Communications systems
First Claim
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1. A method of initiating data transfer between a source node and a destination node in a wireless communications system, the method comprising, in the source node:
- monitoring use of an initial communication channel, and if the initial communication channel is unused;
transmitting a request signal on the initial communication channel to the destination node, which request signal includes information identifying a source-preferred data communication channel;
scanning for an acknowledgement signal from the destination node on the initial communication channel, which acknowledgement signal includes information identifying a destination-preferred data communication channel; and
if an acknowledgement signal is received from the destination node;
defining a selected data communication channel on the basis of information included in the request and acknowledgement signals; and
initiating data transfer with the destination node on the selected data communication channel;
or if an acknowledgement signal is not received from the destination node, retransmitting the request signal after a randomly selected time period.
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Abstract
In a wireless communications network, communication between a source node and a destination node is initiated following detection of a free channel, using a request and acknowledgement exchange. If the exchange fails, a request retry is performed after a randomly determined time period.
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Citations
18 Claims
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1. A method of initiating data transfer between a source node and a destination node in a wireless communications system, the method comprising, in the source node:
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monitoring use of an initial communication channel, and if the initial communication channel is unused;
transmitting a request signal on the initial communication channel to the destination node, which request signal includes information identifying a source-preferred data communication channel;
scanning for an acknowledgement signal from the destination node on the initial communication channel, which acknowledgement signal includes information identifying a destination-preferred data communication channel; and
if an acknowledgement signal is received from the destination node;
defining a selected data communication channel on the basis of information included in the request and acknowledgement signals; and
initiating data transfer with the destination node on the selected data communication channel;
orif an acknowledgement signal is not received from the destination node, retransmitting the request signal after a randomly selected time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
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17. A method of initiating data transfer in a wireless communication system, the method comprising, in a node of the system:
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transmitting a request signal to a proposed destination node of the system;
scanning for an acknowledgement signal from the proposed destination node; and
if an acknowledgement signal is received from the proposed destination node, initiating data transfer with the destination node;
orif no acknowledgement signal is received from the proposed destination node, retransmitting the request signal after a time period determined by a counter.
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Specification