PROTOCOL AND METHOD OF VIA FIELD COMPRESSION IN SESSION INITIATION PROTOCOL SIGNALING FOR 3G WIRELESS NETWORKS

• US 20080069112A1
• Filed: 09/07/2006
• Published: 03/20/2008
• Est. Priority Date: 09/07/2006
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: SURI, Atul, Juneja, Anupam, Kharia, Yash
• Granted Patent: US 8,644,314 B2
• Time in Patent Office: Days
• US Class Current: 370/395.21
• 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
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

As SIP usage becomes prolific in 3G wireless communications, challenges are presented to using the current SIP protocols for real-time communications due to the limited signaling compression offered via SIP become. Signaling introduces unwanted delays on limited bandwidth and increases the call setup time. Additionally, SIP messages are large—from a few hundred bytes to several kilobytes—and compression is not offered on all available fields. The invention provides for compression of the VIA field of SIP messages through several techniques and thereby achieves lower signaling delays that reduce complex call setup delays and reduce the loss of bandwidth to necessary in-call signaling.

Claims

1. A system for compressing the VIA field in session initiation protocol (SIP) signaling messages, comprising:

a network device situated along a network path, the network device configured to process SIP signaling messages; and

a compression module configured to be executed by the network device, wherein the compression module receives an SIP signaling message and compresses the VIA field in the message during said processing of the SIP signaling message.

2. The system of claim 1, wherein the compression module is configured to compress the SIP signaling message by removing redundant information in the VIA field.

3. The system of claim 2, wherein the compression module is configured to include one or more parameters in the VIA field.

4. The system of claim 3, wherein a parameter identifies a portion of redundant information removed from the VIA field.

5. The system of claim 4, wherein a parameter identifies a hop in the path of the SIP message.

6. The system of claim 1, wherein the compression module is configured to compress the SIP signaling message by replacing information in the VIA field with a token.

7. The system of claim 6, wherein the compression module is configured to parse an SIP signaling message to identify the value of a token used in the VIA field.

8. The system of claim 6, wherein the compression module is configured to identify one or more repetitive strings in the VIA field and create a token for each of the one or more repetitive strings.

9. The system of claim 8, wherein protocol information is replaced with a token.

10. The system of claim 8, wherein user name information is replaced with a token.

11. The system of claim 8, wherein sub-domain information is replaced with a token.

12. The system of claim 8, wherein top level domain information is replaced with a token.

13. A method for compressing the VIA field in session initiation protocol (SIP) signaling messages, comprising:

receiving an SIP message;

identifying a domain associated with the sender of the SIP message;

comparing the identified domain with the current domain;

compressing the current domain when it is the same as the identified domain;

including the compressed current domain in a VIA field of the SIP message; and

sending the SIP message.

14. The method of claim 13, wherein the compressing step further comprises removing redundant information from the VIA field.

15. The method of claim 14, wherein the compressing step further comprises including a parameter indicating a hop in the path of the SIP message.

16. The method of claim 14, wherein the compressing step further comprises including a parameter identifying a portion of redundant information removed from the VIA field.

17. The method of claim 13, wherein the including step further comprises providing the compressed current domain in a new VIA field of the SIP message.

18. The method of claim 13, wherein the including step further comprises appending the compressed current domain to an existing VIA field of the SIP message.

19. A method for compressing the VIA field in session initiation protocol (SIP) signaling messages, comprising:

receiving an SIP message;

parsing a VIA field in the SIP message to identify one or more unique strings;

assigning a token to each of the one or more unique strings;

constructing a tokenized VIA field comprising one or more of the unique strings;

including the tokenized VIA field in the SIP message; and

sending the SIP message.

20. The method of claim 19, wherein the one or more unique strings comprises a protocol identifier.

21. The method of claim 19, wherein the one or more unique strings comprises a user name.

22. The method of claim 19, wherein the one or more unique strings comprises a sub-domain.

23. The method of claim 19, wherein the one or more unique strings comprises a top level domain.