CN101330451B - Method for processing forwarding of data packet, node and packet core apparatus - Google Patents

Method for processing forwarding of data packet, node and packet core apparatus Download PDF

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Publication number
CN101330451B
CN101330451B CN 200710126762 CN200710126762A CN101330451B CN 101330451 B CN101330451 B CN 101330451B CN 200710126762 CN200710126762 CN 200710126762 CN 200710126762 A CN200710126762 A CN 200710126762A CN 101330451 B CN101330451 B CN 101330451B
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data
enb
packet
transferred
bag
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CN101330451A (en
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马小飞
黄颖华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN 200710126762 priority Critical patent/CN101330451B/en
Priority to PCT/CN2008/071394 priority patent/WO2008154885A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end

Abstract

The invention discloses a data packet forwarding processing method, a node and a packet core device thereof. The method comprises the following steps: a target node detects whether a source node forwards all data packets to be transmitted, and the reception of data packets forwarded by the source node is terminated when the target node detects that the source node has forwarded all the data packets to be transmitted. The detection of the reception of all the data packets to be transmitted is realized by the following steps: the source node notifies the target node of the number of the data packets to be transmitted in this time, and the target node notifies that all the data packets required to be forwarded by the source node are received when the number of the received data packets reaches the number of the data packets to be transmitted. By using the method, a target evolved node (eNB) can be notified that all the data packets forwarded by a source eNB are received in time, so as to terminate the reception waiting for the data packets forwarded by the source eNB and immediately turn to process the data packets from S1 interface, thereby ensuring the processing priority of the data packets forwarded by the source eNB and eliminate unnecessary waiting time of the target eNB.

Description

The method for processing forwarding of packet, node and packet core apparatus
Technical field
The present invention relates to communication technical field, especially a kind of method for processing forwarding of packet, node and packet core apparatus.
Background technology
Long Term Evolution (Long Term Evolution, hereinafter to be referred as: LTE) technology claims again network configuration (the Universal Terrestrial Radio Access Network of evolution, hereinafter to be referred as: E-UTRAN) technology, being the technology evolution to the whole network that comprises core net, is the new technology development project of the maximum of over the past two years 3GPP startup.As shown in Figure 1, structural representation for prior art LTE system, in the LTE system, cancelled radio network controller (Radio Network controller, hereinafter to be referred as: RNC), Evolved Packet Core device (Evolved Packet Core, hereinafter to be referred as: EPC) be divided into chain of command entity (Mobility Management Entity, hereinafter to be referred as: MME) and user entity (User PlaneEntity, hereinafter to be referred as: UPE) system architecture evolution gateway (System Architecture EvolutionGateway, hereinafter to be referred as: SAE Gateway), evolved node (eNodeB, hereinafter to be referred as: eNB) directly link to each other with EPC, eNB is used for realizing that with there being the S1 interface between the MME/SAE Gateway data send and Signalling exchange between eNB and MME/SAE Gateway; Directly link to each other between the eNB.There is X2 interface between the eNB, is used for data retransmission and information interaction between the realization eNB.
As shown in Figure 2, carry out the flow chart that baseline switches for prior art in LTE system shown in Figure 1, it may further comprise the steps:
Step 200, at terminal (User Equipment, hereinafter to be referred as: UE) set up in the professional process with network connection, or nearest tracking area (Track Area, hereinafter to be referred as: TA) in the renewal, comprise roaming restriction (Area Restriction Provided) information in zone in the terminal context among the eNB of source;
Step 201, source eNB is that terminal configuration is measured control (Measurement control) information according to zone roaming restricted information, the measurement control flow accessory terminal that source eNB provides carries out mobility functions control;
Step 202, terminal according to the rule that sets in advance to source eNB reporting measurement reports (Measurementreport);
Step 203, source eNB is based on the measurement report of terminal to report and the switching (HO decision) of wireless resource management information decision terminal;
Step 204, source eNB sends handover request message to target eNB, inform the handover preparation information (Handover request) of target eNB necessity, comprise Radio Resource, the X2 interface of target eNB and S1 interface signaling are with reference to the EPC that has guaranteed that target eNB can locating source eNB;
Step 205, target eNB is in order to improve handover success rate, service quality (Quality of service based on the SAE carrying that receives, hereinafter to be referred as: Qos) information and executing is admitted control (Admissioncontrol), if target eNB can be admitted this terminal, then for the Radio Resource of this handover configurations request and keep Cell Radio Network Temporary Identifier/Identity, Cell-RNTI symbol (Cell Radio Network Temporary Identity, hereinafter to be referred as: C-RNTI);
Step 206, target eNB is prepared to switch and send handover request ack message (Handover request ack) to source eNB, comprising the C-RNTI that keeps, (Radio Network Layer/Transport Network Layer is hereinafter to be referred as the information such as RNL/TNL) can also to comprise the wireless network layer/transport network layer of access parameter, system information, forwarding tunnel;
Step 207, source eNB sends switching command message (Handover command) to terminal, the information of carrying in the handover request ack message comprising the target eNB transmission, source eNB is that message is carried out necessary integrity protection and encryption;
Step 208, terminal is initiated to obtain uplink synchronous time advance (Synchronisation) synchronously and from target eNB to target eNB;
Step 209, target eNB response uplink assignment and uplink synchronous time advance (UL allocation+TA for UE);
Step 210, terminal access target eNB residential quarter is successfully accessed backward target eNB and is sent switch acknowledgment message (Handover confirm), informs that the target eNB switching flow finishes;
Step 211, target eNB sends to switch to EPC finishes acknowledge message (Handover complete), notice EPC terminal is changing district more, thereby allows UPE that the downlink data path is switched to target side and be discharged into user's face and the transport layer network resource of source;
Step 212, EPC sends to target eNB and switches the response message (Handovercomplete ack) of finishing acknowledge message;
Step 213, target eNB sends releasing resource message (Release source) to source eNB, and notification source eNB terminal handover success also triggers resource release;
Step 214 after source eNB receives resource release message, discharges with the context-sensitive Radio Resource of terminal and chain of command resource (Release source).
