Methods, apparatuses, and systems for improving utilization of a communications system (e.g., a satellite communications system) are provided, using delayed reliability techniques as part of a multicast transport protocol. Embodiments may operate in a client-server context, in which the server-side of the communication link multicasts data to requesting users and to users where the data is being speculatively prepositioned. Requesting users may implement reliability checks to verify receipt of complete data in response to the request while user systems where data is being speculatively prepositioned may receive multicast reliability information in response to reliability requests from other users, but may not request replacement of missing or corrupted data themselves until a request is made for the data by that system.

This application discloses a data transmission method performed by a computer device. It is detected that the i.sup.th forward reference frame is lost, during video decoding, when the (i+T+1).sup.th forward reference frame is decoded, since a video frame in a first reference frame combination of the (i+T+1).sup.th forward reference frame is located before the (i+T+1).sup.th forward reference frame with an interval of T forward reference frames from the (i+T+1).sup.th forward reference frame, T being a positive integer, so that before the (i+T+1).sup.th forward reference frame is decoded, there is more time for retransmitting the i.sup.th forward reference frame, improving a possibility of completing retransmission of the i.sup.th forward reference frame during decoding of the (i+T+1).sup.th forward reference frame, thereby reducing a possible waiting time for decoding the (i+T+1).sup.th forward reference frame.

A mobile device is configurable by a controller to remotely operate a target controllable device, the controller and the target controllable device being part of a hospitality media system. A communication module establishes a connection to the controller and performs data transfer between the mobile device and the controller. A customization module receives customization information from the controller and customizes a user interface of the mobile device accordingly. A status information regarding the target controllable device is received from the controller and displayed on the user interface of the mobile device. A user of the mobile device thereafter issues a command via the user interface to the controller, the command containing instruction intended for the target controllable device. The controller receives the command and operates the target controllable devices in dependence upon instruction contained in the command received from the mobile device.

Systems and methods for error detection in video data is described. An encoding computing system can receive a video frame. The encoding computing system can encode and decode the video frame based on an encoding scheme. The encoding computing system can generate a frame error detection code for the decoded video frame based on an error detection code generation scheme. The encoding computing system can send the encoded video frame and the error detection code to a decoding computing system. The decoding computing system can decode the encoded video frame and generate a second error detection code using the code generation scheme. The decoding computing system can detect that the decoded video frame is corrupted by comparing the error detection code and the second error detection code.

The present invention relates to a data transmission control method, an information sending end and receiving end, and an aerial vehicle image transmission system. The data transmission control method includes: receiving data frames sent by a sending end, the data frames being sequentially sent by the sending end in an order of a data frame sequence; and returning an acknowledgement signal corresponding to a currently-received data frame N to the sending end, to enable the information sending end to determine a current network status according to the acknowledgement signal, and adjusting data encoding quality of the sent data frame based on the current network status. In the method, delays for image quality and transmission speed to recover when a network status recovers can be effectively reduced by rapidly determining a current network status based on the feedback of an acknowledgement signal.

Methods, apparatuses, and systems for improving utilization of a communications system (e.g., a satellite communications system) are provided, using delayed reliability techniques as part of a multicast transport protocol. Embodiments may operate in a client-server context, in which the server-side of the communication link multicasts data to requesting users and to users where the data is being speculatively prepositioned. Requesting users may implement reliability checks to verify receipt of complete data in response to the request while user systems where data is being speculatively prepositioned may receive multicast reliability information in response to reliability requests from other users, but may not request replacement of missing or corrupted data themselves until a request is made for the data by that system.

Methods, apparatuses, and systems for improving utilization of a communications system (e.g., a satellite communications system) are provided, using delayed reliability techniques as part of a multicast transport protocol. Embodiments may operate in a client-server context, in which the server-side of the communication link multicasts data to requesting users and to users where the data is being speculatively prepositioned. Requesting users may implement reliability checks to verify receipt of complete data in response to the request while user systems where data is being speculatively prepositioned may receive multicast reliability information in response to reliability requests from other users, but may not request replacement of missing or corrupted data themselves until a request is made for the data by that system.

An information sending and receiving method and an apparatus are disclosed. In an embodiment an information sending apparatus includes a processor configured to determine, based on a physical broadcast channel (PBCH) period or a synchronization signal block burst set (SS block burst set) period, a period in which remaining minimum system information (RMSI) is to be sent and a sender configured to send the RMSI to a terminal device by using X as the period, wherein X is a multiple of the PBCH period, or X and the PBCH period are in a one-to-one correspondence or a one-to-many relationship, and wherein a network device is configured to send at least one piece of RMSI by using at least one beam or antenna port.

A method for retransmitting a packet on a wireless fidelity link includes receiving a packet retransmission request sent by a user terminal and determining a packet that needs to be retransmitted, detecting a downlink quality indicator on a gateway side of a first wireless fidelity link and a downlink quality indicator on a gateway side of a second wireless fidelity link, determining a link for retransmitting the packet, based on the downlink quality indicator on the gateway side of the first wireless fidelity link and the downlink quality indicator on the gateway side of the second wireless fidelity link, and sending, to the user terminal on the determined link for retransmitting the packet, the determined packet that needs to be retransmitted.

A method for retransmitting a packet on a wireless fidelity link includes receiving a packet retransmission request sent by a user terminal and determining a packet that needs to be retransmitted, detecting a downlink quality indicator on a gateway side of a first wireless fidelity link and a downlink quality indicator on a gateway side of a second wireless fidelity link, determining a link for retransmitting the packet, based on the downlink quality indicator on the gateway side of the first wireless fidelity link and the downlink quality indicator on the gateway side of the second wireless fidelity link, and sending, to the user terminal on the determined link for retransmitting the packet, the determined packet that needs to be retransmitted.