D2D communication resource multiplex selection method, base station and terminal

Abstract

The invention provides a D2D communication resource multiplex selection method, a base station and a terminal. The method comprises steps that whether interference caused by completely multiplexing frequency spectrum resources of a cellular user carried out by a D2D user can cause CQI grade drop of the cellular user is sequentially determined by the base station; if not, the frequency spectrum resources of the corresponding cellular user is selected for the D2D user to carry out multiplex; if yes, emission powers of the D2D user and the cellular user can be sequentially calculated according to corresponding signal-to-noise ratio threshold, and the frequency spectrum resources of the corresponding cellular user is selected to carry out multiplex for the D2D user when increment sum of emission powers of the D2D user and the cellular user is the smallest. The method is advantaged in that access probability of the D2D user and power efficiency of the cellular user and D2D communication are substantially improved on the condition that cellular network quality can be guaranteed.

Description

technical field [0001] The present invention relates to the communication field, and relates to a method for multiplexing and selecting D2D communication resources, a base station, and a terminal. Background technique [0002] Device to Device (D2D for short) refers to a new type of wireless network that establishes a communication link between terminal devices for direct communication without affecting the operation of the overall cellular network and does not pass through a base station. transmission technology. By introducing D2D technology, the burden on the base station can be reduced, the transmission delay can be reduced, and the spectrum utilization rate can be improved. To a certain extent, the problem of lack of spectrum resources in the wireless communication system can be solved, and the performance of the cellular network can be further improved. [0003] In a cellular network that supports D2D functions, users can communicate in three different modes: co-chann...

AI Technical Summary

Problems solved by technology

In the existing interference-tolerant schemes, for D2D users, they can only passively accept the tolerable interference value of the cellular wireless environment, and cannot adjust D2D user transmission power and multiplexing resources according to D2D user needs.

On the one hand, the link quality of D2D communication is limited from the root, and the advantages of D2D short-distance communication cannot be fully utilized; on the other hand, when the number of network users is large and the network interference environment is complex, the tolerable interference of cellular communication links If the value is reduced, then due to the limitation of the interference threshold, the number of users who can perform direct communication through the reuse of cellular network resources will decrease, and the probability of D2D link establishment will decrease.

For cellular users, receivers in cellular communication can only passively tolerate the interference caused by D2D users to themselves, resulting in the degradation of cellular link communication quality

In the existing power compensation scheme, the power increase is constant, and real-time power compensation is not performed according to the actual interference state of the user, which will inevitably cause unnecessary waste of transmit power

At the same time, although power compensation has been performed, problems similar to interference-tolerant solutions still inevitably arise, that is, they cannot meet the communication needs of D2D users.

In practical applications, if the above interference management scheme is simply applied, when the interference of the D2D link on the cellular link exceeds a certain threshold, the system will reject the access of the D2D link, resulting in a decrease in the access probability of the D2D user.

How to support as many users as possible to access the network in D2D mode is a major challenge for interference management

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