TDD Configuration Control for Faster Link Adaptation in Periodic Fading
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Solution Overview
Problem
Existing link adaptation algorithms struggle to efficiently adapt to periodic fading conditions in wireless communication networks, leading to suboptimal transmission parameters and reduced system efficiency, particularly in scenarios where fading events occur on a time scale similar to or shorter than the algorithm's time constant.
Innovation Solution
Adapting the Time Division Duplexing (TDD) configuration of a Transmission Reception Point (TRP) to reduce the link adaptation time constant, thereby improving responsiveness to periodic fading by increasing feedback exchange opportunities and adjusting transmission parameters more frequently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a jump algorithm is used for link adaptation, then the algorithm responds well to sudden decreases in channel quality, but the long time constant associated with climbing back to a more aggressive target level makes it difficult to handle periodic fading scenarios
Solution Approach 1:
The patent applies dynamics by making the TDD configuration adjustable rather than fixed. The system dynamically adapts the TDD configuration based on detected periodic fading conditions, switching between different configurations to optimize link adaptation performance. This resolves the contradiction by allowing the system to change its operational characteristics in response to changing channel conditions.
Solution Approach 2:
The patent changes the parameter of TDD configuration to reduce the LA time constant. By detecting periodic fading and triggering a change in TDD configuration, the system modifies the feedback exchange opportunities and transmission parameter adjustment rates. This parameter change enables the link adaptation algorithm to respond faster to periodic fading events while maintaining reliability.
2Speed
If the TDD configuration is adapted to reduce LA time constant, then responsiveness to periodic fading improves, but the complexity of configuration management increases
Solution Approach 1:
The patent uses feedback mechanisms where the network node detects periodic fading conditions and triggers appropriate TDD configuration changes. The system monitors link quality indicators and fading patterns, then adjusts the TDD configuration accordingly. This feedback loop enables responsive adaptation to periodic fading while managing complexity through automated detection and trigger-based control.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple TDD configurations with different LA time constants. When periodic fading is detected, the system can quickly switch to a pre-configured appropriate TDD configuration rather than creating new configurations on-the-fly. This reduces the complexity of real-time configuration management while maintaining high responsiveness.
Data Source
AI summary
A Transmission Reception Point (TRP 22) of a wireless communication network (10) operates with a Time Division Duplexing (TDD) configuration for downlink and uplink communications, and a network node (18) detects a trigger condition for adapting the TDD configuration, with the trigger condition at least including detection of an impairment condition arising from periodic fading on one or more of the radio links between the TRP and User Equipments (UEs 12). For example, the network node (18) determines that the impairment condition exists and satisfies one or more additional criteria, and, in response, adapts the TDD configuration of the TRP, to improve the responsiveness of Link Adaptation (LA) by the TRP (22). An advantageous recognition underlying responsive adaptation of the TDD configuration is that the TDD configuration of the TRP (22) influences the LA time constant or convergence time of the LA algorithm used by the TRP (22).