Autonomous D2D Resource Selection with Blind HARQ
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Solution Overview
Problem
In device-to-device (D2D) communications, existing systems face challenges in ensuring high reliability for D2D transmissions, particularly in selecting optimal resources for transmissions to enhance the likelihood of successful receipt by receiving UEs, especially in scenarios where traditional hybrid acknowledgment receipt request (HARQ) processes may fail.
Innovation Solution
A method and apparatus for autonomous resource selection in D2D communications, where a transmitting UE identifies a candidate set of resources, selects a first resource for a primary transmission, determines a subset of resources for a blind HARQ transmission, and selects a second resource within this subset, allowing for enhanced reliability by transmitting the first transmission using the first resource and the second transmission using the second resource, which may be randomly selected from remaining resources within a predetermined time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ processes are used for D2D transmissions, then the system maintains standard protocol compatibility, but the reliability of transmission is insufficient in scenarios where HARQ may fail
Solution Approach 1:
The patent introduces blind HARQ transmissions as a preliminary action before the traditional HARQ acknowledgment process. The transmitting UE sends a blind HARQ transmission without waiting for NACK confirmation, proactively enhancing reliability by providing an additional transmission opportunity in advance, which resolves the contradiction by improving reliability while maintaining protocol compatibility through optional deployment
2Reliability
If multiple transmissions are implemented to enhance reliability, then the likelihood of successful receipt improves, but the resource consumption increases
Solution Approach 1:
The patent applies local quality by implementing blind HARQ transmissions selectively for specific D2D transmission scenarios rather than universally. The transmitting UE determines whether to send blind HARQ based on local conditions such as channel quality and transmission importance, thereby enhancing reliability for critical transmissions while avoiding unnecessary resource consumption in scenarios where traditional HARQ suffices
Solution Approach 2:
The patent employs partial action by sending blind HARQ transmissions only for certain D2D communications rather than all transmissions. The transmitting UE partially utilizes the blind HARQ mechanism based on transmission requirements, achieving enhanced reliability for selected transmissions without the excessive resource consumption that would result from applying it to all transmissions universally
3Adaptability or versatility
If autonomous resource selection is implemented for blind HARQ transmissions, then the adaptability of the system improves, but the complexity of resource management increases
Solution Approach 1:
The patent implements self-service by enabling the transmitting UE to autonomously select resources for blind HARQ transmissions without requiring complex centralized scheduling. The UE independently identifies available resources from the configured D2D resources, determining candidate sets and selecting resources based on local information, thereby achieving adaptability while minimizing resource management complexity through decentralized autonomous decision-making
Data Source
AI summary
A user equipment (UE) may communicate with one or more other UEs using multiple transmissions in a device-to-device (D2D) communications deployment. A number of UEs may be configured with D2D resources, and a transmitting UE may identify available D2D resources from the configured resources. The transmitting UE may identify a resource for a first transmission of a D2D transmission from the available D2D resources, and may identify a second resource for a second transmission of the D2D transmission. The second transmission may be a blind HARQ transmission that may be transmitted to enhance the likelihood that one or more receiving UEs successfully receive the transmission. In some examples, the second resource may be identified based on other available resources within an predetermined time window around the first transmission.