An OFDM-based system with dynamic packet assignment and interference suppression for advanced cellular Internet service

摘要

Future wireless networks are expected to employ packet access with high peak-bandwidth demands. This will impose a significant challenge for frequency reuse, especially for services deployed in a wide area. A dynamic packet assignment (DPA) method has been proposed as a key component of the MAC protocol for an OFDM-based advanced cellular Internet service (ACIS) system, which is targeted for applications such as Web browsing, with a peak downlink transmission rate on the order of 1 Mb/s using a wide-area cellular infrastructure. This method is able to allocate radio resources on a packet time scale and reassign them in about 100 msec, thereby gaining advantages in both statistical multiplexing of packet access and spectrum efficiency of dynamic channel assignment (DCA). Interference suppression is considered in this paper as method for performance enhancement. Following a detailed discussion of the frame structure and the DPA algorithm, comprehensive performance evaluation on the downlink delay and throughput characteristics is presented. It is found that this method achieves significant performance without requiring additional overhead.