V2X Communication Device Half-Duplex Mitigation via Feedback Control
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Solution Overview
Problem
In V2X communication, particularly in NR V2X, the half-duplex problem restricts transmission and reception to a time division manner, leading to reduced communication efficiency due to the limitations in handling larger data volumes in unicast communication compared to broadcast communication.
Innovation Solution
A communication device equipped with a communication unit for wireless communication, an acquisition unit to gather information on transmission conditions, and a control unit to manage data reception and transmission based on acquired information, enabling efficient resource allocation and prioritization to mitigate the half-duplex issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division manner is used for transmission and reception in half-duplex mode, then transmission or reception can be performed, but communication efficiency deteriorates due to restrictions on simultaneous transmission and reception
Solution Approach 1:
The transmitting terminal notifies the receiving terminal of the transmission condition (whether transmission and reception can be performed simultaneously) through feedback information. This allows the receiving terminal to adjust its operation accordingly, enabling full-duplex operation when possible and half-duplex when necessary, thus resolving the contradiction between maintaining transmission/reception capability and ensuring communication efficiency
Solution Approach 2:
The system dynamically switches between half-duplex and full-duplex modes based on the transmission condition information. When the transmitting terminal can perform both transmission and reception simultaneously, the system operates in full-duplex mode for high efficiency. When restricted to half-duplex, the system adapts accordingly, optimizing communication efficiency under different operational states
2Adaptability or versatility
If unicast communication with larger data volume is supported in NR V2X, then communication capability is improved, but the half-duplex problem emerges more significantly
Solution Approach 1:
The transmitting terminal provides feedback information about its transmission condition to the receiving terminal. This enables the receiving terminal to understand whether the transmitter can simultaneously perform reception, allowing unicast communication with larger data volumes to proceed without significant half-duplex problems when the transmitter has full capability
Solution Approach 2:
The system changes operational parameters (transmission and reception modes) based on the transmission condition information. When the transmitting terminal can perform both operations simultaneously, unicast communication with larger data volumes can be supported without half-duplex restrictions. When restricted, the system adjusts to half-duplex mode, managing the trade-off between data volume capability and half-duplex problem occurrence
Data Source
AI summary
It is possible to further suppress emergence of a half duplex (HD) problem in inter-device communication such as V2X communication. A communication device includes: a communication unit (220) that performs wireless communication; an acquisition unit (243) that acquires first information from a first communication device via the wireless communication, the first information being information regarding a transmission condition of data using a communication mode of switching transmission and reception in a time division manner to perform the inter-device communication; and a control unit (241) that controls an operation related to reception of data transmitted from the first communication device according to the first information.