Methods and system for fast session establishment between equipment using H.324 and related telecommunications protocols

• US 20060176877A1
• Filed: 03/10/2006
• Published: 08/10/2006
• Est. Priority Date: 12/12/2002
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Dilithium Networks
• Inventors: Jack, David, Wong, Albert, Myers, David, Jongbloed, Robert, Southeren, Craig, Jabri, Marwan A.
• Granted Patent: US 7,161,949 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/1106 Call signalling protocols; H.323 and related
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04M 2203/2066 Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP
• CPC Class Codes: H04M 2207/20 hybrid systems
• CPC Class Codes: H04M 3/563 User guidance or feature selection
• CPC Class Codes: H04M 3/567 Multimedia conference systems
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/126 Interworking of session control protocols

Abstract

Methods of establishing multimedia telecommunication (a multimedia “call”) between equipment (“terminals”). More particularly, the invention provides methods for reducing the time required to establish calls between terminals that implement the ITU-T H.324 Recommendation and other Standards and Recommendations derived from or related to this such as the 3G-324M recommendation developed and adopted by the Third Generation Partnership Projects (3GPP and 3GPP2). More specifically, it relates to (i) a method and apparatus for concatenating the H.245 messages that are required to pass between the terminals at the start of the call to establish the capabilities of both terminals and agree on the type and format of media and data to be exchanged (ii) a method and apparatus for using non-standard H.245 messages or standard H.245 messages with non-standard fields to accelerate such establishment and (iii) a method and apparatus of informing each terminal of the capabilities of the other and proposing the type and format of media and data to be exchanged by means of any user-defined fields that are inserted in the call signaling protocol that is used for bearer establishment prior to the start of the H.324 stage of the call.

Claims

1. A method of initiating a call between users with reduced call set-up times using one or more 3G telecommunication networks, the method being provided between at least a pair of H.324-like devices coupled to the one or more 3G telecommunication networks, the method comprising:

transmitting a call signaling message from a first device to a second device through a telecommunication network to initiate a call;

establishing a bearer channel between the first device and the second device once the call signaling message has been received by the second device;

determining a mobile level for operation;

performing two or more transmitting processes within a round trip cycle time using the first device, the transmitting process comprising;

transmitting a first SRP frame characterized by a first content from the first device to the second device through the bearer channel; and

transmitting a second SRP frame characterized by a second content from the first device to the second device through the bearer channel prior to receiving a first acknowledgment from the second device in response to the first SRP frame.

2. The method of claim 1 further comprising performing an additional transmitting process comprising transmitting a number of additional SRP frames from the first device to the second device through the bearer channel prior to receiving a second acknowledgement from the second device in response to at least one of the second SRP frame or the additional SRP frames.

3. The method of claim 2 wherein the number of additional SRP frames is a predetermined maximum number.

4. The method of claim 2 further comprising:

receiving the second acknowledgement from the second device; and

determining an association between at least one of the first SRP frame or the second SRP frame.

5. The method of claim 1 further comprising receiving the first acknowledgement from the second device using a sliding window.

6. The method of claim 5 further comprising receiving the first acknowledgement from the second device using a selective ACK scheme.

7. The method of claim 5 further comprising transmitting a third SRP frame characterized by a third content from the first device to the second device after receiving the first acknowledgment.

8. The method of claim 7 wherein the third frame is an nth frame that is transmitted n−

1 frames after the first frame.

9. The method of claim 1 further comprising retransmitting at least one of the first SRP frame or the second SRP frame from the first device to the second device after not receiving a corresponding SRP acknowledgment response in a predetermined time period.

10. The method of claim 9 wherein the predetermined time period is associated with a standard timer.

11. The method of claim 10 wherein the standard timer is a T401 timer.

12. The method of claim 1 further comprising:

receiving the first SRP frame at the second device; and

determining a capability associated with the first device based on receiving the first SRP frame.

13. The method of claim 12 wherein the capability comprises a TCS capability indication.

14. The method of claim 13 further comprising:

receiving the second SRP frame at the second device; and

determining a capability associated with the first device based on receiving the second SRP frame, wherein the TCS capability indication is segmented across the first frame and second frame.

15. The method of claim 12 wherein determining a capability comprises determining an alternative header is used in the first SRP frame.

16. The method of claim 1 further comprising repeating a transmission of the first SRP frame from the first device to the second device through the bearer channel, thereby improving reliability against channel errors.

17. The method of claim 1 further comprising:

receiving a message from the second device; and

determining a capability of the second device based in part on the received message.

18. The method of claim 1 wherein the first frame is associated with a first state machine and the second frame is associated with a second state machine different from the first state machine.

19. The method of claim 18 further comprising delaying transmission of an additional SRP frame until the first acknowledgment is received in response to the first frame, wherein the additional SRP frame is associated with the first state machine but characterized by different content than the first SRP frame.

20. The method of claim 1 further comprising delaying transmission of an additional SRP frame until the first acknowledgment is received in response to the first frame, wherein;

the first content is a first logical channel message associated with a first logical channel number,

the second content is a second logical channel message associated with a second logical channel number, and

the additional SRP frame characterized by a third content associated with the first logical channel number, wherein the third content is different from the first content.

21. The method of claim 1 further comprising using numbered SRP frames to identify a plurality of SDUs.