DocumentCode :
2735188
Title :
Performance issues in two-tier cellular networks
Author :
Pandey, Vijoy ; Ghosal, Dipak ; Mukherjee, Biswanath
Author_Institution :
Dept. of Comput. Sci., California Univ., Davis, CA, USA
fYear :
1999
fDate :
1999
Firstpage :
374
Lastpage :
378
Abstract :
A two-tier cellular network consists of a number of small microcells overlayed by larger macro (umbrella) cells. Such a network can support improved quality of service (QoS), higher capacity, and larger coverage area than existing networks. In this work, we study the channel allocation problem for a two-tier cellular network for two types of calls (voice and data), under different degrees of handoff overheads. We also compare the impact of two typical call admission algorithms on network performance. We observe that, when minimal handoff overheads are present, allocating more channels to the microcell layer results in lower blocking and dropout probabilities. Second, there is an optimal orthogonal assignment of channels between the two tiers that minimizes the blocking and the dropout probabilities, when handoff overheads are significant, suggesting a hierarchical approach for designing handoff controllers. Finally, on comparing two typical call admission algorithms, we show that an algorithm that treats all calls identically performs better than an algorithm which tries to assign calls to different tiers based on their holding times
Keywords :
cellular radio; channel allocation; microcellular radio; personal communication networks; probability; quality of service; telecommunication congestion control; QoS; blocking probabilities; call admission algorithms; channel allocation problem; dropout probabilities; handoff controllers; handoff overheads; larger macro cells; microcells; network performance; optimal orthogonal assignment; performance issues; personal communication networks; quality of service; two-tier cellular networks; umbrella cells; Analytical models; Channel allocation; Computer science; Intelligent networks; Land mobile radio cellular systems; Microcell networks; Optimal control; Personal communication networks; Quality of service; Telecommunication traffic;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal Wireless Communication, 1999 IEEE International Conference on
Conference_Location :
Jaipur
Print_ISBN :
0-7803-4912-1
Type :
conf
DOI :
10.1109/ICPWC.1999.759652
Filename :
759652
Link To Document :
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