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CDMA mobile communications system and communication method

  • US 20010033559A1
  • Filed: 06/15/2001
  • Published: 10/25/2001
  • Est. Priority Date: 08/10/1995
  • Status: Active Grant
First Claim
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1. A communication method in a code division multiple access (CDMA) mobile communication system wherein radio channels between a base station and a plurality of mobile stations include a plurality of traffic channels used for transmitting upward data packets directed from the mobile terminals to the base station and for transmitting downward data packets directed from the base station to the mobile terminals, a reservation channel used for transmitting reservation packets each indicative of a traffic channel assignment request from a mobile terminal to the base station, and a reply channel used for transmitting reply packets each indicative of a traffic channel through which data is to be transmitted and received from the base station to a mobile terminal, and said reservation, reply and traffic channels are assigned unique spreading codes, respectively, said method comprising the steps of:

  • transmitting a reservation packet from a mobile terminal having a request for data transmission onto said reservation channel at arbitrary timing;

    transmitting a reply packet onto said reply channel from the base station to specify a traffic channel and a time slot to be used to each mobile terminal which has transmitted said reservation packet; and

    transmitting a data packet from each mobile terminal which has transmitted said reservation packet in the specified time slot on the traffic channel specified by said reply packet.

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