H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/32 (2006.01) H04B 1/40 (2006.01) H04Q 7/30 (2006.01) H04Q 7/38 (2006.01) G10L 19/00 (2006.01)
Patent
CA 2267270
The present invention relates to the technique of handover in mobile telephony. A new Transcoder and Rate Adaptation Unit (100, fig. 3) is introduced which provides two uplink (230, 250 respectively, fig. 3) and two downlink (240, 260 respectively, fig. 3) channels. The use of these two channels (230, 250 respectively, fig.3) on the uplink during handover provides for the use of distributed handover on the uplink. The result minimizes the audible interruption during handover by minimizing the loss of Traffic Channel frames to what is possible within the GSM standard. Additionally, interruption of the speech or background noise during these lost frames is masked by an error concealment algorithm, since the Transcoder and Rate Adaptation Unit (100, fig. 3) still has information from the Base Transceiver Station responsible for transmission before the handover.
L'invention concerne une technique de transfert dans le domaine de la téléphonie mobile. On utilise une nouvelle unité d'adaptation du débit et de transcodage (100, fig. 3) offrant deux voies montantes (230, 250, respectivement, fig. 3) et deux voies descendantes (240 et 260 respectivement, fig. 3). L'utilisation de ces deux voies (230, 250, fig. 3) sur la liaison montante pendant le transfert permet d'utiliser un transfert réparti sur cette dernière. Ainsi, on minimise l'interruption audible pendant le transfert en minimisant la perte de séquences de la voie de trafic autant que faire se peut dans le cadre de la norme GSM. De plus, l'interruption des signaux vocaux ou du bruit de fond au cours de ces séquences perdues est masqué par un algorithme de masquage des erreurs, car l'unité d'adaptation du débit et de transcodage (100, fig. 3) détient encore les informations provenant de la station d'émission et de réception responsable de la transmission avant le transfert.
Bodin Stig Roland
Galyas Peter
Linden Lars Kalle
Lindroth Lars Magnus
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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