Local radio communication system
First Claim
1. A local radiocommunication system, comprising:
- at least one central controller;
several bases connected to the controller and controlled by said controller; and
several terminals, each communicating with at least one of the bases according to a master/slave process where each base plays a role of master and each terminal plays a role of slave at least after setting up a radio link between said base and said terminal, the base communicating with the terminals according to the same time division multiple access local radiocommunication protocol, said protocol providing, for each base, successive time slots during which either an uplink information packet sent by a terminal to said base or a downlink information packet sent by said base to said terminal are transmitted, and said base being adapted to determine in advance and impose planned transmissions between said base and said terminal, said planned transmissions comprising planned transmissions of downlink information and planned slots of uplink information, where the terminal is authorized to transmit an uplink information packet to the base, and at least some of said bases are susceptible to reciprocal interference, preventing the reception by one of said bases of an uplink information packet when another of said bases is transmitting a downlink information packet, the different bases being adapted to transmit to the controller, in real time, at least chronological information relating to transmissions planned by said bases, the controller being adapted to determine whether there is a risk of interferences occurring between said planned transmissions, and to impose on the base a chronology of said planned transmissions which enables at least some of said interferences to be avoided.
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Accused Products
Abstract
The invention relates to a local radio communication system comprising a central controller (9), several bases (7) which are connected to the controller and several terminals (5) which communicate with the bases. The bases (7) communicate with the terminals using a local radio communication protocol with time division multiple access. Said bases are adapted to real-time transmit chronological information to the controller releasing to the transmissions planned for said bases. The controller is adapted to determine if there is a risk of interferences occurring between the planned transmissions and to impose a chronology for said planned transmissions on the bases in order to limit said interferences.
17 Citations
22 Claims
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1. A local radiocommunication system, comprising:
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at least one central controller; several bases connected to the controller and controlled by said controller; and several terminals, each communicating with at least one of the bases according to a master/slave process where each base plays a role of master and each terminal plays a role of slave at least after setting up a radio link between said base and said terminal, the base communicating with the terminals according to the same time division multiple access local radiocommunication protocol, said protocol providing, for each base, successive time slots during which either an uplink information packet sent by a terminal to said base or a downlink information packet sent by said base to said terminal are transmitted, and said base being adapted to determine in advance and impose planned transmissions between said base and said terminal, said planned transmissions comprising planned transmissions of downlink information and planned slots of uplink information, where the terminal is authorized to transmit an uplink information packet to the base, and at least some of said bases are susceptible to reciprocal interference, preventing the reception by one of said bases of an uplink information packet when another of said bases is transmitting a downlink information packet, the different bases being adapted to transmit to the controller, in real time, at least chronological information relating to transmissions planned by said bases, the controller being adapted to determine whether there is a risk of interferences occurring between said planned transmissions, and to impose on the base a chronology of said planned transmissions which enables at least some of said interferences to be avoided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A local radiocommunication system having several bases and several terminals, each terminal communicating with one of the bases according to a time division multiple access local radiocommunication protocol, said protocol providing, for each base, successive time slots during which either an uplink information packet sent by a terminal to said base, or a downlink information packet sent by said base to said terminal are transmitted, wherein at least some of said bases are susceptible to reciprocal interference and prevent the reception by one of said bases of an uplink information packet if another of said bases transmits a downstream information packet and, wherein the bases each comprise a network of antennas with controlled directivity and which are adapted to enable said network of antennas to adapt several configurations of antennas with different directivities, the local radiocommunications system comprising:
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means to instigate successively the transmission of test radio signals by each base in different antenna configurations; means to then measure the levels of radio signals received by the other bases; means to measure the quality of the communication between the base which transmitted the test radio signal and the terminals; and a central controller communicating with all the bases and controlling said bases, the central controller being adapted to determine, among the antenna configuration of each base used during the transmission of test radio signals, an antenna configuration adapted to minimize the level of radio signals received by the other bases during transmissions of said radio signals, while ensuring satisfactory quality of communication between the bases and all the terminals, said central controller being adapted to impose said configurations on the bases. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification