Claims
- 1. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
- establishing a periodic reference instant at the base station and at the remote station;
- determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit;
- transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval; and
- wherein said periodic reference instant is established by a beginning subframe count instant that is incremented by a packet count value at the base station and at the remote unit.
- 2. The method of claim 1, wherein said delay interval is determined by a value N of a quantity of M least significant bits of said unique identification value of said remote unit, the delay interval being an interval required for the occurrence of a plurality of N of said beginning subframe count instants.
- 3. The method of claim 2, wherein said remote unit changes from said sleep mode to a standby mode after said delay interval.
- 4. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
- establishing a periodic reference instant at the base station and at the remote unit;
- determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit;
- attempting to initiate a communication from said base station to said remote unit;
- concluding at the base station that the remote unit is in a sleep mode if said attempting step fails to initiate communications with the remote unit;
- waiting for said delay interval following said periodic reference instant at the base station;
- transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval; and
- wherein said periodic reference instant is established by a beginning subframe count instant that is incremented by a packet count value at the base station and at the remote unit.
- 5. The method of claim 4, wherein said delay interval is determined by a value N of a quantity of M least significant bits of said unique identification value of said remote unit, the delay interval being an interval required for the occurrence of a plurality of N of said beginning subframe count instants.
- 6. The method of claim 5, wherein said remote unit changes from said sleep mode to a standby mode after said delay interval.
- 7. A highly bandwidth-efficient communications method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
- establishing a periodic reference instant at the base station and at the remote unit;
- determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit;
- receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies;
- adaptively despreading the signals received at the base station by using despreading weights;
- attempting to initiate a communication from said base station to said remote unit;
- concluding at the base station that the remote unit is in said sleep mode if said attempting step fails to initiate communications with the remote unit;
- waiting for said delay interval following said periodic reference instant at the base station;
- transmitting at the base station to the remote unit a spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies; and
- wherein said periodic reference instant is established by a beginning subframe count instant that is incremented by a packet count value at the base station and at the remote unit.
- 8. The method of claim 7, wherein said delay interval is determined by a value N of a quantity of M least significant bits of said unique identification value of said remote unit, the delay interval being an interval required for the occurrence of a plurality of N of said beginning subframe count instants.
- 9. The method of claim 8, wherein said remote unit changes from said sleep mode to a standby mode after said delay interval.
CROSS-REFERENCES TO RELATED APPLICATIONS:
The invention disclosed herein is related to the copending U.S. patent application by Alamouti, et al., entitled "METHOD FOR FREQUENCY DIVISION DUPLEX COMMUNICATIONS", Ser. No. 08/796,584, filed on Feb. 6, 1997, assigned to AT&T, and incorporated herein by reference.
US Referenced Citations (4)
Non-Patent Literature Citations (2)
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