Multi-STA Training Sequence Transmission via One Trigger Frame
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MIMO technologies face high signaling overheads due to frequent channel training requests, especially as the number of access points (APs) or stations (STAs) increases, leading to inefficient channel estimation processes.
Innovation Solution
A method where a single trigger frame is broadcast to multiple stations and access points, indicating a time sequence for channel sounding frames, reducing the need for individual training requests and significantly cutting down on signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual training requests are sent to each station for channel estimation, then channel estimation accuracy is maintained, but signaling overhead increases significantly
Solution Approach 1:
The patent combines multiple individual training requests into a single group training request that can trigger channel estimation for multiple stations simultaneously. Instead of sending separate TRQ frames to each STA, the AP sends one group TRQ that contains identifiers of multiple STAs, allowing them to all participate in the channel estimation process using a shared training sequence, thereby reducing signaling overhead while maintaining estimation accuracy.
Solution Approach 2:
The training sequence is designed to serve multiple stations simultaneously rather than being dedicated to a single STA. The group training request enables a universal training mechanism where one training sequence can be used by multiple STAs for their respective channel estimations, making the training process multi-functional and reducing the total number of training sequences and requests needed.
2Measurement precision
If frequent channel training requests are sent to maintain channel state information, then channel estimation accuracy is improved, but system efficiency deteriorates due to high overhead
Solution Approach 1:
The patent merges multiple channel estimation operations into a single coordinated event triggered by one group training request. Multiple STAs perform channel estimation simultaneously based on the same training sequence, reducing the frequency of individual training requests and minimizing the impact on system productivity while maintaining accurate channel state information.
3Reliability
If multiple access points and stations perform individual channel sounding, then channel state information is obtained for each device, but the complexity of the training process increases
Solution Approach 1:
The patent combines the training processes of multiple APs and STAs into a coordinated group operation. The group training request mechanism allows multiple devices to participate in a unified training sequence, reducing the complexity of managing individual training sessions for each device while ensuring that channel state information is obtained for all participants.
Solution Approach 2:
The group training request acts as an intermediary mechanism that coordinates the training process among multiple APs and STAs. It provides a centralized control structure where the initiating AP can manage the training sequence distribution and collection of channel estimation results from multiple devices, simplifying the overall process complexity.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
This application provides a training sequence transmission method and apparatus. The method includes: A first AP broadcasts a trigger frame, where the trigger frame indicates a time sequence of separately sending channel sounding frames by N STAs, and N is an integer greater than 1. The first AP receives the channel sounding frames sequentially sent by the N STAs, where one channel sounding frame includes one or more training sequences. In this solution, only one trigger frame needs to be sent, so that the N STAs can be triggered to separately report channel sounding frames to M + 1 APs. However, in the conventional technology, each AP needs to send one channel training request to each STA, that is, N x (M + 1) channel training requests are sent in total, to trigger each STA to report a training sequence. Therefore, this solution can significantly reduce signaling overheads.