Abstract: A method and apparatus for operating a cellular telephone system that supports performing an inter-system soft handoff is described. A subscriber unit generates a pilot strength measurement report when the pilot channel from a base station is detected. When a base station controller receiving the pilot strength measurement report determines that the base station is part of a second cellular telephone system, a inter-system soft handoff request is generated. An admission control subsystem receives the inter-system soft handoff and either grants or denies the request base on the traffic level with the second cellular telephone system. In a preferred embodiment of the invention, the traffic level is determined based on link load messages received periodically by the admission control subsystem that are generated by an interface port coupled to an interconnect between the first cellular telephone system and the second cellular telephone system.
April 29, 1997
Date of Patent:
December 14, 1999
Paul E. Bender, Toni L. Holcman, Gadi Karmi, Kuo-Chun Lee, Suzanne M. Lueder, Bibhu P. Mohanty, Robert C. Ottinger, Roy F. Quick, Jr., Steven P. Stachwick, Todd Sutton, Venkat Tangirala, Noam A. Ziv
Abstract: A method and apparatus for canceling both earseal and hybrid echo in a Wireless Local Loop telephone system is disclosed. The present invention operates within a subscriber station having a plurality of telephone inputs, one of which is a dedicated handset and at least one other input being a standard analog telephone. During a conference call between a far end speaker and two near end speakers, the far end speaker may hear an echo of his own voice due to an earseal echo generated by the dedicated handset and a hybrid echo generated by a 4-to-2 wire hybrid interface within the subscriber station. In accordance with the present invention, two distinct echo cancellers are used in the subscriber station to reduce the two types of echo. A first echo canceller is optimized to remove the earseal echo generated at the dedicated handset while a second echo canceller is optimized to remove the hybrid echo generated at the 4-to-2 wire hybrid.
Abstract: A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose of this invention is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.
Abstract: A connector interface provides direct connection from a wireless communication device to a coaxial connector. The wireless communication device has a housing with an antenna connector. The antenna connector has a hollow pseudo-cylindrical center providing an opening through the housing. The connector interface has a custom connector comprised of an outer conductive shell, a nonconductive spacer and a ground probe. The outer conductive shell is mounted on the printed circuit board. The nonconductive spacer is disposed within the hollow pseudo-cylindrical center of the outer conductive shell. When the connector interface is connected to the wireless communication device, the outer conductive shell contacts the antenna connector and the ground probe extends through the opening into the housing to connect electrically to a ground potential within the housing.
December 15, 1997
Date of Patent:
December 7, 1999
Qualcomm Incorporated, Sony Electronics Inc.
Raymond C. Wallace, Jose F. Olivas, Susan M. Tidwell, Roger W. Berg, Thomas A. Pitta, Darrin Marthens
Abstract: A multiple frequency coupler establishes a low noise communication path, through the windshield of a vehicle, from a multiple frequency wireless telephone or multiple single frequency telephones, each operating at a different frequency, in the vehicle to the exterior of the vehicle. The coupler includes two preferably like-shaped internal and external elements that are oriented face to face with each other, with the windshield sandwiched between them. Each element is tapered, and the elements are juxtaposed with each other such that the wider end of one element is generally opposite the narrower end of the other. Also, a multiple frequency radiator is attached to the external element. The radiator includes plural radiating elements that are separated from each other and that are attached to a common base, with each radiating element being configured for radiating a respective frequency.
Abstract: A support assembly for supporting a plurality of inclined plates (22) arranged in an array around a central axis includes a top support bracket (25) for supporting the upper edges (40) of the plates (22) and a plurality of base brackets (26) for supporting the lower edges (62) of the respective plates (22). The top support bracket (25) has a central axis aligned with the central axis of the array, and a plurality of side edges (28). Each side edge (28) has a downwardly inclined rim (32) at a predetermined angle corresponding to the desired plate orientation and a downwardly facing groove (42) for receiving the upper edge (40) of the respective plate (22).
Abstract: Independently controlling the transmitted power of each subchannel by a subchannel control loop is described. A transmitting station generates a channel made up of a sum of subchannels wherein each subchannel or group of subchannels is amplified with a unique gain value that is varied in accordance with subchannel power control messages from the receiving station. The receiving station generates each subchannel power control message subsequent to monitoring and calculating metrics based on that received subchannel.
Abstract: A coupled multi-segment helical antenna is provided having a length that is shorter than otherwise obtainable for a conventional half-wavelength antenna. The coupled multi-segment helical antenna includes radiator portion having a plurality of helically wound radiators extending from one end of the radiator portion to the other end of the radiator portion. Each radiator is made up of a set of two or more segments. A first segment extends in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion. The second segment extends in a helical fashion from the second end of the radiator portion toward the first end of the radiator portion, wherein a portion of the first radiator segment is in proximity with a portion of the second radiator segment such that the first and second radiator segments are electromagnetically coupled to one another.
Abstract: Method and apparatus for enhancing diversity in spread spectrum type communication systems by creating pseudo-multipath conditions or links for certain communication signals. The invention provides alternative or additional signal paths, for signals being transferred between gateways and communication system users through one or more a satellite repeaters. These additional paths are used to establish and maintain adequate signal diversity as well as certain signal links by remote subscribers in heavy urban areas. In further aspects of the invention, diversity enhancers can employ high gain parabolic antennas and tracking mechanisms, or passive reflective surfaces. Signals can be relayed to subscriber units in canyon type blocked areas or within structures.
