PHY Link Signaling in Cable Networks
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Solution Overview
Problem
In future cable networks, establishing a physical layer (PHY) link between a network termination modem and a cable modem becomes complex due to variable channel characteristics, requiring assistance from the network termination modem for frequency location and transmission settings, which existing methods do not effectively address.
Innovation Solution
Embedding a PHY link signaling channel within the multi-carrier channel allows for PHY link establishment between the network termination modem and the cable modem without involving higher layers, using a PHY transmitter that generates and transmits multi-carrier modulated signals carrying both data and PHY link signaling, enabling the cable modem to determine channel characteristics and synchronize with the network termination modem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PHY link establishment requires determination of frequency location and transmission characteristics, then the cable modem can establish reliable physical layer connection, but the complexity of the establishment process increases and higher layer involvement is required
Solution Approach 1:
The patent applies preliminary action by pre-configuring the network termination modem with a template of the multi-carrier channel including frequency location, transmission characteristics, and PHY link signaling parameters. This allows the cable modem to automatically establish the PHY link without requiring complex determination procedures or higher layer involvement, as all necessary parameters are provided in advance through the embedded signaling channel.
2Extent of automation
If embedded PHY link signaling channel is used, then automated PHY link establishment is enabled without higher layer involvement, but the multi-carrier channel structure becomes more complex
Solution Approach 1:
The patent merges the PHY link signaling channel with the multi-carrier data channel by embedding the signaling information within the same physical medium and time-frequency resources. This combination allows automated PHY link establishment while avoiding the need for separate dedicated signaling channels, thereby limiting the increase in overall system complexity despite the added automation capability.
3Adaptability or versatility
If variable channel characteristics are supported, then the system can adapt to different cable network conditions, but the PHY link establishment process requires more assistance and control from network termination modem
Solution Approach 1:
The patent applies dynamics by making the PHY link signaling template configurable and adaptable to different channel conditions. The network termination modem can dynamically adjust the template parameters based on detected channel characteristics, and this adapted template is then provided to the cable modem for PHY link establishment. This allows the system to handle variable channel conditions while keeping the establishment process automated and reducing the need for complex real-time control during the actual link setup.
Data Source
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AI summary
Embodiments include systems and methods for enabling a physical layer (PHY) link signaling channel between a network termination modem and a cable modem in a cable network. The PHY link signaling channel is embedded within the same multi-carrier channel as the data and enables PHY link up between the network termination modem and cable modem without involvement of higher layers (e.g., MAC). The PHY link signaling channel can be implemented in the downstream (from the network termination modem to the cable modem(s)) or in the upstream from a cable modem to the network termination modem. Embodiments are applicable to any known cable network, and particularly to cable networks implementing the DOCSIS and EPoC standards.