WO2018202048A1 - 随机接入方法、网络设备和终端设备 - Google Patents
随机接入方法、网络设备和终端设备 Download PDFInfo
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- WO2018202048A1 WO2018202048A1 PCT/CN2018/085358 CN2018085358W WO2018202048A1 WO 2018202048 A1 WO2018202048 A1 WO 2018202048A1 CN 2018085358 W CN2018085358 W CN 2018085358W WO 2018202048 A1 WO2018202048 A1 WO 2018202048A1
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- uplink carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a random access method, a network device, and a terminal device.
- LTE Long Term Evolution
- LTE Advanced LTE-A
- 5G fifth generation communication system
- NR new radio access technology
- the NR cell When the LTE cell and the NR cell are deployed, the NR cell is deployed in the high frequency band, and the LTE cell is deployed in the low frequency band.
- one important deployment frequency band for an NR cell is 3.5 GHz
- an important deployment frequency band for an LTE cell is 1.8 GHz.
- the NR uses an asymmetric carrier F1 that operates in a Time Division Duplexing (TDD) mode
- the LTE uses a symmetric carrier F2 that operates in a Frequency Division Duplexing (FDD) mode. Since LTE's current uplink spectrum utilization is not high, and the 1.8 GHz band has lower channel fading and better coverage than the 3.5 GHz band, the LTE F2 uplink carrier can be shared with 5G.
- TDD Time Division Duplexing
- FDD Frequency Division Duplexing
- the NR's user equipment (UE) and the LTE UE are used together for uplink transmission, which improves the spectrum utilization of the F2 uplink carrier and enhances the uplink coverage capability of the 5G NR.
- the F2 downlink carrier of the LTE is not necessarily shared by the UE of the 5G NR. Therefore, the NR UE can only perform downlink transmission in the F1 downlink carrier and receive the downlink signal of the NR.
- the UE needs to perform random access in order to access the wireless network system and obtain communication services.
- a working cell always transmits synchronization signals and broadcast system information periodically on the F1 downlink carrier.
- the system information includes the information needed to perform random access on the F1 carrier.
- the UE starts searching for cells that may provide services for each frequency band, and selects a target cell for initial random access. After the UE acquires the random access information from the F1 downlink carrier of the target cell, the UE sends a random access request on the F1 uplink carrier for random access.
- the UE can only perform random access on the F1 uplink carrier, and cannot perform random access on the F2 uplink carrier.
- the embodiment of the present application provides a random access method, a network device, and a terminal device, which can implement random access on any uplink carrier.
- the embodiment of the present application provides a random access method, where the method includes: receiving, by the terminal device, a system message sent by the network device on the first downlink carrier, where the terminal device is on the first uplink carrier or on the second uplink.
- a random access request message is sent on the carrier, and the terminal device receives the random access response message sent by the network device on the first downlink carrier.
- the terminal device receives the system message on the first downlink carrier. Since the system message carries the first information required for random access of the first uplink carrier and the second information required for random access of the second uplink carrier, the terminal device can not only initiate random connection on the first uplink carrier. In addition, since the second uplink carrier can obtain the necessary information for initiating random access, random access on the second uplink carrier can also be completed.
- the frequency of the second uplink carrier is lower than the frequency of the first uplink carrier, so that the random access is initiated on the second uplink carrier, the random access success rate is improved, and the uplink coverage performance of the network device is improved.
- the first information includes a center frequency, a bandwidth, and PRACH resource configuration information of the first uplink carrier
- the second information includes a center frequency of the second uplink carrier, Bandwidth and PRACH resource configuration information.
- the method before the terminal device sends the random access request message on the first uplink carrier or on the second uplink carrier, the method further includes: determining, by the terminal device, that A random access request message is sent on an uplink carrier or on a second uplink carrier.
- the terminal device determines to send a random access request message on the first uplink carrier or on the second uplink carrier, including: the terminal device is included according to the system message The second information determines that the random access request message is sent on the second uplink carrier.
- the second uplink carrier since the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, the second uplink carrier generally has lower channel fading and better uplink with respect to the first uplink carrier. cover. If the system message includes the second information required for the second uplink carrier random access, the terminal device may directly determine to send the random access request message on the second uplink carrier. The determination process is simple, the time of random access is shortened, and the success rate of random access is improved.
- the system message further includes access indication information. Determining, by the terminal device, that the random access request message is sent on the first uplink carrier or the second uplink carrier, the terminal device: determining, according to the access indication information included in the system message, that the random access request is sent on the second uplink carrier Message.
- the second uplink carrier since the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, the second uplink carrier generally has lower channel fading and better uplink with respect to the first uplink carrier. cover.
- the network device can directly instruct the terminal device to send a random access request message on the second uplink carrier, which is simple in process and shortens the random access time. Improve the random access success rate.
- the second information further includes power threshold information of the PRACH.
- Determining, by the terminal device, that the random access request message is sent on the first uplink carrier or the second uplink carrier the method includes: determining, by the terminal device, the first uplink in the information according to the received power information of the first downlink carrier and the power threshold information of the PRACH A random access request message is sent on the carrier or on the second uplink carrier.
- the terminal device can accurately determine whether the first uplink carrier or the second uplink carrier satisfies the random access according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH. condition. Sending a random access request message by selecting a better uplink carrier in the first uplink carrier and the second uplink carrier may further improve the random access success rate.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a first power threshold value when the terminal device sends a random access request message on the first uplink carrier.
- the terminal device determines, according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH, that the random access request message is sent on the first uplink carrier or on the second uplink carrier, including: if the first downlink carrier is If the reference signal received power is greater than or equal to the first power threshold, the terminal device determines to send a random access request message on the first uplink carrier; if the reference signal received power of the first downlink carrier is less than the first power threshold, Then the terminal device determines to send a random access request message on the second uplink carrier.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a second power threshold value when the terminal device sends a random access request message on the second uplink carrier.
- the terminal device determines, according to the reference signal received power of the first downlink carrier and the power threshold information of the PRACH, that the random access request message is sent on the first uplink carrier or on the second uplink carrier, including: if the reference of the first downlink carrier If the received power of the signal is greater than or equal to the second power threshold, the terminal device determines to send a random access request message on the second uplink carrier; if the reference signal received power of the first downlink carrier is less than the second power threshold, The terminal device determines to transmit a random access request message on the first uplink carrier.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH includes a third power threshold value when the terminal device sends the random access request message on the second uplink carrier, and a path loss offset value between the second uplink carrier and the first uplink carrier.
- the terminal device determines, according to the reference signal received power of the first downlink carrier and the power threshold information of the PRACH, that the random access request message is sent on the first uplink carrier or on the second uplink carrier, including: if the reference of the first downlink carrier The signal receiving power + the path loss offset value - the third power threshold value ⁇ 0, the terminal device determines to send the random access request message on the second uplink carrier; if the reference signal receiving power of the first downlink carrier + path loss The offset value - the third power threshold ⁇ 0, the terminal device determines to send a random access request message on the first uplink carrier.
- the second information further includes power threshold information of the PRACH, and the power threshold information of the PRACH is the third information.
- the determining, by the terminal device, the sending the random access request message on the first uplink carrier or the second uplink carrier includes: determining, by the terminal device, sending the random access request message on the second uplink carrier according to the third information.
- the terminal device sends the random access request message on the first uplink carrier or the second uplink carrier, where the terminal device determines by using the first information.
- a random access request message is sent to the network device by using the resource on the first uplink carrier or the resource on the second uplink carrier determined according to the second information.
- the terminal device sends an RRC connection request message on the first uplink carrier or on the second uplink carrier.
- the terminal device receives the RRC connection configuration message sent by the network device on the first downlink carrier.
- the embodiment of the present application provides a random access method, where the method includes: the network device sends a system message to the terminal device on the first downlink carrier, where the network device is on the first uplink carrier or on the second uplink carrier. Receiving a random access request message sent by the terminal device, the network device sends a random access response message to the terminal device on the first downlink carrier.
- the first information includes a center frequency, a bandwidth, and PRACH resource configuration information of the first uplink carrier
- the second information includes a center frequency of the second uplink carrier, Bandwidth and PRACH resource configuration information.
- the second information further includes power threshold information of the PRACH.
- the power threshold information of the PRACH is the third information, where the third information is used to indicate that the terminal device sends the random access request message on the second uplink carrier.
- the power threshold information of the PRACH is a first power threshold that is set by the network device for the terminal device when the random access request message is sent on the first uplink carrier. value.
- the power threshold information of the PRACH is a second power threshold that is set by the network device for the terminal device when the random access request message is sent on the second uplink carrier. value.
- the power threshold information of the PRACH includes a third power threshold value and a path loss offset value, where the third power threshold value is set by the network device for the terminal device. And a power threshold value when the random access request message is sent on the second uplink carrier, where the path loss offset value is a path loss offset value between the second uplink carrier and the first uplink carrier.
- the system message further includes the access indication information, where the access indication information is used to indicate that the terminal device sends the random access request message on the second uplink carrier.
- the embodiment of the present application provides a terminal device, where the terminal device may include a receiving module and a sending module.
- the receiving module is configured to receive a system message sent by the network device on the first downlink carrier, where the sending module is configured to send a random access request message on the first uplink carrier or on the second uplink carrier, where the receiving module is further configured to receive the network.
- the first information includes a center frequency of the first uplink carrier, a bandwidth, and physical random access channel (PRACH) resource configuration information, where the second information includes the second uplink carrier.
- PRACH physical random access channel
- the terminal device further includes a processing module.
- the processing module is configured to determine to send a random access request message on the first uplink carrier or on the second uplink carrier.
- the processing module is specifically configured to determine, according to the second information included in the system message, that the random access request message is sent on the second uplink carrier.
- the system message further includes access indication information, where the access indication information is used to indicate that the terminal device sends the random access request message on the second uplink carrier; Specifically, the terminal device determines, according to the access indication information, that the random access request message is sent on the second uplink carrier.
- the second information further includes power threshold information of the PRACH.
- the processing module is specifically configured to: according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH, determine to send a random access request message on the first uplink carrier or on the second uplink carrier.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a first power threshold value when the terminal device sends a random access request message on the first uplink carrier.
- the processing module is specifically configured to: if the reference signal received power of the first downlink carrier is greater than or equal to the first power threshold, determine to send a random access request message on the first uplink carrier; if the first downlink carrier is referenced If the signal received power is less than the first power threshold, it is determined that the random access request message is sent on the second uplink carrier.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a second power threshold value when the terminal device sends a random access request message on the second uplink carrier.
- the processing module is specifically configured to: if the reference signal received power of the first downlink carrier is greater than or equal to the second power threshold, determine to send a random access request message on the second uplink carrier; if the first downlink carrier is referenced If the signal received power is less than the second power threshold, it is determined that the random access request message is sent on the first uplink carrier.
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH includes a third power threshold value when the terminal device sends the random access request message on the second uplink carrier, and a path loss offset value between the second uplink carrier and the first uplink carrier.
- the processing module is specifically configured to: if the reference signal received power of the first downlink carrier + the path loss offset value - the third power threshold value ⁇ 0, determine to send a random access request message on the second uplink carrier; A reference signal received power + path loss offset value - third power threshold ⁇ 0 of a downlink carrier determines to send a random access request message on the first uplink carrier.
- the second information further includes power threshold information of the PRACH, the power threshold information of the PRACH is the third information, and the third information is used to indicate that the terminal device is in the second uplink.
- the random access request message is sent on the carrier; the processing module is specifically configured to: the terminal device determines, according to the third information, that the random access request message is sent on the second uplink carrier.
