Dynamic Modulation Selection for PUCCH Payload Optimization
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Solution Overview
Problem
Current modulation techniques for wireless communication networks, such as pi/2 BPSK and QPSK, do not consistently offer advantages across all payload sizes for the Physical Uplink Control Channel (PUCCH) in New Radio (NR) standards, with pi/2 BPSK being better for small payloads and QPSK for larger payloads due to differences in coding rate and Peak to Average Power Ratio (PAPR) effects.
Innovation Solution
Selecting between pi/2 BPSK and QPSK modulation techniques based on characteristics like coding rate, payload size, bandwidth, and number of modulation symbols to optimize performance, with thresholds potentially fixed or signaled for dynamic switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If pi/2 BPSK modulation is used, then PAPR is reduced and power amplifier efficiency is improved, but payload size capability and coding gain are limited
Solution Approach 1:
The patent implements dynamic modulation selection that adapts between pi/2 BPSK and QPSK based on real-time channel conditions and payload requirements. The system dynamically switches modulation schemes to optimize both power efficiency and payload capacity, rather than being locked into a single modulation type.
Solution Approach 2:
The patent changes the modulation parameter (from pi/2 BPSK to QPSK) based on payload size thresholds and channel conditions. This parameter change allows the system to achieve higher payload sizes when needed while maintaining power efficiency when possible, directly resolving the contradiction between power amplifier efficiency and payload size capability.
2Quantity of substance
If QPSK modulation is used, then payload size capability and coding gain are improved, but PAPR increases and power amplifier efficiency decreases
Solution Approach 1:
The system dynamically selects QPSK only when payload size requirements or channel conditions warrant the trade-off, rather than using it unconditionally. This dynamic approach ensures QPSK's payload capacity benefits are realized only when necessary, minimizing unnecessary power efficiency losses.
Solution Approach 2:
The patent implements conditional parameter changes where modulation switches to QPSK based on specific thresholds (payload size, channel quality). This selective parameter change allows the system to achieve higher payload sizes when needed while avoiding QPSK's PAPR penalties when pi/2 BPSK would suffice.
3Device complexity
If fixed modulation technique is used, then device complexity is reduced, but adaptability to different payload sizes and channel conditions deteriorates
Solution Approach 1:
The patent implements a dynamic yet simple modulation selection mechanism based on payload size thresholds and basic channel quality indicators. This dynamic approach provides adaptability to different payload sizes and conditions while maintaining relatively low device complexity through straightforward decision logic.
Solution Approach 2:
The system changes modulation parameters based on observable conditions (payload size, channel quality) using predetermined thresholds. This approach achieves adaptability without complex real-time optimization, balancing versatility with manageable device complexity through rule-based parameter selection.
4Reliability
If modulation switching based on multiple parameters is implemented, then performance optimization is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent implements performance optimization through parameter changes (modulation selection) based on key observable parameters like payload size and channel quality. By focusing on these fundamental parameters with predetermined thresholds, the system achieves reliable performance optimization without excessive implementation complexity.
Solution Approach 2:
The dynamic modulation selection adapts to changing conditions while using relatively simple decision logic based on payload size thresholds and basic channel indicators. This dynamic approach improves performance optimization while keeping implementation difficulty manageable through straightforward switching criteria.
Data Source
AI summary
A modulation technique, such as for example either Pi/2 BPSK or QPSK, is selected for transmission, based on a characteristic of the data to be transmitted, or the physical channel over which it is to be transmitted. The data characteristic may be the coding rate, or characteristics indirectly related to the coding rate, such as the number of coded bits or number of uncoded bits (payload size). The physical channel characteristic may for example be the physical channel bandwidth, the physical channel length, a number of physical channel modulation symbols, a number of the physical channel resource elements used for the data to be transmitted, or a number of the physical channel modulation symbols carrying the data to be transmitted.