WO2008154885A1 - Procédé permettant de répéter un traitement de paquets de données, nœud et dispositif de noyau de paquet - Google Patents

Procédé permettant de répéter un traitement de paquets de données, nœud et dispositif de noyau de paquet Download PDF

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Publication number
WO2008154885A1
WO2008154885A1 PCT/CN2008/071394 CN2008071394W WO2008154885A1 WO 2008154885 A1 WO2008154885 A1 WO 2008154885A1 CN 2008071394 W CN2008071394 W CN 2008071394W WO 2008154885 A1 WO2008154885 A1 WO 2008154885A1
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Prior art keywords
data packet
data packets
node
transmitted
sequence number
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PCT/CN2008/071394
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English (en)
French (fr)
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WO2008154885A8 (fr
Inventor
Xiaofei Ma
Yinghua Huang
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008154885A1 publication Critical patent/WO2008154885A1/zh
Publication of WO2008154885A8 publication Critical patent/WO2008154885A8/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/08Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a data packet forwarding processing method, a node and a packet core device. Background technique
  • LTE Long Term Evolution
  • E-UTRAN Universal Terrestrial Radio Access Network
  • an Evolved Packet Core is divided into a control plane entity (Mobility Management Entity, hereinafter referred to as: E) and User Plane Entity (hereinafter referred to as UPE) System Architecture Evolution Gateway (hereinafter referred to as SAE Gateway), Evolved Node (eNodeB, hereinafter referred to as eNB) is directly connected to EPC, eNB
  • E Mobility Management Entity
  • UPE User Plane Entity
  • SAE Gateway System Architecture Evolution Gateway
  • eNodeB Evolved Node
  • S1 S1 interface between the MME and the SAE Gateway, which is used to implement data transmission and signaling interaction between the eNB and the MME/SAE Gateway.
  • the eNBs are directly connected to each other.
  • An X2 interface exists between the eNBs to implement data forwarding and information exchange between the eNBs.
  • a flow chart of switching the prior art in the LTE system shown in FIG. 1 includes the following steps:
  • Step 200 In the process of establishing a service by the terminal (User Equipment, the following: UE) to establish a service with the network, or in the latest Track Area (TA) update, the terminal context in the source eNB includes the area.
  • the information of the area restriction provided is: Step 201, the source eNB configures measurement control information for the terminal according to the area roaming restriction information, and the measurement control flow provided by the source eNB assists the terminal to perform mobility function control; Article 26)
  • Step 202 The terminal reports a measurement report to the source eNB according to a preset rule.
  • Step 203 The source eNB determines the terminal decision (HO decision) based on the measurement information of the terminal and the radio resource management information.
  • Step 204 The source eNB sends a handover request message to the target eNB, and informs the target eNB of the necessary handover preparation information (Handover request), including the radio resource.
  • the X2 interface of the target eNB and the S1 interface signaling reference ensure that the target eNB can locate the source eNB.
  • Step 205 The target eNB performs admission control according to the quality of service (Quality of Service, Qos) information of the received SAE bearer, in order to improve the handover success rate, if the target eNB can accept the terminal,
  • the switching configures the requested radio resource and reserves a Cell Radio Network Temporary Identity (C-RNTI);
  • C-RNTI Cell Radio Network Temporary Identity
  • Step 206 The target eNB prepares a handover and sends a handover request response message (Handover Request ack) to the source eNB, where the reserved C-RNTI may further include an access parameter, system information, and a wireless network layer/transport network layer that forwards the tunnel. (Radio Network Layer/ Transport Network Layer, the following cartridge: RNL/TNL) and other information;
  • Step 207 The source eNB sends a handover command message (Handover command) to the terminal, where the information carried in the handover request response message sent by the target eNB is performed, and the source eNB performs necessary integrity protection and encryption for the message.
  • a handover command message (Handover command)
  • Step 208 The terminal initiates synchronization to the target eNB and acquires uplink synchronization time advance (Synchronization) from the target eNB.
  • Synchronization uplink synchronization time advance
  • Step 209 The target eNB responds to uplink allocation and uplink synchronization time advancement (UL allocation + TA for UE);
  • Step 210 The terminal accesses the target eNB cell, and after successful access, sends a handover acknowledgement message to the target eNB, and informs the target eNB that the handover process is completed.
  • the target eNB sends a handover complete confirmation message (Handover complete) to the EPC. Notifying the EPC terminal that the cell has been replaced, so that the UPE switches the downlink data path to the target side and releases the user plane and transport layer network resources to the source end;
  • Step 212 The EPC sends a response message (Handover complete ack) of the handover complete confirmation message to the target eNB.
  • Step 213 The target eNB sends a release resource message (Re 1 ea s e s ou r c e ) to the source eNB, informing the source eNB that the handover succeeds and triggering resource release.
  • a release resource message (Re 1 ea s e s ou r c e )
  • Step 214 After receiving the resource release message, the source eNB releases the radio resource and control area resource (Re lease source) related to the terminal context.
  • the downlink data is transmitted between the source eNB and the target eNB by means of data forwarding, that is, when the handover is performed, the source eNB will not respond to all the terminals.
  • the downlink service data unit (Service Da ta Uni t, hereinafter referred to as SDU) packet is forwarded to the target eNB.
  • the requirements proposed in the radio access network (Radio Acces s Network, RAN for short) LTE project are:
  • the inter-eNB user plane handover scheme needs to minimize the loss, repetition, out-of-order transmission and interruption time of downlink data packets, in order to satisfy
  • the target eNB needs to preferentially process the SDU data packet forwarded from the source eNB, and after processing the SDU data packet forwarded by the source eNB, process the SDU data packet received from the S1 port.
  • the prior art sets a timer in the target eNB, and sets the duration of the timer in the handover process.
  • the source eNB is fully considered.
  • the data forwarding of the eNB is not completed.
  • the timer expires, the data forwarding of the source eNB to the target eNB is considered complete, and the target eNB may turn to processing the data packet sent from the S1 interface.
  • the inventors have found that the prior art has the following problems when ensuring that the target eNB preferentially processes SDU packets forwarded from the source eNB:
  • the duration of the timer is set based on the artificial estimation and prediction, and the source eNB cannot be replaced with the target eNB.
  • the actual time required to send a packet matches. To prevent packet loss, it is usually based on the worst transmission condition setting, which is usually set longer.
  • the duration of the set timer is usually longer than the actual required time.
  • the technical problem to be solved by the embodiment of the present invention is: ensuring that the target node finishes receiving the data packet forwarded by the source node in time after processing the data packet forwarded from the source node.
  • the embodiment of the present invention provides a data packet forwarding processing method, including the following steps: The target node detects whether the source node forwards all pending data packets, and when the target node detects that the source node forwards all pending data. At the time of the packet, the reception processing of the data packet forwarded by the source node is ended.
  • An embodiment of the present invention provides a node, including:
  • the information processing module is configured to collect the number of the data packets to be transmitted or the maximum sequence number, or generate a status bitmap of the to-be-transmitted data packet or a notification message that the data packet to be transmitted is forwarded, or generate a packet carrying the last packet identifier or the forwarding end identifier. data pack;
  • a sending module configured to send, to other nodes, the number or maximum sequence number of the to-be-transmitted data packets, or the status bitmap generated by the information processing module or the completed notification message, or the information The data packet generated by the processing module carrying the last packet identifier or the forwarding end identifier.
  • An embodiment of the present invention provides another node, including:
  • a receiving module configured to receive a number of data packets or a maximum sequence number or status bit forwarded by other nodes Figure, or a notification message that the data packet to be forwarded is completed, or a data packet carrying the last packet identifier or the forwarding end identifier;
  • the determining module is configured to determine, according to the number of the to-be-transmitted data packets or the maximum sequence number or status bitmap received by the receiving module, or the forwarded notification message, or the data packet carrying the last packet identifier or the forwarding end identifier, to determine whether to receive All the data that needs to be forwarded by the source node is completed, and the result of the judgment is output;
  • the indication module is configured to: after receiving, according to the judgment result of the determining module, the receiving module, after receiving all the data packets to be transmitted, instructing the receiving module to end the The receiving process of the data packet forwarded by the source node.
  • the embodiment of the invention provides a packet core device, including:
  • a collecting module configured to collect a maximum sequence number of the data packet sent to the source node or a sequence number of the first data packet sent to the target node;
  • a sending module configured to send a data packet to the source node, and send the maximum sequence number of the data packet sent by the notification node to the source node or the first data packet sent to the target node The serial number is sent to the target node.
  • the target node detects whether the data packets to be transmitted in all the source eNBs are received, and the target eNB detects that the data packets to be transmitted in all the source nodes are received, and immediately terminates the waiting for the data packet to be received by the source node.
  • Figure 1 is a schematic diagram of the structure of the existing LTE system
  • Replacement page (Article 26) 2 is a flow chart of a prior art handover in the LTE system shown in FIG. 1;
  • FIG. 3 is a flowchart of a first embodiment of a data packet forwarding processing method according to the present invention
  • FIG. 4 is a flowchart of a second embodiment of a data packet forwarding processing method according to the present invention
  • FIG. 6 is a flowchart of a fourth embodiment of a data packet forwarding processing method according to the present invention
  • FIG. 7 is a flowchart of a fifth embodiment of a data packet forwarding processing method according to the present invention
  • FIG. 9 is a flowchart of a seventh embodiment of a data packet forwarding processing method according to the present invention
  • FIG. 10 is a schematic diagram of an embodiment of a status bitmap of a data packet according to the present invention; ;
  • FIG. 11 is a flowchart of a ninth embodiment of a method for forwarding a data packet according to the present invention
  • FIG. 12 is a flowchart of a ninth embodiment of a method for forwarding a data packet according to the present invention
  • FIG. 14 is a schematic structural diagram of a second embodiment of an eNB according to the present invention.
