Burst Construction and Packet Mapping Scheme for OFDMA Downlinks in IEEE 802.16 Systems

In this paper, we propose a burst construction and packet mapping scheme in the orthogonal frequency-division multiple access (OFDMA) downlinks of IEEE 802.16 systems. In the standard of the systems, there are some restrictions on the usage of downlink radio resources and they are defined in the physical layer (PHY) specification. One of the main restrictions is that a rectangular region, which is called Burst, is defined on a two-dimensional domain of time and frequency, and packets must be allocated within the region. However, how to define the burst and allocate data packets within the burst is left implementation dependent. Therefore, we consider a burst construction and packet mapping scheme that is easy to realize on systems and attains efficient usage of radio resources. By computer simulation, it has been confirmed that the proposed scheme can decrease not only the control data ratio within the rectangles, but also control data that must be transmitted at the head of every frame, which can result in higher throughput.