCH上向所述目标小区发送确认ACK消息，用于所述目标小区根据所述ACK消息确定用户终端已监听到所述PDCCH；
或者，
所述用户终端在所述上行调度资源指示所指示的通信资源上向所述目标小区发送解调参考信号DMRS，其中，所述上行调度资源指示携带用于指示用户终端发送DMRS的第一循环移位值，所述用户终端发送的所述DMRS的循环移位值为不同于所述第一循环移位值的第二循环移位值，用于所述目标小区根据用户终端发送的所述DMRS确定用户终端已监听到所述PDCCH。
第二方面，本发明实施例提供了一种小区切换方法，包括：
源小区获取目标小区的上行调度资源指示的提示信息；
源小区向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述源小区获取目标小区的上行调度资源指示的提示信息，包括：
所述源小区向所述目标小区发送切换请求消息；
所述源小区接收所述目标小区发送的切换确认消息，所述切换确认消息中携带所述上行调度资源指示的提示信息。
可选的，所述切换请求消息中携带上行调度资源指示请求信息。
可选的，所述切换确认消息中还携带所述目标小区的TA；
所述切换命令中还携带TA提示信息，其中所述TA提示信息为所述目标小区的TA。
可选的，所述切换请求消息中还携带目标小区TA请求信息。
可选的，所述切换确认消息中还携带所述目标小区的下行信号发送时刻；
所述方法还包括：所述源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
所述源小区确定用户终端具有TA计算能力，生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
所述源小区生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息；
所述切换命令中还携带所述TA提示信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
可选的，所述下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
或者，
所述下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
可选的，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
可选的，所述方法还包括：所述源小区获取所述目标小区的定时提前量TA提示信息；
所述切换命令中还携带所述TA提示信息，用于所述用户终端根据所述TA提示信息确定所述用户终端在所述目标小区使用的TA。
可选的，所述源小区获取目标小区的定时提前量TA提示信息，包括：
所述源小区确定与目标小区的下行信号为同步信号，生成用于指示源小 区与目标小区的下行信号为同步信号的第三指示信息，其中所述第三指示信息为源小区与目标小区的下行信号发送时刻信息；
所述源小区确定用户终端具有的TA计算能力，生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
所述源小区生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
可选的，所述源小区获取目标小区的定时提前量TA提示信息，包括：
所述源小区确定所述源小区与所述目标小区是否均处于协作多点传输COMP通信场景下；
若是，则所述源小区确定所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息，用于用户终端根据所述第一指示信息，将源小区的TA作为目标小区的TA。
可选的，所述方法还包括：
所述源小区获取所述用户终端在所述目标小区的上行发射功率提示信息，用于用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
所述切换命令中携带所述上行发射功率提示信息。
可选的，所述上行发射功率提示信息为所述源小区预先设置的所述用户终端在所述目标小区使用的上行发射功率；
或者，
所述上行发射功率提示信息为所述源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
所述上行发射功率提示信息为所述源小区指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息，用于所述用户终端根据所述第四指 示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；所述用户终端根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
第三方面，本发明实施例提供了一种小区切换方法，包括：
目标小区接收源小区发送的切换请求消息；
所述目标小区向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切 换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定所述目标小区的上行调度资源指示；所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述切换请求消息中携带上行调度资源指示请求信息。
可选的，所述切换确认消息中还携带所述目标小区的TA，用于源小区将所述目标小区的TA作为TA提示信息。
可选的，所述切换请求消息中还携带目标小区TA请求信息。
可选的，所述切换确认消息中还携带所述目标小区的下行信号发送时刻，用于源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
可选的，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
可选的，所述方法还包括：
目标小区在所述上行调度资源指示所对应的通信资源上接收上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据；
或者，
目标小区在所述上行调度资源指示所对应的通信资源上检测确认ACK消息，根据所述ACK消息确定用户终端已检测到所述PDCCH；
或者，
目标小区在所述上行调度资源指示所对应的通信资源上检测解调参考信号DMRS；
所述目标小区确定检测到的所述DMRS的循环移位值是否与所述上行调度资源指示中所携带的第一循环移位值相同，若不同，则确定用户终端已检测到所述PDCCH。
第四方面，本发明实施例提供了一种小区切换装置，所述装置作为用户终端，包括：
接收模块，用于接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
上行调度资源指示确定模块，用于根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
发送模块，用于根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述装置还包括：TA确定模块；
所述切换命令中还携带有定时提前量TA提示信息；
所述TA确定模块，用于根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA；
所述发送模块，具体用于根据在所述目标小区使用的TA以及所述上行调度资源指示，向所述目标小区发送上行数据。
可选的，所述TA提示信息为所述用户终端在所述目标小区使用的TA；
或者，
所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息；
所述TA确定模块，具体用于根据所述第一指示信息，将用户终端在所述源小区使用的TA作为在目标小区使用的TA；
或者，
所述TA提示信息包括源小区的TA、指示根据源小区的TA计算目标小区的TA的第二指示信息以及源小区与目标小区的下行信号发送时刻信息；
所述TA确定模块，具体用于根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
根据所述源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差；
根据所述下行同步时延差以及源小区的TA，确定用户终端在目标小区使用的TA。
可选的，所述下行信号发送时刻信息为以下至少一种：
指示源小区与目标小区的下行信号为同步信号的第三指示信息；
包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
为目标小区与源小区的下行信号发送时刻差值。
可选的，所述装置还包括：上行发射功率确定模块；
所述切换命令中还携带有上行发射功率提示信息；
所述上行发射功率确定模块，用于根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
所述发送模块，具体用于根据所述上行调度资源指示，以所述上行发射功率向所述目标小区发送上行数据。
可选的，所述上行发射功率提示信息为所述用户终端在所述目标小区使用的上行发射功率；
或者，
所述上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
所述上行发射功率提示信息为指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息；
所述上行发射功率确定模块，具体用于根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；根据接收到的所述小区广播消息，确定所述下行信号接收功率；根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息；
所述上行调度资源指示确定模块，具体用于根据所述PDCCH监听指示信息监听所述PDCCH；
根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息；
所述上行调度资源指示确定模块，具体用于根据所述PDCCH的监听有 效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
可选的，上述装置还包括：PDCCH检测确认模块，用于根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，发送所述上行数据之前，在所述PDCCH所对应的物理上行链路控制信道PUCCH上向所述目标小区发送确认ACK消息，用于所述目标小区根据所述ACK消息确定用户终端已监听到所述PDCCH；
或者，
所述PDCCH检测确认模块，用于根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，发送所述上行数据之前，在所述上行调度资源指示所指示的通信资源上向所述目标小区发送解调参考信号DMRS，其中，所述上行调度资源指示携带用于指示用户终端发送DMRS的第一循环移位值，所述用户终端发送的所述DMRS的循环移位值为不同于所述第一循环移位值的第二循环移位值，用于所述目标小区根据用户终端发送的所述DMRS确定用户终端已监听到所述PDCCH。
第五方面，本发明实施例提供了一种小区切换装置，所述装置作为源小区通信终端，包括：
信息获取模块，用于获取目标小区的上行调度资源指示的提示信息；
切换命令发送模块，用于向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述信息获取模块，具体用于向所述目标小区发送切换请求消息；接收所述目标小区发送的切换确认消息，所述切换确认消息中携带所述上行调度资源指示的提示信息。
可选的，所述切换请求消息中携带上行调度资源指示请求信息。
可选的，所述切换确认消息中还携带所述目标小区的TA；
所述切换命令中还携带TA提示信息，其中所述TA提示信息为所述目标小区的TA。
可选的，所述切换请求消息中还携带目标小区TA请求信息。
可选的，所述切换确认消息中还携带所述目标小区的下行信号发送时刻；
所述信息获取模块，还用于根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息；
所述切换命令中还携带所述TA提示信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
可选的，所述下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
或者，
所述下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
可选的，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
可选的，所述信息获取模块，还用于获取所述目标小区的定时提前量TA提示信息；
所述切换命令中还携带所述TA提示信息，用于所述用户终端根据所述TA提示信息确定所述用户终端在所述目标小区使用的TA。
可选的，所述信息获取模块，具体用于确定与目标小区的下行信号为同 步信号，生成用于指示源小区与目标小区的下行信号为同步信号的第三指示信息，其中所述第三指示信息为源小区与目标小区的下行信号发送时刻信息；生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
可选的，所述信息获取模块，具体用于确定所述源小区与所述目标小区是否均处于协作多点传输COMP通信场景下；若是，则确定所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息，用于用户终端根据所述第一指示信息，将源小区的TA作为目标小区的TA。
可选的，所述信息获取模块，还用于获取所述用户终端在所述目标小区的上行发射功率提示信息，用于用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
所述切换命令中携带所述上行发射功率提示信息。
可选的，所述上行发射功率提示信息为所述源小区预先设置的所述用户终端在所述目标小区使用的上行发射功率；
或者，
所述上行发射功率提示信息为所述源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
所述上行发射功率提示信息为所述源小区指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息，用于所述用户终端根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；所述用户终端根据 所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
第六方面，本发明实施例提供了一种小区切换装置，所述装置作为目标小区通信终端，包括：
接收模块，用于接收源小区发送的切换请求消息；
切换确认消息发送模块，用于向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定所述目标小区的上行调度资源指示；所述用户终端根据所述上 行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
