Patents Represented by Attorney, Agent or Law Firm Jeff Measures
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Patent number: 6389034Abstract: This invention proposes a novel common packet data channel (CPDC) system structure and method to efficiently provide variable-rate packet data services in CDMA system. This system uses common code channels to serve packet data calls for a plurality of packet data users within a cell or sector. On the forward link (base station-to-mobile), an ATM-type multiplexing scheme is employed on a common code channel, while a spread ALOHA-type random access scheme is used on the reverse link (mobile-to-base station). The overhead due to call setup and channel assignment in a conventional circuit-switched system is not required in this system. The delay due to the call setup is reduced. In addition, ATM cells can be directly transmitted over the air interface. Novel transceiver architectures for the terminal and base station for implementing a system as well as particular channel signal structures are disclosed.Type: GrantFiled: September 4, 1998Date of Patent: May 14, 2002Assignee: Nortel Networks LimitedInventors: Ning Guo, Leo Strawczynski
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Patent number: 6373842Abstract: A high layer protocol organizes Unidirectional Streaming Services (USS) data into frames and said data is transmitted to the wireless user's terminal. The USS data is not delivered until a criteria is satisfied, e.g., the receive buffer is filled to an appropriate value. After the USS data is received, the receiver verifies the received frames. If an error is detected a message is sent from the wireless terminal to the server (providing the unidirectional streaming service) requesting retransmission of the corrupted frame. This is a form of ARQ protocol. If the retransmitted frame arrives prior to the time that frame needs to be delivered, the corrupted frame is replaced by the retransmitted frame. Otherwise, if the retransmitted frame is not received prior to the time that frame needs to be delivered, the corrupted frame is reconstructed. Any retransmitted frame which arrives too late is discarded.Type: GrantFiled: November 19, 1998Date of Patent: April 16, 2002Assignee: Nortel Networks LimitedInventors: Paul Coverdale, Leo Strawczynski
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Patent number: 6336031Abstract: A transmitter includes a pair of electrodes separated in space, and transmit circuitry for varying the voltage difference applied across the electrodes in order to vary the spatial gradient of the electric potential field generated by the transmitter in accordance with the data to be transmitted. The receiver includes a pair of electrodes separated in space and receive circuitry which detects these variations in the quasi-electrostatic potential field in order to receive the transmitted data. Thus the receive electronics unit includes a detector connected to said electrodes for producing a signal which varies as the spatial gradient of the electric potential field across the receive electrodes varies but which does not depend on changes in potential within any given electrode.Type: GrantFiled: December 22, 1998Date of Patent: January 1, 2002Assignee: Nortel Networks LimitedInventor: Andre Van Schyndel
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Patent number: 6330289Abstract: Base station multi-channel power amplifier (MCLPA) performance is improved by reducing intersymbol correlation. The system produces a number of bit stream signals to be modulated into a number of symbol stream signals, and includes means for introducing an offset/time delay to the symbol stream signals to avoid correlation of the symbol transitions in the MCLPA. By doing this, the system avoids multiple symbols going into transition at the same time. By preventing the signal peaks from occurring at the same time and reinforcing to form a larger peak signal, the system reduces the maximum peak signal power, without adversely affecting the average signal power. This reduces the peak power requirements placed on the MCLPA. Preferably the sum total of all offsets is less than one symbol period.Type: GrantFiled: October 16, 1998Date of Patent: December 11, 2001Assignee: Nortel Networks LimitedInventors: Dusty Keashly, Eric Stephen Fayeski
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Patent number: 6304582Abstract: An improved local synchronization module which uses Frequency-phase adaptive double locked loop (FPADLL) to control a stable controllable oscillator is disclosed. A single physical feedback loop is implemented which can operate in either a phase locked loop mode or a frequency locked loop mode. The sync module includes a controller which determines in which mode the feedback loop operates. The controller also uses slipping information from a network reference recovery interface to reduce slipping. Also effects of ageing of the stable controllable oscillator are predicted and compensated for.Type: GrantFiled: December 24, 1997Date of Patent: October 16, 2001Assignee: Nortel Networks LimitedInventors: Genzao Zhang, Roland Smith, Dan Oprea, Roger Ferland
