Uplink Transmission Formats for 5G NR Data Rates
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G New Radio (NR), face challenges in enhancing uplink transmissions to meet increasing demands for higher data rates, capacity, spectral efficiency, and lower latency.
Innovation Solution
The proposed solution involves techniques for one-symbol or two-symbol uplink transmissions, where a one-symbol or two-symbol uplink signal can carry control information, using different formats such as Format 0 and Format 2, and employing sequence-based or frequency division multiplexing (FDM)-based designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional uplink transmission methods are used, then system compatibility is maintained, but data rates and spectral efficiency are insufficient
Solution Approach 1:
The uplink transmission is segmented into two distinct formats: Format 0 for 1-symbol transmissions and Format 2 for 2-symbol transmissions. Each format is optimized for specific use cases, allowing the system to achieve higher data rates when needed while maintaining compatibility with existing single-format systems. The segmentation enables selective application of advanced techniques without requiring universal adoption.
Solution Approach 2:
The system dynamically selects between Format 0 and Format 2 based on channel conditions, traffic requirements, and latency constraints. This dynamic adaptation allows the system to optimize for high data rates using Format 2 when conditions permit, while falling back to Format 0 for compatibility or when lower rates suffice, thereby resolving the contradiction between productivity and adaptability.
2Productivity
If more symbols are used for uplink transmission, then data throughput increases, but transmission latency increases
Solution Approach 1:
The patent applies partial action by using only 1 or 2 symbols for uplink transmission instead of the conventional longer durations. Format 0 uses exactly 1 symbol, while Format 2 uses 2 symbols, providing just enough transmission time to achieve acceptable throughput while minimizing latency. This partial action approach sacrifices some maximum throughput potential in exchange for significantly reduced transmission time, resolving the contradiction between productivity and time loss.
3Device complexity
If sequence-based designs are used, then implementation complexity is reduced, but spectral efficiency is limited
Solution Approach 1:
The system changes the modulation parameter from traditional QPSK to 64-QAM for Format 2 transmissions. This parameter change increases spectral efficiency by 4x compared to QPSK, allowing more data to be transmitted in the same time-frequency resources. The patent carefully manages the complexity increase from higher-order modulation by using it selectively in Format 2 rather than universally, thus resolving the contradiction between device complexity and spectral efficiency.
4Productivity
If 2-symbol Format 2 is used, then spectral efficiency increases, but device complexity increases
Solution Approach 1:
The patent designs Format 2 to serve multiple functions simultaneously: it provides high spectral efficiency through 64-QAM modulation, supports both uplink data and control information transmission, and maintains backward compatibility through proper signaling. This multi-functionality justifies the increased device complexity by delivering comprehensive performance improvements across multiple dimensions, resolving the contradiction between productivity and device complexity.
Data Source
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AI summary
Various aspects described herein relate to techniques for uplink transmissions in wireless communication systems. In an aspect, a method includes receiving, by a user equipment (UE), hopping information for two consecutive symbols, generating, by the UE, a first symbol of the two consecutive symbols using a format, generating, by the UE, a second symbol of the two consecutive symbols based on the format and the hopping information, and transmitting, by the UE, the two consecutive symbols in an uplink signal.