  • FIG. 15 is a schematic structural diagram of a third embodiment of an eNB according to the present invention.
  • FIG. 16 is a schematic structural diagram of a fourth embodiment of an eNB according to the present invention.
  • FIG. 17 is a schematic structural diagram of a fifth embodiment of an eNB according to the present invention.
  • FIG. 18 is a schematic structural diagram of a sixth embodiment of an eNB according to the present invention.
  • FIG. 19 is a schematic structural diagram of an embodiment of an EPC according to the present invention.
  • FIG. 20 is a schematic structural diagram of a first embodiment of a data packet forwarding processing system according to the present invention.
  • FIG. 21 is a schematic structural diagram of a second embodiment of a data packet forwarding processing system according to the present invention.
  • FIG. 3 it is a flowchart of a first embodiment of a method for forwarding a data packet according to the present invention.
  • the embodiment includes the following steps:
  • Step 301 During the handover process of the terminal, the source eNB collects the number of data packets that are not responded by the terminal, and the data packet that is not responded by the terminal, that is, the data packet to be transmitted, needs to be forwarded to the target eNB, and the number is assumed to be M, M. An integer not less than zero may be taken.
  • the source eNB sends the number M of data packets that need to be forwarded to the target eNB to the target eNB.
  • the source eNB may send the number M of the to-be-transmitted data packets to the target eNB by using a separate message, or may send the number M to the target eNB in the signaling message on the X2 interface, and may also carry the source data in the source eNB.
  • the eNB sends the data packet forwarded to the target eNB through the X2 interface to the target eNB.
  • Step 303 The target eNB receives the number M of the data packets to be received, and determines whether the M is greater than zero, that is, whether there is a data packet that needs to be forwarded by the source eNB. If the value is greater than zero, step 304 is performed. Otherwise, step 308 is performed.
  • Step 304 The target eNB stores the number M of data packets to be received, and receives the data packet forwarded by the source eNB.
  • Step 305 After receiving the data packet forwarded by the source eNB, the target eNB updates the stored number of data packets to be received according to the number of received data packets, and receives N data packets forwarded by the source eNB. , the number of stored data packets is reduced by N, where N is an integer not less than one.
  • the number M of data packets to be received stored in the target eNB dynamically changes due to being updated. After the number M of stored data packets is updated for the first time, the number of stored data packets to be received becomes MN, and then the basis of the MN. Updated on.
  • Step 306 After the target eNB reduces the number of data packets by N, it is determined whether the number of updated data packets to be received is greater than zero, that is, whether all data packets that need to be forwarded by the source eNB are not received, and Go to step 307, otherwise, go to step 308.
  • Step 307 The target eNB waits to receive the data packet forwarded by the source eNB, and then performs the step. 305.
  • Step 308 The target eNB ends the process of waiting for the forwarding of the data packet to the source eNB, so as to timely process the data packet sent by the EPC through the S1.
  • step 302 after the source eNB sends the number M of data packets that need to be forwarded to the target eNB to the target eNB, the source eNB receives the response information of the data packet that needs to be forwarded to the target eNB, and further responds according to the terminal.
  • the information updates the number of data packets that need to be forwarded to the target eNB and notifies the target eNB in time.
  • the target eNB updates the stored number of data packets to be received according to the notification message of the source eNB.
  • FIG. 4 it is a flowchart of a second embodiment of a method for forwarding a data packet according to the present invention.
  • the source eNB carries the number of data packets that need to be forwarded to the target eNB in the data packet, through the X2 interface.
  • the method is sent to the target eNB, and the embodiment includes the following steps:
  • Step 401 During the handover process of the terminal, the source eNB collects the number of data packets that are not responded by the terminal, and the data packet that is not responded by the terminal needs to be forwarded to the target eNB, and the number is M, and the M may take an integer not less than zero. .
  • Step 402 The source eNB writes the number M of data packets that need to be forwarded to the target eNB into the data packet to be forwarded to the target eNB, and sends the data packet to the target eNB.
  • each of the data packets that need to be forwarded to the target eNB may be written according to a predetermined specification, or may be written into the first data packet to be forwarded to the target eNB.
  • the number of data packets that need to be forwarded to the target eNB is written into the first data packet, which can occupy less system resources of the source eNB, saving time and improving work efficiency.
  • the following is an example in which only the number of data packets that need to be forwarded to the target eNB is written in the first data packet.
  • Step 403 The target eNB receives the first data packet forwarded from the source eNB, and obtains the number M of data packets to be received therefrom. Since the first data packet has been received, the number M of data packets to be received is decreased. 1 , ie: The number of data packets to be received in the future is Ml.
  • Step 404 The target eNB determines whether M-1 is greater than zero, that is, whether there is still a data packet that needs to be forwarded by the source eNB. If it is greater than zero, step 405 is performed; otherwise, step 4 0 9 is performed .
  • Step 406 After receiving the data packet forwarded by the source eNB, the target eNB updates the stored number of data packets to be received M-1 according to the number of received data packets, and receives N forwarded by the source eNB.
  • the data packet reduces the number of stored data packets by N, where N is an integer not less than one.
  • the number M-1 of data packets to be received stored in the target eNB dynamically changes due to being updated. After the number of stored data packets M-1 is updated for the first time, the number of stored data packets to be received becomes M-N. - 1 , then updated on the basis of MN-1.
  • Step 407 After the target eNB reduces the number of data packets by N, it is determined whether the number of updated data packets to be received is greater than zero, that is, whether all data packets that need to be forwarded by the source eNB are not received, and if so, Then, step 408 is performed; otherwise, step 409 is performed.
  • Step 408 The target eNB waits to receive the data packet forwarded by the source eNB, and then performs the step.
  • Step 409 The target eNB ends the process of waiting for the forwarding of the data packet to the source eNB, so as to timely process the data packet sent by the EPC through the S1.
  • the source eNB when the source eNB notifies the target eNB of the number of data packets to be transmitted, if the number of data packets to be forwarded to the target eNB decreases due to the response of the terminal during the process of forwarding the data packet, the source After the eNB updates the remaining number of data packets to be forwarded to the target eNB, the eNB may carry the updated data packet in the next data packet to be forwarded to the target eNB, or may carry the update in all data packets that are forwarded later.
  • the number of the subsequent data packets may also be sent to the target eNB by using a separate message to send the number of the updated data packets to the target eNB, or the number of the updated data packets may be carried in the signaling message on the X2 interface and sent to the target eNB.
  • FIG. 5 it is a flowchart of a third embodiment of a method for forwarding a data packet according to the present invention.
  • the embodiment includes the following steps:
  • Step 501 The target eNB receives the first data packet sent by the EPC through the SI interface, and obtains the sequence number of the data packet by parsing. If the sequence number of the data packet sent by the EPC is an explicit sequence number, no resolution is needed, and the sequence number is assumed to be M+l.
  • Step 502 The target eNB receives the data packet forwarded by the source eNB, and obtains the sequence number of the data packet.
  • Step 503 If the source eNB forwards the data packet according to the sequence number of the data packet, the target eNB determines whether the sequence number of the currently received data packet is M, that is, whether all the data packets that need to be forwarded by the source eNB are not received, and if so, Then, step 504 is performed; otherwise, step 505 is performed.
  • the source eNB forwards the data packet according to the sequence number of the data packet, and preferentially transmits the low-order data packet.
  • the sequence number is M. Packet.
  • Step 504 The target eNB waits to receive the data packet forwarded by the source eNB, and then performs step 502.
  • Step 505 The target eNB ends the process of waiting for the forwarding of the data packet to the source eNB, so as to turn to the data packet sent by the EPC through the S1 interface.
  • the EPC may also notify the target eNB of the sequence number M of the last data packet sent by the target eNB to the source eNB (step 601); or, the source eNB may also notify the EPC.
  • the serial number M of the last packet sent to itself (step 7 01).
  • FIG. 6 and FIG. 7 the flowcharts of the fourth and fifth embodiments of the packet processing method of the present invention after replacing step 501 with steps 601 and 701, respectively.
  • FIG. 5 to FIG. 7 are applicable to the case where the source eNB forwards the data packet to the target eNB according to the sequence number of the data packet, and the source eNB does not forward the data packet to the target eNB according to the sequence number of the data packet, as shown in the figure.
  • 8 is a flowchart of a sixth embodiment of a method for forwarding a data packet according to the present invention. The embodiment includes the following steps:
  • Step 801 In the process of the handover by the terminal, the source eNB acquires the smallest sequence number of all the data packets not responded by the terminal, and notifies the target eNB, assuming that the minimum sequence number is A, and A is not less than the replacement page (1 ⁇ 4 26) An integer of zero.
  • the source eNB may notify the target eNB of the smallest sequence number by using a separate message, or may send the smallest sequence number to the target eNB in the signaling message on the X2 interface, and may also carry the The source eNB sends the first data packet forwarded to the target eNB through the X2 interface to the target eNB.
  • Step 801 ′ the target eNB receives the first data packet sent by the EPC through the S1 interface, and obtains the sequence number M+1 of the data packet by parsing; or, the EPC notifies the target eNB of the last data packet sent by the target eNB to the source eNB.