可选的，所述切换请求消息中携带上行调度资源指示请求信息。
可选的，所述切换确认消息中还携带所述目标小区的TA，用于源小区将所述目标小区的TA作为TA提示信息。
可选的，所述切换请求消息中还携带目标小区TA请求信息。
可选的，所述切换确认消息中还携带所述目标小区的下行信号发送时刻，用于源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
可选的，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
可选的，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
可选的，所述上行调度资源指示生效时间信息至少包括以下一种信息：
用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
上行调度资源指示的有效时长或有效次数；
所述上行调度资源指示的生效时刻。
可选的，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
可选的，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
可选的，所述PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听所述PDCCH的时刻。
可选的，所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上接收上行数据；
或者，
所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上检测确认ACK消息，根据所述ACK消息确定用户终端已检测到所述PDCCH；
或者，
所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上检测解调参考信号DMRS；确定检测到的所述DMRS的循环移位值是否与所述上行调度资源指示中所携带的第一循环移位值相同，若不同，则确定用户终端已检测到所述PDCCH。
第七方面，本发明实施例提供了一种用户终端设备，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
第八方面，本发明实施例提供了一种终端设备，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
获取目标小区的上行调度资源指示的提示信息；
向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确 定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
第九方面，本发明实施例提供了一种终端设备，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
接收源小区发送的切换请求消息；
向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定目标小区的上行调度资源指示；所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
本发明实施例的小区切换方法、装置及设备，UE从源小区处获取UL-Grant等上行传输资源，省略随机接入过程，缩短数据传输中断时间，从而降低小区切换过程中数据传输延迟时间。
附图说明
图1示出了现有技术小区切换过程的流程图；
图2示出了本发明实施例一小区切换方法的流程图；
图3示出了本发明实施例二小区切换方法的流程图；
图4示出了本发明实施例三小区切换方法的流程图；
图5示出了UE获取目标小区TA的信令流程图；
图6示出了UE获取目标小区的UL-grant的第一方式流程图；
图7示出了UE获取目标小区的UL-grant的第二方式流程图；
图8示出了本发明实施例四小区切换方法的流程图；
图9示出了本发明实施例五小区切换方法的流程图；
图10示出了本发明实施例六小区切换方法的流程图；
图11示出了本发明实施例七小区切换方法的流程图；
图12示出了本发明实施例八小区切换方法的流程图；
图13示出了本发明实施例九小区切换方法的流程图；
图14示出了本发明实施例十小区切换方法的流程图；
图15示出了本发明实施例十一小区切换方法的流程图；
图16示出了本发明实施例十二小区切换方法的流程图；
图17示出了本发明实施例一小区切换装置的结构示意图；
图18示出了本发明实施例二小区切换装置的结构示意图；
图19示出了本发明实施例三小区切换装置的结构示意图；
图20示出了本发明实施例一用户终端设备的结构示意图；
图21示出了本发明实施例一终端设备的结构示意图；
图22示出了本发明实施例二终端设备的结构示意图。
具体实施方式
本发明中，以UE作为用户终端为例对本发明的技术方案进行说明，对于其它设备作为用户终端而言的方案，不再详细赘述。
UE在小区切换过程中，数据传输中断的平均时间为50毫秒，对于在线视频、实时游戏等时延要求比较高的应用场景，会破坏数据传输的连续性，影响用户体验。
上述小区切换过程中，UE侧数据传输中断的因素主要在于UE需要利用随机接入过程获取目标小区分配的上行传输资源，如UL-Grant等。随机接入过程中，UE侧的时延包括：等待随机接入时频资源、发送随机前导序列、等待目标小区的随机接入响应、处理随机接入响应消息以及等待上行传输资源等。
为了降低小区切换过程中数据传输延迟时间，本发明实施例提供了一种小区切换方法，本方法中，UE从源小区处获取UL-Grant等上行传输资源，省略随机接入过程，缩短数据传输中断时间，从而降低小区切换过程中数据传输延迟时间。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具 体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
本发明实施例的小区切换方法可以应用于源小区与目标小区属于相同eNB的场景，也可以应用于源小区所在基站与目标小区所在基站为不同的基站的切换场景。
图2示出了本发明实施例一小区切换方法的流程图，本方法的执行主体为UE，主要步骤包括：
步骤S11：UE接收源小区发送的切换命令，切换命令中携带有目标小区的UL-grant提示信息。
源小区确定UE进行小区切换时，向UE发送切换命令，并在向UE发送的切换命令中携带UL-grant提示信息。
步骤S12：UE根据UL-grant提示信息，确定目标小区的UL-grant。
UE接收到的源小区发送的切换命令后，根据切换命令中的UL-grant提示信息得到目标小区的UL-grant。
步骤S13：UE根据UL-grant向目标小区发送上行数据。
UE确定目标小区的UL-grant后，根据需要向目标小区发送上行数据，其中发送的上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
本实施例中，UE接收到源小区发送的切换命令后，可以直接根据切换命令中携带的UL-grant提示信息确定目标小区的UL-grant，省略了随机接入过程，由此减少了UE在小区切换过程中的传输中断时间。
图3示出了本发明实施例二小区切换方法的流程图，执行主体为UE，主要处理步骤包括：
步骤S21：UE接收源小区发送的切换命令，切换命令中携带有目标小区的UL-grant提示信息、TA(Timing Advance，定时提前量)提示信息以及上行发射功率提示信息。
为完成小区切换过程，UE除获取目标小区的UL-grant外，还需进一步获取UE在目标小区使用的TA以及UE向目标小区发送数据的上行发射功率。
UE获取在目标小区使用的TA以及UE向目标小区发送数据的上行发射 功率可以在UE中预先配置，当UE需要进行小区切换时，直接使用预先配置好的数据。
为了合理配置UE与目标小区的通信策略，本实施例中由源小区通过提示信息指示UE目标小区通信所需使用的TA以及向目标小区发送数据的上行发射功率。
本实施例中以切换命令中同时携带TA提示信息以及上行发射功率提示信息为例进行说明。本领域技术人员可以理解，在具体实施本方案时，源小区发送的切换命令中可以携带TA提示信息及上行发射功率提示信息中的任一种，未携带的信息可以其它方式获取，如UE预先配置的方式获取，对于此种实施方式，本实施例中不再赘述。
步骤S22：UE根据UL-grant提示信息，确定目标小区的UL-grant。
步骤S23：UE根据TA提示信息，确定UE在目标小区使用的TA。
步骤S24：UE根据上行发射功率提示信息，确定UE在目标小区的上行发射功率。
上述步骤S22～S24不区分执行的先后顺序，本实施例中为了对技术方案进行说明，以S22至S24递增顺序对本方案进行说明。
步骤S25：UE根据目标小区的UL-grant、TA，以确定出的上述上行发射功率向目标小区发送上行数据。
UE确定目标小区的UL-grant、TA以及在目标小区的上行发射功率后，UE监听目标小区的下行同步信号，完成与目标小区的下行同步后，向目标小区发送上行数据。
具体的，UE根据目标小区的UL-grant，确定能够传输的数据量，根据可传数据量的大小，向目标小区传输切换完成消息、缓存状态报告以及业务数据中的一种或多种。
本实施例中，UE从源小区的切换命令中获取目标小区的UL-grant、TA以及上行发射功率的提示信息，根据相应提示信息确定目标小区的UL-grant、TA以及上行发射功率，无需再通过对目标小区的随机接入过程获取上述信息，从而省去随机接入过程，缩短小区切换过程中UE侧数据传输中断时间，降低数据传输延迟，提高用户体验度。
图4示出了本发明实施例三小区切换方法的流程图，该方法的执行主体 为UE，主要处理步骤包括：
步骤S31：UE向源小区发送邻区测量报告。
图5示出了UE获取目标小区TA的信令流程图，从图中可看出UE获取目标小区TA的步骤包括：
(1)UE根据源小区的配置完成邻区测量，并向源小区发送邻区测量报告(RRC Measurement report)。
(2)源小区根据UE发送的邻区测量报告，确定UE是否需要进行小区切换，若确定需要进行小区切换，源小区向目标小区发送小区切换请求(Handover request)，其中，可选的，在小区切换请求中携带目标小区TA请求信息(TA request)。可以理解的，如果源小区与目标小区属于同一个基站，该过程为基站内部实现，本发明不作限制。
(3)目标小区根据接收到的小区切换请求确定是否有足够的通信资源分配给UE，若有，则向源小区发送小区切换确认消息(Handover confirm)，其中，可选的，在小区切换确认消息中携带目标小区的TA(TA value)。
另外，目标小区在向源小区发送的小区切换确认消息中还可以携带关于目标小区UL-grant提示信息。
目标小区在小区切换确认消息中是否携带目标小区的TA和/或UL-grant提示信息可以由目标小区触发，也可以由小区切换请求消息中携带的相关请求信息触发，例如目标小区根据小区切换请求信息中所携带的目标小区TA请求信息在小区切换确认消息中携带目标小区的TA。
本实施例中，目标小区向源小区发送的小区确认消息中可以携带目标小区的TA提示信息以及目标小区的UL-grant提示信息。
本实施例中，目标小区向源小区发送的小区确认消息中可以携带目标小区的TA提示信息以及目标小区的UL-grant提示信息。
源小区根据切换确认消息生成切换命令，并在切换命令中携带目标小区的TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。
(4)源小区向UE发送小区切换命令(handover command)，其中小区切换命令携带于源小区向UE发送的无线资源重配置消息(RRC reconfiguration中。
步骤S32：UE接收源小区发送的切换命令，切换命令中携带有UE在目标小区的TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。
可选的，UE接收源小区发送的切换命令后，如图5中的步骤(5)UE向源小区发送混合自动重传请求确认消息(HARQ Ack)。
可以理解的，切换命令中具体携带的信息是根据目标小区发送给源小区的切换确认消息中携带的信息确定的，如，可以只携带UL Grant提示信息，或者携带UL Grant提示信息及TA提示信息，等，本发明不作限制。
步骤S33：UE根据切换命令确定UE在目标小区使用的TA、UL-grant以及在目标小区的上行发射功率。
由于切换命令中携带有目标小区的TA提示信息，因此UE可以根据切换命令中携带的信息确定目标小区的TA。
当切换命令中直接携带目标小区的TA时，TA提示信息为目标小区的TA。
切换命令中所携带的上行发射功率提示信息可以有多种设置实现方式，例如上行发射功率提示信息可以为UE在目标小区使用的上行发射功率，此时UE将在源小区使用的上行发射功率作为在目标小区使用的上行发射功率。
又例如，上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息，此时UE在源小区发射功率的基础上按照偏移量信息进行偏移进而确定在目标小区中的上行发射功率。
又例如，上行发射功率提示信息为指示UE根据目标小区的下行信号发送功率和下行信号接收功率确定UE在目标小区的上行发射功率的第四指示信息。
此时UE确定在目标小区确定上行发射功率的方法如下：
(1)UE根据第四指示信息接收目标小区的小区广播消息，其中在小区广播消息中携带目标小区的下行信号发送功率。
(2)UE根据接收到的小区广播消息，确定下行信号接收功率。
(3)UE根据下行信号发送功率及下行信号接收功率，确定目标小区的下行路径损耗值。
(4)UE根据下行路径损耗值以及预先设定的目标小区期望的接收功率， 确定UE在目标小区的上行发射功率。
同样的目标小区的UL-grant提示信息也可以有多种实现方式，例如UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息，由此可以使UE直接确定目标小区的UL-grant以及UL-grant的生效时间。
另外一种实现方式中，目标小区的UL-grant提示信息还可以包括用于指示UE监听目标小区PDCCH(Physical Downlink Control Channel，物理下行控制信道)的PDCCH监听指示信息。
此种方式下，UE根据UL-grant提示信息，确定目标小区的UL-grant的步骤包括：
(1)UE根据PDCCH监听指示信息监听PDCCH；
(2)UE根据监听到的PDCCH上所传输的DCI(Downlink Control Information，下行控制信息)，确定目标小区的UL-grant。
步骤S34：UE根据目标小区的UL-grant、TA，以确定出的上述上行发射功率向目标小区发送切换完成消息，其中，此步骤即为图5中的步骤(6)。
本实施例中，UE从源小区发送的切换命令中获取在目标小区使用的TA、目标小区的UL-grant以及根据切换命令的上行发射功率提示信息确定UE在目标小区的上行发射功率，省去了随机接入过程，缩短小区切换过程中数据传输中断时间。
