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WO2010127493A1 - Procédé, station de base et noeud de relais pour traitement de transfert - Google Patents

Procédé, station de base et noeud de relais pour traitement de transfert Download PDF

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Publication number
WO2010127493A1
WO2010127493A1 PCT/CN2009/071674 CN2009071674W WO2010127493A1 WO 2010127493 A1 WO2010127493 A1 WO 2010127493A1 CN 2009071674 W CN2009071674 W CN 2009071674W WO 2010127493 A1 WO2010127493 A1 WO 2010127493A1
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WO
WIPO (PCT)
Prior art keywords
data packet
user equipment
base station
receiving
relay node
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2009/071674
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English (en)
Chinese (zh)
Inventor
常俊仁
李亚娟
张亮亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2009/071674 priority Critical patent/WO2010127493A1/fr
Priority to CN200980149442XA priority patent/CN102246555B/zh
Publication of WO2010127493A1 publication Critical patent/WO2010127493A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • the present invention relates to the field of communications, and in particular, to a handover processing method, a base station, and a relay node. Background technique
  • the downlink data packet can be processed in at least the following two ways: For the RLC (Radio Link Contro l) confirmation mode, The eNB (Evolved Node B) that is currently accessing the UE (User Equipment) sequentially forwards all downlink packets and their sequence numbers that are not correctly received by the UE to the eNB to be accessed by the UE; In the mode, the eNB currently accessing the UE forwards only the downlink data packet that is not sent to the UE to the eNB of the UE to be accessed. In addition, during the handover process, for the RLC acknowledgement mode or the RLC unacknowledged mode, the eNBs currently accessing the UE will send all successfully received uplink data packets to the S-GW (Serving Gateway Service Gateway).
  • S-GW Serving Gateway Service Gateway
  • an RN Relay Node
  • LTE-A Long Term Evolution Advanced
  • the ARQ (Automatic Repeat Reques) mechanism used in the RN-introduced system is mainly divided into two types: end-to-end mechanism and mega-mechanism.
  • end-to-end mechanism When transmitting by using the end-to-end mechanism, after the eNB buffers the data packet received from the S-GW (Serving Gateway), the eNB sends the data packet to the corresponding RN, and the eNB receives the acknowledgement of the UE feedback forwarded by the RN.
  • the eNB clears the data packet from the cache. However, since the eNB waits until the acknowledgment message reported by the UE clears the buffer, when the eNB serves multiple RNs, the eNB occupies a large cache.
  • a hop-by-hop transmission technique is adopted.
  • the eNB buffers the data packet received from the S-GW, the eNB buffers the data packet received by the S-GW, and sends the data packet to the corresponding RN.
  • the eNB confirms that the data packet has been correctly received by the RN, the eNB caches the data packet. Clear the data in Package. Therefore, the eNB does not need to wait for the feedback confirmation information of the UE to occupy too much buffer.
  • the inventors have found that at least the following problems exist in the prior art: when the UE uses a hop-by-hop mechanism to transmit, when the UE switches from one RN to the eNB or other target node of the RN, The data packet to the RN may have been cleared by the eNB. The RN needs to transmit the data packet sent by the eNB back to the eNB to prevent data loss, and this backhaul process wastes the radio resource between the RN and the eNB.
  • Embodiments of the present invention provide a handover processing method, a base station, and a relay node, which are capable of conserving radio resources during handover.
  • a switching processing method includes:
  • the data packet of the user equipment in the cache is stopped.
  • the lost data packet is acquired from the source relay node according to the reception status information.
  • a base station comprising:
  • a handover determining unit configured to determine whether the user equipment needs to be switched
  • a stop clearing unit configured to stop clearing data of the user equipment in the cache when the handover determining unit determines that the user equipment needs to be switched, or after the handover determining unit determines that the user equipment needs to be switched Package
  • An information acquiring unit configured to acquire, by the source relay node, the receiving status information of the user equipment
  • a switching processing method includes:
  • the lost data packet is sent to the source evolved base station according to the packet loss message.
  • a relay node comprising:
  • a status information sending unit configured to send, to the source evolved base station, receive status information of the user equipment
  • a packet loss message receiving unit configured to receive a packet loss message sent by the source evolved base station
  • a lost data sending unit configured to When receiving the packet loss message, the packet loss receiving unit sends the lost data packet to the source evolved base station according to the packet loss message.
  • the handover processing method, the base station, and the relay node provided by the embodiment of the present invention stop the clearing of the source relay in the cache by the source evolved base station when determining that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • Receiving, by the node, the data packet of the user equipment, and acquiring, by the source relay node, the receiving status information of the user equipment, and when determining that there is a lost data packet according to the receiving status information, according to the receiving status information The source relay node obtains the lost data packet, reduces the possibility that the source evolved base station loses the data packet during the handover process, reduces the number of cleared data packets that the source relay node returns to the source evolved base station, and saves the radio resource.
  • FIG. 1 is a schematic flowchart of a handover processing method according to an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of a handover processing method provided in Case 1 according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a handover processing method provided in Case 2 according to an embodiment of the present invention
  • a schematic flowchart of a handover processing method provided in Case 3
  • FIG. 5 is a schematic flowchart of a handover processing method provided in case 4 of the embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a handover processing method provided in case 5 of the embodiment of the present invention
  • FIG. 8 is a schematic flowchart diagram of a handover processing method provided in case 7 in the embodiment of the present invention
  • FIG. 9 is a schematic diagram of a handover processing method according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart diagram of another handover processing method provided in Case 2 according to an embodiment of the present invention.
  • FIG. 11 is a schematic flow chart of another handover processing method provided in case 3 in the embodiment of the present invention.
  • FIG. 12 is a schematic flow chart of another handover processing method provided in Case 4 according to an embodiment of the present invention.
  • FIG. 13 is a schematic flowchart of another handover processing method according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of a relay node according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram of a handover processing system according to an embodiment of the present invention.
