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    A METHOD OF CONTROLLING INITIAL POWER RAMP-UP IN CDMA SYSTEMS BY USING SHORT CODES
    64.
    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：CA2259351A1

    公开(公告)日：1997-12-31

    申请号：CA2259351

    申请日：1997-06-23

    Applicant: INTERDIGITAL TECH CORP

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

    IPC: H04B1/707 ,  H04B7/216 ,  H04J13/16 ,  H04L7/00 ,  H04W52/36 ,  H04W52/50 ,  H04W52/60 ,  H04B7/005 ,  H04Q7/22

    Abstract: A system and method of controlling transmission power during the establishme nt of a channel in a CDMA communication system utilize the transmission of a short code from a subscriber unit to a base station during initial power ram p- up. The short code is a sequence for detection by the base station which has a much shorter period than a conventional spreading code. The ramp-up starts from a power level that is guaranteed to be lower than the required power level for detection by the base station. The subscriber unit quickly increas es transmission power while repeatedly transmitting the short code until the signal is detected by the base station. Once the base station detects the short code, it sends an indication to the subscriber unit to cease increasin g transmission power. The use of short codes limits power overshoot and interference to other subscriber stations and permits the base station to quickly synchronize to the spreading code used by the subscriber unit.

    METHOD AND SUBSCRIBER UNIT FOR PERFORMING AN ACCESS PROCEDURE
    65.
    发明专利
    METHOD AND SUBSCRIBER UNIT FOR PERFORMING AN ACCESS PROCEDURE 未知

    公开(公告)号：CA2818770C

    公开(公告)日：2015-11-24

    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.

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