WO2011000306A1 - 无线自回程传输的切换处理方法及装置 - Google Patents

无线自回程传输的切换处理方法及装置 Download PDF

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Publication number
WO2011000306A1
WO2011000306A1 PCT/CN2010/074666 CN2010074666W WO2011000306A1 WO 2011000306 A1 WO2011000306 A1 WO 2011000306A1 CN 2010074666 W CN2010074666 W CN 2010074666W WO 2011000306 A1 WO2011000306 A1 WO 2011000306A1
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Prior art keywords
base station
downlink packet
backhaul
self
packet
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PCT/CN2010/074666
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English (en)
French (fr)
Inventor
林高全
陈卫民
刘晟
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 EP10793601.5A priority Critical patent/EP2451211B1/en
Publication of WO2011000306A1 publication Critical patent/WO2011000306A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H04W36/0235—Buffering or recovering information during reselection by transmitting sequence numbers, e.g. SN status transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention claims to be submitted to the Chinese Patent Office on July 2, 2009, and the application number is 200910152004. 0.
  • TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a handover processing method and apparatus for wireless self-backhaul transmission.
  • a wireless self-traffic transmission mode is used as a transmission bearer of a base station by a mobile terminal, that is, in a same wireless system, a transmission problem of a part of small base stations is solved by cascading two-level wireless access links.
  • packet data from the Secondary BS is carried by the backhaul UE (User Equipment, User Equipment) and the Primary BS (secondary base station), and then sent to the core network element, such as LTE (Long Term). Evolution, Long Term Evolution) S-GW (Serving-Gateway, Service Gateway) or WiMAX (Worldwide Interoperabi lity for Microwave Access) AGW (Access Gateway).
  • LTE Long Term Evolution
  • S-GW Serving-Gateway, Service Gateway
  • WiMAX Worldwide Interoperabi lity for Microwave Access
  • the backhaul UE is a common UE for the Primary BS; the Primary BS is similar to the macro base station, and supports wide coverage and high mobile speed; the Secondary BS is similar to micro BS (micro cell base station), Pico BS (pico cell base station), Femtocell ( Small base stations of the home base station, plus external or built-in backhaul UEs, support hotspots, home, enterprise coverage, low moving speed, etc., can also be regarded as L3 Relay (Layer 3 Relay) base stations, followed by self-backhaul base stations simultaneously Also refers to the L3 Relay base station.
  • L3 Relay Layer 3 Relay
  • Wireless self-backhaul is more suitable for supplementary coverage, especially for coverage scenarios such as hole scenarios, indoor coverage scenarios, and home coverage scenarios, where the base station requires a low rate, and the wired network deployment is difficult or costly, and is also used to improve the cell edge. User performance.
  • This complementary coverage solution is less costly and is the best combination of low cost wireless transmission networks and low cost wireless supplemental coverage. Therefore, reducing the base station bearer cost by self-backhaul transmission is also an effective solution, and compared with the microwave transmission, the self-backhaul transmission supports point-to-multipoint, which can achieve unified maintenance and unified installation, and can solve the non-view to a certain extent. Distance transmission can greatly reduce operating costs.
  • wireless self-backhaul transmission whether it is for WCDMA (Wide-Band Code Division Multiple Access) or LTE (including FDD and TDD; FDD: Frequency division duplex, frequency division duplex; TDD : Time division duplex, time division duplex) or WiMAX system
  • the standard is to achieve self-backhaul transmission while minimizing the impact on existing standard protocols. If no optimization is done, the self-backhaul mobility can be achieved according to the existing standard switching process.
  • the radio resource is used between the self-backhaul base station/L3 Relay and the eNB (eNodeB, the base station), and the handover is completed in the UE and the MME (Mobility Management, Entity, Mobile Management Unit)
  • the MME Mobility Management, Entity, Mobile Management Unit
  • all downlink data is sent to the self-backhaul base station/L3 Relay along the tunnel before the handover.
  • the self-backhaul base station/L3 Relay has sent a handover command to the UE, the UE can no longer be under it.
  • the data that has been sent to the self-backhaul base station/L3 Relay must be forwarded to the target base station eNB, and the self-backhaul base station/L3 Relay also applies for the return air interface resource to forward the received data. Therefore, there is a case where the downlink data stream wastes radio resources between the backhaul base station/L3 Relay and the target base station eNB. At the same time, due to the existence of round-trip data flow, it may also cause loss of data packets and transmission delay.
  • the embodiment of the present invention provides a method for switching a wireless self-backhaul transmission, which can improve the utilization of air interface resources and the reliability of data transmission, and reduce the delay of packet transmission.
  • the method includes:
  • the primary base station After receiving the handover request message sent by the backhaul base station, the primary base station buffers the downlink packet;
  • the primary base station sends the buffered downlink packet to the terminal through the target base station.
  • the embodiment of the present invention further provides a handover processing method for wireless self-backhaul transmission, which is used to improve the utilization of air interface resources and the reliability of data transmission, and reduce the delay of packet transmission.
  • the method includes:
  • the self-travel base station determines, according to the downlink packet start sequence number, the downlink packet that is not buffered by the primary base station. And sending the uncached downlink packet;
  • the self-backhaul base station receives the lost packet request message sent by the primary base station, and sends the downlink that is not buffered by the primary base station according to the lost packet request message. Grouping.
  • the embodiment of the present invention further provides a primary base station in self-backhaul transmission, which is used to improve air resource resource utilization and data transmission reliability, and reduce packet transmission delay.
  • the base station includes:
  • a receiving module configured to receive a handover request message sent by the backhaul base station
  • a buffering module configured to: after the receiving module receives the handover request message sent by the backhaul base station, buffer the downlink packet; And a sending module, configured to send the buffered downlink packet to the terminal by using the target base station.
  • the embodiment of the present invention further provides a self-backhauling base station in the self-backhaul transmission, which is used to improve the utilization of the air interface resource and the reliability of the data transmission, and reduce the delay of the packet transmission.
  • the base station includes:
  • a receiving module configured to receive a handover request acknowledgement message sent by the primary base station, and receive a lost packet request message sent by the primary base station when the downlink request start sequence number is not carried in the handover request acknowledgement message;
  • a sending module configured to: when the downlink request start sequence number buffered by the primary base station after the relay link starts to be detuned in the handover request acknowledgement message, determine, according to the downlink packet start sequence number, a downlink that is not buffered by the primary base station And sending the uncached downlink packet after receiving the lost packet request message sent by the primary base station, and sending the downlink packet that is not buffered by the primary base station according to the lost packet request message.
  • the embodiment of the present invention further provides a communication system, which is used to improve the utilization of air interface resources and the reliability of data transmission, and reduce the delay of packet transmission.
  • the communication system includes:
  • a self-backhaul base station configured to send a handover request message
  • a primary base station configured to: after receiving the handover request message sent by the backhaul base station, buffer the downlink packet; and send the buffered downlink packet;
  • the target base station is configured to receive the buffered downlink packet sent by the primary base station, and send the buffered downlink packet, where the terminal is configured to receive the buffered downlink packet sent by the target base station.
  • the embodiment of the present invention further provides a communication system, which is used to improve the utilization of air interface resources and the reliability of data transmission, and reduce the delay of packet transmission.
  • the communication system includes:
  • a primary base station configured to send a handover request acknowledgement message
  • a self-backhaul base station configured to receive a handover request acknowledgement message sent by the primary base station; and when the handover request acknowledgement message carries a downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned, according to the downlink packet
  • the start sequence number determines a downlink packet that is not buffered by the primary base station and sends the uncached downlink packet; when the handover request acknowledgement message does not carry the downlink packet start sequence number, receives a lost packet sent by the primary base station And requesting, sending, according to the lost packet request message, a downlink packet that is not buffered by the primary base station.
  • the primary base station after receiving the handover request message sent by the self-backhaul base station, the primary base station buffers the downlink packet; the primary base station sends the buffered downlink packet to the terminal through the target base station; thus, it is not necessary to have all the downlink packet data in the main
  • the round-trip transmission between the base station and the self-backhaul base station enables seamless handover of the wireless self-backhaul transmission, which not only reduces the waste of radio resources between the primary base station and the self-backhaul base station, improves the utilization of air interface resources, but also improves data transmission. Reliability, reducing the delay of packet transmission.
  • the self-backhaul base station receives the handover request acknowledgement message sent by the primary base station; if the handover request acknowledgement message carries the downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned, The backhaul base station determines, according to the downlink packet start sequence number, a downlink packet that is not buffered by the primary base station, and sends the uncached downlink packet; if the downlink request start sequence number is not carried in the handover request acknowledgement message, The backhaul base station receives the lost packet request message sent by the primary base station, and sends the downlink packet that is not buffered by the primary base station according to the lost packet request message; so that the self-backhaul base station does not have to send the downlink packet that the primary base station has buffered, and avoids all downlink packets.
  • the data is transmitted back and forth between the primary base station and the self-backhaul base station, which can reduce the waste of radio resources between the primary base station and the self-backhaul base station, improve the utilization of air interface resources, and improve the reliability of data transmission and reduce the delay of packet transmission.
  • FIG. 1 is a schematic diagram of data flow of a UE switching from a self-backhaul base station/L3 Relay to a same eNB according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of data flow of a UE switching from a self-backhaul base station/L3 Relay to another eNB according to another embodiment of the present invention
  • FIG. 3 is a schematic diagram of data flow between a self-backhaul base station/L3 Relay in the same eNB according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of data flow of switching between a self-backhaul base station/L3 Relay under different eNBs according to another embodiment of the present invention.
