COMMUNICATION TERMINAL AND COMMUNICATION METHOD

• US 20160301777A1
• Filed: 06/20/2016
• Published: 10/13/2016
• Est. Priority Date: 11/10/2010
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: HORI, Takako, EHARA, Hiroyuki
• Granted Patent: US 10,645,198 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/12 Setup of transport tunnels
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices

Abstract

A communication terminal and method are provided, wherein a processor executes instructions to configure a codec mode or a codec mode set for a communication terminal. The configuration is based on Session Description Protocol (SDP) offer/answer messages between the communication terminal and a partner terminal in a codec negotiation session when communication starts between the communication terminal and the partner terminal, when the SDP offer/answer messages include a codec, and when a codec mode or a codec mode set is included. The processor also configures a Real-time Transport Protocol (RTP) payload format header based on the SDP offer/answer messages in the codec negotiation session, a CMR being a request for the partner terminal to change the codec mode. The processor further causes the transmitter to transmit, after the codec negotiation session, a codec mode of the communication terminal currently in use, using an RTP payload.

Claims

1. A communication terminal, comprising:

a processor, and

a transmitter,

wherein the processor executes instructions to

configure a codec mode or a codec mode set for the communication terminal, based on Session Description Protocol (SDP) offer/answer messages between the communication terminal and a partner terminal in a codec negotiation session when communication starts between the communication terminal and the partner terminal, when the SDP offer/answer messages include a codec, and when a codec mode or a codec mode set is included;

configure a Real-time Transport Protocol (RTP) payload format header, whether the header includes a codec mode request (CMR) field or not, based on the SDP offer/answer messages in the codec negotiation session, a CMR being a request for the partner terminal to change the codec mode; and

cause the transmitter to transmit, after the codec negotiation session, a codec mode of the communication terminal currently in use, using an RTP payload.

2. The communication terminal according to claim 1,

wherein, when the RTP payload format header is configured to include the CMR field in the codec negotiation session, the CMR field is transmitted by the RTP payload header.

3. The communication terminal according to claim 1,

wherein, when the RTP payload format header is configured not to include the CMR field in the codec negotiation session, the CMR field is not transmitted by the RTP payload header.

4. The communication terminal according to claim 1,

wherein the processor generates the CMR for requesting the partner terminal to change the codec mode when the codec mode or the codec mode set of the partner terminal needs to be changed.

5. The communication terminal according to claim 1,

wherein the codec mode includes a bit rate.

6. The communication terminal according to claim 1,

wherein the RTP payload includes a header portion and a data portion, and when the RTP payload format header is configured to include the CMR field in the codec negotiation session, the codec mode request is included in the header portion.

7. The communication terminal according to claim 6,

wherein when the RTP payload header format is configured to include the CMR field in the codec negotiation session, the CMR field is transmitted by the RTP payload header with or without data in the data portion.

8. The communication terminal according to claim 1,

wherein the RTP payload format header includes information indicating a bit rate of a basic part and an expanded part in a data portion, the data portion includes information indicating a combination of codecs of the basic part and the expanded part.

9. A communication method, comprising:

configuring a codec mode or a codec mode set, by a processor, for a communication terminal, based on Session Description Protocol (SDP) offer/answer messages between a communication terminal and a partner terminal in a codec negotiation session when communication starts between the communication terminal and the partner terminal, when the SDP offer/answer messages includes a codec, and when a codec mode or a codec mode set is included;

configuring a Real-time Transport Protocol (RTP) payload format header, by the processor, whether the header includes a codec mode request (CMR) field or not, based on the SDP offer/answer messages in the codec negotiation session, a CMR being a request for the partner terminal to change the codec mode; and

transmitting, by a transmitter, after the codec negotiation session, a codec mode of the communication terminal currently in use, using an RTP payload.

10. The communication method according to claim 9,

wherein, when the RTP payload format header is configured to include the CMR field in the codec negotiation session, the CMR field is transmitted by the RTP payload header.

11. The communication method according to claim 9,

wherein, when the RTP payload format header is configured not to include the CMR field in the codec negotiation session, the CMR field is not transmitted by the RTP payload header.

12. The communication method according to claim 9,

wherein the CMR for requesting the partner terminal to change the codec mode is generated when the codec mode or the codec mode set of the partner terminal needs to be changed.

13. The communication method according to claim 9,

wherein the codec mode includes a bit rate.

14. The communication method according to claim 9,

wherein the RTP payload consists of a header portion and a data portion, and when the RTP payload format header is configured to include the CMR field in the codec negotiation session, the codec mode request is included in the header portion.

15. The communication method according to claim 14,

wherein when the RTP payload header format is configured to include the CMR field in the codec negotiation session, the CMR field is transmitted by the RTP payload header with or without data in the data portion.

16. The communication method according to claim 9,

wherein the RTP payload format header includes information indicating a bit rate of a basic part and an expanded part in a data portion, the data portion includes information indicating a combination of codecs of the basic part and the expanded part.