Title :
Providing VoIP Service over TD-SCDMA HSDPA
Author :
Chen, Shuping ; Wang, Wenbo ; Han, Jing ; Liu, Guangyi ; Li, Nan
Author_Institution :
Jing Han Sch. of Telecommun. Eng., Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
Providing voice over IP (VoIP) service in wireless networks is especially challenge for the tight delay requirement and the small voice packet. This paper addresses the unique issues when providing VoIP in TD-SCDMA HSDPA (time duplex division-synchronous code division multiple access high speed downlink packet access) systems. The impact of smart antenna was analyzed, which results in relative small gain of AMC (adaptive modulation and coding). An optimized scheduling and multiplexing scheme combining both time- and code-multiplexing was proposed. The VoIP performance is investigated via simulation. Results are obtained for different scheduling and multiplexing strategies, different AMC and hybrid ARQ (hybrid automatic retransmission request) settings. It was shown that the capacity of VoIP is significant higher than that of dedicated channel bearing voice.
Keywords :
Internet telephony; adaptive antenna arrays; adaptive codes; adaptive modulation; code division multiple access; radio access networks; VoIP service; adaptive coding; adaptive modulation; high speed downlink packet access; hybrid automatic retransmission request; optimized scheduling; smart antenna; tight delay requirement; time duplex division-synchronous code division multiple access; wireless networks; Automatic repeat request; Delay; Internet telephony; Multiaccess communication; Resource management; Scheduling algorithm; System performance; Testing; Time division multiple access; Time division synchronous code division multiple access;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.464