  • FIG. 5 and FIG. 8 are schematic flowcharts of a method for processing handover of a wireless self-backhaul transmission according to an embodiment of the present invention
  • FIG. 6 and FIG. 7 are flowcharts of a specific example of a method for processing handover of a wireless self-backhaul transmission according to an embodiment of the present invention
  • 10 and FIG. 11 are schematic structural diagrams of a base station according to an embodiment of the present invention
  • FIG. 12 and FIG. 13 are schematic diagrams showing the structure of a communication system according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS The objects, technical solutions, and advantages of the embodiments of the present invention will be more clearly understood.
  • FIG. 1_4 shows the downlink data flow in the four handover scenarios in the prior art, where FIG. 1 shows the UE from the self-backhaul.
  • the base station/L3 Relay switches the data flow direction to the same eNB; FIG.
  • FIG. 2 shows the data flow direction of the UE switching from the self-backhaul base station/L3 Relay to another eNB
  • FIG. 3 shows the self-backhaul base station/L3 under the same eNB. Data flow of switching between Relays
  • Figure 4 shows the data flow of switching between self-backhaul base stations/L3 Relays under different eNBs.
  • the downlink data flow has a solid line forwarding path as shown in Figure 1-4, because the eNB and the self-backhaul base station/L3 The relays are carried by the wireless air interface resources. At this time, there is a round trip of the downlink data stream, which doubles the radio resources, and at the same time increases the packet transmission delay, thereby increasing the possibility of downlink data transmission loss.
  • the embodiment of the present invention considers forwarding according to the dotted path in FIG. The waste of air interface resources between the eNB and the relay base station is eliminated, and the reliability of data transmission and the packet transmission delay are reduced.
  • the flow of the handover processing method for the wireless self-backhaul transmission may be as follows: Step 501: After receiving the handover request message sent by the self-backhaul base station, the primary base station buffers the downlink packet. Step 502: The primary base station sends the buffered downlink packet to the terminal by using the target base station.
  • the primary base station buffers the downlink packet; the primary base station sends the buffered downlink packet to the terminal by using the target base station; After receiving the handover request message sent by the backhaul base station, the downlink packet is not buffered, but the downlink packet is directly forwarded to the self-backhaul base station.
  • the embodiment of the present invention does not need to have all downlink packet data in the primary base station and the self-backhaul base station.
  • the round-trip transmission enables seamless handover of wireless self-backhaul transmission, which not only reduces the waste of radio resources between the primary base station and the self-backhaul base station, improves the utilization of air interface resources, but also improves the reliability of data transmission and reduces packet transmission. Delay.
  • the handover request message may carry downlink tunnel information, such as a downlink GTP tunnel endpoint, in step 501.
  • the primary base station may decompose the downlink tunnel according to the downlink tunnel information in the handover request message. , get the downstream packet and cache.
  • the primary base station may extract and buffer the downlink tunnel information from the handover request message, so as to decrypt the downlink tunnel.
  • the primary base station may be the target base station of the handover, or may not be the target base station of the handover.
  • the downlink tunnel information may be buffered according to the downlink tunnel information to obtain a downlink packet.
  • the primary base station may first buffer the downlink tunnel information, and after receiving the handover request acknowledgement message sent by the target base station, the downlink tunnel is obtained according to the downlink tunnel information, and the downlink packet is obtained.
  • the primary base station may not forward the downlink packet to the self-backhaul base station, and may continue to forward the downlink packet to the self-backhaul base station.
  • the primary base station does not forward the downlink packet to the self-backhaul base station after buffering the downlink packet, if the sequence number status transmission message sent by the self-backhaul base station is subsequently forwarded to the target base station, the packet that is not sent by the self-backhaul base station needs to be sent. The data is forwarded to the target base station.
  • the primary base station After the self-backhaul base station transmits the downlink packets that are not successfully transmitted and not transmitted, the primary base station receives the end marker packet or signaling sent from the backhaul base station, and forwards the buffered downlink packet to the target base station. After the primary base station intercepts the end marker packet or signaling sent by the serving gateway to the self-backhaul base station, the downlink tunnel is stopped, and the end marker packet or signaling is sent to the target base station after forwarding the buffered downlink packet.
  • the primary base station does not forward the downlink packet to the self-backhaul base station after the downlink packet is buffered.
  • the embodiment of the present invention is applicable to the handover through the S1 interface and the handover through the X2 interface, and according to the LTE handover procedure, the main difference is that the handover message needs to be transited by the MME, and the handover is performed through the S1 interface.
  • the switching by X2 is taken as an example, and the switching process of S1 and U can be analogized.
  • the handover is initiated by the backhaul base station/L3 Relay, and the primary base station eNB buffers the downlink data of the tunnel; and the downlink data is not sent to the self-backhaul base station/L3 Relay, and the specific steps of the handover process may be as follows:
  • Step 601 When the UE detects that the handover report needs to be sent, send the measurement report to the self-backhaul base station; in this example, it is assumed that the data channel of the UE under the backhaul base station has been established, as shown by the hollow arrow in FIG. 6, where the self-backhaul base station It is transmitted through the GTP tunnel between the S-GW and the S-GW.
  • Step 602 The self-backhaul base station receives the measurement report message, and sends a handover request message to the selected target base station, where the handover request message needs to carry downlink tunnel information of the backhaul base station, such as a downlink GTP tunnel endpoint.
  • the signaling flow of the target base station as the primary base station eNB of the self-backhaul base station is shown by a solid line in FIG. 6; if the target base station is another primary base station or another self-backhaul base station, the primary base station as shown in FIG. eNB1/self-backhaul base station 1, the self-backhaul base station communicates with the target base station through its primary base station eNB, and the signaling flow at this time is indicated by a broken line in the figure.
  • the solid line with a hollow arrow in FIG. 6 shows the data flow direction when the target base station is the primary base station eNB of the self-backhaul base station; the dotted line with a hollow arrow indicates that the target base station is another primary base station or another self.
  • the flow of data when the base station is backhauled.
  • the master base station eNB of the self-backhaul base station receives the handover request message to check whether there is a downlink GTP tunnel endpoint. If yes, the master base station eNB saves the information about the GTP tunnel.
  • the self-backhaul base station selects its primary base station eNB as the target base station, the handover request message is not forwarded again; when the self-backhaul base station selects Alternatively, another primary base station or another self-backhaul base station is used as the target base station.
  • the primary base station eNB1/self-backhaul base station 1 needs to continue forwarding to the target base station handover request message, which may be forwarded before forwarding.
  • the GTP tunnel information of the self-backhaul base station in the original handover request message is deleted; at this time, the uplink tunnel between the target base station and the S-GW of the handover is already available.
  • Step 603 If the primary base station eNB of the self-backhaul base station is the target base station, after the downlink tunnel information carried in the handover request message is saved, the downlink packet that is decomposed by using the downlink tunnel information is started, and the downlink packet is buffered and not forwarded.
  • the self-backhaul base station sends a handover request acknowledgement message to the self-backhaul base station; if the primary base station eNB of the self-backhaul base station is not the target base station, after receiving the handover request acknowledgement message returned from the target base station, the primary base station eNB starts to use the saved
  • the downlink tunnel information de- tunnels the downlink packet and buffers the downlink packet without forwarding to the self-backhaul base station, and forwards the received handover request acknowledgement message to the self-backhaul base station.
  • Step 604 After receiving the handover request acknowledgement message sent by the primary base station eNB, the self-backhaul base station sends a handover command to the UE.
  • Step 605 The self-backhaul base station sends an SN status transmission message to the target base station; if the self-backhaul base station has not yet transmitted the packet data, it needs to be forwarded to the target base station by the dotted arrow in FIG. 6;
  • the primary base station eNB is notified by sending an end marker packet or by a signaling message that it has no downlink data.
  • Step 606 After receiving the handover command, the UE starts to access the target base station, and then sends a handover confirmation message to the target base station, where the uplink and downlink data channels from the UE to the target base station have been established; and the downlink data forwarded in step 605 can be Sent to the UE.
  • Step 607 The primary base station eNB receives the end marke-r packet or signaling message sent by the self-backhaul base station in step 605, and starts forwarding the buffered packet to the target base station. Meanwhile, after receiving the handover confirmation message of the UE, the target base station And sending a packet handover request to the MME, where the message carries the downlink tunnel information of the target base station, such as the downlink GTP tunnel endpoint information, where the original downlink tunnel may be selected for the dual tunnel mode and the primary base station eNB is the target base station.
  • the target base station After receiving the handover confirmation message of the UE, the target base station And sending a packet handover request to the MME, where the message carries the downlink tunnel information of the target base station, such as the downlink GTP tunnel endpoint information, where the original downlink tunnel may be selected for the dual tunnel mode and the primary base station eNB is the target base station.
  • Step 608 The MME sends a bearer update request to the S-GW.
  • the MME may instruct the S_GW to continue to use the original tunnel endpoint.
  • the uplink and downlink tunnel between the target base station and the S-GW has been established; Sending an end marker packet to the handover source base station, that is, the self-backhaul base station, or directly transmitting a signaling message to notify the primary base station eNB that no downlink data is sent to the source base station; after the primary base station eNB intercepts the end marker packet, the saved GTP tunnel information is deleted.
  • Step 609 The target base station receives the packet handover request acknowledgement message from the MME, and sends a release resource message to the source base station, that is, the self-backhaul base station, to release the related bearer resource.
  • the primary base station simultaneously performs the operation of the primary base station and the operation of the target base station to ensure the sequential transmission.
  • the primary base station may send a handover request acknowledgement message to the self-backhaul base station, where the handover request acknowledgement message carries the relay link and starts to de-tunnel the primary base station.
  • the buffered downlink packet start sequence number and when the sequence number status transmission message sent from the backhaul base station is subsequently forwarded to the target base station, the primary base station determined by the self-backhaul base station according to the downlink packet start sequence number is not cached
  • the downlink packet is forwarded to the target base station.
