UE PDCCH Monitoring Offsets for DRX Power Saving
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Solution Overview
Problem
There is a need for a method to efficiently conserve power in user equipment (UE) in wireless communication systems, particularly in 5G networks, to enable prolonged service provision.
Innovation Solution
A method and apparatus that involves receiving power saving offset (PS-offset) signaling from a base station to adjust PDCCH monitoring occasions outside the discontinuous reception (DRX) active time, allowing UE to identify specific monitoring times for downlink control information (DCI) based on configured search spaces, thereby optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors PDCCH for DCI outside DRX active time to ensure timely reception of power saving information and other control messages, then the reliability of control information reception is improved, but the power consumption of the UE increases
Solution Approach 1:
The network configures PDCCH monitoring occasions in advance outside DRX active time, allowing the UE to know exactly when to wake up and monitor PDCCH. This preliminary configuration enables the UE to sleep during non-monitoring periods while still reliably receiving control information at predetermined times without continuous monitoring
Solution Approach 2:
The UE monitors PDCCH at periodic intervals defined by monitoring occasions configured by the network, rather than continuously. The monitoring period and offset parameters create a rhythmic monitoring pattern that balances reliability of control information reception with power conservation during intervals between monitoring occasions
2Reliability
If the UE monitors PDCCH at all configured monitoring occasions to ensure no control information is missed, then the completeness of control information reception is improved, but the processing complexity and power consumption increase
Solution Approach 1:
The network extracts and configures specific monitoring occasions outside DRX active time separately from the standard DRX monitoring pattern. This allows the UE to exclude these specially configured occasions from continuous monitoring requirements, reducing overall monitoring complexity while ensuring critical power saving information is received
Solution Approach 2:
The network provides advance configuration of monitoring occasion parameters (period, offset, duration) before the UE needs to monitor. This preliminary setup allows the UE to pre-calculate monitoring times and prepare accordingly, reducing real-time processing complexity during actual monitoring events
Data Source
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AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method comprises: receiving, from a base station, higher layer signaling comprising a power saving offset (PS-offset) indicating a first start time when the UE starts, prior to a second start time of a drx-onDuration timer, monitoring physical downlink channel (PDCCH) for downlink control information (DCI) notifying power saving information outside a discontinuous reception (DRX) active time and parameters indicating a search space; identifying at least one PDCCH monitoring occasion for the DCI based on the PS-offset and the parameters indicating the search space; and monitoring the DCI on the at least one PDCCH monitoring occasion.