Load reduction of a visitor location register

Details Load reduction of a visitor location register Load reduction of a visitor location register

H - Electricity

04

Q

H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2241753

A problem arises when the data of the visitor location register (VLR) are lost for some reason. In this case, only the visitor location register (VLRn) in whose area the mobile station (MS) is located is known. The mobile station (MS) must then be paged in all location areas (LAn) of the visitor location register (VLR). Such paging of mobile stations causes a significant overload. The overload is reduced, according to the invention, by dividing the area covered by a physical visitor location area (VLR) into areas of a plurality of logical visitor location registers (LVLRn). In connection with location updatings, not only the physical visitor location register (VLR) is stored but also information on the logical visitor location register (LVLRn) in whose area the mobile station (MS) is located; in a problematic situation where the switching centre (MSC) is not aware of the location area of the mobile station (MS), the mobile station (MS) is paged, at least at first, only in the area of the logical visitor location register (LVLRn).

La perte des données du registre de localisation de visiteur (VLR) pose un problème. Dans ce cas, seul est connu le registre de localisation de visiteur (VLRn) dans la zone duquel la station mobile (MS) est située. La station mobile (MS) doit alors être recherchée dans toutes les zones de localisation (LAn) du registre (VLR). La recherche de ces stations mobiles provoque une surcharge importante. L'invention permet de diminuer la surcharge en divisant la zone couverte par une zone physique de localisation de visiteur (VLR) en zones comportant une pluralité de registres logiques de localisation de visiteur (LVLRn). En relation avec les mises à jour de localisations, non seulement le registre physique de localisation de visiteur (VLR) est mémorisé mais, également, l'information contenue par le registre logique (LVLRn) dans la zone duquel la station mobile (MS) est située. Dans le cas problématique dans lequel le centre de commutation (MSC) ne connaît pas la zone de localisation de la station mobile (MS), cette dernière est recherchée, au moins en premier lieu, uniquement dans la zone du registre logique de localisation de visiteur (LVLRn).

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