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公开(公告)号：DE60024373D1
公开(公告)日：2006-01-05
申请号：DE60024373
申请日：2000-08-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMEL RAAFAT EDWARD , KUO WEN-YI , WEAVER CARL FRANCIS , WU XIAO CHENG , MEYERS MARTIN HOWARD
Abstract: A base station assembles a frame including information bits at a vocoding rate for downlink transmission over a traffic channel as channel bits at a channel rate. The base station places at least one rate-indicating bit at a beginning of the frame for indicating the vocoding rate. The mobile station evaluates the downlink transmission with consideration of the vocoding rate indicated by the at least one rate-indicating bit. The mobile station can determine the vocoding rate by decoding the beginning of the frame to permit power control in less than one frame duration from initial receipt of the frame at the mobile station.
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22.发明专利
公开(公告)号：CA2317517A1
公开(公告)日：2001-03-15
申请号：CA2317517
申请日：2000-09-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMEL RAAFAT EDWARD , WEAVER CARL FRANCIS , WU XIAO CHENG , MEYERS MARTIN HOWARD
Abstract: A base station (312, 314, 316, 612, 614, 616) in a soft handoff adjusts i ts transmit power level by a first amount if the base station (312, 314, 316, 612, 614, 616) is participating in a soft handoff and by a second amount if the base station (312, 314, 316, 612, 614, 616) is not participating in the soft handoff, i.e . in simplex mode. The first and second amounts are different. In one embodiment of the invention, the adjustment is performed by using a down-step size that is larger in magnitude than an up-step size when the base station (312, 314, 316, 612, 61 4, 616) is in soft handoff. The transmit power level is then adjusted by the smaller up and larger down step sizes when the base station (312, 314, 316, 612, 614, 616) receives an indication to adjust the transmit power level. The step sizes used when t he base station (312, 314, 316, 612, 614, 616) is in simplex mode is larger than the up-step size and smaller than the down step size. In another embodiment, when the ba se station (312, 314, 316, 612, 614, 616) is in soft handoff, the adjustment is performed by adjusting the transmit power level by the same step size as used during simplex mode when the base station (312, 314, 316, 612, 614, 616) receives an indication to adjust the transmit power level and then reducing the result by a reduction amount. The order of these two steps can be reversed, and the transmit power level c an be first reduced by the reduction amount and then adjusted by the same step siz es as used during simplex mode. The reduction amount has a magnitude greater than zero and smaller than the step size. The method of adjusting the base station transmit power level by different amounts based on whether the base station (312, 314 , 316, 612, 614, 616) participating in a soft handoff can be used with the method o f programming each base station (312, 314, 316, 612, 614, 616) in a soft hando ff with a threshold power level to constrain the power transmitted by the base stati on (312, 314, 316, 612, 614, 616) on the forward link. When the threshold power level is a minimum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or above the minimum-threshold power level. When the threshold power level is a maximum-threshold power level, each ba se station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or below the maximum-threshold power level. The threshold power level can be either a n adjustable or a fixed threshold power level.
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公开(公告)号：BR0002735A
公开(公告)日：2001-03-13
申请号：BR0002735
申请日：2000-07-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEAVER CARL FRANCIS , WU XIAO CHENG
Abstract: Base station in a soft handoff programmed to have a threshold power level to control the power transmitted by the base station on the forward link. When the threshold power level is a minimum-threshold power level, each base station maintains its transmit power level at or above the minimum-threshold power level. When the threshold power level is a maximum-threshold power level, each base station maintains its transmit power level at or below the maximum-threshold power level. Preferably, all power levels are expressed in decibels (dB) relative to the pilot's power level. The threshold power level can be adjustable or fixed. In the case where the threshold power level is fixed, each base station is programmed with the fixed threshold power level, and each base station decides how to adjust its transmit power level locally based on the fixed threshold power level without input from other base stations. In the case where the threshold power level is adjustable, the threshold power level is adjusted by a threshold step size responsive to the transmit power level being substantially equal to the threshold power level for at least a predetermined percentage of a time period. There are two alternatives on how each base station decides how to adjust its transmit power level. In one alternative, each base station participating in a soft handoff sends its power control information to a processor which adjusts the threshold power level and notifies each base station of the new adjusted threshold power level. In the meantime, each base station uses its current threshold power level to locally adjust its transmit power level. In the other alternative, each base station adjusts the threshold power level locally without input from other base stations, and uses the threshold power level to adjust its transmit power level.
