Uplink Power Splitting for Multi-RF Chain User Equipment
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Solution Overview
Problem
User equipment (UE) in wireless communications systems is limited by the constraint of using the same transmission power across multiple radio frequency (RF) chains with different power capabilities, restricting the maximum transmission power and limiting the transmission power gain.
Innovation Solution
The UE is configured to perform unequal transmission power splitting across RF chains, allowing different transmission powers for each chain based on their individual capabilities, enabling a higher overall transmission power without exceeding specific absorption rate (SAR) and maximum permissible exposure (MPE) constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the UE uses multiple PAs with different transmission power capabilities, then the UE can attain higher transmission powers, but the UE is precluded from applying different transmission powers to different PAs, which constrains the maximum transmission power
Solution Approach 1:
The patent applies local quality by enabling different transmission powers for different RF chains based on their individual power capabilities. Each RF chain is configured with a power level appropriate to its capabilities, allowing the system to optimize performance for each component rather than treating all chains uniformly. This resolves the contradiction by allowing higher transmission power (improving_feature) while simultaneously providing adaptability in power allocation (worsening_feature).
Solution Approach 2:
The patent implements dynamics through configurable power splitting ratios that can be adjusted based on channel conditions, power capabilities, and system requirements. The power allocation is not fixed but can be dynamically adapted, allowing the system to optimize transmission power while maintaining flexibility in power distribution across different RF chains.
2Ease of operation
If the UE applies equal transmission power to all RF chains, then the system is simple to implement, but the maximum transmission power is constrained by the least capable chain
Solution Approach 1:
The patent enables each RF chain to operate at its optimal power level rather than being constrained to a uniform power level. This allows the system to achieve higher maximum transmission power by utilizing the full capability of each chain individually, while the configuration remains manageable through standardized power splitting mechanisms.
3Power
If the UE uses unequal transmission powers across RF chains, then the transmission power gain is enhanced, but the system complexity increases due to power splitting configuration
Solution Approach 1:
The patent utilizes parameter changes by configuring power splitting ratios as adjustable parameters that can be modified based on system conditions. This allows the system to achieve enhanced transmission power gain through unequal power distribution while managing complexity through parameter-based control rather than complex hardware modifications.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select an uplink transmission power sharing configuration to use for transmission of one or more uplink messages. The uplink transmission power sharing configuration may be based on a first uplink transmission power capability of a first radio frequency (RF) chain of the UE and on a second uplink transmission power capability of a second RF chain of the UE. The UE may transmit the one or more uplink messages to a network entity in accordance with the uplink transmission power sharing configuration. Specifically, the UE may transmit the one or more uplink messages via the first RF chain using a first transmission power, and may transmit the one or more uplink messages via the second RF chain using a second transmission power that is different from the first transmission power.