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    METHOD AND SUBSCRIBER UNIT FOR PERFORMING AN ACCESS PROCEDURE
    31.
    发明专利
    METHOD AND SUBSCRIBER UNIT FOR PERFORMING AN ACCESS PROCEDURE 未知

    公开(公告)号：CA2818770A1

    公开(公告)日：1997-12-31

    申请号：CA2818770

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH M ,  LOMP GARY R

    IPC: H04W76/02 ,  H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60

    Abstract: A communication method for use with a code division multiple access (CDMA) subscriber unit is disclosed. The method includes generating a first code wherein the first code has a first length and generating a second code wherein the second code has a second length greater than the first length and a period which is aligned with the length of the first code. A first radio frequency signal is transmitted from an antenna of the CDMA subscriber unit wherein the first radio frequency signal carries the first code at a first power level, at least a portion of the second code, and data. In an absence of an acknowledgement signal received by the CDMA subscriber unit, a power level of the first code is set to a second power level wherein the second power level is greater than the first power level.

    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    36.
    发明专利
    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES 未知

    公开(公告)号：CA2578405C

    公开(公告)日：2010-01-12

    申请号：CA2578405

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： LOMP GARY R ,  OZLUTURK FATIH M

    IPC: H04W52/04 ,  H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/08 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60 ,  H04W68/02

    Abstract: A base station using a method of controlling initial power ramp-up in CDMA systems by using short codes is disclosed for controlling transmission power during the establishment of communications between a base station and another communicating unit is disclosed. The base station includes means for detecting a periodic signal having an initial predetermined power level, which is repeatedly sent to the base station at increasing power levels; means for transmitting a confirmation signal when a periodic signal having a sufficient power for detection is received; and means for receiving a call signal and transmitting closed loop power commands to control transmission level of the call signal. The disclosed base station is particularly useful for overcoming the problems of power overshoot and interference to other base stations known in the art and to provide for a base station to quickly synchronize to the spreading code used by the communicating unit.

    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    38.
    发明专利
    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES 未知

    公开(公告)号：CA2577444C

    公开(公告)日：2009-11-24

    申请号：CA2577444

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH M ,  LOMP GARY R

    IPC: H04W52/50 ,  H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/60

    Abstract: A wireless code division multiple access (CDMA) subscriber unit comprising: a transmitter configured such that, when the subscriber unit is first accessing a CDMA network and wants to establish communications with a base station associated with the network over a communication channel to be indicated by the base station, the transmitter successively transmits signals until the subscriber unit receives from the base station an indication that a transmitted one of the signals has been detected by the base station, wherein each transmission of one of the signals by the transmitter is at an increased power level with respect to a prior transmission of one of the signals; the transmitter further configured such that the transmitter transmits to the base station a message indicating to the base station that the subscriber unit wants to establish the communications with the base station over the communication channel to be indicated by the base station, the message being transmitted only subsequent to the subscriber unit receiving the indication, wherein the successively transmitted signals and the message are generated using a same code.

    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    40.
    发明专利
    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES 未知

    公开(公告)号：CA2413948C

    公开(公告)日：2008-11-18

    申请号：CA2413948

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

    Inventor： OZLUTURK FATIH M ,  LOMP GARY R ,  HAIM JOHN W

    IPC: H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60

    Abstract: A base station using a method of controlling initial power ramp-up in CDMA systems by using short codes is disclosed for controlling transmission power during the establishment of communications between a base station and another communicating unit is disclosed. The base station includes means for detecting a periodic signal having an initial predetermined power level, which is repeatedly sent to the base station at increasing power levels; means for transmitting a confirmation signal when a periodic signal having a sufficient power for detection is received; and means for receiving a call signal and transmitting closed loop power commands to control transmission level of the call signal. The disclosed base station is particularly useful for overcoming the problems of power overshoot and interference to other base stations known in the art and to provide for a base station to quickly synchronize to the spreading code used by the communicating unit.

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