This infrastructure includes a network MPLS; first and second groups of access points associated with each section of the track; first and second modems, on the train, communicating with access points of the first and second groups. The network includes pairs of local switches, each associated with a section of the track and including first and second local switches for communication with, respectively, the first and second groups of access points of the associated section, and first and second central switches, the switches being in series with one another and implementing a service for defining paths between each central switch and each local switch so the path between the first central switch and the first local switch of a pair and the path between the second central switch and the second local switch of this pair correspond to separate portions of the ring formed by the network.

A system for establishing and maintaining a communications network includes: one or more programs including instructions for: receiving a first set of data associated with a first set of communication links, the first set of communication links configured to establish connection between devices; receiving a second set of data associated with a second set of communication links; receiving a determination of whether one or more communication links of the first set satisfy a pre-determined quality level; receiving a determination of whether one or more communication links of the second set satisfy the pre-determined quality level; receiving a selection from the one or more communication links of the second set that have been determined to satisfy the pre-determined quality level; and connecting the devices via the selected one or more communication links if one or more communication links of the first set is determined to not satisfy the pre-determined quality level.

Disclosed are a system, a computer-readable storage medium storing at least one program, and a computer-implemented method of data transmission. A communication module interfaces communicatively with vehicles. A file management module selects first data from a data queue. The first data is addressed to a destination location. The file management module transmits the first data to the first vehicle. The file management module receives an acknowledgement message from a second vehicle interfaced with the communication interface module. The acknowledgement message is indicative of the first vehicle providing the first data to a server at the destination location. The file management module deletes the first data from the data queue.

Disclosed are a system, a computer-readable storage medium storing at least one program, and a computer-implemented method of data transmission. A communication module interfaces communicatively with vehicles. A file management module selects first data from a data queue. The first data is addressed to a destination location. The file management module transmits the first data to the first vehicle. The file management module receives an acknowledgement message from a second vehicle interfaced with the communication interface module. The acknowledgement message is indicative of the first vehicle providing the first data to a server at the destination location. The file management module deletes the first data from the data queue.

According to an aspect, an existing end-to-end bearer data path of communication between a wireless device and an endpoint in a core network is modified. The wireless device receives parametric information identifying respective service capabilities of network nodes in the core network that are available for forming alternate end-to-end bearer data paths of communication between the wireless device and the endpoint. The parametric information is used to determine that a more favorable end-to-end bearer data path of communication between the wireless device and the endpoint is available. The more favorable end-to-end bearer data path has a more favorable service capability in the core network as compared to the existing end-to-end bearer data path. The wireless device requests a path modification from the existing end-to-end bearer data path to the more favorable end-to-end bearer data path.

According to an aspect, an existing end-to-end bearer data path of communication between a wireless device and an endpoint in a core network is modified. The wireless device receives parametric information identifying respective service capabilities of network nodes in the core network that are available for forming alternate end-to-end bearer data paths of communication between the wireless device and the endpoint. The parametric information is used to determine that a more favorable end-to-end bearer data path of communication between the wireless device and the endpoint is available. The more favorable end-to-end bearer data path has a more favorable service capability in the core network as compared to the existing end-to-end bearer data path. The wireless device requests a path modification from the existing end-to-end bearer data path to the more favorable end-to-end bearer data path.

A vehicle information communication system includes: a plurality of vehicles; and a server configured to communicate with the plurality of vehicles. The server is configured to perform communication by using either a first communication mode or a second communication mode. In the first communication mode, the server receives and transmits information to and from each of the plurality of vehicles individually. In the second communication mode, the server receives and transmits the information to and from a part of the plurality of vehicles and the information is shared among the plurality of vehicles by using vehicle-to-vehicle communication.

A vehicle information communication system includes: a plurality of vehicles; and a server configured to communicate with the plurality of vehicles. The server is configured to perform communication by using either a first communication mode or a second communication mode. In the first communication mode, the server receives and transmits information to and from each of the plurality of vehicles individually. In the second communication mode, the server receives and transmits the information to and from a part of the plurality of vehicles and the information is shared among the plurality of vehicles by using vehicle-to-vehicle communication.

In a communication system capable of executing terminal-to-terminal communication in which wireless communication is performed directly without an intervention of a base station device between a first terminal device that is in a state in which cellular communication with the base station device can be executed and a second terminal device that is not in the state in which cellular communication with the base station device can be executed, the base station device generates control information necessary for the first terminal device to search for the second terminal device, and transmits the generated control information to the first terminal device.

Various embodiments implement a set of low overhead mechanisms to enable on-demand routing protocols. The on-demand protocols use route accumulation during discovery floods to discover when better paths have become available even if the paths that the protocols are currently using are not broken. In other words, the mechanisms (or “Route Optimizations”) enable improvements to routes even while functioning routes are available. The Route Optimization mechanisms enable nodes in the network that passively learn routing information to notify nodes that need to know of changes in the routing information when the changes are important. Learning routing information on up-to-date paths and determining nodes that would benefit from the information is performed, in some embodiments, without any explicit control packet exchange. One of the Route Optimization mechanisms includes communicating information describing an improved route from a node where the improved route diverges from a less nearly optimal route.