In handoff procedure, in order to guarantee the harmless transmission of packet, in the prior art, adopt mode transmitting downlink data between source eNB and target eNB of data retransmission, that is: when switching, source eNB with all not by the descending service data unit of terminal response (Service Data Unit, hereinafter to be referred as: SDU) package forward is to target eNB.At wireless access network (Radio Access Network, hereinafter to be referred as: the demand that RAN) proposes in the LTE project is: user's face handover scheme need to minimize the losing of downlink data packet, repetition, out of order transmission and break period between eNB, in order to satisfy these demands, just need the target eNB priority treatment to transmit the SDU packet of coming from source eNB, after the source eNB that is disposed transmits next SDU packet, remove again to process the SDU packet that receives from the S1 mouth.
Transmit the SDU packet of coming in order to guarantee the target eNB priority treatment from source eNB, prior art arranges a timer in target eNB, in handoff procedure, the duration of timer is set, in order to guarantee to avoid data-bag lost, take into full account data buffering situation among the eNB of source and packet arrange timer in the propagation delay time of X2 interface duration, when beginning packet that reception sources eNB forwards, target eNB begins timing, before timer expiry, think that source eNB not yet finishes to the data retransmission of target eNB, when timer expiry, think that source eNB finishes to the data retransmission of target eNB, the packet that target eNB can diversion treatments sends from the S1 interface.
The inventor finds that when guaranteeing that the target eNB priority treatment is transmitted next SDU packet from source eNB, there is following problem in prior art at least in realizing process of the present invention:
The duration setting of timer is based on artificial estimation and prediction, can't with source eNB to the required real time coupling of target eNB forwarding data bag.In order to prevent data-bag lost, it is usually based on the poorest transmission conditions setting, and this duration arranges longly usually, and for example: when considering the transmission of data bag, the packet that source eNB is to be transmitted will increase, the maximum transmitted time delay on the X2 interface etc.When the forwarding condition is normal, the duration of the timer that arranges is usually long than the time of actual needs, like this, even the package forward from source eNB to target eNB is finished, target eNB needs also that waiting timer is overtime could process the packet that sends from the S1 interface, unnecessary prolongation switching time, reduced the operating efficiency of system; And in opposite situation, when setup times is relatively short, although the packet of source eNB was not yet transmitted and is finished when timer was overtime, the packet that target eNB also can diversion treatments sends from the S1 interface.Like this, will cause packet lose or the priority treatment of data lost efficacy.
Summary of the invention
Embodiment of the invention technical problem to be solved is: guarantee that destination node after handling the packet that comes from the source node forwarding, in time finishes source node is transmitted the reception ﹠ disposal of next packet.
According to embodiments of the invention, the method for processing forwarding of a kind of packet that provides may further comprise the steps:
Whether target eNB detection resources eNB has transmitted all data to be transferred bags;
When described target eNB detects described source eNB and transmitted all data to be transferred bags, finish the reception ﹠ disposal of packet that described source eNB is transmitted.
According to embodiments of the invention, a kind of node that provides comprises:
Message processing module, for number or the maximum sequence number of adding up the data to be transferred bag, or the state bitmap of generation data to be transferred bag or the complete notification message of data to be transferred bag forwarding, or generation carries the packet that last bag identifies or the forwarding end identifies;
Sending module, be used for sending to other eNB number or the maximum sequence number of the described data to be transferred bag of described message processing module statistics, or the state bitmap that produces of described message processing module or transmit complete notification message, or described message processing module produce carry last bag sign or transmit the packet that finishes sign.
According to embodiments of the invention, the another kind of node that provides comprises:
Receiver module be used for to receive number or maximum sequence number or the state bitmap of the packet that other eNB transmits, or the data to be transferred bag transmits complete notification message, or carries last bag sign or transmit the packet that finishes sign;
Judge module, be used for number or maximum sequence number or state bitmap according to the data to be transferred bag of described receiver module reception, or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, judge whether to receive all data that need to be transmitted by described source eNB and export judged result;
Indicating module is used for the judged result according to described judge module, after described receiver module is received all data to be transferred bags, indicates described receiver module end to the reception ﹠ disposal of the packet of described source eNB forwarding.
According to embodiments of the invention, a kind of packet core apparatus that provides comprises:
Collection module, the sequence number that is used for collecting the maximum sequence number of the packet that is handed down to source eNB or is handed down to first packet of described target eNB;
Issue module, be used for issuing packet to described source eNB, and the sequence number that will be handed down to the maximum sequence number of described source eNB packet or be handed down to first packet of target eNB is notified to described target eNB.
In the embodiment of the invention, destination node detect whether accepted packet to be passed among the active eNB, but target eNB detects the data to be transferred bag of receiving in institute's active node, finish immediately the wait reception ﹠ disposal to source node forwarding data bag, so that in time diversion treatments is from the next packet of S1 interface, minimized losing of downlink data packet, repeat, out of order transmission and break period, and, compared with prior art, overcome at the data to be transferred bag and transmitted the overtime deficiency of complete still waiting timer, both guaranteed the preferential reception ﹠ disposal to the source node forwarding data, prevented that again the unnecessary wait of destination node from receiving the time by source node forwarding data bag, improved the operating efficiency of LTE system.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of prior art LTE system.
Fig. 2 is that prior art is carried out the flow chart that baseline switches in LTE system shown in Figure 1.
Fig. 3 is the flow chart of method for processing forwarding first embodiment of packet of the present invention.
Fig. 4 is the flow chart of method for processing forwarding second embodiment of packet of the present invention.
Fig. 5 is the flow chart of method for processing forwarding the 3rd embodiment of packet of the present invention.
Fig. 6 is the flow chart of method for processing forwarding the 4th embodiment of packet of the present invention.
