CN102076040A - Method and system for forwarding data during handover - Google Patents

Method and system for forwarding data during handover Download PDF

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Publication number
CN102076040A
CN102076040A CN2011100217749A CN201110021774A CN102076040A CN 102076040 A CN102076040 A CN 102076040A CN 2011100217749 A CN2011100217749 A CN 2011100217749A CN 201110021774 A CN201110021774 A CN 201110021774A CN 102076040 A CN102076040 A CN 102076040A
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gtp
extension header
pdcp sdu
message
base station
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卫琳
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New Postcom Equipment Co Ltd
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New Postcom Equipment Co Ltd
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Abstract

The invention discloses a method and a system for forwarding data during handover. The technical scheme is suitable for a Long Term Evolution (LTE) access system. In the process that user equipment (UE) is handed over to a target base station from a source base station, the source base station adds a GPRS Tunneling Protocol for User plane (GTP-U) extension header into GTP-U information corresponding to a Packet Data Convergence Protocol-Service Data Unit (PDCP-SDU) which requires to save residual duration of a discard timer, after the residual duration of the discard timer corresponding to the PDCP-SDU is filled in the GTP-U extension header, the GTP-U information into which the GTP-U extension header is added is transmitted to the target base station, and the target base station starts a new discard timer according to the residual duration of the discard timer corresponding to the PDCP-SDU, wherein the residual duration is carried in the GTP-U extension header. By adopting the technical scheme, the residual duration of the discard timer of the PDCP-SDU can be transmitted to the target base station.

Description

Data forwarding method in a kind of handoff procedure and system
Technical field
The present invention relates to mobile communication technology, data forwarding method and system in particularly a kind of handoff procedure.
Background technology
Long Term Evolution (LTE, Long Term Evolution) system adopts flat network configuration.Fig. 1 is the LTE network structure.As shown in Figure 1, universal mobile telecommunications system wireless access network (the E-UTRAN of evolution, Evolved Universal Terrestrial Radio AccessNetwork) constitutes by base station (eNB, evolved NodeB), transmit related news by X2 interface between the eNB; (Evolved Packet Corenet work EPC) comprises gateway (S-GW, Serving Gateway) and Mobility Management Entity (MME, Mobility Management Entity) to Evolved Packet Core, and is mutual by S 1 interface and eNB.Wherein each eNB comprises a plurality of sub-districts.
As Radio Resource control (RRC, Radio Resource Control) configuration packet data convergence protocol (PDCP, Packet Data Convergence Protocol) during the entity parameter, can optionally configuration abandoning timer duration to PDCP, this duration can be 50ms, 100ms, 150ms, 300ms, 500ms, 700ms, 1500ms or infinity.When having disposed this PDCP entity parameter, described PDCP entity can abandon timer for each descending PDCP-one of service data unit PDCP SDU configuration, PDCP is receiving the service data unit (SDU that core net is sent, Service Data Unit) can start this timer the time, when the timer expiry that abandons of a PDCP SDU, then abandon this SDU and PDU corresponding with it; If corresponding PDU has been submitted to lower floor, then indicate lower floor that it is abandoned.
Switch to from source base station the process of target BS at UE, at the carrying of the affirmation pattern RLC-AM of Radio Link control, source base station can be transmitted the descending PDCPSDU that is not identified and give Target cell.Fig. 2 is an X2 switching flow schematic diagram in the existing LTE system.As shown in Figure 2,
Step 201 provides and switches the restriction tabulation;
Step 202, source base station send to user terminal UE and measure control messages;
Step 203, source base station are carried out ascending resource to user terminal UE and are distributed;
Step 204, user terminal case UE sends source base station to source base station and sends measurement report;
Step 205, source base station carries out the switch decision of UE;
Step 206, source base station sends handoff request message to target BS;
Step 207, target BS is admitted the control to UE;
Step 208, target BS sends switching request response to source base station;
Step 209, source base station are carried out downlink resource to UE and are distributed;
Step 210, cell-of-origin send the RRC that comprises mobile control information to UE and connect reconfiguration message;
Step 211, UE disconnect with source base station under being connected of sub-district, carry out simultaneous operation with Target cell under the target BS;
Step 212, source base station sends failure and is stored in PDCP SDU packet in the buffer queue to the target BS transmission;
Step 213, source base station sends to target BS with the sequence state of PDCP SDU packet;
Step 214, target BS is stored in the PDCP SDU packet that source base station sends in the buffer queue;
Step 215, UE and target BS are synchronous;
Step 216, target BS carries out the ascending resource distribution to UE, and the Timing Advance of UE is set;
Step 217, UE reshuffles to target BS transmission RRC connection and finishes message;
Step 218, target BS is to MME transmit path switching request message;
Step 219, MME sends user's face update inquiry information to S-GW;
Step 220, S-GW switches the downlink path operation;
Step 221, S-GW sends user's face to MME and upgrades response message;
Step 222, MME is to Target cell transmit path switching request response message;
Step 223, Target cell sends UE context release message to the cell-of-origin;
Step 224, the cell-of-origin discharges resource.
