Abstract: The penalties associated with relying on layer-4 to handle packets lost as a result of a handoff can be reduced by forwarding, in response to a handoff request from a first base station to a second base station, at least one layer-2 frame of a layer-3 packet destined to/from the wireless terminal that has been passed down from layer-3 to layer-2, and so is indicated to have been transmitted at layer-3 even though not all of the layer-2 frames of the layer-3 packet have actually been transmitted. In one embodiment of the invention, each of the at least one layer-2 frames may be encapsulated together in a special layer-3 packet that is transferred from the first base to the second base station in the usual manner of inter-base-station communication. Advantageously, packets are not lost at layer-4 due to handoffs. Thus, layer-4 retransmissions are not required, and so delays in the network are reduced.

Abstract: A moveable antenna system with a position sensor circuit and a circuit which transmits the position sensing data and the radio frequency (RF) on the same wire. The position sensor comprises a sensing pin and a sense track concentric with the coaxial cable for the RF signal. When the antenna is in the preferred position for transmission, the sensing pin is in contact with the sense track, thus closing a switch, allowing the unit to transmit RF signals. Otherwise, the sensing pin is not in contact with the sense track, preventing any transmission of data. The signal that results from the opening and closing of the switch is carried on the same transmission line as the RF signal. This is accomplished by using capacitors to block direct current (DC) from the transmission line and using resistors and shunt capacitors to prevent any leakage of RF signals onto the sensing circuit.

Abstract: To reduce the number of signal lines in the inside of a radio receiver which determines a reference voltage based on data supplied from an external CPU, the first and second reference value data from the external CPU (1) is supplied to an input section (20) of a PLL control circuit (19), and then latched by a latch circuit (21). The latched data is converted into an analogue reference voltage in D/A converters (23, 24). The reference voltage is transferred to a radio receiving circuit (2) to be supplied to comparison circuits (16, 18) via a single line, respectively, in the inside of the radio receiving circuit (2).

Abstract: A multimode service radio communication apparatus, that provides a hand-held or vehicle-mounted terminal with radio communication and radio broadcasting information of a radio information and communication providing system including mobile communication systems and intelligent transport systems, includes a frequency division multiplexer that integration-converts individual radio or intermediate frequencies modulated for mobile telephones and broadcasts so that the modulated frequencies are included in a specific frequency band, and produces radio signals in the specific frequency band; supply device for supplying the radio signals; an antenna for receiving and transmitting the supplied radio signals; a shared antenna for receiving the transmitted radio signals; and terminals to which specific frequencies in the specific frequency band are selectively linked.

Abstract: A satellite for a satellite telecommunication system transmits signals at different powers on the downlink connection. The powers are chosen to limit the relative dynamic range of signals received on the downlink connection. The relative dynamic range of signals received on the downlink connection is advantageously less than 5 dB and preferably less than 2 dB. A digital processor circuit is used, together with an analog-digital converter, a circuit taking the fast Fourier transform of the converted signals, a circuit for monitoring the gain of the signals, a circuit for switching the signals to at least two amplifier subsystems each including an inverse fast Fourier transform circuit, a digital-analog converter and a power amplifier.

Abstract: There is disclosed a test apparatus for use in a wireless network base station comprising a non-radio unit for processing baseband signals and a radio unit separate from the non-radio unit for transmitting and receiving radio frequency (RF) signals. The test apparatus comprises: 1) a housing; 2) a first connector coupled via a first cable to the radio unit, wherein the first cable comprises signal lines carrying base station signals between the radio unit and the non-radio unit; 3) a second connector coupled via a second cable to the non-radio unit, wherein the second cable comprises signal lines carrying the base station signals between the radio unit and the non-radio unit; and 4) a first access connector that allows a signal measuring device to monitor at least one of the base station signals.

Abstract: A system and method for adjusting satellite communication signal transmit power for signals transmitted to a localized region within a satellite coverage area utilize real-time information on weather conditions (172) and/or actual path losses (174) within the localized regions to adjust the effective isotropic radiated power (EIRP) of the satellite beams (188) to minimize the total radio frequency (RF) power required for transmission. The transmission system may be realized using a variety of antenna types for transmitting spot beams and/or area coverage beams. Representative antenna implementations include multi-beam antennas having a low-level beamforming network and hybrid matrix amplifier system, phased-array with independent input amplitude control and beamsteering for each beam, and a phased-array feeding a confocal imaging system for single broadcast beam per polarization.

Abstract: A telecommunication base station transceiver subsystem that can be easily configured to provide single or multi-carrier frequency service. Capacity is increased and diversity reception is maintained from a single to a dual frequency system without the need for additional antennas. The base station is divided into a main unit and a radio unit such that the radio unit is positioned proximate to the antennas and the main unit is remotely located from the radio unit. Furthermore, a single base station transceiver can provide service via multiple wireless protocols, such as CDMA, TDMA, GSM or Analog. The base station transceiver can also operate on various transmit/receive frequencies as well as variable transmit power settings.

Abstract: An IC for communication includes a single oscillating circuit, which is capable of flexibly dealing with the change of data rate or data processing load, and is produced at a low cost and consumes low electric power. In the IC for communication, a frequency multiplying circuit(61) is inserted between the output of an oscillating circuit(1) and a micro-controller circuit(69), or a frequency dividing circuit(2) is inserted between the oscillating circuit(1) and a data receiving circuit(3). A receiving address is stored in a dual port RAM(16). Further, by controlling a receiving frequency of synchronous codes, battery saving efficiency is increased.

