Varied transmission time intervals for wireless communication system

• US 8,644,292 B2
• Filed: 10/27/2005
• Issued: 02/04/2014
• Est. Priority Date: 08/24/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Teague, Edward H., Khandekar, Aamod
• Primary Examiner(s): Edouard, Patrick
• Assistant Examiner(s): Casca, Fred A
• Application Number:
  US11/260,932
• Publication Number:
  US 20070047485A1
• Time in Patent Office: 3,022 Days
• Field of Search: 370/468, 370/329, 370/349, 370/341, 370/348, 370/335, 370/491, 370/412, 370/342, 370/441, 375/260, 375/267, 375/148, 375/220, 455/442, 455/522, 455/452.2
• US Class Current: 370/349
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Embodiments describe a varied transmission time interval in wireless communication system. According to some embodiments is a method for assigning a transmission time interval. The method can include measuring a channel condition and/or a data rate of packet communicated by at least one wireless device. Based in part on the data rate and/or channel condition information, a determination can be made whether to schedule a long transmission time interval or a short transmission time interval to the packet. A long transmission time interval can be scheduled if the channel condition is poor and/or there is a low data rate. A short transmission time interval can be scheduled if the channel condition is good and/or the data rate is high or fast. The method can be repeated for multiple wireless devices. Also included is an alternative interlacing structure that supports both long transmission time intervals and short transmission time intervals.

Claims

1. A method for assigning a transmission time interval, comprising:

measuring a channel condition based on at least one packet communicated by at least one wireless device;

ascertaining a data rate associated with the at least one wireless device;

determining whether to schedule a long transmission time interval or a short transmission time interval for an encoded packet based on the measured channel condition and the ascertained data rate; and

indicating an interlacing structure from at least one of a plurality of interlacing structures for the encoded packet, wherein the interlacing structure for the encoded packet is indicated by adding an extra bit to a forward link assignment message (FLAM) or a reverse link assignment message (RLAM).

2. The method of claim 1, further comprising:

scheduling a long transmission time interval if the channel condition is poor and there is a low data rate.

3. The method of claim 2, wherein the interlacing structure for the encoded packet comprises an interlace of three for a forward and a reverse link.

4. The method of claim 1, further comprising:

scheduling a short transmission time interval if the channel condition is good and the data rate is high.

5. The method of claim 3, wherein the interlacing structure for the encoded packet comprises an interlace of six for a forward and a reverse link.

6. The method of claim 1, further comprising:

measuring a channel condition of at least a second wireless device;

ascertaining a data rate associated with the at least a second wireless device;

determining whether to schedule a long transmission time interval or a short transmission time interval to the at least a second wireless device based in part on the measured channel condition and the ascertained data rate of the at least a second wireless device; and

transmitting the transmission time interval of the first wireless device at substantially the same time as the transmission time interval of the second wireless device.

7. A processor that executes instructions for assigning one of multiple transmission time intervals to a user device, comprising:

an optimizer that analyzes a condition of a wireless data packet and a data rate of the wireless data packet; and

a scheduler that schedules a transmission time interval for an encoded packet, wherein the transmission time interval is either one of a long transmission time interval or a short transmission time interval and that indicates an interlacing structure from at least one of a plurality of interlacing structures for the encoded packet, and that communicates the interlacing structure for the encoded packet by adding an extra bit to a forward link assignment message (FLAM) or a reverse link assignment message (RLAM).

8. The processor of claim 7, the scheduler schedules a long transmission time interval if the analyzed condition is poor or if the data rate is low.

9. The processor of claim 8, wherein the interlacing structure for the encoded packet comprises an interlace of three for a forward and a reverse link.

10. The processor of claim 9, the scheduler schedules a short transmission time interval if the analyzed condition is good or if the data rate is high.

11. The processor of claim 10, wherein the interlacing structure for the encoded packet comprises an interlace of six for a forward and a reverse link.

12. The processor of claim 7, wherein the forward-link assignment message (FLAM) is transmitted on the forward-link prior to or at substantially the same time as a forward-link packet transmission.

13. The processor of claim 7, wherein the forward-link assignment message (FLAM) is transmitted on the forward-link prior to a reverse-link packet transmission.

14. A scheduler that schedules a user device to bandwidth and a transmission time interval, comprising:

a bandwidth module that determines a bandwidth to apply to each user device;

a transmission time interval module that establishes whether each user device should have a short transmission time interval or a long transmission time interval; and

wherein the scheduler indicates an interlacing structure from at least one of a plurality of interlacing structures for each user device by adding an extra bit to a forward link assignment message (FLAM) or a reverse link assignment message (RLAM) to indicate the interlacing structure for each user device.

15. The scheduler of claim 14, the transmission time interval module further receives channel condition information and data rate information.

16. The scheduler of claim 15, a short transmission time interval is scheduled if the channel condition is good and the data rate is fast.

17. The scheduler of claim 16, wherein the interlacing structure for each user device comprises an interlace of six for a forward and a reverse link.

18. The scheduler of claim 16, a long transmission time interval is scheduled if the channel condition is moderate and the data rate is slow.

19. The scheduler of claim 18, wherein the interlacing structure for each user device comprises an interlace of three for a forward and a reverse link.

20. An apparatus for scheduling wireless user devices to different transmission time intervals, comprising:

means for ascertaining a channel condition for each user device;

means for indicating an interlacing structure from at least one of a plurality of interlacing structures for each user device by adding an extra bit to a forward link assignment message (FLAM) or a reverse link assignment message (RLAM) to indicate the interlacing structure for each user device; and

means for scheduling each user device a respective transmission time interval.

21. The apparatus of claim 20, further comprising:

means for communicating the respective transmission time interval along with a wireless communication.

22. The apparatus of claim 20, the user device is scheduled either a short transmission time interval or a long transmission time interval based in part on the channel condition and the data rate.

23. The apparatus of claim 20, wherein the interlacing structure for each user device comprises an interlace of six for a forward and a reverse link.

24. The apparatus of claim 20, wherein the interlacing structure for each user device comprises an interlace of three for a forward and a reverse link.

25. A non-transitory computer-readable medium having stored thereon computer-executable instructions for:

detecting a packet channel condition;

ascertaining a packet data rate;

scheduling a long transmission time interval or a short transmission time interval to an encoded packet based in part on the detected channel condition and the ascertained data rate; and

indicating an interlacing structure from at least one of a plurality of interlacing structures for the encoded packet, wherein the interlacing structure for the encoded packet is indicated by adding an extra bit to a forward link assignment message (FLAM) or a reverse link assignment message (RLAM).

26. The non-transitory computer-readable medium of claim 25, further comprising instructions for:

scheduling a long transmission time interval if the packet channel condition is poor or the data rate is slow.

27. The non-transitory computer-readable medium of claim 26, wherein the interlacing structure for the encoded packet comprises an interlace of three for a forward and a reverse link.

28. The non-transitory computer-readable medium of claim 25, further comprising instructions for:

scheduling a short transmission time interval if the packet channel condition is good or the data rate is fast.

29. The non-transitory computer-readable medium of claim 28, wherein the interlacing structure for the encoded packet comprises an interlace of six for a forward and a reverse link.