Abstract: A private communication network through which a plurality of member users communicate using the public switched telephone network (PSTN) is disclosed herein. Each member user utilizes either a modified land line telephone directly connected to PSTN, or uses a modified mobile telephone operatively coupled to the PSTN through a wireless communication system. The private communication network includes network call manager having a telephone network interface for establishing a telephone connection with each of a plurality of telephone lines of the PSTN. Each of the plurality of telephone lines is associated with one of the plurality of member users. The network call manager further includes a switch matrix, coupled to the telephone network interface, for providing an information signal received from an active member user over a selected telephone line to the remaining non-active member users.

Abstract: A method and apparatus for the selection of an encoding mode for speech frames in a variable rate encoding system. For each speech frame, the method and apparatus selects the encoding mode which provides for rate efficient coding. A mode measurement element receives a speech signal and a signal derived from the same speech signal, and generates a set of parameters which are ideally suited for operational mode selection. Rate determination logic receives the set of parameters and selects an encoding rate using predetermined selection rules. The selection rules further distinguish between unvoiced speech and temporally masked speech, which are encoded at the same rate but with different encoding strategies.

Abstract: An receiver receives, amplifies, filters, and downconverts an RF signal to obtain an FM signal. The FM signal is then limited by a limiter and sampled by an ADC. The FM samples from the ADC are provided to an edge detector which detects transitions in the FM samples. The transitions correspond to zero crossings in the FM signal. The time period between the zero crossings, or the cycle width, is measured with a counter to determine the instantaneous frequency f.sub.c of the FM signal. The demodulated output is proportional to the instantaneous frequency which can be determined from the measured cycle periods as f.sub.c =1/2T.sub.c, f.sub.c .apprxeq.-.alpha.T.sub.c, or f.sub.c .varies.T.sub.c, where T.sub.c is the measured cycle period, and .alpha. is a constant based on the slope of 1/2T.sub.c,avg, where T.sub.c,avg is the average cycle period. The sample rate of the demodulated output can be reduced, through resampling, to minimize power consumption in the subsequent signal processing blocks.

Abstract: A novel and improved method and apparatus for generating a constant data rate channel supporting signaling data transmission in an adjustable rate wireless communication system is described. In accordance with one aspect of the invention the rate at which the channel operates may be adjusted based on the particular use and environmental conditions such that the appropriate data rate up to a maximum capability can be achieved. User data is then placed into frames based on the selected rate. When available, signaling data is added into each frames in a predetermined amount. The resulting frame is encoded, repeated and punctured based on the selected rate and whether signaling data has been introduced, and transmitted via RF signals to the receive system. Upon reception, the frame is processed in accordance with having only user data and with having signaling data. That is, the frame is processed both as if it had signaling data and as if no signaling data were present.

Abstract: A ROM circuit that can be modified via the alteration of any one of a set of substance layers is described. The ROM circuit includes a set of ROM cells each of which provide one bit of data used to construct the fixed binary number. Each ROM cell includes a set of circuits that can be placed in either a first or second state via modification of a single substance layer that is different for each circuit, and generates a signal in a logic state that depends on whether the number of circuits in the first state is odd or even. When a design revision occurs the state of one of the circuits from the set of circuits is modified to update the fixed binary number using one of the substance layer already being modified during the course of the design revision.

Abstract: A novel and improved method and apparatus for signal acquisition in a wireless telecommunication system having large transmission delay uncertainty is described. A terminal first acquires the forward link signal from a hub and extracts timing information from that forward link signal. Using the timing information the terminal estimates the time at which a next search window takes place during an access slot, and the time and pseudorandom code state necessary to transmit an access probe so as to arrive at during the search window assuming the terminal is located a maximum distance from the hub. The terminal proceeds to transmit additional access probes at times occurring one access slot period plus a delta time interval after the previous transmission. The delta time interval has a duration less than that of a search window associated with each access slot.

Abstract: When one vocoding system is coupled to another vocoding system, a tandem arrangement results. The tandem configuration results in voice quality degradation as speech is encoded and decoded, then encoded and decoded again. One reason for the degradation is that postfiltering performed at the output of the speech decoding process introduces distortions in the spectral content of the reconstructed speech as compared to the original speech. The present invention prevents the degradation due to the use of postfilters by modifying the postfiltering within the vocoders where a tandem configuration exists. A detection code is embedded within the data signal to indicate the existence of a tandem configuration. If the detection code is received at a vocoder, modified vocoding is established within the vocoders to prevent the degradation due to the postfiltering.

