UE PDCCH Monitoring Offset Before DRX Active Time
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Solution Overview
Problem
There is a need for a method to efficiently save power in user equipment (UE) in wireless communication systems, particularly in 5G networks, to enable longer service provision times.
Innovation Solution
The method involves receiving power saving offset (PS-offset) signaling from a base station to adjust monitoring of physical downlink channels for downlink control information outside the discontinuous reception active time, identifying specific monitoring occasions based on the PS-offset and search space parameters, and monitoring DCI on these occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors PDCCH for DCI during DRX active time, then the reliability of receiving power saving information is improved, but the power consumption increases
Solution Approach 1:
The base station transmits power saving information to the UE before the DRX active time begins. The UE monitors PDCCH at specific occasions prior to the drx-onDurationTimer start time, allowing the UE to receive power saving information in advance and potentially enter sleep mode earlier, thus reducing power consumption while maintaining reliability of information reception.
2Loss of information
If the UE monitors PDCCH at all configured occasions, then the completeness of control information reception is improved, but the power consumption increases
Solution Approach 1:
The patent extracts and monitors only specific PDCCH occasions that are relevant for power saving information, rather than monitoring all PDCCH occasions. The UE identifies and monitors only those PDCCH occasions that occur before the DRX active time and carry power saving information, filtering out unnecessary monitoring occasions to reduce power consumption while maintaining completeness of essential control information reception.
3Reliability
If the UE extends monitoring time before DRX active time, then the reliability of receiving power saving information is improved, but the time available for service is reduced
Solution Approach 1:
The UE performs partial monitoring of PDCCH occasions - specifically monitoring only those occasions that occur before the DRX active time and are configured for power saving information. This partial monitoring approach provides sufficient reliability for receiving power saving information without excessively extending the monitoring time, thus balancing reliability with time available for service provision.
Data Source
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.