UE Downlink Control Channel Reception Timing in 5G Unlicensed Bands
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Solution Overview
Problem
In 5G wireless communication systems, especially in unlicensed bands, UE frequently receives downlink control information, leading to unnecessary power consumption and performance degradation due to the need to constantly determine uplink/downlink resource allocation, even when the unlicensed band is idle.
Innovation Solution
A method where the UE receives configuration for downlink control information reception times or periods from the base station, allowing it to adjust and minimize unnecessary receptions by monitoring the downlink control channel based on specific periods, and the base station transmits control information only when the unlicensed band is idle, using channel access procedures to determine occupancy intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE frequently receives downlink control information in unlicensed bands, then the UE can quickly determine uplink/downlink resource allocation, but the UE experiences unnecessary power consumption and performance degradation
Solution Approach 1:
The base station configures the UE with specific reception periods for downlink control information in unlicensed bands. Instead of continuous monitoring, the UE only needs to monitor during configured periodic intervals, which significantly reduces power consumption while maintaining the ability to quickly determine resource allocation when needed
Solution Approach 2:
The system dynamically adjusts the reception configuration based on channel conditions and traffic requirements. The base station can modify reception periods and occasions adaptively, allowing the UE to balance between power saving and timely resource allocation determination based on current network conditions
2Loss of information
If the base station transmits downlink control information continuously, then the UE can always have up-to-date resource allocation information, but unnecessary transmissions occur when the unlicensed band is idle
Solution Approach 1:
The system implements feedback mechanisms where the base station monitors channel conditions and UE reception status, then adjusts downlink control information transmission timing accordingly. When the unlicensed band is idle, the base station can skip transmissions or extend existing occupancy intervals, reducing energy waste while maintaining information freshness through configured periodic updates
Solution Approach 2:
The base station performs channel access procedures and determines occupancy intervals in advance, then configures UE reception occasions based on these predetermined intervals. This preliminary planning allows the system to avoid unnecessary transmissions while ensuring UEs are ready to receive information when the channel is actually occupied
Data Source
AI summary
Disclosed are a communication technique for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security, and safety-related services) on the basis of 5G communication technology and IoT-related technology. The present invention relates to a method and an apparatus for receiving a downlink control channel in a wireless communication system. Particularly, the present invention provides a method and an apparatus allowing a terminal to vary, according to base station settings or instructions, a reception time or reception timing, for a downlink control channel, transmitted from a base station.