无冲突NC-IPRMA协议下的数据─话音综合

Integration of Data and Speech over Non-Collision Integrated Packet Reservation Multiple Access Protocol

提出了一个面向微蜂窝通信的支持数据─话音综合业务的无冲突分组预约多址协议─—NC-IPRMA协议，通过M／M／N／／M．排队模型分析了NC-IPRMA协议的话音子系统性能，通过系统仿真分析了数据一话音综合性能。研究结果表明，在支持数据─话音综合业务方面，NC-IPRMA协议比PRMA和IPRMA协议更高效，这包括更高的信道利用率，更短的数据分组时延和更大的话音终端容量。由于采用排队等待方式接入时隙信道，NC-IPRMA协议彻底消除了以竞争方式接入信道的PRMA协议（及其各种改进方案）存在的重负荷下的不稳定问题。

A Non-Collision Integrated Packet Reservation Multiple Access protocol which efficiently accommodates integrated data and speech services is proposed for microcellular mobile communications.The performance of speech subsystem of the NC-IPRMA system is analyzed by means of the queueing model of M/M/N/~/Ms,while the overall performance of NC-IPRMA system is investigated using computer simulation.The result indicates that the NC-IPRMA protocol has a better overall performance than the PRMA and IPRMA in supporting integrated speech and data services,for instance,a higher throughput,a shorter data packet delay and more simultaneous conversations.Since the NC-IPRMA adopts a queueing mode to access time slot channels,it completely resolves the instability that pushes the system adopting a contending mode to access channels into a severe congestion state under heavy load.