Abstract: A method and an apparatus for transmitting a 3D model associated to stereoscopic content are described, and more specifically a method and an apparatus for the progressive transmission of 3D models. Also described are a method and an apparatus for preparing a 3D model associated to a 3D video frame for transmission and a non-transient recording medium comprising such a prepared 3D model. The 3D model is split into one or more components. It is then determined whether a component of the one or more components is hidden by other 3D content. For transmission those components of the 3D model that are not hidden by other 3D content are transmitted first. The remaining components of the 3D model are transmitted subsequently.

Abstract: A method for transmission data in a system is provided. The system includes a first device, plurality of second devices, and plurality of third devices, the method includes steps of encrypting the data with a first key and encrypting the first key with a second key at the first device, sending the encrypted data from the first device to the second device, decrypting the second key and encrypting the first key with a third key by the second device, sending the encrypted data from the second device to the third device, and decrypting the third key and the first key by the third device.

Abstract: The present invention provides a method for sending a message to a network device with a specific MAC address, in an IP network implementing a interne group management protocol IGMP, comprising: sending, by a network terminal, to the network device, a multicast group management status message including a destination address set as the specific MAC address.

Abstract: An adaptive and scalable packet error correction apparatus and method in a wireless multicast network is provided. Each retransmission request from a receiver contains a round number and the number of repairs sent in that round. At each receiver, there are two counters for counting the rounds sent out on the network and the number of repairs that have been required. A receiver on the wireless multicast network listens to the ARQ requests sent by other receivers to update the two counters and determines whether its request should be suppressed or be sent out.

Abstract: It is provided a method for providing complementary information for principal information in a system having a first presentation device for presenting the principal information and a second presentation device for presenting the complementary information. The method comprises the steps of receiving a piece of principal information to be presented on the first presentation device; determining control information of at least one piece of complementary information associated with the received piece of principal information, wherein, the control information comprises a start time point for each piece of complementary information indicating when to present the complementary information, and sending an instruction message to instruct the second device to present the at least one piece of complementary information associated with the received piece of principal information based on the start time point contained in the control information and time information carried in the received piece of principal information.

Abstract: It provides a method for encoding a set of elements by using components defining the structure of each of the set of elements, wherein each element comprises data structure information and at least one data value. The method comprises the steps of: selecting a current element for encoding; determining whether the current element has the same data structure information as a previously encoded element; in the negative, encoding the data structure information of the current element and the at least one data value of the current element; and in the affirmative, encoding the at least one data value of the current element and providing an indication value associated with the current element indicating the current element has the same data structure information as said previously encoded element. The method is used to reduce the encoding redundancy of the structure information.

Abstract: A method and an apparatus for transmitting a 3D model associated to stereoscopic content are described, and more specifically a method and an apparatus for the progressive transmission of 3D models. Also described are a method and an apparatus for preparing a 3D model associated to a 3D video frame for transmission and a non-transient recording medium comprising such a prepared 3D model. The 3D model is split into one or more components. It is then determined whether a component of the one or more components is hidden by other 3D content. For transmission those components of the 3D model that are not hidden by other 3D content are transmitted first. The remaining components of the 3D model are transmitted subsequently.

Abstract: The present invention provides a method for sending a message to a network device with a specific MAC address, in an IP network implementing a interne group management protocol IGMP, comprising: sending, by a network terminal, to the network device, a multicast group management status message including a destination address set as the specific MAC address.

Abstract: In the context of IEEE 802.11 WLAN networks, enhancement to the Relaxed Deterministic Backoff (R-DEB) for random access of shared (Medium Access Control MAC) method. For all available candidate resource slots, a busy index is calculated that reflects the level of use/occupation in the past and infers a probability of use in the future by another concurring device. The method assumes the use of a sub-set of resource slots for transmission, and updates this set by replacing resource slots for which collisions are frequent with a not currently used candidate resource for which the busy index is the lowest. Passive Spoofing/overhearing of all resources for clear channel assessment (CCS) is used for resource monitoring purposes.

Abstract: It provides a method for encoding a set of elements by using components defining the structure of each of the set of elements, wherein each element comprises data structure information and at least one data value. The method comprises the steps of: selecting a current element for encoding; determining whether the current element has the same data structure information as a previously encoded element; in the negative, encoding the data structure information of the current element and the at least one data value of the current element; and in the affirmative, encoding the at least one data value of the current element and providing an indication value associated with the current element indicating the current element has the same data structure information as said previously encoded element. The method is used to reduce the encoding redundancy of the structure information.

Abstract: A method for transmission data in a system is provided. The system includes a first device, plurality of second devices, and plurality of third devices, the method includes steps of encrypting the data with a first key and encrypting the first key with a second key at the first device, sending the encrypted data from the first device to the second device, decrypting the second key and encrypting the first key with a third key by the second device, sending the encrypted data from the second device to the third device, and decrypting the third key and the first key by the third device.

Abstract: An adaptive and scalable packet error correction apparatus and method in a wireless multicast network is provided. Each retransmission request from a receiver contains a round number and the number of repairs sent in that round. At each receiver, there are two counters for counting the rounds sent out on the network and the number of repairs that have been required. A receiver on the wireless multicast network listens to the ARQ requests sent by other receivers to update the two counters and determines whether its request should be suppressed or be sent out.