Method and apparatus for admission to a MoCA network

What is this patent about?

’333 is related to the field of network admission control and node authentication, specifically within shared-medium environments like MoCA (Multimedia over Coax Alliance) networks. In these environments, multiple independent networks often coexist on the same physical coaxial cabling, such as in apartment buildings or multi-dwelling units. Without physical isolation, a new device attempting to join a network may inadvertently connect to a neighbor’s network or require complex manual configuration by a technician to ensure it attaches to the correct local segment.

The underlying idea behind ’333 is to enable a new node to autonomously discriminate between available networks by retrieving and verifying a human-readable network name before the formal admission process begins. By leveraging a pre-admission handshake, the node can compare the name of an existing network against a locally stored control parameter that defines its authorization scope. This allows the device to filter out unauthorized networks at the protocol level, effectively replacing the need for physical hardware like Point-of-Entry (POE) filters or on-site manual setup by professional installers.

The claims of ’333 focus on a specific signaling sequence where a new node uses timing information from a broadcast beacon to synchronize the transmission of a discovery request. The independent claims describe a mechanism where the node transmits a request specifically to solicit network attributes, receives a response containing network name information, and performs a local comparison against stored parameters. These parameters can be configured to restrict the node to a specific named network, allow it to join any available network, or prevent it from joining any network at all.

In practice, the invention works by utilizing the Admission Control Frame (ACF) slots defined in the network timing. The new node listens for a beacon from a network coordinator, identifies the appropriate window for a discovery request, and sets a specific flag in the discovery options field to request all available network attributes. Once the coordinator responds with the ASCII-encoded network name, the node’s internal management entity evaluates the string. If the name matches the pre-configured authorized value, the node proceeds with the standard admission and encryption handshake; otherwise, it aborts the process and continues searching.

This approach differs from prior solutions by moving the network selection logic into the pre-admission phase using non-encryption-based identifiers. Traditional methods often rely on physical signal blocking via POE devices to prevent cross-talk between units or require users to manually enter complex security keys to find the right network. By using a software-defined network name check, the system allows for 'plug-and-play' installation where a service provider can pre-provision a device with a specific network target, ensuring it connects only to the intended subscriber's infrastructure even when multiple signals are present on the wire.