Fig. 7 is the flow chart of method for processing forwarding the 5th embodiment of packet of the present invention.
Fig. 8 is the flow chart of method for processing forwarding the 6th embodiment of packet of the present invention.
Fig. 9 is the flow chart of method for processing forwarding the 7th embodiment of packet of the present invention.
Figure 10 is the schematic diagram of embodiment of the state bitmap of packet of the present invention.
Figure 11 is the flow chart of method for processing forwarding the 8th embodiment of packet of the present invention.
Figure 12 is the flow chart of method for processing forwarding the 9th embodiment of packet of the present invention.
Figure 13 is the structural representation of eNB the first embodiment of the present invention.
Figure 14 is the structural representation of eNB the second embodiment of the present invention.
Figure 15 is the structural representation of eNB the 3rd embodiment of the present invention.
Figure 16 is the structural representation of eNB the 4th embodiment of the present invention.
Figure 17 is the structural representation of eNB the 5th embodiment of the present invention.
Figure 18 is the structural representation of eNB the 6th embodiment of the present invention.
Figure 19 is the structural representation of EPC embodiment of the present invention.
Figure 20 is the structural representation of package forward treatment system the first to eight embodiment of the present invention.
Figure 21 is the structural representation of package forward treatment system the 9th to the 12 embodiment of the present invention.
Embodiment
In the embodiment of the invention, the maximum sequence number of the packet of the source of the being handed down to eNB that target eNB sends according to EPC or be handed down to the sequence number of first packet of this target eNB, or number or the maximum sequence number of the data to be transferred bag of source eNB transmission, or the state bitmap of data to be transferred bag or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, packet in conjunction with current reception, detect and whether receive the packet of being transmitted by source eNB, when receiving, in time finish the wait reception ﹠ disposal to source eNB forwarding data bag, so that in time diversion treatments is from the next packet of S1 interface.
As shown in Figure 3, be the flow chart of method for processing forwarding first embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 301, in the process that terminal is switched, source eNB adds up not by the number of the packet of terminal response, is not the data to be transferred bag by the packet of terminal response, need to be transmitted to target eNB, supposes that this number is M, desirable zero the integer that is not less than of M.
Step 302, the number M that source eNB is transmitted to needs the packet of target eNB sends to target eNB.
Particularly, source eNB can send by independent message the number M of data to be transferred bag to target eNB, also this number M can be carried in the signaling message on the existing X2 interface and send to target eNB, it can also be carried at source eNB and in the packet of target eNB forwarding, send to target eNB by X2 interface.
Step 303, target eNB receive the number M of packet to be received, and judge M whether greater than zero, whether have the packet that need to be forwarded by source eNB that is:, if greater than zero, and execution in step 304, otherwise, execution in step 308.
Step 304, target eNB are stored the number M of packet to be received, and receive the packet that is forwarded by source eNB.
Step 305, after target eNB receives the packet that source eNB forwards, number M to the packet to be received of storage upgrades according to the number of the packet that receives, receive N packet that is come by source eNB forwarding, just the number of packet with storage reduces N, wherein, N is not less than 1 integer.The number M of the packet to be received of storing in the target eNB is owing to be updated and dynamic change, and after first the number M of the packet of storage being upgraded, the number of the packet to be received of storage becomes M-N, upgrades on the basis of M-N afterwards.
After step 306, target eNB reduce N with the number of packet, judge that whether the number of the packet to be received after upgrading is greater than zero, that is: whether receiving the packet that all need to be forwarded by source eNB, is that then execution in step 308, otherwise, execution in step 307.
Step 307, target eNB wait for and receive the packet that is forwarded by source eNB that then execution in step 305.
Step 308, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that in time diversion treatments receives the packet that issues by EPC by S1.
According to step 302, after the number M that source eNB is transmitted to needs the packet of target eNB sends to target eNB, after if source eNB receives terminal is transmitted to target eNB to needs the response message of packet, the number that also according to the response message of terminal needs is transmitted to the packet of target eNB upgrades and timely notification target eNB.Accordingly, target eNB is upgraded according to the notification message of the source eNB number to the packet to be received of storage.
As shown in Figure 4, be the flow chart of method for processing forwarding second embodiment of packet of the present invention, among this embodiment, source eNB is carried at the number that needs are transmitted to the packet of target eNB in the packet, send to target eNB by X2 interface, this embodiment may further comprise the steps:
Step 401, in the process that terminal is switched, source eNB adds up not by the number of the packet of terminal response, is not transmitted to target eNB by the packets need of terminal response, supposes that this number is M, desirable zero the integer that is not less than of M.
Step 402, the number M that source eNB is transmitted to needs the packet of target eNB writes in the packet that will be transmitted to target eNB and sends to target eNB.Particularly, can write in each packet that need to be transmitted to target eNB according to regulation in advance, also can write in first packet that will be transmitted to target eNB.For writing each packet, the number that only needs is transmitted to the packet of target eNB writes the system resource that can take less source eNB in first packet, saves time, and improves its operating efficiency.Below write in first packet as example take the number that only needs is transmitted to the packet of target eNB and to describe.
Step 403, target eNB receives first packet that forwards from source eNB, therefrom obtains the number M of packet to be received, owing to received first packet, the number M of packet to be received is reduced 1, that is: the number of the packet that will receive later on is M-1.
Step 404, target eNB are judged M-1 whether greater than zero, whether still have the packet that need to be forwarded by source eNB that is:, if greater than zero, and execution in step 405, otherwise, execution in step 409.
Step 405, target eNB are stored the number M-1 of packet to be received, and receive the packet that is forwarded by source eNB.
Step 406, after target eNB receives the packet that source eNB forwards, number M-1 to the packet to be received of storage upgrades according to the number of the packet that receives, receive N packet that is come by source eNB forwarding, just the number of packet with storage reduces N, wherein, N is not less than 1 integer.The number M-1 of the packet to be received of storing in the target eNB is owing to be updated and dynamic change, and after first the number M-1 of the packet of storage being upgraded, the number of the packet to be received of storage becomes M-N-1, upgrades on the basis of M-N-1 afterwards.
