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Enhanced upstream scheduling algorithm for variable bit rate VoIP service over hybrid fiber coaxial network

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2 Author(s)
Seung-Eun Hong ; Wireless Telecommun. Res. Dept., ETRI, Daejeon ; Wooyong Lee

In this paper, we enhance the existing upstream scheduling algorithm for VoIP service in data-over-cable system interface specification (DOCSIS) MAC protocol which is, called unsolicited grant service with activity detection (UGS-AD), not able to efficiently support various VoIP codecs with variable bit rate (VBR) and silence suppression over the shared medium hybrid-fiber-coaxial (HFC) network. We modify the UGS-AD to minimize a waste of uplink resources for supporting the VBR VoIP service. This proposed scheme is compared with the existing UGS-AD through the capacity analysis. Results show that our proposed algorithm can support more up to 59% voice users compared with the existing UGS-AD.

Published in:

Consumer Electronics, 2008. ISCE 2008. IEEE International Symposium on

Date of Conference:

14-16 April 2008