【摘要】 基于D BMAP/D/ 1排队模型分析GPRS数据业务在简化的一步接入模式以及不同服务速率下的性能 ,包括RLC/MAC缓冲区队列的平均长度、小分组 (Mini Packet)的平均时延和丢弃率等 .分析结果表明 :当定时器T3 182 时间变长时 ,时延缩短 ,丢弃率降低 ;处于空闲状态的移动台产生新会话的概率越大 ,时延越长 ;缓冲区容量增加 ,丢弃率明显降低 .但是随着每个会话中分组呼叫数目的变化 ,时延变化不显著 .更多还原

【Abstract】 A D-BMAP/D/1 queuing model is applied to analyzing the performance of GPRS data services,such as mean RLC/MAC queue length,mean delay and loss rate of mini-packets,in which a simplified one-phase access procedure and different service rate are taken into account.The analysis results show that:Delay and loss rate are reduced with longer timer T 3182;Delay is increased under the greater probability with which mobile station in the idle state generates new session;Loss rate is decreased with larger buffer size.But delay is changed unclearly with the number of packet calls in a session.更多还原