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1.发明专利
公开(公告)号：JP2006319997A
公开(公告)日：2006-11-24
申请号：JP2006157032
申请日：2006-06-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONT , HUANG CHING YAO , KOO YUEN-YIN , SHEN-DE-LIN , WEAVER CARL F
Abstract: PROBLEM TO BE SOLVED: To provide a procedure for a handdown or a handoff of a mobile station moving between adjacent cells of a wireless communication system, in particular, a procedure of a handdown and a handoff to be triggered based on a loss of a propagation path between a mobile station and a base station serving that mobile station at present. SOLUTION: The disclosed method comprises steps of: radiating a control signal at a known transmit power level from a base station over its cell; determining a receive power level threshold for the control signal to a mobile station, according to the transmit power level and a tolerable path loss for signal links between the base station and the mobile station; and triggering a handdown or a handoff after deriving the receive power level of the control signal at the mobile station, and determining that the receive power level is less than the receive power level threshold. COPYRIGHT: (C)2007,JPO&INPIT
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公开(公告)号：JP2001069549A
公开(公告)日：2001-03-16
申请号：JP2000213584
申请日：2000-07-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HUANG CHING YAO , HUANG JOE , WU I-FONG ANTONIO , WU XIAO CHENG , YU BEE YUN
Abstract: PROBLEM TO BE SOLVED: To reduce the call loss rate under a radio frequency(RF) environment that varies dynamically by selecting the specific value of an additional parameter according to a decided quality standard, so as to use 1st and additional handoff parameters in a soft handoff process. SOLUTION: A system 10 includes a mover (MS) 12 and base stations BS1-BS4. It is decided whether the parameter selection rule of a part 1 is started with respect to at least one of members included in an active set. When this rule is started to the member, this rule is started to all members of the active set. Thus, the specific value of an additional parameter is selected according to a decided quality standard, so that the 1st and additional handoff parameters are used in a soft handoff process.
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公开(公告)号：JP2002141864A
公开(公告)日：2002-05-17
申请号：JP2001243063
申请日：2001-08-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TERRY SHIIFON CHEN , HUANG CHING YAO , JIANG FRANCES , KUZYSZYN STEVE MYKOLA , YANG YANG
IPC: H04L29/08 , G10L19/012 , H04B7/26 , H04M3/00 , H04Q7/38
Abstract: PROBLEM TO BE SOLVED: To more efficiently use a communication link between elements in a communication system. SOLUTION: During a silent period, a message containing comfortable noises is not transmitted but a message instructing the generating of comfortable noises to the element is transmitted so that the communication link between the elements in the communication system can be more efficiently used. The message instructing the generation of comfortable noises to the element is smaller than the message containing comfortable noises. As a result, the message for generating comfortable noises or command is transmitted rather than the message containing comfortable noises so that the bandwidth of the link between communication system elements can be more efficiently used.
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公开(公告)号：JP2002026810A
公开(公告)日：2002-01-25
申请号：JP2001141359
申请日：2001-05-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONG , HUANG CHING YAO , JIANG FRANCES , SALVARINI ALEXANDRO
Abstract: PROBLEM TO BE SOLVED: To provide power control intensified by adaptively adjusting a quantity for varying a ratio of a target signal to noise. SOLUTION: In this method, a signal is received from a mobile station. The standard deviation of a symbol error rate is decided and power control with the adaptive shape adjustment of the variation of ratio of a target signal to noise is parried out based on the decided standard deviation of a signal error rate and a target related to it.
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5.发明专利
公开(公告)号：JP2000224650A
公开(公告)日：2000-08-11
申请号：JP2000012453
申请日：2000-01-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HUANG CHING YAO , JIANG FRANCES , KOO YUEN-YIN L
Abstract: PROBLEM TO BE SOLVED: To reduce a processing load of inter-carrier hand-off by a controller of a base station by selecting a radio frequency carrier for a subscriber on the basis of a load factor of a radio frequency related to each carrier and a prescribed threshold value to evaluate the load factor. SOLUTION: A sub-system 24 of a base station measures a 1st load level and a 2nd load level of a call transmission carrier covering a 1st geographical area and a transfer destination object carrier covering a 2nd graphical area. In the case of the 1st load level the 2nd load level and that a difference between the 1st and 2nd load levels is smaller than a prescribed threshold value, the call transmission carrier is selected, and when the difference between the load levels is smaller than a prescribed threshold value, the transfer destination object carrier is selected to permit hand-off between carriers.