- the sending module is specifically configured to: determine, by using, according to the first information, resources on the first uplink carrier, or by determining, according to the second information, The resource on the second uplink carrier sends a random access request message to the network device.
- an embodiment of the present application provides a network device, where the network device includes a sending module and a receiving module.
- the sending module is configured to send a system message to the terminal device on the first downlink carrier
- the receiving module is configured to receive the random access request message sent by the terminal device on the first uplink carrier or on the second uplink carrier, where the sending module further uses And transmitting a random access response message to the terminal device on the first downlink carrier.
- the first information includes a center frequency of the first uplink carrier, a bandwidth, and physical random access channel (PRACH) resource configuration information, where the second information includes the second uplink carrier.
- PRACH physical random access channel
- the second information further includes power threshold information of the PRACH.
- the power threshold information of the PRACH is the third information, where the third information is used to indicate that the terminal device sends the random access request message on the second uplink carrier.
- the power threshold information of the PRACH is a first power threshold that is set by the network device for the terminal device when the random access request message is sent on the first uplink carrier. value.
- the power threshold information of the PRACH is a second power threshold that is set by the network device for the terminal device when the random access request message is sent on the second uplink carrier. value.
- the power threshold information of the PRACH includes a third power threshold value and a path loss offset value, where the third power threshold is set by the network device for the terminal device. And a power threshold value when the random access request message is sent on the second uplink carrier, where the path loss offset value is a path loss offset value between the second uplink carrier and the first uplink carrier.
- system message further includes access indication information, where the access indication information is used to indicate that the terminal device sends the random access request message on the second uplink carrier.
- an embodiment of the present application provides a terminal device, where the terminal device includes a processor, a memory, and a transceiver, where the memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is configured to execute instructions stored in the memory. To cause the terminal device to perform the method of the above first aspect.
- an embodiment of the present application provides a network device, where the network device includes a processor, a memory, and a transceiver, where the memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is configured to execute instructions stored in the memory. To cause the terminal device to perform the method of the second aspect described above.
- the system message includes a random access required by the first uplink carrier
- the first information, and the second information required for the second uplink carrier random access the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, and the frequency of the first downlink carrier is the same as the frequency of the first uplink carrier.
- an embodiment of the present application provides a program, when executed by a processor, is configured to perform the method of the foregoing first aspect.
- an embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the seventh aspect.
- the embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the method of the first aspect.
- the embodiment of the present application provides a program, when executed by a processor, is used to execute the method of the second aspect.
- an embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the tenth aspect.
- the embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores instructions that, when run on a computer, cause the computer to perform the method of the second aspect.
- the embodiment of the present application provides a random access method, a network device, and a terminal device.
- the network device sends a system message to the terminal device on the first downlink carrier, by carrying the first information required for random access of the first uplink carrier and the second required for random access of the second uplink carrier in the system message.
- Information the terminal device may obtain second information that is randomly accessed by the second uplink carrier. Therefore, the terminal device can complete the random access not only on the first uplink carrier but also on the second uplink carrier. Since the frequency of the second uplink carrier is lower than the frequency of the first uplink carrier, the random access success rate is improved, and the uplink coverage performance of the network device is improved. And the program also increases the flexibility of spectrum partitioning and the efficiency of the use of fragmented spectrum.
- FIG. 1 is a network architecture diagram applicable to an embodiment of the present application
- FIG. 3 is a flowchart of a random access method according to an embodiment of the present application.
- FIG. 4 is a schematic structural diagram of a terminal device according to Embodiment 1 of the present application.
- FIG. 5 is a schematic structural diagram of a network device according to Embodiment 1 of the present application.
- FIG. 6 is a schematic structural diagram of a terminal device according to Embodiment 2 of the present application.
- FIG. 7 is a schematic structural diagram of a network device according to Embodiment 2 of the present application.
- FIG. 1 is a network architecture diagram applicable to an embodiment of the present application.
- the system includes a network device and a terminal device, and the network device has a certain signal coverage. Within the signal coverage, the network device is configured with an uplink carrier and a downlink carrier.
- the terminal device can send data and control signaling to the network device by using the time-frequency resource of the uplink carrier.
- the network device can send data and control signaling to the terminal device through the time-frequency resource of the downlink carrier.
- carrier F2 is an uplink carrier
- carrier F1 is an uplink carrier and a downlink carrier.
- the frequency of the carrier F2 is lower than the frequency of the carrier F1, and the carrier F2 has lower channel fading and better coverage.
- the carrier F2 may be an LTE band carrier, and the frequency band may be 1.8 GHz.
- Carrier F1 can be an NR-band carrier and the frequency band can be 3.5 GHz.
- the random access method provided by the embodiment of the present application is to solve the technical problem that the terminal device cannot perform random access on the low frequency uplink carrier when the user equipment can only use the low frequency uplink carrier and the high frequency uplink and downlink carrier in the prior art. .
- Synchronization signal The network device periodically sends a synchronization signal on F1, wherein the synchronization signal may include a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), and the terminal device may detect the synchronization signal.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- System message The network device periodically broadcasts system messages on F1.
- the system message may include random access information.
- the random access information is specifically the required random access information for accessing F1, and the system message sent on F1 does not include the random access information required for accessing F2.
- the random access information may include a random access pilot code sequence number and a configuration index for transmitting a physical random access channel (Physical Random Access Channel, PRACH).
- PRACH Physical Random Access Channel
- Msgl The terminal device determines, according to the time-frequency resource configuration of the transmitted PRACH in the system message, the resource that sends the random access request on the F1 uplink carrier, and sends a random access request message to the network device.
- the random access request message may include a resource random access sequence determined according to the random access pilot code sequence number in the system message.
- Msg2 The network device sends a random access response message to the terminal device on the F1 downlink carrier according to Msg1.
- the random access response message may include a Time Advance (TA) corresponding to F1.
- TA Time Advance
- the TA is used by the terminal device to determine the timing relationship of the uplink transmission.
- Msg3 The terminal device adjusts its own TA according to Msg2, and transmits an RRC Connection Request message (RRC Connection Request) to the network device.
- Msg4 The network device sends an RRC Connection Configuration message to the terminal device to complete the entire random access procedure.
- the random access method provided by the embodiment of the present application may randomly acquire the F1 uplink carrier and the F2 uplink carrier by using the F1 uplink carrier and the F2 uplink carrier random access information carried in the system message sent by the network device on the F1 downlink carrier.
- the access information is notified to the terminal device. Therefore, the terminal device can complete random access on the F2 uplink carrier according to the random access information of the F2 uplink carrier.
- the terminal device in the embodiment of the present application may be a wireless terminal such as a mobile phone or a tablet computer, and the wireless terminal includes a device for providing voice and/or data services to the user, and the terminal device may also be a handheld device with an wireless connection function and an in-vehicle device.
- the embodiment of the present application is not limited to a device, a computing device, and a user equipment UE, a mobile station (MS), and a terminal.
- the network device involved in the embodiment of the present application may be any device that manages wireless network resources in any of the 5G communication system and other communication systems.
- the network device may be a 5G base station (g Node B, gNB) in a 5G communication system, or a radio transceiver (NeXt Node, NX) in a 5G communication system, which is not limited in this embodiment.
- FIG. 3 is a flowchart of a random access method according to an embodiment of the present application. As shown in FIG. 3, the random access method provided in this embodiment of the present application may include:
- the network device sends a system message to the terminal device on the first downlink carrier.
- the system message may include first information required for random access of the first uplink carrier and second information required for random access of the second uplink carrier, where a frequency of the first uplink carrier is greater than a frequency of the second uplink carrier,
- the first downlink carrier has the same frequency as the first uplink carrier.
- the terminal device can receive the system message sent by the network device on the first downlink carrier.
- the network device can be configured with one downlink carrier and two uplink carriers.
- the one downlink carrier may be referred to as a first downlink carrier.
- the two uplink carriers may be referred to as a first uplink carrier and a second uplink carrier.
- the first downlink carrier has the same frequency as the first uplink carrier, and the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier.
- the network device can be configured with two carriers (F1 and F2).
- One of the carriers (F1) can be used for uplink information transmission and downlink information transmission, and can be referred to as a first uplink carrier and a first downlink carrier according to the transmission direction.
- the other carrier (F2) is only used for uplink information transmission and may be referred to as a second uplink carrier. Since the frequency of the second uplink carrier is low, the second uplink carrier has lower channel fading and larger uplink coverage than the first uplink carrier.
- the network device sends a system message to the terminal device on the first downlink carrier, where the system message includes the first information randomly accessed on the first uplink carrier, and the second uplink is also included.
- the second information randomly accessed on the carrier In this way, the network device notifies the terminal device of the random access information of the second uplink carrier, and may enable the terminal device to initiate random access on the second uplink carrier according to the second information.
- the first information includes necessary information that the terminal device needs to obtain when the first uplink carrier initiates random access. Through the first information, the terminal device can be caused to determine resources on the first uplink carrier.
- the second information includes necessary information that the terminal device needs to obtain when the second uplink carrier initiates random access. Through the second information, the terminal device can be caused to determine resources on the second uplink carrier.
- the implementation manner of the first information is not limited, and may be random access information of the first uplink carrier carried in the system message sent by the existing downlink carrier.
- the first information may include a center frequency point, a bandwidth, and PRACH resource configuration information of the first uplink carrier.
- the PRACH resource configuration information may include a PRACH configuration index.
- the implementation of the second information is not limited in this embodiment, and may be similar to the random access information of the first uplink carrier carried in the system message sent on the first downlink carrier.
- the second information may include a center frequency, a bandwidth, and PRACH resource configuration information of the second uplink carrier.
- the PRACH resource configuration information may include a PRACH configuration index.
- the system information may further include access indication information.
- the access indication information is used to instruct the terminal device to send a random access request message on the second uplink carrier.
- the indication may be indicated by configuring different values of the access indication information. For example, when the access indication information is configured to be "1", the network device instructs the terminal device to send a random access request message on the second uplink carrier.
- the indication information indicating the target carrier may be indicated by the access indication information.
- the network device instructs the terminal device to send a random access request message on the second uplink carrier.
- the indication may be indicated by whether the access indication information is included in the system message.
- the network device instructs the terminal device to send a random access request message on the second uplink carrier.
- the second information may further include power threshold information of the PRACH.
- the power threshold information of the PRACH is set by the network device for the terminal device, and is used by the terminal device to determine whether to initiate random access on the first uplink carrier or random access on the second uplink carrier.
- the power threshold information of the PRACH may be a first power threshold that is set by the network device for the terminal device when the random access request message is sent on the first uplink carrier.
- the power threshold information of the PRACH may be a second power threshold that is set by the network device for the terminal device when the random access request message is sent on the second uplink carrier.
- the power threshold information of the PRACH may include a third power threshold and a path loss offset value, where the third power threshold may be set by the network device for the terminal device, and the random access is sent on the second uplink carrier.
- the power threshold value when the message is requested, and the path loss offset value may be a path loss offset value between the second uplink carrier and the first uplink carrier.
- the power threshold information of the PRACH may be the third information.
- the third information is used to instruct the terminal device to initiate random access on the second uplink carrier.
- the third information may be directly an indication information or a special value.
- the terminal device determines, according to the third information, that the random access is initiated on the second uplink carrier. If the power threshold information of the PRACH is not the third information, for example, the power threshold information of the PRACH is a certain power threshold, the terminal device may determine according to the power threshold to determine which uplink carrier is selected to initiate a random Access.
- the power threshold may be the foregoing first power threshold or the second power threshold, and specific implementations based on the power thresholds are described in detail later.
