D2D Transmitter Relay Mode Selection for Vehicular Reliability
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Solution Overview
Problem
Current wireless D2D communication systems face challenges in achieving low latency and high reliability, especially in vehicular environments, where conventional approaches lack effective relay network architectures for 5G heterogeneous Radio Access Technologies and enhanced relay functionalities.
Innovation Solution
The proposed solution involves a transmitter communication device that uses one or more relay communication devices to implement hybrid AF and DF relay cooperative transmissions, enhancing the 3GPP LTE-D2D framework by selecting suitable relay modes such as amplify and forward, decode and forward, and time-domain equalization to achieve low latency and high reliability in D2D communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional D2D communication approaches are used, then device complexity is reduced, but reliability and latency performance deteriorate in vehicular environments
Solution Approach 1:
The patent introduces relay communication devices as intermediary nodes between transmitter and receiver vehicles. These relays forward communication signals to extend coverage and improve reliability in vehicular environments where direct communication may fail due to distance or obstacles, thereby resolving the contradiction between maintaining simple device architecture and achieving reliable communication.
Solution Approach 2:
The patent segments the communication network into multiple functional components: transmitter devices, relay devices, and receiver devices. This segmentation allows the system to distribute communication functions across multiple nodes, improving overall reliability while managing complexity through modular architecture where each device performs specific relay or communication tasks.
2Area of stationary object
If relay communication devices are added to expand coverage, then communication reliability improves, but device complexity increases
Solution Approach 1:
The patent extends communication coverage by adding spatial dimension through relay nodes positioned at different locations. Relay devices create additional communication paths and extend the coverage area beyond direct line-of-sight limitations, effectively using spatial dimensionality to overcome coverage constraints without requiring complex centralized control.
Solution Approach 2:
Relay communication devices serve as intermediary nodes that extend coverage area by forwarding signals between transmitter and receiver vehicles. These intermediaries enable communication over extended distances and in non-line-of-sight conditions, expanding the effective coverage area while maintaining relatively simple device-level operations.
3Reliability
If multiple relay modes are implemented for optimal performance, then communication quality improves, but device complexity increases
Solution Approach 1:
The patent implements dynamic relay mode selection where relay devices can operate in different modes (amplify-and-forward, decode-and-forward, time-domain equalization) based on channel conditions and communication requirements. This dynamic adaptability allows the system to optimize packet delivery reliability for different scenarios while keeping individual device complexity manageable through automated mode selection rather than manual configuration.
Solution Approach 2:
The patent changes operational parameters of relay devices by switching between different relay modes (AF, DF, TDE) depending on communication conditions. This parameter change approach allows optimization of communication quality and reliability for different scenarios without requiring fundamentally different device architectures, thereby managing complexity through configurable parameters rather than hardware complexity.
4Reliability
If direct D2D communication is used, then device complexity is minimized, but coverage area and reliability deteriorate
Solution Approach 1:
The patent introduces relay communication devices as intermediaries to overcome the limitations of direct D2D communication. These relays enable communication between vehicles that are out of direct range or experience poor channel conditions, significantly improving reliability while adding only moderate architectural complexity through the relay node infrastructure.
Solution Approach 2:
The patent segments the communication path into multiple hops through relay devices, transforming a single direct communication link into a multi-segment pathway. This segmentation improves reliability by providing alternative paths and extending coverage, while managing complexity through standardized relay functions that can be implemented across multiple devices.
Data Source
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AI summary
The invention relates to a transmitter communication device (101) for a D2D communication network (100) with a plurality of communication devices, including one or more receiver communication devices (103-1, 103-2) and a plurality of relay communication devices (102). The transmitter communication device (101) comprises: a processor (101b) configured to select a subset of plurality of relay communication devices (102) for relaying a communication message to the one or more receiver communication devices (103-1, 103-2) and to configure the subset of relay communication devices (102) to relay the communication message using one of a plurality of relay modes, including a first relay mode or a second relay mode, wherein the first relay mode is an "amplify and forward" relay mode and wherein the second relay mode is a "decode and forward" relay mode; and a communication interface (101a) configured to transmit the communication message to the one or more receiver communication devices (103-1, 103-2) via the subset of relay communication devices (102).