Channel State Indication for 5G Data Transmission Reliability
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Solution Overview
Problem
In communications technologies, especially in 5G systems, the reliability of data transmission is reduced due to the use of a constant modulation and coding scheme during repeated transmissions, as channel quality changes over time, leading to ineffective retransmission reliability improvements.
Innovation Solution
A method and apparatus for channel state indication, where a terminal sends absolute or offset channel state information to a base station, allowing the base station to adjust data transmission based on current channel conditions, improving reliability and reducing signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same MCS is used for repeated transmissions, then the retransmission mechanism is simple to implement, but the reliability of data transmission is reduced due to channel quality changes over time
Solution Approach 1:
The patent applies dynamics by transitioning from a static MCS approach (same MCS for all retransmissions) to a dynamic MCS selection mechanism. The terminal device feeds back channel state information after each reception attempt, and the network device adjusts the MCS based on current channel conditions. This dynamic adaptation allows the system to respond to changing channel quality, thereby improving transmission reliability without requiring completely complex new mechanisms.
Solution Approach 2:
The patent implements feedback by having the terminal device send channel state information back to the network device after receiving data. This feedback loop enables the network device to make informed decisions about MCS selection for retransmissions. The feedback mechanism is integrated into the existing retransmission framework, allowing reliability improvement while maintaining reasonable system complexity.
2Reliability
If channel state information is frequently updated to improve transmission reliability, then data transmission reliability is enhanced, but signaling overheads increase
Solution Approach 1:
The patent applies partial action by having the terminal device feed back channel state information selectively rather than continuously. The feedback is triggered based on specific conditions such as successful reception or channel quality thresholds. This partial feedback approach provides sufficient information for MCS adjustment while avoiding the excessive signaling overhead that would result from continuous or overly frequent feedback transmissions.
Data Source
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AI summary
Embodiments of the present invention disclose a channel state indication method and apparatus, and a network device. The method includes: obtaining, by a first network device, channel state information; generating, by the first network device, channel state indication information, where the channel state indication information includes an absolute value of the channel state information or an offset value of the channel state information relative to reference channel state information; and sending, by the first network device, the channel state indication information to a second network device. In embodiments of the present invention, reliability of data transmission is improved.