WO2013131319A1 - 切换方法及装置、数据处理方法及装置 - Google Patents
切换方法及装置、数据处理方法及装置 Download PDFInfo
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- WO2013131319A1 WO2013131319A1 PCT/CN2012/075373 CN2012075373W WO2013131319A1 WO 2013131319 A1 WO2013131319 A1 WO 2013131319A1 CN 2012075373 W CN2012075373 W CN 2012075373W WO 2013131319 A1 WO2013131319 A1 WO 2013131319A1
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- base station
- sequence number
- pdcp
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- radio access
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 118
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 230000007774 longterm Effects 0.000 claims description 7
- 238000010295 mobile communication Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 10
- 230000011664 signaling Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 241000700159 Rattus Species 0.000 description 5
- 238000007726 management method Methods 0.000 description 5
- 238000012384 transportation and delivery Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
- H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
Definitions
- the present invention relates to the field of communications, and in particular to a handover method and apparatus, a data processing method, and an apparatus.
- EUTRAN evolved UMTS Territorial Radio Access Network
- LTE Long Term Evolution
- the Long Term Evolution (LTE) system supports this function not only to cover LTE cells of the same frequency, but also to cells using different frequencies, and cells of many other radio access technologies, however, in the evolution
- LTE Long Term Evolution
- the standards of different radio access technologies are different, for example, used in different radio access technologies (Radio Access Technology, RAT for short).
- Packet Data Convergence Protocol has different serial number.
- the number of bits of the PDCP sequence number of the source access network and the target access network is different, and the target access network cannot obtain The source access network's PDCP sequence number, therefore, the target access network cannot be correctly Forwarding handover source access network after receiving the data, resulting in data loss occurs switch, reducing the quality of the communication network between different radio access technology.
- the present invention provides a handover method and apparatus, a data processing method, and an apparatus, to at least solve the data caused by different standards of different radio access technologies when switching between different radio access technologies in the related art. Lost problem.
- a handover method including: a source base station sends a handover request to a target base station, where the handover request carries an uplink sequence number and/or a downlink sequence number of the PDCP, and the source base station and the target base station The radio access technology used is different.
- the source base station sends the data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station after receiving the acknowledgment message from the target base station.
- the source base station will use the UE (User Equipment). , user equipment) Switch to the target base station.
- the PDCP uplink sequence number is: Submode Dependent Convergence Protocol (abbreviated as Acknowledge Mode, abbreviated as AM) S DCP) The sequence number of the first unsuccessfully transmitted or unacknowledged PDU (Protocol Data Unit); The PDCP downlink sequence number is: In the determined mode, the PDCP/S DCP is sent to the upper sequence service data unit. (Service Data Unit, SDU for short) The next serial number of the serial number carried.
- Submode Dependent Convergence Protocol abbreviated as Acknowledge Mode, abbreviated as AM
- S DCP The sequence number of the first unsuccessfully transmitted or unacknowledged PDU (Protocol Data Unit);
- the PDCP downlink sequence number is: In the determined mode, the PDCP/S DCP is sent to the upper sequence service data unit. (Service Data Unit, SDU for short) The next serial number of the serial number carried.
- SDU Service Data Unit
- a data processing method including: receiving, by a target base station, a handover request sent by a source base station, where the handover request carries an uplink sequence number and/or a downlink sequence of a packet data convergence protocol PDCP No.
- the radio access technology used by the source base station and the target base station is different; the target base station receives data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station; and the target base station uses the radio access with the target base station.
- the uplink sequence number and/or the downlink sequence number of the PDCP that the technology matches, and the data is sent to the UE.
- the data processing method further includes: the target base station adopts the following manner Converting the uplink sequence number and/or the downlink sequence number of the PDCP into a sequence number that matches the radio access technology of the target base station:
- the radio access technology of the source base station is Long Term Evolution (LTE), and the radio access technology of the target base station
- LTE Long Term Evolution
- GSM Global System for Mobile Communication
- the radio access technology of the target base station is Time Division Synchronous Code Division Multiple Access (TD-CDMA), and the 12-bit serial number of the data bearer in the determining mode of the source base station is logically ANDed with 0xfi)0, and the obtained 16
- the matching sequence number if the radio access technology of the source base station is GSM, and the radio access technology of the target base station is LTE, determining the source base station determines the mode
- the 10-bit serial number of the data bearer is logically ANDed with 0x300, and the obtained 12-bit number is used as the matching sequence number. If the radio access technology of the source base station is TD-CDMA, the radio access technology of the target base station is LTE, and the determination is made.
- the source base station determines the lower 12-bit number of the 16-bit serial number of the data bearer in the mode as the matching sequence number.
- the PDCP uplink sequence number is: a sequence number of a first unsuccessful transmission or unacknowledged Protocol Data Unit (PDU) of the PDCP/subnetwork related convergence protocol S DCP in the acknowledge mode; PDCP The downlink sequence number is: In the determining mode, the PDCP/SNDCP sends the next sequence number of the sequence number carried by the sequence SDU of the upper layer.
- PDU Protocol Data Unit
- a switching apparatus including: a first sending module, configured to send a handover request to a target base station, where the handover request carries an uplink sequence number of the packet data convergence protocol PDCP and/or Or the downlink sequence number, the radio access technology used by the source base station and the target base station is different; the second sending module is configured to: after receiving the acknowledgement message of the target base station to the request, the uplink sequence number and/or the downlink sequence with the PDCP The data corresponding to the number is sent to the target base station; and the handover module is configured to switch the UE to the target base station.
- a first sending module configured to send a handover request to a target base station, where the handover request carries an uplink sequence number of the packet data convergence protocol PDCP and/or Or the downlink sequence number, the radio access technology used by the source base station and the target base station is different
- the second sending module is configured to: after receiving the acknowledgement message of the target base station to the request, the uplink sequence number and/or the down
- the PDCP uplink sequence number is: the sequence number of the first unsuccessful transmission or unacknowledged protocol data unit PDU of the PDCP/Subnet Related Convergence Protocol (S DCP) in the acknowledge mode; the PDCP downlink sequence number is: In the mode, the PDCP/S DCP sends the next sequence number of the sequence number carried by the sequence service data unit SDU of the upper layer.
- S DCP PDCP/Subnet Related Convergence Protocol
- a data processing apparatus including: a first receiving module, configured to receive a handover request sent by a source base station, where the handover request carries an uplink sequence number of a packet data convergence protocol PDCP And the downlink sequence number, the radio access technology used by the source base station and the target base station is different; the second receiving module is configured to receive data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station; The three sending module is configured to send the data to the UE by using an uplink sequence number and/or a downlink sequence number of the PDCP that matches the radio access technology of the target base station.
- a first receiving module configured to receive a handover request sent by a source base station, where the handover request carries an uplink sequence number of a packet data convergence protocol PDCP And the downlink sequence number, the radio access technology used by the source base station and the target base station is different
- the second receiving module is configured to receive data corresponding to the uplink sequence number and/or the downlink
- the data processing apparatus further includes: a processing module, configured to convert the uplink sequence number and/or the downlink sequence number of the PDCP into a sequence number matching the radio access technology of the target base station by one of the following methods:
- the radio access technology is long-term evolution LTE, and the radio access technology of the target base station is Global System for Mobile Communications (GSM), and the lower 10 positions of the 12-bit serial number of the data bearer in the source base station determining mode are determined as matching sequence numbers;
- the radio access technology of the source base station is LTE, and the radio access technology of the target base station is time division synchronous code division multiple access (TD-CDMA), and the 12-bit serial number of the data bearer in the determining mode of the source base station is determined to be composed of 0xfi)0.
- GSM Global System for Mobile Communications
- the 16-digit number is used as the matching serial number; if the radio access technology of the source base station is GSM, and the radio access technology of the target base station is LTE, the 10-bit serial number of the data bearer in the source base station determining mode and the 12-bit 0x300 are determined.
- the number is used as the matching sequence number; if the radio access technology of the source base station is TD-CDMA, and the radio access technology of the target base station is LTE, determining the source base station in the determining mode According to the low 16-bit 12-digit serial number of the carrier as the matching serial number.