  • the primary base station may also send a lost packet request message, where the lost packet request message indicates that the backhaul base station sends the downlink packet that is not buffered by the primary base station.
  • the primary base station may forward the sequence number status transmission message sent by the backhaul base station to the target base station, and may further determine, according to the serial number status information of the relay link in the sequence number status transmission message, that the buffered downlink group has been The successfully transmitted downlink packet does not forward the successfully transmitted downlink packet to the target base station.
  • sequence number status transmission message may further carry sequence number status information of the access link.
  • the mapping relationship between the serial number status information of the access link and the serial number status information of the relay link is maintained by the secondary base station.
  • the primary base station receives the end marker packet or signaling sent from the backhaul base station, and forwards the buffered downlink packet to the target base station.
  • the primary base station intercepts the end marker packet or signaling sent by the serving gateway to the self-backhaul base station, the downlink tunnel is stopped, and the end marker packet or signaling is sent to the target base station after forwarding the buffered downlink packet.
  • the primary base station continues to forward the downlink packet to the self-backhaul base station after buffering the downlink packet.
  • the switching through the X2 interface is taken as an example.
  • the handover is initiated by the backhaul base station/L3 Relay, and the primary base station eNB continues to send the downlink data to the self-backhaul base station/L3 Relay while buffering the downlink data of the tunnel.
  • the specific steps of the handover process may be as follows:
  • Step 701 When the UE detects that the handover report needs to be sent, send the measurement report to the self-backhaul base station.
  • the data channel of the UE under the backhaul base station has been established, as shown by the hollow arrow in FIG. 7, where the self-backhaul base station It is transmitted through the GTP tunnel between the S-GW and the S-GW.
  • the signaling flow when the target base station is the primary base station eNB of the self-backhaul base station is shown by a solid line in FIG. 7; if the target base station is another primary base station or another self-backhaul base station, as shown in FIG.
  • the base station eNB1/self-backhaul base station 1 communicates with the target base station through its primary base station eNB, and the signaling flow at this time is indicated by a broken line in the figure.
  • the solid line with a hollow arrow in FIG. 6 shows the data flow direction when the target base station is the primary base station eNB of the self-backhaul base station; the dotted line with a hollow arrow indicates that the target base station is another primary base station or another self.
  • the master base station eNB of the self-backhaul base station receives the handover request message to check whether there is a downlink GTP tunnel endpoint. If yes, the master base station eNB saves the information about the GTP tunnel.
  • the self-backhaul base station selects its primary base station eNB as the target base station, the handover request message is not forwarded; when the self-backhaul base station selects another primary base station or another self-backhaul base station as the target base station, as shown in FIG.
  • the primary base station eNB1/self-backhaul base station 1 needs to continue to forward the handover request message to the target base station, and the GTP tunnel information of the self-backhaul base station in the original handover request message can be deleted before forwarding; An uplink tunnel between the S-GWs is already available.
  • Step 703 If the primary base station eNB of the self-backhaul base station is the target base station, after the downlink tunnel information carried in the handover request message is saved, the downlink packet that is de-tuned by using the downlink tunnel information is started, and the downlink packet is buffered and further forwarded to The self-backhaul base station sends a handover request acknowledgement message to the self-backhaul base station, where the message carries the downlink packet start sequence number SN buffered by the primary base station eNB after the relay link starts to be detuned; if the primary base station eNB of the self-backhaul base station is not the target After receiving the handover request acknowledgement message returned by the target base station, the base station eNB starts to use the saved downlink tunnel information to de-route the downlink packet and buffer the downlink packet, and continues to forward to the self-backhaul base station. In the handover request acknowledgement message forwarded by the base station, the start sequence number SN of the downlink packet buffered by
  • Step 704 After receiving the handover request acknowledgement message sent by the primary base station eNB, the self-backhaul base station sends a handover command to the UE.
  • Step 705 The self-backhaul base station sends an SN state transmission message to the target base station, where the message carries the access link.
  • the SN status information and the SN status information of the relay link are as follows: the number of the downlink packet, the counter, the uplink packet b itmap, and the like, and the primary base station eNB receives the SN status transmission message according to the SN status of the relay link.
  • the information determines which of the buffered downlink data has been successfully sent, and then does not forward to the target base station; the primary base station eNB forwards the SN status transmission message carrying the access link SN status information to the target base station;
  • the packet data that has not been sent according to the downlink packet start SN buffered by the primary base station eNB in step 703 Determining the uncached packet in the primary base station eNB, and forwarding it to the target base station through the dotted arrow in the dotted line in FIG. 7; when the self-backhaul base station transmits the unsuccessful and unsent packet of the UE, by sending the end m-arker
  • the packet is notified to the primary base station eNB by means of a signaling message that it has no downlink data.
  • Step 706 After receiving the handover command, the UE starts to access the target base station, and then sends a handover confirmation message to the target base station. At this time, the uplink and downlink data channels from the UE to the target base station are established; and the downlink data forwarded in step 705 can be Sent to the UE.
  • Step 706a If the primary eNB does not carry the SN of the buffered downlink packet in the handover request acknowledgement message in step 703, the primary eNB needs to actively send a lost packet request message, where the downlink packet that is not buffered by the primary eNB is carried.
  • the information, the self-backhaul base station sends a packet that is not buffered by the primary base station eNB according to the message, to minimize packet transmission and save air interface resources.
  • Step 707 The primary base station eNB receives the end marker packet or signaling message sent by the self-backhaul base station in step 705, and starts forwarding the buffered downlink packet that is not successfully transmitted to the target base station. Meanwhile, the target base station receives the downlink packet. After the handover confirmation message of the UE, the UE sends a packet handover request/acknowledgement message to the MME, where the message carries the downlink tunnel information of the target base station, such as the downlink GTP tunnel endpoint information, where the dual-tunnel mode and the primary base station eNB serve as the handover target base station In case, you can choose to use the original downlink tunnel.
  • Step 708 The MME sends a bearer update request to the S-GW.
  • the MME may instruct the S_GW to continue to use the original tunnel endpoint.
  • the uplink and downlink tunnel between the target base station and the S-GW has been established; Sending an end marker packet to the handover source base station, that is, the self-backhaul base station, or directly transmitting a signaling message to notify the primary base station eNB that no downlink data is sent to the source base station; after the primary base station eNB intercepts the end marker packet, the saved GTP tunnel information is deleted.
  • the tunnel is queried; and the primary base station eNB sends an end marker packet to the target base station after forwarding the buffered downlink data.
  • Step 709 The target base station receives the packet handover request acknowledgement message from the MME, and sends a release resource message to the source base station, that is, the self-backhaul base station, to release the related bearer resource.
  • the primary base station simultaneously performs the operation of the primary base station and the operation of the target base station to ensure sequential transmission.
  • sequence number status information about the relay link and the sequence number status information processing procedure of the access link in step 705 of this example are further described below.
  • PDCP SN Packet Data Convergence Protocol
  • SN Sequence Number
  • UL/DL Count UL/DL Count
  • other status information are for different UEs under the access link.
  • the self-backhaul base station as the handover source base station needs to send the PDCP SN of the access link and its UL/DL Count status information to the target base station; and the PD-CP SN of the relay link and its UL/DL Count status.
  • the information is processed together for different UEs under the access link, such as PDCP SN. Therefore, the PDCP SN of the relay link and its UL/DL Count status information need to be differentiated according to different UEs of the access link. .
  • the self-backhaul base station and the primary base station need to maintain state information such as the PDCP SN of the handover UE, according to the figure.
  • the process of 7 is that the primary base station eNB carries the start sequence number of the handover UE of the relay buffer to the self-backhaul base station in the handover request acknowledgement message, or the primary base station eNB receives the information such as the PDCP sequence number of the relay link, Then tell the serial number of the data packet that the backhaul base station needs to forward.
  • a logical mapping relationship may be established between the self-backhaul base station and the primary base station, and the discontinuous PDCP sequence number of the handover UE is numbered into a consecutive sequence number for checking the packet transmission condition of the relay link.
  • the primary base station determines the forwarded buffered packet according to the status information such as the relay link PDCP SN sent by the self-backhaul base station, and the small packet here needs to carry the PDCP S and directly forward according to the original TP packet.
  • the self-backhaul base station and the primary base station can use the sequence number of the tunnel packet to determine that each needs to be forwarded to the handover target base station.
  • the primary base station carries the sequence number of the first GTP packet that is buffered in the handover request acknowledgement message; and the packet forwarded by the primary base station does not need to carry the PDCP SN and is directly forwarded to the handover target base station according to the original IP packet. .
  • the self-backhaul base station needs to maintain the correspondence between the PDCP SN of the relay link and the PDCP SN of the access link, ensuring that the packets corresponding to the two sequence numbers have the same transmission state. If the sequence number SN in the GTP packet header is used as the state of the relay link forwarding packet, the self-backhaul base station needs to maintain the correspondence between the sequence number of the tunnel packet and the PDCP SN of the access link.
  • the embodiment of the present invention further provides a handover processing method for wireless self-backhaul transmission, and the processing procedure may be as shown in FIG. 8, including:
  • Step 801 The self-backhaul base station receives a handover request acknowledgement message sent by the primary base station.
  • Step 802 Determine whether the handover request acknowledgement message carries a downlink packet start sequence number that is buffered by the primary base station after the relay link starts to be detuned. If yes, go to step 803; otherwise, go to step 804.
  • Step 803 The self-backhaul base station determines, according to the downlink packet start sequence number, a downlink packet that is not buffered by the primary base station, and sends the uncached downlink packet.
  • Step 804 The self-backhaul base station receives a lost packet request message sent by the primary base station, and sends a downlink packet that is not buffered by the primary base station according to the lost packet request message.
