User Equipment Antenna Phase Control for 5G Codebook Selection
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Solution Overview
Problem
In future radio communication systems, such as 5G, sharing sufficient information on antenna configurations between user terminals and base stations is challenging due to increased variations in antenna configurations, which hinders improvement in transmission quality.
Innovation Solution
A user terminal with multiple antennas and a control section that notifies the base station of specific information regarding array patterns and coherence among antennas, allowing for appropriate codebook selection based on antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to four or more, then the data rate and communication capability are improved, but the variations in antenna configuration increase making information sharing difficult
Solution Approach 1:
The patent segments antenna configurations into distinct types (Type 1 and Type 2) based on coherence relationships. Type 1 represents configurations where all antennas are coherent, while Type 2 represents configurations where only some antennas are coherent. This segmentation allows the system to manage complexity by categorizing rather than individually specifying each possible antenna configuration, enabling efficient information sharing while supporting four or more antennas for improved data rate.
2Reliability
If information on antenna configuration is not sufficiently shared, then device complexity is reduced, but transmission quality deteriorates
Solution Approach 1:
The patent changes the parameter representation from detailed individual antenna configuration data to simplified type indicators (Type 1 or Type 2). The control section determines which type applies and notifies the base station of this type indicator. This parameter change enables sufficient information sharing for maintaining transmission quality while reducing information loss, as the type classification captures the essential coherence relationships needed for accurate codebook selection without requiring exhaustive configuration details.
3Measurement precision
If detailed antenna configuration information is shared, then codebook selection accuracy is improved, but device complexity and information overhead increase
Solution Approach 1:
The patent extracts the essential characteristic from detailed antenna configuration information - specifically, the coherence relationship pattern - and represents it through type indicators (Type 1 or Type 2). The control section identifies which type applies based on the actual antenna configuration and transmits only this extracted type information to the base station. This extraction approach maintains codebook selection accuracy by preserving the critical coherence relationship information while eliminating unnecessary detailed configuration data, thereby reducing information sharing complexity.
Data Source
AI summary
A user terminal includes: a transmission section including a plurality of antennas; and a control section that controls the phase of a signal transmitted from the plurality of antennas to a base station. The control section performs control such that any one of first information and second information is notified to the base station, the first information is information indicating any of a plurality of array patterns that are adoptable by each antenna in a case where the plurality of antennas are all coherent, and the second information is information indicating the number of the coherent antennas in a case where at least two of the plurality of antennas are coherent.