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Method and system for operating a vehicular data network based on a layer-2 periodic frame broadcast, in particular a routing protocol

  • US 9,930,608 B2
  • Filed: 02/29/2016
  • Issued: 03/27/2018
  • Est. Priority Date: 02/27/2015
  • Status: Active Grant
First Claim
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1. A method for operating a network node of a wireless digital data network based on broadcast layer-2 periodic frames, for routing data packets in said wireless digital data network, wherein said network comprises a plurality of network nodes, wherein each network node is either a mobile node equipped with an on-board unit (OBU) node, or is a static node equipped with a road-side unit (RSU) node, said method comprising a current network node of the plurality of network nodes carrying out the following steps:

  • periodically broadcasting a layer-2 Network Status Information (NSI) frame which comprises a node identifier of the current network node and a type of node of the current network node;

    receiving broadcasted NSI frames from neighbouring network nodes of the plurality of network nodes reachable by the current network node through wireless communication;

    for each received NSI frame;

    storing the received NSI frame in an entry in a NSI table (NSIT) when the received NSI frame was a first received NSI frame from a neighbouring network node,otherwise, when the received NSI frame was not the first received NSI frame from the neighbouring network node, updating a previously stored NSIT entry with the received NSI frame; and

    marking as expired or deleting any previously entered NSIT entry after a predetermined period of time has passed after receiving or updating said any previously entered NSIT entry,wherein said received NSI frame further comprises routing data which comprises a node identifier and an IP address of an uplink network node for a node broadcasting said received NSI frame, and comprises a list of the identifiers and IP addresses of the network nodes that are connected to an uplink network through the neighbouring node broadcasting said received NSI frame, herewith mentioned as linked node list,wherein the step of periodic broadcasting of said received NSI frame is initiated by the current network node when one or more of the following occurs at the current network node;

    new geographic location data is available for the current network node,new motion data is available for the current network node,a Provider Service Request start (PSR start),a PSR start with an Active Connection Provider Service (ACPS),a User Service Request start (USR start), ora USR start with Active Connection User Service (ACUS), andwherein the Provider Service Context (PSC) of the ACPS or the ACUS comprises the node identifier and the type of node of the current network node;

    the node identifier of the uplink network node of the current network node; and

    a node identifier of an upstream end-point node.

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