To shown in the step 214, after UE sends switching command, carry out carrying that downlink data transmit at needs at source base station as the step 212 among Fig. 2, source base station can be transmitted the descending PDCP SDU that is not identified to target BS.Fig. 3 be in the prior art in handoff procedure the data forwarding schematic flow sheet.As shown in Figure 3,
At down direction, SDU 0, SDU 1, SDU 2, SDU 3 and SDU 4 are passed to source base station by S-GW.Source base station successfully sends SDU 0, SDU 1, SDU 2 and SDU 4 to UE, but SDU 3 sends failure.Wherein, UE has only confirmed SDU 0 and SDU 1, then comprises SDU 2, SDU 3 and SDU 4 in the transmission buffer memory of source base station.If this carrying is the RLC-AM pattern, then source base station can be SDU 2, and SDU 3, and SDU 4 is transmitted to target BS.But the residual time length that abandons timer does not send to target BS thereupon together.
In sum, in the UE handoff procedure, source base station has only been transmitted corresponding PDCP SDU to target BS, the timer that abandons of PDCP SDU is not transmitted target BS, and target BS can only be according to the parameter that abandons timer that configures in the base station the abandon timer new for this SDU starts.Lost effect with regard to causing at the timer that source base station starts like this, can not well embody the control of base station service delay.
Summary of the invention
The invention provides the data forwarding method in a kind of handoff procedure, this method can keep the residual time length that abandons timer of PDCP SDU.
The present invention also provides the data forwarding system in a kind of handoff procedure, and this system can keep the residual time length that abandons timer of PDCP SDU.
For achieving the above object, this technical scheme is achieved in that
The invention discloses the data forwarding method in a kind of handoff procedure, this method is applicable in the LTE connecting system, UE switches to the process of target BS from source base station, and the PDCP SDU that source base station will send the described UE in the buffer memory is transmitted to target BS and specifically comprises:
Source base station obtains the residual time length that abandons timer that sends the PDCP SDU in the buffer memory;
Source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS;
Target BS receive described increased the prolate-headed GTP-U message of GTP-U after, GTP-U extension header to this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
The present invention also provides the data forwarding system in a kind of handoff procedure, and this system comprises source base station, target BS and UE; Wherein, UE is in from source base station under the state that target BS switches:
Source base station, be used for obtaining the residual time length that abandons timer of the PDCP SDU that sends buffer memory, according to the accessed residual time length that abandons timer, in the GTP-U message corresponding, increase a GTP-U extension header with described PDCPSDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS;
Target BS, be used to receive the described prolate-headed GTP-U message of GTP-U that increased, GTP-U extension header in this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
From the above, technical scheme provided by the invention: source base station by give with send buffer memory in the corresponding GTP-U message of PDCP SDU in add the extension header of a GTP-U, after the extension header of this GTP-U is inserted the residual time length that abandon timer corresponding with described PDCP SDU, send to target BS, target BS according to the entrained residual time length that abandon timer corresponding of the extension header of GTP-U in the GTP-U message that receives with PDCP SDU start new and described PDCP SDU corresponding abandon timer.Technical scheme of the present invention makes when switching, and needs the residual time length that abandons timer of the PDCP SDU of forwarding to be kept, and can better control according to professional end-to-end delay, reduces the unnecessary data transmission of eating dishes without rice or wine.
Description of drawings
Fig. 1 is a LTE network structure of the prior art;
Fig. 2 is an X2 switching flow schematic diagram in the existing LTE system;
Fig. 3 be in the prior art in handoff procedure the data forwarding schematic flow sheet;
Fig. 4 is the flow chart of the data forwarding method in a kind of handoff procedure among the present invention;
Fig. 5 is a data forwarding schematic flow sheet in the handoff procedure among the present invention;
Fig. 6 is that PDCP SDU carries a prolate-headed structural representation of GTP-U among the present invention;
Fig. 7 is that PDCP SDU carries two prolate-headed structural representations of GTP-U among the present invention;
Fig. 8 is the structural representation of the data forwarding system in a kind of handoff procedure among the present invention.