以下将结合附图对UE获取目标小区的UL-grant的过程进行详细说明。
图6示出了UE获取目标小区的UL-grant的第一方式流程图，包括：
本方式中目标小区向源小区发送的切换确认消息中携带目标小区的UL-Grant提示信息，所述UL-Grant提示信息中可以包含目标小区的UL Grant。具体的，该UL Grant中包含的内容有物理资源，如物理资源块(Physical resource block,PRB)，调制编码方式(Modulation and Codeding Scheme)，冗余版本等信息。
进一步可选的，该UL-Grant提示信息中还可以包含周期信息，该周期信息用于指示上述UL Grant的周期,如周期配置为1ms或1个子帧或1个TTI时，表示UE在每ms或每个子帧或每一个TTI都可以使用该UL Grant。如周期配置为2ms或2个子帧或2个TTI时，表示UE在每2ms或每2个子帧或每2个TTI可以使用该UL Grant。
进一步可选的，该UL-Grant提示信息中还可以包含偏移量信息，该偏移量信息用于指示上述UL Grant的时刻，如在哪些时刻可以使用该UL Grant。例如，偏移量信息为1，周期为2ms，则表示在子帧1，子帧3，子帧5上可以使用该UL Grant，具体的计算公式如下：
[(无线帧号*10)+子帧号]模(周期)＝(偏移量)模(周期)；
进一步可选的，该UL-Grant提示信息中还可以包含UL Grant生效时间信息，该UL Grant生效时间信息用于指示该UL Grant在UE接收到切换命令后延迟T1时间生效，或者用于指示该UL Grant在所述目标小区向源小区发送切换确认消息后T2时间生效。例如，目标小区分配UL-Grant后，考虑后续的处理时延，可以指示在切换确认消息发送完成的一段时间T2后UL-Grant生效。
进一步可选的，该UL-Grant提示信息中还可以包含UL Grant持续时间信息，该UL Grant持续时间用于指示该UL grant的有效时长或有效的传输次数，有效时长为10帧或有效次数为10次，即从第一个有效帧算起连续10个帧后UL-Grant失效或从第一个有效子帧算起连续10个子帧后失效；或者用于指示该UL grant在T3时刻前有效，例如T3时间为切换完成命令发送时刻，或者为UE确认切换完成命令发送成功的时刻，或者T3为无线帧号为10，子帧号为3的时刻之前有效。
源小区通过切换命令消息效上述UL-Grant提示信息发送给UE。
UE接收到所述切换命令消息后，根据切换所述UL-Grant提示信息或者目标小区的UL Grant，周期信息，偏移量信息，生效时间信息，持续时间信息中的一个或多个，确定在目标小区使用的UL Grant，并根据UL Grant发送缓存状态报告，切换完成消息及业务数据中的至少一个。
通过采用上述UL-Grant配置方式，能够最大程度地减少UE等待上行资源的时间，更快地获得发送切换完成消息的资源。
其中时频资源是SPS(Semi-Persistent-Scheduling，半静态调度)配置的，并且给出了SPS配置有效期，有效期的计算可以基于源小区发送给目标小区的UE之前的BSR(Buffer State Report，缓存状态报告)确定，具体步骤包括：
(1)UE根据源小区的配置完成邻区测量，并向源小区发送邻区测量报 告(RRC Measurement report)。
(2)源小区根据UE发送的邻区测量报告，确定UE是否需要进行小区切换，若确定需要进行小区切换，源小区向目标小区发送小区切换请求(Handover request)，其中，可选的，切换请求消息中可以携带UL-Grant请求标志和UE最近一次上报的BSR信息，表明希望目标小区能够指示UL-Grant信息用于快速切换，上述BSR信息有助于目标小区分配适合UE的上行通信资源。
(3)目标小区根据接收到的小区切换请求确定是否有足够的通信资源分配给UE，若有，则向源小区发送小区切换确认消息(Handover confirm)。
其中，在切换确认消息中携带目标小区的UL-Grant和调度时刻信息。可选的，给出一组调度时刻组合及配置有效时长或有效的传输次数，例如指示在每个帧中的子帧2、子帧7上UL-Grant生效，有效时长为10帧或有效次数为10次，即从第一个有效帧算起连续10个帧后UL-Grant失效或从第一个有效子帧算起连续10个子帧后失效。
(4)源基站获得目标小区的UL-Grant和SPS调度时刻信息后，通过切换命令发送给UE。
(5)UE向源小区发送混合自动重传请求ACK消息，断开与源小区的连接。
(6)UE在完成目标小区的下行同步后，即根据SPS调度时刻和UL-Grant信息发送切换完成消息，并在后续可能的SPS调度资源上发送之前未发送完成的上行数据。目标小区在相应小区分配的SPS时刻的UL-Grant资源上检测是否有切换UE的上行数据到达，如果数据到达则开始SPS有效期计时，SPS资源分配的停止时刻由目标小区根据UE业务类型和待传输数据量决定。采用半静态调度模式的UL-Grant，能够最大程度地减少UE等待上行资源的时间，更快地获得发送切换完成消息的资源。
图7示出了UE获取目标小区的UL-grant的第二方式流程图。
本方式中目标小区向源小区发送的切换确认消息中携带目标小区的UL-Grant提示信息,所述UL提示信息中包含指示UE监听目标小区PDCCH的信息。
其中进一步可选的，该UL-Grant提示信息中还可以包含周期信息，该周 期信息用于指示UE监听目标小区PDCCH的周期,如周期配置为1ms或1个子帧或1个TTI时，表示UE在每ms或每个子帧或每一个TTI都监听目标小区的PDCCH。如周期配置为2ms或2个子帧或2个TTI时，表示UE在每2ms或每2个子帧或每2个TTI监听目标小区PDCCH。
进一步可选的，该UL-Grant提示信息中还可以包含偏移量信息，该偏移量信息用于指示UE监听目标小区PDCCH的时刻，如在哪些时刻可以UE监听目标小区PDCCH。例如，偏移量信息为1，周期为2ms，则表示在子帧1，子帧3，子帧5上监听目标小区PDCCH，具体的计算公式如下：
[(无线帧号*10)+子帧号]模(周期)＝(偏移量)模(周期)；
进一步可选的，该UL-Grant提示信息中还可以包含UE监听目标小区PDCCH生效时间信息，该UE监听目标小区PDCCH生效时间信息用于指示该UE监听目标小区PDCCH在UE接收到切换命令后延迟T1时间生效，或者用于指示该UE监听目标小区PDCCH在所述目标小区向源小区发送切换确认消息后T2时间生效。
进一步可选的，该UL-Grant提示信息中还可以包含UE监听目标小区PDCCH持续时间信息，该UE监听目标小区PDCCH持续时间用于指示该UE监听目标小区PDCCH的有效时长或有效的传输次数，有效时长为10帧或有效次数为10次，即从第一个有效帧算起连续10个帧后UE监听目标小区PDCCH失效或从第一个有效子帧算起连续10个子帧后失效；或者用于指示该UE监听目标小区PDCCH在T3时刻前有效，例如T3时间为切换完成命令发送时刻，或者为UE确认切换完成命令发送成功的时刻，或者T3为无线帧号为10，子帧号为3的时刻之前有效。
进一步可选的，该ULGrant提示信息中还可以包含UE监听目标小区PDCCH使用的无线网络临时标识RNTI(Radio Network Temporary Identifier)，如C-RNTI或SPS-RNTI。
源小区通过切换命令消息效上述UL-Grant提示信息发送给UE。
UE接收到所述切换命令消息后，根据切换所述UL-Grant提示信息或者目标小区的UL Grant，周期信息，偏移量信息，生效时间信息，持续时间信息中的一个或多个，监听目标小区的PDCCH，并根据PDCCH传输的DCI确定UL Grant，并根据UL Grant发送缓存状态报告，切换完成消息及业务数 据中的至少一个。
通过采用上述UL-Grant配置方式，能够最大程度地减少UE等待上行资源的时间，更快地获得发送切换完成消息的资源。
可选的，源小区的切换消息中指示目标小区PDCCH的SPS信息，UE根据指示在目标小区检测PDCCH，并根据DCI其中的UL-Grant信息完成切换完成消息的发送。
具体步骤包括：
(1)UE根据源小区的配置完成邻区测量，并向源小区发送邻区测量报告(RRC Measurement report)。
(2)源小区根据UE发送的邻区测量报告，确定UE是否需要进行小区切换，若确定需要进行小区切换，源小区向目标小区发送小区切换请求(Handover request)，其中，切换请求消息中可以携带PDCCH请求标志和UE最近一次上报的BSR信息，表明希望目标eNB能够指示PDCCH信息用于快速切换，上述BSR信息有助于目标小区分配适合UE的上行通信资源。
(3)目标小区根据接收到的小区切换请求确定是否有足够的通信资源分配给UE，若有，则向源小区发送小区切换确认消息(Handover confirm)。
其中，在切换确认消息中携带目标小区PDCCH的调度时刻信息。
目标小区考虑切换确认消息后续的处理时延，可以指示在切换确认命令发送完成后的一段时间T后PDCCH生效；考虑到无线链路不确定的传输质量，可能会导致切换相关消息的重传，为保证PDCCH指示的资源能被UE使用，时间T可能会设置的较长，这样会延长数据中断时间，所以另一种可能的资源分配方式是半静态调度模式，即给出一组调度时刻组合和有效期指示，类似于方法一，例如在每个帧中的子帧2、子帧7上检测PDCCH，有效期为10帧或有效10次。
(4)源基站获得PDCCH的SPS调度时刻信息后，通过切换命令发送给UE。
(5)UE向源小区发送混合自动重传请求ACK消息，断开与源小区的连接。
(6)UE在完成目标小区的下行同步后，即根据SPS调度时刻信息检测PDCCH，并从PDCCH中的DCI信息中获得UL-Grant，在UL-Grant指示的 资源上发送切换完成消息，并在后续可能的PDCCH SPS资源上继续检测PDCCH。目标小区在相应小区分配的SPS时刻PDCCH指示的UL-Grant资源上检测是否有切换UE的上行数据到达，如果数据到达则开始SPS有效期计时，SPS资源分配的停止时刻由目标小区根据UE业务类型和待传输数据量决定。相对于方法一，目标小区不需要在切换确认命令中就指示UL-Grant，即不需要提前分配好具体的上行资源，可以在UE确认收到源小区下发的切换命令，并且由源小区通知目标小区切换命令发送完成后，目标小区再根据当时的调度情况分配UL-Grant资源，在资源利用上有更大的灵活性。对于目标小区通过PDCCH向UE指示UL-Grant的场景，在目标小区发送完成PDCCH信息后，目标小区将在UL-Grant信息对应的时频资源上检测是否有UE发来的上行信号。目标小区可以通过检测上行DMRS(De Modulation Reference Signal，解调参考信号)判断是否有UE发送的数据，如果检测到DMRS则UE发送了数据，如果检测不到DMRS则UE没有发送数据。
UE没有在UL-Grant指示的时频资源上发送数据，可能的原因有两种，一种是UE没有成功检测到PDCCH信息，另一种可能是虽然UE成功获取了UL-Grant信息，但是UE没有需要发送的数据(或者数据还没有准备好)。
本实施例中提供一种识别UE没有在UL-Grant指示时频资源上发送数据的原因(以上两种原因中的一种)的方法。即当UE收到PDCCH中的UL-Grant信息，同时又没有数据需要发送，此时UE可以不在PUSCH(Physical Uplink Shared Channel，物理上行共享信道)上发送填充(padding)，而是通过PUCCH(Physical Uplink Control CHannel，物理上行链路控制信道)信道反馈ACK(Acknowledgement，确认)信息，或者在UL-Grant指示的时频资源上使用与预配置的循环移位值发送导频，具体描述如下：
前提条件：目标小区通过检测上行DMRS信号是否存在，判断UE是否发送了数据。在UL-Grant信息中包含3bit信息指示DMRS所用循环移位值(范围是0-7)，对于使用SPS方式分配的资源，由于SPS激活命令中用于指示DMRS所用循环移位值的3bit信息为全0，代表DMRS所用循环移位为0。目标小区在此循环移位值对应的导频检测窗口中检测DMRS信号，如果信号能量超过某一阈值则判断用户已发送上行信号，如果低于某一阈值则判 断UE没有发送数据。
具体过程：当UE收到PDCCH指示的UL-Grant信息时，如果此时没有数据需要发送，则UE可以使用以下两种方法中的一种反馈给小区信息，使小区确认PDCCH接收成功。
方法一：UE在PUCCH信道上反馈ACK信息给目标小区。当UE在子帧n的PDSCH信道接收目标小区发送的下行数据时，需要在子帧n+4的PUCCH信道向目标小区反馈ACK/NACK(Nacknowledge，非确认)信息。同时根据3GPP协议TS36.213中规定，所用的PUCCH资源索引与指示PDSCH(Physical Downlink Shared Channel，物理下行共享信道)的PDCCH信息的CCE(Control Channel Element，控制信道粒子)索引有一一对应关系。因为PDCCH的CCE索引在子帧内是唯一的，所以本实施例将这种反馈ACK/NACK的方式扩展到上行传输，即当PDCCH用于指示上行传输的UL-Grant时，也在其对应的PUCCH资源上发送ACK，向小区表明UE正常接收到了PDCCH指示，只是此时没有数据需要发送。如果小区在PDCCH指示的ULGrant对应的上行资源上没有检测到对应的DMRS，且在相应的PUCCH资源上没有检测到ACK，则判断UE没有成功检测到PDCCH，反之，判断UE成功检测到PDCCH。
方法二：UE在UL-Grant指示的时频资源上发送DMRS导频信号，该DMRS导频信号使用预配置的循环移位值，其中，所述预配置的循环移位值与用户发送数据时使用的循环值不同。在PUSCH信道中，一个子帧中有两个符号用于发送DMRS，同时在UL-Grant中携带了3bit信息指示DMRS所用的循环移位。本实施例中，UE在相同的DMRS时频资源上，发送不同的循环移位对应的DMRS导频码，目标小区在相应的DMRS检测窗口如果检测到这个DMRS，则认为UE成功接收到PDCCH但是此时无数据；如果没检测到，则判断UE没有成功检测到PDCCH。
以上两种判断方法，具体选用哪一种，可以由RRC信令配置或者UL-Grant信息中配置。
第二种方法中，所述预配置的循环值可以由目标小区配置(RRC信令配置或者UL-Grant信息中配置)具体的DMRS循环移位值，或者配置一个偏移值，此时最终使用的用于反馈的循环移位值为原循环移位值与偏移值相加 再对8取模得到。如果在UL Grant中配置，可能需要增加新的比特信息用于指示在没有数据时使用的DMRS循环移位值。
当UE收到PDCCH指示的UL-Grant信息时，如果没有数据需要发送，则按照以上方法中的一种向小区反馈，随后也不需要再检测PHICH信道反馈的ACK/NACK信息；同时，当小区下发了UL-Grant信息后，没有检测到指示的DMRS信息，而是检测到以上两种方法中某一种的反馈信息，则不需要再在PHICH信道上反馈ACK/NACK信息。