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Patent number: 6271835Abstract: A touch screen input device for improving the input of alphanumeric data in an area of limited space. The input device employs a multi-touch method of input which is intuitive to a first time user. The device maps a plurality of characters to each of its input keys and upon selection of a key subsequently re-labels the input keys with the characters displayed on the selected key. The device is intuitive to a first time user since the input keys are re-labeled in manner which corresponds to their relative position within the selected input key. In comparison to single stroke input devices this device reduces the number of keys required for data input. Alternatively a user could select a single character without employing the multi-touch method by selecting a pre-defined element of a particular input key.Type: GrantFiled: September 3, 1998Date of Patent: August 7, 2001Assignee: Nortel Networks LimitedInventor: Henry Hoeksma
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Patent number: 6226380Abstract: The invention provides an adaptive echo canceller and method for detecting double talk (DT) and echo path change (EPC) conditions and for distinguishing therebetween. DT and EPC conditions are detected by comparing a generated echo return loss enhancement (ERLE) signal with a selected ERLE threshold level. Similarly, the energy level of the echo canceller incoming signal is compared with a second threshold level. If the level of the ERLE signal is below its threshold and the level of the incoming signal is above the second threshold, a DT or EPC condition is deemed to exist and a predetermined signal is generated. Responsive to this signal, an orthogonality monitor recognizes the predetermined signal as representing either a DT or EPC condition.Type: GrantFiled: February 19, 1998Date of Patent: May 1, 2001Assignee: Nortel Networks LimitedInventor: Heping Ding
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Patent number: 6212389Abstract: In methods and apparatus for controlling allocation of traffic channels in a telecommunications network having macrocells and microcells within the macrocells, a macrocell traffic channel is allocated in response to a request for a microcell traffic channel only when no suitable microcell traffic channel is available, a suitable macrocell traffic channel is available, and the requested microcell traffic channel is requested to implement a microcell to microcell handoff. Allocation of the macrocell traffic channel may further be conditional on a grade of service in the macrocell being deemed acceptable. The grade of service may be deemed acceptable when number of macrocell traffic channels assigned to each microcell is less than a predetermined maximum number of allowable macrocell traffic channels that can be assigned to each microcell (cutoff value) or when more than a threshold number of macrocell channels are available in the macrocell.Type: GrantFiled: July 31, 1998Date of Patent: April 3, 2001Assignee: Nortel Networks LimitedInventor: Abraham O. Fapojuwo
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Patent number: 6178215Abstract: An improved local synchronization module which uses Frequency-phase adaptive double locked loop (FPADLL) to control a stable controllable oscillator is disclosed. A single physical feedback loop is implemented which can operate in either a phase locked loop mode or a frequency locked loop mode. The sync module includes a controller which determines in which mode the feedback loop operates. The controller also uses slipping information from a network reference recovery interface to reduce slipping. Also effects of ageing of the stable controllable oscillator are predicted and compensated for.Type: GrantFiled: December 24, 1997Date of Patent: January 23, 2001Assignee: Nortel Networks LimitedInventors: Genzao Zhang, Roland Smith, Dan Oprea, Roger Ferland
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Patent number: 6118773Abstract: A diversity selection process which tests to determine whether poor reception is caused by co-channel interference or multipath fading is disclosed. The impairment is determined by first testing the quality over several frames. Unless the quality is poor over these several frames, the system tests for multipath fading by selecting the antenna with the greater signal strength, provided no hold condition exists. However, if poor quality has been present over the several frame period, the system selects the other antenna if its RSSI is greater. However, the system also tests the RSSI received on the current antenna and determines the impairment was co-channel interference if the signal of quality was sufficiently high. In which case a hold condition is set for a number of frames to prevent excessive switching.Type: GrantFiled: December 20, 1996Date of Patent: September 12, 2000Assignee: Nortel Networks CorporationInventor: Stephen Ross Todd
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Patent number: 6104915Abstract: An improved local synchronization module which uses Frequency-phase adaptive double locked loop (FPADLL) to control a stable controllable oscillator is disclosed. A single physical feedback loop is implemented which can operate in either a phase locked loop mode or a frequency locked loop mode. The sync module includes a controller which determines in which mode the feedback loop operates. The controller also uses slipping information from a network reference recovery interface to reduce slipping. Also effects of ageing of the stable controllable oscillator are predicted and compensated for.Type: GrantFiled: December 24, 1997Date of Patent: August 15, 2000Assignee: Nortel Networks CorporationInventors: Genzao Zhang, Roland Smith, Dan Oprea, Roger Ferland