Embodiment
Fig. 4 is the flow chart of the data forwarding method in a kind of handoff procedure among the present invention.This method is applicable in the wireless network long-term evolving network LTE connecting system, user equipment (UE) switches to the process of target BS from source base station, and downlink grouped data convergence protocol-service data unit PDCP SDU that source base station will send the described UE in the buffer memory is transmitted to target BS and specifically comprises:
Step 401, source base station are obtained the residual time length that abandons timer that sends the PDCP SDU in the buffer memory;
Step 402, source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS;
Step 403, target BS receive described increased the prolate-headed GTP-U message of GTP-U after, GTP-U extension header to this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.This method can send to target BS with the residual time length that abandons timer of the PDCP SDU of source base station buffer memory.
This method is applicable in the LTE connecting system that UE switches to the process of target BS from source base station, and the PDCP SDU that source base station will send the described UE in the buffer memory is transmitted to target BS specifically as shown in Figure 5.Fig. 5 is a data forwarding schematic flow sheet in the handoff procedure among the present invention.Wherein, when source base station will send PDCP SDU in the buffer memory and be transmitted to target BS, the residual time length that abandons timer of described PDCP SDU also is transmitted to target BS.
For example, comprise SDU 2, SDU 3 and SDU 4 in the transmission buffer memory of source base station.Wherein the residual time length that abandons timer of SDU 2 is 100ms, and the residual time length that abandons timer of SDU 3 is 80ms, and the residual time length that abandons timer of SDU 4 is 50ms; Under the RLC-AM pattern, then source base station also sends to target BS with the corresponding residual time length that abandons timer again SDU 2 when SDU 3 and SDU 4 are transmitted to target BS together.
Source base station can obtain the residual time length that abandons timer that sends the PDCP SDU in the buffer memory; Source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, insert the residual time length that abandons timer with described PDCP SDU in this GTP-U extension header.
In preferred embodiment of the present invention, we define the extension header of a kind of GTP-U and realize the technical program, and the extension header of the GTP-U of definition is as shown in table 1.
The value of next extension header byte Prolate-headed type
0000?0000 There is not extension header
0000?0001 Keep-only effective chain of command
0000?0010 Keep-only effective chain of command
0100?0000 Udp port provides the trigger message of the source port of UDP
0110?0000 Abandon the value of timer
1100?0000 PDCP PDU sequence number
1100?0001 Keep-only effective chain of command
1100?0010 Keep-only effective chain of command
Table 1
The value of the next extension header field shown in the table 1 is 0,110 0000, and the extension header type is the value that abandons timer, and the extension header form of corresponding GTP-U is as shown in table 2.
Byte Bit
1 0x01
2-3 Abandon the value (Millisecond) of timer
4 Next extension header type
Table 2
As shown in table 2, source base station is inserted the information of this GTP-U extension header length of expression in prolate-headed first byte of described GTP-U, in prolate-headed last byte of described GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the information of the residual time length that abandons timer of corresponding PDCP SDU.As shown in Figure 6, Fig. 6 is that PDCP SDU carries a prolate-headed structural representation of GTP-U among the present invention.
As shown in Figure 6, in last byte of former GTP-U head, insert the information of the next GTP-U extension header type of indication.As shown in Figure 6, the byte of inserting in the 12nd byte of former GTP-U head is 0,110 0000, represent that then the next GTP-U extension header type after this GTP-U head is the value that abandons timer, because this GTP-U extension header is 4 bytes altogether, then insert 0,000 0001 in prolate-headed the 1st byte of this GTP-U, in prolate-headed the 2nd byte of GTP-U and the 3rd byte, insert the value of the residual time length that abandons timer of PDCP SDU, represent with Millisecond.For example the residual time length that abandons timer of PDCP SDU is 100ms, and then Dui Ying the 2nd byte is that the 0,000 0000 and the 3rd byte is 01100100.In prolate-headed last byte of this GTP-U, insert the byte of the next GTP-U extension header type of indication,, then insert 0,000 0000 in prolate-headed last byte of this GTP-U if do not have other extension header after this GTP-U extension header.
In other embodiments of the invention, source base station increases another GTP-U extension header in the GTP-U corresponding with described PDCP SDU, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the serial number information of corresponding PDCP PDU.As shown in Figure 7, Fig. 7 is that PDCP SDU carries two prolate-headed structural representations of GTP-U among the present invention.