- the specific values of the first power threshold, the second power threshold, the third power threshold, and the path loss offset value are not limited in this embodiment.
- the value range of the first power threshold may include a value range of the reference signal received power of the terminal device. For example, if the reference signal receiving power of the terminal device ranges from [-110 dBm, -60 dBm], the first power threshold value ranges from [-110 dBm, -60 dBm].
- system message may further include public random access information.
- the first information may be information related to the first uplink carrier when the first uplink carrier is randomly accessed
- the second information may be information related to the second uplink carrier when the second uplink carrier is randomly accessed.
- the public random access information may be random access information applicable to both the first uplink carrier random access and the second uplink carrier random access. This embodiment does not limit the implementation manner of the public random access information.
- the public random access information may include frequency hopping indication information or retransmission indication information.
- the terminal device sends a random access request message on the first uplink carrier or on the second uplink carrier.
- the network device may receive the random access request message sent by the terminal device on the first uplink carrier or on the second uplink carrier.
- a random access request message is usually sent only on one uplink carrier.
- the terminal device may be in the first uplink carrier, because the system message received by the terminal device includes the first information required for the first uplink carrier random access and the second information required for the second uplink carrier random access.
- a random access request message is sent on or on the second uplink carrier. If the terminal device sends a random access request message on the first uplink carrier, the network device may receive the random access request message sent by the terminal device on the first uplink carrier. If the terminal device sends a random access request message on the second uplink carrier, the network device may receive the random access request message sent by the terminal device on the second uplink carrier.
- the network device has a certain signal coverage, and there may be more than one terminal device that communicates with the network device within the signal coverage. Therefore, for a case where a plurality of terminal devices communicate with the network device, the network device may receive a random access request message sent by each terminal device on the first uplink carrier and on the second uplink carrier.
- the terminal device sends the random access request message on the first uplink carrier or the second uplink carrier, which may include:
- the terminal device sends a random access request message to the network device by using the resource on the first uplink carrier determined according to the first information or by using the resource on the second uplink carrier determined according to the second information.
- the method for determining, by the terminal device, the resource on the first uplink carrier according to the first information, and determining the resource on the second uplink carrier according to the second information is not limited in this embodiment, and the existing random connection may be adopted. Any method of determining resources in the process.
- the terminal device may be configured according to the PRACH configuration index, the center frequency of the first uplink carrier, and the bandwidth of the first uplink carrier.
- the resource for transmitting the random access request message is determined on the time-frequency resource.
- the terminal device may be configured according to the PRACH configuration index, the center frequency of the second uplink carrier, and the bandwidth of the second uplink carrier.
- the resource for transmitting the random access request message is determined on the time-frequency resource.
- the specific information included in the random access request message is not limited in this embodiment, and may be the same as the information included in the existing random access request message.
- the random access request message may include a random access sequence.
- the network device sends a random access response message to the terminal device on the first downlink carrier.
- the terminal device can receive the random access response message sent by the network device on the first downlink carrier.
- the random access response message may include a TA. It should be noted that if the terminal device sends a random access request message on the first uplink carrier, the TA corresponds to the first uplink carrier. If the terminal device sends a random access request message on the second uplink carrier, the TA corresponds to the second uplink carrier.
- the network device sends the information to the terminal device on the first downlink carrier.
- the system message may be used to obtain random access information of two uplink carriers by using the first information required for random access of the first uplink carrier and the second information required for random access of the second uplink carrier carried in the system message. Also sent to the terminal device. Thereby, the terminal device can obtain the necessary information for initiating random access on the second uplink carrier, and complete random access on the second uplink carrier.
- the frequency of the second uplink carrier is lower than the frequency of the first uplink carrier, so that the random access is initiated on the second uplink carrier, the random access success rate is improved, and the uplink coverage performance of the network device is improved.
- the random access method provided in this embodiment may further include:
- the terminal device sends an RRC connection request message on the first uplink carrier or on the second uplink carrier.
- the network device receives the RRC connection request message sent by the terminal device on the first uplink carrier or on the second uplink carrier.
- the terminal device may send an RRC connection request message on the first uplink carrier or on the second uplink carrier. It should be noted that, in a case that a plurality of terminal devices communicate with the network device, the network device may receive an RRC connection request message sent by each terminal device on the first uplink carrier and on the second uplink carrier.
- the network device sends an RRC connection configuration message to the terminal device on the first downlink carrier.
- the terminal device can receive an RRC connection configuration message sent by the network device on the first downlink carrier.
- RRC connection request message and the RRC connection configuration message is not limited in this embodiment, and may be the same as the RRC message in the existing access procedure.
- the method may further include:
- the terminal device determines to transmit a random access request message on the first uplink carrier or on the second uplink carrier.
- the determining, by the terminal device, that the random access request message is sent on the first uplink carrier or the second uplink carrier may include:
- the terminal device determines to send a random access request message on the second uplink carrier according to the second information included in the system message.
- the second uplink carrier since the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, the second uplink carrier generally has lower channel fading and better uplink coverage than the first uplink carrier. The coverage of the second uplink carrier will be greater than the coverage of the first uplink carrier. At a particular location within the signal coverage of the network device, the power of the second uplink carrier is typically greater than the power of the first uplink carrier. Therefore, if the system message includes the second information required for the second uplink carrier random access, the terminal device may directly determine to send the random access request message on the second uplink carrier. The determination process is simple, the time of random access is shortened, and the success rate of random access is improved.
- the determining, by the terminal device, the sending the random access request message on the first uplink carrier or the second uplink carrier may include:
- the terminal device determines to send a random access request message on the second uplink carrier according to the access indication information.
- the second uplink carrier since the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, the second uplink carrier generally has lower channel fading and better uplink coverage than the first uplink carrier. The coverage of the second uplink carrier will be greater than the coverage of the first uplink carrier.
- the network device may directly instruct the terminal device to send the random access request message on the second uplink carrier by using the access indication information.
- the terminal device directly determines to send a random access request message on the second uplink carrier according to the access indication information. The determination process is simple, the time of random access is shortened, and the success rate of random access is improved.
- the terminal device determines to send the random access request message on the first uplink carrier or on the second uplink carrier, which may include :
- the terminal device determines to send a random access request message on the first uplink carrier or on the second uplink carrier according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH.
- the uplink power attenuation and the downlink power attenuation have a certain correspondence, and the power attenuation in one transmission direction may reflect the power attenuation in the other transmission direction.
- the information about the received power of the first downlink carrier is the actual value of the downlink power obtained by the terminal device, and reflects the power attenuation level of the first downlink carrier.
- the terminal device can obtain the power attenuation of the first uplink carrier by referring to the information about the received power of the first downlink carrier.
- the implementation manner of the information about the received power of the first downlink carrier is not limited in this embodiment.
- the information about the received power of the first downlink carrier may be Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).
- the power threshold information of the PRACH reflects the minimum power conditions that need to be met during the random access procedure. Therefore, according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH, whether the first uplink carrier or the second uplink carrier satisfies the random access condition can be determined. In this way, selecting a better uplink carrier to send a random access request message in the first uplink carrier and in the second uplink carrier can further improve the random access success rate.
- the power threshold information of the PRACH is that the terminal device sends the random number on the first uplink carrier.
- the first power threshold of the access request message the terminal device determines to send the random on the first uplink carrier or the second uplink carrier according to the information about the received power of the first downlink carrier and the power threshold information of the PRACH.
- the access request message may include:
- the terminal device determines to send a random access request message on the first uplink carrier
- the terminal device determines to send a random access request message on the second uplink carrier.
- the first power threshold is configured by the network device.
- the configuration of the first power threshold is not limited in this embodiment.
- the first power threshold may reflect a minimum power requirement that needs to be met when the random access request message is sent on the first uplink carrier. If the reference signal received power of the first downlink carrier is greater than or equal to the first power threshold, the first uplink carrier may meet the random access condition, and the terminal device may send a random access request message on the first uplink carrier. It is not necessary to send a random access request message on the second uplink carrier with a better power level. If the reference signal received power of the first downlink carrier is less than the first power threshold, the first uplink carrier cannot meet the random access condition, and the terminal device can send the random access on the second uplink carrier with the better power level. Request message.
- the first power threshold may be set to be greater than the reference signal received power of the terminal device, for example, the first power threshold may be positive infinity or greater than the reference signal received power maximum of the terminal device. Any value.
- the power threshold information of the PRACH is that the terminal device sends the random on the second uplink carrier.
- the second power threshold of the access request message the terminal device determines to send the random connection on the first uplink carrier or the second uplink carrier according to the reference signal received power of the first downlink carrier and the power threshold information of the PRACH.
- the incoming request message may include:
- the terminal device determines to send a random access request message on the second uplink carrier
- the terminal device determines to send a random access request message on the first uplink carrier.
- the second power threshold is configured by the network device, and the configuration manner of the second power threshold is not limited in this embodiment.
- the second power threshold may reflect a minimum power requirement, a path loss offset value, and a network device selection tendency of the random access carrier when the random access request message is sent on the second uplink carrier. If the reference signal received power of the first downlink carrier is greater than or equal to the second power threshold, the terminal device may send a random access request message on the second uplink carrier. If the reference signal received power of the first downlink carrier is less than the second power threshold, the terminal device may send a random access request message on the first uplink carrier.
- the power threshold information of the PRACH includes the terminal device sending the random on the second uplink carrier.
- the threshold information, the determining that the random access request message is sent on the first uplink carrier or the second uplink carrier may include:
- the terminal device determines to send a random access request message on the second uplink carrier
- the terminal device determines to send a random access request message on the first uplink carrier.
- the third power threshold is configured by the network device, and the configuration manner of the third power threshold is not limited in this embodiment.
- the third power threshold may reflect a minimum power requirement that needs to be met when the random access request message is sent on the second uplink carrier, and a network device selection tendency of the random access carrier.
- the path loss offset value between the second uplink carrier and the first uplink carrier is a difference between the path loss value of the second uplink carrier and the path loss value of the first uplink carrier, and the path loss value is measured in this embodiment.
- the configuration method is not limited. If the sum of the reference signal received power of the first downlink carrier and the path loss offset value is greater than or equal to the third power threshold, the terminal device may send a random access request message on the second uplink carrier. If the sum of the reference signal received power of the first downlink carrier and the path loss offset value is less than the third power threshold, the terminal device may send a random access request message on the first uplink carrier.
- Sending a random access request message may include:
- the terminal device determines to send a random access request message on the second uplink carrier according to the third information.
- the third information may be used as an indication information, where the indication information indicates that the terminal device does not need to determine the size between the reference signal received power of the first downlink carrier and any power threshold, and determines that the random transmission is sent from the second uplink carrier. Access request message.
- the determination process is simple, the time of random access is shortened, and the success rate of random access is improved.
- the embodiment of the present application provides a random access method, including: the network device sends a system message to the terminal device on the first downlink carrier, where the system message includes the first information required for random access in the first uplink carrier, and The second information required for the second uplink carrier random access, the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, and the frequency of the first downlink carrier is the same as the frequency of the first uplink carrier.
- the terminal device sends a random access request message on the first uplink carrier or the second uplink carrier.
- the network device sends a random access response message to the terminal device on the first downlink carrier.
- the terminal device may complete a random access procedure on any uplink carrier, thereby improving The random access success rate improves the uplink coverage performance of network devices.
- FIG. 4 is a schematic structural diagram of a terminal device according to Embodiment 1 of the present application.
- the terminal device provided by the embodiment of the present application is configured to perform the operations performed by the terminal device in the random access method provided by the embodiment shown in FIG.
- the terminal device provided by the embodiment of the present application may include:
- the receiving module 11 is configured to receive a system message sent by the network device on the first downlink carrier.
