Header compression enhancement for broadcast/multicast services

• US 7,822,067 B2
• Filed: 04/27/2004
• Issued: 10/26/2010
• Est. Priority Date: 08/08/2003
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wang, Jun, Jin, Haipeng, Hsu, Raymond Tah-Sheng, Veerepalli, Sivaramakrishna
• Primary Examiner(s): Cho; Hong
• Assistant Examiner(s): Choi; Eunsook
• Application Number:
  US10/833,547
• Publication Number:
  US 20050090273A1
• Time in Patent Office: 2,373 Days
• Field of Search: None
• US Class Current: 370/477
• CPC Class Codes: H04L 12/1877 Measures taken prior to transmission
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• 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 72/30 Resource management for broadcast services

Abstract

Methods and apparatus for compression of headers in broadcasting BCMCS services in a wireless communication system are described. Techniques used in BCMCS systems without feedback include sending static context information during BCMCS service initialization for use in a decompressor in a mobile station. Techniques used in BCMCS systems with feedback include receiving feedback from distributed mobile station decompressors and adjusting the broadcasting compressor in response to the feedback. Techniques that reduce the number of operating states in both the compressor and the decompressor are described. Techniques to classify flows so that a reduced number of contexts are used to compress/decompress session packet headers in a push-to-talk service are described.

Claims

1. A method of broadcasting over a broadcast communication channel in a wireless communication system, the method comprising:

sending context initialization information from a compressor over a signaling channel out-of-band to the broadcast communication channel that permits correct decompression of data packets over the broadcast communication channel; and

operating the compressor in First and Second Order States, the First Order State for sending data packets that include dynamic parameters of the compressor context and the Second Order State for sending data packets that include the dynamic parameters of the compressor context; and

;

changing operation of the compressor between the First Order State and the Second Order State.

2. A method as defined in claim 1, wherein changing operation of the compressor occurs at periodic intervals.

3. A method as defined in claim 1, wherein changing operation of the compressor is in response to feedback from the decompressor.

4. A method as defined in claim 3, wherein the feedback includes a request from the decompressor.

5. A method as defined in claim 1, wherein the context includes the static parameters.

6. A method as defined in claim 1, wherein the context initialization information is provided during service discovery.

7. A method as defined in claim 1, wherein the context initialization information is provided in response to a decompressor request.

8. A method as defined in claim 1, wherein changing operation of the compressor occurs following a predetermined number of broadcast data transmissions.

9. A method as defined in Claim 1, wherein when one of a quantity of sent data packets, period of time or wireless channel characteristic exceeds a threshold, then the compressor transitions from the Second Order State to the First Order State.

10. A method of broadcasting over a broadcast communication channel in a wireless communication system, the method comprising:

sending initialization context from a compressor over a signaling channel out-of-band to the broadcast communication channel, the initialization context including static parameters that permits correct decompression of data packets over the broadcast communication channel; and

operating the compressor thereafter in one of a plurality of states and sending data packets that include update parameters of the compressor context until termination of the broadcast operation.

11. A method as defined in claim 10, wherein the static parameters are available for reinitialization to the decompressor over one of a dedicated signaling channel or a broadcast signaling channel during the broadcast operation.

12. A method as defined in claim 10, wherein the update parameters are dynamic parameters.

13. A compressor, comprising:

a processor configured to start a broadcast session by generating an initialization context that includes dynamic and static parameters for use in a decompressor and providing the initialization context from the compressor to a signaling channel out-of-band to a broadcast channel for delivery to the decompressor, the processor further configured to operate in one of two conditions, the conditions comprising;

a First Order State that compresses data to be decompressed using the dynamic and static parameters; and

a Second Order State that reestablishes the dynamic parameters for use in the decompressor; and

wherein the compressor following generating the initialization context at a beginning of the broadcast session remains in either the First Order State or Second Order State for an entirety of the broadcast session.

14. A compressor as defined in claim 13, wherein the compressor alternates operation between the First Order and Second Order States.

