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: The method operates in a wireless code division multiple access (CDMA) communication system (10) which includes a fixed communication unit (114). The fixed communication unit has a plurality of paging channels (230, 235) and a plurality of traffic channels (245, 247). A mobile communication unit (320) is responsive to the fixed communication unit via an active paging channel of the plurality of paging channels. The method includes selecting a paging channel of the plurality of paging channels over which to transmit the message to form a selected paging channel (410); transmitting a preliminary message via each of the plurality of paging channels (415), the preliminary message comprising the selected paging channel; and transmitting the message over the selected paging channel (425), the mobile communication unit receiving the message over the selected paging channel while continuing to monitor the active paging channel.

Abstract: A received ATM layer OAM cell processing apparatus for processing in real time a fault management cell among ATM layer OAM cells of F4/F5 levels applied to a user network interface and a network node interface and performing CRC-10 and CRC-32 operations with respect to the other ATM layer OAM cells such as activation/deactivation cells, a resource management cell, a system management cell and a meta signaling cell, not processed in real time. Further, the received ATM layer OAM cell processing apparatus processes in real time a performance management cell among the ATM layer OAM cells of F4/F5 levels applied to the user network interface and network node interface.

Abstract: Disclosed is an adaptive connection admission control method by traffic measurement and estimation, which includes the steps of determining whether a connection is to be accepted or not by using the peak cell rate among the user-declared traffic parameters and the estimation value of the average cell rate of individual connections under service as inputs when a connection set-up request signal is inputted into the system, the step of reducing the number of connections when a connection release request signal is inputted, and the step of calculating the measured value of the average cell rate of all the connections passing through an output link and the estimated value of the average cell rate of individual connections when the measuring interval has ended, to thereby accomplish accurate and smooth connection controls.

Abstract: In a network node having a host system coupled to a network by an adapter, VC-specific congestion is detected and reported to the host system. The host memory includes rx slots or buffers, each corresponding to one of one or more supported slot types. Per-VC slots consumed counters are maintained to count slot consumption for each active VC. Free buffer FIFOs are maintained for each of the one or more slot types, which have a predetermined congestion threshold associated therewith. Entries in each free buffer FIFO correspond to an rx slot posted by the host system. When a new rx slot or buffer in host memory is to be allocated to an incoming cell received on a given VC, the slots consumed counter is compared to the predetermined congestion threshold. If they are equal, the VC is at threshold level and the incoming cell is discarded and a report is sent to the host system.

Abstract: A method of communicating between radio units (10, 11, 12, 13) by transferring cells over a communication channel having repeating frames. A matrix (200) of frame positions is maintained, where a first dimension (X) of the matrix corresponds to positions in a frame and a second dimension (Y) corresponds to frames in a sequence of frames. A value (P) is associating with each frame position, representative of a minimum repeat number. A cell is allocated to a position in a frame and the cell allocation is repeated every Nth frame where N is an integer multiple of the repeat number (P). In another embodiment, a cell is transmitted at the selected position in the frame and an indicator is included in the transmitted cell, where the indicator represents an integer value N. Subsequent cells are transmitted at the selected position every Nth frame.

Abstract: A rearrangeable non-blocking three stage network and method for routing one or more requests between an input stage and an output stage, comprising between 3N and substantially the next largest integer of (41N-E.sub.N)/16 center stage interconnection units, where N is the greater of the inlet links to the input stage and outlet links from the output stage. Received requests are grouped by load size into a first group, a second group, and a third group with the second ground divided into a first half and a second half. The requests in the first group and first half of the second group are routed by a first set of center interconnection units, and the requests of the second half of the second group are routed by a second set of center interconnection units. The requests of the third group are routed through the first and second set of interconnection units so long as their load capacity is not exceeded, while any remaining small requests are routed through a third set of interconnection units.

Abstract: A system and method for encoding and transmitting data with a spread-spectrum packet-switched system. Data to be transmitted by a packet transmitter are encoded for privacy and to restrict intelligent receipt of the data to the intended recipient. The encoded data is demultiplexed into sub-data-sequence signals which are spread-spectrum processed and then combined as a multichannel spread-spectrum signal. The multichannel spread-spectrum signal is concatenated with a header to output a packet-spread-spectrum signal which is transmitted over radio waves to a packet receiver. The packet receiver obtains timing for the multichannel spread-spectrum signal from the header. The multichannel spread-spectrum signal is then despread and multiplexed as received-encoded data. The received-encoded data is decoded by the intended recipient and stored in a receiver memory for output.

Abstract: A method of fairly and efficiently scheduling transmission of a packet from a plurality of sessions onto a network is presented. The method includes providing an input having a plurality of sessions, grouping the sessions into a plurality of classes, scheduling the classes with first level schedulers associated with one of the classes, scheduling the outputs of some of the first level schedulers with a second level scheduler, and prioritizing among the output of the remaining first level scheduler(s) and the output of the second level scheduler to provide an hierarchical scheduler output. The scheduler accepts traffic types at its input, and provides an output suitable for scheduling cell based traffic such as Asynchronous Transfer Mode (ATM) network traffic.

Abstract: A digital message switching system includes at least one digital message switching unit and a plurality of subordinate units each being coupled to the respective switching unit through a respective transmission link. In order to signal a request of a subordinate unit to transmit, that unit first sends at least one message of meaningless content to a higher-ranking unit and only then sends messages of meaningful content.

Abstract: A cell receiver includes, in addition to a cell decomposing unit, an interleaving memory, an error correcting unit, a FIFO memory, and a delay fluctuation absorption control unit, a delay fluctuation absorption buffer for absorbing delay fluctuation of a received cell, and a buffer control unit for controlling a read operation of a cell from the delay fluctuation absorption buffer. Since the delay fluctuation of a received cell is absorbed by the delay fluctuation absorption buffer, the number of memories necessary for interleaving can by reduced to two memories.

