Systems and methods for making channel assignments to reduce...

H - Electricity – 04 – W

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H04W 72/08 (2009.01) H04W 52/04 (2009.01) H04W 24/10 (2009.01)

Patent

CA 2609120

There is disclosed a system and method for improving wireless system capacity by reducing collisions where the Signal to Interference Ratio (SIR) is high in systems having a channel reuse of 1. By ordering the channel assignment in each of the interfering cells according to a pattern, for example, according to the distance from a base station (determined by power levels), the mobile stations will become paired on the same channel in a manner to reduce interference between them. In one embodiment, this intelligent assignment is accomplished by assigning mobile stations in one cell such that the mobile station having the strongest signal is assigned channel A while in the interfering cell the mobile station with the weakest signal is assigned to channel A. In another embodiment, certain preferred mobile stations are assigned either interference- free channels or channels paired with weak interference mobile stations.

L~invention concerne un système et un procédé destinés à améliorer la capacité d~un système sans fil en réduisant les collisions lorsque le rapport signal/interférence est élevé dans des systèmes ayant une réutilisation de canal égale à 1. En ordonnant l~assignation de canaux dans chacune des cellules d~interférence selon un motif donné, par exemple, selon la distance à partir d~un poste de base (déterminée par des niveaux de puissance), les postes mobiles seront appariés sur le même canal de manière à réduire l~interférence entre eux. Dans un mode de réalisation, cette assignation intelligente consiste à affecter des postes mobiles dans une cellule pour que le poste mobile ayant le signal le plus fort se voit attribuer le canal A tandis que dans la cellule d~interférence, le poste mobile avec le signal le plus faible se voit attribuer le canal A. Dans un autre mode de réalisation, certains postes mobiles préférés se voient attribuer des canaux sans interférence ou des canaux appariés avec des postes mobiles de faible interférence.

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