以上描述的方法，不限于只应用在切换场景中，可以扩展到所有PDCCH指示UL-Grant的场景，例如，在UE与服务小区进行通信过程中，如果UE检测到PDCCH，但不发送数据，都可以使用以上方法通知小区成功接收到PDCCH，本发明不作限制。
此外，上述方法中由于基站预先分配上行资源，导致在UE没有上行数据时，资源会被浪费，所以本发明提供了另一种方法，来提升资源利用率。
具体的，基站为两个或以上UE分配相同的UL Grant，其中不同的UE使用不同的DMRS发送各自的数据。其中所述不同的DMRS可以通过RRC消息或者UL Grant指示，具体方法如前面实施例所示。
当基站在UL Grant对应的资源上检测到多个DMRS，但没有成功解出数据时，说明发生冲突，此时，基站可以根据检测到的DMRS，为对应的UE分配专门的UL Grant，用于指示该UE进行自适应重传；或者在PHICH信道上反馈NACK，指示UE指示非自适应重传，此时，基站最多只能指示一个UE执行非适应重传，以免重传时再次冲突。
通过上述方法，可以实现多个UE共享相同的上行资源，提升资源利用率，同时，基于DMRS检测，可以避免重传时冲突，减少数据传输时延。
本发明实施例中提供一种识别UE没有在UL-Grant指示时频资源上发送数据的原因的方法，在切换场景中，如果小区能够判断UE没有成功收到PDCCH信息，则可能是下行链路信道条件较差，需要小区采取措施提高下行PDCCH的检测性能，保证切换过程顺利完成；如果判断是UE还没有需要发送的数据，则不需要特别操作。同时UE在接收到UL-Grant后，在没有数据需要发送的情况下不发送数据，相对于发送无意义随机数的方法，能够减少 小区间干扰并降低UE功耗。
图8示出了本发明实施例四小区切换方法的流程图，该方法的执行主体为UE，包括：
步骤S41：UE向源小区发送邻区测量报告。
UE根据源小区的配置完成邻区测量，并向源小区发送邻区测量报告。
源小区根据UE发送的邻区测量报告，确定UE是否需要进行小区切换，若确定需要进行小区切换，源小区向目标小区发送小区切换请求。
目标小区根据接收到的小区切换请求确定是否有足够的通信资源分配给UE，若有，则向源小区发送小区切换确认消息。
本实施例中，在切换确认消息中携带UL-grant提示信息，优选的，源小区向目标小区发送的切换请求消息中携带目标小区UL-grant请求信息。
本实施例中，目标小区根据与源小区小区的实际通信场景确定UE在目标小区TA提示信息，并通过源小区向UE发送所述TA提示信息。
其中，具体确定方法包括：目标小区确定源小区与目标小区是否均处于协作多点传输COMP通信场景下；若是，则目标小区确定TA提示信息为指示目标小区的TA与源小区的TA相同的第一指示信息。
可选的，目标小区还进一步根据UE的通信需求确定UE在目标小区中的上行发射功率，并根据确定的结果生成上行发射功率提示信息，例如目标小区将UE在源小区中所使用的上行发射功率作为UE在目标小区的发射功率。
源小区根据目标小区发送的切换确认消息，生成切换命令，并在切换命令中携带TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。具体方法如前面实施例所述，在此不作赘述。
步骤S42：UE接收源小区发送的切换命令，切换命令中携带有TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。
步骤S43：UE根据切换命令确定UE在目标小区使用的TA、UL-grant以及在目标小区的上行发射功率。
本实施例中，UE根据TA提示信息确定将源小区的TA作为目标小区的TA。
本实施例中，UE根据上行发射功率提示信息确定UE在目标小区使用的上行发射功率的方式与实施例三中相同，本实施例不再赘述。
本实施例中，UE根据UL-grant提示信息确定目标小区的UL-grant的方式、实现过程与实施例三中相同，本实施例不再赘述。
步骤S44：UE根据目标小区的UL-grant、TA，以确定出的上述上行发射功率向目标小区发送切换完成消息。
本实施例中，UE根据源小区发送的切换命令获取目标小区的UL-grant，将源小区的TA作为目标小区的TA以及根据切换命令的上行发射功率提示信息确定UE在目标小区的上行发射功率，省去了随机接入过程，缩短小区切换过程中数据传输中断时间。
图9示出了本发明实施例五小区切换方法的流程图，该方法的执行主体为UE，包括：
步骤S51：UE向源小区发送邻区测量报告。
UE根据源小区的配置完成邻区测量，并向源小区发送邻区测量报告。
源小区根据UE发送的邻区测量报告，确定UE是否需要进行小区切换，若确定需要进行小区切换，源小区向目标小区发送小区切换请求。
目标小区根据接收到的小区切换请求确定是否有足够的通信资源分配给UE，若有，则向源小区发送小区切换确认消息。
本实施例中，在切换确认消息中携带UL-grant提示信息，优选的，源小区向目标小区发送的切换请求消息中携带目标小区UL-grant请求信息。
本实施例中目标小区将指示根据源小区的TA计算目标小区的TA的第二指示信息作为目标小区的TA提示信息。
可选的，所述目标小区的TA提示信息中还可以包含下行信号发送时刻信息，具体的，所述下行信号发送时刻信息可以指示源小区的下行信号发送时刻和目标小区的下行信号发送时刻，或者，所述下行信号发送时刻信息可以指示源小区的下行信号发送时刻与目标小区的下行信号发送时刻的差值，或者，所述下行信号发送时刻信息可以指示原小区的下行信号发送时刻与目标小区的下行信号发送时刻相同。
本实施例中确定源小区与目标小区的下行信号发送时刻信息，确定的方式包括：
方式一：源小区与目标小区的下行信号同步时，确定下行信号发送时刻信息为指示源小区与目标小区的下行信号为同步信号的第三指示信息。
方式二：源小区与目标小区的下行信号发送时刻不同时，源小区向目标小区发送的上述小区切换请求中携带目标小区下行信号发送时刻请求信息，在接收的小区切换确认消息中携带目标小区的下行信号发送时刻。
此时，源小区可以将源小区的下行信号发送时刻以及目标小区的下行信号发送时刻确定为源小区与目标小区的下行信号发送时刻信息。
或者，
源小区将源小区与目标小区的下行信号发送时刻差值作为源小区与目标小区的下行信号发送时刻信息。
另外，源小区还进一步根据UE的通信需求确定UE在目标小区中的上行发射功率，并根据确定的结果生成上行发射功率提示信息，例如源小区将UE在源小区中所使用的上行发射功率作为UE在目标小区的发射功率。
源小区生成切换命令，并在切换命令中携带TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。
步骤S52：UE接收源小区发送的切换命令，切换命令中携带有TA提示信息、UL-grant提示信息以及在目标小区的上行发射功率提示信息。
步骤S53：UE根据切换命令中的TA提示信息计算目标小区的TA。
其中，UE计算目标小区的TA的方法包括：
(1)UE根据下行信号发送时刻信息确定源小区与目标小区的下行信号同步时：
A、UE根据第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
B、UE根据源小区下行信号到达时刻(SeNB downlink timing)与目标小区源小区下行信号到达时刻(TeNB downlink timing)，确定源小区与目标小区的下行同步时延差；
C、UE根据下行同步时延差以及源小区的TA，确定UE在目标小区使用的TA。
具体计算公式如下：
TeNB TA＝SeNB TA+2*(TeNB downlink timing–SeNB downlink timing)
即目标eNB(TeNB TA)的TA，等于UE侧检测到的源SeNB的TA与 两eNB下行同步时延差值2倍的和，其中TeNB downlink timing为UE检测到的TeNB下行信号到达时刻，SeNB downlink timing为UE检测到的SeNB下行信号到达时刻。以上公式默认源eNB和目的eNB的下行发送时刻是相同的，即两个eNB是同步的。
(2)如果两个eNB的发送时刻是不同步的，则可以由源小区通知UE两个eNB间的同步时延差，辅助TA计算。则目标eNB TA的计算公式修正为：
TeNB TA＝SeNB TA+2*(TeNB downlink timing–SeNB downlink timing-(TeNB transmitting timing–SeNB transmitting timing))
其中TeNB transmitting timing为TeNB的下行发送时刻，SeNB transmitting timing为SeNB的下行发送时刻，(TeNB transmitting timing–SeNB transmitting timing)即为两个小区间发送时刻同步时延差，具体实施时，源小区可以将该两个数值分别发送给UE，也可以将该两个数据的差值发送给UE。
上述算法中，源eNB对应源小区，目标eNB对应目标小区，该示例以目标小区的基站与源小区的基站为不同的基站为例进行说明，具体实施时目标小区与源小区的基站相同时也可以类比上述公式进行计算。
步骤S54：UE分别根据切换命令中的UL-grant提示信息以及上行发射功率提示信息确定目标小区的UL-grant以及UE在目标小区的上行发射功率。
本实施例中，UE根据上行发射功率提示信息确定UE在目标小区使用的上行发射功率的方式与实施例三中相同，本实施例不再赘述。
本实施例中，UE根据UL-grant提示信息确定目标小区的UL-grant的方式、实现过程与实施例三中相同，本实施例不再赘述。
步骤S55：UE根据目标小区的UL-grant、TA，以确定出的上述上行发射功率向目标小区发送切换完成消息。
本实施例中，UE从源小区发送的切换命令中获取目标小区的UL-grant，令UE根据TA提示信息自行计算目标小区的TA以及根据切换命令的上行发射功率提示信息确定UE在目标小区的上行发射功率，省去了随机接入过程，缩短小区切换过程中数据传输中断时间。
图10示出了本发明实施例六小区切换方法的流程图，本方法的执行主体 为源小区，主要步骤包括：
步骤S61：源小区获取目标小区的上行调度资源指示UL-grant提示信息。
步骤S62：源小区向用户设备UE发送切换命令，切换命令中携带UL-grant提示信息。
其中，UL-grant提示信息用于UE确定目标小区的UL-grant，UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
图11示出了本发明实施例七小区切换方法的流程图，本方法的执行主体为源小区，主要步骤包括：
步骤S71：源小区获取目标小区的UL-grant提示信息、TA提示信息以及上行发射功率提示信息。
为使UE完成小区切换过程，UE除获取目标小区的UL-grant外，还需进一步获取UE在目标小区使用的TA以及UE向目标小区发送数据的上行发射功率。
本实施例中UE所需的TA、UL-grant以及上行发射功率的提示信息均由源小区获取并发送给UE。
具体实施时，目标小区的TA和/或上行发射功率提示信息可以由UE预先自行设置，无需源小区获取。
步骤S72：源小区向目标小区发送切换命令，切换命令中携带UL-grant提示信息、TA提示信息以及上行发射功率提示信息。
源小区向UE发送的UL-grant提示信息用于UE根据UL-grant提示信息，确定目标小区的UL-grant；TA提示信息用于UE确定UE在目标小区使用的TA；上行发射功率提示信息用于UE确定UE在目标小区的上行发射功率。
图12示出了本发明实施例八小区切换方法的流程图，本方法的执行主体为源小区，主要步骤包括：
步骤S81：源小区接收UE发送的邻区测量报告。
步骤S82：源小区确定进行小区切换时，向目标小区发送小区切换请求消息。
本实施例中，源小区向目标小区小区发送的小区切换请求消息中携带UL-grant请求信息以及目标小区TA请求信息。
步骤S83：源小区接收目标小区发送的切换确认消息，切换确认消息中携带UL-grant提示信息以及目标小区的TA。
本实施例中UL-grant提示信息可以有两种实现方式：
方式一：UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息。
UL-grant生效时间信息至少包括以下一种信息：用于指示UL-grant在UE接收到切换命令后的预设时间后生效的第五指示信息；UL-grant的有效时长或有效次数；UL-grant的生效时刻。
方式二：UL-grant提示信息包括用于指示UE监听目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于UE根据PDCCH监听指示信息监听PDCCH，UE根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant。
PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于UE根据PDCCH的监听有效时间信息监听PDCCH。
PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到切换命令后的预设时间后开始监听PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听PDCCH的时刻。
源小区获取UL-grant提示信息的具体过程在上述实施例三以及附图6及图7中进行了详细阐述，本实施例不再赘述。
步骤S84：源小区获取目标小区的上行发射功率提示信息。
源小区获取UE在目标小区的上行发射功率提示信息，用于UE根据上行发射功率提示信息，确定UE在目标小区的上行发射功率。
本实施例中，上行发射功率提示信息可以为源小区预先设置的UE在目标小区使用的上行发射功率；
或者，
上行发射功率提示信息为源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
上行发射功率提示信息为源小区指示UE根据目标小区的下行信号发送功率和下行信号接收功率确定UE在目标小区的上行发射功率的第四指示信息，用于UE根据第四指示信息接收目标小区的小区广播消息，小区广播消息中携带目标小区的下行信号发送功率；UE根据接收到的小区广播消息，确定下行信号接收功率；UE根据下行信号发送功率及下行信号接收功率，确定目标小区的下行路径损耗值；UE根据下行路径损耗值以及预先设定的目标小区期望的接收功率，确定UE在目标小区的上行发射功率。
步骤S85：源小区向目标小区发送切换命令，切换命令中携带目标小区的TA、UL-grant提示信息以及上行发射功率提示信息。
其中，TA提示信息为目标小区的TA。
本实施例中，源小区向UE发送的UL-grant提示信息用于UE根据UL-grant提示信息，确定目标小区的UL-grant；TA提示信息用于UE确定UE在目标小区使用的TA；上行发射功率提示信息用于UE确定UE在目标小区的上行发射功率。
本实施例的方法能够使UE从源小区发送的切换命令中获取在目标小区使用的TA、目标小区的UL-grant以及根据切换命令的上行发射功率提示信息确定UE在目标小区的上行发射功率，省去了随机接入过程，缩短小区切换过程中数据传输中断时间。