- the PDCP uplink sequence number is: the sequence number of the first unsuccessful transmission or unacknowledged protocol data unit PDU of the PDCP/Subnet Related Convergence Protocol (S DCP) in the acknowledge mode; the PDCP downlink sequence number is: In the mode, the PDCP/SNDCP is sent to the next sequence number of the sequence number carried by the sequence service data unit SDU of the upper layer.
- S DCP PDCP/Subnet Related Convergence Protocol
- the source base station sends the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station by using the handover request, where the source base station and the target base station use different radio access technologies, and receive the target base station to send After the acknowledgment message is requested, the data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP is sent to the target base station. Therefore, the target base station can receive the source according to the received uplink sequence number and/or downlink sequence number of the PDCP.
- the data sent by the base station ensures that the target base station can correctly receive the data sent by the source base station, thereby completing the handover between the target base station and the source base station using the different radio access technologies, and solving the difference
- data loss due to different standards of different radio access technologies ensures that data is not lost during handover, and the communication quality of the network is improved.
- FIG. 1 is a flow chart of a handover method according to an embodiment of the present invention
- FIG. 2 is a schematic diagram showing mobility of an EUTRAN system to a UTRAN system according to an embodiment of the present invention
- FIG. 4 is a flowchart of a handover method by the EUTRAN system to the UTRAN system according to an embodiment of the present invention
- FIG. 5 is a handover method of the handover from the UTRAN system to the EUTRAN system according to an embodiment of the present invention.
- Figure 6 is a block diagram showing the structure of a switching device according to an embodiment of the present invention
- Figure 7 is a block diagram showing the structure of a data processing device according to an embodiment of the present invention
- Figure 8 is another data processing device according to an embodiment of the present invention.
- FIG. 1 is a flowchart of a handover method according to an embodiment of the present invention.
- the handover method includes steps S102 to S106.
- Step S102 The source base station sends a handover request to the target base station, where the handover request carries the uplink sequence number and/or the downlink sequence number of the packet data convergence protocol PDCP, and the radio access technologies used by the source base station and the target base station are different.
- Step S104 After receiving the confirmation message of the request by the target base station, the source base station sends data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station.
- Step S106 The source base station switches the UE to the target base station. The source base station sends the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station by using the handover request, where the source base station and the target base station use different radio access technologies, and receive the request sent by the target base station. After the acknowledgment message, the data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP is sent to the target base station.
- the target base station can receive the source base station according to the received uplink sequence number and/or downlink sequence number of the PDCP.
- the transmitted data ensures that the target base station can correctly receive the data sent by the source base station, thereby completing the handover between the target base station and the source base station using different radio access technologies, and solving the problem between different radio access technologies.
- data loss due to different standards of different wireless access technologies ensures that data is not lost during handover, and the communication quality of the network is improved.
- the terminal handover in the above embodiment is a mobility handover between different systems, for example, the EUTRAN system switches to the UTRAN system, that is, the terminal switches from the EUTRAN system to the UTRAN system, as shown in FIG.
- target 3G RNC and BTS Base Transceiver Station, referred to as base transceiver station
- base transceiver station Base Transceiver Station
- target 3G RNC and BTS Base Transceiver Station, referred to as base transceiver station
- target 3G RNC and BTS Base Transceiver Station, referred to as base transceiver station
- base transceiver station Base Transceiver Station
- nodes are represented by a box, which is associated with the target SGSN (Serving GPRS Support Node, referred to as the Serving GPRS Support Node) Connected, standard-oriented Universal Mobile Telecommunications System (UMTS) Iu interface, Serving-Gateway (S-GW) as a local mobility management entity for data plane data bearer, control plane
- the NAS signaling is moved from the source service mobility management entity (Mobile Management Entity, MME for short) to the target SGSN based on the S3 interface; and for the user plane, the new data channel is established between the S-
- the radio interface based on S1 user data and signaling
- the old resources and connections (indicated by dashed lines) will be released, user data and control signaling will be transmitted based on the newly established UMTS Iu interface.
- the handover from the UTRAN system to the EUTRAN system is also based on the S3 interface to implement control plane signaling.
- the above handover procedure is also applicable in the mobility for 2G/GPRS systems, since the SGSN exists in both the 2G and 3G packet core architectures.
- the PDCP uplink sequence number may be: In the acknowledge mode, the PDCP/S DCP The serial number of the first unsuccessfully transmitted or unacknowledged PDU; the PDCP downlink sequence number may be: In the determining mode, the PDCP/SNDCP is sent to the next sequence number of the sequence number carried by the upper layer sequential service data unit SDU.
- the PDCP uplink sequence number is the first unsuccessful transmission or not.
- the sequence number of the confirmed PDU is to ensure that the target base station can accurately receive the data sent by the terminal according to the PDCP uplink sequence number, and the PDCP downlink sequence number is the next sequence number of the serial number carried by the PDCP/S DCP to the upper SDU.
- the target base station can accurately forward the data forwarded by the source base station to the target base station according to the PDCP downlink sequence number, and then forward the data to the terminal again, thereby improving the accuracy of data transmission.
- This embodiment provides a data processing method. As shown in FIG. 3, the data processing method includes steps S302 to S306.
- Step S302 The target base station receives the handover request sent by the source base station, where the handover request carries the uplink sequence number and/or the downlink sequence number of the packet data convergence protocol PDCP, and the radio access technologies used by the source base station and the target base station are different.
- Step S304 The target base station receives data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station.
- Step S306 The target base station sends the data to the UE by using the uplink sequence number and/or the downlink sequence number of the PDCP that matches the radio access technology of the target base station.
- the target base station receives the uplink sequence number and/or the downlink sequence number of the PDCP sent by the target base station by using the handover request, where the source base station and the target base station adopt different radio access technologies, and receive the request sent by the source base station.
- the target base station may send the source base station according to the uplink sequence number and/or the downlink sequence number of the received PDCP.
- the data ensures that the target base station can correctly receive the data sent by the source base station, and sends the data to the terminal according to the uplink sequence number and/or the downlink sequence number of the PDCP that matches the radio access technology of the target base station, thereby completing the data.
- the UE switches between the target base station and the source base station that use different radio access technologies, and solves the problem of data loss caused by different standards of different radio access technologies when switching between different radio access technologies. It ensures that no data is lost during the handover, which improves the communication quality of the network.
- the target base station converts the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station to be matched with the radio access technology of the target base station before transmitting the data to the UE.
- the serial number in the preferred embodiment, provides a preferred conversion method.
- the radio access technology of the source base station is Long Term Evolution (LTE)
- the radio access technology of the target base station is Global System for Mobile Communications (GSM).
- LTE Long Term Evolution
- GSM Global System for Mobile Communications
- Determining, in the source base station determining mode, the lower 10 position of the 12-bit serial number of the data bearer is a sequence number matching the radio access technology of the target base station; if the radio access technology of the source base station is LTE, the radio access of the target base station
- the technology is Time Division Synchronous Code Division Multiple Access (TD-CDMA), which determines that the 12-bit serial number of the data bearer in the source base station determining mode is logically ANDed with Oxfi)0, and the obtained 16-bit number is used as the wireless connection with the target base station.
- TD-CDMA Time Division Synchronous Code Division Multiple Access
- the serial number of the incoming technology match; if the radio access technology of the source base station is GSM, the radio access technology of the target base station is LTE, Determining that the 10-bit serial number of the data bearer in the source base station determining mode is logically ANDed with 0x300, and the obtained 12-bit number is used as the sequence number matching the radio access technology of the target base station; if the radio access technology of the source base station is TD- In CDMA, the radio access technology of the target base station is LTE, and the lower 12-bit number of the 16-bit serial number of the data bearer in the source base station determining mode is determined as the sequence number matching the radio access technology of the target base station.
- the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station are converted into a sequence number that matches the radio access technology of the target base station, and the target base station is configured to send data to the terminal UE.
- Accuracy provides a method for converting the uplink sequence number and/or the downlink sequence number of the PDCP in various scenarios, which can meet the application requirements of different scenarios, thereby enhancing the applicability of the embodiment.
- the PDCP uplink sequence number can be: In the acknowledge mode, the PDCP/subnet related convergence The sequence number of the first unsuccessfully transmitted or unacknowledged PDU of the protocol S DCP; the PDCP downlink sequence number may be: In the determining mode, the PDCP/S DCP is sent to the upper sequence of the sequential service data unit SDU carrying the serial number A serial number.
