DOCSIS Device Co-location Verification via Ranging Offset
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Solution Overview
Problem
Cable service providers face economic losses due to the unauthorized sharing of bundled services, as DOCSIS-enabled devices are not effectively verified to be co-located with the subscriber's account, allowing non-subscribers to access services without payment.
Innovation Solution
A co-location processor comprising a co-location agent and a co-location alert manager that periodically polls subscriber billing systems to verify the co-location of DOCSIS-enabled devices by comparing their MAC domain and normalized ranging offset values, sending alerts if devices are not co-located or if unauthorized sharing is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cable service providers rely on MAC address authorization alone to provide services, then device authentication is simplified, but unauthorized service sharing by non-subscribers becomes possible
Solution Approach 1:
The patent introduces a co-location verification system as an intermediary layer between MAC address authorization and service delivery. This system uses ranging offset values and MAC domain information as intermediary parameters to verify that authorized devices are physically co-located with the subscriber, preventing unauthorized devices from accessing services even though they have valid MAC addresses
Solution Approach 2:
The patent replaces the simple mechanical MAC address verification system with a more complex system that uses timing-based ranging offset measurements and MAC domain analysis. This substitution allows the system to detect physical co-location status, adding a layer of security that prevents service sharing while maintaining ease of device authentication
2Adaptability or versatility
If multiple DOCSIS-enabled devices are registered with the same subscriber account, then service accessibility is improved, but detection of unauthorized sharing becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the physical location status of registered devices by comparing their ranging offset values and MAC domain assignments. This feedback system automatically detects when devices are not co-located and can trigger alerts or block services, making unauthorized sharing detectable while allowing legitimate multi-device access
Solution Approach 2:
The patent changes the verification parameter from simple MAC address matching to a composite parameter set including ranging offset values and MAC domain information. This parameter transformation enables the system to distinguish between authorized multi-device usage and unauthorized sharing by analyzing the physical co-location status of devices
3Reliability
If cable providers implement co-location verification systems, then service security is improved, but system complexity increases
Solution Approach 1:
The patent makes the co-location verification system multi-functional by using the same ranging offset collection infrastructure for multiple purposes: service authorization, co-location verification, and billing control. This universality reduces overall system complexity while maintaining high security standards
Data Source
AI summary
A system and method for determining if DOCSIS-enabled devices (DEDs) connected to an HFC cable network are co-located. Subscriber account data is acquired to determine the DEDs associated with a subscriber account. The MAC address of the DEC is used to obtain the MAC domain to which a DED is assigned and the ranging offset value associated with the DED. An alert is issued if multiple DEDs associated with a subscriber account are associated with different MAC domains. The alert signifies that DEDs associated with the account are not co-located. Where DEDs associated with an account are associated with the same MAC domain, the normalized ranging offset values associated with the subscriber's DEDs are compared to determine if the difference in their values exceeds a predetermined threshold. If the difference in their values exceeds a predetermined threshold, an alert is issued. The alert again signifies that DEDs associated with the account are not co-located.