Abstract: The present invention discloses a method and apparatus for multicast management of user interface in a network access device, which comprises setting a user multicast information table for the user interface in the network access device, IGMP protocol processing unit obtaining the user identification information from a user IGMP message, retrieving and updating the user multicast information table based on types of multicast messages; checking the user multicast information table of the user interface when multicast resources of the user interface are not sufficient, immediately terminating the multicast GSQ process and directly performing quick-leaving when the user multicast information table of a multicast group is empty, in conjunction with use of items of multicast state. The present invention can greatly enhance speed and performance of switching for multicast channels of the network access device.

Abstract: A method for processing data synchronization includes a client terminal performing corresponding updating process for the updating data item transmitted from a server; storing the global unique identity (GUID) corresponding to the updating data item sent from the server; if this synchronization process is interrupted, after next synchronization process is re-initiated, the client terminal reporting the stored GUID to server memory; according to the stored result, the server transmitting GUID and the corresponding updating data items which are not included in the stored result in itself updating database to the client terminal, then returning to procedure. Correspondingly, the present disclosure also provides a client terminal, server and data synchronization system. The present disclosure enables to complete data synchronization normally even if the case that the data synchronization process is interrupted.

Abstract: The present invention discloses a method and apparatus for multicast management of user interface in a network access device, which comprises setting a user multicast information table for the user interface in the network access device, IGMP protocol processing unit obtaining the user identification information from a user IGMP message, retrieving and updating the user multicast information table based on types of multicast messages; checking the user multicast information table of the user interface when multicast resources of the user interface are not sufficient, immediately terminating the multicast GSQ process and directly performing quick-leaving when the user multicast information table of a multicast group is empty, in conjunction with use of items of multicast state. The present invention can greatly enhance speed and performance of switching for multicast channels of the network access device.