Abstract: A Photonic Crystal Fiber (PCF) a method of its production and a supercontinuum light source comprising such PCF. The PCF has a longitudinal axis and includes a core extending along the length of said longitudinal axis and a cladding region surrounding the core. At least the cladding region includes a plurality of microstructures in the form of inclusions extending along the longitudinal axis of the PCF in at least a microstructured length section. In at least a degradation resistant length section of the microstructured length section the PCF includes hydrogen and/or deuterium. In at least the degradation resistant length section the PCF further includes a main coating surrounding the cladding region, which main coating is hermetic for the hydrogen and/or deuterium at a temperature below Th, wherein Th is at least about 50° C., preferably 50° C.<Th<250° C.

Abstract: An optical fiber having an axial direction and a cross section perpendicular to the axial direction, and a method and preform for producing such an optical fiber. The optical fiber is adapted to guide light at a wavelength ?, and includes a core region, an inner cladding region surrounding said core region, and at least one of a first type of feature including a void and a surrounding first silica material. The core, the inner cladding region and the first type of feature extends along said axial direction over at least a part of the length of the optical fiber. The first silica material has a first chlorine concentration of about 300 ppm or less.

Abstract: This invention relates to a method in a communication system comprising a gateway and a server. The method comprises: sending a request for establishment of a communication tunnel from the gateway to the server; transmitting a secret from the server to the gateway in response to receiving the request in the server; establishing a communication tunnel by connecting a tunnel client in the gateway to a tunnel server in the server using the received secret; receiving data from a device connected to the gateway and transmitting at least a portion of the data to the tunnel server via the communication tunnel.

Abstract: This invention relates to a method in a communication system comprising a gateway and a server. The method comprises: sending a request for establishment of a communication tunnel from the gateway to the server; transmitting a secret from the server to the gateway in response to receiving the request in the server; establishing a communication tunnel by connecting a tunnel client in the gateway to a tunnel server in the server using the received secret; receiving data from a device connected to the gateway and transmitting at least a portion of the data to the tunnel server via the communication tunnel.

Abstract: A system and method for monitoring congestion in a communication system including an external packet switched network. The communication system includes a plurality of interconnected host devices, such as base stations, consoles, zone controllers. To determine the presence of congestion on links between a pair of host devices, a series of sequential packets are transmitted between the pair. The sequentially transmitted packets are then monitor fluctuations in transmission delays and lost packets. These two criteria are used to identify congestion levels present on the various links in the communication system, and communications on the relevant interzone link are controlled based on the identified congestion level.

Abstract: A mobile communication system (100) includes an infrastructure (121) including at least a first base transceiver station (123) and a plurality of mobile stations (101, 103), wherein each of the mobile stations is operable to detect interference by jamming to a signal sent on a downlink channel by the first base transceiver station and, when it determines that such interference exists, to send a notification message to the infrastructure.

Abstract: The present invention relates to communication system comprising first and second communication devices (11,12) each capable of communicating with a telecommunications network (10), and both being connectable to each other by a data link (17) for information transfer and to a method for operating the same. The first communication device (11) contains individual information, and the second communication device (12) comprises a special memory area (21) for storing individual information acquired from the first communication device (11). To enable an improved and facilitated usage of the system comparator means (22) for comparing the individual information contained in the first communication device (11) with that stored in the special memory area (21) of the second communication (12) device are provided.

Abstract: In a communication device (20) comprising a message function (SMS, Short Message Service) a certain short message (7) or other reply message is sent in response to an incoming call in a situation where the user can't answer the call him/herself. The reply message can be sent immediately (9) or after a short delay (10, 11), whereby during the delay, the user can choose, whether he/she answers him/herself. The calling party (5) is identified from the CLI information (Caller Line Identity), whereby the reply message can be chosen according to the calling party. Time information can be included in the reply message in order to express at which time by the clock or after a how long time the receiving party is reachable. After that time the automatic reply function based on the reply message is automatically disconnected.

Abstract: A method (200) of operation in a communication system (100) including a plurality of hosts (105, 115, 125) a controller (133) operable to allocate resources for communications to be sent between hosts in the system, and a network of routers (102, 112, 122) operable to route communications between the hosts by multicast transmission, the method including the controller sending (213) to target routers associated with target hosts which are to receive a communication from a sending host a prompt message prompting the target routers to form a multicast tree via which the communication is to be deliverable.

Abstract: A mobile communication system (100) includes an infrastructure (121) including at least a first base transceiver station (123) and a plurality of mobile stations (101, 103), wherein each of the mobile stations is operable to detect interference by jamming to a signal sent on a downlink channel by the first base transceiver station and, when it determines that such interference exists, to send a notification message to the infrastructure.

Abstract: A system and method for monitoring congestion in a communication system including an external packet switched network. The communication system includes a plurality of interconnected host devices, such as base stations, consoles, zone controllers. To determine the presence of congestion on links between a pair of host devices, a series of sequential packets are transmitted between the pair. The sequentially transmitted packets are then monitor fluctuations in transmission delays and lost packets. These two criteria are used to identify congestion levels present on the various links in the communication system, and communications on the relevant interzone link are controlled based on the identified congestion level.

Abstract: The present invention relates to communication system comprising first and second communication devices (11,12) each capable of communicating with a telecommunications network (10), and both being connectable to each other by a data link (17) for information transfer and to a method for operating the same. The first communication device (11) contains individual information, and the second communication device (12) comprises a special memory area (21) for storing individual information acquired from the first communication device (11). To enable an improved and facilitated usage of the system comparator means (22) for comparing the individual information contained in the first communication device (11) with that stored in the special memory area (21) of the second communication (12) device are provided.

Abstract: The present invention relates to a mobile communication device having a speech recognition for selecting and activating device function by acoustic input. Particularly, the present invention relates to a backup method to be used in case of failure of the speech recognition offering an advantageous method for selecting and activating the device functions operable with speech recognition by operation of switches and keys in an easy and fast way. The device functions, i.e. especially dialing of telephone numbers, are organized in data records. On receiving a user input, a list of the data records is displayed to the user. On receiving a further user input, one of the displayed list of data records is identified and an instruction is transmitted to at least one of several applications executed on the mobile communication device.

Abstract: The invention relates to a cellular telecommunications system having n cells (1,2), each of which is assigned an antenna (4,5) via which a base station (3) can transmit and receive, all n cells being assigned only one common base station with n antennas which can be switched over, and n being ≧2.

Abstract: In a communication device (20) comprising a message function (SMS, Short Message Service) a certain short message (7) or other reply message is sent in response to an incoming call in a situation where the user can't answer the call him/herself. The reply message can be sent immediately (9) or after a short delay (10, 11), whereby during the delay, the user can choose, whether he/she answers him/herself. The calling party (5) is identified from the CLI information (Caller Line Identity), whereby the reply message can be chosen according to the calling party. Time information can be included in the reply message in order to express at which time by the clock or after a how long time the receiving party is reachable. After that time the automatic reply function based on the reply message is automatically disconnected.

Abstract: In a communication device (20) comprising a message function (SMS, Short Message Service) a certain short message (7) or other reply message is sent in response to an incoming call in a situation where the user can't answer the call him/herself. The reply message can be sent immediately (9) or after a short delay (10, 11), whereby during the delay, the user can choose, whether he/she answers him/herself. The calling party (5) is identified from the CLI information (Caller Line Identity), whereby the reply message can be chosen according to the calling party. Time information can be included in the reply message in order to express at which time by the clock or after a how long time the receiving party is reachable. After that time the automatic reply function based on the reply message is automatically disconnected.