  • the embodiment of the present invention provides a handover processing method. As shown in FIG. 1 , the handover processing method of the embodiment of the present invention includes:
  • the source evolved base station stops clearing the data packet of the user equipment in the cache when determining that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • a source re- y node refers to a relay node accessed by a user equipment before handover
  • Source An evolved base station (source eNB, S-eNB) refers to a donor evolved base station of a source relay node accessed by a user equipment
  • a target relay node (Target re l ay node , mentioned in the following description)
  • the T-RN is the relay node that the user equipment accesses after the handover
  • the target eNB refers to the evolved base station that the user equipment accesses after the handover, or the target that the user equipment accesses after the handover.
  • the relay node grants the evolved base station.
  • the source evolved base station may also stop sending the data packet of the user equipment to the source relay node.
  • the source evolved base station acquires the receiving state information of the user equipment from the source relay node.
  • the source relay node may send a reception status report to the source evolved base station, and the source evolved base station acquires the reception status information of the user equipment from the received reception status report.
  • the source relay node may also carry the receiving status information in the handover request sent to the source evolved base station, and the source evolved base station acquires the receiving status information of the user equipment from the received handover request.
  • the source evolved base station acquires a lost data packet from the source relay node according to the received state information when determining that there is a lost data packet according to the received state information.
  • the source evolved base station may further send the data packet of the user equipment and/or the receiving status message of the user equipment to the target node according to the receiving status information.
  • the handover processing method provided by the embodiment of the present invention stops the clearing of the user received by the source relay node in the cache when the source evolved base station determines that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • a data packet of the device and acquiring, by the source relay node, the receiving state information of the user equipment, and when determining that there is a lost data packet according to the receiving state information, acquiring, according to the receiving state information, the source relay node
  • the lost data packet reduces the possibility of the source evolved base station losing data packets during the handover process, reduces the number of cleared data packets returned by the source relay node to the source evolved base station, and saves radio resources.
  • the UE switching from the S-RN to the target node may be mainly divided into the following four cases: the UE switches from the S-RN to the S-eNB; the UE switches from the S-RN to the T-eNB; the UE from the S-RN The RN switches to the T-RN accessing the T-eNB; the UE switches from the S-RN to the T-RN accessing the S-eNB.
  • the decision of the UE handover may also be made by the S-eNB to make a UE handover decision.
  • the S-RN makes a UE handover decision, and the UE switches from the S-RN to the S-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • the UE sends a measurement report to the source relay node, where the source relay node makes a handover decision according to the measurement report and other radio resource information, and selects the source evolved base station as the target node.
  • the source relay node sends a handover request to the source evolved base station, where the handover request includes the UE's context information and the like.
  • the handover request can be implemented by using a message mode of the X2 interface, or by using an RRC message.
  • the source evolved base station After receiving the handover request, the source evolved base station determines, after determining that the target node is the source evolved base station, performs the admission control according to the handover request, and if it is determined that the user equipment is allowed to access according to the admission control result, the source evolves.
  • the base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • the S-eNB may parse the handover request, and obtain information of the target node as the S-eNB from the handover request.
  • the handover request may further carry a target address, and after receiving the handover request sent by the S-RN, the S-eNB determines that the target address of the handover request is itself, parses the handover request, and acquires the target node from the handover request. Information for the S-eNB.
  • the S-eNB stops clearing the data packet of the UE in the cache, that is, whether the data packet of the UE sent by the S-RN to the S-RN has been correctly received, and the cached data packets are all No more cleaning.
  • the start time of the S-eNB to stop clearing the data packet of the UE in the buffer may be the time when the S-eNB determines that the UE needs to be handed over, or may be the time when the S-eNB determines that the UE needs to be handed over until the S-eNB stops to the S.
  • the arbitrary time between when the RN transmits the data packet may be the time when the S-eNB stops transmitting the data packet to the S-RN.
  • the S-eNB may stop clearing the start time of the data packet of the UE in the buffer, which may be determined by the S-eNB. The time when the UE needs to be handed over to any time between when the S-eNB determines that the UE is allowed to be handed over, or the S-eNB determines that the UE is The moment when the switch is allowed.
  • the S-eNB may stop sending the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB sends a handover request acknowledgement to the S-RN, it stops sending the data packet of the UE to the S-RN.
  • the S-eNB may stop sending the data packet of the UE to the S-RN when determining that the UE is allowed to access;
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is delayed by a period of time T than determining that the UE is allowed to access.
  • the S-RN may also send a handover command (or an RRC connection reconfiguration message with mobility control information), and the S-RN will first receive the new one from the S-eNB but has not yet sent to the UE.
  • the sequence number of the data packet is sent to the S-eNB; when the S-eNB receives the sequence number information, the data packet of the UE is stopped from being sent to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops sending the data packet of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN.
  • the source evolved base station sends a handover request acknowledgement to the source relay node.
  • the source relay node After receiving the handover request acknowledgement sent by the source evolved base station, the source relay node sends the reception status report of the user equipment to the source evolved base station.
  • the S-RN may stop sending a data packet to the UE and send a reception status report of the UE to the S-eNB when receiving the handover request acknowledgement, or may stop the UE when transmitting the handover command to the UE.
  • the data packet is transmitted and the reception status report of the UE is sent to the S-eNB.
  • the S-eNB may send the reception status report of the UE to the S-eNB when the handover request is sent in step 202.
  • the content of the reception status report is different in the RLC confirmation mode and the RLC non-confirmation mode:
  • the reception status report may include a sequence number of one or more new data packets finally transmitted by the S-RN to the UE and a reception status of the data packet, and a sequence number of the data packet that is not correctly received by the UE.
  • the receiving status report may also include a sequence number of one or more new data packets that the S-RN does not transmit to the UE first, and a sequence number of the data packet that is not correctly received by the UE.
  • the receiving status report may not carry the sequence number of the data packet that is not correctly received by the UE, but carries the sequence number of the data packet that has been correctly received by the UE.
