Simultaneous Uplink Transmission via Synchronization Data Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless local area network (WLAN) technologies face limitations in simultaneous uplink transmission, where multiple devices cannot transmit data simultaneously due to interference and synchronization challenges, leading to reduced throughput and efficiency in MIMO communication channels.
Innovation Solution
The implementation of a method and apparatus that utilize an access point with multiple antennas to generate synchronization data units, specify spatial streams for communication devices, and estimate the MIMO communication channel using training fields, allowing for simultaneous transmission of data units from multiple devices while controlling power and acknowledging received frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices transmit data simultaneously in uplink direction, then data throughput is improved, but interference and synchronization challenges increase
Solution Approach 1:
The patent segments the uplink transmission by allocating specific time periods (uplink multi-user MIMO time periods) dedicated to simultaneous transmissions from multiple stations. This temporal segmentation allows multiple devices to transmit simultaneously without causing interference to other transmissions, thereby improving throughput while controlling interference through structured time division.
Solution Approach 2:
The access point performs preliminary actions by generating and transmitting synchronization data units before the actual data transmission. These synchronization units include training fields that enable channel estimation and spatial stream identification in advance, preparing the system to handle simultaneous transmissions from multiple devices without interference issues.
2Productivity
If multiple devices transmit data simultaneously, then efficiency in MIMO communication channels is improved, but synchronization challenges increase
Solution Approach 1:
The patent implements preliminary synchronization actions by including synchronization data units with training fields at the beginning of each uplink multi-user MIMO time period. These training fields enable the access point to estimate MIMO communication channels and identify spatial streams from different stations before actual data transmission begins, simplifying the synchronization process.
Solution Approach 2:
The access point uses feedback from training fields in received signals to estimate channel conditions and adjust spatial stream allocation. This feedback mechanism allows the system to adapt to changing channel conditions and maintain efficient simultaneous transmissions without increasing synchronization complexity.
3Object-affected harmful factors
If synchronization data units are generated to schedule simultaneous transmission, then interference is controlled, but device complexity increases
Solution Approach 1:
The access point implements a universal synchronization mechanism that handles multiple stations simultaneously using the same procedural framework. The synchronization data unit structure and processing method remain consistent regardless of the number of transmitting stations, allowing the access point to manage interference control without proportionally increasing complexity as more devices are added.
Data Source
AI summary
A synchronization data unit is generated by an access point. The synchronization data unit is for scheduling subsequent simultaneous transmission of a plurality of data units by multiple communication devices. An estimate of a MIMO communication channel is generated using a plurality of training fields included in a first portion of a signal, wherein the signal corresponds to the plurality of data units transmitted simultaneously from the respective communication devices via respective sets of sets of spatial streams. Data in a second portion of the signal is decoded using the estimate of the MIMO communication channel, wherein the data in the second portion of the signal corresponds to data included in the plurality of data units.