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1. WO2007010349 - TECHNIQUES TO TRANSMIT DATA RATE CONTROL SIGNALS FOR MULTI-CARRIER WIRELESS SYSTEMS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

WHAT IS CLAIMED IS:

1. A method comprising:
determining a data rate control (DRC) value for each of a plurality of carriers(410);
spreading the plurality of DRC values (420);
transmitting at least one of the plurality of spread DRC values via an in-phase (I) channel and at least one of the plurality of spread DRC values via a quadrature-phase (Q) channel (430).

2. The method of claim 1 wherein the determining comprises:
measuring a channel quality parameter for each of the plurality of carriers

(412);
determining a data rate control (DRC) value identifying a data rate for each of the plurality of carriers based on the measuring (414).

3. The method of claim 2 wherein the measuring comprises:
receiving a pilot signal associated with each carrier; and
measuring a signal to-noise-ratio or other channel quality parameter for each pilot signal.

4. The method of claim 1 wherein the spreading comprises spreading the plurality of DRC values using a Walsh code corresponding to a wireless sector.

5. The method of claim 1 wherein the spreading comprises:
determining a wireless sector from which to receive data via a forward link channel;
spreading the plurality of DRC values using a Walsh code corresponding to the determined wireless sector.

6. The method of claim 1 wherein the spreading comprises:
determining a Walsh code for each of the carriers;
spreading each DRC value using the Walsh code corresponding to the carrier.

7. The method of claim 6 wherein the spreading comprises spreading each DRC value using a different Walsh code for each of the carriers.

8. The method of claim 1 wherein the spreading comprises:
spreading the plurality of DRC values using a DRC cover code corresponding to a wireless sector (422); and
further spreading each spread DRC value using a code corresponding to the carrier for the DRC value (424).

9. The method of claim 1 wherein the determining comprises determining a first data rate control (DRC) value for a first carrier, a second DRC value for a second carrier, and a third DRC value for a third carrier;
wherein the spreading comprises spreading the first, second and third DRC values; and :
wherein the transmitting comprises:
transmitting the first spread DRC value via an in-phase (I) channel;
and
transmitting the second and third spread DRC values via a quadrature- phase (Q) channel.

10. The method of claim 1 wherein the determining comprises determining a first data rate control (DRC) value for a first carrier, a second DRC value for a second carrier, a third DRC value for a third carrier, and a fourth DRC value for a fourth carrier;
wherein the spreading comprises spreading the first, second, third and fourth DRC values; and
wherein the transmitting comprises:
transmitting the first spread DRC value via an in-phase (I) channel;
and
transmitting the second, third and fourth spread DRC values via a quadrature-phase (Q) channel.

11. The method of claim 1 wherein the transmitting comprises transmitting a first of the plurality spread DRC values via an in-phase channel and transmitting a second of the plurality of spread DRC values via a Quadrature phase (Q) channel.

12. A wireless apparatus (200 or 500) adapted to:
determine data rate control (DRC) values for each of a plurality of forward link carriers;
transmit via a reverse link channel at least a first of the DRC values via an in-phase (I) channel and at least a second of the DRC values via a Quadrature-phase (Q) channel.

13. The wireless apparatus of claim 12 wherein the wireless apparatus is at least partially compliant with CDMA2000 EV-DO Revision B/3GPP2 C.S0024-B.

14. The wireless apparatus of claim 12 wherein the apparatus is operating in an asymmetric multicarrier mode in which a number of the forward link carriers used for data transmission is greater than a number of reverse link carriers used to transmit DRC values for the forward link carriers. •

15. The wireless apparatus of claim 12 and further comprising:
a bi-orthogonal encoder (210) adapted to encode the DRC values;
a first multiplier (214) adapted to spread the encoded DRC values using a DRC cover code corresponding to a wireless sector; and
a second multiplier (218) adapted to further spread each DRC value using a Walsh code corresponding to the carrier for the DRC value.

16. A wireless apparatus (200 or 500) adapted to transmit at least a first data rate control (DRC) value via an in-phase (I) channel and at least a second DRC value via a Quadrature-phase (Q) channel, the first DRC value associated with a first forward link carrier and the second DRC value associated with a second forward link carrier.

17. The wireless apparatus of claim 16 wherein the wireless apparatus is compliant with CDMA2000 EV-DO Revision B/3GPP2 C.S0024-B.

18. The wireless apparatus of claim 16 and further comprising:
a bi-orthogonal encoder (210) adapted to encode the DRC values;
a first multiplier (214) adapted to spread the encoded DRC values using a DRC cover code corresponding to a wireless sector; and
a second multiplier (218) adapted to further spread the first DRC value using a Walsh code corresponding to the first carrier, and to further spread the second DRC value using a Walsh code corresponding to the second carrier.