Narrow Beam Resource Allocation for Interference Management
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing capacity and managing interference, especially at the edge of cells, particularly when using omnidirectional antennas, as existing solutions do not effectively address the need for high spectral reuse and interference management in complex geometries.
Innovation Solution
The system employs a method to allocate distinct transmission resources to each narrow beam, ensuring that resources used by adjacent beams within a base station and between stations are different, using a combination of frequency, time, and spatial resources, and employing digital beamforming and multibeam antennas to direct beams effectively, while also using a radio modem to serve multiple beams by alternating in time or changing weights in a phased array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple narrow beams are used to serve more users in parallel, then spectral reuse factor increases, but interference management complexity increases
Solution Approach 1:
The system segments the coverage area into multiple sectors, each served by a dedicated radio modem and set of narrow beams. This segmentation allows independent interference management in each sector, reducing overall system complexity while enabling high spectral reuse through parallel user serving across multiple sectors.
Solution Approach 2:
The patent introduces an intermediary planning layer that coordinates resource allocation across sectors and cells. This intermediary mechanism manages interference by assigning resources to beams based on their spatial relationships, reducing the complexity of direct peer-to-peer interference management while maintaining high spectral reuse.
2Productivity
If deep subsectorization is implemented to increase capacity, then throughput increases, but resource allocation planning complexity increases
Solution Approach 1:
The system divides each sector into multiple subsectors with dedicated narrow beams, enabling deep subsectorization that increases throughput by serving more users in parallel. Each subsector is independently managed by its own radio modem, simplifying resource allocation planning compared to managing all beams centrally.
Solution Approach 2:
The patent extends traditional 2D cellular planning into a 3D space-frequency-time resource allocation framework. By adding the spatial dimension of narrow beam directions to the frequency-time resource grid, the system achieves deep subsectorization while managing complexity through structured multi-dimensional resource assignment.
3Ease of operation
If omnidirectional antennas are used at cell edge, then coverage is provided, but interference from multiple base stations increases
Solution Approach 1:
Instead of using omnidirectional antennas that provide uniform coverage in all directions, the system employs narrow directional beams with locally optimized quality for each spatial direction. Each beam is tailored to serve users in its specific direction while minimizing interference to other directions, including cell edge regions.
Solution Approach 2:
The patent converts the harmful effect of signal propagation in unwanted directions into a benefit by using directional beams. The same physical principle that causes omnidirectional interference is harnessed in reverse: by deliberately directing energy only where needed, the system eliminates interference to other areas while maintaining coverage through the coordinated use of multiple directional beams.
Data Source
AI summary
A wireless communications system is described which comprises a plurality of base stations, each comprises at least one beam generating means for generating narrow spatial beams for communicating with respective subscriber devices located along a direction to which the respective narrow beam is currently directed. The system's transmission resources are allocated so that a substantial part of the resources allocated to each of the beam generating means is different from a substantial part of transmission resources allocated to any of the angularly adjacent beam generating means at the respective base station and are different from the substantial part of the resources allocated to beam generating means associated with adjacent base stations and directed towards geographical areas located in a proximity to the geographical area towards which the respective narrow beam is directed.