Millimeter Wave Hotspot Backhaul Resource Scheduling
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Solution Overview
Problem
The growing capacity demand in cellular networks, driven by increased spectral efficiency and densification of cellular networks, requires enhanced backhaul capabilities, particularly in dense urban environments, where rolling out fiber is cost-prohibitive, and existing millimeter wave systems face challenges in mesh network operation due to high directionality and interference.
Innovation Solution
A Millimeter Wave Hotspot (mmH) backhaul system utilizing highly directional millimeter wave links with a mesh topology, employing resource scheduling mechanisms, adjustable preambles, and modified beacon and data transmission protocols to optimize communication efficiency and interference mitigation, based on IEEE 802.11ad standards with enhancements for longer range communications and low latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber is rolled out to all new nodes, then backhaul capability is improved, but cost becomes prohibitive
Solution Approach 1:
The patent replaces the mechanical/fiber-based backhaul infrastructure with a wireless millimeter wave communication system. Small cells use directional mmWave antennas to establish wireless backhaul links, eliminating the need for expensive fiber deployment while achieving comparable or superior backhaul capability through high-frequency spectrum utilization.
Solution Approach 2:
The patent utilizes millimeter wave frequencies (higher frequency parameter) to enable backhaul communication. By operating at mmWave frequencies rather than traditional fiber optics, the system achieves high-capacity wireless backhaul with lower infrastructure costs, leveraging the high frequency spectrum to provide bandwidth-equivalent to fiber.
2Productivity
If cell density is increased, then capacity demand is addressed, but backhaul capability requirements increase
Solution Approach 1:
The patent segments the backhaul network into distributed small cells connected via wireless mmWave links. Each small cell operates as an independent node with its own directional antennas, allowing localized capacity enhancement while maintaining flexible wireless backhaul connectivity. This segmentation enables density increase without proportionally increasing backhaul infrastructure requirements.
Solution Approach 2:
The patent transitions from two-dimensional fiber infrastructure deployment to three-dimensional wireless spatial utilization. By using directional mmWave beams that can be electronically steered, the system creates volumetric communication pathways, allowing multiple small cells to establish backhaul links through three-dimensional space rather than being constrained by ground-based fiber routing.
3Ease of manufacture
If highly directional millimeter wave links are used, then backhaul cost is reduced, but interference and directionality challenges increase
Solution Approach 1:
The patent employs dynamic beamforming and directional antenna adjustment to adapt to changing network conditions. The system can dynamically steer mmWave beams to avoid interfering with other directional links, adjusting transmission directions in real-time to minimize interference while maintaining cost-effective wireless backhaul deployment.
Solution Approach 2:
The patent converts the potential harm of mmWave interference into a benefit by using interference avoidance as a design principle. The highly directional nature of mmWave links, which could cause interference, is instead leveraged to create isolated communication channels that naturally avoid interference with neighboring cells, turning a potential problem into a solution for network capacity.
4Productivity
If resource scheduling is optimized, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements periodic resource scheduling where small cells transmit in alternating time slots. This periodic transmission pattern simplifies the scheduling mechanism by creating regular, predictable transmission cycles, while still achieving high transmission efficiency through time-division multiplexing of the mmWave spectrum across multiple small cells.
Data Source
AI summary
A method and apparatus are disclosed for communication in a Millimeter Wave Hotspot (mmH) backhaul system which uses mesh nodes. A mmH mesh node may receive a control signal which includes a total number of available control slots. The mesh node may determine the number of iterations of a resource scheduling mechanism that can be made during the time period of all available control slots, based on the number of neighbor nodes for the mesh node. Further, the mesh node may receive control slot information, including information about traffic queues and priorities. The mesh node may then perform resource scheduling using the resource scheduling mechanism based on the currently received control slot information and control slot information received in previous iterations of resource scheduling. The mesh node may also adjust a preamble based on a time between a last packet transmission and a current packet transmission to a neighboring node.