Abstract: The demodulation of data modulated on a set of carriers with equidistant frequencies by a plurality of transmitters (T1 . . . Tn) is executed in the present transmission system (TS) by a discrete multitone receiver (DMT-R). The transmitters (T1 . . . Tn) in the transmission system (TS) modulate their data on subsets of carriers which form part of the set of carriers with equidistant frequencies. These transmitters (T1 . . . Tn) are possibly additionally equipped with a cyclic prefix adder (CPA); synchronization between them is guaranteed if a predefined condition is fulfilled.

Abstract: A low cost solution for providing wireless multi-rate packet data communications between a transmitting unit and a receiving unit on a single spread spectrum channel. The transmitting unit and receiving unit are operable to change communications modes at any given time to provide packet data communications at any given data rate for any given duration. In general, the transmitting unit is operable to change the coding gain of the transmitted spread spectrum to establish a communications mode providing a given data rate for communication to the receiving unit. In one embodiment, the transmitting unit first establishes a regular communications mode, wherein the transmitting unit generates a spread spectrum packet data signal having a high coding gain, thus providing low rate, highly reliable communications over the channel.

Abstract: A multiplexed network connecting apparatus comprising, communication lines for connecting in parallel a pair of LANs, relay stations each interposed between each of the communication lines and each of the LANs, transmission means for transmitting a transmission frame from a first LAN of the LANs to a second LAN, and bypass transmission paths each for connecting the relay stations. One of the first relay stations connected to the first LAN, which is designated as an operation system relay station, receives the transmission frame from the first LAN, transfers the transmission frame to the second LAN through the communication line connected to the operation system relay station, and transfers the transmission frame to another of the first relay stations, which is designated as a standby system relay station, through the bypass transmission path when the communication line connected to the operation system relay station malfunctions.

Abstract: A system and method are provided for multiplexing/demultiplexing asynchros high-speed digital data and asynchronous low-speed digital data. A first digital signal processor (DSP) receives complete low-speed data messages and is programmed to assemble each complete message into data blocks in accordance with a block format. Each data block is identical in size and includes provisions for a header that identifies the data assembled therein. A second DSP has a plurality of I/O ports, each of which has a direct memory access (DMA) associated therewith. One of the I/O ports is coupled to the first DSP to receive each complete message assembled into data blocks. The other I/O ports are coupled to a second plurality of channels transmitting asynchronous high-speed digital data. The DMAs associated with the other I/O ports are configured to assemble the high-speed data into data blocks in accordance with the same block format used for the low-speed messages.

Abstract: An asynchronous multiport controlling technique in a single processor of a remote security administration system, for example, including a scanning unit, a VAN (value added network) main unit, an X.25 interface module, and a VAN interface module to perform the asynchronous multiport communication with the VAN main unit, in which the asynchronous multiport controlling technique is carried out by collecting extracted VAN-related data from the X.25 interface module, searching out a transmitting port after collecting the VAN-related data, checking to determine whether or not the searched transmitting port is in normal state, generating a suitable request frame for a prescribed format when the transmitting port is in its normal state to transmit the request frame to the VAN main unit via the searched port, and receiving a result frame as many as the allotted number of ports after transmitting the request frame to store the result frame in a single buffer.

Abstract: In a radio communication system for performing digital radio communications by using time-division multiplexed time slots, a first personal station receives its user's speech through the microphone, converts it into audio data, and transmits them on time slots to a second personal station. On the other hand, the first personal station receives non-audio data from the data processor connected with the second personal station and stores. When the audio data amount inputted to the first personal station in a unit time period is lower than a threshold and the communications between the first personal station and the second personal station are put in a silence condition, the first personal station transmits non-audio data on times slots to the second personal station. When the communications return to a sound condition, audio data transmission is restored. Whether each time slot carries audio data or non-audio data is designated by an identifier which is written in a predetermined field of each time slot.

Abstract: A packet communication system is capable of rapidly carrying out receipt confirmation for transmission of a downward packet signal. When a radio base station (100) wishes to obtain from a terminal (101) response information indicating that the terminal has received a downward packet signal, the radio base station temporarily inhibits a terminal (102) from transmitting an upward packet signal so as to enable the terminal to transmit as an upward packet signal a packet signal containing the response information.

Abstract: A technique for packet-switching suitable for interference-limited wireless communication systems is provided. Long bursty packets of data are broken into shorter units or packet-slots. This advantageously provides for averaging and minimizing interference in time--one of the requirements for achieving high system capacity in interference-limited systems. Transmit-start times and durations of packet slots are controlled by packet-slot distribution patterns. The patterns are representable by unipolar binary codes/sequences whose properties are based on number-theoretic principles. The technique minimizes the time variance of composite interference due to simultaneous transmissions of numerous signals over the same frequency channel. By minimizing the variance of overall interference, this technique satisfies the demand of multi-media traffic and also increases system capacity in a fading multipath environment.

Abstract: A communication device (e.g., 106) having multiple transmission modes employs a method of transmitting user information (309, 310) and intermittent overhead data (307, 308). The communication device (106) selects from a first transmission technique and a second transmission technique. When the first transmission technique is selected and overhead data (307) is to be transmitted, the communication device (106) replaces a first predetermined amount of the user information (309) with the overhead data (307) to form a data unit. When the second transmission technique is selected and overhead data (308) is to be transmitted, the communication device (106) replaces a second predetermined amount of the user information (310) with the overhead data (308) to form the data unit, wherein the second predetermined amount is less than the first predetermined amount.