Push-to-talk optimization

• US 8,195,212 B2
• Filed: 10/31/2005
• Issued: 06/05/2012
• Est. Priority Date: 11/02/2004
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Rockstar Bidco LP (Rockstar Consortium Inc.)
• Inventors: Akhtar, Haseeb, Jones, Anthony
• Primary Examiner(s): Kincaid, Lester
• Assistant Examiner(s): Woo, Kuo
• Application Number:
  US11/794,633
• Publication Number:
  US 20090274090A1
• Time in Patent Office: 2,409 Days
• Field of Search: 370/328, 370/521, 455/518, 455/556, 455/413, 455/519, 709/247, 709/204
• US Class Current: 455/518
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/4061 Push-to services, e.g. push-to-talk or push-to-video
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC

Abstract

A push to talk message protocol operating on a communication network between an originating and terminating communication device operates to transmit compressed message formats to initiate the push to talk message protocol. Four compressed session protocol message formats are used in the preferred embodiment. A compressed originating session initiation invite message is transmitted from the originating mobile station. A compressed terminating session initiation invite message is received by the terminating mobile station. A compressed session initiation protocol ping message is transmitted from the originating mobile station and received by the terminating mobile station. A compressed 200 OK session initiation protocol message is transmitted from the terminating mobile station and received by the originating mobile station. Finally, the originating mobile decompresses the 200 OK session initiation protocol message. These compressed messages are used to initiate the push to talk communication session.

Claims

1. A packet-based communication system comprising:

a first network element that receives a first compressed request message from an originating communication device to initiate a push-to-talk communication session between the originating communication device and a terminating communication device, said first compressed request message has a length of less than 30 bytes, and said first network element decompresses the first compressed request message to generate a first decompressed request message for transmission to a communication server;

said communication server supports a push-to-talk communication protocol and receives said first decompressed request message and processes said first decompressed request message to identify a group identifier for use in initiating a push-to-talk communication session, and said communication server generates a second decompressed request message based on said first decompressed request message for transmission to said first network element; and

said first network element receives said second decompressed request message from the communication server to transmit to a second network element that compresses the second decompressed request message to generate a second compressed request message to transmit to said terminating communication device for initiation of the push-to-talk communication session.

2. The packet-based communication system of claim 1, further comprising:

the second network element receiving a first compressed response message transmitted by the terminating communication device to initiate a push-to-talk communication session, said second network element decompressing said first compressed response message to generate a first decompressed response message.

3. The packet-based communication system of claim 2, further comprising:

said communication server receiving said first decompressed response message for routing to the first network element, said first network element compressing said first decompressed response message to generate a second compressed response message and transmitting said second compressed response message to the originating communication device to complete initiating a push-to-talk communication session.

4. The packet-based communication system of claim 1, further comprising:

the originating communication device acquiring a traffic channel connection to a radio router prior to generating and transmitting the first compressed request message to initiate a push-to-talk communication session, said traffic channel initiated upon a user accessing a contact list.

5. The packet-based communication system of claim 4, further comprising:

the terminating communication device acquiring a traffic channel connection to a radio router prior to receiving a request message to initiate the push-to-talk communication session.

6. The packet-based communication system of claim 5 wherein a compressed session initiation protocol ping message initiates acquiring the two traffic channels.

7. The packet-based communication system of claim 1, wherein the first compressed request message and the second compressed request message comprise a compressed session initiation protocol invite message.

8. The packet-based communication system of claim 3, wherein the first compressed response message and the second compressed response message comprise a compressed session initiation protocol 200 OK message.

9. A method for communicating in a push-to-talk communication protocol on a packet-based communication system, comprising the steps of:

receiving at a first network element a first compressed request message for initiating a push-to-talk communication session, said first compressed request message having a length of less than 30 bytes;

decompressing the first compressed request message to form a first decompressed request message;

transmitting said first decompressed request message to a communication server;

modifying said first decompressed request message at said communication server to form a second decompressed request message;

transmitting said second decompressed request message to a second network element;

compressing said second decompressed request message at the second network element to generate a second compressed request message having a length of less than 10 bytes; and

transmitting said second compressed request message to a terminating mobile station to initiate a push-to-talk communication session with an originating mobile station.