  • the receiving status report may be a message, or may be other forms.
  • the S-RN sends one or more special termination point data packets to the S-eNB, where the termination point data packet includes the S-RN to the UE.
  • the sequence number of the last transmitted one or more new data packets indicating that the current S-RN has stopped transmitting data to the UE from which data packet.
  • the S-RN includes, in the status report sent to the S-eNB, a sequence number of the data packet that is received by the S-RN before the termination packet and that is included in the termination packet and that is not correctly acknowledged by the UE.
  • the reception status report may include a sequence number of one or more new data packets that the S-RN last transmitted to the UE or a sequence number of one or more new data packets that the S-RN did not transmit to the UE first.
  • the sequence number of the data packet mentioned in the embodiment of the present invention may be a serial number of a PDCP SDU (Packet Data Center Protocol Data Service Unit) or an RLC SDU (Radio Link Control Service) Data Uni t, radio link control service data unit) serial number, or RLC PDU (Radio Link Control Protoco l Data Uni t, radio link control protocol data unit) serial number, can also be RTP/UDP/IP/ESP, etc.
  • the serial number of the core network packet can also be a mapping table, The correspondence between the RLC PDUs that are not correctly received by the UE and the sequence numbers between other data packets (such as PDCP data packets or core network data packets) is indicated in the mapping table.
  • the source evolved base station After receiving the receiving status report, the source evolved base station clears the excess data packet in the cache according to the receiving status report.
  • the S-eNB determines the method for determining the excess data packet according to the receiving status report in the RLC acknowledge mode and the RLC unacknowledged mode:
  • the S-eNB may determine the sequence number in the cache according to the sequence number of the new data packet finally sent by the S-RN to the UE and the sequence number of the data packet that is not correctly received by the UE, and the sequence number of the data packet of the UE in the cache. Before the sequence number of the last transmitted data packet, and not the sequence number of the data packet that is not correctly received by the UE, the data packet that has been correctly received by the UE is confirmed, and the determined data packet that has been correctly received by the UE is determined as Extra packets are cleared.
  • the S-eNB may also use the sequence number of the new data packet that the S-RN does not send to the UE first and the sequence number of the data packet that is not correctly received by the UE, and the sequence number of the data packet of the UE in the cache. It is determined that the data packet that has been correctly received by the UE is confirmed and cleared.
  • the S-eNB may determine that the cache has been forwarded according to the sequence number of the new data packet sent by the S-RN to the UE or the sequence number of the new data packet that is not sent first, and the sequence number of the data packet of the UE in the cache.
  • the data packet sent by the UE clears the determined data packet that has been sent to the UE as a redundant data packet.
  • the source evolved base station determines, according to the received status report, that a lost data packet exists, determines a lost data packet according to the received status report, and sends a packet loss message to the source relay node, where the packet loss message carries The determined serial number of the lost data packet.
  • the S-eNB determines the method of determining the lost data packet according to the received status report in the RLC acknowledge mode and the RLC unacknowledged mode:
  • the S-eNB determines, according to the sequence number of the data packet that is not correctly received by the UE and the sequence number of the data packet of the UE in the cache, that the data packet that is not in the cache and that is not correctly received by the UE is determined, The determined data packet that is not correctly received by the UE is confirmed as a lost data packet.
  • the S-eNB may also determine the lost data packet according to the sequence number of the data packet that has been correctly received by the UE and the sequence number of the data packet of the UE in the cache.
  • the S-eNB determines the sequence number of the last new packet sent by the S-RN according to the sequence number of the new data packet sent by the S-RN to the UE and the sequence number of the buffered UE. A packet between the sequence numbers of the cached packets, and the determined packet is taken as a lost packet. Alternatively, the S-eNB may determine, according to the sequence number of the new data packet that the S-RN does not send to the UE first, and the sequence number of the buffered UE data packet, to determine that the sequence number is the first unsent new packet. The serial number of the data packet or the data packet of the serial number between the serial number of the new data packet that was not sent first and the serial number of the first cached data packet, and the determined data packet is regarded as the lost data packet. .
  • the source relay node After receiving the packet loss message, the source relay node obtains a sequence number of the lost data packet from the packet loss message, and sends the loss to the source evolved base station according to the sequence number of the lost data packet. Packet. After the source evolved base station receives the lost data packet sent by the source relay node, the lost data packet is buffered.
  • the user equipment performs access to the source evolved base station after receiving the handover command sent by the source relay node.
  • the S-RN makes a UE handover decision, and the UE switches from the S-RN to the T-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • the UE sends a measurement report to the source relay node, where the source relay node makes a handover decision according to the measurement report and other radio resource information, and selects the target evolved base station as the target node.
  • Step 302 is the same as step 202.
  • the source evolved base station determines that the target node is the target evolved base station, and forwards the handover request to the target evolved base station.
  • the S-eNB may parse the handover request, obtain information of the T-eNB from the handover request, and forward the handover request to the T-eNB.
  • the target evolved base station After receiving the handover request forwarded by the source evolved base station, the target evolved base station performs admission control. If the admission control result is that the user equipment is allowed to access, the target evolved base station sends a handover request acknowledgement to the source evolved base station.
  • the source evolved base station After receiving the handover request acknowledgement sent by the target evolved base station, the source evolved base station determines, according to the handover request acknowledgement, that the user equipment is allowed to access. The source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB forwards the handover request acknowledgement to the S-RN, it stops sending the data packet of the UE to the S-RN. Alternatively, the S-eNB may stop sending the data packet of the UE to the S-RN when receiving the handover request acknowledgement that the T-eNB sends the UE to allow the UE to access.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when the time delay T is delayed from the time when the handover request acknowledgement is forwarded to the S-RN.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being sent to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the data packet of the UE is sent to the S-RN.
  • Steps 306 ⁇ 31 0 are the same as steps 204 ⁇ 208.
  • the source evolved base station sends a data packet of the user equipment in the buffer to the target evolved base station; and/or sends a reception status message of the user equipment to the target evolved base station.
