Uplink H-ARQ Process Assignment for Priority and Latency Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmissions, particularly in assigning and prioritizing automatic repeat request (ARQ)/hybrid automatic repeat request (H-ARQ) processes for enhanced uplink (EU) services, which affects coverage, throughput, and transmission latency.
Innovation Solution
The method involves configuring ARQ/H-ARQ processes in a wireless transmit/receive unit (WTRU) to manage data transmissions based on priority, using a pool of H-ARQ processes, a controller, and a transmission counter, allowing for preemption and re-initiation procedures to ensure successful data delivery by adjusting the number of transmissions and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple independent uplink transmissions are processed within a common time interval, then transmission throughput is improved, but transmission latency increases due to the need to manage multiple ARQ/H-ARQ processes
Solution Approach 1:
The patent segments the ARQ/H-ARQ process management by creating separate process pools for different priority levels (high priority and low priority). This segmentation allows independent management of transmissions at each priority level, enabling parallel processing without cross-priority interference, thus improving throughput while controlling latency through priority-based scheduling.
Solution Approach 2:
The patent implements dynamic ARQ process assignment where the system can flexibly allocate and release ARQ processes based on current transmission needs and priority requirements. The dynamic management includes assigning processes from appropriate pools, pre-empting low-priority processes when high-priority data arrives, and releasing completed processes back to pools, optimizing both throughput and latency响应.
2Reliability
If ARQ processes are assigned for retransmitting failed transmissions, then transmission reliability is improved, but device complexity increases due to process management overhead
Solution Approach 1:
The patent divides ARQ process management into separate pools for high and low priority transmissions. Each pool independently manages its ARQ processes, simplifying the control logic within each pool while maintaining overall system reliability through coordinated priority-based scheduling across pools.
Solution Approach 2:
The ARQ process assignment mechanism operates autonomously based on predefined priority rules and transmission status. The system automatically assigns processes from appropriate pools, monitors transmission outcomes, and releases processes back to pools without requiring complex external coordination, reducing management overhead while ensuring reliable retransmission.
3Adaptability or versatility
If a pool of H-ARQ processes is maintained for flexible assignment, then adaptability is improved, but loss of information increases due to potential process preemption and reassignment
Solution Approach 1:
The patent segments H-ARQ processes into priority-based pools with clear assignment rules. High-priority data receives dedicated process assignment, while low-priority data uses available processes from its pool or pre-empted processes from low-priority pool, maintaining data integrity through systematic process management and tracking.
Solution Approach 2:
The system implements feedback mechanisms to track ARQ process assignment status, transmission outcomes, and pool availability. This feedback enables the system to make informed decisions about process assignment, pre-emption, and release, ensuring that data integrity is maintained while maximizing the flexibility and utilization of available processes.
Data Source
AI summary
A method and apparatus for assigning automatic repeat request (ARQ)/hybrid-automatic repeat request (H-ARQ) processes in a wireless transmit/receive unit (WTRU) to support enhanced uplink (EU) data transmissions. After parameters associated with the ARQ/H-ARQ processes are configured, the WTRU assigns an ARQ/H-ARQ process for selected data. After transmitting the data, the WTRU determines whether feedback information for the data has been received. The WTRU releases the ARQ/H-ARQ process if an acknowledgement (ACK) message has been received, and retransmits the data if a non-acknowledgement (NACK) message or no feedback information has been received in a predetermined time period while incrementing a transmission counter in the WTRU. When an ARQ/H-ARQ transmission limit has been reached, the WTRU may discard the data or reinitiate the transmission. An ARQ/H-ARQ process assigned for transmission of lower priority data may be preempted for transmission of higher priority data when there is no available ARQ/H-ARQ process.