WO2010127493A1 - 切换处理方法、基站及中继节点 - Google Patents
切换处理方法、基站及中继节点 Download PDFInfo
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- 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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- WIPO (PCT)
- Prior art keywords
- data packet
- user equipment
- base station
- receiving
- relay node
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- 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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Description
切换处理方法、 基站及中继节点 技术领域
本发明涉及通信领域, 尤其涉及一种切换处理方法、 基站及中继节点。 背景技术
在现有的 LTE ( Long Term Evolut ion, 长期演进) 系统中, 在切换过程 中, 可以通过至少以下两种方式处理下行数据包: 对于 RLC ( Radio Link Contro l , 无线链路控制)确认模式, 当前接入 UE ( User Equipment , 用户设 备) 的 eNB ( Evolved Node B, 演进基站)按序将所有未被 UE正确接收的下 行数据包及其序号转发给待接入 UE的 eNB; 对于 RLC非确认模式, 当前接入 UE的 eNB仅将未向 UE发送的下行数据包转发给待接入 UE的 eNB。 另外, 在 切换过程中, 对于 RLC确认模式或者 RLC非确认模式, 当前接入 UE的 eNB均 会将所有成功接收的上行数据包发送给 S-GW ( Serving Gateway服务网关)。
为了提高小区边缘用户的数据吞吐量, 同时也为了扩大小区覆盖面积, 在 LTE-A ( Long Term Evolut ion Advanced, 长期演进系统的进一步增强) 系 统中引入了 RN ( Relay Node, 中继节点)。 在所述引入了 RN的系统中所采用 的 ARQ ( Automat ic Repeat Reques t , 自动重传请求)机制主要分为两种: 端 对端机制、 逐兆机制。 采用端对端机制传输时, eNB緩存从 S-GW ( Serving Gateway, 服务网关)接收的数据包后, 将该数据包发送给对应的 RN, 当该 eNB接收由该 RN转发的 UE反馈的确认信息, 确认该数据包已经被 UE正确接 收时, 该 eNB才从緩存中清除该数据包。 然而, 由于 eNB要一直等到 UE上报 的确认消息才清除緩存, 因此, 当 eNB服务多个 RN的时候, eNB占用的緩存 过大。
为克服上述问题, 一种逐跳机制的传输技术得到采用。 在采用逐跳机制 传输时, eNB緩存从 S-GW接收的数据包后, 将该数据包发送给对应的 RN, 当 该 eNB确认该数据包已经被该 RN正确接收时, 该 eNB就从緩存中清除该数据
包。 因此, eNB不需要等 UE的反馈确认信息而占用过多的緩存。 在实现本发明的过程中, 发明人发现现有技术中至少存在如下问题: 采 用逐跳机制传输时,在 UE从一个 RN切换到该 RN的 eNB或其他的目标节点时, 由于所述 eNB发往 RN的数据包可能已被 eNB清除, RN需要将 eNB发送的数据 包回传给 eNB以防数据丟失, 而这种回传过程会浪费 RN和 eNB之间的无线资 源。
发明内容
本发明的实施例提供一种切换处理方法、 基站及中继节点, 能够在切换 过程中节约无线资源。
为达到上述目的, 本发明的实施例采用如下技术方案:
一种切换处理方法, 包括:
在确定用户设备需要切换时, 或在确定所述用户设备需要切换后的指定 时刻, 停止清除緩存中所述用户设备的数据包;
从所述源中继节点获取所述用户设备的接收状态信息;
在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态 信息从所述源中继节点获取所述丟失的数据包。
一种基站, 包括:
切换确定单元, 用于确定用户设备是否需要切换;
停止清除单元, 用于在所述切换确定单元确定所述用户设备需要切换时, 或在所述切换确定单元确定所述用户设备需要切换后的指定时刻, 停止清除 緩存中所述用户设备的数据包;
信息获取单元, 用于从所述源中继节点获取所述用户设备的接收状态信 息;
丟失数据确定单元, 用于根据所述信息获取单元获取的接收状态信息确 定是否存在丟失的数据包;
包时, 根据所述接收状态信息从所述源中继节点获取所述丟失的数据包。 一种切换处理方法, 包括:
向源演进基站发送用户设备的接收状态信息;
在接收由所述源演进基站发送的丟包消息时, 根据所述丟包消息向所述 源演进基站发送丟失的数据包。
一种中继节点, 包括:
状态信息发送单元, 用于向源演进基站发送用户设备的接收状态信息; 丟包消息接收单元, 用于接收由所述源演进基站发送的丟包消息; 丟失数据发送单元, 用于在所述丟包消息接收单元接收丟包消息时, 根 据所述丟包消息向所述源演进基站发送丟失的数据包。
本发明实施例提供的切换处理方法、 基站及中继节点, 通过源演进基站 在确定用户设备需要切换时, 或者在确定所述用户设备需要切换后的指定时 刻, 停止清除緩存中被源中继节点接收的所述用户设备的数据包, 并从源中 继节点获取所述用户设备的接收状态信息, 在根据所述接收状态信息确定存 在丟失的数据包时, 根据所述接收状态信息从所述源中继节点获取丟失的数 据包, 降低切换过程中源演进基站丟失数据包的可能, 减少源中继节点回传 给源演进基站的已清除数据包数量, 节约无线资源。
附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例描述中所 需要使用的附图作一简单地介绍, 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的 前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的一种切换处理方法的流程示意图;
图 2为本发明实施例在情况 1时提供的一种切换处理方法的流程示意图; 图 3为本发明实施例在情况 2时提供的一种切换处理方法的流程示意图; 图 4为本发明实施例在情况 3时提供的一种切换处理方法的流程示意图;
图 5为本发明实施例在情况 4时提供的一种切换处理方法的流程示意图; 图 6为本发明实施例在情况 5时提供的一种切换处理方法的流程示意图; 图 7为本发明实施例在情况 6时提供的一种切换处理方法的流程示意图; 图 8为本发明实施例在情况 7时提供的一种切换处理方法的流程示意图; 图 9为本发明实施例在情况 8时提供的一种切换处理方法的流程示意图; 图 10为本发明实施例在情况 2时提供的另一种切换处理方法的流程示意 图;
图 11为本发明实施例在情况 3时提供的另一种切换处理方法的流程示意 图;
图 12为本发明实施例在情况 4时提供的另一种切换处理方法的流程示意 图;
图 1 3为本发明实施例提供的另一种切换处理方法的流程示意图; 图 14为本发明实施例提供的一种基站的构成示意图;
图 15为本发明实施例提供的一种中继节点的构成示意图;
图 16为本发明实施例提供的一种切换处理系统的构成示意图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而 不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
为了节约切换过程中所使用的 RN和 eNB之间的无线资源, 本发明实施例 提供了一种切换处理方法, 如图 1所示, 本发明实施例切换处理方法, 包括:
