DCA wireless networks under high offered loads: the need for bandwidth reservation

ABSTRACT

Dynamic channel allocation policy (DCA) in wireless networks is known to be better than the fixed channel allocation (FCA) policy from the aspect of the call level QoS such as handoff dropping probability. Because of this superiority the DCA networks are usually designed without the call admission control (CAC). However, given the decrease of cell sizes, together with increasing mobile phone and terminal population, and with the bandwidth requirements of multimedia applications, it is likely to come to the situation when high traffic area size exceeds the area where channel borrowing can ensure bounded QoS. This paper analyses the performance of the DCA networks without the CAC under high intensity traffic and shows that under such conditions DCA network fails to ensure sufficiently low level of QoS. Further, we propose CAC which can stabilize the QoS under high loads and changing traffic conditions. This CAC integrates well with distributed DCA policies.

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INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Wireless communication

Additional Classification:
  C. Computer Systems Organization
  C.1 PROCESSOR ARCHITECTURES
      C.1.3 Other Architecture Styles
          Subjects: Cellular architecture (e.g., mobile)

General Terms:
Design, Performance