Wake-up signal transmission

1. A method of a wireless communication node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers, the method comprising:

determining a first set of data for concurrent transmission with the wake-up signal;

determining a first interference indicator value indicative of a level of interference caused by the first set of data to the wake-up signal due to concurrent transmission;

deciding if the wake-up signal is to be concurrently transmitted with the first set of data based on the first interference indicator value; and

transmitting the wake-up signal in accordance with the decision.

2. The method of claim 1 , wherein deciding if the wake-up signal is to be concurrently transmitted with the first set of data based on the interference indicator value comprises:

comparing the interference indicator value to a threshold; and

deciding that the wake-up signal is to be concurrently transmitted with the first set of data if the interference indicator value falls on a first side of the threshold.

3. The method of claim 1 , further comprising, if it is not decided that the wake-up signal is to be concurrently transmitted with the first set of data, determining a second set of data for concurrent transmission with the wake-up signal.

4. The method of claim 3 , further comprising:

determining a second interference indicator value indicative of a level of interference caused by the second set of data to the wake-up signal due to concurrent transmission; and

deciding if the wake-up signal is to be concurrently transmitted with the second set of data based on the second interference indicator value.

5. The method of claim 1 , wherein, if it is not decided that the wake-up signal is to be concurrently transmitted with any set of data, deciding that the wake-up signal is to be transmitted non-concurrently.

6. The method of claim 1 , wherein the level of interference caused by the first set of data to the wake-up signal due to concurrent transmission is dependent on one of more parameters associated with concurrent transmission, said one or more parameters comprising at least one of:

a modulation order of the first set of data,

a size of an inverse fast Fourier transform applied to the first set of data,

a number of sub-carriers used by the wake-up signal, and

a transmission power ratio between the wake-up signal and the first set of data.

7. The method of claim 1 , wherein the first interference indicator value is determined by calculating an error vector magnitude of concurrent transmission of the wake-up signal with the first data set.

8. The method of claim 1 , wherein the first interference indicator value is determined by:

performing table look-up based on one or more characteristics of concurrent transmission of the wake-up signal with the first data set to acquire score values corresponding to the one or more characteristics; and

accumulating the acquired score values.

9. A computer program product comprising a computer readable medium storing a computer program comprising program instructions, the computer program being executed by at least on processor to perform the method according to claim 1 .

10. An arrangement for a wireless communication node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers, the arrangement comprising a controller adapted to cause:

determination of a first set of data for concurrent transmission with the wake-up signal;

determination of a first interference indicator value indicative of a level of interference caused by the first set of data to the wake-up signal due to concurrent transmission;

decision of if the wake-up signal is to be concurrently transmitted with the first set of data based on the first interference indicator value; and

transmission of the wake-up signal in accordance with the decision.

11. The arrangement of claim 10 , wherein the controller is adapted to cause the decision of if the wake-up signal is to be concurrently transmitted with the first set of data based on the interference indicator value by causing:

comparison of the interference indicator value to a threshold; and

decision of that the wake-up signal is to be concurrently transmitted with the first set of data if the interference indicator value falls on a first side of the threshold.

12. The arrangement of claim 10 , wherein the controller is further adapted to cause, if it is not decided that the wake-up signal is to be concurrently transmitted with the first set of data, determination of a second set of data for concurrent transmission with the wake-up signal.

13. The arrangement of claim 12 , wherein the controller is further adapted to cause:

determination of a second interference indicator value indicative of a level of interference caused by the second set of data to the wake-up signal due to concurrent transmission; and

decision of if the wake-up signal is to be concurrently transmitted with the second set of data based on the second interference indicator value.

14. The arrangement of claim 10 , wherein the controller is further adapted to cause, if it is not decided that the wake-up signal is to be concurrently transmitted with any set of data, decision of that the wake-up signal is to be transmitted non-concurrently.

15. The arrangement of claim 10 , wherein the level of interference caused by the first set of data to the wake-up signal due to concurrent transmission is dependent on one of more parameters associated with concurrent transmission, said one or more parameters comprising at least one of:

a modulation order of the first set of data,

a size of an inverse fast Fourier transform applied to the first set of data,

a number of sub-carriers used by the wake-up signal, and

a transmission power ratio between the wake-up signal and the first set of data.

16. The arrangement of claim 10 , wherein the controller is further adapted to cause determination of the first interference indicator value by calculation of an error vector magnitude of concurrent transmission of the wake-up signal with the first data set.

17. The arrangement of claim 10 , wherein the controller is further adapted to cause determination of the first interference indicator value is by:

performance of table look-up based on one or more characteristics of concurrent transmission of the wake-up signal with the first data set to acquire score values corresponding to the one or more characteristics; and

accumulation of the acquired score values.

18. A wireless communication node comprising the arrangement according claim 10 .