101、 源演进基站在确定用户设备需要切换时, 或在确定所述用户设备需 要切换后的指定时刻, 停止清除緩存中所述用户设备的数据包。
在此, 对在本发明实施例中用到的几个概念做一下描述, 其中, 源中继 节点 (source re l ay node , S-RN )是指切换前用户设备接入的中继节点; 源
演进基站 (source eNB , S-eNB )是指用户设备所接入的源中继节点的授予 ( donor )演进基站; 而在以下描述中所提到的目标中继节点 (Target re l ay node , T-RN )是指切换后用户设备接入的中继节点;目标演进基站( Target eNB, T-eNB )是指切换后用户设备接入的演进基站, 或者切换后用户设备所接入的 目标中继节点的授予 (donor ) 演进基站。
另外, 源演进基站还可以停止向所述源中继节点发送所述用户设备的数 据包。
102、 源演进基站从源中继节点获取所述用户设备的接收状态信息。
源中继节点可以向源演进基站发送接收状态报告, 源演进基站从接收的 接收状态报告中获取所述用户设备的接收状态信息。 或者, 源中继节点也可 以在向源演进基站发送的切换请求中携带接收状态信息, 源演进基站从接收 的切换请求中获取所述用户设备的接收状态信息。
103、 源演进基站在根据所述接收状态信息确定存在丟失的数据包时, 根 据所述接收状态信息从所述源中继节点获取丟失的数据包。
源演进基站还可以根据所述接收状态信息向所述目标节点发送所述用户 设备的数据包和 /或所述用户设备的接收状态消息。
本发明实施例提供的切换处理方法, 通过源演进基站在确定用户设备需 要切换时, 或者在确定所述用户设备需要切换后的指定时刻, 停止清除緩存 中被源中继节点接收的所述用户设备的数据包, 并从源中继节点获取所述用 户设备的接收状态信息, 在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态信息从所述源中继节点获取丟失的数据包, 降低切换过程 中源演进基站丟失数据包的可能, 减少源中继节点回传给源演进基站的已清 除数据包数量, 节约无线资源。
在上述实施例中, UE从 S-RN切换到目标节点主要可以分为以下四种情况: UE从 S-RN切换到 S-eNB; UE从 S-RN切换到 T-eNB; UE从 S-RN切换到接入 T-eNB的 T-RN; UE从 S-RN切换到接入 S-eNB的 T-RN。 另外, 可以由 S-RN做
出 UE切换的决定, 也可以由 S-eNB做出 UE切换的决定。 以下分别结合上述 不同情况, 对上述实施例作进一步详细描述。
情况一、 由 S-RN做出 UE切换的决定, UE从 S-RN切换到 S-eNB 如图 2所示, 本发明实施例切换处理方法, 包括:
201、 UE向源中继节点发送测量报告, 源中继节点根据测量报告以及其他 的无线资源信息做出切换决定, 选择源演进基站为目标节点。
202、 源中继节点向源演进基站发送切换请求, 该切换请求包含 UE 的上 下文信息等。 举例而言, 该切换请求可以通过使用 X2接口的消息方式实现传 输, 也可以通过采用 RRC消息方式实现传输。
203、 源演进基站接收该切换请求后, 根据所述切换请求确定目标节点为 源演进基站后, 执行准入控制, 若根据所述准入控制结果确定允许所述用户 设备接入, 则源演进基站停止清除緩存中所述用户设备的数据包, 并且停止 向所述源中继节点发送所述用户设备的数据包。
S-eNB可以在接收由 S-RN发送的切换请求后, 解析该切换请求, 从该切 换请求中获取目标节点为 S-eNB 的信息。 另外, 该切换请求还可以携带目标 地址, S-eNB在接收由 S-RN发送的切换请求后, 判断该切换请求的目标地址 为自身, 则解析该切换请求, 从该切换请求中获取目标节点为 S-eNB的信息。
在本发明实施例中, S-eNB停止清除緩存中所述 UE的数据包, 即 S-eNB 不管其发往 S-RN的 UE的数据包是否已经被正确接收, 这些已经緩存的数据 包都不再进行清除。 具体地, S-eNB停止清除緩存中所述 UE的数据包的开始 时刻可以是 S-eNB确定 UE需要切换的时刻, 也可以是 S-eNB确定 UE需要切 换的时刻到 S-eNB停止向 S-RN发送数据包的时刻之间的任意时刻, 还可以是 S-eNB停止向 S-RN发送数据包的时刻。 另外, 若 S-eNB仅停止清除緩存中的 UE的数据包, 不停止向 S-RN发送数据包, 则 S-eNB停止清除緩存中所述 UE 的数据包的开始时刻可以是 S-eNB确定所述 UE需要切换的时刻到 S-eNB确定 所述 UE被允许切换的时刻之间的任意时刻, 也可以是 S-eNB确定所述 UE被
允许切换的时刻。
在情况一中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当后述 S-eNB向 S-RN发送切换请求确认后即停止向 S-RN发送所述 UE的 数据包;
或者 S-eNB也可以在确定允许 UE接入时停止向 S-RN发送所述 UE的数据 包;
或者 S-eNB也可以在比确定允许 UE接入的时刻滞后一段时间 T时停止向 S-RN发送所述 UE的数据包。
或者也可以是 S-RN发送切换命令(或称之为带有移动性控制信息的 RRC 连接重配置消息), S-RN将第一个从 S-eNB新接收的但是还没有向 UE发送的 数据包的序列号发送给 S-eNB; 当 S-eNB接收到该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止向 S-RN发送该 UE的数据包。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-RN发送该 UE的数据包。
204、 源演进基站向源中继节点发送切换请求确认。
205、 源中继节点接收由源演进基站发送的切换请求确认后, 向源演进基 站发送所述用户设备的接收状态报告。
具体地, S-RN可以在接收到切换请求确认时就停止向 UE发送数据包并向 S-eNB发送该 UE的接收状态报告, 也可以在向 UE发送切换命令时停止向 UE
发送数据包并向 S-eNB发送该 UE的接收状态报告。 另外, S-eNB也可以在步 骤 202发送切换请求时, 将所述 UE的接收状态报告发送给 S-eNB。
在本发明实施例中, 所述接收状态报告的内容在 RLC确认模式和 RLC非 确认模式下, 有所不同:
对于 RLC确认模式:
所述接收状态报告可以包括 S-RN向 UE最后发送的一个或多个新的数据 包的序列号和该数据包的接收状态, 以及未被 UE确认正确接收的数据包的序 列号。 或者, 所述接收状态报告也可以包括 S-RN向 UE最先未发送的一个或 多个新的数据包的序列号, 以及未被 UE确认正确接收的数据包的序列号。 或 者,所述接收状态报告也可以不携带未被 UE确认正确接收的数据包的序列号, 而携带已被 UE确认正确接收的数据包的序列号。
另外, 所述接收状态报告可以是一条消息, 也可以是其他形式, 例如, S-RN向 S-eNB发送一个或者多个特殊的终止点数据包, 该终止点数据包包含 S-RN向 UE最后传输的一个或多个新的数据包的序列号,该终止点数据包表示 当前 S-RN从哪个数据包开始已经停止向 UE发送数据。并且, S-RN在向 S-eNB 发送的状态报告中包含 S-RN向 UE发送的终止数据包之前并且包含该终止数 据包在内的、 未被 UE确认正确接收的数据包的序列号。
对于 RLC非确认模式:
所述接收状态报告可以包括 S-RN向 UE最后发送的一个或多个新的数据 包的序列号或 S-RN向 UE最先未发送的一个或多个新的数据包的序列号。
