Wake-up signal design

1. An apparatus of a user equipment (UE) operable for wake-up signal (WUS) communication in a wireless network, the apparatus comprising:

one or more processors configured to:

identify, at the UE, a resource set for a WUS with a repetition level, wherein:

the resource set for the WUS includes a mapping of the WUS that associates the WUS with one or more physical resource blocks and one or more orthogonal frequency division multiplexing (OFDM) symbols,

the repetition level identifies a number of base sequences for the WUS in the resource set, and

the WUS includes a cell-specific sequence generated from a Zadoff-Chu (ZC) sequence with a Gold cover code sequence initialized by a UE-specific parameter using g(n) g(n)=e −jπμn′(n′+1)/L ZC , where g(n) is the cell-specific sequence, μ is predetermined or configured via cell-specific signaling, n′ is n mod L zc , and L zc is a length of the ZC sequence;

monitor, at the UE, the resource set for the WUS with the repetition level;

decode, at the UE, a transmission received from a base station in the resource set for the WUS; and

switch, at the UE, to a network access mode (NAM) from a power saving mode (SM) based on a detection of the WUS in the resource set; and

a memory interface configured to store the resource set for the WUS in a memory.

2. The apparatus of claim 1 , wherein the one or more processors are further configured to:

detect, at the UE, the repetition level of the resource set for the WUS.

3. The apparatus of claim 1 , wherein the WUS, further includes a UE-specific sequence.

4. The apparatus of claim 3 , wherein the UE-specific sequence is generated from a length-31 Gold sequence.

5. The apparatus of claim 1 , wherein the WUS includes a UE-specific initialization of a UE-specific sequence, wherein the UE-specific initialization is based on one or more of: a cell radio network temporary identifier (C-RNTI), a physical cell identifier (ID), a virtual cell ID, a bandwidth part ID (BWP ID), or a slot interval.

6. The apparatus of claim 1 , wherein the one or more processors are further configured to:

identify, at the UE, a length of a base sequence of the number of base sequences, wherein the length of the base sequence is based on a coverage target level of the UE and is configured via radio resource control (RRC) signaling.

7. The apparatus of claim 1 , wherein the one or more processors are further configured to:

identify, at the UE, the resource set for the WUS from one or more of:

a starting position in frequency of the resource set,

a bandwidth part (BWP) of the resource set,

a density of the resource set,

a bitmap of a frequency-domain location of the resource set,

a higher-layer parameter of a time-domain location,

one or more antenna ports for transmission of the WUS,

one or more slot indices of the resource set, or

one or more symbol indices of the resource set.

8. The apparatus of claim 1 , wherein the resource set for the WUS is configured via radio resource control (RRC) signaling.

9. An apparatus of a base station operable for wake-up signal (WUS) communication in a wireless network, the apparatus comprising:

one or more processors configured to:

determine, at the base station, a resource set for a WUS with a repetition level, wherein:

the resource set for the WUS includes a mapping of the WUS that associates the WUS with one or more physical resource blocks and one or more orthogonal frequency division multiplexing (OFDM) symbols,

the repetition level identifies a number of base sequences for the WUS in the resource set, and

the WUS includes a cell-specific sequence generated from a Zadoff-Chu (ZC) sequence with a Gold cover code sequence initialized by a UE-specific parameter using g(n) g(n)=e −jπμn′(n′+1)/L ZC , where g(n) is the cell-specific sequence, μ is predetermined or configured via cell-specific signaling, n′ is n mod L zc , and L zc is a length of the ZC sequence;

encode, at the base station for transmission to a user equipment (UE), the resource set for the WUS with the repetition level,

wherein the WUS signals the UE to switch to a network access mode (NAM) from a power saving mode (PSM); and

a memory interface configured to store the resource set for the WUS in a memory.

10. The apparatus of claim 9 , wherein the one or more processors are further configured to:

select, at the base station, the repetition level of the resource set for the WUS based on a channel condition of the UE.

11. The apparatus of claim 9 , wherein the WUS further includes a UE-specific sequence.

12. The apparatus of claim 11 , wherein the a UE-specific sequence is generated from a length- 31 Gold sequence.

13. The apparatus of claim 9 , wherein the WUS includes a UE-specific initialization of a UE-specific sequence, wherein the UE-specific initialization is based on one or more of: a cell radio network temporary identifier (C-RNTI), a physical cell identifier (ID), a virtual cell ID, a bandwidth part ID (BWP ID), or a slot interval.

14. The apparatus of claim 9 , wherein the one or more processors are further configured to:

determine, at the base station, a length of a base sequence of the number of base sequences, wherein the length of the base sequence is based on a coverage level of the UE and is configured via radio resource control (RRC) signaling.

15. The apparatus of claim 9 , wherein the resource set for the WUS is configured via radio resource control (RRC) signaling, wherein the resource set for the WUS is identifiable from one or more of:

a starting position in frequency of the resource set,

a bandwidth part (BWP) of the resource set,

a density of the resource set,

a bitmap of a frequency-domain location of the resource set,

a higher-layer parameter of a time-domain location,

one or more antenna ports for transmission of the WUS,

one or more slot indices of the resource set, or

one or more symbol indices of the resource set.

16. At least one machine readable storage medium having instructions embodied thereon for wake-up signal (WUS) communication in a wireless network, the instructions when executed by one or more processors at a user equipment (UE) perform the following:

identifying, at the UE, a resource set for a WUS with a repetition level, wherein:

the resource set for the WUS includes a mapping of the WUS that associates the WUS with one or more physical resource blocks and one or more orthogonal frequency division multiplexing (OFDM) symbols,

the repetition level identifies a number of base sequences for the WUS in the resource set, and

the WUS includes a cell-specific sequence generated from a Zadoff-Chu (ZC) sequence with a Gold cover code sequence initialized by a UE-specific e parameter using g(n) g(n)=e −jπμn′(n′+1)/L ZC , where g(n) is the cell-specific sequence, μ is predetermined or configured via cell-specific signaling, n′ is n mod L zc , and L zc is a length of the ZC sequence;

monitoring, at the UE, the resource set for the WUS with the repetition level;

decoding, at the UE, a transmission received from a base station in the resource set for the WUS; and

switching, at the UE, to a network access mode (NAM) from a power saving mode (PSM) based on a detection of the WUS in the resource set.

17. The at least one machine readable storage medium of claim 16 , further comprising instructions that when executed perform:

selecting, at the UE, the repetition level of the resource set for the WUS based on a channel condition of the UE.

18. The at least one machine readable storage medium of claim 16 , further comprising instructions that when executed perform:

identifying, at the UE, the resource set for the WUS from one or more of:

a starting position in frequency of the resource set,

a bandwidth part (BWP) of the resource set,

a density of the resource set,

a bitmap of a frequency-domain location of the resource set,

a higher-layer parameter of a time-domain location,

one or more antenna ports for transmission of the WUS,

one or more slot indices of the resource set, or

one or more symbol indices of the resource set.