Method and system for repeating data during switching course

A technology for switching processes and data, applied in the field of communication, can solve problems such as large delays, and achieve the effects of reducing delays, ensuring reliability, and reducing complexity

Active Publication Date: 2008-02-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The present invention provides a method and system for forwarding data in the handover process, which is used to solve the problem of relatively large time delay caused by downlink data forwarding in the current handover process

Method used

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  • Method and system for repeating data during switching course
  • Method and system for repeating data during switching course
  • Method and system for repeating data during switching course

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0100] Method example 1: a combination of the above-mentioned method 11, method 21 and method 31.

[0101] L11. When the source eNodeB receives the handover confirmation from the target eNodeB or the source eNodeB sends a handover command to the user side, the source eNodeB will, according to the order in which it is received, select the SDUs that are not correctly confirmed by the user side or start from the first SDU that is not correctly confirmed by the user side The SDU is forwarded to the target eNodeB. At the same time, the last SDU forwarded is identified through the transmission network; or, a timer is set on the target eNodeB side, and if an SDU is not received within the time limit, the target eNodeB determines the arrival of the forwarding data node accordingly.

[0102] L12. The target eNodeB generates a corresponding RLC entity to buffer the received SDU. After receiving the handover confirmation or synchronization information from the user side, the user plane ...

example 2

[0110] Method example 2: a combination of the above-mentioned method 12, method 21 and method 32.

[0111] L21 and L22 are the same as L11 and L12.

[0112] L23. In the process of sending the SDU to the user side, the target eNodeB adds an indication bit to the packet header of the last PDU of each SDU forwarded; or identifies the last PDU of each SDU forwarded by explicit signaling.

[0113] L24 is the same as L14.

[0114] L25 is the same as L15.

[0115] L26. When the RLC on the user side submits the SDUs corresponding to the identified PDUs to the PDCP layer or ends the RLC sorting, it notifies the PDCP layer that the out-of-order reception is completed, and submits the subsequent received SDUs in order; that is, the unidentified PDUs are correctly received. Afterwards, the user side delivers the SDUs corresponding to the PDU number greater than or equal to the unidentified PDU number N in the RLC receiving buffer in order, and must wait until the PDU with the PDU number...

example 3

[0118] Method Example 3: Combination of the above method 11, method 22 and method 34.

[0119] L31 to L34 are the same as L11 to L14.

[0120] L35. The RLC on the user side caches the PDUs sent by the target eNodeB and sorts them according to the PDU numbers. When the RLC on the user side receives the identified PDUs correctly, it performs SDU verification on the cached PDUs (that is, the PDU whose number is less than or equal to the identified PDU number All PDUs of N perform SDU detection), and then submit the SDUs corresponding to the numbers whose numbers are less than or equal to the identified PDUs to the PDCP layer. SDUs corresponding to PDUs with numbers greater than N are delivered sequentially.

[0121]L36. After the RLC on the user side submits the verified SDU to the PDCP layer, it notifies the PDCP layer that data forwarding is over, and submits the subsequently received SDUs in sequence.

[0122] L37. The PDCP layer performs reordering according to the PDCP num...

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Abstract

This invention discloses a method and a system for transmitted data in a switch process including: a source eNodeB transmits SDU to a target eNodeB in order and tells it an end point of the transmitted data, the target eNodeB transmits the received SDU to user side according to the receiving sequence and tells it the end point of the transmitted data, the user side RLC delivers the received SDU to PDCP layer of the user side and tells it the end point of the transmitted data, the PDCP layer sequences SDU before the end point of the transmitted data with PDCP number and delivers it to a higher level, which can reduce time delay brought with transmission of down-line data.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for forwarding data during switching. Background technique [0002] WCDMA research started in the early 1990s. From 1998 to now, the technical specifications of the WCDMA system have gone through the stages of Release 99, Release 4, Release 5, and Release 6. The current release 7 Standardization work has already started. At the same time, the longer-term LTE (Long Term Evolution) research has gradually become a new focus of standardization work. [0003] In the Release 99 system, the downlink transmission uses a dedicated channel, and its maximum rate can reach 384kbps. Starting from Release 4, MSC (Mobile Service Switch Center) is split into MSC Server and MGW (Multi-media GateWay), thereby separating control and business. In Release 5, the concept of IMS (IP Multi-media Subsystem) was introduced, which is based on the IP transport layer, and HSDPA (High ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04L12/54H04L29/06H04W28/06
CPCH04L12/66H04W28/06
Inventor 邵飞郑潇潇
Owner HUAWEI TECH CO LTD
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