本发明实施例中提到的数据包的序列号, 可以是 PDCP SDU ( Packet Da ta Convergence Protoco l Service Data Uni t , 分组数据汇聚协议业务数据单 元) 的序列号, 或者 RLC SDU ( Radio Link Control Service Data Uni t , 无 线链路控制业务数据单元) 序列号, 或者 RLC PDU ( Radio Link Control Protoco l Data Uni t, 无线链路控制协议数据单元) 序列号, 也可以是 RTP/UDP/ IP/ESP等核心网数据包的序列号。 此外, 也可以是一个映射表, 该
映射表中指示了未被 UE正确接收的 RLC PDU与其他数据包(如 PDCP数据包 或者核心网数据包)之间的序列号的对应关系。
206、 源演进基站接收所述接收状态报告后, 根据所述接收状态报告清除 緩存中多余数据包。
在本发明实施例中, S-eNB在 RLC确认模式和 RLC非确认模式下,根据接 收状态报告确定多余数据包的方法不同:
对于 RLC确认模式:
S-eNB可以根据 S-RN向 UE最后发送的新的数据包的序列号和未被 UE确 认正确接收的数据包的序列号, 以及緩存中 UE的数据包的序列号, 确定緩存 中序列号在最后发送的数据包的序列号之前, 且不是未被 UE确认正确接收的 数据包的序列号, 为已被 UE确认正确接收的数据包, 将确定的已被 UE确认 正确接收的数据包作为多余数据包清除。 或者, S-eNB也可以根据 S-RN向 UE 最先未发送的新的数据包的序列号和未被 UE 确认正确接收的数据包的序列 号, 以及緩存中 UE的数据包的序列号, 确定已被 UE确认正确接收的数据包 并进行清除。
对于 RLC非确认模式:
S-eNB可以根据 S-RN向 UE最后发送的新的数据包的序列号或最先未发送 的新的数据包的序列号, 以及緩存中 UE的数据包的序列号, 确定緩存中已经 向所述 UE发送的数据包, 将确定的已经向所述 UE发送的数据包作为多余数 据包清除。
207、 源演进基站在根据所述接收状态报告确定存在丟失数据包时, 根据 所述接收状态报告确定丟失的数据包, 并向所述源中继节点发送丟包消息, 所述丟包消息携带所述确定的丟失的数据包的序列号。
在本发明实施例中, S-eNB在 RLC确认模式和 RLC非确认模式下,根据接 收状态报告确定丟失的数据包的方法不同:
对于 RLC确认模式:
S-eNB根据未被 UE确认正确接收的数据包的序列号以及緩存中所述 UE的 数据包的序列号, 确定緩存中不存在的未被所述 UE确认正确接收的数据包, 将所述确定的未被所述 UE确认正确接收的数据包作为丟失的数据包。 或者, S-eNB也可以根据已被 UE确认正确接收的数据包的序列号以及緩存中所述 UE 的数据包的序列号确定丟失的数据包。
对于 RLC非确认模式:
S-eNB根据 S-RN向 UE最后发送的新的数据包的序列号,以及緩存的所述 UE的数据包的序列号, 确定序列号在最后发送的新的数据包的序列号与最先 緩存的数据包的序列号之间的数据包, 将所述确定的数据包作为丟失的数据 包。 或者, S-eNB也可以根据 S-RN向 UE最先未发送的新的数据包的序列号, 以及緩存的所述 UE的数据包的序列号, 确定序列号为最先未发送的新的数据 包的序列号或在最先未发送的新的数据包的序列号与最先緩存的数据包的序 列号之间的序列号的数据包, 将所述确定的数据包作为丟失的数据包。
208、 源中继节点接收所述丟包消息后, 从所述丟包消息中获取丟失的数 据包的序列号, 根据所述丟失的数据包的序列号向所述源演进基站发送所述 丟失的数据包。 源演进基站接收由所述源中继节点发送的所述丟失的数据包 后, 緩存所述丟失的数据包。
另外, 所述用户设备在接收由源中继节点发送的切换命令后, 执行向源 演进基站的接入。
情况二、 由 S-RN做出 UE切换的决定, UE从 S-RN切换到 T-eNB 如图 3所示, 本发明实施例切换处理方法, 包括:
301、 UE向源中继节点发送测量报告, 源中继节点根据测量报告以及其他 的无线资源信息做出切换决定, 选择目标演进基站为目标节点。
步骤 302同步骤 202。
303、 源演进基站接收该切换请求后, 确定目标节点为目标演进基站, 将 所述切换请求转发给目标演进基站。
S-eNB可以在接收由 S-RN发送的切换请求后, 解析该切换请求, 从该切 换请求中获取目标节点为 T-eNB的信息, 将所述切换请求转发给 T-eNB。
304、 目标演进基站接收源演进基站转发的切换请求后, 执行准入控制。 如果准入控制结果为允许该用户设备接入, 则目标演进基站向源演进基站发 送切换请求确认。
305、 源演进基站接收由所述目标演进基站发送的切换请求确认后, 根据 所述切换请求确认, 确定允许所述用户设备接入。 源演进基站停止清除緩存 中所述用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的 数据包。
在情况二中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN转发切换请求确认后即停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在接收到 T-eNB发送的包含允许 UE接入的切换请求确 认时停止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在比向 S-RN转发切换请求确认的时刻滞后一段时间 T 时停止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送该 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停
止向 S-RN发送该 UE的数据包。
步骤 306 ~ 31 0同步骤 204 ~ 208。
31 1、 源演进基站向目标演进基站发送緩存中所述用户设备的数据包; 和 /或向所述目标演进基站发送所述用户设备的接收状态消息。
S-eNB可以在接收由 S-RN发送的丟失数据包后, 就向 T-eNB发送緩存中 的所述 UE的数据包以及所述 UE的接收状态消息。 或者, S-eNB也可以在 UE 成功接入 T-eNB后, 向 T-eNB发送緩存中的所述 UE的数据包以及所述 UE的 接收状态消息, 例如, UE成功接入 T-eNB后, T-eNB向 S-eNB发送数据传输 请求, S-eNB接收所述数据传输请求后, 向 T-eNB发送緩存中的所述 UE的数 据包以及所述 UE的接收状态消息。
具体地, S-eNB可以根据 S-RN发送的 UE的接收状态报告,按序将所有下 行未被 UE正确接收的数据包及这些数据包的序列号转发给 T-eNB。另外, S-eNB 也可以将从 S 1接口接收的新的数据包发送给 T-eNB。
S-eNB可以将从 S-RN接收的该 UE的接收状态报告,作为接收状态消息转 发给 T-eNB。 或者, S-eNB也可以向 T-eNB发送一个新的接收状态消息。 在本 发明实施例中, S-eNB在 RLC确认模式和 RLC非确认模式下, 向 T-eNB发送的 接收状态消息的内容有所不同:
对于 RLC确认模式:
该接收状态消息包括 S-RN向 UE最后发送的一个或多个新数据包的序列 号以及该数据包的接收状态, 或者 S-RN向 UE最先未发送的一个或多个新的 数据包的序列号。 或者, 该接收状态消息可以包括 T-eNB应该向新的数据包 分配的第一个序列号。
对于 RLC非确认模式:
该接收状态消息包括 S-RN向 UE最后发送的一个或多个新数据包的序列 号, 或者 S-RN向 UE最先未发送的一个或多个新的数据包的序列号。
在步骤 303、 305中, S-eNB需要解析切换请求和切换请求确认。 另外,
S-eNB 还可以不解析该切换请求, 将该切换请求透传给目标演进基站。 如图 1 0所示, 本发明实施例切换处理方法, 包括:
步骤 1 001同步骤 301。
1 002、 源中继节点向源演进基站发送切换请求, 该切换请求包含 UE的上 下文信息、 目标地址等。 举例而言, 该切换请求可以通过使用 X2接口的消息 方式实现传输, 也可以通过采用 RRC消息方式实现传输。
1 003、 源演进基站接收该切换请求后, 确定切换请求的目标地址不是自 己的地址, 根据该目标地址将所述切换请求透传给目标演进基站。
