公开(公告)号：CA2327071A1

公开(公告)日：2001-06-28

申请号：CA2327071

申请日：2000-11-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  LUBACHEVSKY BORIS DMITRIEVICH ,  GRANDHI SUDHEER A ,  BORST SIMON C ,  WHITING PHILIP ALFRED

IPC: H01Q3/38 ,  H04B7/08 ,  H04B7/10 ,  H04W16/10 ,  H04W16/28 ,  H04Q7/36

Abstract: Disclosed is a method for improving call quality and capacity by integrating a dynamic channel allocation technique into an intelligent antenna system. The intelligent antenna systems includes beams which are grouped into sets, wherein each set has associated a long list and a primary short list, and each beam has associated a secondary short lis t. In one embodiment, long term interference levels are measured on each beam in a set of beams fo r a plurality of communication channels to produce the long list; short term interference levels are measured on each beam in the set of beams for a portion of the plurality of communicatio n channels to produce a plurality of secondary short lists and the primary short list; and communication channels are assigned to a mobile-station from the portion of the plurality of communication channels based on the measured short term interference levels on each beam i n the set of beams. The long list and the primary short list are based upon highest measured lon g and short term interference levels, respectively, for each of the plurality of communicatio n channels across each beam in the set of beams.

公开(公告)号：AU4449499A

公开(公告)日：2000-03-09

申请号：AU4449499

申请日：1999-08-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  WEAVER CARL F ,  LIN SHEN-DE ,  KOO YUEN-YIN ,  HUANG CHING YAO

IPC: H04B7/26 ,  H04W36/14 ,  H04Q7/30 ,  H04Q7/38 ,  H04B1/69

Abstract: A procedure for triggering a handdown or a handoff a mobile station served by a base station of a cellular wireless communication system. A tolerable path loss for signal links between the base station and a mobile station located within the base station's cell, is initially determined. A control signal is radiated at a known transmit power level from the base station over its cell. A receive power level threshold is determined for the control signal for reception by the mobile station, according to the transmit power level and the tolerable path loss. A handoff of the mobile station is triggered after deriving the received power level of the control signal at the mobile station, and determining that the received power level is less than the receive power level threshold. In one embodiment, a mobile station reports to a serving base station only after the former determines that the received power level of a control signal from the base station is less than a threshold level initially provided to the mobile station by the base station. The procedure is applicable, e.g., to base station cells of a first CDMA cellular system which cells border on cells of an analog (AMPS) or a second CDMA cellular system.

公开(公告)号：AU4343799A

公开(公告)日：2000-03-02

申请号：AU4343799

申请日：1999-08-06

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  HUANG CHING YAO

IPC: H04B7/26 ,  H04W36/18 ,  H04W36/38 ,  H04Q7/30

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.

公开(公告)号：BR9900003A

公开(公告)日：1999-12-28

申请号：BR9900003

申请日：1999-01-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  GANDHI ASIF DAWOODI

IPC: H04B7/26 ,  H04B17/00 ,  H04Q7/36

Abstract: Link performance is measured in a code division multiple access (CDMA) personal communication service (PCS) or cellular system, or other type of wireless system, using a test set-up (30) which permits the simulation of various changes in system configuration. An illustrative embodiment includes a first attenuator (36) arranged in a common portion of a receive path and a transmit path of a mobile station (32) of the system, and a second attenuator (40) arranged in either a receive-only portion of the receive path or a transmit-only portion of the transmit path. The amounts of attenuation provided by the first and second attenuators are decoupled such that a different amount of attenuation can be provided on the transmit path than on the receive path. Performance of forward and reverse links of the system are measured while varying a value of at least one of the first or second attenuators. For a given measurement, the attenuator values may be selected to simulate performance of the system in a configuration in which base station amplifier power is increased or decreased. As another example, the attenuator values may be selected to simulate performance of the system in a configuration in which cell size is increased. This arrangement of decoupled forward and reverse link attenuation in accordance with the invention permits efficient and accurate determination of link balance conditions.

公开(公告)号：DE60136657D1

公开(公告)日：2009-01-02

申请号：DE60136657

申请日：2001-06-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  JIANG FRANCES ,  VITEBESKY STANLEY

IPC: H04L1/00 ,  H04W28/22

Abstract: A method for determining the reverse link data Rate Limit for mobile stations active on the reverse link of a High Data Rate system is disclosed. In the ideal case, the Rate Limit is based on only the number of mobile stations located in a common sector that are actually active on the reverse link. Currently, the Rate Limit is determined from the total number of mobile stations in a common sector where the total includes mobiles that are transmitting and receiving. Thus, the current method includes mobile stations that are active on the forward link and may not be active on the reverse link. In this invention, a more optimum method of estimating the reverse link loading is obtained from calculations which includes only the mobile stations which are active on the reverse link. An estimate of the reverse link loading of the mobile stations in a common cell is obtained by adding together the data rates of the data sent from each mobile in a common sector during a common frame. This aggregate rate of data during the frame is filtered to minimize irregularities by using the moving average of an infinite impulse response filter and then normalized. The normalized result is a percentage of the maximum achievable aggregate reverse link rate. The final result is compared with a set of threshold values to obtain the maximum Rate Limit that is then set for each mobile station.

