Method for selecting relay UE in D2D communication

A technology of target relay and signal quality, applied in the field of wireless communication, can solve problems such as no clear solution

Inactive Publication Date: 2017-04-19
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no clear solution on how to select a suitable relay UE (Relay UE) for the remote UE (Remote UE)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] First, after the relay UE authorizes and decides to act as a relay, it sends a discovery signal, and the discovery signal carries information such as the PLMN list of the serving cell where it is located, TAC, and its own mobility state information.

[0029] If the remote UE judges that it needs to find a relay UE, the remote UE obtains the information of the relay UE through the discovery information, and then uses the information to select a suitable relay for its own use, and measures the signal quality of these relays, that is, Signal quality on the PC5 interface, where the signal quality includes received power and signal quality of the signal on the PC5 interface. When the two are greater than a certain threshold m, it is determined that the relay may become a candidate relay UE of the remote UE, and the candidate relay UEs are sorted according to the receiving power of the candidate relay UEs.

[0030] Method 1: Select the relay UE whose ranking rises the fastest...

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PUM

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Abstract

The invention provides a method for selecting relay UE in D2D communication. The method comprises the following steps of through a discovery signal sent by the relay UE, acquiring relay UE information; selecting the relay UE satisfying an access demand and measuring signal quality of the discovery signal; selecting the relay UE whose signal quality is greater than a threshold 1as candidate relay UE; sorting the signal quality of the discovery signals of the candidate relay UE; and selecting the candidate relay UE whose sort is risen fastest and whose signal quality belongs to a first N rank as target relay UE, or selecting the candidate relay UE with the best signal quality as the target relay UE. In the invention, the relay UE can be reasonably selected and a ping-pong effect can be avoided during relay UE selection.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method for selecting a relay UE in D2D communication. Background technique [0002] With the development of wireless mobile communication technology, people put forward higher and higher requirements for high speed, low delay and low cost. The LTE (Long Term Evolution) project was born under such a background, pursuing higher peak rates and shorter transmission delays. [0003] The IMT-A system is allowed to support Device-to-Device (D2D) communication under the cellular network of the cell to improve spectrum utilization. Device-to-Device (D2D) communication is a new technology that allows terminals to communicate directly by reusing cell resources under the control of the system. It can increase the spectrum efficiency of the cellular communication system and reduce the terminal transmit power. To a certain extent, it solves the problem of lack of spectrum reso...

Claims

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Application Information

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IPC IPC(8): H04W40/12H04W40/22
CPCH04W40/12H04W40/22Y02D30/70
Inventor 王淑坤许瑞锋
Owner BEIJING XINWEI TELECOM TECH
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