As shown in Figure 7, inserting the prolate-headed type of the 1100 0000 next GTP-U of indication in last byte of former GTP-U head is PDCP PDU sequence number; Because first GTP-U extension header is 4 bytes altogether, then in prolate-headed the 1st byte of this first GTP-U, insert 0,000 0001, in prolate-headed the 2nd byte of this first GTP-U and the 3rd byte, insert the information of representing PDCP PDU sequence number; As the prolate-headed type of next GTP-U is the value that abandons timer, and then inserting second prolate-headed type of GTP-U of 0,110 0000 indication in prolate-headed the 4th byte of this first GTP-U is the value that abandons timer; Because this GTP-U extension header is 4 bytes altogether, then insert 0,000 0001 in prolate-headed the 1st byte of this GTP-U, in prolate-headed the 2nd byte of this GTP-U and the 3rd byte, insert the value of the residual time length that abandons timer of PDCP SDU because do not have next GTP-U extension header then prolate-headed the 4th byte of this GTP-U be 0,000 0000.
The present invention also provides the data forwarding system in a kind of handoff procedure, and this system comprises source base station, target BS and UE; Wherein, UE is in from source base station under the state that target BS switches, and as shown in Figure 8, Fig. 8 is the structural representation of the data forwarding system in a kind of handoff procedure among the present invention.
Source base station 801, be used for obtaining the residual time length that abandons timer of the PDCP SDU that sends buffer memory, according to the accessed residual time length that abandons timer, in the GTP-U message corresponding, increase a GTP-U extension header with described PDCPSDU, in this GTP-U extension header, insert the corresponding residual time length that abandons timer with described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS 802;
Target BS 802, be used to receive the described prolate-headed GTP-U message of GTP-U that increased, GTP-U extension header in this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
In said system, source base station 801 comprises transmission cache module 803, adds a processing module 804 and sending module 805, wherein:
Send cache module 803, be used for obtaining the residual time length that abandons timer of the PDCP SDU that sends buffer memory, the residual time length that abandons timer of the described PDCP SDU that gets access to is sent to add a processing module 804;
Add a processing module 804, be used to receive the residual time length that abandons timer that the transmission cache module sends described PDCP SDU, in the GTP-U message corresponding, increase a GTP-U extension header with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCPSDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to sending module 805;
Sending module is used to receive the prolate-headed GTP-U message of GTP-U that added increase that processing module sends, and the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS 802;
In said system, target BS 802 comprises receiver module 806, decaptitate parsing module 807 and startup module 808, wherein:
Receiver module 806, the prolate-headed GTP-U message of GTP-U that has been used for increase that reception sources base station 801 sends sends to the parsing module 807 of decaptitating with the described prolate-headed GTP-U message of GTP-U that increased;
The parsing module 807 of decaptitating, the prolate-headed GTP-U message of GTP-U that has been used to receive increase that receiver module 806 sends, the described prolate-headed GTP-U message of GTP-U that increased is carried out parse operation, obtain the residual time length that abandon timer corresponding, the more described residual time length that abandon timer corresponding with PDCP SDU sent to startup module 808 with described PDCP SDU;
Start module 808, be used for the residual time length that abandon timer corresponding that send according to the parsing module 807 of decaptitating, start new corresponding with the described PDCP SDU timer that abandons with PDCP SDU.
In said system, add a processing module 804, be used for increasing a GTP-U extension header in described GTP-U message, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the information of the residual time length that abandons timer of the described PDCP SDU of expression.
In said system, add a processing module 804, be used for increasing another GTP-U extension header in described GTP-U message, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the serial number information of corresponding PDCP PDU.
In the prior art, UE from source base station to the process that target BS switches, only transmitted corresponding PDCP SDU, do not transmit the corresponding timer that abandons, target BS can only start new corresponding with this PDCP SDU timer that abandons according to configuration, so just cause not playing effect, can not well embody the control of base station service delay at the timer that abandons that source base station starts.
