5G Sidelink HARQ Feedback Timing for Sparse PSFCH Resources
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Solution Overview
Problem
In sidelink communication, there is a challenge in efficiently transmitting HARQ-ACK feedback information for multiple pieces of data using a physical sidelink feedback channel (PSFCH) since not all slots include available resources, necessitating a method for terminals to transmit feedback information effectively.
Innovation Solution
A method and apparatus for transmitting HARQ-ACK feedback through a sidelink, allowing reception terminals to transmit feedback to transmission terminals using optimized resource allocation and timing determination for HARQ-ACK feedback channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK feedback for multiple pieces of data is transmitted through one PSFCH, then feedback transmission efficiency is improved, but the complexity of resource allocation and timing determination increases
Solution Approach 1:
The patent segments the feedback transmission process into distinct phases: determining available PSFCH resources, selecting a target slot from multiple candidates, and transmitting feedback. This segmentation allows the system to handle multiple data pieces systematically by dividing the complex task into manageable steps, reducing overall complexity while maintaining efficiency
Solution Approach 2:
The patent applies preliminary action by pre-determining available PSFCH resources and establishing timing relationships before actual feedback transmission. The reception terminal identifies candidate slots and selects a target slot in advance, which simplifies the real-time transmission process and reduces complexity during critical feedback moments
2Reliability
If minimum processing time is introduced between PSSCH reception and PSFCH transmission, then processing reliability is improved, but transmission latency increases
Solution Approach 1:
The patent implements dynamic timing adjustment by allowing flexible selection of target slots from multiple candidates based on processing requirements. The system can adaptively choose the earliest suitable slot that satisfies minimum processing time constraints, thereby maintaining reliability while minimizing latency through dynamic optimization rather than fixed timing
Solution Approach 2:
The patent changes the timing parameter by introducing a configurable minimum processing time between PSSCH reception and PSFCH transmission. This parameter adjustment ensures adequate processing time for reliable feedback generation while the system optimizes to use the minimum necessary time, balancing reliability requirements with latency reduction
3Quantity of substance
If not all slots include PSFCH resources, then resource utilization is improved, but feedback transmission timing flexibility decreases
Solution Approach 1:
The patent applies universality by making the feedback transmission system adaptable to different slot configurations. The reception terminal can select from multiple candidate slots based on available PSFCH resources, allowing the same mechanism to work whether resources are sparse or dense, thereby maintaining timing flexibility despite varying resource availability
Solution Approach 2:
The patent adds a temporal dimension to resource selection by introducing multiple candidate slots across different time points. Instead of being constrained to a single slot type, the system operates across the time dimension, selecting from available slots based on both resource availability and timing requirements, thus restoring flexibility in a different dimensional space
Data Source
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AI summary
The disclosure relates to a communication technique for converging a 5G communication system for supporting a higher data transfer rate beyond a 4G system with an IoT technology, and a system therefor. The disclosure may be applied to intelligent services (for example, smart home, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety-related services, etc.) on the basis of a 5G communication technology and an IoT-related technology. In addition, the disclosure relates to a method performed by a terminal for feeding back a hybrid automatic repeat request (HARQ) and to a terminal for performing the method, the method including: generating HARQ feedback information for data that is scheduled for the terminal in at least one slot; determining a transmission timing of the HARQ feedback information based on a minimum processing time for transmission of a physical sidelink feedback channel (PSFCH) of the terminal; and transmitting the HARQ feedback information based on the determined timing, wherein the minimum processing time for the PSFCH transmission is determined based on at least one of a subcarrier spacing, a configuration of a resource pool, and a time interval between a PSSCH and the PSFCH.