Analysis of parallel polling to maintain high-speed packet transfer for fast-moving terminals in microcellular network

The paper presents packet transfer control procedures in an MM-MAN (mobile multimedia metropolitan area network) which is considered to be a component network of beyond-3G, and is deployed along main roads in metropolitan business areas. The MM-MAN supports IP-based, high bit rate packet transfer to fast- moving terminals in microcellular networks. To satisfy a smooth handover with fast movement, the concept of a logical macrocell (LMC) is introduced which consists of a number of adjacent microcells. A set of polling signals is emitted in parallel to every microcell in the LMC, and packets are transferred in one of the cells where the target mobile terminal exists. Polling ACK is multicast to every microcell in the LMC to synchronize the parallel polling. For exceptional cases, like polling ACK error, time-out re-polling should be set independently in each microcell in the LMC. Packet transfer throughput of each terminal depends on the packet size and ACK multicast delay. In the case of 200 μsec multicast delay, the throughput over a 100 Mbps packet-multiplexing medium is 7.171, 17.927 and 57.368 Mbps for 200, 500, and 1600 byte packets, respectively. The throughput in each base station depends on the packet size. It is 15.54, 31.5, and 59.54 Mbps for 200, 500 and 1600 byte packets, respectively. The throughput is shared by a number of mobile terminals in each microcell.