期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2014
卷号：9
期号：3
页码：133-146
DOI：10.14445/22312803/IJCTT-V9P128
出版社：Seventh Sense Research Group
摘要：In this paper, a twotier cellular communication wireless network is characterized by overlapping the service area for managing the new calls users having different mobility speed. The overlapping property of the twotier system provides the advantages that share the traffic load to improve the efficiency of new calls subscriber with reservation of channels (guard channels) in cell to handle the ongoing old calls (handoff calls). Microcells are used to provide the services to slowspeed, highintensity traffic area users and macrocells are overlaid over more than one microcells cater mainly too lower density, highspeed users. The twotier of microcells and macrocells provide the secondary resource which provide the service to new calls as well as handoff calls with guard channels by overflow the slow speed users in macrocell and sharing the frequency in vertical as well as in horizontal directions in the upper layer. In this paper, we tried to optimize use of resources by using advantage of overlapping coverage of twotier wireless cellular networks and frequency sharing techniques like VDFS and HDFS. The call lose probability of new calls are developed through numerical analysis. The VDFS and HDFS schemes are proposed and compared with the existing schemes of CAC. The result shows the new proposed schemes are more efficient.
关键词：cellular network; two-tier communication system; load redirection; guard channel; frequency sharing.
