Method and apparatus for implementing LTE RLC header formats

• US 8,873,471 B2
• Filed: 09/30/2008
• Issued: 10/28/2014
• Est. Priority Date: 10/01/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ho, Sai Yiu Duncan
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): Beyen, Zewdu A
• Application Number:
  US12/241,416
• Publication Number:
  US 20090086710A1
• Time in Patent Office: 2,219 Days
• Field of Search: None
• US Class Current: 370/329
• 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

Systems and methodologies of reducing overhead by designating various fields in an optimized Radio Link Control header. Depending on communication type (e.g., VoIP, non-VoIP) such fields include a combination of a Segment Indicator (SI—which indicates presence of a whole SDU at beginning or at an ending), a Sequence Number (SN), a Length Indicator (LI—which indicates length of a service data unit); a length for the length indicator (LLI—to enable a variable size for the LI and notify a receiver regarding such varying size); a Segment Offset (SO—to designate resegmented packets for lost protocol data units); a length indicator for the SO (LSO—to enable a variable size for the SO); and Last Segment Flag (LSF—for resegmentation of RLC protocol data units).

Claims

1. A method for optimizing Radio Link Control (RLC) headers comprising:

implementing, by one or more processors, a segment offset (SO) field in a RLC header to designate resegmented packets for lost protocol data units;

implementing, by the one or more processors, a length indicator (LSO) for the SO field in the RLC header, to further accommodate a variable size of the SO field in the RLC header; and

implementing, by the one or more processors, a Last Segment Flag (LSF) in the RLC header to identify a last segment of a protocol data unit (PDU).

2. The method of claim 1 further comprising implementing, by the one or more processors, a two bit Segment Indicator (SI) field as part of the RLC header to indicate presence of a whole Service Data Unit (SDU) at beginning or at an ending of a transmittal for VoIP packets.

3. The method of claim 2 further comprising examining, by the one or more computer processors, the SI to verify segmentations.

4. The method of claim 1 further comprising implementing, by the one or more processors, a four bit Sequence Number (SN) as part of the RLC header for VoIP packets.

5. The method of claim 1, further comprising:

implementing, by the one or more processors, a length indicator (LI) to indicate length of a service data unit (SDU); and

implementing, by the one or more processors, a length of the length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.

6. A wireless communications apparatus, comprising:

at least one processor configured to;

implement a segment offset (SO) field in a RLC header to designate resegmented packets for lost protocol data units (PDUs);

implement a length indicator (LSO) for the SO field in the RLC header, to further accommodate a variable size thereof-of the SO field in the RLC header; and

implement a Last Segment Flag (LSF) in the RLC header to identify a last segment of a PDU.

7. The wireless communications apparatus of claim 6, the RLC header further comprising a two bit Segment Indicator (SI) field to indicate presence of a whole Service Data Unit (SDU)at beginning or at an ending of a transmittal for VoIP packets.

8. The wireless communications apparatus of claim 6, the RLC header further comprising a four bit Sequence Number (SN) for VoIP packets.

9. The wireless communications apparatus of claim 6, the RLC header further comprising:

a length indicator (LI) to indicate length of a service data unit (SDU); and

a length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.

10. A wireless communication apparatus for optimizing RLC headers comprising:

designating means for designating resegmented data packets for lost protocol data units in a RLC header;

means for accommodating a variable size for the designating means; and

means for identifying a last segment for last segment of a Protocol Data Unit (PDU) in the RLC header.

11. The wireless communication apparatus of claim 10 the RLC header further comprising a two bit Segment Indicator (SI) field to indicate presence of a whole Service Data Unit (SDU)at beginning or at an ending of a transmittal for VoIP packets.

12. The wireless communication apparatus of claim 10 the RLC header further comprising a four bit Sequence Number (SN) for VoIP packets.

13. The wireless communication apparatus of claim 10, the RLC header further comprising:

a length indicator (LI) to indicate length of a service data unit (SDU); and

a length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.

14. A computer program product comprising

a non-transitory computer-readable medium having stored thereon code for optimizing Radio Link Control (RLC) headers, the code comprising:

code for causing at least one computer to implement a segment offset (SO) field in a RLC header and further designate resegmented packets for lost protocol data units;

code for causing the at least one computer to implement a length indicator (LSO) for the SO field in the RLC header, to further accommodate a variable size of the SO field in the RLC header; and

code for causing the at least one computer to implement a Last Segment Flag (LSF) in the RLC header and identify a last segment of a Protocol Data Unit (PDU).

15. The computer program product of claim 14, the RLC header further comprising a two bit Segment Indicator (SI) field to indicate presence of a whole Service Data Unit (SDU) at beginning or at an ending of a transmittal for VoIP packets.

16. The computer program product of claim 14, the RLC header further comprising a four bit Sequence Number (SN) for VoIP packets.

17. The computer program product of claim 14, the RLC header further comprising:

a length indicator (LI) to indicate length of a service data unit (SDU); and

a length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.

18. A method of receiving a Radio Link Control (RLC) transmission comprising:

receiving an RLC header having a segment offset (SO) field that designates resegmented packets for lost protocol data units;

further receiving a length indicator (LSO) for the SO field in the RLC header, to further accommodate a variable size of the SO field in the RLC header; and

identifying a last segment of a Protocol Data Unit (PDU) via a Last Segment Flag (LSF) in the RLC header.

19. The method of claim 18 further comprising receiving a two bit Segment Indicator (SI) field as part of the RLC header to indicate presence of a whole Service Data Unit (SDU) at beginning or at an ending of a transmittal for VoIP packets.

20. The method of claim 18 further comprising receiving four bit Sequence Number (SN) as part of the RLC header for VoIP packets.

21. The method of claim 18 further comprising verifying whether a last bit is an end of a Service Data Unit (SDU).

22. The method of claim 18 further comprising receiving a PDU having a partial Service Data Unit (SDU).

23. The method of claim 18, further comprising:

receiving a length indicator (LI) to indicate length of a service data unit (SDU); and

receiving a length of the length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.

24. A wireless communications apparatus for receiving a Radio Link Control (RLC) header, comprising:

at least one processor configured to

receive the RLC header having a segment offset (SO) field that designates resegmented packets for lost protocol data units;

further receive a length indicator (LSO) for the SO field in the RLC header, to further accommodate a variable size of the SO field in the RLC header; and

identify a last segment of a Protocol Data Unit (PDU) via a Last Segment Flag (LSF) in the RLC header.

25. The wireless communication apparatus of claim 24, the at least one processor further configured to receive four bit Sequence Number (SN) as part of the RLC header for VoIP packets.

26. The wireless communications apparatus of claim 24, the at least one processor further configured to:

receive a length indicator (LI) to indicate length of a service data unit (SDU); and

receive a length indicator (LLI) for the LI in the RLC header, to further accommodate a variable size of the LI.