移动网络中一种分布式GLR设计方案

UMTS核心网在访问网络处引入可选网元GLR来减少用户远离HLR漫游时的位置管理信令开销。传统GLR方案中，GLR一般在访问网络处集中设置，随着访问网络处漫游用户数的增多，GLR有可能成为系统瓶颈，且GLR的故障对系统是致命的。针对集中式GLR存在的问题，该文提出一种分布式GLR设置方案，使用户在访问网络处的首个访问VLR成为其GLR，从而提高系统对GLR故障的抗毁性，有效降低GLR潜在的瓶颈问题。分析结果表明，该文提出的分布式GLR方案在抗毁性，缓解瓶颈问题，降低入呼数据库查询开销及延迟等指标方面都优于传统GLR方案，同时，所提出的分布式GLR方案易于实现，只需相关网元软件升级即可。

A Distributed GLR Scheme for Mobile Networks

In the Universal Mobile Telecommunication System (UMTS) core network, an optional element Gateway Location Register (GLR) is introduced in visited networks to reduce location management signaling cost. In traditional GLR scheme, the GLR is usually centralized which may be a potential bottleneck due to the increase of number of roaming subscribers. In addition, the failure of GLR in the centralized GLR scheme will be fatal to the services for roaming subscribers. In this paper, a novel distributed GLR scheme is presented where the first visited VLR in visited network becomes the GLR for a roaming user to increase the ability to resist against failure of GLR and reduce the potential bottleneck. Analytic results show that the distributed scheme surpasses the traditional centralized GLR scheme in performance parameters such as robustness, resistance-bottleneck, database tracking cost and tracking-delay. In addition, the proposed scheme is easily realized since it only involves in software upgrade in corresponding network elements.