Efficient partitioning of control and data fields

• US 7,940,687 B2
• Filed: 06/07/2006
• Issued: 05/10/2011
• Est. Priority Date: 11/16/2005
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sampath, Ashwin
• Primary Examiner(s): Chou; Albert T
• Application Number:
  US11/449,218
• Publication Number:
  US 20070109988A1
• Time in Patent Office: 1,798 Days
• Field of Search: 370/442, 370/329, 370/347, 370/349, 455/522
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements

Abstract

Embodiments describe efficient tradeoff of latencies with processing times. A single control field can be placed within a frame to tradeoff encoding time with decoding time. Alternatively, a control field can be split into two portions to achieve good latency performance while maintaining sufficient processing time for scheduling, encoding and decoding. In accordance with some embodiments, a ACK/NACK field on one hop can serve the dual purpose of being a request for resources on the next hop in a multi-hop system. Also described is implicit acknowledgment monitoring that can improve latency performance.

Claims

1. A method for data communication, comprising:

determining a time division between an encoding time and a decoding time by an apparatus; and

selectively placing a control field within a flame of a data transmission based in part on the determined time division by the apparatus.

2. The method of claim 1, selectively placing a control field further comprising:

placing the control field right of a slot center if the decoding time is longer than the encoding time or placing the control field left of the slot center if the decoding time is shorter than the encoding time.

3. The method of claim 1, selectively placing a control field further comprising:

splitting the control field into at least two portions; and

providing a request field as part of one of the at least two portions of the control field.

4. The method of claim 1, further comprising:

dividing the control field into a first portion and a second portion;

placing in the first portion of the control field at least one of a REQUEST, a PILOT, and a control information; and

placing in a second portion of the control field at least one of a GRANT, an ACK/NACK, and information relating to assignment of resources or decoding outcome.

5. The method of claim 4, further comprising:

placing the first portion of the control field at a start of the frame; and

placing the second portion of the control field at a location within the frame based in part on the determined time division.

6. The method of claim 1, further comprising:

decoding an acknowledgment sent by a node at a prior hop; and

using the decoded acknowledgment as an implicit request for resources.

7. The method of claim 1, wherein the control field comprises a request field, a grant field, and an acknowledgment/negative acknowledgment field.

8. The method of claim 1, further comprising:

determining whether to place an anticipatory request in the frame based on a probability of a relay node to successfully decode a packet; and

placing the anticipatory request in the frame by a transmitting node based on the anticipatory request determination.

9. The method of claim 8, if the determination indicates the anticipatory request should not be placed in the frame, the method further comprising:

determining whether to place an additional request field in the second portion of the control field based on whether the frame is being transmitted in HARQ mode; and

including the additional request field by the transmitting node based on the additional request field determination.

10. The method of claim 9, if the determination indicates the additional request field should not be placed in the second portion of the control field, the method further comprising monitoring an implicit request by a receiving node.

11. The method of claim 1, wherein placing the control field within the frame is based in part on a scheduling time.

12. The method of claim 1, wherein placing the control field within the frame is based in part on a hop delay time.

13. The method of claim 1, further comprising communicating the placement of the control field within the frame to an access point or access terminal.

14. An apparatus for data communication, comprising:

a time partition module that determines a time partition between an encoding time and a decoding time; and

a slot placement module that determines placement of the control field within a frame of a data transmission based in part on the determined time partition.

15. The apparatus of claim 14, wherein the slot placement module places the single control field right of a slot center if the decoding time is longer than the encoding time or left of the slot center if the decoding time is shorter than the encoding time.

16. The apparatus of claim 14, wherein the time partition module splits the control field into two portions and locates a request field in one of the two portions.

17. The apparatus of claim 16, wherein the time partition module places a REQUEST and a PILOT in a first portion of the divided control field and places a GRANT and an ACK/NACK in a second portion of the divided control field.

18. The apparatus of claim 14, wherein the control field comprises a request field, a grant field, and an acknowledgment/negative acknowledgment field.

19. A computer readable non-transitory medium having stored thereon computer-executable instructions for data communication, the instructions being configured to:

determine a time division between an encoding time and a decoding time; and

selectively place a control field within a frame of a data transmission based in part on the determined time division.

20. The computer readable non-transitory medium of claim 19, the instructions further being configured to:

place the control field right of a slot center if the decoding time is longer than the encoding time or placing the control field left of the slot center if the decoding time is shorter than the encoding time.

21. An apparatus for data communication comprising:

means for determining a time division between an encoding time and a decoding time; and

means for selectively placing a control field within a frame of data transmission on based in part on the determined time division.