WO2010078729A1 - 一种多载波小区切换方法、装置及*** - Google Patents

一种多载波小区切换方法、装置及*** Download PDF

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Publication number
WO2010078729A1
WO2010078729A1 PCT/CN2009/070114 CN2009070114W WO2010078729A1 WO 2010078729 A1 WO2010078729 A1 WO 2010078729A1 CN 2009070114 W CN2009070114 W CN 2009070114W WO 2010078729 A1 WO2010078729 A1 WO 2010078729A1
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Prior art keywords
carrier
handover
target cell
information
cell
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PCT/CN2009/070114
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English (en)
French (fr)
Inventor
肖登坤
李安俭
李庆
韩静
贺媛
王文杰
陆志宏
蔺波
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2009/070114 priority Critical patent/WO2010078729A1/zh
Priority to CN2009801244138A priority patent/CN102113374B/zh
Publication of WO2010078729A1 publication Critical patent/WO2010078729A1/zh
Priority to US13/180,793 priority patent/US20110269469A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]

Definitions

  • the present invention relates to the field of wireless network communications, and in particular, to a multi-carrier cell handover method, apparatus, and system. Background technique
  • LTE-A LTE-Advance
  • Carrier Aggregation Carrier Aggregation
  • one UE of LTE-A can use more than one carrier.
  • the aggregation can be divided into three types, continuous carrier aggregation, discontinuous carrier aggregation in the same band, and non-continuous carrier aggregation in different bands.
  • Future network topologies can be divided into equal coverage scenarios and unequal coverage scenarios. The case of equal coverage is that the coverage of the carrier is the same regardless of the carrier. Unequal coverage is different carriers. Their transmit powers are the same or different, but their coverage is not the same.
  • the UE In the prior art, the UE generally measures the reference signal received power (RSRP: Reference Signal Received Power) of the neighboring cell, and determines whether the value of the neighboring cell RSRP is better than the value of the serving cell RSRP by an offset. If the above conditions are met, the UE triggers The A3 event reports the measurement report triggered by the event, and the serving cell can initiate the handover decision after receiving the measurement report.
  • RSRP Reference Signal Received Power
  • the inventors of the present invention have found that the prior art has at least the following disadvantages: Since the cell may use multiple carriers in the system, since the fading conditions of different carriers are different, the RSRP is measured. The corresponding RSRP value is measured for each carrier, which may trigger the A3 event multiple times and initiate the handover decision, thus wasting resources of the network device. Summary of the invention
  • an embodiment of the present invention provides a multi-carrier cell handover method.
  • the method includes: receiving, by a source cell, an event-triggered measurement report of a user equipment (UE), and selecting, by the UE, at least one carrier of at least one target cell; when receiving a plurality of event-triggered measurement reports within an estimated time interval, Determining whether the target cell in the measurement report of the carrier is the same cell; and, according to the determining result, switching the UE to a corresponding carrier of the corresponding target cell.
  • UE user equipment
  • the embodiment of the present invention further provides a multi-carrier cell handover method, where the method includes: a handover request message sent by a source cell to at least one target cell when a UE performs handover between multiple carrier cells. Adding at least one carrier information to the command; parsing the information that the target cell in the received handover request response signaling allocates a carrier to the handover request; and adding, according to the parsing result, the handover command sent to the UE of the UE
  • the target cell allocates information of the carrier; according to the information in the allocated carrier, the UE is handed over to the corresponding carrier of the corresponding target cell.
  • the embodiment of the present invention further provides a multi-carrier switching apparatus, where the apparatus includes: a receiving unit, configured to receive an event-triggered measurement report of the UE; and a selecting unit, configured to select at least the UE At least one carrier of a target cell; a determining unit, configured to determine whether the target cell in the measurement report of the carrier is the same cell when receiving a plurality of event-triggered measurement reports within an estimated time interval; Switching the UE to a corresponding carrier of a corresponding target cell.
  • the embodiment of the present invention further provides a multi-carrier switching apparatus, where the apparatus includes: when a UE performs handover between multi-carrier cells, a handover requesting module is configured to send, in a source cell, to at least one target cell.
  • At least one carrier information is added to the handover request signaling; the handover response module is configured to parse information of the carrier allocated to the handover request by the target cell in the received handover request response signaling; and a UE setting module, configured to The result of the analysis of the handover response module, the information of the target cell allocation carrier is added to the handover command sent to the UE of the UE; the handover processing module is configured to switch the UE to the corresponding according to the information in the allocated carrier The corresponding carrier of the target cell.
  • the embodiment of the present invention further provides a multi-carrier switching system, where the system includes a multi-carrier switching apparatus, and is configured to receive an event-triggered measurement report reported by a UE served by the UE. And receiving a plurality of event-triggered measurement reports within an estimated time interval, performing a handover decision according to the measurement report triggered by the plurality of events, and switching the UE to a corresponding carrier of the corresponding target cell.
  • the beneficial effects of the embodiments of the present invention are that, by considering the delay problem of the trigger event in the multi-carrier system, the batch switching process and the parallel switching process can be performed for different switching situations by estimating the time interval and the information of the measurement report, saving the source.
  • the resources of the eNB and the target eNB improve handover efficiency.
  • FIG. 1 is a flowchart of a first embodiment of a multi-carrier cell handover method according to the present invention
  • FIG. 2 is a flowchart of an embodiment of a method for performing batch handover processing on a UE according to the present invention
  • FIG. 3 is a flowchart of an embodiment of a method for performing parallel handover processing on a UE according to the present invention
  • FIG. 5 is a flowchart of a third embodiment of a multi-carrier cell handover method according to the present invention
  • FIG. 6 is a flowchart of a multi-carrier cell handover method according to a fourth embodiment of the present invention
  • FIG. 7 is a structural diagram of a first embodiment of a multi-carrier cell switching apparatus according to the present invention
  • FIG. 8 is a structural diagram of an embodiment of a handover processing unit according to the present invention.
  • FIG. 9 is a structural diagram of a second embodiment of a multi-carrier cell switching apparatus according to the present invention. detailed description
  • Embodiments of the present invention provide a multi-carrier cell handover method, apparatus, and system.
  • the following is attached The drawings illustrate the invention in detail.
  • the handover process is: First, the radio condition of the user equipment (UE) is changed, and after the UE measures the neighboring cell of the current cell, the UE sends a measurement report to the source cell, where the current cell is located. That is, the source cell; then, the source cell makes a decision according to the measurement report, determines the target cell to which the UE is to be handed over, notifies the target cell to prepare for handover, and sends a handover command to the UE; second, the UE disconnects and the source that receives the handover command After the cell is connected to the target cell, the user data is started to be sent and received on the target cell. Finally, the target cell notifies the UE source cell to release the resources occupied by the UE.
  • the UE user equipment
  • FIG. 1 is a flowchart of a first embodiment of a multi-carrier cell handover method according to the present invention.
  • Step 101 The source cell receives an event-triggered measurement report reported by the user equipment (UE) served by the source cell.
  • UE user equipment
  • the method further includes: selecting, according to the measurement report, neighbor cell information stored on the source cell, at least one target cell. At least one carrier.
  • the measurement report includes identifier information of an event that triggers the measurement report, carrier information of the target cell measured by the UE, and corresponding measurement value, and the target cell
  • the measured value includes an RSRP measured by the UE, and a reference signal received quality (RSRQ: Reference Signal Received Quality).
