Adaptive Autonomous Uplink Configuration for Low-Latency Wireless
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Solution Overview
Problem
Current wireless communication systems face delays in uplink transmissions due to the need for base stations to schedule and grant access in shared spectra, leading to inefficiencies in autonomous uplink communications, especially in dynamic and time-varying radio link conditions.
Innovation Solution
Implementing adaptive autonomous uplink communications where user equipment dynamically adjusts transmission parameters based on link adaptation parameters, such as channel measurements and traffic load, without relying on explicit grants from the base station, using configurations that include modulation coding schemes, rank indicators, and resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations schedule and allocate resources for uplink transmissions in shared spectra, then collision avoidance is achieved, but transmission delays increase
Solution Approach 1:
The base station pre-configures autonomous uplink transmission parameters including modulation coding schemes, rank indicators, and resource allocations before the UE needs to transmit. This preliminary configuration enables the UE to immediately begin autonomous transmissions without waiting for scheduling grants, thus reducing transmission delays while maintaining collision avoidance through pre-planned resource allocation
Solution Approach 2:
The user equipment is empowered to autonomously select and apply transmission parameters from the pre-configured set based on current channel conditions and traffic requirements, without requiring continuous base station intervention. This self-service capability eliminates grant-based transmission delays while the pre-configured resource allocations ensure collision-free operations in shared spectra
2Loss of time
If autonomous uplink communications are implemented without base station grants, then transmission delays are reduced, but performance is limited due to static configurations
Solution Approach 1:
The patent introduces dynamic adaptation mechanisms where the base station updates autonomous uplink transmission configurations based on observed channel conditions, traffic patterns, and performance metrics. These updates occur at optimized time scales, allowing the system to maintain the low-latency benefits of autonomous transmission while progressively improving performance through adaptive reconfiguration of modulation schemes, resource allocations, and other transmission parameters
3Device complexity
If autonomous uplink transmissions use static or slowly updated configurations, then device complexity is reduced, but adaptability to time-varying channel conditions deteriorates
Solution Approach 1:
Comprehensive transmission configurations including multiple modulation coding schemes, rank indicators, and resource allocations are pre-configured at the base station before autonomous transmission begins. This preliminary preparation enables the UE to quickly adapt to varying channel conditions by selecting from pre-evaluated parameter sets, maintaining low device complexity while achieving fast link adaptation
Solution Approach 2:
The system enables dynamic parameter changes by allowing the base station to update configuration parameters at optimized time scales based on channel conditions. The UE can switch between different pre-configured parameter sets (modulation schemes, coding rates, resource blocks) to adapt to time-varying channels, achieving versatility without requiring complex real-time optimization algorithms at the device level
Data Source
AI summary
Wireless communications systems and methods related to performing adaptive autonomous uplink (UL) communications are provided. A first wireless communication device receives, from a second wireless communication device, an autonomous uplink transmission configuration. The first wireless communication device determines a transmission parameter in response to a link adaptation parameter based on the autonomous uplink transmission configuration. The first wireless communication device transmits, to the second wireless communication device, an autonomous uplink communication signal based on the determined transmission parameter.