Handover method, device and system in wireless communication system

A communication method and communication system technology, applied in the field of handover methods, devices and systems in wireless communication systems, can solve the problems of large delay and reduce user experience of delay-sensitive services, etc.

Active Publication Date: 2021-10-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the above handover process, the data packet forwarding between the source base station and the target base station will cause delay, especially when the backhaul between base stations is not ideal, the delay is large, which reduces the user experience of delay-sensitive services

Method used

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  • Handover method, device and system in wireless communication system
  • Handover method, device and system in wireless communication system
  • Handover method, device and system in wireless communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] This embodiment provides a communication method, device and system. This program can be applied to figure 1 system shown. like figure 2 Shown:

[0070] Step 201, the source base station sends a handover request message to the target base station.

[0071] In this embodiment, when the source base station determines that the UE needs to be handed over from the source base station to the target base station, it sends a handover request message to the target base station to request handover of the UE to the target base station.

[0072] Step 202, the target base station, in response to the handover request message, sends a request message to the first core network device to request a copy of the first data packet, and the first data packet is sent by the second core network device to the source base station A data packet sent for the user equipment UE.

[0073] Optionally, the first core network device may be an Access and Mobility Management Function (Access and Mobi...

Embodiment 2

[0099] During the handover process, for downlink data transmission, after the core network device starts the duplication process, the UPF device can send a data packet to the source base station, and send a copy of the data packet to the target base station. The source base station sends the data packet received from the UPF device to the user equipment, and the target base station sends the data packet received from the UPF device to the user equipment, after the UE receives the data packet from the source base station and the target base station respectively, it needs to The data packets received at the source base station and the target base station perform operations such as repeated packet detection, data packet reordering, and / or in-order delivery, so that the UE can correctly perform repeated packet detection or data packet reordering or in-order delivery.

[0100] Those skilled in the art can understand that in this application, the source base station or the target bas...

Embodiment approach

[0116] method one:

[0117] The first indication information includes the value of the first index and the value of the second index corresponding to the first index.

[0118] For example, the GTP-US SN carried in the data packet received by the source base station from the UPF device is 1, and the source base station determines that the PDCP SN corresponding to the data packet is 2 according to the current data transmission situation, then the first indication information indicates The mapping relationship of can be shown in Table 1 below.

[0119] Table 1

[0120] DL GTP-U SN DL PDCP SN 1 2

[0121] The first indication information includes DL {GTP-U SN, PDCP SN}. The order of the GTP-U SN and the PDCP SN can be interchanged, for example, as shown in Table 2, which is not limited in this embodiment of the present invention.

[0122] Table 2

[0123] DL PDCP SN DL GTP-U SN 2 1

[0124] The specific values ​​of the GTP-U SN and t...

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Abstract

The present application provides a handover method, device and system in a wireless communication system. The source base station receives the first data packet from the core network device; the target base station receives the second data packet from the core network device, the second data packet is a copy of the first data packet, and the first The data packet and the second data packet respectively include a first index; the source base station sends first indication information to the target base station, and the first indication information indicates a mapping relationship between the first index and the second index; The source base station, in response to the first data packet, sends a third data packet to the user equipment UE; the target base station, in response to the second data packet, sends a fourth data packet to the UE, the The third data packet and the fourth data packet respectively include the second index.

Description

technical field [0001] The present application relates to the technical field of communication, and in particular to a handover method, device and system in a wireless communication system. Background technique [0002] In a mobile communication system, as the user equipment (UE) moves, the network switches the user equipment from the source cell to the target cell for data transmission through the handover process, and the source base station sends a handover command to the user equipment over the air interface After that, the uplink and downlink data transmission to the user equipment is stopped, and then, the source base station sends a sequence number status transfer (sequence number status transfer) message to the target base station and forwards the data packet (data forwarding) to the target base station, for example, for uplink, the source The base station forwards the received out-of-order uplink data packets (starting from the first out-of-order UL data packet, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W36/08
CPCH04W36/0055H04W36/08H04W36/026H04W76/22H04W36/02H04W36/06H04W76/12H04W36/0016H04W36/0022H04W36/0061
Inventor 严乐张宏平曾清海耿婷婷胡星星
Owner HUAWEI TECH CO LTD
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