URLLC Transmission Units in C-V2X Subframes
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Solution Overview
Problem
Regular subframe transmission in distributed C-V2X environments is not sufficiently reliable for URLLC data and does not provide low enough latency, necessitating improved methods for transmitting URLLC data.
Innovation Solution
The implementation of URLLC transmission units within regular subframes, where a URLLC control channel and data portion are configured and inserted into punctured OFDM symbols, allowing for higher power spectrum density and random subchannel selection to enhance reliability and reduce latency, with a URLLC TTI that is a portion of the regular TTI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular subframe transmission is used in distributed C-V2X environment, then device complexity is reduced and ease of operation is maintained, but reliability is insufficient and latency is too high for URLLC requirements
Solution Approach 1:
The patent segments the regular subframe transmission structure by introducing distinct URLLC transmission units with separate control channels and data portions. This segmentation allows URLLC traffic to be handled independently from regular traffic, enabling reliable low-latency transmission while maintaining the overall regular subframe structure for other traffic types.
Solution Approach 2:
The patent implements dynamic configuration of URLLC transmission units within regular subframes, where the network can adaptively allocate resources and adjust transmission parameters based on URLLC traffic demands. This dynamic approach enables the system to maintain reliability for URLLC while preserving flexibility and ease of operation for overall system management.
2Loss of time
If URLLC transmission units are configured within regular subframes, then latency is reduced and reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs preliminary configuration of URLLC transmission units where the network pre-allocates resources and configures transmission parameters in advance. This allows URLLC data to be transmitted immediately when available without waiting for regular scheduling decisions, significantly reducing latency while the configuration complexity is managed through pre-planning.
Solution Approach 2:
The patent nests URLLC transmission units within the existing regular subframe structure. The URLLC control channel and data portion are embedded as specific elements within the broader subframe framework, allowing efficient utilization of existing time-frequency resources. This nesting approach reduces latency by eliminating separate transmission opportunities while managing complexity through hierarchical resource organization.
3Reliability
If higher power spectrum density is used for URLLC transmission, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality enhancement by concentrating higher power spectrum density specifically on URLLC transmission units rather than uniformly across all transmissions. The network dynamically adjusts power allocation to apply enhanced power only when and where URLLC traffic requires it, improving reliability for critical communications while minimizing overall energy consumption by maintaining normal power levels for non-URLLC traffic.
Data Source
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AI summary
A method, apparatus, and computer-readable medium at a transmitting user equipment (UE) in a distributed cellular vehicle-to-everything environment are disclosed to achieve communications between the distributed UEs with high reliability and low latency. A transmitting UE can configure an ultra-reliable low-latency communication (URLLC) transmission unit by configuring a URLLC channel indicator, a URLLC transmission indicator, a URLLC control channel, and URLLC data portion. The UE can transmit the configured URLLC transmission unit in punctured OFDM symbols within a regular subframe to a receiving UE in the distributed C-V2X environment.