在移动通信系统中,移动性管理即位置管理是一个具有挑战性的研究内容。移动台越区漫游规律的研究,对评价各种位置管理策略的代价及性能有着重要意义。通过构造向量马氏过程,利用密度演化方法,我们导出了移动台越区次数的一个概率公式,并用此公式对现行的位置管理策略及指针推进策略的代价进行了研究。 In mobile communication systems, mobility management, or location management, is a challenging research topic. The research on the mobile roaming rule of cross-area roaming is of great significance for evaluating the cost and performance of various location management strategies. By constructing the vector Markov process and using the density evolution method, we derive a probabilistic formula for the number of handoffs of the mobile station and use this formula to study the cost of the current location management strategy and pointer push strategy.