  • the serial number M; or, the source eNB notifies the EPC of the sequence number of the last data packet sent to itself ⁇
  • Step 802 The target eNB receives the data packet forwarded by the source eNB, obtains the sequence number of the data packet, and stores the data packet.
  • Step 803 The target eNB determines, according to the sequence number of the stored data packet, whether all the data packets of the sequence number from A to M are received, that is, whether all the data packets that need to be forwarded by the source eNB are received, and if yes, the step is performed. 805; Otherwise, step 804 is performed.
  • the target eNB When the target eNB receives all the data packets of the sequence number from A to M forwarded from the source eNB, it is considered that all the packets that need to be forwarded by the source eNB have been received.
  • Step 804 the target eNB waits to receive the data packet forwarded by the source eNB, and then performs step 802.
  • Step 805 The target eNB ends the process of waiting for the forwarding of the data packet by the source eNB, so as to turn to the data packet sent by the EPC through the S1 interface.
  • step 801' may also be performed prior to step 801 or concurrently with step 801.
  • FIG. 9 it is a flowchart of a seventh embodiment of a method for forwarding a data packet according to the present invention.
  • the embodiment includes the following steps:
  • Step 901 In the process of the handover by the terminal, the source eNB generates a state bitmap of the data packet that needs to be forwarded to the target eNB according to the sequence number of the data packet that is not responded by the terminal.
  • FIG. 10 it is a schematic diagram of an embodiment of a status bitmap of a data packet that needs to be forwarded to a target eNB according to the present invention.
  • the figure shows the forwarding status of 10 data packets, for example: "1" is used to identify the data.
  • the packet needs to be forwarded. If the data packet does not need to be forwarded with "0", then according to the status bitmap, the first, third, fifth and sixth data packets from the starting position need to be forwarded by the source eNB to the target eNB. Whether the identifier of the data packet needs to be forwarded may be set in the source eNB and the target eNB in advance.
  • Step 902 The source eNB sends a status bitmap of the data packet that needs to be forwarded to the target eNB to the target eNB.
  • the source eNB may send the status bitmap to the target eNB through a separate message, or may send the status bitmap to the target eNB in a signaling message on the X2 interface, and may also carry the same.
  • the first eNB forwards the source eNB to the target eNB through the X2 interface to the target eNB.
  • Step 903 The target eNB stores the status bitmap, and receives the data packet forwarded by the source eNB.
  • the target eNB may compare the number of data packets forwarded by the source eNB with the number of status bits identified as "1" in the status bitmap, and the number of data packets forwarded by the source eNB and the status bitmap are identified as When the number of status bits of ⁇ is equal, all the data packets that need to be forwarded by the source eNB are received.
  • the sequence number of the data packet corresponding to each identifier and the data packet to be forwarded are If the sequence numbers are the same, in step 902, when the source eNB sends the status bitmap to the target eNB, the sequence number of the data packet corresponding to the first identifier in the status bitmap is also sent, for example: 88002, specifically, the status may be The bitmap separately sends the sequence number of the data packet corresponding to the first identifier, and may also be sent in the status bitmap, so that the source eNB according to the sequence number corresponding to the first identifier in the status bitmap, and the need By forwarding the location relationship between the identifier of the data packet and the first identifier, the sequence number of the data packet to be transmitted is obtained, and the target eNB compares the data forwarded by the source eNB. The number and a status bitmap, can know whether the received data packet forwarded by the source eNB is completed.
  • the sequence number of the data packet needs to be transmitted on the X2 interface.
  • the cut number of the low bit is taken, for example: taking the lower 8 bits of the sequence number of the actual data packet, and the target eNB correspondingly adopts the corresponding low bit cut sequence number when matching the status bitmap and the sequence number of the data packet.
  • Step 905 The target eNB waits to receive the data packet forwarded by the source eNB, and then performs an operation of receiving the data packet forwarded by the source eNB in step 903.
  • Step 906 The target eNB ends the process of waiting for the forwarding of the data packet by the source eNB, so as to turn to the data packet sent by the EPC through the S1 interface.
  • FIG. 11 it is a flowchart of an eighth embodiment of a method for forwarding a data packet according to the present invention.
  • the embodiment includes the following steps:
  • Step 11 01 When the source eNB forwards the last data packet that is not responded by the terminal to the target eNB, set a last packet identifier or a forwarding end identifier in the data packet, and notify the target eNB that the data packet needs to be forwarded to the target eNB. The last packet is forwarded to the target eNB.
  • Step 11 02 When receiving the data packet carrying the last packet identifier or the forwarding end identifier forwarded by the source eNB, the target eNB learns that the data packet is forwarded according to the last packet identifier or the forwarding end identifier in the data packet.
  • Step 11 0 3 the target eNB ends the process of waiting for the forwarding of the data packet to the source eNB, so as to turn to the data packet sent by the EPC through the S1 interface in time.
  • FIG. 12 it is a flowchart of a ninth embodiment of a method for forwarding a data packet according to the present invention.
  • the embodiment includes the following steps:
  • Step 12 01 The source eNB forwards the last data packet to the target eNB to the target eNB. Sending a notification message that the packet has been forwarded; or sending a packet to the target eNB after sending a packet to the target eNB.
  • Step 1202 The target eNB receives the notification message that the data packet sent by the source eNB is forwarded, and learns that the data packet is forwarded.
  • Step 1203 The target eNB ends the process of waiting for the forwarding of the data packet to the source eNB, so as to turn to the data packet sent by the EPC through the S1 interface.
  • the source eNB finds that there is no data packet that is not responded by the terminal, that is, when there is no data packet that needs to be forwarded to the target eNB, the presence and the pending transmission are sent to the target eNB.
  • the notification message of the data packet avoids the unnecessary waiting of the target eNB when receiving the data packet on the 11 interface, which saves the time taken by the target eNB to receive the data packet on the interface.
  • the target eNB learns the sequence number or status bitmap that needs to be received
  • the source eNB receives the response information of the data packet that needs to be forwarded to the target eNB
  • the source eNB further The response information of the terminal notifies the target eNB of the number of data packets or sequence numbers that need to be received again.
  • the target eNB updates the sequence number or status bitmap of the data packet to be received according to the notification message of the source eNB.
  • the target eNB may be prevented from being in an unnecessary null state due to a link failure between the source eNB and the target eNB, and a timer may be set in the target eNB and the preset may be set. The maximum time allowed for the secondary handover.
  • the start timer starts counting.
  • the target eNB does not wait to receive the data packet forwarded by the source eNB, and immediately switches to the data packet sent by the EPC through the S1 interface.
  • FIG. 13 is a schematic structural diagram of a first embodiment of an eNB according to the present invention, which is provided by the embodiment.
  • the eNB can be used as a source eNB for implementing the forwarding processing method terminal of the foregoing data packet of the present invention, and includes an information processing module 1301 and a transmitting module 1302 that are connected to each other.
  • the information processing module 1301 is configured to count the number or maximum sequence number of the data packets that need to be forwarded to the target eNB in the current handover, or generate a status of the to-be-transmitted data packet, in accordance with the foregoing embodiment of the method for forwarding the data packet of the present invention.
  • the bitmap or the forwarded notification message, or the data packet carrying the last packet identifier or the forwarding end identifier is generated.
  • the sending module 1 302 is configured to notify the target eNB of the number of packets to be transmitted or the maximum sequence number, or the status bitmap or the forwarded notification message, or carry the last packet identifier or The data packet of the end identifier is forwarded.
  • the minimum sequence number of the data packet to be transmitted by the target eNB may also be notified, and when there is a data packet that needs to be forwarded to the target eNB, Send the packet.
  • the eNB of the embodiment shown in FIG. 13 may further include a writing module 1401, which is connected to the information processing module 1301, and is configured to, according to an instruction of the information processing module 1301, the number of data packets to be transmitted, or the last packet identifier or The forwarding end identifier is sent to the information processing module 1301 by the signaling message sent by the X2 interface or the forwarded data packet; the sending module 1 302 notifies the target eNB to transmit data by sending the number of the pending data packets to the target eNB. The number of packets is notified to the target eNB that the packet forwarding is completed by transmitting a signaling message or a data packet that writes the last packet identifier or the forwarding end identifier to the target eNB.
  • FIG. 14 is a schematic structural diagram of a second embodiment of an eNB according to the present invention.
  • FIG. 15 it is a schematic structural diagram of a third embodiment of an eNB according to the present invention.
  • the eNB provided in this embodiment can be used as a target eNB for implementing the forwarding processing method terminal of the foregoing data packet of the present invention, and includes a receiving module 15 01 connected in sequence.
  • the receiving module 1501 is configured to receive the number of the data packets or the maximum sequence number or status bitmap that needs to be forwarded by the source eNB, or the forwarded notification message, or the data packet carrying the last packet identifier or the forwarding end identifier.
  • the receiving module 1501 is further configured to receive the data packet forwarded by the source eNB, and the determining module 1502 is configured to receive, according to the receiving module 1501, the number or maximum sequence number of the to-be-transmitted data packet or Status bitmap, or notification message that has been forwarded, or carried
  • a processing module 1504 may be disposed in the eNB, and
  • the storage module 1601 is further configured to be connected to the receiving module 1501 and the determining module 1502, respectively, for storing the number or maximum number of data packets received by the receiving module 1501 that need to be forwarded by the source eNB. a sequence number or status bitmap, so that the determining module 1502, when the receiving module 1501 receives the data packet sent by the sending module 1302, determines whether the receiving is completed by the source according to the number or the maximum sequence number or the status bitmap stored in the storage module 1601. Packets forwarded by the eNB.