步骤 1 004同步骤 304。
1 005、 源演进基站接收该切换请求确认后, 将该切换请求确认透传给源 中继节点。
1 006、 源中继节点接收该切换请求确认后, 向源演进基站发送切换指示 消息。
1 007、 源演进基站接收所述切换指示消息后, 根据所述切换指示消息确 定允许用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的数据包。
步骤 1 008 ~ 1 012同步骤 307 ~ 31 1。
情况三、 由 S-RN做出 UE切换的决定, UE从 S-RN切换到 T-eNB的 T-RN 如图 4所示, 本发明实施例切换处理方法, 包括:
401、 UE向源中继节点发送测量报告, 源中继节点根据测量报告以及其他 的无线资源信息做出切换决定, 选择目标演进基站的目标中继节点为目标节 点。
步骤 402同步骤 302。
403、 源演进基站接收该切换请求后, 确定目标节点为目标演进基站的目 标中继节点, 将所述切换请求转发给目标演进基站。 目标演进基站接收源演 进基站转发的切换请求后, 将所述切换请求转发给目标中继节点。
S-eNB可以在接收由 S-RN发送的切换请求后, 解析该切换请求, 从该切 换请求中获取目标节点为被接入 T-eNB的 T-RN的信息, 将所述切换请求转发 给 T-RN。
404、 目标中继节点接收目标演进基站转发的切换请求后,执行准入控制。 如果准入控制结果为允许该用户设备接入, 则目标中继节点向目标演进基站 发送切换请求确认, 目标演进基站将该切换请求确认转发给源演进基站。
405、 源演进基站接收该切换请求确认后, 根据该切换请求确认确定允许 所述用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并 且停止向所述源中继节点发送所述用户设备的数据包。
在情况三中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN转发切换请求确认后即停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在接收到 T-eNB发送的包含允许 UE接入的切换请求确 认时停止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在比向 S-RN转发切换请求确认的时刻滞后一段时间 T 时停止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停
止向 S-RN传输数据。
步骤 406 ~ 41 1同步骤 306 ~ 31 1。
另夕卜, T-eNB还可以在向 S-eNB发送切换请求确认后, 向丽 E ( Mob i l i ty Management Ent i ty ,移动性管理实体)发送双播 /多播请求, 然后固 E向 S-GW 请求向 S-eNB和 T-eNB双播 /多播发送当前 UE的数据包。 S-GW同意进行双播 / 多播后, 向丽 E反馈双播 /多播请求确认。 然后, 丽 E向 T-eNB反馈双播 /多播 请求确认。 或者, S-eNB在接收到 T-eNB转发的切换请求确认后, 向 MME发送 双播 /多播请求, 然后 MME向 S-GW请求向 S-eNB和 T-eNB双播 /多播发送当前 UE的数据包。 S-GW同意进行双播 /多播后, 向丽 E反馈双播 /多播请求确认。 然后, MME向 S-eNB反馈双播 /多播请求确认。
S-GW同意进行双播 /多播后,向 S-eNB和 T-eNB双播 /多播发送 UE的数据 包。在步骤 41 1中, S-eNB根据双播 /多播标志确定緩存中由 S-GW单播发送的 UE的数据包, 在 RLC确认模式下, 向 T-eNB转发未被 UE确认正确接收的由 S-GW单播发送的数据包, 在 RLC非确认模式下, 向 T-eNB转发 S-RN未向 UE 发送的由 S-GW单播发送的数据包。
S-eNB根据双播 /多播标志确定緩存中由 S-GW单播发送的 UE的数据包的 方式有艮多种。举例而言, S-GW可以在每个双播 /多播发送的数据包上添加双 播 /多播标志, 因此, S-eNB可以确定緩存的该 UE的数据包中不携带双播 /多 播标志的数据包, 为由 S-GW单播发送的该 UE的数据包。 或者, S-GW也可以 在第一个双播 /多播发送的数据包上添加双播 /多播标志, 因此, S-eNB可以确 定緩存的该 UE 的数据包中序列号在携带双播 /多播标志的数据包的序列号之 前的数据包, 为由 S-GW单播发送的该 UE的数据包。
在步骤 403、 405中, S-eNB需要解析切换请求和切换请求确认。 另外, S-eNB还可以不解析该切换请求,将该切换请求透传给目标演进基站的目标中 继节点。 如图 1 1所示, 本发明实施例切换处理方法, 包括:
步骤 1 1 01同步骤 401。
11 02、 源中继节点向源演进基站发送切换请求, 该切换请求包含 UE的上 下文信息、 目标地址等。 举例而言, 该切换请求可以通过使用 X2接口的消息 方式实现传输, 也可以通过采用 RRC消息方式实现传输。
11 03、 源演进基站接收该切换请求后, 确定切换请求的目标地址不是自 己的地址, 根据该目标地址将所述切换请求透传给目标演进基站的目标中继 节点。
11 04、 目标中继节点接收该切换请求后, 执行准入控制。 如果准入控制 结果为允许该用户设备接入, 则目标中继节点向源演进基站发送切换请求确 认。
11 05、 源演进基站接收该切换请求确认后, 将该切换请求确认透传给源 中继节点。
11 06、 源中继节点接收该切换请求确认后, 向源演进基站发送切换指示 消息。
11 07、 源演进基站接收所述切换指示消息后, 根据所述切换指示消息确 定允许用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的数据包。
步骤 1108 ~ 1112同步骤 407 ~ 411。
情况四、 由 S-RN做出 UE切换的决定, UE从 S-RN切换到 S-eNB的 T-RN 如图 5所示, 本发明实施例切换处理方法, 包括:
501、 UE向源中继节点发送测量报告, 源中继节点根据测量报告以及其他 的无线资源信息做出切换决定, 选择源演进基站的目标中继节点为目标节点。
步骤 502同步骤 202。
503、 源演进基站接收该切换请求后, 确定目标节点为源演进基站的目标 中继节点, 将所述切换请求转发给目标中继节点。
504、 目标中继节点接收源演进基站转发的切换请求后, 执行准入控制。 如果准入控制结果为允许该用户设备接入, 则目标中继节点向源演进基站发
送切换请求确认。
505、 源演进基站接收该切换请求确认后, 根据该切换请求确认确定允许 所述用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并 且停止向所述源中继节点发送所述用户设备的数据包。
在情况四中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN转发切换请求确认后即停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在接收到 T-RN发送的包含允许 UE接入的切换请求确 认时停止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在比向 S-RN转发切换请求确认的时刻提前或滞后一段 时间 T时停止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-RN发送该 UE的数据包。
步骤 506 ~ 51 0同步骤 204 ~ 208。
51 1、 源演进基站向目标中继节点发送緩存中所述用户设备的数据包, 和 /或向所述目标中继节点发送所述用户设备的接收状态消息。
S-eNB向 T-RN发送 UE的数据包以及 UE的接收状态消息的具体实现方式