Abstract: The present invention is a method and apparatus for providing a received signal quality metric which is optimally designed to control the transmission power of a transmitter in a closed loop power control system. The present invention is described in the context of a spread spectrum communication system but it is equally applicable to other types of communication systems. In the present invention, the power control system is described for controlling the power of transmissions from a base station to a mobile station, referred to as forward link transmissions.

Abstract: A data communication system which enables an electronic accessory, such as a computer, to communicate data in both an analog type radiotelephone system and a digital type radiotelephone system. The data communication system first determines in which type of system it is operating and the dual mode radiotelephone (101) then uses the data signal at either the analog input port (104) or the digital input port (105), depending on the type of system.

Abstract: A system and method for network management, including a message handling process, having a network manager and at least one network element is described. The network management messaging system sends and receives multiple concurrent messages between the network element layer and the network management layer. Support of concurrent messaging greatly speeds and simplifies network management. A client request is received at a first managed object, at least part of the client request is fulfilled by a second managed object. A major row is created in response to receiving the client request, and a minor row associated with a managed object request sent to the second managed object. The minor row has an index that associates the minor row with the major row, and correlates a response to the managed object request with the client request.

Abstract: A subchannel within a CDMA signal is provided together with a system for receiving and decoding this subchannel. A message is transmitted over the subchannel by applying a sequence of phase rotations to the user data. A single subchannel message can be transmitted during each 1.25 ms segment of user data, resulting in a transmission rates of up to 800 messages per second over the subchannel. Each message corresponds to a fixed sequence of phases, called a phase codeword, used to rotate the user data each time that message is sent. When only two phase codewords are used, the effective data rate for the subchannel is 800 bits per second, but higher data rates may be achieved by increasing the number of codewords used by the subchannel. The subchannel may be decoded by correlating the user data with each of the possible phase codewords.

Abstract: A support fixture for supporting a face plate and CCA board as they are secured together has a base plate and a pair of end supports or blocks projecting upwardly from opposite ends of the base plate to support opposite ends of the face plate. A center support also projects upwardly from the base plate at a location spaced centrally between the two end supports for supporting a central region of the face plate. The end supports have rectangular recesses at the same height as the center support for receiving the opposite ends of the face plate. The height of the recesses and center support is selected to be greater than the height of any LED projecting from the CCA board through openings in the face plate, such that any such LED is spaced above the base plate.

Abstract: In a mobile communication system comprising at least two base stations coupled to a common base station controller, each base station with which a particular mobile station is communicating sends its received frame quality message to the common base station controller. The base station controller combines the received messages to provide an improved estimate of the correct message and thus a correct power level for the forward link signal. Each base station preferably responds independently to error messages it receives from the mobile station and also sends the error message to the base station controller. After receiving power control commands from the base station controller, the base station then determines whether it responded properly at the time when it received the error message from the mobile station.

Abstract: A novel and improved method and apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line fax machines is disclosed. During a telephone call, a fax detector monitors the incoming data for fax signals. If a fax is detected, the data processor switches from processing the data as if it were voice to processing it as fax. In addition, the remote station is sent a signal notifying it to process the data as fax rather than voice. The fax detector operates by detecting the preamble of a V.21 message, present at the beginning of every fax call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing these energies and locating a specific pattern which repeats itself a sufficient number of times.

Abstract: A concentrated subscriber wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices. The metering system comprises at least one powerline remote metering device which collects and forwards telemetry data to an associated wireless remote telemetry device. The wireless remote telemetry device relays the telemetry data to a central controller over existing wireless communication systems, such as cellular base stations, using existing communication standards. The wireless remote metering device transmits various messages over a shared random access channel to the central controller. The central controller transmits messages to the wireless remote metering unit over a paging channel. The wireless remote metering unit may operate in a half-duplex mode only.

Abstract: An HLR Interface Facility (HIF) is disclosed which is disposed between the HLR and the different customer service data bases. The HIF resolves the two problems associated with the single HLR solution. It provides controlled access to the HLR, preventing secondary service providers from accessing or modifying each other's subscriber records.The HIF also offers interworking facilities, allowing to independently modify the interface into the HLR, and the new interface point between different customer service data bases and the HIF. Therefore, if a new feature is introduced in the MSC and only some of the secondary service providers wish to make use of it, only the interfaces between their customer service data bases and the HIF need modification while the other resellers need not change their own interfaces to the HIF.In addition, a means for interfacing the billing output of the MSC to the multiple billing centers is disclosed.