Apparatus, and associated method, for synchronizing operation of codecs operable pursuant to a communicaton session
OwnerAri Lakaniemi, Janne Parantainen +3inventors
InventorsAri Lakaniemi, Janne Parantainen, Shkumbin Hamiti, Timo Rantalainen, Heikki Einola
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Abstract
Apparatus, and an associated method, for facilitating synchronization of the operational codec modes of communication stations which communicate pursuant to a communication session. Signaling is provided to indicate allowed AMR (adaptive multi rate) codec modes to optimize speech connections in a GSM/EDGE radio access network (GERAN). RTP messages are defined, such as defining new message types or new field extensions in RTP messages to identify the codec modes.
Claims18
In a communication system in which coded data, coded at a sending station by a sending-station codec, is communicated to a receiving station, and decoded thereat by a receiving station codec, both the sending-station codec and the receiving station codec operable pursuant to an allowable set of codec-modes, an improvement of apparatus for facilitating codec-mode synchronization between the sending station and the receiving station, said apparatus comprising:
- a codec-mode detector coupled to receive indications of a codec-mode of the allowable set of codec-modes pursuant to which the sending-station codec is operated;
- a codec-mode message generator coupled to receive indications of the codec-mode detected by said codec-mode detector, said codec-mode message generator for generating a codec-mode update message at least when the codec-mode pursuant to which the sending-station codec is operated changes.
In a method for communicating coded data in a communication system, between a mobile station and a correspondent node by way of a RAN (radio access network), the mobile station and the correspondent node each having a codec for performing coding and decoding operations, both the codec of the mobile station and the codec of the correspondent node exhibiting AMR (adaptive multirate functionality), an improvement of a method for facilitating codec-mode synchronization by identifying an ACS (active codec-mode set), formed of at least a first codec mode pursuant to which the codec of the mobile station and the codec of the correspondent node are to be operable, said method comprising:
- selecting at the RAN which of the at least first codec mode are to form the ACS;
- and
- sending an RTCP (Tealtime Transport Control Protocol) message to the correspondent node containing indicia associated with the ACS selected during said operation of selecting.
In a method for communicating coded data in a communication system between a mobile station and a correspondent node by way of a RAN (radio access network), the mobile station and the correspondent node each having a codec for performing coding and decoding operations, both the codec of the mobile station and the codec of the correspondent node exhibiting AMR (adaptive multirate functionality), the coded data selectably communicated upon a channel-type formed of one of a full rate channel and a reduced-rate channel, an improvement of a method for facilitating codec-mode selection within an ACS (active codec-mode set), formed of at least a first codec mode, pursuant to which the codec of the mobile station and the codec of the correspondent node are to be operable upon change in the channel-type upon which the coded data is to be communicated, said method comprising:
- identifying in an RTP message indicia indicating which of the at least the first codec mode are permitted to be used subsequent to the change in channel-type upon which the coded data is to be communicated;
- and
- sending the RTP (Real time Transport Control Protocol) message in which the indicia is identified during said operation of identifying to the mobile station.
In a method for communicating in a communication system in which coded data, coded at a sending station by a sending-station codec, is communicated to a receiving station, and decoded thereat by a receiving station codec, both the sending-station codec and the receiving station codec operable pursuant to an allowable set of codec-modes, an improvement of a method for facilitating codec-mode synchronization between the sending station and the receiving station, said method comprising:
- detecting indications of a codec-mode of the allowable set of codec-modes pursuant to which the sending-station codec is operated;
- generating a codec-mode update message at least when the codec-mode pursuant to which the sending-station codec is operated changes.
Dependencies are inferred from the claim text.