UE Receiver Power Switching for DRX Mode
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Solution Overview
Problem
The long periodicity of 5G NR SSBs leads to increased on-duration times for UE power saving in DRX mode, resulting in significant power consumption and reduced standby time due to the lack of CRS in 5G NR, which necessitates longer warm-up times and inefficient bandwidth usage.
Innovation Solution
Adaptive RX switching patterns are implemented, allowing for the separation of on-duration into dis-contiguous portions for SSB and PO reception, and opportunistic skipping of reference symbols within the SSB, enabling reduced time and bandwidth overheads by adjusting RF bandwidth and sampling rates based on time-gaps and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE uses SSB for warm-up in 5G NR DRX mode, then timing and frequency tracking can be achieved, but on-duration time becomes excessively long due to SSB's long periodicity
Solution Approach 1:
The on-duration is segmented into multiple parts: a first part for SSB reception and a second part for PO reception. This segmentation allows the UE to receive SSB and PO in separate time intervals, reducing the total on-duration time while maintaining tracking accuracy.
Solution Approach 2:
The UE performs timing and frequency offset estimation using SSB signals received in the first part of on-duration before actually receiving the PO in the second part. This preliminary action enables the UE to compensate for drifts in advance, ensuring accurate PO demodulation without requiring the RF receiver to remain continuously active.
2Reliability
If UE keeps RF receiver on continuously for PO reception, then paging reception reliability is maintained, but power consumption increases significantly
Solution Approach 1:
The RF receiver operates periodically rather than continuously - it is activated only during the segmented on-duration intervals for SSB and PO reception, then switched off during the majority of the DRX cycle. This periodic operation dramatically reduces power consumption while maintaining reliable paging reception when needed.
Solution Approach 2:
The UE performs preliminary timing and frequency offset estimation using SSB signals before PO reception. This preliminary action ensures that when the RF receiver is activated for PO reception, it can immediately achieve reliable demodulation without requiring extended warm-up time, thus reducing overall power consumption.
3Measurement precision
If UE uses full RF bandwidth for SSB reception, then signal quality is maintained, but bandwidth overhead and power consumption increase
Solution Approach 1:
The UE applies different reception configurations to different parts of the on-duration: using appropriate bandwidth for SSB reception in the first part, and then switching to PO-specific bandwidth configuration in the second part. This local quality adjustment optimizes signal quality for each reception task while minimizing overall bandwidth overhead.
Data Source
AI summary
Methods and devices including a processing circuit for a User Equipment, UE, wherein the UE includes a radio frequency, RF, receiver, wherein the processing circuit is configured to set a power switching pattern of the RF receiver for UE power saving in Discontinuous Reception, DRX, Radio Resource Control, RRC, IDLE mode based on a paging occasion, PO, and a signal block associated with the PO.