Adaptive Modulation Control Policy Switching for Base Station MCS Stability
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Solution Overview
Problem
In adaptive modulation control (AMC) systems, frequent changes in terminal states between SDMA and non-SDMA modes lead to violent fluctuations in block error ratio (BLER) and modulation and coding scheme (MCS), resulting in performance loss due to constant adjustments by the base station.
Innovation Solution
The method involves classifying signal transmission modes based on beamforming, SDMA participation, and space division groups, allowing the base station to switch between AMC policies corresponding to different modes, using independent target BLERs for each policy to manage MCS, and adjusting inter-stream interference based on real and target BLER means to stabilize MCS values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station constantly adjusts the outer-loop AMC policy in response to frequent terminal state changes between SDMA and non-SDMA modes, then the BLER can be maintained near the target BLER, but the MCS values experience violent fluctuations leading to performance loss
Solution Approach 1:
The patent applies dynamics by making the outer-loop AMC policy adaptive rather than static. The base station dynamically switches between different outer-loop policies based on the terminal's current state (SDMA or non-SDMA mode), allowing the system to respond flexibly to changing conditions while maintaining optimal performance for each specific mode rather than experiencing violent MCS fluctuations
Solution Approach 2:
The patent changes the parameter of the outer-loop AMC policy itself based on the terminal state. Different outer-loop policies are configured for different terminal states (SDMA vs. non-SDMA), and the base station switches between these policies according to the current mode. This parameter change approach prevents the violent MCS fluctuations that would occur with constant adjustment of a single policy
2Device complexity
If the base station uses a single outer-loop AMC policy for all terminal states, then the system complexity is reduced, but the MCS values cannot be effectively stabilized when terminal states change frequently
Solution Approach 1:
The patent segments the outer-loop AMC policy into multiple state-specific policies. Instead of using a single universal policy, the system divides the policy management into separate outer-loop policies for different terminal states (SDMA mode and non-SDMA mode). This segmentation allows each policy to be optimized for its specific state while maintaining overall system manageability through clear state-based switching logic
Solution Approach 2:
The patent introduces the terminal state (SDMA or non-SDMA mode) as an intermediary that mediates between the base station and the outer-loop AMC policy selection. The state acts as a selector that determines which outer-loop policy should be applied, providing a clear and manageable mechanism for switching between different policies without requiring complex real-time analysis of channel conditions
Data Source
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AI summary
Disclosed are an adaptive modulation control method and apparatus, a base station and a storage medium. In a scenario where a signal transmission mode of a terminal is changed, a base station no longer controls an MCS of the terminal according to a unified outer-loop policy; instead, the base station selects, according to the current signal transmission mode of the terminal, a second AMC policy adapted to the current scenario, and adjusts the MCS of the terminal according to an outer-loop policy in the second AMC policy.