Increasing Capacity in Wireless Communications

• US 20120281675A1
• Filed: 11/27/2009
• Published: 11/08/2012
• Est. Priority Date: 11/27/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Liang, Jiye, Fan, Mingxi, Xue, Yisheng
• Granted Patent: US 9,509,452 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0053 specially adapted for power saving
• CPC Class Codes: H04L 1/0067 Rate matching H04L1/0013 and H04L1/08 take precedence
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands

Abstract

Techniques to increase the capacity of a W-CDMA wireless communications system. In an exemplary embodiment, early termination (400) of one or more transport channels on a W-CDMA wireless communications link is provided. In particular, early decoding (421, 423) is performed on slots as they are received over the air, and techniques are described for signaling (431, 432) acknowledgment messages (ACK'"'"'s) for one or more transport channels correctly decoded to terminate the transmission of those transport channels. The techniques may be applied to the transmission of voice signals using the adaptive multi-rate (AMR) codec. Further exemplary embodiments describe aspects to reduce the transmission power and rate of power control commands sent over the air, as well as aspects for applying tail-biting convolutional codes (1015) in the system.

Claims

1. A method comprising:

receiving (510) symbols corresponding to a composite channel during a first allotted transmission time interval (TTI), the composite channel comprising at least two multiplexed transport channels;

attempting (540.1) to decode at least one transport channel prior to receiving all symbols of the first TTI; and

transmitting (560.1) an acknowledgement message (ACK) based on a successful decode, wherein the ACK is operable to cease transmission of the symbols during the first TTI.

2. The method of claim 1, further comprising receiving symbols corresponding to the composite channel during a second TTI following the first TTI.

3. The method of claim 1, the attempting comprising attempting to decode at least two transport channels prior to receiving all symbols of the first TTI.

4. The method of claim 3, the at least two transport channels comprising a first and a second transport channel, the attempting to decode comprising attempting to decode the second transport channel a predetermined time interval after attempting to decode the first transport channel.

5. The method of claim 3, the attempting to decode comprising simultaneously attempting to decode at least two transport channels.

6. The method of claim 1, each TTI further sub-divided into slots, the attempting to decode comprising attempting to decode once every fixed number of slots.

7. The method of claim 1, the transmitting the ACK comprising multiplexing the ACK transmission with a pilot transmission.

8. The method of claim 7, the multiplexing the ACK transmission comprising multiplexing in time.

9. The method of claim 7, the multiplexing the ACK transmission comprising multiplexing in code.

10. The method of claim 1, the at least two transport channels comprising at least two transport channels for carrying AMR class A, B, and C bits.

11. The method of claim 10, the method further comprising decoding data for at least one of the transport channels using a tail-biting convolutional code decoder.

12. The method of claim 1, the transmitting comprising transmitting on a downlink of a W-CDMA system, the receiving comprising receiving on an uplink of the W-CDMA system.

13. The method of claim 1, the transmitting comprising transmitting on an uplink of a W-CDMA system, the receiving comprising receiving on a downlink of the W-CDMA system.

14. The method of claim 1, further comprising:

receiving symbols corresponding to composite channels from at least two user equipments (UE'"'"'s), the attempting to decode comprising prioritizing decoding attempts for the at least two UE based on whether a UE is in soft hand-off.

15. An apparatus comprising:

a receiver (250) configured to receive symbols corresponding to a composite channel during a first allotted transmission time interval (TTI), the composite channel comprising at least two multiplexed transport channels;

a decoder (270) configured to attempt to decode at least one transport channel prior to receiving all symbols of the first TTI; and

a transmitter (430) configured to transmit an acknowledgement message (ACK) based on a successful result of the decoding, wherein the ACK is operable to cease transmission of the symbols during the first TTI.

16. The apparatus of claim 15, the receiver further configured to receive symbols corresponding to the composite channel during a second TTI following the first TTI.

17. The apparatus of claim 15, the decoder configured to attempt to decode at least two transport channels prior to receiving all symbols of the first TTI.

18. The apparatus of claim 17, the at least two transport channels comprising a first and a second transport channel, the decoder configured to attempt to decode the second transport channel a predetermined time interval after attempting to decode the first transport channel.

19. The apparatus of claim 17, the decoder configured to simultaneously attempt to decode at least two transport channels.

20. The apparatus of claim 15, each TTI further sub-divided into slots, the decoder configured to attempt to decode once every fixed number of slots.

21. The apparatus of claim 15, the transmitter configured to multiplex the ACK transmission with a pilot transmission.

22. The apparatus of claim 21, the transmitter configured to multiplex the ACK transmission with the pilot transmission in time.

23. The apparatus of claim 21, the transmitter configured to multiplex the ACK transmission in code.

24. The apparatus of claim 15, the at least two transport channels comprising at least two transport channels for carrying AMR class A, B, and C bits.

25. The apparatus of claim 24, the decoder comprising a tail-biting convolutional code decoder.

26. The apparatus of claim 15, the transmitter configured to transmit on a downlink of a W-CDMA system, the receiver configured to receive on an uplink of the W-CDMA system.

27. The apparatus of claim 15, the transmitter configured to transmit on an uplink of a W-CDMA system, the receiver configured to receive on a downlink of the W-CDMA system.

28. The apparatus of claim 26, the receiver further configured to receive symbols corresponding to composite channels from at least two user equipments (UE'"'"'s), the attempting to decode comprising prioritizing decoding attempts for the at least two UE based on whether a UE is in soft hand-off.

29. An apparatus comprising:

means for receiving (510) symbols corresponding to a composite channel during a first allotted transmission time interval (TTI), the composite channel comprising at least two multiplexed transport channels;

means for attempting (540.1) to decode at least one transport channel prior to receiving all symbols of the first TTI; and

means for transmitting (560.1) an acknowledgement message (ACK) based on a successful decode, wherein the ACK is operable to cease transmission of the symbols during the first TTI.

30. The apparatus of claim 29, the at least two transport channels comprising at least two transport channels for carrying AMR class A, B, and C bits.

31. A computer-readable storage medium storing instructions for causing a computer to:

receive (510) symbols corresponding to a composite channel during a first allotted transmission time interval (TTI), the composite channel comprising at least two multiplexed transport channels;

attempt (540.1) to decode at least one transport channel prior to receiving all symbols of the first TTI; and

transmit (560.1) an acknowledgement message (ACK) based on a successful decode, wherein the ACK is operable to cease transmission of the symbols during the first TTI.