图13示出了本发明实施例九小区切换方法的流程图，本方法的执行主体为源小区，主要步骤包括：
步骤S91：源小区接收UE发送的邻区测量报告。
步骤S92：源小区确定进行小区切换时，向目标小区发送小区切换请求消息。
本实施例中，源小区向目标小区发送的切换请求消息中还携带目标小区下行信号发送时刻请求信息以及UL-grant请求信息。
步骤S93：源小区接收目标小区发送的切换确认消息，切换确认消息中携带UL-grant提示信息以及目标小区的下行信号发送时刻。
本实施例中源小区获取的UL-grant提示信息以及获取方式与实施例八中相同，不再赘述。
步骤S94：源小区根据目标小区的下行信号发送时刻生成目标小区的TA 提示信息。
源小区生成TA提示信息的方法包括：
(1)源小区根据目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
(2)源小区确定UE具有TA计算能力，生成用于指示UE根据源小区的TA计算目标小区的TA的第二指示信息；
(3)源小区生成TA提示信息，其中TA提示信息中包括源小区的TA、第二指示信息以及下行信号发送时刻信息。
步骤S95：源小区获取目标小区的上行发射功率提示信息。
本实施例中源小区生成目标小区上行发射功率提示信息的方式与实施例八中相同，此处不再赘述。
步骤S96：源小区向目标小区发送切换命令，切换命令中携带TA提示信息、UL-grant提示信息以及上行发射功率提示信息。
切换命令中还携带TA提示信息，用于UE根据第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据下行同步时延差以及源小区的TA，确定目标小区的TA。
下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
或者，
下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
切换命令中还携带TA提示信息，用于UE根据TA提示信息确定UE在目标小区使用的TA。
图14示出了本发明实施例十小区切换方法的流程图，本方法的执行主体为源小区，主要步骤包括：
步骤S101：源小区接收UE发送的邻区测量报告。
步骤S102：源小区确定进行小区切换时，向目标小区发送小区切换请求消息。
切换请求消息中携带UL-grant请求信息。
步骤S103：源小区接收目标小区发送的切换确认消息，切换确认消息中携带UL-grant提示信息。
步骤S104：源小区获取目标小区的TA提示信息。
源小区确定与目标小区的下行信号为同步信号，生成用于指示源小区与目标小区的下行信号为同步信号的第三指示信息，其中第三指示信息为源小区与目标小区的下行信号发送时刻信息；
源小区确定UE具有的TA计算能力，生成用于指示UE根据源小区的TA计算目标小区的TA的第二指示信息；
源小区生成TA提示信息，其中TA提示信息中包括源小区的TA、第二指示信息以及下行信号发送时刻信息，用于UE根据第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据下行同步时延差以及源小区的TA，确定目标小区的TA。
源小区获取目标小区的定时提前量TA提示信息，包括：源小区确定源小区与目标小区是否均处于协作多点传输COMP通信场景下；若是，则源小区确定TA提示信息为指示目标小区的TA与源小区的TA相同的第一指示信息，用于UE根据第一指示信息，将源小区的TA作为目标小区的TA。
步骤S105：源小区获取目标小区的上行发射功率提示信息。
步骤S106：源小区向目标小区发送切换命令，切换命令中携带TA提示信息、UL-grant提示信息以及上行发射功率提示信息。
图15示出了本发明实施例十一小区切换方法的流程图，本方法的执行主体为目标小区，主要步骤包括：
步骤S111：目标小区接收源小区发送的切换请求消息；
步骤S112：目标小区向源小区发送切换确认消息，切换确认消息中携带上行调度资源指示UL-grant提示信息，切换确认消息用于源小区根据切换确认消息向UE发送切换命令，切换命令中携带UL-grant提示信息，UL-grant提示信息用于UE确定目标小区的UL-grant；UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
图16示出了本发明实施例十二小区切换方法的流程图，本方法的执行主体为目标小区，主要步骤包括：
步骤S121：目标小区接收源小区发送的切换请求消息切换请求消息中携带UL-grant请求信息以及目标小区TA请求信息。
步骤S122：目标小区向源小区发送切换确认消息，切换确认消息中带目标小区的TA以及UL-grant提示信息。
目标小区的TA，用于源小区将目标小区的TA作为TA提示信息。
另外，本发明实施例在具体实施时，切换确认消息中还可以不携带目标小区的TA，而是携带目标小区的下行信号发送时刻，用于源小区根据目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
此时，可以在切换请求消息中携带目标小区下行信号发送时刻请求信息。
本实施例中，UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息。
UL-grant生效时间信息至少包括以下一种信息：
用于指示UL-grant在UE接收到切换命令后的预设时间后生效的第五指示信息；
UL-grant的有效时长或有效次数；
UL-grant的生效时刻。
或者，UL-grant提示信息包括用于指示UE监听目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于UE根据PDCCH监听指示信息监听PDCCH，UE根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant。
PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于UE根据PDCCH的监听有效时间信息监听PDCCH。
PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到切换命令后的预设时间后开始监听PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听PDCCH的时刻。
步骤S123：目标小区接收UE上报的信息。
具体的，目标小区在UL-grant所对应的通信资源上接收上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据；
或者，
目标小区在UL-grant所对应的通信资源上检测确认ACK消息，根据ACK消息确定UE已检测到PDCCH；
或者，
目标小区在UL-grant所对应的通信资源上检测解调参考信号DMRS；
目标小区确定检测到的DMRS的循环移位值是否与UL-grant中所携带的第一循环移位值相同，若不同，则确定UE已检测到PDCCH。
图17示出了本发明实施例一小区切换装置的结构示意图，该装置作为用户设备UE，包括：接收模块1701、UL-grant确定模块1702以及发送模块1703；其中，
接收模块1701，用于接收源小区发送的切换命令，切换命令中携带有目标小区的上行调度资源指示UL-grant提示信息；
UL-grant确定模块1702，用于根据UL-grant提示信息，确定目标小区的UL-grant；
发送模块1703，用于根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
在上述实施例中，装置还包括：TA确定模块；
切换命令中还携带有定时提前量TA提示信息；
TA确定模块，用于根据TA提示信息，确定UE在目标小区使用的TA；
相应的，发送模块1703，具体用于根据在目标小区使用的TA以及UL-grant，向目标小区发送上行数据。
在上述实施例中，TA提示信息为UE在目标小区使用的TA；
或者，
TA提示信息为指示目标小区的TA与源小区的TA相同的第一指示信息；
相应的，TA确定模块，具体用于根据第一指示信息，将UE在源小区使用的TA作为在目标小区使用的TA；
或者，
TA提示信息包括源小区的TA、指示根据源小区的TA计算目标小区的TA的第二指示信息以及源小区与目标小区的下行信号发送时刻信息；
相应的，TA确定模块，具体用于根据第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差；
根据下行同步时延差以及源小区的TA，确定UE在目标小区使用的TA。
在上述实施例中，所述下行信号发送时刻信息为以下至少一种：
指示源小区与目标小区的下行信号为同步信号的第三指示信息；
包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
为目标小区与源小区的下行信号发送时刻差值。
在上述实施例中，装置还包括：上行发射功率确定模块；
切换命令中还携带有上行发射功率提示信息；
上行发射功率确定模块，用于根据上行发射功率提示信息，确定UE在目标小区的上行发射功率；
相应的，发送模块1703，具体用于根据UL-grant，以上行发射功率向目标小区发送上行数据。
在上述实施例中，上行发射功率提示信息为UE在目标小区使用的上行发射功率；
或者，
上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
上行发射功率提示信息为指示UE根据目标小区的下行信号发送功率和下行信号接收功率确定UE在目标小区的上行发射功率的第四指示信息；
相应的，上行发射功率确定模块，具体用于根据第四指示信息接收目标小区的小区广播消息，小区广播消息中携带目标小区的下行信号发送功率；根据接收到的小区广播消息，确定下行信号接收功率；根据下行信号发送功率及下行信号接收功率，确定目标小区的下行路径损耗值；根据下行路径损耗值以及预先设定的目标小区期望的接收功率，确定UE在目标小区的上行 发射功率。
在上述实施例中，UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息。
在上述实施例中，UL-grant生效时间信息至少包括以下一种信息：
用于指示UL-grant在UE接收到切换命令后的预设时间后生效的第五指示信息；
UL-grant的有效时长或有效次数；
UL-grant的生效时刻。
在上述实施例中，UL-grant提示信息包括用于指示UE监听目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息；
相应的，UL-grant确定模块1702，具体用于根据PDCCH监听指示信息监听PDCCH；
根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant。
在上述实施例中，PDCCH监听指示信息，包括：PDCCH的监听有效时间信息；
相应的，UL-grant确定模块1702，具体用于根据PDCCH的监听有效时间信息监听PDCCH。
在上述实施例中，PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到切换命令后的预设时间后开始监听PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听PDCCH的时刻。
在上述实施例中，上述装置还包括：PDCCH检测确认模块，用于根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant之后，发送上行数据之前，在PDCCH所对应的物理上行链路控制信道PUCCH上向目标小区发送确认ACK消息，用于目标小区根据ACK消息确定UE已监听到PDCCH；
或者，
PDCCH检测确认模块，用于根据监听到的PDCCH上所传输的下行控制 信息DCI，确定目标小区的UL-grant之后，发送上行数据之前，在UL-grant所指示的通信资源上向目标小区发送解调参考信号DMRS，其中，UL-grant携带用于指示UE发送DMRS的第一循环移位值，UE发送的DMRS的循环移位值为不同于第一循环移位值的第二循环移位值，用于目标小区根据UE发送的DMRS确定UE已监听到PDCCH。
图18示出了本发明实施例二小区切换装置的结构示意图，该装置作为源小区通信终端，包括：信息获取模块1801以及切换命令发送模块1802；其中，
信息获取模块1801，用于获取目标小区的上行调度资源指示UL-grant提示信息；
切换命令发送模块1802，用于向用户设备UE发送切换命令，切换命令中携带UL-grant提示信息，其中，UL-grant提示信息用于UE确定目标小区的UL-grant，UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
在上述实施例中，信息获取模块1801，具体用于向目标小区发送切换请求消息；接收目标小区发送的切换确认消息，切换确认消息中携带UL-grant提示信息。
在上述实施例中，切换请求消息中携带UL-grant请求信息。
在上述实施例中，切换确认消息中还携带目标小区的TA；
信息获取模块1801，还用于将目标小区的TA作为TA提示信息；
相应的，切换命令中还携带TA提示信息。
在上述实施例中，切换请求消息中还携带目标小区TA请求信息。
在上述实施例中，切换确认消息中还携带目标小区的下行信号发送时刻；
信息获取模块1801，还用于根据目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
生成用于指示UE根据源小区的TA计算目标小区的TA的第二指示信息；
生成TA提示信息，其中TA提示信息中包括源小区的TA、第二指示信息以及下行信号发送时刻信息；
相应的，切换命令中还携带TA提示信息，用于UE根据第二指示信息， 分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据下行同步时延差以及源小区的TA，确定目标小区的TA。
在上述实施例中，下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
或者，
下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
在上述实施例中，切换请求消息中还携带目标小区下行信号发送时刻请求信息。
在上述实施例中，信息获取模块1801，还用于获取目标小区的定时提前量TA提示信息；
相应的，切换命令中还携带TA提示信息，用于UE根据TA提示信息确定UE在目标小区使用的TA。
在上述实施例中，信息获取模块1801，具体用于确定与目标小区的下行信号为同步信号，生成用于指示源小区与目标小区的下行信号为同步信号的第三指示信息，其中第三指示信息为源小区与目标小区的下行信号发送时刻信息；生成用于指示UE根据源小区的TA计算目标小区的TA的第二指示信息；生成TA提示信息，其中TA提示信息中包括源小区的TA、第二指示信息以及下行信号发送时刻信息，用于UE根据第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据下行同步时延差以及源小区的TA，确定目标小区的TA。
