NR Beam Sweeping Reception Timing for Low-Power UE Control
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Solution Overview
Problem
The multi-beamforming in the NR system leads to increased power consumption and reduced efficiency due to unnecessary reception and transmission of downlink and uplink control channels during beam sweeping, narrower beam coverage causing communication disconnections, and inefficient Ack/Nack feedback schemes.
Innovation Solution
A communication system where a base station device notifies a communication terminal device of optimal reception timings, allowing the terminal to synchronize its operations and reduce power consumption while maintaining communication quality and resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam sweeping is performed with multiple beams to cover necessary coverage, then coverage area is improved, but power consumption increases due to unnecessary reception and transmission of control channels
Solution Approach 1:
The base station notifies the communication terminal in advance of the optimal reception timing for downlink control channels during beam sweeping. This preliminary notification allows the terminal to synchronize its reception operations only at the optimal timing rather than continuously monitoring all beam timings, thereby reducing power consumption while maintaining coverage area
Solution Approach 2:
The system dynamically adjusts the reception timing based on beam sweeping progress. The base station determines optimal reception timings that change as beams sweep through different directions, and notifies the terminal of these dynamic timings. This allows the terminal to adapt its reception operations to the current beam direction, reducing unnecessary power consumption while maintaining effective coverage
2Area of stationary object
If beam sweeping is performed with multiple beams, then coverage area is improved, but communication disconnections occur due to narrower beam coverage
Solution Approach 1:
The base station notifies the communication terminal in advance of the optimal reception timing before beam switching occurs. This preliminary timing information allows the terminal to prepare for and synchronize with the upcoming beam direction change, ensuring continuous communication without disconnections during beam sweeping transitions
3Reliability
If the terminal receives downlink control channels at every subframe, then communication reliability is maintained, but power consumption increases unnecessarily
Solution Approach 1:
The base station provides feedback information in the form of notifications containing optimal reception timing details to the communication terminal. This feedback mechanism allows the terminal to adjust its reception behavior to only monitor control channels at the optimal timing determined by the base station, maintaining communication reliability while significantly reducing power consumption by avoiding unnecessary reception operations at non-optimal times
Data Source
AI summary
Provided is a communication system capable of suppressing increase in the power consumption of a communication terminal device, degradation in the communication quality, and reduction in the use efficiency of radio resources. A base station device (gNB) notifies a communication terminal device (UE) of information on the next reception timing. The UE receives, for example, a downlink control signal in a subframe. The UE obtains, from the downlink control signal, information on a piece of user data in the subframe, and the information on the next reception timing. The UE transmits and receives the piece of user data to and from the gNB. The information on the next reception timing indicates a subframe as the next reception timing of the UE. The UE receives a downlink control signal in the subframe.