- the PDCP uplink sequence number is the sequence number of the first unsuccessfully transmitted or unacknowledged PDU to ensure that the target base station can accurately receive the data sent by the terminal according to the PDCP uplink sequence number, and the PDCP downlink sequence number.
- the PDCP/SNDCP is sent to the next sequence number of the sequence number carried by the SDU of the upper layer to ensure that the target base station can accurately forward the data forwarded by the source base station to the target base station to the terminal according to the PDCP downlink sequence number, thereby improving the data. The accuracy of the delivery.
- Example 1 a handover method by the EUTRAN system to the UTRAN system is taken as an example.
- the handover method includes steps S402 to S420.
- Step S402 The source eNodeB makes a handover decision according to the real-time information, and prepares handover between different RATs.
- a handover request (Handover Required)
- Step S406 The source MME sends the session context and the uplink sequence number and/or the downlink sequence number of the source PDCP to the target SGSN by forwarding a Relocation Request.
- Step S408 The target SGSN sends a Relocation Request to the target RNC to request allocation of radio network resources, and sends the uplink sequence number and/or downlink sequence number of the source PDCP to the target RNC (Radio Network Controller, Radio Network Control). Device).
- Step S410 After completing the radio resource allocation, the target RNC returns a Relocation Request Acknowledge message to the target SGSN, and prepares to receive the downlink PDUs sent by the S-GW or the target SGSN.
- Step S412 The target SGSN sends a Forward Relocation Response (Forward Relocation Response) message to the source MME.
- the source eNodeB is still transmitting uplink and downlink user plane data (if there is data to be transmitted).
- Step S414 The source MME completes the preparation work before the handover, and sends a handover command message to the source eNodeB.
- Step S416 The source eNodeB sends a handover command message to the UE, where the message includes relevant radio parameters and information that the target RNC has established in the preliminary preparation phase.
- Step S418 The source eNodeB forwards the downlink data of the uncompleted transmission or the unacknowledged (acknowledgement mode) directly to the target SGSN.
- Step S420 After receiving the handover command message sent by the eNodeB, the UE completes the handover process of the UE from the EUTRAN system to the UTRAN system.
- Example 2 In this example, a handover method that is switched from the UTRAN system to the EUTRAN system is taken as an example. As shown in FIG.
- the handover method includes steps S502 to S520.
- Step S502 The source RNC makes a handover decision according to the real-time information, and prepares handover between different RATs.
- Step S504 The source RNC sends a relocation request to the source SGSN, where the relocation request carries the uplink sequence number and/or the downlink sequence number of the PDCP, and indicates that the downlink data stored in the source RNC needs to be forwarded.
- Step S506 The source SGSN sends the session context and the uplink sequence number and/or the downlink sequence number of the source PDCP to the target MME by forwarding the relocation request.
- Step S508 The target MME sends a handover request to the target eNodeB to establish a radio bearer, and sends the uplink sequence number and/or the downlink sequence number of the source PDCP to the target eNodeB.
- Step S512 The target MME sends a Forward Relocation Response message to the source SGSN. In this process, up to this step, the source SGSN is still transmitting uplink and downlink user plane data (if there is data to be transmitted).
- Step S514 The source SGSN completes the preparation work before the handover, and sends a handover command message to the source RNC.
- Step S516 The source RNC sends a handover command message to the UE, where the message includes relevant radio parameters and information that the target eNodeB has established in the preliminary preparation phase.
- Step S518 The source SGSN directly forwards the downlink data of the uncompleted transmission or the unacknowledged (acknowledgement mode) to the target eNodeB.
- Step S520 After receiving the handover command message sent by the source RNC, the UE completes the handover process of the UE from the UTRAN system to the EUTRAN system.
- the above switching method and data processing method can implement lossless handover of a terminal between a radio access technology of an Evolved Packet System (EPS) and a second generation (2G) and a third generation (3G) packet system, due to PDCP. /SNDCP sequence number reservation and logical forwarding, and forwarding of uplink and downlink data (retransmission), so that after the terminal switches to the new standard cell, the user data can still be sequentially transmitted based on the sequence number.
- EPS Evolved Packet System
- 2G second generation
- 3G third generation
- the data processing method can be widely applied to data services with high delay tolerance. For this service, if a PDCP SDU is discarded, the data transmission rate may drop sharply, which seriously affects the communication quality of the network. .
- FIG. 6 is a structural block diagram of a switching device according to an embodiment of the present invention. As shown in FIG. 6, the switching device includes: a first sending module 602, configured to be directed to a target base station.
- the handover request carries an uplink sequence number and/or a downlink sequence number of the packet data convergence protocol PDCP, and the source access station and the target base station adopt different radio access technologies;
- the second sending module 604 is connected to the A sending module 602 is configured to: after receiving the acknowledgement message of the target base station to the request, send data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station; and the switching module 606 is connected to the second sending module. 604.
- the first sending module 602 sends the uplink sequence number and/or the downlink sequence number of the PDCP to the target base station by using the handover request, where the source access station and the target base station adopt different radio access technologies, and receive the same.
- the second sending module 604 will perform the uplink sequence with the PDCP.
- the data corresponding to the column number and/or the downlink sequence number is sent to the target base station, and therefore, the target base station can be received according to the
- the uplink sequence number and/or the downlink sequence number of the PDCP receive the data sent by the source base station, ensuring that the target base station can correctly receive the data sent by the source base station, so that the handover module 606 completes the target base station in which the UE adopts different radio access technologies.
- Switching between the source and the base station solves the problem of data loss caused by different standards of different radio access technologies when switching between different radio access technologies, thereby ensuring that data is not lost during handover, and the network is improved. Communication quality.
- the terminal handover in the above embodiment is, for example, the mobility of the EUTRAN system to the UTRAN system, that is, the terminal switches from the EUTRAN system to the UTRAN system, as shown in FIG.
- the target 3G RNC and Base Transceiver Station (BTS) nodes are represented by a box, which is connected to the target GPRS Service Support Node (SGSN), which is standard-oriented universal mobile.
- SGSN GPRS Service Support Node
- Communication System Universal Mobile Telecommunications System, UMTS for short
- S-GW Serving-Gateway
- the NAS signaling of the control plane is based on the S3 interface.
- the source service MME Mobile Management Entity
- the old resources and connections on the radio interface based on S1 user data and signaling (indicated by dashed lines) Released, user data and control signaling will be transmitted based on the newly established UMTS Iu interface.
- the handover from the UTRAN system to the EUTRAN system is also based on the S3 interface to implement control plane signaling transfer, and then by creating a new eNodeB and MME.
- S1 interface between S-GWs to complete handover between different RATs.
- the PDCP uplink sequence number sent by the first sending module 602 can be: The sequence number of the first unsuccessfully transmitted or unacknowledged PDU of the PDCP/subnet related convergence protocol S DCP; the PDCP downlink sequence number sent by the first sending module 602 may be: In the determining mode, the PDCP/S DCP The next sequence number of the sequence number carried by the sequential service data unit SDU sent to the upper layer.
- the PDCP uplink sequence number is the sequence number of the first unsuccessfully transmitted or unacknowledged PDU, to ensure that the target base station can accurately receive the data sent by the terminal according to the PDCP uplink sequence number, and the PDCP downlink sequence number.
- the PDCP/SNDCP is sent to the next sequence number of the sequence number carried by the SDU of the upper layer to ensure that the target base station can accurately forward the data forwarded by the source base station to the target base station to the terminal according to the PDCP downlink sequence number, thereby improving the data.
- the accuracy of the delivery provides a data processing apparatus.
- FIG. 7 is a structural block diagram of a data processing apparatus according to an embodiment of the present invention. As shown in FIG.
- the data processing apparatus includes: a first receiving module 702, configured to receive a source base station.
- the handover request is sent, where the handover request carries the uplink sequence number and/or the downlink sequence number of the packet data convergence protocol PDCP, and the source access station and the target base station adopt different radio access technologies;
- the second receiving module 704 is connected to
- the first receiving module 702 is configured to receive data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station
- the third sending module 706 is connected to the second receiving module 704, and configured to use the target base station.
