Tier-Based Channel Bonding for DOCSIS 4.0 Power Constraints

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Solution Overview

Problem

The increased upstream path-loss at higher frequencies in DOCSIS 4.0 results in lower received power spectral density and reduced spectral efficiency due to the same maximum modem transmit power as DOCSIS 3.1, leading to suboptimal capacity and interference issues.

Innovation Solution

Forming DOCSIS 4.0 upstream/downstream channel bonding groups based on service tiers, optimizing channel selection and resource allocation to maintain optimal power spectral density and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the upstream spectrum is extended to higher frequencies in DOCSIS 4.0, then the upstream capacity and number of supported OFDMA channels increase, but the upstream path-loss increases resulting in lower received power spectral density

Engineering Contradiction:

Improveupstream capacityVSAvoidreceived power spectral density

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the channel bonding configuration based on frequency-dependent path-loss characteristics. The CMTS modifies transmission parameters (channel allocation, bonding groups) to compensate for increased path-loss at higher frequencies, thereby maintaining adequate received power spectral density while utilizing the extended upstream spectrum for increased capacity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the same maximum modem transmit power is maintained from DOCSIS 3.1, then device compatibility is preserved, but the received power spectral density decreases due to increased path-loss at higher frequencies

Engineering Contradiction:

Improvedevice compatibilityVSAvoidreceived power spectral density

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by implementing frequency-specific power spectral density management. Different channel bonding configurations and power allocations are applied to different frequency ranges within the upstream spectrum. This allows the system to maintain device compatibility through standardized interfaces while optimizing received power spectral density for each frequency band according to its specific path-loss characteristics.

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If channel bonding groups are formed without considering service tiers, then spectrum utilization is maximized, but spectral efficiency decreases due to suboptimal channel allocation

Engineering Contradiction:

Improvespectrum utilizationVSAvoidspectral efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent applies dynamics by implementing dynamic channel bonding group formation that adapts to service tier requirements. The CMTS dynamically allocates channels to bonding groups based on real-time considerations of user subscription levels, channel conditions, and service requirements. This dynamic approach ensures both optimal spectrum utilization and spectral efficiency by matching channel allocations to specific service tier needs rather than using static allocation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260032550A1Methods and systems for determining channel bonding groups

Publication Date: 2026.01.29 COMCAST CABLE COMM LLC

AI summary

Methods, apparatuses, and systems are described for determining tier based bonding groups for upstream or downstream communication between a communication device and a headend. Based on a capability of modem to implement a maximum number of channels and a user subscription level, a combination of channels may assigned to a channel bonding group. After the combination of channels are assigned to the channel bonding group, communication device resources may be allocated between the channels of the combination of channels of the channel bonding group.