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Method and device for signaling interaction and layer reconstruction during handover

A switching process and signaling interaction technology, applied in wireless communication, electrical components, etc., can solve problems such as data cannot be transmitted correctly, PDCPSN and HFN maintenance are not synchronized, etc.

Active Publication Date: 2016-07-20
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 PDCPSN length is considered, but this set of flow is simply applied to the extended PDCPSN length handover scenario, which will cause the receiving end and the sending end to maintain PDCPSN and HFN. Not synchronized, resulting in incorrect transmission of subsequent data

Method used

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  • Method and device for signaling interaction and layer reconstruction during handover
  • Method and device for signaling interaction and layer reconstruction during handover
  • Method and device for signaling interaction and layer reconstruction during handover

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Experimental program
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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 PDCPSN. For the handover UE, the AM bearer of the UE is configured with the extended PDCPSN in the source cell and the target cell.

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

[0141] Extend the following field related to the PDCPSN size in the SNStatusTransfer 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, then The field length is 32768;

[0142]

[0143]

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

Embodiment 2

[0166] Embodiment 2: for scenario 1.

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

[0168] The feature of this embodiment is that no extension is made to the field related to the SN in the SNStatusTransfer signaling and the PDCPSN carried in the data structure of the GTP-U, 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 PDCPSN for the UE, and learns that the target eNB supports the extended PDCPSN 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 hand...

Embodiment 3

[0196] Embodiment 3: for scenario 2.

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

[0198] The feature of this embodiment is that the SN-related field in the SNStatusTransfer signaling and the PDCPSN carried in the GTP-U data structure can only be transferred in the original 12bitSN 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 PDCPSN for the UE;

[0201] Step 1: The source eNB receives the UE measurement report, or judges that the UE needs to be handed over th...

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Abstract

The embodiment of the present invention discloses a method and device for signaling interaction and layer reconstruction in the handover process, which relate to the field of wireless communication and are used to ensure that the terminal can be handed over after extending the length of the packet data aggregation protocol PDCP sequence number SN After the normal data transmission process. In this method, the source base station configures the PDCP SN or extended PDCP SN in the long-term evolution LTE system according to the confirmation mode AM bearer configuration of the source base station and the target base station for the terminal, generates SN status transmission signaling and forwarding data packets, and the target base station According to the source base station and the target base station, the AM bearer configuration of the terminal is the PDCP SN or the extended PDCP SN in the LTE system, and the received SN status transmission signaling and forwarding data packets are analyzed, thus ensuring that the terminal will Able to carry out normal data transfer process.

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 (UserEquipment, UE) side and the base station (eNB) side can be divided into a user plane and a control plane from the 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 (PDCP) layer of the user plane is mainly used to perform header compression (\decompression), encryption (\decryption) operations on the received data packets, and to shuffle the source eNB when handover occurs. The sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W36/30
Inventor 刘佳敏许芳丽
Owner DATANG MOBILE COMM EQUIP CO LTD
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