- the uplink sequence number and/or the downlink sequence number of the PDCP matched by the radio access technology are sent to the UE by the data received by the second receiving module 704.
- the first receiving module 702 receives the uplink sequence number and/or the downlink sequence number of the PDCP sent by the target base station by using the handover request, where the source access station and the target base station adopt different radio access technologies, and receive the same.
- the second receiving module 704 receives the data corresponding to the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station, and therefore, the target base station can be based on the received uplink sequence number of the PDCP and/or Or the downlink sequence number receives the data sent by the source base station, ensures that the target base station can correctly receive the data sent by the source base station, and the third sending module 706 selects the uplink sequence number of the PDCP according to the radio access technology of the target base station and/or The downlink sequence number sends data to the terminal, thereby completing handover between the target base station and the source base station using different radio access technologies, and solving the problem of different radio access technologies when switching between different radio access technologies The problem of data loss caused by different standards, thus ensuring no data loss during handover, improve The communication quality of the network.
- the data processing apparatus further includes: a processing module 708, connected to the second receiving module 704, configured to set the uplink sequence number and/or PDCP of the PDCP in one of the following manners.
- the downlink sequence number is converted into a sequence number that matches the radio access technology of the target base station: when the radio access technology of the source base station is Long Term Evolution (LTE), when the radio access technology of the target base station is the global mobile communication system GSM, Determining that the lower 10 position of the 12-bit serial number of the data bearer in the source base station determining mode is a sequence number that matches the radio access technology of the target base station; if the radio access technology of the source base station is LTE, the radio access technology of the target base station is Time division synchronous code division multiple access (TD-CDMA), determining that the 12-bit serial number of the data bearer in the source base station determining mode is logically ANDed with 0xfi)0, and the obtained 16-bit number is used as the radio access technology with the target base station.
- LTE Long Term Evolution
- GSM global mobile communication system
- the radio access technology of the source base station is GSM, and the radio access technology of the target base station is LTE, determining the data bearer of the source base station determining mode
- the 10-bit serial number is logically ANDed with 0x300, and the obtained 12-bit number is used as the serial number matching the radio access technology of the target base station; if the radio access technology of the source base station is TD-CDMA, the radio access technology of the target base station For LTE, the lower 12-bit number of the 16-bit serial number of the data bearer in the source base station determining mode is determined as the sequence number that matches the radio access technology of the target base station.
- the uplink sequence number and/or the downlink sequence number of the PDCP sent by the source base station are converted into a sequence number that matches the radio access technology of the target base station, and the target base station is configured to send data to the terminal UE.
- the method for converting the uplink sequence number and/or the downlink sequence number of the PDCP in multiple scenarios is provided, which can meet the application requirements of different scenarios, thereby enhancing the applicability of the embodiment.
- the PDCP uplink sequence number can be: In the acknowledge mode, the PDCP/subnet related convergence The sequence number of the first unsuccessfully transmitted or unacknowledged PDU of the protocol S DCP; the PDCP downlink sequence number may be: In the determining mode, the PDCP/S DCP is sent to the upper sequence of the sequential service data unit SDU carrying the serial number A serial number.
