Method for Managing Access to a Shared Communication Medium
AssigneeSagem Defense Securite
InventorAlain Chiodini
Life of this patent
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Abstract
The methods for managing access to a communication medium shared by a plurality of radio communication devices. The method of accessing a radio communication medium shared between a plurality of communication terminals. The method is based on a variant of the CSMA/CD access protocol. The method is based on monitoring of the medium and the emission of a token to request permission to emit. The terminals that receive this token then emit an acknowledgement intended to signal that the medium can be used, or a collision message if they receive a plurality of tokens simultaneously. In the latter case, the emitter retries its attempt to use the medium later on.
Claims9
1-8. (canceled)
A method for accessing a radio communication medium shared between a plurality of communication terminals, wherein a communication terminal wishing to send data over said radio communication medium performs steps comprising:
- listening to the radio communication medium;
- and, if the radio communication medium is free:
- sending a token over the radio communication medium;
- receiving at least one response sent by at least one respective communication terminal that received the sent token;
- waiting and listening to the medium, when at least one received response is a collision message indicating that the communication terminal having sent the response has received several tokens;
- and
- sending the data, when each received response is an acknowledgement.
A terminal adapted to access a radio communication medium shared between a plurality of communication terminals, wherein, when said terminal wishes to send data over the radio communication medium, said terminal implements:
- means for listening to the radio communication medium;
- and if the radio communication medium is free:
- means for sending a token over the radio communication medium;
- means for receiving at least one response sent by at least one respective communication terminal that received the sent token;
- means for waiting and listening to the radio communication medium, when at least one received response is a collision message indicating that the communication terminal having sent the response has received several tokens;
- and
- means for sending the data, when each received response is an acknowledgement.
Dependencies are inferred from the claim text.