Wireless communication method and apparatus for processing enhanced uplink scheduling grants

• US 20070049309A1
• Filed: 06/29/2006
• Published: 03/01/2007
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: Guangdong OPPO Electronics Industry Company Limited (BBK Electronics Corp., Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zhang, Guodong, Pan, Jung-Lin, Terry, Stephen, Wang, Peter
• Granted Patent: US 7,613,157 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method and apparatus for processing enhanced uplink scheduling grants are disclosed. A wireless transmit/receive unit (WTRU) detects an absolute grant (AG) and a relative grant (RG). Once the WTRU detects an AG or a RG, a new serving grant (SG) is generated and a hybrid automatic repeat request process may be activated or deactivated depending on whether the received AG is a primary AG or a secondary AG, whether a scheduling mode is a primary AG mode or a secondary AG mode, whether an AG value is set to “INACTIVE” and whether a transmission time interval is 2 ms or 10 ms. A Node-B may send a secondary AG to the WTRU before switching from a primary AG mode to a secondary AG mode and may send the secondary AG only if there is no out-of-date secondary AG exists, which may be detected by implementing a time threshold.

Claims

1. In a wireless communication system which supports enhanced uplink (EU) such that a wireless transmit/receive unit (WTRU) receives an absolute grant (AG) from a serving radio link set (RLS) via an enhanced dedicated channel (E-DCH) absolute grant channel (E-AGCH) and a relative grant (RG) from the serving RLS and a non-serving radio link (RL) via an E-DCH relative grant channel (E-RGCH), a method for generating a serving grant (SG), the method comprising:

detecting a scheduling grant which includes an AG and an RG;

determining whether the scheduling grant is an AG;

if the scheduling grant is an AG, determining whether the scheduling grant is a primary AG or a secondary AG; and

updating an SG with an AG value carried by the scheduling grant if the scheduling grant is a primary AG.

2. The method of claim 1 further comprising:

if the scheduling grant is not an AG, determining whether a scheduling mode is a primary AG mode; and

if the scheduling mode is not a primary AG mode, waiting for a next transmission time interval (TTI).

3. The method of claim 2 further comprising:

if the scheduling mode is a primary AG mode, updating the SG based on a received RG.

4. The method of claim 3 wherein the RG is interpreted relative to a power ratio in a previous transmission time interval (TTI) for the same hybrid automatic repeat request (H-ARQ) process.

5. The method of claim 4 wherein the RG indicates one of an UP command, a DOWN command and a HOLD command, whereby if the RG indicates an UP command, the SG is generated by increasing a previous SG by a predetermined step size, if the RG indicates a DOWN command, the SG is generated by decreasing the previous SG by the predetermined step size, and if the RG indicates a HOLD command, the previous SG remains unchanged.

6. The method of claim 1 further comprising:

if the scheduling grant is a primary AG, setting a scheduling mode to a primary AG mode.

7. The method of claim 1 further comprising:

determining whether an AG value of the scheduling grant is set to “

inactive”

, whereby the SG is set to the AG value in the scheduling grant if the AG value is not set to “

inactive.”

8. The method of claim 7 further comprising:

setting a scheduling mode to a secondary AG mode if the AG value is set to “

inactive.”

9. The method of claim 7 further comprising:

determining whether a transmission time interval (TTI) is 10 ms or 2 ms;

if the TTI is 10 ms, activating all H-ARQ processes and waiting for the next TTI.

10. The method of claim 9 further comprising:

if the TTI is 2 ms, determining whether an activation flag is set to “

single”

or “

all”

;

if the activation flag is set to “

single”

, activating a corresponding hybrid automatic repeat request (H-ARQ) process; and

if the activation flag is set to “

all”

, activating all H-ARQ processes.

11. The method of claim 7 further comprising:

if the AG value is set to “

inactive”

, determining whether it is a 2 ms transmission time interval (TTI) or a 10 ms TTI; and

if it is a 2 ms TTI, determining whether an activation flag is set to “

single”

or “

all”

; and

if the activation flag is set to “

single”

, deactivating a corresponding hybrid automatic repeat request (H-ARQ) process.

12. The method of claim 11 further comprising:

if either the activation flag is set to “

all”

or if it is 10 ms TTI, determining whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured; and

if the secondary E-RNTI is not configured, deactivating all H-ARQ processes.

13. The method of claim 12 further comprising:

if the secondary E-RNTI is configured, setting the SG value based on the latest received AG value;

activating all H-ARQ processes; and

setting a scheduling mode to a secondary AG mode.

