Abstract:

Call admission control based on SINR is proposed to solve the admission problem of TDD-CDMA-HCS (time division duplexing-code division multiple access-hierarchical cell structure) system. Based on the definition of a system utility function, decision of admission is made according to the usage of resources. Both inter-layer call overflow and system-load based layer selection are implemented. Simulation results show that the call block ratio and the system drop-out ratio decrease significantly, resulting in considerable improvement of the system performance.

Key words: call admission control , hierarchical cell structure , overflow , layer selection , SINR