After step 407, target eNB reduce N with the number of packet, judge that whether the number of the packet to be received after upgrading is greater than zero, that is: whether receiving the packet that all need to be forwarded by source eNB, is that then execution in step 409, otherwise, execution in step 408.
Step 408, target eNB wait for and receive the packet that is forwarded by source eNB that then execution in step 406.
Step 409, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that in time diversion treatments receives the packet that issues by EPC by S1.
During the number of source eNB by mode notification target eNB data to be transferred bag shown in Figure 4, if in the process of forwarding data bag, the number of the packet of target eNB to be transmitted to is owing to the response of terminal reduces, after then source eNB upgrades the number of the packet that will be transmitted to target eNB afterwards, can be by the number of the packet after carrying renewal in the packet that will be transmitted to target NB at the next one, also can after the number of packet after carrying this renewal in all packets of transmitting, the number of the packet after can also send upgrading to target eNB by independent message, the number of the packet after perhaps will upgrading are carried in the signaling message on the existing X2 interface and send to target eNB.
For the sequence number of the packet that needs among the eNB of source to transmit to target eNB continuously and in the situation that packet is difficult for losing in process of transmitting on the S1 interface, can be by Fig. 5 to method forward process packet embodiment illustrated in fig. 7.As shown in Figure 5, be the flow chart of method for processing forwarding the 3rd embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 501, target eNB receive first packet that EPC sends by the S1 interface, obtain the sequence number of this packet by parsing, if the sequence number of the packet that EPC sends is clear and definite sequence number, then need not resolve, and suppose that this sequence number is M+1.
Step 502, target eNB receives the packet that is forwarded by source eNB, and obtains the sequence number of this packet.
Step 503, if source eNB according to the sequence number forwarding data bag of packet, target eNB judges whether the sequence number of the current packet that receives is M, that is: whether receiving the packet that all need to be forwarded by source eNB, is that then execution in step 505, otherwise, execution in step 504.
Because source eNB is according to the sequence number forwarding data bag of packet, the preferential packet that sends low sequence number when target eNB is receiving the sequence number of transmitting the packet that comes from the source and is M, is then thought to have received the packet that all need to be transmitted by source eNB.
Step 504, target eNB wait for and receive the packet that is forwarded by source eNB that then execution in step 502.
Step 505, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that the packet that timely diversion treatments is issued by the S1 interface by EPC.
In the embodiment shown in fig. 5, with respect to step 501, also can it be handed down to the sequence number M (step 601) of last packet of source eNB by EPC notification target eNB; The maximum sequence number (step 701) of the packet that perhaps, also can need to be transmitted by described source eNB by source eNB notification target eNB.Such as Fig. 6, shown in Figure 7, be respectively by after step 601 and the step 701 replacement step 501 flow chart of method for processing forwarding fourth, fifth embodiment of packet of the present invention.
In addition, Fig. 5 is applicable to source eNB according to the sequence number of the packet situation to target eNB forwarding data bag to embodiment shown in Figure 7, for source eNB not according to the sequence number of the packet situation to target eNB forwarding data bag, as shown in Figure 8, be the flow chart of method for processing forwarding the 6th embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 801, in the process that terminal is switched, source eNB obtains all not by sequence number minimum in the packet of terminal response, and notification target eNB, supposes that this minimum sequence number is A, and A is not less than zero integer.
Particularly, identical with step 301, source eNB can be by the sequence number of independent message informing target eNB minimum, also sequence number that should minimum can be carried in the signaling message on the existing X2 interface and send to target eNB, it can also be carried in first packet that source eNB transmits to target eNB by X2 interface and send to target eNB.
Step 801 ', target eNB receives EPC by first packet that the S1 interface sends, and obtains the sequence number M+1 of this packet by parsing; Perhaps, it is handed down to the sequence number M of last packet of source eNB by EPC notification target eNB; Perhaps, be handed down to the sequence number M of last packet of oneself by source eNB notice EPC.
Step 802, target eNB receives the packet that is forwarded by source eNB, obtains sequence number and the storage of this packet.
Step 803, target eNB judge whether to receive the packet of all sequence numbers from A to M according to the sequence number of the packet of storage, that is: whether receiving the packet that all need to be forwarded by source eNB, is that then execution in step 805, otherwise, execution in step 804.
When target eNB during at all packets from A to M of the sequence number that receives the packet that transmits from source eNB, then think to have received the packet that all need to be transmitted by source eNB.
Step 804, target eNB wait for and receive the packet that is forwarded by source eNB that then execution in step 802.
Step 805, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that the packet that timely diversion treatments is issued by the S1 interface by EPC.
In the embodiment shown in fig. 8, step 801 ' also can carry out simultaneously prior to step 801 or with step 801.
As shown in Figure 9, be the flow chart of method for processing forwarding the 7th embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 901, in the process that terminal is switched, source eNB is according to the state bitmap that is not transmitted to the packet of target eNB by the serial number gencration needs of the packet of terminal response.
As shown in figure 10, need to be transmitted to the schematic diagram of an embodiment of state bitmap of the packet of target eNB for the present invention, provided the forwarding state of 10 packets among the figure, for example: identify this packets need with " 1 " and transmit, identifying this packet with " 0 " does not need to transmit, then according to this state bitmap, the 1st, 3,5 and 6 packets need that begins from original position is transmitted to target eNB by source eNB.Specifically whether need the sign of forwarding data bag in source eNB and target eNB, to set in advance.
Step 902, the state bitmap that source eNB is transmitted to needs the packet of target eNB sends to target eNB.