14. The method of claim 12 further comprising:

if the secondary E-RNTI is configured, maintaining the current SG value;

activating all H-ARQ processes; and

setting a scheduling mode to a secondary AG mode.

15. The method of claim 6 further comprising:

if the scheduling grant is not a primary AG, determining whether the scheduling mode is a secondary AG mode; and

if the scheduling mode is a secondary AG mode, setting the SG to a AG value in the scheduling grant.

16. The method of claim 15 further comprising:

if the scheduling mode is not a secondary AG mode, saving an AG value in the scheduling grant.

17. The method of claim 8 wherein the serving RLS sends a secondary AG before switching the scheduling mode from a primary AG mode to a secondary AG mode.

18. The method of claim 17 further comprising:

the serving RLS determining whether an out-of-date secondary AG exists before switching the scheduling mode from the primary AG mode to the secondary AG mode; and

the serving RLS switching the scheduling mode only if there is no out-of-date secondary AG exists.

19. The method of claim 18 wherein the serving RLS determines the existence of the out-of-date secondary AG by implementing a time threshold.

20. The method of claim 19 wherein the time threshold is static.

21. The method of claim 19 wherein the time threshold is dynamically adjusted based on a predetermined factor.

22. The method of claim 21 wherein the predetermined factor includes at least one of a traffic condition change rate, an interference condition variation rate and vehicle speed.

23. The method of claim 7 further comprising:

if the AG value is set to “

INACTIVE”

, determining whether the activation flag is set to “

single”

or “

all”

;

if the activation flag is set to “

single”

, determining whether it is 2 ms TTI r 10 ms TTI; and

if it is 2 ms TTI, deactivating a corresponding hybrid automatic repeat request (H-ARQ) process.

24. The method of claim 23 further comprising:

if the activation flag is set to “

all”

, determining whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured;

if the secondary E-RNTI is not configured, determining whether it is 2 ms TTI or 10 ms TTI; and

if it is 2 ms TTI, deactivating all H-ARQ processes.

25. The method of claim 24 further comprising:

if the secondary E-RNTI is configured, setting the SG based on the latest received AG value;

activating all H-ARQ processes; and

setting a scheduling mode to a secondary AG mode.

26. The method of claim 24 further comprising:

if the secondary E-RNTI is configured, maintaining the current SG;

activating all H-ARQ processes; and

setting a scheduling mode to a secondary AG mode.

27. The method of claim 15 further comprising:

determining whether the AG value is set to “

INACTIVE”

, and determining whether the scheduling mode is secondary AG mode only if the AG value is not set to “

INACTIVE.”

28. In a wireless communication system which supports an enhanced uplink (EU) such that a wireless transmit/receive unit (WTRU) receives an absolute grant (AG) from a serving radio link set (RLS) via an enhanced dedicated channel (E-DCH) absolute grant channel (E-AGCH) and a relative grant (RG) from the serving RLS and a non-serving radio link (RL) via an E-DCH relative grant channel (E-RGCH), a WTRU for generating a serving grant (SG), the WTRU comprising:

a decoder for decoding a received scheduling grant which includes an AG and an RG; and

an SG processor configured to update an SG with an AG value carried by the received scheduling grant if the received scheduling grant is a primary AG.

29. The WTRU of claim 28 wherein the SG processor is configured to determine whether a scheduling mode is a primary AG mode if a received scheduling grant is not an AG, and wait for a next transmission time interval (TTI) if it is determined that the scheduling mode is not a primary AG mode.

30. The WTRU of claim 29 wherein the SG processor is configured to update the SG based on a received RG if the received scheduling mode is a primary AG mode.

31. The WTRU of claim 30 wherein the SG processor interprets an RG relative to a power ratio in a previous transmission time interval (TTI) for the same hybrid automatic repeat request (H-ARQ) process.

32. The WTRU of claim 31 wherein the RG indicates one of an UP command, a DOWN command and a HOLD command, whereby if the RG indicates an UP command, the SG processor generates the SG by increasing a previous SG by a predetermined step size, if the RG indicates a DOWN command, the SG processor generates the SG by decreasing the previous SG by the predetermined step size, and if the RG indicates a HOLD command, the SG processor maintains the previous SG.

33. The WTRU of claim 28 wherein the SG processor is configured to set a scheduling mode to a primary AG mode if the scheduling grant is a primary AG.

34. The WTRU of claim 28 wherein the SG processor is configured to determine whether an AG value of the scheduling grant is set to “

inactive”

, whereby the SG processor sets the SG to the AG value in the scheduling grant if the AG value is not set to “

inactive.”

