Methods and apparatus for providing wireless communications using subframe partitioning are disclosed. Two or more base stations may be allocated subframes in a radio frame. All or part of the subframe allocation may be provided to the associated user equipment (UEs), which may use it to determine signal metrics during assigned subframes for an associated base station.

Methods and apparatus for subframe interlacing in heterogeneous networks

Methods and apparatus for partitioning resources for enhanced inter-cell interference coordination (eICIC) are provided. Certain aspects involve broadcasting a message indicating time-domain resource partitioning information (RPI), where a user equipment (UE) may be operating in idle mode. With the RPI, the UE may be able to identify protected resources with reduced/eliminated interference from neighboring cells. The RPI in this broadcasted message may be encoded as a bitmap as an alternative or in addition to enumeration of the U/N/X subframes. Other aspects entail transmitting a dedicated or unicast message indicating the time-domain RPI, where a UE may be operating in connected mode. With the RPI, the UE may be able to determine channel state information (CSI), make radio resource management (RRM) measurements, or perform radio link monitoring (RLM), based on one or more signals from a serving base station during the protected time-domain resources.

Resource Partitioning Information for Enhanced Interference Coordination

A surface mount crystal oscillator comprises a crystal blank, an IC chip having an oscillation circuit integrated thereon, and a hermetic package for accommodating the crystal blank and IC chip therein. The hermetic package comprises a substantially rectangular ceramic substrate formed with a metal film which makes a round on one main surface thereof, and a concave metal cover having an open end face bonded to the metal film. The IC chip is secured to the one main surface of the ceramic substrate through ultrasonic thermo-compression bonding using bumps, the crystal blank is disposed above the IC chip, and the ceramic substrate has the one main surface formed as a flat surface.

Surface mount type crystal oscillator

A method and apparatus for digitally controlling the capacitance of an integrated circuit device using MOS-FET devices. In accordance with one aspect of the present invention, a one-bit or 'binary' varactor is presented wherein the gate-to-bulk capacitance of the MOS-FET device exhibits dependency to a D.C. voltage applied between its gate and well implant regions. The capacitance of the binary capacitor can be changed from simply by changing the polarity of the applied D.C. voltage from a positive to a negative value. A plurality of binary capacitors are configured in a parallel arrangement to produce a digitally controlled capacitor. The digitally controlled capacitor can be used in any integrated circuit requiring a tightly controlled tuned network. One application is a voltage-controlled oscillator (VCO) wherein the center output frequency of the VCO is calibrated by digitally modifying the capacitance of the VCO's digitally controlled capacitor.

Method and apparatus for digitally controlling the capacitance of an integrated circuit device using mos field-effect transistors

Methods and apparatus for performing radio resource management (RRM) measurements in a heterogeneous network (HetNet) are provided in an effort to prevent failure of RRM measurement procedures in a dominant interference scenario. Several alternatives are provided for determining particular resources (e.g., subframes) to use for performing the RRM measurements, wherein the particular resources are based on cooperative resource partitioning between cells of the HetNet, wherein the cells may be of different types (e.g., macro, pico, or femto cells). These alternatives include, for example: (1) intra-frequency or intra-RAT (radio access technology) alternatives, which may involve transmitting resource partitioning information (RPI) in or deriving non-serving cell RPI based on the serving cell's RPI, as well as (2) inter-frequency or inter-RAT alternatives, where the RRM measurements may be performed during a measurement gap.

Heterogeneous network (HetNet) user equipment (UE) radio resource management (RRM) measurements

A voltage-controlled oscillator is provided having a semiconductor integrated circuit and a piezoelectric resonator. A variable-capacitance diode may be connected in series with the piezoelectric resonator. The variable-capacitance diode may be further mounted a land of a lead frame. The piezoelectric resonator, variable-capacitance diode and lead frame may be resin molded into a single unit. In operation, a signal may be applied to a node located between the variable-capacitance diode and the DC-cutting capacitor.

Voltage-controlled oscillator having a semiconductor integrated circuit, a piezoelectrics resonator and a diode and variable-capacitance diode

A voltage-controlled piezoelectric resonator may be implemented without requiring the use of a trimmer capacitor by virtue of the use of a capacitor array with or without an additional capacitor array, thus reducing the number of external parts. The capacitor array and the additional capacitor array can be packaged in an IC, thus enabling reduction in the size of the voltage-controlled piezoelectric resonator. The voltage-controlled piezoelectric resonator incorporating the capacitor array exhibits high stability both in terms of secular change and operation, which in turn ensures high stability of operation of a piezoelectric oscillation circuit incorporating this voltage-controlled piezoelectric resonator. An oscillation center frequency adjusting mechanism produces adjusting data, so that the adjustment of the oscillation center frequency can be effected purely electrically. Since mechanical adjusting operation that is essential in conventional arrangements is unnecessary, the time required for the adjustment of the oscillation center frequency is shortened to allow a reduction in the production cost of the voltage-controlled piezoelectric resonator.

