Multi-layer Beamforming for Millimeter-wave MIMO Resource Reuse
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Solution Overview
Problem
Conventional beamforming techniques in millimeter-wave multiple-input/multiple-output (MIMO) systems do not optimize the utilization of resources, leading to inefficient communication and higher overhead, as they use different time-frequency resources for different antennas or antenna arrays.
Innovation Solution
The described techniques allow an evolved NodeB (eNB) to identify and select beamforming directions for simultaneous communications using the same time-frequency resources, based on performance metrics such as signal-to-noise ratio (SNR) and angle of departure, enabling interference cancellation and nulling to improve resource reuse and system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different time-frequency resources are used for different antenna ports, then interference between antenna ports is reduced, but resource utilization efficiency deteriorates and system overhead increases
Solution Approach 1:
The patent merges the resource allocation of multiple antenna ports by allowing them to share the same time-frequency resources. Instead of assigning separate resources to each antenna port, the system enables simultaneous transmission on overlapping resources with different spatial directions, thereby improving resource utilization while managing interference through beamforming techniques.
Solution Approach 2:
The patent introduces a spatial dimension to resolve resource conflicts. By utilizing beamforming to create direction-specific transmissions, the system allows multiple antenna ports to share time-frequency resources by separating them in the spatial domain. This adds a new dimension (spatial direction) to the traditional time-frequency resource allocation paradigm.
2Productivity
If the same time-frequency resources are reused for multiple antenna ports, then resource utilization efficiency improves, but interference between antenna ports increases
Solution Approach 1:
The patent resolves the interference issue by transitioning from a two-dimensional resource allocation (time-frequency) to a three-dimensional approach that includes spatial direction. Beamforming creates direction-specific channels, allowing the same time-frequency resources to be reused by different antenna ports pointing in different directions, thus enabling resource reuse while controlling interference through spatial separation.
Solution Approach 2:
The patent applies local quality by making each antenna port's transmission direction-specific through beamforming. Each antenna port transmits with optimized spatial characteristics tailored to its specific receiver, allowing efficient resource reuse while minimizing interference to other antenna ports through directional confinement of energy.
3Reliability
If beamforming directions are optimized for each receiver, then communication performance improves, but system complexity increases
Solution Approach 1:
The patent creates a universal beamforming framework that handles multiple antenna ports and receivers through a common set of principles and procedures. The same beamforming optimization process applies regardless of the number of antenna ports or receivers, providing a scalable solution that maintains performance while controlling complexity through standardized multi-functional procedures.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A base station may identify two (or more) beamforming directions associated with simultaneous communications to a set of receivers. Each receiver may be associated with a different one of the two beamforming directions. The base station may schedule resources for simultaneous communications with the set of receivers based on the identified two beamforming directions. The base station may schedule simultaneous transmissions to the set of receivers using the scheduled resources.