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    51.
    发明专利
    未知

    公开(公告)号：DE60100882T2

    公开(公告)日：2004-09-02

    申请号：DE60100882

    申请日：2001-07-10

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SALVARANI ALEXANDRO ,  WEAVER CARL FRANCIS

    IPC: H04B7/005 ,  H04W36/20 ,  H04W52/40 ,  H04Q7/38

    Abstract: A method/apparatus identifies other cell interference in a wireless network and determines whether a handoff to an affected base station should occur. In one implementation, a base station of a CDMA-based wireless network continuously monitors reverse link interference levels to detect an increased interference condition, and initiates a CDMA mobile identifying sequence to determine whether the interfering signal source is a proximate mobile being served by a neighboring base station of the network. The affected base station obtains a list of long code masks for mobiles being served by neighboring base stations, and instructs at least one receiver unit to sequentially despread received signals using each of the listed long code masks. When the receiver unit detects a signal transmitted by a non-served mobile, the base station analyzes relative reverse link signal strength for the non-served mobile, e.g., using Ec/Io measurements, to determine whether the non-served mobile is likely be the source of interference. Having determined that a nearby CDMA mobile is the source of interference, the affected base station may initiate one of a number of possible actions, including triggering a handoff to the affected base station so that the affected base station could control the transmit power level of the mobile, requesting that the interfering mobile be switched to a different frequency carrier or dropped, or merely recording the interference condition.

    FEEDBACK CONTROL SYSTEM FOR TELECOMMUNICATIONS SYSTEMS
    54.
    发明专利
    FEEDBACK CONTROL SYSTEM FOR TELECOMMUNICATIONS SYSTEMS 未知

    公开(公告)号：CA2237826C

    公开(公告)日：2002-12-10

    申请号：CA2237826

    申请日：1998-05-19

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： WEAVER CARL FRANCIS ,  MEYERS MARTIN HOWARD ,  TARRAF AHMED A

    IPC: H04L69/40 ,  G10L15/02 ,  H04B3/46 ,  H04B7/005 ,  H04B17/00 ,  H04M3/22

    Abstract: Telecommunications processing is applied to a reference signal to generate a signal under test. A fidelity measure is generated characterizing the fidelity of t he signal under test relative to the reference signal. A control signal is generated from the fid elity measure, where the control signal is used as a feedback signal to adjust the telecomm unications processing. In one embodiment, the reference signal is a speech signal and t he signal under test is a decoded speech signal generated by encoding, transmitting, and dec oding the reference speech signal. The fidelity signal is an average mean opinion scor e (MOS) and the control signal is used to control the speech decoding processing. For exampl e, the speech decoding processing may involve a speech decoder followed by a post filter, and the control signal is the cut-off frequency of the post filter. Such an embodiment may b e applied to real-time speech processing to adjust the speech decoding processing in the receiver of a telecommunications system that includes a speech encoder in a transmitter an d a communications network. Intermittently, the transmitter encodes reference si gnals that are also known to the receiver. The receiver performs the processing of the pres ent invention to update its speech decoding processing to optimize speech quality.

    ADAPTIVE ANTENNA SYSTEM AND METHOD
    55.
    发明专利
    ADAPTIVE ANTENNA SYSTEM AND METHOD 未知

    公开(公告)号：CA2351817A1

    公开(公告)日：2002-02-09

    申请号：CA2351817

    申请日：2001-06-28

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： WU XIAO CHENG ,  WEAVER CARL FRANCIS

    IPC: H01Q1/24 ,  H01Q3/26 ,  H01Q21/20 ,  H01Q25/00 ,  H04B7/26 ,  H04Q7/20 ,  H04B7/00 ,  H01Q21/00

    Abstract: A system and method have been developed wherein a cylindrical antenna array is configured and reconfigured in a wireless communication network. Position and signal information are continuously received from wireless mobi le units and are used to determine reconfigurations of antenna components of th e cylindrical antenna array to enhance performance of the system. As such, bas e station antennas are dynamically configured to minimize such things as interference and dropped calls, and to maximize their voice quality both within a cell, and among neighboring cells.