  • RSRQ Reference Signal Received Quality
  • selecting at least one carrier frequency point of the at least one target cell includes: selecting, according to the measurement report and the neighbor cell information stored on the source cell.
  • the estimated time interval is calculated as follows:
  • ARSRQ RSRQ - RSRff ( 1 ) RSRP ⁇ RSRP
  • ⁇ ⁇ is the reference signal received power in the UE measurement report
  • AR is the displacement of the UE in ⁇ time, which is the displacement speed of the UE.
  • Both RSRQ and RSRQ T are available through the source eNB.
  • the method before the step 102, the method further includes: determining whether the UE belongs to the LTE system or the LTE-A system, and if it belongs to the LTE system, switching according to the switching process of the LTE system.
  • the method further includes: determining, according to the measurement report of the UE, whether the carrier frequency used by the UE is a single frequency point. If it is a single frequency point, it is switched according to the switching process of the LTE system.
  • the event-triggered measurement report of the UE includes a measurement report that is performed when the A3 event is triggered.
  • the step 102 further includes: determining whether the target cell corresponding to the carrier indicated in the measurement report is the same cell, and if the determination result is the same cell, switching the UE to the target The corresponding carrier of the cell, that is, performs batch handover processing; otherwise, the UE is switched to the corresponding carrier of the corresponding target cell, that is, parallel switching processing is performed.
  • the batch handover process includes: adding the selected carrier information, usually a plurality of carrier information, to handover request signaling sent to the one target cell,
  • the carrier information allocated by the target cell, SP the carrier information currently allowed to be used by the target cell, for example, if the target cell has three, may be used in the handover request response signaling returned by the received target cell.
  • Carrier but due to the load, the handover request can only be switched between the two carriers, and the information of the allocated carrier added by the target cell in the handover request response signaling includes only the two carrier information; Adding information of the allocated carrier to the handover command signaling sent by the UE; and switching the UE to a carrier allocated by the target cell.
  • the parallel handover process includes: adding the selected carrier information to handover request signaling sent to a plurality of target cells, and similarly, usually multiple carrier information, or only one carrier Transmitting, in the received handover request response signaling returned by the plurality of target cells, carrier information allocated by the plurality of target cells; adding the plurality of target cell assignments to handover command signaling sent to the UE Corresponding carrier information; switching the UE to an allocated carrier allocated by a plurality of target cells.
  • the switching between the source cell and the target cell is performed by the X2 interface of the source eNB and the target eNB, or by the mobility management entity ( ⁇ E) respectively connected to the source eNB and the target eNB. Communicate.
  • the cell handover of the UE can be controlled according to the estimated time interval and the target cell information, thereby reducing resource consumption of multiple handover decisions.
  • FIG. 2 is a flowchart of an embodiment of a method for batch switching processing of a UE according to the present invention.
  • Step 201 Measurement control, the source eNB sends some measured frequency points and control information to the UE.
  • Step 202 The UE returns a measurement report (measurement reports) to the source eNB.
  • the serving cell source eNB performs uplink allocation (UL al location) on the UE, so that the UE reports the measurement report on the allocated uplink resource.
  • Step 203 The source eNB performs a handover decision, and the source eNB processes the measurement report to perform a handover decision of the target cell.
  • Step 204 The source eNB sends a handover request to the target eNB, where the handover request includes information of at least one carrier, that is, including which carriers the UE needs to perform handover.
  • Step 205 The target eNB performs admission control: the target eNB performs admission control according to the current resource status of the current cell, and determines a carrier allocated to the handover request.
  • Step 206 The target eNB performs a handover request acknowledgement, and the target eNB feeds back the handover request, and transmits the actually allocated carrier information to the source eNB.
  • Step 207 The source eNB sends a handover command to the UE.
  • the source eNB performs downlink allocation (DL al location) for the UE, and is used to deliver a handover command, which includes information such as allocated carrier information and power.
  • DL al location downlink allocation
  • the source eNB performs downlink allocation (DL al location) for the UE, and is used to deliver a handover command, which includes information such as allocated carrier information and power.
  • Step 208 The source eNB performs SN status transfer to the target eNB, and the source eNB forwards the transmitted data to the target eNB, and the target eNB buffers the data packets.
  • Step 209 The UE sends synchronization synchronization to the target eNB, and the UE performs the same with the target eNB.
  • Step 2 1 the target e N B sends the uplink allocation and time advance information (UL allocation+TA) to the U E .
  • Step 211 The UE sends a handover acknowledgement to the target eNB.
  • FIG. 3 is a flowchart of an embodiment of a method for performing parallel switching processing on a UE according to the present invention.
  • Step 301 The source eNB sends measurement control signaling to the UE, where the measurement control signaling includes the measured frequency point and control information.
  • Step 302 The UE returns a measurement report to the source eNB, and the serving cell source eNB performs uplink allocation on the UE, so that the UE reports the measurement report on the allocated uplink resource.
  • Step 303 The source eNB performs a handover decision, and the source eNB processes the measurement report to perform a handover decision of the target cell.
  • the specific processing is as shown in the first embodiment.
  • Step 304 The source eNB sends a handover request to the target eNB1, where the handover request includes information of at least one carrier, that is, including which carriers the UE needs to perform handover.
  • Step 305 The source eNB sends a handover request to the target eNB2, where the handover request includes information about at least one carrier, that is, including which carriers the UE needs to perform handover.
  • Step 306 The target eNB1 performs admission control: The target eNB1 performs admission control according to the current resource status of the current cell, and determines a carrier allocated to the handover request.
  • Step 307 The target eNB1 performs a handover request response, and the target eNB1 feeds back the handover request, and transmits the actually allocated carrier information to the source eNB.
  • Step 308 The target eNB1 performs admission control: The target eNB2 performs admission control according to the current resource status of the current cell, and determines a carrier allocated to the handover request.
  • Step 309 The target eNB2 performs a handover request response, and the target eNB2 feeds back the handover request, and transmits the actually allocated carrier information to the source eNB.
  • Step 310 The source eNB sends a handover command to the UE, and the source eNB performs downlink allocation for the UE, and sends a handover command, which includes information about allocated carrier information and power.
  • Step 311 The source eNB performs sequence number state transmission to the target eNB1, and the source eNB forwards the transmitted data to the target eNB1, and the target eNB1 buffers the data packets.
  • Step 312 The source eNB performs sequence number state transmission to the target eNB2, and the source eNB forwards the transmitted data to the target eNB2, and the target eNB1 buffers the data packets.
  • Step 313 The UE sends synchronization signaling to the target eNB1, and the UE synchronizes with the target eNB1.
  • Step 314 The UE sends synchronization signaling to the target eNB2, and the UE synchronizes with the target eNB2.
  • Step 315 The target eNB1 sends uplink allocation and time advance information to the UE.
  • Step 3 1 6 Target e N B 2 sends uplink allocation and time advance information (UL allocation+TA) to U E .
  • Step 317 The UE sends handover confirmation signaling to the target eNB1.
  • Step 318 The UE sends handover confirmation signaling to the target eNB2.
  • the signaling is transmitted between the source e NB and the target eNB through an X2 interface.
  • the source eNB sends a slice to the mobility management entity ( ⁇ E). Adding the selected at least one carrier information to the request signaling.
  • the ME sends the handover request signaling to the eNB of the target cell, and the eNB of the target cell adds carrier information allocated to the handover request to the handover request response signaling returned to the wakeup E, and the MME will The handover request response signaling is sent to the source eNB.
  • FIG. 4 is a flowchart of a second embodiment of a multi-carrier cell handover method according to the present invention.
