DOCSIS Upstream Burst Origin Identification via Correlation
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Solution Overview
Problem
Existing systems for troubleshooting upstream communications in cable networks require complex and expensive equipment to identify and process upstream signal bursts, necessitating a simpler and more cost-effective method that does not rely on prior knowledge of upstream signal timing.
Innovation Solution
The method involves capturing upstream bursts using upstream channel descriptor information to extract customer premise equipment (CPE) MAC addresses, allowing for the determination of the burst's origin without demodulation or prior timing knowledge, utilizing a correlator and demodulator to identify burst types and extract MAC addresses from the captured waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex equipment is used to capture and process upstream signal bursts, then measurement precision and reliability are improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential information needed for identification (MAC address) from the upstream burst signals, rather than performing complete demodulation and processing of all signal parameters. This selective extraction approach maintains identification accuracy while significantly reducing equipment complexity by focusing only on the critical data elements needed to determine burst origins.
Solution Approach 2:
The patent uses correlation techniques to create a simplified representation of the upstream burst signals by comparing received signals against known signal templates. This copying approach allows accurate identification of burst characteristics and origins without requiring full-spectrum analysis capabilities, thereby reducing equipment complexity while maintaining measurement precision.
2Measurement precision
If complete demodulation is performed to extract MAC addresses, then measurement precision is improved, but processing time and complexity increase
Solution Approach 1:
The patent extracts only the MAC address portion from the upstream burst signals using correlation techniques, rather than performing complete demodulation of all signal parameters. This selective extraction maintains accurate MAC address identification while significantly reducing processing time by focusing computational resources only on the essential identification data.
Solution Approach 2:
The patent performs preliminary correlation matching of received signals against known signal templates before full demodulation. This preliminary action identifies and isolates the relevant signal portions containing MAC addresses, enabling faster and more efficient extraction without requiring complete signal processing, thus reducing overall processing time while maintaining precision.
3Measurement precision
If prior knowledge of upstream timing is required, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements automatic timing synchronization that allows the system to self-adjust and capture upstream bursts without requiring operator knowledge of timing parameters. The correlation-based approach automatically identifies signal timing characteristics, enabling the equipment to service itself in terms of timing configuration, thereby maintaining measurement precision while dramatically improving ease of operation.
Solution Approach 2:
The patent transforms the timing capture problem from a parameter-dependent operation to a correlation-based operation. By changing the approach from fixed timing parameters to dynamic correlation matching, the system maintains accurate burst capture while eliminating the need for operators to know or configure timing parameters, thus improving ease of operation without sacrificing precision.
Data Source
AI summary
A method and an apparatus for identifying an origin of captured DOCSIS upstream bursts are disclosed. Upstream bursts are captured without knowing their allocated time slots in advance. Information from an upstream channel descriptor is used to generate RF waveforms of upstream burst preambles, which are then correlated to the captured upstream waveforms to determine the type of captured upstream bursts without having to decode the latter. Once the type of the captured upstream bursts is determined, information from the upstream channel descriptor is further used to demodulate and decode the upstream burst, so that CPE MAC addresses can be extracted. From the extracted CPE MAC addresses, the origin of the captured upstream bursts can be identified. The identification of origins of captured upstream bursts assists in locating faults in the cable network.