考虑位置更新失败的呼叫阻塞率分析

Analysis on the Call Blocking Probability Considering Location Update Failure

针对位置更新失败会导致呼叫发生阻塞、降低网络的性能,分析了位置更新失败对呼叫性能的影响.给出在移动台的呼叫到达时间间隔服从指数分布、移动台在各位置区驻留时间服从一般概率分布条件下的呼叫阻塞率计算公式.理论分析结果表明,下一次呼叫阻塞率不仅和位置更新失败率、呼叫移动比有关,还与前一次呼叫状态有关.数值仿真结果表明,前一次呼叫状态不同时,呼叫移动比对下一次呼叫阻塞率的影响不同.根据分析结果选择合适的位置更新策略能降低下一次呼叫阻塞率.

In case of failed location update, a significant consequence is the incapability when establishing the valid route for the potential call connection; it will seriously degrade the network performance. A quantitative analysis of the location update failure effect on the call blocking probability in the wireless network is performed. For the sake of general applicability, the call blocking probability is formulated with the call inter-arrival time is exponentially distribution and the location area residence time is generally distribution. It is shown that the next call blocking probability is related to location update failure probability, call to mobility ratio and the previous call status. Numerical examples are presented to show the interaction between the call blocking probability and location update failure probability. Discussions on the sensitivity of tele-parameters are also given.