Techniques for configuring cell wake-up signal in wireless communications
Methods, systems, and devices for wireless communications are described that provide a lower power sleep procedure at network entities to reduce network power consumption. Network entities may monitor for a wake-up signal (WUS) from at least one user equipment (UE) during configured WUS occasions while operating in such a lower power mode. A WUS configuration may be provided that includes at least some link maintenance WUS occasions, and a link maintenance communication may be transmitted using such a link maintenance WUS occasion if no communications are present for a threshold time period at a UE. A network entity that receives the link maintenance communications may transmit a response message, and a quality of the communications link between the UE and network entity may be confirmed, or one or more transmission parameters adjusted.
1 . A method for wireless communication at a user equipment (UE), comprising:
receiving configuration information for a set of wake-up signal occasions associated with a network entity, the configuration information indicating a first subset of the set of wake-up signal occasions for cell activation requests of a cell associated with the network entity, and a second subset of the set of wake-up signal occasions for link maintenance communications associated with a communication link between the UE and the network entity;
transmitting a first wake-up signal during a first wake-up signal occasion of the first subset of wake-up signal occasions based at least in part on a presence of data traffic that is to be transmitted from the UE;
transmitting a second wake-up signal during a second wake-up signal occasion of the second subset of wake-up signal occasions based at least in part on an elapsed time from a prior communication with the network entity exceeding a threshold value;
receiving a wake-up signal response from the network entity indicative of a quality of the communication link between the UE and the network entity responsive to the second wake-up signal; and
resetting the elapsed time from the prior communication responsive to the wake-up signal response.
2 . The method of claim 1 , wherein the second wake-up signal indicates that link maintenance of the communication link between the UE and the network entity is requested instead of cell activation of the cell associated with the network entity.
3 . The method of claim 1 , wherein the receiving the configuration information comprises:
receiving one or more of a periodicity or an offset associated with the set of wake-up signal occasions that indicates the second subset of wake-up signal occasions.
4 . The method of claim 1 , further comprising:
resetting the elapsed time from the prior communication responsive to one or more communications with the network entity using the communication link between the UE and the network entity.
5 . The method of claim 1 , further comprising:
resetting the elapsed time from the prior communication responsive to receiving a network response to the first wake-up signal.
6 . The method of claim 1 , wherein the wake-up signal response includes an identification of a source of an associated wake-up signal, and wherein the resetting the elapsed time is responsive to the identification corresponding to an identity of the UE.
7 . The method of claim 6 , wherein the identification of the source of the associated wake-up signal includes one or more of a random access preamble identification, an identification provided with a scheduling request, a radio network temporary identifier of the UE, or any combinations thereof.
8 . The method of claim 1 , further comprising:
adjusting one or more transmission parameters associated with the communication link between the UE and the network entity based at least in part on the wake-up signal response.
9 . The method of claim 8 , wherein the wake-up signal response indicates one or more of a transmission power adjustment, a beam update, a transmission configuration indication (TCI) state update, a received power associated with the second wake-up signal, or any combinations thereof.
10 . The method of claim 1 , further comprising:
transmitting a third wake-up signal during a third wake-up signal occasion of the second subset of wake-up signal occasions based at least in part on the elapsed time from the prior communication with the network entity exceeding a threshold value; and
transmitting a link failure indication to the network entity responsive to a failure to receive a response to the third wake-up signal.
11 . The method of claim 10 , further comprising:
transmitting one or more additional wake-up signals during one or more other wake-up signal occasions of the second subset of wake-up signal occasions responsive to a failure to receive a response to the third wake-up signal; and
transmitting the link failure indication to the network entity responsive to a failure to receive a response to the one or more additional wake-up signals.
12 . The method of claim 10 , wherein the link failure indication is transmitted via a different cell associated with the network entity, using a different wake-up signal occasion of a different wake-up signal configuration, using an initial access procedure, or any combinations thereof.
13 . A method for wireless communication at a network entity, comprising:
transmitting configuration information for a set of wake-up signal occasions associated with a network entity to a user equipment (UE), the configuration information indicating a first subset of the set of wake-up signal occasions for cell activation requests of a cell associated with the network entity, and a second subset of the set of wake-up signal occasions for link maintenance communications associated with a communication link between the UE and the network entity;
monitoring for a first wake-up signal during a first wake-up signal occasion of the first subset of wake-up signal occasions that indicates a presence of data traffic that is to be transmitted from the UE;
monitoring for a second wake-up signal during a second wake-up signal occasion of the second subset of wake-up signal occasions that indicates a link maintenance associated with the communication link is requested; and
transmitting a wake-up signal response to the UE indicative of a quality of the communication link between the UE and the network entity responsive to the second wake-up signal.
