UE Transmission Mode Selection for URLLC Reliability and Latency
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Solution Overview
Problem
Existing 5G communication systems face challenges in adapting to varying communication requirements such as packet sizes, error rates, and communication qualities, particularly in supporting Ultra Reliable and Low Latency Communications (URLLC) with guaranteed packet arrival rates and low latency.
Innovation Solution
User equipment determines and notifies a base station apparatus of a transmission mode from predefined modes based on multiple conditions, including packet size, error rate, and delay, allowing for flexible communication adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmission mode is configured based on UE capability, then device complexity is reduced, but adaptability to different communication conditions deteriorates
Solution Approach 1:
The patent implements dynamic transmission mode selection where the UE determines appropriate transmission modes based on real-time communication conditions such as packet size, error rate requirements, and delay constraints. This allows the system to adapt to varying URLLC requirements rather than using a fixed configuration, resolving the contradiction between adaptability and complexity by making the selection process condition-based rather than capability-based only
Solution Approach 2:
The patent changes the selection criteria from static UE capability parameters to dynamic communication condition parameters including packet size, error rate, and delay requirements. This parameter transformation enables the system to select from multiple transmission modes (e.g., repetition, packet duplication, HARQ) based on actual communication needs, improving adaptability without significantly increasing device complexity
2Reliability
If multiple transmission modes are supported for different communication conditions, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission mode selection process into distinct communication condition categories (packet size, error rate requirements, delay constraints). Each segment corresponds to specific transmission modes suited for those conditions, such as using repetition for small packets with high reliability requirements or packet duplication for low latency scenarios. This segmentation improves reliability by matching modes to conditions while managing complexity through structured classification
Solution Approach 2:
The patent performs preliminary determination of transmission modes based on pre-defined communication conditions and requirements. The UE evaluates communication conditions beforehand and selects appropriate transmission modes in advance, rather than adapting during transmission. This preliminary action ensures reliable communication by pre-matching modes to conditions while reducing real-time decision complexity
3Adaptability or versatility
If transmission mode is determined based on communication conditions, then communication adaptability is improved, but processing time increases
Solution Approach 1:
The patent performs transmission mode determination as a preliminary action before actual data transmission. The UE evaluates communication conditions (packet size, error rate, delay requirements) and selects appropriate transmission modes in advance. This preliminary determination allows the system to adapt to different communication conditions while minimizing real-time processing delays during actual data transmission
Solution Approach 2:
The patent applies different transmission mode selection strategies based on local communication conditions such as packet size categories, error rate requirements, and delay constraints. Each local condition scenario has optimized transmission mode choices, allowing rapid determination without exhaustive evaluation of all possible modes, thus improving adaptability while reducing determination time
Data Source
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AI summary
User equipment includes a control unit that determines one transmission mode to be applied to communication from a plurality of predefined transmission modes on a basis of a plurality of conditions required for the communication, a transmitting unit that notifies a base station apparatus of the transmission mode, and a receiving unit that receives a downlink signal to which a transmission parameter associated with the transmission mode is applied.