Scheduling Ultra-Reliable Low Latency Communications via Layer Indicator
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G New Radio, face challenges in achieving ultra-reliable low latency communications due to conservative block error rate thresholds that compromise spectral efficiency, leading to reduced reliability and increased latency.
Innovation Solution
The system employs a layer indicator to determine the strongest layer for data communication, using a less conservative block error rate threshold of 10^-1 instead of 10^-5, allowing for greater spectral efficiency while maintaining lower actual block error rates, and configures user equipment to report channel state information based on both thresholds for optimal scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conservative block error rate threshold of 10^-5 is used for scheduling, then reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The system dynamically selects between two different block error rate thresholds (10^-1 and 10^-5) based on the service category and channel conditions. For enhanced mobile broadband services, a less conservative threshold of 10^-1 is used to maximize spectral efficiency, while for ultra-reliable low latency communications, a more conservative threshold of 10^-5 is applied. This dynamic adaptation allows the system to optimize the trade-off between reliability and spectral efficiency for different service requirements.
Solution Approach 2:
The invention changes the block error rate threshold parameter from a fixed conservative value (10^-5) to a variable parameter that can take different values (10^-1 or 10^-5) depending on the service category and channel state information. This parameter change enables the system to achieve higher spectral efficiency for eMBB services while maintaining appropriate reliability levels for URLLC services.
2Productivity
If a less conservative block error rate threshold of 10^-1 is used, then spectral efficiency is improved, but reliability deteriorates
Solution Approach 1:
The system changes the block error rate threshold parameter from 10^-5 to 10^-1 for enhanced mobile broadband services, enabling higher spectral efficiency. This parameter change is compensated by using layer indicators and channel state information to select the strongest transmission layers, ensuring that reliability is maintained through spatial diversity while achieving improved spectral efficiency.
Solution Approach 2:
The invention introduces a new dimension for reliability assurance by using layer indicators and spatial multiplexing. Instead of relying solely on a conservative block error rate threshold, the system uses multiple transmission layers and selects the strongest layers based on channel state information. This dimensional approach allows the system to use a less conservative threshold (10^-1) while maintaining reliability through spatial diversity.
3Reliability
If conservative scheduling parameters are used, then reliability is improved, but latency increases due to re-transmissions
Solution Approach 1:
The system performs preliminary selection of the strongest transmission layers based on layer indicators and channel state information before data transmission. By pre-identifying the most reliable spatial paths and configuring the scheduling parameters accordingly, the system reduces the need for re-transmissions and minimizes latency while maintaining high reliability for ultra-reliable low latency communications.
Data Source
AI summary
The described technology is generally directed towards ultra-reliable low latency communications between a network device and a user equipment, using scheduling parameters for a less conservative block error rate threshold based on the spectral efficiency. A network device obtains channel state information comprising a rank indicator, a layer indicator indicating a strongest layer, a first channel quality indicator corresponding to a first coding rate and a first modulation value for a first conservative block error rate threshold value, and a second channel quality indicator corresponding to a second coding rate and second modulation value for a second conservative block error rate threshold value. When the network device determines that that the first coding rate and the first modulation value are suitable for ultra-reliable low latency communications, the network device schedules the user equipment to use the first coding rate and the first modulation value, e.g., using the strongest layer.