UE-Specific Scheduling Request Repetition for Reliable Low-Latency Uplink
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting scheduling requests (SRs) for uplink transmissions, particularly in high reliability and low latency scenarios like ultra-reliable low latency communications (URLLC), where frequent SR transmissions are needed to mitigate missed detections and reduce latency.
Innovation Solution
Implementing UE-specific SR repetition configurations based on channel conditions, traffic priority, link budget, latency requirements, and historical performance, allowing UEs to repeatedly transmit SRs until acknowledged by the base station, with power adjustments and resource allocation tailored to individual UE needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SR transmissions are transmitted more frequently to reduce latency and improve reliability in URLLC scenarios, then SR reliability and latency performance are improved, but system resource consumption and interference increase
Solution Approach 1:
The patent implements UE-specific SR repetition configurations where each UE receives individualized parameters including repetition count, periodicity, and power adjustments tailored to its specific channel conditions, traffic priority, and latency requirements. This localized configuration allows UEs with poor channel conditions or high priority traffic to transmit more frequent repetitions while UEs with good conditions consume fewer resources, resolving the contradiction between reliability improvement and resource consumption.
Solution Approach 2:
The base station dynamically adjusts SR transmission parameters including repetition count, periodicity, time-frequency resources, and power levels based on UE-specific conditions such as channel quality, traffic priority, and latency requirements. This parameter adaptation enables the system to optimize SR reliability for each UE while preventing excessive resource consumption by adjusting parameters downward for UEs with good channel conditions or low priority traffic.
2Reliability
If UE-specific SR repetition configurations are implemented with power adjustments and resource allocation, then SR transmission reliability is improved, but device complexity and configuration overhead increase
Solution Approach 1:
The base station pre-configures SR repetition parameters for each UE based on their specific requirements before SR transmissions begin. This preliminary configuration includes setting repetition counts, periodicities, and power adjustments according to UE channel conditions and traffic priorities, eliminating the need for complex real-time negotiations and reducing configuration overhead during actual SR transmissions.
Solution Approach 2:
The system implements feedback mechanisms where UEs report their channel conditions, traffic priorities, and latency requirements to the base station. The base station uses this feedback to automatically determine appropriate SR repetition configurations, reducing the complexity of manual configuration and enabling adaptive optimization without requiring complex device-side decision-making logic.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A base station and a user equipment (UE) may communicate in a high reliability and low latency communications system (e.g., ultra-reliable low latency communications (URLLC)). The base station may signal a UE-specific scheduling request (SR) repetition configuration that the UE may utilize to transmit an instantaneous SR when a buffer status report (BSR) is triggered by a new data packet. The UE may repeatedly transmit the SR until a number of repetitions or a time period of repetitions is met or an uplink grant is received from the base station. The SR repetition configuration may include a number of parameters including a repetition setting, power settings, a resource allocation, and an acknowledgement/negative acknowledgment (ACK/NACK) procedure.