- the PDCP uplink sequence number is the sequence number of the first unsuccessfully transmitted or unacknowledged PDU to ensure that the target base station can accurately receive the data sent by the terminal according to the PDCP uplink sequence number, and the PDCP downlink sequence number.
- the PDCP/SNDCP is sent to the next sequence number of the sequence number carried by the SDU of the upper layer to ensure that the target base station can accurately forward the data forwarded by the source base station to the target base station to the terminal according to the PDCP downlink sequence number, thereby improving the data. The accuracy of the delivery.
- modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
- the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
- the invention is not limited to any specific combination of hardware and software.
- the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.
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Abstract
本发明提供了一种切换方法及装置、数据处理方法及装置,其中,该切换方法包括:源基站向目标基站发送切换请求,其中,切换请求中携带有PDCP的上行序列号和/或下行序列号,源基站和目标基站采用的无线接入技术不相同;源基站接收到目标基站对请求的确认消息后,将与PDCP的上行序列号和/或下行序列号对应的数据发送给目标基站;源基站将UE切换到目标基站。本发明解决了在不同无线接入技术间进行切换时,由于不同无线接入技术的标准不同而导致的数据丢失的问题,从而确保了在切换时不丢失数据,提高了网络的通信质量。
Description
切换方法及装置、 数据处理方法及装置 技术领域 本发明涉及通信领域, 具体而言, 涉及一种切换方法及装置、 数据处理方法及装 置。 背景技术 目前, 演进的 UMTS 陆地无线接入网 (Evolved UMTS Territorial Radio Access Network, 简称为 EUTRAN) 为了提供给用户一种无中断的移动性用户体验, 需要实 现的一个关键特征是无缝地切换, 长期演进 (Long Term Evolution, 简称为 LTE) 系 统对这种功能的支持不仅覆盖相同频率的 LTE小区,而且扩展到使用不同频率的小区, 以及众多其他无线接入技术的小区, 然而, 在演进接入网 EUTRAN和 2G/3G网络之 间的不同无线接入技术间进行切换时, 由于不同无线接入技术的标准不同, 例如, 不 同无线接入技术(Radio Access Technology, 简称为 RAT)中使用的分组数据汇聚协议 层 (Packet Data Convergence Protocol, 简称为 PDCP) 序列号的位数不同, 在切换时, 源接入网络和目标接入网络的 PDCP序列号的位数不同, 目标接入网络无法获得源接 入网络的 PDCP序列号, 因此, 目标接入网络无法正确地接收源接入网络切换后转发 的数据, 从而导致在不同无线接入技术间进行切换时数据发生丢失, 降低了网络的通 信质量。 发明内容 本发明提供了一种切换方法及装置、 数据处理方法及装置, 以至少解决相关技术 中的在不同无线接入技术间进行切换时, 由于不同无线接入技术的标准不同而导致的 数据丢失的问题。 根据本发明的一个方面, 提供了一种切换方法, 其包括: 源基站向目标基站发送 切换请求, 其中, 切换请求中携带有 PDCP的上行序列号和 /或下行序列号, 源基站和 目标基站采用的无线接入技术不相同; 源基站接收到目标基站对请求的确认消息后, 将与 PDCP的上行序列号和 /或下行序列号对应的数据发送给目标基站; 源基站将 UE (User Equipment, 用户设备) 切换到目标基站。 优选地, PDCP上行序列号为: 确认模式 (Acknowledge Mode, 简称为 AM) 下, PDCP/子网会聚收敛协议 ( SubNetwork Dependent Convergence Protocol , 简称为
S DCP) 的第一个未成功传输或未确认的 PDU (Protocol Data Unit, 协议数据单元) 的序列号; PDCP下行序列号为: 确定模式下, PDCP/S DCP发送给上层的顺序服务 数据单元 (Service Data Unit, 简称为 SDU) 所携带序列号的下一个序列号。 根据本发明的另一方面, 提供了一种数据处理方法, 其包括: 目标基站接收源基 站发送的切换请求, 其中, 切换请求中携带有分组数据汇聚协议 PDCP的上行序列号 和 /或下行序列号, 源基站和目标基站采用的无线接入技术不相同; 目标基站接收源基 站发送的与 PDCP的上行序列号和 /或下行序列号对应的数据; 目标基站使用与该目标 基站的无线接入技术匹配的 PDCP的上行序列号和 /或下行序列号,将数据发送给 UE。 优选地, 在目标基站使用与该目标基站的无线接入技术匹配的 PDCP的上行序列 号和 /或下行序列号, 将数据发送给 UE之前, 上述数据处理方法还包括: 目标基站通 过以下方式之一将 PDCP的上行序列号和 /或下行序列号转换为与该目标基站的无线接 入技术匹配的序列号: 源基站的无线接入技术为长期演进(LTE), 目标基站的无线接 入技术为全球移动通信(Global system for Mobile Communication,简称为 GSM)***, 确定源基站确定模式下数据承载的 12位序列号的低 10位置为匹配的序列号; 如果源 基站的无线接入技术为 LTE, 目标基站的无线接入技术为时分同步码分多址接入 (TD-CDMA),确定源基站确定模式下数据承载的 12位序列号与 0xfi)0进行逻辑与运 算, 得到的 16位数字作为匹配的序列号; 如果源基站的无线接入技术为 GSM, 目标 基站的无线接入技术为 LTE, 确定源基站确定模式下数据承载的 10位序列号与 0x300 进行逻辑与运算,得到的 12位数字作为匹配的序列号; 如果源基站的无线接入技术为 TD-CDMA, 目标基站的无线接入技术为 LTE, 确定源基站确定模式下数据承载的 16 位序列号的低 12位数字作为匹配的序列号。 优选地, PDCP上行序列号为: 确认模式下, PDCP/子网相关会聚协议 S DCP的 第一个未成功传输或未确认的协议数据单元 (Protocol Data Unit, 简称为 PDU) 的序 列号; PDCP下行序列号为: 确定模式下, PDCP/SNDCP发送给上层的顺序 SDU所携 带序列号的下一个序列号。 根据本发明的又一方面, 提供了一种切换装置, 其包括: 第一发送模块, 设置为 向目标基站发送切换请求, 其中, 切换请求中携带有分组数据汇聚协议 PDCP的上行 序列号和 /或下行序列号, 源基站和目标基站采用的无线接入技术不相同; 第二发送模 块, 设置为在接收到目标基站对请求的确认消息后, 将与 PDCP的上行序列号和 /或下 行序列号对应的数据发送给目标基站; 切换模块, 设置为将 UE切换到目标基站。
