Simultaneous DiL and MU UL Transmission with Pre-Correction
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Solution Overview
Problem
The existing 802.11ax MU transmission scheme is not adapted for bandwidth-demanding communication services like video-based applications, leading to increased air time, medium access time, and radio resources, and suffers from interference issues due to competition between Single User (SU) and Multi User (MU) schemes in high-density environments.
Innovation Solution
The proposed solution involves triggering DiL and MU UL frames simultaneously by the AP, with pre-correction parameters computed based on the triggering frame to ensure synchronization and orthogonality, allowing for simultaneous MU UL and P2P transmissions on adjacent channels, reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous MU UL and P2P transmissions are performed on adjacent channels, then spectrum efficiency and data throughput are improved, but interference between transmissions occurs
Solution Approach 1:
The patent applies preliminary anti-action by computing pre-correction parameters based on the triggering frame before transmissions occur. These parameters pre-compensate for frequency and timing offsets, preventing interference between MU UL and P2P transmissions before they can occur during the actual transmission phase
Solution Approach 2:
The patent implements preliminary action by having the AP send a triggering frame that allocates resource units and enables stations to compute pre-correction parameters in advance. This preparation ensures that when simultaneous transmissions occur, they are already synchronized and orthogonal, eliminating interference
2Reliability
If pre-correction parameters are computed based on triggering frame, then synchronization and orthogonality are ensured, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling each station to autonomously compute its own pre-correction parameters based on the triggering frame it receives. The AP provides the necessary information in the triggering frame, and each station independently performs the computations without requiring complex centralized control, thus maintaining reliability while limiting complexity increases
Data Source
AI summary
The present invention concerns a transmission system where DiL and MU UL scheme are triggered by the AP simultaneously. According to a first aspect of the invention, the data frame sent in DiL mode by a station in response to an AP triggering frame are emitted according to the synchronization scheme adopted in MU scheme. This means that pre-correction parameters are computed based on the triggering frame from the AP for the transmission of the data frame. According to a second aspect of the invention, the return frame from the destination station of a DiL transmission to the source station, typically an acknowledge frame, when present, is transmitted using pre-correction parameters computed by the destination of the DiL transmission. These pre-correction parameters may be computed based on the received data frame from the source station of the DiL transmission or, when available, based on a previous frame received from the AP.