D2D Control and Data Channels for Out-of-Coverage Communication
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Solution Overview
Problem
Existing device-to-device (D2D) wireless communication technologies face challenges in establishing peer-to-peer links without a centralized network scheduler, particularly in ensuring reliable control and data communication, especially for link budget limited devices operating out-of-coverage.
Innovation Solution
The implementation of techniques that allow peer devices to synchronize and perform discovery for control and data communications using shared channels, with flexible control signaling acknowledgments and multiple transmission attempts, including initial low-power multi-tone transmissions and subsequent higher-power single-tone transmissions if necessary, to ensure reliable communication without excessive power or resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission attempts are performed with higher power for retransmissions, then reliability of control communication is improved, but power consumption and resource usage increase
Solution Approach 1:
The patent applies dynamics by making the transmission power and tone configuration adjustable based on communication conditions. The system dynamically switches between multi-tone low-power mode for initial transmissions and single-tone high-power mode for retransmissions, optimizing the balance between reliability and power consumption rather than using a fixed configuration
Solution Approach 2:
The patent changes transmission parameters (power level, tone configuration) based on the transmission attempt number and channel conditions. Initial transmissions use multi-tone with lower power, while retransmissions use single-tone with higher power, demonstrating parameter adaptation to resolve the contradiction between reliability and power usage
2Reliability
If different control channels are used for transmit and receive operations, then control communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the control communication function into separate transmit control channels and receive control channels. This segmentation allows independent optimization of each channel's characteristics and enables more reliable control signaling by dedicating specific channels to specific directions, while the complexity is managed through systematic channel design
3Adaptability or versatility
If peer devices perform discovery and establish resources without centralized network scheduler, then adaptability and coverage are improved, but coordination difficulty and communication overhead increase
Solution Approach 1:
The patent implements self-service by enabling peer devices to autonomously perform discovery, synchronize, and establish communication resources without requiring a centralized network scheduler. Devices independently execute discovery procedures and negotiate resource allocation, improving coverage and adaptability while managing coordination through standardized protocols
Solution Approach 2:
The patent uses feedback mechanisms where devices exchange control information and acknowledgments to coordinate their actions. Through feedback loops in the discovery and resource establishment process, devices achieve coordinated operation autonomously, managing the complexity of distributed coordination
Data Source
AI summary
This disclosure relates to techniques for supporting narrowband device-to-device wireless communication, including possible techniques for performing control and data communications between wireless devices that have performed discovery. A first device may transmit first control information to a second wireless device. The first control information may indicate a buffer status of the first wireless device. The first device may receive second control information from the second wireless device. The second control information may include an acknowledgement indication for the first control information. The first device may transmit a data communication to the second wireless device based at least in part on the first control information and the second control information.