Abstract: An ATM cell processing apparatus including a DRAM for a frame producing buffer of a frame producing unit. In order to absorb the anisotropy of the access rate of the DRAM access, the random access mode of the DRAM access is always used. To compensate a drop in access rate in this case, the DRAM is arranged is an array form and each cell is divided. Resultant partial cell data are written into and read from respective DRAM banks in order. As a result, a fast cell buffer having a large capacity can be formed. The present cell buffer can be applied to a FIFO and the like as well.

Abstract: A plurality of web servers (16, 18, and 20) have a common host name, and their authoritative domain server (24 or 26) responds to requests from a local domain-name server (22) for the network address corresponding to their common host name by making an estimate of the performance costs of adding a further client to each of the web servers and then sending the local domain-name server (22) the network address of the server to which the addition of a further client will result in the least performance cost. The performance cost is defined as the difference in the average number of waiting clients, and it takes into account both the additional response time for existing clients and the projected response time for the prospective new client.

Abstract: A method, system, and associated program code and data structures are provided for a message processing system in which messages are transmitted from source nodes to destination nodes. An “eager” rendezvous transmission mode is disclosed in which early arrival buffering is provided at message destination nodes for a predetermined amount of data for each of a predetermined number of incoming messages. Relying on the presence of the early arrival buffering at a message destination node, a message source node can send a corresponding amount of message data to the destination node along with control information in an initial transmission. Any remaining message data is sent only upon receipt by the source node of an acknowledgement from the destination node indicating that the destination node is prepared to receive any remaining data.

Abstract: An effective communications system for assuring compatibility between new and existing networking technologies is described which may be utilized to prevent the use of trial and error techniques in the establishing of the best possible connection between a calling terminal or modem and a destination terminal or modem. An enhanced services platform is provided which establishes the connection based on the signaling capabilities of both the calling and destination terminal, provides for in-call modification, and provides for call teardown.

Abstract: Enhanced Internet service is provided over an ISDN line by eliminating from the D-channel any packets that will introduce unacceptable delay in packets transmitted over the B-channel. The enhancement is achieved by segregating the packets between the B-channels and the D-channel based on the stream to which the packets belong. Furthermore, instead of bonding together both B-channels and the D-channel, only the B-channels may be bonded to each other, while the D-channel is kept independent. To do so, instead of using MLPPP over the combination of both B-channels and the D-channel, as in the prior art, MLPPP is used over only both B-channels, while data that is separately directed to the D-channel employs another protocol, e.g., PPP. Advantageously, the number of protocols used to transmit the information over the D-channel may be reduced, resulting in a higher bandwidth for applications. The bandwidth of the D-channel can be dynamically throttled by an access server.

Abstract: A method and apparatus for achieving tandem free operation (TFO) including bypass transcoding and cross transcoding in a communication system. The present invention provides communication of compressed voice signals, or voice signals compressed in a common format, between wireless mobile stations across a PSTN by bypassing vocoders residing in the MSC/BSC of the communication system, or between network elements of an ATM network. In a wireless network, a capability signal, preferably being a low frequency tone, is transmitted by the terminating MSC/BSC to the originating MSC/BSC to indicate that the terminating element is capable of transcoding or transcoding and cross transcoding. The originating element responsively generates an optional LF tone and a 2100 Hz tone to disable network cancellers between the originating element and the terminating element in the forward direction.

Abstract: An integrated multiport switch (IMS) for a data network has a management port for direct communication with an external management agent. The switch, which is integrated into a single chip, includes a management interface that comprises logic circuit elements. This interface acts as a virtual physical layer for both the media access controller (MAC) at the management port and the MAC at the external management agent. The latter may be located on the same circuit board as the IMS chip. PHY devices for these MACs are eliminated while the collision signal and carrier sense signal generation functions are maintained. The PHY devices are replaced by a logic interface while permitting use of the standard Simplified Network Management Protocol (SNMP) software for the interfacing operations. No modification of MAC software is required.

