Multi-Beam LBT for Millimeter Wave MU-MIMO Interference
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Solution Overview
Problem
In millimeter wave multi-user multiple-input multiple-output (MU-MIMO) communications, the challenge lies in managing interference between independent communication streams, which can lead to self-interference, and existing listen before talk (LBT) procedures may not effectively handle simultaneous transmissions across multiple beams.
Innovation Solution
A method where a wireless device performs multiple LBT procedures based on different timers for various beams, allowing simultaneous MU-MIMO transmissions by ensuring that each beam is clear before data is sent, thereby avoiding interference and optimizing beam usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single LBT procedure is used for all beams, then the procedure is simple to implement, but it cannot handle simultaneous transmissions across multiple beams effectively
Solution Approach 1:
The patent divides the single LBT procedure into multiple separate LBT procedures, with each procedure associated with a specific beam. This segmentation allows independent channel assessment for each beam, enabling simultaneous transmissions across multiple beams while maintaining manageable complexity through modular design
2Productivity
If multiple LBT procedures are performed for different beams, then simultaneous MU-MIMO transmissions are enabled, but the device complexity increases
Solution Approach 1:
The patent implements preliminary actions by performing LBT procedures before actual data transmissions. Each beam performs its LBT assessment in advance, allowing the system to prepare multiple simultaneous transmissions without interference. This preliminary channel assessment enables the complex multi-beam operation to be managed systematically
Solution Approach 2:
The patent introduces dynamic management of multiple LBT procedures with timers that can be started, stopped, or restarted based on transmission needs. The system dynamically adjusts which beams are active and when LBT procedures should be performed, optimizing the balance between simultaneous transmission capability and system complexity
3Reliability
If beams are cleared individually before transmission, then interference is avoided, but transmission time is increased
Solution Approach 1:
The patent performs LBT procedures as preliminary actions before data transmissions. By completing channel assessments in advance for all intended beams, the system ensures interference-free transmissions while minimizing the time overhead, as the LBT procedures are completed before the actual data transmission window begins
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A wireless device may include a plurality of antenna panels. The wireless device may perform a first listen before talk (LBT) procedure for a configuration of a first antenna panel based at least in part on a first LBT timer and may perform a second LBT procedure for a configuration of a second antenna panel based at least in part on a second LBT timer. The wireless device may then perform a multiple user multiple-input multiple-output (MU-MIMO) transmission. The MU-MIMO transmission may include transmitting a first packet to a second wireless device using the configuration of the first antenna and transmitting a second packet to a third wireless device using the configuration of the second antenna.