Multiplex communications – Wide area network – Packet switching
Patent
1994-04-21
1996-09-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
455 383, H04J 300
Patent
active
055598048
ABSTRACT:
A wireless communication system includes a plurality of wireless terminals and a base station for periodically generating a fixed-length communication frame composed of an information field which includes a plurality of information slots, and first and second control fields which are arranged preceding the information field and each of which includes a plurality of time slots. Each time slot of the first control field of each communication frame is used for allowing the base station to send control data for designating a terminal which is to make the transmission or reception of data in one information slot of the information field, and each time slot of the second control field thereof is used for allowing one wireless terminal to send control data indicating a requirement for assignment of an information slot for data transmission. Each wireless terminal, when receiving control data inclusive of an address of that terminal in the i-th time slot of the first control field of each communication frame, makes the reception or transmission of data in the i-th information slot in the information field of that communication frame. When the control data is not found out in the first control field, the power source of a reception unit of the wireless terminal is turned off during a period of time until the next communication frame is generated.
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Adachi Shuichi
Amada Eiichi
Ishifuji Tomoaki
Ishii Gen'ichi
Jusa Hidehiko
Hitachi , Ltd.
Olms Douglas W.
Patel Ajit
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