Prioritized Handoff Dynamic Channel Allocation in Hierarchical Cellular Systems

• Main Authors: Ying-Yu Chen, 陳瀅羽
• Other Authors: 蔡榮宗
• Format: Others
• Language: en_US
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/5y56yt

碩士 === 國立臺灣師範大學 === 資訊教育研究所 === 89 === We propose a channel assignment strategy, called Hierarchical cellular system - Prioritized Handoff Dynamic Channel Allocation strategy (HPHDCA), for use in hierarchical cellular networks, in which channel resources are shared by both tiers of cells. The HPHDCA is essentially a DCA scheme with additional operational features including prioritized-handoff, local-packing, reservation-sharing and overflow. In distributed operation environment, these features are achieved through looking up channel status maintained in an ACOR table. The ACOR table is developed to support enough information of channel usage patterns of interference cells sufficient for each cell to determine channel allocation by itself. By the mobility of nonuniform transition probability between cells and different dwell time distribution in microcells and macrocell-only areas, simulations show that the HPHDCA in macrocell/microcell overlay is able to yield favorable performance on handoff call blocking over new call blocking, at the cost of new call blocking probability. One additional feature is found that HPHDCA takes the conventional overflow technique completely into the reservation-sharing scheme, with no need to crank up a new overflow mechanism.