  • FIG. 16 is a schematic structural diagram of a fourth embodiment of an eNB according to the present invention.
  • the target eNB may further include a calculation module 1701, which is respectively connected to the receiving module 1501 and the storage module 1601, and is configured to be sent to the first module of the receiving module 1501 according to the EPC.
  • the sequence number of the data packet, and the maximum sequence number of the data packet that needs to be forwarded by the source eNB is calculated, and may be further stored in the storage module 1601.
  • FIG. 17 is a schematic structural diagram of a fifth embodiment of an eNB according to the present invention.
  • the target eNB may further include a timer 1801 connected to the receiving module 1501, and a triggering module 1802 connected to the timer 1801, the determining module 1502, and the indicating module 1503, respectively.
  • the timer 1801 is used for timing, and the maximum duration of the timer 1801 may be preset.
  • the triggering module 1802 is configured to start when the receiving module 15 Q1 in the target eNB sends a handover request response message to the sending module 1 302 in the source eNB.
  • the timer 1801 starts timing, and when one of the following two conditions is met: the current time reaches the specified time of the maximum duration of the timer 1801, or according to the determination result, all the needs are received by the receiving eNB 1501 by the source eNB. Any condition in the forwarded packet triggers the indication module 1 5 03 , ie: The triggering indication module 1503 instructs the receiving module 1501 to end the waiting for receiving process of forwarding the data packet to the source eNB.
  • FIG. 18 is a schematic structural diagram of an eNB according to an embodiment of the present invention.
  • the EPC of the embodiment includes a collection module 1901 and a delivery module 1902 that are connected to each other.
  • the collecting module 1901 is configured to collect the maximum sequence number of the data packet sent by the sending module 1902 to the source eNB or the sequence number of one data packet sent to the target eNB.
  • the sending module 1902 is connected to the receiving module 1501, and is configured to The source eNB and the target eNB send the data packet, and according to the information collected by the collecting module 1901, notify the target eNB of the maximum sequence number of the data packet sent by the source eNB or the first data packet sent to the target eNB. Serial number.
  • FIG. 20 it is a schematic structural diagram of a first embodiment of a data packet forwarding processing system according to the present invention.
  • the data packet forwarding processing system includes a source eNB and a target eNB, where the source eNB may adopt the method shown in FIG. 13 or FIG.
  • the target eNB may use the eNB of the embodiment shown in FIG. 15, FIG. 16, FIG. 17, or FIG. 18, and the sending module 1 302 in the source eNB performs information interaction with the receiving module 1501 in the target eNB.
  • the packet forwarding processing system of this embodiment can be used to implement the packet forwarding processing method of the embodiment shown in FIG. 2 to FIG. 4 and FIG. 6 to FIG.
  • FIG. 21 it is a schematic structural diagram of a second embodiment of a data packet forwarding processing system according to the present invention.
  • the data packet forwarding processing system includes an EPC and a target eNB, where the EPC can adopt the EPC of the embodiment shown in FIG.
  • the eNB may adopt the eNB of the embodiment shown in FIG. 15 or FIG. 17, respectively, and the receiving module 1501 in the target eNB performs information interaction with the EPC.
  • the packet forwarding processing system of this embodiment can be used to implement the packet forwarding processing method of the embodiment shown in FIG. 5 of the present invention.
  • the target eNB needs to forward the maximum sequence number of the data packet sent to the source eNB or the sequence number of the first data packet sent to the target eNB according to the EPC, or the current eNB sends the current handover.
  • the source eNB can be notified in time, and the processing of waiting for the forwarding of the data packet to the source eNB is immediately terminated, so that the data packet from the S1 interface is processed in time, and the loss and repetition of the downlink data packet are minimized.

Description

数据包的转发处理方法、 节点与分组核心装置 技术领域
本发明涉及通信技术领域, 尤其是一种数据包的转发处理方法、 节点与 分组核心装置。 背景技术
长期演进 (Long Term Evolution, 以下简称: LTE)技术又称演进的网 格结构(Universal Terrestrial Radio Access Network, 以下简称: E-UTRAN ) 技术, 是对包括核心网在内的全网的技术演进。 如图 1所示, 为现有技术 LTE 系统的结构示意图, 在 LTE系统中, 演进型分组核心装置 (Evolved Packet Core, 以下简称: EPC) 分为控制面实体 (Mobility Management Entity, 以 下简称: 丽 E)和用户面实体 (User Plane Entity, 以下简称: UPE ) 系统构 架演进网关 (System Architecture Evolution Gateway, 以下简称: SAE Gateway) , 演进型节点 ( eNodeB, 以下简称: eNB ) 直接与 EPC 相连, eNB 同 MME/SAE Gateway之间存在 S1接口, 用于在 eNB与 MME/SAE Gateway之间 实现数据发送与信令交互; eNB之间直接相连。 eNB之间存在 X2接口, 用于 实现 eNB之间的数据转发与信息交互。
如图 2所示, 为现有技术在图 1所示的 LTE系统中进行切换的流程图, 其包 括以下步骤:
步骤 200, 在终端 (User Equipment, 以下筒称: UE ) 同网络连接建立业 务的过程中, 或最近的跟踪区 (Track Area, 以下简称: TA) 更新中, 源 eNB 中的终端上下文中包括区域漫游限制 (Area Restriction Provided)信息; 步驟 201 , 源 eNB按照区域漫游限制信息为终端配置测量控制 (Measurement control)信息, 源 eNB提供的测量控制流程辅助终端进行移 动性功能控制; 替换页(^则第 26条) 步骤 202, 终端按照预先设置的规则向源 eNB上报测量报告 (Measurement report ) ;
步骤 203, 源 eNB基于终端上^ -的测量^!告与无线资源管理信息, 决定终 端的切换 (HO decision) ;
步骤 204, 源 eNB向目标 eNB发送切换请求消息, 告知目标 eNB必要的切换 准备信息(Handover request ) , 包括无线资源, 目标 eNB的 X2接口与 S1接口 信令参考保证了目标 eNB能够定位源 eNB的 EPC;