Particularly, identical with step 301, source eNB can send this state bitmap to target eNB by independent message, also the state bitmap can be carried in the signaling message on the existing X2 interface and send to target eNB, it can also be carried at source eNB and in first packet of target eNB forwarding, send to target eNB by X2 interface.
Step 903, target eNB are stored this state bitmap, receive the packet that is forwarded by source eNB.
Step 904, target eNB be by relatively state bitmap and the packet that receives, and judges whether to receive the packet that all need to be forwarded by source eNB, is, then execution in step 906, otherwise, execution in step 905.
Particularly, the quantity for the mode bit of " 1 " is known in the number of the packet that target eNB can be relatively forwarded by source eNB and the acceptance of the bid of state bitmap, when the number of the packet that forwards at source eNB and the acceptance of the bid of state bitmap are known quantity for the mode bit of " 1 " and equated, just receive the packet that all need to be forwarded by source eNB.In addition, in the situation that the sequence number of packet corresponding to each sign is consistent with the sequence number of packet to be transmitted in state bitmap shown in Figure 10, in the step 902, source eNB also sends the sequence number of packet corresponding to first sign in this state bitmap during to the transmission state bitmap of target eNB, for example: 88002, particularly, can separate the sequence number that sends this first packet corresponding to sign with the state bitmap, also it can be identified in the state bitmap and send, like this, source eNB is according to the sequence number of packet corresponding to first sign in the state bitmap, and need position relationship between the sign of forwarding data bag and first sign, just can know the sequence number of data to be transferred bag, target eNB just can know whether receive the packet of being transmitted by source eNB by sequence number and the state bitmap of the packet of reference source eNB forwarding.For example: the sequence number of the packet that first sign is corresponding is 88002 o'clock, according to Figure 10, the sequence number of data to be transferred bag is 88002,88004,88006 and 88007, when target eNB after to receive sequence number be several packets of 88002,88004,88006 and 88007, just know to have received the packet that all need to be forwarded by source eNB.
If state bitmap shown in Figure 10 is based on the sequence number of packet to be transmitted, then need to upload at X2 interface the sequence number of delivery data bag, when long, the shared bit of the sequence number of packet is many, for saving resource, can according to setting in advance, adopt the reduction sequence number of getting the low bit of part, for example: the least-significant byte of getting the sequence number of actual data packet, target eNB also takes corresponding low bit to reduce sequence number when the sequence number of matching status bitmap and packet accordingly.
Step 905, target eNB are waited for and are received the packet that is forwarded by source eNB, then receive the operation of the packet that is forwarded by source eNB in the execution in step 903.
Step 906, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that the packet that timely diversion treatments is issued by the S1 interface by EPC.
As shown in figure 11, be the flow chart of method for processing forwarding the 8th embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 1101, source eNB is when transmitting last not by the packet of terminal response to target eNB, a last bag sign is set in this packet or transmits the end sign, inform this packet of target eNB for need to being transmitted to last packet of target eNB, and with this package forward to target eNB.
When step 1102, target eNB receive source eNB forwards carry last bag sign or transmit the packet that finishes sign, according to the last bag sign in this packet or transmit and finish sign, know that package forward is complete.
Step 1103, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that the packet that timely diversion treatments is issued by the S1 interface by EPC.
As shown in figure 12, be the flow chart of method for processing forwarding the 9th embodiment of packet of the present invention, this embodiment may further comprise the steps:
Step 1201, source eNB sends the notification message that package forward is complete to target eNB when transmitting last packet to target eNB; Or after sending a packet to target eNB, in time send the notification message that package forward is complete to target eNB.
Step 1202, target eNB receive the complete notification message of package forward that source eNB sends, and know that package forward is complete.
Step 1203, target eNB finishes the wait reception ﹠ disposal to source eNB forwarding data bag, so that the packet that timely diversion treatments is issued by the S1 interface by EPC.
In the embodiment shown in Fig. 3,4,8,9,11 and 12, whether continuous for source eNB data to be transferred bag, and to the situation whether data on the X2 interface are transmitted according to sequence number, all be suitable for.
In above-mentioned each data retransmission Processing Example of the present invention, receive packet on the X2 interface for fear of the unnecessary wait of target eNB, save target eNB because the spent time on the receive data bag X2 interface, when source eNB finds not exist not by the packet of terminal response, that is to say, when not having the packet that need to be transmitted to target eNB, send the notification message that does not have the data to be transferred bag to target eNB.
In addition, in the various embodiments described above of the present invention, after target eNB is known the sequence number or state bitmap that needs receive, if source eNB receives again terminal is transmitted to the packet of target eNB to needs response message, source eNB is also according to the response message of terminal, and notification target eNB does not need the data packet number or the sequence number that receive again; Accordingly, target eNB sequence number or the state bitmap for the treatment of the packet of reception according to the notification message of source eNB upgrades.
Further, in order to guarantee the robustness of LTE system, avoid being in the unnecessary states such as sky owing to the link failure between source eNB and the target eNB makes target eNB, a timer also can be set in target eNB and set in advance this and switch the maximum duration that allows, in handoff procedure, when target eNB sends handover request ack message to source eNB, start timer and begin timing, when timer expiry, that is: when reaching moment of maximum duration regulation of timer, even do not receive the packet of being transmitted by source eNB, target eNB also no longer wait for to receive the packet of being transmitted by source eNB, immediately the packet that issued by the S1 interface by EPC of diversion treatments.
As shown in figure 13, structural representation for eNB the first embodiment of the present invention, the eNB that this embodiment provides can be used as the source eNB of the method for processing forwarding terminal that realizes the above-mentioned packet of the present invention, and it comprises interconnective message processing module 1301 and sending module 1302.Wherein, corresponding with the method for processing forwarding embodiment of above-mentioned packet of the present invention, message processing module 1301 is used for statistics, and this switches number or the maximum sequence number of the packet that needs to be transmitted to target eNB, or generate the state bitmap of data to be transferred bag or transmit complete notification message, or generation carries last bag sign or transmits the packet that finishes sign, in addition, when needing to be transmitted to the maximum sequence number of packet of target eNB during this switches in statistics, can also add up the smallest sequence number that this needs to be transmitted to the packet of target eNB in switching; Sending module 1302 is used for number or the maximum sequence number of notification target eNB data to be transferred bag, or state bitmap or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, in addition, when the maximum sequence number of notification target eNB data to be transferred bag, the smallest sequence number of all right notification target eNB data to be transferred bag when existence need to be transmitted to the packet of target eNB, also is used for sending this packet.
