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In this paper, we show the concept of a beyond 3G cellular and hotspot (B3GC&HS) communication system, based on the results of our research and development (R&D). In the proposal, we use a packet-reservation-based protocol: packet reservation dynamic time-slotted multiple access (PR-DSMA). Based on the protocol, we can select the physical layer (PHY) from OFDM based PHY and single carrier based PHY adaptively to suit the user environment. In this paper, we especially show our R&D results on hot-spot communication systems based on single carrier based PHY and PR-DSMA. In the presentation, we show some prototypes on the MAC layer and PHY layer.