- the system message includes first information required for random access of the first uplink carrier, and second information required for random access of the second uplink carrier, where the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, first The downlink carrier is the same frequency as the first uplink carrier.
- the sending module 12 is configured to send a random access request message on the first uplink carrier or on the second uplink carrier.
- the receiving module 11 is further configured to receive a random access response message sent by the network device on the first downlink carrier.
- the first information includes: a center frequency of the first uplink carrier, a bandwidth, and PRACH resource configuration information.
- the second information includes: a center frequency point, a bandwidth, and PRACH resource configuration information of the second uplink carrier.
- processing module 13 is further included, and the processing module 13 is configured to:
- processing module 13 is specifically configured to:
- the system message further includes access indication information, where the access indication information is used to instruct the terminal device to send a random access request message on the second uplink carrier.
- the processing module 13 is specifically configured to:
- the terminal device determines to send a random access request message on the second uplink carrier according to the access indication information.
- the second information further includes power threshold information of the PRACH.
- the processing module 13 is specifically configured to:
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a first power threshold value when the terminal device sends a random access request message on the first uplink carrier.
- the processing module 13 is specifically configured to:
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH is a second power threshold value when the terminal device sends a random access request message on the second uplink carrier.
- the processing module 13 is specifically configured to:
- the information about the received power of the first downlink carrier is the reference signal received power of the first downlink carrier.
- the power threshold information of the PRACH includes a third power threshold value when the terminal device sends the random access request message on the second uplink carrier, and a path loss offset value between the second uplink carrier and the first uplink carrier.
- the processing module 13 is specifically configured to:
- the reference signal received power of the first downlink carrier + the path loss offset value - the third power threshold value ⁇ 0 it is determined that the random access request message is sent on the first uplink carrier.
- the power threshold information of the PRACH is the third information, where the third information is used to instruct the terminal device to send the random access request message on the second uplink carrier.
- the processing module 13 is specifically configured to:
- the terminal device determines to send a random access request message on the second uplink carrier according to the third information.
- the sending module 12 is specifically configured to:
- the random access request message is sent to the network device by the resource on the first uplink carrier determined according to the first information or by the resource on the second uplink carrier determined according to the second information.
- the terminal device provided by the embodiment of the present application is used to perform the operations performed by the terminal device in the method embodiment shown in FIG. 3, and the technical principles and technical effects thereof are similar, and details are not described herein again.
- FIG. 5 is a schematic structural diagram of a network device according to Embodiment 1 of the present application.
- the network device provided by the embodiment of the present application is used to perform the operations performed by the network device in the random access method provided by the embodiment shown in FIG.
- the network device provided in this embodiment of the present application may include:
- the sending module 21 is configured to send a system message to the terminal device on the first downlink carrier, where the system message includes the first information required for random access in the first uplink carrier and the first required for random access in the second uplink carrier In the second information, the frequency of the first uplink carrier is greater than the frequency of the second uplink carrier, and the frequency of the first downlink carrier is the same as the frequency of the first uplink carrier.
- the receiving module 22 is configured to receive a random access request message sent by the terminal device on the first uplink carrier or on the second uplink carrier.
- the sending module 21 is further configured to send a random access response message to the terminal device on the first downlink carrier.
- the first information includes: a center frequency point of the first uplink carrier, a bandwidth, and physical random access channel PRACH resource configuration information.
- the second information includes: a center frequency point, a bandwidth, and PRACH resource configuration information of the second uplink carrier.
- the second information further includes power threshold information of the PRACH.
- the power threshold information of the PRACH is the third information, where the third information is used to instruct the terminal device to send the random access request message on the second uplink carrier.
- the power threshold information of the PRACH is a first power threshold value that is set by the network device for the terminal device when the random access request message is sent on the first uplink carrier.
- the power threshold information of the PRACH is a second power threshold value that is set by the network device for the terminal device when the random access request message is sent on the second uplink carrier.
- the power threshold information of the PRACH includes a third power threshold value and a path loss offset value, where the third power threshold value is set by the network device for the terminal device, and the random access request message is sent on the second uplink carrier.
- the power threshold value at the time, the path loss offset value is a path loss offset value between the second uplink carrier and the first uplink carrier.
- the system message further includes access indication information, where the access indication information is used to instruct the terminal device to send a random access request message on the second uplink carrier.
- the network device provided by the embodiment of the present application is used to perform the operations performed by the network device in the method embodiment shown in FIG. 3, and the technical principles and technical effects thereof are similar, and details are not described herein again.
- FIG. 6 is a schematic structural diagram of a terminal device according to Embodiment 2 of the present application.
- the terminal device includes a processor 31, a memory 32, and a transceiver 33.
- the memory 32 is configured to store an instruction
