CATV-Based Personal Communications Network: The Architectures and Handoff Schemes

摘要

The cable TV (CATV) network is an ideal back- bone for PCS due to its prevalent and broadcast nature. This significantly reduces the implementation costs and the handoff overheads. This paper proposes two architectures for the CATV- based PCS system. In the first architecture, each base station is equipped with multiple fixed receivers to provide fast and seam- less handoffe for mobile users. Nevertheless, the hardware cost for this implementation is relative expensive. To overcome this, in the second architecture, each base station is equipped with only one tunable receiver. This simple and economic architec- ture suffers from the possibility of offset conflict when mobile terminals handoff between cells. Three offset assignment algo- rithms based on the concepts of random assignment, neighbor usage, and clustering, respectively are proposed to solve the off set conflict problem. Simulation results indicate the one with the concept of clustering performs much better than the other two schemes in terms of offset conflict probability.