H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/713 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2300067
Method and transmission system for the signalling of a carrier frequency The present invention provides a possible way of signalling digitally a carrier frequency which is used at a predetermined instant after the signalling. The invention can be used in particular in a so-called multiframe mode of a mobile part (2) of a digital transmission system, in a multiframe mode the mobile station (2) receiving data from a fixed station (1) only during so-called multiframe frames in order to be able to resynchronized with the fixed station (1) in an energy-saving manner. A multiframe frame is in this case provided after every (m-1) frames of the transmission. The carrier frequency (fx) used by the fixed station (1) in the next multiframe frame is in this case signalled to the mobile station (2) by means of the bits which correspond to bits of the header of the A field of the DECT standard. According to the invention, as a result of the initially effected signalling and synchronization of the carrier frequencies (fx) of the multiframe frames as the first step, it is then possible for the carrier frequency synchronization with regard to the frames between two successive multiframe frames to be carried out.
La présente invention offre la possibilité de signaler numériquement une fréquence porteuse qui est utilisée à un moment prédéterminé après la signalisation. L'invention est mise en oeuvre en particulier selon ce que l'on appelle un mode multitrame d'une partie mobile (2) d'un système de transmission numérique, mode selon lequel la station mobile (2) ne reçoit des données en provenance d'une station fixe (1) que pendant ce que l'on appelle des intervalles multitrames, pour pouvoir se synchroniser sur la station fixe (1) en économisant de l'énergie. Un intervalle multitrame est prévu après chaque (m-1) intervalle de la transmission. La fréquence porteuse (fx) utilisée dans l'intervalle multitrame suivant par la station fixe (1) est signalée à la station mobile (2) par les bits qui correspondent aux bits de l'en-tête du champ A de la norme DECT. Selon l'invention, à partir de la signalisation et de la synchronisation des fréquences porteuses (fx) des intervalles multitrames qui ont été effectuées une fois en tant que première étape, la synchronisation des fréquences porteuses, en ce qui concerne les intervalles, peut être effectuée entre deux intervalles multitrames successifs.
Kockmann Jurgen
Sydon Uwe
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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