优选地, PDCP上行序列号为: 确认模式下, PDCP/子网相关会聚协议 (S DCP) 的第一个未成功传输或未确认的协议数据单元 PDU的序列号; PDCP下行序列号为: 确定模式下, PDCP/S DCP发送给上层的顺序服务数据单元 SDU所携带序列号的下 一个序列号。 根据本发明的又一方面, 提供了一种数据处理装置, 其包括: 第一接收模块, 设 置为接收源基站发送的切换请求, 其中, 切换请求中携带有分组数据汇聚协议 PDCP 的上行序列号和 /或下行序列号, 源基站和目标基站采用的无线接入技术不相同; 第二 接收模块, 设置为接收源基站发送的与 PDCP的上行序列号和 /或下行序列号对应的数 据; 第三发送模块, 设置为使用与该目标基站的无线接入技术匹配的 PDCP的上行序 列号和 /或下行序列号, 将数据发送给 UE。 优选地,上述数据处理装置还包括: 处理模块,设置为通过以下方式之一将 PDCP 的上行序列号和 /或下行序列号转换为与该目标基站的无线接入技术匹配的序列号: 源 基站的无线接入技术为长期演进 LTE, 目标基站的无线接入技术为全球移动通信*** (GSM), 确定源基站确定模式下数据承载的 12位序列号的低 10位置为匹配的序列 号; 如果源基站的无线接入技术为 LTE, 目标基站的无线接入技术为时分同步码分多 址接入(TD-CDMA),确定源基站确定模式下数据承载的 12位序列号与 0xfi)0组成的 16位数字作为匹配的序列号; 如果源基站的无线接入技术为 GSM, 目标基站的无线 接入技术为 LTE, 确定源基站确定模式下数据承载的 10位序列号与 0x300组成的 12 位数字作为匹配的序列号; 如果源基站的无线接入技术为 TD-CDMA, 目标基站的无 线接入技术为 LTE, 确定源基站确定模式下数据承载的 16位序列号的低 12位数字作 为匹配的序列号。 优选地, PDCP上行序列号为: 确认模式下, PDCP/子网相关会聚协议 (S DCP) 的第一个未成功传输或未确认的协议数据单元 PDU的序列号; PDCP下行序列号为: 确定模式下, PDCP/SNDCP发送给上层的顺序服务数据单元 SDU所携带序列号的下 一个序列号。 在本发明中,源基站通过切换请求将 PDCP的上行序列号和 /或下行序列号发送给 目标基站, 其中, 源基站和目标基站采用的无线接入技术不相同, 在收到目标基站发 送的请求的确认消息后,将与上述 PDCP的上行序列号和 /或下行序列号对应的数据发 送给目标基站, 因此, 目标基站可以根据接收到的 PDCP的上行序列号和 /或下行序列 号接收源基站发送的数据, 确保了目标基站可以正确地接收源基站发送的数据, 从而 完成了 UE在采用不相同无线接入技术的目标基站和源基站之间切换, 解决了在不同
无线接入技术间进行切换时, 由于不同无线接入技术的标准不同而导致的数据丢失的 问题, 从而确保了在切换时不丢失数据, 提高了网络的通信质量。 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, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例的切换方法的流程图; 图 2是根据本发明实施例的 EUTRAN***到 UTRAN***的移动性的说明示意 图; 图 3是根据本发明实施例的数据处理方法的流程图; 图 4是根据本发明实施例的由 EUTRAN***切换到 UTRAN***的切换方法的流 程图; 图 5是根据本发明实施例的由 UTRAN***切换到 EUTRAN***的切换方法的流 程图; 图 6是根据本发明实施例的切换装置的结构框图; 图 7是根据本发明实施例的数据处理装置的结构框图; 以及 图 8是根据本发明实施例的另一种数据处理装置的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在不冲突的 情况下, 本申请中的实施例及实施例中的特征可以相互组合。 本实施例提供了一种切换方法, 图 1是根据本发明实施例的切换方法的流程图, 如图 1所示, 该切换方法包括步骤 S102至步骤 S106。 步骤 S102: 源基站向目标基站发送切换请求, 其中, 切换请求中携带有分组数据 汇聚协议 PDCP的上行序列号和 /或下行序列号,源基站和目标基站采用的无线接入技 术不相同。
步骤 S104: 源基站接收到目标基站对请求的确认消息后, 将与 PDCP的上行序列 号和 /或下行序列号对应的数据发送给目标基站。 步骤 S106: 源基站将 UE切换到目标基站。 通过上述步骤,源基站通过切换请求将 PDCP的上行序列号和 /或下行序列号发送 给目标基站, 其中, 源基站和目标基站采用的无线接入技术不相同, 在收到目标基站 发送的请求的确认消息后,将与该 PDCP的上行序列号和 /或下行序列号对应的数据发 送给目标基站, 因此, 目标基站可以根据接收到的 PDCP的上行序列号和 /或下行序列 号接收源基站发送的数据, 确保了目标基站可以正确地接收源基站发送的数据, 从而 完成了 UE在采用不相同无线接入技术的目标基站和源基站之间切换, 解决了在不同 无线接入技术间进行切换时, 由于不同无线接入技术的标准不同而导致的数据丢失的 问题, 从而确保了在切换时不丢失数据, 提高了网络的通信质量。 上述实施例中的终端切换,是不同***之间的移动性切换,例如 EUTRAN***切 换到 UTRAN***, 也就是说, 终端从 EUTRAN***切换到 UTRAN***, 如图 2所 示, EUTRAN***与 2G/3G的 UTRAN***间的移动性, 目标 3G RNC和 BTS (Base Transceiver Station, 简称为基站收发信机) 节点以一个方框表示, 其与目标 SGSN ( Serving GPRS Support Node, 简称为服务 GPRS支持节点) 相连, 面向标准的通用 移动通信*** (Universal Mobile Telecommunications System, 简称为 UMTS) Iu接口, 服务网关 (Serving-Gateway, 简称为 S-GW) 作为数据面数据承载的本地移动性管理 实体, 控制面的 NAS信令基于 S3接口从源服务移动性管理实体(Mobile Management Entity, 简称为 MME)移动到目标 SGSN; 而对于用户面, 新的数据通道基于 S4接口 建立在 S-GW和目标 SGSN之间, 以确保分组传输的连续性, 一旦切换完成后, 基于 S1的用户数据与信令的无线接口上的旧资源和连接(虚线表示)将被释放, 用户数据 和控制信令将基于新建的 UMTS Iu接口传输, 当然, 从 UTRAN***到 EUTRAN系 统间的切换,也是首先基于 S3接口实现控制面信令的转移,然后通过新建演进的节点 B (evolved Node B) 与 MME以及 S-GW间的 SI接口, 以完成不同 RAT间的切换。 上述切换过程在面向 2G/GPRS***的移动性中也可以适用, 因为 SGSN同时存在于 2G和 3G的分组核心架构中。 为了确保目标基站可以根据 PDCP的上行序列号和 /或下行序列号准确地接收源基 站发送的数据, 在本优选实施例中, PDCP 上行序列号可以为: 在确认模式下, PDCP/S DCP的第一个未成功传输或未确认的 PDU的序列号; PDCP下行序列号可以 为: 在确定模式下, PDCP/SNDCP发送给上层的顺序服务数据单元 SDU所携带序列 号的下一个序列号。 在本优选实施例中, PDCP 上行序列号为第一个未成功传输或未
确认的 PDU的序列号,以确保目标基站可以根据该 PDCP上行序列号准确地接收终端 发送的数据, PDCP下行序列号为 PDCP/S DCP发送给上层的 SDU所携带序列号的 下一个序列号, 以确保目标基站可以根据该 PDCP下行序列号准确地将源基站转发给 目标基站的数据再次转发给终端, 从而提高了数据发送的准确性。 本实施例提供了一种数据处理方法, 如图 3所示, 该数据处理方法包括步骤 S302 至步骤 S306。 步骤 S302: 目标基站接收源基站发送的切换请求, 其中, 切换请求中携带有分组 数据汇聚协议 PDCP的上行序列号和 /或下行序列号,源基站和目标基站采用的无线接 入技术不相同。 步骤 S304:目标基站接收源基站发送的与 PDCP的上行序列号和 /或下行序列号对 应的数据。 步骤 S306: 目标基站使用与该目标基站的无线接入技术匹配的 PDCP的上行序列 号和 /或下行序列号, 将数据发送给 UE。 通过上述步骤, 目标基站通过切换请求接收目标基站发送的 PDCP的上行序列号 和 /或下行序列号, 其中, 源基站和目标基站采用的无线接入技术不相同, 在收到源基 站发送的请求后, 目标基站接收源基站发送的与上述 PDCP的上行序列号和 /或下行序 列号对应的数据, 因此, 目标基站可以根据接收到的 PDCP的上行序列号和 /或下行序 列号接收源基站发送的数据, 确保了目标基站可以正确地接收源基站发送的数据, 并 根据与该目标基站的无线接入技术匹配的 PDCP的上行序列号和 /或下行序列号将数据 发送给终端, 从而完成了 UE在采用不相同无线接入技术的目标基站和源基站之间切 换, 解决了在不同无线接入技术间进行切换时, 由于不同无线接入技术的标准不同而 导致的数据丢失的问题, 从而确保了在切换时不丢失数据, 提高了网络的通信质量。 为了准确地将数据发送给终端, 目标基站在将数据发送给 UE之前, 将接收的源 基站发送的 PDCP的上行序列号和 /或下行序列号转换为与该目标基站的无线接入技术 匹配的序列号, 在本优选实施例中, 提供了优选的转换方法, 例如, 在源基站的无线 接入技术为长期演进(LTE)时, 目标基站的无线接入技术为全球移动通信***(GSM) 时, 确定源基站确定模式下数据承载的 12位序列号的低 10位置为与目标基站的无线 接入技术匹配的序列号; 如果源基站的无线接入技术为 LTE, 目标基站的无线接入技 术为时分同步码分多址接入 (TD-CDMA), 确定源基站确定模式下数据承载的 12位 序列号与 Oxfi)0进行逻辑与运算,得到的 16位数字作为与目标基站的无线接入技术匹 配的序列号; 如果源基站的无线接入技术为 GSM, 目标基站的无线接入技术为 LTE,