  • the self-backhaul base station further sends a sequence number status transmission message, where the sequence number status transmission message carries the sequence number status information of the relay link and the sequence number status information of the access link; the self-backhaul base station is also The mapping relationship between the serial number status information of the relay link and the serial number status information of the access link is maintained.
  • the principle of the solution shown in FIG. 8 is substantially similar to the method of the embodiment of FIG. 7. The specific steps are not described again. It can be seen from the flow shown in FIG. 8 that the self-backhaul base station does not have to send the downlink packet buffered by the primary base station, and avoids all round-trip packet data to and from the primary base station and the self-backhaul base station, and can reduce the relationship between the primary base station and the self-backhaul base station.
  • the waste of wireless resources improve the utilization of air interface resources, can also improve the reliability of data transmission and reduce the delay of packet transmission.
  • a person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium.
  • the method may include all or part of the steps in the foregoing embodiment, and the storage medium may include: a ROM, a RAM, a magnetic disk, an optical disk, and the like.
  • a base station and a communication system are also provided in the embodiments of the present invention, as described in the following embodiments. Since the principle of solving the problem of these devices is similar to the switching processing method of the wireless self-backhaul transmission, the implementation of these devices can be referred to the implementation of the method, and the repetition will not be described again.
  • An embodiment of the present invention provides a base station, and the structure thereof is as shown in FIG.
  • the receiving module 901 is configured to receive a handover request message sent by the backhaul base station;
  • the buffering module 902 is configured to cache the downlink packet after the receiving module receives the handover request message sent by the backhaul base station;
  • the sending module 903 is configured to send the buffered downlink packet to the terminal by using the switched target base station.
  • the sending module 903 is further configured to send a handover request acknowledgement message to the self-backhaul base station, where the handover request acknowledgement message carries a downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned;
  • the module 901 is further configured to receive a sequence number status transmission message sent by the backhaul base station, where the sending module 903 is further configured to forward the sequence number status transmission message to the target base station, and the self-backhaul base station according to the downlink grouping
  • the downlink packet that is not buffered by the primary base station determined by the starting sequence number is forwarded to the target base station.
  • the primary base station includes a receiving module 901, a buffering module 902, and a sending module 903.
  • the main base station may further include:
  • a determining module 904 configured to transmit a sequence number status of the relay link carried in the message according to the sequence number status Information, determining a downlink packet that has been successfully sent in the buffered downlink packet;
  • the sending module 903 is further configured to not forward the successfully sent downlink packet to the target base station when forwarding the sequence number status transmission message to the target base station.
  • the receiving module 901 is further configured to receive an end marker packet or signaling sent by the backhaul base station after the downlink packet transmission is completed.
  • the buffering module 902 can be further configured to stop the downlink tunnel after the receiving module intercepts the end marking packet or signaling sent by the serving gateway to the self-backhaul base station; the sending module 903 can also be used to forward the forwarding. After the buffered downlink packet, the end marker packet or signaling is sent to the target base station.
  • the base stations described in Figures 9 and 10 may be primary base stations in self-backhaul transmission.
  • the embodiment of the present invention further provides a base station, and the structure thereof is as shown in FIG.
  • the receiving module 1101 is configured to receive a handover request acknowledgement message sent by the primary base station, and receive the lost packet request message sent by the primary base station when the downlink request start sequence number is not carried in the handover request acknowledgement message; 1102.
  • the handover request acknowledgement message carries a downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned, determining, by the downlink packet start sequence number, a downlink packet that is not buffered by the primary base station. And sending the uncached downlink packet; after receiving the lost packet request message sent by the primary base station, sending the downlink packet that is not buffered by the primary base station according to the lost packet request message.
