Enhancement for paging indication and radio resource management (RRM) measurements for UE power saving in a wireless network
In one aspect, a User Equipment (UE) performs Radio Resource Management (RRM) measurements on downlink signals with a first cycle period equal to the UE's Discontinuous Reception (DRX) cycle period. The RRM measurements cycle period is lengthened when UE detects that a signal quality measurement of the primary cell is greater than the sum of a positive offset and a signal quality measurement of a neighboring cell having the best signal quality among all of UE's neighboring cells. In another aspect, a UE de-multiplexes a paging indication which precedes a Synchronization Signal Block (SSB) in time and is generated using the same sequence generation formula as that for generating a Secondary Synchronization Signal (SSS) in the SSB. From the de-multiplexed paging indication, the UE detects that it is paged for message reception and wakes up to receive the message in a next data reception period of the UE's DRX cycle.
1. A method performed by a user equipment (UE) in a wireless network for Radio Resource Management (RRM) measurements, comprising:
performing RRM measurements on downlink signals with a first cycle period equal to a Discontinuous Reception (DRX) cycle period of the UE, wherein the downlink signals are broadcast periodically from a base station;
detecting an indication that a signal quality measurement of the primary cell is greater than a sum of a positive offset and a signal quality measurement of a best neighboring cell that has a best signal quality among all of neighboring cells of the UE; and
in response to the indication, performing the RRM measurements with a second cycle period which is longer than the first cycle period.
2. The method of claim 1 , further comprising:
in response to another indication that the signal quality of the primary cell drops below the sum, performing the RRM measurements with the first cycle period.
3. The method of claim 1 , wherein when the positive offset of Y value corresponds to a longer second cycle period, and the positive offset of X value corresponds to a shorter second cycle period, and wherein Y>X.
4. The method of claim 3 , wherein the longer second cycle period is four times the DRX cycle period.
5. The method of claim 3 , wherein the longer second cycle period is two times the DRX cycle period.
6. The method of claim 1 , further comprising:
calculating a difference between two consecutive signal quality measurements of the primary cell; and
performing the RRM measurements in response to the detection when the difference is below a predetermined threshold.
7. The method of claim 1 , wherein the downlink signals are Synchronization Signal Blocks (SSBs).
8. The method of claim 1 , wherein the RRM measurements may include measurements of one or more of: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and Signal to interference and noise ratio (SINR).
9. The method of claim 1 , wherein the wireless network is a Fifth Generation New Radio (5G NR) network.