Title :
A joint design of admission control and transmission rate adaptation for VoIP over wireless network
Author :
Choi, Youngkyu ; Choi, Sunghyun
Author_Institution :
Sch. of Electr. Eng., Seoul Nat. Univ., Seoul
Abstract :
The ideal design for VoIP should be able to maximize the number of concurrent users while each admitted user enjoys the satisfactory quality of voice communication. In a recent packet-based wireless system, the quality-of-service (QoS) provisioning for VoIP raises several challenging issues including correlated delay performance among users and the rate-reliability tradeoff in managing multiple transmission rates on top of the inherent difficulty originating from the dependency of QoS on end-to-end delay. For these reasons, it is rarely found in the literature the work which presents the admission criteria for VoIP in an explicit manner. In this paper, our major contributions include 1) deriving the link-level QoS requirement from the E-model; 2) presenting the admission criteria in an explicit manner; 3) proposing a transmission rate adaptation algorithm specialized for VoIP application; and 4) illustrating the feasibility of our proposed schemes by getting the necessary information from the measurement. In addition to the theoretical justification, through the intensive simulation study in the Rayleigh fading environment, we prove that our joint designs composed of the rate adaptation, measurement-based admission control algorithm, and its extension to supporting the cell-boundary users indeed work well. Also, we evaluate the impact of various parameters including the average SNR, the Doppler rate, and the wireline delay.
Keywords :
Doppler shift; Internet telephony; Rayleigh channels; quality of service; radio networks; telecommunication congestion control; telecommunication network reliability; voice communication; Doppler rate; QoS; Rayleigh fading environment; VoIP over wireless network; admission control joint design; end-to-end delay; measurement-based admission control algorithm; multiple transmission rates; packet-based wireless system; quality-of-service; rate-reliability tradeoff; transmission rate adaptation; voice communication; wireline delay; Admission control; Algorithm design and analysis; Delay; Modulation coding; Quality management; Quality of service; Rayleigh channels; Time-varying channels; Wireless mesh networks; Wireless networks;
Conference_Titel :
World of Wireless, Mobile and Multimedia Networks, 2008. WoWMoM 2008. 2008 International Symposium on a
Conference_Location :
Newport Beach, CA
Print_ISBN :
978-1-4244-2099-5
Electronic_ISBN :
978-1-4244-2100-8
DOI :
10.1109/WOWMOM.2008.4594834