可以参看步骤 301 , 在此不再贅述。
在步骤 503、 505中, S-eNB需要解析切换请求和切换请求确认。 另外, S-eNB还可以不解析该切换请求, 将该切换请求透传给目标中继点。 如图 1 2 所示, 本发明实施例切换处理方法, 包括:
步骤 1201同步骤 501。
1202、 源中继节点向源演进基站发送切换请求, 该切换请求包含 UE的上 下文信息、 目标地址等。 举例而言, 该切换请求可以通过使用 X2接口的消息 方式实现传输, 也可以通过采用 RRC消息方式实现传输。
1203、 源演进基站接收该切换请求后, 确定切换请求的目标地址不是自 己的地址, 根据该目标地址将所述切换请求透传给被接入源演进基站的目标 中继节点。
步骤 1204同步骤 504。
1205、 源演进基站接收该切换请求确认后, 将该切换请求确认透传给源 中继节点。
1206、 源中继节点接收该切换请求确认后, 向源演进基站发送切换指示 消息。
1207、 源演进基站接收所述切换指示消息后, 根据所述切换指示消息确 定允许用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的数据包。
步骤 1208 ~ 1212同步骤 507 ~ 51 1。
情况五、 由 S-eNB做出 UE切换的决定, UE从 S-RN切换到 S-eNB 如图 6所示, 本发明实施例切换处理方法, 包括:
601、 用户设备发送测量报告给源中继节点, 源中继节点将所述用户设备 发送的测量报告转发给源演进基站。 举例而言, 该测量报告可以通过使用 X2 接口的消息方式转发, 也可以通过采用 RRC消息方式转发。
602、 源演进基站接收该测量报告后, 根据该测量报告以及其他的无线资
源信息做出切换决定, 选择自己为目标节点。 执行准入控制, 若根据所述准 入控制结果确定允许所述用户设备接入, 则源演进基站停止清除緩存中所述 用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的数据包。
在情况五中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN发送切换命令(或者称之为带有移动性控制信息的 RRC 连接重配置消息 )后即停止向 S-RN发送该 UE的数据包。
当 S-eNB在比向 S-RN发送切换命令的时刻提前或滞后一段时间 T时即停 止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在决定允许切换时停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在比决定允许切换的时刻提前或滞后一段时间 T时停 止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-eNB发送该 UE的数据包。
603、 源演进基站向源中继节点发送切换命令。
604、 源中继节点接收由源演进基站发送的切换命令后, 向源演进基站发 送所述用户设备的接收状态报告。
S-RN向 S-eNB发送 UE的接收状态 >¾告的具体实现方式可以参考步骤 205 , 在此不再赘述。
步骤 605 ~ 607同步骤 206 ~ 208。
情况六、 由 S-eNB做出 UE切换的决定, UE从 S-RN切换到 T-eNB 如图 7所示, 本发明实施例切换处理方法, 包括:
步骤 701同步骤 601。
702、 源演进基站接收该测量报告后, 根据该测量报告以及其他的无线资 源信息做出切换决定, 选择目标演进基站为目标节点, 并向目标演进基站发 送切换请求。
703、 目标演进基站接收该切换请求后, 执行准入控制。 如果准入控制结 果为允许该用户设备接入, 则目标演进基站向源演进基站发送切换请求确认。
704、 源演进基站接收由目标演进基站发送的切换请求确认后, 根据所述 切换请求确认, 确定允许所述用户设备接入。 源演进基站停止清除緩存中所 述用户设备的数据包, 并且停止向所述源中继节点发送所述用户设备的数据 包。
在情况六中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN发送切换命令后即停止向 S-RN发送该 UE的数据包。 当 S-eNB在比向 S-RN发送切换命令的时刻提前或滞后一段时间 T时即停 止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在决定允许切换时停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在比决定允许切换的时刻提前或滞后一段时间 T时停 止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-eNB发送该 UE的数据包。
步骤 705 ~ 706同步骤 603 ~ 604。
步骤 707 ~ 71 0同步骤 308 ~ 31 1。
情况七、 由 S-eNB做出 UE切换的决定, UE从 S-RN切换到 T-eNB的 T-RN 如图 8所示, 本发明实施例切换处理方法, 包括:
步骤 801同步骤 601。
802、 源演进基站接收该测量报告后, 根据该测量报告以及其他的无线资 源信息做出切换决定, 选择目标演进基站的目标中继节点为目标节点, 并向 目标演进基站发送切换请求, 目标演进基站将该切换请求转发给目标中继节 点。
803、 目标中继节点接收目标演进基站转发的切换请求后,执行准入控制。 如果准入控制结果为允许该用户设备接入, 则目标中继节点向目标演进基站 发送切换请求确认, 目标演进基站将该切换请求确认转发给源演进基站。
804、 源演进基站接收该切换请求确认后, 根据该切换请求确认确定允许 所述用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并 且停止向所述源中继节点发送所述用户设备的数据包。
在情况七中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN发送切换命令后即停止向 S-RN发送该 UE的数据包。
当 S-eNB在比向 S-RN发送切换命令的时刻提前或滞后一段时间 T时即停 止向 S-RN发送该 UE的数据包。
或者 S-eNB也可以在决定允许切换时停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在比决定允许切换的时刻提前或滞后一段时间 T时停 止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-eNB发送该 UE的数据包。
步骤 805 ~ 806同步骤 603 ~ 604。
步骤 807 ~ 81 0同步骤 408 ~ 41 1。
另外,还可以 T-eNB在向 S-eNB发送切换请求确认后 ,通过 MME请求 S-GW 向 S-eNB和 T-eNB双播 /多播发送 UE的数据包, 或者, 也可以 S-eNB在接收 由 T-eNB发送的切换请求确认后, 通过 MME请求 S-GW向 S-eNB和 T-eNB双播 /多播发送 UE的数据包。 S-eNB向 T-eNB转发未被 UE确认正确接收的, 或者 S-RN未向 UE发送的由 S-GW单播发送的数据包。 具体实现方式在情况三中已 进行详细描述, 因此不再贅述。
情况八、 由 S-eNB做出 UE切换的决定, UE从 S-RN切换到 S-eNB的 T-RN 如图 9所示, 本发明实施例切换处理方法, 包括:
步骤 901同步骤 601。
902、 源演进基站接收该测量报告后, 根据该测量报告以及其他的无线资 源信息做出切换决定, 选择源演进基站的目标中继节点为目标节点, 并向目 标中继节点发送切换请求。
903、 目标中继节点接收源演进基站发送的切换请求后, 执行准入控制。 如果准入控制结果为允许该用户设备接入, 则目标中继节点向源演进基站发 送切换请求确认。