Abstract: In a radio communications network (20) having a plurality of cells (34) employing a plurality of cell site configurations (22, 24, 26, 28, 30, and 32), a computing system (116) and a computer-based method (178) create a hierarchical data structure (136) modeling the radio communications network (20). The hierarchical data structure (136) is created using object oriented programming methodology to create objects, representing the various physical components of a cell site. In addition, objects are created to represent the auxiliary information, such as available channels, channel assignment constraints, carrier-to-interference ratios, and neighbors lists under which a particular radio communications network configuration is devised.

Abstract: A radio communication device (100) such as a mobile telephone comprises signal converters (110, 130, 140), a band-pass filter unit (120) and an oscillator (150). In the receiving mode (I) a first converter (110) converts an HF signal into an intermediate ZF signal (20) which, upon filtering by the band-pass filter unit (120), is converted into an NF signal by means of a second converter (130). In the transmission mode (II), the device (100) employs the first converter (110) and the filter (120) for compression of the dynamic range of a microphone signal (40). The first converter (110) converts the microphone signal (40) into a further intermediate ZF signal (50) which is subjected to amplitude limitation by means of a limiter circuit (121) in the filter unit (120) and filtered by means of a filter (122). The third converter (140) converts the filtered and limited signal (51, 52) again into a low-frequency signal (60).

Abstract: A mobile communication handset which is configured for communicating by a cellular or PCS or cordless call over a first wireless link to a base station, and is also configured for communicating with one or more other communication devices over other respective wireless direct device-to-device second links implemented by the Bluetooth Intercom Profile, is provided with functionality to carry on a group call by appropriately combining speech signals carried by the various links and by the handset. The first wireless link may be a cordless link which is implemented by the Bluetooth Telephony Profile. Alternatively, the first link may also be configured as wireless direct device-to-device link, in which case all wireless links involved in the group call are implemented by the Bluetooth Intercom Profile.

Abstract: A communications satellite (201) has an on-board high speed packet switch for switching transmitted data packets. The packet switch (502) is part of a processor subsystem (501) which also includes a number of demodulators (5031 to 503n) demodulating signals received from an uplink downconverter. All of the processors in the processor subsystem (501) are organized into a loosely coupled, distributed, architecture of general purpose computer modules (601) and digital signal processor modules (602) having both primary and redundant processors and being connected to each other by dual redundant PCI buses. Software and firmware is layered and distributed redundantly over the processor modules (601, 602).

Abstract: A method and apparatus for reducing power consumption of a receiver of a communications device that does not change the global hardware of the device and uses the current master clock to lower the clock frequency. In an example embodiment, a method directed to reducing power consumption of a receiver of a communications device during an idle state. The receiver has an internal power source and a corresponding base unit. The method includes generating a clock signal that has an output frequency that varies, the frequency being higher in an active state and lower in an inactive state, such that the receiver consumes more power during the active state then when in the inactive state. Power consumption by the receiver is reduced by dynamically and synchronously switching the clock frequency to a lower clock frequency. Receiver power consumption is a function of the power consumed during the active and inactive states and the duration of the idle state.

Abstract: A system and method are disclosed for monitoring the quality of a broadcast. A broadcast signal is received at a receiver and the power of the received signal in a carrier band is measured. The power of the received signal in a sideband is also measured. A time is determined at which the ratio of the power of the received signal in the carrier band to the power of the received signal in the sideband is indicative of a carrier to noise ratio of the received signal at the receiver and the carrier to noise ratio of the received signal is stored at the receiver.

Abstract: The invention relates to a cellular radio system and a method of locating a terminal in a cellular radio system having in each cell at least one base station 104 communicating with the terminals 100 within its area. The base station measures channel parameters from the signals transmitted by the terminals. The coverage area of each base station is modelled by a digital map. To enable accurate localization of the terminals, to each point on the digital map is added a model of the channel parameters of a signal to be transmitted from the point. The channel parameters estimated from the signal of the terminal are compared with the parameters at different points on the map, and the terminal is located on the basis of the comparison.

Abstract: An RF-type amplification system, such as a classroom amplification system, employs technology adapted from a cordless telephone system to overcome interference. The amplification system includes a portable remote unit (87) and a base unit (82). Remote unit (87) includes: a microphone (151) for detecting a voice and generating corresponding voice signals; a transmitter (160, 161) which generates RF signals containing the voice signals as well as control signals provided by the central processing unit (179) of remote unit (87), and an antenna (168) for transmitting the RF signals and for receiving RF signals from base unit (82). Base unit (82) includes an antenna (107) which receives the RF signals transmitted by the remote unit and a receiver (108, 114, 115, 117) which detects the RF signals and separates the RF signals into the voice signals and control signals. The control signals are identified by a code detector (118) of base unit (82) and evaluated by a CPU (130).

Abstract: A method and system for sending information to a pager regarding information pertaining to a previously occurring telephone call. After receiving a call offered to a called party, a signal is transmitted from a switch to a service control point, which then obtains transmitted information relating to the call. A signal is transmitted from a service control point to a switch to instruct the switch to process the call. Another signal including the information relating to the call is transmitted preferably from the service control point to a service node and then to a communications service provider. The communications service provider is preferably a paging service provider which transmits a page including the information relating to the call to a pager associated with the called party. The information relating to the call then may be displayed on the pager.

Abstract: Interruption phases are inserted in a UMTS transmission in order to monitor GSM base stations. In order to reduce the number of these interruption phases, a message is transmitted from the mobile station to the UMTS base station after receiving information which is sufficient for the adjacent channel search, in order to influence or restrict the insertion of further interruption phases.

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).