在上述实施例中，信息获取模块1801，具体用于确定源小区与目标小区是否均处于协作多点传输COMP通信场景下；若是，则确定TA提示信息为指示目标小区的TA与源小区的TA相同的第一指示信息，用于UE根据第一指示信息，将源小区的TA作为目标小区的TA。
在上述实施例中，信息获取模块1801，还用于获取UE在目标小区的上行发射功率提示信息，用于UE根据上行发射功率提示信息，确定UE在目标 小区的上行发射功率；
相应的，切换命令中携带上行发射功率提示信息。
在上述实施例中，上行发射功率提示信息为源小区预先设置的UE在目标小区使用的上行发射功率；
或者，
上行发射功率提示信息为源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
或者，
上行发射功率提示信息为源小区指示UE根据目标小区的下行信号发送功率和下行信号接收功率确定UE在目标小区的上行发射功率的第四指示信息，用于UE根据第四指示信息接收目标小区的小区广播消息，小区广播消息中携带目标小区的下行信号发送功率；UE根据接收到的小区广播消息，确定下行信号接收功率；UE根据下行信号发送功率及下行信号接收功率，确定目标小区的下行路径损耗值；UE根据下行路径损耗值以及预先设定的目标小区期望的接收功率，确定UE在目标小区的上行发射功率。
在上述实施例中，UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息。
在上述实施例中，UL-grant生效时间信息至少包括以下一种信息：
用于指示UL-grant在UE接收到切换命令后的预设时间后生效的第五指示信息；
UL-grant的有效时长或有效次数；
UL-grant的生效时刻。
在上述实施例中，UL-grant提示信息包括用于指示UE监听目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于UE根据PDCCH监听指示信息监听PDCCH，UE根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant。
在上述实施例中，PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于UE根据PDCCH的监听有效时间信息监听PDCCH。
在上述实施例中，PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到切换命令后的预设时间后开始监听PDCCH的第六指 示信息；
PDCCH的有效时长或有效次数；
监听PDCCH的时刻。
图19示出了本发明实施例三小区切换装置的结构示意图，该装置作为目标小区通信终端，包括：接收模块1901以及切换确认消息发送模块1902；其中，
接收模块1901，用于接收源小区发送的切换请求消息；
切换确认消息发送模块1902，用于向源小区发送切换确认消息，切换确认消息中携带上行调度资源指示UL-grant提示信息，切换确认消息用于源小区根据切换确认消息向UE发送切换命令，切换命令中携带UL-grant提示信息，UL-grant提示信息用于UE确定目标小区的UL-grant；UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
在上述实施例中，切换请求消息中携带UL-grant请求信息。
在上述实施例中，切换确认消息中还携带目标小区的TA，用于源小区将目标小区的TA作为TA提示信息。
在上述实施例中，切换请求消息中还携带目标小区TA请求信息。
在上述实施例中，切换确认消息中还携带目标小区的下行信号发送时刻，用于源小区根据目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
在上述实施例中，切换请求消息中还携带目标小区下行信号发送时刻请求信息。
在上述实施例中，UL-grant提示信息包括目标小区的UL-grant以及UL-grant生效时间信息。
在上述实施例中，UL-grant生效时间信息至少包括以下一种信息：
用于指示UL-grant在UE接收到切换命令后的预设时间后生效的第五指示信息；
UL-grant的有效时长或有效次数；
UL-grant的生效时刻。
在上述实施例中，UL-grant提示信息包括用于指示UE监听目标小区的 物理下行控制信道PDCCH的PDCCH监听指示信息，用于UE根据PDCCH监听指示信息监听PDCCH，UE根据监听到的PDCCH上所传输的下行控制信息DCI，确定目标小区的UL-grant。
在上述实施例中，PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于UE根据PDCCH的监听有效时间信息监听PDCCH。
在上述实施例中，PDCCH的监听有效时间信息至少包括以下一种：
用于指示在接收到切换命令后的预设时间后开始监听PDCCH的第六指示信息；
PDCCH的有效时长或有效次数；
监听PDCCH的时刻。
在上述实施例中，接收模块1901，还用于在UL-grant所对应的通信资源上接收上行数据；
或者，
接收模块1901，还用于在UL-grant所对应的通信资源上检测确认ACK消息，根据ACK消息确定UE已检测到PDCCH；
或者，
接收模块1901，还用于在UL-grant所对应的通信资源上检测解调参考信号DMRS；确定检测到的DMRS的循环移位值是否与UL-grant中所携带的第一循环移位值相同，若不同，则确定UE已检测到PDCCH。
图20示出了本发明实施例一用户终端设备的结构示意图，用户终端设备2000包括通信接口2001、存储器2003和处理器2002，其中，通信接口2001、处理器2002、存储器2003、通过总线2004相互连接；总线2004可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图20中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
所述通信接口2001用于与发送端通信。存储器2003，用于存放程序。具体地，程序可以包括程序代码，所述程序代码包括计算机操作指令。存储器2003可能包含随机存取存储器(random access memory，简称RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储 器。
处理器2002执行存储器2003所存放的程序，实现本发明前述方法实施例的方法：
包括：
接收源小区发送的切换命令，切换命令中携带有目标小区的上行调度资源指示UL-grant提示信息；
根据UL-grant提示信息，确定目标小区的UL-grant；
根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
上述的处理器2002可以是通用处理器，包括中央处理器(Central Processing Unit，简称CPU)、网络处理器(Network Processor，简称NP)等；还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
图21示出了本发明实施例一终端设备的结构示意图，终端设备2100包括通信接口2101、存储器2103和处理器2102，其中，通信接口2101、处理器2102、存储器2103、通过总线2104相互连接；总线2104可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图21中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
所述通信接口2101用于与发送端通信。存储器2103，用于存放程序。具体地，程序可以包括程序代码，所述程序代码包括计算机操作指令。存储器2103可能包含随机存取存储器(random access memory，简称RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
处理器2102执行存储器2103所存放的程序，实现本发明前述方法实施例的方法：
包括：
获取目标小区的上行调度资源指示UL-grant提示信息；
向用户设备UE发送切换命令，切换命令中携带UL-grant提示信息，其中，UL-grant提示信息用于UE确定目标小区的UL-grant，UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
上述的处理器2102可以是通用处理器，包括中央处理器(Central Processing Unit，简称CPU)、网络处理器(Network Processor，简称NP)等；还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
图22示出了本发明实施例二终端设备的结构示意图，终端设备2200包括通信接口2201、存储器2203和处理器2202，其中，通信接口2201、处理器2202、存储器2203、通过总线2204相互连接；总线2204可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图22中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
所述通信接口2201用于与发送端通信。存储器2203，用于存放程序。具体地，程序可以包括程序代码，所述程序代码包括计算机操作指令。存储器2203可能包含随机存取存储器(random access memory，简称RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
处理器2202执行存储器2203所存放的程序，实现本发明前述方法实施例的方法：
包括：
接收源小区发送的切换请求消息；
向源小区发送切换确认消息，切换确认消息中携带上行调度资源指示UL-grant提示信息，切换确认消息用于源小区根据切换确认消息向UE发送切换命令，切换命令中携带UL-grant提示信息，UL-grant提示信息用于UE确定目标小区的UL-grant；UE根据UL-grant向目标小区发送上行数据，其中上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
上述的处理器2202可以是通用处理器，包括中央处理器(Central Processing Unit，简称CPU)、网络处理器(Network Processor，简称NP)等；还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
本发明实施例的装置及设备可以对应执行上述各实施例的方法，装置及设备实施例不再赘述。
本发明实施例的小区切换方法、装置及设备，UE从源小区处获取UL-Grant等上行传输资源，省略随机接入过程，缩短数据传输中断时间，从而降低小区切换过程中数据传输延迟时间。
本发明实施例的方法、装置及终端可以应用于LTE(LongTermEvolution，长期演进)***的小区切换场景。当源小区与目标小区所在的基站为不同的基站时，源小区基站和目标小区基站之间可以通过X2口通信eNB间的不存在X2口或者X2口不能用于切换过程，则eNB间的通信可以通过MME作中转。
本发明各实施例中，目标小区TA、UL-Grant以及上行发射功率等信息确定获取的方式之间可以相互组合，上述各实施例中的组合仅为举例以对本发明技术方案进行说明，对于其它组合方式本发明中不再一一列举。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (87)

  1. 一种小区切换方法，其特征在于，所述方法包括：
    用户终端接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
    所述用户终端根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
    所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  2. 根据权利要求1所述的方法，其特征在于，所述切换命令中还携带有定时提前量TA提示信息；
    所述方法还包括：所述用户终端根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA；
    所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，包括：
    所述用户终端根据在所述目标小区使用的TA以及所述上行调度资源指示，向所述目标小区发送上行数据。
  3. 根据权利要求2所述的方法，其特征在于，所述TA提示信息为所述用户终端在所述目标小区使用的TA；
    或者，
    所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息；
    所述用户终端根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA，包括：
    用户终端根据所述第一指示信息，将用户终端在所述源小区使用的TA作为在目标小区使用的TA；
    或者，
    所述TA提示信息包括源小区的TA、指示根据源小区的TA计算目标小区的TA的第二指示信息以及源小区与目标小区的下行信号发送时刻信息；
    所述用户终端根据所述TA提示信息，确定所述用户终端在所述 目标小区使用的TA，包括：
    所述用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
    所述用户终端根据所述源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差；
    所述用户终端根据所述下行同步时延差以及源小区的TA，确定用户终端在目标小区使用的TA。
  4. 根据权利要求3所述的方法，其特征在于，所述下行信号发送时刻信息为以下至少一种：
    指示源小区与目标小区的下行信号为同步信号的第三指示信息；
    包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
    为目标小区与源小区的下行信号发送时刻差值。
  5. 根据权利要求1～4中任一项所述的方法，其特征在于，所述切换命令中还携带有上行发射功率提示信息；
    所述方法还包括：所述用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
    所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，包括：
    所述用户终端根据所述上行调度资源指示，以所述上行发射功率向所述目标小区发送上行数据。
  6. 根据权利要求5所述的方法，其特征在于，所述上行发射功率提示信息为所述用户终端在所述目标小区使用的上行发射功率；
    或者，
    所述上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息；
