Transmitting and receiving method, especially for detecting an ID transmitter
First Claim
1. A method for transmitting and receiving signals between at least one first transmitting and receiving device and at least one further transmitting and receiving device, in particular for unlocking and/or locking a vehicle,a) monitoring with the first transmitting and receiving device, via a first communication path of a given frequency, for the presence of the second transmitting and receiving device,b) transmitting a request signal from the first transmitting and receiving device via the first communication path on detection of the second transmitting and receiving device,c) setting up a second communication path of a lower frequency than the frequency of the first communication path for a predetermined time interval between the first and the second transmitting and receiving devices as a function of the request signal, andd) measuring the reception power level in the second transmitting and receiving device by means of a measurement device.
2 Assignments
0 Petitions
Accused Products
Abstract
In a transmitting and receiving method, a request signal is transmitted between a first and an additional transmitting and receiving device by means of a bi-directional first communications path. According to the request signal, a second communications path is established for a predetermined time interval and the receiving power in the additional transmitting and receiving device is measured by means of a measuring device.
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Citations
12 Claims
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1. A method for transmitting and receiving signals between at least one first transmitting and receiving device and at least one further transmitting and receiving device, in particular for unlocking and/or locking a vehicle,
a) monitoring with the first transmitting and receiving device, via a first communication path of a given frequency, for the presence of the second transmitting and receiving device, b) transmitting a request signal from the first transmitting and receiving device via the first communication path on detection of the second transmitting and receiving device, c) setting up a second communication path of a lower frequency than the frequency of the first communication path for a predetermined time interval between the first and the second transmitting and receiving devices as a function of the request signal, and d) measuring the reception power level in the second transmitting and receiving device by means of a measurement device.
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12. A method for transmitting and receiving signals between a first transmitting and receiving device and a second transmitting and receiving device for unlocking and/or locking a lock, said method comprising:
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a) monitoring with the first transmitting and receiving device, via a first communication path, for the presence of the second transmitting and receiving device, b) transmitting a request signal from the first transmitting and receiving device via the first communication path upon detection of the second transmitting and receiving device, c) setting up a second communication path for a predetermined time interval between the first and the second transmitting and receiving devices as a function of the request signal, the start and duration of said predetermined time interval derived from information content of said request signal, and d) measuring the reception power level in the second transmitting and receiving device.
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Specification