D2D Signal Transmission via TTI Bundling for Reliability
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in efficiently transmitting and receiving signals due to overhead and reliability issues, particularly in scenarios where transmission time interval (TTI) bundling is not effectively applied, leading to suboptimal signal coverage and reliability.
Innovation Solution
A method for transmitting and receiving D2D signals that involves receiving an uplink grant and performing uplink transmission in subframes, with the option to transmit redundancy versions in multiple subframes, allowing for PHICH response reception after a specific number of subframes, thereby implementing TTI bundling to reduce overhead and enhance signal reliability and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is applied in D2D communication, then signal reliability and coverage are improved, but transmission time and processing complexity increase
Solution Approach 1:
The patent segments the transmission process into bundled TTIs (Transmission Time Intervals), where multiple consecutive TTIs are grouped together to form a bundle. This segmentation allows the receiver to accumulate signal energy across multiple time slots, thereby improving signal reliability and coverage for D2D communications without requiring each individual TTI to be extremely long.
Solution Approach 2:
The patent merges multiple TTI transmissions into a single bundled transmission unit. By combining the signal transmissions across multiple consecutive TTIs into one bundled structure, the system achieves improved reliability through diversity gain while managing the time overhead through structured consolidation rather than sequential independent transmissions.
2Reliability
If TTI bundling is applied in D2D communication, then signal coverage is improved, but overhead increases
Solution Approach 1:
The patent implements a universal TTI bundling mechanism that serves multiple functions simultaneously: it improves signal coverage, enables coverage enhancement for edge users, and provides a structured framework for resource allocation. The bundling structure itself becomes a multi-functional tool that addresses both reliability and overhead management concerns through standardized processing.
3Reliability
If redundancy versions are transmitted in multiple subframes, then signal reliability is improved, but transmission duration increases
Solution Approach 1:
The patent applies preliminary action by transmitting redundancy versions in advance across multiple subframes before the final decoding is complete. The receiver accumulates these redundancy versions during the bundled TTIs, allowing for progressive decoding and reducing the need for extremely long transmission durations while maintaining high reliability through the accumulated redundancy information.
Data Source
AI summary
An embodiment of the present invention provides a method for a terminal for transceiving a device-to-device (D2D) signal in a wireless communication system, the method for transceiving a D2D signal comprising: receiving an uplink grant; and performing uplink transmission in one or more subframes containing a fourth subframe from the subframe in which the uplink grant has been received, wherein if the uplink transmission is a transmission of a redundancy version from two or more subframes corresponding to a single bundle, the terminal receives a PHICH from the uplink transmission from any one from among the sixth subframe or the 16th subframe from the final subframe from among the two or more subframes.