  • Step 401 Add at least one carrier information to the handover request signaling sent by the source cell to the at least one target cell.
  • Step 402 Parse the information that the target cell in the received handover request response signaling allocates a carrier to the handover request.
  • Step 403 Add, according to the parsing result, information about the target cell allocation carrier in a handover command sent to the UE of the UE.
  • Step 404 Switch the UE to a corresponding carrier of the corresponding target cell according to the information in the allocated carrier.
  • multi-carrier cell handover can be performed in a multi-carrier system, and the UE is switched to multiple carriers of the neighboring cell.
  • FIG. 5 is a flowchart of a third embodiment of a multi-carrier cell handover method according to the present invention.
  • Step 501 Add information of at least one carrier of the UE to the handover request signaling sent to the target cell.
  • Step 502 Parse the information of the target cell allocation carrier in the handover request response signaling returned by the received target cell.
  • Step 503 Add information about the target cell allocation carrier to the handover command signaling sent to the UE.
  • Step 504 Switch the UE to a carrier allocated by the target cell according to the information of the allocated carrier.
  • FIG. 6 is a flowchart of a fourth embodiment of a multi-carrier cell handover method according to the present invention.
  • Step 601 Add information of at least one carrier of the UE to the handover request signaling sent to the multiple target cells.
  • Step 602 Analyze information of the plurality of target cell allocation carriers in the received handover request response signaling returned by the plurality of target cells.
  • Step 603 Add information of the plurality of target cell allocation carriers to the handover command signaling sent to the UE.
  • Step 604 Switch the UE to a carrier allocated by a plurality of target cells according to the information of the allocated carrier.
  • the source cell and the target cell communicate through the source eNB and the X2 interface of the target eN B.
  • the selected at least one carrier information is added to the handover request signaling sent by the source eNB to the mobility management entity ( ⁇ E).
  • the MME sends the handover request signaling to the eNB of the target cell, and the eNB of the target cell adds the carrier information allocated to the handover request to the handover request response signaling returned to the wakeup E, and the MME will The handover request response signaling is sent to the source eNB.
  • the information about adding the target cell or the plurality of target cell allocation carriers in the handover command signaling sent to the UE includes: power information of the carrier.
  • FIG. 7 is a structural diagram of a first embodiment of a multi-carrier cell switching apparatus according to the present invention.
  • a receiving unit 701 is included, and the processing unit 702 is switched.
  • the receiving unit 701 is configured to receive an event-triggered measurement report reported by the UE served by the UE.
  • the handover processing unit 702 is configured to perform a handover decision according to the measurement report triggered by the plurality of events, and switch the UE to a corresponding target cell when receiving a plurality of event-triggered measurement reports within an estimated time interval. Corresponding carrier. .
  • the method further includes a selecting unit, configured to select, according to an output of the receiving unit, at least one carrier of the at least one target cell to the UE.
  • the handover processing unit 702 may be further configured to determine the The target cell corresponding to the carrier indicated in the measurement report is the same cell, and the UE is switched to the corresponding carrier of the corresponding target cell according to the judgment result.
  • the handover processing unit 702 calculates the estimated time interval ⁇ as follows:
  • ARSRQ RSRQ - RSRQ T ( 1 )
  • ⁇ ⁇ (4)
  • ⁇ ? the preset reference signal reception quality target value
  • ⁇ ⁇ the reference signal received power in the UE measurement report
  • AR the UE
  • the displacement in ⁇ time is the displacement velocity of the UE.
  • Both RSRQ and RSRQ 1 are available through the source eNB.
  • the system detection unit is further configured to determine, according to the measurement report, whether the UE belongs to the LTE system or the LTE-A system, and if it belongs to the LTE system, switch according to the handover procedure of the LTE system.
  • the method further includes a carrier frequency point detecting unit, and determining, according to the measurement report of the UE, whether the carrier frequency point used by the UE is a single frequency point, and if it is a single frequency point, according to L
  • the switching process of the TE system is switched.
  • FIG. 8 is a structural diagram of an embodiment of a handover processing unit according to the present invention.
  • the switch request module 801, the switch response module 802, and the UE setting module 803 are included.
  • the handover requesting module 801 is configured to add the selected at least one carrier information to the handover request signaling sent by the source cell to a target cell.
  • a target cell In this example, a certain source stored in the source cell
  • the target cell may support three carriers in the information of the target cell, and the information of the three carriers is added to the handover request signaling.
  • the handover request module 801 may also add the selected at least one carrier information to the handover request signaling sent to the multiple target cells, and the implementation is similar to the manner of transmitting the handover request signaling to one target cell.
  • the handover response module 802 is configured to parse information about a target cell allocated to the handover request in the received at least one handover request response signaling.
  • the target cell may only support two of the three carriers in the handover request signaling for some reason. Therefore, the currently supported carrier information is described in the handover request response signaling.
  • the handover response module 802 can also receive handover request response signaling of multiple target cells, and the parsing process is similar to the handover request response signaling of receiving a target cell.
  • the UE setting module 803 is configured to add the carrier power information allocated by the target cell to the handover command sent by the UE of the UE according to the analysis result of the handover response module 802. In this example, if the target cell is allocated 2 carriers, the power information of the two carriers is added to the handover command.
  • the handover request module 801 adds the selected at least one carrier information to the handover request signaling sent by the source eNB to the mobility management entity (MME).
  • MME mobility management entity
  • the MME sends the handover request signaling to the target eNB of the target cell, and the target eNB of the target cell adds the carrier information allocated to the handover request to the handover request response signaling returned to the wakeup E, where E sends the handover request response signaling to the source eNB.
  • the handover response module 802 is configured to parse the carrier information allocated by the target cell in the received handover request response signaling to the handover request.
  • the handover request module 801 adds the selection in a handover request signaling sent by a source eNB to a target eNB of a target cell. At least one carrier information.
  • the target eNB of the target cell joins the carrier information allocated to the handover request in the handover request response signaling returned to the source eNB.
  • the handover response module 802 is configured to parse the carrier information allocated by the target cell in the received handover request response signaling to the handover request.
  • FIG. 9 is a structural diagram of a second embodiment of a multi-carrier cell switching apparatus according to the present invention.
  • the switch request module 901, the switch response module 902, the UE setting module 903, and the switch processing module 904 are included.
  • the handover requesting module 901 is configured to add the selected at least one carrier information to a handover request signal sent by the source cell to a target cell.
  • the information of the target cell that is stored in the source cell may support three carriers, and the information of the three carriers is added to the handover request signaling.
  • the handover requesting module 901 may also add the selected at least one carrier information to the handover request signaling sent to the multiple target cells, and the implementation is similar to the manner of transmitting the handover request signaling to a target cell.
  • the handover response module 902 is configured to parse information about a target cell allocated to the handover request in the received at least one handover request response signaling.
  • the target cell may only support two of the three carriers in the handover request signaling for some reason. Therefore, the currently supported carrier information is described in the handover request response signaling.
  • the handover response module 902 can also receive handover request response signaling of multiple target cells, and the parsing process is similar to the handover request response signaling of receiving a target cell.
  • the UE setting module 903 is configured to add the carrier power information allocated by the target cell to the handover command sent by the UE of the UE according to the analysis result of the handover response module 902. In this example, if the target cell is allocated 2 carriers, the power information of the two carriers is added to the handover command.
  • the handover processing module 904 is configured to switch the UE to a corresponding carrier of a corresponding target cell according to the information in the allocated carrier.
