A Framework for supporting VoIP Services over the Downlink of an OFDMA Network

The fourth generation of wireless networks (4G) are presently being discussed in standards bodies (3GPP2, 3GPP, 802.16, 802.20) and one common conclusion is that the most appropriate technology for the forward link is orthogonal frequency division multiple access (OFDMA). In addition, it is believed that all services (i.e., both real-time services like voice and also data) can be supported over such a channel using an all-IP network. However, even for 3G networks, the efficient support of services such as voice over IP (VoIP) over wireless packet switched channels is still to be verified in the field. In this paper, we look at the issues involved in transporting VoIP over the forward link of an OFDMA network and propose a framework that can address many of these issues. We support our proposals with numerical results

[1]  P. Hosein.  Optimal Allocation of Bandwidth and Power Resources to OFDMA VoIP Channels , 2007, 2007 2nd International Symposium on Wireless Pervasive Computing.

[2]  Guocong Song,et al.  Joint channel-aware and queue-aware data scheduling in multiple shared wireless channels , 2004, 2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733).

[3]  Joachim Speidel,et al.  An efficient waterfilling algorithm for multiple access OFDM , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.

[4]  Kwang Bok Lee,et al.  Transmit power adaptation for multiuser OFDM systems , 2003, IEEE J. Sel. Areas Commun..

[5]  Patrick A. Hosein.  Capacity of packetized voice services over time-shared wireless packet data channels , 2005, Proceedings IEEE 24th Annual Joint Conference of the IEEE Computer and Communications Societies..

[6]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[7]  Jeffrey G. Andrews,et al.  Broadband wireless access with WiMax/802.16: current performance benchmarks and future potential , 2005, IEEE Communications Magazine.

[8]  Ieee Microwave Theory,et al.  IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions , 2007 .