摘要:
A method of powerline communications including a first node and at least a second node on a powerline communications (PLC) channel in a PLC network. The first node sends a physical layer (PHY) data frame on the PLC channel including a preamble, a PHY header, a MAC header and a MAC payload. The MAC header includes a Cyclic Redundancy Check (CRC) field (MH-CRC field). The second node receives the data frame, parses the MAC header to reach the MH-CRC field, and performs CRC verification using the MH-CRC field to verify the MAC header. If the CRC verification is successful, (i) the second node parses another portion of the MAC header to identify a destination address of the data frame and (ii) to determine whether the data frame is intended for the second node from the destination address.
摘要:
A method of powerline communications including a first node and at least a second node on a PLC channel in a PLC network. The first node sends a physical layer (PHY) data frame on the PLC channel including a preamble, PHY header, a MAC header and a MAC payload. The PHY header includes a destination address field having a destination address therein. The second node receives the data frame. The second node compares its network address to the destination address before decoding the MAC header and MAC payload, providing power savings by allowing the second node to not decode the MAC header or MAC payload if its network address does not match the destination address in the PHY header of the data frame.
摘要:
A method of powerline communications between a plurality of nodes on a powerline communications (PLC) channel including a first node and a second node. At least one communication quality measure is determined for the PLC channel. Based on the communication quality measure, a preamble of a data frame is dynamically switched between a reference preamble having a reference symbol length including a reference number of syncP symbols and a reference number of syncM symbols and at least a first extended preamble having an extended symbol length that is greater than (>) the reference symbol length. The data frame is then transmitted on the PLC channel.
摘要:
A method of powerline communications (PLC) includes compiling a data frame for physical layer (PHY) by a first communications device at a first communications node on a powerline of a PLC network. The data frame includes a single tone PHY header portion and a data payload portion in a set of tones including at least one tone having a frequency different from a frequency of the single tone. The PHY header portion includes tone mask identification information identifying the set of tones. The first communications device transmits the data frame over the powerline to a second communications device at a second communications node on the powerline. The second communications device receives the data frame, and decodes the data payload using the tone mask identification information in the PHY header portion.
摘要:
A method of powerline communications in a powerline communications (PLC) network including a first node and at least a second node. The first node transmits a data frame to the second node over a PLC channel. The second node has a data buffer for storing received information. The second node runs a flow control algorithm which determines a current congestion condition or a projected congestion condition of the data buffer based on at least one congestion parameter. The current congestion condition and projected congestion condition include nearly congested and fully congested. When the current or projected congestion condition is either nearly congested or fully congested, the second node transmits a BUSY including frame over the PLC channel to at least the first node. The first node defers transmitting of any frames to the second node for a congestion clearing wait time.
摘要:
Systems and methods for Carrier Sense Multiple Access (CSMA) and collision detection using a noise model are described. In various implementations, these systems and methods may be applicable to Power Line Communications (PLC). For example, a method may include receiving a signal via a communications channel in a PLC network, determining a feature of the signal, comparing the feature of the signal with a corresponding feature of a cyclostationary noise model, and taking a predetermined action based, at least in part, upon the comparison. In some implementations, taking the predetermined action may include determining whether to backoff or to transmit a packet over the communications channel. In other implementations, taking the predetermined action may include determining whether an error is due to a packet collision or due to a low quality of the communications channel.
摘要:
Systems and methods for designing, using, and/or implementing hybrid communication networks are described. In various embodiments, these systems and methods may be applicable to power line communications (PLC). For example, one or more of the techniques disclosed herein may include methods to coordinate medium-to-low voltage (MV-LV) and low-to-low voltage (LV-LV) PLC networks when the MV-LV network operates in a frequency subband mode and the LV-LV network operates in wideband mode (i.e., hybrid communications). In some cases, MV routers and LV routers may have different profiles. For instance, MV-LV communications may be performed using MAC superframe structures, and first-level LV to lower-level LV communications may take place using a beacon mode. Lower layer LV nodes may communicate using non-beacon modes. Also, initial scanning procedures may encourage first-to-second-level LV device communications rather than MV-to-first-level LV connections.
摘要:
Systems and methods for designing, using, and/or implementing hybrid communication networks are described. In various embodiments, these systems and methods may be applicable to power line communications (PLC). For example, one or more of the techniques disclosed herein may include methods to coordinate medium-to-low voltage (MV-LV) and low-to-low voltage (LV-LV) PLC networks when the MV-LV network operates in a frequency subband mode and the LV-LV network operates in wideband mode (i.e., hybrid communications). In some cases, MV routers and LV routers may have different profiles. For instance, MV-LV communications may be performed using MAC superframe structures, and first-level LV to lower-level LV communications may take place using a beacon mode. Lower layer LV nodes may communicate using non-beacon modes. Also, initial scanning procedures may encourage first-to-second -level LV device communications rather than MV-to-first-level LV connections.
摘要:
Phase detection between service nodes in a as “PRIME” (“PoweRline Intelligent Metering Evolution”) communications network, in which the service nodes are connected to one phase of a three-phase power distribution network. A service node joining a sub-network receives packet data units from other service nodes in the sub-network, including those that can potentially serve as a switch node to which the joining service node can register. The joining service node measures an elapsed time between a zero crossing of the AC power waveform at its phase and the start of a frame in the received packet data units. This elapsed time is compared with a similar zero crossing gap communicated by other service nodes in the packet data units, to identify the relative phases to which the two service nodes are connected.
摘要:
Phase detection between service nodes in a as “PRIME” (“PoweRline Intelligent Metering Evolution”) communications network, in which the service nodes are connected to one phase of a three-phase power distribution network. A service node joining a sub-network receives packet data units from other service nodes in the sub-network, including those that can potentially serve as a switch node to which the joining service node can register. The joining service node measures an elapsed time between a zero crossing of the AC power waveform at its phase and the start of a frame in the received packet data units. This elapsed time is compared with a similar zero crossing gap communicated by other service nodes in the packet data units, to identify the relative phases to which the two service nodes are connected.