  • the handover requesting module 901 adds the selected at least one carrier information to the handover request signaling sent by the source eNB to the mobility management entity (MME).
  • MME mobility management entity
  • the MME sends the handover request signaling to the target eNB of the target cell, and the target eNB of the target cell adds carrier information allocated to the handover request to the handover request response signaling returned to the E, where the MME is Transmitting the handover request response signaling to the source eNB.
  • the handover response module 902 is configured to parse the carrier information allocated by the target cell in the received handover request response signaling to the handover request.
  • the handover requesting module 901 adds the selection to a handover request signaling sent by a source eNB to a target eNB of a target cell. At least one carrier information.
  • the target eNB of the target cell adds the carrier information allocated to the handover request to the handover request response signaling returned to the source eNB.
  • the handover response module 902 is configured to parse the carrier information allocated by the target cell in the received handover request response signaling to the handover request.
  • the present invention provides a multi-carrier switching system, which includes a multi-carrier switching apparatus, configured to receive an event-triggered measurement report reported by a UE served by the UE, and receive a plurality of event-triggered measurement reports within an estimated time interval. And performing a handover decision according to the measurement report triggered by the plurality of events, and switching the UE to a corresponding carrier of the corresponding target cell.
  • the beneficial effects of the embodiment of the present invention are that the signaling overload on the X2 interface is avoided, and the data can be estimated according to the simulated data.
  • the signaling load caused by the handover can be reduced by about 41%, and the source eNB can be saved.
  • the transmission power of the target eNB the transmission power of the handover can be reduced by about 41%.
  • the processing capability of the source eNB and the target eNB is saved.
  • the signaling load of the S1 interface is avoided, the processing capability of the E1 is saved, and the pressure of the core network is reduced.

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Description

一种多载波小区切换方法、 装置及*** 技术领域 本发明涉及无线网络通信领域， 具体的讲是一种多载波小区切换方法、 装置及***。 背景技术
在 LTE- A (LTE- Advance) ***， 载波聚合 （Carrier Aggregation) 技术 被采用后， LTE-A的一个 UE可以使用一个以上的载波。 通常聚合的情况可以 分为三种， 连续的载波聚合， 同一波段内不连续的载波聚合和不同波段内的 非连续的载波聚合。 未来的网络拓扑结构可以分为等覆盖的情况和不等覆盖 的情况。 等覆盖的情况是无论聚合怎样的载波， 它们的覆盖范围是一样的。 不等覆盖是不同的载波它们的发射功率是相同或者不相同， 但它们的覆盖不 相同。
在现有技术中，通常 UE测量邻小区的参考信号接收功率（ RSRP: Reference Signal Received Power) ， 判断邻小区 RSRP的值是否比服务小区 RSRP的值 好过一个偏移量， 如果满足以上条件则触发 A3事件并上报该事件触发的测量 报告， 服务小区收到该测量报告后可启动切换判决。
本发明的发明人在实现本发明的过程中， 发现现有技术至少存在以下不 足： 由于在 1^£_4***中， 小区可能使用多个载波， 由于不同载波的衰落情 况不一样， 在测量 RSRP时会对每个载波测量相应的 RSRP值， 从而可能会多 次触发 A3事件并启动切换判决， 因此会浪费网络设备的资源。 发明内容
本发明的目的在于提供一种多载波小区切换方法、 装置及***， 用于解 决现有技术中在多载波***中切换判决频繁的问题。
为了解决上述现有问题， 本发明实施例提供了一种多载波小区切换方法， 该方法包括： 源小区接收用户设备 （UE ) 的事件触发的测量报告， 给所述 UE 选择至少一个目标小区的至少一个载波； 在一估计时间间隔内收到复数个事 件触发的测量报告时， 判断所述载波的测量报告中目标小区是否为同一小区； 根据所述判断结果将所述 UE切换到相应目标小区的相应载波。
为了解决上述现有问题， 本发明实施例还提供了一种多载波小区切换方 法， 所述方法包括： UE在多载波小区间进行切换时， 在源小区向至少一个目 标小区发送的切换请求信令中加入至少一个载波信息； 解析接收到的切换请 求响应信令中的目标小区对所述切换请求分配载波的信息； 根据所述解析结 果， 在向用户端的 UE发送的切换命令中加入所述目标小区分配载波的信息； 根据所述分配载波中的信息， 将 UE切换到相应目标小区的相应载波。