35. The WTRU of claim 34 wherein the SG processor is configured to set a scheduling mode to a secondary AG mode if the AG value is set to “

inactive.”

36. The WTRU of claim 34 wherein the SG processor is configured to determine whether a transmission time interval (TTI) is 10 ms or 2 ms, and activate all H-ARQ processes and wait for the next TTI if the TTI is 10 ms.

37. The WTRU of claim 36 wherein the SG processor is configured to determine whether it is a 2 ms TTI or a 10 ms transmission time interval (TTI) if the AG value is set to “

inactive”

, determine whether an activation flag is set to “

single”

or “

all”

if the TTI is 2 ms, and activate a corresponding hybrid automatic repeat request (H-ARQ) process if the activation flag is set to “

single.”

38. The WTRU of claim 37 wherein the SG processor is configured to determine whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured if the activation flag is set to “

all”

or it is 10 ms TTI, and deactivate all H-ARQ processes if the secondary E-RNTI is not configured.

39. The WTRU of claim 38 wherein the SG processor is configured to set the SG based on the latest received AG value if the secondary E-RNTI is configured, activate all H-ARQ processes, and set the scheduling mode to a secondary AG mode.

40. The WTRU of claim 38 wherein the SG processor is configured to maintain a current SG if the secondary E-RNTI is configured, activate all H-ARQ processes, and set the scheduling mode to a secondary AG mode.

41. The WTRU of claim 28 wherein the SG processor is configured to determine whether a scheduling mode is a secondary AG mode if the scheduling grant is not a primary AG, and set the SG to an AG value in the scheduling grant if the scheduling mode is a secondary AG mode.

42. The WTRU of claim 41 wherein the SG processor is configured to save an AG value in the scheduling grant if the scheduling mode is not a secondary AG mode.

43. The WTRU of claim 34 wherein the SG processor is configured to determine whether the activation flag is set to “

single”

or “

all”

, if the AG value is set to “

INACTIVE”

;

if the activation flag is set to “

single”

, determine whether it is 2 ms TTI or 10 ms TTI; and

if it is 2 ms TTI, deactivate a corresponding hybrid automatic repeat request (H-ARQ) process.

44. The WTRU of claim 43 wherein the SG processor is configured to determine whether a secondary E-DCH radio network temporary identifier (E-RNTI) is configured if the activation flag is set to “

all”

, if the secondary E-RNTI is not configured, determine whether it is 2 ms TTI or 10 ms TTI, and if it is 2 ms TTI, deactivate all H-ARQ processes.

45. The WTRU of claim 44 wherein the SG processor is configured to set the SG based on the latest received AG value if the secondary E-RNTI is configured, activate all H-ARQ processes, and set a scheduling mode to a secondary AG mode.

46. The WTRU of claim 44 wherein the SG processor is configured to maintain the current SG if the secondary E-RNTI is configured, activate all H-ARQ processes, and set a scheduling mode to a secondary AG mode.

47. The WTRU of claim 41 wherein the SG processor is configured to determine whether the AG value is set to “

INACTIVE”

, and determine whether the scheduling mode is secondary AG mode only if the AG value is not set to “

INACTIVE.”

48. In a wireless communication system which supports an enhanced uplink (EU) such that a wireless transmit receive unit (WTRU) receives an absolute grant (AG) and a relative grant (RG) from a Node-B, a Node-B for supporting a serving grant (SG) processing in a WTRU, the Node-B comprising:

a rate request processor configured to receive and process a rate request from a WTRU; and

a Node-B scheduler configured to control resource scheduling by sending a primary AG and a secondary AG to a WTRU, the Node-B scheduler configured to control resource scheduling for only a particular WTRU in a primary AG mode and control resource scheduling for a group of WTRUs in a secondary AG mode, wherein the Node-B scheduler is configured to send a secondary AG before switching a scheduling mode from a primary AG mode to a secondary AG mode.

49. The Node-B of claim 48 wherein the Node-B scheduler is configured to determine whether an out-of-date secondary AG exists before switching the scheduling mode from the primary AG mode to the secondary AG mode and switch the scheduling mode only if there is no out-of-date secondary AG exists.

50. The Node-B of claim 49 wherein the Node-B scheduler is configured to determine the existence of the out-of-date secondary AG by implementing a time threshold.

51. The Node-B of claim 50 wherein the time threshold is static.

52. The Node-B of claim 50 wherein the time threshold is dynamically adjusted based on a predetermined factor.

53. The Node-B of claim 52 wherein the predetermined factor includes at least one of a traffic condition change rate, an interference condition variation rate and vehicle speed.