UPLINK DELAY BUDGET FEEDBACK

• US 20090196275A1
• Filed: 02/03/2009
• Published: 08/06/2009
• Est. Priority Date: 02/04/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ho, Sai Yiu Duncan, Damnjanovic, Aleksandar
• Granted Patent: US 8,699,487 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

Systems and methodologies are described that facilitate signaling and/or utilizing uplink delay budget related feedback in a wireless communication environment. A lowest delay budget associated with a most urgent Radio Link Control (RLC) service data unit (SDU) retained in a buffer of an access terminal can be determined. Further, a portion of a Medium Access Control (MAC) header (e.g., two reserved bits, . . . ) can be configured to carry a code related to a delay threshold corresponding to the lowest delay budget. Moreover, the MAC header can be transferred to a base station. The base station can detect the code carried by the portion of the MAC header, and a delay threshold can be determined as a function of the detected code (e.g., utilizing a radio bearer specific mapping). According to an example, the access terminal can be scheduled for uplink transmission as a function of the delay threshold.

Claims

1. A method that facilitates providing uplink delay budget feedback in a wireless communication environment, comprising:

determining a lowest delay budget from a plurality of Radio Link Control (RLC) service data units (SDUs);

configuring a portion of a Medium Access Control (MAC) header to include at least one code corresponding to a delay threshold for the lowest delay budget; and

transmitting the MAC header to a base station.

2. The method of claim 1, wherein the lowest delay budget is a head-of-line delay budget that corresponds to an RLC SDU to be transmitted first from the plurality of RLC SDUs.

3. The method of claim 1, configuring the portion of the MAC header to include at least one code further comprises setting values of two reserved bits in the MAC header to convey the delay threshold associated with an RLC SDU to be transmitted first within a radio bearer.

4. The method of claim 1, configuring the portion of the MAC header to include at least one code further comprises setting values of two reserved bits in the MAC header according to a remaining delay budget of an RLC SDU that is not included in a current Transfer Block.

5. The method of claim 1, further comprising selecting one or more of the at least one code for inclusion in the MAC header based upon a mapping between delay thresholds and codes.

6. The method of claim 5, wherein each radio bearer is associated with a respective mapping between delay thresholds and codes.

7. The method of claim 5, wherein the mapping is configured by radio resource control (RRC) per radio bearer to associate four delay thresholds each with a respective one of four codes.

8. The method of claim 5, further comprising:

incorporating a logical channel identifier that is one-to-one mapped to a particular radio bearer in the MAC header; and

utilizing a particular mapping between delay thresholds and codes corresponding to the particular radio bearer to select the one or more of the at least one code for inclusion in the MAC header.

39. The computer program product of claim 38, wherein a radio bearer specific mapping between delay thresholds and codes is utilized to decipher the delay threshold that corresponds to the code.

9. A wireless communications apparatus, comprising:

a memory that retains instructions related to identifying a lowest delay budget from a plurality of Radio Link Control (RLC) service data units (SDUs), setting a portion of a Medium Access Control (MAC) header to include at least one code corresponding to a delay threshold for the lowest delay budget, and sending the MAC header to a base station; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

10. The wireless communications apparatus of claim 9, wherein the memory further retains instructions related to setting values of two reserved bits in the MAC header to convey the delay threshold associated with an RLC SDU to be transmitted first within a radio bearer.

11. The wireless communications apparatus of claim 9, wherein the memory further retains instructions related to establishing values of two reserved bits in the MAC header according to a remaining delay budget of an RLC SDU that is not included in a current Transfer Block.

12. The wireless communications apparatus of claim 9, wherein the memory further retains instructions related to choosing one or more of the at least one code for inclusion in the MAC header based upon a mapping between delay thresholds and codes.

13. The wireless communications apparatus of claim 12, wherein the mapping is configured by radio resource control (RRC) per radio bearer to associate four delay thresholds each with a respective one of four codes.

14. The wireless communications apparatus of claim 12, wherein the memory further retains instructions related to incorporating a logical channel identifier that is one-to-one mapped to a particular radio bearer in the MAC header, and employing a particular mapping between delay thresholds and codes corresponding to the particular radio bearer to choose the one or more of the at least one code for inclusion in the MAC header.

15. A wireless communications apparatus that enables signaling delay budget related feedback to a base station in a wireless communication environment, comprising:

means for identifying a Radio Link Control (RLC) service data unit (SDU) with a lowest delay budget from a set of RLC SDUs retained in a buffer awaiting uplink transmission;

means for configuring a portion of a Medium Access Control (MAC) header to include a code corresponding to a delay threshold associated with the lowest delay budget; and

means for sending the MAC header to a base station.

16. The wireless communications apparatus of claim 15, wherein the portion of the MAC header is two reserved bits.

17. The wireless communications apparatus of claim 16, wherein the two reserved bits convey the delay threshold associated with the RLC SDU with the lowest delay budget which is to be transmitted first within a radio bearer.

18. The wireless communication apparatus of claim 16, wherein the two reserved bits convey the delay threshold associated with the RLC SDU with the lowest delay budget excluded from a current Transfer Block.