公开(公告)号：DE60120331D1

公开(公告)日：2006-07-20

申请号：DE60120331

申请日：2001-06-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  JIANG FRANCES ,  VITEBSKY STANLEY

IPC: H04L1/00 ,  H04W28/22

Abstract: A method for determining the reverse link data Rate Limit for mobile stations active on the reverse link of a High Data Rate system is disclosed. In the ideal case, the Rate Limit is based on only the number of mobile stations located in a common sector that are actually active on the reverse link. Currently, the Rate Limit is determined from the total number of mobile stations in a common sector where the total includes mobiles that are transmitting and receiving. Thus, the current method includes mobile stations that are active on the forward link and may not be active on the reverse link. In this invention, a more optimum method of estimating the reverse link loading is obtained from calculations which includes only the mobile stations which are active on the reverse link. An estimate of the reverse link loading of the mobile stations in a common cell is obtained by adding together the data rates of the data sent from each mobile in a common sector during a common frame. This aggregate rate of data during the frame is filtered to minimize irregularities by using the moving average of an infinite impulse response filter and then normalized. The normalized result is a percentage of the maximum achievable aggregate reverse link rate. The final result is compared with a set of threshold values to obtain the maximum Rate Limit that is then set for each mobile station.

公开(公告)号：CA2329265C

公开(公告)日：2006-04-11

申请号：CA2329265

申请日：2000-12-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  HUANG JOE ,  MURPHY KEVIN JOHN ,  MISRA APARAJITA

IPC: H04B7/005 ,  H04L1/00 ,  H04B1/04 ,  H04B7/26 ,  H04J3/00 ,  H04J3/02 ,  H04W52/20 ,  H04W52/24 ,  H04W52/36

Abstract: A method for controlling downlink power in a time-division multiplex wirele ss system may provide different downlink transmit signal powers to different time-division multiplex channels of a single carrier. A base station receive s a measured signal parameter data for a downlink transmit signal of a time- division multiplex channel. The base station determines an initial adjustment for the downlink transmit signal power of the time division multiplex channel if the measured signal parameter data differs from a target signal parameter data. The base station determines a revised adjustment for the downlink transmit power of the time division multiplex channel based on the initial adjustment and at least one adjustment range as appropriate to achieve synchronization of the demodulation of the downlink transmit signal.

公开(公告)号：CA2315488C

公开(公告)日：2004-07-06

申请号：CA2315488

申请日：2000-08-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  GRANDHI SUDHEER A

IPC: H04B7/26 ,  H04W4/06 ,  H04W4/12 ,  H04B7/216

Abstract: A computer implemented method and apparatus that schedules broadcast short message service (BSMS) messages in a manner that reduces the adverse impact on voice quality and system capacity, attributable to the transmission of the BSMS messages, in a wireless telecommunications system. The method and apparatus utilize a quality of service (QoS) based broadcast message scheduler to negotiate and schedule the transmission times of BSMS messages to the individual users in the syste m. The quality of service (QoS) based broadcast message scheduler also allows a use r to tradeoff voice quality for broadcast capacity.

公开(公告)号：DE69909571D1

公开(公告)日：2003-08-21

申请号：DE69909571

申请日：1999-09-21

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  HUANG CHING YAO

IPC: H04B1/04 ,  H04B7/005 ,  H04B7/26

Abstract: A code-division multiple access power control for paging channel power and initial traffic channel power dynamically determines optimum initial channel power in accordance with pilot signal strength of a pilot signal as received at a mobile station and current forward link loading of the desired sector. The optimum initial paging channel power and initial traffic channel power may be determined either at a base station or a mobile switching center of the mobile communication system. A paging signal or call is transmitted from the base station to the mobile station over a paging channel and a traffic channel at the optimum paging channel and initial traffic channel power.

公开(公告)号：AU1368901A

公开(公告)日：2001-07-26

申请号：AU1368901

申请日：2001-01-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHENG TERRY SI-FONG ,  HUANG JOE ,  MISRA APARAJITA ,  MURPHY KEVIN JOHN

IPC: H04L1/00 ,  H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04J3/00 ,  H04W52/20 ,  H04W52/24 ,  H04W52/36 ,  H04Q11/04