Abstract:
In one embodiment, a device in a network determines that a particular packet flow in the network is sensitive to packet reordering. The device determines whether a particular packet of the packet flow is to be routed differently than an immediately prior packet in the packet flow, in response to determining that the particular packet flow is sensitive to reordering. The device marks the particular packet as taking a different route than the immediately prior packet in the packet flow, prior to forwarding the marked packet and in response to determining that the particular packet is to be routed differently than the immediately prior packet in the packet flow.
Abstract:
In one embodiment, one or more neighboring nodes that neighbor a sending node in a channel-hopping network are determined. Each neighboring node has multiple channels on which a data packet can be received at a particular time according to a channel-hopping receive schedule. Then, a currently active channel of each neighboring node is determined, where a data packet can be received on the currently active channel at the current time. A channel quality of the currently active channel of each neighboring node is computed, and based on the computations, a transmission overhead is estimated for communicating with each neighboring node. A data packet can then be transmitted to the neighboring node that provides a path that minimizes the estimated transmission overhead.
Abstract:
In one embodiment, a device in a network receives a message from a neighboring device that identifies the electrical phase on which the message was sent. Crosstalk is identified between the device and the neighboring device by determining that the message was received on a different electrical phase than the phase on which the message was sent. One or more distinct communication channels between the device and the neighboring device are identified based on the identified crosstalk with each communication channel including or more electrical phases.
Abstract:
In one embodiment, a device in a network obtains information regarding a transmission between the device and a neighbor of the device in the network. The device determines whether to use the information regarding the transmission to update an expected transmission count associated with the neighbor based on a rate of samples used to compute expected transmission counts. The device updates the expected transmission count, in response to determining that the information regarding the transmission should be used to update the expected transmission count. The device selects a routing path in the network based in part on the updated expected transmission count associated with the neighbor.
Abstract:
In a multiple interface, low power and lossy network comprising a plurality of nodes, a low transmission power and medium transmission power topology are defined for the network and a channel-hopping schedule is defined for the devices operating in each topology. A sender determines that data is capable of being transmitted via a link on the low transmission power topology. The sender determines the transmission parameters for the transmission of the data over the link on the low transmission power topology and determines a low transmission power channel for transmission of the data. The sender transmits the determined channel and the transmission parameters to the receiver. The sender transmits the data via the determined channel in the low transmission power topology.
Abstract:
In a multi-PHY, low power and lossy network comprising a plurality of nodes, a sender determines that a dwell time threshold limit for transmission of data will be exceeded by transmission of the data over a first network interface or that the recipient is unknown. The sender determines transmission parameters for the transmission of the data over the first network interface and transmits the transmission parameters to a receiver device over a second network interface that is different than the first network interface. The sender determines a channel on the first network interface for transmission of the data and transmits the determined channel with the transmission parameters to the receiver, or the receiver determines the channel on the first network interface for transmission of the data and transmits an indication of the determined channel to the sender in response to receiving the transmission parameters.
Abstract:
In one embodiment, a plurality of time-based events is determined in a computer network. Messages are transmitted in the computer network in accordance with the plurality of time-based events. A transmission data rate of the transmitted messages is determined. Then, the transmission data rate is adjusted according to the plurality of time-based events.
Abstract:
In one embodiment, a device receives a destination unreachable message originated by a particular node along a first source route, the message carrying an encapsulated packet as received by the particular node. In response, the device may determine a failed link along the first source route based on a tunnel header and the particular node. Once determining an alternate source route without the failed link, the device may re-encapsulate and re-transmit the original packet on an alternate source route with a new tunnel header indicating the alternate source route (e.g., and a new hop limit count for the tunnel header and an adjusted hop limit count in the original packet).
Abstract:
In one embodiment, a device maintains a predetermined number of high-priority subcarriers for use in communicating high-priority data frames and a predetermined number of low-priority subcarriers for use in communicating low-priority data frames. A data frame is received and a data frame priority is determined for the data frame. If the data frame is determined to be a low-priority data frame, a minimum number of subcarriers, from the low-priority subcarriers, required for communication of the data frame is determined and the data frame is communicated using the minimum number of subcarriers. If the data frame is determined to be a high-priority data frame, a maximum number of subcarriers available, including the high-priority subcarriers and the low-priority subcarriers, is determined and the data frame is communicated using the maximum number of subcarriers.
Abstract:
In one embodiment, a device in a network determines a first channel hopping schedule for the device to receive unicast communications from one or more neighbors of the device. The first channel hopping schedule differs from channel hopping schedules used by the one or more neighbors to receive unicast communications. The device determines a second channel hopping schedule for the device that includes a common channel that is common to the device and the one or more neighbors at any given point in time, wherein the second channel hopping schedule is self-generated by each of the device and the one or more neighbors. The device switches from the first channel hopping schedule to the second channel hopping schedule, in response to a network event. The device causes a particular neighbor to join the network using the second channel hopping schedule.