为了解决上述现有问题， 本发明实施例还提供了一种多载波切换装置， 该装置包括： 接收单元， 用于接收 UE的事件触发的测量报告； 选择单元， 用 于给所述 UE选择至少一个目标小区的至少一个载波； 判断单元， 用于在一估 计时间间隔内收到复数个事件触发的测量报告时， 判断所述载波的测量报告 中目标小区是否为同一小区； 切换处理单元， 用于将所述 UE切换到相应目标 小区的相应载波。
为了解决上述现有问题， 本发明实施例还提供了一种多载波切换装置， 该装置包括： UE在多载波小区间进行切换时， 切换请求模块， 用于在源小区 向至少一个目标小区发送的切换请求信令中加入至少一个载波信息； 切换响 应模块， 用于解析接收到的切换请求响应信令中的目标小区对所述切换请求 分配载波的信息； UE设定模块， 用于根据所述切换响应模块的解析结果， 在 向用户端的 UE发送的切换命令中加入所述目标小区分配载波的信息； 切换处 理模块， 用于根据所述分配载波中的信息， 将所述 UE切换到相应目标小区的 相应载波。
为了解决上述现有问题， 本发明实施例还提供了一种多载波切换***， 该***包括多载波切换装置， 用于接收其服务的 UE上报的事件触发的测量报 告， 并在一估计时间间隔内收到复数个事件触发的测量报告时， 根据所述复 数个事件触发的测量报告执行切换判决， 将所述 UE切换到相应目标小区的相 应载波。
本发明的实施例的有益效果在于， 由于考虑了多载波***中触发事件的 延迟问题， 通过估计时间间隔和测量报告的信息能够针对不同的切换情况进 行批切换处理和并行切换处理， 节省了源 eNB和目标 eNB的资源， 提高切换 效率。 附图说明
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 并不构成对本发明的限定。 在附图中：
图 1所示为本发明多载波小区切换方法第一实施例的流程图；
图 2所示为本发明将 UE进行批切换处理方法的实施例流程图； 图 3所示为本发明将 UE进行并行切换处理方法的实施例流程图； 图 4所示为本发明一种多载波小区切换方法第二实施例流程图； 图 5所示为本发明一种多载波小区切换方法第三实施例流程图； 图 6所示为本发明一种多载波小区切换方法第四实施例流程图； 图 7所示为本发明多载波小区切换装置第一实施例的结构图；
图 8所示为本发明切换处理单元实施例结构图；
图 9所示为本发明多载波小区切换装置第二实施例的结构图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚明白， 下面结合实施方式 和附图， 对本发明做进一歩详细说明。 在此， 本发明的示意性实施方式及其 说明用于解释本发明， 但并不作为对本发明的限定。
本发明实施例提供一种多载波小区切换方法、 装置及***。 以下结合附 图对本发明进行详细说明。
在长期演进 （LTE ) ***中， 切换过程为： 首先用户设备 （UE ) 的无线条 件发生改变， UE对当前所在小区的邻小区进行测量后， 向源小区发送测量报 告， 其中， 该当前所在小区即为源小区； 然后， 源小区根据测量报告作出判 决， 确定 UE要切换到的目标小区， 通知目标小区做好切换准备， 向 UE发送 切换命令； 其次， 接收到切换命令的 UE断开与源小区的连接， 同步到目标小 区后， 在目标小区上开始收发用户数据； 最后， 目标小区通知 UE源小区释放 UE所占用的资源。
如图 1所示为本发明多载波小区切换方法第一实施例的流程图。
步骤 101， 源小区接收其服务的用户设备（UE )上报的事件触发的测量报 告- 步骤 102， 在一估计时间间隔内收到复数个事件触发的测量报告时， 根据 所述复数个事件触发的测量报告执行切换判决， 将所述 UE切换到相应目标小 区的相应载波。
作为本发明的一个实施例， 在所述源小区接收其服务的 UE上报的事件触 发的测量报告之后还包括： 根据所述测量报告和所述源小区上存储的邻小区 信息选择至少一个目标小区的至少一个载波。
作为本发明的一个实施例， 所述测量报告包括触发该测量报告的事件的 标识信息， 该 UE测量的目标小区的载波信息和相应的测量值， 目标小区的标 ^口 自
作为本发明的一个实施例， 所述测量值包括该 UE测量得到的 RSRP , 参考 信号接收质量 （RSRQ: Reference Signal Rece ived Qual ity ) 。
作为本发明的一个实施例， 选择至少一个目标小区的至少一个载波频点 步骤中包括， 根据所述测量报告和所述源小区上存储的邻小区信息进行选择。
作为本发明的一个实施例， 所述估计时间间隔 的计算方法如下：
ARSRQ = RSRQ - RSRff ( 1 ) RSRP ^ RSRP
ARSRP = ARSRQ · RSSI = ARSRQ = [RSRQ - RSRQT
RSRQ 、 ' RSRQ
AR = l ^ (3) AT = ψ (4) 其中， 为 UE测量报告中的参考信号接收质量， 为预设的参考 信号接收质量目标值， Λ ^为该 UE测量报告中的参考信号接收功率， AR为 该 UE在 ΔΤ时间内的位移， 为该 UE的位移速度。
RSRQ和 RSRQT均可以通过源 eNB获得。
作为本发明的一个实施例， 在所述步骤 102中， 还具有一门限值 ΔΤ^^ , 例如该门限值为 20ms (毫秒）。如果所述 Δ7;大于所述 Δ¾_¾。Μ， 则令所述 Δ?; = ， 其中 Δ7^¾。Μ可以通过源 eNB获得。
作为本发明的一个实施例， 在所述歩骤 102之前还包括， 判断所述 UE是 属于 LTE***还是属于 LTE— A***， 如果属于 LTE***则按照 LTE***的切 换流程进行切换。
作为本发明的一个实施例， 在上述判断 UE所述***的步骤之后或者在所 述步骤 102之前还包括， 根据所述 UE的测量报告， 判断该 UE所使用的载波 频点是否为单频点， 如果为单频点则按照 LTE***的切换流程进行切换。
作为本发明的一个实施例， 所述 UE 的事件触发的测量报告包括触发 A3 事件时进行的测量报告。
作为本发明的一个实施例， 在所述步骤 102 中还包括， 判断这些测量报 告中指示的载波相应的目标小区是否为同一小区， 如果判断结果为同一小区 则将所述 UE切换到所述目标小区的相应载波， 即进行批切换处理； 否则将所 述 UE切换到相应目标小区的相应载波， 即进行并行切换处理。
作为本发明的一个实施例， 所述批切换处理包括： 在向所述一个目标小 区发送的切换请求信令中加入所述选择的载波信息， 通常为复数个载波信息， 也可以只有一个载波信息； 在接收到的目标小区返回的切换请求响应信令中 解析所述目标小区分配的载波信息， SP， 该目标小区当前允许使用的载波信 息， 例如如果目标小区具有 3 个载波， 但是由于负载原因， 该切换请求只能 在 2 个载波中进行切换， 则该目标小区在切换请求响应信令中加入的分配载 波的信息只包括所述的 2个载波信息； 在向所述 UE发送的切换命令信令中加 入所述分配载波的信息； 将所述 UE切换到目标小区分配的载波上。
作为本发明的一个实施例， 所述并行切换处理包括： 在向复数个目标小 区发送的切换请求信令中加入所述选择的载波信息， 同样， 通常为复数个载 波信息， 也可以只有一个载波信息； 在接收到的复数个目标小区返回的切换 请求响应信令中解析所述复数个目标小区分配的载波信息； 在向所述 UE发送 的切换命令信令中加入所述复数个目标小区分配的相应载波信息； 将所述 UE 切换到复数个目标小区分配的分配载波上。
作为本发明的一个实施例， 所述源小区和目标小区的切换通过源 eNB和 目标 eNB的 X2接口通信， 或者通过分别与所述源 eNB和目标 eNB相连接的移 动性管理实体 （匪 E) 进行通信。
通过上述实施例， 可以根据估计时间间隔和目标小区信息控制 UE的小区 切换， 从而减少多次切换判决的资源消耗。
如图 2所示为本发明将 UE进行批切换处理方法的实施例流程图。