  • the sending module 1102 is further configured to send a sequence number status transmission message, where the sequence number status transmission message carries sequence number status information of the relay link and sequence number status information of the access link.
  • the base station illustrated in Figure 11 may be a self-backhaul base station in self-backhaul transmission.
  • the embodiment of the present invention further provides a communication system, and the structure thereof is as shown in FIG. 12, and may include:
  • the self-backhaul base station 1201 is configured to send a handover request message.
  • the primary base station 1202 is configured to: after receiving the handover request message sent by the backhaul base station, buffer the downlink packet; and send the buffered downlink packet;
  • the target base station 1203 is configured to receive the buffered downlink packet sent by the primary base station, and send the buffered downlink packet.
  • the terminal 1204 is configured to receive the cached downlink packet sent by the target base station.
  • the embodiment of the present invention further provides a communication system, and the structure thereof is as shown in FIG.
  • a primary base station 1301, configured to send a handover request acknowledgement message
  • the self-backhaul base station 1302 is configured to receive a handover request acknowledgement message sent by the primary base station, and when the handover request acknowledgement message carries a downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned, according to the downlink
  • the packet start sequence number determines a downlink packet that is not buffered by the primary base station and sends the uncached downlink packet; when the handover request acknowledgement message does not carry the downlink packet start sequence number, the received primary base station loses And a packet request message, sending, according to the lost packet request message, a downlink packet that is not buffered by the primary base station.
  • the primary base station after receiving the handover request message sent by the self-backhaul base station, the primary base station buffers the downlink packet; the primary base station sends the buffered downlink packet to the terminal through the target base station; thus, it is not necessary to have all the downlink packet data in the main
  • the round-trip transmission between the base station and the self-backhaul base station enables seamless handover of the wireless self-backhaul transmission, which not only reduces the waste of radio resources between the primary base station and the self-backhaul base station, improves the utilization of air interface resources, but also improves data transmission. Reliability, reducing the delay of packet transmission.
  • the self-backhaul base station receives the handover request acknowledgement message sent by the primary base station; if the handover request acknowledgement message carries the downlink packet start sequence number buffered by the primary base station after the relay link starts to be detuned, The backhaul base station determines, according to the downlink packet start sequence number, a downlink packet that is not buffered by the primary base station, and sends the uncached downlink packet; if the downlink request start sequence number is not carried in the handover request acknowledgement message, The backhaul base station receives the lost packet request message sent by the primary base station, and sends the downlink packet that is not buffered by the primary base station according to the lost packet request message; so that the self-backhaul base station must send the downlink packet buffered by the primary base station, thereby avoiding all downlinks.
  • the packet data is transmitted back and forth between the primary base station and the self-backhaul base station, which can reduce the waste of radio resources between the primary base station and the self-backhaul base station, improve the utilization of air interface resources, and improve the reliability of data transmission and reduce the delay of packet transmission.

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Description

无线自回程传输的切换处理方法及装置 本申请要求于 2009年 7月 2日提交中国专利局、 申请号为 200910152004. 0、 发明 名称为 "无线自回程传输的切换处理方法及装置"的中国专利申请的优先权， 其全部内 容通过引用结合在本申请中。 技术领域 本发明涉及通信技术领域， 尤其涉及无线自回程传输的切换处理方法及装置。 背景技术 无线自冋程传输方式通过移动终端作为基站的传输承载， 即在相同的无线制式下， 通过两级无线接入链路的级联， 解决部分小基站的传输问题。 无线自回程组网架构中， 通过回程 UE ( User Equipment , 用户终端设备） 与 Primary BS (主基站） 承载来自 Secondary BS (从基站）的分组数据，然后送往核心网元，如 LTE (Long Term Evolution, 长期演进） 的 S- GW ( Serving-Gateway , 服务网关） 或者 WiMAX ( Worldwide Interoperabi lity for Microwave Access , 微波接入全球互操作性） 的 AGW (Access Gateway, 接入网关）。
其中， 回程 UE对 Primary BS来说是一个普通的 UE; Primary BS类似宏基站， 支 持广覆盖、 高移动速度； Secondary BS类似 micro BS (微小区基站）、 Pico BS (微微 小区基站）、 Femtocell (家庭基站） 的小基站， 加上外置或者内置回程 UE, 支持热点、 家庭、 企业覆盖、 低移动速度等， 也可以看作是 L3 Relay (层三中继）基站， 后面的自 回程基站同时也指 L3 Relay基站。
无线自回程比较适合于补充覆盖， 特别是覆盖空洞场景、 室内覆盖场景以及家庭覆 盖场景等基站要求速率不太高、 而且有线网络部署比较困难或者成本太高的应用场景， 也用于提高小区边缘用户性能。这种补充覆盖方案的成本较低， 是低成本无线传输网络 与低成本无线补充覆盖的最佳组合。 因此， 通过自回程传输降低基站承载成本也是一种 有效的方案， 而且与微波传输相比， 自回程传输支持点对多点， 能够实现统一维护、 统 一安装， 同时可以在一定程度上解决非视距传输， 能够极大降低运营成本。
在无线自回程传输中， 无论是针对 WCDMA ( Wide-band Code Divis ion Multiple Access , 宽带码分多址接入系统）还是 LTE (包括 FDD与 TDD; FDD: Frequency division duplex, 频分双工； TDD: Time division duplex, 时分双工）或者 WiMAX系统来说， 目 标是在尽量减少对现有标准协议影响的情况下实现自回程传输。 如果不做任何优化， 自 回程的移动性按照现有的标准切换流程就可以实现。