Among the present invention, add a GTP-U extension header in the pairing GTP-U message of PDCP SDU that sends in the buffer memory by giving, send to target BS after the extension header of this GTP-U is inserted the residual time length that abandons timer corresponding with described PDCPSDU, the residual time length that abandons timer of the PDCP SDU that carries in the extension header of target BS according to GTP-U starts new corresponding with the described PDCP SDU timer that abandons.Technical scheme of the present invention makes that the residual time length that abandons timer of the PDCP SDU of forwarding is kept when switching, and can better control according to professional end-to-end delay, reduces the unnecessary data transmission of eating dishes without rice or wine.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (8)

1. the data forwarding method in the handoff procedure, it is characterized in that, this method is applicable in the wireless network long-term evolving network LTE connecting system, user equipment (UE) switches to the process of target BS from source base station, and the service data unit SDU that source base station will send the downlink grouped data convergence protocol PDCP of the described UE in the buffer memory is transmitted to target BS and specifically comprises:
Source base station obtains the residual time length that abandons timer that sends the PDCP SDU in the buffer memory;
Source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS;
Target BS receive described increased the prolate-headed GTP-U message of GTP-U after, GTP-U extension header to this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
2. method according to claim 1 is characterized in that, source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, inserts the residual time length that abandons timer of described PDCP SDU in this GTP-U extension header, comprising:
Source base station is inserted the information of this GTP-U extension header length of expression in prolate-headed first byte of described GTP-U, in prolate-headed last byte of described GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the information of the residual time length that abandons timer of corresponding PDCP SDU.
3. method according to claim 1 is characterized in that, UE switches to the process of target BS from source base station, and the PDCP SDU that source base station will send the described UE in the buffer memory is transmitted to target BS and specifically also comprises:
Source base station increases a GTP-U extension header in the GTP-U message corresponding with described PDCP SDU, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the serial number information of corresponding PDCP PDU.
4. the data forwarding system in the handoff procedure is characterized in that this system comprises source base station, target BS and UE; Wherein, UE is in from source base station under the state that target BS switches:
Source base station, be used for obtaining the residual time length that abandons timer of the PDCP SDU that sends buffer memory, according to the accessed residual time length that abandons timer, in the GTP-U message corresponding, increase a GTP-U extension header with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS;
Target BS, be used to receive the described prolate-headed GTP-U message of GTP-U that increased, GTP-U extension header in this GTP-U message is resolved, obtain the residual time length that abandons timer of the PDCP SDU corresponding, start new corresponding with this PDCP SDU timer that abandons according to the residual time length that abandons timer of this PDCP SDU with this GTP-U message.
5. system according to claim 4 is characterized in that source base station comprises the transmission cache module, adds a processing module and sending module, wherein:
Send cache module, be used for obtaining the residual time length that abandons timer of the PDCP SDU that sends buffer memory, the residual time length that abandons timer of the described PDCP SDU that gets access to is sent to add a processing module;
Add a processing module, be used to receive the residual time length that abandons timer that the transmission cache module sends described PDCPSDU, in the GTP-U message corresponding, increase a GTP-U extension header with described PDCP SDU, in this GTP-U extension header, insert the residual time length that abandons timer of described PDCP SDU, the described prolate-headed GTP-U message of GTP-U that increased is sent to sending module;
Sending module is used to receive the prolate-headed GTP-U message of GTP-U that added increase that processing module sends, and the described prolate-headed GTP-U message of GTP-U that increased is sent to target BS.
6. system according to claim 4 is characterized in that, target BS comprises receiver module, decaptitate parsing module and startup module, wherein:
Receiver module, the prolate-headed GTP-U message of GTP-U that has been used for increase that the reception sources base station sends sends to the parsing module of decaptitating with the described prolate-headed GTP-U message of GTP-U that increased;
The parsing module of decaptitating, the prolate-headed GTP-U message of GTP-U that has been used to receive increase that receiver module sends, the described prolate-headed GTP-U message of GTP-U that increased is carried out parse operation, obtain the residual time length that abandon timer corresponding, the more described residual time length that abandon timer corresponding with PDCP SDU sent to the startup module with described PDCP SDU;
Start module, be used for the residual time length that abandon timer corresponding that send according to the parsing module of decaptitating, start new corresponding with the described PDCP SDU timer that abandons with PDCP SDU.
7. system according to claim 5 is characterized in that,
Add a processing module, be used for increasing a GTP-U extension header in described GTP-U message, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the information of the residual time length that abandons timer of the described PDCP SDU of expression.
8. system according to claim 5 is characterized in that,
Add a processing module, be used for increasing another GTP-U extension header in described GTP-U message, in prolate-headed first byte of this GTP-U, insert the information of this GTP-U extension header length of expression, in prolate-headed last byte of this GTP-U, insert the information of this GTP-U extension header of indication next GTP-U extension header type afterwards, in remaining byte, insert the serial number information of corresponding PDCP PDU.
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