In eNB embodiment illustrated in fig. 13, can also comprise writing module 1401, be connected with message processing module 1301, be used for the indication according to message processing module 1301, with the number of data to be transferred bag, or last bag sign or transmit finishes to send to message processing module 1301 in the packet that sign writes the signaling message that sent by X2 interface or forwarding; Sending module 1302 comes notification target eNB package forward complete by sending the number that the number that writes the data to be transferred bag comes notification target eNB data to be transferred bag to target eNB by send the signaling message or the packet that write last bag sign or transmit the end sign to target eNB.As shown in figure 14, be the structural representation of eNB the second embodiment of the present invention.
As shown in figure 15, structural representation for eNB the 3rd embodiment of the present invention, the eNB that this embodiment provides can be used as the target eNB of the method for processing forwarding terminal that realizes the above-mentioned packet of the present invention, and it comprises receiver module 1501, the judge module 1502 and indicating module 1503 that connects successively.Corresponding with sending module 1302, receiver module 1501 is used for receiving number or maximum sequence number or the state bitmap of the packet that need to be transmitted by source eNB, or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, need to be by the packet of source eNB forwarding if exist, then receiver module 1501 also is used for receiving the packet of being transmitted by source eNB; Judge module 1502 is for number or maximum sequence number or the state bitmap of the data to be transferred bag that receives according to receiver module 1501, or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, or further combined with number or the sequence number of the packet of being transmitted by source eNB that receives, judge whether to receive all data that need to be transmitted by source eNB and export judged result; Indicating module 1503 is used for according to described judged result, after receiver module 1501 receives all packets that need to be transmitted by source eNB, the wait reception ﹠ disposal that indication processing module 1504 finishes source eNB forwarding data bag is in order in time process the packet that is issued by EPC.Can set handling module 1504 among the eNB, with indicating module 1503, for the treatment of the packet that receives, this packet can be the packet that is sent by EPC or source eNB or terminal.
In the embodiment shown in fig. 15, can also comprise memory module 1601, be connected with receiver module 1501 and judge module 1502 respectively, be used for that the storing received module is 1501 that receive, number or maximum sequence number or the state bitmap of the packet that need to be transmitted by source eNB, so that judge module 1502 is when receiver module 1501 receives the packet that is sent by sending module 1302, according to number or maximum sequence number or the state bitmap of storage in the memory module 1601, judging whether to receive need to be by the packet of source eNB forwarding.As shown in figure 16, be the structural representation of eNB the 4th embodiment of the present invention.
In addition, among Figure 15 or the embodiment shown in Figure 16, target eNB can also comprise computing module 1701, be connected with receiver module 1601 and memory module 1601 respectively, be used for being handed down to according to EPC the sequence number of first packet of receiver module 160, the maximum sequence number of the packet that calculating need to be transmitted by source eNB, and can further be stored in the memory module 1601.As shown in figure 17, be the structural representation of eNB the 5th embodiment of the present invention.
Further, in the target eNB that the above embodiment of the present invention provides, can also comprise the timer 1801 that is connected with receiver module 1501, and the trigger module 1802 that is connected with timer 1801, judge module and indicating module 1503 respectively.Wherein, timer 1801 is used for timing, can set in advance the maximum duration of this timer 1801; Trigger module 1802 is used for starting timer 1801 beginning timing at the receiver module 1501 of target eNB when the sending module 1302 among the eNB of source sends handover request ack message, and during in satisfying following two conditions any one: current time reaches the moment of the maximum duration regulation of timer 1801, or according to judged result, receive any one condition in all packets that need to be transmitted by source eNB at receiver module 1501, trigger indicating module 1503, that is: trigger the wait reception ﹠ disposal that these indicating module 1503 indication receiver modules 1501 finish source eNB forwarding data bag.As shown in figure 18, be the structural representation of eNB the 6th embodiment of the present invention.
As shown in figure 19, be the structural representation of EPC embodiment of the present invention, the EPC of this embodiment comprises interconnective collection module 1901 and issues module 1902.Wherein, collection module 1901 be used for collecting issue module 1902 be handed down to source eNB packet maximum sequence number or be handed down to the sequence number of first packet of target eNB; Issuing module 1902 is connected with receiver module 1501, be used for issuing packet to source eNB and target eNB, in addition, according to the information that collection module 1901 is collected, notification target eNB be handed down to source eNB packet maximum sequence number or be handed down to the sequence number of first packet of target eNB.
As shown in figure 20, structural representation for package forward treatment system the first to eight embodiment of the present invention, this package forward treatment system comprises source eNB and target eNB, wherein, source eNB can adopt the eNB of Figure 13 or embodiment shown in Figure 14, target eNB can adopt respectively the eNB of Figure 15, Figure 16, Figure 17 or embodiment shown in Figure 180, and the sending module 1302 among the eNB of source carries out information interaction with the receiver module 1501 in the target eNB.The package forward treatment system of this first to six embodiment can be applied to mutually to realize that the present invention such as Fig. 2 to Fig. 4, Fig. 6 are to the method for processing forwarding of packet embodiment illustrated in fig. 12.
As shown in figure 21, structural representation for package forward treatment system the 9th to the 12 embodiment of the present invention, this package forward treatment system comprises EPC and target eNB, wherein, EPC can adopt the EPC of embodiment shown in Figure 19, target eNB can adopt respectively the eNB of Figure 15 or embodiment shown in Figure 17, and the receiver module 1501 in the target eNB carries out information interaction with EPC.Nine, the package forward treatment system of the tenth embodiment can be used in the present invention the as shown in Figure 5 method for processing forwarding of the packet of embodiment.
