RTS CTS Handshaking for 5G Unlicensed Beam Selection
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Solution Overview
Problem
In 5G systems, the efficiency of signal transmission between sending and receiving nodes in unlicensed frequency bands is hindered by increased path loss and reduced coverage, necessitating improved beamforming and channel allocation methods to avoid signal collisions.
Innovation Solution
The implementation of a request-to-send (RTS) and clear-to-send (CTS) signal mechanism, where the receiving node sends a CTS signal with beam information of candidate beams, allowing the sending node to transmit channels based on this information, thereby optimizing channel transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data transmission is performed in unlicensed frequency band, then 5G system compatibility is improved, but path loss increases and coverage is reduced
Solution Approach 1:
The patent implements preliminary channel access verification through RTS/CTS handshaking before actual data transmission. The sending node sends RTS to reserve the channel, and the receiving node responds with CTS to confirm channel availability, preventing signal collisions and ensuring reliable transmission in unlicensed bands
2Device complexity
If traditional signal transmission without beam information is used, then device complexity is reduced, but signal collisions increase and transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by incorporating beam information specifically in the CTS signal rather than throughout the entire communication protocol. The CTS signal contains beam indication information that guides the sending node to use appropriate beams for channel transmission, improving spatial selectivity and transmission efficiency without overwhelming system complexity
Solution Approach 2:
The receiving node provides feedback about channel quality and beam information in the CTS signal, enabling the sending node to adapt its transmission parameters. This feedback mechanism allows dynamic optimization of beam selection based on actual channel conditions, resolving the contradiction between simplicity and efficiency
3Productivity
If beam information is included in CTS signal, then channel transmission efficiency is improved, but signal processing complexity increases
Solution Approach 1:
Beam information is exchanged in advance during the RTS/CTS handshaking phase before actual data transmission begins. This preliminary beam selection allows both nodes to prepare appropriate receive and transmit beams, ensuring efficient channel transmission when data transfer starts without adding real-time processing complexity
Data Source
AI summary
Disclosed in the present application are a signal transmission method and device. The method comprises: a receiving node receiving a request-to-send signal sent by a sending node; and the receiving node sending, according to the request-to-send signal, an allow-to-send signal to the sending node, the allow-to-send signal comprising beam information concerning N candidate beams.