    56.
    发明专利
    未知

    公开(公告)号：BR9916552A

    公开(公告)日：2001-10-02

    申请号：BR9916552

    申请日：1999-03-22

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： KUO WEN-YI ,  MEYERS MARTIN HOWARD ,  WEAVER CARL FRANCIS

    IPC: H04B7/12 ,  H04W36/30 ,  H04Q7/38

    Abstract: An apparatus and method which, in a wireless communication system, improve the quality of inter-frequency hand-offs from an existing call connection frequency to a new frequency by minimizing oscillating inter-frequency hand-offs between the existing call connection frequency and the new frequency, and by minimizing redundant and unnecessary tuning and searching at the new frequency. The present invention accomplishes this improvement by adding specific threshold comparison values (or triggers) within existing messages and through more robust data reporting, from the mobile unit to the base station, when tuning and searching is performed. Particularly, two comparative triggers provided by the present invention avoid unnecessary tuning and searching in the new frequency, thus reducing voice degradation and the risk of dropped calls while pilot searching in the current frequency. Additionally, an alternative embodiment of the present invention compares received power in the new frequency to the received power in the original frequency. If the received power in the new frequency does not exceed the received power in the original frequency by a specified hysteresis threshold value, then a search of the new frequency is unnecessary and the mobile unit "retunes" to the original frequency.

    POWER CONTROL WITH EFFECTIVE EB/NO
    57.
    发明专利
    POWER CONTROL WITH EFFECTIVE EB/NO 未知

    公开(公告)号：CA2316722A1

    公开(公告)日：2001-03-07

    申请号：CA2316722

    申请日：2000-08-25

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： WEAVER CARL FRANCIS ,  NANDA SANJIV ,  REGE KIRAN M

    IPC: H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04Q7/36

    Abstract: A method and apparatus to quickly adjust a targeted E b/N0 (270, 470) in a wireless communication system by using an effective E b/N0 (310, 510) for each frame. The E b/N0 distribution of a frame produces a certain frame error rate. Effective E b/N 0 (310, 510) is the E b/N0 that would produce the same frame error rate in a model channel, such as an additive white Gaussian noise (AWGN) channel. The effective E b/N0 (310, 510) for eac h frame is obtained and compared to a model targeted E b/N0 (250, 480). The E b/N0 for all of the power control groups in one frame compose the vector E b/N0 (300, 500). The effective E b/N0 (310, 510) for the frame is obtained by mapping a vector E b/N0 (300, 500) into a scalar. The model targeted E b/N0 (280, 480) is the E b/N0 value that produces a desired frame error rate in the model channel. The targeted E b/N0 (270, 280) is increased by one up step si ze when the effective E b/N0 (310, 510) is smaller than the model targeted E b/N0 (280, 480) and i s decreased by one down step size when the effective E b/N0 (310, 510) is larger than the model targeted E b/N0 (280, 480). E b/N0 (290, 490) are measured for each power control group in a frame . The wireless communication system includes a transmitter (400) to transmit a signal, a receiver (320) to receive the signal, and an outer control loop (250, 450) to adjust the targeted E b/N0 (270, 470) based on a comparison of the effective E b/N0 (310, 510) of the signal to th e model targeted E b/N0 (280, 480). Preferably, the outer control loop (250, 450) is implemented in software, although it can be implemented in hardware. Obtaining an effective E b/N0 (310, 510) for each time period allows quicker adjustments of the targeted E b/N0 (270, 470). Th is permits the targeted E b/N0 (270, 470) to be closer to an E b/N0 that produces a desired frame error rate, especially if the mobile is moving. This allows the transmitted power to be closer to the power needed to produce the desired frame error rate, permitting an increase in th e capacity of the wireless communication system while still maintaining an acceptable number o f errors.

    Open loop power control for wireless mobile stations
    59.
    发明专利
    Open loop power control for wireless mobile stations 未知

    公开(公告)号：AU1252300A

    公开(公告)日：2000-08-03

    申请号：AU1252300

    申请日：2000-01-20

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： KOO YUEN-YIN L ,  WEAVER CARL FRANCIS ,  MEYERS MARTIN HOWARD ,  KUO WEN-YI

    IPC: H04B1/7075 ,  H04B1/7097 ,  H04B7/005 ,  H04B7/26 ,  H04Q7/32 ,  H04Q7/22

    Abstract: The present invention is an apparatus and method for calculating the transmit power of a mobile station by including an interference correction term in every access probe of the mobile station to more correctly estimate the path loss. The interference correction term accounts for the presence of base station pilot signals when calculating the transmit power. Importantly, the present invention is implementable in any CDMA based communication system. In an exemplary embodiment of the present invention, a mobile station implements open loop power control by determining an interference correction term that accounts for the detection of non-active-set pilot signals, thermal noise, or non-CDMA interference, one or more of which are indicated by the detection of a given receive threshold. The mobile station then adjusts its open loop transmit power (access probe power in access state) based on the interference correction term. In a further embodiment, the interference correction term is limited to a maximum level of correction for the case when an active pilot is not detected. In an additional embodiment, the non-active-set pilot power is approximated to all received pilots other than the largest active-set pilot.

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