Grant-Free Uplink Data Retransmission Mode Switching
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Solution Overview
Problem
The grant-free uplink data transmission mode in 5G systems often fails to match the current uplink channel conditions, resulting in low transmission reliability, especially during retransmissions, as the terminal device lacks scheduling signaling from the network device.
Innovation Solution
The method involves using a different transmission mode for retransmissions, such as switching between various MIMO transmission modes, antenna ports, precoding matrices, beams, or transmission powers, to improve reliability, allowing the terminal device to autonomously adjust its transmission parameters without network scheduling grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free uplink data transmission mode is used, then transmission speed and automation are improved, but transmission reliability deteriorates
Solution Approach 1:
The patent applies dynamics by enabling the terminal device to dynamically switch between different transmission modes (grant-free and grant-based) based on current channel conditions and transmission requirements. This dynamic adaptation allows the system to maintain high productivity when using grant-free mode while ensuring reliability by switching to grant-based mode when needed, particularly for retransmissions.
Solution Approach 2:
The patent implements parameter changes by modifying transmission parameters such as switching between transmission modes, adjusting MIMO configurations, changing antenna ports, and modifying precoding matrices based on channel conditions. These parameter changes enable the system to optimize both productivity and reliability by adapting to varying uplink channel states.
2Device complexity
If grant-free transmission mode is used, then device complexity is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine channel conditions, select appropriate transmission modes, and perform retransmissions without requiring network scheduling grants. This self-service capability maintains low device complexity while improving reliability through intelligent autonomous decision-making based on channel state assessment.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device monitors uplink channel conditions and uses this feedback to adaptively adjust transmission parameters. The device assesses channel quality and automatically switches between grant-free and grant-based modes or adjusts MIMO parameters based on feedback from channel state measurements, thereby maintaining simplicity while enhancing reliability.
3Device complexity
If transmission mode is fixed, then device complexity is reduced, but adaptability to channel conditions deteriorates
Solution Approach 1:
The patent applies dynamics by transforming the fixed transmission mode into a dynamic one that can adapt to changing channel conditions. The terminal device continuously assesses uplink channel state and dynamically adjusts transmission parameters including mode selection, MIMO configuration, antenna ports, and precoding matrices, thereby achieving high adaptability without significantly increasing device complexity through intelligent algorithms.
Solution Approach 2:
The patent implements parameter changes by enabling the terminal device to modify multiple transmission parameters based on channel conditions. These changes include switching between transmission modes, adjusting MIMO parameters, changing antenna ports, and modifying precoding matrices. This parameter adaptability allows the system to respond to varying channel conditions while maintaining reasonable device complexity through efficient parameter management.
Data Source
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AI summary
The embodiments of the present application provide a method and device for transmitting data, said method comprising: a first device using a first transmission means to send first data to a second device, said first data being data sent autonomously by said first device; the first device using a second transmission means to retransmit the first data in full or in part, the first transmission means being different from the second transmission means. The method for transmitting data of the embodiments of the present application improves transmission reliability during retransmission.