15. A compressor as defined in claim 14, wherein the compressor alternates operation at periodic intervals.

16. A compressor as defined in claim 14, wherein the compressor alternates operation between the First Order and Second Order States following a predetermined number of data transmissions.

17. A compressor as defined in claim 14, wherein the compressor alternates operation between the First Order State and Second Order State in response to feedback.

18. A compressor as defined in claim 17, wherein the feedback includes a request to change States.

19. A compressor as defined in claim 13, further comprising re-initializing the context for use in a decompressor.

20. A compressor as defined in claim 19, wherein re-initializing the context is in response to a request.

21. A wireless communication infrastructure comprising a compressor configured to establish an initialization context that includes dynamic and static context parameters for use in a decompressor and to provide the initialization context from the compressor to a signaling channel out-of-band to a broadcast channel for deliver to the decompressor, the compressor further configured to alternate operation between a First Order State that compresses data to be decompressed using the dynamic and static parameters and a Second Order State that reestablishes the dynamic parameters for use in the decompressor;

wherein the compressor following establishing the initialization context remains in either the First Order or Second Order States for the entirety of a broadcast session.

22. A wireless communication infrastructure as defined in claim 21, wherein the compressor alternates operation between the First Order and Second Order States.

23. A wireless communication infrastructure as defined in claim 22, wherein the compressor alternates between the First Order and Second Order States in a predetermined manner.

24. A wireless communication infrastructure as defined in claim 22, wherein the compressor alternates between the First Order and Second Order States at periodic intervals.

25. A wireless communication infrastructure as defined in claim 22, wherein the compressor alternates operation between the First and Second States following a predetermined number of data transmissions.

26. A wireless communication infrastructure as defined in claim 22, wherein the compressor alternates between the First Order and Second Order States in response to feedback.

27. A wireless communication infrastructure as defined in claim 26, wherein the feedback includes a request to change States.

28. A wireless communication infrastructure as defined in claim 21, further comprising re-initializing the context for use in a decompressor.

29. A wireless communication infrastructure as defined in claim 28, wherein re-initializing the context is in response to a request.

30. A computer readable medium embodying program code when executed by a computer causes the computer to execute a method of header compressing, the method comprising:

establishing an initialization context from a compressor over a signaling channel out-of-band to a broadcast communication channel that includes dynamic and static parameters for use in a decompressor;

entering a First Order State that reestablishes dynamic and static parameters in a decompressor; and

entering a Second Order State that reestablishes dynamic parameters in the decompressor, wherein the compressor following establishing the initialization context at a beginning of a session alternates operation between the first and second states in a predetermined manner.

31. A wireless communication infrastructure, comprising:

means for sending context initialization information from a compressor over a signaling channel out-of-band to the broadcast communication channel that permits correct decompression of data packets over the broadcast communication channel; and

means for operating the compressor in First and Second Order States, the First Order State for sending data packets that include dynamic parameters of the compressor context and the Second Order State for sending data packets that include the dynamic parameters of the compressor context; and

;

means for changing operation of the compressor between the First Order State and the Second Order State.

32. A wireless communication infrastructure, comprising:

means for sending initialization context from a compressor over a signaling channel out-of-band to the broadcast communication channel, the initialization context including static parameters that permits correct decompression of data packets over the broadcast communication channel; and

means for operating the compressor thereafter in one of a plurality of states and sending data packets that include update parameters of the compressor context until termination of the broadcast operation.

33. A method of broadcasting over a broadcast communication channel in a wireless communication system, the method comprising:

sending decompressor context initialization information over a signaling channel out-of-band to the broadcast communication channel for decompression of data packets over the broadcast communication channel; and

operating the compressor between First and Second Order States for sending data packets that include dynamic parameters of the compressor context; and

;

changing operation of the compressor from the First Order State to the Second Order State when the compressor has confidence in proper context flow at a decompressor and changing operation of the compressor from the Second Order State to the First Order State when the compressor determines one of a quantity of sent data packets, period of time or wireless channel characteristic exceeds a threshold.