Abstract: A queue length measurement device that is comprised of a number of queues that are capable of holding data cells. A differential counter is coupled to each queue. The counter is incremented when a cell is written into the queue and decremented when a cell is read from the queue. An interval measurement device, coupled to the differential counter, generates a pulse to reset the counter at fixed intervals equivalent to n cells time (where n is the maximum number of cells the queue counter can measure). A multiplexer is coupled to the multiple differential counters. A transfer control circuit coupled to the interval measurement device selects the appropriate queue measurement to be output from the multiplexer to the other switch elements. A system and methodology provide for queue flow statistics and closed loop control of cell flow into the queue.

Abstract: This invention applies to a mobile station that is able to determine a required data rate based on data buffer usage. If the data buffer indicates a requirement for a high data rate transmission, the mobile station sends a request to a base station to be assigned multiple parallel code channels. If the multiple parallel code channels are granted, the mobile station uses the channels for transmitting data to the base station until either the data buffer becomes empty, or a base station time-out occurs, or the mobile station is signalled by the base station to reduce its data transmission rate, whichever occurs first. The mobile station of this invention is enabled to autonomously control the data rate during an assigned period for high speed transmission, so as to lower the data rate when needed for the purpose of improving coverage and/or to avoid operating in a power limited condition, thereby degrading link quality.

Abstract: A method for transmitting data from each of n transmitting devices (1) to (n) is provided. According to this method, the data is transmitted with each of a plurality of transmission cycles being one group. Each of the plurality of transmission cycles includes a transmission unit and a first transmission rest period, and the transmission unit includes at least n transmission periods and at least (n-1) second transmission rest periods. The transmission periods and the second transmission rest periods are alternately repeated. The method includes the step of transmitting send data and determination data for determining whether or not two given transmission periods belong to an identical transmission cycle during each of the at least n transmission periods, where n is a positive integer.

Abstract: The present invention comprises a remote terminal (20) and a central office (30) as part of and ADSL system (10). Once a communication channel is open between the remote terminal (20) and the central office (30), the remote terminal (20) transmits channel specific information, application specific information, or both to the central office (30). Once the central office (30) receives the information, the central office (30) can select data rate options optimized for the downstream receiver (the remote terminal (20)). Based on the application specific and/or channel specific information, the central office (30) can use a combination of calculations and look-up tables to formulate new options. When the remote terminal (20) sends channel specific information, the central office (30) can perform calculations which determine performance margins at various data rates.

Abstract: The data network disclosed herein utilizes low duty cycle pulsed radio frequency energy to effect bidirectional wireless data communication between a server microcomputer unit and a plurality of peripheral units located within short range of the server unit, e.g. within 20 meters. By establishing a tightly synchronized common time base between the units and by the use of sparse codes, timed in relation to the common time base, low power consumption and avoidance of interference between nearby similar systems is obtained.

Abstract: A method and system for operating a CDMA cellular telecommunications system having beamforming antennas in combination with other antenna access techniques. System capacity and demand on system resources are dynamically adjusted using beamforming antennas for some mobile stations, and other antenna access techniques for other mobile stations. Forward link channels on the beamforming and non-beamforming antennas are dynamically allocated among mobile stations depending upon resources available and the type of channel required by each mobile station. Forward link channels requiring a higher data rate, above a predetermined threshold, may be assigned to channels transmitted on beamformed antennas. In an embodiment of the invention, the cellular system includes beamformed and non-beamforming antennas.

Abstract: Communication apparatus comprising a vector division multiple access communications system that uniquely extracts a selected communications link from a communications channel containing many simultaneous links. Each link is assigned a unique vector modulation coefficient using the transmit coefficient generator as its link connection address. The vector modulation coefficient establishes the phase and amplitude states of transmit and receive vector modulators employed in the transmitter and receiver, respectively. The receive vector modulator performs antipodal modulation of the link coefficient and remodulates the received modulated transmit waveform by removing the modulation that was applied by the transmit modulator. When a perfect match occurs, the receive modulator completely removes the modulation applied by the transmit modulator. Thus, a data demodulator following the receive vector modulator has no signal to demodulate and its output is therefore zero.

