DocumentCode :
1970278
Title :
Call admission control: QoS issue for VoIP
Author :
Hoque, Mohammad Asadul ; Afroz, Farhana
Author_Institution :
IT Div., TM Int. Bangladesh Ltd. (AKTEL), Dhaka
fYear :
2008
fDate :
6-10 Jan. 2008
Firstpage :
757
Lastpage :
761
Abstract :
One of the vital key elements for providing quality of service (QoS) for VoIP is the call admission control (CAC) capabilities of the session management/call session control function or gateway. Even though the network may be designed to meet a given performance and restoration objective for the engineered traffic loads, the actual traffic may be significantly higher. Without a CAC function in a VoIP network during overloads, links become congested and new calls keep getting admitted. All calls in progress, not just the new calls start dropping packets and experiencing longer delays. Contrast this to a circuit switched network, where new calls get blocked, but calls in progress experience good call quality. In the VoIP case, packet loss could become large enough that calls become unintelligible, callers hang-up their call, and most will reattempt. This paper gives an overview of potential CAC approaches, highlighting four basic alternatives; based on endpoint performance measurements, path-based bandwidth management, link-based bandwidth management, and per-call bandwidth reservation. The paper also recommends a link bandwidth management approach for its scalability and efficacy.
Keywords :
Internet telephony; bandwidth allocation; quality of service; telecommunication congestion control; telecommunication network management; telecommunication traffic; QoS; VoIP network; call admission control; endpoint performance measurement; gateway; link-based bandwidth management; path-based bandwidth management; per-call bandwidth reservation; quality of service; session management; Bandwidth; Call admission control; Communication system traffic control; Delay; Design engineering; Measurement; Quality management; Quality of service; Switching circuits; Telecommunication traffic; OSPF-TE; RSVP; RTCP; bandwidth; call admission control; circuit-switched;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communication Systems Software and Middleware and Workshops, 2008. COMSWARE 2008. 3rd International Conference on
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-1796-4
Electronic_ISBN :
978-1-4244-1797-1
Type :
conf
DOI :
10.1109/COMSWA.2008.4554512
Filename :
4554512
Link To Document :
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