Connection management method and device for D2D (Device-to-Device) relay communication, terminal and base station

Abstract

The invention provides a connection management method and device for D2D (Device-to-Device) relay communication, a terminal and a base station. The connection management method for the D2D relay communication comprises the steps: when an RRC (Radio Resource Control) connection between a far-end terminal in network coverage and the base station is not released, judging whether a relay terminal for the D2D relay communication is selected or not; when the condition that the relay terminal is selected is judged, determining whether the RRC connection between the far-end terminal and the base station can be released or not according to a resource allocation mode used when the far-end terminal carries out D2D communication. According to the technical scheme provided by the invention, the problems of state transition and connection management of UE (User Equipment) in the D2D relay communication are solved, and the problem that the utilization ratio of D2D communication resources is decreased due to the fact that the far-end terminal in coverage is switched to an idle state when the collocation of resource pools is deficient and scheduling resources are relatively more is avoided.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular, to a connection management method in D2D relay communication, a connection management device in D2D relay communication, a terminal and a base station. Background technique [0002] 3GPP Release 13 began to introduce the discussion of partial coverage scenarios, and introduced D2D (Device-to-Device, device-to-device, which is a direct communication technology between devices introduced by 3GPP Release 12, which is realized by introducing a secondary link instead of the cellular network system. Uplink and downlink are used to realize the concept of relay), that is, two or more terminals performing D2D communication, some are located within the network coverage, and some are located outside the network coverage. Specific as figure 1 Shown is a schematic diagram of a partial coverage scenario. In this schematic diagram, a relay UE (User Equipment, user equipment) can...

AI Technical Summary

Problems solved by technology

Therefore, such UE state transition limits the resource flexibility of the remote UE when performing D2D communication.

Especially when the resource pool configuration is insufficient and there are many scheduling resources, it will lead to a decrease in the utilization rate of D2D communication resources.

[0004] Therefore, how to solve the state transition and connection management problems of remote terminals within the coverage, so as to avoid the low utilization rate of D2D communication resources, has become an urgent technical problem to be solved

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