Abstract: A hinge assembly rotatably connects one end of a cover to a phone body for rotation about a hinge axis between a closed position and an open position. The hinge assembly has a first part secured to the phone body, a second part rotatably secured to the first hinge part and rigidly secured to the cover, and a hinge release shaft secured against rotation relative to the first hinge part and extending into the second hinge part. The release shaft and second hinge part have interengageable latch formations for preventing rotation between the hinge parts when the cover is in the closed position. The release shaft is movable between an extended position in which latch formations engage and a retracted position in which the latch formations are released. A spring part rotates the cover into the open position when the latch is released. A manual override of the latch is provided.
Abstract: A novel and improved method and apparatus for coherently processing a CDMA signal without the use of pilot or other synchronization information is described. By utilizing a coherent receive processing system, a reverse link signal can be properly processed when received at a lower power level than that associated with noncoherent only processing. This reduces the transmit power necessary for successful communication, and this reduction in necessary transmit power reduces the degree to which a set of subscriber units communicating with the same base station interfere with one another. In turn, this increases the overall system capacity of a CDMA wireless telecommunication system incorporating the invention.
July 29, 1996
Date of Patent:
November 16, 1999
Ephraim Zehavi, Serge Willenegger, Joseph P. Odenwalder
Abstract: A method and apparatus for controlling the transmit power of a high rate code division multiple access (CDMA) link is described. The channel condition to a subscriber unit is evaluated and the configuration of a high rate link in soft handoff is based on the channel condition. If a fading channel is detected the supplemental channels of the high rate link are transmitted from multiple base stations. If a non-fading channel is detected the supplemental channels of the high rate link are transmitted from a single base station. Parameters monitored to determine the channel condition include the pilot strength, pilot code offset and error rate.
Abstract: A ground clip apparatus is designed to make ground contact between two circuit boards as they are mated together. A standoff member is mounted on one of the boards and a spring clip member is mounted on the other board facing the standoff member. The spring clip member has spring arms which are biased against the standoff member when the boards are mated together to make a reliable ground contact. At the same time, the standoff member resists deflection of either board towards the other board.
December 3, 1997
Date of Patent:
November 16, 1999
QUALCOMM Incorporated, Sony Electronics Inc.
Abstract: A dual-band coupled-segment helical antenna provides operation in two frequency bands. The dual-band coupled-segment helical antenna includes a radiator portion having two sets of one or more helically wound radiators extending from one end of the radiator portion to the other end of the radiator portion. Radiators of the first set of radiators are comprised of two segments: a first radiator segment extends in a helical fashion from one end of the radiator portion toward the other end of the radiator portion; and a second radiator segment is U-shaped and extends in a helical fashion from the first end of the radiator portion toward the second end of the radiator portion. Radiators of the second set of radiators are comprised of a radiator disposed within said U-shaped segment. The first set of radiators resonates at a first frequency and the second set of radiators resonates at a second frequency thereby providing dual-band operation, with minimal coupling between the frequency bands.
Abstract: A pallet tray for supporting a CCA chassis during assembly and transportation has a generally flat base with opposite first and second ends, and first and second end rails secured adjacent the first and second ends, respectively, so as to project upwardly from the base. Each end rail has an upper, generally flat support surface spaced a predetermined distance above the base, the support surface having an outer edge adjacent the respective end of the base, and a lip projecting upwardly from the outer edge of the support surface.
Abstract: A steerable antenna system for adjusting the elevation of an antenna for communication with a central facility via a satellite. The steerable antenna system includes a motor, a spindle drivingly engaged to the motor, and a chassis fixedly disposed on the spindle. The chassis has a stop disposed about its periphery. A first waveguide is fixedly disposed on the chassis and a second waveguide is disposed on an antenna. A ring cam is mounted on the chassis, and a grooved is formed in the ring cam. A first portion of a lever arm is pivotally mounted on the chassis and a second portion of the lever arm is disposed in the groove of the ring cam. An antenna is hingedly mounted on the chassis and to the lever arm. A solenoid, disposed on a base of the steerable antenna system, is configured to engage a portion of the ring cam. In use, when the solenoid is activated, power from the motor is used to adjust the elevation of the antenna.
Abstract: A combination antenna and input device for a wireless communications device is disclosed. The antenna is coupled by a link to a position sensor that senses user movement of the antenna. In one embodiment, the antenna is rotatably retained within a housing and may be manipulated by the user. The position sensor detects rotational movement of the antenna and thereby controls functionality of the wireless communications device. The antenna may also be displaced along a longitudinal axis to enable user-selected functions. The position sensor may be mechanical, optical, or other form of electrical rotational position sensor.
Abstract: In a code division multiple access (CDMA) spread spectrum cellular communication system in which a mobile station user communicates with another system user via at least one base station, wherein each base station transmits a common pilot signal of a different PN offset with respect to other base stations in said system, a method for merging neighbor lists to account for false indications of signal strength due to topography. The merged list, included as part of the Neighbor List Update Message, is arrived at by first measuring pilot signal strengths and phase delays received by the mobile station and reporting this information to the mobile telephone switching office. At the mobile telephone switching office, pilots whose phase delay indicates a large round trip delay time are ignored in subsequent calculations. Then a neighbor list union is generated as the union of all predetermined neighbor lists corresponding to said received pilot signals.
Abstract: Method and apparatus to prevent system deadlock in a dispatch system by monitoring link activity. The dispatch system is comprised of a set of remote units which communicate with each other by broadcasting one at a time to the group. A remote unit communicates with the other remote units through at least one base station. A communications manager grants a remote unit exclusive system talker status upon request through the base station servicing the requesting remote unit. The base station monitors a series of data from the remote unit designated as the system talker to detect voice activity. The base station sends a surrogate request to the communications manager to relinquish the system talker privilege if the voice activity falls below a predetermined threshold.