Transmission Mode Selection Control for Wireless Networks
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Solution Overview
Problem
Current communication networks face challenges in optimally selecting transmission modes, particularly in scenarios with fast-changing spatial properties and high Doppler spread, leading to suboptimal performance in areas like dense urban environments where user-specific beamforming may not be effective.
Innovation Solution
A control procedure that tracks metrics reflecting spatial and frequency properties of the radio channel, using autocorrelation of beamforming vectors and Doppler spread, to decide between transmission modes such as beamforming and MIMO, with threshold-based switching and consideration of handover processing to avoid improper mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user-specific beamforming is used to improve network performance, then spectral efficiency is improved, but reliability deteriorates in scenarios with fast-changing spatial properties and high Doppler spread
Solution Approach 1:
The patent implements dynamic transmission mode selection that adapts between beamforming and MIMO modes based on real-time channel conditions. The system continuously monitors spatial properties and Doppler spread to dynamically switch transmission modes, ensuring optimal performance across varying mobility scenarios and channel conditions.
Solution Approach 2:
The system changes transmission mode parameters based on measured channel characteristics. When Doppler spread exceeds a threshold or spatial correlation decreases below a threshold, the system transitions from beamforming mode to MIMO mode, effectively changing operational parameters to maintain reliability while preserving spectral efficiency.
2Adaptability or versatility
If transmission mode switching is performed frequently to adapt to changing channel conditions, then adaptability is improved, but stability deteriorates due to improper mode changes
Solution Approach 1:
The patent applies preliminary anti-action by suspending transmission mode switching during handover processing. The system proactively prevents mode changes when handover is detected, avoiding improper switching that would occur due to transient channel variations during handover. This counter-measure maintains stability by blocking potentially harmful mode transitions before they occur.
Solution Approach 2:
The system uses feedback mechanisms to monitor transmission mode performance and channel conditions continuously. By evaluating whether mode switching improves or degrades performance based on ongoing measurements, the system provides feedback control that maintains stability while preserving adaptability to genuine channel condition changes.
3Productivity
If transmission mode selection is made during handover processing to optimize performance, then productivity is improved, but reliability deteriorates due to improper mode changes
Solution Approach 1:
The system applies preliminary anti-action by detecting handover processing states and proactively suspending transmission mode switching during this period. This prevents improper mode selections that would result from channel measurements taken during the transient handover state, thereby maintaining reliability while allowing performance optimization during stable connection periods.
Data Source
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AI summary
An apparatus comprising at least one processing circuitry, and at least one memory for storing instructions to be executed by the processing circuitry, wherein the at least one memory and the instructions are configured to, with the at least one processing circuitry, cause the apparatus at least: to obtain, over a series of times, information related to at least one of spatial properties and frequency properties of a channel used in a directional communication between a communication network control element or function and a communication element, to quantify the information related to at least one of spatial properties and frequency properties into a metric, to track whether the metric is smaller than a first threshold or greater than a second threshold during a predetermined period of time, and to decide to use a first transmission mode or a second transmission mode on the basis of a result of the tracking.