Low-power wake up radio operation in wireless communication
A user equipment (UE) is configured to enter a radio resource control (RRC) state with a base station wherein network operations are performed using a main radio (MR), receive a first set of parameters from the base station for wakeup radio (WUR) state operation wherein the UE enables a WUR and powers down the MR to an off or deep sleep state, the first set of parameters including a parameter enabling the WUR state operation and a configuration of WUR reference signaling (WUR-RS), receive a second set of parameters from the base station for WUR setup and a WUR signal (WUR-S) configuration and enter the WUR state from the RRC state, wherein, while in the WUR state, the UE performs uses the WUR including at least one of monitoring for the WUR-S, measuring the WUR-RS, or implementing a WUR discontinuous reception (DRX) cycle for WUR-S and WUR-RS signal monitoring.
1 . A processor of a user equipment (UE) configured to perform operations comprising:
entering a radio resource control (RRC) state with a base station;
receiving a first set of parameters from the base station for a wakeup radio (WUR) state wherein the UE enables a WUR and powers down a main radio (MR) to an off state or to a deep sleep state with reduced power consumption, the first set of parameters including a parameter enabling the WUR state for the UE, a configuration for a WUR reference signal (WUR-RS) and a trigger condition for the UE to switch from the WUR state to the RRC State, wherein the trigger condition is based on a reference signal received power (RSRP) threshold;
receiving a second set of parameters from the base station for a WUR setup and a configuration for a WUR signal (WUR-S); and
entering the WUR state from the RRC state, wherein, while in the WUR state, the UE performs, using the WUR, at least one of monitoring for the WUR-S, measuring the WUR-RS, or implementing a WUR discontinuous reception (DRX) cycle.
2 . The processor of claim 1 , wherein the trigger condition comprises a signal energy threshold for WUR-RS measurements, wherein, when a signal energy is below the signal energy threshold, the UE switches from the WUR state to the RRC state.
3 . The processor of claim 1 , wherein the first set of parameters are received in a system information block (SIB) or via dedicated RRC signaling.
4 . The processor of claim 1 , wherein the configuration for the WUR-S includes a repetition number for the WUR-S, a time domain location for the WUR-S, and a frequency domain location for the WUR-S.
5 . The processor of claim 4 , wherein the configuration for the WUR-S further comprises a sequence ID for the WUR-S.
6 . The processor of claim 1 , wherein the operations further comprise:
transmitting a WUR request to the base station, wherein the WUR request includes assistance information used by the base station to determine whether the WUR state is enabled, wherein the assistance information comprises RSRP results that are measured by the WUR of the UE, a mobility status of the UE, a throughput profile or a traffic model profile.
7 . The processor of claim 1 , wherein the operations further comprise:
transmitting an acknowledgement for the receiving of the second set of parameters, wherein the acknowledgement is HARQ-ACK feedback transmitted over a physical uplink control channel (PUCCH) in slot n+k, wherein the second set of parameters from the base station is received over a physical downlink shared channel (PDSCH) in slot n and a value of k is hard-encoded in specification.
8 . The processor of claim 1 , wherein the UE is further configured with a WUR-RS based measurement report, wherein the WUR-RS based measurement report is transmitted based on a trigger event or periodically.
9 . The processor of claim 1 , wherein the operations further comprise:
transitioning from the WUR state to the RRC state.
10 . The processor of claim 1 , wherein entering the WUR state comprises powering down a main radio (MR) or switching the MR into a deep sleep state.
11 . A method, comprising:
at a user equipment (UE):
entering a radio resource control (RRC) state with a base station;
receiving a first set of parameters from the base station for a wakeup radio (WUR) state wherein the UE enables a WUR and powers down a main radio (MR) to an off state or to a deep sleep state with reduced power consumption, the first set of parameters including a parameter enabling the WUR state for the UE, a configuration for a WUR reference signal (WUR-RS) and a trigger condition for the UE to switch from the WUR state to the RRC State, wherein the trigger condition is based on a reference signal received power (RSRP) threshold;
receiving a second set of parameters from the base station for a WUR setup and a configuration for a WUR signal (WUR-S); and
entering the WUR state from the RRC state, wherein, while in the WUR state, the UE performs, using the WUR, at least one of monitoring for the WUR-S, measuring the WUR-RS, or implementing a WUR discontinuous reception (DRX) cycle.
12 . The method of claim 11 , wherein the trigger condition comprises a signal energy threshold for WUR-RS measurements, wherein, when a signal energy is below the signal energy threshold, the UE switches from the WUR state to the RRC state.
13 . The method of claim 11 , wherein the first set of parameters are received in a system information block (SIB) or via dedicated RRC signaling.
14 . The method of claim 11 , wherein the configuration for the WUR-S includes a repetition number for the WUR-S, a time domain location for the WUR-S, and a frequency domain location for the WUR-S.
15 . The method of claim 14 , wherein the configuration for the WUR-S further comprises a sequence ID for the WUR-S.
16 . The method of claim 11 , further comprising:
transmitting a WUR request to the base station, wherein the WUR request includes assistance information used by the base station to determine whether the WUR state is enabled, wherein the assistance information comprises reference signal received power (RSRP) results that are measured by the WUR of the UE, a mobility status of the UE, a throughput profile or a traffic model profile.
17 . The method of claim 11 , further comprising:
transmitting an acknowledgement for the receiving of the second set of parameters, wherein the acknowledgement is HARQ-ACK feedback transmitted over a physical uplink control channel (PUCCH) in slot n+k, wherein the second set of parameters from the base station is received over a physical downlink shared channel (PDSCH) in slot n and a value of k is hard-encoded in specification.
18 . The method of claim 11 , wherein the UE is further configured with a WUR-RS based measurement report, wherein the WUR-RS based measurement report is transmitted based on a trigger event or periodically.
19 . The method of claim 11 , further comprising:
transitioning from the WUR state to the RRC state.