904、 源演进基站接收该切换请求确认后, 根据该切换请求确认确定允许 所述用户设备接入。 源演进基站停止清除緩存中所述用户设备的数据包, 并 且停止向所述 S-eNB发送所述用户设备的数据包。
在情况八中, S-eNB至少可以在以下几种时刻停止向 S-RN发送所述 UE的 数据包:
当 S-eNB向 S-RN发送切换命令后即停止向 S-RN发送该 UE的数据包。 或者 S-eNB也可以在比向 S-RN发送切换命令的时刻提前或滞后一段时间 T时停止向 S-RN发送该 UE的数据包。
或者也可以是 S-RN发送切换命令时, S-RN即可以将第一个从 S-eNB新接 收的但是还没有向 UE发送的数据包的序列号发送给 S-eNB; 当 S-eNB接收到 该序列号信息时, 即停止向 S-RN发送 UE的数据包。
或者 S-RN可以直接向 S-eNB发送一个停止传输请求消息, 请求 S-eNB停 止向 S-RN传输该 UE的数据。 当 S-eNB接收到该消息后即停止传输该 UE的数 据给 S-RN。
或者也可以是 S-eNB向 S-RN发送一个停止传输请求消息, 然后 S-RN向 S-eNB发送一个确认消息, 当 S-eNB接收到该确认消息后即停止向 S-RN发送 该 UE的数据包。
或者也可以是当 S-eNB接收到后述 S-RN发送的 UE的接收状态报告时停 止向 S-RN发送该 UE的数据包。
步骤 905 ~ 906同步骤 603 ~ 604。
步骤 907 ~ 910同步骤 508 ~ 511。
本发明实施例提供的切换处理方法, 通过源演进基站在确定用户设备需 要切换时, 或者在确定所述用户设备需要切换后的指定时刻, 停止清除緩存 中被源中继节点接收的所述用户设备的数据包, 并从源中继节点获取所述用 户设备的接收状态信息, 在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态信息从所述源中继节点获取丟失的数据包, 降低切换过程 中源演进基站丟失数据包的可能, 减少源中继节点回传给源演进基站的已清 除数据包数量, 节约无线资源。
另外, 在处于情况三、 情况七下, 通过源演进基站或目标演进基站请求 S-GW双播 /多播发送当前的用户设备的数据包, 使目标演进基站可以直接从 S-GW接收当前的用户设备的数据包, 将该数据包转发给目标中继节点, 不仅 减小了数据传输的时延, 还使目标演进基站更容易对数据包进行排序。
与上述方法相应地, 本发明实施例还提供了一种切换处理方法, 如图 13 所示, 本发明实施例切换处理方法, 包括:
1301、 源中继节点向源演进基站发送用户设备的接收状态信息;
1302、 源中继节点在接收由所述源演进基站发送的丟包消息时, 根据所 述丟包消息向所述源演进基站发送丟失的数据包。
本发明实施例提供的切换处理方法, 源中继节点将用户设备的接收状态 信息发送给源演进基站, 使源演进基站在停止清除緩存中所述用户设备的数 据包后, 可以根据用户设备的接收状态信息确定是否存在丟失数据包, 源中 继节点根据源演进基站发送的丟包消息向源演进基站发送数据包, 降低切换 过程中源演进基站丟失数据包的可能, 减少源中继节点回传给源演进基站的 已清除数据包数量, 节约无线资源。
与上述方法相对应地, 本发明提供了一种基站, 如图 14所示, 本发明实 施例基站, 包括:
切换确定单元 1401 , 用于确定用户设备是否需要切换;
停止清除单元 1402 ,用于在所述切换确定单元 1401确定所述用户设备需 要切换时, 或在所述切换确定单元 1401确定所述用户设备需要切换后的指定 时刻, 停止清除緩存中所述用户设备的数据包;
信息获取单元 1403 , 用于从源中继节点获取所述用户设备的接收状态信 息;
丟失数据确定单元 1404 ,用于根据所述信息获取单元 1403获取的接收状 态信息确定是否存在丟失的数据包;
丟失数据获取单元 1405 ,用于在所述丟失数据确定单元 1404确定存在丟 失的数据包时, 根据所述信息获取单元 1403获取的接收状态信息从所述源中 继节点获取所述丟失的数据包。
进一步地, 所述切换确定单元 1401具体包括:
切换请求接收子单元, 用于接收由所述源中继节点发送的切换请求; 切换请求判断子单元, 用于根据所述切换请求接收子单元接收的切换请 求确定所述用户设备需要切换;
或者, 所述切换确定单元 1401具体包括:
测量报告接收子单元, 用于接收由所述源中继节点发送的所述用户设备 的测量报告;
测量报告判断子单元, 用于根据所述测量报告接收子单元接收的测量报 告确定所述用户设备需要切换。
进一步地, 所述信息获取单元 1403包括:
状态报告接收子单元, 用于接收由所述源中继节点发送的接收状态报告; 状态信息获取子单元, 用于从所述状态报告接收子单元接收的接收状态 报告中获取所述用户设备的接收状态信息。
进一步地, 所述丟失数据获取单元 1405包括:
丟失数据确定子单元, 用于根据所述接收状态信息确定丟失的数据包;
丟包消息发送子单元, 用于向所述源中继节点发送丟包消息, 所述丟包 消息携带所述丟失数据确定子单元确定的丟失的数据包的序列号;
丟失数据接收子单元, 用于接收由所述源中继节点发送的所述丟失的数 据包。
进一步地, 所述基站还包括:
多余数据确定单元, 用于根据所述信息获取单元获取的接收状态信息确 定是否存在多余的数据包;
緩存清除单元, 用于在所述多余数据确定单元确定存在多余的数据包时, 根据所述信息获取单元获取的接收状态信息清除緩存中所述多余的数据包。
进一步地, 所述基站还包括:
数据传输单元, 用于根据所述信息获取单元获取的接收状态信息向目标 节点发送所述用户设备的数据包;
状态消息发送单元, 用于根据所述信息获取单元获取的接收状态信息向 所述目标节点发送所述用户设备的接收状态消息。
进一步地, 所述基站还包括传输请求接收单元, 用于接收由所述目标节 点发送的数据传输请求。 所述基站的数据传输单元和状态消息发送单元可以 根据所述传输请求接收单元接收的数据传输请求, 分别向目标节点发送所述 用户设备的数据包以及所述用户设备的接收状态消息。
进一步地, 所述数据传输单元具体包括:
单播数据确定子单元, 用于根据双播 /多播标志确定单播发送数据包; 传输数据子单元, 用于根据所述信息获取单元获取的接收状态信息向所 述目标节点发送未被所述用户设备确认正确接收或未向所述用户设备发送的 单播发送数据包。
进一步地, 所述基站还包括:
发送请求发送单元, 用于通过移动性管理实体向服务网关发送双播 /多播 请求, 所述双播 /多播请求用于请求所述服务网关向目标演进基站和源演进基
站双播 /多播发送数据包;
发送确认接收单元, 用于接收由所述移动性管理实体转发的双播 /多播请 求确认;
新数据接收单元, 用于接收由所述服务网关双播 /多播发送的数据包。 本发明实施例提供的基站, 通过在确定用户设备需要切换时, 或者在确 定所述用户设备需要切换后的指定时刻, 停止清除緩存中被源中继节点接收 的所述用户设备的数据包, 并从源中继节点获取所述用户设备的接收状态信 息, 在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态 信息从所述源中继节点获取丟失的数据包, 降低切换过程中源演进基站丟失 数据包的可能, 减少源中继节点回传给源演进基站的已清除数据包数量, 节 约无线资源。
与上述装置相对应地, 本发明实施例还提供了一种中继节点, 如图 15所 示, 本发明实施例中继节点, 包括:
状态信息发送单元 1501 , 用于向源演进基站发送用户设备的接收状态信 息;
丟包消息接收单元 1502 , 用于接收由所述源演进基站发送的丟包消息; 丟失数据发送单元 1503 ,用于在所述丟包消息接收单元 1502接收丟包消 息时, 根据所述丟包消息向所述源演进基站发送丟失的数据包。
进一步地, 所述中继节点还包括:
切换请求发送单元, 用于向所述源演进基站发送切换请求;
指示消息发送单元, 用于向所述源演进基站发送切换指示消息; 切换确认接收单元, 用于接收由所述源演进基站发送的切换请求确认。 或者, 所述中继节点还包括:
测量报告发送单元, 用于向所述源演进基站发送所述用户设备的测量报 告.