确定源基站确定模式下数据承载的 10位序列号与 0x300进行逻辑与运算, 得到的 12 位数字作为与目标基站的无线接入技术匹配的序列号; 如果源基站的无线接入技术为 TD-CDMA, 目标基站的无线接入技术为 LTE, 确定源基站确定模式下数据承载的 16 位序列号的低 12位数字作为与目标基站的无线接入技术匹配的序列号。在本优选实施 例中,将源基站发送的 PDCP的上行序列号和 /或下行序列号转换为与该目标基站的无 线接入技术匹配的序列号, 保证了目标基站将数据发送给终端 UE的准确性, 同时, 提供了多种场景下的 PDCP的上行序列号和 /或下行序列号转换的方法,可以满足不同 场景的应用需求, 从而增强了本实施例的适用性。 为了确保目标基站可以根据 PDCP的上行序列号和 /或下行序列号准确地将数据发 送给终端, 在本优选实施例中, PDCP上行序列号可以为: 在确认模式下, PDCP/子网 相关会聚协议 S DCP的第一个未成功传输或未确认的 PDU的序列号; PDCP下行序 列号可以为: 在确定模式下, PDCP/S DCP发送给上层的顺序服务数据单元 SDU所 携带序列号的下一个序列号。 在本优选实施例中, PDCP 上行序列号为第一个未成功 传输或未确认的 PDU的序列号,以确保目标基站可以根据该 PDCP上行序列号准确地 接收终端发送的数据, PDCP下行序列号为 PDCP/SNDCP发送给上层的 SDU所携带 序列号的下一个序列号, 以确保目标基站可以根据该 PDCP下行序列号准确地将源基 站转发给目标基站的数据再次转发给终端, 从而提高了数据发送的准确性。 以下结合附图和实例对上述各优选实施例进行详细地描述。 实例一 在本实例中以由 EUTRAN***切换到 UTRAN***的切换方法为例,如图 4所示, 该切换方法包括步骤 S402至步骤 S420。 步骤 S402: 源 eNodeB根据实时信息作出切换决策, 准备不同 RAT间的切换。 步骤 S404: 源 eNodeB向源 MME发出切换请求(Handover Required), 该切换请 求中携带有 PDCP的上行序列号和 /或下行序列号, 并指示需要转发存储在源 eNodeB 内的下行数据。 步骤 S406: 源 MME通过转发重定位请求 (Forward Relocation Request) 将会话 上下文及源 PDCP的上行序列号和 /或下行序列号发送到目标 SGSN。
步骤 S408: 目标 SGSN向目标 RNC发送重定位请求 (Relocation Request), 以请 求分配无线网络资源, 并将源 PDCP 的上行序列号和 /或下行序列号发送到目标 RNC ( Radio Network Controller, 无线网络控制器)。 步骤 S410: 目标 RNC完成无线资源分配之后, 向目标 SGSN返回重定位请求确 认 (Relocation Request Acknowledge) 消息, 并准备接收 S-GW或目标 SGSN发送的 下行 PDUs。 步骤 S412: 目标 SGSN 向源 MME 发送转发重定位响应 (Forward Relocation Response) 消息, 在该流程中, 到此步骤为止, 源 eNodeB 仍在传输上下行用户面数 据 (如果有数据需要传输)。 步骤 S414: 源 MME完成切换前的准备工作, 向源 eNodeB 发送切换命令消息
( Handover Command )。 步骤 S416: 源 eNodeB向 UE发送切换命令消息, 该消息包含了在前期准备阶段 中目标 RNC已建好的相关无线参数和信息。 步骤 S418: 源 eNodeB将未完成发送或未确认 (确认模式) 的下行数据直接转发 给目标 SGSN。 步骤 S420: UE接收到 eNodeB发来的切换命令消息后, 完成 UE由 EUTRAN系 统到 UTRAN***的切换过程。 实例二 在本实例中以由 UTRAN***切换到 EUTRAN***的切换方法为例,如图 5所示, 该切换方法包括步骤 S502至步骤 S520。 步骤 S502: 源 RNC根据实时信息作出切换决策, 准备不同 RAT间的切换。 步骤 S504: 源 RNC向源 SGSN发出重定位请求, 该重定位请求中携带有 PDCP 的上行序列号和 /或下行序列号, 并指示需要转发存储在源 RNC内的下行数据。 步骤 S506:源 SGSN通过转发重定位请求将会话上下文及源 PDCP的上行序列号 和 /或下行序列号发送到目标 MME。 步骤 S508: 目标 MME向目标 eNodeB发送切换请求, 用以建立无线承载, 并将 源 PDCP的上行序列号和 /或下行序列号发送到目标 eNodeB。
步骤 S510: 目标 eNodeB完成无线承载建立之后, 向目标 MME发送切换确认消 息, 并准备接收 S-GW或目标 MME发送的下行 PDUs。 步骤 S512: 目标 MME向源 SGSN发送转发重定位响应消息。 在该流程中, 到此 步骤为止, 源 SGSN仍在传输上下行用户面数据 (如果有数据需要传输)。 步骤 S514: 源 SGSN完成切换前的准备工作, 向源 RNC发送切换命令消息。 步骤 S516: 源 RNC向 UE发送切换命令消息, 该消息包含了在前期准备阶段中 目标 eNodeB已建好的相关无线参数和信息。 步骤 S518: 源 SGSN将未完成发送或未确认(确认模式) 的下行数据直接转发给 目标 eNodeB。 步骤 S520: UE接收到源 RNC发来的切换命令消息后, 完成 UE由 UTRAN*** 到 EUTRAN***的切换过程。 上述切换方法和数据处理方法可以实现演进分组***(Evolved Packet System, 简 称为 EPS) 与第二代 (2G)和第三代(3G)分组***的无线接入技术间终端的无损切 换, 由于 PDCP/SNDCP序列号的保留和逻辑转发, 以及上下行数据的转发 (重发), 使得终端在切换到新制式的小区后,用户数据仍然可以基于序列号来确保被顺序传输, 当然, 上述换方法和数据处理方法可以广泛应用在时延容忍度高的数据业务上, 因为, 对于这种业务来说,如果有一个 PDCP SDU的丢弃就可能导致数据传输率的急剧下降, 严重影响网络的通信质量。 实施例 2 本实施例提供了一种切换装置,图 6是根据本发明实施例的切换装置的结构框图, 如图 6所示, 该切换装置包括: 第一发送模块 602, 设置为向目标基站发送切换请求, 其中, 切换请求中携带有分组数据汇聚协议 PDCP的上行序列号和 /或下行序列号, 源 基站和目标基站采用的无线接入技术不相同; 第二发送模块 604, 连接至第一发送模 块 602, 设置为在接收到目标基站对请求的确认消息后, 将与 PDCP的上行序列号和 / 或下行序列号对应的数据发送给目标基站; 切换模块 606, 连接至第二发送模块 604, 设置为将 UE切换到目标基站。 在上述实施例中,第一发送模块 602通过切换请求将 PDCP的上行序列号和 /或下 行序列号发送给目标基站, 其中, 源基站和目标基站采用的无线接入技术不相同, 在 收到目标基站发送的请求的确认消息后, 第二发送模块 604将与上述 PDCP的上行序
列号和 /或下行序列号对应的数据发送给目标基站, 因此, 目标基站可以根据接收到的
PDCP的上行序列号和 /或下行序列号接收源基站发送的数据, 确保了目标基站可以正 确地接收源基站发送的数据, 从而切换模块 606完成了 UE在采用不相同无线接入技 术的目标基站和源基站之间切换, 解决了在不同无线接入技术间进行切换时, 由于不 同无线接入技术的标准不同而导致的数据丢失的问题, 从而确保了在切换时不丢失数 据, 提高了网络的通信质量。 上述实施例中的终端切换,例如是 EUTRAN***到 UTRAN***的移动性, 也就 是说,终端从 EUTRAN***切换到 UTRAN***,如图 2所示, EUTRAN***与 2G/3G 的 UTRAN***间的移动性, 目标 3G RNC和基站收发信机(Base Transceiver Station, 简称为 BTS) 节点以一个方框表示, 其与目标 GPRS 服务支持节点 (Serving GPRS Support Node, 简称为 SGSN)相连, 面向标准的通用移动通信***(Universal Mobile Telecommunications System, 简称为 UMTS) Iu接口, 服务网关 (Serving-Gateway, 简称为 S-GW)作为数据面数据承载的本地移动性管理实体, 控制面的 NAS信令基于 S3 接口从源服务 MME (Mobile Management Entity, 移动性管理实体) 移动到目标 SGSN; 而对于用户面, 新的数据通道基于 S4接口建立在 S-GW和目标 SGSN之间, 以确保分组传输的连续性,一旦切换完成后,基于 S1的用户数据与信令的无线接口上 的旧资源和连接 (虚线表示) 将被释放, 用户数据和控制信令将基于新建的 UMTS Iu 接口传输, 当然, 从 UTRAN***到 EUTRAN***间的切换, 也是首先基于 S3接口 实现控制面信令的转移, 然后通过新建 eNodeB与 MME以及 S-GW间的 S1接口, 以 完成不同 RAT间的切换。上述切换过程在面向 2G/GPRS***的移动性中也可以适用, 因为 SGSN同时存在于 2G和 3G的分组核心架构中。 为了确保目标基站可以根据 PDCP的上行序列号和 /或下行序列号准确地接收源基 站发送的数据, 在本优选实施例中, 第一发送模块 602发送的 PDCP上行序列号可以 为: 在确认模式下, PDCP/子网相关会聚协议 S DCP的第一个未成功传输或未确认的 PDU的序列号; 第一发送模块 602发送的 PDCP下行序列号可以为: 在确定模式下, PDCP/S DCP发送给上层的顺序服务数据单元 SDU所携带序列号的下一个序列号。 在本优选实施例中, PDCP上行序列号为第一个未成功传输或未确认的 PDU的序列号, 以确保目标基站可以根据该 PDCP上行序列号准确地接收终端发送的数据, PDCP下 行序列号为 PDCP/SNDCP发送给上层的 SDU所携带序列号的下一个序列号, 以确保 目标基站可以根据该 PDCP下行序列号准确地将源基站转发给目标基站的数据再次转 发给终端, 从而提高了数据发送的准确性。
