Sidelink Redundancy Version Selection Under Congestion and NACK Conditions
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Solution Overview
Problem
Existing wireless communication systems face ambiguity and inefficiency in redundancy version selection for sidelink communications, leading to increased latency and reduced reliability and throughput.
Innovation Solution
A transmitting UE selects a redundancy version from a set of self-decodable redundancy versions based on conditions such as system congestion, NACKs, feedback enablement, slot resources, code rate, transmission priority, and resource pool configuration to enhance reliability and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitting UE uses random or default redundancy version selection for sidelink transmissions, then the system operation is simple, but the reliability and throughput of wireless communications are reduced
Solution Approach 1:
The patent implements dynamic redundancy version selection where the transmitting UE adapts the RV selection strategy based on real-time channel conditions, congestion levels, and transmission parameters. The system transitions from static random selection to dynamic condition-based selection, improving reliability without requiring complex manual configuration
Solution Approach 2:
The patent changes the parameter selection approach by using multiple sets of redundancy versions with different characteristics (e.g., different code rates, self-decodable properties) and selecting the appropriate set based on transmission conditions. This allows the system to optimize for reliability when needed while maintaining simpler operation under different conditions
2Productivity
If a transmitting UE monitors multiple conditions and selects from multiple sets of redundancy versions, then the reliability and throughput are improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the redundancy version selection process into multiple independent sets, each optimized for specific transmission conditions. The UE monitors relevant conditions and selects the appropriate pre-configured set, avoiding the need for complex real-time optimization calculations while improving throughput
Solution Approach 2:
The system performs preliminary configuration of multiple redundancy version sets with different characteristics before actual transmissions. This pre-processing allows the UE to make faster selection decisions during operation by simply matching current conditions to pre-evaluated sets, reducing real-time processing complexity
3Reliability
If self-decodable redundancy versions with high code rate are used, then the reliability of individual transmissions is improved, but the system resources and throughput may be reduced under certain conditions
Solution Approach 1:
The patent dynamically selects between self-decodable redundancy versions with high code rates and other redundancy version types based on transmission conditions. When channel conditions are poor or reliability is critical, self-decodable versions are used; when conditions are good or resources are constrained, other versions optimized for throughput are selected
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive information indicative of one or more sets of redundancy version available for sidelink communications. Each set of redundancy versions may be associated with one or more conditions for use of a respective set. The UE may determine that one or more conditions for a first set of the one or more sets of redundancy versions are satisfied. The UE may select the first set for transmission of a sidelink message based on the satisfaction of the one or more conditions associated with the first set. The UE may transmit the sidelink message to a second UE using a redundancy version included within the first set of redundancy versions.