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Packet mode telecommunications method and system in which calls can be handed over from one path to another
| Details |
Inventors: Calot, Guillaume; Denis, Xavier; Farineau, Jean; Duros, Bertrand; Bousquet, Jacques; Sehier, Philippe; Al-Abedeen, Tarif Zein; Peligry, Yves;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Bost; Dwayne
Assistant Examiner: Gelin; Jean A
Attorney, Agent or Firm: Sughrue Mion, PLLC
The invention concerns a method of transmitting non-dated digital data between a transmitter and a receiver in which the data can take at least two different paths between the transmitter and the receiver and handover from one path to another occurs during transmission. In the transmitter, packets intended for the second path are transmitted only after the last packet intended for the first path has been transmitted and in the transmitter and in the receiver packets on the first or second path are delayed in order for packets on the second path to arrive after packets on the first path. It is therefore not necessary to transmit signaling to differentiate the two paths at the receiver, which can include a single demodulator. |
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DETAILED DESCRIPTION The invention addresses those drawbacks.
In the transmitter cells or packets intended for the second path are transmitted only after the last cell or packet intended for the first path has been transmitted, and in the transmitter and/or in the receiver cells or packets on the first or second path are delayed so that cells or packets on the second path arrive after cells or packets on the first path.
It is therefore unnecessary to transmit signaling for the last cell on the first path.
Also, the cells or packets on the second path arrive after those on the first path, and it is therefore unnecessary to provide two demodulators.
A single demodulator is sufficient.
In an embodiment of the invention, the transmission times on the first and second paths are made equal.
To this end, buffers in the transmitter and/or the receiver delay the cells or packets for long enough to obtain equal transmission times, for example.
The buffers are the same as those used to construct queues, for example.
They can equally well be separate from those queue memories.
The invention concerns not only a telecommunications method and system but also a transmitter and a receiver for implementing the method.
The transmitter includes two buffers, one for each path, and it includes means for preventing transmission of data at the output of the second buffer and said means are inhibited after transmission of the last cell or packet on the first path.
In one embodiment of the invention, transmitting the last cell or packet on the first path unblocks transmission of cells or packets from the second buffer.
Alternatively, the transmission of cells or packets from the second buffer is blocked for a particular time period following the handover command sufficient for the first buffer allocated to the first path to be emptied by transmitting all the cells or packets on the first path.
A receiver in accordance with the invention includes only one demodulator.
The method, the transmitter, and the receiver of the invention can be applied equally well to handing over a single connection or a plurality of connections
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