基于用户中断概率的D2D通信干扰协调与资源分配

在LTE系统中引入设备直传(D2D)通信技术,会因为D2D用户复用蜂窝用户资源进行通信而产生同频干扰.在现有的干扰协调与资源分配研究中,都需要基站获取各个通信链路的信道状态信息(CSI),但这样无疑会增加基站的信令负担.为减小干扰与基站的信令负担,提出了一种基于用户中断概率的干扰协调与资源分配算法,首先在保证蜂窝用户正常通信的情况下,通过限制D2D用户到基站间的距离来降低干扰;其次通过遍历所有蜂窝用户的频谱资源,选择能使D2D用户的总中断概率最低的频谱资源进行复用.仿真结果表明,所提算法能够在保证蜂窝用户正常通信的情况下,明显降低D2D用户的平均中断概率,同时还能够降低基站信令负担.

Outage probability-based interference coordination and resource allocation for D2D communications

The introduction of device-to-device(D2D) communication which communicates with each oth-er by resuing the resource of cellular users in the LTE system will generate mutual interference between cellular users and D2D users. The existing researches on interference coordination and resource allocation require the base station to collect the channel state information( CSI) of each related communication link, which will increase the complexity and signaling overhead of the system. To solve the problem and reduce the mutual interference, an outage probability-based interference coordination and resource allocation method is proposed in this paper,which does not need the CSI. Firstly,in the case of the normal communi-cation of cellular users,the interference from D2D users can be reduced by restricting the distance between D2D users and the base station. Secondly,by traversing the spectrum resources of all the cellular users,al-location resources are chosen for D2D users that can communicate with D2D under the principle of minimi-zing the outage probability of D2D users. Simulation results show that the proposed scheme can significant-ly decrease the average outage probability of D2D users compared with other schemes and also reduce the signaling burden of the base station.