Coordinated Downlink Transmissions via AP Trigger Frames
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Solution Overview
Problem
Current Wi-Fi systems lack an effective mechanism for coordinating simultaneous downlink transmissions from multiple access points (APs) to their associated stations (STAs), leading to inefficiencies in network throughput due to interference and the inability to utilize Orthogonal Frequency Division Multiple Access (OFDMA) and Multi-User Multiple Input Multiple Output (MU-MIMO) techniques effectively across multiple APs.
Innovation Solution
The introduction of an 'AP trigger frame' that allows for coordinated simultaneous downlink transmissions from multiple APs to STAs, using fractional frequency reuse and resource allocation information to synchronize transmissions and avoid interference, enabling the use of OFDMA and MU-MIMO techniques across multiple APs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple APs transmit downlink data simultaneously to their associated STAs, then network throughput is improved, but transmission interference increases
Solution Approach 1:
The patent segments the wireless spectrum into orthogonal frequency resources (resource units) that can be allocated to different AP-STA pairs. By dividing the frequency spectrum into discrete, non-overlapping units, multiple simultaneous transmissions occur on different frequency segments without mutual interference, enabling parallel downlink transmissions from multiple APs to their associated STAs
Solution Approach 2:
The patent introduces a coordinator AP as an intermediary that manages and coordinates downlink transmissions from multiple APs. The coordinator AP allocates frequency resources and transmits trigger frames to synchronize transmissions, acting as a mediator that enables simultaneous transmissions while preventing interference through centralized coordination
2Productivity
If OFDMA and MU-MIMO techniques are used across multiple APs, then system efficiency is improved, but coordination complexity increases
Solution Approach 1:
The patent makes the coordinator AP multi-functional by having it perform both its traditional function of managing its own STAs and the additional function of coordinating downlink transmissions from other APs. The coordinator AP sends trigger frames to multiple APs simultaneously, enabling a single device to manage complex multi-AP OFDMA and MU-MIMO operations without requiring separate coordination mechanisms for each AP
3Productivity
If simultaneous downlink transmissions are coordinated across multiple APs, then network capacity is improved, but transmission synchronization difficulty increases
Solution Approach 1:
The patent applies preliminary action by having the coordinator AP transmit trigger frames to all participating APs before the actual downlink data transmissions occur. These trigger frames contain timing information and resource allocation details that prepare the APs for synchronized transmissions, ensuring that all APs are ready to transmit simultaneously at the correct time without requiring complex real-time synchronization
Data Source
AI summary
A wireless communication device, system and method. The device comprises a memory and processing circuitry coupled to the memory, the memory storing instructions, the processing circuitry to execute the instructions to decode an access point (AP) trigger frame from a coordinator AP including information on respective resource allocations to a plurality of APs (AP resource allocations) for simultaneous downlink (DL) data transmissions to a plurality of wireless stations (scheduled STAs). The processing circuitry is to cause transmission of a wireless frame to a plurality of scheduled STAs associated with the corresponding AP (associated scheduled STAs). The wireless frame includes information on a resource allocation by the coordinator AP to the corresponding AP for the simultaneous DL transmissions, and information on respective resource allocations to the associated scheduled STAs for data transmission from the corresponding AP.