  • the S-eNB may send the buffered data packet of the UE and the receiving status message of the UE to the T-eNB. Or, after the UE successfully accesses the T-eNB, the S-eNB may send the data packet of the UE in the buffer and the receiving status message of the UE to the T-eNB, for example, after the UE successfully accesses the T-eNB.
  • the T-eNB sends a data transmission request to the S-eNB, and after receiving the data transmission request, the S-eNB sends the buffered data packet of the UE and the receiving status message of the UE to the T-eNB.
  • the S-eNB may sequentially forward all the data packets that are not correctly received by the UE and the sequence numbers of the data packets to the T-eNB according to the reception status report of the UE sent by the S-RN.
  • the S-eNB may also send a new data packet received from the S1 interface to the T-eNB.
  • the S-eNB may forward the reception status report of the UE received from the S-RN to the T-eNB as a reception status message.
  • the S-eNB may also send a new reception status message to the T-eNB.
  • the content of the receiving status message sent by the S-eNB to the T-eNB in the RLC acknowledge mode and the RLC unacknowledged mode is different:
  • the receiving status message includes a sequence number of one or more new data packets finally sent by the S-RN to the UE, and a receiving status of the data packet, or one or more new data packets that the S-RN does not send to the UE first.
  • Serial number Alternatively, the reception status message may include a first sequence number that the T-eNB should assign to the new data packet.
  • the receiving status message includes a sequence number of one or more new data packets finally sent by the S-RN to the UE, or a sequence number of one or more new data packets that the S-RN does not transmit to the UE first.
  • the S-eNB needs to resolve the handover request and the handover request acknowledgement.
  • the S-eNB may also not transparently parse the handover request, and transparently transmit the handover request to the target evolved base station.
  • the switching processing method of the embodiment of the present invention includes:
  • Step 1 001 is the same as step 301.
  • the source relay node sends a handover request to the source evolved base station, where the handover request includes the UE's context information, a target address, and the like.
  • the handover request may be implemented by using a message mode of the X2 interface, or by using an RRC message.
  • the source evolved base station After receiving the handover request, the source evolved base station determines that the target address of the handover request is not its own address, and transparently transmits the handover request to the target evolved base station according to the target address.
  • Step 1 004 is the same as step 304.
  • the source evolved base station After receiving the handover request acknowledgement, the source evolved base station transparently transmits the handover request acknowledgement to the source relay node.
  • the source relay node After receiving the handover request acknowledgement, the source relay node sends a handover indication message to the source evolved base station.
  • the source evolved base station After receiving the handover indication message, the source evolved base station determines, according to the handover indication message, that the user equipment is allowed to access. The source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • Steps 1 008 ⁇ 1 012 are the same as steps 307 ⁇ 31 1.
  • the S-RN makes a UE handover decision, and the UE switches from the S-RN to the T-RN of the T-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • the UE sends a measurement report to the source relay node, where the source relay node makes a handover decision according to the measurement report and other radio resource information, and selects the target relay node of the target evolved base station as the target node.
  • Step 402 is the same as step 302.
  • the source evolved base station determines that the target node is the target relay node of the target evolved base station, and forwards the handover request to the target evolved base station.
  • the target evolved base station After receiving the handover request forwarded by the source evolved base station, the target evolved base station forwards the handover request to the target relay node.
  • the S-eNB After receiving the handover request sent by the S-RN, the S-eNB may parse the handover request, obtain the information that the target node is the T-RN that is accessed by the T-eNB, and forward the handover request to the handover request. T-RN.
  • the target relay node After receiving the handover request forwarded by the target evolved base station, the target relay node performs admission control. If the admission control result is that the user equipment is allowed to access, the target relay node sends a handover request acknowledgement to the target evolved base station, and the target evolved base station forwards the handover request acknowledgement to the source evolved base station.
  • the source evolved base station determines, according to the handover request, that the user equipment is allowed to access.
  • the source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • the S-eNB may stop sending the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB forwards the handover request acknowledgement to the S-RN, it stops sending the data packet of the UE to the S-RN. Alternatively, the S-eNB may stop sending the data packet of the UE to the S-RN when receiving the handover request acknowledgement that the T-eNB sends the UE to allow the UE to access.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when the time delay T is delayed from the time when the handover request acknowledgement is forwarded to the S-RN.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being transmitted to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • Steps 406 ⁇ 41 1 are the same as steps 306 ⁇ 31 1.
  • the T-eNB may also send a bi-cast/multicast request to the E-E (Improvement Management Entity), and then fix the E to the S.
  • the GW requests to transmit the current UE's data packet to the S-eNB and the T-eNB bi-cast/multicast.
  • the S-GW agrees to perform the dual-cast/multicast, it will feedback the dual-homed/multicast request confirmation to the MN.
  • the MN E feeds back the T-eNB to the bi-cast/multicast request acknowledgement.
  • the S-eNB After receiving the handover request acknowledgement forwarded by the T-eNB, the S-eNB sends a bi-cast/multicast request to the MME, and then the MME requests the S-GW to transmit the current to the S-eNB and the T-eNB bi-cast/multicast. UE's data packet. After the S-GW agrees to perform the dual-cast/multicast, it will feedback the dual-cast/multicast request confirmation to the MN. Then, the MME feeds back the dual-homing/multicast request acknowledgement to the S-eNB.
  • the S-eNB and the T-eNB bi-cast/multicast transmit the UE data packets.
  • the S-eNB determines, according to the bi-cast/multicast flag, the data packet of the UE that is unicastly transmitted by the S-GW in the buffer, and forwards to the T-eNB in the RLC acknowledge mode that the UE does not confirm the correct reception.
  • the data packet unicast by the S-GW forwards the data packet transmitted by the S-GW to the T-eNB and transmitted by the S-GW unicast to the T-eNB in the RLC unacknowledged mode.
