WLAN Trigger Frame Scheduling for Unassociated Station Access
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Solution Overview
Problem
In dense Wireless Local Area Network (WLAN) environments, existing technologies face challenges in efficiently managing a large number of stations and handling interference, particularly in supporting high-capacity and high-rate services like video traffic, due to limited resource allocation and interference from neighboring devices.
Innovation Solution
The method allows an unassociated station to participate in uplink multi-user simultaneous transmission by receiving a request frame and generating a response frame with timing information for a trigger frame that schedules an uplink multi-user simultaneous transmission, enabling random access to transmission resources, thereby reducing the need for single-user transmissions and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-user transmission is used to manage stations in dense WLAN environments, then each station can be served individually, but network efficiency deteriorates and power consumption increases due to limited resource allocation and wireless medium contention
Solution Approach 1:
The patent combines multiple single-user transmissions into a single multi-user simultaneous transmission by allocating multiple resource units to different stations. This merging approach allows the access point to serve multiple stations at the same time, improving network efficiency and reducing the overall number of transmissions required, thereby reducing power consumption and wireless medium contention.
Solution Approach 2:
The patent implements multi-user simultaneous transmission capability that allows a single transmission opportunity to serve multiple stations with different traffic requirements. The system provides universal service to various types of traffic (video, cloud access, offloading) through a unified multi-user transmission mechanism, making the transmission resource more versatile and efficient.
2Ease of operation
If traditional random access is allowed for unassociated stations, then stations can access the network freely, but interference from neighboring devices increases and performance deteriorates
Solution Approach 1:
The patent applies local quality by creating separate random access opportunities within the multi-user transmission framework. Different resource units are allocated for different purposes, and unassociated stations are given specific access opportunities that are localized in time and frequency, reducing their impact on other transmissions while still allowing them to access the network.
Solution Approach 2:
The patent segments the transmission resources into multiple resource units, with specific units designated for unassociated station random access. This segmentation isolates the random access traffic from other traffic types, allowing unassociated stations to access the network without causing interference to associated stations or neighboring devices.
3Productivity
If multi-user simultaneous transmission is implemented, then network capacity increases, but device complexity increases due to resource allocation and scheduling requirements
Solution Approach 1:
The patent uses preliminary action by having the access point send a trigger frame before the actual data transmission. This trigger frame contains scheduling information that pre-allocates resource units to different stations, including unassociated stations. By performing the resource allocation in advance, the system simplifies the transmission process and reduces the complexity of real-time scheduling while maintaining high network capacity.
4Adaptability or versatility
If transmission resources are allocated to unassociated stations, then network accessibility improves, but resource allocation complexity increases
Solution Approach 1:
The patent applies partial action by allocating resources to unassociated stations in a simplified manner compared to associated stations. The trigger frame includes scheduling information for unassociated stations, but the allocation is more straightforward and less complex, providing just enough resources for these stations to access the network without over-complicating the scheduling process.
Data Source
AI summary
A method implemented by an Access Point (AP) in a Wireless Local Area Network (WLAN) to facilitate an unassociated station (STA) to participate in an uplink multi-user simultaneous transmission. The method includes receiving a request frame from the unassociated STA and generating a response frame, where the response frame includes timing information regarding a future transmission, by the AP, of a trigger frame. The trigger frame includes scheduling information for scheduling an uplink multi-user simultaneous transmission, where at least one transmission resource unit allocated for the uplink multi-user simultaneous transmission allows random access. The method further includes transmitting the response frame to the unassociated STA through a wireless medium.