HARQ ACK/NAK coding for a communication device during soft handoff

• US 20040219917A1
• Filed: 04/30/2003
• Published: 11/04/2004
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Love, Robert T., Stewart, Kenneth A., Kuchibhotla, Ravi, Ghosh, Amitava, Whinnett, Nicholas W.
• Granted Patent: US 7,013,143 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for rate selection by a communication device for enhanced uplink during soft handoff in a wireless communication system includes a first step of receiving information from a scheduler. This information can include one or more of scheduling, a rate limit, a power margin limit, and a persistence. A next step includes determining a data rate for an enhanced uplink during soft handoff using the information. A next step includes transmitting to a serving base station on an enhanced uplink channel at the data rate determined from the determining step.

Claims

1. A method for improving uplink performance for a communication device in a wireless communication system, the method comprising steps of:

defining coded bits that uniquely identify a particular communication device;

applying the coded bits to a downlink ACK/NAK transmission that can be received by a plurality of communication devices;

discriminating between ACK/NAK transmissions meant for the particular communication device and ACK/NAK transmissions meant for other communication devices using the coded bits from the applying step; and

utilizing the information in the ACK/NAK transmission coded for the particular communication device in determining uplink transmission activity.

2. The method of claim 1, wherein the coded bits are applied to a field in the downlink physical control channel.

3. The method of claim 1, wherein the coded bits are applied to a downlink ACK/NAK code channel.

4. The method of claim 3, further comprising the step of allocating two sets of ACK/NAK channels to each BTS.

5. The method of claim 4, further comprising the step of using one ACK/NAK channel in a first set of ACK/NAK channels if a first BTS schedules the communication device and optionally using one ACK/NAK channel in a second set of ACK/NAK channels by the first BTS if other than the first BTS schedules the communication device.

6. The method of claim 3, wherein the communication device includes an ACK/NAK code channel indicator in an uplink control channel, wherein only the non-scheduling Active Set BTS'"'"'s use the ACK/NAK code channel indicator.

7. The method of claim 3, wherein the communication device includes an ACK/NAK code channel indicator in an uplink control channel, wherein all of the Active Set BTSs use the ACK/NAK code channel indicator for choosing the appropriate ACK/NAK channel from the ACK/NAK code channel set.

8. The method of claim 1, wherein the defining step includes defining second code bits based on a selected scheduling BTS'"'"'s unique ID, and the utilizing step includes applying the second code bits to the uplink communication such that the BTS'"'"'s can determine whether it is selected or not.

9. The method of claim 1, wherein the defining step includes the step of receiving site selection diversity transmit cell ID code bits, and wherein the utilizing step includes utilizing the cell ID code bits to indicate which BTS is selected.

10. A method for improving uplink performance for a communication device in a wireless communication system, the method comprising steps of:

defining coded bits that uniquely identify a particular communication device;

applying the coded bits to a downlink ACK/NAK transmission in a downlink ACK/NAK code channel that can be received by a plurality of communication devices;

discriminating between ACK/NAK transmissions meant for the particular communication device and ACK/NAK transmissions meant for other communication devices using the coded bits from the applying step; and

utilizing the information in the ACK/NAK transmission coded for the particular communication device in determining uplink transmission activity.

11. The method of claim 10, further comprising the step of allocating two sets of ACK/NAK channels for each BTS.

12. The method of claim 11, further comprising the step of using one ACK/NAK channel in a first set of ACK/NAK channels if a first BTS schedules the communication device and optionally using one ACK/NAK channel in a second set of ACK/NAK channels by the first BTS if other than the first BTS schedules the communication device.

13. The method of claim 12, wherein the communication device includes an ACK/NAK code channel indicator in an uplink control channel, wherein only the non-scheduling Active Set BTS'"'"'s use the ACK/NAK code channel indicator.

14. The method of claim 11, wherein the communication device includes an ACK/NAK code channel indicator in an uplink control channel, wherein all of the Active Set BTSs use the ACK/NAK code channel indicator for choosing the appropriate ACK/NAK channel from the ACK/NAK code channel set.

15. The method of claim 10, wherein the defining step includes defining second code bits based on a selected scheduling BTS'"'"'s unique ID, and the utilizing step includes applying the second code bits to the uplink communication such that the BTS'"'"'s can determine whether it is selected or not.

16. The method of claim 10, wherein the defining step includes the step of receiving site selection diversity transmit cell ID code bits, and wherein the utilizing step includes utilizing the cell ID code bits to indicate which BTS is selected.

17. A method for improving enhanced uplink performance during soft handoff for a communication device in a UMTS communication system, the method comprising steps of:

defining coded bits that uniquely identify a particular communication device;

applying the coded bits to a downlink ACK/NAK transmission in a downlink ACK/NAK code channel that can be received by a plurality of communication devices;

discriminating between ACK/NAK transmissions meant for the particular communication device and ACK/NAK transmissions meant for other communication devices using the coded bits from the applying step;

allocating two sets of ACK/NAK channels for every BTS; and

using one ACK/NAK channel in a first set of ACK/NAK channels if a first BTS schedules the communication device and optionally using one ACK/NAK channel in a second set of ACK/NAK channels by the first BTS if other than the first BTS schedules the communication device.

18. The method of claim 17, wherein the communication device includes an ACK/NAK code channel indicator in an uplink control channel, wherein only the non-scheduling Active Set BTS'"'"'s use the ACK/NAK code channel indicator.

19. The method of claim 17, wherein the defining step includes defining second code bits based on a selected scheduling BTS'"'"'s unique ID, and the utilizing step includes applying the second code bits to the uplink communication such that the BTS'"'"'s can determine whether it is selected or not.

20. The method of claim 17, wherein the defining step includes the step of receiving site selection diversity transmit cell ID code bits, and wherein the utilizing step includes utilizing the cell ID code bits to indicate which BTS is selected.