A control-period-based distributed adaptive guard channel reservation scheme for cellular networks

摘要

In this paper a new control-period-based distributed adaptive guard channel reservation (CDAGCR) technique is proposed to meet the call admission level quality-of-service (QoS) in wireless cellular networks. It partitions the real time into control periods. Handoffs during the current control period is used to reserve guard channels at the beginning of the next control period. Efficient mechanisms are devised to adaptively vary the length of the control period which further regulates the number of guard channels used to meet the call admission level QoS. The BSC associated with the cell site can do this exclusively without generating any signal overhead for information exchange among cell sites unlike the schemes described in [1–4]. Thus, the CDAGCR scheme is amenable to a fully distributed implementation. Extensive simulation studies have been carried out with an emulated test bed to investigate the performance of this CDAGCR scheme. It is found that this CDAGCR scheme keeps the handoff call drop probability below the targeted QoS with comparable new call blocking by adaptively varying the length of the control period. The simulation results appear promising.