Apparatus and methods for constructing a data unit that includes a buffer status report

• US 20090285237A1
• Filed: 07/22/2009
• Published: 11/19/2009
• Est. Priority Date: 02/20/2008
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck
• Granted Patent: US 7,852,877 B2
• Time in Patent Office: Days
• US Class Current: 370/474
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• 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
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

An apparatus and method for constructing a data unit that includes a buffer status report (BSR) such that when BSR triggering is performed, the size(s) of the necessary sub-header(s) are also to be considered together in addition to the BSR size. There is a checking unit that checks whether any padding region is available in a MAC PDU that was constructed, a comparing unit that compares the number of padding bits with the size of a buffer status report (BSR) plus its sub-header, and a processing unit that cooperates with the checking unit and the comparing unit to trigger a buffer status report (BSR) procedure if the number of padding bits is larger than the size of the BSR plus its sub-header, including the BSR and its sub-header in the MAC PDU, and setting an LCID in the sub-header to indicate a BSR is included, the BSR having been triggered due to padding. Using such apparatus allows the sub-header(s) to be inserted (included) into the MAC PDU (or transport block (TB) or other data unit).

Claims

1. A method of constructing a data unit to include a buffer status report (BSR), the method comprising:

checking whether any padding region is available in a MAC PDU that was constructed;

comparing the number of padding bits with the size of the BSR plus its sub-header; and

if the number of padding bits is equal to or larger than the size of the BSR plus its sub-header, triggering the BSR,

wherein at least one of a short BSR, a Truncated BSR, and a Long BSR is selectively reported based on a comparison among the number of padding bits, a size of the short BSR plus its sub-header, a size of the long BSR plus its sub-header, and an existence of logical channel group (LCG).

2. The method of claim 1, wherein the long BSR is reported, if the number of padding bits is equal to or larger than the size of the long BSR plus it sub-header.

3. The method of claim 1, wherein the truncated BSR is reported, if the number of padding bits is equal to or larger than the size of the short BSR plus its sub-header but smaller than the size of the long BSR plus its sub-header and if more than one LCG has data available for a transmission.

4. The method of claim 3, wherein the truncated BSR of the LCG is reported with the highest priority logical channel with data available for the transmission.

5. The method of claim 1, wherein the short BSR is reported, if the number of padding bits is equal to or larger than the size of the short BSR plus its sub-header but smaller than the size of the long BSR plus its sub-header and if one LCG has data available for a transmission.

6. The method of claim 1, further comprising:

setting an LCID field in the sub-header to indicate the BSR is included.

7. The method of claim 6, wherein the LCID field contains either a first value for a short buffer status report, a second value for a long buffer status report and a third value for a truncated BSR.

8. The method of claim 1, wherein the MAC PDU includes a short BSR having the logical channel group (LCG) identification field of 2 bits and a buffer size of 6 bits.

9. The method of claim 6, wherein the logical channel identification (LCID) field has 5 bits.

10. The method of claim 6, wherein the LCID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC control element or padding for the DL-SCH and UL-SCH respectively.

11. A medium access control (MAC) entity of a mobile station comprising:

a checking unit that checks whether any padding region is available in a MAC PDU that was constructed;

a comparing unit that compares the number of padding bits with the size of a buffer status report (BSR) plus its sub-header; and

a processing unit that cooperates with the checking unit and the comparing unit to trigger a buffer status report (BSR) procedure if the number of padding bits is equal to or larger than the size of the BSR plus its sub-header,

wherein at least one of a short BSR, a Truncated BSR, and a Long BSR is selectively reported based on a comparison among the number of padding bits, a size of the short BSR plus its sub-header, a size of the long BSR plus its sub-header, and an existence of logical channel group (LCG).

12. The MAC entity of claim 11, wherein the long BSR is reported, if the number of padding bits is equal to or larger than the size of the long BSR plus it sub-header.

13. The MAC entity of claim 11, wherein the truncated BSR is reported, if the number of padding bits is equal to or larger than the size of the short BSR plus its sub-header but smaller than the size of the long BSR plus its sub-header and if more than one LCG has data available for a transmission.

14. The MAC entity of claim 13, wherein the truncated BSR of the LCG is reported with the highest priority logical channel with data available for the transmission.

15. The MAC entity of claim 11, wherein the short BSR is reported, if the number of padding bits is equal to or larger than the size of the short BSR plus its sub-header but smaller than the size of the long BSR plus its sub-header and if one LCG has data available for a transmission.

16. The MAC entity of claim 11, wherein an LCID field is set in the sub-header to indicate the BSR is included.

17. The MAC entity of claim 16, wherein the LCID field contains either a first value for a short buffer status report, a second value for a long buffer status report and a third value for a truncated BSR.

18. The MAC entity of claim 11, wherein the MAC PDU includes a short BSR having the logical channel group (LCG) identification field of 2 bits and a buffer size of 6 bits.

19. The MAC entity of claim 16, wherein the logical channel identification (LCID) field has 5 bits.

20. The MAC entity of claim 16, wherein the LCID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC control element or padding for the DL-SCH and UL-SCH respectively.