Abstract: This application provides a training sequence transmission method and apparatus. The method includes: A first AP broadcasts a trigger frame, where the trigger frame indicates a time sequence of separately sending channel sounding frames by N STAs, and N is an integer greater than 1. The first AP receives the channel sounding frames sequentially sent by the N STAs, where one channel sounding frame includes one or more training sequences. In this solution, only one trigger frame needs to be sent, so that the N STAs can be triggered to separately report channel sounding frames to M+1 APs. However, in the conventional technology, each AP needs to send one channel training request to each STA, that is, N×(M+1) channel training requests are sent in total, to trigger each STA to report a training sequence. Therefore, this solution can significantly reduce signaling overheads.

Abstract: This application provides data transmission methods, devices, and systems. In one implementation, a method comprises: receiving, by a central device of a wireless network, at least one first data packet sent by a remote device of the wireless network, wherein each of the at least one first data packet comprises a sequence number indicating a relative location of a payload of the corresponding first data packet in a second data packet; reordering, by the central device, the at least one first data packet, based on the sequence number of each of the at least one first data packet, to obtain the second data packet; and sending, by the central device, the second data packet.

Abstract: This application discloses a network topology discovery method and a node device. In this application, a root node device sends a link discovery message to a child node device through a first port; receives a link discovery acknowledge message sent by the child node device through a second port of the child node device, where the link discovery acknowledge message includes an identifier of the child node device and an identifier of the second port; and determines a first link based on the link discovery acknowledge message, where the first link is a link between the first port and the second port. According to the solutions of this application, when detecting that a link of a port is connected, the node device discovers an existing topology relationship through message interaction, so as to implement network topology discovery.

Abstract: This application relates to the field of wireless fidelity technologies, and in particular, to a channel access method and a communication apparatus. The method includes: A first access point sends a management frame to a first device, where the management frame includes first indication information, the first indication information indicates at least one first reserved resource that first traffic is allowed to contention-based access, and the at least one first reserved resource only includes a time-frequency resource; and then the first device initiates channel access on the at least one first reserved resource, and transmits the first traffic. Because the at least one first reserved resource is specially reserved for the first traffic, it may be considered that traffic other than the first traffic does not contention-based access the at least one first reserved resource.

Abstract: This application discloses channel sounding methods and communication apparatuses. One method includes: receiving, by a second access point, a user association frame from a first access point, wherein the user association frame carries identification information of a first station and is used to determine a first channel sounding result of the first station associated with the first access point, and determining, by the second access point, the first channel sounding result from a plurality of second channel sounding results based on the user association frame, wherein the plurality of second channel sounding results are obtained by the second access point by performing sounding on a plurality of channel sounding frames from a plurality of stations.

Abstract: This application discloses a channel sounding method and a communication apparatus. The method includes: A first access point receives a channel transfer command frame from a controller or a central access point, and sends a channel transfer frame to a second access point. The channel transfer command frame indicates the first access point to send a channel sounding result of at least one station to the second access point. The channel transfer command frame includes a first sounding dialog token number. The channel transfer frame carries a channel sounding result corresponding to a first sounding dialog token in channel sounding results of a plurality of stations. The first access point forwards the channel sounding result of the at least one station to the second access point.

Abstract: A control device, an execution device, a device management method, and a device management system are provided, and are related to the field of network technologies. The control device includes: a network communications interface configured to connect to an execution device through a network, where the execution device is a network communications device; and a processor configured to send a device management protocol packet through the network communications interface, where the device management protocol packet indicates an operation performed on a register in a first chip in the execution device and/or the device management protocol packet indicates that a pin of a second chip in the execution device is set to a status indicated by the device management protocol packet.

Abstract: In an embodiment an interference cancellation method includes generating, by a first device, a first packet, wherein the first packet comprises a first group of elements, a second group of elements, and user data, the first group of elements being different from the second group of elements and sending, by the first device, the first packet to a second device by using at least one pair of subcarriers, wherein two subcarriers in the at least one pair of subcarriers are symmetrical with respect to a direct current subcarrier, and wherein the first packet is usable by the second device to cancel interference in the user data based on the first group of elements and the second group of elements.

Abstract: Embodiments of this application provide a data transmission method, a communications device, and a storage medium, to reduce pressure caused by a quantity of cross connections between intermediate nodes to the intermediate nodes in a network. In an embodiment of this application, a first communications device obtains Q first code block streams, and obtains a to-be-sent second code block stream based on the Q first code block streams. Q downlink ports are in a one-to-one correspondence with the Q first code block streams, the Q downlink ports correspond to S code block groups, one code block in the Q first code block streams corresponds to one code block group, and the second code block stream obtained by the first communications device includes L code block sets; and for each of the L code block sets, the code block set includes K code blocks corresponding to each of the S code block groups.

Abstract: This application discloses a network topology discovery method and a node device. In this application, a root node device sends a link discovery message to a child node device through a first port; receives a link discovery acknowledge message sent by the child node device through a second port of the child node device, where the link discovery acknowledge message includes an identifier of the child node device and an identifier of the second port; and determines a first link based on the link discovery acknowledge message, where the first link is a link between the first port and the second port. According to the solutions of this application, when detecting that a link of a port is connected, the node device discovers an existing topology relationship through message interaction, so as to implement network topology discovery.

