5G RAN Code Rate Adaptation via Rank Indicator Feedback
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Solution Overview
Problem
Existing radio access network (RAN) technologies face inefficiencies in rate adaptation due to the disconnect between determined code rates and the actual code rates supported by user equipment (UE), leading to increased transmission loss and resource usage.
Innovation Solution
A method and apparatus for enhanced rate adaptation in a RAN node, which involves determining code rates based on changing rank indicators and channel quality information, allowing for dynamic adjustment of communication parameters to better match the UE's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the RAN node uses the same error rate to determine code rate after rank change, then the code rate determination process remains simple, but the determined code rate becomes inaccurate and exceeds UE capabilities
Solution Approach 1:
The patent applies dynamics by making the code rate determination process adaptive rather than static. When rank indicator changes are detected, the system dynamically adjusts the code rate selection methodology, transitioning from using historical error rates to using real-time channel quality indicators and rank-specific parameters, ensuring code rate accuracy matches current UE capabilities
Solution Approach 2:
The patent implements feedback by continuously monitoring rank indicator changes and using this information to adjust code rate determination. The system receives feedback about rank changes from the UE and uses this feedback to select appropriate code rates from rank-specific tables or apply rank-specific adjustments, ensuring the code rate remains accurate despite changing communication conditions
2Speed
If the RAN node determines code rate based on outdated error rate after rank change, then processing remains fast, but transmission loss increases due to mismatched code rate
Solution Approach 1:
The patent applies preliminary action by pre-organizing code rate determination resources according to rank indicators. The system maintains separate code rate tables or parameter sets for different rank levels, so when a rank change occurs, the RAN node can immediately switch to the appropriate pre-prepared code rate selection methodology without complex real-time calculations, maintaining both speed and accuracy
Solution Approach 2:
The patent implements parameter changes by adjusting the code rate selection parameters based on the current rank indicator. When the rank changes, the system changes the parameters used for code rate determination, such as switching between different code rate tables or applying different adjustment factors, ensuring the code rate matches the current channel conditions and UE capabilities
3Productivity
If the RAN node uses higher code rate after rank increase, then data transmission capacity increases, but transmission loss increases when channel quality has not improved
Solution Approach 1:
The patent applies parameter changes by adjusting the code rate parameter based on both the rank indicator and current channel quality measurements. When rank increases but channel quality has not improved, the system changes the code rate parameter to reflect the actual channel conditions rather than assuming higher rank automatically enables higher code rates, preventing transmission losses while still allowing capacity increases when appropriate
Data Source
AI summary
A method for enhanced rate adaptation by a radio access network (RAN) node includes: determining a first code rate, for sending one or more messages to a user equipment (UE) before a first time, based at least in part on a first rank and a first message error rate; sending the one or more messages to the UE before the first time using the first code rate; receiving channel quality information and a second rank from the UE at the first time, wherein the second rank is different than the first rank; determining a second code rate, for sending one or more messages to the UE after the first time and before a second time, based at least in part on the received channel quality information and second rank; and sending the one or more messages to the UE, after the first time and before a second time, using the second code rate.