19. The wireless communications apparatus of claim 15, further comprising means for selecting the code for inclusion in the MAC header based upon a mapping between delay thresholds and codes.

20. The wireless communications apparatus of claim 19, wherein the mapping is configured by radio resource control (RRC) per radio bearer to associate four delay thresholds each with a respective one of four codes.

21. A computer program product, comprising:

a computer-readable medium comprising;

code for identifying a Radio Link Control (RLC) service data unit (SDU) with a lowest delay budget from a set of RLC SDUs retained in a buffer awaiting uplink transmission;

code for setting values of two reserved bits included in a Medium Access Control (MAC) header to convey a delay threshold associated with the lowest delay budget; and

code for sending the MAC header to a base station.

22. The computer program product of claim 21, wherein the values of the two reserved bits included in the MAC header convey the delay threshold associated with the RLC SDU with the lowest delay budget which is to be transmitted first within a radio bearer.

23. The computer program product of claim 21, wherein the values of the two reserved bits included in the MAC header convey the delay threshold associated with the RLC SDU with the lowest delay budget excluded from a current Transfer Block.

24. The computer program product of claim 21, wherein the computer-readable medium further comprises code for selecting the values of the two reserved bits as a function of a mapping configured by radio resource control (RRC) per radio bearer.

25. In a wireless communications system, an apparatus comprising:

a processor configured to;

determine a lowest delay budget from a plurality of Radio Link Control (RLC) service data units (SDUs);

configure a portion of a Medium Access Control (MAC) header to include at least one code corresponding to a delay threshold for the lowest delay budget; and

transmit the MAC header to a base station.

26. A method that facilitates obtaining uplink delay budget feedback in a wireless communication environment, comprising:

receiving a Medium Access Control (MAC) header from an access terminal;

detecting a code carried by a portion of the MAC header;

determining a delay threshold that corresponds to the code, the delay threshold being a range that includes a lowest delay budget associated with a particular Radio Link Control (RLC) service data unit (SDU) from a set of RLC SDUs retained in a buffer of the access terminal; and

scheduling the access terminal for uplink transmission based at least in part upon the delay threshold.

27. The method of claim 26, wherein the code is carried by two reserved bits of the MAC header.

28. The method of claim 26, wherein values of the two reserved bits of the MAC header convey the delay threshold associated with the particular RLC SDU, which is excluded from a current Transfer Block.

29. The method of claim 26, further comprising determining the delay threshold that corresponds to the code by employing a mapping between delay thresholds and codes.

30. The method of claim 29, wherein the mapping is associated with a particular radio bearer and is configured by radio resource control (RRC).

31. A wireless communications apparatus, comprising:

a memory that retains instructions related to detecting a code carried by a portion of a Medium Access Control (MAC) header received from an access terminal, identifying a delay threshold that corresponds to the code, the delay threshold relates to a delay budget of a Radio Link Control (RLC) service data unit (SDU) retained in a buffer of the access terminal, and scheduling the access terminal for uplink transmission based at least in part upon the delay threshold; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

32. The wireless communication apparatus of claim 31, wherein the code is carried by two reserved bits of the MAC header.

33. The wireless communication apparatus of claim 32, wherein values of the two reserved bits of the MAC header convey the delay threshold associated with the RLC SDU, which is excluded from a current Transfer Block.

34. The wireless communications apparatus of claim 31, wherein a mapping configured by radio resource control (RRC) per radio bearer is employed to identify the delay threshold that corresponds to the code.

35. A wireless communications apparatus that enables obtaining delay budget related feedback from an access terminal in a wireless communication environment, comprising:

means for receiving a Medium Access Control (MAC) header from an access terminal;

means for detecting a code carried by a subset of bits of the MAC header; and

means for deciphering a delay threshold that corresponds to the code, the delay threshold relates to a head-of-line delay budget of a Radio Link Control (RLC) service data unit (SDU) retained in a buffer of the access terminal.

36. The wireless communications apparatus of claim 35, further comprising means for scheduling the access terminal for uplink transmission as a function of the delay threshold.

37. The wireless communications apparatus of claim 35, wherein a radio bearer specific mapping between delay thresholds and codes is employed to identify the delay threshold that corresponds to the code.

38. A computer program product, comprising:

a computer-readable medium comprising;

code for receiving a Medium Access Control (MAC) header from an access terminal;

code for detecting a code carried by a subset of bits of the MAC header;

code for deciphering a delay threshold that corresponds to the code, the delay threshold relates to a head-of-line delay budget of a Radio Link Control (RLC) service data unit (SDU) retained in a buffer of the access terminal; and

code for scheduling the access terminal for uplink transmission as a function of the delay threshold.

40. In a wireless communications system, an apparatus comprising:

a processor configured to;

detect a code carried by two reserved bits included in a Medium Access Control (MAC) header received from an access terminal;

determine a delay threshold that corresponds to the code, the delay threshold being a range that includes a lowest delay budget associated with a particular Radio Link Control (RLC) service data unit (SDU) from a set of RLC SDUs retained in a buffer of the access terminal; and

schedule the access terminal for uplink transmission based at least in part upon the delay threshold.