步骤 205, 目标 eNB为了提高切换成功率, 基于接收到的 SAE承载的服务质 量(Quality of service, 以下筒称: Qos )信息执行接纳控制 (Admission control ) , 如果目标 eNB能够接纳该终端, 则为该切换配置请求的无线资源 并保留一个小区无线网格临时标识符 (Cell Radio Network Temporary Identity, 以下简称: C-RNTI ) ;
步骤 206 , 目标 eNB准备切换并且向源 eNB发送切换请求响应消息 ( Handover request ack) , 其中包括保留的 C- RNTI, 还可以包括接入参数、 系统信息、 转发隧道的无线网络层 /传输网络层 (Radio Network Layer/ Transport Network Layer, 以下筒称: RNL/TNL )等信息;
步骤 207, 源 eNB向终端发送切换命令消息 (Handover command ) , 其中 包括目标 eNB发送的切换请求响应消息中携带的信息, 源 eNB为消息执行必要 的完整性保护和加密;
步骤208, 终端向目标 eNB发起同步并从目标 eNB获取上行同步时间提前 ( Synchronization );
步骤 209, 目标 eNB响应上行分配与上行同步时间提前( UL allocation + TA for UE) ;
步骤 210 , 终端接入目标 eNB小区, 成功接入后向目标 eNB发送切换确认消 息 ( Handover confirm) , 告知目标 eNB切换流程完成;
步據 211, 目标 eNB向 EPC发送切换完成确认消息( Handover complete ) , 通知 EPC终端已经更换小区, 从而让 UPE将下行数据路径切换到目标侧并且释 放到源端的用户面与传输层网络资源;
步骤 212 , EPC向目标 eNB发送切换完成确认消息的响应消息 (Handover complete ack );
步 213 , 目标 eNB向源 eNB发送释放资源消息( Re 1 ea s e s ou r c e ) , 通知 源 eNB终端切换成功并触发资源释放;
步骤 214 , 源 eNB收到资源释放消息后, 释放同终端上下文相关的无线资 源与控制面资源 ( Re lease source ) 。
在切换过程中, 为了保证数据包的无损发送, 现有技术中, 采用数据转 发的方式在源 eNB与目标 eNB之间传输下行数据, 即: 在切换时, 源 eNB将 所有没有被终端响应的下行服务数据单元(Service Da ta Uni t , 以下简称: SDU )数据包转发到目标 eNB。 在无线接入网 (Radio Acces s Network, 以下 简称: RAN ) LTE项目中提出的需求是: eNB间用户面切换方案需要最小化下 行数据包的丢失、 重复、 乱序传输以及中断时间, 为了满足这些需求, 就需 要目标 eNB优先处理从源 eNB转发来的 SDU数据包, 处理完毕源 eNB转发来 的 SDU数据包后, 再去处理从 S1口接收的 SDU数据包。
为了保证目标 eNB优先处理从源 eNB转发来的 SDU数据包, 现有技术在 目标 eNB中设置一个定时器, 在切换过程中, 设置定时器的时长, 为了保证 避免数据包丢失,充分考虑源 eNB中的数据緩冲情况与数据包在 X2接口的传 输时延来设置定时器的时长, 在目标 eNB开始接收源 eNB转发过来的数据包 时开始计时, 在定时器超时前,认为源 eNB到目标 eNB的数据转发尚未完成, 在定时器超时时, 认为源 eNB到目标 eNB的数据转发完成, 目标 eNB可以转 向处理从 S 1接口发送的数据包。
发明人在实现本发明的过程中, 发现现有技术在保证目标 eNB优先处理 从源 eNB转发来的 SDU数据包时, 存在以下问题:
定时器的时长设置基于人为的估计与预测, 无法与源 eNB向目标 eNB转 替换页 则第 26条) 发数据包所需的实际时间匹配。 为了防止数据包丢失, 其通常基于最差传输 条件设置, 该时长通常设置得比较长。 在转发条件正常时, 设置的定时器的 时长通常比实际需要的时间长, 这样, 即使从源 eNB到目标 eNB的数据包转 发已经完成, 目标 eNB也需要等待定时器超时才能处理从 S 1接口发送的数据 包, 不必要的延长了切换时间, 降低了系统的工作效率; 而在相反的情况下, 当设置时间比较短的时候,定时器已经超时时源 eNB的数据包尚未转发完成, 目标 eNB也会转向处理从 S 1接口发送的数据包。这样, 就会造成数据包的丟 失或数据的优先处理失效。 发明内容
本发明实施例所要解决的技术问题是: 保证目标节点在处理完从源节点 转发来的数据包后, 及时结束对源节点转发来的数据包的接收处理。
本发明实施例提供了一种数据包的转发处理方法, 包括以下步骤: 目标节点检测源节点是否转发完所有待传数据包, 当所述目标节点检测 到所述源节点转发完所有待传数据包时, 结束对所述源节点转发的数据包的 接收处理。
本发明实施例提供了一种节点, 包括:
信息处理模块, 用于统计待传数据包的数目或最大序号, 或生成待传数 据包的状态位图或待传数据包转发完毕的通知消息, 或生成携带有最后包标 识或转发结束标识的数据包;
发送模块, 用于向其它节点发送所述信息处理模块统计的所述待传数据 包的数目或最大序号, 或所述信息处理模块产生的状态位图或转发完毕的通 知消息, 或所述信息处理模块产生的携带有最后包标识或转发结束标识的数 据包。
本发明实施例提供了另一种节点, 包括:
接收模块, 用于接收其它节点转发的数据包的数目或最大序号或状态位 图, 或待传数据包转发完毕的通知消息, 或携带有最后包标识或转发结束标 识的数据包;
判断模块, 用于根据所述接收模块接收的待传数据包的数目或最大序号 或状态位图, 或转发完毕的通知消息, 或携带有最后包标识或转发结束标识 的数据包,判断是否接收完毕所有需要由源节点转发的数据并输出判断结果; 指示模块, 用于根据所述判断模块的判断结果, 在所述接收模块接收完 所有待传数据包后, 指示所述接收模块结束对所述源节点转发的数据包的接 收处理。
本发明实施例提供了一种分组核心装置, 包括:
收集模块, 用于收集下发给源节点的数据包的最大序号或下发给所述目 标节点的第一个数据包的序号;
下发模块, 用于向所述源节点下发数据包, 并将所述通知节点收集到的 下发给源节点的数据包的最大序号或下发给所述目标节点的第一个数据包的 序号发送给所述目标节点。
本发明实施例中 , 目标节点检测是否接收完所有源 eNB中待传的数据包, 待目标 eNB检测到接收完所有源节点中的待传数据包, 立即结束对源节点转 发数据包的等待接收处理, 以便及时转向处理从 S1接口来的数据包, 减少了 下行数据包的丢失, 避免了重复、 乱序传输以及中断时间, 并且, 与现有技 术相比, 克服了在待传数据包转发完毕仍等待定时器超时的问题, 既保证了 对源节点转发数据的优先接收处理, 又防止了目标节点不必要的等待接收由 源节点转发数据包的时间, 提高了 LTE系统的工作效率。
下面通过附图和实施例, 对本发明实施例的技术方案做进一步的详细描 述。 附图说明
图 1为现有扶术 LTE系统的结构示意图; 替换页( 则第 26条) 图 2为现有技术在图 1所示的 LTE系统中进行切换的流程图;
图 3为本发明数据包的转发处理方法第一实施例的流程图; 图 4为本发明数据包的转发处理方法第二实施例的流程图; 图 5为本发明数据包的转发处理方法第三实施例的流程图; 图 6为本发明数据包的转发处理方法笫四实施例的流程图; 图 7为本发明数据包的转发处理方法第五实施例的流程图; 图 8为本发明数据包的转发处理方法第六实施例的流程图; 图 9为本发明数据包的转发处理方法第七实施例的流程图; 图 1 0为本发明数据包的状态位图的实施例的示意图;
图 1 1为本发明数据包的转发处理方法第八实施例的流程图; 图 12为本发明数据包的转发处理方法第九实施例的流程图; 图 1 3为本发明 eNB第一实施例的结构示意图;
图 14为本发明 eNB第二实施例的结构示意图;
图 1 5为本发明 eNB第三实施例的结构示意图;
图 1 6为本发明 eNB第四实施例的结构示意图;
图 17为本发明 eNB第五实施例的结构示意图;
图 18为本发明 eNB第六实施例的结构示意图;
图 19为本发明 EPC实施例的结构示意图;
图 20为本发明数据包转发处理系统第一实施例的结构示意图; 图 21为本发明数据包转发处理系统第二实施例的结构示意图。 具体实施方式
本发明实施例中, 目标 eNB根据 EPC发送的下发给源 eNB的数据包的最大序 号或下发给该目标 eNB的第一个数据包的序号, 或源 eNB发送的待传数据包的 数目或最大序号, 或待传数据包的状态位图或转发完毕的通知消息, 或携带 有最后包标识或转发结束标识的数据包, 结合当前接收的数据包, 检测是否 替换页 ( 则第 28条) 接收完毕由源 eNB转发的数据包, 在接收完毕时, 及时结束对源 eNB转发数据 包的等待接收处理, 以便及时转向处理从 S 1接口来的数据包。
如图 3所示, 为本发明数据包的转发处理方法第一实施例的流程图, 该实 施例包括以下步橼:
步骤 301, 在终端进行切换的过程中, 源 eNB统计未被终端响应的数据包 的数目, 未被终端响应的数据包即待传数据包, 需要转发给目标 eNB , 假设该 数目为 M, M可取不小于零的整数。
步練 302 , 源 eNB将需要转发给目标 eNB的数据包的数目 M发送给目标 eNB。 具体地, 源 eNB可以通过单独的消息向目标 eNB发送待传数据包的数目 M, 也可以将该数目 M携带在 X2接口上的信令消息中发送给目标 eNB , 还可以将其 携带在源 eNB通过 X2接口向目标 eNB转发的数据包中发送给目标 eNB。
步骤 303 , 目标 eNB接收待接收的数据包的数目 M, 并判断 M是否大于零, 即: 是否存在需要由源 eNB转发过来的数据包, 若大于零, 执行步驟 304 , 否 则, 执行步驟 308。
步驟 304 , 目标 eNB存储待接收的数据包的数目 M, 接收由源 eNB转发过来 的数据包。
步骤 305 , 目标 eNB接收到源 eNB转发过来的数据包后,根据接收到的数据 包的数目对存储的待接收的数据包的数目 M进行更新,接收到 N个由源 eNB转发 来的数据包, 便将存储的数据包的数目减小 N, 其中, N为不小于 1的整数。 目 标 eNB中存储的待接收的数据包的数目 M由于被更新而动态变化, 首次对存储 的数据包的数目 M更新后,存储的待接收的数据包的数目变为 M-N , 之后在 M-N 的基础上更新。
步骤 306 , 目标 eNB将数据包的数目减小 N后,判断更新后的待接收的数据 包的数目是否大于零, 即: 是否未接收完毕所有需要由源 eNB转发过来的数据 包, 是, 则执行步骤 307 , 否则, 执行步骤 308。
步驟 307 , 目标 eNB等待接收由源 eNB转发过来的数据包, 然后执行步骤 305。
步骤 308 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及时转 向处理由 EPC通过 S 1接收下发的数据包。
根据步驟 302, 在源 eNB将需要转发给目标 eNB的数据包的数目 M发送给目 标 eNB后, 源 eNB若接收到终端对需要转发给目标 eNB的数据包的响应信息后, 还根据终端的响应信息对需要转发给目标 eNB的数据包的数目进行更新并及 时通知目标 eNB。相应的, 目标 eNB根据源 eNB的通知消息对存储的待接收的数 据包的数目进行更新。
如图 4所示, 为本发明数据包的转发处理方法第二实施例的流程图, 该实 施例中, 源 eNB将需要转发给目标 eNB的数据包的数目携带在数据包中, 通过 X2接口发送给目标 eNB, 该实施例包括以下步驟:
步骤 401 , 在终端进行切换的过程中, 源 eNB统计未被终端响应的数据包 的数目, 未被终端响应的数据包需要转发给目标 eNB, 假设该数目为 M, M可取 不小于零的整数。
步骤 402 , 源 eNB将需要转发给目标 eNB的数据包的数目 M写入将要转发给 目标 eNB的数据包中, 发送给目标 eNB。 具体地, 可以根据预先的规定, 写入 每一个需要转发给目标 eNB的数据包中, 也可以写入第一个将要转发给目标 eNB的数据包中。 相对于写入每一个数据包而言, 仅将需要转发给目标 eNB的 数据包的数目写入第一个数据包中可以占用较少的源 eNB的系统资源,节省时 间,提高其工作效率。 以下以仅将需要转发给目标 eNB的数据包的数目写入第 一个数据包中为例进行说明。
步骤 403 , 目标 eNB接收从源 eNB转发过来的第一个数据包, 从中获取待接 收的数据包的数目 M, 由于已经接收到第一个数据包, 将待接收的数据包的数 目 M减小 1 , 即: 以后将要接收的数据包的数目为 M-l。
步骤 404, 目标 eNB判断 M-1是否大于零, 即: 是否仍存在需要由源 eNB转 发过来的数据包, 若大于零, 执行步骤 405 , 否则, 执行步驟 409。 替换页 (^9则第 26条) 步骤 405 , 目标 eNB存储待接收的数据包的数目 M- 1 , 接收由源 eNB转发过 来的数据包。.
