面向4G OFDMA系统的新型切换策略

In 4G, with the increasing of high speed services, the channel resource occupied by single user is more and more. If using the traditional handover strategies, one-off resource allocating is so rigid to remained resource of the target cell, in addition, the soft handover occupied many cells’ resources bring a lot of additional load to the system. To solve these two problems, a new handover strategy is brought forward in this paper, and the strategy is cooperative handover. In the cooperative handover, a new resource using strategy is brought forward. Instead of one-off resource allocation in target cell and release in serving cell, resource of target cell replaces resource of serving cell in several gaps, the speed of resource replacing is decided by the Channel status. Before the handover process is finished, the handover user is in cooperative transmission state connecting with both the target cell and the serving cell, and the total resource occupied is same as normal state. The proposed handover scheme can solve the problems and the simulation results indicate that the system performance is improved after using CHO strategy.