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Multiple base site coverage with overlapping and overlaying wireless architectures

University of British Columbia

The demand for cellular radio and personal communications services (PCS) continues to increase. Expectations for third generation wireless systems include higher data rates, improved quality of service, and ubiquitous coverage and access. Microcells with low base site transceiver antenna heights and small coverage areas are proposed to increase capacity. Microcellular architectures increase the frequency of handoffs and areas of low radio signal levels (radio "holes"). Accordingly, we propose multiple base site coverage with either extended overlapping microcells or macrocells overlaying microcells to reduce handoff rates and to enhance coverage and capacity. Analytical models accounting for call overflow to alternate base sites, increased co-channel interference, and radio holes are developed to evaluate system performance. The considered scenarios include an isolated group of microcells, a contiguous layer of microcells, and macrocell overlay with and without macrocell frequency reuse. Performance measures for assessment of the architectures include blocking probability, maximum supportable arrival rate, dropped call probability, handoff activity and carried traffic. In the absence of radio holes and co-channel interference, overlapping and overlaying architectures reduce call blocking and increase carried traffic. With co-channel interference and adequate signal levels everywhere, these performance advantages are much diminished. Performance benefits of overlapping and overlay architectures are substantial, even with co-channel interference when radio holes are present. Handoff activity which is also evaluated is not much affected by architectural variations.

Thesis/Dissertation

application/pdf

2009-04-27

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http://hdl.handle.net/2429/7620

Electrical and Computer Engineering

University of British Columbia

UBCV

DSpace