LTE系统中保证CCE分配公平性的算法

The Algorithm of Guarantee CCE AllocatedImpartially in LTE System

在LTE系统中,CCE是传输控制信息所用的物理资源,被上行调度和下行调度共用,若上行调度中所需CCE资源多并且调度快,那么下行调度中将没有或者只有很少的CCE资源可以使用,导致PDSCH中的RB浪费大,反过来PUSCH中RB浪费大。为了避免这个问题的发生,采取限制上下行调度中分配CCE的最大UE数目的方法来保证其公平性,同时提出计算上下行调度中分配CCE最大UE数目的算法,最后通过仿真证明该方法是可行的。

In LTE system, CCE （control channel element） is physical resource which transmits control information, it is used by uplink and downlink schedulers. If uplink schedule faster than downlink and it needs much CCE, then there is no or litter CCE providing to downlink, it must lead that resource blocks in PDSCH are wasted too many, whereas it also exists in PUSCH. To avoid this problem, a way is adopted to guarantee that CCE can be allocated impartially between uplink and downlink scheduler by restricting the maximum UE number which allocated in schedulers. It also provides the algorithm of calculating the maximum UE number to allocate CCE in uplink and downlink scheduler. The method is feasible via testified in an emulator.