Embodiments are provided for syncing multiple electronic devices for collective audio playback. According to certain aspects, a master device connects (218) to a slave device via a wireless connection. The master device calculates (224) a network latency via a series of network latency pings with the slave device and sends (225) the network latency to the slave device. Further, the master devices sends (232) a portion of an audio file as well as a timing instruction including a system time to the slave device. The master device initiates (234) playback of the portion of the audio file and the slave devices initiates (236) playback of the portion of the audio file according to the timing instruction and a calculated system clock offset value.

The present invention relates to a method of transmitting and a method of receiving signals an corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.

The present invention relates to a method of transmitting and a method of receiving signals an corresponding apparatus. One aspect of the present invention relates to an efficient L1 signaling method for an efficient transmitter and an efficient receiver using the efficient L1 signaling method for an efficient cable broadcasting.

Router nodes of a wireless network deliver layer-3 multicast packets to subscribing end devices. In an embodiment, upon receiving a layer-3 multicast packet, a router determines a source that originated the layer-3 multicast packet. The router broadcasts at L2-level, the layer-3 multicast packet only if either one of a first condition and a second condition is satisfied. The first condition is satisfied only if (A) the source is not a descendant node of the router node according to the hierarchy, (B) the layer-3 multicast packet is received from a parent node, and (C) the layer-3 multicast address is subscribed to by a descendant of the router node. The second condition is satisfied only if (A) the source is a descendant of the router node, and (B) the layer-3 multicast packet is received from a child node according to the hierarchy, the source being reachable from the child node.

A method implemented by a station (STA) in a Wireless Local Area Network (WLAN) to acknowledge a downlink (DL) multi-user (MU) physical layer (PHY) Protocol Data Unit (PPDU) transmitted by an access point (AP). The method includes receiving the DL MU PPDU, decoding a frame from the DL MU PPDU, where the frame includes an indication requesting the STA to provide a trigger-based immediate acknowledgement, determining whether trigger information for an uplink (UL) MU transmission has been obtained from the DL MU PPDU, responsive to a determination that the trigger information has been obtained from the DL MU PPDU, transmitting a trigger-based immediate acknowledgement frame to the AP during the UL MU transmission, according to the trigger information, and responsive to a determination that the trigger information has not been obtained from the DL MU PPDU, refraining from transmitting the trigger-based immediate acknowledgement frame to the AP.

The present invention pertains to a wireless communication system. More specifically, a signal transmission and reception method is proposed, wherein the method for a relay terminal transmitting and receiving a signal in a device to device (D2D) wireless communication system comprises receiving a disaster information message from a base station, and transmitting the disaster information message to one or more remote terminals if a message including the same disaster information as the disaster information message has not been received already.

Methods, apparatuses and computer program products are described that facilitate sending and receiving notifications related to user equipment being added to or leaving a multicast group or multicast stream in a network. A method can include receiving, from a session controller, a request for reporting when protocol data unit (PDU) sessions are added to/removed from a downlink replication tree associated with an internet protocol multicast flow; determining whether said PDU session has been added to or removed from the downlink replication tree associated with the internet protocol multicast flow; and, in response to said determining, transmitting a message to a session management function indicative of that said PDU session has been added to or removed from said downlink replication tree. The message can include an internet protocol address associated with a source of said added or removed multicast flow and/or the multicast destination of said internet protocol multicast flow.

A broadcast transmission system according to an aspect of the present invention includes a broadcast network controller and a broadcast network switch, thereby transmitting an Internet protocol (IP) stream for a service that cannot be transmitted through one physical layer pipe (PLP) by distributing the IP stream into a combination of one or more PLPs. In this case, the combined PLPs may be in one or more broadcast network frequency bands. The broadcast network controller determines the combination of PLPs, and the broadcast network switch distributes the IP stream into one or more PLPs according to a control command of the broadcast network controller.

A broadcast transmission system according to an aspect of the present invention includes a broadcast network controller and a broadcast network switch, thereby transmitting an Internet protocol (IP) stream for a service that cannot be transmitted through one physical layer pipe (PLP) by distributing the IP stream into a combination of one or more PLPs. In this case, the combined PLPs may be in one or more broadcast network frequency bands. The broadcast network controller determines the combination of PLPs, and the broadcast network switch distributes the IP stream into one or more PLPs according to a control command of the broadcast network controller.

A method of compensating for potential interruptions in a wireless spatially selective connection over which data at a first compression level is transmitted from a host device to a client device involves determining (S32) that an interruption to the wireless spatially selective connection over which data is being transmitted at a first compression level to a client device is starting or is due to start, compressing (S3Y3) the data at a second compression level that is higher than the first compression level, and forwarding (S34) the data compressed at the second compression level to a transmitting component for wireless spatially non-selective broadcast while the interruption to the spatially selective connection occurs. Determining that the interruption is due to start may involve analysing a historical record of previous interruptions to determine a periodicity of the previous interruptions or receiving information from the transmitting component that an interruption is expected to occur. Determining that the interruption is starting may involve determining that a buffer used for storing the data prior to transmittal is full, indicative that an interruption has commenced, or receiving information from the transmitting component that an interruption has commenced.