Sidelink HARQ Feedback Prioritization via PSFCH Segmentation
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Solution Overview
Problem
Current sidelink communication systems in new radio (NR) networks face challenges in efficiently transmitting and receiving hybrid automatic repeat request (HARQ) feedback information, particularly in configuring resources for feedback transmission and managing priorities in HARQ responses, which affects communication performance.
Innovation Solution
The proposed solution involves an operation method for sidelink communications where a receiving terminal generates and prioritizes HARQ responses based on transport block and code block group priorities, and transmits these responses through a physical sidelink feedback channel (PSFCH) resource, with the option to use different modulation and coding schemes for retransmissions, and configures PSFCH resources independently or shared with existing formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If HARQ feedback information for multiple code block groups is transmitted simultaneously, then the feedback completeness is improved, but the resource conflict and transmission reliability deteriorate
Solution Approach 1:
The patent segments HARQ feedback information into multiple priority levels (first priority and second priority). The receiving terminal transmits first priority HARQ feedback information on the first PSFCH occasion and second priority HARQ feedback information on the second PSFCH occasion, preventing resource conflicts while maintaining feedback completeness through staged transmission across multiple time resources.
2Adaptability or versatility
If PSFCH resources are configured for multiple HARQ responses, then the feedback capability is improved, but the resource configuration complexity increases
Solution Approach 1:
The patent divides PSFCH transmission resources into multiple occasions (first PSFCH occasion and second PSFCH occasion) with different priority levels. This segmentation allows the system to support multiple HARQ responses without requiring a single complex resource configuration, as each priority level has its own dedicated transmission opportunity.
Solution Approach 2:
The patent implements dynamic priority-based resource allocation where the receiving terminal selects which HARQ feedback information to transmit based on priority levels. The transmitting terminal dynamically determines which PSFCH occasion to monitor based on the priority of the sent data, allowing flexible adaptation to different traffic conditions without fixed complex configurations.
3Ease of manufacture
If retransmission uses the same modulation and coding scheme, then the implementation simplicity is improved, but the communication efficiency deteriorates
Solution Approach 1:
The patent implements dynamic MCS selection for retransmissions. The transmitting terminal determines the MCS for retransmitting code block groups based on the priority level of the data and channel conditions. High priority data may use more robust MCS while lower priority data can use less robust MCS, optimizing communication efficiency while maintaining implementation feasibility through priority-based rules.
Data Source
AI summary
An operation method of a receiving terminal in sidelink communications may comprise: receiving one or more transport blocks (TBs) from a transmitting terminal; generating hybrid automatic repeat request (HARQ) responses for code block groups (CBGs) included in each of the one or more TBs; selecting one or more HARQ responses from among the HARQ responses based on priorities; and transmitting the one or more HARQ responses to the transmitting terminal through a physical sidelink feedback channel (PSFCH) resource.