User Terminal Codebook Control for Full-Power Uplink
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Solution Overview
Problem
In next-generation radio communication systems like NR, UEs face challenges with codebook-based transmission when using multiple antenna ports, leading to reduced transmission power and decreased coverage due to the use of non-full rated Power Amplifiers (PAs), which suppresses communication throughput.
Innovation Solution
A user terminal is designed with a control section that assumes full power transmission when capable, using a fully coherent codebook subset for uplink transmission based on downlink control information, and applies Cyclic Delay Diversity to ensure full power transmission even with non-coherent or partially coherent UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If non-coherent or partial and non-coherent codebook subsets are used for codebook-based transmission with multiple antenna ports, then transmission power is reduced and full power transmission cannot be performed, but coverage decreases and communication throughput increases
Solution Approach 1:
The patent changes the codebook subset parameter from non-coherent or partial and non-coherent to fully coherent, which enables the power amplifier to operate at full rated power. This parameter change resolves the contradiction by allowing full power transmission while maintaining multiple antenna port usage, thereby preserving both transmission power and coverage
2Power
If non-coherent or partial and non-coherent codebook subsets are used for codebook-based transmission with multiple antenna ports, then transmission power is reduced and full power transmission cannot be performed, but communication throughput is suppressed
Solution Approach 1:
By changing the codebook subset parameter to fully coherent, the system enables full power transmission which directly improves communication throughput. The fully coherent codebook subset allows the power amplifier to operate at maximum capacity, resolving the contradiction between transmission power and productivity
3Device complexity
If a Power Amplifier that is not a full rated PA is used, then device complexity is reduced and cost decreases, but full power transmission cannot be performed and coverage decreases
Solution Approach 1:
The patent changes the operational parameter of the Power Amplifier from non-full rated mode to full rated mode by using the fully coherent codebook subset. This allows even non-full rated PAs to achieve full power transmission capability, resolving the contradiction between device complexity and coverage without requiring expensive full rated PA hardware
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes: a control section that, when capability information that indicates that full power transmission is supported is transmitted, and when a non coherent or partial and non coherent codebook subsets are configured, assumes that downlink control information can indicate a fully coherent codebook subset; and a transmitting section that performs the full power transmission by applying the fully coherent codebook subset to uplink transmission based on the downlink control information. According to one aspect of the present disclosure, it is possible to appropriately control full power transmission.