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公开(公告)号：AU4716800A
公开(公告)日：2001-01-18
申请号：AU4716800
申请日：2000-07-12
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：AU3795100A
公开(公告)日：2000-12-14
申请号：AU3795100
申请日：2000-06-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , LI QUINN , WU XIAO CHENG
Abstract: In a wireless communications system, a base station transmits power control signals (e.g., the power control bits of a power control sub-channel) to a mobile using a forward-link channel that is decoupled from all other signals transmitted from that base station to that mobile. For example, the decoupled forward-link channel may be a common power control channel. The mobile then uses the power control signals received in the decoupled forward-link channel to control its power level for transmitting one or more reverse-link channels to the base station. The ability of base stations to use decoupled forward-link channels in order to transmit their power control signals to a mobile enables a mobile to operate with different active sets for the forward and reverse links. This enables forward-link data traffic to be implemented using a simplex mode, even when the mobile is operating in soft handoff in the reverse link. This in turn greatly reduces the reactivation time involved in transitioning a mobile from the suspended state to the active state, which is particularly desirable for bursty (i.e., intermittent) packet data flow, as opposed to continuous circuit-oriented voice messaging.
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公开(公告)号：CA2310428A1
公开(公告)日：2000-12-11
申请号：CA2310428
申请日：2000-06-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI QUINN , WU XIAO CHENG , KUMAR SARATH
Abstract: In a wireless communications system, a base station transmits power control signals (e.g., the power control bits of a power control sub-channel) to a mobile using a forward-link channel that is decoupled from all other signals transmitted from that base station to that mobile. For example, the decoupled forward-link channel may be a common power control channel. The mobile then uses the power control signals received in the decoupled forwardlink channel to control its power level for transmitting one or more reverse-link channels to the base station. The ability of base stations to use decoupled forward-link channels in order to transmit their power control signals to a mobile enables a mobile to operate with different active sets for the forward and reverse links. This enables forward-link data traffic to be implemented using a simplex mode, even when the mobile is operating in soft handoff in the reverse link. This in turn greatly reduces the reactivation time involved in transitioning a mobile from the suspended state to the active state, which is particularly desirable for bursty (i.e., intermittent) packet data flow, as opposed to continuous circuit-oriented voice messaging.
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公开(公告)号：CA2289361A1
公开(公告)日：2000-06-18
申请号：CA2289361
申请日：1999-11-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MEYERS MARTIN HOWARD , WU XIAO CHENG , KUO WEN-YI
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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公开(公告)号：AU4586499A
公开(公告)日：2000-03-16
申请号：AU4586499
申请日：1999-09-01
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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Patent Agency Ranking
公开(公告)号：DE69934731T2
公开(公告)日：2007-10-11
申请号：DE69934731
申请日：1999-03-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BERNSTEIN NEIL E , KUO WEN YI , MEYERS MARTIN HOWARD , WANG XIAO , WEAVER CARL FRANCIS , WU XIAO CHENG
IPC: H04W36/14
Abstract: Inter-frequency handoffs in a CDMA or other wireless communication system are controlled using a noise-limited coverage trigger metric which is able to distinguish between same-frequency cell boundaries and other-frequency cell boundaries in the system. The trigger metric may be generated as a function of an average signal-to-noise measure for pilot signals received at a mobile station of the system and a linear sum of the signal-to-noise measures. The signal-to-noise measures may be generated in the mobile station and included in messages transmitted from the mobile station to one or more base stations of the system. The trigger metric is used to control a handoff from a current frequency to a new frequency in an ongoing call. The trigger metric may alternatively be based on a measure of mobile receive power alone. Other aspects of the invention reduce unnecessary searching for a new frequency and decrease the likelihood of "ping-ponging" from a current frequency to a new frequency by providing additional checks in the handoff process. For example, receive power and pilot signal-to-noise measures may be generated at a mobile station for both current and new frequencies. The mobile station then continues to operate at the current frequency as long as certain predetermined threshold conditions based on the measures are satisfied.
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公开(公告)号：DE69934731D1
公开(公告)日：2007-02-22
申请号：DE69934731
申请日：1999-03-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BERNSTEIN NEIL E , KUO WEN YI , MEYERS MARTIN HOWARD , WANG XIAO , WEAVER CARL FRANCIS , WU XIAO CHENG
IPC: H04W36/14
Abstract: Inter-frequency handoffs in a CDMA or other wireless communication system are controlled using a noise-limited coverage trigger metric which is able to distinguish between same-frequency cell boundaries and other-frequency cell boundaries in the system. The trigger metric may be generated as a function of an average signal-to-noise measure for pilot signals received at a mobile station of the system and a linear sum of the signal-to-noise measures. The signal-to-noise measures may be generated in the mobile station and included in messages transmitted from the mobile station to one or more base stations of the system. The trigger metric is used to control a handoff from a current frequency to a new frequency in an ongoing call. The trigger metric may alternatively be based on a measure of mobile receive power alone. Other aspects of the invention reduce unnecessary searching for a new frequency and decrease the likelihood of "ping-ponging" from a current frequency to a new frequency by providing additional checks in the handoff process. For example, receive power and pilot signal-to-noise measures may be generated at a mobile station for both current and new frequencies. The mobile station then continues to operate at the current frequency as long as certain predetermined threshold conditions based on the measures are satisfied.
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公开(公告)号：AT311702T
公开(公告)日：2005-12-15
申请号：AT00306927
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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公开(公告)号：DE60020471D1
公开(公告)日：2005-07-07
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：DE69923927D1
公开(公告)日：2005-04-07
申请号：DE69923927
申请日：1999-12-07
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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