基于OWC的越区切换算法和资源分配策略

A Cell Handover Algorithm and Resource Allocation Strategy Research Based on OWC System

摘要:

无线光通信(Optical Wireless Communication,OWC)是一种新型短距离无线通信技术。为了保证移动用户在多个LED服务区域间的持续通信,提出一种均衡通信速度和通信距离的越区切换算法。在该算法中,移动用户将选择通信距离尽可能长的小区来保证较长的通信时间,同时算法也将用户的移动方向考虑在内,并研究了在多用户情况下,通信网络的资源分配和调度策略,以保证接入网络的用户数量增多时,网络通信不受影响。仿真结果表明,切换算法有效地降低了用户的切换频率和通信中断率,并且提高了系统吞吐量;多小区协作网络下采用首入首出(First Input First Output,FIFO)的全局分配策略,提高了小区的平均利用率。

Abstract:

Optical wireless communication (OWC) is a new shortrange and highspeed wireless communication technology. In order to ensure the continuous communication among mobile users across multiple LED service areas, proposed is a cell handover algorithm which is a tradeoff between communication speed and distance. In the algorithm, mobile users will select the cell as far as possible to ensure a longer communication time, also it takes the users moving direction into account. In addition, the resource allocation and scheduling strategy were analyzed under the multiuser case, so as to ensure the network communication will not be affected as the number of users accessing the network increases. Simulation results show that the handover algorithm not only effectively reduces the switching frequency and communication interruption rate, but also improves the system throughput. In the multicell cooperative network, global allocation strategy of FIFO (First Input First Output) improves the average utilization rate of cells obviously.