A radio communication system in which a plurality of wireless terminals form wireless channels separately between a common base station unit and wireless terminals and communicate with the base station unit, the radio communications system comprises quality managing section manages communication quality of wireless channel for each of wireless terminals by assigning occupied band of wireless channel on basis of a predetermined parameter, channel securing section secures continuously wireless channel for at least one wireless terminal by controlling data rate of the wireless channel according to change in channel state between wireless sections, and rate change detecting section supplies trigger information to quality managing section when data rate of at least one wireless channel changes as a result of control performed by channel securing section, the quality managing section, when being given trigger, updating occupied band assigned state of the wireless channel for each of wireless terminals.

 
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< Handoff method comprising network control apparatus that receives data packets from both the core network and the other network control apparatus wherein said received data packets will be transformed into wireless data

< Polar modulating circuit, polar coordinate modulating method, integrated circuit and radio transmission device

> Integrated tracking filters for direct conversion and low-IF single conversion broadband filters

> Non-circular paging areas

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