METHOD FOR TRANSMITTING PDCP STATUS REPORT

• US 20090238142A1
• Filed: 03/17/2009
• Published: 09/24/2009
• Est. Priority Date: 03/17/2008
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, CHUN, Sung-Duck
• Granted Patent: US 7,978,616 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• 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 80/02 Data link layer protocols

Abstract

A method of transmitting PDCP (Packet Data Convergence Protocol) status reports, is performed by a mobile terminal by receiving, from an upper layer, a request for PDCP (Packet Data Convergence Protocol) re-establishment; detecting whether there are any out-of-sequence PDCP SDUs (service data units) stored; and if there is at least one out-of-sequence PDCP SDU stored, allocating a bitmap field of length in bits equal to the number of PDCP SNs from and not including the first out-of-sequence PDCP SDU up to and including a last out-of-sequence PDCP SDU.

Claims

1. A method of transmitting PDCP (Packet Data Convergence Protocol) status reports, the method comprising:

receiving, from an upper layer, a request for PDCP (Packet Data Convergence Protocol) re-establishment;

detecting whether there are any out-of-sequence PDCP SDUs (service data units) stored; and

if there is at least one out-of-sequence PDCP SDU stored, allocating a bitmap field of length in bits equal to the number of PDCP sequence numbers (SNs) from and not including a first out-of-sequence PDCP SDU up to and including a last out-of-sequence PDCP SDU.

2. The method of claim 1, wherein if there is no out-of-sequence PDCP SDU stored, the step of allocating the bitmap field is not performed.

3. The method of claim 1, wherein the PDCP SDUs are stored in a buffer.

4. The method of claim 1, wherein the steps are performed for RLC (Radio Link Control) AM (Acknowledged Mode).

5. The method of claim 1, wherein the PDCP re-establishment occurs for HO (handover) situations.

6. The method of claim 1, wherein the PDCP status report includes an FMS (First Missing Sequence number) field.

7. The method of claim 6, wherein setting the FMS field to the PDCP SN of the first missing PDCP SDU.

8. The method of claim 1, wherein the bitmap field having a value of 1 indicates that a corresponding PDCP SDU was successfully received.

9. The method of claim 1, wherein the bitmap field having a value of 0 indicates that a corresponding PDCP SDU was unsuccessfully received.

10. The method of claim 7, wherein if a value of a particular bit in the bitmap field is 0, this means that a PDCP SDU having a sequence number that equals a position N of the particular bit plus a value of the FMS field was unsuccessfully received, wherein the position N is an integer starting from 1.

11. The method of claim 1, wherein if a value of a particular bit in the bitmap field is 1, this means that a PDCP SDU having a sequence number that equals a position N of the particular bit plus a value of the FMS field was successfully received, wherein the position N is an integer starting from 1.