Wireless Communication Medium Reservation for Simultaneous SDMA Transmissions
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Solution Overview
Problem
Current Spatial Division Multiple Access (SDMA) communication systems face challenges in efficiently managing simultaneous transmissions and receptions across multiple wireless communication devices on the same frequency, leading to potential interference and coordination issues.
Innovation Solution
The implementation of a wireless communication system that reserves a communication medium for a time period, uses RTS/CTS packets to coordinate transmissions, and employs beamforming training sequences to determine optimal transmission schemes, allowing for simultaneous SDMA transmissions to multiple devices while avoiding collisions and ensuring non-overlapping responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SDMA transmissions are performed simultaneously to multiple wireless communication devices on the same frequency, then communication efficiency and spectral utilization are improved, but interference and coordination issues between devices occur
Solution Approach 1:
The patent segments the wireless communication medium by introducing virtual carriers and assigning different subsets of subcarriers to different devices. This segmentation allows simultaneous transmissions to occur on different frequency subsets, reducing interference while maintaining overall communication efficiency. Each device receives data on its allocated subcarrier subset, preventing signal collision.
Solution Approach 2:
The patent introduces an additional frequency dimension by dividing the available spectrum into multiple virtual carriers and subcarrier subsets. Instead of using a single frequency channel, the system operates across multiple frequency dimensions simultaneously, allowing multiple devices to communicate without interference while maximizing spectral utilization.
2Productivity
If multiple transmissions are performed simultaneously using different signal combinations, then data rate and throughput are improved, but difficulty in managing coordination and avoiding collisions increases
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices send acknowledgments and channel state information back to the transmitting device. This feedback enables dynamic adjustment of transmission parameters, subcarrier allocations, and power levels, allowing the system to coordinate multiple simultaneous transmissions efficiently while avoiding collisions and maintaining high data rates.
Solution Approach 2:
The patent dynamically changes transmission parameters including subcarrier assignments, power levels, and modulation schemes based on channel conditions and traffic requirements. By adjusting these parameters in real-time, the system optimizes data rates for multiple devices while maintaining coordination and avoiding interference through adaptive resource allocation.
3Measurement precision
If beamforming training sequences are used to determine optimal transmission schemes, then transmission precision and signal quality are improved, but transmission time and protocol overhead increase
Solution Approach 1:
The patent performs beamforming training and channel estimation in advance during idle periods or before data transmission begins. By completing the time-consuming training sequences beforehand, the system establishes optimal transmission parameters and beamforming weights, enabling high-precision transmissions without incurring time delays during actual data communication.
Solution Approach 2:
The patent maintains continuous channel estimation and beamforming optimization by periodically updating training sequences during ongoing transmissions. This continuous action ensures transmission precision is maintained without requiring complete retraining, reducing overhead while sustaining high signal quality through adaptive refinement of beamforming parameters.
Data Source
AI summary
Some demonstrative embodiments include devices, systems and/or methods of simultaneously communicating with a group of wireless communication devices. For example, a device may include a wireless communication unit to communicate with at least one group of a plurality of wireless communication devices over a wireless communication medium, wherein the wireless communication unit is to reserve the wireless communication medium for a time period, during which the wireless communication unit is to simultaneously transmit two or more different wireless communication transmissions to two or more wireless communication devices of the group, respectively. Other embodiments are described and claimed.