步骤 406 , 目标 eNB接收到源 eNB转发过来的数据包后,根据接收到的数据 包的数目对存储的待接收的数据包的数目 M-1进行更新, 接收到 N个由源 eNB 转发来的数据包,便将存储的数据包的数目减小 N,其中, N为不小于 1的整数。 目标 eNB中存储的待接收的数据包的数目 M-1由于被更新而动态变化, 首次对 存储的数据包的数目 M-1更新后, 存储的待接收的数据包的数目变为 M- N - 1 , 之后在 M-N- 1的基础上更新。
步骤 407 , 目标 eNB将数据包的数目减小 N后, 判断更新后的待接收的数据 包的数目是否大于零, 即: 是否未接收完毕所有需要由源 eNB转发过来的数据 包, 如果是, 则执行步驟 408 , 否则, 执行步骤 409。
步骤 408, 目标 eNB等待接收由源 eNB转发过来的数据包, 然后执行步骤
406。
步骤 409 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及时转 向处理由 EPC通过 S 1接收下发的数据包。
在图 4所示实施例中, 源 eNB通知目标 eNB待传数据包的数目时, 若在转发 数据包的过程中, 待转发给目标 eNB的数据包的数目由于终端的响应而减少, 则源 eNB更新其余将要转发给目标 eNB的数据包的数目后, 可以通过在下一个 将要转发给目标 eNB的数据包中携带更新后的数据包的数目,也可以在之后转 发的所有数据包中携带该更新后的数据包的数目, 还可以通过单独的消息向 目标 eNB发送更新后的数据包的数目,或者将该更新后的数据包的数目携带在 X2接口上的信令消息中发送给目标 eNB。
针对源 eNB中需要向目标 eNB转发的数据包的序号连续、且 S I接口上数 据包在发送过程中不易丟失的情况下, 可以通过图 5至图 7所示实施例的方 法转发处理数据包。 如图 5所示, 为本发明数据包的转发处理方法第三实施 例的流程图, 该实施例包括以下步驟:
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替换页(细则 28条) 步驟 501, 目标 eNB接收到 EPC通过 S I接口发送的第一个数据包, 通过 解析获取该数据包的序号, 若 EPC发送的数据包的序号为明确的序号, 则不 需解析, 假定该序号为 M+l。
步驟 502 , 目标 eNB接收由源 eNB转发过来的数据包, 并获取该数据包 的序号。
步骤 503 , 若源 eNB按照数据包的序号转发数据包, 目标 eNB判断当前 接收到的数据包的序号是否为 M, 即: 是否未接收完毕所有需要由源 eNB转 发过来的数据包, 如果是, 则执行步骤 504 , 否则, 执行步驟 505。
由于源 eNB按照数据包的序号转发数据包, 优先发送低序号的数据包, 当目标 eNB在接收到从源转发来的数据包的序号为 M时, 则认为已经接收完 毕所有需要由源 eNB转发的数据包。
步骤 504 , 目标 eNB等待接收由源 eNB转发过来的数据包, 然后执行步 骤 5 02。
步驟 505 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及 时转向处理由 EPC通过 S1接口下发的数据包。
在图 5所示的实施例中, 相对于步骤 501, 也可以由 EPC通知目标 eNB 其下发给源 eNB的最后一个数据包的序号 M (步骤 601 ); 或者, 也可以由源 eNB通知 EPC下发给自己的最后一个数据包的序号 M (步驟 7 01 )。 如图 6、 图 7所示, 分别为由步骤 601与步骤 701代替步骤 501后, 本发明数据包的转 发处理方法第四、 五实施例的流程图。
另外, 图 5至图 7所示的实施例适用于源 eNB按照数据包的序号向目标 eNB转发数据包的情况, 针对源 eNB不按照数据包的序号向目标 eNB转发数 据包的情况, 如图 8所示, 为本发明数据包的转发处理方法第六实施例的流 程图, 该实施例包括以下步驟:
步骤 801 , 在终端进行切换的过程中, 源 eNB获取所有未被终端响应的 数据包中最小的序号, 并通知目标 eNB, 假定该最小的序号为 A, A为不小于 替换页(¼则第 26条) 零的整数。
具体地, 与步骤 301相同, 源 eNB可以通过单独的消息通知目标 eNB最 小的序号,也可以将该最小的序号携带在 X2接口上的信令消息中发送给目标 eNB, 还可以将其携带在源 eNB通过 X2接口向目标 eNB转发的第一个数据包 中发送给目标 eNB。
步驟 801 ' , 目标 eNB接收到 EPC通过 S1接口发送的第一个数据包, 通 过解析获取该数据包的序号 M+1 ; 或者, 由 EPC通知目标 eNB其下发给源 eNB 的最后一个数据包的序号 M; 或者, 由源 eNB通知 EPC下发给自己的最后一 个数据包的序号^
步驟 802, 目标 eNB接收由源 eNB转发过来的数据包, 获取该数据包的 序号并存储。
步驟 803 , 目标 eNB根据存储的数据包的序号, 判断是否接收完毕所有 从 A到 M的序号的数据包, 即: 是否接收完毕所有需要由源 eNB转发过来的 数据包, 如果是, 则执行步骤 805 ; 否则, 执行步驟 804。
当目标 eNB在接收到从源 eNB转发来的数据包的序号从 A到 M的所有数 据包时, 则认为已经接收完毕所有需要由源 eNB转发的数据包。
步骤 804 , 目标 eNB等待接收由源 eNB转发过来的数据包, 然后执行步 驟 802。
步驟 805 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及 时转向处理由 EPC通过 S 1接口下发的数据包。
在图 8所示的实施例中, 步骤 801 ' 也可以先于步驟 801或者与步骤 801 同时执行。
如图 9所示, 为本发明数据包的转发处理方法第七实施例的流程图, 该 实施例包括以下步骤:
步驟 901 , 在终端进行切换的过程中, 源 eNB根据未被终端响应的数据 包的序号生成需要转发给目标 eNB的数据包的状态位图。
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替换页(细则第 26条) 如图 10所示,为本发明需要转发给目标 eNB的数据包的状态位图的一实 施例的示意图, 图中给出了 10个数据包的转发状态, 例如: 以 " 1" 标识该 数据包需要转发, 以 " 0"标识该数据包不需要转发, 则根据该状态位图, 从 起始位置开始的第 1、 3、 5与 6个数据包需要由源 eNB转发给目标 eNB。 具 体是否需要转发数据包的标识可以预先在源 eNB与目标 eNB中设定。
步骤 902 , 源 eNB将需要转发给目标 eNB的数据包的状态位图发送给目 标 eNB。
具体地, 与步骤 301相同, 源 eNB可以通过单独的消息向目标 eNB发送 该状态位图, 也可以将状态位图携带在 X2接口上的信令消息中发送给目标 eNB , 还可以将其携带在源 eNB通过 X2接口向目标 eNB转发的第一个数据包 中发送给目标 eNB。
步驟 903 , 目标 eNB存储该状态位图, 接收由源 eNB转发过来的数据包。 步骤 904 , 目标 eNB通过比较状态位图与接收到的数据包, 判断是否接 收完毕所有需要由源 eNB转发过来的数据包, 如果是, 则执行步骤 906 ; 否 则, 执行步骤 905。
具体地, 目标 eNB可以比较由源 eNB转发过来的数据包的数目与状态位 图中标识为 " 1" 的状态位的数量, 在源 eNB转发过来的数据包的数目与状态 位图中标识为 " Γ 的状态位的数量相等时, 就接收完毕所有需要由源 eNB转 发过来的数据包。 另外, 在图 10所示的状态位图中各标识对应的数据包的序 号与待转发的数据包的序号一致的情况下, 步骤 902中, 源 eNB向目标 eNB 的发送状态位图时还发送该状态位图中第一个标识对应的数据包的序号, 例 如: 88002, 具体地, 可以与状态位图分开发送该第一个标识对应的数据包的 序号, 也可以将其标识在状态位图中发送, 这样, 源 eNB根据状态位图中第 一个标识对应的数据包的序号, 以及需要转发数据包的标识与第一个标识之 间的位置关系, 便可获知待传数据包的序号, 目标 eNB通过比较源 eNB转发 的数据包的序号与状态位图,便可获知是否接收完毕由源 eNB转发的数据包。
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替换页(细则第 26条) 例如: 第一个标识对应的数据包的序号为 88002时, 根据图 1 0, 待传数据包 的序号为 88002、 88004 , 88006与 88007, 当目标 eNB接收到序号为 88002、 88004 , 88006与 88007的几个数据包后, 便获知已经接收完毕所有需要由源 eNB转发过来的数据包。
若图 10所示的状态位图基于待转发的数据包的序号, 则需要在 X2接口 上传递数据包的序号, 在数据包的序号较长、 所占的比特比较多时, 为了节 省资源, 可以根据预先设置, 采用取部分低比特的裁减序号, 例如: 取实际 数据包的序号的低 8位, 目标 eNB在匹配状态位图与数据包的序号时, 也相 应的采取对应的低比特裁減序号。
