关键词: 移动位置管理, 缓存, 指针推进, 查找

Abstract: In the existing cache scheme, the use of cache information can effectively reduce the total location management cost for locating frequently called mobile users. However, when the cache information is invalid, it results in much more cost than that of the IS-41.In order to solve this problem, a kind of hybrid of cache and forwarding pointers mobility management scheme (called HCF scheme) is proposed in this paper, which exploits a user’s movement and call locality. Even if the cache information is not up-to-date, the called mobile user can be found by tracing forwarding pointers starting from that VLR pointed in the cache instead of querying the HLR. Therefore, this scheme can effectively reduce the access to the HLR and the signaling traffic in the location management. Analytic results show that, the proposed scheme outperforms other schemes when a user’s CMR is high or the signaling traffic to the HLR is heavy.

Key words: location management, cache, forwarding pointer, query