- the processor 31 is configured to execute instructions stored in the memory 32, so that the terminal device performs operations performed by the terminal device in the embodiment shown in FIG. 3, and the specific implementation manner and technology The effect is similar and will not be described here.
- FIG. 7 is a schematic structural diagram of a network device according to Embodiment 2 of the present application.
- the network device includes a processor 41, a memory 42 and a transceiver 43.
- the memory 42 is configured to store an instruction, the transceiver. 43 for communicating with other devices, the processor 41 is configured to execute instructions stored in the memory 42 to enable the network device to perform operations performed by the network device in the embodiment shown in FIG. 3, and the specific implementation and technology The effect is similar and will not be described here.
- the processor used by the network device or the terminal device in the present application may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), and a field programmable gate array (FPGA). Or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
- the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
- the aforementioned program can be stored in a computer readable storage medium.
- the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
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Abstract
本申请实施例提供一种随机接入方法、网络设备和终端设备。其中,随机接入方法包括:终端设备接收网络设备在第一下行载波上发送的***消息,***消息包括在第一上行载波随机接入所需的第一信息,以及在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同;终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息;终端设备接收网络设备在第一下行载波上发送的随机接入响应消息。本申请实施例提供的随机接入方法,终端设备可以在第一上行载波或第二上行载波上完成随机接入,提升了随机接入成功率,提升网络设备的上行覆盖性能。
Description
本申请要求于2017年09月30日提交中国专利局、申请号为201710939568.3、申请名称为《随机接入方法、网络设备和终端设备》的中国专利申请的优先权,以及要求于2017年05月05日提交中国专利局、申请号为201710314210.1、申请名称为《随机接入方法、网络设备和终端设备》的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请实施例涉及通信技术领域,尤其涉及一种随机接入方法、网络设备和终端设备。
目前,长期演进(Long Term Evolution,LTE)及其演进***(LTE Advanced,LTE-A)在全球中广泛部署,并且将在较长时间内为用户提供通信服务。而第五代通信***(5th-Generation,5G)的新无线接入技术(New Radio Access Technology,NR)的标准制定正在进行,并预计将在2018年左右开始投入商用。因此,LTE与NR共存的场景在未来较长的一段时间内将会存在。在NR的研究项目中,亦包含了LTE与NR共存场景的技术研究。
部署LTE小区和NR小区时,NR小区部署在高频频段,LTE小区部署在低频频段。例如,NR小区的的一个重要部署频段为3.5GHz,而LTE小区的一个重要部署频段为1.8GHz。其中,NR使用的是以为时分双工(Time Division Duplexing,TDD)方式工作的非对称载波F1,LTE使用的是以频分双工(Frequency Division Duplexing,FDD)方式工作的对称载波F2。由于LTE目前上行的频谱利用率不高,而且,1.8GHz频段相比于3.5GHz频段,1.8GHz频段具有更低的信道衰落和更好的覆盖,因此,可以让LTE的F2上行载波共享给5G NR的终端设备(User Equipment,UE)和LTE的UE共同使用进行上行传输,提升F2上行载波的频谱利用率,增强5G NR的上行覆盖能力。但LTE的F2下行载波不一定共享给5G NR的UE使用,因此NR UE只能在F1下行载波中进行下行传输,接收NR的下行信号。
UE需要进行随机接入,才能接入到无线网络***中,获得通信服务。目前,一个UE的发起随机接入流程可以简述如下。例如,工作中的小区总是在F1下行载波上周期性地发送同步信号和广播***信息。***信息中包括了在F1载波上进行随机接入所需要的信息。UE在各频段上开始搜索可能对其提供服务的小区,并选取一个目标小区进行初始随机接入。当UE从目标小区的F1下行载波上获取了随机接入信息后,UE在F1上行载波上发送随机接入请求进行随机接入。
由上述随机接入过程可以看出,UE只能在F1上行载波上进行随机接入,而无法在F2上行载波上进行随机接入。
发明内容
本申请实施例提供一种随机接入方法、网络设备和终端设备,可以实现在任意的上行载波上完成随机接入。
第一方面,本申请实施例提供一种随机接入方法,该方法包括:终端设备接收网络设备在第一下行载波上发送的***消息,终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息,终端设备接收网络设备在第一下行载波上发送的随机接入响应消息。
通过第一方面提供的随机接入方法,终端设备在第一下行载波上接收***消息。由于***消息中携带有在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,因此,终端设备不但可以在第一上行载波发起随机接入,由于可以获得第二上行载波发起随机接入的必要信息,因此也可以完成在第二上行载波上的随机接入。由于第二上行载波的频率低于第一上行载波的频率,因此可以通过在第二上行载波上发起随机接入,提升随机接入成功率,提升网络设备的上行覆盖性能。
可选的,在第一方面的一种可能的实施方式中,第一信息包括第一上行载波的中心频点、带宽和PRACH资源配置信息,第二信息包括第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,在第一方面的一种可能的实施方式中,终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息之前,该方法还包括:终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,包括:终端设备根据***消息中包括的第二信息,确定在第二上行载波上发送随机接入请求消息。
通过该可能的实施方式提供的随机接入方法,由于第一上行载波的频率大于第二上行载波的频率,第二上行载波相对于第一上行载波通常具有更低的信道衰落和更好的上行覆盖。若***消息中包括有在第二上行载波随机接入所需的第二信息时,终端设备可以直接确定在第二上行载波发送随机接入请求消息。确定过程简单,缩短了随机接入的时间,提升了随机接入成功率。
可选的,在第一方面的一种可能的实施方式中,***消息还包括接入指示信息。终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,包括:终端设备根据***消息中包括的接入指示信息,确定在第二上行载波上发送随机接入请求消息。
通过该可能的实施方式提供的随机接入方法,由于第一上行载波的频率大于第二上行载波的频率,第二上行载波相对于第一上行载波通常具有更低的信道衰落和更好的上行覆盖。当第二上行载波负载较小、随机接入请求消息碰撞概率较低时,网络设备可以直接指示终端设备在第二上行载波发送随机接入请求消息,过程简单,缩短了随机接入的时间,提升了随机接入成功率。
可选的,在第一方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息。终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消 息,包括:终端设备根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息。
通过该可能的实施方式提供的随机接入方法,终端设备根据第一下行载波的接收功率的信息和PRACH的功率门限信息,可以准确确定第一上行载波或者第二上行载波是否满足随机接入条件。在第一上行载波和在第二上行载波中选择一个信号更好的上行载波发送随机接入请求消息,可以进一步提升随机接入成功率。
可选的,在第一方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息为终端设备在第一上行载波上发送随机接入请求消息时的第一功率门限值。终端设备根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息,包括:若第一下行载波的参考信号接收功率大于或者等于第一功率门限值,则终端设备确定在第一上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率小于第一功率门限值,则终端设备确定在第二上行载波上发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息为终端设备在第二上行载波上发送随机接入请求消息时的第二功率门限值。终端设备根据第一下行载波的参考信号接收功率和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波发送随机接入请求消息,包括:若第一下行载波的参考信号接收功率大于或者等于第二功率门限值,则终端设备确定在第二上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率小于第二功率门限值,则终端设备确定在第一上行载波上发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息包括终端设备在第二上行载波上发送随机接入请求消息时的第三功率门限值,和第二上行载波与第一上行载波之间的路损偏移值。终端设备根据第一下行载波的参考信号接收功率和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波发送随机接入请求消息,包括:若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值≥0,则终端设备确定在第二上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值<0,则终端设备确定在第一上行载波上发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息,PRACH的功率门限信息为第三信息。终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,包括:终端设备根据第三信息,确定在第二上行载波发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息,包括:终端设备通过根据第一信息确定的、在第一上行载波上的资源,或者通过根据第二信息确定的、在第二上行载波上的资源,向网络设备发送随机接入请求消息。
可选的,在第一方面的一种可能的实施方式中,终端设备在第一上行载波上或在第二上行载波上发送RRC连接请求消息。
可选的,在第一方面的一种可能的实施方式中,终端设备在第一下行载波上接收网络设备发送的RRC连接配置消息。
第二方面,本申请实施例提供一种随机接入方法,该方法包括:网络设备在第一下行载波上向终端设备发送***消息,网络设备在第一上行载波上或者在第二上行载波上接收终端设备发送的随机接入请求消息,网络设备在第一下行载波上向终端设备发送随机接入响应消息。
可选的,在第二方面的一种可能的实施方式中,第一信息包括第一上行载波的中心频点、带宽和PRACH资源配置信息,第二信息包括第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,在第二方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息。
可选的,在第二方面的一种可能的实施方式中,PRACH的功率门限信息为第三信息,第三信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,在第二方面的一种可能的实施方式中,PRACH的功率门限信息为网络设备为终端设备设置的、在第一上行载波上发送随机接入请求消息时的第一功率门限值。
可选的,在第二方面的一种可能的实施方式中,PRACH的功率门限信息为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的第二功率门限值。
可选的,在第二方面的一种可能的实施方式中,PRACH的功率门限信息包括第三功率门限值和路损偏移值,第三功率门限值为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的功率门限值,路损偏移值为第二上行载波与第一上行载波之间的路损偏移值。
可选的,在第二方面的一种可能的实施方式中,***消息还包括接入指示信息,接入指示信息用于指示终端设备在所述第二上行载波上发送随机接入请求消息。
第三方面,本申请实施例提供一种终端设备,该终端设备可以包括接收模块和发送模块。接收模块用于接收网络设备在第一下行载波上发送的***消息,发送模块用于在第一上行载波上或在第二上行载波上发送随机接入请求消息,接收模块还用于接收网络设备在第一下行载波上发送的随机接入响应消息。
可选的,在第三方面的一种可能的实施方式中,第一信息包括第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息,第二信息包括第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,在第三方面的一种可能的实施方式中,该终端设备还包括处理模块。处理模块用于确定在第一上行载波上或在第二上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,处理模块具体用于,根据***消息中包括的第二信息,确定在第二上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,***消息还包括接入指示信息,接入指示信息用于指示终端设备在第二上行载波上发送随机接入请求消息;处理模块具体用于:终端设备根据接入指示信息,确定在第二上行载波上发送随机接入请求消 息。