  • the S-eNB determines, according to the dual-cast/multicast flag, how many data packets of the UE unicast by the S-GW in the buffer are determined. For example, the S-GW may add a bi-cast/multicast flag on each bi-directional/multicast-transmitted data packet. Therefore, the S-eNB may determine that the buffered UE's data packet does not carry the bi-cast/multiple The data packet of the broadcast flag is a data packet of the UE that is unicastly transmitted by the S-GW. Alternatively, the S-GW may also add a bi-cast/multicast flag on the first bi-cast/multicast-transmitted data packet.
  • the S-eNB may determine that the serial number of the buffered UE's data packet carries the dual-cast.
  • the data packet before the sequence number of the multicast/multicast flag is the data packet of the UE that is unicast by the S-GW.
  • the S-eNB needs to resolve the handover request and the handover request acknowledgement.
  • the S-eNB may also not transparently parse the handover request, and transparently transmit the handover request to the target relay node of the target evolved base station.
  • the switching processing method of the embodiment of the present invention includes:
  • Step 1 1 01 is the same as step 401. 11 02.
  • the source relay node sends a handover request to the source evolved base station, where the handover request includes context information, a target address, and the like of the UE.
  • the handover request may be implemented by using a message mode of the X2 interface, or by using an RRC message mode.
  • the source evolved base station After receiving the handover request, the source evolved base station determines that the target address of the handover request is not its own address, and transparently transmits the handover request to the target relay node of the target evolved base station according to the target address.
  • the target relay node After receiving the handover request, the target relay node performs admission control. If the admission control result is that the user equipment is allowed to access, the target relay node sends a handover request acknowledgement to the source evolved base station.
  • the source evolved base station After receiving the handover request acknowledgement, the source evolved base station transparently transmits the handover request acknowledgement to the source relay node.
  • the source relay node After receiving the handover request acknowledgement, the source relay node sends a handover indication message to the source evolved base station.
  • the source evolved base station After receiving the handover indication message, the source evolved base station determines, according to the handover indication message, that the user equipment is allowed to access. The source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • Steps 1108 to 1112 are the same as steps 407 ⁇ 411.
  • the S-RN makes a UE handover decision, and the UE switches from the S-RN to the T-RN of the S-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • the UE sends a measurement report to the source relay node, where the source relay node makes a handover decision according to the measurement report and other radio resource information, and selects the target relay node of the source evolved base station as the target node.
  • Step 502 is the same as step 202.
  • the source evolved base station After receiving the handover request, the source evolved base station determines that the target node is a target relay node of the source evolved base station, and forwards the handover request to the target relay node.
  • the target relay node After receiving the handover request forwarded by the source evolved base station, the target relay node performs admission control. If the admission control result is that the user equipment is allowed to access, the target relay node sends the source evolved base station to the source evolved base station. Send a switch request confirmation.
  • the source evolved base station determines, according to the handover request, that the user equipment is allowed to access.
  • the source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB forwards the handover request acknowledgement to the S-RN, it stops sending the data packet of the UE to the S-RN. Alternatively, the S-eNB may stop sending the data packet of the UE to the S-RN when receiving the handover request acknowledgement that the T-RN sends the UE to allow the UE to access.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is advanced or delayed by a time T to forward the handover request acknowledgement to the S-RN.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being transmitted to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN.
  • Steps 506 ⁇ 51 0 are the same as steps 204 ⁇ 208.
  • the source evolved base station sends the data packet of the user equipment in the cache to the target relay node, and/or sends the receiving status message of the user equipment to the target relay node.
  • the S-eNB needs to resolve the handover request and the handover request acknowledgement.
  • the S-eNB may not transparently parse the handover request, and transparently transmit the handover request to the target relay point.
  • the switching processing method of the embodiment of the present invention includes:
  • Step 1201 is the same as step 501.
  • the source relay node sends a handover request to the source evolved base station, where the handover request includes the UE's context information, a target address, and the like.
  • the handover request may be implemented by using a message mode of the X2 interface, or by using an RRC message.
  • the source evolved base station determines that the target address of the handover request is not its own address, and transparently transmits the handover request to the target relay node of the access source evolved base station according to the target address.
  • Step 1204 is the same as step 504.
  • the source evolved base station After receiving the handover request acknowledgement, the source evolved base station transparently transmits the handover request acknowledgement to the source relay node.
  • the source relay node After receiving the handover request acknowledgement, the source relay node sends a handover indication message to the source evolved base station.
  • the source evolved base station After receiving the handover indication message, the source evolved base station determines, according to the handover indication message, that the user equipment is allowed to access. The source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • Steps 1208 ⁇ 1212 are the same as steps 507 ⁇ 51 1.
  • the S-eNB makes a UE handover decision, and the UE switches from the S-RN to the S-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • the user equipment sends a measurement report to the source relay node, where the source relay node forwards the measurement report sent by the user equipment to the source evolved base station.
  • the measurement report can be forwarded by using the message of the X2 interface, or by using the RRC message.
  • the source evolved base station After receiving the measurement report, the source evolved base station, according to the measurement report and other wireless resources.
  • the source information makes a switch decision and selects itself as the target node.
  • the source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the to the source relay node. The packet of the user device.
  • the S-eNB may stop sending the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB sends a handover command (or RRC connection reconfiguration message with mobility control information) to the S-RN, it stops sending the data packet of the UE to the S-RN.
  • a handover command or RRC connection reconfiguration message with mobility control information
  • the S-eNB stops or lags the time T to send the handover command to the S-RN, it stops transmitting the data packet of the UE to the S-RN.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it decides to allow the handover.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is earlier or later than the time T is determined to allow the handover.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being transmitted to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB when the S-eNB receives the reception status report of the UE transmitted by the S-RN, which is described later, the S-eNB stops transmitting the data packet of the UE to the S-eNB.
  • the source evolved base station sends a handover command to the source relay node.
  • the source relay node After receiving the handover command sent by the source evolved base station, the source relay node sends the reception status report of the user equipment to the source evolved base station.
