Cross Slot Scheduling for Power Saving in Wireless Communication
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently reducing power consumption of user equipment (UE) due to limitations in cross-slot scheduling, particularly when multiple search space sets are involved, leading to reduced power saving performance.
Innovation Solution
A method is proposed where the UE monitors a physical downlink control channel (PDCCH) on at least one search space set based on a minimum slot offset, allowing for micro sleep periods and reducing unnecessary PDSCH buffering, thereby enhancing power saving gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-slot scheduling is used with multiple search space sets, then scheduling flexibility is improved, but power consumption of UE increases
Solution Approach 1:
The patent applies periodic action by configuring the UE to monitor PDCCH only at specific periodic intervals rather than continuously across all slots. The network configures monitoring occasions with defined periodicity, allowing the UE to enter micro-sleep periods between monitoring occasions, thus reducing power consumption while maintaining scheduling flexibility through configured periodic monitoring
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically switch between active monitoring states and micro-sleep states based on the configured monitoring occasions. The UE adapts its operational state according to the periodic monitoring pattern, transitioning from continuous monitoring to selective monitoring at configured intervals, thereby optimizing power consumption while preserving scheduling capabilities
2Reliability
If continuous PDCCH monitoring is performed across all slots, then reliability of data reception is improved, but power saving performance deteriorates
Solution Approach 1:
The patent applies periodic action by establishing regular monitoring occasions where the UE monitors PDCCH at configured intervals rather than continuously. This periodic monitoring pattern ensures reliable data reception at critical moments while allowing the UE to enter low-power micro-sleep periods between monitoring occasions, thus achieving both reliability and power saving
Solution Approach 2:
The patent extracts unnecessary continuous monitoring operations and removes them from the UE's operational routine. By taking out the redundant monitoring activities between configured monitoring occasions, the UE eliminates wasted energy consumption while maintaining reliable data reception through focused monitoring at essential intervals
3Use of energy by moving object
If micro sleep periods are introduced after PDCCH reception, then power consumption is reduced, but scheduling responsiveness may worsen
Solution Approach 1:
The patent applies periodic action by configuring monitoring occasions with appropriate periodicity that balances power saving and responsiveness. The network configures the periodic interval to ensure the UE wakes up at timely moments to receive scheduling assignments, preventing excessive delays while still allowing micro-sleep periods for power conservation
Solution Approach 2:
The patent implements preliminary action by having the network pre-configure monitoring occasions and slot offsets before data transmission. This allows the UE to know in advance when to wake up and monitor PDCCH, ensuring timely responsiveness to scheduling assignments while optimizing micro-sleep timing for maximum power saving
Data Source
AI summary
The present specification provides a method, performed by a terminal in a wireless communication system, for receiving a minimum slot offset, the method being characterized in that: the minimum slot offset is received from a base station, and is associated with the expectation that a terminal will receive a physical downlink shared channel (PDSCH) on the basis of at least one slot offset having a value equal to or greater than the minimum slot offset; and a physical downlink control channel (PDCCH) is monitored on at least one search space set, on the basis of the minimum slot offset.