可选的,在第三方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息。处理模块具体用于,根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息为终端设备在第一上行载波上发送随机接入请求消息时的第一功率门限值。处理模块具体用于,若第一下行载波的参考信号接收功率大于或者等于第一功率门限值,则确定在第一上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率小于第一功率门限值,则确定在第二上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息为终端设备在第二上行载波上发送随机接入请求消息时的第二功率门限值。处理模块具体用于,若第一下行载波的参考信号接收功率大于或者等于第二功率门限值,则确定在第二上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率小于第二功率门限值,则确定在第一上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。PRACH的功率门限信息包括终端设备在第二上行载波上发送随机接入请求消息时的第三功率门限值,和第二上行载波与第一上行载波之间的路损偏移值。处理模块具体用于,若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值≥0,则确定在第二上行载波上发送随机接入请求消息;若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值<0,则确定在第一上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息,PRACH的功率门限信息为第三信息,第三信息用于指示终端设备在第二上行载波上发送随机接入请求消息;处理模块具体用于:终端设备根据第三信息,确定在第二上行载波上发送随机接入请求消息。
可选的,在第三方面的一种可能的实施方式中,发送模块具体用于,通过根据第一信息确定的、在第一上行载波上的资源,或者通过根据第二信息确定的、在第二上行载波上的资源,向网络设备发送随机接入请求消息。
第四方面,本申请实施例提供一种网络设备,该网络设备包括发送模块和接收模块。发送模块用于在第一下行载波上向终端设备发送***消息,接收模块用于在第一上行载波上或者在第二上行载波上接收终端设备发送的随机接入请求消息,发送模块还用于在第一下行载波上向终端设备发送随机接入响应消息。
可选的,在第四方面的一种可能的实施方式中,第一信息包括第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息,第二信息包括第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,在第四方面的一种可能的实施方式中,第二信息还包括PRACH的功率门限信息。
可选的,在第四方面的一种可能的实施方式中,PRACH的功率门限信息为第三信息,第三信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,在第四方面的一种可能的实施方式中,PRACH的功率门限信息为网络设备为终端设备设置的、在第一上行载波上发送随机接入请求消息时的第一功率门限值。
可选的,在第四方面的一种可能的实施方式中,PRACH的功率门限信息为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的第二功率门限值。
可选的,在第四方面的一种可能的实施方式中,PRACH的功率门限信息包括第三功率门限值和路损偏移值,第三功率门限值为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的功率门限值,路损偏移值为第二上行载波与第一上行载波之间的路损偏移值。
可选的,在第四方面的一种可能的实施方式中,***消息还包括接入指示信息,接入指示信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
第五方面,本申请实施例提供一种终端设备,该终端设备包括处理器、存储器和收发器,存储器用于存储指令,收发器用于和其他设备通信,处理器用于执行存储器中存储的指令,以使终端设备执行上述第一方面的方法。
第六方面,本申请实施例提供一种网络设备,该网络设备包括处理器、存储器和收发器,存储器用于存储指令,收发器用于和其他设备通信,处理器用于执行存储器中存储的指令,以使终端设备执行上述第二方面的方法。
结合上述第一方面以及第一方面的各可能的实施方式、第二方面以及第二方面的各可能的实施方式、第三方面以及第三方面的各可能的实施方式、第四方面以及第四方面的各可能的实施方式、第五方面以及第五方面的各可能的实施方式、第六方面以及第六方面的各可能的实施方式,***消息包括在第一上行载波随机接入所需的第一信息,以及在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同。
第七方面,本申请实施例提供一种程序,该程序在被处理器执行时用于执行上述第一方面的方法。
第八方面,本申请实施例提供一种程序产品,例如计算机可读存储介质,包括第七方面的程序。
第九方面,本申请实施例提供一种计算机可读存储介质,所述计算机可读存储介质中存储有指令,当其在计算机上运行时,使得计算机执行上述第一方面的方法。
第十方面,本申请实施例提供一种程序,该程序在被处理器执行时用于执行上述第二方面的方法。
第十一方面,本申请实施例提供一种程序产品,例如计算机可读存储介质,包括第十方面的程序。
第十二方面,本申请实施例提供一种计算机可读存储介质,所述计算机可读存储介质中存储有指令,当其在计算机上运行时,使得计算机执行上述第二方面的方法。
本申请实施例提供一种随机接入方法、网络设备和终端设备。网络设备在第一下行载波上向终端设备发送***消息,通过在***消息中携带在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,终端设备可以获得在第 二上行载波随机接入的第二信息。从而,终端设备不但可以在第一上行载波完成随机接入,也可以在第二上行载波完成随机接入。由于第二上行载波的频率低于第一上行载波的频率,因此提升了随机接入成功率,提升了网络设备的上行覆盖性能。并且该方案还增加了频谱划分的灵活性,以及零碎频谱的利用效率。
图1为本申请实施例适用的网络架构图;
图2为现有的随机接入方法的流程图;
图3为本申请实施例提供的随机接入方法的流程图;
图4为本申请实施例一提供的终端设备的结构示意图;
图5为本申请实施例一提供的网络设备的结构示意图。
图6为本申请实施例二提供的终端设备的结构示意图;
图7为本申请实施例二提供的网络设备的结构示意图。
本申请实施例提供的随机接入方法,可以应用于5G通信***及其他通信***,只要通信***中存在上行载波数目与下行载波数目不相等,且上行载波数目大于下行载波数目的场景。图1为本申请实施例适用的网络架构图。如图1所示,***包括网络设备和终端设备,网络设备具有一定的信号覆盖范围。在信号覆盖范围内,网络设备配置有上行载波和下行载波。终端设备可以通过上行载波的时频资源向网络设备发送数据和控制信令。网络设备可以通过下行载波的时频资源向终端设备发送数据和控制信令。在图1中,载波F2为上行载波,载波F1为上行载波和下行载波。其中,载波F2的频率低于载波F1的频率,载波F2具有更低的信道衰落和更好的覆盖。在LTE与NR共存场景中,载波F2可以为LTE频段载波,频段可以为1.8GHz。载波F1可以为NR频段载波,频段可以为3.5GHz。
本申请实施例提供的随机接入方法,旨在解决目前现有技术中当用户设备仅能使用低频上行载波和高频上下行载波时终端设备无法在该低频上行载波进行随机接入的技术问题。
图2为现有的随机接入方法的流程图。对于图1所示场景,如图2所示,现有的随机接入方法过程如下。同步信号:网络设备在F1上周期性地发送同步信号,其中,同步信号可以包括主同步信号(Primary Synchronization Signal,PSS)和辅同步信号(Secondary Synchronization Signal,SSS),终端设备可以通过检测同步信号获知网络设备的ID、取得与网络设备之间的下行同步等。***消息:网络设备在F1上周期性地下行广播***消息。该***消息中可以包括随机接入信息。随机接入信息具体为接入F1的所需要的随机接入信息,在F1上发送的***消息中不包括接入F2所需要的随机接入信息。随机接入信息可以包括随机接入导频码序号和发送物理随机接入信道(Physical Random Access Channel,PRACH)的配置索引。Msgl:终端设备根据***消息中的发送PRACH的时频资源配置确定在F1上行载波上发送随机接入请求的资源, 向网络设备发送随机接入请求消息。随机接入请求消息中可以包括根据***消息中随机接入导频码序号确定的资源随机接入序列。Msg2:网络设备根据Msg1在F1下行载波上向终端设备发送随机接入响应消息。随机接入响应消息可以包括与F1对应的时间提前量(Time Advance,TA)。TA用于终端设备确定上行传输的定时关系。Msg3:终端设备根据Msg2调整自身的TA,向网络设备发送RRC连接请求消息(RRC Connection Request)。Msg4:网络设备向终端设备发送RRC连接配置消息(RRC Connection Configuration),完成整个随机接入过程。可见,在现有技术中,用户设备仅能使用低频上行载波F2和高频上下行载波F1时,终端设备无法获知在该低频F2上行载波进行随机接入所需要的信息,也在无法在该低频F2上行载波上进行随机接入。
本申请实施例提供的随机接入方法,通过网络设备在F1下行载波上发送的***消息中携带的F1上行载波和F2上行载波的随机接入信息,可以将F1上行载波和F2上行载波的随机接入信息都通知给终端设备。因此,终端设备可以根据F2上行载波的随机接入信息在F2上行载波上完成随机接入。
本申请实施例涉及的终端设备,可以是手机、平板电脑等无线终端,该无线终端包括向用户提供语音和/或数据服务的设备,终端设备还可以是具有无线连接功能的手持设备、车载设备、可穿戴设备、计算设备,以及各种形式的用户设备UE、移动台(Mobile Station,MS)及终端(terminal),本申请实施例并不限定。
本申请实施例涉及的网络设备,可以为5G通信***以及其他通信***中的任一具有管理无线网络资源的设备。例如:网络设备可以为5G通信***中的5G基站(g Node B,gNB)、5G通信***中的无线收发设备(NeXt Node,NX),本申请实施例并不限定。
下面以具体地实施例对本申请的技术方案以及本申请的技术方案如何解决上述技术问题进行详细说明。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中不再赘述。
图3为本申请实施例提供的随机接入方法的流程图。如图3所示,本申请实施例提供的随机接入方法,可以包括:
S101、网络设备在第一下行载波上向终端设备发送***消息。
其中,***消息可以包括在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同。
相应的,终端设备可以接收网络设备在第一下行载波上发送的***消息。
具体的,网络设备可以配置有一个下行载波和两个上行载波。其中,该一个下行载波可以称为第一下行载波。两个上行载波可以称为第一上行载波和第二上行载波。第一下行载波与第一上行载波的频率相同,且第一上行载波的频率大于第二上行载波的频率。或者参照图1理解为,网络设备可以配置有两个载波(F1和F2)。其中一个载波(F1)可以用于上行信息传输和下行信息传输,根据传输方向可以称为第一上行载波和第一下行载波。另一个载波(F2)仅用于上行信息传输,可以称为第二上行载波。由于第二上行载波的频率低,所以,第二上行载波相对于第一上行载波,信道衰 落更低,上行覆盖范围更大。
在本申请实施例中,网络设备在第一下行载波上向终端设备发送***消息,该***消息既包括了在第一上行载波上随机接入的第一信息,还包括了在第二上行载波上随机接入的第二信息。这样,网络设备就将第二上行载波的随机接入信息通知给了终端设备,可以使得终端设备根据第二信息在第二上行载波上发起随机接入。
其中,第一信息包括了在第一上行载波发起随机接入时终端设备需要获得的必要信息。通过第一信息,可以使得终端设备确定在第一上行载波上的资源。相似的,第二信息包括了在第二上行载波发起随机接入时终端设备需要获得的必要信息。通过第二信息,可以使得终端设备确定在第二上行载波上的资源。
其中,本实施例对于第一信息的实现方式不做限定,可以为现有的在第一下行载波上发送的***消息中携带的第一上行载波的随机接入信息。可选的,第一信息可以包括第一上行载波的中心频点、带宽和PRACH资源配置信息。可选的,PRACH资源配置信息可以包括PRACH配置索引。
其中,本实施例对于第二信息的实现方式不做限定,可以与现有的在第一下行载波上发送的***消息中携带的第一上行载波的随机接入信息相似。可选的,第二信息可以包括第二上行载波的中心频点、带宽和PRACH资源配置信息。可选的,PRACH资源配置信息可以包括PRACH配置索引。
可选的,***信息还可以包括接入指示信息。接入指示信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,可以通过对接入指示信息配置不同的值来进行指示。例如,当接入指示信息配置为“1”时,说明网络设备指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,可以通过接入指示信息指示目标载波的标识ID进行指示。例如,当接入指示信息指示了第二上行载波的ID时,说明网络设备指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,可以通过***消息中是否包括接入指示信息来进行指示。例如,当***信息中包括接入指示信息时,说明网络设备指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,第二信息还可以包括PRACH的功率门限信息。PRACH的功率门限信息为网络设备为终端设备设置的、用于终端设备确定在第一上行载波发起随机接入还是在第二上行载波上发起随机接入。
可选的,PRACH的功率门限信息可以为网络设备为终端设备设置的、在第一上行载波上发送随机接入请求消息时的第一功率门限值。
可选的,PRACH的功率门限信息可以为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的第二功率门限值。
可选的,PRACH的功率门限信息可以包括第三功率门限值和路损偏移值,第三功率门限值可以为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的功率门限值,路损偏移值可以为第二上行载波与第一上行载波之间的路损偏移值。
可选的,PRACH的功率门限信息可以为第三信息。第三信息用于指示终端设备在第二上行载波上发起随机接入。该第三信息可以直接是一个指示信息,也可以是一个特殊值。
相应地,如果该PRACH的功率门限信息为该第三信息,则终端设备根据该第三信息即可确定在第二上行载波上发起随机接入。如果该PRACH的功率门限信息不是该第三信息,比如该PRACH的功率门限信息为某个功率门限值,则该终端设备可以根据该功率门限值进行判断,以确定选择哪个上行载波发起随机接入。该功率门限值可以是前述第一功率门限值或第二功率门限值,根据这些功率门限值进行判断的具体实现在后续有详细描述。
需要说明的是,本实施例对于第一功率门限值、第二功率门限值、第三功率门限值和路损偏移值的具体数值不做限定。
可选的,第一功率门限值的取值范围可以包括终端设备的参考信号接收功率的取值范围。例如,假设终端设备的参考信号接收功率的取值范围为[-110dBm,-60dBm],那么第一功率门限值的取值范围包括[-110dBm,-60dBm]。
可选的,***消息还可以包括公共随机接入信息。
具体的,第一信息可以为在第一上行载波随机接入时与第一上行载波相关的信息,第二信息可以为在第二上行载波随机接入时与第二上行载波相关的信息。而公共随机接入信息,可以是对于第一上行载波随机接入与第二上行载波随机接入均适用的随机接入信息。本实施例对于公共随机接入信息的实现方式不做限定。可选的,公共随机接入信息可以包括跳频指示信息或者重传指示信息。
S102、终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息。
相应的,网络设备可以在第一上行载波上或者在第二上行载波上接收终端设备发送的随机接入请求消息。
具体的,对于一个特定的终端设备,通常只在一个上行载波上发送随机接入请求消息。由于终端设备接收的***消息中包括了在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,因此,终端设备可以在第一上行载波上或者在第二上行载波上发送随机接入请求消息。若终端设备在第一上行载波上发送随机接入请求消息,相应的,网络设备可以在第一上行载波上接收终端设备发送的随机接入请求消息。若终端设备在第二上行载波上发送随机接入请求消息,相应的,网络设备可以在第二上行载波上接收终端设备发送的随机接入请求消息。
需要说明的是,网络设备具有一定的信号覆盖范围,在信号覆盖范围内与网络设备通信的终端设备可能不只一个。因此,对于多个终端设备与网络设备通信的情况,网络设备可以在第一上行载波上和在第二上行载波上接收各个终端设备发送的随机接入请求消息。
可选的,终端设备在第一上行载波上或在第二上行载波上发送随机接入请求消息,可以包括:
终端设备通过根据第一信息确定的、在第一上行载波上的资源,或者通过根据第二信息确定的、在第二上行载波上的资源,向网络设备发送随机接入请求消息。
其中,对于终端设备如何根据第一信息确定在第一上行载波上的资源,以及如何 根据第二信息确定在第二上行载波上的资源,本实施例不做特别限定,可以采用现有随机接入过程中的任意一种资源确定方法。