Capacitor array unit connected to oscillation circuit with a piezoelectric reasonator, capacitor array unit controller oscillation frequency adjusting system and oscillation frequency adjusting method

A temperature compensated piezoelectric oscillator includes: an oscillation circuit that drives a piezoelectric element with a current; a direct-current-stopping fixed capacitor; a frequency-temperature compensated circuit that compensates the deviation of an oscillation frequency caused by a change of temperature; and a piezoelectric transducer which includes a piezoelectric element driven in a prescribed frequency; where the above elements are connected serially; wherein the frequency-temperature compensated circuit includes a temperature compensation voltage generation section which generates a voltage based on a parameter that is changed in a temperature detection unit, in which the parameter changes according to the surrounding temperature; wherein the temperature compensation voltage generation section includes: a low-temperature control voltage generation section which generates a voltage that compensates a temperature characteristic of the piezoelectric element in a low temperature, where "low" indicates temperatures lower than a common temperature in the temperature characteristic of the piezoelectric element; and a high-temperature control voltage generation section which generates a voltage that compensates the temperature characteristic of the piezoelectric element in a high temperature, where "high" indicates temperatures higher than a common temperature in the temperature characteristic of the piezoelectric element; wherein the low-temperature control voltage generation section includes: a low-temperature first-degree voltage generation circuit which generates the voltage that linearly changes with temperature; a low-temperature high-degree voltage generation circuit which generates the voltage that behaves like a high degree function in a low temperature state of the voltage generated by the low-temperature first-degree voltage generation circuit; and a low-temperature voltage composite circuit which synthesizes voltages generated by the low-temperature first-degree voltage generation circuit and the low-temperature high-degree voltage generation circuit; and wherein the high-temperature control voltage generation section includes: a high-temperature first-degree voltage generation circuit which generates the voltage that linearly changes with temperature; a high-temperature high-degree voltage generation circuit which generates the voltage that behaves like a high degree function in a high temperature state of the voltage generated by the high-temperature first-degree voltage generation circuit; and a high-temperature voltage composite circuit which synthesizes voltages generated by the high-temperature first-degree voltage generation circuit and the high-temperature high-degree voltage generation circuit.

Temperature-compensated piezoelectric oscillator

The invention provides a piezoelectric oscillator having a reduced horizontal size and capable of being mounted in a small area. The invention also provides a portable telephone and an electronic device using such a piezoelectric oscillator. The piezoelectric oscillator includes a first package and a second package which are firmly connected to each other such that the second package is located on the first package. An oscillator circuit element is disposed in the first package, and a piezoelectric resonator is disposed in the second package. The first package includes a first lead frame and a second lead frame. End parts of the first lead frame are bent downward such that the bent portions at the lower end are exposed to the outside and serve as the first connection terminals. The second lead frame is placed on the first lead frame. End parts of the second lead frame are bent upward so as to serve as second connection terminals. The first connection terminals described above are used as mounting terminals. The second connection terminals are electrically connected to external terminals of the second package.

Piezoelectric oscillator, portable telephone using a piezoelectric oscillator, and electronic device using a piezoelectric oscillator

The invention provides a piezoelectric oscillator including a semiconductor integrated circuit and a piezoelectric resonator or a voltage-controlled oscillator including a semiconductor integrated circuit, a piezoelectric resonator and another electronic component. The piezoelectric resonator has a cross-sectional shape of an ellipse or a track. The semiconductor integrated circuit and the electronic component are molded with a resin into a very thin unit.

Manabu Oka

Papers

Voltage-controlled oscillator having a semiconductor integrated circuit, a piezoelectrics resonator and a diode and variable-capacitance diode

Capacitor array unit connected to oscillation circuit with a piezoelectric reasonator, capacitor array unit controller oscillation frequency adjusting system and oscillation frequency adjusting method

Temperature-compensated piezoelectric oscillator

Piezoelectric oscillator, portable telephone using a piezoelectric oscillator, and electronic device using a piezoelectric oscillator

Piezoelectric oscillator, voltage-controlled oscillator, and production method thereof