Sidelink TX Resource Pool Selection for HARQ-Aware NR V2X
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Solution Overview
Problem
The existing TX resource pool selection mechanism in NR V2X communication is inadequate, as it does not effectively manage the selection of transmission resources in scenarios involving multiple configured or preconfigured pools.
Innovation Solution
The proposed solution involves the RRC layer sorting TX resource pools based on HARQ feedback requirements and providing sorted information to the MAC layer, which then selects resources dynamically based on logical channel priorities and availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TX resource pools are configured/preconfigured in NR V2X communication, then the system provides more resource options and flexibility, but the existing selection mechanism becomes inadequate and cannot effectively manage resource selection
Solution Approach 1:
The patent segments the TX resource pool selection process into two distinct layers: RRC layer responsible for sorting resource pools based on HARQ feedback requirements, and MAC layer responsible for dynamic resource selection based on logical channel priorities. This segmentation resolves the contradiction by distributing complexity across layers while maintaining flexibility in resource selection.
Solution Approach 2:
The patent introduces dynamic resource pool selection at the MAC layer, where the selected resource pool can change based on the priority of logical channels and availability conditions. This dynamic approach maintains adaptability while the RRC layer provides structured sorting to manage complexity.
2Reliability
If the system prioritizes HARQ feedback-enabled resources, then communication reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The RRC layer performs preliminary sorting of TX resource pools based on HARQ feedback requirements before MAC layer selection. This preliminary action ensures that reliability-critical resources are identified and prioritized in advance, reducing the complexity of real-time decisions at the MAC layer while maintaining high reliability.
Solution Approach 2:
The patent changes the parameter of resource pool identification by introducing HARQ feedback capability as a sorting criterion at the RRC layer. This parameter change enables the system to prioritize reliable resources without significantly increasing MAC layer complexity, as the sorting is performed beforehand.
3Productivity
If MAC layer performs dynamic resource selection based on logical channel priorities, then resource allocation efficiency is improved, but the coordination with RRC layer increases complexity
Solution Approach 1:
The patent clearly segments responsibilities between RRC and MAC layers: RRC performs static sorting based on HARQ feedback requirements, while MAC performs dynamic selection based on logical channel priorities. This segmentation improves efficiency by allowing independent optimization at each layer while minimizing coordination complexity through well-defined interfaces.
Solution Approach 2:
The RRC layer performs preliminary sorting of resource pools before MAC layer selection. This preliminary action reduces the complexity of MAC-RRC coordination by pre-processing resource pool information, so that MAC only needs to make final selection decisions based on current logical channel priorities without complex inter-layer coordination.
Data Source
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AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure relates to a method of a user equipment (UE) in a wireless communication system. The method comprises receiving configuration information for transmit (TX) resource pools including at least one of a first set of resource pools or a second set of resource pools; identifying, at a radio resource control (RRC) sub-layer, the first and second set of resource pools based on a hybrid automatic repeat request (HARQ) feedback channel; selecting, at a medium access control (MAC) sub-layer, a logical channel to transmit sidelink (SL) data, wherein the logical channel includes a highest priority among multiple logical channels using a logical channel prioritization (LCP) function; determining, at the MAC sub-layer, whether the logical channel is configured with the HARQ feedback channel; selecting, at the MAC sub-layer, a TX resource pool from the first set of resource pools based on a determination that the logical channel is configured with the HARQ feedback channel; and transmitting the SL data based on the TX resource pool.