Optimisation of soft handoff margin in WCDMA cellular system
by S. Tamilselvan, K. Manivannan
International Journal of Communication Networks and Distributed Systems (IJCNDS), Vol. 4, No. 3, 2010

Abstract: The focus of the paper is to analyse the downlink performance of a wideband code division multiple access (WCDMA) system with site selection diversity transmission (SSDT) power control during soft handoff (SHO) mode and to find the optimum SHO margin (M_SH) in terms of maximum system capacity under energy-per-bit to noise spectral density ratio (E_b/N₀) quality requirements. Analysing the dependency of the connection probabilities, percentage of users connected to one, two, or three base stations (BSs) simultaneously as a function of the M_SH. We analysed the system capacity and required resources dependency on M_SH for voice service and combined multimedia mobile services. System capacity dependency on M_SH is analysed, by considering two types of user distributions, namely: 1) uniform user distribution; 2) a concentration of all the users in the location that requires maximum transmitted power (the worst case). The result of this analysis shows an increase in user capacity of about 16%-20% for the optimum M_SH of 5-5.5 dB. Nevertheless, the resources required (number of scrambling codes) by the base station increases faster than the number of active users in terms of M_SH.

Online publication date: Fri, 02-Apr-2010

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