COMMUNICATION TERMINAL APPARATUS AND COMMUNICATION METHOD

摘要

A communication terminal apparatus is provided that includes a negotiator that negotiates a codec used for communication between the communication terminal apparatus and a counterpart terminal at a start of the communication. The negotiator uses an IP multimedia subsystem (IMS) signaling including one of a session description protocol (SDP) offer and an SDP answer. The negotiated codec supports bandwidths of input signals of a plurality of codecs, and changes a bandwidth of an input signal during the communication with the counterpart terminal by changing a frequency range of the input signal. The apparatus also includes a bandwidth determiner that limits the bandwidth and an encoding bit rate of the input signal of the codec during the communication with the counterpart terminal, according to signaling for limiting the bandwidth and the encoding bit rate of the input signal of the codec, the signaling being notified from a network node.

主权项

1. A communication terminal apparatus, comprising:
a negotiator that negotiates a codec used for communication between the communication terminal apparatus and a counterpart terminal at a start of the communication, using an IP multimedia subsystem (IMS) signaling including one of a session description protocol (SDP) offer and an SDP answer, the negotiated codec being a codec that supports bandwidths of input signals of a plurality of codecs, and that changes a bandwidth of an input signal during the communication with the counterpart terminal by changing a frequency range of the input signal; and a bandwidth determiner that limits the bandwidth and an encoding bit rate of the input signal of the codec during the communication with the counterpart terminal, according to signaling for limiting the bandwidth and the encoding bit rate of the input signal of the codec, the signaling being notified from a network node.