Abstract: A mobile packet network call is established over a transmission link, extending between a mobile terminal device and a given interworking function. The transmission link connects the mobile terminal device to a wireless communication device over a first interface and further connects the wireless communication device to the given interworking function over a second interface via a wireless link to a base station. The transmission link further comprises a packet mode in which the traffic channel is up and a dormant mode in which the traffic channel is down while the data link layer link and the network layer link are maintained. Network region identifier information is provided to the wireless communication device. The wireless communication device determines when the given interworking function has changed from a first interworking function to a second interworking function by determining when there is a corresponding change in the network region identifier information.

Abstract: The present invention is a novel and improved method and circuit for digital signal processing. One aspect of the invention calls for the use of a variable length instruction set. A portion of the variable length instructions may be stored in adjacent locations within memory space with the beginning and ending of instructions occurring across memory word boundaries. Furthermore, additional aspects of the invention are realized by having instructions contain variable numbers of instruction fragments. Each instruction fragment causes a particular operation, or operations, to be performed allowing multiple operations during each clock cycle. Thus, multiple operations are performed during each clock cycle, reducing the total number of clock cycles necessary to perform a task. The exemplary DSP includes a set of three data buses over which data may be exchanged with a register bank and three data memories.

Abstract: A method and apparatus that allows correlations between a selected parameter and the error in a pseudo range measurement to be exploited. A database is established in which the amount of error estimated for particular pseudo range measurements to a beacon is maintained. Clusters are defined. Each cluster is associated with a range of values for the selected parameter. Pseudo range measurements are then associated with a particular cluster based upon the value of the selected parameter at the time (or proximate to the time) the pseudo range measurement was taken. As more estimates of the pseudo range measurements are made, the size of the clusters (i.e., the range of values of the selected parameter) can be reduced. Due to the correlation between the selected parameter and the errors in the pseudo range measurements, reducing the size of the clusters reduces the variance of the error estimates. The mean value of the error estimates is used to correct the error in future pseudo range measurements.

Abstract: The system accepts a Short Message System data packet transmitted from a cell site to a mobile station and updates the contents of an address book located in a non-volatile RAM within the mobile station. Upon the occurrence of an event, such as a change in the area code, the system automatically updates the phone book so that a person does not have to perform the tedious task of determining which exchange prefixes within an area code have been affected and then manually updating large numbers of address book entries.

Abstract: A wireless communication system attempts to acquire service from one of a plurality of possible service provider systems. If service is acquired by a less desirable service provider system, the wireless communication system of the present invention constructs an alternate list of more desirable service provider systems and periodically attempts to acquire service from a more desirable service provider system. The wireless communication system may include a most recently used (MRU) list of recently acquired service provider systems. The MRU list may be used to sort the list of alternate service provider systems so that the alternate list of service provider systems will first list those service provider systems that are also contained in the MRU list. Data entries that are contained in both the alternate scan list and the MRU list are sorted in accordance with the position of the service provider system within the MRU list.

Abstract: A control mechanism that can be used to control a &Sgr;&Dgr; ADC to provide the required level of performance while reducing power consumption. The &Sgr;&Dgr; ADC is designed with multiple stages (i.e., loops or sections), and provides improved performance (e.g., higher dynamic range) as more stages are enabled. The control mechanism selectively enables a sufficient number of stages to provide the required performance and disables remaining stages to conserve power. The control mechanism achieves this by measuring one or more characteristics (e.g., signal level) of the ADC input signal through a &Sgr;&Dgr; ADC that is similar to the &Sgr;&Dgr; ADC on the signal path, comparing the measured characteristic(s) to particular threshold level(s), and controlling the stages such that the desired objectives are achieved. In one implementation, the control circuit includes one or more detector stages, a conditioning circuit, and a signal processor.

Abstract: A bias circuit is described for use in biasing an operational amplifier to maintain a constant transconductance divided by load capacitance (i.e. a constant gm/CL) despite temperature and process variations and despite body effects. In one example, the bias circuit includes a pair of current source devices and a switched capacitor (SC) equivalent resistor circuit for developing an equivalent resistance between the current source devices. The equivalent resistor circuit includes a sampling capacitor. First and second clock inputs are connected to the capacitor providing non-overlapping clock signals at a predetermined sampling frequency to establish a resistance equivalent. By providing an SC equivalent resistor circuit clocked by non-overlapping fixed clock signals, the gm/CL of the bias circuit is maintained substantially constant. Hence, a fixed bandwidth is maintained within the operational amplifier being biased.

Abstract: The flash and SRAM memory are embedded within an application specific integrated circuit (ASIC) to provide improved access times and also reduce overall power consumption of a mobile telephone employing the ASIC. The flash memory system includes a flash memory array configured to provide a set of individual flash macros and a flash memory controller for accessing the flash macros. The flash memory controller includes a read while writing unit for writing to one of the flash macros while simultaneously reading from another of the flash macros. By permitting read while writing, read operations need not be deferred until completion of pending write operations. The flash memory controller also includes programmable wait state registers. Each wait state register stores a programmable number of flash bus wait states associated with a portion of the flash memory.

Abstract: A two-stage stacked high IIP3 LNA with low current consumption is presented. Low-impedance bias terminations and optimum inter-stage match are used for IIP3 enhancement. A new graphical design technique is introduced for optimizing the linearity trade-offs in two-stage amplifiers and for optimizing the on-chip inter-stage matching network. Also, novel active circuits for bias modulation suppression are discussed. The LNA has been fabricated in a commercial SiGe BiCMOS technology, and measurement results are presented.

