It can reduces Base Station's burden effectively when apply D2D technology to LTE network in many specific communication scene, but when the D2D communication users and cellular users sharing the same spectrum resources, D2D communication will cause interference to cellular communication. In this paper, we propose a interference avoidance scheme for relay-based D2D communication system, first reach a relay trigger condition of D2D communication through the analyze of outage probability, and then the relay selection algorithm that based on optimal capacity is proposed. Simulations demonstrate that, compared with traditional cellular communication, D2D communication with relay can make full use of the idle resource of the cell so as to increase the user capacity effectively and as to improve system performance as well.
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