时隙ALOHA系统稳定性分析*

研究了基于非对称多包接收模型的时隙ALOHA随机接入系统的稳定性。引入了非对称多包接收(MPR)模型,计算了媒体接入控制(MAC)容量区域,得到了两用户系统ALOHA稳定区域的详细特征。结果表明,随着MPR容量的提高,稳定区域从凹形区域变化到凸形区域,ALOHA稳定区域与MAC容量区域是一致的,而且当发送概率为1时,系统不需要传输控制,即对于两用户捕获信道而言,发送概率为1的ALOHA系统稳定性是最优的。

Analysis of stability of slotted ALOHA system

The stability of slotted ALOHA random-access systems based on asymmetric multipacket reception was approached.The asymmetric multipacket reception(MPR) model was applied and the medium access control(MAC) capacity region was calculated.An explicit characterization of the ALOHA stability region for the two-user system was given.Results show that the stability region changes from a concave region to a convex region as the MPR capability improves,and the ALOHA stability region coincides with the MAC capacity region.Further,there is no need for transmission control when ALOHA transmission probability is one.That is,ALOHA with transmission probability one is optimal for stability in the two-user capture channel.