On the impact of soft handoff in cellular systems

Authors:
Nidhi Hegde;Khosrow Sohraby
Affiliations:
Wireless Technology Research Department, Bell Laboratories, Lucent Technologies, 791 Holmdel-Keyport Road, Holmdel, NJ;School of Interdisciplinary Computing and Engineering, University of Missouri--Kansas City, 5100 Rockhill Road, Kansas City, Mo
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2002

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Abstract

We present a model for soft handoff in wireless cellular networks. In such networks, due to overlapping cells, handoffs are not instantaneous and multiple channels may be occupied by a single mobile for a non-zero freeze time period.We provide a mathematical model of wireless cellular networks with soft handoffs. We examine different performance measures and show that freeze time may have a major impact on the system performance if the mobility rate is not negligible. Both exact and approximate formulations are given. Different fixed-point approximation methods are used to reduce the complexity of the exact solution. Various performance measures such as new and handoff blocking and probability of a call dropout are carefully examined.