Wake-up signal with reconfigurable sequence design

1. A method, comprising:

communicating, between a base station and a terminal including a receiver, a control message indicative of a limited capability of the receiver reduced to supporting a set of candidate sequence designs when operated in a low power mode;

determining a sequence design of a wake-up signal based on the limited capability of the receiver when operated in the low power mode;

communicating, between the base station and the terminal, a downlink control message indicative of a sequence design of the wake-up signal,

communicating, between the base station and the terminal, the wake-up signal in accordance with the determined sequence design, and

in response to communicating the wake-up signal between the base station and the terminal, communicating at least one further signal between the base station and the terminal.

2. The method of claim 1 , wherein:

the sequence design comprises at least one of a spreading parameter and a scrambling parameter of a sequence generator for modifying a base sequence of the wake-up signal.

3. The method of claim 2 , wherein:

the spreading parameter is indicative of a range of spreading factors.

4. The method of claim 1 , wherein:

the sequence design comprises a sequence length of a base sequence of the wake-up signal modified by a sequence generator.

5. The method of claim 1 , wherein:

the sequence design comprises a base sequence of the wake-up signal optionally selected from the group comprising:

a randomly generated sequence;

a Zadoff-Chu sequence;

a sequence selected from a set of orthogonal or quasi-orthogonal sequences; and

a Walsh-Hadamard sequence.

6. The method of claim 5 , wherein:

the base sequence is uniquely associated with the terminal.

7. The method of claim 1 , wherein:

the sequence design comprises a checksum protection parameter.

8. The method of claim 1 , wherein:

the sequence design comprises a preamble parameter.

9. The method of claim 1 , wherein:

the downlink control message is indicative of a repetition level for coverage enhancement when communicating the wake-up signal.

10. The method of claim 1 , wherein:

the downlink control message is indicative of a range of allowed parameter values of at least one parameter of the sequence design.

11. The method of claim 1 , further comprising:

determining multiple sequence designs for multiple terminals connected to the base station.

12. The method of claim 1 , further comprising:

determining a group of a plurality of terminal groups, with which the terminal is associated, and

determining the sequence design depending on the determined group.

13. The method of claim 12 , wherein:

the group is determined based on at least one of the following: a distance between the terminal and the base station; a direction of the terminal with respect to the base station; and a signal quality of the wireless link between the terminal and the base station.

14. The method of claim 1 , further comprising:

determining the sequence design depending on a signal quality of a wireless link between the base station and the terminal.

15. The method of claim 1 , further comprising:

determining the sequence design depending on a mobility of the terminal.

16. The method of claim 1 , wherein the communicating the control message between the base station and the terminal comprises:

communicating a capability control message indicative of a limited power-related capability of the receiver of the terminal.

17. The method of claim 1 , further comprising:

cross-correlating a time-domain and/or frequency-domain bit/symbol sequence of the wakeup signal and a predefined reference sequence, and

based on said cross-correlating: selectively waking up a main receiver of the terminal.

18. The method of claim 1 , wherein:

the wake-up signal and the further signal are modulated onto different carrier frequencies and/or using different constellations and/or using different bandwidths and/or using different modulations.

19. The method of claim 1 , wherein:

the terminal is configured to operate in an idle mode when communicating the wake-up signal which is different to a further idle mode in which paging signals are communicated.

20. A device comprising control circuitry configured to:

communicate, between a base station and a terminal including a receiver, a control message indicative of a limited capability of the receiver reduced to supporting a set of candidate sequence designs when operated in a low power mode;

determine a sequence design of a wake-up signal based on the limited capability of the receiver when operated in the low power mode;

communicate, between the base station and the terminal, a downlink control message indicative of a sequence design of the wake-up signal;

communicate, between the base station and the terminal, the wake-up signal in accordance with the determined sequence design; and

in response to communicating the wake-up signal between the base station and the terminal, communicate at least one further signal between the base station and the terminal.