两跳中继TDD-CDMA蜂窝网络容量分析

Capacity analysis of two-hop-relay TDD-CDMA cellular networks

为了增加传统TDD-CDMA蜂窝网络的上行链路容量,采用了两跳中继方式.在两跳中继蜂窝网络模型的基础上,提出了2种时隙调度方法:时隙同步调度与时隙反转调度.分析这2种方法下中继站和基站的小区内和小区间干扰情况,分别得到其在目标小区中的总干扰功率.通过数值计算,获得两跳中继TDD-CDMA蜂窝网络的上行链路容量闭合表达式,并讨论了2种调度方法对系统性能所产生的影响.实验结果表明,采用时隙同步调度方法时,目标小区内部区域可容纳更多用户;采用时隙反转调度方法时,目标小区外部区域可容纳更多用户.因此,时隙同步调度方法适用于小区内部区域负载较高、外部区域负载较低时的情况,而时隙反转调度方法则适用于小区内部区域负载较低、外部区域负载较高时的情况.

To increase the uplink capacity of traditional TDD-CDMA（time division duplex-code division multiple access） cellular netw orks,tw o-hop-relay is adopted.Based on the model of the tw ohop-relay cellular netw orks,tw o kinds of scheduling methods,time-slot synchronous scheduling and time-slot opposing scheduling,are introduced.By analyzing the interference of the intracell and intercell of RSs（relay stations） and BSs（base stations）,the overall interference pow er of the targeted cell can be obtained by using these tw o scheduling methods.Then,the closed form expressions of the uplink capacity of tw o-hop-relay TDD-CDMA cellular netw orks are obtained by mathematical calculation,and the impact of these tw o scheduling methods on system’s performance is discussed.The experimental results show that w hen using the time-slot synchronous scheduling method,the inner regions of targeted cell can accommodate more users;w hen using the time-slot opposing scheduling method,the outer regions of targeted cell can accommodate more users.Therefore,the timeslot synchronous scheduling method is suitable for higher load of inner regions and low er load of outer regions,w hile the time-slot opposing scheduling method is suitable for low er load of inner regions and higher load of outer regions.