H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/22 (2006.01) H04Q 7/30 (2006.01)
Patent
CA 2205181
The present invention relates to a digital mobile communication system in which mobile stations (MS) and the fixed network comprise speech coders. The speech coders of the fixed network are located remote from the base stations (BTS) in transcoders (TRCU). In MMC calls, however, the transcoders are controlled to operate so that the frames received from a first base station (BTS) are forwarded with minor modifications through a pair of tandem connected transcoders to a second base station, without carrying out any speech encoding or decoding in the transcoders. Consequently, speech coding is only carried out in the mobile stations, and the speech parameters are simply passed through the mobile communication network, resulting in a significant improvement in the speech quality as compared with the conventional tandem coding.
L'invention concerne un système de communication mobile numérique dans lequel les stations mobiles (MS) et le réseau fixe comprennent des codeurs de signaux vocaux. Les codeurs de signaux vocaux du réseau fixe sont situés à distance des stations de base (BTS) dans des transcodeurs (TRCU). Cependant, dans les appels de dialogue homme-machine, les transcodeurs sont conçus pour fonctionner de sorte que les trames provenant d'une première station de base (BTS) soient envoyées avec des modifications mineures par l'intermédiaire d'une paire de transcodeurs connectés en tandem à une seconde station de base, sans codage ou décodage des signaux vocaux dans les transcodeurs. En conséquence, le codage des signaux vocaux s'effectue seulement dans les stations mobiles, et les paramètres vocaux sont transmis simplement dans le réseau de communication mobile, ce qui permet d'améliorer sensiblement la qualité vocale par rapport au codage en tandem classique.
Nokia Telecommunications Oy
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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