现有技术中， 由于自回程本身的特点， 即自回程基站 /L3 Relay与 eNB (eNodeB, 基 站）之间使用的是无线资源， 在 UE完成切换以及 MME (Mobility Management, Entity, 移 动管理单元)更新 S-GW承载之前，所有的下行数据还会沿着切换前的隧道送往自回程基 站 /L3 Relay, 但由于自回程基站 /L3 Relay已经发送切换命令给 UE, UE已经不能再在 其下接收下行数据， 而且根据标准的切换流程， 此时已经送到自回程基站 /L3 Relay的 数据必须转发给目标基站 eNB, 自回程基站 /L3 Relay还会申请回程空口资源转发已经 接收到的数据， 因此， 这就存在下行数据流在自回程基站 /L3 Relay与目标基站 eNB之 间往返浪费无线资源的情况。 同时， 由于数据流向存在往返， 还可能引起数据分组的丢 失以及传输时延。 发明内容
本发明实施例提供一种无线自回程传输的切换处理方法， 能够提高空口资源利用率 和数据传输的可靠性， 减少分组传输的时延， 该方法包括：
主基站在接收自回程基站发送的切换请求消息后， 缓存下行分组；
主基站通过目标基站将所述缓存的下行分组发送给终端。
本发明实施例还提供一种无线自回程传输的切换处理方法，用以提高空口资源利用 率和数据传输的可靠性， 减少分组传输的时延， 该方法包括：
自回程基站接收主基站发来的切换请求确认消息；
若所述切换请求确认消息中携带中继链路开始解隧道后主基站缓存的下行分组起 始序列号，则自冋程基站根据所述下行分组起始序列号确定主基站未缓存的下行分组并 发送所述未缓存的下行分组；
若所述切换请求确认消息中未携带所述下行分组起始序列号，则自回程基站接收主 基站发送的丢失分组请求消息， 根据所述丢失分组请求消息， 发送所述主基站未缓存的 下行分组。
本发明实施例还提供一种自回程传输中的主基站，用以提高空口资源利用率和数据 传输的可靠性， 减少分组传输的时延， 该基站包括：
接收模块， 用于接收自回程基站发送的切换请求消息；
缓存模块， 用于在所述接收模块接收到自回程基站发送的切换请求消息后， 缓存下 行分组； 发送模块， 用于通过目标基站将所述缓存的下行分组发送给终端。
本发明实施例还提供一种自回程传输中的自回程基站， 用以提高空口资源利用率和 数据传输的可靠性， 减少分组传输的时延， 该基站包括：
接收模块， 用于接收主基站发来的切换请求确认消息； 在所述切换请求确认消息中 未携带所述下行分组起始序列号时， 还接收主基站发送的丢失分组请求消息；
发送模块，用于在所述切换请求确认消息中携带中继链路开始解隧道后主基站缓存 的下行分组起始序列号时，根据所述下行分组起始序列号确定主基站未缓存的下行分组 并发送所述未缓存的下行分组； 在接收到主基站发送的丢失分组请求消息后， 根据所述 丢失分组请求消息发送主基站未缓存的下行分组。
本发明实施例还提供一种通信系统， 用以提高空口资源利用率和数据传输的可靠 性， 减少分组传输的时延， 该通信系统包括：
自回程基站， 用于发送切换请求消息；
主基站， 用于在接收自回程基站发送的切换请求消息后， 缓存下行分组； 以及， 发 送所述缓存的下行分组；
目标基站，用于接收主基站发送的所述缓存的下行分组；发送所述缓存的下行分组； 终端， 用于接收目标基站发送的所述缓存的下行分组。
本发明实施例还提供一种通信系统， 用以提高空口资源利用率和数据传输的可靠 性， 减少分组传输的时延， 该通信系统包括：
主基站， 用于发送切换请求确认消息；
自回程基站， 用于接收主基站发送的切换请求确认消息； 在所述切换请求确认消息 中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号时，根据所述下行分组 起始序列号确定主基站未缓存的下行分组并发送所述未缓存的下行分组；在所述切换请 求确认消息中未携带所述下行分组起始序列号时， 接收主基站发来的丢失分组请求消 息， 根据所述丢失分组请求消息发送主基站未缓存的下行分组。
本发明实施例中， 主基站在接收到自回程基站发来的切换请求消息后， 缓存下行分 组； 主基站通过目标基站将缓存的下行分组发送给终端； 从而无需将所有的下行分组数 据在主基站和自回程基站之间往返传输， 即可实现无线自回程传输的无缝切换， 不仅能 够降低主基站与自回程基站之间无线资源的浪费， 提高空口资源利用率， 还能够提高数 据传输的可靠性、 减少分组传输的时延。 本发明实施例中， 自回程基站接收主基站发来的切换请求确认消息； 若所述切换请 求确认消息中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号，则自回程 基站根据所述下行分组起始序列号确定主基站未缓存的下行分组并发送所述未缓存的 下行分组； 若所述切换请求确认消息中未携带所述下行分组起始序列号， 则自回程基站 接收主基站发来的丢失分组请求消息，根据所述丢失分组请求消息发送主基站未缓存的 下行分组； 从而使自回程基站不必发送主基站已缓存的下行分组， 避免了所有的下行分 组数据在主基站和自回程基站之间往返传输，可以降低主基站与自回程基站之间无线资 源的浪费，提高空口资源利用率，还可以提高数据传输的可靠性、减少分组传输的时延。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有 技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本 发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。 在附图中：
图 1为本发明一个实施例中 UE从自回程基站 /L3 Relay切换到同一个 eNB的数据流 向示意图；
图 2为本发明另一个实施例中 UE从自回程基站 /L3 Relay切换到另一个 eNB的数据 流向示意图；
图 3为本发明又一个实施例中同一个 eNB下的自回程基站 /L3 Relay之间切换的数 据流向示意图；
图 4为本发明又一个实施例中不同 eNB下的自回程基站 /L3 Relay之间切换的数据 流向示意图；
图 5、 图 8为本发明实施例中无线自回程传输的切换处理方法流程示意图； 图 6、图 7为本发明实施例中无线自回程传输的切换处理方法的具体实例的流程图； 图 9、 图 10、 图 11为本发明实施例中基站的结构示意图；
图 12、 图 13为本发明实施例中通信系统的结构示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚明白， 下面结合附图对本发明 实施例做进一步详细说明。 在此， 本发明的示意性实施例及其说明用于解释本发明， 但 并不作为对本发明的限定。 当 UE从自回程基站 /L3 Relay发起向其他任意一个基站的切换时， 图 1_4分别示出 了现有技术中 4种切换场景下的下行数据流向， 其中， 图 1示出了 UE从自回程基站 /L3 Relay切换到同一个 eNB的数据流向； 图 2示出了 UE从自回程基站 /L3 Relay切换到另 一个 eNB的数据流向； 图 3示出了同一个 eNB下的自回程基站 /L3 Relay之间切换的数 据流向； 图 4示出了不同 eNB下的自回程基站 /L3 Relay之间切换的数据流向。
由图 1-4可以看到， 现有技术中在 MME向 S-GW发送承载更新消息之前， 都存在下 行数据流如图 1-4中的实线转发路径， 由于 eNB与自回程基站 /L3 Relay之间是通过无 线空口资源承载的， 此时存在下行数据流的往返， 会双倍占用无线资源， 同时带来分组 传输时延的增加， 从而也增大了下行数据传输丢失可能性。 为了优化在 MME向 S-GW发 送承载更新消息之前数据流向以便节约 eNB与自回程基站 /L3 Relay之间宝贵的无线空 口资源， 本发明实施例考虑按照图 1-4中的虚线路径转发， 以消除对 eNB与中继基站之 间空口资源的浪费， 同时提高数据传输的可靠性以及减少分组传输时延。
如图 5所示， 本发明实施例中， 无线自回程传输的切换处理方法流程可以如下： 步骤 501、 主基站在接收到自回程基站发来的切换请求消息后， 缓存下行分组。 步骤 502、 主基站通过目标基站将缓存的下行分组发送给终端。
图 5所示流程中， 主基站在接收到自回程基站发来的切换请求消息后， 缓存下行分 组； 主基站通过 标基站将缓存的下行分组发送给终端； 相对于现有技术中主基站在接 收到自回程基站发来的切换请求消息后并不缓存下行分组， 而是直接向自回程基站转发 所有下行分组而言，本发明实施例无需将所有下行分组数据在主基站和自回程基站之间 往返传输， 即可实现无线自回程传输的无缝切换， 不仅能够降低主基站与自回程基站之 间无线资源的浪费， 提高空口资源利用率， 还能够提高数据传输的可靠性、 减少分组传 输的时延。
一个实施例中， 步骤 501中切换请求消息可携带下行隧道信息， 例如下行 GTP隧道 端点等信息； 这样， 主基站在接收到切换请求消息后， 可以根据切换请求消息中的下行 隧道信息解下行隧道， 获得下行分组并缓存。 实施中主基站可以从切换请求消息中提取 下行隧道信息并缓存， 以便于解下行隧道。 当然， 如图 1-4所示， 主基站可以是切换的 目标基站， 也可以不是切换的目标基站。 当在主基站是切换的目标基站时， 可以在缓存 所述下行隧道信息的同时根据所述下行隧道信息解下行隧道， 获得下行分组。 当主基站 不是切换的目标基站时， 主基站可以先缓存所述下行隧道信息， 待接收到目标基站发来 的切换请求确认消息后， 再根据所述下行隧道信息解下行隧道， 获得下行分组。 另一个实施例中，主基站在缓存下行分组后，可以不再转发下行分组给自回程基站， 也可以继续转发下行分组给自回程基站。
若主基站在缓存下行分组后， 不再转发下行分组给自回程基站， 则在后续将自回程 基站发来的序列号状态传输消息转发给目标基站时， 需要将自回程基站未发送完的分组 数据转发给目标基站。
在自回程基站发送完未发送成功与未发送的下行分组后， 主基站接收自回程基站发 来的结束标记分组或信令， 向目标基站转发缓存的下行分组。 当主基站截获服务网关向 自回程基站发送的结束标记分组或信令后， 停止解下行隧道， 在转发完缓存的下行分组 后向目标基站发送结束标记分组或信令。
下面举一具体实例说明上述无线自回程传输的切换处理方法， 本例中， 主基站在缓 存下行分组后不再转发下行分组给自回程基站。 另， 由于本发明实施例适用于通过 S1 接口的切换与通过 X2接口的切换， 而根据 LTE切换流程， 对于通过 S1接口与通过 X2 接口的切换， 主要差别是切换消息需要经过 MME来中转， 因此， 本例中以及后续的实施 例都以通过 X2接 U的切换为例来描述， 对于 S1接 U的切换流程可以类推。
如图 6所示， 本例中， 自回程基站 /L3 Relay发起切换， 主基站 eNB缓存解隧道的 下行数据； 同时， 不发送该下行数据给自回程基站 /L3 Relay, 切换处理过程具体步骤 可以如下：
步骤 601、 当 UE检测到需要发送切换报告时， 发送测量报告给自回程基站； 本例中 假设自回程基站下的 UE的数据通道已经建立， 如图 6中空心箭头所示， 其中自回程基 站与 S-GW之间是通过 GTP隧道方式传递的。
步骤 602、 自回程基站接收到测量报告消息， 向选择的目标基站发送切换请求消息， 其中该切换请求消息中需要携带自回程基站的下行隧道信息， 如下行 GTP隧道端点等信 息。 图 6中以实线示出了目标基站为该自回程基站的主基站 eNB的信令流程； 若目标基 站为另外的主基站或者是另外的自回程基站， 如图 6中所示的主基站 eNBl/自回程基站 1 , 则该自回程基站通过其主基站 eNB与目标基站进行通信， 此时的信令流程在图中以 虚线表示。此外，图 6中带空心箭头的实线示出了目标基站为该自回程基站的主基站 eNB 时的数据流向； 带空心箭头的虚线示出了目标基站为另外的主基站或者是另外的自回程 基站时的数据流向。 该自回程基站的主基站 eNB接收到这个切换请求消息， 检查是否存 在下行 GTP隧道端点， 如果存在， 则主基站 eNB保存该 GTP隧道的相关信息。 当自回程 基站选择其主基站 eNB作为目标基站， 则不用再转发该切换请求消息； 当自回程基站选 择的是另外主基站或者是另外的自回程基站作为目标基站， 如图 6 中所示的主基站 eNBl/自回程基站 1 ,主基站 eNB需要继续转发给目标基站切换请求消息，在转发之前可 以删除原先切换请求消息中的自回程基站的 GTP隧道信息； 此时， 在切换的目标基站与 S-GW之间的上行隧道已经可用。
步骤 603、 如果自回程基站的主基站 eNB作为目标基站， 则在保存切换请求消息中 携带的下行隧道信息的同时， 开始利用该下行隧道信息解隧道的下行分组并缓存该下行 分组而不再转发给自回程基站， 同时向自回程基站发切换请求确认消息； 如果自回程基 站的主基站 eNB不是目标基站， 则在收到来自目标基站返回的切换请求确认消息后， 主 基站 eNB开始利用保存的下行隧道信息解隧道的下行分组并缓存该下行分组而不再转发 给自回程基站， 同时向自回程基站转发接收到的切换请求确认消息。
