Performance of a distributed coverage SFH-TDMA system with mobility management in a high density traffic network
A. Wautier, Jacques Antoine, Jérôme Brouet, Vinod Kumar · 2002
Low probability of blocking (Pb) at call set-up and very low probability of forced call termination (Pf), are important design criteria for micro and pico-cell networks deployed for very high traffic density areas like dense urban and indoors. In conventional cellular networks with fixed channel allocation (FCA), fine tuning of radio resource management (RRM) algorithms like channel selection (CS), channel change (CC) and handover (HO) is thus a difficult task. The difficulty is further increased because a higher number of handovers per call has to be handled. A new network architecture based on the concept of distributed radio coverage has been found to manage mobility and interference in high density traffic areas for TDMA systems like GSM/DCS, IS-54/IS-136. This paper focuses on RRM algorithms for such an approach whereby the coverage of a single cell is realised with synchronised relays using the same broadcast channel. The conventional HO is replaced by progressive channel activation on predicted best server relays. Five different strategies for channel selection/activation, ranging from channel activation on one best server antenna to simultaneous channel activation on all the antennas of a cell, have been evaluated. A mix of information of subscriber mobility and the existing traffic load on the cell is shown to have a determining influence on the channel selection/activation strategies offering maximum traffic throughput and minimum Pf.