切换命令接收单元, 用于接收由所述源演进基站发送的切换命令。
进一步地, 所述丟失数据发送单元 1503具体还包括:
序号获取子单元, 用于从所述丟包消息接收子单元接收的丟包消息中获 取丟失的数据包的序列号;
丟失数据发送子单元, 用于根据所述序号获取子单元获取的序列号向所 述源演进基站发送所述丟失的数据包。
本发明实施例提供的中继节点, 将用户设备的接收状态信息发送给源演 进基站, 使源演进基站在停止清除緩存中所述用户设备的数据包后, 可以根 据用户设备的接收状态信息确定是否存在丟失数据包, 所述中继节点根据源 演进基站发送的丟包消息向源演进基站发送数据包, 降低切换过程中源演进 基站丟失数据包的可能, 减少源中继节点回传给源演进基站的已清除数据包 数量, 节约无线资源。
与上述方法、 装置相对应地, 本发明实施例还提供了一种切换处理系统, 如图 16所示, 本发明实施例切换处理系统, 包括演进基站和中继节点: 所述 演进基站与至少一个中继节点连接; 所述演进基站包括源演进基站 1602和目 标演进基站 1603; 所述中继节点包括源中继节点 1601和目标中继节点 1604 ; 其中, 所述源演进基站 1602 , 用于在确定用户设备需要切换时, 或者在 确定所述用户设备需要切换后的指定时刻, 停止清除緩存中所述用户设备的 数据包; 并从所述源中继节点 1601获取所述用户设备的接收状态信息; 在根 据所述接收状态信息确定存在丟失的数据包时, 根据接收状态信息从所述源 中继节点 1601获取所述丟失的数据包;
所述源中继节点 1601 ,用于向源演进基站 1602发送用户设备的接收状态 信息; 并根据所述源演进基站 1602的丟包消息向所述源演进基站 1602发送 丟失的数据包。
进一步地, 所述源演进基站 1602 , 还用于根据所述接收状态信息向所述 目标演进基站 1603或所述目标中继节点 1604发送所述用户设备的数据包和 / 或所述用户设备的接收状态消息;
所述目标演进基站 1603 ,用于接收由所述源演进基站 1602发送的所述用 户设备的数据包和 /或所述用户设备的接收状态消息;
所述目标中继节点 1604 ,用于接收由所述源演进基站 1603发送的所述用 户设备的数据包和 /或所述用户设备的接收状态消息。
本发明实施例提供的切换处理系统, 通过源演进基站在确定用户设备需 要切换时, 或者在确定所述用户设备需要切换后的指定时刻, 停止清除緩存 中被源中继节点接收的所述用户设备的数据包, 并从源中继节点获取所述用 户设备的接收状态信息, 在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态信息从所述源中继节点获取丟失的数据包, 降低切换过程 中源演进基站丟失数据包的可能, 减少源中继节点回传给源演进基站的已清 除数据包数量, 节约无线资源。
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流 程, 是可以通过计算机程序来指令相关的硬件来完成, 所述的程序可存储于 一计算机可读取存储介质中, 该程序在执行时, 可包括如上述各方法的实施 例的流程。其中,所述的存储介质可为磁碟、光盘、只读存储记忆体( Read-Only Memory, ROM )或随机存储记忆体 ( Random Acces s Memory, RAM )等。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应以权利要求的保护范围为准。
Claims
1、 一种切换处理方法, 其特征在于, 包括:
在确定用户设备需要切换时, 或在确定所述用户设备需要切换后的指定时 刻, 停止清除緩存中所述用户设备的数据包;
从源中继节点获取所述用户设备的接收状态信息;
在根据所述接收状态信息确定存在丟失的数据包时, 根据所述接收状态信 息从所述源中继节点获取所述丟失的数据包。
2、 根据权利要求 1所述的切换处理方法, 其特征在于, 确定所述用户设备 需要切换包括:
接收由所述源中继节点发送的切换请求, 并根据所述切换请求确定所述用 户设备需要切换; 或者,
接收由所述源中继节点发送的所述用户设备的测量报告, 并根据所述测量 报告确定所述用户设备需要切换。
3、 根据权利要求 1所述的切换处理方法, 其特征在于, 所述确定所述用户 设备需要切换后的指定时刻为:
确定所述用户设备需要切换的时刻到确定所述用户设备被允许切换的时刻 之间的任一时刻, 或者, 确定所述用户设备被允许切换的时刻, 或者, 确定所 述用户设备需要切换的时刻到停止向所述源中继节点发送所述用户设备的数据 包的时刻之间的任一时刻, 或者, 停止向所述源中继节点发送所述用户设备的 数据包的时刻;
所述停止向所述源中继节点发送所述用户设备的数据包的时刻为: 确定所述用户设备被允许切换的时刻, 或者, 向所述源中继节点发送切换 请求确认或切换命令的时刻, 或者, 确定所述用户设备被允许切换的时刻到向 所述源中继节点发送切换请求确认或切换命令的时刻之间的时刻, 或者, 接收 所述接收状态报告的时刻; 或者, 向所述源中继节点发送切换请求确认或切换 命令的时刻到接收所述接收状态报告的时刻之间的时刻。
4、 根据权利要求 3所述的切换处理方法, 其特征在于, 确定所述用户设备 被允许切换包括:
根据执行的准入控制结果确定所述用户设备被允许切换; 或者,
接收由目标节点发送的切换请求确认, 并根据所述切换请求确认确定所述 用户设备被允许切换; 或者,
接收由所述源中继节点发送的切换指示消息, 并根据所述切换指示消息确 定所述用户设备被允许切换。
5、 根据权利要求 1所述的切换处理方法, 其特征在于, 所述从所述源中继 节点获取所述用户设备的接收状态信息包括:
接收由所述源中继节点发送的接收状态报告;
从所述接收状态报告中获取所述用户设备的接收状态信息。
6、 根据权利要求 1所述的切换处理方法, 其特征在于, 所述根据所述接收 状态信息从所述源中继节点获取所述丟失的数据包包括:
根据所述接收状态信息确定丟失的数据包;
向所述源中继节点发送丟包消息 , 所述丟包消息携带所述确定的丟失的数 据包的序列号;
接收由所述源中继节点发送的所述丟失的数据包。
7、 根据权利要求 1或 2或 3或 6或 7所述的切换处理方法, 其特征在于, 所述接收状态信息包括:
所述源中继节点最后发送的一个或多个新的数据包的序列号, 和未被所述 用户设备确认正确接收的数据包的序列号; 或者,
所述源中继节点最先未发送的一个或多个新的数据包的序列号, 和未被所 述用户设备确认正确接收的数据包的序列号; 或者,
所述源中继节点最后发送的一个或多个新的数据包的序列号; 或者, 所述源中继节点最先未发送的一个或多个新的数据包的序列号;
所述根据所述接收状态信息确定丟失的数据包包括:
根据所述未被所述用户设备确认正确接收的数据包的序列号以及緩存中所 述用户设备的数据包的序列号, 确定緩存中不存在的未被所述用户设备确认正 确接收的数据包, 将所述确定的未被所述用户设备确认正确接收的数据包作为 丟失的数据包; 或者,
根据所述最后发送的新的数据包的序列号, 以及緩存的所述用户设备的数 据包的序列号, 确定序列号在所述最后发送的新的数据包的序列号与最先緩存 的数据包的序列号之间的数据包, 将所述确定的数据包作为丟失的数据包; 或 者,
根据所述最先未发送的新的数据包的序列号, 以及緩存的所述用户设备的 数据包的序列号, 确定序列号为所述最先未发送的新的数据包的序列号或在所 述最先未发送的新的数据包的序列号与最先緩存的数据包的序列号之间的序列 号的数据包, 将所述确定的数据包作为丟失的数据包。
8、 根据权利要求 1所述的切换处理方法, 其特征在于, 还包括: 在根据所述接收状态信息确定存在多余的数据包时, 根据所述接收状态信 息清除緩存中所述多余的数据包。
9、 根据权利要求 1所述的切换处理方法, 其特征在于, 还包括: 根据所述接收状态信息向所述目标节点发送所述用户设备的数据包和 /或 所述用户设备的接收状态消息, 所述接收状态消息为所述源中继节点发送的所 述用户设备的接收状态报告, 或者, 所述接收状态消息携带所述源中继节点最 后发送的一个或多个新的数据包的序列号或最先未发送的一个或多个新的数据 包的序列号。