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公开(公告)号：CA2313555A1
公开(公告)日：2001-01-16
申请号：CA2313555
申请日：2000-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WU XIAO CHENG , WEAVER CARL FRANCIS
Abstract: Base station in a soft handoff programmed to have a threshold power level to control the power transmitted by the base station on the forward link. When the threshold power level is a minimum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or above the minimum-threshold power level. When the threshold power level is a maximum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or below the maximum- threshold power level. Preferably, all power levels are expressed in decibels (dB) relative to the pilot's power level. The threshold power level can be adjustable or fixed. In the case whe re the threshold power level is fixed, each base station is programmed with the fixed thresho ld power level, and each base station decides how to adjust its transmit power level locally bas ed on the fixed threshold power level without input from other base stations. In the case where the threshold power level is adjustable, the threshold power level is adjusted by a threshold step size responsive to the transmit power level being substantially equal to the threshold power level for at least a predetermined percentage of a time period. There are two alternatives on how each base station decides how to adjust its transmit power level. In one alternative, each base station (312, 314, 316) participating in a soft handoff sends its power control information to a processor (328) which adjusts the threshold power level and notifies each ba se station of the new adjusted threshold power level. In the meantime, each base station uses its current threshold power level to locally adjust its transmit power level. In the oth er alternative, each base station (612, 614, 616) adjusts the threshold power level locally witho ut input from other base stations, and uses the threshold power level to adjust its transmit pow er level.
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公开(公告)号：BR9905824A
公开(公告)日：2000-08-08
申请号：BR9905824
申请日：1999-12-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUO WEN-YI , MEYERS MARTIN HOWARD , WU XIAO CHENG
Abstract: The present invention is a method for efficiently utilizing spectrum resources belonging to a wireless communications system in the presence of data channels through a discontinuous data transmission technique. The discontinuous data transmission technique involves the transmission of a flag over a control channel (or some other communication channel) in frame f, wherein the flag would indicate to an intended recipient that a transmitter has a data frame to transmit to the recipient in some future frame f+q. In an embodiment, the transmitter would subsequently transmit the data frame over a data channel (or some other communication channel) in frame f+q if the flag indicated that the data frame was ready to be transmitted. In another embodiment, the transmitter would not transmit the data frame unless the recipient has indicated (via another flag) that the recipient is ready to receive the frame of data from the transmitter.
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Patent Agency Ranking
公开(公告)号：AU5830599A
公开(公告)日：2000-05-18
申请号：AU5830599
申请日：1999-11-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MEYERS MARTIN HOWARD , NALLEPILI S RAMESH , WANG JIAN-REN , WU XIAO CHENG
Abstract: Disclosed is a method for significantly reducing the amount of collisions of access messages on reverse link Random Access Channels (RACH) by multiple mobile-stations attempting to gain system access concurrently, thereby greatly improving access performance in wireless communications system using existing multiple access schemes. The improvement is achieved by transmitting a probe message instead of an access message over the RACH, wherein the probe message is shorter in length than the access message. Transmission of the probe messages utilizes less of the RACH than the longer access messages, thereby reducing the chance of collisions with other probe messages. The access message is subsequently sent on a traffic channel or a control channel designated by a base station receiving the probe message. Alternately, a data burst is transmitted over the designated traffic channel or control channel.
