Spatial Reuse in Multi-RAT Wireless Networks
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing spatial reuse and minimizing interference between overlapping networks with different radio access technologies (RATs), particularly in unlicensed bands, due to difficulties in channel estimation and calibration across different RATs.
Innovation Solution
A method involving cooperative channel calibration and null-steering between transceivers of different radio technologies, where a calibration start message initiates a message exchange to determine channel state information, allowing for directional transmission and beamforming, thereby enhancing spatial reuse in overlapping networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial reuse is enabled in overlapping wireless networks with different RATs, then network capacity is improved, but interference between networks increases
Solution Approach 1:
The system performs preliminary channel calibration and estimation before actual data transmission. The calibration phase establishes channel state information and enables subsequent null-steering configurations, preventing interference issues from arising during normal operation
Solution Approach 2:
The system converts potential harmful interference into useful information by using calibration messages to measure and characterize the interference channels. This measured information is then used to configure null-steering that actively cancels the previously harmful interference
2Object-generated harmful factors
If null-steering is implemented across different RATs, then interference reduction is achieved, but channel estimation difficulty increases
Solution Approach 1:
The system introduces calibration messages as intermediary signals that facilitate channel estimation between different RATs. These specialized calibration messages serve as a common language that enables transceivers of different RATs to measure and characterize their mutual interference channels
Solution Approach 2:
The system changes the parameters of calibration messages to be compatible across different RATs, enabling universal channel estimation. The calibration messages use parameters and formats that can be processed by both WLAN and cellular transceivers, bridging the estimation difficulty gap
3Productivity
If beamforming and null-steering are used, then spatial reuse efficiency is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary calibration to pre-determine null-steering coefficients before actual spatial reuse operation. This upfront configuration simplifies subsequent transmission operations, as the complex coefficient calculations are completed in advance during the calibration phase
Solution Approach 2:
The system enables transceivers to self-configure their beamforming and null-steering parameters based on channel state information obtained during calibration. Each transceiver autonomously determines its transmission parameters without requiring complex real-time coordination with other networks
Data Source
AI summary
According to an example aspect of the present invention, there is provided a method, comprising: transmitting, by a first transceiver of a first radio technology, wherein a first device comprises the first transceiver, a calibration start message to a second device, transmitting a calibration message by a second transceiver of a second radio technology, wherein the first device comprises the second transceiver, receiving channel state information, by the first transceiver from the second device, wherein the channel state information is based on reception of the calibration message, determining at least one coefficient for null steering towards the second device based on the channel state information, and transmitting a directional message to a third device, using the at least one coefficient.