Sidelink Grant Resource Reselection for HARQ Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) feedback for sidelink transmissions, particularly in scenarios where HARQ feedback is enabled but no suitable transmission resources are available, leading to suboptimal resource allocation and performance.
Innovation Solution
A method is introduced where a wireless device enables HARQ feedback for a logical channel, selects to create a sidelink grant corresponding to transmissions of one or multiple MAC PDUs, and performs a transmission resource reselection check to determine if HARQ feedback is enabled on a carrier, triggering TX resource selection if necessary, to ensure optimal resource allocation for sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for a logical channel, then reliability of data transmission is improved, but resource allocation efficiency deteriorates when no suitable transmission resources are available
Solution Approach 1:
The patent implements dynamic resource reselection by allowing the wireless device to trigger new TX resource selection when the current sidelink grant expires or becomes unsuitable. This dynamic adjustment enables the system to adapt resource allocation in real-time, maintaining HARQ feedback reliability while improving overall resource utilization efficiency through flexible reselection among available grants.
2Productivity
If transmission resource reselection is performed frequently, then resource allocation optimality is improved, but system complexity increases
Solution Approach 1:
The patent changes the state parameter of sidelink grants from static to dynamic by implementing expiration mechanisms and reselection triggers. When a sidelink grant expires or when HARQ feedback requires retransmission, the system changes the resource allocation parameters by selecting new grants from available resources, thereby improving allocation optimality without requiring complex continuous monitoring.
3Device complexity
If sidelink grant pool is limited, then system simplicity is maintained, but transmission performance deteriorates when HARQ feedback is enabled
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple sidelink grants in the grant pool before transmission occurs. When HARQ feedback is enabled and a grant expires or becomes unsuitable, the system can immediately select from pre-available grants without requiring complex real-time resource negotiation, thus maintaining system simplicity while ensuring transmission reliability through prepared alternative resources.
Data Source
AI summary
A method and apparatus for data transmission considering feedback and sidelink resource allocation in a wireless communication system is provided. A wireless device enables a hybrid automatic repeat request (HARQ) feedback for a logical channel, selects to create a sidelink grant corresponding to transmissions of a single media access control (MAC) protocol data unit (PDU) or multiple MAC PDUs, and performs transmission resource reselection check. When there is no sidelink grant for which the HARQ feedback is enabled on a carrier, the wireless device triggers TX resource selection on the carrier.