Patent ID: 7634581

Claim:
An access point forming a limited service area for a radio LAN (Local Area Network), said access point comprising: a transmitter for spreading an information signal in a direct spread spectrum system, which spreads a frequency band width of the information signal, and transmitting a spread information signal; and a receiver for receiving the spread information signal and inversely spreading said spread information signal; said transmitter comprising: a plurality of information transmitting circuits each for multiplying, in the direct spread spectrum system, the information signal and a particular one of a plurality of spread codes; and a transmission controller for selecting, in accordance with at least one of a kind and an amount of the information signal, one of a plurality of frequency bands and frequencies respectively assigned to said plurality of information transmitting circuits and one of a plurality of packets to use for transmission of the information signal, and maintaining transmission power of the spread information signal semi-fixed, wherein the kind of the information signal is any one of a control packet sent from said access point to a station present in said limited service area, a channel packet for data and a channel packet for voice.