可选的,若第一信息包括第一上行载波的中心频点、带宽和PRACH配置索引,则终端设备可以根据PRACH配置索引、在第一上行载波的中心频点和第一上行载波的带宽限定的时频资源上确定发送随机接入请求消息的资源。
可选的,若第二信息包括第二上行载波的中心频点、带宽和PRACH配置索引,则终端设备可以根据PRACH配置索引、在第二上行载波的中心频点和第二上行载波的带宽限定的时频资源上确定发送随机接入请求消息的资源。
其中,本实施例对于随机接入请求消息中包括的具体信息不做特别限定,可以与现有的随机接入请求消息中包括的信息相同。可选的,随机接入请求消息中可以包括随机接入序列。
S103、网络设备在第一下行载波上向终端设备发送随机接入响应消息。
相应的,终端设备可以接收网络设备在第一下行载波上发送的随机接入响应消息。
其中,本实施例对于随机接入响应消息中包括的具体信息不做特别限定,可以与现有的随机接入响应消息中包括的信息相同。可选的,随机接入响应消息可以包括TA。需要说明,若终端设备在第一上行载波发送随机接入请求消息,则TA与第一上行载波对应。若终端设备在第二上行载波发送随机接入请求消息,则TA与第二上行载波对应。
可见,本申请实施例提供的随机接入方法,在上行载波数目与下行载波数目不相等,且上行载波数目大于下行载波数目的场景中,通过网络设备在第一下行载波上向终端设备发送***消息,通过***消息中携带的在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,可以将两个上行载波的随机接入信息也发送给终端设备。从而,终端设备可以获得在第二上行载波发起随机接入的必要信息,完成在第二上行载波上的随机接入。由于第二上行载波的频率低于第一上行载波的频率,因此可以通过在第二上行载波上发起随机接入,提升随机接入成功率,提升网络设备的上行覆盖性能。
可选的,本实施例提供的随机接入方法,还可以包括:
S104、终端设备在第一上行载波上或在第二上行载波上发送RRC连接请求消息。
相应的,网络设备在第一上行载波上或者在第二上行载波上接收终端设备发送的RRC连接请求消息。
具体的,对于一个特定的终端设备,终端设备可以在第一上行载波上或在第二上行载波上发送RRC连接请求消息。需要说明的是,对于多个终端设备与网络设备通信的情况下,网络设备可以在第一上行载波上和在第二上行载波上接收各个终端设备发送的RRC连接请求消息。
S105、网络设备在第一下行载波上向终端设备发送RRC连接配置消息。
相应的,终端设备可以接收网络设备在第一下行载波上发送的RRC连接配置消息。
需要说明的是,本实施例对于RRC连接请求消息和RRC连接配置消息中包括的具体信息不做限定,可以与现有接入流程中的RRC消息相同。
进一步地,在S102终端设备在第一上行载波上或在第二上行载波上发送随机接入 请求消息之前,还可以包括:
终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息。
可选的,作为一种具体的实现方式,终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,可以包括:
终端设备根据***消息中包括的第二信息,确定在第二上行载波上发送随机接入请求消息。
具体的,由于第一上行载波的频率大于第二上行载波的频率,因此,第二上行载波相对于第一上行载波通常具有更低的信道衰落和更好的上行覆盖。第二上行载波的覆盖范围将大于第一上行载波的覆盖范围。在网络设备的信号覆盖范围内的一个特定位置上,第二上行载波的功率通常大于第一上行载波的功率。所以,若***消息中包括有在第二上行载波随机接入所需的第二信息时,终端设备可以直接确定在第二上行载波上发送随机接入请求消息。确定过程简单,缩短了随机接入的时间,提升了随机接入成功率。
可选的,作为另一种具体的实现方式,若***信息还包括接入指示信息,终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,可以包括:
终端设备根据接入指示信息,确定在第二上行载波上发送随机接入请求消息。
具体的,由于第一上行载波的频率大于第二上行载波的频率,因此,第二上行载波相对于第一上行载波通常具有更低的信道衰落和更好的上行覆盖。第二上行载波的覆盖范围将大于第一上行载波的覆盖范围。当第二上行载波负载较小、随机接入请求消息碰撞概率较低时,网络设备可以通过接入指示信息直接指示终端设备在第二上行载波上发送随机接入请求消息。相应的,终端设备直接根据接入指示信息确定在第二上行载波上发送随机接入请求消息。确定过程简单,缩短了随机接入的时间,提升了随机接入成功率。
可选的,作为另一种具体的实现方式,若第二信息还包括PRACH的功率门限信息,终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,可以包括:
终端设备根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息。
具体的,在通信过程中,在上下行载波频率相同时,上行功率衰减情况和下行功率衰减情况具有一定的对应关系,一个传输方向的功率衰减情况可以反映出另一个传输方向的功率衰减情况。第一下行载波的接收功率的信息为终端设备通过测量获取到的下行功率实际值,反映了第一下行载波的功率衰减水平。终端设备可以参考第一下行载波的接收功率的信息,获得第一上行载波的功率衰减情况。本实施例对于第一下行载波的接收功率的信息的实现方式不做限定。可选的,第一下行载波的接收功率的信息可以为参考信号接收功率(Reference Signal Received Power,RSRP),或者为参考信号接收质量(Reference Signal Received Quality,RSRQ)。PRACH的功率门限信息反映了随机接入过程中需要满足的最小功率条件。因此,根据第一下行载波的接收功率的信息和PRACH的功率门限信息,可以确定第一上行载波或者第二上行载波是否满足随机接入条件。这样,在第一上行载波和在第二上行载波中选择一个更好的上 行载波发送随机接入请求消息,可以进一步提升随机接入成功率。
可选的,作为第一种实现方式,若第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率,PRACH的功率门限信息为终端设备在第一上行载波上发送随机接入请求消息时的第一功率门限值,则终端设备根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息,可以包括:
若第一下行载波的参考信号接收功率大于或者等于第一功率门限值,则终端设备确定在第一上行载波上发送随机接入请求消息;
若第一下行载波的参考信号接收功率小于第一功率门限值,则终端设备确定在第二上行载波上发送随机接入请求消息。
具体的,第一功率门限值由网络设备配置。本实施例对于第一功率门限值的配置方式不做限定。可选地,第一功率门限值可以反映在第一上行载波上发送随机接入请求消息时需要满足的最低功率要求。如果第一下行载波的参考信号接收功率大于或者等于第一功率门限值,则说明第一上行载波可以满足随机接入条件,终端设备可以在第一上行载波上发送随机接入请求消息,并不需要在功率水平更好的第二上行载波上发送随机接入请求消息。如果第一下行载波的参考信号接收功率小于第一功率门限值,则说明第一上行载波无法满足随机接入条件,终端设备可以在功率水平更好的第二上行载波上发送随机接入请求消息。
可选的,第一功率门限值可以设置为总是大于终端设备的参考信号接收功率,例如,第一功率门限值可以为正无穷,或者为大于终端设备的参考信号接收功率最大值的任意数值。
可选的,作为第二种实现方式,若第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率,PRACH的功率门限信息为终端设备在第二上行载波上发送随机接入请求消息时的第二功率门限值,则终端设备根据第一下行载波的参考信号接收功率和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波发送随机接入请求消息,可以包括:
若第一下行载波的参考信号接收功率大于或者等于第二功率门限值,则终端设备确定在第二上行载波上发送随机接入请求消息;
若第一下行载波的参考信号接收功率小于第二功率门限值,则终端设备确定在第一上行载波上发送随机接入请求消息。
具体的,第二功率门限值由网络设备配置,本实施例对于第二功率门限值的配置方式不做限定。可选地,第二功率门限值可以反映在第二上行载波上发送随机接入请求消息时需要满足的最低功率要求、路损偏移值和网络设备对随机接入载波的选择倾向。如果第一下行载波的参考信号接收功率大于或者等于第二功率门限值,则终端设备可以在第二上行载波上发送随机接入请求消息。如果第一下行载波的参考信号接收功率小于第二功率门限值,则终端设备可以在第一上行载波上发送随机接入请求消息。
可选的,作为第三种实现方式,若第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率,PRACH的功率门限信息包括终端设备在第二上行载波上发送随机接入请求消息时的第三功率门限值,和第二上行载波与第一上行载波之间的路损 偏移值,则终端设备根据第一下行载波的参考信号接收功率和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波发送随机接入请求消息,可以包括:
若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值≥0,则终端设备确定在第二上行载波上发送随机接入请求消息;
若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值<0,则终端设备确定在第一上行载波上发送随机接入请求消息。
具体的,第三功率门限值由网络设备配置,本实施例对于第三功率门限值的配置方式不做限定。可选地,第三功率门限值可以反映在第二上行载波上发送随机接入请求消息时需要满足的最低功率要求和网络设备对随机接入载波的选择倾向。第二上行载波与第一上行载波之间的路损偏移值为第二上行载波的路损值与第一上行载波的路损值的差值,本实施例对于路损偏移值的测量和配置方式不做限定。如果第一下行载波的参考信号接收功率与路损偏移值的和大于或者等于第三功率门限值,则终端设备可以在第二上行载波上发送随机接入请求消息。如果第一下行载波的参考信号接收功率与路损偏移值的和小于第三功率门限值,则终端设备可以在第一上行载波上发送随机接入请求消息。
可选的,作为又一种实现方式,若第二信息还包括PRACH的功率门限信息,若PRACH的功率门限信息为第三信息,则终端设备确定在第一上行载波上或在第二上行载波上发送随机接入请求消息,可以包括:
终端设备根据第三信息,确定在第二上行载波上发送随机接入请求消息。
具体的,第三信息可以作为一个指示信息,该指示信息指示终端设备无需判断第一下行载波的参考信号接收功率与任何功率门限值之间的大小,确定从第二上行载波上发送随机接入请求消息。确定过程简单,缩短了随机接入的时间,提升了随机接入成功率。
本申请实施例提供了一种随机接入方法,包括:网络设备在第一下行载波上向终端设备发送***消息,***消息包括在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同。终端设备在第一上行载波上或第二上行载波上发送随机接入请求消息。网络设备在第一下行载波上向终端设备发送随机接入响应消息。本申请实施例提供的随机接入方法,在上行载波数目与下行载波数目不相等,且上行载波数目大于下行载波数目的场景中,终端设备可以在任意上行载波上完成随机接入过程,从而提升了随机接入成功率,提升了网络设备的上行覆盖性能。
图4为本申请实施例一提供的终端设备的结构示意图。本申请实施例提供的终端设备,用于执行图3所示实施例提供的随机接入方法中终端设备执行的操作。如图4所示,本申请实施例提供的终端设备,可以包括:
接收模块11,用于接收网络设备在第一下行载波上发送的***消息。***消息包括在第一上行载波随机接入所需的第一信息,以及在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同。
发送模块12,用于在第一上行载波上或在第二上行载波上发送随机接入请求消息。
接收模块11还用于,接收网络设备在第一下行载波上发送的随机接入响应消息。
可选的,第一信息包括:第一上行载波的中心频点、带宽和PRACH资源配置信息。
第二信息包括:第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,还包括处理模块13,处理模块13用于:
确定在第一上行载波上或在第二上行载波上发送随机接入请求消息。
可选的,处理模块13具体用于:
根据***消息中包括的第二信息,确定在第二上行载波上发送随机接入请求消息。
可选的,***消息还包括接入指示信息,接入指示信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
处理模块13具体用于:
终端设备根据接入指示信息,确定在第二上行载波上发送随机接入请求消息。
可选的,第二信息还包括PRACH的功率门限信息。
处理模块13具体用于:
根据第一下行载波的接收功率的信息和PRACH的功率门限信息,确定在第一上行载波上或者在第二上行载波上发送随机接入请求消息。
可选的,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。
PRACH的功率门限信息为终端设备在第一上行载波上发送随机接入请求消息时的第一功率门限值。
处理模块13具体用于:
若第一下行载波的参考信号接收功率大于或者等于第一功率门限值,则确定在第一上行载波上发送随机接入请求消息。
若第一下行载波的参考信号接收功率小于第一功率门限值,则确定在第二上行载波上发送随机接入请求消息。
可选的,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。
PRACH的功率门限信息为终端设备在第二上行载波上发送随机接入请求消息时的第二功率门限值。
处理模块13具体用于:
若第一下行载波的参考信号接收功率大于或者等于第二功率门限值,则确定在第二上行载波上发送随机接入请求消息。
若第一下行载波的参考信号接收功率小于第二功率门限值,则确定在第一上行载波上发送随机接入请求消息。
可选的,第一下行载波的接收功率的信息为第一下行载波的参考信号接收功率。
PRACH的功率门限信息包括终端设备在第二上行载波上发送随机接入请求消息时的第三功率门限值,和第二上行载波与第一上行载波之间的路损偏移值。
处理模块13具体用于:
若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值≥0,则确定在第二上行载波上发送随机接入请求消息。
若第一下行载波的参考信号接收功率+路损偏移值-第三功率门限值<0,则确定在第一上行载波上发送随机接入请求消息。
可选的,PRACH的功率门限信息为第三信息,第三信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
处理模块13具体用于:
终端设备根据第三信息,确定在第二上行载波上发送随机接入请求消息。
可选的,发送模块12具体用于:
通过根据第一信息确定的、在第一上行载波上的资源,或者通过根据第二信息确定的、在第二上行载波上的资源,向网络设备发送随机接入请求消息。
本申请实施例提供的终端设备,用于执行图3所示方法实施例中终端设备执行的操作,其技术原理和技术效果类似,此处不再赘述。
图5为本申请实施例一提供的网络设备的结构示意图。本申请实施例提供的网络设备,用于执行图3所示实施例提供的随机接入方法中网络设备执行的操作。如图5所示,本申请实施例提供的网络设备,可以包括:
发送模块21,用于在第一下行载波上向终端设备发送***消息,***消息包括在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,第一上行载波的频率大于第二上行载波的频率,第一下行载波与第一上行载波的频率相同。
接收模块22,用于在第一上行载波上或者在第二上行载波上接收终端设备发送的随机接入请求消息。
发送模块21还用于,在第一下行载波上向终端设备发送随机接入响应消息。
可选的,第一信息包括:第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息。
第二信息包括:第二上行载波的中心频点、带宽和PRACH资源配置信息。
可选的,第二信息还包括PRACH的功率门限信息。
可选的,PRACH的功率门限信息为第三信息,第三信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
可选的,PRACH的功率门限信息为网络设备为终端设备设置的、在第一上行载波上发送随机接入请求消息时的第一功率门限值。
可选的,PRACH的功率门限信息为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的第二功率门限值。
可选的,PRACH的功率门限信息包括第三功率门限值和路损偏移值,第三功率门限值为网络设备为终端设备设置的、在第二上行载波上发送随机接入请求消息时的功率门限值,路损偏移值为第二上行载波与第一上行载波之间的路损偏移值。
