Sidelink Resource Selection With HARQ Feedback and PUCCH Timing
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Solution Overview
Problem
Current LTE V2X transmission schemes face inefficiencies in resource utilization and are suboptimal for aperiodic traffic, leading to potential collisions and reduced reliability in sidelink communications.
Innovation Solution
Implement methods for improved resource selection and reservation in sidelink communications by utilizing hybrid automatic repeat request (HARQ) feedback and dynamic signaling, including two-stage sidelink control information (SCI) to prioritize resource allocation based on reservation types, adjusting exclusion thresholds, and indicating reservation information in SCI to enhance resource selection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE mode 4 relies on sensing and reservation to avoid collisions, then collision avoidance is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the base station receives HARQ feedback from UEs about sidelink transmission outcomes and uses this information to dynamically adjust uplink grant allocations. This feedback loop enables the network to optimize resource allocation based on actual transmission needs, improving resource utilization while maintaining collision avoidance through coordinated scheduling.
Solution Approach 2:
The patent introduces dynamic resource allocation where the base station can adjust uplink grant parameters (such as time-frequency resources, modulation and coding schemes) based on received HARQ feedback. This dynamic adaptation allows the system to respond to changing channel conditions and traffic patterns, improving overall resource utilization efficiency while maintaining reliable collision-free transmissions.
2Stability of the object's composition
If LTE mode 4 is designed for periodic traffic, then periodic traffic handling is improved, but aperiodic traffic performance deteriorates
Solution Approach 1:
The patent enables dynamic adjustment of uplink grant parameters based on HARQ feedback, allowing the system to adapt resource allocation to match actual traffic patterns. This dynamic capability allows the same mechanism to effectively handle both periodic traffic (through consistent scheduling) and aperiodic traffic (through flexible resource adjustments), eliminating the need for separate optimization modes.
Solution Approach 2:
The patent changes key scheduling parameters (time-frequency resources, modulation schemes, code rates) dynamically based on received HARQ feedback and traffic requirements. This parameter adaptability allows the system to optimize for periodic traffic when patterns are regular, while seamlessly adjusting to handle aperiodic traffic bursts, thereby improving versatility without sacrificing periodic traffic handling capabilities.
3Reliability
If multiple PUCCH resources are allocated for HARQ feedback reporting, then feedback reliability is improved, but uplink control channel resource overhead increases
Solution Approach 1:
The patent dynamically determines the number and allocation of PUCCH resources based on the actual number of sidelink transmissions and HARQ feedback requirements. Rather than allocating fixed multiple resources, the system adjusts resource allocation in real-time, using more resources when multiple transmissions require parallel feedback reporting, and fewer resources when single transmissions suffice, thereby optimizing the balance between reliability and resource overhead.
Solution Approach 2:
The patent changes PUCCH resource allocation parameters (number of resources, time-frequency positions, resource blocks) based on the specific transmission scenario and HARQ feedback needs. This parameter adaptation allows the system to allocate sufficient resources for reliable feedback reporting when necessary, while minimizing resource overhead in scenarios with fewer transmissions, thus resolving the contradiction between reliability and resource consumption.
Data Source
AI summary
A first user equipment (UE) is configured to receive from a base station a signaling comprising indication of one or more time-frequency resources and an indicator indicating a time gap, and transmit a transport block (TB) to a second UE using the one or more time-frequency resources. For each of the time-frequency resources, the first UE monitors a hybrid automatic repeat request (HARQ) feedback from the second UE, using a physical sidelink feedback channel (PSFCH) resource; and transmits to the base station a HARQ feedback report signal based on the HARQ feedback or absence thereof, in a physical uplink control channel (PUCCH), using a single PUCCH resource determined based on the time gap from a last one of the PSFCH resources.