Sidelink SCI Time-Domain Resource Assignment for HARQ-Aware Reservation
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Solution Overview
Problem
The existing 3GPP NR sidelink communication systems face challenges in efficiently determining the maximum number of sidelink resources reserved for transmission, particularly in scenarios where HARQ retransmission is disabled, leading to suboptimal resource allocation and potential communication inefficiencies.
Innovation Solution
A method for user equipment to determine the value of the time domain resource assignment indication field in sidelink control information (SCI) by receiving sidelink scheduling information, which includes determining the number of sidelink time-frequency resources and setting the indication field values based on the number of resources indicated by the scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the maximum number of sidelink resources reserved for one sidelink transmission is limited to 2 or 3 in NR sidelink, then device complexity is reduced and resource allocation is simplified, but resource allocation efficiency deteriorates and communication performance is suboptimal
Solution Approach 1:
The patent makes the maximum number of reserved sidelink resources dynamic by allowing it to be adjusted based on whether HARQ retransmission is enabled or disabled. When HARQ is disabled, the maximum number increases from 2 or 3 to 4, allowing the system to adapt resource allocation capacity to actual communication needs rather than using a fixed limit.
Solution Approach 2:
The patent changes the parameter of maximum reserved resources from a fixed value (2 or 3) to a conditional value that depends on HARQ configuration. This parameter change enables the system to optimize resource allocation efficiency by increasing the maximum reserved resources to 4 when HARQ retransmission is disabled, while maintaining lower complexity when HARQ is enabled.
2Productivity
If the maximum number of sidelink resources reserved for one sidelink transmission is increased to 4, then resource allocation efficiency is improved, but device complexity and resource management overhead increase
Solution Approach 1:
The patent conditionally changes the maximum number of reserved resources parameter based on HARQ configuration. Instead of always using the higher value of 4, the system only increases the maximum to 4 when HARQ retransmission is disabled, thereby improving resource allocation efficiency only when necessary while avoiding unnecessary complexity increases when HARQ is enabled.
Solution Approach 2:
The patent implements dynamic resource reservation capacity that adapts to HARQ configuration. The maximum number of reserved resources transitions between different values (2 or 3 when HARQ is enabled, 4 when HARQ is disabled) based on real-time communication requirements, optimizing the balance between resource allocation efficiency and device complexity.
3Loss of time
If HARQ retransmission is disabled in sidelink communication, then resource allocation is simplified and latency is reduced, but reliability deteriorates and communication robustness decreases
Solution Approach 1:
The patent changes the maximum reserved resources parameter based on HARQ configuration to compensate for the loss of retransmission capability. When HARQ is disabled to reduce latency, the system increases the maximum reserved resources from 2 or 3 to 4, providing additional resource availability to improve reliability without requiring retransmission.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment, and user equipment. The method includes: receiving sidelink scheduling information transmitted by a base station; determining time domain resource interval indication information T1 and/or T2; and determining a value TRIV′ of a time domain resource indication field in sidelink control information (SCI) format 0-1.