Call Admission Schemes for Multimedia Services in CDMA Cellular Systems

셀룰라 시스템에서 멀티미디어 서비스를 위한 호 수락제어 기법 연구

  • Published : 2006.03.01

Abstract

We propose a novel call admission control scheme which improves the handoff drop and the new call block probabilities of high priority services, minimizing the negative impact on low priority services, in multimedia service cellular networks. This paper proposes three schemes to solve this problem; the packing scheme in which available channels of a cell distributed to each frequency channel are concentrated on one frequency channel and a high transmission rate service is assigned to the frequency channel; the queuing scheme in which the queue is used for high transmission rate calls; and the power reallocation scheme in which the power assigned to calls under service is temporarily reduced and a high transmission rate service is allowed. The simulation results revealed that our scheme improved the drop and the block probabilities of the high priority services compared with the conventional scheme.

본 논문에서는 셀룰러 시스템에서 다양한 특성을 갖는 밀티미디어 서비스에 우선순위를 각각 부여하여 효율적으로 제어하여 핸드오버 서비스나 신규 서비스에 대한 블록킹 확률을 최소화하는 호 수락제어 기법을 제안하였다. 본 알고리즘은 비실시간 서비스들이 대역폭을 공유하는 Packing 방식, Queuing 방식, Power reallocation 방식의 호 수락 제어 방법에 관한 것으로 비실시간 서비스들의 트래픽 특성에 따라 공유 대역폭을 할당하고 남은 잉여 자원을 우선순위가 높은 실시간 서비스에게 제공하여 QoS를 보장하였다. 본 논문에서 성능판단 파라메타로는 블록킹 확률과 강제절단 확률을 설정하였고 다양한 형태의 멀티미디어 트래픽에 대해서 블록킹 확률과 강제절단 확률을 시뮬레이션을 통하여 각각 비교 분석하였다.

Keywords

References

  1. J.C.S. Cheung, M.A. Beach, and J.P. McGeehan, 'Network Planning for Third Generation Mobile Radio Systems', IEEE Commun. Mag., vol.32 no. 11, pp. 54-59, Nov., 1994
  2. Fottini-Niovi Pavlidou, ' Mixed Media Cellular Systems', IEEE Trans. on Commun., vol. 42, no. 2/3/4, pp. 818-853, February/ March/ Aprial 1994
  3. Jianming Wu and Ryuji Kohno, 'A Wireless Multimedia CDMA System Based on Transmission Power Control', IEEE Journal on Selected Area in Commun., vol. 14, no. 4, May 1996
  4. Sampath, P.S. Kumar and J.M. Holtzman, 'Power Control and Resource Management for a Multimedia CDMA Wireless System', IEEE PIMRC pp. 21-25 1995
  5. Audrey M. Viterbi and Andrew J. Viterbi, 'Erlang Capacity of a Power Controlled CDMA System', IEEE Journal on Selected Area in Commun., vol. 11, no. 6, August 1993
  6. TIA/EIA/IS-95, Mobile Station-Base Station Compatibility Standard for Dual Mode Wideband Spread Spectrum Digital Cellular System, July 1993
  7. Andrew J. Viterbi, CDMA Principles of Spread Spectrum Communication, Addison Wesley Publishing Company, 1995
  8. Moo-Ho CHO, Kwang-Sik KIM and KyungRok CHO, 'The Handoff Rate of Two Way Soft Handoff Scheme in DS-CDMA Cellular Systems' , IEICE TRANS. on COMMUN., vol. E-80-B, no.8 August 1997
  9. Hong, D. and Rappaport, S.S., 'Traffic Model and Performance Analysis or Cellular Mobile Radio Telephone System with Prioritized and Nonprioritized Handoff Procedures', IEEE Trans. on Veh. Technol., vol.35, pp. 77-91, 1986 https://doi.org/10.1109/T-VT.1986.24076
  10. Ye, J., Hou, J., Papavassiliou, S.: A Comprehensive Resource Management Framework for Next Generation Wireless Networks : IEEE Transactions on Mobile Computing, vol. 1, no. 4,2002
  11. Navidi, W., Camp, T.: Stationary Distributions for the Random Waypoint Mobility Model: IEEE Transactions on Mobile Computing, vol. 3, no. 1,2004
  12. Chang, R. and Leu, S. :Handoff Ordering Using Signal Strength for Multimedia Communications in Wireless Networks: IEEE Transactions on Wireless Communications, vol.3, no.5, September 2004