Abstract: A method and a system for anonymous communication are disclosed in the present invention, which are applied in an architecture network with Identification (ID) identifier and locator separation. The method includes: after receiving an anonymous communication request initiated by a terminal, the network allocating an anonymous ID identifier to the terminal, and recording a state of the terminal as an anonymous communication state; when the terminal is in the anonymous communication state, an access gateway device where the terminal is located replacing a source access identifier in data message transmitted by the terminal with the anonymous ID identifier while receiving the data message; and replacing an anonymous ID identifier in data message transmitted to the terminal with the access identifier of the terminal while receiving the data message transmitted to the terminal.

Abstract: A method for implementing multicast service is disclosed, comprising: a multicast source sending a multicast service packet of which a destination address is configured to be a Group Access Identity (GAID) assigned to the multicast source; an Access Service Router (ASR) to which the multicast source belongs searching for a corresponding Group Router Identity (GRID) in the established GAID-GRID mapping table according to the GAID, and sending the multicast service packet to a General Switch Router (GSR); the GSR searching for a corresponding multicast tree according to the GRID of the multicast service packet, and sending the multicast service packet to the ASR in the service area; the ASR in the service area searching for a corresponding GAID in the established GAID-GRID mapping table according to the GRID, and sending the multicast service packet to the terminal under the ASR in the service area.

Abstract: A method and a system for anonymous communication are disclosed in the present invention, which are applied in an architecture network with Identification (ID) identifier and locator separation. The method includes: after receiving an anonymous communication request initiated by a terminal, the network allocating an anonymous ID identifier to the terminal, and recording a state of the terminal as an anonymous communication state; when the terminal is in the anonymous communication state, an access gateway device where the terminal is located replacing a source access identifier in data message transmitted by the terminal with the anonymous ID identifier while receiving the data message; and replacing an anonymous ID identifier in data message transmitted to the terminal with the access identifier of the terminal while receiving the data message transmitted to the terminal.

Abstract: A method for implementing multicast service is disclosed, comprising: a multicast source sending a multicast service packet of which a destination address is configured to be a Group Access Identity (GAID) assigned to the multicast source; an Access Service Router (ASR) to which the multicast source belongs searching for a corresponding Group Router Identity (GRID) in the established GAID-GRID mapping table according to the GAID, and sending the multicast service packet to a General Switch Router (GSR); the GSR searching for a corresponding multicast tree according to the GRID of the multicast service packet, and sending the multicast service packet to the ASR in the service area; the ASR in the service area searching for a corresponding GAID in the established GAID-GRID mapping table according to the GRID, and sending the multicast service packet to the terminal under the ASR in the service area.

Abstract: A device and method for eliminating narrow-band interference by windowing in a spread spectrum system are disclosed. The method comprises extracting N sampling points of data to perform frequency spectrum transform each time and obtaining N points of data; updating control information, comparing the energy values of the N points with the threshold within the set time period to determine the number of narrow-band interference as well as the width and location of the interference; determining the corresponding frequency domain adjusting window based on the width and location of the narrow band interference, obtaining the points within the window and the adjusted values of those points; with regard to the transformed N points during interference elimination process, setting the energy values of the points within the window during the current time period and the last period as the corresponding adjusted values, outputting the points after frequency spectrum inverse transform.

Abstract: Narrow-band interference in spread spectrum systems is eliminated by performing a frequency spectrum transform on N sampling points of the data to obtain N points of data; after M transforms, getting an energy accumulation of individual data to obtain N energy values; removing partial excessive large values from the N energy values, averaging the rest, then calculating the threshold value for interference determination based on the average value; identifying all points that have energy values exceeding the threshold value, and performing interference suppression for the data of corresponding points after frequency spectrum transform and finally outputting the data after frequency spectrum inverse transform.

Abstract: A method and device for eliminating narrow-band interference in spread spectrum system, wherein the method comprises the steps of: extracting N sampling points of the data to perform frequency spectrum transform each time and obtaining N points of data; getting the energy sum of individual data after M times of transform, obtaining N energy values, in which M?1; removing partial excessive large values from N energy values and averaging the rest, then calculating the threshold value for interference determination based on the average value; obtaining the identification information of the points that have energy values exceeding the threshold value from N energy values and performing interference suppression for the data of corresponding points after frequency spectrum transform and finally outputting the data after frequency spectrum inverse transform.

Abstract: A device and method for eliminating narrow-band interference by way of windowing in a spread spectrum system, wherein the device comprises of a frequency spectrum transform unit, an interference elimination unit, an interference elimination control unit and a frequency spectrum inverse transform unit.