Method and apparatus for processing padding buffer status reports
A method and system for processing buffer status reports (BSRs) 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. The steps of 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 larger than the size of the BSR plus its sub-header, triggering BSR are performed. Doing so allows the sub-header(s) to be inserted or included into the MAC PDU or transport block (TB) or other type of data unit.
1. A method of constructing a medium access control protocol data unit (MAC PDU) to include a buffer status report (BSR), the method comprising:
determining, in a processor, whether any padding bits are available in the MAC PDU;
if a number of padding bits is equal to or larger than a size of Short BSR plus its sub-header but smaller than a size of Long BSR plus its sub-header and if more than one Logical Channel Group (LCG) has buffered data, triggering the BSR; and
including the triggered BSR into the MAC PDU,
wherein the MAC PDU contains a Logical Channel ID (LCID) field and the triggered BSR,
wherein a format of the triggered BSR has 2 bits of Logical Channel Group ID (LCG ID) field and 6 bits of buffer size field, and
wherein a value of the LCID field for the triggered BSR is different from a value of the LCID field for the Short BSR.
2. The method of claim 1 , wherein the sub-header includes a specific field indicating that the BSR is included in the MAC PDU.
3. The method of claim 2 , wherein the value of the LCID field for the triggered BSR is used to indicate that the BSR is included in the MAC PDU.
4. The method of claim 3 , wherein the logical channel identification (LCID) field has 5 bits.
5. The method of claim 3 , 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.
6. A protocol entity of a mobile terminal comprising:
a checking unit that checks whether any padding bits are available in a medium access control protocol data unit (MAC PDU); and
a processing unit that cooperates with the checking unit to perform steps of:
triggering a Buffer Status Report (BSR), if a number of padding bits is equal to or larger than a size of Short BSR plus its sub-header but smaller than a size of Long BSR plus its sub-header and if more than one Logical Channel Group (LCG) has buffered data; and
including the triggered BSR into the MAC PDU,
wherein the MAC PDU contains a Logical Channel ID (LCID) field and the triggered BSR,
wherein a format of the triggered BSR has 2 bits of Logical Channel Group ID (LCG ID) field and 6 bits of buffer size field, and
wherein a value of the LCID field for the triggered BSR is different from a value of the LCID field for the Short BSR.
7. The protocol entity of claim 6 , wherein the sub-header includes a specific field indicating that the padding BSR is included in the MAC PDU.
8. The protocol entity of claim 7 , wherein value of the LCID field for the triggered BSR is used to indicate that the BSR is included in the MAC PDU.
9. The protocol entity of claim 8 , wherein the logical channel identification (LCID) field has 5 bits.
10. The protocol entity of claim 8 , 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.