Repetition-Based Uplink for Low Latency Wireless
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Solution Overview
Problem
Current wireless communication systems face challenges in maintaining low latency communications, especially during instances of insufficient uplink coverage, as they do not efficiently reconfigure uplink transmission time intervals (TTIs) to ensure successful data and control information reception.
Innovation Solution
The implementation of repetition-based uplink communications, where user equipment (UE) receives activation messages from the network with transmission parameters indicating duration and uplink sTTI patterns, allowing for repetitive transmissions on the uplink channel to enhance coverage and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitive transmissions are enabled on uplink channel to improve coverage, then reliability is improved, but latency increases
Solution Approach 1:
The system dynamically configures the number of repetitive transmissions based on uplink coverage conditions. When coverage is sufficient, fewer repetitions are used to minimize latency. When coverage is insufficient, more repetitions are activated to ensure reliable delivery. This dynamic adaptation resolves the contradiction by adjusting the reliability-latency tradeoff in real-time based on actual channel conditions.
Solution Approach 2:
The patent changes the transmission parameter (number of repetitions) based on coverage assessment. By modifying this parameter, the system can improve reliability when needed while maintaining low latency when coverage is adequate. The network entity determines coverage conditions and adjusts the repetition count accordingly, allowing the system to optimize both reliability and latency performance.
2Reliability
If uplink TTI is extended to ensure successful reception, then reliability is improved, but latency increases
Solution Approach 1:
The patent segments the uplink transmission into multiple shorter sTTI units rather than using one extended TTI. Each sTTI can be independently received and processed, allowing the system to achieve reliable reception through multiple opportunities while maintaining low individual transmission durations. This segmentation enables the system to improve reliability without proportionally increasing latency.
Solution Approach 2:
The system employs periodic repetitive transmissions at configured intervals rather than extending a single TTI duration. This periodic approach allows the network to receive multiple transmission attempts over time, improving reception success probability while maintaining low latency through the use of shortened TTI intervals between repetitions.
3Productivity
If multiple consecutive sTTIs are used for data transmission, then productivity is improved, but device complexity increases
Solution Approach 1:
The network entity performs preliminary configuration by determining and signaling the sTTI pattern and number of repetitions to the UE before data transmission begins. This preliminary action simplifies the UE's task, as it only needs to follow the pre-configured pattern rather than making complex decisions in real-time. The UE complexity is reduced while maintaining high productivity through efficient use of multiple sTTIs.
Solution Approach 2:
The system employs feedback mechanisms where the network assesses uplink coverage conditions and adjusts the sTTI configuration accordingly. This feedback loop allows the network to optimize productivity by configuring appropriate repetition counts based on actual channel conditions, while keeping UE complexity manageable through centralized control and pre-configured parameters.
Data Source
AI summary
A method and apparatus for enabling repetitive transmissions for low latency systems is disclosed. For example, a base station may determine whether an uplink coverage parameter for a UE communicating with the network entity on an uplink communication channel satisfies an uplink coverage threshold, and transmit an activation message for repetition-based uplink communications to the UE based on a determination that the uplink coverage parameter for the UE communicating with the network entity on the uplink communication channel satisfies the uplink coverage threshold. Further, a UE may receive an activation message for repetition-based uplink communications from a network entity, and perform repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.