Method, device and terminal for d2d relay communication

Abstract

The present invention provides a method, device, and terminal for D2D relay communication, wherein, the method for D2D relay communication includes: a remote terminal that is within the network coverage and establishes an RRC connection with a base station acquires at least one The serving cell information of the relay terminal; according to the current serving cell information of the remote terminal and the serving cell information of the at least one relay terminal, select a relay terminal for D2D relay communication. The technical solution of the present invention can ensure that the remote UE selects the most suitable relay UE, avoids the vicious circle problem caused by the remote UE blindly switching the serving cell, and effectively solves the problem of the remote UE in the connected state in the D2D relay communication. End UE coordinates relay selection and cell handover issues.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular, to a method for D2D relay communication, a device for D2D relay communication and a terminal. 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 the direct communication technology between devices introduced in 3GPP Release 12, which is realized by introducing secondary links instead of The uplink and downlink of the cellular network system 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 relaying UE (User Equipment, user equipment) can establish an RRC (Radio Resource Control, radio resource cont...

AI Technical Summary

Problems solved by technology

If the remote UE reselects a relay UE, and the relay UE is located in another serving cell (that is, it is in a different serving cell from the remote UE), does the remote UE in the connected state need to switch the serving cell? There will be the following problem: if the remote UE does not switch the serving cell, when the current serving base station schedules D2D transmission resources for the remote UE, it needs to perform cross-cell resource coordination with the serving base station of the relay UE, and this cross-cell Compared with the same cell, the efficiency of resource negotiation will inevitably decrease; if the serving cell is switched, it will bring about the switching accompanied by the relay selection, and the relay switching may cause the remote UE to switch the serving cell again, which will further cause cause a vicious circle

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