8results about "Transmission/receiving using protocols" patented technology

Embodiments of the present application disclose a power line communication method and apparatus. The method comprises: a first device generates a physical layer protocol data unit (PPDU) frame, wherein the PPDU frame comprises a frame control field, a training symbol field, and a load symbol field, the load symbol field is used for modulating a transmission load symbol, the training symbol field is used for bearing a training symbol, the training symbol field is used for channel estimation of multiple-input multiple-output (MIMO) and of an extended bandwidth, the frame control field comprises a variable region field, the variable region field comprises a frame identification field and a frequency band field, the frame identification field is used for indicating a frame type of a start of frame (SOF) comprised in the PPDU frame, and the frequency band field is used for indicating an available frequency band of the training symbol and of the load symbol; and the first device sends the PPDU frame to a second device. By using the embodiments of the present application, the power line communication supports the characteristics of MIMO, large bandwidth and the like by means of a redefined PPDU frame, thereby improving the overall network performance.

Embodiments of this application provide a data transmission method applied to power line communication, and a power line communication apparatus and system. The data transmission method includes: A power line node generates a data frame, where the data frame includes a first field, a second field, and a third field, the first field is used to carry a modulation parameter, the second field is used to carry, in a bit mapping manner, identification information that is of at least one destination node of current multicast and that is configured by the power line node, and the third field is used to carry service data; and the power line node sends the data frame to a node in a power line communication network. According to the data transmission method, data can be efficiently transmitted to a plurality of destination nodes, to save bandwidth.

Transmitter for transmitting data signals to at least one communication device via a wired network over a plurality of carriers, wherein the carriers are in frequencies allocated to one or more radio services, each of the radio services being allocated to one or more frequency bands, the transmitter comprising: a symbol generator for creating symbols based on the data signals; a processor for generating copies of the symbols and for determining an allocation of the copies to the plurality of carriers, wherein a first copy and a second copy of each symbol are allocated to carriers which lie in frequency bands which are allocated to different radio services; and a modulator for modulating the copies of the symbols onto the carriers according to the specified allocation.

This application provides a power line communication (power line communication, PLC) method and apparatus. The method and apparatus are applicable to a first node in a PLC system including at least three nodes. The at least three nodes are in a full-duplex working mode. The method includes: The first node receives first information from a second node, where the second node is any node in the at least three nodes other than the first node. The first node determines, based on a priority of the second node and / or a priority of the first information, whether to interrupt transmission of second information, where the second information is information currently transmitted by the first node. In the solutions of this application, an information conflict between different nodes can be avoided, fast communication between a plurality of nodes can be implemented, and communication efficiency of the PLC system can be improved.

Systems and methods for setting a carrier-sensing mechanism in a PLC node are disclosed. In a PLC standard, coexistence is achieved by having the nodes detect a common preamble and backing off by a Coexistence InterFrame Space (cEIFS) time period to help the node to avoid interfering with the other technologies. In one embodiment, a PHY primitive is sent from the PHY to the MAC know that there has been a preamble detection. A two-level indication may be used—one indication after receiving the preamble and other indication after decoding the entire frame. The MAC sets the carrier-sensing mechanism based on the preamble detection.

Systems and methods for setting a carrier-sensing mechanism in a PLC node are disclosed. In a PLC standard, coexistence is achieved by having the nodes detect a common preamble and backing off by a Coexistence InterFrame Space (cEIFS) time period to help the node to avoid interfering with the other technologies. In one embodiment, a PHY primitive is sent from the PHY to the MAC know that there has been a preamble detection. A two-level indication may be used—one indication after receiving the preamble and other indication after decoding the entire frame. The MAC sets the carrier-sensing mechanism based on the preamble detection.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, to mitigate a denial of service attack to a power line communication (PLC) network. A first node of the PLC network may activate a countermeasure that enables the PLC network (including the first node and a second node) to continue to communicate when one or more transmissions associated with a denial of service attack are injected onto the communication medium. This disclosure includes several techniques to detect a denial of service attack and several countermeasures that may be implemented. For example, a countermeasure may include the use of a custom preamble or a custom priority resolution symbol that is specific to the PLC network. The first node and the second node may disregard transmissions that do not conform to the custom preamble or custom priority resolution symbol.

The present disclosure provides systems, methods, and apparatus for mitigating denial of service attacks on a power line communication (PLC) network, including a computer program encoded on a computer storage medium. When one or more transmissions associated with a denial of service attack are injected onto a communication medium, a first node of the PLC network can activate a countermeasure that enables the PLC network (including a first node and a second node) to continue communicating. The present disclosure includes several techniques for detecting denial of service attacks and several countermeasures that can be implemented. For example, one countermeasure may include using a custom preamble or a custom priority resolution symbol specific to the PLC network. The first node and the second node may ignore transmissions that do not conform to the custom preamble or the custom priority resolution symbol.