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    53.
    发明专利
    未知

    公开(公告)号：DE60309457D1

    公开(公告)日：2006-12-14

    申请号：DE60309457

    申请日：2003-03-03

    Applicant: MOTOROLA INC ,  MOTOROLA LTD

    Inventor： BAR-ON DAVID ,  SHAHAF MARK ,  SERFATY SALOMON ,  HASSON BARUH

    IPC: G01S5/06 ,  G01S5/00 ,  G01S5/02 ,  H04W64/00

    Abstract: A method for use in a mobile communication system for estimating the location of a target mobile station (MS) which includes receiving signals from the target MS (N) at a plurality of receivers (MS 1 , MS 2 , MS 3 ) in different locations and calculating the location of the target MS (N) from information obtained from the received signals, wherein at least one of the receivers (MS 1 ) is a searching MS and wherein the calculation of location is carried out by the searching MS (MS 1 ). The method may involve the target MS and the searching MS or MSs communicating by a direct mode of operation (DMO) link. The searching MSs may conveniently have GPS attachments. A mobile station which may be used as the target MS or as a searching MS and a system incorporating the same is also disclosed.

    Wireless communication system, communication unit and method of communication
    54.
    发明专利
    Wireless communication system, communication unit and method of communication 未知

    公开(公告)号：GB2384139B

    公开(公告)日：2004-08-18

    申请号：GB0200755

    申请日：2002-01-15

    Applicant: MOTOROLA INC

    Inventor： SHAHAF MARK ,  SERFATY SALOMON

    IPC: H04B7/26 ,  H04W12/00 ,  H04L12/22

    Abstract: A wireless communications system 300 includes a wireless serving communication unit 322 serving a plurality of remote units 312-316 with a communication resource 318-320. The at least one wireless serving communication unit 322 includes a transmitter (421, see figure 4) for transmitting data on an outbound communication resource, and a receiver (422, see figure 4) for receiving a communication on an inbound communication resource, wherein said inbound and outbound resources have a variable communication resource offset. Said resource offset may be a frequency difference between inbound and outbound resources in FDD or a inbound and outbound timeslot separation in TDD. Information relating to said resource offset may be encrypted and transmitted to at least one of said remote units. Also disclosed is a communication unit 322-332, 312-316 adapted to operate in said communications system 300, and a method of communication. By using a variable communication resource offset, the potential for a third party to jam a communication between the wireless serving unit 322 and a remote unit 312-316 is reduced.

    Disabling a mobile telephone function in an inactive state
    55.
    发明专利
    Disabling a mobile telephone function in an inactive state 未知

    公开(公告)号：GB2382953A

    公开(公告)日：2003-06-11

    申请号：GB0128952

    申请日：2001-12-04

    Applicant: MOTOROLA INC

    Inventor： SHAHAF MARK ,  SERFATY SALOMON ,  PRIESTER GAVRIEL

    IPC: H04M1/725 ,  H04W52/02 ,  H04Q7/32

    Abstract: In order to prevent unintentional actuation of a mobile telephone function, one or more functions are disabled while it is detected that the telephone is in an inactive state. The disabled function may include the transmission of a call set-up signal, the receiving of data messages, or the replacement of an audible call announcement by a vibratory one. Some or all of the functions operated by the keypad may be disabled. In the embodiments described, the inactive state is detected when the telephone (1) is placed in a holder (2). Detection may be by a magnet (4) in the holder which switches a Hall effect device (3) on the telephone, by mechanical actuation of a switch, or by a light or infra-red actuated switching device.

    Encrypting/decrypting information in a wireless communication system
    56.
    发明专利
    Encrypting/decrypting information in a wireless communication system 未知

    公开(公告)号：GB2379588A

    公开(公告)日：2003-03-12

    申请号：GB0121979

    申请日：2001-09-11

    Applicant: MOTOROLA INC

    Inventor： CHATER-LEA DAVID JOHN ,  SHAHAF MARK

    IPC: H04W12/00 ,  H04L9/00

    Abstract: A method of encrypting information to be transmitted in a wireless communication system employing an encryption protocol that uses an encryption key, the method characterised by the steps of: ```combining an individual identifier (e.g. a layer-2 MAC identity) related to a transmission sender with a shared key related to a type of transmission to form a transmission encryption key; and ```encrypting a transmission using said transmission encryption key. The invention could be applied in an internet protocol (IP) data network, where the layer-3 source ID of a packet could be used as a key modifier in a transmission where the contents of the packet are encrypted. Furthermore, the shared key may relate to any type of transmission, such as an emergency group call, pre-emptive priority call, an encrypted broadcast call or any other mobile radio communication where encryption is used. The system is operable in a direct mode of operation (DMO) and the manner of combining the individual identifier with a shared key can be changed, the change being notified to other users of the shared key.

    Method of Allocating Time Slots in a Communication System
    60.
    发明专利
    Method of Allocating Time Slots in a Communication System 未知

    公开(公告)号：GB2318481A

    公开(公告)日：1998-04-22

    申请号：GB9621557

    申请日：1996-10-16

    Applicant: MOTOROLA INC

    Inventor： CARMON RAFY ,  SHAHAF MARK ,  RICHARDSON JULIAN HOWARD ,  AITKENHEAD GARY

    IPC: H04B7/26

    Abstract: A method of allocating time slots for a communication at a first frequency between a first and a second unit in a communications system comprises the steps of: determining the existence of a current communication on a second frequency different to the first between a third and fourth unit in the communications system, and if there is a current communication, assigning different time slots for the communication between the first and second unit. This reduces the possibility of transmission by one unit operating in close proximity of another blocking reception of signals by the another unit.

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