Increasing the VoIP Capacity through MAP Overhead Reduction in the IEEE 802.16 OFDMa Systems

One of the main issues with supporting VoIP service over 802.16 networks is the signalling overhead caused by the downlink MAP messages due to frequent transmissions and small packets. To decrease the MAP overhead, the 802.16 standard proposes some mechanisms, such as the compressed MAP and sub-MAPs. In this paper, we show by means of extensive dynamic simulations that sub-MAPs can reduce dramatically the signalling overhead associated with VoIP traffic and significantly improve overall VoIP capacity. At the same time, since sub-MAPs are more sensitive to packet drops, they tend to increase the number of HARQ retransmissions in downlink and transmission delays in the uplink direction.

[1]  Alexander Sayenko,et al.  WINSE: WiMAX NS-2 extension , 2009, SIMUTools 2009.

[2]  Alexander Sayenko,et al.  Measurement-Based Connection Admission Control Methods for Real-Time Services in IEEE 802.16e , 2009, 2009 Second International Conference on Communication Theory, Reliability, and Quality of Service.

[3]  Ieee Microwave Theory,et al.  Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems — Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands , 2003 .

[4]  Timo Hämäläinen,et al.  Scheduling solution for the IEEE 802.16 base station , 2008, Comput. Networks.

[5]  Adam Wolisz,et al.  Performance analysis of dynamic OFDMA systems with inband signaling , 2006, IEEE Journal on Selected Areas in Communications.

[6]  V Tykhomyrov,et al.  Decreasing the MAP overhead in the IEEE 802.16 OFDMA system , 2010, 2010 European Wireless Conference (EW).

[7]  Mo-Han Fong,et al.  Improved VoIP capacity in mobile WiMAX systems using persistent resource allocation , 2008, IEEE Communications Magazine.

[8]  Alexander Sayenko,et al.  Uplink VoIP Delays in IEEE 802.16e Using Different ertPS Resumption Mechanisms , 2009, 2009 Third International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies.

[9]  Todor Cooklev,et al.  Air Interface for Fixed Broadband Wireless Access Systems , 2004 .

[10]  Jaewoo So.  An efficient uplink mapping scheme for VoIP services in the IEEE 802.16e OFDMA system , 2008 .

[11]  Yong-Hwan Lee,et al.  Efficient Transmission of Multicast MAPs in IEEE 802.16e , 2008, IEICE Trans. Commun..