Title :
Enhanced upstream scheduling algorithm for variable bit rate VoIP service over hybrid fiber coaxial network
Author :
Hong, Seung-Eun ; Lee, Wooyong
Author_Institution :
Wireless Telecommun. Res. Dept., ETRI, Daejeon
Abstract :
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.
Keywords :
Internet telephony; access protocols; hybrid fibre coax networks; scheduling; DOCSIS; HFC network; MAC protocol; UGS-AD; VoIP service; data-over-cable system interface specification; enhanced upstream scheduling algorithm; hybrid fiber coaxial network; silence suppression; unsolicited grant service with activity detection; variable bit rate; variable bit rate service; Bit rate; Cable TV; Coaxial components; Codecs; Communication cables; Hybrid fiber coaxial cables; Internet telephony; Media Access Protocol; Scheduling algorithm; Traffic control;
Conference_Titel :
Consumer Electronics, 2008. ISCE 2008. IEEE International Symposium on
Conference_Location :
Vilamoura
Print_ISBN :
978-1-4244-2422-1
Electronic_ISBN :
978-1-4244-2422-1
DOI :
10.1109/ISCE.2008.4559558
