Integrated Layer Selection And Dynamic Resource Assignment In Hierarchical Cellular System

Hierarchical cellular systems are proposed to accommodate mobile users of different speeds. Becausehigh speed users are severed by marcocells, and low speed users are severed by microcells, the handoff canbe reduced. Cell Selection technology is one of Resource Management in Hierarchical cellular systems.This thesis sets up a two-cells cellular system, and analyses the influence of velocity threshold. The thesisproves that with different velocity threshold in two cells and one cell's velocity is fixed, switch frequency isdirect ratio of the other cell's velocity threshold, while block ratio and force ratio is inverse ratio of thethreshold. The thesis first brings forward the idea of Integrate Layer Selection, which combines manyfactors to do cell selection. The factors concludes channel occupation, bandwidth request and user velocityand so on. The thesis puts forward two arithmetic, one combines velocity with channel occupation and theother combines velocity with bandwidth request. The first arithmetic makes two cells take charge of thetraffic and gives a sufficient using of channels. The second arithmetic is used in a multi-operation system,different operations request different bandwidth, broad bandwidth operations are connected to microcellsand narrow bandwidth operations are connected to macrocells, as microcell has more plentiful channelsthan macrocell dose. The thesis compares the Integrate Layer Selection Arithmetic (ILS) with ResidualDwell Time Approach and Fuzzy Layer Selection Approach(FLS), ILS arithmetic gives a lower block rateand force rate, and makes a higher capacity of system.