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公开(公告)号：CA2317142A1
公开(公告)日：2001-03-02
申请号：CA2317142
申请日：2000-08-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEAVER CARL FRANCIS , WU XIAO CHENG , MEYERS MARTIN HOWARD , KAMEL RAAFAT EDWARD , KUO WEN-YI
IPC: H04B1/04 , H04B7/005 , H04B7/26 , H04W52/12 , H04W52/14 , H04W52/40 , H04W52/50 , H04Q7/36 , H04Q7/38
Abstract: A method and system for controlling downlink transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce fading. For a soft hand-off, a mobile switching center determines if a forward control channel is transmitted from different sectors of base stations than a forward data channel is. The base stations preferably adjust transmit powers of the forward channels grouped into different physical channels by receiving power control data over the allocated reverse power control channels to compensate for fading of the forward channels during a soft hand-off.
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公开(公告)号：CA2313554A1
公开(公告)日：2001-01-19
申请号：CA2313554
申请日：2000-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： THOMAS MATHEW , WEAVER CARL FRANCIS , GANDHI ASIF DAWOODI , EIBLING EDWARD ELLIS , KUO WEN-YI
Abstract: A method that initiates call blocking responsive to a call-quality measureme nt of the forward link. The call-quality measurement is a measurement of how well a mobile terminal is able to receive the forward link. One call-quality measurement is a pilot fraction of the forward link, which is a ratio of the pilot's power level to the power level of a se t of forward-link signals of a base station. Call blocking is initiated when an average pilot fraction is below a pilot-fraction blocking threshold. The pilot's power level is obtained for a time period, a nd the signal set's power level is obtained for the same time period. The pilot fraction i s determined for the time period, and then used to determine the average pilot fraction for the time period. The average pilot fraction for the current time period is based on a pilot fraction for the current time period, and an average pilot fraction for a previous time period. When the average pilot fraction is below the pilot-fraction blocking threshold, call blocking is initiated. The pilot-fraction blocking threshold is preferably based on: 1) the pilot fraction when the ba se station is at full load; 2) the size, shape, and terrain of the cell; and 3) the aggressiveness of the overload control. In the preferred embodiment, the signal set includes allof the signals generated by the base station, alternatively, the signal set can include fewer than all the signal s generated by the base station. If the cell includes several sectors, the call blocking is initiate d on a sector basis when the average pilot fraction of the sector is below the pilot-fraction blockin g threshold. Other call-quality measurements, such as the forward link's frame error rate, the number of dropped calls, or the Power Measurement Report Message (PMRM), can be used, alone or in combination, instead of or in addition to the pilot fraction of the forward link to determine whether call blocking should be initiated. Determining whether call blocking should be initiated using one of the other call-quality measurements is performed in a similar manner as for the pilot fraction. Initiating call blocking using several call-quality measurements involves initiating call blocking when any one of the call-quality measurements indicates that call blocking should be initiated. Alternatively, call blocking can be initiated when several of the call quali ty measurements indicate that call blocking should be initiated.
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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：AU4874099A
公开(公告)日：2000-03-23
申请号：AU4874099
申请日：1999-09-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KAMEL RAAFAT EDWARD , KAO 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 Ec/Io and the mobile unit received pilot Ec/Io. 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 Ec/Io 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：CA2264471A1
公开(公告)日：1999-09-30
申请号：CA2264471
申请日：1999-03-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUO WEN-YI , WEAVER CARL FRANCIS , MEYERS MARTIN HOWARD
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.
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Patent Agency Ranking
公开(公告)号：DE60024373T2
公开(公告)日：2006-07-13
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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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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公开(公告)号：DE69928347D1
公开(公告)日：2005-12-22
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：DE60102770T2
公开(公告)日：2005-03-31
申请号：DE60102770
申请日：2001-08-28
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GANDHI ASIF D , KAMEL RAAFAT E , KOSTIC ANDREW R , SALVARANI ALEXANDRO , THOMAS MATHEW , VITEBSKY STANLEY , WEAVER CARL FRANCIS
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公开(公告)号：DE69903210T2
公开(公告)日：2003-07-10
申请号：DE69903210
申请日：1999-01-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BAUM MODRIS OLGERTS ALLEN , PITTAMPALLI ESHWAR , WEAVER CARL FRANCIS
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