Switch control method and device

Abstract

This patent application provides a switching control method and device. The method includes: the source base station sends a message for instructing handover to the terminal equipment, the message includes at least one downlink first unconfirmed PDCP SDU information; the source base station forwards to the target base station during the handover process of the terminal equipment Correctly received PDCP SDU of at least one source DRB; after the terminal device completes handover and access to the target base station, the target base station retransmits to the terminal device the SN indicated by at least one downlink first unconfirmed PDCP SDU information that is not confirmed by the terminal device The downlink PDCP SDU of at least one source DRB received correctly by the terminal device. Through the switching control method of the present application, the lossless switching of the terminal equipment during the moving process is realized, and the service quality of the service of the terminal equipment during the switching process is effectively guaranteed.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a switching control method and device. Background technique [0002] In the Long Term Evolution (LTE) system, the data plane protocol layer of the air interface includes packet data convergence protocol (PDCP) layer, radio link control (radio link control, RLC), Media access control (media access control, MAC) layer and physical (PHY) layer. For the downlink data packet, the core network equipment filters the data packet according to its quality of service (QoS) attribute and maps it to a bearer, and then transmits it to the base station, and the base station then sends the data packet to the terminal device with the same bearer. [0003] With the rapid development of wireless communication technology, the fifth generation (5th Generation, 5G) wireless communication technology has become a hot spot in the industry at present. A new service data adaptation protocol ...

AI Technical Summary

Problems solved by technology

Due to SN reconfiguration, some data packets sent by the source base station to the terminal device before the handover and not correctly received by the terminal device cannot be retransmitted to the terminal device at the target base station, causing the terminal device to lose data packets during the handover process

In another case, when the configurations of the source base station and the target base station are different, for example, the protocol versions supported by the source base station and the target base station are different, so that the target base station cannot recognize some configuration information of the source base station, which will also cause the target base station to switch the terminal equipment Afterwards, the SN of all data packets processed by the PDCP entity communicated with the target base station is reconfigured, also known as full configuration (full configuration)

In this case, it will also cause the end device to lose packets during the handover process

[0006] There is currently no suitable solution for how to realize the lossless handover of the terminal equipment in the above scenario and ensure that the terminal equipment does not lose data packets during the handover process.

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