Abstract: When a mobile station is to be called by a fixed terminal device as a caller side, incoming call information containing the intermittent receiving cycle of the mobile station and a mobile station number is sent from a control station to a radio base station. A paging slot received by the mobile station is obtained based the mobile station number and the intermittent receiving cycle. The incoming call information is written in a buffer corresponding to the obtained paging slot in a paging slot table section. A transmission processing section calculates products between intermittent receiving cycles and numbers of holding times. A priority order for transmission is decided based on the calculated products. The mobile station numbers are packed in a paging message starting from the information high in the priority order.

Abstract: A method, access point device and a plurality of peripheral devices provide for controlling a space diversity switch in a time division duplex system. The method includes: inputting data to a peripheral; generating a CRC.sub.1 in a peripheral; transmitting the data and the CRC.sub.1 ; receiving, by an access point device, the data with the CRC.sub.1 ; extracting CRC.sub.1 and generating CRC.sub.2 from received data; determining whether CRC.sub.1 and CRC.sub.2 are equal and where CRC.sub.1 and CRC.sub.2 are equal, failing to generate a repeat request; where CRC.sub.1 and CRC.sub.2 are unequal, generating a repeat request; determining whether a number of requests=N; where the number of requests.noteq.N, incrementing a counter and returning to receiving the data with the CRC.sub.1 ; and where the number of requests=N, resetting the counter, changing an antenna state and returning to receiving, by an access point device, the data with the CRC.sub.1.

Abstract: In a multiuser receiver for use in a Code Division Multiple Access (CDMA) system to produce first through N-th demodulated signals for N-th users in response to an input signal where N is an integer not smaller than unity, the receiver has first through M-th stages, where M is an integer not smaller than unity. In each stage, first through N-th interference cancellation units are included to form the first through the N-th users. Each interference cancellation unit is supplied with a cancellation error signal obtained from a previous interference cancellation to produce an interference replica signal and a spread signal concerned with a difference between the interference replica signal and a previous interference replica signal. An n-th interference replica signal is successively sent to an n-th user of the following stages to be demodulated Into an n-th demodulated signal which is received by an n-th user where n is an integer between 1 and N, both inclusive.

Abstract: A communication system 10 for providing uninterrupted radio operation, including: a pre-transmitter system 12 comprising: (i) a first buffer 14 for storing a sequence of digital audio samples from an audio source 16, the first buffer 30 having a beginning 18, an end 20 and a length 22; (ii) storing means 24 for storing the audio samples in the first buffer 14 in shift register configuration format; and (iii) frame construction means 26 for constructing a data frame including a first audio sample from the end 20 of the first buffer 14 and a second audio sample from the beginning 18 of the first buffer 14; wherein the data frame can be transmitted and received.

Abstract: A method and apparatus for switching/bridging frames between a heterogeneous media is disclosed. Bridges and/or switches normally bit-swap a MAC header of a frame when switching the frame between heterogeneous media. However, this practice introduces errors in address formats in certain situations. Such problems are resolved by investigating whether a frame to be switched includes local address components, and if so, these address components in the frame are manipulated to ensure that the address formats are proper for a media onto which the frame is being switched.

Abstract: Disclosed is a system utilizing a multi-beam antenna and switches the beams to a CDMA demodulation receiver in such a way that the best beams are selected. The transmit path takes the traffic channel outputs from the CDMA modulators and maps each traffic channel to the subset of beams that have the best path to the mobile in the forward link. According, the system operates to reduce interference on both the forward and reverse links, as well as to increase the capacity of both the forward and reverse links. The system also is capable of providing flexible dynamic shaping of the cell and the sectors by mapping the appropriate overhead channels on the forward link and the reverse link in different combinations of beams to sectors in order to shape the cell.