In the embodiment of the invention, the maximum sequence number of the packet of the source of the being handed down to eNB that target eNB sends according to EPC or be handed down to the sequence number of first packet of this target eNB, or source eNB send this need to be transmitted to number or the maximum sequence number of the packet of target eNB in switching, or the state bitmap of data to be transferred bag or transmit complete notification message, or carry last bag sign or transmit the packet that finishes sign, packet in conjunction with current reception, in time know receiving by source eNB forwarding data Bao Shike, thereby finish immediately the wait reception ﹠ disposal to source eNB forwarding data bag, so that in time diversion treatments is from the next packet of S1 interface, minimized losing of downlink data packet, repeat, out of order transmission and break period, and, compared with prior art, both guaranteed the preferential reception ﹠ disposal to source eNB forwarding data, prevented that again the unnecessary wait of target eNB from receiving the time by source eNB forwarding data bag, improved the operating efficiency of LTE system.
It should be noted last that: above embodiment is only in order to illustrating technical scheme of the present invention, but not to the understanding of being restricted property of the present invention.Although with reference to above-mentioned preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to the spirit and scope that replacement does not break away from technical solution of the present invention.

Claims (19)

1. the method for processing forwarding of a packet is characterized in that, comprising:
The maximum sequence number of the packet of the source of the being handed down to eNB that target evolved node eNB sends according to Evolved Packet Core device EPC or be handed down to the sequence number of first packet of this target eNB, or number or the maximum sequence number of the data to be transferred bag of source eNB transmission, or the state bitmap of data to be transferred bag or transmit complete notification message, or carry last bag sign or transmit the data to be transferred bag that finishes sign, packet in conjunction with current reception, whether detection resources eNB has transmitted all data to be transferred bags, and described data to be transferred bag is not by the packet of terminal response in the process that terminal is switched;
When described target eNB detects described source eNB and transmitted all data to be transferred bags, finish the reception ﹠ disposal of data to be transferred bag that described source eNB is transmitted.
2. the method for processing forwarding of packet according to claim 1 is characterized in that, described target eNB detects described source eNB and transmitted all data to be transferred bags and be specially:
Described source eNB notifies the number of described target eNB data to be transferred bag, when described target eNB reaches the number of described data to be transferred bag at the number of the data to be transferred bag that receives, knows that described source eNB has transmitted all data to be transferred bags.
3. the method for processing forwarding of packet according to claim 2 is characterized in that, described source eNB notifies the number of described target eNB data to be transferred bag to be specially:
Described source eNB notifies the number of the described data to be transferred bag of described target eNB by message mode; Perhaps,
Described source eNB sends signaling message, described signaling message by X2 interface to described target eNB
In comprise the number of described data to be transferred bag; Perhaps,
Described source eNB writes the number of described data to be transferred bag in the described data to be transferred bag and sends to described target eNB;
Wherein, described X2 interface is the interface between the eNB in the Long Term Evolution LTE system, is used for data retransmission and information interaction between the eNB.
4. according to claim 2 or the method for processing forwarding of 3 described packets, it is characterized in that, connect
The number that the number of the data to be transferred bag of receiving reaches described data to be transferred bag is specially:
Described target eNB is stored the number of described data to be transferred bag, upgrade according to the number of the data to be transferred bag that the receives number to the data to be transferred bag of described storage, when the number of the data to be transferred bag after renewal was zero, the number of the data to be transferred bag that receives reached the number of described data to be transferred bag.
5. the method for processing forwarding of packet according to claim 1, it is characterized in that, if source eNB transmits the data to be transferred bag according to the sequence number of data to be transferred bag to described target eNB, and the sequence number of described data to be transferred bag is continuous, and then described target eNB detects described source eNB and transmitted all data to be transferred bags and be specially:
Described target eNB is obtained the maximum sequence number of data to be transferred bag among the described source eNB, when described target eNB is described maximum sequence number in the sequence number of the data to be transferred bag that receives, knows that described source eNB has transmitted all data to be transferred bags.
6. the method for processing forwarding of packet according to claim 1, it is characterized in that, if source eNB transmits the data to be transferred bag not according to the sequence number of data to be transferred bag to described target eNB, then described target eNB detects described source eNB and has transmitted all data to be transferred bags and be specially:
Described target eNB is obtained maximum sequence number and the smallest sequence number of data to be transferred bag among the described source eNB; When described target eNB comprises from described smallest sequence number to the full sequence number data to be transferred bag of described maximum sequence number in reception, know that described source eNB has transmitted all data to be transferred bags.
7. the method for processing forwarding of packet according to claim 6 is characterized in that, the smallest sequence number that described target eNB is obtained the data to be transferred bag that need to be transmitted by described source eNB is specially:
Described source eNB notifies the smallest sequence number of described target eNB data to be transferred bag.
8. according to claim 5, the method for processing forwarding of 6 or 7 described packets, it is characterized in that the maximum sequence number that described target eNB is obtained the data to be transferred bag that need to be transmitted by described source eNB is specially:
Described target eNB is obtained the sequence number of first packet that the Evolved Packet Core device issues, and the sequence number of described first packet is subtracted 1, obtains the maximum sequence number of described data to be transferred bag; Perhaps,
The maximum sequence number that described Evolved Packet Core device notifies this Evolved Packet Core device of described target eNB to be handed down to the packet of described source eNB, described target eNB are known the maximum sequence number of data to be transferred bag by the maximum sequence number of the packet that is handed down to described source eNB; Perhaps,
Described source eNB notifies the maximum sequence number of the data to be transferred bag that described target eNB need to be transmitted by described source eNB.
