9 results about "Multicast" patented technology

A multicasting system includes a delivery server for multicasting a content via at least one upper router and a plurality of lower routers, a plurality of client devices for playing the content multicast by the delivery server and an upper router controller, a content retrieving unit, and a content playing unit. The client device includes an individual storage unit, a content retrieving unit, a content playing unit, a switch time addition unit, and a display controller. The delivery server includes a content delivery unit for delivering each content to the client device. The upper router controller includes a session information retrieving unit, a book scheduling unit, and a schedule information notifier.

In a method for repeat transmission of messages in a centrally controlled communication network including a plurality of terminals and a central station messages assigned sequence numbers are broadcast or multicast from the central station for reception by terminals of a participating group. As soon as a terminal detects loss of a transmitted message or an error in the transmitted message, it transmits a repeat request for repeat transmission of that message, which includes the sequence number of the lost or erroneous message, over another communication link, especially a point-to-point communication link. The central station repeats the message transmission of the lost or erroneous message but only until a predetermined maximum number of repetitions occurs within a predetermined time interval or until a positive acknowledgement of receipt of the previously lost or erroneous message is received.

A method and system for fast channel change (FCC) between multicast digital video feeds wherein each digital video feed is converted to a set of slotted multicasts, each having the same content but delayed in time relative to each other, metadata associated with the digital video feed and the slotted multicasts is published using an on-the-wire format to downstream client devices (e.g. set-top boxes), when a user selects the digital video feed (i.e. a new channel) the client device uses the metadata to select a slotted multicast that minimizes the total time to reach the next random access point (RAP) while allowing a maximum leave-join delay. Both a FCC server that generates the slotted multicasts and a FCC middleware on the client devices are connected to a common time reference, and the method and system provide for adjusting to clock drift on the FCC server relative to the common time reference.

The present invention relates to the methods, the network units, the terminals and the communication systems of the broadcast/multicast services which are used for providing to the terminal. The present invention is characterized in that: sending the broadcast accessing key(BAK) to the terminal based on the subscribing of the terminal is provided with the starting time(VF) and the ending time(VT) of the period of validity; sending the broadcast accessing key and the starting time as well as the ending time of the period of validity to the terminal; utilizing the broadcast accessing key to decrypt the received and encrypted broadcast/multicast service data based on the starting time as well as the ending time of the period of validity.

The invention relates to a transmission method and a transmission system and a transmission device of a multicast/broadcast business MBMS. A high speed sharing data sending entity is arranged in a wireless accession network side and a high speed sharing data receiving entity is arranged in an equipment side of user. The invention is characterized in that the method comprises: the high speed sharing data sending entity of the wireless accession network sends a MBMS data packet to the equipment side of the user in a high speed downstream grouping accession transmission way; the high speed sharing data receiving entity in the equipment side of the user receives the MBMS data packet. The invention embodiment realizes providing transmission of the MBMS data packet in downstream sharing channel in the high speed downstream grouping accession transmission way via arranging the high speed sharing data sending entity in the wireless accession network side and arranging the high speed sharing data receiving entity in the equipment side of the user, so as to improve transmission speed of the MBMS.

The present invention discloses a method for realizing interaction multicast in PON (passive optical network), being characterized by receiving the multicast policy management entity and the multicast user information entity, wherein the multicast policy management entity comprises a dynamic access control list ACL; and the multicast user information entity and the ACL entry of the multicast policy management entity have a corresponding relationship; receiving the internet group management protocal IGMP joint message; acquiring the multicast user information carried by the IGMP joint message; looking for the multicast user information entity being matched with the multicast user information acquired from the IGMP joint message; determining uniquely and looking for the ACL entry corresponding to the multicast user information according to the corresponding relationship between the multicast user information entity and the ACL entry; and establishing a two-layer forward entry according to the uniquely determined ACL entry. Besides, the present invention also discloses a system and device for realizing interaction multicast in PON.

The present invention promotes the use of contents distribution by multicast, and enables users to stop viewing without needing special processing in a terminal, and to restart viewing in the same terminal as that at stop time or a different terminal, thus increasing users' usability and use opportunities. In a distribution system including a service server, a multicast distribution server, and a unicast distribution server, the service server, in a first access from a PC, selects the multicast distribution server as a distribution server, and selects the unicast distribution server as a distribution server after stopping.

The invention relates to the technical field of optical communication, and provides a multicast optical switch assembly supporting a line ID function and an implementation method thereof. When the multicast optical switch is used on a lower wave side, the input end of the transceiver module is coupled with each input end of a lower wave in the multicast optical switch through a wave separator; when the multicast optical switch is used on an upper wave side, the output end of the transceiver module is coupled with each output end of an upper wave in the multicast optical switch through a combiner; a filter is arranged between the wave separator and the transceiver module, and the filter is used for filtering out line ID signals from optical signals separated from each input end of the multicast optical switch. When the device disclosed by the invention is used for configuring the wavelength division multiplexing transmission system, the complexity of manual configuration can be simplified, and the configuration accuracy can be improved. And the efficiency of updating the system and overhauling the system is greatly improved.