Techniques and apparatuses for wakeup signal transmission
A method, an apparatus, a base station, a user equipment (UE), and a computer program product for wireless communication are provided. The base station may encode a wakeup signal so that a preamble of the wakeup signal indicates whether the wakeup signal is relevant to the UE. The UE may select a technique for detecting the wakeup signal based at least in part on a partial, full, or no synchronization. In some aspects, the wakeup signal may be encoded with a system frame number. In some aspects, wakeup signals for guardband/standalone UEs are provided. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
detecting a wakeup signal based at least in part on an operating condition of the UE, wherein the operating condition includes an extended discontinuous reception (eDRX) cycle of the UE;
determining that the wakeup signal detected by the UE is associated with the UE based at least in part on the wakeup signal being for a UE group that includes the UE, wherein at least one of a portion of a UE group identifier associated with the UE group, or a portion of a cell identity associated with the UE group, is identified by a preamble of the wakeup signal, and wherein a scrambling sequence of the preamble is based, at least in part, on a system frame number (SFN) and one or more of the portion of the UE group identifier or the portion of the cell identity; and
receiving a communication based at least in part on the wakeup signal.
2. The method of claim 1 , further comprising:
performing synchronization using the wakeup signal based at least in part on a timing or frequency drift estimation of the UE.
3. The method of claim 1 , wherein the wakeup signal is detected after a partial synchronization of the UE using a synchronization signal.
4. The method of claim 1 , wherein the wakeup signal is detected after a full synchronization of the UE using one or more synchronization signals.
5. The method of claim 1 , further comprising:
selecting a technique to use to detect the wakeup signal,
wherein the technique includes one of:
a first synchronization technique in which no synchronization of the UE is performed,
a second synchronization technique in which a partial synchronization of the UE is performed, or
a third synchronization technique in which a full synchronization of the UE is performed.
6. The method of claim 1 , wherein the portion of the UE group identifier includes an entirety of the UE group identifier, or wherein the portion of the cell identity includes an entirety of the cell identity.
7. The method of claim 1 , wherein the preamble is encoded using a sequence with a length corresponding to two or more symbols.
8. The method of claim 1 , wherein a phase shift of the preamble identifies the portion of the UE group identifier.
9. The method of claim 1 , wherein the system frame number is a system frame number of a base station.
10. The method of claim 1 , wherein the wakeup signal punctures one or more resources allocated for at least one reference signal.
11. The method of claim 1 , wherein the wakeup signal is composed of a sequence that is repeated over multiple resource blocks within a narrowband.
12. The method of claim 1 , wherein the preamble of the wakeup signal comprises a wakeup signal sequence.
13. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
detecting a wakeup signal based at least in part on an operating condition of the UE, wherein the operating condition includes an extended discontinuous reception (eDRX) cycle of the UE;
determine that the wakeup signal detected by the UE is associated with the UE based at least in part on the wakeup signal being for a UE group that includes the UE, wherein at least one of a portion of a UE group identifier associated with the UE group, or a portion of a cell identity associated with the UE group, is identified by a preamble of the wakeup signal, and wherein a scrambling sequence of the preamble is based, at least in part, on a system frame number (SFN) and one or more of the portion of the UE group identifier or the portion of the cell identity; and
receive a communication based at least in part on the wakeup signal.
14. The UE of claim 13 , wherein the one or more processors are further configured to:
perform synchronization using the wakeup signal based at least in part on a timing or frequency drift estimation of the UE.
15. The UE of claim 13 , wherein the wakeup signal is detected after a partial synchronization of the UE using a synchronization signal.
16. The UE of claim 13 , wherein the wakeup signal is detected after a full synchronization of the UE using one or more synchronization signals.
17. The UE of claim 13 , wherein the one or more processors are further configured to:
select a technique to use to detect the wakeup signal based at least in part on an operating condition or parameter of the UE,
the technique including one of:
a first synchronization technique in which no synchronization of the UE is performed,
a second synchronization technique in which a partial synchronization of the UE is performed, or
a third synchronization technique in which a full synchronization of the UE is performed.
18. The UE of claim 13 , wherein the preamble is encoded using a sequence with a length corresponding to two or more symbols.
19. The UE of claim 13 , wherein a phase shift of the preamble identifies the portion of the UE group identifier.
20. The UE of claim 13 , wherein the scrambling sequence of the preamble identifies the portion of the UE group identifier and/or the portion of the cell identity.
21. The UE of claim 20 , wherein the system frame number is a system frame number of a base station.
22. The UE of claim 13 , wherein the wakeup signal punctures one or more resources allocated for at least one reference signal.
23. The UE of claim 13 , wherein the wakeup signal is composed of a sequence that is repeated over multiple resource blocks within a narrowband.
24. The UE of claim 13 , wherein the portion of the UE group identifier includes an entirety of the UE group identifier.
25. The UE of claim 13 , wherein the portion of the cell identity includes an entirety of the cell identity.
26. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
detecting a wakeup signal based at least in part on an operating condition of the UE, wherein the operating condition includes an extended discontinuous reception (eDRX) cycle of the UE;
determine that the wakeup signal detected by the UE is associated with the UE based at least in part on the wakeup signal being for a UE group that includes the UE, wherein at least one of a portion of a UE group identifier associated with the UE group, or a portion of a cell identity associated with the UE group, is identified by a preamble of the wakeup signal, and wherein a scrambling sequence of the preamble is based, at least in part, on a system frame number (SFN) and one or more of the portion of the UE group identifier or the portion of the cell identity; and
receive a communication based at least in part on the wakeup signal.
27. The non-transitory computer-readable medium of claim 26 , wherein the preamble is encoded using a sequence with a length corresponding to two or more symbols.
28. The non-transitory computer-readable medium of claim 26 , wherein the instructions further comprise:
one or more instructions that cause the one or more processors to perform synchronization using the wakeup signal based at least in part on a timing or frequency drift estimation of the UE.
29. The non-transitory computer-readable medium of claim 26 , wherein the portion of the UE group identifier includes an entirety of the UE group identifier.
30. The non-transitory computer-readable medium of claim 26 , wherein the portion of the cell identity includes an entirety of the cell identity.
31. An apparatus for wireless communication, comprising:
means for detecting a wakeup signal based at least in part on an operating condition of the apparatus, wherein the operating condition includes an extended discontinuous reception (eDRX) cycle of the apparatus;
means for determining that the wakeup signal detected by the apparatus is associated with the apparatus based at least in part on the wakeup signal being for a group that includes the apparatus, wherein at least one of a portion of a group identifier associated with the group, or a portion of a cell identity associated with the group, is identified by a preamble of the wakeup signal, and wherein a scrambling sequence of the preamble is based, at least in part, on a system frame number (SFN) and one or more of the portion of the UE group identifier or the portion of the cell identity; and
means for receiving a communication based at least in part on the wakeup signal.
32. The apparatus of claim 31 , wherein the preamble is encoded using a sequence with a length corresponding to two or more symbols.
33. The apparatus of claim 31 , further comprising:
means for performing synchronization using the wakeup signal based at least in part on a timing or frequency drift estimation of the UE.
34. The apparatus of claim 31 , wherein the portion of the group identifier includes an entirety of the group identifier, or wherein the portion of the cell identity includes an entirety of the cell identity.