Sidelink HARQ Feedback Resource Allocation for V2X
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing sidelink feedback transmission and determining feedback resources, leading to power consumption issues and unreliable communications in vehicle-to-everything (V2X), vehicle-to-vehicle (V2V), and device-to-device (D2D) systems due to the lack of effective methods for hybrid automatic repeat request (HARQ) feedback resource allocation.
Innovation Solution
The implementation of techniques that allow communication devices to determine and utilize HARQ resource sets for efficient sidelink feedback transmission, enabling reliable and power-efficient communications by identifying optimal resource locations based on data transmission parameters and UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback transmission is implemented in sidelink communications, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the feedback resources by dividing the time domain into slots and further dividing each slot into multiple feedback resources. This segmentation allows UEs to transmit HARQ feedback in specific allocated resources rather than continuously monitoring, thereby reducing power consumption while maintaining reliable communication through structured feedback transmission opportunities.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple HARQ feedback resource sets before actual feedback transmission is needed. The gNB or UE determines and allocates feedback resources in advance based on data transmission parameters, allowing the receiving UE to know exactly when and where to transmit feedback without needing to continuously monitor or make real-time decisions, thus reducing power consumption.
2Productivity
If feedback resources are dynamically allocated, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-determining and allocating HARQ feedback resource sets before the actual feedback transmission occurs. The gNB configures the UE with multiple feedback resource sets in advance, and the UE selects the appropriate set based on pre-established criteria rather than making complex real-time decisions, thereby achieving efficient resource utilization without excessive system complexity.
Solution Approach 2:
The patent utilizes parameter changes by allowing the selection of different feedback resource sets based on varying data transmission parameters such as modulation and coding scheme (MCS), resource block (RB) allocation, and feedback timing. This parameter-based approach enables dynamic adaptation to different communication conditions while maintaining manageable system complexity through structured parameter mapping.
3Reliability
If multiple HARQ feedback resource sets are configured, then feedback transmission reliability is improved, but feedback delay increases
Solution Approach 1:
The patent segments feedback transmission into multiple resource sets that can be activated or selected based on timing requirements. By dividing the feedback resources into distinct sets with different timing characteristics, the system can select the most appropriate set for each situation, ensuring reliable feedback transmission while minimizing unnecessary delays through targeted resource allocation.
Solution Approach 2:
The patent applies dynamics by enabling the UE to dynamically select or switch between different HARQ feedback resource sets based on real-time communication conditions and timing requirements. This dynamic adaptation allows the system to optimize between reliability and latency by choosing the most suitable resource set for each specific feedback transmission occasion rather than being fixed to a single timing pattern.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE), may receive a data transmission and determine a slot to transmit a hybrid automatic repeat request (HARQ) feedback based on the data transmission. The communication device may determine one or more HARQ feedback resources or one or more HARQ feedback resource sets in the slot to transmit the HARQ feedback, where the one or more hybrid automatic repeat request feedback resources or the one or more hybrid automatic repeat request feedback resource sets in the slot comprises a set of frequency resources associated with the slot, and transmit the HARQ feedback using the one or more HARQ feedback resources or the one or more HARQ feedback resource sets in the slot.