可选的,***消息还包括接入指示信息,接入指示信息用于指示终端设备在第二上行载波上发送随机接入请求消息。
本申请实施例提供的网络设备,用于执行图3所示方法实施例中网络设备执行的操作,其技术原理和技术效果类似,此处不再赘述。
图6为本申请实施例二提供的终端设备的结构示意图,如图6所示,该终端设备包括处理器31、存储器32和收发器33,所述存储器32用于存储指令,所述收发器33用于和其他设备通信,所述处理器31用于执行所述存储器32中存储的指令,以使所述终端设备执行图3所示实施例中终端设备执行的操作,具体实现方式和技术效果类似,这里不再赘述。
图7为本申请实施例二提供的网络设备的结构示意图,如图7所示,该网络设备包括处理器41、存储器42和收发器43,所述存储器42用于存储指令,所述收发器43用于和其他设备通信,所述处理器41用于执行所述存储器42中存储的指令,以使所述网络设备执行图3所示实施例中网络设备执行的操作,具体实现方式和技术效果类似,这里不再赘述。
可以理解,本申请中网络设备或者终端设备使用的处理器可以是中央处理器(CPU),通用处理器、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、晶体管逻辑器件,硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框,模块和电路。所述处理器也可以是实现计算功能的组合,例如包含一个或多个微处理器组合,DSP和微处理器的组合等等。
本领域普通技术人员可以理解:实现上述各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,执行包括上述各方法实施例的步骤;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申请实施例的技术方案,而非对其限制;尽管参照前述各实施例对本申请实施例进行了详细的说明,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申请实施例技术方案的范围。
Claims (34)
- 一种随机接入方法,其特征在于,包括:终端设备接收网络设备在第一下行载波上发送的***消息,所述***消息包括在第一上行载波随机接入所需的第一信息,以及在第二上行载波随机接入所需的第二信息,所述第一上行载波的频率大于所述第二上行载波的频率,所述第一下行载波与所述第一上行载波的频率相同;所述终端设备在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息;所述终端设备接收所述网络设备在所述第一下行载波上发送的随机接入响应消息。
- 根据权利要求1所述的方法,其特征在于,所述第一信息包括:所述第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息;所述第二信息包括:所述第二上行载波的中心频点、带宽和PRACH资源配置信息。
- 根据权利要求1或2所述的方法,其特征在于,所述终端设备在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息之前,所述方法还包括:所述终端设备确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求3所述的方法,其特征在于,所述终端设备确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息,包括:所述终端设备根据所述***消息中包括的所述第二信息,确定在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求3所述的方法,其特征在于,所述第二信息还包括PRACH的功率门限信息;所述终端设备确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息,包括:所述终端设备根据所述第一下行载波的接收功率的信息和所述PRACH的功率门限信息,确定在所述第一上行载波上或者在所述第二上行载波上发送所述随机接入请求消息。
- 根据权利要求5所述的方法,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息为所述终端设备在所述第一上行载波上发送随机接入请求消息时的第一功率门限值;所述终端设备根据所述第一下行载波的接收功率的信息和所述PRACH的功率门限信息,确定在所述第一上行载波上或者在所述第二上行载波上发送所述随机接入请求消息,包括:若所述第一下行载波的参考信号接收功率大于或者等于所述第一功率门限值,则所述终端设备确定在所述第一上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率小于所述第一功率门限值,则所述终端设备确定在所述第二上行载波上发送所述随机接入请求消息。
- 根据权利要求5所述的方法,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息为所述终端设备在所述第二上行载波上发送随机接入请求消息时的第二功率门限值;所述终端设备根据所述第一下行载波的参考信号接收功率和所述PRACH的功率门限信息,确定在所述第一上行载波上或者在所述第二上行载波发送所述随机接入请求消息,包括:若所述第一下行载波的参考信号接收功率大于或者等于所述第二功率门限值,则所述终端设备确定在所述第二上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率小于所述第二功率门限值,则所述终端设备确定在所述第一上行载波上发送所述随机接入请求消息。
- 根据权利要求5所述的方法,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息包括所述终端设备在所述第二上行载波上发送随机接入请求消息时的第三功率门限值,和所述第二上行载波与所述第一上行载波之间的路损偏移值;所述终端设备根据所述第一下行载波的参考信号接收功率和所述PRACH的功率门限信息,确定在所述第一上行载波上或者在所述第二上行载波发送所述随机接入请求消息,包括:若所述第一下行载波的参考信号接收功率+所述路损偏移值-所述第三功率门限值≥0,则所述终端设备确定在所述第二上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率+所述路损偏移值-所述第三功率门限值<0,则所述终端设备确定在所述第一上行载波上发送所述随机接入请求消息。
- 根据权利要求1至7任一项所述的方法,其特征在于,所述终端设备在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息,包括:所述终端设备通过根据所述第一信息确定的、在所述第一上行载波上的资源,或者通过根据所述第二信息确定的、在所述第二上行载波上的资源,向所述网络设备发送所述随机接入请求消息。
- 根据权利要求3所述的方法,其特征在于,所述***消息还包括接入指示信息,所述接入指示信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息;所述终端设备确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息,包括:所述终端设备根据所述接入指示信息,确定在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求3所述的方法,其特征在于,所述第二信息还包括PRACH的功率门限信息,所述PRACH的功率门限信息为第三信息,所述第三信息用于指示所 述终端设备在所述第二上行载波上发送随机接入请求消息;所述终端设备确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息,包括:所述终端设备根据所述第三信息,确定在所述第二上行载波上发送随机接入请求消息。
- 一种随机接入方法,其特征在于,包括:网络设备在第一下行载波上向终端设备发送***消息,所述***消息包括在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,所述第一上行载波的频率大于所述第二上行载波的频率,所述第一下行载波与所述第一上行载波的频率相同;所述网络设备在所述第一上行载波上或者在所述第二上行载波上接收所述终端设备发送的随机接入请求消息;所述网络设备在所述第一下行载波上向所述终端设备发送随机接入响应消息。
- 根据权利要求12所述的方法,其特征在于,所述第一信息包括:所述第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息;所述第二信息包括:所述第二上行载波的中心频点、带宽和PRACH资源配置信息。
- 根据权利要求13所述的方法,其特征在于,所述第二信息还包括PRACH的功率门限信息。
- 根据权利要求14所述的方法,其特征在于,所述PRACH的功率门限信息为所述网络设备为所述终端设备设置的、在所述第一上行载波上发送随机接入请求消息时的第一功率门限值;或者,所述PRACH的功率门限信息为所述网络设备为所述终端设备设置的、在所述第二上行载波上发送随机接入请求消息时的第二功率门限值;或者,所述PRACH的功率门限信息包括第三功率门限值和路损偏移值,所述第三功率门限值为所述网络设备为所述终端设备设置的、在所述第二上行载波上发送随机接入请求消息时的功率门限值,所述路损偏移值为所述第二上行载波与所述第一上行载波之间的路损偏移值。
- 根据权利要求14所述的方法,其特征在于,所述PRACH的功率门限信息为第三信息,所述第三信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求12或13所述的方法,其特征在于,所述***消息还包括接入指示信息,所述接入指示信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息。
- 一种终端设备,其特征在于,包括:接收模块,用于接收网络设备在第一下行载波上发送的***消息,所述***消息包括在第一上行载波随机接入所需的第一信息,以及在第二上行载波随机接入所需的第二信息,所述第一上行载波的频率大于所述第二上行载波的频率,所述第一下行载 波与所述第一上行载波的频率相同;发送模块,用于在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息;所述接收模块还用于,接收所述网络设备在所述第一下行载波上发送的随机接入响应消息。
- 根据权利要求18所述的终端设备,其特征在于,所述第一信息包括:所述第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息;所述第二信息包括:所述第二上行载波的中心频点、带宽和PRACH资源配置信息。
- 根据权利要求18或19所述的终端设备,其特征在于,还包括处理模块,所述处理模块用于:确定在所述第一上行载波上或在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求20所述的终端设备,其特征在于,所述处理模块具体用于:根据所述***消息中包括的所述第二信息,确定在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求20所述的终端设备,其特征在于,所述第二信息还包括PRACH的功率门限信息;所述处理模块具体用于:根据所述第一下行载波的接收功率的信息和所述PRACH的功率门限信息,确定在所述第一上行载波上或者在所述第二上行载波上发送所述随机接入请求消息。
- 根据权利要求22所述的终端设备,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息为终端设备在所述第一上行载波上发送随机接入请求消息时的第一功率门限值;所述处理模块具体用于:若所述第一下行载波的参考信号接收功率大于或者等于所述第一功率门限值,则确定在所述第一上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率小于所述第一功率门限值,则确定在所述第二上行载波上发送所述随机接入请求消息。
- 根据权利要求22所述的终端设备,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息为终端设备在所述第二上行载波上发送随机接入请求消息时的第二功率门限值;所述处理模块具体用于:若所述第一下行载波的参考信号接收功率大于或者等于所述第二功率门限值,则确定在所述第二上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率小于所述第二功率门限值,则确定在所述第一上行载波上发送所述随机接入请求消息。
- 根据权利要求22所述的终端设备,其特征在于,所述第一下行载波的接收功率的信息为所述第一下行载波的参考信号接收功率;所述PRACH的功率门限信息包括终端设备在所述第二上行载波上发送随机接入请求消息时的第三功率门限值,和所述第二上行载波与所述第一上行载波之间的路损偏移值;所述处理模块具体用于:若所述第一下行载波的参考信号接收功率+所述路损偏移值-所述第三功率门限值≥0,则确定在所述第二上行载波上发送所述随机接入请求消息;若所述第一下行载波的参考信号接收功率+所述路损偏移值-所述第三功率门限值<0,则确定在所述第一上行载波上发送所述随机接入请求消息。
- 根据权利要求18至25任一项所述的终端设备,其特征在于,所述发送模块具体用于:通过根据所述第一信息确定的、在所述第一上行载波上的资源,或者通过根据所述第二信息确定的、在所述第二上行载波上的资源,向所述网络设备发送所述随机接入请求消息。
- 根据权利要求20所述的终端设备,其特征在于,所述***消息还包括接入指示信息,所述接入指示信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息;所述处理模块具体用于:所述终端设备根据所述接入指示信息,确定在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求20所述的终端设备,其特征在于,所述第二信息还包括PRACH的功率门限信息,所述PRACH的功率门限信息为第三信息,所述第三信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息;所述处理模块具体用于:所述终端设备根据所述第三信息,确定在所述第二上行载波上发送随机接入请求消息。
- 一种网络设备,其特征在于,包括:发送模块,用于在第一下行载波上向终端设备发送***消息,所述***消息包括在第一上行载波随机接入所需的第一信息和在第二上行载波随机接入所需的第二信息,所述第一上行载波的频率大于所述第二上行载波的频率,所述第一下行载波与所述第一上行载波的频率相同;接收模块,用于在所述第一上行载波上或者在所述第二上行载波上接收所述终端设备发送的随机接入请求消息;所述发送模块还用于,在所述第一下行载波上向所述终端设备发送随机接入响应消息。
- 根据权利要求29所述的网络设备,其特征在于,所述第一信息包括:所述第一上行载波的中心频点、带宽和物理随机接入信道PRACH资源配置信息;所述第二信息包括:所述第二上行载波的中心频点、带宽和PRACH资源配置信息。
- 根据权利要求30所述的网络设备,其特征在于,所述第二信息还包括PRACH的功率门限信息。
- 根据权利要求31所述的网络设备,其特征在于,所述PRACH的功率门限信息为网络设备为所述终端设备设置的、在所述第一上行载波上发送随机接入请求消息时的第一功率门限值;或者,所述PRACH的功率门限信息为网络设备为所述终端设备设置的、在所述第二上行载波上发送随机接入请求消息时的第二功率门限值;或者,所述PRACH的功率门限信息包括第三功率门限值和路损偏移值,所述第三功率门限值为网络设备为所述终端设备设置的、在所述第二上行载波上发送随机接入请求消息时的功率门限值,所述路损偏移值为所述第二上行载波与所述第一上行载波之间的路损偏移值。
- 根据权利要求31所述的网络设备,其特征在于,所述PRACH的功率门限信息为第三信息,所述第三信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息。
- 根据权利要求29或30所述的网络设备,其特征在于,所述***消息还包括接入指示信息,所述接入指示信息用于指示所述终端设备在所述第二上行载波上发送随机接入请求消息。
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CN101778482A (zh) * | 2009-01-09 | 2010-07-14 | 华为技术有限公司 | 初始网络接入的方法及装置 |
CN101969697A (zh) * | 2009-07-28 | 2011-02-09 | 华为技术有限公司 | 用户设备上行随机接入基站的方法及***、基站和用户设备 |
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