Method and system for servicing full duplex call in push-to-talk over cellular

• US 20060172754A1
• Filed: 01/27/2006
• Published: 08/03/2006
• Est. Priority Date: 02/01/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shin, Dong-Cheol, Kim, Ju-Young, Jeon, Young-Ki
• Application Number:
  US11/340,585
• Publication Number:
  US 20060172754A1
• Time in Patent Office: Days
• US Class Current: 455/518
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/4061 Push-to services, e.g. push-to-talk or push-to-video
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

A method and system are provided for servicing a full duplex call in Push-To-Talk over cellular (PoC) in a communication system including at least two or more calling/called terminals for receiving a Push-To-Talk (PTT) service and a mobile network for providing the PTT service to the calling/called terminals. The calling terminal generates a full-duplex mode request message and transmits the full-duplex mode request message to the mobile network. The mobile network transmits the full-duplex mode request message to a PoC server that provides a PoC service to the calling terminal. Upon receiving the full-duplex mode request message, a PoC server of the calling terminal sets the calling terminal to a full duplex mode, and transmits the full-duplex mode request message to a PoC server of the called terminal. The PoC server of the called terminal transmits the full-duplex mode request message to the called terminal, and performs a call between the calling terminal and the called terminal in the full duplex mode if the called terminal responds to the full-duplex mode request message.

Claims

1. A system for servicing a full duplex call in Push-To-Talk over cellular (PoC) in a communication system comprising at least two terminals for receiving a Push-To-Talk (PTT) service and a mobile network for providing the PTT service to the terminals, the system comprising:

a terminal for generating a full-duplex mode request message, transmitting the full-duplex mode request message to the mobile network, and operating in a full duplex mode upon receiving a response to the full-duplex mode request message; and

a PoC server for setting the terminal to the full duplex mode and performing the PTT service in the full duplex mode;

wherein, when there is a PTT service request, the terminal generates a full-duplex mode request message, transmits the full-duplex mode request message to the mobile network, and operating in the full duplex mode upon receiving the response to the full-duplex mode request message,

and upon receiving the full-duplex mode request message from the terminal, the PoC server sets the terminal to the full duplex mode and performs the PTT service in the full duplex mode.

2. The system of claim 1, further comprising a Session Initiation Protocol (SIP)/Internet Protocol (IP) core interposed between the terminal and the PoC server, for converting the full-duplex mode request message transmitted by the terminal into an SIP/IP format.

3. The system of claim 1, further comprising a packet switched (PS) domain and an IP Multimedia Subsystem (IMS) core interposed between the mobile network connected to the terminal and the PTT server, for exchanging IP-based packet data with the terminal.

4. The system of claim 1, wherein the full-duplex mode request message is transmittable in response to an initial communication request.

5. The system of claim 4, wherein the full-duplex mode request message comprises a Session Description Protocol (SDP) a-line of a Talk Burst Control Protocol among information elements of an SIP set to:

a=poc-lock;

unlock.

6. The system of claim 1, wherein the full-duplex mode request message is transmittable during a PTT call.

7. The system of claim 6, wherein the full-duplex mode request message comprises a subtype field in a Real Time control Protocol (RTCP) message format set to:

11111.

8. A method for servicing a full duplex call in a Push-To-Talk over cellular (PoC) in a communication system comprising at least two calling/called terminals for receiving a Push-To-Talk (PTT) service and a mobile network for providing the PTT service to the calling/called terminals, the method comprising the steps of:

generating, by a calling terminal, a full-duplex mode request message and transmitting the full-duplex mode request message to a mobile network;

transmitting, by the mobile network, the full-duplex mode request message to a PoC server, the PoC server providing a PoC service to the calling terminal;

upon receiving the full-duplex mode request message, setting, by a PoC server of the calling terminal, the calling terminal to a full duplex mode;

transmitting, by the PoC server of the calling terminal, the full-duplex mode request message to a PoC server of the called terminal;

transmitting, by the PoC server of the called terminal, the full-duplex mode request message to the called terminal; and

performing a call between the calling terminal and the called terminal in the full duplex mode if the called terminal responds to the full-duplex mode request message.

9. The method of claim 8, wherein the fill-duplex mode request message, transmitted when the calling terminal desires to perform a call in the full duplex mode with the called terminal during initial communication, comprises a Session Description Protocol (SDP) a-line of a Talk Burst Control Protocol among information elements of an SIP set to:

a=poc-lock;

unlock.

10. The method of claim 8, further comprising the step of setting a subtype field in a Real Time control Protocol (RTCP) message format to 11111, when the calling terminal desires to perform a call in the full duplex mode during a PTT call.

11. The method of claim 8, further comprising the step of, upon receiving the full-duplex mode request message, sending, by a PoC server of the calling terminal, a request for an operation in the full duplex mode to the called terminal and performing a call between the calling terminal and the called terminal in the full duplex mode.