14 . The method of claim 13 , wherein the second wake-up signal indicates that link maintenance of the communication link between the UE and the network entity is requested instead of cell activation of the cell associated with the network entity.
15 . The method of claim 13 , wherein the transmitting the configuration information comprises:
transmitting one or more of a periodicity or an offset associated with the set of wake-up signal occasions that indicates the second subset of wake-up signal occasions.
16 . The method of claim 13 , wherein the transmitting the configuration information comprises:
transmitting an indication of a time threshold value associated with the second subset of wake-up signal occasions, wherein a wake-up signal is to be transmitted in the second subset of wake-up signal occasions responsive to an elapsed time from a prior communication via the communication link exceeding the time threshold value.
17 . The method of claim 13 , wherein the wake-up signal response includes an identification of a source of the second wake-up signal.
18 . The method of claim 17 , wherein the identification of the source of the second wake-up signal includes one or more of a random access preamble identification, an identification provided with a scheduling request, a radio network temporary identifier of the UE, or any combinations thereof.
19 . The method of claim 13 , further comprising:
adjusting one or more transmission parameters associated with the communication link between the UE and the network entity based at least in part on the second wake-up signal.
20 . The method of claim 19 , wherein the wake-up signal response indicates one or more of a transmission power adjustment, a beam update, a transmission configuration indication (TCI) state update, a received power associated with the second wake-up signal, or any combinations thereof.
21 . The method of claim 13 , further comprising:
receiving a link failure indication from the UE that indicates a failure to receive a response to a third wake-up signal during a third wake-up signal occasion of the second subset of wake-up signal occasions; and
initiating a beam failure recovery procedure responsive to the link failure indication.
22 . The method of claim 21 , wherein the link failure indication is received via a different cell associated with the network entity, via a different wake-up signal occasion of a different wake-up signal configuration, via an initial access procedure, or any combinations thereof.
23 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more processors;
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
receive configuration information for a set of wake-up signal occasions associated with a network entity, the configuration information indicating a first subset of the set of wake-up signal occasions for cell activation requests of a cell associated with the network entity, and a second subset of the set of wake-up signal occasions for link maintenance communications associated with a communication link between the UE and the network entity;
transmit a first wake-up signal during a first wake-up signal occasion of the first subset of wake-up signal occasions based at least in part on a presence of data traffic that is to be transmitted from the UE;
transmit a second wake-up signal during a second wake-up signal occasion of the second subset of wake-up signal occasions based at least in part on an elapsed time from a prior communication with the network entity exceeding a threshold value;
receiving a wake-up signal response from the network entity indicative of a quality of the communication link between the UE and the network entity responsive to the second wake-up signal; and
resetting the elapsed time from the prior communication responsive to the wake-up signal response.
24 . The apparatus of claim 23 , wherein the second wake-up signal indicates that link maintenance of the communication link between the UE and the network entity is requested instead of cell activation of the cell associated with the network entity.
25 . An apparatus for wireless communication at a network entity, comprising:
one or more processors;
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
transmit configuration information for a set of wake-up signal occasions associated with a network entity to a user equipment (UE), the configuration information indicating a first subset of the set of wake-up signal occasions for cell activation requests of a cell associated with the network entity, and a second subset of the set of wake-up signal occasions for link maintenance communications associated with a communication link between the UE and the network entity;
monitor for a first wake-up signal during a first wake-up signal occasion of the first subset of wake-up signal occasions that indicates a presence of data traffic that is to be transmitted from the UE;
monitor for a second wake-up signal during a second wake-up signal occasion of the second subset of wake-up signal occasions that indicates a link maintenance associated with the communication link is requested; and
transmit a wake-up signal response to the UE indicative of a quality of the communication link between the UE and the network entity responsive to the second wake-up signal.
26 . The apparatus of claim 25 , wherein the second wake-up signal indicates that link maintenance of the communication link between the UE and the network entity is requested instead of cell activation of the cell associated with the network entity.
27 . The apparatus of claim 25 , wherein the instructions to transmit the configuration information are executable by the one or more processors to cause the apparatus to:
transmit an indication of a time threshold value associated with the second subset of wake-up signal occasions, wherein a wake-up signal is to be transmitted in the second subset of wake-up signal occasions responsive to an elapsed time from a prior communication via the communication link exceeding the time threshold value.