Radio communication method and system

1 . A method of operating a radio communication system during a stand-by time interval in which the radio communication system is in a stand-by state comprising:

providing a reference clock signal having a reference clock period;

applying clock division processing to the reference clock signal producing a divided clock signal as a result;

applying phase-locked loop (PLL) processing to the divided clock signal producing a PLL clock signal as a result, wherein the PLL clock signal has a PLL clock period greater than the reference clock period;

receiving at least one input signal during a first part of the stand-by time interval;

in response to the at least one input signal having a first logic value, interrupting the applying PLL processing to the divided clock signal and enabling counting clock signal edges of the divided clock signal;

in response to the counting clock signal edges of the divided clock signal reaching a first target count value, and during a second part of the stand-by time interval, restarting the applying PLL processing to the divided clock signal;

continuing the counting clock signal edges of the divided clock signal until reaching a second target count value;

in response to the counting clock signal edges of the divided clock signal reaching the second target count value, and during a third part of the stand-by time interval, issuing an end-count signal and sampling the end-count signal based on the PLL clock signal producing a timing clock signal as a result; and

providing the timing clock signal to a user circuit.

2 . The method of claim 1 , wherein the user circuit comprises a timer circuit configured to measure a duration of the stand-by time interval.

3 . The method of claim 2 , wherein, during the second part of the stand-by time interval, the timing clock signal has a clock edge that is in a continuous phase relation with the clock edge of the PLL clock signal before interrupting the applying PLL processing to the divided clock signal.

4 . The method of claim 3 further comprising applying frequency division to the timing clock signal and providing a frequency divided timing clock signal to the user circuit as a result.

5 . The method of claim 2 further comprising applying frequency division to the timing clock signal and providing a frequency divided timing clock signal to the user circuit as a result.

6 . The method of claim 1 , wherein, during the second part of the stand-by time interval, the timing clock signal has a clock edge that is in a continuous phase relation with the clock edge of the PLL clock signal before interrupting the applying PLL processing to the divided clock signal.

7 . The method of claim 6 further comprising applying frequency division to the timing clock signal and providing a frequency divided timing clock signal to the user circuit as a result.

8 . The method of claim 1 further comprising applying frequency division to the timing clock signal and providing a frequency divided timing clock signal to the user circuit as a result.

9 . A radio communication system configured to be operated during a stand-by time interval in which the radio communication system is in a stand-by state, the radio communication system comprising:

a reference clock generator circuit block configured to provide a reference clock signal having a reference clock period;

a clock division processing circuit block configured to apply clock division processing to the reference clock signal, producing a divided clock signal as a result;

a phase-locked loop (PLL) circuit block configured to apply PLL processing to the divided clock signal, producing a PLL clock signal as a result, the PLL clock signal having a PLL clock period greater than the reference clock period;

a first input node configured to receive at least one input signal, during a first part of a stand-by time interval;

processing circuitry comprising a counter circuit, the processing circuitry configured to:

in response to the at least one input signal having a first logic value, asserting an interrupt signal and providing the interrupt signal to the PLL circuit block, thereby interrupting the applying PLL processing to the divided clock signal and enabling the counter circuit to count clock signal edges of the divided clock signal;

in response to the counter circuit reaching a first target count value, during a second part of the stand-by time interval, restart the applying PLL processing to the divided clock signal;

continue the counting, via the counter circuit, of the clock signal edges of the divided clock signal until reaching a second target count value,

in response to the counter circuit reaching the second target count value, during a third part of the stand-by time interval, issuing an end-count signal and sampling the end-count signal based on the PLL clock signal, producing a timing clock signal as a result, and

timing circuitry configured to provide the timing clock signal to a user circuit.

10 . The radio communication system of claim 9 , wherein the user circuit comprises a timer circuit configured to measure a duration of the stand-by time interval.

11 . The radio communication system of claim 10 , wherein, during the second part of the stand-by time interval, the timing clock signal has a clock edge that is in a continuous phase relation with the clock edge of the PLL clock signal generated before interrupting the applying PLL processing to the divided clock signal.

12 . The radio communication system of claim 11 , further comprising a set of frequency dividing circuit blocks configured to apply frequency division to the timing clock signal, providing a frequency divided timing clock signal to the user circuit as a result.

13 . The radio communication system of claim 10 , further comprising a set of frequency dividing circuit blocks configured to apply frequency division to the timing clock signal, providing a frequency divided timing clock signal to the user circuit as a result.

14 . The radio communication system of claim 10 further comprising an ultra-wide band radio communication system.

15 . The radio communication system of claim 9 , wherein, during the second part of the stand-by time interval, the timing clock signal has a clock edge that is in a continuous phase relation with the clock edge of the PLL clock signal generated before interrupting the applying PLL processing to the divided clock signal.

16 . The radio communication system of claim 15 , further comprising a set of frequency dividing circuit blocks configured to apply frequency division to the timing clock signal, providing a frequency divided timing clock signal to the user circuit as a result.

17 . The radio communication system of claim 15 further comprising an ultra-wide band radio communication system.

18 . The radio communication system of claim 9 , further comprising a set of frequency dividing circuit blocks configured to apply frequency division to the timing clock signal, providing a frequency divided timing clock signal to the user circuit as a result.

19 . The radio communication system of claim 18 further comprising an ultra-wide band radio communication system.

20 . The radio communication system of claim 9 further comprising an ultra-wide band radio communication system.