Dynamic CTS Signal Power and Format for 5G Unlicensed Bands
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Solution Overview
Problem
In 5G systems using unlicensed frequency bands, signal transmission between sending and receiving nodes is affected by interference, leading to performance issues due to the inability to receive clear-to-send (CTS) signals, which causes data transmission conflicts.
Innovation Solution
The receiving node determines the sending power and/or signal format of the CTS signal based on channel conditions and sends it to the sending node, allowing the sending node to detect the CTS signal across multiple channel formats, thereby improving signal transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving node uses fixed sending power and signal format for CTS signal, then the device complexity is reduced, but the signal transmission reliability deteriorates due to interference in unlicensed frequency bands
Solution Approach 1:
The patent implements dynamic adjustment of CTS signal parameters by making the sending power and signal format adaptable to channel conditions. The receiving node determines sending power based on detected channel state, and selects signal format from multiple predefined formats according to interference levels, transforming fixed parameters into dynamic ones that adapt to varying environmental conditions.
Solution Approach 2:
The patent changes the parameters of the CTS signal (sending power and signal format) based on channel conditions. The receiving node adjusts the sending power of the CTS signal according to detected interference levels, and selects different signal formats (e.g., different time-domain lengths or frequency configurations) to optimize transmission reliability under different channel states.
2Productivity
If the sending node transmits data without receiving CTS signal confirmation, then the productivity is improved, but the loss of information increases due to undetected interference and data transmission conflicts
Solution Approach 1:
The patent establishes a feedback mechanism where the receiving node sends a CTS signal back to the sending node to confirm channel availability. The sending node must successfully receive and detect this CTS signal before transmitting data, creating a closed-loop feedback system that prevents data transmission conflicts by ensuring both nodes have confirmed channel readiness.
Solution Approach 2:
The patent implements preliminary action by requiring the receiving node to send the CTS signal before the sending node transmits data. This preliminary confirmation step ensures that the channel is clear and both nodes are synchronized, preventing data transmission conflicts before they occur rather than handling them after data transmission begins.
3Measurement precision
If the receiving node sends CTS signal with high sending power, then the reliability of CTS detection is improved, but the object-affected harmful factors increase due to interference with other transmissions in unlicensed bands
Solution Approach 1:
The patent changes the sending power parameter of the CTS signal based on channel conditions and interference levels. The receiving node adjusts the CTS sending power dynamically - using higher power when channel conditions are poor or interference is high to ensure detection, and lower power when conditions are good to minimize interference with other transmissions in the unlicensed band.
Data Source
AI summary
A method and device for signal transmission are provided. The method includes that: a receiving node receives a request-to-send (RTS) signal from a sending node; the receiving node determines a sending power and/or a signal format of a clear-to-send (CTS) signal; and the receiving node sends, according to the sending power and/or the signal format, the CTS signal to the sending node. Accordingly, after the sending node sends the RTS signal to the receiving node, the receiving node can determine the sending power and/or the signal format of the RTS signal, and send the CTS signal to the sending node based on the sending power and/or the signal format.