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Method and apparatus for signaling interaction and layer reconstruction in switching process

A technology of handover process and signaling interaction, applied in wireless communication, electrical components, etc., can solve the problems of asynchronous maintenance of PDCPSN and HFN, and data cannot be transmitted correctly.

Active Publication Date: 2014-01-22
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the prior art, only the handover and processing flow under the original PDCP SN length is considered, but this set of flow is simply applied to the handover scenario of the extended PDCP SN length, which will cause the receiving end and the sending end to be confused about the PDCP SN and HFN maintenance is not synchronized, resulting in incorrect transmission of subsequent data

Method used

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  • Method and apparatus for signaling interaction and layer reconstruction in switching process
  • Method and apparatus for signaling interaction and layer reconstruction in switching process
  • Method and apparatus for signaling interaction and layer reconstruction in switching process

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Embodiment 1

[0138] Embodiment 1: For Scenario 1.

[0139] In this embodiment, both the source eNB and the target eNB can support the extended PDCP SN, and for the handover UE, the AM bearer of the UE is configured with the extended PDCP SN in the source cell and the target cell.

[0140] The feature of this embodiment is that the SN-related fields in the SN Status Transfer signaling and the PDCP SN carried in the GTP-U data structure are also extended accordingly, and the specific details are as follows:

[0141] Extend the following field related to the PDCP SN size in the SN Status Transfer signaling, where the number of extended bits depends on how many bits the SN is extended to. For example, if the SN is extended to 14 bits, the length of the field is 16384; if the SN is extended to 15 bits, the field length is 32768;

[0142]

[0143]

[0144] In addition, the GTP-U data structure used for forwarding data also needs to be extended accordingly. Among them, the GTP-U extension ...

Embodiment 2

[0166]Embodiment 2: for scenario 1.

[0167] In this embodiment, both the source eNB and the target eNB can support the extended PDCP SN, and for the handover UE, both the source cell and the target cell are configured with the extended PDCP SN for the AM bearer.

[0168] The feature of this embodiment is that no extension is made to the SN-related field in the SN Status Transfer signaling and the PDCP SN carried in the GTP-U data structure, and the original 12 bits are kept.

[0169] The behavior of the source eNB can be referred to as Figure 4 The second implementation manner of the shown source base station process is as follows:

[0170] Step 0: The source eNB configures the extended PDCP SN for the UE, and learns that the target eNB supports the extended PDCP SN during the interaction with the target eNB;

[0171] Step 1: The source eNB receives the UE measurement report, or judges that the UE needs to be handed over through the RRM algorithm, then sends a handover req...

Embodiment 3

[0196] Embodiment 3: for scenario 2.

[0197] In this embodiment, the source eNB supports extended PDCP SN, but the target eNB does not support extended PDCP SN, which is equivalent to switching from a large SN cell to a small SN cell. For the target cell, a 12-bit PDCP SN is configured for the AM bearer.

[0198] The feature of this embodiment is that the SN-related field in the SN Status Transfer signaling and the PDCP SN carried in the GTP-U data structure can only be transferred in the original 12-bit SN mode, that is, the extended form is not used .

[0199] The behavior of the source eNB can be referred to as Figure 4 The third implementation manner of the shown source base station process is as follows:

[0200] Step 0: The source eNB configures the extended PDCP SN for the UE;

[0201] Step 1: The source eNB receives the UE measurement report, or judges that the UE needs to be handed over through the RRM algorithm, then sends a handover request message to the targ...

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Abstract

The embodiments of the invention disclose a method and apparatus for signaling interaction and layer reconstruction in a switching process, and relate to the field of radio communications. The method and apparatus are used for ensuring a normal data transmission process after a terminal is switched after the length of the serial number (SN) of a packet data convergence protocol (PDCP) is expanded. In the method, a source base station, according to whether the acknowledged mode (AM) bearer of the terminal is configured by the source base station and a target base station with the PDCP SN of a long term evolution (LTE) system or an expanded PDCP SN, generates an SN state transmission signaling and a forwarding data packet; a target base station, according to whether the AM bearer of the terminal is configured by the source base station and the target base station with the PDCP SN of the long term evolution (LTE) system or the expanded PDCP SN, analyzing the received SN state transmission signaling and forwarding data packet so as to ensure that the normal data transmission process can be carried out after the terminal is switched.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for signaling interaction and layer reconstruction during handover. Background technique [0002] The protocol stack structure of the current Long Term Evolution (LTE) system is as follows: figure 1 shown. [0003] The protocol stacks at the user equipment (User Equipment, UE) side and the base station (eNB) side can be divided into a user plane and a control plane in a vertical direction. The control plane is used to transmit and process signaling, that is, signaling bearer. The user plane is used to transmit and process data streams, that is, data bearers. [0004] figure 1 Among them, the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer of the user plane is mainly used to perform header compression (\ decompression) and encryption (\ decryption) operations on the received data packets, as well as the The sour...

Claims

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Application Information

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IPC IPC(8): H04W36/00H04W36/30
Inventor 刘佳敏许芳丽
Owner DATANG MOBILE COMM EQUIP CO LTD
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