Efficient Bitmap Signaling for VoIP in OFDMA

The communication system is currently undergoing a convergence to IP services. As a result, voice over internet protocol (VoIP) will be commonplace in the near future. In order to maximize the voice capacity, the overhead associated with controlling VoIP transmissions must be carefully managed. The current efforts in B3G (beyond 3G) standards development to efficiently control VoIP transmissions by grouping VoIP users into scheduling groups, assigning the group a set of shared time-frequency resources, and using bitmap signaling to allocate resources were detailed in [1]. This paper introduces several improvement mechanisms which enhance the basic concept outlined in [1]. System level simulations are used to validate the improved signaling technique and show that the technique can efficiently support 133 VoIP users per megahertz in a VoIP only system and 64 VoIP users per megahertz plus 1.05 Mbps for the traffic mixed considered in a mixed VoIP/data system.