步骤 905 , 目标 eNB等待接收由源 eNB转发过来的数据包, 然后执行步 骤 903中接收由源 eNB转发过来的数据包的操作。
步骤 906 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及 时转向处理由 EPC通过 S1接口下发的数据包。
如图 11所示, 为本发明数据包的转发处理方法第八实施例的流程图, 该 实施例包括以下步骤:
步驟 11 01,源 eNB在向目标 eNB转发最后一个未被终端响应的数据包时, 在该数据包中设置一个最后包标识或转发结束标识, 告知目标 eNB该数据包 为需要转发给目标 eNB的最后一个数据包, 并将该数据包转发给目标 eNB。
步骤 11 02 , 目标 eNB接收到源 eNB转发过来的携带有最后包标识或转发 结束标识的数据包时, 根据该数据包中的最后包标识或转发结束标识, 获知 数据包转发完毕。
步驟 11 03 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及 时转向处理由 EPC通过 S1接口下发的数据包。
如图 12所示, 为本发明数据包的转发处理方法第九实施例的流程图, 该 实施例包括以下步驟:
步骤 12 01 ,源 eNB在向目标 eNB转发最后一个数据包的同时,向目标 eNB 发送一个数据包转发完毕的通知消息;或是在向目标 eNB发送一个数据包后, 及时向目标 eNB发送一个数据包转发完毕的通知消息。
步骤 1202 , 目标 eNB接收到源 eNB发送的数据包转发完毕的通知消息, 获知数据包转发完毕。
步骤 1203 , 目标 eNB结束对源 eNB转发数据包的等待接收处理, 以便及 时转向处理由 EPC通过 S1接口下发的数据包。
在图 3 4 8 9 11与 12所示的实施例中, 对于源 eNB待传数据包是 否连续, 以及对 2接口上的数据是否按照序号转发的情况都适用。
在本发明的上述各数据转发处理实施例中, 当源 eNB发现不存在未被终 端响应的数据包, 也就是说, 不存在需要转发给目标 eNB的数据包时, 向目 标 eNB发送存在待传数据包的通知消息,避免了目标 eNB在接收 11接口上的 数据包时进行不必要的等待,节省了目标 eNB由于接收数据包 Π接口上的所 耗费的时间。
另外, 在本发明的上述各实施例中, 当目标 eNB获知需要接收的序号或 状态位图后, 若源 eNB又接收到终端对需要转发给目标 eNB的数据包的响应 信息, 源 eNB还根据终端的响应信息, 通知目标 eNB不需要再接收的数据包 数量或序号; 相应的, 目标 eNB根据源 eNB的通知消息对待接收的数据包的 序号或状态位图进行更新。
进一步地, 为了保证 LTE系统的健壮性, 避免由于源 eNB与目标 eNB之 间的链路故障而使目标 eNB处于不必要的空等状态, 也可以在目标 eNB中设 置一个定时器并预先设置本次切换所允许的最大时长, 在切换过程中, 目标 eNB向源 eNB发送切换请求响应消息时, 启动定时器开始计时, 在定时器超 时时, 即: 达到定时器的最大时长规定的时刻时, 即使未接收完毕由源 eNB 转发的数据包, 目标 eNB也不再等待接收由源 eNB转发的数据包, 立即转向 处理由 EPC通过 S1接口下发的数据包。
如图 13所示, 为本发明 eNB第一实施例的结构示意图,该实施例提供的
, 隱 ' eNB可作为实现本发明上述数据包的转发处理方法终端的源 eNB,其包括相互 连接的信息处理模块 1301与发送模块 1302。 其中, 与本发明的上述数据包 的转发处理方法实施例相应,信息处理模块 1301用于统计本次切换中需要转 发给目标 eNB的数据包的数目或最大序号, 或生成待传数据包的状态位图或 转发完毕的通知消息, 或生成携带有最后包标识或转发结束标识的数据包, 另外, 在统计本次切换中需要转发给目标 eNB的数据包最大序号时, 还可以 统计本次切换中需要转发给目标 eNB的数据包的最小序号;发送模块 1 302用 于通知目标 eNB待传数据包的数目或最大序号, 或状态位图或转发完毕的通 知消息, 或携带有最后包标识或转发结束标识的数据包, 另外, 在通知目标 eNB待传数据包的最大序号时, 还可以通知目标 eNB待传数据包的最小序号, 在存在需要转发给目标 eNB的数据包时, 还用于发送该数据包。
在图 13所示实施例的 eNB中, 还可以包括写入模块 1401 , 与信息处理 模块 1301连接, 用于根据信息处理模块 1 301的指示, 将待传数据包的数目, 或最后包标识或转发结束标识写入由 X2接口发送的信令消息或转发的数据 包中发送给信息处理模块 1301 ; 发送模块 1 302通过向目标 eNB发送写入待 传数据包的数目来通知目标 eNB待传数据包的数目, 通过向目标 eNB发送写 入最后包标识或转发结束标识的信令消息或数据包来通知目标 eNB数据包转 发完毕。 如图 14所示, 为本发明 eNB第二实施例的结构示意图。
如图 15所示, 为本发明 eNB第三实施例的结构示意图, 该实施例提供的 eNB可作为实现本发明上述数据包的转发处理方法终端的目标 eNB ,其包括依 次连接的接收模块 15 01、 判断模块 1502与指示模块 1503。 与发送模块 1302 相应,接收模块 1501用于接收需要由源 eNB转发的数据包的数目或最大序号 或状态位图, 或转发完毕的通知消息, 或携带有最后包标识或转发结束标识 的数据包, 若存在需要由源 eNB转发的数据包, 则接收模块 1501还用于接收 由源 eNB转发的数据包; 判断模块 1502用于根据接收模块 1501接收到的待 传数据包的数目或最大序号或状态位图, 或转发完毕的通知消息, 或携带有 最后包标识或转发结束标识的数据包, 或进一步结合接收到的由源 eNB转发 的数据包的数目或序号, 判断是否接收完毕所有需要由源 eNB转发的数据并 输出判断结果; 指示模块 1503用于根据所述判断结果, 在接收模块 1501接 收完毕所有需要由源 eNB转发的数据包后, 指示接收模块 1501结束对源 eNB 转发数据包的等待接收处理, 以便及时处理由 EPC下发的数据包。 eNB中可 以设置处理模块 1504 , 与指示模块 1503连接, 用于处理接收到的数据包, 该数据包可以是由 EPC或源 eNB或终端发送的数据包。
在图 15所示的实施例中, 还可以包括存储模块 1601 , 分别与接收模块 1501及判断模块 1502连接,用于存储接收模块 1501接收到的、需要由源 eNB 转发的数据包的数目或最大序号或状态位图,以便于判断模块 1502在接收模 块 1501接收到由发送模块 1302发送的数据包时,根据存储模块 1601中存储 的数目或最大序号或状态位图, 判断是否接收完毕需要由源 eNB转发的数据 包。 如图 16所示, 为本发明 eNB第四实施例的结构示意图。
另夕卜,图 15或图 16所示的实施例中,目标 eNB还可以包括计算模块 1701 , 分别与接收模块 1501及存储模块 1601连接, 用于根据 EPC下发给接收模块 1501的第一个数据包的序号, 计算需要由源 eNB转发的数据包的最大序号, 并可以进一步存储在存储模块 1601中。 如图 17所示, 为本发明 eNB第五实 施例的结构示意图。
进一步地, 本发明的上述实施例提供的目标 eNB中, 还可以包括与接收 模块 1501连接的定时器 1801 , 以及分别与定时器 1801、判断模块 1502及指 示模块 1503连接的触发模块 1802。 其中, 定时器 1801用于计时, 可以预先 设置该定时器 1801的最大时长; 触发模块 1802用于在目标 eNB中的接收模 块 15 Q1 向源 eNB 中的发送模块 1 302发送切换请求响应消息时启动定时器 1801开始计时, 并在满足以下两个条件中的任^ Γ一个时: 当前时刻达到定时 器 1801的最大时长规定的时刻, 或根据判断结果, 在接收模块 1501接收完 毕所有需要由源 eNB转发的数据包中任何一个条件,触发指示模块 1503 ,即: 触发该指示模块 1503指示接收模块 1501结束对源 eNB转发数据包的等待接 收处理。 如图 18所示, 为本发明 eNB笫六实施例的结构示意图。
如图 19所示, 为本发明 EPC实施例的结构示意图, 该实施例的 EPC包括 相互连接的收集模块 1901与下发模块 1902。 其中, 收集模块 1901用于收集 下发模块 1902下发给源 eNB的数据包的最大序号或下发给目标 eNB的笫一个 数据包的序号; 下发模块 1902与接收模块 1501连接, 用于向源 eNB及目标 eNB下发数据包, 另夕卜, 根据收集模块 1901收集到的信息, 通知目标 eNB下 发给源 eNB的数据包的最大序号或下发给目标 eNB的第一个数据包的序号。
