Wake-up signal transmission

1. A method, of a network node adapted to transmit a wake-up signal, for waking up one or more wireless communication receivers, wherein the wake-up signal has a wake-up signal bandwidth, and wherein each of the one or more wireless communication receivers is comprised in a wireless communication device and is associated with a wake-up radio adapted to wake up the wireless communication receiver in response to detecting the wake-up signal, the method comprising:

acquiring, for at least one of the wireless communication devices, an indication of a maximum frequency error of the wake-up radio associated with the wireless communication receiver comprised in the wireless communication device;

determining, based on the maximum frequency error, a non-data transmission bandwidth for exclusive use by the wake-up signal;

transmitting the wake-up signal over a wake-up signal transmission frequency interval having a wake-up signal transmission bandwidth, wherein the wake-up signal transmission bandwidth is less than, or equal to, the non-data transmission bandwidth; and

wherein the acquiring the indication of the maximum frequency error comprises receiving, from the at least one of the wireless communication devices, a message indicative of the maximum frequency error.

2. The method of claim 1 , further comprising transmitting, to the at least one of the wireless communication devices, a request for the message indicative of the maximum frequency error.

3. The method of claim 1 , wherein the determining the non-data transmission bandwidth comprises determining the non-data transmission bandwidth to be equal to, or larger than, the wake-up signal bandwidth plus four times the maximum frequency error.

4. The method of claim 1 , further comprising transmitting data concurrently with the wake-up signal if the non-data transmission bandwidth is smaller than a total transmission bandwidth applied by the network node.

5. The method of claim 1 , the method further comprising, when the wake-up signal bandwidth is smaller than the wake-up signal transmission bandwidth, expanding the wake-up signal to the wake-up signal transmission bandwidth before transmission.

6. The method of claim 1 :

wherein the wake-up signal transmission bandwidth is less than the non-data transmission bandwidth;

further comprising allocating guard bands precluding signal transmission on respective sides of the wake-up signal transmission frequency interval, each guard band having a bandwidth; and

wherein the bandwidths of the guard bands plus the wake-up signal transmission bandwidth equals the non-data transmission bandwidth.

7. The method of claim 1 :

wherein the acquiring the indication comprises acquiring a plurality of indications of respective maximum frequency errors of respective wake-up radios; and

wherein determining the non-data transmission bandwidth comprises selecting the largest one of the respective maximum frequency errors and determining the non-data transmission bandwidth based on the selected maximum frequency error.

8. The method of claim 1 , further comprising transmitting an information signal to the at least one wireless communication device, the information signal indicating the non-data transmission bandwidth.

9. A method, of a wireless communication device adapted to receive a wake-up signal from a network node, for waking up a wireless communication receiver comprised in the wireless communication device, wherein the wireless communication receiver is associated with a wake-up radio comprised in the wireless communication device and adapted to wake up the wireless communication receiver in response to detecting the wake-up signal, the method comprising:

transmitting, to the network node, a message indicative of a maximum frequency error of the wake-up radio, wherein the maximum frequency error is for determination by the network node of a non-data transmission bandwidth for exclusive use by the wake-up signal; and

receiving, from the network node, a request for the message indicative of the maximum frequency error, wherein the transmitting the message is performed in response thereto.

10. The method of claim 9 , further comprising:

receiving an information signal from the network node, the information signal indicating the non-data transmission bandwidth; and

adapting one or more wake-up radio parameters based on the non-data transmission bandwidth.

11. The method of claim 9 , further comprising receiving the wake-up signal in a wake-up signal transmission frequency interval having a wake-up signal transmission bandwidth; wherein the wake-up signal transmission bandwidth is less than, or equal to, the non-data transmission bandwidth.

12. An arrangement for a network node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers, wherein the wake-up signal has a wake-up signal bandwidth, and wherein each of the one or more wireless communication receivers is comprised in a wireless communication device and is associated with a wake-up radio adapted to wake up the wireless communication receiver in response to detecting the wake-up signal, the arrangement comprising:

processing circuitry;

memory containing instructions executable by the processing circuitry whereby the arrangement is operative to:

acquire, for at least one of the wireless communication devices, an indication of a maximum frequency error of the wake-up radio associated with the wireless communication receiver comprised in the wireless communication device;

determine, based on the maximum frequency error, a non-data transmission bandwidth for exclusive use by the wake-up signal; and

transmit the wake-up signal over a wake-up signal transmission frequency interval having a wake-up signal transmission bandwidth, wherein the wake-up signal transmission bandwidth is less than, or equal to, the non-data transmission bandwidth; and

acquire the indication of the maximum frequency error by receiving, from the at least one of the wireless communication devices, a message indicative of the maximum frequency error.

13. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to transmit, to the at least one of the wireless communication devices, a request for the message indicative of the maximum frequency error.

14. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to determine the non-data transmission bandwidth by determining the non-data transmission bandwidth to be equal to, or larger than, the wake-up signal bandwidth plus four times the maximum frequency error.

15. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to transmit data concurrently with the wake-up signal if the non-data transmission bandwidth is smaller than a total transmission bandwidth applied by the network node.

16. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to, when the wake-up signal bandwidth is smaller than the wake-up signal transmission bandwidth, expand the wake-up signal to the wake-up signal transmission bandwidth before transmission.

17. The arrangement of claim 12 :

wherein the wake-up signal transmission bandwidth is less than the non-data transmission bandwidth;

wherein the instructions are such that the arrangement is operative to allocate guard bands precluding signal transmission on respective sides of the wake-up signal transmission frequency interval, each guard band having a bandwidth; and

wherein the bandwidths of the guard bands plus the wake-up signal transmission bandwidth equals the non-data transmission bandwidth.

18. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to:

acquire a plurality of indications of respective maximum frequency errors of respective wake-up radios;

determine the non-data transmission bandwidth by selecting the largest one of the respective maximum frequency errors; and

determine of the non-data transmission bandwidth based on the selected maximum frequency error.

19. The arrangement of claim 12 , wherein the instructions are such that the arrangement is operative to transmit an information signal to the at least one wireless communication device, the information signal indicating the non-data transmission bandwidth.

20. An arrangement for a wireless communication device adapted to receive a wake-up signal from a network node for waking up a wireless communication receiver comprised in the wireless communication device, wherein the wireless communication receiver is associated with a wake-up radio comprised in the wireless communication device and adapted to wake up the wireless communication receiver in response to detecting the wake-up signal, the arrangement comprising:

processing circuitry;

memory containing instructions executable by the processing circuitry whereby the arrangement is operative to:

transmit, to the network node, a message indicative of a maximum frequency error of the wake-up radio, wherein the maximum frequency error is for determination by the network node of a non-data transmission bandwidth for exclusive use by the wake-up signal; and

receive, from the network node, a request for the message indicative of the maximum frequency error, and perform the transmission of the message in response thereto.

21. The arrangement of claim 20 , wherein the instructions are such that the arrangement is operative to:

receive an information signal from the network node, the information signal indicating the non-data transmission bandwidth; and

adapt one or more wake-up radio parameters based on the non-data transmission bandwidth.

22. The arrangement of claim 20 , wherein the instructions are such that the arrangement is operative to receive the wake-up signal in a wake-up signal transmission frequency interval having a wake-up signal transmission bandwidth, wherein the wake-up signal transmission bandwidth is less than, or equal to, the non-data transmission bandwidth.