Abstract: A communications system having a base station and a handset, capable of communicating over a base set of communication channels. Selecting one of the base channels for establishing communication. The handset sending a message, informing the base station, if it is capable of communicating over any extended set of communication channels, beyond the base set of channels, and if so, where the extended set of channels are located. The base station sends a message to the handset, informing the handset whether the base station has extended channel capability. If the base station has extended channel capability, the handset tunes its front end filters to match the indicated spectrum from the base station.

Abstract: The method includes receiving (404) by a first base station (212) a signal (215) transmitted from the mobile station (216); demodulating (406) the signal by the first base station (212) to form a demodulated signal; remodulating (408) at least a portion of the demodulated signal to form a reference signal; receiving (412) by the first base station (212) and a second base station (210, 214) a retransmitted signal (217); comparing (414, 16), by the first base station (212), the retransmitted signal (217) with the reference signal to determine a first delay; comparing (414, 416), by the second base station (210, 214), the retransmitted second signal (217) with the reference signal to determine a second delay; and based on the first and second delays, determining (420) a location of the mobile station (216).

Abstract: The apparatus includes a cover (10) having a first surface (12) and a second surface (14) opposed to the first surface (12). The second surface (14) has an edge (16) defining a perimeter and has a recessed region (18). A wall (20) is in communication with the recessed region (18), the wall (20) and at least a portion of the edge (16) define a compartment (22). An electromagnetic interference-attenuating material (24) is disposed in the compartment (22), and a fluid distributing manifold (26) is disposed in the cover (10). A nozzle housing (30) sized to receive a nozzle is located in the fluid distributing manifold (26). The nozzle housing (30) has a receptacle end (32) and a spray end (34). The spray end (34) has an aperture (36) in communication with the compartment (22) and the receptacle end (32) is in communication with the fluid distributing manifold (26).

Abstract: A radio communication system (100) employs a method (300) and apparatus (103) for providing chronological information to a communication unit (103). A base site (101) of the radio communication system (100) determines (303) the chronological information (e.g., time and date). The base site (101) transmits (305) the chronological information in a portion of a system control signal (107) to the communication unit (103). The communication unit (103) receives (311) the chronological information and maintains (313) the chronological information for use (315, 317) by a user of the communication unit (103).

Abstract: A wireless communication system for simultaneously communicating overlapping wideband and narrowband signals. The system includes a transmitting station for embedding one or more narrowband signals (3-5) in a wideband signal (1) having a frequency spectrum encompassing the narrowband signals, and transmitting the resulting composite wideband signal (2). The system also includes a receiving station for receiving a composite wideband signal (60) and separating the embedded narrowband signal(s) (62, 63) from the wideband signal (61). In one embodiment, a cellular radiotelephone base station (35) is operable as both the transmitting and receiving station, communicating with remote subscriber units (29-31) having conventional transceivers (FDMA, TDMA and/or CDMA).

Abstract: A method of synchronizing a fixed access unit (16) into a time division multiple access (TDMA) system (10). The method includes the steps of receiving a first timing advance channel time slot (86) at the fixed access unit (16), sending a message advanced in time by an offset value over a second time slot (88), receiving an acknowledgment from the TDMA system (10) that the message was received, and advancing a subsequently transmitted communication based on the offset value.

Abstract: A mobile radio for operation in a system includes a plurality of mobile radios, in which each mobile radio transmits, selectively, traffic frames containing traffic data responsive to inputting of information to the mobile radio when the mobile radio is in an active transmit state of operation, and silence descriptor frames responsive to absence of input information when the mobile radio is in active transmit state of operation. The mobile radio includes: a transmitter for transmitting traffic on a radio channel; a receiver for monitoring signals on the radio channel; a control input for inputting a transmit command; a controller, responsive to the receiver and responsive to the control input, for controlling the transmitter, where the controller is arranged to enable activation of the transmitter, when the receiver detects continuous silence descriptor frames on the radio channel for a predetermined duration and a transmit channel command is input at the control input.