步骤 201， 测量控制 （measurement control ) ， 所述源 eNB向 UE下发一些 测量的频点和控制信息。
步骤 202， UE向所述源 eNB返回测量报告 （measurement reports ) 。
服务小区源 eNB对 UE进行上行分配（UL al location) , 使 UE在分配的上行 资源上进行测量报告的上报。
步骤 203， 所述源 eNB进行切换判决 ( handover decision) ， 源 eNB对测 量报告进行处理， 进行目标小区的切换判决。
具体处理如实施例一所示。 步骤 204， 源 eNB向目标 eNB发送切换请求 （handover request ) ， 该切换 请求中包括至少一个载波的信息， 即包括 UE需要在哪些载波上进行切换。
步骤 205， 目标 eNB进行接纳控制 （admission control ) ： 目标 eNB根据 本小区当前的资源状况进行接纳控制， 决定分配给该切换请求的载波。
步骤 206， 目标 eNB进行切换请求响应（handover request acknowledge )， 目标 eNB对切换请求进行反馈， 将实际分配的载波信息传给源 eNB。
步骤 207， 源 eNB向 UE发送切换命令 （handover command) 。
源 eNB为 UE进行下行分配 （DL al location ) ， 用来下发切换命令， 包含 分配的载波信息和功率等信息。
步骤 208， 源 eNB向目标 eNB进行序列号状态传输（SN status transfer ) ， 源 eNB将传输的数据转发给目标 eNB, 目标 eNB将这些数据包缓存。
步骤 209， UE向目标 eNB发送同步信令（synchronisation ) ， UE和目标 eNB 进行同歩。
步骤 2 1 0 ， 目 标 e N B 向 U E发送上行分配和时间提前信息 (UL allocation+TA) 。
步骤 211， UE向目标 eNB发送切换确认信令 (handover confirm) 。 如图 3所示为本发明将 UE进行并行切换处理方法的实施例流程图。
步骤 301， 所述源 eNB向 UE下发测量控制信令， 所述测量控制信令包括测 量的频点和控制信息。
步骤 302， UE向所述源 eNB返回测量报告， 服务小区源 eNB对 UE进行上行分 配， 使 UE在分配的上行资源上进行测量报告的上报。
步骤 303， 所述源 eNB进行切换判决， 源 eNB对测量报告进行处理， 进行目 标小区的切换判决。
具体处理如实施例一所示。
步骤 304， 源 eNB向目标 eNBl发送切换请求， 该切换请求中包括至少一个 载波的信息， 即包括 UE需要在哪些载波上进行切换。 步骤 305， 源 eNB向目标 eNB2发送切换请求， 该切换请求中包括至少一个 载波的信息， 即包括 UE需要在哪些载波上进行切换。
步骤 306， 目标 eNBl进行接纳控制： 目标 eNBl根据本小区当前的资源状况 进行接纳控制， 决定分配给该切换请求的载波。
步骤 307， 目标 eNBl进行切换请求响应， 目标 eNBl对切换请求进行反馈， 将实际分配的载波信息传给源 eNB。
步骤 308， 目标 eNBl进行接纳控制： 目标 eNB2根据本小区当前的资源状况 进行接纳控制， 决定分配给该切换请求的载波。
步骤 309， 目标 eNB2进行切换请求响应， 目标 eNB2对切换请求进行反馈， 将实际分配的载波信息传给源 eNB。
步骤 310， 源 eNB向 UE发送切换命令， 源 eNB为 UE进行下行分配， 用来下发 切换命令， 包含分配的载波信息和功率等信息。
步骤 311， 源 eNB向目标 eNBl进行序列号状态传输， 源 eNB将传输的数据转 发给目标 eNBl , 目标 eNBl将这些数据包缓存。
步骤 312， 源 eNB向目标 eNB2进行序列号状态传输， 源 eNB将传输的数据转 发给目标 eNB2， 目标 eNBl将这些数据包缓存。
步骤 313， UE向目标 eNBl发送同步信令， UE和目标 eNBl进行同步。
步骤 314， UE向目标 eNB2发送同步信令， UE和目标 eNB2进行同步。
步骤 315， 目标 eNBl向 UE发送上行分配和时间提前信息。
步骤 3 1 6 ， 目 标 e N B 2 向 U E发送上行分配和时间提前信息 (UL allocation+TA) 。
步骤 317， UE向目标 eNBl发送切换确认信令。
步骤 318， UE向目标 eNB2发送切换确认信令。
作为本发明的一个实施例， 上述源 eNB和目标 eNB之间通过 X2接口传送 上述信令。
作为本发明的一个实施例， 在源 eNB向移动性管理实体 （匪 E) 发送的切 换请求信令中加入所述选择的至少一个载波信息。 所述 ME将所述切换请求 信令发送给目标小区的 eNB ,所述目标小区的 eNB在向醒 E返回的切换请求响 应信令中加入对该切换请求分配的载波信息， 所述匪 E将所述切换请求响应 信令发送给源 eNB。
如图 4所示为本发明一种多载波小区切换方法第二实施例流程图。
UE在多载波小区间进行切换时：
步骤 401，在源小区向至少一个目标小区发送的切换请求信令中加入至少 一个载波信息。
步骤 402，解析接收到的切换请求响应信令中的目标小区对所述切换请求 分配载波的信息。
步骤 403， 根据所述解析结果， 在向用户端的 UE发送的切换命令中加入 所述目标小区分配载波的信息。
步骤 404， 根据所述分配载波中的信息， 将 UE切换到相应目标小区的相 应载波。
通过上述实施例， 可以在多载波***中进行多载波的小区切换， 将 UE切 换到相邻小区的多个载波上。
如图 5所示为本发明一种多载波小区切换方法第三实施例流程图。
步骤 501， 在向所述一个目标小区发送的切换请求信令中加入所述 UE的 至少一个载波的信息。
步骤 502，在接收到的目标小区返回的切换请求响应信令中解析所述目标 小区分配载波的信息。
步骤 503， 在向所述 UE发送的切换命令信令中加入所述目标小区分配载 波的信息。
步骤 504， 根据所述分配载波的信息将所述 UE切换到目标小区分配的载 波上。
如图 6所示为本发明一种多载波小区切换方法第四实施例流程图。 步骤 601， 在向复数个目标小区发送的切换请求信令中加入所述 UE的至 少一个载波的信息。
步骤 602，在接收到的复数个目标小区返回的切换请求响应信令中解析所 述复数个目标小区分配载波的信息。
步骤 603， 在向所述 UE发送的切换命令信令中加入所述复数个目标小区 分配载波的信息。
步骤 604， 根据所述分配载波的信息将所述 UE切换到复数个目标小区分 配的载波上。
作为本发明的一个实施例， 所述源小区和目标小区通过源 eNB和目标 eN B的 X2接口通信。
作为本发明的一个实施例， 在源 eNB向移动性管理实体 （匪 E) 发送的切 换请求信令中加入所述选择的至少一个载波信息。 所述 MME将所述切换请求 信令发送给目标小区的 eNB,所述目标小区的 eNB在向醒 E返回的切换请求响 应信令中加入对该切换请求分配的载波信息， 所述匪 E将所述切换请求响应 信令发送给源 eNB。
作为本发明的一个实施例， 在向所述 UE发送的切换命令信令中加入所述 目标小区或者复数个目标小区分配载波的信息包括： 载波的功率信息。
如图 7所示为本发明多载波小区切换装置第一实施例的结构图。
包括接收单元 701， 切换处理单元 702。
所述接收单元 701， 用于接收其服务的 UE上报的事件触发的测量报告。 所述切换处理单元 702，用于在一估计时间间隔内收到复数个事件触发的 测量报告时， 根据所述复数个事件触发的测量报告执行切换判决， 将所述 UE 切换到相应目标小区的相应载波。 。
作为本发明的一个实施例， 还包括选择单元， 用于根据所述接收单元的 输出给所述 UE选择至少一个目标小区的至少一个载波。
作为本发明的一个实施例， 所述切换处理单元 702 还可以用于判断所述 测量报告中指示的载波相应的目标小区是否为同一小区， 并根据判断结果将 所述 UE切换到相应目标小区的相应载波。 作为本发明的一个实施例， 所述切 换处理单元 702采用如下方式计算所述估计时间间隔 ΔΤ :
