Communication method and apparatus in which first and second control channels operate as an initial acquisition channel and a broadcast channel, respectively

A transmitting method of forming a plurality of frequency channels by sectioning a selected frequency band provided for communication, of forming time slots by sectioning time, into predetermined periods of time, and of transmitting intermittently to an arbitrary number terminal devices in a frequency hopping sequence, said transmitting method comprising the steps of:

• generating a random number sequence;
• allocating a first control channel to a time slot designated in accordance with the generated random number sequence in a predetermined frequency channel from among said plurality of frequency channels;
• allocating a second control channel to a frequency channel designated in accordance with the generated random number sequence in a time slot located in a predetermined relation to said first control channel;
• providing said first control channel with the information of the generated random number sequence;
• providing said second control channel with the information for allocating the information transmitting channel to the time slots;
• and
• transmitting the control information including said first and second control channels.

A base station for forming a plurality of frequency channels by sectioning a selected frequency band provided for communication, for forming a plurality of time slots by sectioning time into predetermined periods of time, for communicating intermittently with an arbitrary number of terminal devices in frequency hopping sequence, said base station comprising:

• means for selecting a frequency channel from among said plurality of frequency channels;
• means for generating a random number sequence;
• means for allocating a first control channel to a time slot designated in accordance with the generated random number sequence in the selected frequency channel;
• means for allocating a second control channel to a frequency channel designated in accordance with the generated random number sequence in a time slot located in a predetermined relation to said first control channel;
• means for providing said first control channel with the information of the generated random number sequence;
• means for providing said second control channel with the information for allocating an information transmitting channel to the plurality of time slots;
• and
• means for transmitting the control information including the first and second control channels.

A terminal device for forming a plurality of frequency channels by sectioning a selected frequency band provided for communication, for forming a plurality of time slots by sectioning time into predetermined periods of time, and for communicating intermittently with a a base station in frequency hopping sequence, wherein said base station generates a random number sequence, allocates a first control channel to a time slot designated in accordance with the generated random number sequence in a predetermined frequency channel among the plurality of frequency channels, allocates a second control channel to a frequency channel designated in accordance with the generated random number sequence in a time slot located in a predetermined relation to said first control channel, provides said first control channel with the information of the random number sequence, provides said second control channel with the information for allocating an information transmitting channel to the plurality of time slots, and transmits control information including said first control channel and said second control channel, said terminal device comprising:

• first channel processing means for information communication;
• and
• second channel processing means for control information communication,
• wherein said second channel processing means receives said control information from said base station, determines the time slot wherein said first control channel exists in accordance with the information included in said first control channel, and determines the frequency channel wherein said second control channel exists.