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公开(公告)号：CA2279677A1
公开(公告)日：2000-03-21
申请号：CA2279677
申请日：1999-08-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMEL RAAFAT EDWARD , KUO WEN-YI , MEYERS MARTIN HOWARD , WEAVER CARL FRANCIS
Abstract: A method and apparatus that permits base stations to adaptively set initial power levels in forward link traffic channels (i.e., base station to mobile unit) based on an interference measure, where the interference measure is the difference between the base station transmitted pilot E c/I o and the mobile unit received pilot E c/I o. The interference measure indicates how much interference is present from other base stations in the mobile unit's locale, mobile receiver noise and other similar sources. Call quality and system capacity are optimized since the initial power level is set in accordance with the interference environment. The method of the invention implements the adaptive setting by extracting the mobile unit received pilot E c/I o from the access message transmitted by the mobile unit. The interference measure is then determined and used by the base station to set the initial power level in the forward link traffic channel.
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公开(公告)号：BR9901113A
公开(公告)日：2000-01-11
申请号：BR9901113
申请日：1999-03-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BERNSTEIN NEIL E , KUO WEN-YI , MEYERS MARTIN HOWARD , WANG XIAO , WEAVER CARL FRANCIS , WU XIAO CHENG
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：CA2254401A1
公开(公告)日：1999-06-15
申请号：CA2254401
申请日：1998-11-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUO WEN-YI , MEYERS MARTIN HOWARD , BI QI , WEAVER CARL FRANCIS , SANDERS CHARLES ALBERT
Abstract: A method for reducing multiple dominant pilots in a CDMA transmission system comprises linking a transceiver element with a nearby base station for transporting signals between the transceiver element and the nearby base station. Transmitting from the transceiver element forward link signals of a nearby sector associated with the nearby base station. An apparatus is also described.
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公开(公告)号：CA2237826A1
公开(公告)日：1998-12-25
申请号：CA2237826
申请日：1998-05-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEAVER CARL FRANCIS , TARRAF AHMED A , MEYERS MARTIN HOWARD
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.
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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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Patent Agency Ranking
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：DE69928347T2
公开(公告)日：2006-07-27
申请号：DE69928347
申请日：1999-09-21
Applicant: LUCENT TECHNOLOGIES INC
Abstract: A method and apparatus for arranging transmission of overhead messages on the paging channel of a wireless communications system is described. Certain paging channel slots are established, based on a timing reference, that must contain an overhead message. In the intervening slots or slot fragments, the base station transmits mobile-directed messages, when they are available. When no mobile directed messages are available for transmission, the base station selects an overhead message from a queue for transmission on the intervening paging channel slot or slot fragment.
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公开(公告)号：DE60017843T2
公开(公告)日：2006-05-18
申请号：DE60017843
申请日：2000-09-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： EIBLING EDWARD ELLIS , KAMEL RAAFAT EDWARD , KUO WEN-YI , THOMAS MATHEW , WEAVER CARL FRANCIS
Abstract: A method that adjusts the power level of a set of forward-link signals of a base station responsive to the loading of the forward link as determined by a power level measurement of the signal set. One power level measurement is a pilot fraction of the forward link. Other power level measurements, such as the signal set's power level, can be used, alone or in combination, instead of or in addition to the pilot fraction of the forward link to adjust the power level of the signal set. The power level of the signal set can be changed in any manner, including by scaling it by a scaling factor, or by increasing the power level by a fixed or a variable amount. The power level measurement of the signal set is obtained during a current time period. The scaling factor that will be used in the subsequent time period is determined using the power level measurement. In one embodiment of the invention, the scaling factor can be obtained from a look-up table that is based on the power level measurement. If the cell containing the base station includes several sectors, the power level of the signal set in a sector is adjusted when the power level measurement in that sector indicates that the power level should be adjusted.
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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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