Split Signal Bands in Multi-Directional Repeater Devices
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Solution Overview
Problem
Conventional cable networks face challenges in providing sufficient upstream bandwidth due to limited allocation of frequency spectrum, leading to signal attenuation and compatibility issues with legacy set-top box devices, as the existing bandwidth allocation for upstream communication is insufficient to support increased data transmission demands.
Innovation Solution
A repeater device is introduced that amplifies and manages multiple signal bands in both downstream and upstream directions, allowing for a more efficient use of the frequency spectrum by allocating specific bands for each direction, ensuring compatibility with legacy set-top boxes and enhancing bandwidth capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the upstream bandwidth allocation is increased to support increased data transmission demands, then the upstream data transmission capacity is improved, but the available frequency spectrum for downstream communication is reduced
Solution Approach 1:
The patent divides the frequency spectrum into multiple discrete bands (5-40 MHz, 40-85 MHz, 85-1000 MHz) and assigns different bands to different functions and directions. This segmentation allows simultaneous upstream and downstream communication in different frequency ranges, resolving the contradiction between upstream capacity and downstream spectrum availability.
Solution Approach 2:
The patent utilizes the frequency dimension by allocating different frequency bands for upstream and downstream communication. Instead of competing for the same frequency range, the system operates in multiple dimensional frequency slices, thereby increasing upstream capacity without reducing downstream spectrum availability.
2Productivity
If a single band is used for upstream communication, then the system design is simple, but the upstream bandwidth capacity is insufficient
Solution Approach 1:
The repeater device is divided into multiple functional modules, each handling specific frequency bands or signal directions. This modular segmentation allows the device to manage multiple bands independently, increasing upstream bandwidth capacity while keeping each module's design relatively simple and manageable.
Solution Approach 2:
The repeater device is designed with multi-functional circuitry that can handle both upstream and downstream signals across multiple frequency bands. This universal design allows a single device to perform multiple functions (amplification, filtering, signal routing) for different bands, increasing capacity without proportionally increasing complexity.
3Adaptability or versatility
If legacy set-top box devices are maintained for compatibility, then backward compatibility is preserved, but the available bandwidth for these devices is limited
Solution Approach 1:
The frequency spectrum is segmented into bands that accommodate legacy set-top box requirements (5-40 MHz) while allocating additional bands (40-85 MHz, 85-1000 MHz) for enhanced capacity. This segmentation allows legacy devices to operate in their compatible band while the system gains additional bandwidth capacity in other segments.
Solution Approach 2:
The repeater device acts as an intermediary that receives signals from legacy set-top boxes in the 5-40 MHz band, amplifies and forwards them, while also managing additional frequency bands for increased overall capacity. This intermediary function preserves legacy compatibility while enabling expanded bandwidth utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution increases upstream bandwidth capacity while maintaining compatibility with legacy set-top boxes, reducing signal attenuation and enhancing data transmission efficiency in cable networks.
Implementation Method 1
the amplifier circuit amplifies the first signal band and the second signal band
Data Source
AI summary
According to one configuration, a repeater device includes a first port, a second port, and amplifier circuitry. The first port receives a first set of multiple signal bands transmitted in a downstream direction on a communication link. The second port receives a second set of multiple signal bands transmitted in an upstream direction on the communication link; the second set of multiple signal bands include a first signal band and a second signal band. The amplifier circuitry amplifies the first set of multiple signal bands and the second set of multiple signal bands. A given signal band in the first set resides in a frequency spectrum between the first signal band and the second signal band of the second set. Communications in the given signal band control at least one set-top box coupled to the communication link in the downstream direction.