  • the S-RN sends the receiving state of the UE to the S-eNB, refer to step 205, and details are not described herein again.
  • Steps 605 ⁇ 607 are the same as steps 206 ⁇ 208.
  • the S-eNB makes a UE handover decision, and the UE switches from the S-RN to the T-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • Step 701 is the same as step 601.
  • the source evolved base station After receiving the measurement report, the source evolved base station performs a handover decision according to the measurement report and other wireless resource information, selects the target evolved base station as the target node, and sends a handover request to the target evolved base station.
  • the target evolved base station After receiving the handover request, the target evolved base station performs admission control. If the admission control result is that the user equipment is allowed to access, the target evolved base station transmits a handover request acknowledgement to the source evolved base station.
  • the source evolved base station After receiving the handover request acknowledgement sent by the target evolved base station, the source evolved base station determines, according to the handover request acknowledgement, that the user equipment is allowed to access. The source evolved base station stops clearing the data packet of the user equipment in the cache, and stops transmitting the data packet of the user equipment to the source relay node.
  • the S-eNB may stop sending the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB sends a handover command to the S-RN, it stops sending the data packet of the UE to the S-RN. When the S-eNB stops or lags the time T to send the handover command to the S-RN, it stops transmitting the data packet of the UE to the S-RN.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it decides to allow the handover.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is earlier or later than the time T is determined to allow the handover.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB when the S-eNB receives the reception status report of the UE transmitted by the S-RN, which is described later, the S-eNB stops transmitting the data packet of the UE to the S-eNB.
  • Steps 705 ⁇ 706 are the same as steps 603 ⁇ 604.
  • Steps 707 ⁇ 71 0 are the same as steps 308 ⁇ 31 1.
  • the S-eNB determines the UE handover, and the UE switches from the S-RN to the T-RN of the T-eNB.
  • the handover processing method of the embodiment of the present invention includes:
  • Step 801 is the same as step 601.
  • the source evolved base station After receiving the measurement report, the source evolved base station performs a handover decision according to the measurement report and other radio resource information, selects a target relay node of the target evolved base station as a target node, and sends a handover request to the target evolved base station, and the target evolves.
  • the base station forwards the handover request to the target relay node.
  • the target relay node After receiving the handover request forwarded by the target evolved base station, the target relay node performs admission control. If the admission control result is that the user equipment is allowed to access, the target relay node sends a handover request acknowledgement to the target evolved base station, and the target evolved base station forwards the handover request acknowledgement to the source evolved base station.
  • the source evolved base station determines, according to the handover request, that the user equipment is allowed to access.
  • the source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the source relay node.
  • the S-eNB may stop sending the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB sends a handover command to the S-RN, it stops sending the data packet of the UE to the S-RN. When the S-eNB stops or lags the time T before the handover command is sent to the S-RN, the data packet of the UE is stopped from being sent to the S-RN.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it decides to allow the handover.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is earlier or later than the time T is determined to allow the handover.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being transmitted to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB when the S-eNB receives the reception status report of the UE transmitted by the S-RN, which is described later, the S-eNB stops transmitting the data packet of the UE to the S-eNB.
  • Steps 805 ⁇ 806 are the same as steps 603 ⁇ 604.
  • the MME requests the S-GW to transmit the UE data packet to the S-eNB and the T-eNB by using the S-eNB, or may also be the S-eNB.
  • the MME requests the S-GW to transmit the UE's data packet to the S-eNB and the T-eNB in a bi-cast/multicast manner.
  • the S-eNB forwards the data packet sent by the S-GW unicast to the T-eNB, which is not correctly received by the UE, or transmitted by the S-RN to the UE.
  • Step 8 The S-eNB makes a UE handover decision, and the UE switches from the S-RN to the S-eNB T-RN.
  • the handover processing method of the embodiment of the present invention includes: Step 901 is the same as step 601.
  • the source evolved base station After receiving the measurement report, the source evolved base station performs a handover decision according to the measurement report and other wireless resource information, selects a target relay node of the source evolved base station as a target node, and sends a handover request to the target relay node.
  • the target relay node After receiving the handover request sent by the source evolved base station, the target relay node performs admission control. If the admission control result is that the user equipment is allowed to access, the target relay node sends a handover request acknowledgement to the source evolved base station.
  • the source evolved base station determines, according to the handover request, that the user equipment is allowed to access.
  • the source evolved base station stops clearing the data packet of the user equipment in the cache, and stops sending the data packet of the user equipment to the S-eNB.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN at least at the following times:
  • the S-eNB When the S-eNB sends a handover command to the S-RN, it stops sending the data packet of the UE to the S-RN. Alternatively, the S-eNB may stop transmitting the data packet of the UE to the S-RN when it is earlier or later than the time when the handover command is sent to the S-RN.
  • the S-RN may send the sequence number of the first data packet newly received from the S-eNB but not yet transmitted to the UE to the S-eNB;
  • the serial number information is received, the data packet of the UE is stopped from being transmitted to the S-RN.
  • the S-RN may directly send a stop transmission request message to the S-eNB, requesting the S-eNB to stop transmitting the data of the UE to the S-RN.
  • the S-eNB receives the message, it stops transmitting the data of the UE to the S-RN.
  • the S-eNB may send a stop transmission request message to the S-RN, and then the S-RN sends an acknowledgement message to the S-eNB, and stops sending the UE to the S-RN when the S-eNB receives the acknowledgement message. Packet.
  • the S-eNB may stop transmitting the data packet of the UE to the S-RN.
  • Steps 905 ⁇ 906 are the same as steps 603 ⁇ 604.
  • Steps 907 ⁇ 910 are the same as steps 508 ⁇ 511.
  • the handover processing method provided by the embodiment of the present invention stops the clearing of the user received by the source relay node in the cache when the source evolved base station determines that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • a data packet of the device and acquiring, by the source relay node, the receiving state information of the user equipment, and when determining that there is a lost data packet according to the receiving state information, acquiring, according to the receiving state information, the source relay node
  • the lost data packet reduces the possibility of the source evolved base station losing data packets during the handover process, reduces the number of cleared data packets returned by the source relay node to the source evolved base station, and saves radio resources.
