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    AUTOMATIC SEAMLESS VERTICAL ROAMING BETWEEN WLANS AND WWANS
    43.
    发明专利
    AUTOMATIC SEAMLESS VERTICAL ROAMING BETWEEN WLANS AND WWANS 未知

    公开(公告)号：CA2398185A1

    公开(公告)日：2002-07-11

    申请号：CA2398185

    申请日：2001-12-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ

    IPC: H04L12/28 ,  H04L12/56 ,  H04W36/14 ,  H04Q7/38

    Abstract: A Mobile Station (MS) is able to vertically roam in either direction between two different network, i.e. WWAN and WLAN. The MS is equipped with a dual mo de Radio for WWAN and WLAN transmissions. The WLAN Radio is linked to a WLAN Enterprise Gateway Controller (EGC) via a first air link and the WWAN Radio is linked to a WWAN Base Transceiver Station (BTS) via a second air link. The E GC is connected to a Mobile Switching Center (MSC) which is in turn connected t o the BTS. An outgoing VoIP call from the WLAN Radio to a remote party on the WWAN will transition or seamlessly switch over to a WWAN connection when the MS detects packet error rates, frequent scale back or consistent signal degradation. Upon such conditions, the WLAN Radio requests the EGC to reques t an Explicit Call Transfer via the MSC to the MS integrated WWAN Radio portio n which automatically accepts the call based on referenced information stored in the user's subscriber identification module (SIM). Once the WWAN Radio is confirmed connected to the remote party on the WWAN, the WLAN Radio drops th e WLAN connection. An incoming call between the MS and a remote user via the WWAN will transition to the WLAN Radio when the MS enters WLAN coverage. The MS issues an ECT to the WLAN. After user verification by the WLAN Radio and theEGC signals acceptance of the call, the WWAN Radio connection is dropped and the call is now established between the WLAN Radio and the remote party on the WWAN.

    44.
    发明专利
    未知

    公开(公告)号：DE69428655D1

    公开(公告)日：2001-11-22

    申请号：DE69428655

    申请日：1994-11-11

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ ,  GOREN DAVID

    IPC: G06K7/10

    Abstract: A multi-bit digitizer (30) for a barcode reader detects the presence of edges of a scanned barcode symbol, and also measures the strength of each detected edge. A polarity or edge direction signal (8) indicates the direction of each detected edge, and a timing signal (6) is representative of the timing and also, by means of a variable pulse width, the strength of each edge. A gating signal (200) indicates that the data are unreliable and invalid if the measured voltage applied to the scanner motor of the barcode reader is higher or lower than defined limit values. Any scans made at a speed which were too high or too low are rejected.

    LASER SCANNING SYSTEM COMPACT BAR CODE SCANNING MODULE WITH SHOCK PROTECTION
    46.
    发明专利
    LASER SCANNING SYSTEM COMPACT BAR CODE SCANNING MODULE WITH SHOCK PROTECTION 未知

    公开(公告)号：CA2136046A1

    公开(公告)日：1995-05-18

    申请号：CA2136046

    申请日：1994-11-17

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ ,  KATZ JOSEPH ,  GOREN DAVID P ,  DVORKIS PAUL ,  LI YAJUN

    IPC: G06K7/10 ,  G06K9/18

    Abstract: LASER SCANNING SYSTEM COMPACT BAR CODE SCANNING MODULE WITH SHOCK PROTECTION Optical scanning of barcode symbols is carried out first in an aim mode wherein the symbol is scanned using a first scan pattern that is relatively small and dense so as to be visible to the user, and thereafter using a second, larger, more robust scan pattern for decoding. The preferred scanner module has a scanner mirror which is mounted to a bracket by way of a leaf spring, allowing the mirror to oscillate in one direction. This is hung from a stationary chassis by means of two strips of mylar film, which are themselves protected against mechanical shock by pins which pass through holes in the bracket. The pins provide accurate alignment of the bracket with respect to the chassis.

    Object Location Method and System Using RFID
    47.
    发明专利
    Object Location Method and System Using RFID 未知

    公开(公告)号：AU2010200808A1

    公开(公告)日：2010-03-25

    申请号：AU2010200808

    申请日：2010-03-03

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ ,  DURON MARK WILLIAM ,  STRZELCZYK MARTIN J

    IPC: G01S13/32 ,  G01S13/34 ,  G01S13/87

    Abstract: A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter modulated signals. The RFID reader receives and demodulates the plurality of backscatter modulated signals. The distance calculator determines the phase of the plurality of backscatter modulated signals and determines a rate of change of the phase in the backscatter modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

    48.
    发明专利
    未知

    公开(公告)号：DE60141162D1

    公开(公告)日：2010-03-11

    申请号：DE60141162

    申请日：2001-12-27

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： BRIDGELALL RAJ

    IPC: H04W36/14 ,  H04L12/28 ,  H04L12/56

    Abstract: A Mobile Station (MS) is able to vertically roam in either direction between two different networks, i.e., WWAN and WLAN. The MS is equipped with a dual mode Radio for WWAN and WLAN transmissions. The WLAN Radio is linked to a WLAN Enterprise Gateway Controller (EGC) via a first air link and the WWAN Radio is linked to a WWAN Base Transceiver Station (BTS) via a second air link. An outgoing VoIP call from the WLAN Radio to a remote party on the WWAN will transition or seamlessly switch over to a WWAN connection when the MS detects packet error rates, frequent scale back or consistent signal degradation.

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