Abstract: The present invention provides a method of allocating communication resources in a communication system. The method includes retrieving from the communication system the present communication system resource allocation (402); identifying for a tuning cell allocated communication resources which do not satisfy the allocation criteria (410); identifying candidate communication resources within the communication system which satisfy the allocation criteria (416); allocating the candidate communication resources to the cell (424); repeating these steps for each cell marked for retuning (404) and downloading the new communication system resource allocation to the communication system (406).

Abstract: The apparatus for testing electrical switch matrices includes a potential selector (30) for receiving and applying a voltage (28) to a predetermined input (101-106) of each of the plurality of electrical switches (12), a controller (15) for receiving and applying signals to the plurality of electrical switches (12), and a combiner (36) responsive to an output (22) of each of the plurality of electrical switches (12). The controller (15) selects electrical paths (16) associated with each of the switches (12) which are in communication with the predetermined inputs (101-106) of each of the switches. The output (38) of the combiner (36) indicates whether at least one of the selected electrical paths (16) failed.

Abstract: A method of transferring a user message-conveying radiotelephone call by a subscriber unit from a first radio coverage area, served by a first fixed control unit which is coupled to a wireline telephone switch, to a second radio coverage area served by a second fixed control unit, includes transmitting a directory number, associated with the first fixed control unit and the wireline telephone switch, the directory number identifying a wireline telephone number of the first fixed control unit, from the first fixed control unit to the subscriber unit; storing the transmitted directory number at the subscriber unit; transmitting the stored directory number from the subscriber unit to the second fixed control unit when a need for transfer of the radiotelephone call to the second fixed control unit from the first fixed control unit is determined; calling the transmitted directory number from the second fixed control unit; in response to the calling of the directory number, connecting the second fixed control unit

Abstract: A method is disclosed of reducing data loss during cellular handoff of a mobile among base sites by detecting an end-of-line signal by a fax adapter (13a or 106a) from the transmitting fax, buffering (13b or 106b) subsequent fax information, and transmitting filler bits in place of the EOL and buffered information.

Abstract: A method and apparatus of displaying performance metrics of a cellular communication system (50) having a call routing element (51), control elements (55, 56, 57, 58) and transceiver elements (59, 60, 61, 62, 63) provides for creating a hierarchical display (10) of the call routing element, the control elements and the plurality of transceiver elements with the call routing element depicted at a center of the hierarchical display and the control elements and transceiver elements radiating outwardly from the center in a hierarchical order. The user or the system selects a performance metric of one of the call routing element, the control elements and the transceiver elements, and the selected performance metric is displayed for each of the call routing element, the control element and the transceiver elements within the hierarchical display.

Abstract: The method includes loading a printed circuit board (PCB) to a printing machine; aligning a stencil to the PCB when the PCB has been loaded to the printing machine; setting a snap-off distance; dispensing a volume of solder paste onto the stencil, the volume of solder paste being dispensed onto the stencil regardless of whether the PCB has been loaded to the printing machine; placing a squeegee in contact with the stencil at a predetermined pressure; moving the squeegee across the stencil at a predetermined speed; waiting a constant period of time; and repeating.

Abstract: The present invention provides a method of handing off a communication unit in a cellular communication system. The method includes communicating initialization frame data from a target cell transceiver to a base site transcoder; establishing communication between the target cell transceiver and the communication unit; terminating transmission of initialization frame data; communicating ordinary frame data received by the target cell transceiver from the communication unit to the base site transcoder; and handing off the communication unit to the target cell transceiver upon detecting a transition from initialization frame data to ordinary frame data at the base site transcoder.

Abstract: A method and apparatus are provided for echo canceling which includes double-talk immunity. The echo canceller (15) according to the present invention includes a double-talk detector (17) which uses an adaptive double-talk detection threshold (214) and an accurate estimation of reference energy (106) to detect double-talk. The echo canceller further provides for correcting partial echo canceller adaptive filter vector divergence occurring prior to double-talk detection by maintaining and switching to an auxiliary echo canceller filter with known "good" filter coefficients (58, 60, 62).