    或者，
    所述上行发射功率提示信息为指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息；
    所述用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率，包括：
    所述用户终端根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；
    所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；
    所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；
    所述用户终端根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
  7. 根据权利要求1～6中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  8. 根据权利要求7所述的方法，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  9. 根据权利要求1～6中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息；
    所述用户终端根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示，包括：
    用户终端根据所述PDCCH监听指示信息监听所述PDCCH；
    用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  10. 根据权利要求9所述的方法，其特征在于，所述PDCCH监听指示信息,，包括：PDCCH的监听有效时间信息；
    所述用户终端根据所述PDCCH监听指示信息监听所述PDCCH，包括：
    所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  11. 根据权利要求10所述的方法，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  12. 根据权利要求9～11任意所述的方法，其特征在于，所述用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，向所述目标小区发送所述上行数据之前，还包括：
    所述用户终端在所述PDCCH所对应的物理上行链路控制信道PUCCH上向所述目标小区发送确认ACK消息，用于所述目标小区根据所述ACK消息确定用户终端已监听到所述PDCCH；
    或者，
    所述用户终端在所述上行调度资源指示所指示的通信资源上向所述目标小区发送解调参考信号DMRS，其中，所述上行调度资源指示携带用于指示用户终端发送DMRS的第一循环移位值，所述用户终端发送的所述DMRS的循环移位值为不同于所述第一循环移位值的第二循环移位值，用于所述目标小区根据用户终端发送的所述DMRS确定用户终端已监听到所述PDCCH。
  13. 一种小区切换方法，其特征在于，包括：
    源小区获取目标小区的上行调度资源指示的提示信息；
    源小区向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  14. 根据权利要求13所述的方法，其特征在于，所述源小区获取目标小区的上行调度资源指示的提示信息，包括：
    所述源小区向所述目标小区发送切换请求消息；
    所述源小区接收所述目标小区发送的切换确认消息，所述切换确认消息 中携带所述上行调度资源指示的提示信息。
  15. 根据权利要求14所述的方法，其特征在于，所述切换请求消息中携带上行调度资源指示请求信息。
  16. 根据权利要求14或15所述的方法，其特征在于，所述切换确认消息中还携带所述目标小区的TA；
    所述切换命令中还携带TA提示信息，其中所述TA提示信息为所述目标小区的TA。
  17. 根据权利要求16所述的方法，其特征在于，所述切换请求消息中还携带目标小区TA请求信息。
  18. 根据权利要求14或15所述的方法，其特征在于，所述切换确认消息中还携带所述目标小区的下行信号发送时刻；
    所述方法还包括：所述源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
    所述源小区确定用户终端具有TA计算能力，生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
    所述源小区生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息；
    所述切换命令中还携带所述TA提示信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
  19. 根据权利要求18所述的方法，其特征在于，所述下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
    或者，
    所述下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
  20. 根据权利要求18或19所述的方法，其特征在于，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
  21. 根据权利要求13～15中任一项所述的方法，其特征在于，所述方法还包括：所述源小区获取所述目标小区的定时提前量TA提示信息；
    所述切换命令中还携带所述TA提示信息，用于所述用户终端根据所述TA提示信息确定所述用户终端在所述目标小区使用的TA。
  22. 根据权利要求21所述的方法，其特征在于，所述源小区获取目标小区的定时提前量TA提示信息，包括：
    所述源小区确定与目标小区的下行信号为同步信号，生成用于指示源小区与目标小区的下行信号为同步信号的第三指示信息，其中所述第三指示信息为源小区与目标小区的下行信号发送时刻信息；
    所述源小区确定用户终端具有的TA计算能力，生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
    所述源小区生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
  23. 根据权利要求21所述的方法，其特征在于，所述源小区获取目标小区的定时提前量TA提示信息，包括：
    所述源小区确定所述源小区与所述目标小区是否均处于协作多点传输COMP通信场景下；
    若是，则所述源小区确定所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息，用于用户终端根据所述第一指示信息，将源小区的TA作为目标小区的TA。
  24. 根据权利要求13～23中任一项所述的方法，其特征在于，所述方法还包括：
    所述源小区获取所述用户终端在所述目标小区的上行发射功率提示信息，用于用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
    所述切换命令中携带所述上行发射功率提示信息。
  25. 根据权利要求24所述的方法，其特征在于，所述上行发射功率提示信息为所述源小区预先设置的所述用户终端在所述目标小区使用的上行发射功率；
    或者，
    所述上行发射功率提示信息为所述源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
    或者，
    所述上行发射功率提示信息为所述源小区指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息，用于所述用户终端根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；所述用户终端根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
  26. 根据权利13～25中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  27. 根据权利要求26所述的方法，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  28. 根据权利要求13～25中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  29. 根据权利要求28所述的方法，其特征在于，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  30. 根据权利要求29所述的方法，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  31. 一种小区切换方法，其特征在于，包括：
    目标小区接收源小区发送的切换请求消息；
    所述目标小区向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定所述目标小区的上行调度资源指示；所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  32. 根据权利要求31所述的方法，其特征在于，所述切换请求消息中携带上行调度资源指示请求信息。
  33. 根据权利要求31或32所述的方法，其特征在于，所述切换确认消息中还携带所述目标小区的TA，用于源小区将所述目标小区的TA作为TA提示信息。
  34. 根据权利要求33所述的方法，其特征在于，所述切换请求消息中还携带目标小区TA请求信息。
  35. 根据权利要求31或32所述的方法，其特征在于，所述切换确认消息中还携带所述目标小区的下行信号发送时刻，用于源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
  36. 根据权利要求35所述的方法，其特征在于，所述切换请求消息中还 携带目标小区下行信号发送时刻请求信息。
  37. 根据权利要求31～36中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  38. 根据权利要求37所述的方法，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  39. 根据权利要求31～36中任一项所述的方法，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  40. 根据权利要求39所述的方法，其特征在于，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  41. 根据权利要求40所述的方法，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  42. 根据权利要求39～41中任一项所述的方法，其特征在于，所述方法还包括：
    目标小区在所述上行调度资源指示所对应的通信资源上接收上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据；
    或者，
    目标小区在所述上行调度资源指示所对应的通信资源上检测确认ACK消息，根据所述ACK消息确定用户终端已检测到所述PDCCH；
    或者，
    目标小区在所述上行调度资源指示所对应的通信资源上检测解调参考信号DMRS；
    所述目标小区确定检测到的所述DMRS的循环移位值是否与所述上行调度资源指示中所携带的第一循环移位值相同，若不同，则确定用户终端已检测到所述PDCCH。
  43. 一种小区切换装置，其特征在于，所述装置作为用户终端，包括：
    接收模块，用于接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
    上行调度资源指示确定模块，用于根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
    发送模块，用于根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  44. 根据权利要求43所述的装置，其特征在于，所述装置还包括：TA确定模块；
    所述切换命令中还携带有定时提前量TA提示信息；
    所述TA确定模块，用于根据所述TA提示信息，确定所述用户终端在所述目标小区使用的TA；
    所述发送模块，具体用于根据在所述目标小区使用的TA以及所述上行调度资源指示，向所述目标小区发送上行数据。
  45. 根据权利要求44所述的装置，其特征在于，所述TA提示信息为所述用户终端在所述目标小区使用的TA；
    或者，
    所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息；
    所述TA确定模块，具体用于根据所述第一指示信息，将用户终端
    在所述源小区使用的TA作为在目标小区使用的TA；
    或者，
    所述TA提示信息包括源小区的TA、指示根据源小区的TA计算目标小区的TA的第二指示信息以及源小区与目标小区的下行信号发送时刻信息；
    所述TA确定模块，具体用于根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻；
    根据所述源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差；
    根据所述下行同步时延差以及源小区的TA，确定用户终端在目标小区使用的TA。
  46. 根据权利要求45所述的装置，其特征在于，所述下行信号发送时刻信息为以下至少一种：
    指示源小区与目标小区的下行信号为同步信号的第三指示信息；
    包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
    为目标小区与源小区的下行信号发送时刻差值。
  47. 根据权利要求43～46中任一项所述的装置，其特征在于，所述装置还包括：上行发射功率确定模块；
    所述切换命令中还携带有上行发射功率提示信息；
    所述上行发射功率确定模块，用于根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
    所述发送模块，具体用于根据所述上行调度资源指示，以所述上行发射功率向所述目标小区发送上行数据。
  48. 根据权利要求47所述的装置，其特征在于，所述上行发射功率提示信息为所述用户终端在所述目标小区使用的上行发射功率；
    或者，
    所述上行发射功率提示信息为在源小区的上行发射功率基础上进行偏移的偏移量信息；
