Method for propagation delay control

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/36 (2006.01) H04B 7/26 (2006.01) H04L 7/00 (2006.01) H04L 7/04 (2006.01) H04L 12/56 (2006.01) H04L 25/14 (2006.01)

Patent

CA 2269704

A method for maintaining synchronization between a base transceiver station (BTS) (30) and an interworking function (IWF) (40) within a cellular communications network (45) is disclosed. The method utilizes a synchronization procedure between the IWF (40) and the BTS (30) that makes the IWF (40) aware of propagation delays (36) between the IWF (40) and BTS (30). The IWF (40) utilizes this information to adapt to the delays (30) such that the correct sequence is unpacked uplink when obtained from the base transceiver station (30). The IWF (40) also uses synchronization data to control transmissions from the IWF (40) to the BTS (30) such that frame numbers and timeslots (20) are received at the BTS (30) in the correct sequence.

L'invention concerne un procédé permettant de maintenir la synchronisation entre une station d'émission et de réception (BTS) (30) et une fonction d'interconnexion (IWF) (40) au sein d'un réseau de communication cellulaire (45). Ce procédé fait appel à une procédure de synchronisation entre l'IWF (40) et le BTS (30) permettant à l'IWF (40) de reconnaître les temps de propagation (30) entre l'IWF (40) et le BTS (30). L'IWF (40) utilise cette information pour s'adapter auxdits temps (36) de telle manière que la séquence correcte soit décondensée par liaison montante lors de sa réception par la station d'émission et de réception (30). L'IWF (40) utilise également une synchronisation des données pour commander les transmissions vers le BTS (30) de telle manière que le nombre de trames et les tranches de temps (20) soient reçus par le BTS (30) dans une séquence correcte.

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