Abstract: Provided is a technique for eliminating buffer and transfer of a packet which is not required for an MN in a handover mechanism in which a packet to be sent to the MN performing handover is buffered and the buffered packet is supplied to the MN after the handover. Before handover, a mobile terminal (MN) notifies an access router (nAR) to be newly connected after the handover of information (buff_time/flow) indicating a correspondence between a flow label of a packet concerned with packet communication and a buffer time based on a delay allowance time of an application using the packet having the flow label. The nAR buffers the packet while the MN performs the handover. When performing packet transfer to the MN connected after the handover, the nAR does not transfer, to MN, the packet stored for a predetermined buffer time or more among the packets stored in the buffer.

Abstract: A mobile node stores information identifying a number of possible mobility registration servers so that it can select a server based on its geographical location rather than simply using its default server. Selection will depend on the type of ID data stored. If partially completed FQDNs are stored, a country code is added to see if this corresponds to a local server. Alternatively IP addresses can be stored and chosen by prefix matching with a Care-of-Address.

Abstract: A method of establishing communication protocols between a mobile node and a home agent in a mobile communications networks. The method uses the steps of: generating, at the mobile node plural care of addresses (CoAs) and a corresponding number of security parameter indices; sending the generated CoAs and security parameter indices to the home agent in an encrypted form; generating, at the home agent, on the basis of the received CoAs and security parameter indices, an equal number of home addresses (HoAs) and associated security parameter indices; sending the list of HoAs and associated security parameter indices generated at the home agent to the mobile node, and; using the generated CoAs, HoAs and associated security parameter indices as the basis for communication protocol addresses and encryption for communication between the home agent and the mobile node. A system employing the method is also provided.

Abstract: A method of managing switching of a virtual private network (VPN) tunnel termination point from a first address to a second address. The VPN operates between a fixed network node and a mobile node which defines the termination point. The address of the mobile mode is switched from the first address to the second address and a notification from the mobile node to the fixed node is sent to indicate that the address of the mobile has changed from the first address to the second address. Verification of the trustworthiness of the second address is also then made. A searching manager for performing the method is also disclosed.

Abstract: In order to appropriately control transmit power of a common channel for an MBMS (Multimedia Broadcast/Multicast Service) so as not to become excessive, a mobile station 1 transmits a TPC command for an S-CCPCH to a base station through an uplink DPCH1 and a mobile station 2 transmits a TPC command for an S-CCPCH to the base station through an uplink DPCH2. When either one of the TPC command for the S-CCPCH transmitted from the mobile station 1 and the TPC command for the S-CCPCH transmitted from the mobile station 2 is a TPC command instructing “Up”, the base station increases transmit power of the downlink S-CCPCH and decreases transmit power of the downlink S-CCPCH when both TPC commands instruct “Down”.

Abstract: There is disclosed a technique whereby, in a case wherein a mobile node (MN) performs a handover, between access points (APs) present on the links of different access routers (ARs), security is quickly established between the MN and the AP so as to reduce the possibility of a communication delay or disconnection due to the handover. According to this technique, before performing a handover, the MN 10 transmits, to an access router (nAR) 30 that is to be newly connected after the handover, a notification indicating an MAC address for the MN and a communication encryption/decryption key used with the AP 21 before the handover, and the nAR transmits a notification for this information to the AP 31, to which the MN is to be connected after the handover. Therefore, the MN can employ the communication encryption/decryption key used before the handover and communicate with the AP after the handover.

Abstract: A technology is disclosed that can reduce delay time and multicast packet loss occurring when a reception side communication device using radio communication performs a handover, and actualize multicast technology taking into consideration mobility (particularly PIM-SM taking into consideration mobility). Based on the technology, when a reception side communication device (listener) 16 performing radio communication is in a state of receiving a multicast packet transmitted from a transmission source communication device (source) 11, via a rendezvous point (RP) 13 and a PIM-SM router 14, and the reception side communication device tries to perform a handover, the reception side communication device transmits a handover declaration message including identifying information of an access point to which the reception side communication device connects after the handover, to the PIM-SM router 14 to which the reception side communication device is currently connected.

Abstract: There is disclosed a technique for eliminating buffer and transfer of a packet which is not required for an MN in a handover mechanism in which a packet to be sent to the MN performing handover is buffered and the buffered packet is supplied to the MN after the handover. According to the technique, before the handover, a mobile terminal (MN) (110) notifies an access router (nAR) (130) to be newly connected after the handover of information (buff_time/flow) indicating a correspondence between a flow label of a packet concerned with packet communication and a buffer time based on a delay allowance time of an application using the packet having the flow label. The nAR buffers the packet while the MN performs the handover. When performing packet transfer to the MN connected after the handover, the nAR does not transfer, to the MN, the packet stored for a predetermined buffer time or more among the packets stored in the buffer.

Abstract: A method of managing switching of a virtual private network (VPN) tunnel termination point from a first address to a second address. The VPN operates between a fixed network node and a mobile node which defines the termination point. The address of the mobile mode is switched from the first address to the second address and a notification from the mobile node to the fixed node is sent to indicate that the address of the mobile has changed from the first address to the second address. Verification of the trustworthiness of the second address is also then made. A searching manager for performing the method is also disclosed.