Abstract: This application provides a downstream packet sending method, a downstream packet forwarding method, a downstream packet sending apparatus, and a downstream packet forwarding apparatus. The downstream packet sending method in this application includes: configuring a downstream forwarding path of a downstream packet for a terminal device; generating a source MAC address based on the downstream forwarding path, where the source MAC address is used to indicate the downstream forwarding path; and sending the downstream packet to a forwarding switch, where the downstream packet includes the source MAC address. This application can reduce costs, improve efficiency, and simplify network traffic.

Abstract: This application provides a training sequence transmission method and apparatus. The method includes: A first AP broadcasts a trigger frame, where the trigger frame indicates a time sequence of separately sending channel sounding frames by N STAs, and N is an integer greater than 1. The first AP receives the channel sounding frames sequentially sent by the N STAs, where one channel sounding frame includes one or more training sequences. In this solution, only one trigger frame needs to be sent, so that the N STAs can be triggered to separately report channel sounding frames to M+1 APs. However, in the conventional technology, each AP needs to send one channel training request to each STA, that is, N×(M+1) channel training requests are sent in total, to trigger each STA to report a training sequence. Therefore, this solution can significantly reduce signaling overheads.

Abstract: A control device, an execution device, a device management method, and a device management system are provided, and are related to the field of network technologies. The control device includes: a network communications interface configured to connect to an execution device through a network, where the execution device is a network communications device; and a processor configured to send a device management protocol packet through the network communications interface, where the device management protocol packet indicates an operation performed on a register in a first chip in the execution device and/or the device management protocol packet indicates that a pin of a second chip in the execution device is set to a status indicated by the device management protocol packet.

Abstract: Embodiments of this application provide a data transmission method, a communications device, and a storage medium, to reduce pressure caused by a quantity of cross connections between intermediate nodes to the intermediate nodes in a network. In an embodiment of this application, a first communications device obtains Q first code block streams, and obtains a to-be-sent second code block stream based on the Q first code block streams. Q downlink ports are in a one-to-one correspondence with the Q first code block streams, the Q downlink ports correspond to S code block groups, one code block in the Q first code block streams corresponds to one code block group, and the second code block stream obtained by the first communications device includes L code block sets; and for each of the L code block sets, the code block set includes K code blocks corresponding to each of the S code block groups.

Abstract: This application provides a downstream packet sending method, a downstream packet forwarding method, a downstream packet sending apparatus, and a downstream packet forwarding apparatus. The downstream packet sending method in this application includes: configuring a downstream forwarding path of a downstream packet for a terminal device; generating a source MAC address based on the downstream forwarding path, where the source MAC address is used to indicate the downstream forwarding path; and sending the downstream packet to a forwarding switch, where the downstream packet includes the source MAC address. This application can reduce costs, improve efficiency, and simplify network traffic.

Abstract: This application provides data transmission methods, devices, and systems. In one implementation, a method comprises: receiving, by a central device of a wireless network, at least one first data packet sent by a remote device of the wireless network, wherein each of the at least one first data packet comprises a sequence number indicating a relative location of a payload of the corresponding first data packet in a second data packet; reordering, by the central device, the at least one first data packet, based on the sequence number of each of the at least one first data packet, to obtain the second data packet; and sending, by the central device, the second data packet.

Abstract: Embodiments of the present invention provide an IP packet processing method and apparatus, and a network system. The method includes: allocating, by an operator service gateway, an IP address to a first intranet of an enterprise; and processing, by the operator service gateway according to the IP address, an interactive service packet between the first intranet and a second intranet of the enterprise. In the technical solutions of the present invention, an operator service gateway allocates an IP address to a first intranet of an enterprise, and the operator service gateway processes, according to the IP address, an interactive service packet between the first intranet and a second intranet of the enterprise, thereby reducing deployment complexity of an enterprise internal network, reducing difficulties and costs in management and maintenance of the enterprise internal network, and reducing investment costs for updating hardware devices in the enterprise internal network.

Abstract: An application implementation method and a service controller to facilitate application development and improve application implementation efficiency, where the method includes receiving, by the service controller, description information of a first application, where the description information is received from an application server, determining, by the service controller, target network resource information according to the description information, where the target network resource information indicates a network resource required by the first application, and sending, by the service controller to a network controller, an invoking instruction carrying a network policy, where the invoking instruction instructs the network controller to invoke the target network resource according to the network policy to implement the first application.

Abstract: Embodiments of the present invention disclose a method includes: sending, by a terminal device, video server name information in video request information to a local domain name server; receiving, by the terminal device, address information of a buffer sent by the local domain name server, and sending the video request information to the buffer according to the address information of the buffer; detecting whether a video resource corresponding to video identification information in the video request information exists in the buffer; and if the video resource corresponding to the video identification information exists in the buffer, sending, by the buffer, the video resource to the terminal device. The present invention is applicable to transmission of a network video resource.

Abstract: A method, an apparatus, a system locate an IPTV fault, where the method includes: performing synchronized evaluation on a monitored IPTV video stream according to a synchronization message, obtaining multiple corresponding local upstream evaluation results; receiving an evaluation result report message sent by a downstream monitoring point, where the evaluation result report message includes a downstream evaluation result, an evaluation result identifier, and synchronization packet information; finding, according to the synchronization packet information and the evaluation result identifier in the evaluation result report message sent by the downstream monitoring point, an upstream evaluation result corresponding to the downstream evaluation result; comparing the downstream evaluation result with the upstream evaluation result, and performing fault locating according to a result of the comparison.