Trigger Frame Client Grouping for Low-Latency Industrial Wi-Fi
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Solution Overview
Problem
Conventional trigger frames in industrial wireless communication are limited to a certain number of clients, necessitating multiple transmissions, which increases latency and delay, particularly in environments with a large number of industrial devices.
Innovation Solution
Grouping user equipment into client groups based on predefined resource units and utilizing time division to schedule communication, reducing the number of trigger frame transmissions by allowing different client groups to communicate across different time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple trigger frames are transmitted to accommodate a large number of clients, then all clients can be scheduled for communication, but the transmission time and latency increase
Solution Approach 1:
The patent segments the plurality of client devices into multiple client groups, where each group is assigned to a specific resource unit. This segmentation allows the access point to transmit a single trigger frame that schedules multiple client groups simultaneously, rather than transmitting multiple separate trigger frames for each group. The segmentation resolves the contradiction by organizing clients into manageable groups that can be addressed efficiently in parallel.
Solution Approach 2:
The patent introduces a new dimension of organization by assigning client groups to different resource units (spatial/frequency dimension) rather than scheduling them sequentially in time. This dimensional change allows multiple client groups to be scheduled within a single trigger frame transmission, transforming the problem from a time-sequential approach to a parallel multi-dimensional approach, thereby reducing transmission time and latency.
2Quantity of substance
If trigger frames are transmitted multiple times to schedule different groups of clients, then all client groups can communicate, but the number of transmissions increases system complexity
Solution Approach 1:
The patent merges multiple client groups into a single trigger frame transmission by allocating different resource units to different client groups within the same trigger frame. This consolidation reduces the number of separate trigger frame transmissions from multiple to one, thereby reducing system complexity while still serving all client groups. The merging principle allows the access point to handle multiple groups efficiently in a unified transmission.
3Productivity
If a single trigger frame schedules many clients, then transmission efficiency improves, but resource unit allocation becomes more complex
Solution Approach 1:
The patent segments the large plurality of clients into smaller client groups, each assigned to a specific resource unit. This segmentation simplifies the resource unit allocation management within the single trigger frame, as each resource unit handles a manageable group of clients rather than the entire plurality. The segmentation maintains high transmission efficiency while reducing the complexity of allocating and managing resources across all clients.
Data Source
AI summary
A method of communicating with a plurality of user equipment is provided. The method includes creating two or more client groups by grouping the plurality of user equipment, transmitting a trigger frame to the client groups, and receiving a response from a first user equipment from a first client group based on the trigger frame. Each client group from the two or more client groups includes one or more user equipment from the plurality of user equipment and a group identifier. The trigger frame includes client group information and a resource unit allocation information indicative of an allocation of resource units within the two or more client groups. The client group information includes one or more associations of one or more user equipment to a client group from the two or more client groups and a group transmission offset associated with the two or more client groups.