D2D (Device-to-Device) relaying communication method and device and terminal

Abstract

The invention provides a D2D relaying communication method and device and a terminal. The D2D relaying communication method comprises steps as follows: obtaining the service cell information of to-be-selected at least one relaying terminal by a remote terminal, wherein the remote terminal is located in a network coverage range and builds an RRC (Radio Resource Control) connection with a base state; and selecting a relaying terminal for D2D relaying communication according to the current service cell information of the remote terminal and the service cell information of the at least one relaying terminal. According to the technical solution provided by the invention, the remote UE is ensured to select the most suitable relaying UE; the vicious circle problem resulted from blindly switching the service cell by the remote UE is avoided; and the problem of coordinating relaying selection and cell switching by the remote UE in a connection state in the D2D relaying communication is effectively solved.

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 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 establish an RRC (Radio Resource Control, radio resource co...

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

Images