Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-08-15
1992-12-15
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082551, 340505, 340516, H04L 1224
Patent
active
051721090
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of registering a unit in a network at least one part of which is constituted from an open channel.
2. Discussion of Background
A transmission network, such as a home-automation network, may comprise "open" channels, that is to say channels which are able to be picked up by units not belonging to this network. This is the case for example for high-frequency electromagnetic wave transmission networks.
In a home-automation network which may comprise such open channels it is important that the various units linked to this network (domestic electrical equipment, audio and video equipment, observation sensors . . . ) each have an identity or address within the single network. Moreover, the units connected to an open transmission channel risk interfering with units connected to a neighbouring open network.
SUMMARY OF THE INVENTION
The subject of the present invention is a method of registering units connected to a communication network at least one part of which is constituted by an open channel, this method having to enable simple and unambiguous identification of all the units connected to this network, and these alone, and to attribute to them a registration characteristic of this network and unique for each unit.
The method of the invention consists, in a network of the abovementioned type and comprising network supervision means able to attribute a network identity and possibly an individual identity to each unit of the network, at the time of bringing each unit connected to the open channel into service, in initializing the attributing procedure, in verifying during a specified period of time whether any other similar neighbouring network whatsoever is initiating such a procedure, in recommencing the initialization at the end of a period of time in the affirmative or, in the negative, in continuing the procedure by sending to the network a registration request standby signal, in sending an item of identity information to a requesting unit if this request reaches the supervision means before the expiration of another specified period of time, or in aborting the procedure in the contrary case.
According to one aspect of the method of the invention, the item of identity information comprises the identity of the network and the identity of the unit in question.
According to another aspect of the invention, on bringing a unit into service, the attributing procedure is initialized, either automatically on connecting this unit to the supply network, or manually on pressing a button provided on this unit or on its support, this initialization triggering a temporization during which this unit places itself in a mode for listening for the transmission of a registration request standby signal, the unit sending its registration request if the standby signal reaches it before the expiry of the temporization, else the procedure aborts and must be recommenced from the initialization.
According to yet another aspect of the invention, the unit sends its registration request twice in succession, with an interval of time chosen randomly for each network, and if the supervision means observe that this time period has not been respected, they cause the attributing procedure to abort so as to cause it to recommence subsequently.
According to yet another aspect of the invention, the items of identity information are specified with the aid of a pseudo-random generator from the unique identity of the site where the network is situated, preferably the postal address of the building in which the network is situated if a home-automation network is involved, and if relevant, more precise information such as the name of the owner or of the tenant of the site.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood on reading the detailed description of an embodiment, taken by way of non-limiting example and illustrated by the attached drawing, in which:
FIG. 1 is a very simplified diagram of two neighbouring h
REFERENCES:
patent: 3310741 (1967-03-01), Uitermark et al.
patent: 3662267 (1972-05-01), Reed
Saini Jasjit S.
Troian Pierre
Giust John
Laboratoire Europeen de Recherches Electroniques Avancees
Yusko Donald J.
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