Switching control method and device

Abstract

The invention provides a switching control method and device. The method comprises the following steps: the source base station sends a message used for instruction switching to terminal equipment, wherein the message includes at least one downlink first unacknowledged PDCP SDU information; the source base station sends the PDCP SDU of at least one source DRB which is not sequentially and correctly received by the terminal equipment to the target base station in the switching process of the terminal equipment; and after the terminal equipment completes the switching access to the target base station, the target base station resends the downlink PDCP SDU of the at least one source DRB which is not correctly received by the terminal equipment and starts from the SN and is indicated by at least one downlink first unacknowledged PDCP SDU information to the terminal equipment. With application of the switching control method, lossless switching of the terminal equipment in the moving process can be realized, and the business service quality of the terminal equipment in the switching process can be 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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