Abstract: A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.

Abstract: The flash and SRAM memory are embedded within an application specific integrated circuit (ASIC) to provide improved access times and also reduce overall power consumption of a mobile telephone employing the ASIC. The flash memory system includes a flash memory array configured to provide a set of individual flash macros and a flash memory controller for accessing the flash macros. The flash memory controller includes a read while writing unit for writing to one of the flash macros while simultaneously reading from another of the flash macros. By permitting read while writing, read operations need not be deferred until completion of pending write operations. The flash memory controller also includes programmable wait state registers. Each wait state register stores a programmable number of flash bus wait states associated with a portion of the flash memory.

Abstract: A low power programmable digital filter adapted for use with a telecommunications system transceiver. The digital filter includes a first finite impulse response filter section for receiving an input signal and having a first transfer function. An infinite impulse response filter section is connected to the first finite impulse response filter section and has a second transfer function. A second finite impulse response filter section is connected to the infinite impulse response filter section and outputs a filtered output signal in response the receipt of the input signal by the programmable digital filter. The second finite impulse response filter section has a third transfer function. A programmable coefficient is included in the first, second, and/or the third transfer function. In a specific embodiment, the first transfer function has a first programmable coefficient. The second transfer function has a second programmable coefficient and the third transfer function has a third programmable coefficient.

Abstract: An in-phase clock signal CLK_I drives a first pair of connected data flip-flops (DFFs) (302) and (308), with feedback through a NOR gate (310) and output through an in-phase OR gate (320). The output signal OUT_I is a clock signal with a third of the frequency of CLK_I. A quadrature-phase clock signal CLK_Q drives a second pair of (DFFs) (504) and (506), with output through a quadrature OR gate (508). The output signal OUT_Q is a clock signal with a third of the frequency of CLK_Q, and in quadrature with OUT_I.

Abstract: A wireless communication device (101) is coupled to an external keyboard (126) through an input/output (I/O) connector (128) mounted on the housing of the wireless communication device (101). The external keyboard (126) includes individual keys for alphabetic characters and numeric characters to permit the easy entry of alphanumeric text for text messaging transmissions by the wireless communication device (101). The keyboard may include a keyboard body (138) with an aperture (144) size to receive and retain the wireless communication device. The I/O connector (128) on the wireless communication device (101) mates with a corresponding keyboard connector (129) located within the aperture (144) of the keyboard body (138).

Abstract: The present invention is a novel and improved technique for decoding with particular application to turbo, or iterative, coding techniques. In accordance with one embodiment of the invention a system for decoding includes a channel deinterleaver RAM for storing a block of symbol estimates and for reading out at least three different portions of said block in substantially simultaneous fashion. A set of 3 state metric calculators receives the three portion in a substantially simultanous fashion and generate corresponding sets of state metric calculations from said three portions of the channel deinterleaver block.

Abstract: A system and method for affecting the behavior of the transmitting UART that, in turn, results in an internal state change in the receiving UART. The present invention, upon detecting a PPP packet, flow controls the line, causing the transmitting UART to force a marking condition (that is, all ones) or idle state. This idle state enables the receiving UART to exit sampling mode and receive the remaining incoming data within the PPP packet in byte mode. The receiving UART, when operating in byte mode, automatically accounts for slew.

Abstract: A method, within a wireless communication system, and a wireless MT2 device which provide for the resynchronization of a PPP link on each one of a Um and Rm interface without affecting the other of the Um and Rm interface. When a handoff is performed, such that the communications of the mobile MT2 device is handed off to a new BS/MSC, the Um interface will undergo PPP configuration renegotiation without causing the Rm interface also to undergo PPP configuration renegotiation. Similarly, when the Rm interface undergoes PPP configuration renegotiation, the Um interface will not undergo PPP configuration renegotiation.

Abstract: A switch (212) is included in a wireless terminal (206). Different settings of the switch cause a processor (210) in the wireless terminal to use different device algorithms. The switch itself is set by applying a code signal to the wireless terminal through its RJ-11 interface (208). The code is a sequence of Dual Tone Multiple Frequency (DTMF) tones, which may conveniently be provided by an ordinary telephone (214), or by a computer modem (204). A single wireless terminal may therefore be reconfigured on demand to interface with any of a variety of devices (202), (214).

Abstract: The present invention is a novel and improved method and apparatus for performing frame identification. In accordance with one embodiment of the invention, a received frame of data is processed by generating estimates of the received frame, measuring a correlation between said estimates and stored estimates of a previously improperly received frame, processing the received frame as a retransmitted frame when said correlation is greater than a first threshold, processing the received frame as a new frame when said correlation is less than a second threshold, wherein said second threshold is less than or equal to said first threshold.

Abstract: A dual strip antenna that includes first and second conductive strips, each made from a conductive material. The first and second strips are separated by a dielectric substrate having a predetermined thickness. The first strip is electrically connected to the second strip at one end. A coaxial signal feed is coupled to the dual strip antenna. A dual strip antenna can be reduced in overall size by utilizing a periodic mesh patterned conductive surface in place of a solid continuous conductive surface. The periodic mesh pattern maintains the relative voltage and current relationships across the antenna strip while enabling a reduction in physical size. Any uniform periodic mesh pattern may be used and the periodic mesh pattern may be utilized for both strip elements. A brick-wall mesh pattern results in approximately 10% reduction in size over a solid continuous dual strip antenna.