D2D Scheduling Assignment Retransmission for Half-Duplex Resource Efficiency
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Solution Overview
Problem
Current D2D communication systems face challenges in ensuring data transmission and reception between D2D user equipments without the intervention of a base station, particularly in half-duplex scenarios where data mismatch and resource inefficiency occur.
Innovation Solution
A method for retransmitting scheduling assignment (SA) information between half-duplex user equipments, involving the reception of SA information, determination of retransmission need, and retransmission through a different resource region, utilizing a processor and radio frequency unit in the first user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D user equipments transmit and receive data without base station intervention, then communication independence and direct data transmission are improved, but data mismatch and transmission reliability deteriorate in half-duplex scenarios
Solution Approach 1:
The patent implements a feedback mechanism where the first user equipment transmits scheduling assignment information to the second user equipment, which then feeds back reception status information. This feedback loop enables the first user equipment to determine whether retransmission is necessary, thereby ensuring reliable data transmission while maintaining D2D communication independence.
Solution Approach 2:
The patent applies preliminary action by having the first user equipment transmit scheduling assignment information before actual data transmission. This allows the second user equipment to prepare for reception and enables the first user equipment to anticipate potential reception failures, initiating retransmission procedures only when necessary based on the feedback received.
2Reliability
If D2D user equipments perform data retransmission, then data transmission reliability is improved, but radio resource usage and system efficiency worsen
Solution Approach 1:
The feedback mechanism allows the first user equipment to receive reception status information from the second user equipment and make informed decisions about retransmission. This ensures that retransmission occurs only when actually needed, avoiding unnecessary radio resource consumption while maintaining reliability.
Solution Approach 2:
The patent implements dynamic retransmission control where the first user equipment adjusts its behavior based on real-time feedback. The system dynamically determines whether to proceed with retransmission based on the reception status, optimizing radio resource usage by activating retransmission only when necessary rather than using it continuously.
3Productivity
If half-duplex user equipments share the same resource region for transmission, then resource efficiency is improved, but data mismatch and interference increase
Solution Approach 1:
The patent segments the communication process into distinct phases: scheduling assignment information transmission, reception status feedback, and conditional data retransmission. This segmentation allows half-duplex user equipments to share resource regions efficiently while avoiding data mismatch by ensuring proper sequencing and acknowledgment of each phase.
Solution Approach 2:
The feedback of reception status information enables the first user equipment to determine whether the second user equipment has correctly received the scheduling assignment information. This feedback loop prevents data mismatch by ensuring that retransmission only occurs when necessary, maintaining resource efficiency while preventing information loss.
Data Source
AI summary
Disclosed is a method for retransmitting scheduling assignment (SA) information between half-duplex user equipment in a wireless communication system. The method for retransmitting SA information may comprise the steps of: receiving, through a first resource area, a D2D signal including first SA information transmitted by a second user equipment, and second SA information transmitted by a third user equipment; if the target user equipment of the second SA information is the second user equipment, determining whether to retransmit the second SA information for the second user equipment; and if it is determined to retransmit the second information, transmitting the second information through a second resource area.