ARSRQ = RSRQ - RSRQT ( 1 )
ARSRP = ARSRQ · RSSI = ARSRQ · RSRP = (RSRQ - RSRQT ) RSRP (2)
RSRQ 'RSRQ
AR = 10^^ (3)
ΛΓ = ^ (4) 其中， 为 UE测量报告中的参考信号接收质量， ^ ? 为预设的参考 信号接收质量目标值， Λ ^为该 UE测量报告中的参考信号接收功率， AR为 该 UE在 ΔΤ时间内的位移， 为该 UE的位移速度。
RSRQ和 RSRQ1均可以通过源 eNB获得。
作为本发明的一个实施例， 所述切换处理单元 702 还可以用于比较所述 计算模块输出的 与门限值 Δ7_。ω， 如果所述 Δ7;大于所述 Δ7_。ω， 贝 I」令所 述 Ar = A„。
作为本发明的一个实施例， 还包括***检测单元， 用于根据所述测量报 告判断所述 UE是属于 LTE***还是属于 LTE— A***， 如果属于 LTE***则 按照 LTE***的切换流程进行切换。
作为本发明的一个实施例， 还包括载波频点检测单元， 根据所述 UE的测 量报告， 判断该 UE所使用的载波频点是否为单频点， 如果为单频点则按照 L
TE***的切换流程进行切换。
如图 8所示为本发明切换处理单元实施例结构图。
包括切换请求模块 801， 切换响应模块 802， UE设定模块 803。
所述切换请求模块 801，用于在源小区向一个目标小区发送的切换请求信 令中加入所述选择的至少一个载波信息。 在本例中， 源小区存储的某一个目 标小区的信息中该目标小区可能支持 3 个载波， 在所述切换请求信令中加入 这 3个载波的信息。 所述切换请求模块 801也可以在向多个目标小区发送的 切换请求信令中加入所述选择的至少一个载波信息， 其实施与向一个目标小 区发送切换请求信令的处理方式相似。
所述切换响应模块 802，用于解析接收到的至少一个切换请求响应信令中 的目标小区对该切换请求分配载波的信息。 在本例中， 目标小区可能由于某 种原因当前只能支持切换请求信令中 3个载波中的 2个载波， 所以在所述切 换请求响应信令中说明其当前支持的载波信息。 所述切换响应模块 802 也可 以接收多个目标小区的切换请求响应信令， 其解析处理与接收一个目标小区 的切换请求响应信令相似。
所述 UE设定模块 803， 用于根据所述切换响应模块 802的解析结果， 在 向用户端的 UE发送的切换命令中加入所述目标小区分配的载波功率信息。 在 本例中， 如上述目标小区分配了 2 个载波， 则在所述切换命令中加入这两个 载波的功率信息。
作为本发明的一个实施例， 当所述源小区和所述目标小区不具有 X2接口 时：
所述切换请求模块 801， 在源 eNB向移动性管理实体 （MME) 发送的切换 请求信令中加入所述选择的至少一个载波信息。
所述 MME将所述切换请求信令发送给目标小区的目标 eNB,所述目标小区 的目标 eNB在向醒 E返回的切换请求响应信令中加入对该切换请求分配的载 波信息， 所述匪 E将所述切换请求响应信令发送给源 eNB。
所述切换响应模块 802，用于解析接收到的切换请求响应信令中的目标小 区对该切换请求分配的载波信息。
作为本发明的一个实施例，当所述源小区和所述目标小区具有 X2接口时: 所述切换请求模块 801，在源 eNB向目标小区的目标 eNB发送的切换请求 信令中加入所述选择的至少一个载波信息。 所述目标小区的目标 eNB在向所述源 eNB返回的切换请求响应信令中加 入对该切换请求分配的载波信息。
所述切换响应模块 802，用于解析接收到的切换请求响应信令中的目标小 区对该切换请求分配的载波信息。
如图 9所示为本发明多载波小区切换装置第二实施例的结构图。
包括切换请求模块 901， 切换响应模块 902， UE设定模块 903， 切换处理 模块 904。
所述切换请求模块 901，用于在源小区向一个目标小区发送的切换请求信 令中加入所述选择的至少一个载波信息。 在本例中， 源小区存储的某一个目 标小区的信息中该目标小区可能支持 3 个载波， 在所述切换请求信令中加入 这 3个载波的信息。 所述切换请求模块 901也可以在向多个目标小区发送的 切换请求信令中加入所述选择的至少一个载波信息， 其实施与向一个目标小 区发送切换请求信令的处理方式相似。
所述切换响应模块 902，用于解析接收到的至少一个切换请求响应信令中 的目标小区对该切换请求分配载波的信息。 在本例中， 目标小区可能由于某 种原因当前只能支持切换请求信令中 3个载波中的 2个载波， 所以在所述切 换请求响应信令中说明其当前支持的载波信息。 所述切换响应模块 902 也可 以接收多个目标小区的切换请求响应信令， 其解析处理与接收一个目标小区 的切换请求响应信令相似。
所述 UE设定模块 903， 用于根据所述切换响应模块 902的解析结果， 在 向用户端的 UE发送的切换命令中加入所述目标小区分配的载波功率信息。 在 本例中， 如上述目标小区分配了 2 个载波， 则在所述切换命令中加入这两个 载波的功率信息。
所述切换处理模块 904， 用于根据所述分配载波中的信息， 将所述 UE切 换到相应目标小区的相应载波。
作为本发明的一个实施例， 当所述源小区和所述目标小区不具有 X2接口 时：
所述切换请求模块 901， 在源 eNB向移动性管理实体 （MME) 发送的切换 请求信令中加入所述选择的至少一个载波信息。
所述 MME将所述切换请求信令发送给目标小区的目标 eNB,所述目标小区 的目标 eNB在向 E返回的切换请求响应信令中加入对该切换请求分配的载 波信息， 所述匪 E将所述切换请求响应信令发送给源 eNB。
所述切换响应模块 902，用于解析接收到的切换请求响应信令中的目标小 区对该切换请求分配的载波信息。
作为本发明的一个实施例，当所述源小区和所述目标小区具有 X2接口时: 所述切换请求模块 901，在源 eNB向目标小区的目标 eNB发送的切换请求 信令中加入所述选择的至少一个载波信息。
所述目标小区的目标 eNB在向所述源 eNB返回的切换请求响应信令中加 入对该切换请求分配的载波信息。
所述切换响应模块 902，用于解析接收到的切换请求响应信令中的目标小 区对该切换请求分配的载波信息。
本发明提供一种多载波切换***， 该***包括多载波切换装置， 用于接 收其服务的 UE上报的事件触发的测量报告， 并在一估计时间间隔内收到复数 个事件触发的测量报告时， 根据所述复数个事件触发的测量报告执行切换判 决， 将所述 U E切换到相应目标小区的相应载波。
本发明的实施例的有益效果在于， 避免 X2接口上的信令过载， 根据仿真 的数据可以推算， 采用该方法后， 对切换造成的信令负荷而言， 可以减低约 41%， 节约源 eNB和目标 eNB的发射功率， 对切换造成的信令负荷而言， 其发 射功率可以被减低约 41%。 节约源 eNB和目标 eNB的处理能力， 对于基于 S1 接口的切换， 避免 S1接口的信令负荷， 节约匪 E的处理能力， 减少核心网的 压力。
以上所述的具体实施方式， 对本发明的目的、 技术方案和有益效果进行 了进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施方式而 已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之内， 所做 的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种多载波小区切换方法， 其特征在于该方法包括：
源小区接收其服务的用户设备 UE上报的事件触发的测量报告； 在一估计时间间隔内收到复数个事件触发的测量报告时， 根据所述复数 个事件触发的测量报告执行切换判决， 将所述 UE切换到相应目标小区的相应 载波。
2.根据权利要求 1 所述的方法， 其特征在于， 所述测量报告包括触发该 测量报告的事件的标识信息， 该 UE测量的目标小区的载波信息和相应的测量 值， 目标小区的标识信息。
