Multi-Link Wireless AP Channel Statistics Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 802.11be standard for multi-link devices lacks a mechanism to leverage statistical correlations between different links, leading to inefficient channel estimation and performance degradation due to independent processing of each link, even when they share common channel characteristics.
Innovation Solution
The proposed solution involves a multi-link wireless access point that shares channel statistics across links, using training correlation data to improve MIMO channel estimation by exploiting commonalities between links, such as average delay, Doppler shift, and beam direction, thereby enhancing receiver performance and throughput without increasing RF transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent channel estimation is performed for each link, then device complexity is reduced and ease of operation is improved, but measurement precision and reliability deteriorate due to loss of statistical correlations
Solution Approach 1:
The patent merges channel estimation processes across multiple wireless links by combining training data from different links. The receiver collects training data from multiple links and performs joint channel estimation, leveraging statistical correlations between links to improve accuracy. This combines previously separate estimation processes into a unified approach that exploits inter-link relationships.
Solution Approach 2:
The patent applies universal channel statistics derived from one link to improve channel estimation on other links. By identifying common statistical properties (such as Doppler spread, delay spread, and spatial correlation) that are shared across multiple links, the system uses a universal estimation approach that benefits all links simultaneously rather than treating each link independently.
2Reliability
If channel statistics are shared across multiple links, then measurement precision and reliability improve, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent performs preliminary channel estimation and statistics extraction during initial training phases before actual data transmission. By pre-computing channel statistics and correlation parameters during the training period, the system prepares reusable information that can be applied across multiple links without requiring complex real-time processing during active communication, thus improving reliability while managing complexity.
3Productivity
If independent processing is used for each link, then ease of operation is improved and device complexity is reduced, but productivity decreases due to inefficient use of channel resources
Solution Approach 1:
The patent merges resource allocation and scheduling decisions across multiple links by utilizing shared channel statistics. The system jointly optimizes resource allocation for multiple links based on correlated channel conditions, improving overall spectral efficiency and throughput. This coordinated approach allows better utilization of available wireless resources compared to independent link processing.
Solution Approach 2:
The patent implements feedback mechanisms where channel statistics estimated from one link are used to inform processing on other links. The receiver feeds back correlation information and statistical parameters to the transmitter, enabling adaptive modulation and coding decisions that improve throughput across the multi-link system. This feedback loop allows the system to dynamically adjust based on observed channel correlations.
Data Source
AI summary
Apparatus and methods for operating multiple link premises devices in a wireless network. In one embodiment, premises devices such as a wireless gateway, Access Point (AP) or user devices use Wireless Local Area Network (WLAN) technology for the transmission of data on multiple links operating on different frequencies. The disclosed apparatus and methods provide a solution to share channel statistic or similar data across the different links, such as for link performance improvement via more optimal MIMO operation. In one implementation, large-scale channel statistics are shared via the pre-amble or mid-amble of a frame across multiple links between an AP and a user device to enhance receiver performance. In another embodiment, the channel statistics are shared between multiple AP devices which can coordinate with each other, and/or are made specific to individual client devices, in order to enhance receiver performance.