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Patent Agency Ranking
公开(公告)号：JP2000115073A
公开(公告)日：2000-04-21
申请号：JP27808699
申请日：1999-09-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONG , HUANG CHING YAO
Abstract: PROBLEM TO BE SOLVED: To optimize paging channel power and initial traffic channel power in CDMA by transmitting a paging message to a mobile station by radio wave by optimum paging channel power which is decided through a paging channel. SOLUTION: The mobile station 10 generates a pilot signal measuring message(PSMM) identifying a strength, that is the power of a received pilot signal by locking in the strongest pilot signal. When the mobile station 10 is locked in the pilot signal from a base station 30, for example, PSMM is transmitted to the base station 30. The controller of the base station 30 decides optimum paging channel power and optimum initial traffic channel power, based on the reported pilot signal strength and a present forward link load in accordance with a software program which is stored in a memory. Therefore, the power budget of a system is efficiently allocated.
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公开(公告)号：JP2000092549A
公开(公告)日：2000-03-31
申请号：JP23016399
申请日：1999-08-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONT , HUANG CHING YAO , KOO YUEN-YIN , SHEN-DE-LIN , WEAVER CARL F
Abstract: PROBLEM TO BE SOLVED: To realize hand-down and hand-off procedures to be triggered based on the loss in a propagation route between a mobile station and a base station providing service at present. SOLUTION: This method triggers hand-down or hand-off of a mobile station serviced representatively by a base station in a cellular radio communication system. The method consists of a step for radiating a control signal from a base station on a cell by a known transmission power level, a step for determining a receiving power level threshold for the control signal to the mobile station in accordance with the transmission power level and a route loss allowable to a signal link between the base station and the mobile station and a step for calculating the receiving power level of the control signal in the mobile station, determining that the receiving power level is lower than the receiving power level threshold and triggering the hand-down or hand-off of the mobile station.
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公开(公告)号：ES2277412T3
公开(公告)日：2007-07-01
申请号：ES99306307
申请日：1999-08-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONT , HUANG CHING YAO , KOO YUEN-YIN , SHEN-DE-LIN , WEAVER CARL F
Abstract: Un método de recepción de las mediciones desde la estación móvil (16) hasta una estación de base (10) de un sistema de comunicación inalámbrica celular (12) que irradia una señal de control desde la estación de base y recibe una medición de la fuerza de la señal de control Ec/Io de dicha señal de control realizada en dicha estación móvil (16), dicha medición de la fuerza de la señal de control Ec/Io es una proporción de la potencia de la señal de control dividida entre la potencia total de la señal recibida, dicho método caracterizado por: recibir desde dicha estación móvil (16) una medición separada de la potencia total de la señal recibida que es realizada en dicha estación móvil (16) y separada de dicha medición de la fuerza de la señal de control.
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公开(公告)号：DE60026457T2
公开(公告)日：2006-09-14
申请号：DE60026457
申请日：2000-07-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HUANG CHING YAO , HUANG JOE , WU I-FONG ANTONIO , WU XIAO CHENG , YU BEE YUN
Abstract: Soft handoffs in an IS-95 CDMA system or other wireless communication system are controlled using an enhanced set of soft handoff parameters which allow the system to adapt more readily to changing radio frequency (RF) conditions. In an illustrative embodiment, values for particular ones of the soft handoff parameters are selected in accordance with a set of rules, including rules such as, e.g., select the minimum value of add threshold among the members of an active set of pilots for a given mobile station; select the maximum value of drop threshold among the members of the active set; select the minimum value of drop threshold timer among the members of the active set; and select the minimum value of comparison threshold among the members of the active set. A quality measure is then determined for each of the members of the active set, based on one or more of the selected soft handoff parameter values and values of one or more additional parameters, e.g., add intercept, drop intercept and slope parameters, associated with those members. Particular values of the additional parameters are then selected based on the quality measures. The selected parameter values are then utilized in a soft handoff process, e.g., in a soft handoff process in which the given mobile station is directed to handoff from a primary base station to another base station of the system.
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公开(公告)号：BR9903869A
公开(公告)日：2000-08-29
申请号：BR9903869
申请日：1999-07-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHENG TERRY SI-FONG , HUANG CHING YAO
Abstract: A code-division multiple access base station assisted quality soft handoff algorithm screens or filters out candidate pilot signals from a pilot strength measurement message generated by a mobile station and provides the revised pilot strength measurement message to the mobile switching center of the mobile communication system. The mobile switching center subsequently conducts handoff processing in accordance with the revised pilot strength measurement message. If the combined pilot signal strength of the existing mobile station active legs is less than a first threshold, the current pilot strength measurement message is maintained. If the combined pilot signal strength of the existing mobile station active legs is greater than or equal to the first threshold, all candidate pilot signals are deleted from the pilot strength measurement message such that only pilot signals of existing mobile station active legs remain. Also, if the pilot signal strength of a candidate pilot signal is greater than a second threshold, the candidate pilot signal is added to the pilot strength measurement message. The number of handoffs per call are reduced using the revised pilot strength measurement message such that forward link power and network processing resources are conserved.
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