本实施例提供了一种数据处理装置, 图 7是根据本发明实施例的数据处理装置的 结构框图, 如图 7所示, 该数据处理装置包括: 第一接收模块 702, 设置为接收源基 站发送的切换请求, 其中, 切换请求中携带有分组数据汇聚协议 PDCP的上行序列号 和 /或下行序列号,源基站和目标基站采用的无线接入技术不相同;第二接收模块 704, 连接至第一接收模块 702, 设置为接收源基站发送的与 PDCP的上行序列号和 /或下行 序列号对应的数据; 第三发送模块 706, 连接至第二接收模块 704, 设置为使用与该目 标基站的无线接入技术匹配的 PDCP的上行序列号和 /或下行序列号,将第二接收模块 704接收到的数据发送给 UE。 在上述实施例中, 第一接收模块 702通过切换请求接收目标基站发送的 PDCP的 上行序列号和 /或下行序列号, 其中, 源基站和目标基站采用的无线接入技术不相同, 在收到源基站发送的请求后, 第二接收模块 704接收源基站发送的与上述 PDCP的上 行序列号和 /或下行序列号对应的数据, 因此, 目标基站可以根据接收到的 PDCP的上 行序列号和 /或下行序列号接收源基站发送的数据,确保了目标基站可以正确地接收源 基站发送的数据, 第三发送模块 706根据与该目标基站的无线接入技术匹配的 PDCP 的上行序列号和 /或下行序列号将数据发送给终端, 从而完成了 UE在采用不相同无线 接入技术的目标基站和源基站之间切换, 解决了在不同无线接入技术间进行切换时, 由于不同无线接入技术的标准不同而导致的数据丢失的问题, 从而确保了在切换时不 丢失数据, 提高了网络的通信质量。 为了准确地将数据发送给终端, 如图 8所示, 上述数据处理装置还包括: 处理模 块 708,连接至第二接收模块 704, 设置为通过以下方式之一将 PDCP的上行序列号和 /或下行序列号转换为与该目标基站的无线接入技术匹配的序列号: 在源基站的无线接 入技术为长期演进(LTE)时, 目标基站的无线接入技术为全球移动通信*** GSM时, 确定源基站确定模式下数据承载的 12位序列号的低 10位置为与目标基站的无线接入 技术匹配的序列号; 如果源基站的无线接入技术为 LTE, 目标基站的无线接入技术为 时分同步码分多址接入 (TD-CDMA), 确定源基站确定模式下数据承载的 12位序列 号与 0xfi)0进行逻辑与运算,得到的 16位数字作为与目标基站的无线接入技术匹配的 序列号; 如果源基站的无线接入技术为 GSM, 目标基站的无线接入技术为 LTE, 确定 源基站确定模式下数据承载的 10位序列号与 0x300进行逻辑与运算, 得到的 12位数 字作为与目标基站的无线接入技术匹配的序列号; 如果源基站的无线接入技术为 TD-CDMA, 目标基站的无线接入技术为 LTE, 确定源基站确定模式下数据承载的 16 位序列号的低 12位数字作为与目标基站的无线接入技术匹配的序列号。在本优选实施 例中,将源基站发送的 PDCP的上行序列号和 /或下行序列号转换为与该目标基站的无 线接入技术匹配的序列号, 保证了目标基站将数据发送给终端 UE的准确性, 同时,
提供了多种场景下的 PDCP的上行序列号和 /或下行序列号转换的方法,可以满足不同 场景的应用需求, 从而增强了本实施例的适用性。 为了确保目标基站可以根据 PDCP的上行序列号和 /或下行序列号准确地将数据发 送给终端, 在本优选实施例中, PDCP上行序列号可以为: 在确认模式下, PDCP/子网 相关会聚协议 S DCP的第一个未成功传输或未确认的 PDU的序列号; PDCP下行序 列号可以为: 在确定模式下, PDCP/S DCP发送给上层的顺序服务数据单元 SDU所 携带序列号的下一个序列号。 在本优选实施例中, PDCP 上行序列号为第一个未成功 传输或未确认的 PDU的序列号,以确保目标基站可以根据该 PDCP上行序列号准确地 接收终端发送的数据, PDCP下行序列号为 PDCP/SNDCP发送给上层的 SDU所携带 序列号的下一个序列号, 以确保目标基站可以根据该 PDCP下行序列号准确地将源基 站转发给目标基站的数据再次转发给终端, 从而提高了数据发送的准确性。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 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
1. 一种切换方法, 包括:
源基站向目标基站发送切换请求, 其中, 所述切换请求中携带有分组数据 汇聚协议 PDCP的上行序列号和 /或下行序列号,所述源基站和所述目标基站采 用的无线接入技术不相同;
所述源基站接收到目标基站对所述请求的确认消息后, 将与所述 PDCP的 上行序列号和 /或所述下行序列号对应的数据发送给所述目标基站;
所述源基站将 UE切换到所述目标基站。
2. 根据权利要求 1所述的方法, 其中, 所述 PDCP上行序列号为: 确认模式下, 所述 PDCP/子网相关会聚协议 S DCP的第一个未成功传输或未确认的协议数 据单元 PDU 的序列号; 所述 PDCP 下行序列号为: 所述确定模式下, 所述 PDCP/S DCP发送给上层的顺序服务数据单元 SDU所携带序列号的下一个序 列号。
3. 一种数据处理方法, 包括:
所述目标基站接收源基站发送的切换请求, 其中, 所述切换请求中携带有 分组数据汇聚协议 PDCP的上行序列号和 /或下行序列号,所述源基站和所述目 标基站采用的无线接入技术不相同;
所述目标基站接收所述源基站发送的与所述 PDCP 的上行序列号和 /或所 述下行序列号对应的数据; 所述目标基站使用与该目标基站的无线接入技术匹配的所述 PDCP的上行 序列号和 /或下行序列号, 将所述数据发送给所述 UE。
4. 根据权利要求 3所述的方法, 其中, 在所述目标基站使用与该目标基站的无线 接入技术匹配的所述 PDCP的上行序列号和 /或下行序列号,将所述数据发送给 所述 UE之前, 还包括:
所述目标基站通过以下方式之一将所述 PDCP 的上行序列号和 /或下行序 列号转换为所述与该目标基站的无线接入技术匹配的序列号:
所述源基站的无线接入技术为长期演进 LTE, 所述目标基站的无线接入技 术为全球移动通信*** GSM, 确定所述源基站确定模式下数据承载的 12位序 列号的低 10位置为所述匹配的序列号;
如果所述源基站的无线接入技术为所述 LTE, 所述目标基站的无线接入技 术为时分同步码分多址接入 TD-CDMA, 确定所述源基站确定模式下数据承载 的 12位序列号与 0xfi)0进行逻辑与运算, 得到的 16位数字作为所述匹配的序 列号;
如果源基站的无线接入技术为所述 GSM,所述目标基站的无线接入技术为 所述 LTE,确定所述源基站确定模式下数据承载的 10位序列号与 0x300进行逻 辑与运算, 得到的 12位数字作为所述匹配的序列号;
如果所述源基站的无线接入技术为所述 TD-CDMA, 所述目标基站的无线 接入技术为所述 LTE,确定所述源基站确定模式下数据承载的 16位序列号的低 12位数字作为所述匹配的序列号。
5. 根据权利要求 3或 4所述的方法, 其中, 所述 PDCP上行序列号为: 确认模式 下, 所述 PDCP/子网相关会聚协议 S DCP的第一个未成功传输或未确认的协 议数据单元 PDU的序列号; 所述 PDCP下行序列号为: 所述确定模式下, 所述 PDCP/S DCP发送给上层的顺序服务数据单元 SDU所携带序列号的下一个序 列号。
6. 一种切换装置, 应用于基站, 包括:
第一发送模块, 设置为向目标基站发送切换请求, 其中, 所述切换请求中 携带有分组数据汇聚协议 PDCP的上行序列号和 /或下行序列号,所述源基站和 所述目标基站采用的无线接入技术不相同;
第二发送模块, 设置为在接收到目标基站对所述请求的确认消息后, 将与 所述 PDCP 的上行序列号和 /或所述下行序列号对应的数据发送给所述目标基 站;
切换模块, 设置为将所述 UE切换到所述目标基站。
7. 根据权利要求 6所述的装置, 其中, 所述 PDCP上行序列号为: 确认模式下, 所述 PDCP/子网相关会聚协议 S DCP的第一个未成功传输或未确认的协议数 据单元 PDU 的序列号; 所述 PDCP 下行序列号为: 所述确定模式下, 所述 PDCP/SNDCP发送给上层的顺序服务数据单元 SDU所携带序列号的下一个序 列号。
8. 一种数据处理装置, 应用于基站, 包括:
第一接收模块, 设置为接收源基站发送的切换请求, 其中, 所述切换请求 中携带有分组数据汇聚协议 PDCP的上行序列号和 /或下行序列号,所述源基站 和所述目标基站采用的无线接入技术不相同;
第二接收模块, 设置为接收所述源基站发送的与所述 PDCP的上行序列号 和 /或所述下行序列号对应的数据;
第三发送模块, 设置为使用与该目标基站的无线接入技术匹配的所述 PDCP的上行序列号和 /或下行序列号, 将所述数据发送给所述 UE。
9. 根据权利要求 8所述的装置, 其中, 还包括:
处理模块,设置为通过以下方式之一将所述 PDCP的上行序列号和 /或下行 序列号转换为所述与该目标基站的无线接入技术匹配的序列号:
所述源基站的无线接入技术为长期演进 LTE, 所述目标基站的无线接入技 术为全球移动通信*** GSM, 确定所述源基站确定模式下数据承载的 12位序 列号的低 10位置为所述匹配的序列号;
如果所述源基站的无线接入技术为所述 LTE, 所述目标基站的无线接入技 术为时分同步码分多址接入 TD-CDMA, 确定所述源基站确定模式下数据承载 的 12位序列号与 0xfi)0组成的 16位数字作为所述匹配的序列号;
如果所述源基站的无线接入技术为所述 GSM,所述目标基站的无线接入技 术为所述 LTE, 确定所述源基站确定模式下数据承载的 10位序列号与 0x300 组成的 12位数字作为所述匹配的序列号;
如果所述源基站的无线接入技术为所述 TD-CDMA, 所述目标基站的无线 接入技术为所述 LTE,确定所述源基站确定模式下数据承载的 16位序列号的低 12位数字作为所述匹配的序列号。
10. 根据权利要求 8或 9所述的装置, 其中, 所述 PDCP上行序列号为: 确认模式 下, 所述 PDCP/子网相关会聚协议 S DCP的第一个未成功传输或未确认的协 议数据单元 PDU的序列号; 所述 PDCP下行序列号为: 所述确定模式下, 所述 PDCP/S DCP发送给上层的顺序服务数据单元 SDU所携带序列号的下一个序 列号。
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