如图 20所示, 为本发明数据包转发处理系统第一实施例的结构示意图, 该数据包转发处理系统包括源 eNB与目标 eNB, 其中, 源 eNB可采用图 1 3或 图 14所示的实施例的 eNB, 目标 eNB可分别采用图 15、 '图 16、 图 17或图 18 所示的实施例的 eNB ,源 eNB中的发送模块 1 302与目标 eNB中的接收模块 1501 进行信息交互。 该实施例的数据包转发处理系统可相应用于实现本发明如图 2至图 4、 图 6至图 12所示实施例的数据包的转发处理方法。
如图 21所示, 为本发明数据包转发处理系统第二实施例的结构示意图, 该数据包转发处理系统包括 EPC与目标 eNB , 其中, EPC可采用图 19所示的 实施例的 EPC , 目标 eNB可分别采用图 15或图 17所示的实施例的 eNB , 目标 eNB中的接收模块 1501与 EPC进行信息交互。 该实施例的数据包转发处理系 统可用于实现本发明如图 5所示实施例的数据包的转发处理方法。
本发明实施例中,目标 eNB根据 EPC发送的下发给源 eNB的数据包的最大 序号或下发给该目标 eNB的第一个数据包的序号, 或源 eNB发送的本次切换 中需要转发给目标 eNB的数据包的数目或最大序号, 或待传数据包的状态位 图或转发完毕的通知消息, 或携带有最后包标识或转发结束标识的数据包, 结合当前接收的数据包, 在接收完毕由源 eNB转发数据包时可及时获知, 从 而立即结束对源 eNB转发数据包的等待接收处理,以便及时转向处理从 S 1接 口来的数据包, 最小化了下行数据包的丟失、 重复、 乱序传输以及中断时间, 煢 :页( :则第 26条;) 并且, 与现有技术相比, 既保证了对源 eNB转发数据的优先接收处理, 又防 止了目标 eNB不必要的等待接收由源 eNB转发数据包的时间, 提高了 LTE系 统的工作效率。
最后所应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 本发明作限制性理解。 尽管参照上述较佳实施例对本发明进行了详细说明, 本领域的普通技术人员应当理解: 其依然可以对本发明的技术方案进行修改 或者等同替换, 而这种修改或者等同替换并不脱离本发明技术方案的精神和 范围。
1 8 ¾则.第^条')

Claims

权 利 要 求 书
1、 一种数据包的转发处理方法, 其特征在于, 包括:
目标节点检测源节点是否转发完所有待传数据包, 当所述目标节点检测 到所述源节点转发完所有待传数据包时, 结束对所述源节点转发的数据包的 接收处理。
2、根据权利要求 1所述的数据包的转发处理方法, 其特征在于, 所述目 标节点检测到所述源节点转发完所有待传数据包具体为:
所述目标节点接收所述源节点通知的待传数据包的数目, 所述目标节点 在接收到的数据包的数目达到所述待传数据包的数目时, 获知所述源节点转 发所有待传数据包。
3、根据权利要求 2所述的数据包的转发处理方法, 其特征在于, 所述源 节点通知的待传数据包的数目具体为:
由所述源节点通过消息方式通知所述目标节点的待传数据包的数目; 或 者,
由所述源节点通过 X2接口向所述 g标节点发送信令消息,所述信令消息 中包含的待传数据包的数目; 或者,
由所述源节点写入所述待传数据包中发送给所述目标节点的待传数据包 的数目。
4、根据权利要求 2或 3所述的数据包的转发处理方法, 其特征在于, 所 述接收到的数据包的数目达到所述待传数据包的数目具体为:
所述目标节点存储所述待传数据包的数目, 根据接收的数据包的数目对 所述存储的待传数据包的数目进行更新, 在更新后的待传数据包的数目为零 时, 接收到的数据包的数目达到所述待传数据包的数目。
5、根据权利要求 1所述的数据包的转发处理方法, 其特征在于, 所述目 标节点检测到所述源节点转发完所有待传数据包具体为:
所述 g标节点获取所述源节点中待传数据包的最大序号, 所述目标节点
1
细则第 26 .) 在接收到的数据包的序号为所述最大序号时, 获知所述源节点转发所有待传 数据包。
6、 根据权利要求 5所述的数据包的转发处理方法, 其特征在于, 所述目 标节点还获取所述待传数据包的最小序号; 所述目标节点在接收包括从所述 最小序号至所述最大序号的全序号数据包时, 获知所述源节点转发所有待传 数据包。
7、 根据权利要求 6所述的数据包的转发处理方法, 其特征在于, 所述目 标节点获取所述待传数据包的最小序号具体为:
所述目标节点获取所述源节点通知的待传数据包的最小序号。
8、 根据权利要求 5、 6或 7所述的数据包的转发处理方法, 其特征在于, 所述目标节点获取源节点中待传数据包的最大序号具体为:
所述目标节点获取分組核心装置下发的第一个数据包的序号, 将所述第 一个数据包的序号减 1 , 获取所述待传数据包的最大序号; 或者,
所述目标节点获取所述分组核心装置通知的该分组核心装置下发给所述 源节点的数据包的最大序号, 所述目标节点由下发给所述源节点的数据包的 最大序号获知待传数据包的最大序号; 或者,
所述目标节点获取所述源节点通知的需要由所述源节点转发的数据包的 最大序号。
9、根据权利要求 1所述的数据包的转发处理方法, 其特征在于, 所述目 标节点检测到所述源节点转发完所有待传数据包具体为:
所述目标节点接收所述源节点根据所述待传数据包生成的状态位图, 所 述目标节点接收到的数据包满足所述状态位图要求时, 获知所述源节点转发 所有待传数据包。
1 0、 根据权利要求 9所述的数据包的转发处理方法, 其特征在于, 所述 目标节点接收到的数据包满足所述状态位图要求具体为:
所述目标节点接收到的数据包的数目达到所述状态位图要求转发的数据 包的数目; 或者,
20
替 '页(细则 ^ 26条) 所述目标节点接收全所述状态位图要求转发的序号的数据包。
11、 根据权利要求 1所述的数据包的转发处理方法, 其特征在于, 所述 目标节点检测到所述源节点转发完所有待传数据包具体为:
所述目标节点接收所述源节点发送的通知消息, 所述通知消息中包括数 据包转发完毕或者不存在待传数据包, 或者
所述目标节点接收所述源节点转发的最后一个数据包, 所述源节点在所 述最后一个数据包中写入了最后包标识或转发结束标识;
所述目标节点根据所述通知消息, 或者所述数据包中的最后包标识或转 发结束标识, 袭知所述源节点转发所有待传数据包。
12、根据权利要求 1至 n任意一项所述的数据包的转发处理方法, 其特 征在于, 还包括:
所述目标节点向所述源节点发送切换请求响应消息时, 启动定时器, 并 开始计时, 所述定时器由所述目标节点预先设定, 并设定最大时长; 在当前 时刻达到所述最大时长或所述目标节点检测到接收完所有待传数据包时, 所 述目标节点结束对所述源节点转发的数据包的接收处理。
1 3、 一种节点, 其特征在于, 包括:
信息处理模块, 用于统计待传数据包的数目或最大序号, 或生成待传数 据包的状态位图或待传数据包转发完毕的通知消息, 或生成携带有最后包标 识或转发结束标识的数据包;
发送模块, 用于向其它节点发送所述信息处理模块统计的所述待传数据 包的数目或最大序号, 或所述信息处理模块产生的状态位图或转发完毕的通 知消息, 或所述信息处理模块产生的携带有最后包标识或转发结束标识的数 据包。
14、 根据权利要求 13所述的节点, 其特征在于, 还包括:
写入模块, 用于将所述待传数据包的数目, 或所述最后包标识或转发结 束标识写入由 X2接口发送的信令消息中, 或写入待传数据包中。
15、 一种节点, 其特征在于, 包括: 替 ¾第 26 ) 接收模块, 用于接收其它节点转发的数据包的数目或最大序号或状态位 图, 或待传数据包转发完毕的通知消息, 或携带有最后包标识或转发结束标 识的数据包;
判断模块, 用于根据所述接收模块接收的待传数据包的数目或最大序号 或状态位图, 或转发完毕的通知消息, 或携带有最后包标识或转发结束标识 的数据包,判断是否接收完毕所有需要由源节点转发的数据并输出判断结果; 指示模块, 用于根据所述判断模块的判断结果, 在所述接收模块接收完 所有待传数据包后, 指示所述接收模块结束对所述源节点转发的数据包的接 收处理。
16、 根据权利要求 15所述的节点, 其特征在于, 还包括:
计算模块, 用于根据所述接收模块接收的、 分组核心装置下发给所述其 它节点的第一个数据包的序号, 计算需要由所述其它节点转发的数据包的最 大序号。
17、 才艮据权利要求 15或 16所述的节点, 其特征在于, 还包括: 存储模块, 用于存储所述待传数据包的数目或最大序号或状态位图。
18、 根据权利要求 15或 16所述的节点, 其特征在于, 还包括: 定时器, 用于预先设置一个最大时长, 并计时;
触发模块, 用于向所述其它节点发送切换请求响应消息时启动所述定时 器开始计时, 并在当前时刻达到所述最大时长或所述接收模块接收完所有待 传数据包时, 触发所述指示模块。
19、 一种分组核心装置, 其特征在于, 包括:
收集模块, 用于收集下发给源节点的数据包的最大序号或下发给所述目 标节点的第一个数据包的序号;
下发模块, 用于向所述源节点下发数据包, 并将所述通知节点收集到的 下发给源节点的数据包的最大序号或下发给所述目标节点的笫一个数据包的 序号发送给所述目标节点。
22
替换 ^ ;)
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