Proximity detection
First Claim
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1. A first device capable of communicating with a second device according to a wireless communications protocol, the first device comprising:
- a transceiver; and
a controller configured to;
receive an instruction to not transmit during a first period of time to enable a channel quality measurement to be performed by the second device during the first period of time; and
disregard said instruction and cause the transceiver to transmit a first signal during at least a portion of the first period of time, the transmission power of the first signal being modulated according to a predefined pattern, such that the second device, on receiving the first signal, can form a measure of the proximity of the first device to the second device by analysing the power of the received first signal so as to detect the predefined pattern.
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Abstract
A method of estimating the proximity of a first device to a second device in a network causes the first device to perform a first measurement in a first period during which a control message broadcasted over the network instructs devices in the network to not transmit during the first period, wherein the second device disregards the control message and transmits a first signal during the first period which is measured by the first device during the first period, and forms a measure of the proximity of the first device to the second device in dependence on a strength of the first signal.
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Citations
10 Claims
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1. A first device capable of communicating with a second device according to a wireless communications protocol, the first device comprising:
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a transceiver; and a controller configured to; receive an instruction to not transmit during a first period of time to enable a channel quality measurement to be performed by the second device during the first period of time; and disregard said instruction and cause the transceiver to transmit a first signal during at least a portion of the first period of time, the transmission power of the first signal being modulated according to a predefined pattern, such that the second device, on receiving the first signal, can form a measure of the proximity of the first device to the second device by analysing the power of the received first signal so as to detect the predefined pattern. - View Dependent Claims (2, 3)
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4. A method of communicating between a first device and a second device according to a wireless communication protocol, the method comprising:
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at a first device, receiving an instruction to not transmit during a first period of time to enable a channel quality measurement to be performed by a second device during the first period of time; at the first device, disregarding said instruction and transmitting a first signal during at least a portion of the first period of time, the transmission power of the first signal being modulated according to a predefined pattern; and at the second device, receiving the first signal and forming a measure of proximity of the first device to the second device by analysing the power of the received first signal so as to detect the predefined pattern. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A non-transitory computer readable storage medium having stored thereon computer readable instructions that when executed cause at least one processor to:
at a first device, receiving an instruction to not transmit during a first period of time to enable a channel quality measurement to be performed by a second device during the first period of time; at the first device, disregarding said instruction and transmitting a first signal during at least a portion of the first period of time, the transmission power of the first signal being modulated according to a predefined pattern, such that the second device, on receiving the first signal, can form a measure of the proximity of the first device to the second device by analysing the power of the received first signal so as to detect the predefined pattern.
Specification