Terminal and codec mode selection method

摘要

A terminal is provided that determines the status of a communications and selecting an appropriate codec mode without applying a load to either a network or terminals, by using information held by the terminal as negotiation information. User Equipment (UE) sends to a partner the codec mode selected from a plurality of candidate codec modes notified by the partner, when communications commence. The UE includes a wireless receiver that receives a first information relating to the characteristics of a network to which the partner is currently connected; an information comparison unit that compares the first information and a second information relating to the characteristics of the network that the UE is currently connected to, and decides the communications format; and a mode determination unit that selects the codec mode to be used, from among the candidates and based on the decided communications format.

主权项

1. A communication terminal, comprising;
a mode changer that changes a codec mode or a codec mode set of the communication terminal or a partner terminal that is a communication destination, the communication terminal is configured by a signaling message for codec negotiation received from the partner terminal when communication starts between the communication terminal and the partner terminal, the signaling message for codec negotiation including a codec, and a codec mode or a codec mode set; and a transmitter that transmits, during communication with the partner terminal, a codec mode of the communication terminal currently in use, using an RTP (Real-time Transport Protocol) payload, wherein the transmitter transmits a codec mode request (CMR) for requesting the partner terminal to change the codec mode of the partner terminal using the RTP payload, the RTP payload includes a codec mode request field that is only present when the codec mode or the codec mode set of the partner terminal needs to be changed.