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公开(公告)号：DE69938281D1
公开(公告)日：2008-04-17
申请号：DE69938281
申请日：1999-08-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BERNSTEIN NEIL E , WU XIAO CHENG
Abstract: A method and system that minimizes pilot signal overlap and radio frequency ("RF") interference by estimating changes in pilot coverage for different traffic channel loading and power conditions. Once base stations are positioned, a terminal for measuring received pilot signal strengths, such as a mobile station or pilot scanner, is used to collect and generate the baseline pilot survey data, which is then stored on a disk or tape. Base station transmit pilot EC/IOs, i.e., traffic channel loads on forward links, are also stored on disk or tape. The invention uses two adjustment factors associated with transmit power and traffic channel loading to optimize for different RF conditions, specifically for different base station transmit power or forward link loading conditions. For each RF condition, the methodology calculates the changes in the baseline pilot survey data. This reflects what EC/IOs a mobile station would receive under the given conditions. The systems engineer collects a set of optimized base station power settings for each of the different traffic channel load conditions. One of these optimized power settings is then selected by the systems engineer for each of the base stations.
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公开(公告)号：DE60020471T2
公开(公告)日：2006-03-23
申请号：DE60020471
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMEL RAAFAT EDWARD , MEYERS MARTIN HOWARD , WEAVER CARL FRANCIS , WU XIAO CHENG
Abstract: A base station (312, 314, 316, 612, 614, 616) in a soft handoff adjusts its transmit power level by a first amount if the base station (312, 314, 316, 612, 614, 616) is participating in a soft handoff and by a second amount if the base station (312, 314, 316, 612, 614, 616) is not participating in the soft handoff, i.e. in simplex mode. The first and second amounts are different. In one embodiment of the invention, the adjustment is performed by using a down-step size that is larger in magnitude than an up-step size when the base station (312, 314, 316, 612, 614, 616) is in soft handoff. The transmit power level is then adjusted by the smaller up and larger down step sizes when the base station (312, 314, 316, 612, 614, 616) receives an indication to adjust the transmit power level. The step sizes used when the base station (312, 314, 316, 612, 614, 616) is in simplex mode is larger than the up-step size and smaller than the down step size. In another embodiment, when the base station (312, 314, 316, 612, 614, 616) is in soft handoff, the adjustment is performed by adjusting the transmit power level by the same step size as used during simplex mode when the base station (312, 314, 316, 612, 614, 616) receives an indication to adjust the transmit power level and then reducing the result by a reduction amount. The order of these two steps can be reversed, and the transmit power level can be first reduced by the reduction amount and then adjusted by the same step sizes as used during simplex mode. The reduction amount has a magnitude greater than zero and smaller than the step size. The method of adjusting the base station transmit power level by different amounts based on whether the base station (312, 314, 316, 612, 614, 616) participating in a soft handoff can be used with the method of programming each base station (312, 314, 316, 612, 614, 616) in a soft handoff with a threshold power level to constrain the power transmitted by the base station (312, 314, 316, 612, 614, 616) on the forward link. When the threshold power level is a minimum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or above the minimum-threshold power level. When the threshold power level is a maximum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or below the maximum-threshold power level. The threshold power level can be either an adjustable or a fixed threshold power level.
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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
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.
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公开(公告)号：CA2315957A1
公开(公告)日：2001-02-26
申请号：CA2315957
申请日：2000-08-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WU XIAO CHENG , WEAVER CARL FRANCIS , KUO WEN-YI , MEYERS MARTIN HOWARD , KAMEL RAAFAT EDWARD
Abstract: A base station assembles a frame including information bits at a vocoding rate for downlink transmission over a traffic channel as channel bits at a channel rate. The base station places at least one rate-indicating bit at a beginning of the frame for indicating the vocoding rate. The mobile station evaluates the downlink transmission with consideration of the vocoding rate indicated by the at least one rate-indicating bit. The mobile station can determine the vocoding rate by decoding the beginning of the frame to permit power control in less than one frame duration from initial receipt of the frame at the mobile station.
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