Abstract: A method of establishing communication protocols between a mobile node and a home agent in a mobile communications networks. The method uses the steps of: generating, at the mobile node plural care of addresses (CoAs) and a corresponding number of security parameter indices; sending the generated CoAs and security parameter indices to the home agent in an encrypted form; generating, at the home agent, on the basis of the received CoAs and security parameter indices, an equal number of home addresses (HoAs) and associated security parameter indices; sending the list of HoAs and associated security parameter indices generated at the home agent to the mobile node, and; using the generated CoAs, HoAs and associated security parameter indices as the basis for communication protocol addresses and encryption for communication between the home agent and the mobile node. A system employing the method is also provided.

Abstract: The present invention discloses a technique, by which it is possible to quickly decide a PMTU relating to a new data path after a handover even when a mobile node has performed the handover. According to this technique, a mobile node (MN) 10 for performing handover notifies an IP address of a correspondent node (CN) 40 performing communication before the handover to an access router newly connected (nAR) 30 after the handover. When nAR discovers and decides an optimal PMTU relating to a path to CN, and notifies the decided PMTU to MN when MN is connected under the control of nAR. As a result, MN sets up a PMTU relating to the data path to CN immediately after the handover and can transmit packet in optimal packet size. In particular, it is possible to notify the IP address of CN, with which MN has been communicating before the handover, to nAR by using the processing relating to FMIP.

Abstract: The present invention provides a technique to reduce time delay caused by message exchange or the like and to carry out fast handover. According to this technique, FBack is promptly returned by a mobile node (MN) without performing the processing (the processing to cause delay) that previous access router pAR transmits HI message in response to FBU message from MN and waits for HAck message. Specifically, a usable address (nCoA usable at subnet of nAR) is selected when MN is connected to nAR from a table in response to FBU from MN, and FBack including the nCoA is returned to MN promptly regardless of transmitting and receiving of HI/HAck message to and from nAR. As a result, it is possible, for instance, to reduce time delay caused by HI/HAck message exchange and to carry out fast handover.

Abstract: A dual mode (e.g. WLAN/UMTS) terminal with two network interfaces sends one interface to sleep mode following handover from one network to the other. Here sleep mode is synchronised with the end of the data stream, either by marking the stream or in response to sending a handover related SIP ACK message to the corresponding node.

Abstract: In order to appropriately control transmit power of a common channel for an MBMS (Multimedia Broadcast/Multicast Service) so as not to become excessive, a mobile station 1 transmits a TPC command for an S-CCPCH to a base station through an uplink DPCH1 and a mobile station 2 transmits a TPC command for an S-CCPCH to the base station through an uplink DPCH2. When either one of the TPC command for the S-CCPCH transmitted from the mobile station 1 and the TPC command for the S-CCPCH transmitted from the mobile station 2 is a TPC command instructing “Up”, the base station increases transmit power of the downlink S-CCPCH and decreases transmit power of the downlink S-CCPCH when both TPC commands instruct “Down”.

Abstract: A randmization section 101 makes the number of 1s and number of 0s of data the same. A coding section 102 performs coding processing on data in which the number of 1s and number of 0s have become the same. An HS-DSCH modulation and spreading section 103 performs M-ary modulation of the coded data, followed by spreading processing using a spreading code. Meanwhile, a common known signal undergoes M-ary modulation, followed by spreading processing using a spreading code, by a CPICH modulation and spreading section 104. The common known signal that has undergone spreading processing by CPICH modulation and spreading section 104 and data that has undergone spreading processing by HS-DSCH modulation and spreading section 103 are multiplexed by a multiplexing section 105. A multiplexed transmit signal is transmitted from a radio transmitting section 106. By this means, I-Q plane reference points can be found with a high degree of accuracy by means of a simple circuit configuration.

Abstract: Cellular telecommunication network includes a plurality of base stations, together with a plurality of positioning elements. In order to determine the position of mobile station, positioning signals are transmitted from positioning element and can be detected by mobile station. By detecting the time of arrival of the positioning signals, the network can determine the position of mobile station.

Abstract: Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an amplitude of a signal other than the TPC bit and an amplitude of the TPC bit, accumulating section 113 determines an increase or decrease of transmit power and an amount of the increase and decrease of the transmit power using a symbol of the TPC bit for the increase or decrease, and an amplitude ratio for the amount of the increase and decrease to instruct to transmission amplifier 104, and multiplying section 114 multiplies the amplitude of the signal other than the TPC bit by a correction value corresponding to the received quality to determine the amplitude of the TPC bit.

Abstract: Cellular telecommunication network 1 comprises a plurality of base station 4, 6, 7, together with a plurality of positioning elements 3, 5. In order to position mobile station 2, positioning signals are transmitted from positioning elements 3, 5 and can be detected by mobile station 2. By detecting the time of arrival of the positioning signals, the network 1 can determine the position of mobile station 2.