  • the source evolved base station or the target evolved base station requests the S-GW to multicast/multicast the data packet of the current user equipment, so that the target evolved base station can directly receive the current data from the S-GW.
  • the data packet of the user equipment forwards the data packet to the target relay node, which not only reduces the delay of data transmission, but also makes it easier for the target evolved base station to sort the data packets.
  • the embodiment of the present invention further provides a handover processing method.
  • the handover processing method of the embodiment of the present invention includes:
  • the source relay node sends the receiving state information of the user equipment to the source evolved base station.
  • the source relay node sends the lost data packet to the source evolved base station according to the packet loss message when receiving the packet loss message sent by the source evolved base station.
  • the source relay node sends the receiving state information of the user equipment to the source evolved base station, so that the source evolved base station can clear the cached data packet of the user equipment in the cache, according to the user equipment.
  • the receiving status information determines whether there is a lost data packet, and the source relay node sends a data packet to the source evolved base station according to the packet loss message sent by the source evolved base station, thereby reducing the possibility that the source evolved base station loses the data packet during the handover process, and reducing the source relay node back.
  • the number of cleared packets transmitted to the source evolved base station saves radio resources.
  • the present invention provides a base station.
  • the base station of the embodiment of the present invention includes: a handover determining unit 1401, configured to determine whether the user equipment needs to be switched;
  • the stop clearing unit 1402 is configured to stop clearing the user in the cache when the handover determining unit 1401 determines that the user equipment needs to be switched, or after the handover determining unit 1401 determines that the user equipment needs to be switched. Packet of the device;
  • the information acquiring unit 1403 is configured to acquire, by the source relay node, the receiving status information of the user equipment.
  • the lost data determining unit 1404 is configured to determine, according to the received status information acquired by the information acquiring unit 1403, whether there is a lost data packet;
  • the lost data obtaining unit 1405 is configured to: when the lost data determining unit 1404 determines that there is a lost data packet, acquire the lost data packet from the source relay node according to the receiving state information acquired by the information acquiring unit 1403. .
  • the handover determining unit 1401 specifically includes:
  • a handover request receiving subunit configured to receive a handover request sent by the source relay node, and a handover request determination subunit, configured to determine, according to the handover request received by the handover request receiving subunit, that the user equipment needs to be switched;
  • the handover determining unit 1401 specifically includes:
  • a measurement report receiving subunit configured to receive a measurement report of the user equipment sent by the source relay node
  • a measurement report determining subunit configured to determine, according to the measurement report received by the measurement report receiving subunit, that the user equipment needs to be switched.
  • the information acquiring unit 1403 includes:
  • a status report receiving subunit configured to receive a receiving status report sent by the source relay node, and a status information acquiring subunit, configured to obtain the user equipment from a receiving status report received by the status report receiving subunit Receive status information.
  • the lost data acquiring unit 1405 includes:
  • a lost data determining subunit configured to determine a lost data packet according to the received state information
  • a packet loss sending sub-unit configured to send a packet loss message to the source relay node, where the packet loss message carries a sequence number of the lost data packet determined by the lost data determining subunit
  • a lost data receiving subunit configured to receive the lost data packet sent by the source relay node.
  • the base station further includes:
  • a redundant data determining unit configured to determine, according to the receiving status information acquired by the information acquiring unit, whether there is an excess data packet
  • a cache clearing unit configured to: when the redundant data determining unit determines that there is a redundant data packet, clear the redundant data packet in the cache according to the received state information acquired by the information acquiring unit.
  • the base station further includes:
  • a data transmission unit configured to send, according to the received status information acquired by the information acquiring unit, a data packet of the user equipment to a target node;
  • the status message sending unit is configured to send the receiving status message of the user equipment to the target node according to the receiving status information acquired by the information acquiring unit.
  • the base station further includes a transmission request receiving unit, configured to receive a data transmission request sent by the target node.
  • the data transmission unit and the status message sending unit of the base station may send the data packet of the user equipment and the reception status message of the user equipment to the target node according to the data transmission request received by the transmission request receiving unit.
  • the data transmission unit specifically includes:
  • a unicast data determining subunit configured to determine a unicast sending data packet according to the bi-cast/multicast flag
  • a transport data sub-unit configured to send, to the target node, the unsuccessful according to the received state information acquired by the information acquiring unit
  • the user equipment confirms that the unicast transmission data packet is correctly received or not sent to the user equipment.
  • the base station further includes:
  • a sending request sending unit configured to send a bi-cast/multicast request to the serving gateway by using the mobility management entity, where the dual-homing/multicast request is used to request the serving gateway to evolve to the target eNodeB and the source eNodeB Station bi-cast/multicast transmission of data packets;
  • a sending acknowledgement receiving unit configured to receive a dual broadcast/multicast request acknowledgement forwarded by the mobility management entity
  • a new data receiving unit configured to receive a data packet sent by the service gateway in dual/multicast.
  • the base station provided by the embodiment of the present invention stops the clearing of the data packet of the user equipment received by the source relay node in the cache when determining that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • the embodiment of the present invention further provides a relay node.
  • the relay node of the embodiment of the present invention includes:
  • the status information sending unit 1501 is configured to send, to the source evolved base station, the receiving status information of the user equipment.
  • the packet loss receiving unit 1502 is configured to receive a packet loss message sent by the source evolved base station, and the lost data sending unit 1503 is configured to: when the packet loss message receiving unit 1502 receives the packet loss message, according to the packet loss The message sends the lost data packet to the source evolved base station.
  • the relay node further includes:
  • a handover request sending unit configured to send a handover request to the source evolved base station
  • an indication message sending unit configured to send a handover indication message to the source evolved base station
  • a handover acknowledgement receiving unit configured to receive a handover request acknowledgement sent by the source evolved base station.
