Thales

Jean-Claude Thill

Catherine Lamy-Bergot

Laurent Fachau

Gilles Monzat De Saint Julien

Raphael Massin

Fabien Verhaeghe

Isabelle Herbin

Marc Bieth

Fabien Verharghe

A system and method for communication resource allocation, a resource including a time slot and at least one associated channel, said channel including at least one transmit and/or receive frequency usable during said time slot, in a mobile meshed network including a first set of radio transceivers communicating with one another via radio links, at least one group, comprising a second set of at least one radio transceiver of said first set, said second set including a master transceiver in a master/subordinate relationship with all the radio transceivers of the second set, a central radio transceiver of the network belonging to said first set. Said system is characterized in that it comprises first means for determining said group(s), second means for allocating all or some of said resources through assignment of a resource to a single group which is able to use said resource for one or more communications between radio transceivers of said group; or through allocation of a resource to a single first group which is able to use said resource for communication between radio transceivers of said first group and radio transceivers belonging to one or more neighboring destination groups, if none of the other resources sharing the same time slot with said resource is determined as belonging to one of said destination groups or to a different second group for links to one of said destination groups of the first group, except if the first group and the second group have no transceiver having a common radio neighbor in the destination groups. Finally, said system comprises third means for allocating, for all or some of the groups, all or some of the resources allocated to said group, to one of the radio transceivers in the group.

System and method for communication resource allocation

A distributed method for dynamically assigning time-frequency resources in a network comprising several stations is disclosed. The stations are organized in groups (or interfaces) of several stations with each group comprising an allocation table Tsi. Each group exchanges this allocation table by means of a signaling protocol with groups that are defined as being in conflict with it by a constraints graph. The method uses an arbitration function to settle the conflicts and the assignments of allocations between the groups in conflict according to the constraints graph. In performing the method, each interface Ji transmits the allocation table TJi associated with it to the interfaces K indicated as being in conflict in the constraints graph. An interface Ji looks, for each allocation AJi that it has entered in its table TJi, whether the allocation AJi is used in the table received from an interface K that is in conflict. The interface Ji uses the arbitration function to modify the allocation AJi in the table TJi.

Method for dynamically allocating resources in a network of station clusters

A distributed synchronization method in a communication network is disclosed. A number of stations exchange messages between themselves. A synchronization pattern characteristic of the clock reference of the sender is inserted into each message transmitted by a sender. The clock reference of each station is updated with the clock reference that it receives from another station of the network if, and only if, the received time is leading the clock reference. The update is done by calculating the difference &#x394;X=T'a&#x2212;Ta between the time of sending T&#x2032;a of the message received by a station A and the time of reception Ta of the same message by the station B, and applying a correction 0&#x3c;&#x394;Y&#x3c;=&#x394;X if the received time of sending is leading by a quantity of at least &#x3c4; (&#x394;X&#x3e;&#x3c4;&#x3e;0).

Distributed synchronization method and system

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Fontenay aux Roses, France

Jean-Claude Thill