Optimal Timer Settings For The Soft Handover Algorithm in WCDMA
One important measure for the signaling load in WCDMA is the number of handovers per time unit. In particular the branch additions and releases for the soft handover are crucial for the amount of signaling load in the network. We investigated the soft handover algorithm known from the current 3GPP standardization lzl with its timers to trade off the signaling rate against network performance which is defined over the satisfied user criteria as defined in the ETSI SMG 2 UMTS 30.03. The inter-handover time of soft handover, softer handover is respectively discussed in this paper. The system level simulation results and recommended settings are given for the soft handover parameters. We have shown that the timers can increase the mean handover time with a tolerable degradation of system performance. We assumed speech service for our investigations
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