  • the relay node further includes:
  • a measurement report sending unit configured to send the measurement report of the user equipment to the source evolved base station.
  • a handover command receiving unit configured to receive a handover command sent by the source evolved base station.
  • the lost data sending unit 1503 specifically includes:
  • a sequence number obtaining subunit configured to obtain a sequence number of the lost data packet from the packet loss message received by the packet loss message receiving subunit;
  • a lost data sending subunit configured to send the lost data packet to the source evolved base station according to the sequence number obtained by the sequence number obtaining subunit.
  • the relay node provided by the embodiment of the present invention sends the receiving state information of the user equipment to the source evolved base station, so that after the source evolved base station stops clearing the data packet of the user equipment in the cache, the source evolved base station may determine according to the receiving state information of the user equipment. Whether there is a lost data packet, the relay node sends a data packet to the source evolved base station according to the packet loss message sent by the source evolved base station, which reduces the possibility that the source evolved base station loses the data packet during the handover process, and reduces the source relay node back to the source. The number of cleared packets of the evolved base station saves radio resources.
  • the embodiment of the present invention further provides a handover processing system.
  • the handover processing system of the embodiment of the present invention includes an evolved base station and a relay node: the evolved base station and at least a relay node is connected; the evolved base station includes a source evolved base station 1602 and a target evolved base station 1603; the relay node includes a source relay node 1601 and a target relay node 1604; wherein the source evolved base station 1602 is configured to When it is determined that the user equipment needs to be switched, or after determining that the user equipment needs to be switched, the data packet of the user equipment in the cache is stopped; and the receiving of the user equipment is obtained from the source relay node 1601. Status information; when it is determined that there is a lost data packet according to the received status information, acquiring the lost data packet from the source relay node 1601 according to the received status information;
  • the source relay node 1601 is configured to send the receiving state information of the user equipment to the source evolved base station 1602; and send the lost data packet to the source evolved base station 1602 according to the packet loss message of the source evolved base station 1602.
  • the source evolved base station 1602 is further configured to send, according to the received state information, the data packet of the user equipment and/or the user equipment to the target evolved base station 1603 or the target relay node 1604. Receiving a status message;
  • the target evolved base station 1603 is configured to receive a data packet of the user equipment and/or a receiving status message of the user equipment sent by the source evolved base station 1602;
  • the target relay node 1604 is configured to receive a data packet of the user equipment and/or a receiving status message of the user equipment sent by the source evolved base station 1603.
  • the switching processing system stops the clearing of the user that is received by the source relay node in the cache when the source evolved base station determines that the user equipment needs to be switched, or after determining that the user equipment needs to be switched.
  • a data packet of the device and acquiring, by the source relay node, the receiving state information of the user equipment, and when determining that there is a lost data packet according to the receiving state information, acquiring, according to the receiving state information, the source relay node
  • the lost data packet reduces the possibility of the source evolved base station losing data packets during the handover process, reduces the number of cleared data packets returned by the source relay node to the source evolved base station, and saves radio resources.
  • the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Acces s Memory (RAM).

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Abstract

Les modes de réalisation de la présente invention portent sur un procédé, une station de base et un nœud de relais pour traitement de transfert, concernant le domaine des communications. Pour économiser des ressources radio durant la procédure de transfert, la solution technique décrite par le mode de réalisation de la présente invention comprend les opérations suivantes : l'élimination des paquets de données de l'équipement utilisateur dans la mémoire cache est stoppée, lorsqu'il est déterminé que l'équipement utilisateur nécessite un transfert, ou à un instant désigné après la détermination; les informations d'état de réception de l'équipement utilisateur sont acquises à partir du nœud de relais source; les paquets de données perdus sont acquis à partir du nœud de relais source conformément aux informations d'état de réception, lorsque l'existence des paquets de données perdus est déterminée conformément aux informations d'état de réception. La solution technique décrite par le mode de réalisation de la présente invention peut être appliquée au transfert dans des systèmes de communication.
PCT/CN2009/071674 2009-05-07 2009-05-07 Procédé, station de base et noeud de relais pour traitement de transfert Ceased WO2010127493A1 (fr)

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PCT/CN2009/071674 WO2010127493A1 (fr) 2009-05-07 2009-05-07 Procédé, station de base et noeud de relais pour traitement de transfert
CN200980149442XA CN102246555B (zh) 2009-05-07 2009-05-07 切换处理方法、基站及中继节点

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WO2017201743A1 (fr) * 2016-05-27 2017-11-30 华为技术有限公司 Procédé de transmission, station de base et terminal
CN115087051A (zh) * 2021-03-11 2022-09-20 中国移动通信有限公司研究院 业务处理方法、装置及相关设备

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CN110506404A (zh) 2017-05-05 2019-11-26 华为技术有限公司 一种数据接收状态报告方法及装置
WO2018210421A1 (fr) * 2017-05-18 2018-11-22 Nokia Technologies Oy Continuité de service en cas d'arrêt brusque d'un relais nomade
CN111200850B (zh) * 2018-11-19 2022-04-05 华为技术有限公司 一种通信方法及装置
CN117528639A (zh) * 2022-07-30 2024-02-06 华为技术有限公司 一种通信方法及装置
CN117176809B (zh) * 2023-09-01 2024-08-02 中科驭数（北京）科技有限公司 一种数据交互方法及系统

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WO2017201743A1 (fr) * 2016-05-27 2017-11-30 华为技术有限公司 Procédé de transmission, station de base et terminal
CN109155951A (zh) * 2016-05-27 2019-01-04 华为技术有限公司 传输方法、基站和终端
CN109155951B (zh) * 2016-05-27 2021-01-29 华为技术有限公司 传输方法、基站和终端
CN115087051A (zh) * 2021-03-11 2022-09-20 中国移动通信有限公司研究院 业务处理方法、装置及相关设备

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CN102246555A (zh) 2011-11-16

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