    或者，
    所述上行发射功率提示信息为指示所述用户终端根据所述目标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上 行发射功率的第四指示信息；
    所述上行发射功率确定模块，具体用于根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；根据接收到的所述小区广播消息，确定所述下行信号接收功率；根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
  49. 根据权利要求43～48中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  50. 根据权利要求49所述的装置，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  51. 根据权利要求43～48中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息；
    所述上行调度资源指示确定模块，具体用于根据所述PDCCH监听指示信息监听所述PDCCH；
    根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  52. 根据权利要求51所述的装置，其特征在于，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息；
    所述上行调度资源指示确定模块，具体用于根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  53. 根据权利要求52所述的装置，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  54. 根据权利要求51～53任意所述的装置，其特征在于，还包括：PDCCH检测确认模块，用于根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，发送所述上行数据之前，在所述PDCCH所对应的物理上行链路控制信道PUCCH上向所述目标小区发送确认ACK消息，用于所述目标小区根据所述ACK消息确定用户终端已监听到所述PDCCH；
    或者，
    所述PDCCH检测确认模块，用于根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示之后，发送所述上行数据之前，在所述上行调度资源指示所指示的通信资源上向所述目标小区发送解调参考信号DMRS，其中，所述上行调度资源指示携带用于指示用户终端发送DMRS的第一循环移位值，所述用户终端发送的所述DMRS的循环移位值为不同于所述第一循环移位值的第二循环移位值，用于所述目标小区根据用户终端发送的所述DMRS确定用户终端已监听到所述PDCCH。
  55. 一种小区切换装置，其特征在于，所述装置作为源小区通信终端，包括：
    信息获取模块，用于获取目标小区的上行调度资源指示的提示信息；
    切换命令发送模块，用于向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  56. 根据权利要求55所述的装置，其特征在于，所述信息获取模块，具体用于向所述目标小区发送切换请求消息；接收所述目标小区发送的切换确认消息，所述切换确认消息中携带所述上行调度资源指示的提示信息。
  57. 根据权利要求56所述的装置，其特征在于，所述切换请求消息中携 带上行调度资源指示请求信息。
  58. 根据权利要求56或57所述的装置，其特征在于，所述切换确认消息中还携带所述目标小区的TA；
    所述切换命令中还携带TA提示信息，其中所述TA提示信息为所述目标小区的TA。
  59. 根据权利要求58所述的装置，其特征在于，所述切换请求消息中还携带目标小区TA请求信息。
  60. 根据权利要求56或57所述的装置，其特征在于，所述切换确认消息中还携带所述目标小区的下行信号发送时刻；
    所述信息获取模块，还用于根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息；
    生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；
    生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息；
    所述切换命令中还携带所述TA提示信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
  61. 根据权利要求60所述的装置，其特征在于，所述下行信号发送时刻信息包括源小区的下行信号发送时刻以及目标小区的下行信号发送时刻；
    或者，
    所述下行信号发送时刻信息为目标小区与源小区的下行信号发送时刻差值。
  62. 根据权利要求60或61所述的装置，其特征在于，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
  63. 根据权利要求55～57中任一项所述的装置，其特征在于，所述信息获取模块，还用于获取所述目标小区的定时提前量TA提示信息；
    所述切换命令中还携带所述TA提示信息，用于所述用户终端根据所述TA提示信息确定所述用户终端在所述目标小区使用的TA。
  64. 根据权利要求63所述的装置，其特征在于，所述信息获取模块，具体用于确定与目标小区的下行信号为同步信号，生成用于指示源小区与目标小区的下行信号为同步信号的第三指示信息，其中所述第三指示信息为源小区与目标小区的下行信号发送时刻信息；生成用于指示用户终端根据源小区的TA计算目标小区的TA的第二指示信息；生成TA提示信息，其中所述TA提示信息中包括源小区的TA、所述第二指示信息以及所述下行信号发送时刻信息，用于用户终端根据所述第二指示信息，分别检测源小区与目标小区的下行信号到达时刻，根据源小区与目标小区的下行信号到达时刻以及源小区与目标小区的下行信号发送时刻信息，确定源小区与目标小区的下行同步时延差，根据所述下行同步时延差以及源小区的TA，确定目标小区的TA。
  65. 根据权利要求63所述的装置，其特征在于，所述信息获取模块，具体用于确定所述源小区与所述目标小区是否均处于协作多点传输COMP通信场景下；若是，则确定所述TA提示信息为指示目标小区的TA与所述源小区的TA相同的第一指示信息，用于用户终端根据所述第一指示信息，将源小区的TA作为目标小区的TA。
  66. 根据权利要求55～65中任一项所述的装置，其特征在于，所述信息获取模块，还用于获取所述用户终端在所述目标小区的上行发射功率提示信息，用于用户终端根据所述上行发射功率提示信息，确定所述用户终端在所述目标小区的上行发射功率；
    所述切换命令中携带所述上行发射功率提示信息。
  67. 根据权利要求66所述的装置，其特征在于，所述上行发射功率提示信息为所述源小区预先设置的所述用户终端在所述目标小区使用的上行发射功率；
    或者，
    所述上行发射功率提示信息为所述源小区预先设置的在源小区的上行发射功率基础上进行偏移的偏移量信息；
    或者，
    所述上行发射功率提示信息为所述源小区指示所述用户终端根据所述目 标小区的下行信号发送功率和下行信号接收功率确定所述用户终端在所述目标小区的上行发射功率的第四指示信息，用于所述用户终端根据所述第四指示信息接收所述目标小区的小区广播消息，所述小区广播消息中携带所述目标小区的下行信号发送功率；所述用户终端根据接收到的所述小区广播消息，确定所述下行信号接收功率；所述用户终端根据所述下行信号发送功率及所述下行信号接收功率，确定目标小区的下行路径损耗值；所述用户终端根据所述下行路径损耗值以及预先设定的目标小区期望的接收功率，确定用户终端在所述目标小区的上行发射功率。
  68. 根据权利55～67中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  69. 根据权利要求68所述的装置，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  70. 根据权利要求55～67中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  71. 根据权利要求70所述的装置，其特征在于，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  72. 根据权利要求71所述的方法，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  73. 一种小区切换装置，其特征在于，所述装置作为目标小区通信终端，包括：
    接收模块，用于接收源小区发送的切换请求消息；
    切换确认消息发送模块，用于向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定所述目标小区的上行调度资源指示；所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  74. 根据权利要求73所述的装置，其特征在于，所述切换请求消息中携带上行调度资源指示请求信息。
  75. 根据权利要求73或74所述的装置，其特征在于，所述切换确认消息中还携带所述目标小区的TA，用于源小区将所述目标小区的TA作为TA提示信息。
  76. 根据权利要求75所述的装置，其特征在于，所述切换请求消息中还携带目标小区TA请求信息。
  77. 根据权利要求73或74所述的装置，其特征在于，所述切换确认消息中还携带所述目标小区的下行信号发送时刻，用于源小区根据所述目标小区的下行信号发送时刻以及源小区的下行信号发送时刻，确定源小区与目标小区的下行信号发送时刻信息。
  78. 根据权利要求77所述的装置，其特征在于，所述切换请求消息中还携带目标小区下行信号发送时刻请求信息。
  79. 根据权利要求73～78中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括目标小区的上行调度资源指示以及上行调度资源指示生效时间信息。
  80. 根据权利要求79所述的装置，其特征在于，所述上行调度资源指示生效时间信息至少包括以下一种信息：
    用于指示所述上行调度资源指示在用户终端接收到所述切换命令后的预 设时间后生效的第五指示信息；
    上行调度资源指示的有效时长或有效次数；
    所述上行调度资源指示的生效时刻。
  81. 根据权利要求73～78中任一项所述的装置，其特征在于，所述上行调度资源指示的提示信息包括用于指示所述用户终端监听所述目标小区的物理下行控制信道PDCCH的PDCCH监听指示信息，用于用户终端根据所述PDCCH监听指示信息监听所述PDCCH，用户终端根据监听到的所述PDCCH上所传输的下行控制信息DCI，确定目标小区的上行调度资源指示。
  82. 根据权利要求81所述的装置，其特征在于，所述PDCCH监听指示信息，包括：PDCCH的监听有效时间信息，用于所述用户终端根据所述PDCCH的监听有效时间信息监听所述PDCCH。
  83. 根据权利要求82所述的装置，其特征在于，所述PDCCH的监听有效时间信息至少包括以下一种：
    用于指示在接收到所述切换命令后的预设时间后开始监听所述PDCCH的第六指示信息；
    PDCCH的有效时长或有效次数；
    监听所述PDCCH的时刻。
  84. 根据权利要求81～83中任一项所述的装置，其特征在于，所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上接收上行数据；
    或者，
    所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上检测确认ACK消息，根据所述ACK消息确定用户终端已检测到所述PDCCH；
    或者，
    所述接收模块，还用于在所述上行调度资源指示所对应的通信资源上检测解调参考信号DMRS；确定检测到的所述DMRS的循环移位值是否与所述上行调度资源指示中所携带的第一循环移位值相同，若不同，则确定用户终端已检测到所述PDCCH。
  85. 一种用户终端设备，其特征在于，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
    所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
    当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
    接收源小区发送的切换命令，所述切换命令中携带有目标小区的上行调度资源指示的提示信息；
    根据所述上行调度资源指示的提示信息，确定所述目标小区的上行调度资源指示；
    根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  86. 一种终端设备，其特征在于，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
    所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
    当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
    获取目标小区的上行调度资源指示的提示信息；
    向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，其中，所述上行调度资源指示的提示信息用于所述用户终端确定所述目标小区的上行调度资源指示，所述用户终端根据所述上行调度资源指示向所述目标小区发送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
  87. 一种终端设备，其特征在于，包括：通信接口、存储器、处理器和通信总线，其中，所述通信接口、所述存储器和所述处理器通过所述通信总线通信；
    所述存储器用于存放程序，所述处理器用于执行所述存储器存储的程序；
    当所述用户终端设备运行时，所述处理器运行程序，所述程序包括：
    接收源小区发送的切换请求消息；
    向所述源小区发送切换确认消息，所述切换确认消息中携带上行调度资源指示的提示信息，所述切换确认消息用于源小区根据所述切换确认消息向用户终端发送切换命令，所述切换命令中携带所述上行调度资源指示的提示信息，所述上行调度资源指示的提示信息用于用户终端确定目标小区的上行调度资源指示；所述用户终端根据所述上行调度资源指示向所述目标小区发 送上行数据，其中所述上行数据至少包括以下一种：切换完成消息、缓存状态报告以及业务数据。
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