Patents Examined by William Cumming
  • Patent number: 6496497
    Abstract: A method for managing walsh code channels in a mobile communication system includes the steps of initiating a plurality of walsh codes for the unit of sector and frequency at a base station, dividing the walsh codes allotted from the base station to a terminal in response to peak factor characteristic to put excellent walsh codes in a main queue and poor walsh codes in a sub queue, allotting with priority walsh codes which are on standby in the main queue at the base station if the terminal requests allocation of the walsh codes, and allotting walsh codes which are on standby in the sub queue if the allotted walsh codes are null or if there are no walsh codes having excellent peak factor characteristic. Accordingly, it is possible to minimize interference exerted on adjacent channels during communication, thereby improving quality of service in the overall communication system.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: December 17, 2002
    Assignee: LG Information & Communications, Ltd.
    Inventors: Jong Il Lee, Sang Hyun Cho
  • Patent number: 6487405
    Abstract: A method for controlling a plurality of service units in a telecommunications system with a multi-carrier transmission scheme is provided. Specifically, in one embodiment, the method includes broadcasting control signals for the service units over a plurality of control channels distributed in a number of subbands of a frequency bandwidth. The method further includes identifying the service unit to use the control signal with an identifier.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: November 26, 2002
    Assignee: ADC Telecommunications, Inc.
    Inventor: Mark J. Dapper
  • Patent number: 6487408
    Abstract: A mobile terminal registration system is provided for a mobile communication system having a plurality of base stations making respective radio zones and a mobile terminal that moves in the radio zone and registers its location to the base stations. The mobile terminal comprises a location registration section for detecting reception levels of signals from the base stations, calculating a difference of the largest reception level and the second reception level and registering the mobile terminal location to a base station that transmits the largest reception level signal if the difference is larger than a threshold value.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: November 26, 2002
    Assignee: NEC Corporation
    Inventor: Takaya Tokuyoshi
  • Patent number: 6477354
    Abstract: A scanning method for establishing communication between a head end and a plurality of remote units in a multi-point to point communication system is described. The method includes transmitting information from the head end to the plurality of remote units in a plurality of regions of a first frequency bandwidth, each of the regions having at least one control channel associated therewith, identification information corresponding to each of the remote units of the plurality of remote units being periodically transmitted from the head end on the at least one control channel of one of the plurality of regions of the first frequency bandwidth.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: November 5, 2002
    Assignee: ADC Telecommunications, Inc.
    Inventors: Harold A. Roberts, Jeffrey Brede, Mark S. Wadman, Robert J. Kirscht, James J. Herrmann, Michael J. Fort
  • Patent number: 6477379
    Abstract: A system and method are provided for determining the location or position of a mobile station (MS) within a digital wireless network when only two base stations are available for time of arrival or other triangulation measurements. A call setup is initiated concurrently with the gathering of timing advance or other such location data on the targeted MS, thereby allowing cell sector information to be collected. This data, along with the locating data, is then reported to a Master Positioning Center where distance calculations are made from the locating data. Positional ambiguities are then resolved with a comparison to the serving cell identity recovered during the call placement to the mobile when the locating data was being taken.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: November 5, 2002
    Assignee: Ericsson Inc.
    Inventor: Christopher Hugh Kingdon
  • Patent number: 6473612
    Abstract: A mobile telephone, or personal communication services subscriber who wishes directory assistance services is connected in the conventional manner to an operator who identifies a destination telephone number desired by the subscriber. As known in the prior art, the operator then initiates a call connecting the subscriber to the destination telephone number. In a preferred embodiment, the operator locates a desired destination telephone number in a computer database, and can select automatic dialing of the located number. Further, rather than dropping all further involvement with the call, the preferred embodiment of the present invention continually monitors the connection thereby established for a predetermined DTMF signal issued by the customer, such as that obtained by pressing the “*” button. If such a signal is detected, the customer is transferred to a directory assistance operator, who can then provide whatever further assistance is needed (e.g., providing further directory assistance).
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: October 29, 2002
    Assignee: Metro One Telecommunications, Inc.
    Inventors: Patrick M. Cox, Adrian P. Powell, Paul W. Filliger, Michael A. Kepler, Timothy A. Timmons
  • Patent number: 6470173
    Abstract: A filter unit comprises a wideband bandpass filter; at least one band-elimination filter having a stop band within the passband of the bandpass filter, so that the passband is divided into a plurality of pass bands by the stop band; and the wideband bandpass filter and the band-elimination filter being disposed in a single dielectric member. Since the passband of a wideband bandpass filter is divided into a plurality of pass bands by stop bands of one or more band-elimination filters, signals having frequencies corresponding to these divided pass bands are able to pass through the filter unit simultaneously.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: October 22, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takahiro Okada, Jinsei Ishihara, Hideyuki Kato
  • Patent number: 6466782
    Abstract: A system with a mobile phone capable of receiving a paging message. A method and apparatus automatically transmits a callback message to a callback number associated with the caller in response to a page message. The user of the system prepares a data structure in which a caller ID of each of the prospective callers in associated with information on the caller as well as the caller's communication device. In response to the reception of a page message, the user can display a response message used for calling back the caller when the user is busy. When the user selects the response message, the call back message is compiled using a call back number associated with a caller ID contained in the page message. The callback message can then be sent to the caller.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: October 15, 2002
    Assignees: Matsushita Communication Industrial Co., Ltd., NTT Mobile Communications Network, Inc.