3.根据权利要求 1 所述的方法， 其特征在于， 在所述源小区接收其服务 的用户设备 UE上报的事件触发的测量报告之后还包括： 根据所述测量报告和 所述源小区上存储的邻小区信息选择至少一个目标小区的至少一个载波。
4.根据权利要求 1所述的方法， 其特征在于， 所述估计时间间隔 ΔΓ采用 下述方式计算：
ARSRQ = RSRQ - RSRQT ( 1 )
RSRP ( T \ RSRP / n、
ARSRP ^ ARSRQ ■ RSSI ^ ARSRQ = [RSRQ - RSRQT ) (2)
RSRQ 'RSRQ
AR = 10 376 (3)
其中， 为 UE测量报告中的参考信号接收质量， 为预设的参考 信号接收质量目标值， Λ ^为 UE测量报告中的参考信号接收功率， AR为 在 时间内的位移， 为 UE的位移速度。
5.根据权利要求 4所述的方法， 其特征在于， 在一估计时间间隔内收到 复数个事件触发的测量报告中还包括： 还具有一门限值 A ;te¾。w， 判断所述 是否大于所述 T一， 如果大于所述门限值 Tthreshold则令所述 ΔΓ = MthrMd。
6.根据权利要求 1 所述的方法， 其特征在于， 在一估计时间间隔内收到 复数个事件触发的测量报告之前还包括， 判断所述 UE是属于 LTE***还是属 于 LTE— A***， 如果属于 LTE***， 则按照 LTE***的切换流程进行切换； 如果属于 LTE-A***， 则继续执行所述接收测量报告的处理。
7.根据权利要求 6所述的方法， 其特征在于， 在上述判断 UE所属***为 LTE-A***之后和 /或在一估计时间间隔内收到复数个事件触发的测量报告之 前还包括， 根据所述 UE的测量报告， 判断该 UE所使用的载波频点是否为单 频点， 如果为单频点则按照 LTE ***的切换流程进行切换； 否则， 继续执行 所述接收测量报告的处理。
8.根据权利要求 1 所述的方法， 其特征在于， 根据所述复数个事件触发 的测量报告执行切换判决，将所述 UE切换到相应目标小区的相应载波，包括： 判断所述载波的测量报告中目标小区是否为同一小区， 如果判断结果为同一 小区则将所述 UE切换到所述目标小区的相应载波上； 否则将所述 UE切换到 复数个目标小区的相应载波上。
9. 根据权利要求 8所述的方法， 其特征在于， 所述将所述 UE切换到所 述目标小区的相应载波包括： 在向所述的一个目标小区发送的切换请求信令 中加入所述选择的载波信息； 在接收到的所述目标小区返回的切换请求响应 信令中解析所述目标小区分配载波的信息； 在向所述 UE发送的切换命令信令 中加入所述分配载波的信息； 将所述 UE切换到目标小区分配的载波上。
10. 根据权利要求 8所述的方法， 其特征在于， 所述将所述 UE切换到复 数个目标小区的相应载波包括， 在向复数个目标小区发送的切换请求信令中 加入所述选择的载波信息； 在接收到的复数个目标小区返回的切换请求响应 信令中解析所述复数个目标小区分配载波的信息； 在向所述 UE发送的切换命 令信令中加入所述复数个目标小区分配的载波信息； 将所述 UE切换到复数个 目标小区分配的载波上。
11. 一种多载波小区切换方法， 其特征在于所述方法包括：
在 UE进行多载波小区间切换时， 在源小区向至少一个目标小区发送的切 换请求信令中加入至少一个载波信息；
解析接收到的切换请求响应信令中的目标小区对所述切换请求分配载波 的信息；
根据所述解析结果， 在向用户端的 UE发送的切换命令中加入所述目标小 区分配载波的信息；
根据所述分配载波中的信息， 将 UE切换到相应目标小区的相应载波。
12. 根据权利要求 11所述的方法， 其特征在于， 在向所述一个目标小区 发送的切换请求信令中加入所述 UE的至少一个载波的信息； 在接收到的目标 小区返回的切换请求响应信令中解析所述目标小区分配载波的信息； 在向所 述 UE发送的切换命令信令中加入所述目标小区分配载波的信息； 根据所述分 配载波的信息将所述 UE切换到目标小区分配的载波上。
13. 根据权利要求 11所述的方法， 其特征在于， 在向复数个目标小区发 送的切换请求信令中加入所述 UE的至少一个载波的信息； 在接收到的复数个 目标小区返回的切换请求响应信令中解析所述复数个目标小区分配载波的信 息； 在向所述 UE发送的切换命令信令中加入所述复数个目标小区分配载波的 信息； 根据所述分配载波的信息将所述 UE切换到复数个目标小区分配的载波 上。
14.一种多载波切换装置， 其特征在于该装置包括：
接收单元， 用于接收其服务的 UE上报的事件触发的测量报告； 切换处理单元， 用于在一估计时间间隔内收到复数个事件触发的测量报 告时， 根据所述复数个事件触发的测量报告执行切换判决， 将所述 UE切换到 相应目标小区的相应载波。
15. 根据权利要求 14所述的装置， 其特征在于， 还包括选择单元， 用于 根据所述接收单元的输出给所述 UE选择至少一个目标小区的至少一个载波。
16. 根据权利要求 14所述的装置， 其特征在于， 所述切换处理单元还用 于判断所述测量报告中指示的载波相应的目标小区是否为同一小区， 并根据 所述判断结果将所述 UE切换到相应目标小区的相应载波。
17. 根据权利要求 14所述的装置， 其特征在于， 所述切换处理单元使用 如下公式估计所述估计时间间隔 ΔΓ：
ARSRQ = RSRQ - RSRQT ( 1 )
RSRP ( T \ RSRP /0、
ARSRP = ARSRQ - RSSI = ARSRQ = [RSRQ - RSRQT ) (2)
RSRQ 'RSRQ
AR = 10 376 (3) AT =τ (4) 其中， Λ«¾为 UE测量报告中的参考信号接收质量， RSR^为预设的参考 信号接收质量目标值， 为 UE测量报告中的参考信号接收功率， 为 UE 在 ΔΓ时间内的位移， 为 UE的位移速度。
18. 根据权利要求 17所述的装置， 其特征在于， 所述切换处理单元还用 于比较所述计算模块输出的 ΔΓ与一预设的门限值 Tthreshold，如果所述 Δ ;大于所 述 Tthreshold， 则令所述 ΔΓ = ATthreshold。
19. 根据权利要求 14所述的装置， 其特征在于， 还包括***检测单元， 用于检测所述 UE是属于 LTE***还是属于 LTE— A***， 如果属于 LTE*** 则按照 LTE***的切换流程进行切换。
20. 根据权利要求 14所述的装置， 其特征在于， 还包括载波频点检测单 元， 根据判断该 UE所使用的载波频点是否为单频点， 如果为单频点则按照 L TE***的切换流程进行切换。
21. 根据权利要求 14所述的装置， 其特征在于， 所述切换处理单元还包 括： 切换请求模块， 用于在源小区向目标小区发送的切换请求信令中加入所 述选择的至少一个载波信息；
切换响应模块， 用于解析接收到的切换请求响应信令中的目标小区对该 切换请求分配载波的信息；
UE设定模块， 用于根据所述切换响应模块的解析结果， 在向用户端的 UE 发送的切换命令中加入所述目标小区分配的载波功率信息。
22.—种多载波切换装置， 其特征在于该装置包括：
在 UE进行多载波小区间切换时，
切换请求模块， 用于在源小区向至少一个目标小区发送的切换请求信令 中加入至少一个载波信息；
切换响应模块， 用于解析接收到的切换请求响应信令中的目标小区对所 述切换请求分配载波的信息；
UE设定模块， 用于根据所述切换响应模块的解析结果， 在向用户端的 UE 发送的切换命令中加入所述目标小区分配载波的信息；
切换处理模块， 用于根据所述分配载波中的信息， 将所述 UE切换到相应 目标小区的相应载波。
23. 一种多载波切换***， 其特征在于该***包括：
多载波切换装置， 该装置用于接收其服务的 UE上报的事件触发的测量报 告， 并在一估计时间间隔内收到复数个事件触发的测量报告时， 根据所述复 数个事件触发的测量报告执行切换判决， 将所述 UE切换到相应目标小区的相 应载波。
PCT/CN2009/070114 2009-01-12 2009-01-12 一种多载波小区切换方法、装置及*** WO2010078729A1 (zh)

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