Signal message compression

• US 20070002780A1
• Filed: 10/14/2005
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Pessi, Pekka
• Granted Patent: US 7,882,263 B2
• Time in Patent Office: Days
• US Class Current: 370/261
• CPC Class Codes: H03M 7/3088 employing the use of a dictionary, e.g. LZ78
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC

Abstract

A method for compressing a signalling message in a communication system. The method comprising the steps of: receiving a part of the signalling message; detecting in a memory a copy of the part of the signalling message; comparing the length of the detected part against a stored length value; and dependent on the output of the comparison step performing a step of storing the detected part of the signalling message in the memory.

Claims

1. A method for compressing a signalling message in a communication system, the method comprising the steps of:

receiving a part of the signalling message;

detecting in a memory a copy of the part of the signalling message as a detected part;

comparing a length of the detected part against a stored length value and outputting an output result indicative thereof; and

dependent on the output result of the comparing step, storing the detected part of the signalling message in the memory.

2. A method as claimed in claim 1, further comprising:

performing the storing of the detected part only after the comparing step determines the stored length value is greater than the length of the detected part.

3. A method as claimed in claim 1, wherein the memory comprises a first memory part and a second memory part, the method further comprising the step of:

determining in which of the first memory part or the second memory part of the memory the copy of the part of the signalling message is detected.

4. A method as claimed in claim 3, wherein the stored length value is dependent on the step of determining in which of the first memory part or the second memory part of the memory the copy of the part of the signalling message is detected.

5. A method as claimed in claim 3, wherein the first memory part comprises a dictionary.

6. A method as claimed in claim 5, wherein the dictionary comprises at least one of:

a dynamic dictionary, and

a static dictionary.

7. A method as claimed in claim 3, wherein the stored length value is 4 bytes when the part of the signalling message is detected in the first memory part.

8. A method as claimed in claim 3, wherein the stored length value is 7 bytes when the part of the signalling message is detected in the second memory part.

9. A method as claimed in claim 1, wherein the memory comprises a ring buffer.

10. A communications device for compressing a signalling message in a communication system, comprising:

a memory;

a data detector arranged to detect in the memory a copy of a part of the signalling message and arranged to output a length of any detected part;

a length comparator arranged to compare the length of the detected part against a length value and provide an output result indicative thereof; and

a memory controller arranged to receive the output result from the length comparator, and to store the detected part of the signalling message to the memory based on the received output result.

11. A communications device as claimed in claim 10, wherein the memory comprises a first memory part and a second memory part.

12. A communications device as claimed in claim 10, further comprising:

a position reader arranged to detect a position of the detected part in the memory, and to output a length value to the length comparator dependent on the detected position.

13. A communications device as claimed in claim 12, wherein the position reader is arranged to output a first length value when the reader detects that the detected part is in a first part and a second length value when the reader detects that the detected part is in a second part.

14. A communications device as claimed in claim 11, wherein the first memory part comprises a dictionary.

15. A communications device as claimed in claim 14, wherein the dictionary comprises at least one of:

a dynamic dictionary, and

a static dictionary.

16. A communications device as claimed in claim 10, wherein the memory is a ring buffer.

17. A communications device as claimed in claim 16 wherein the ring buffer is in a virtual machine.

18. A communications device as claimed in claim 17, wherein the virtual machine is a universal compressor virtual machine.

19. A computer program embodied in a computer readable medium to implement a method for compressing a signalling message in a communication system, the method comprising the steps of:

receiving a part of the signalling message;

detecting in a memory a copy of the part of the signalling message as a detected part;

comparing a length of the detected part against a stored length value and outputting an output result indicative thereof; and

,

dependent on the output result of the comparing step, storing the detected part in the memory.