Protection method and system for X2 interface switching

Abstract

The invention provides a protection method for X2 interface switching, which comprises the following steps: S202. an X2 Interface Application Protocol receives a user equipment context release message of an X2 interface control surface, or a Packet Data Convergence Protocol reversely completes one of multiple messages and waits for another message; and S204. an endmarker protection timer is arranged in a target base station through the Packet Data Convergence Protocol, and then started. The method and system provided by the invention solve the problem of redundant cache data, shorten the time delay of the switching service interruption, and enhance the user experience.

Description

technical field [0001] The invention relates to the communication field, in particular to a protection method and system for X2 interface switching. Background technique [0002] The GPRS tunneling protocol for the userplane (referred to as GTP-U) packet at the user level is carried by the user data protocol (referred to as UDP) protocol data unit (referred to as PDU). The packet is not transmitted reliably, and the "end marker" data packet used for GTP-U control may be lost during transmission. The process description in the 36.300 protocol recommends sending the "end marker" multiple times, but it cannot be solved fundamentally "end marker" missing problem. [0003] Now, refer to figure 2 Describe the existing protocol and describe the related processing of "end marker" in X2 interface handover. [0004] Specifically, the source base station "end marker" processing flow is as follows: the user plane packet data convergence protocol (PDCP for short) receives the GTP-U "e...

AI Technical Summary

Problems solved by technology

[0007] First, the GTP-U "end marker" sent by the SGW of the core network to the source base station is lost, and the user plane of the source base station cannot receive the GTP-U "end marker", and the resources corresponding to the user's X2 interface switching bearer will not be deleted. , but the user's X2 interface resources actually have no switching data to transmit, thus causing a waste of resources

When the X2 interface AP receives the UE CONTEXT RELEASE message from the X2 interface control plane, it cannot judge the completion of the user plane data switchover, making normal user resource deletion impossible

[0008] Secondly, the "end marker" sent by the source base station to the target base station on the switching bearer is lost, and the resources on the user's X2 interface of the target base station cannot be deleted, thus wasting the X2 interface AP user resources and X2 interface transmission resources of the target base station's X2 interface

In addition, the PDCP of the target base station has not received the "end marker" of the source base station, and will not forward the received downlink data sent from the SGW of the core network to the UE that has successfully connected, so that the PDCP cached data cannot be sent normally. For the UE, the PDCP memory of the target base station is excessively occupied, the handover service interruption delay is long, and the user experience is poor.

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