关键词: Hilbert空间, 向量范数, 容忍空间, 网络选择, 垂直切换控制

Abstract:

A network selection scheme based on Hilbertspace vector norms is presented. It defines the vector norms as satisfaction function to revise the weighting factors of metrics given by analytic hierarchy process (AHP). Meanwhile, the scheme exploits vector geometrical relationships in Hilbert subspace basing on revised weights to measure similarities between vectors of network ability and user target. It can be used to choose the most suitable network for users, thereafter, it constructs a flexible space based on the both thresholds of angle and distance between network ability and user target vectors to control the handover frequency. Simulations fully indicate that the proposed scheme can select the appropriate network for various services accurately and reduce the frequency of vertical handover to maintain service constancy.

Key words: Hilbert Space, Vector Norms, Flexible Space, Network Selection, Vertical Handover control