A performance model for admission control in IEEE 802.16

Eunhyun Kwon, Jaiyong Lee, Kyunghun Jung, Shihoon Ryu

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)


For systems based on connection-oriented services, such as IEEE 802.16, call admission control (CAC) strategy is essential to provide a desired level of quality of service (QoS). Although many handoff-prioritized CAC schemes, which assume a fixed channel capacity, have been introduced, this assumption is not always valid for IEEE 802.16 that uses adaptive modulation and coding (AMC). With AMC, the modulation type of a user's connection can be changed dynamically and the ongoing connection might fail due to the change of modulation. In this paper, we approach the AMC-induced CAC problem by focusing on the guaranteed connection. Three kinds of calls, new, handoff, and modulation-changed calls, are considered. We propose a modified guard channel CAC scheme that allows the modulation-changed and handoff calls to use the guard channel. Then we analyze a Markov model for the CAC scheme with long-term AMC in mind. According to the simulation results, the proposed approach reduces the call dropping probability for modulation-changed calls, which suggests the threshold of guard channels in IEEE 802.16 can be determined based on the proposed approach.

Original languageEnglish
Pages (from-to)159-168
Number of pages10
JournalLecture Notes in Computer Science
Publication statusPublished - 2005
EventThird International Conference on Wired/Wireless Internet Communications, WWIC 2005 - Xanthi, Greece
Duration: 2005 May 112005 May 13

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • General Computer Science


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