    Inventors: Hironari Ishikawa, Hitoshi Itakura, Hisashi Nakagomi
  • Patent number: 6467092
    Abstract: A method of transmitting data in a communication system is provided. The method includes adjusting upstream power levels in a multipoint-to-point communications system having a head end and a plurality of service units is provided. The method includes measuring power levels of signals from the service units at the head end and comparing the power levels with a nominal power level. Further, the method provides at least one coarse adjustment at the service units to correct for large variations between the measured power level nominal power level and at least one fine adjustment at the head end to correct for smaller variations between the measured power level and the nominal power level.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: October 15, 2002
    Assignee: ADC Telecommunications Inc.
    Inventors: Michael J. Geile, Harold A. Roberts, Michael J. Fort, Jeff Solum
  • Patent number: 6463271
    Abstract: A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode. A paging function for incoming analog cellular communication is carried out on a CDPD channel. The handset distinguishes between paging signals identifying CDPD mode communications and paging signals identifying analog cellular communications. The handset automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration. To maintain the security of the handset ID, AMPS communications can be set up and controlled using CDPD control channels.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 8, 2002
    Assignee: Cirrus Logic, Inc.
    Inventors: Martin K. Schroeder, Yorgos M. Peponides, Michael L. Lubin
  • Patent number: 6463268
    Abstract: A radio receiver of the is provided with a local oscillation circuit, a mixing circuit to perform a frequency conversion from a received signal into an intermediate frequency signal by using an oscillation signal generated by the oscillation circuit, an ALC circuit to detect a level of the oscillation signal and control the level of the oscillation signal at a specified value, and a switching circuit switch the operation of the ALC circuit from the operational state to the non-operational state and vice versa. The receiver thus constructed will not receive an influence from the image signal, and even when the receiver is used in an area where a strong interference wave is present, the receiver is able to operate the local oscillation circuit in a normal condition.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: October 8, 2002
    Assignee: Sony Corporation
    Inventor: Hitoshi Tomiyama
  • Patent number: 6463270
    Abstract: A communications network may include a translation server containing a NGPN-to-HLR mapping table. The translation server may be a single, centralized translation server; or several TSs may be on the network. When a number of translation servers are used, a VLR or other network entity receiving an NGPN determines which translation server contains the mapping for that NGPN. One way to do this is when a subscriber roams out of his “home” region, his NGPN is presented to the “foreign” service provider's TS. The foreign TS broadcasts a query to all other TSs in the network either simultaneously or in stages. Another way is that a VLR receiving a NGPN performs a hash function on the NGPN. The hash function identifies a translation server. The VLR may then query the translation server and obtain the NGPN-to-HLR mapping. Where a hash function is used, an extendable hash function to accommodate the addition of new TSs without changing the VLR operating systems.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: October 8, 2002
    Assignee: Telcordia Technologies, Inc.
    Inventors: Li-Fung Chang, Ravi Kumar Jain, Subhashini Rajagopalan
  • Patent number: 6463277
    Abstract: A communications system permits a personal mobile telecommunications device user, such as a cellular telephone subscriber, to complete a connection to a calling party that has attempted to reach the subscriber using the subscriber's assigned telephone number, even when the subscriber is roaming outside of his or her home area. The system includes a messaging and bridging complex having an associated database, which receives a call placed to the subscriber. If the subscriber is out of his or her home area so that the call cannot be completed, information stored in the database is used to initiate transmission of a paging signal to the subscriber. The connection to the calling party is held in the complex for a predetermined period after the paging signal is transmitted. The mobile telephone user, upon receiving the paging signal, may initiate a call from their personal mobile telecommunications device to the messaging and bridging complex, which bridges the subscriber and the calling party together.
    Type: Grant
    Filed: September 20, 2000
    Date of Patent: October 8, 2002
    Assignee: AT&T Corp.
    Inventors: Richard A. Miska, William T. Willcock
  • Patent number: 6449494
    Abstract: A portable radio telephone handset operates as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode, are available in the handset. The handset distinguishes between paging signals indicating CDPD mode communications and those indicating analog cellular communications. The handset also automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration. The handset maintains an active status on a CDPD communication channel during a “sleep mode”, when the handset can carry out AMPS activity.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: September 10, 2002
    Assignee: Cirrus Logic, Inc.
