P.T. Hoa and T. Yamada (Japan)
Double-tier network, unified micro cellular network, fast moving terminal, parallel polling, logical macro-cell.
This paper presents advantages of a Unified Micro Cellular (UMIC) network in which all coverage cells are of micro-size. MM-MAN (Mobile Multimedia Metropolitan Area Network) has been discussed as a high speed mobile network which is deployed along the roads in metropolitan area is a part of the UMIC network, and required to support fast moving terminals (FMTs). Handover of FMT between micro-cells in MM-MAN is processed quickly enough by prior preparation mechanism in the wired as well as wireless network. LMC (Logical Macro Cell) which merges virtually several adjacent micro-cells together based upon IP multicast to spread data packets out at all cells within LMC. Identical polling for FMT is sent from all base stations (BSs) covered by a LMC where FMT are moving to grant access permission to FMT as soon as it gets in a new cell. Compared to the double-tier network the UMIC network can provide more resource for FMT. According to our evaluation presented in this paper, the UMIC network is able to support 1000 times more channels for FMT than the double-tier system. This justifies somewhat inefficient resource usage due to our parallel polling scheme. Moreover, handover latency achieved by parallel polling is 10 times less than contention-based scheme. This amount of handover delay is much appropriate for time-critical applications.
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