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    Encrypted communications
    24.
    发明专利
    Encrypted communications 未知

    公开(公告)号：GB2454871A

    公开(公告)日：2009-05-27

    申请号：GB0722497

    申请日：2007-11-16

    Applicant: MOTOROLA INC

    Inventor： KAEHLER MORTEN ,  CHATER-LEA DAVID JOHN ,  PEDERSEN KRISTIAN GRONKJAER ,  KRUEGEL CHRIS ARTHUR

    IPC: H04W12/00 ,  H04L12/22 ,  H04W12/06 ,  H04W12/08 ,  H04W12/10 ,  H04W12/12

    Abstract: A communication system (100) including a group management processor (144) operable to divide an enlarged group of user terminals formed by patching of smaller groups into sub-sets of user terminals including: (1) an encrypted sub-set of terminals (103,113, 123) which are operable to undertake only encrypted communications; and (2) a selectable-clear sub-set of terminals (105, 115, 125) which includes: (i) selectable terminals that are able to undertake clear communications and, when selected, encrypted communications; and (ii) clear terminals that are operable to undertake only clear communications; and a translator (143) operable to translate a communication sent in a first encrypted form from a user terminal (103) of one of the sub-sets into the second encrypted form suitable for decryption by user terminals (105, 115) of the other sub-set.

    Ad-hoc communication network and method
    25.
    发明专利
    Ad-hoc communication network and method 未知

    公开(公告)号：GB2413731B

    公开(公告)日：2008-11-26

    申请号：GB0409473

    申请日：2004-04-28

    Applicant: MOTOROLA INC

    Inventor： THEISEN NANNA SVANE ,  FRANDSEN SVEND ,  CHATER-LEA DAVID JOHN ,  PETERSEN STEEN

    IPC: H04L12/28 ,  H04B7/00 ,  H04L12/66 ,  H04M3/42 ,  H04N7/16 ,  H04N7/173 ,  H04W8/04 ,  H04W8/06 ,  H04W8/12

    Abstract: A method of controlling location information of subscribers 210, 212, 222 in a wireless, ad-hoc communications network 200. The network 200 comprises a plurality of nodes (base stations) 204, 216, 226 wherein each of the nodes has a Visitor Location Register (VLR) 208, 220, 230 and at least a portion of the nodes are provided with Home Location Registers (HLRs) 206, 218 228. When an operation of a first node 216 is to be reconfigured, for example, due to the addition of a new node or disconnection or movement of the first node 216, at least a part of the records from a first HLR 218 assigned to the first node 216 is transferred to at least one of the other nodes 226 of the network 200. The transfer is preferably controlled by a control unit which selects the target node(s) 226 and creates a back-up copy of the first HLR 218 which can be used if an error occurs during the transfer. Depending on circumstances, all or only part of the HLR records can be transferred and the transferred records can be assigned to a new HLR at the target node(s), which may or may not already have a HLR, or merged with records in a HLR already at the target node(s).

    METHOD OF PERFORMING ENCRYPTED COMMUNICATION IN A WIRELESS COMMUNICATION SYSTEM
    26.
    发明专利
    METHOD OF PERFORMING ENCRYPTED COMMUNICATION IN A WIRELESS COMMUNICATION SYSTEM 未知

    公开(公告)号：GB2407000A

    公开(公告)日：2005-04-13

    申请号：GB0323608

    申请日：2003-10-09

    Applicant: MOTOROLA INC

    Inventor： JOHUR JASON J ,  BUCHWINKLER HELMUT ,  CHATER-LEA DAVID JOHN ,  SOWA HANS C

    IPC: H04W12/00 ,  H04L29/06

    Abstract: A method (300) for performing encrypted communication in a wireless communication system having a centralised network operably coupled to a serving communication unit that wirelessly communicates with a plurality of remote communication units. The method comprises the steps of transmitting an encrypted message, preferably a registration message, from one of the plurality of remote communication units to the serving communication unit where the serving communication unit does not contain a key to decrypt the encrypted message. The serving communication unit (122) stores (335) the encrypted message and retrieves (330) a key from the centralised network to facilitate decryption of the encrypted message. A communication system and associated communication units are also described. In storing encrypted messages such as registration messages, coupled with a key retrieval mechanism, mobile subscriber units are able to perform encrypted registration without either the subscriber unit or the system knowing where or when the encrypted registration request will be made.

    Mobile station, system and method for use in wireless communications
    28.
    发明专利
    Mobile station, system and method for use in wireless communications 未知

    公开(公告)号：GB2433859B

    公开(公告)日：2008-04-16

    申请号：GB0526485

    申请日：2005-12-29

    Applicant: MOTOROLA INC

    Inventor： CHATER-LEA DAVID JOHN ,  LUCAS RICHARD C

    IPC: H04W16/28

    Abstract: A mobile station (101) for use in a wireless communication system includes a steerable antenna, means for obtaining location information relating to a current location of the mobile station and a steering controller for controlling a pointing direction of the steerable antenna using the location information and characterized in that the mobile station includes a memory holding a database of optimal pointing directions of the steerable antenna for given locations and the steering controller is operable to steer the antenna to the optimal pointing direction indicated in the database for the current location. Also described is a system and a method in which the mobile station operates.

    Communication network and method
    30.
    发明专利
    Communication network and method 未知

    公开(公告)号：GB2414630B

    公开(公告)日：2006-09-13

    申请号：GB0411699

    申请日：2004-05-26

    Applicant: MOTOROLA INC

    Inventor： PETERSEN STEEN ,  CHATER-LEA DAVID JOHN

    IPC: G06F15/16 ,  H04L12/56 ,  H04W84/18 ,  H04W88/16 ,  H04W92/02

    Abstract: In a typical cellular network, when a call is received at a gateway, the gateway will be connected to the HLR (Home Location Register) which allows the call to be routed to a mobile subscriber. In an ad-hoc (e.g. TETRA or private) network however, the network layout may be constantly changing, and so the gateway may not be connected to a HLR which causes a delay in routing the call to a subscriber. This problem is solved by providing a look up table at each node (base station) which holds the location of the node which contains the HLR for each subscriber. Therefore, at each node when a subscriber registers there will be a pointer to the node which contains the HLR for the subscriber. Also, each HLR is assigned a node which has a link to a gateway.

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