    Inventor: Russell P. Cashman
  • Patent number: 6445913
    Abstract: To provide a portable telephone system in which use of the set is automatically limited in a site where the use of the set is limited and in which causes of non-response and other various information can be transmitted to an originating party who called the use-limited portable telephone set. The system includes a portable telephone output limiting management device issuing a radio wave signal of the output limiting command information from an antenna.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: September 3, 2002
    Assignee: NEC Corporation
    Inventor: Hiroshi Ezuriko
  • Patent number: 6438355
    Abstract: A method and system enables optimal call routing in a satellite communications network when a satellite subscriber has, for example, call forwarding active. Many satellite networks re-register a satellite subscriber's (e.g., the A-subscriber's) subscription information to a satellite gateway that is most cost efficient when the satellite subscriber initiates an outgoing call. If the called party (e.g. the B-subscriber) is distant from the satellite subscriber's home country, the distant gateway to which the re-registration occurs is likely to be far from the gateway of his or her native country, which is often to where call forwarding is directed. When an incoming call from a C-subscriber is detected for the A-subscriber, the call is handled normally until call forwarding is detected in the distant gateway. Once call forwarding is detected, a satellite gateway through which the call will be completed (e.g.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: August 20, 2002
    Assignee: Ericsson Inc.
    Inventors: Inayat Syed, Martin Reichelt, Yaping Zhu
  • Patent number: 6434395
    Abstract: A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode. A paging function for incoming analog cellular communication is carried out on a CDPD channel. The handset distinguishes between paging signals identifying CDPD mode communications and paging signals identifying analog cellular communications. The handset automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: August 13, 2002
    Assignee: Pacific Communications Sciences, Inc.
    Inventors: Michael L. Lubin, Seton P. Kasmir, Kathryn A. Kubasak, Gregory A. Hein, Surendra B. Mandava, Chanchai Poonpol, Shahin Hedayat, Donald W. Burtis
  • Patent number: 6434583
    Abstract: A apparatus for providing a Fast Fourier Transform (FFT) and an inverse FFT is provided. The apparatus comprises a radix-N core. The radix-N core includes at least N multipliers. The radix-N core also includes a twiddle-factor lookup table that stores complex twiddle-factors. The twiddle-factor lookup table is coupled to one input of each of the multipliers. The radix-N core also includes a conversion random access memory (RAM) that stores transform points. The conversion RAM is coupled to another input of each of the multipliers. The radix-N core also includes an array of at least N-times-N adder-subtracter-accumulators.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: August 13, 2002
    Assignee: ADC Telecommunications, Inc.
    Inventors: Mark J. Dapper, Michael J. Geile, Terrance J. Hill, Harold A. Roberts, Brian D. Anderson, Jeffrey Brede, Mark S. Wadman, Robert J. Kirscht, James J. Herrmann, Michael J. Fort, Steven P. Buska, Jeff Solum, Debra Lea Enfield, Darrell Berg, Thomas Smigelski, Thomas C. Tucker, Joe Hall, John M. Logajan, Somvay Boualouang, Heng Lou, Mark D. Elpers, Matt Downs, Tammy Ferris, Adam Opoczynski, David S. Russell, Calvin G. Nelson, Niranjan R. Samant, Joseph F. Chiappetta, Scott Sarnikowski
  • Patent number: 6430417
    Abstract: In a cellular mobile radiotelephone system, two different digital burst access methods are defined using to the greatest extent possible previously defined burst structures. The type of access method to be used in a particular cell is indicated on that cell's control channel. In very large cells, a two-burst access method is used including a shortened pre-access burst and a regular access burst. The shortened pre-access burst avoids collision with other bursts and provides time-alignment information to the cell's base station. In response to a time-alignment order, the mobile station then transmits a regular access burst. In smaller cells, a regular single-burst access procedure is used. The access methods use existing burst structures except that the fields CDVCC and SACCH are used for different purposes that may include improved synchronization, control channel identification and reservation of time slots for multi-burst access.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: August 6, 2002
    Assignee: Ericsson Inc.
    Inventors: Krister Raith, Nils Rydbeck
  • Patent number: 6421538
    Abstract: A radio telephone (200) is operable in a cordless telephone system or in a cellular telephone system. The telephone (200) incorporates circuitry to detect user velocity so that when the user travels more quickly the telephone automatically transfers from cordless mode, which is the preferred mode, to cellular mode. This prevents the degeneration in communication quality which frequently occurs when a user of a cordless system travels faster than walking pace.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: July 16, 2002
    Assignee: Nokia Mobile Phones, Limited
    Inventor: John Daniel Byrne