System for the transmission of data to synchronised relay stations and corresponding process
First Claim
1. A data transmission system, comprising:
- relay stations (SHj, Sj−
i) that exchange messages therebetween by radio communication, each relay station provided with a network number (II) and including a clock (4) defining a local reference time, a module (3) transmitting/receiving messages on a frequency varying according to a selected time-division scheme defined relative to the local reference time, and a control module (5) forming the messages to be transmitted and processing the messages received, wherein the control module (5) of each relay station (SHj, Sj−
i) in a selected state forms synchronization messages, arranged to synchronize certain other relay stations to form at least part of a network and including its network number (II) and information relating to the selected state, wherein at least one of the relay stations (SH1) is identified as a “
master station”
, the control module (5) of the master remaining permanently in the selected state, and wherein each relay station (SHj, Sj−
i) includes a synchronization module (7) responsive to receipt of a synchronization message containing a network number corresponding to that of the station which hosts it, for extracting the status information therefrom in order to bring its relay station into the selected state.
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Accused Products
Abstract
Connected relay stations of a network each include a network number, a clock (4) defining a local reference time, a module (3) for transmitting/receiving messages on a frequency varying according to a selected time-division scheme defined relative to the local reference time, and a control module (5) for the messages. The control module of a synchronising relay station (SH) forms synchronisation messages including its network number, a common frequency, its time-division evolution scheme and a common reference time, for the transmission thereof. In addition, each relay station (SH) includes a synchronisation module (7) capable of extracting the information contained in a synchronisation message received bearing a common network number, in order, on the one hand, to readjust the local reference time defined by the clock (4) to the common reference time and, on the other hand, to provide the transmitting/receiving module (3) with the common frequency extracted and its time-division scheme, such that the relay station is frequency-synchronised with the synchronising station and in turn becomes a synchronising station.
40 Citations
31 Claims
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1. A data transmission system, comprising:
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relay stations (SHj, Sj−
i) that exchange messages therebetween by radio communication, each relay station provided with a network number (II) and includinga clock (4) defining a local reference time, a module (3) transmitting/receiving messages on a frequency varying according to a selected time-division scheme defined relative to the local reference time, and a control module (5) forming the messages to be transmitted and processing the messages received, wherein the control module (5) of each relay station (SHj, Sj−
i) in a selected state forms synchronization messages, arranged to synchronize certain other relay stations to form at least part of a network and including its network number (II) and information relating to the selected state,wherein at least one of the relay stations (SH1) is identified as a “
master station”
, the control module (5) of the master remaining permanently in the selected state, andwherein each relay station (SHj, Sj−
i) includes a synchronization module (7) responsive to receipt of a synchronization message containing a network number corresponding to that of the station which hosts it, for extracting the status information therefrom in order to bring its relay station into the selected state.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. Process for the transmission of data between relay stations that exchange messages therebetween by radio communication, each relay station having a network number and transmitting/receiving on frequencies varying according to a selected time-division scheme, the process including the following steps:
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1) assigning a local reference time to each station, 2) relating the time-division scheme of each station to its local reference time, 3) forming at one of the relay stations in a selected state, a synchronisation message arranged to synchronize certain other relay stations to form at least part of a network and including the station'"'"'s network number and information relating to a common frequency and representative of its time-division scheme, and of a common reference time, 4) then transmitting the synchronisation message via the one station in the direction of at least one recipient relay station, 5) extracting from the recipient station the information relating to the common frequency contained in the synchronisation message when the latter contains a network number corresponding to that of the recipient station, 6) adjusting the local reference time of the recipient station to the common reference time and applying the time-division scheme of the common frequency to the transmission/reception of the recipient station so as to bring the recipient station into the selected state, and 7) authorising the recipient station brought into the selected state to repeat said steps
3) and
4).
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Specification