Iana Siomina
ABSTRACT
Power allocated to common pilot channel (CPICH) is an important parameter in performance tuning of UMTS networks. CPICH is used to announce network presence, and hence CPICH power has great influence on the cell coverage pattern. We study automated planning of CPICH power allocation in UMTS networks implementing high speed downlink packet access (HSDPA). A commonly used strategy is to allocate uniformly a constant proportion of the total power available to CPICH. This strategy is not optimized for HSDPA service. Adopting non-uniform CPICH power and minimizing the amount required for coverage lead to spare power that can be re-allocated to HSDPA to improve user throughput. We present a novel approach for optimizing non-uniform CPICH power with emphasis on HSDPA performance at cell edge, where user throughput is typically very low. Our approach is based on a linear-integer mathematical model that ensures CPICH coverage, and optimally utilizes the power saving of CPICH to enhance HS-DPA performance at cell edges. A case study shows that the proposed approach significantly outperforms the uniform CPICH assignment.
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Index Terms
- Automated planning of CPICH power allocation for enhancing HSDPA performance at cell edges
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