The Impact of Unbalanced Availability on the Grade of Service of Wireless Systems

  • Authors:

  • Avraham Freedman;Amit Gil;Ran Giladi

  • Affiliations:

  • Department of Electrical Engineering-Systems, Tel-Aviv University, P.O. Box 39040, Ramat-Aviv, Tel Aviv, 69978, Israel;Celltick Technologies Ltd., 7 Hagalim Ave., P.O. Box 12878, Herzliya, 46733, Israel;Department of Communication Systems Engineering, Ben Gurion University of the Negev, Beer-Sheva, 84105, Israel

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2002

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Abstract

Cellular wireless systems, such as mobile systems and fixed wireless access systems may encounter the problem of limited availability, where users of the system do not enjoy equal access opportunity to the systems' radio ports. The problem of limited availability was encountered in the early age of telephony but it has not yet been analyzed in the context of its impact on wireless system capacity. Two common scenarios where limited availability is encountered are discussed in this paper. One where there is an overlap in the coverage of two neighboring stations and the other where the coverage of one radio port is completely contained within that of the other. The paper analyzes two possible policies of radio port selection for the users who can access more than one port. One access policy is that of a completely random choice, while by the other the user selects only one of the free ports. The analysis demonstrates that system capacity may drop substantially if a proper balance is not maintained.