C-RAN环境下MBSFN网络切片的形成

通过分析MBSFN系统结构,提出了C-RAN及CU/DU分离环境下的MBSFN网络切片架构,对切片的基础设施与虚拟网络划分、基于CU//DU分离的协议及信道划分、主要通信过程以及切片的功能实体和性能做了详细讨论。基于提出的CU-DU-RRU三层可重配切片架构,提出了一种低代价的基于距离的位置更新机制,将MCE控制的小区列表更新TAL转变为MCE辅助的RRU控制、基于距离测量的搜索和更新,克服了MCE完全控制导致的搜索次数和信令开销较大的缺点。建立MARKOV模型对机制进行了性能分析,仿真表明,在搜索次数和信令开销两方面均优于LTE中的TAL机制,进而说明所提出的MBSFN网络切片架构的合理性。

MBSFN Network Slice Providing under C-RAN

By analyzing the MBSFN system structure,this paper proposes a three-layer reconfigurable architecture of MBSFN network slice in the C-RAN and CU/DU separation environment.The division between slice infrastructure and virtual network,the partition of CU/DU separation-based protocol and the allocation of logical channel,the main communication process,the functional entities and performance of slices are discussed in detail.Based on the CU-DU-RRU three-layer reconfigurable slice architecture in this paper,a low-cost distance-based location updating strategy is proposed.Searching user and updating location in this strategy is done by RRU and aided by MCE based on the distance changed from the cell listing,which avoid the more searching times and bigger overhead resulted by MCE’s only finishing all that.The performance of this strategy is addressed based on MARKOV link.The simulation results shows that the mechanism is better than the time-based TAL mechanism in LTE,in searching times and signaling overheads..This demonstrate the MBSFN slice framework in this paper is reasonable.