Method and apparatus for power saving enhancements with a wake-up signal for a dual-radio system
Various solutions for power saving enhancements with a wake-up signal for a dual-radio system are described. An apparatus may configure a main radio of the apparatus to enter a sleep mode and a secondary radio of the apparatus to be in an active mode. The apparatus may receive, via the secondary radio, a first signal from a network node. The apparatus may apply the first signal for at least one of: a time or frequency synchronization with the network node; an indication of whether to wake up the main radio from the sleep mode; and a signal quality measurement.
1 . A method, comprising:
configuring, by a processor of an apparatus, a main radio of the apparatus to enter a sleep mode and a secondary radio of the apparatus to be in an active mode;
receiving, via the secondary radio, a first signal from a network node;
applying, by the processor, the first signal for at least one of:
a time or frequency synchronization with the network node;
an indication of whether to wake up the main radio from the sleep mode; and
a signal quality measurement; and
reporting, via the main radio, beam information to the network node when the apparatus is operating in a radio resource control (RRC) inactive state, wherein the beam information indicates a selected beam, and the first signal is transmitted to the apparatus at a direction of the selected beam.
2 . The method of claim 1 , wherein the secondary radio is a low-power receiver, and the first signal is in a specific waveform that the low-power receiver is capable of processing.
3 . The method of claim 1 , wherein the signal quality measurement comprises at least one of:
a radio resources management (RRM) measurement;
a radio link monitoring (RLM) measurement; and
a beam failure detection (BFD) measurement.
4 . The method of claim 3 , wherein the RRM measurement is performed for at least one of a serving cell and a neighboring cell, and the first signal comprises information for cell recognition when the RRM measurement is performed for both the serving cell and the neighboring cell.
5 . The method of claim 1 , wherein the signal quality measurement is performed via the secondary radio based on the first signal, or is performed via the main radio when a signal quality of the first signal is below a threshold.
6 . The method of claim 1 , further comprising:
measuring, via the main radio, one or more synchronization signal blocks (SSBs) for beam selection;
wherein the beam information comprises an index of one of the one or more SSBs with a strongest reference signal receiving power (RSRP).
7 . The method of claim 1 , wherein the beam information is delivered based on an association between an SSB and a physical uplink shared channel (PUSCH) occasion.
8 . The method of claim 6 , wherein measuring the one or more SSBs is performed periodically or only when the main radio is woken up from the sleep mode.
9 . The method of claim 6 , wherein measuring the one or more SSBs is performed when a signal strength of the first signal is below a threshold.
10 . The method of claim 1 , further comprising:
receiving, via the secondary radio, a second signal from the network node, wherein the second signal comprises a beacon or a secondary synchronization signal (SSS) only.
11 . The method of claim 10 , further comprising:
measuring, via the main radio, one or more synchronization signal blocks (SSBs) for beam selection when a signal strength of the second signal is below a threshold;
wherein the second signal is transmitted to the apparatus at the direction of the selected beam.
12 . The method of claim 10 , wherein the second signal is transmitted to the apparatus in a beam sweeping manner to assist the apparatus with beam selection.
13 . The method of claim 1 , wherein the first signal is transmitted to the apparatus in a beam sweeping manner or in a repetition manner when the apparatus is operating in an RRC idle state.
14 . An apparatus, comprising:
a transceiver which, during operation, wirelessly communicates with a network node of a wireless network, wherein the transceiver comprises a main radio and a secondary radio; and
a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:
configuring the main radio to enter a sleep mode and the secondary radio to be in an active mode;
receiving, via the secondary radio, a first signal from the network node; and
applying the first signal for at least one of:
a time or frequency synchronization with the network node;
an indication of whether to wake up the main radio from the sleep mode; and
a signal quality measurement; and
reporting, via the main radio, beam information to the network node when the apparatus is operating in a radio resource control (RRC) inactive state, wherein the beam information indicates a select beam, and the first signal is transmitted to the apparatus at a direction of the selected beam.
15 . The apparatus of claim 14 , wherein the secondary radio is a low-power receiver, and the first signal is in a specific waveform that the low-power receiver is capable of processing.
16 . The apparatus of claim 14 , wherein the signal quality measurement comprises at least one of:
a radio resources management (RRM) measurement;
a radio link monitoring (RLM) measurement; and
a beam failure detection (BFD) measurement.
17 . The apparatus of claim 16 , wherein the RRM measurement is performed for at least one of a serving cell and a neighboring cell, and the first signal comprises information for cell recognition when the RRM measurement is performed for both the serving cell and the neighboring cell.
18 . The apparatus of claim 14 , wherein the signal quality measurement is performed via the secondary radio based on the first signal, or is performed via the main radio when a signal quality of the first signal is below a threshold.