9. the method for processing forwarding of packet according to claim 1 is characterized in that, described target eNB detects described source eNB and transmitted all data to be transferred bags and be specially:
Described source eNB generates the state bitmap according to described data to be transferred bag, and described state bitmap sent to described target eNB, when the data to be transferred bag that described target eNB receives satisfies described state bitmap and requires, know that described source eNB has transmitted all data to be transferred bags.
10. the method for processing forwarding of packet according to claim 9 is characterized in that, the data to be transferred bag that described target eNB receives satisfies described state bitmap and requires to be specially:
The number of the data to be transferred bag that described target eNB receives reaches the number that described state bitmap requires the data to be transferred bag transmitted; Perhaps,
Described target eNB receives the data to be transferred bag of the sequence number of complete described state bitmap requirement forwarding.
11. the method for processing forwarding of packet according to claim 1 is characterized in that, described target eNB detects described source eNB and has transmitted all data to be transferred bags and be specially:
Described source eNB sends a notification message to described target eNB, comprises in the described notification message that the forwarding of data to be transferred bag is complete or do not have the data to be transferred bag, perhaps
Described source eNB writes last bag sign or transmits the end sign in being transmitted to last data to be transferred bag of described target eNB;
Described target eNB is according to described notification message, and perhaps last bag sign or the forwarding in the described data to be transferred bag finishes sign, knows that described source eNB has transmitted all data to be transferred bags.
12. the method for processing forwarding of packet according to claim 1 is characterized in that, also comprises:
The maximum duration of timer is set in described target eNB in advance, when described target eNB sends handover request ack message to described source eNB, start described timer and begin timing, reach described maximum duration or described target eNB at current time and detect when receiving all data to be transferred bags, described target eNB finishes the reception ﹠ disposal of data to be transferred bag that described source eNB is transmitted.
13. an evolved node is characterized in that, comprising:
Message processing module, for number or the maximum sequence number of adding up the data to be transferred bag, or the state bitmap of generation data to be transferred bag or the complete notification message of data to be transferred bag forwarding, or generation carries the data to be transferred bag that last bag identifies or the forwarding end identifies; Described data to be transferred bag is not by the packet of terminal response in the process that terminal is switched;
Sending module, be used for sending to other evolved node eNB number or the maximum sequence number of the described data to be transferred bag of described message processing module statistics, or the state bitmap that produces of described message processing module or transmit complete notification message, or the last bag that carries that described message processing module produces identifies or transmits the data to be transferred bag that finishes sign, so that described other evolved node eNB is according to number or maximum sequence number or the state bitmap of described data to be transferred bag, or transmit complete notification message, or carry last bag sign or transmit the data to be transferred bag that finishes sign, judge whether to receive all data to be transferred bags, and so that described other evolved node eNB after all data to be transferred bags are received in judgement, finishes the reception ﹠ disposal to described data to be transferred bag.
14. evolved node according to claim 13 is characterized in that, also comprises:
Writing module, be connected with described message processing module, be used for the indication according to described message processing module, number with described data to be transferred bag, or described last bag sign or transmit finishes sign and writes in the signaling message that is sent by X2 interface or write in the data to be transferred bag, and is sent to described message processing module;
Wherein, described X2 interface is the interface between the eNB in the Long Term Evolution LTE system, is used for data retransmission and information interaction between the eNB.
15. an evolved node is characterized in that, comprising:
Receiver module be used for to receive number or maximum sequence number or the state bitmap of the data to be transferred bag that other evolved node eNB transmits, or the data to be transferred bag transmits complete notification message, or carries last bag sign or transmit the data to be transferred bag that finishes sign; Described data to be transferred bag is not by the packet of terminal response in the process that terminal is switched;
Judge module, be used for number or maximum sequence number or state bitmap according to the data to be transferred bag of described receiver module reception, or transmit complete notification message, or carry last bag sign or transmit the data to be transferred bag that finishes sign, judge whether to receive all data that need to be transmitted by described other evolved node eNB and export judged result;
Indicating module is used for the judged result according to described judge module, after described receiver module is received all data to be transferred bags, indicates described receiver module end to the reception ﹠ disposal of the data to be transferred bag of described other evolved node eNB forwarding.
16. evolved node according to claim 15 is characterized in that, also comprises:
Memory module is connected with judge module with described receiver module respectively, is used for storing number or maximum sequence number or the state bitmap of described data to be transferred bag.
17. according to claim 15 or 16 described evolved nodes, it is characterized in that, also comprise:
Computing module, be connected with memory module with described receiver module respectively, be used for being handed down to according to the Evolved Packet Core device sequence number of first packet of described receiver module, the maximum sequence number of the data to be transferred bag that calculating need to be transmitted by described other eNB, and described maximum sequence number is stored in the memory module.
18. according to claim 15 or 16 described evolved nodes, it is characterized in that, also comprise:
Timer is connected with described receiver module, is used for setting in advance a maximum duration, and timing;
Trigger module, be connected with described timer, judge module and indicating module respectively, be used for when described other eNB sends handover request ack message, starting described timer and begin timing, and when current time reaches described maximum duration or described receiver module and receives all data to be transferred bags, trigger described indicating module.
19. an Evolved Packet Core device is characterized in that, comprising:
Collection module, the sequence number that is used for collecting the maximum sequence number of the packet that is handed down to the evolved node eNB in source or is handed down to first packet of target eNB;
Issue module, be used for issuing packet to described source eNB, and the sequence number that will be handed down to the maximum sequence number of described source eNB packet or be handed down to first packet of target eNB is notified to described target eNB, so that described target eNB judges according to the maximum sequence number of described source eNB packet or the sequence number that is handed down to first packet of target eNB whether source eNB transmits complete data to be transferred bag, and so that described target eNB is judging that described data to be transferred bag transmits the reception ﹠ disposal that finishes data to be transferred bag that described source eNB is transmitted when complete; Described data to be transferred bag is not by the packet of terminal response in the process that terminal is switched.
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