Acta Metallurgica Sinica(English letters) ›› 2008, Vol. 15 ›› Issue (1): 80-84.doi: 1005-8885 (2008) 01-0080-05

• Wireless • Previous Articles     Next Articles

Call admission control scheme for real-time services in packet-switched OFDM wireless networks

  

  1. School of Information Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2007-06-01 Revised:1900-01-01 Online:2008-03-31
  • Contact: Hu Nan

Abstract:

A call admission control scheme is proposed for real-time services in packet-switched orthogonal frequency division multiplexing (OFDM) wireless cellular networks. The main idea of the proposed scheme is to use maximum acceptance ratio to maintain maximum channel utilization for real-time services according to the desired packet-level and call- level quality-of-service (QoS) requirements. The acceptance ratio is periodically adjusted by using a time discrete Markov chain and Wiener prediction theory according to the varying traffic load. Extensive simulation results show that this algorithm maintains high channel utilization, even as it guarantees packet-level and call-level QoS requirements for real-time services.

Key words:

call admission control;OFDM;packet transmission delay

CLC Number: