Cell-Free AP Cluster Feedback Using Master AP Measurement Targeting
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Solution Overview
Problem
In cell-free communication systems, the processing loads of the CPU and wireless devices increase due to the need for channel state information feedback from all accessible access points, leading to inefficient cluster configuration, while insufficient feedback results in suboptimal cluster formation.
Innovation Solution
A method where a master access point within a cluster transmits measurement information to a wireless device to determine channel state feedback for specific target access points, reducing the need for the wireless device and CPU to measure all access points, thereby optimizing cluster configuration and load management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless device provides feedback on channel states to all accessible APs, then the cluster configuration accuracy is improved, but the processing loads of the CPU and wireless device increase
Solution Approach 1:
The patent extracts only the necessary channel state information feedback from the set of all accessible APs. Instead of requiring feedback from all APs, the system identifies and selects only those APs whose channel state information is necessary for accurate cluster configuration, thereby reducing processing load while maintaining configuration accuracy.
Solution Approach 2:
The patent applies partial action by requiring channel state information feedback from only a subset of APs rather than all accessible APs. The wireless device measures and reports channel states selectively based on criteria such as signal strength thresholds or AP identifiers provided by the CPU, achieving sufficient feedback for cluster configuration without the excessive burden of complete feedback.
2Device complexity
If the number of APs for channel state feedback is reduced, then the processing load is decreased, but the cluster configuration becomes suboptimal
Solution Approach 1:
The patent applies preliminary action by having the CPU provide measurement information and criteria to the wireless device before the actual channel state measurement and feedback process. This preliminary guidance enables the wireless device to selectively measure and report only the necessary APs, ensuring both reduced processing load and accurate cluster configuration.
Solution Approach 2:
The patent implements a structured feedback mechanism where the CPU provides measurement information to the wireless device, the wireless device measures channel states of selected APs based on this information, and then reports the channel state information back to the CPU. This closed-loop feedback ensures that the reduced set of measured APs still provides sufficient information for optimal cluster configuration.
Data Source
AI summary
A method performed by a processing apparatus of a cell-free communication system that includes a plurality of access points (APs) is provided. The method includes: transmitting, to a wireless device via a master AP among one or more APs included in a cluster associated with the wireless device, measurement information for the wireless device to determine a measurement target AP for which the wireless device measures a channel state; and receiving, as a response to the measurement information, channel state information indicating the channel state to the measurement target AP, via the master AP.