基于缓存与指针推进的混合移动性管理策略

提出了一种将缓存策略与指针推进策略结合的混合位置管理策略(记为HCF策略),通过利用移动用户移动的移动性以及接受呼入的局部性,在缓存信息失效的情况下,可通过遍历起始于缓存中的推进指针链来获得移动用户的位置信息,从而避免直接访问归属位置寄存器HLR(Home Location Register)数据库。因此,该策略可有效的减少对HLR的访问,减少位置管理中的通信流量。实验结果显示,当一个移动用户的呼叫-移动率较高CMR(Call-to-Mobility Ratio)或HLR的通信流量较大时,提出的策略优于基本策略和现有的缓存策略。

Hybrid mobility management strategy based on caching and forwarding strategy

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.