步骤 604、 自回程基站收到主基站 eNB发来的切换请求确认消息后， 向 UE发切换命 令。
步骤 605、 自回程基站向目标基站发送 SN状态传输消息；如果此时自回程基站还有 没有发送完的分组数据， 需要通过图 6中的虚线空心箭头所示转发给目标基站； 当自回 程基站发送完该 UE的没有发送成功与没有发送的下行分组时， 通过发送 end marker分 组或者通过信令消息通知主基站 eNB其已经没有下行数据。
步骤 606、UE收到切换命令后开始接入 标基站，然后发切换证实消息给 标基站， 此时从 UE到目标基站的上下行数据通道已经建立； 在步骤 605中转发过来的下行数据 即可送往 UE。
步骤 607、 主基站 eNB收到步骤 605中其自回程基站发送来的 end marke-r分组或 者信令消息， 开始向目标基站转发缓存的分组； 同时， 目标基站在接收到 UE的切换证 实消息后， 向 MME发送分组切换请求， 该消息中携带目标基站的下行隧道信息， 如下行 GTP隧道端点信息， 其中， 对于双隧道方式且主基站 eNB作为目标基站的情况， 可以选 择使用原来的下行隧道。
步骤 608、 MME向 S-GW发承载更新请求， 对于双隧道情况， MME可以指示 S_GW继续 使用原来的隧道端点； 此时， 目标基站与 S-GW之间的上下行隧道已经建立； S-GW向切 换源基站即自回程基站发 end marker分组， 或者直接发信令消息通知主基站 eNB已经 没有下行数据发往源基站； 主基站 eNB截获该 end marker分组后， 删除保存的 GTP隧 道信息且不再解隧道； 且主基站 eNB在转发完其缓存的下行数据后向目标基站发送 end marker分组 a 步骤 609、 目标基站收到 MME来的分组切换请求确认消息， 向源基站即自回程基站 发送释放资源消息以使其释放相关的承载资源。
图 6所示流程中， 对于切换目标是主基站 eNB本身的情况， 则主基站同时完成主基 站的操作与目标基站的操作， 以保证按序传输。
若主基站在缓存下行分组后， 继续转发下行分组给自回程基站， 则主基站可以向自 回程基站发送切换请求确认消息，所述切换请求确认消息中携带中继链路开始解隧道后 主基站缓存的下行分组起始序列号； 并在后续将自回程基站发来的序列号状态传输消息 转发给目标基站时，将自回程基站根据所述下行分组起始序列号确定的主基站未缓存的 下行分组转发给目标基站。
其中， 当上述切换请求确认消息未携带所述下行分组起始序列号， 则主基站也可以 发送丢失分组请求消息，所述丢失分组请求消息指示自回程基站发送主基站未缓存的下 行分组。
其中， 主基站将自回程基站发来的序列号状态传输消息转发给目标基站时， 还可以 根据所述序列号状态传输消息中中继链路的序列号状态信息，确定缓存的下行分组中已 成功发送的下行分组， 不再转发所述已成功发送的下行分组给目标基站。
当然， 所述序列号状态传输消息中还可以携带接入链路的序列号状态信息。接入链 路的序列号状态信息与中继链路的序列号状态信息的映射关系由从基站进行维护。
在自回程基站发送完下行分组后， 包括未发送成功与未发送的下行分组， 主基站接 收自回程基站发来的结束标记分组或信令， 向目标基站转发缓存的下行分组。 当主基站 截获服务网关向自回程基站发送的结束标记分组或信令后， 停止解下行隧道， 在转发完 缓存的下行分组后向目标基站发送结束标记分组或信令。
下面举一具体实例说明上述无线自回程传输的切换处理方法， 本例中， 主基站在缓 存下行分组后继续转发下行分组给自回程基站。 同样， 本例中以通过 X2接口的切换为 例来描述。
本例中， 自回程基站 /L3 Relay发起切换， 主基站 eNB在缓存解隧道的下行数据的 同时继续发送该下行数据给自回程基站 /L3 Relay, 如图 7所示， 切换处理过程具体步 骤可以如下：
步骤 701、 当 UE检测到需要发送切换报告时， 发送测量报告给自回程基站； 本例中 假设自回程基站下的 UE的数据通道已经建立， 如图 7中空心箭头所示， 其中自回程基 站与 S-GW之间是通过 GTP隧道方式传递的。 步骤 702、 自回程基站接收到测量报告消息， 向选择的目标基站发送切换请求消息， 其中该切换请求消息中需要携带自回程基站的下行隧道信息， 如下行 GTP隧道端点等信 息。 图 7中以实线示出了目标基站为该自回程基站的主基站 eNB时的信令流程； 若目标 基站为另外的主基站或者是另外的自回程基站， 如图 7中所示的主基站 eNBl/自回程基 站 1 , 则该自回程基站通过其主基站 eNB与目标基站进行通信， 此时的信令流程在图中 以虚线表示。 此外， 图 6中带空心箭头的实线示出了目标基站为该自回程基站的主基站 eNB时的数据流向； 带空心箭头的虚线示出了目标基站为另外的主基站或者是另外的自 回程基站时的数据流向。 该自回程基站的主基站 eNB接收到这个切换请求消息， 检查是 否存在下行 GTP隧道端点， 如果存在， 则主基站 eNB保存该 GTP隧道的相关信息。 当自 回程基站选择其主基站 eNB作为目标基站， 则不用再转发该切换请求消息； 当自回程基 站选择的是另外主基站或者是另外的自回程基站作为目标基站， 如图 7中所示的主基站 eNBl/自回程基站 1 ,主基站 eNB需要继续转发给目标基站切换请求消息，在转发之前可 以删除原先切换请求消息中的自回程基站的 GTP隧道信息； 此时， 在切换的目标基站与 S-GW之间的上行隧道已经可用。
步骤 703、 如果自回程基站的主基站 eNB作为目标基站， 则在保存切换请求消息中 携带的下行隧道信息的同时， 开始利用该下行隧道信息解隧道的下行分组并缓存该下行 分组且继续转发给自回程基站， 同时向自回程基站发切换请求确认消息， 该消息中携带 中继链路开始解隧道后主基站 eNB缓存的下行分组起始序列号 SN;如果自回程基站的主 基站 eNB不是目标基站，则在收到来自目标基站返回的切换请求确认消息后，主基站 eNB 开始利用保存的下行隧道信息解隧道的下行分组并缓存该下行分组， 同时继续转发给自 回程基站， 在向自回程基站转发的切换请求确认消息中， 增加中继链路开始解隧道后主 基站 eNB缓存的下行分组的起始序列号 SN。
步骤 704、 自回程基站收到主基站 eNB发来的切换请求确认消息后， 向 UE发切换命 令。
步骤 705、 自回程基站向目标基站发送 SN状态传输消息，该消息中携带接入链路的
SN状态信息与中继链路的 SN状态信息， 如下一个下行分组的编号、 计数器、 上行分组 b itmap等信息，主基站 eNB收到该 SN状态传输消息，根据其中携带中继链路的 SN状态 信息确定缓存的下行数据中哪些已经发送成功，则后续不再转发给目标基站；主基站 eNB 向目标基站转发携带接入链路 SN状态信息的 SN状态传输消息； 如果此时自回程基站还 有没有发送完的分组数据， 根据步骤 703中传来的主基站 eNB缓存的下行分组起始 SN 确定主基站 eNB中未缓存的分组， 通过图 7中的虚线空心箭头所示转发给目标基站； 当 自回程基站发送完该 UE 的没有发送成功与没有发送的分组时， 通过发送 end m-arker 分组或者通过信令消息通知主基站 eNB其已经没有下行数据。
步骤 706、UE收到切换命令后开始接入目标基站，然后发切换证实消息给目标基站， 此时从 UE到目标基站的上下行数据通道已经建立； 在步骤 705中转发过来的下行数据 即可送往 UE。
步骤 706a、如果步骤 703中主基站 eNB没有在切换请求确认消息中携带缓存的下行 分组的起始 SN, 则需要主基站 eNB主动发一条丢失分组请求消息， 其中携带主基站 eNB 未缓存的下行分组信息， 自回程基站根据该消息发送主基站 eNB未缓存的分组， 以最小 化分组传输节约空口资源。
步骤 707、主基站 eNB收到步骤 705中其自回程基站发送来的 end marker分组或信 令消息， 开始向目标基站转发缓存的、 并且是没有发送成功的下行分组； 同时， 目标基 站在接收到 UE的切换证实消息后， 向 MME发送分组切换请求 /确认消息， 该消息中携带 目标基站的下行隧道信息， 如下行 GTP隧道端点信息， 其中， 对于双隧道方式且主基站 eNB作为切换目标基站的情况， 可以选择使用原来的下行隧道。
步骤 708、 MME向 S-GW发承载更新请求， 对于双隧道情况， MME可以指示 S_GW继续 使用原来的隧道端点； 此时， 标基站与 S-GW之间的上下行隧道已经建立； S-GW向切 换源基站即自回程基站发 end marker分组， 或者直接发信令消息通知主基站 eNB已经 没有下行数据发往源基站； 主基站 eNB截获该 end marker分组后， 删除保存的 GTP隧 道信息且不冉解隧道； 且主基站 eNB在转发完其缓存的下行数据后向目标基站发送 end marker分组。
步骤 709、 目标基站收到 MME来的分组切换请求确认消息， 向源基站即自回程基站 发送释放资源消息以使其释放相关的承载资源。
图 7所示流程中， 对于切换目标是主基站 eNB本身的情况， 则主基站同时完成主基 站的操作与目标基站的操作， 以保证按序传输。
下面进一步描述本例步骤 705中关于中继链路的序列号状态信息以及接入链路的序 列号状态信息处理过程。
中继链路的 PDCP SN (PDCP: Packet Data Convergence Protocol , 分组数据聚合 协议； SN: Sequence Number, 序列号） 以及其 UL/DL Count (上行 /下行链路计数） 等 状态信息是针对回程链路的回程 UE的， 而不是针对自回程基站下的 UE, 而接入链路的 PDCP SN以及其 UL/DL Count等状态信息是针对接入链路下的不同 UE的。 其中， 自回程 基站作为切换源基站需要把接入链路的 PDCP SN以及其 UL/DL Count等状态信息送给目 标基站； 而中继链路的 PD-CP SN以及其 UL/DL Count等状态信息对于接入链路下的不 同 UE是一起处理的，如一起编号 PDCP SN,因此，中继链路的 PDCP SN以及其 UL/DL Count 等状态信息需要按照接入链路的不同 UE进行区分。
由于中继链路是对不同 UE—起编号， 所以对切换的 UE的 PDCP编号可能是不连续 的， 因此需要在自回程基站以及主基站都维护该切换 UE的 PDCP SN等状态信息， 按照 图 7的流程即主基站 eNB在切换请求确认消息中携带中继缓存的该切换 UE的起始序列 号给自回程基站， 或者主基站 eNB在接收到中继链路的 PDCP序列号等信息后， 再告诉 自回程基站需要转发的数据分组序号。
另外， 还可以在自回程基站与主基站分别建立一个逻辑映射关系把该切换 UE的不 连续 PDCP序列号编号成一个连续的序列号， 以便用于中继链路的分组发送情况检查。 主基站在根据自回程基站发送的中继链路 PDCP SN等状态信息确定转发的缓存分组， 这 里的分组小需要携带 PDCP S 而直接按照原来的 TP分组转发即可。 如果 GTP隧道分组 在 GTP头中携带序列号 Sequence Number ( SN), 则自回程基站与主基站 （在获得 GTP 隧道信息后） 可以使用该隧道分组的序列号来确定各自需要转发给切换目标基站的分 组， 此时主基站在切换请求确认消息中携带缓存的最开始的那个 GTP分组的序列号； 而 且主基站转发的分组不需要携带 PDCP SN而直接按照原来的 IP分组转发给切换目标基 站即可。
自回程基站需要维护中继链路的 PDCP SN与接入链路的 PDCP SN之间的对应关系， 确保两个序列号对应的分组具有相同的发送状态。 如果采用 GTP分组头中的序列号 SN 作为中继链路转发分组的状态， 则需要自回程基站维护隧道分组的序列号与接入链路的 PDCP SN的对应关系。
基于同一发明构思， 本发明实施例还提供一种无线自回程传输的切换处理方法， 处 理流程可以如图 8所示， 包括：
步骤 801、 自回程基站接收主基站发来的切换请求确认消息。
步骤 802、 判断所述切换请求确认消息中是否携带中继链路开始解隧道后主基站缓 存的下行分组起始序列号， 若是， 则执行步骤 803; 否则执行步骤 804。
步骤 803、 自回程基站根据所述下行分组起始序列号确定主基站未缓存的下行分组 并发送所述未缓存的下行分组。 步骤 804、 自回程基站接收主基站发来的丢失分组请求消息， 根据所述丢失分组请 求消息发送主基站未缓存的下行分组。
其他实施例中， 自回程基站还发送序列号状态传输消息， 所述序列号状态传输消息 中携带中继链路的序列号状态信息和接入链路的序列号状态信息； 自回程基站还对中继 链路的序列号状态信息与接入链路的序列号状态信息的映射关系进行维护。