10. The method for communicating in a push-to-talk communication protocol on a packet-based communication system of claim 9, further comprising the steps of:

preparing a first compressed response message having a length of less than 20 bytes at the terminating communication device to transmit to the second network element;

transmitting the first compressed response message from the terminating mobile station;

decompressing said first compressed response message to use to generate a first decompressed response message;

compressing the first decompressed response message at the first network element to form a second compressed response message; and

transmitting said second compressed response message to the originating mobile station to initiate the push-to-talk communication session.

11. The method for communicating in a push-to-talk communication protocol on a packet-based communication system of claim 10, further comprising the steps of:

processing said first decompressed response message at the communication server for transmitting to the second network element;

receiving the first decompressed response message at the second network element from the communication server and transmitting to the first network element; and

compressing the first decompressed response message at the first network element to generate the second compressed response message.

12. The method for communicating in a push-to-talk communication protocol on a packet-based communication system of claim 9, wherein the first compressed request message and the second compressed request message comprise a compressed session initiation protocol invite message.

13. The method for communicating in a push-to-talk communication protocol on a packet-based communication system of claim 11, wherein the first compressed response message and the second compressed response message comprise a compressed session initiation protocol response message.

14. The method for communicating in a push-to-talk communication protocol on a packet-based communication system of claim 9, further comprising the steps of:

transmitting a first compressed session initiation protocol ping message to acquire a traffic channel connection to a radio router;

decompressing the first session initiation protocol ping message at the first network element to form a first decompressed session initiation protocol ping message;

compressing the first decompressed session initiation protocol ping message at the second network element to form a second compressed session initiation protocol ping message; and

transmitting the second compressed session initiation protocol ping message to the terminating mobile station to acquire a traffic channel connection between the terminating mobile station and a radio router.

15. A method for communicating on a packet-based communication system, comprising the steps of:

decompressing a first compressed request message at a first network element, said first compressed request message originating at a mobile station to initiate a push-to-talk communication session;

transmitting said first decompressed request message from the first network element to a communication server;

preparing a second decompressed request message at the communication server based on said first request message with additional parameters that include a group identifier that identifies participants in the push-to-talk communication session;

compressing said second decompressed request message to generate a second compressed request message; and

transmitting said second compressed request message to a terminating mobile station.

16. The method for communicating on a packet-based communication system of claim 15, further comprising the steps of:

transmitting a first compressed response message to initiate a push-to-talk communication session from said terminating mobile station to a second network element;

decompressing said first compressed response message to form a first decompressed response message;

compressing said first decompressed response message to form a second compressed response message; and

transmitting the second compressed response message to the originating mobile station to initiate a push-to-talk communication session.

17. The method for communicating on a packet-based communication system of claim 15, further comprising the step of:

acquiring a traffic channel between the originating mobile station and an originating radio router upon accessing a contact list and then transmitting a first compressed session initiation protocol ping message, said traffic channel acquired before transmitting said first compressed request message.

18. The method for communicating on a packet-based communication system of claim 17, further comprising the steps of:

decompressing said first compressed ping message at the first network element to form a first decompressed session initiation protocol ping message;

transmitting said first decompressed session initiation protocol ping message to the second network element; and

compressing the first decompressed session initiation protocol ping message to form a second compressed session initiation protocol ping message to transmit to the terminating mobile station to acquire a traffic channel between a terminating radio router and the terminating mobile station.

19. The method for communicating on a packet-based communication system of claim 15, wherein the first and second compressed request messages comprise a compressed session initiation protocol invite message.

20. The method for communicating on a packet-based communication system of claim 16, wherein the first and second compressed response message comprise a compressed session initiation protocol response message.