10、 根据权利要求 1所述的切换处理方法, 其特征在于, 还包括: 通过移动性管理实体向服务网关发送双播 /多播请求, 所述双播 /多播请求 用于请求所述服务网关向目标演进基站和源演进基站双播 /多播发送数据包; 接收由所述移动性管理实体转发的双播 /多播请求确认;
接收由所述服务网关双播 /多播发送的数据包;
根据双播 /多播标志确定单播发送数据包;
根据所述接收状态信息, 向所述目标节点发送未被所述用户设备确认正确 接收或未向所述用户设备发送的单播发送数据包, 和 /或向所述目标节点发送所 述用户设备的接收状态消息, 所述接收状态消息为所述源中继节点发送的所述 用户设备的接收状态报告, 或者, 所述接收状态消息携带所述源中继节点最后 发送的一个或多个新的数据包的序列号或最先未发送的一个或多个新的数据包 的序列号。
11、 根据权利要求 1 所述的切换处理方法, 其特征在于, 所述数据包为分 制业务数据单元或无线链路控制协议数据单元;
所述数据包的序列号为分组数据汇聚协议业务数据单元序列号或分组数据 汇聚协议协议数据单元序列号或无线链路控制业务数据单元序列号或无线链路 控制协议数据单元序列号。
12、 一种切换处理方法, 其特征在于, 包括:
向源演进基站发送用户设备的接收状态信息;
在接收由所述源演进基站发送的丟包消息时, 根据所述丟包消息向所述源 演进基站发送丟失的数据包。
13、 根据权利要求 12所述的切换处理方法, 其特征在于, 所述向源演进基 站发送用户设备的接收状态信息的步骤之前包括:
向所述源演进基站发送切换请求; 或者,
向所述源演进基站发送切换请求, 在接收由所述源演进基站发送的切换请 求确认后, 向所述源演进基站发送切换指示消息; 或者,
向所述源演进基站发送所述用户设备的测量报告, 并接收由所述源演进基 站发送的切换命令。
14、 根据权利要求 12所述的切换处理方法, 其特征在于, 所述向源演进基 站发送接收状态信息包括:
向所述源演进基站发送接收状态报告, 所述接收状态报告携带所述用户设 备的接收状态信息; 或者,
向所述源演进基站发送切换请求, 所述切换请求消息携带所述用户设备的 接收状态信息。
15、 根据权利要求 12至 14 中任一项所述的切换处理方法, 其特征在于, 所述接收状态信息包括:
所述源中继节点最后发送的一个或多个新的数据包的序列号, 和未被所述 用户设备确认正确接收的数据包的序列号; 或者,
所述源中继节点最先未发送的一个或多个新的数据包的序列号, 和未被所 述用户设备确认正确接收的数据包的序列号; 或者,
所述源中继节点最后发送的一个或多个新的数据包的序列号; 或者, 所述源中继节点最先未发送的一个或多个新的数据包的序列号。
16、 根据权利要求 15所述的切换处理方法, 其特征在于, 所述根据所述丟 包消息向所述源演进基站发送丟失的数据包包括:
从所述丟包消息中获取丟失的数据包的序列号;
根据所述丟失的数据包的序列号向所述源演进基站发送所述丟失的数据 包。
17、 一种基站, 其特征在于, 包括:
切换确定单元, 用于确定用户设备是否需要切换;
停止清除单元, 用于在所述切换确定单元确定所述用户设备需要切换时, 或在所述切换确定单元确定所述用户设备需要切换后的指定时刻, 停止清除緩 存中所述用户设备的数据包;
信息获取单元, 用于从源中继节点获取所述用户设备的接收状态信息; 丟失数据确定单元, 用于根据所述信息获取单元获取的接收状态信息确定 是否存在丟失的数据包;
丟失数据获取单元, 用于在所述丟失数据确定单元
时, 根据所述信息获取单元获取的接收状态信息从所述源中继节点获取所述丟 失的数据包。
18、 根据权利要求 17所述的基站, 其特征在于, 所述切换确定单元包括: 切换请求接收子单元, 用于接收由所述源中继节点发送的切换请求; 切换请求判断子单元, 用于根据所述切换请求接收子单元接收的切换请求 确定所述用户设备需要切换。
19、 根据权利要求 17所述的基站, 其特征在于, 所述切换确定单元包括: 测量报告接收子单元, 用于接收由所述源中继节点发送的所述用户设备的 测量报告;
测量报告判断子单元, 用于根据所述测量报告接收子单元接收的测量报告 确定所述用户设备需要切换。
20、 根据权利要求 17所述的基站, 其特征在于, 所述信息获取单元包括: 状态报告接收子单元, 用于接收由所述源中继节点发送的接收状态报告; 状态信息获取子单元, 用于从所述状态报告接收子单元接收的接收状态报 告中获取所述用户设备的接收状态信息。
21、 根据权利要求 17所述的基站, 其特征在于, 所述丟失数据获取单元包 括:
丟失数据确定子单元, 用于根据所述接收状态信息确定丟失的数据包; 丟包消息发送子单元, 用于向所述源中继节点发送丟包消息, 所述丟包消 息携带所述丟失数据确定子单元确定的丟失的数据包的序列号;
丟失数据接收子单元, 用于接收由所述源中继节点发送的所述丟失的数据 包。
22、 根据权利要求 17所述的基站, 其特征在于, 还包括:
多余数据确定单元, 用于根据所述信息获取单元获取的接收状态信息确定 是否存在多余的数据包;
緩存清除单元, 用于在所述多余数据确定单元确定存在多余的数据包时,
根据所述信息获取单元获取的接收状态信息清除緩存中所述多余的数据包。
23、 根据权利要求 17所述的基站, 其特征在于, 还包括:
数据传输单元, 用于根据所述信息获取单元获取的接收状态信息向目标节 点发送所述用户设备的数据包;
状态消息发送单元, 用于根据所述信息获取单元获取的接收状态信息向所 述目标节点发送所述用户设备的接收状态消息。
24、 根据权利要求 23所述的基站, 其特征在于, 还包括:
发送请求发送单元, 用于通过移动性管理实体向服务网关发送双播 /多播请 求, 所述双播 /多播请求用于请求所述服务网关向目标演进基站和源演进基站双 播 /多播发送数据包;
发送确认接收单元, 用于接收由所述移动性管理实体转发的双播 /多播请求 确认;
新数据接收单元, 用于接收由所述服务网关双播 /多播发送的数据包; 所述数据传输单元包括:
单播数据确定子单元, 用于根据双播 /多播标志确定单播发送数据包; 传输数据子单元, 用于根据所述信息获取单元获取的接收状态信息向所述 目标节点发送未被所述用户设备确认正确接收或未向所述用户设备发送的单播 发送数据包。
25、 一种中继节点, 其特征在于, 包括:
状态信息发送单元, 用于向源演进基站发送用户设备的接收状态信息; 丟包消息接收单元, 用于接收由所述源演进基站发送的丟包消息; 丟失数据发送单元, 用于在所述丟包消息接收单元接收丟包消息时, 根据 所述丟包消息向所述源演进基站发送丟失的数据包。
26、 根据权利要求 25所述的中继节点, 其特征在于, 所述数据发送单元包 括:
序号获取子单元, 用于从所述丟包消息接收单元接收的丟包消息中获取丟 失的数据包的序列号;
丟失数据发送子单元, 用于根据所述序号获取子单元获取的序列号向所述 源演进基站发送所述丟失的数据包。
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| 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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| WO2018210421A1 (en) * | 2017-05-18 | 2018-11-22 | Nokia Technologies Oy | Service continuity in case of nomadic relay's sudden shut-off |
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| 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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| CN102246555B (zh) | 2013-12-04 |
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