一种适用于无线网络中多媒体传输的CDMA/RTDMA协议及性能分析  

PERFORMANCE OF A JOINT CDMA/RTDMA PROTOCOL FOR MULTIMEDIA TRANSMISSION IN WIRELESS NETWORK

作　　者：陆晓文[1] 吕冰[1] 周武旸[1] 朱近康[1] 

机构地区：[1]中国科技大学个人通信与扩频通信实验室,合肥230027

出　　处：《电子与信息学报》2002年第12期1800-1807,共8页Journal of Electronics & Information Technology

基　　金：973项目资助

摘　　要：该文研究了一种在扩频分组无线网中适合多媒体传输的MAC协议—CDMA/RTDMA。它在RTDMA的基础上,将基站可分配的资源从时隙扩展为码字-时隙,从而增加了系统的容量,更有效地支持多媒体业务的传输。文章分别通过M/M/n/m排队模型和相位过程来分析话音的丢包率和数据的延迟。通过数值计算和计算机仿真,相对于原有的RTDMA方式,这种新的MAC协议在网络负载较重的情况下,仍能保证多种业务的QoS要求。In this paper a novel joint CDMA/RTDMA MAC for multimedia transmission in wireless network is studied. In this scheme, the resource unit allocated by the base station is changed from a slot to a code-slot. Thus it enhances the system's capacity and can support multi-media service more efficiently. The voice packet dropping probability and data delay are analyzed through M/M /n/m model and phase process respectively. Compared to the original RTDMA, this new MAC protocol can provide multiple services' QoS even under the heavy load.

关 键 词：无线网络 多媒体传输 CDMA/RTDMA协议 M/M/n/m排队模型 相位过程 QOS 服务质量 

分 类 号：TN929.5[电子电信—通信与信息系统]