Communication Device Channel Sensing for Low-Delay Transmission
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G New Radio (NR), face challenges in achieving low-delay and high-reliability communication, especially when compared to LTE, and require techniques that can adapt to various use cases to enhance overall system transmission efficiency.
Innovation Solution
The proposed solution involves a communication apparatus and method that supports multiple radio access technologies, including LTE and NR, with features such as dual connectivity, carrier aggregation, and multichannel sensing for efficient resource allocation and channel access, allowing for flexible design and reduced latency in communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NR is used to achieve lower delay and higher reliability compared to LTE, then communication performance is improved, but system complexity increases
Solution Approach 1:
The patent segments the channel access procedure into distinct phases: LBT execution phase and data transmission phase. The base station and terminal apparatus independently perform LBT on respective channels, and only proceed to data transmission when both channels are confirmed available. This segmentation resolves the contradiction by creating a structured, manageable process that ensures reliable communication through coordinated channel access while maintaining clear procedural boundaries that reduce operational complexity.
Solution Approach 2:
The patent implements preliminary LBT (Listen Before Talk) actions before actual data transmission. Both the base station and terminal apparatus perform channel sensing and validation in advance to ensure channel availability. This preliminary action prevents collision and ensures reliable transmission, resolving the contradiction by establishing communication reliability through pre-validation while keeping the mechanism simple through standardized LBT procedures.
2Productivity
If flexible design is implemented to adapt to various use cases, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic channel selection where the base station and terminal apparatus can flexibly choose from multiple uplink channels (PUCCH, PUSCH, SRS) based on real-time conditions and use case requirements. The system dynamically adjusts which channel to use for data transmission after successful LBT, enabling adaptation to various scenarios (eMBB, mMTC, URLLC) while maintaining a unified LBT framework that prevents complexity escalation.
Solution Approach 2:
The patent enables parameter changes in channel selection and transmission configuration based on different use cases. The base station can indicate different uplink channels and transmission parameters to the terminal apparatus through downlink control information, allowing flexible adaptation to various scenarios while maintaining systematic control. This resolves the contradiction by providing transmission efficiency through parameter flexibility within a structured control framework.
Data Source
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AI summary
To implement low-delay and highly reliable communication in a more suitable manner. A communication apparatus including: a control unit that performs control such that data are transmitted to a transmission destination via at least any one of a plurality of channels shared in communication with each of a plurality of apparatuses; and a determination unit that determines whether or not the plurality of channels is available for transmission of the same data, in which the control unit performs control such that in a case where at least one of the plurality of channels has continued to be available for data transmission beyond a period set for the channel, data are transmitted by use of the channel.