基于组播传输的Small Cell网络缓存放置研究

Caching placement of small cell network based on multicast transmission

Small Cell是一种低发射功率、小范围覆盖的基站。Small Cell作为3G/4G宏蜂窝的补充,能够使运营商以更低的代价为用户提供更好的无线宽带语音及数据业务。为了减少用户与蜂窝网络请求内容的流量,基于小基站文件流行度的缓存放置方案成为一种常见的解决方法。设计的缓存放置方案考虑到运营商能在一个服务周期内用单个组播服务多个用户对同一文件的请求,这比用多次单播耗费更少的能量。实验结果表明,设计的方案与现有的研究方案相比能量效率更高。

Small cell is a base station with low transmit power and small coverage. Small Cell as a complement to the 3G/4G macrocell,enable operators to provide users with better wireless broadband voice and data services at a lower cost. In order to reduce the traffic of requests between users and cellular networks,the cache placement scheme based on the popularity of small base stations becomes a common solution. In this paper,a new method of cache placement is proposed. The cache policy carefully takes into account the fact that an operator can serve the requests for the same file that happen at nearby times via a single multicast transmission. The strategy is more economical in traffic than the schemes based on unicast transmission and popularity of files. The experimental results show that the proposed solution is more effective than the existing methods.