图 8所示流程解决问题的原理与图 7实施例方法大致相似， 具体步骤不再赘述。 由 图 8所示流程可知， 自回程基站不必发送主基站已缓存的下行分组， 避免了所有的下行 分组数据在主基站和自回程基站之间往返传输，可以降低主基站与自回程基站之间无线 资源的浪费， 提高空口资源利用率， 还可以提高数据传输的可靠性、 减少分组传输的时 延。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以通 过程序来指令相关的硬件完成， 所述的程序可以存储于一计算机可读取存储介质中， 该 程序在执行时， 可以包括上述实施例方法中的全部或部分步骤， 所述的存储介质可以包 括： R0M、 RAM. 磁盘、 光盘等。
本发明实施例中还提供了一种基站、 通信系统， 如下面的实施例所述。 由于这些装 置解决问题的原理与无线自回程传输的切换处理方法相似， 因此这些装置的实施可以参 见方法的实施， 重复之处不再赘述。
本发明实施例提供一种基站， 其结构如图 9所示， 可以包括：
接收模块 901 , 用于接收自回程基站发送的切换请求消息；
缓存模块 902, 用于在所述接收模块接收到自回程基站发送的切换请求消息后， 缓 存下行分组；
发送模块 903, 用于通过切换的目标基站将所述缓存的下行分组发送给终端。
一个实施例中， 发送模块 903还可以用于向自回程基站发送切换请求确认消息， 所 述切换请求确认消息中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号； 接收模块 901还可以用于接收自回程基站发来的序列号状态传输消息；发送模块 903还 可以用于在将所述序列号状态传输消息转发给目标基站， 并将自回程基站根据所述下行 分组起始序列号确定的主基站未缓存的下行分组转发给目标基站。
如图 10所示， 本实施例与图 9所示实施例大致相同， 该主基站包括接收模块 901、 缓存模块 902和发送模块 903 , 不同之处在于， 该主基站还可以包括：
确定模块 904, 用于根据所述序列号状态传输消息中携带的中继链路的序列号状态 信息， 确定缓存的下行分组中已成功发送的下行分组；
则发送模块 903还可以用于在将所述序列号状态传输消息转发给目标基站时，不再 转发所述已成功发送的下行分组给目标基站。
另一个实施例中，接收模块 901还可以用于接收自回程基站在下行分组发送完成后， 发送的结束标记分组或信令。
另一个实施例中，缓存模块 902还可以用于在所述接收模块截获服务网关向自回程 基站发送的结束标记分组或信令后， 停止解下行隧道； 发送模块 903还可以用于在转发 完缓存的下行分组后向目标基站发送结束标记分组或信令。
图 9和图 10所述的基站可以是自回程传输中的主基站。
本发明实施例还提供一种基站， 其结构如图 11所示， 可以包括：
接收模块 1101，用于接收主基站发来的切换请求确认消息；在所述切换请求确认消 息中未携带所述下行分组起始序列号时， 还接收主基站发送的丢失分组请求消息； 发送模块 1102,用于在所述切换请求确认消息中携带中继链路开始解隧道后主基站 缓存的下行分组起始序列号时，根据所述下行分组起始序列号确定主基站未缓存的下行 分组并发送所述未缓存的下行分组； 在接收到主基站发送的丢失分组请求消息后， 根据 所述丢失分组请求消息发送主基站未缓存的下行分组。
另一个实施例中， 发送模块 1102还可以用于发送序列号状态传输消息， 所述序列 号状态传输消息中携带中继链路的序列号状态信息和接入链路的序列号状态信息。
图 11所述的基站可以是自回程传输中的自回程基站。
本发明实施例还提供一种通信系统， 其结构如图 12所示， 可以包括：
自回程基站 1201 , 用于发送切换请求消息；
主基站 1202,用于在接收自回程基站发送的切换请求消息后，缓存下行分组；以及， 发送所述缓存的下行分组；
目标基站 1203,用于接收主基站发送的所述缓存的下行分组；发送所述缓存的下行 分组；
终端 1204, 用于接收目标基站发送的所述缓存的下行分组。
本发明实施例还提供一种通信系统， 其结构如图 13所示， 可以包括：
主基站 1301 , 用于发送切换请求确认消息；
自回程基站 1302,用于接收主基站发送的切换请求确认消息；在所述切换请求确认 消息中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号时，根据所述下行 分组起始序列号确定主基站未缓存的下行分组并发送所述未缓存的下行分组；在所述切 换请求确认消息中未携带所述下行分组起始序列号时，接收主基站发来的丢失分组请求 消息， 根据所述丢失分组请求消息发送主基站未缓存的下行分组。
本发明实施例中， 主基站在接收到自回程基站发来的切换请求消息后， 缓存下行分 组； 主基站通过目标基站将缓存的下行分组发送给终端； 从而无需将所有的下行分组数 据在主基站和自回程基站之间往返传输， 即可实现无线自回程传输的无缝切换， 不仅能 够降低主基站与自回程基站之间无线资源的浪费， 提高空口资源利用率， 还能够提高数 据传输的可靠性、 减少分组传输的时延。
本发明实施例中， 自回程基站接收主基站发来的切换请求确认消息； 若所述切换请 求确认消息中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号，则自回程 基站根据所述下行分组起始序列号确定主基站未缓存的下行分组并发送所述未缓存的 下行分组； 若所述切换请求确认消息中未携带所述下行分组起始序列号， 则自回程基站 接收主基站发来的丢失分组请求消息，根据所述丢失分组请求消息发送主基站未缓存的 下行分组； 从而使自回程基站小必发送主基站已缓存的下行分组， 避免了所有的下行分 组数据在主基站和自回程基站之间往返传输，可以降低主基站与自回程基站之间无线资 源的浪费，提高空口资源利用率，还可以提高数据传输的可靠性、减少分组传输的时延。 以上所述的具体实施例， 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例而已， 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
1、 一种无线自回程传输的切换处理方法， 其特征在于， 该方法包括：
主基站在接收自回程基站发送的切换请求消息后， 缓存下行分组；
主基站通过目标基站将所述缓存的下行分组发送给终端。
2、 如权利要求 1所述的方法， 其特征在于， 所述主基站在接收自回程基站发送的 切换请求消息后， 缓存下行分组， 包括：
主基站在接收自回程基站发送的切换请求消息后，根据所述切换请求消息中的下行 隧道信息解下行隧道， 获得下行分组并缓存。
3、 如权利要求 1所述的方法， 其特征在于， 还包括：
主基站向自回程基站发送切换请求确认消息，所述切换请求确认消息中携带中继链 路开始解隧道后主基站缓存的下行分组起始序列号；
主基站将自回程基站发来的序列号状态传输消息转发给目标基站， 并将自回程基站 根据所述下行分组起始序列号确定的主基站未缓存的下行分组转发给目标基站。
4、 如权利要求 3所述的方法， 其特征在于， 还包括：
主基站根据所述序列号状态传输消息中携带的中继链路的序列号状态信息，确定缓 存的下行分组中已成功发送的下行分组，不再转发所述已成功发送的下行分组给目标基 站。
5、 如权利要求 1所述的方法， 其特征在于， 还包括：
主基站在截获服务网关向自回程基站发送的结束标记分组或信令后，停止解下行隧 道；
主基站在向目标基站转发完缓存的下行分组后向目标基站发送结束标记分组或信 令。
6、 一种无线自回程传输的切换处理方法， 其特征在于， 该方法包括：
自回程基站接收主基站发来的切换请求确认消息；
若所述切换请求确认消息中携带中继链路开始解隧道后主基站缓存的下行分组起 始序列号，则自回程基站根据所述下行分组起始序列号确定主基站未缓存的下行分组并 发送所述未缓存的下行分组；
若所述切换请求确认消息中未携带所述下行分组起始序列号，则自回程基站接收主 基站发送的丢失分组请求消息， 根据所述丢失分组请求消息， 发送所述主基站未缓存的 下行分组。
7、 如权利要求 6所述的方法， 其特征在于， 还包括： 所述自回程基站发送序列号 状态传输消息，所述序列号状态传输消息中携带中继链路的序列号状态信息和接入链路 的序列号状态信息。
8、 一种自回程传输中的主基站， 其特征在于， 包括：
接收模块， 用于接收自回程基站发送的切换请求消息；
缓存模块， 用于在所述接收模块接收到自回程基站发送的切换请求消息后， 缓存下 行分组；
发送模块， 用于通过目标基站将所述缓存的下行分组发送给终端。
9、 如权利要求 8所述的主基站， 其特征在于， 所述发送模块进一步用于向自回程 基站发送切换请求确认消息，所述切换请求确认消息中携带中继链路开始解隧道后主基 站缓存的下行分组起始序列号；
所述接收模块进一步用于接收自回程基站发来的序列号状态传输消息；
所述发送模块进一步用于在将所述序列号状态传输消息转发给目标基站， 并将自回 程基站根据所述下行分组起始序列号确定的主基站未缓存的下行分组转发给目标基站。
10、 如权利要求 9所述的主基站， 其特征在于， 还包括：
确定模块， 用于根据所述序列号状态传输消息中携带的中继链路的序列号状态信 息， 确定缓存的下行分组中已成功发送的下行分组；
所述发送模块进一步用于在将所述序列号状态传输消息转发给目标基站时，不再转 发所述已成功发送的下行分组给目标基站。
11、 如权利要求 8所述的主基站， 其特征在于， 所述缓存模块进一步用于在所述接 收模块截获服务网关向自回程基站发送的结束标记分组或信令后， 停止解下行隧道； 所述发送模块进一步用于在向目标基站转发完缓存的下行分组后向目标基站发送 结束标记分组或信令。
12、 一种自回程传输中的自回程基站， 其特征在于， 包括：
接收模块， 用于接收主基站发来的切换请求确认消息； 在所述切换请求确认消息中 未携带所述下行分组起始序列号时， 还接收主基站发送的丢失分组请求消息；
发送模块，用于在所述切换请求确认消息中携带中继链路开始解隧道后主基站缓存 的下行分组起始序列号时，根据所述下行分组起始序列号确定主基站未缓存的下行分组 并发送所述未缓存的下行分组； 在接收到主基站发送的丢失分组请求消息后， 根据所述 丢失分组请求消息发送主基站未缓存的下行分组。
13、 如权利要求 12所述的自回程基站， 其特征在于， 所述发送模块进一步用于发 送序列号状态传输消息，所述序列号状态传输消息中携带中继链路的序列号状态信息和 接入链路的序列号状态信息。
14、 一种通信系统， 其特征在于， 包括：
自回程基站， 用于发送切换请求消息；
主基站， 用于在接收自回程基站发送的切换请求消息后， 缓存下行分组； 以及发送 所述缓存的下行分组；
目标基站，用于接收主基站发送的所述缓存的下行分组；发送所述缓存的下行分组； 终端， 用于接收目标基站发送的所述缓存的下行分组。
15、 根据权利要求 14所述的通信系统， 其特征在于，
所述主基站，进一步用于根据所述切换请求消息中的下行隧道信息解下行隧道以获 得所述下行分组并缓存。
16、 根据权利要求 14所述的通信系统， 其特征在于，
所述主基站，还用于将所述自回程基站发来的序列号状态传输消息转发给所述目标 基站， 并将所述自回程基站根据所述下行分组起始序列号确定的所述主基站未缓存的下 行分组转发给所述目标基站。
17、 根据权利要求 14所述的通信系统， 其特征在于，
所述主基站，还用于根据所述序列号状态传输消息中携带的中继链路的序列号状态 信息， 确定缓存的下行分组中已成功发送的下行分组， 不再转发所述已成功发送的下行 分组给所述目标基站。
18、 根据权利要求 14所述的通信系统， 其特征在于，
所述主基站，还用于在截获服务网关向所述自回程基站发送的结束标记分组或信令 后， 停止解下行隧道； 并且在向所述目标基站转发完缓存的下行分组后向所述目标基站 发送结束标记分组或信令。
19、 一种通信系统， 其特征在于， 包括：
主基站， 用于发送切换请求确认消息；
自回程基站， 用于接收主基站发送的切换请求确认消息； 在所述切换请求确认消息 中携带中继链路开始解隧道后主基站缓存的下行分组起始序列号时，根据所述下行分组 起始序列号确定主基站未缓存的下行分组并发送所述未缓存的下行分组；在所述切换请 求确认消息中未携带所述下行分组起始序列号时， 接收主基站发来的丢失分组请求消 息， 根据所述丢失分组请求消息发送主基站未缓存的下行分组。
20、 根据权利要求 19所述的通信系统， 其特征在于，
所述自回程基站， 还用于发送序列号状态传输消息， 所述序列号状态传输消息中携 带中继链路的序列号状态信息和接入链路的序列号状态信息；
所述主基站，还用于根据所述中继链路的序列号状态信息确定缓存的下行分组中已 成功发送的下行分组， 不再转发所述已成功发送的下行分组给目标基站。
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