摘要:
In a wireless frequency hopping communication system, a protocol, which does not employ carrier sense or collision detect, is provided for allocating bandwidth fairly and efficiently under varying load conditions, wherein a node is permitted random access to the medium bandwidth under light loading conditions and wherein under higher loading conditions a time/bandwidth allocation is made with a portion of the allocation dedicated to inband backhaul tasks by introducing a form of polling, the size of the reserved time/bandwidth allocation being selected based on traffic pattern. Under such heavy load conditions, non-slave traffic is allocated bandwidth in slots as pseudo-slave packets to guarantee a share of the bandwidth. Depending on the activity of the population of packets, including responsiveness and trend of responsiveness, the relative size of the slots is determined. Random access is always permitted for certain classes of packets, namely handshake packets, which are used to establish the master/slave relationships between nodes, no matter how a node is loaded. Once a master/slave relationship is established, a slave is only allowed to use the random access method to inform its master that it has data pending for transmission to the network when the node has a light load. Polling is always employed when the node at least has one active slave. According to one aspect of the invention, the size of the reserved allocation is based on a variable heartbeat of a multicast poll. Further in accordance with the invention, a handshaking between master and slave permits transition between operation in a random access mode and a polled mode.
摘要:
Methods and systems for sending a broadcast message in frequency hopping and other systems. Instead of sending a complete message separately to each device, a relatively small packet or “chirp” is sent. These chirps are either targeted at known devices or sent in a manner to sweep the RF band. Devices that hear the chirps get information about the channel and/or time that the broadcast data will be sent. These devices then listen for the broadcast data as instructed, e.g., at the specified time on the specified channel. A system may alternatively, or in addition, use a scheduled hopping sequence break as a broadcast moment. Such a broadcast moment can be scheduled to periodically interrupt the node hopping sequences so that, at such times, many or all nodes are scheduled to be on the same channel for potential broadcasts.
摘要:
A list of nodes is segmented into one or more segments, each segment having a node limit and a segment criteria, attributes associated with a first node are identified, a determination is made whether to add the first node to a particular segment of the node list based on the node limit and the attributes of the first node, nodes are ranked nodes in the particular segment, and a determination is made whether to remove a candidate node from the particular segment based on the node limit.
摘要:
Systems and methods for over-the-air firmware distribution to battery-powered devices are disclosed. Such over-the-air distribution is accomplished, for example, using a non-battery-powered device as a buffer, for example, to reduce or eliminate the delay time of the over-the-air network. The firmware can be sent to and stored on a nearby, non-battery-powered device and then sent from there to the battery-powered endpoint device. The distribution of firmware to battery-powered devices may be implemented in an AMI system, a mesh network, a multi-channel radio network, or any other environment in which firmware distribution is desirable.
摘要:
Methods and systems for providing accurate time-keeping on battery-powered communication devices used in AMI systems, mesh networks, and multi-channel radio networks. One embodiment allows the use of low power (and low cost) crystals in battery-powered endpoints by periodically correcting the poor timing of these crystals using communications with a nearby, non-battery-powered device. Such communications allow the battery-powered devices to align their timing with that of their non-battery neighbors, among other things.
摘要:
A list of nodes is segmented into one or more segments, each segment having a node limit and a segment criteria, attributes associated with a first node are identified, a determination is made whether to add the first node to a particular segment of the node list based on the node limit and the attributes of the first node, nodes are ranked nodes in the particular segment, and a determination is made whether to remove a candidate node from the particular segment based on the node limit.
摘要:
Systems, methods, and devices for consolidating network packetized data are disclosed. Data packets are received by a consolidator. Common content and unique attributes of the packets are identified. A consolidated packet is created and the consolidated packet is transmitted in response to a condition.
摘要:
Methods and systems for providing accurate time-keeping on battery-powered communication devices used in AMI systems, mesh networks, and multi-channel radio networks. One embodiment allows the use of low power (and low cost) crystals in battery-powered endpoints by periodically correcting the poor timing of these crystals using communications with a nearby, non-battery-powered device. Such communications allow the battery-powered devices to align their timing with that of their non-battery neighbors, among other things.
摘要:
Systems and methods for over-the-air firmware distribution to battery-powered devices are disclosed. Such over-the-air distribution is accomplished, for example, using a non-battery-powered device as a buffer, for example, to reduce or eliminate the delay time of the over-the-air network. The firmware can be sent to and stored on a nearby, non-battery-powered device and then sent from there to the battery-powered endpoint device. The distribution of firmware to battery-powered devices may be implemented in an Advanced Metering Infrastructure (AMI) system, a mesh network, a multi-channel radio network, or any other environment in which firmware distribution is desirable.
摘要:
Methods and systems for sending a broadcast message in frequency hopping and other systems. Instead of sending a complete message separately to each device, a relatively small packet or “chirp” is sent. These chirps are either targeted at known devices or sent in a manner to sweep the RF band. Devices that hear the chirps get information about the channel and/or time that the broadcast data will be sent. These devices then listen for the broadcast data as instructed, e.g., at the specified time on the specified channel. A system may alternatively, or in addition, use a scheduled hopping sequence break as a broadcast moment. Such a broadcast moment can be scheduled to periodically interrupt the node hopping sequences so that, at such times, many or all nodes are scheduled to be on the same channel for potential broadcasts.