Another double tier to avoid local congestion in a unified microcellular network

This paper proposes a unified micro-cellular network for future multimedia communications, and proves that its capacity can be several thousand times bigger than today's widely accepted double-tier architectures in which low speed terminals are accommodated in micro-cells whereas fast terminals are served in overlapped macro-cells. In the unified micro-cellular network, micro-cells are deployed along major roads of a metropolitan area to offer high bit-rate packet transfer to fast moving terminals. A set of polling is emitted in parallel in several adjacent micro-cells, configured to a logical macro-cell (LMC), and the LMC formation is changed following the movement of the fast terminal (more than 100km/h) to avoid frequent handovers. Moreover, to prevent local congestions which can easily happen in cells of e.g. a road junction, a new double-tier structure is proposed so that pico-cells are included in micro-cells with frequent local congestion. Pico-cell does not affect neighbor-cells, since it is enclosed in the target micro-cell. The capacity increase of the target micro-cell depends on the size and the channel number of each deployed pico-cell