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:
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:
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. In the solutions provided in this embodiment of this application, code block streams are multiplexed at a code block granularity, so that a quantity of cross connections between intermediate nodes in a network can be reduced, thereby reducing pressure on network management and operation and maintenance.
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:
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:
Embodiments of the present invention discloses a method and an apparatus for evaluating video quality, which relate to the field of communications technologies, and are invented for improving accuracy of evaluating quality of an IPTV service. The method includes: acquiring a channel video stream; acquiring a decoding feature parameter of a decoder, where the decoding feature parameter at least includes a decoding buffer capacity; acquiring a frame information loss ratio according to the decoding feature parameter, and acquiring mean opinion score-video MOS-V parameters according to the channel video stream; and acquiring a MOS-V value of the channel video stream according to the frame information loss ratio and the MOS-V parameters. The embodiments of the present invention are mainly applied to a technology for evaluating video quality.
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 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:
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:
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. The present disclosure implements IPTV fault locating, saves costs of manpower and material resources, and improves efficiency in fault locating.