Abstract: Binding proxies are used to reduce packet routing delays and call setup delays in a data network made up of a plurality of subnetworks. The binding proxy detects when a mobile device connects to a subnetwork and sends a binding message to various correspondent device(s) in the data network. The binding message contains a care-of-address of the mobile device that allowing the correspondent device(s) to send messages directly to the subnetwork that the mobile device is connected, thereby bypassing a home agent of the mobile device.

Abstract: A method and system for protecting virtual traffic travelling through a protected domain having of a bridge node connected to a selector node in working and protection paths. Upon detecting failure of the traffic channels in the working path, the detecting node transmits failure information to the selector node along the traffic channels and along an alarm channel in the working path. The selector node initiates protection switching of the traffic channels as soon as failure information is received along the alarm channel. The alarm channel has a sufficiently high priority relative to the traffic channels that protection switching is initiated before failure information is received along the traffic channels. Thus, the selector node can initiate protection switching before receiving alarm cells on traffic channels, which significantly reduces the time during which the traffic channels contain alarm cells. Advantageously, the invention helps prevent premature termination of the end-to-end traffic connection.

Abstract: A packet communications apparatus which can selectively generate a desired packet signal in response to a transmission permission received from an intranet apparatus is provided. The apparatus includes an access control circuit for receiving a transmission permission signal from the intranet apparatus and generating a transmission command signal to instruct the transmission of the packet signal to a multiplexing circuit to each of a plurality of line units on the basis of the transmission permission signal. Each line unit includes a transmission control circuit for controlling so as to store each packet signal into a buffer on the basis of a header information and transmit the packet signal from the buffer to the multiplexing circuit on the basis of the received transmission command signal. Further, the packet signals including the same identification information are stored into the buffer as one packet signal group.

Abstract: A system and method for detecting an error in a transmission of data through an ATM cell in a ATM switching system is disclosed. The present invention allows a system manager to easily detect errors as the errors occur in the ATM switching system.

Abstract: The invention concerns a digital radio (2) for pseudo-duplex radio communication, and a method of transmission time mediation for pseudo-duplex radio communication. A digital radio (2) is in time division duplex communication with a second digital radio (4) over a single radio channel. Control of the radio channel may reside with either radio. However, authority for a radio to change the frame format in order to increase the proportion of time for which it transmits always resides entirely with the radio currently transmitting the least per frame. This arrangement allows rapid response to a need for a radio to move from listening to speaking mode, thereby reducing speech clipping. When the digital radio (2) and the second digital radio (4) are transmitting for equal proportions of the frame, authority to change the frame format passes to the radio that is transmitting at that instant.

Abstract: The present invention includes a method for clock recovery in a packet network. The method includes a network which receives data packets at a destination node. Then the data packets are stored in a buffer. The data packets are read out of the buffer by using a locally generated clock. The fill level of the buffer is monitored over a first period of time. A relative maximum fill level for the buffer is identified during the first period of time. Further, the relative maximum fill level is used to control the frequency of the locally generated clock so as to control the rate at which data is read out of the buffer.

Abstract: In a receiving apparatus, which receiving apparatus performs timing synchronization in OFDM transmission by using specific known patterns included in a reception signal, a correlation value calculation unit calculates signal patterns identical to the specific known patterns, prepares the calculation result in the receiving apparatus beforehand, and performs correlation calculation between the reception signal and the signal patterns while shifting the position of the correlation calculation every specific time. A timing adjustment unit performs timing synchronization in the OFDM transmission by using a plurality of correlation values obtained by the correlation value calculation unit, a maximum correlation value searching unit, and a preceding wave searching unit.

Abstract: A network switching system having a plurality of multiport switch modules arranged in a cascaded sequence uses a signaling protocol that eliminates the necessity of storing a given network address within each of the address forwarding tables of the multiport switch modules. A network switch module, having an address forwarding table for storing switching information for respective stored network addresses and that receives a data packet, outputs a switching request to a subsequent one of the switch modules based on a determined absence of the destination address of the received data packet in the address forwarding table. Each of the successive network switch modules passes the switching request to the next switch module in the sequence upon a determined absence of the destination address in the corresponding address forwarding table.

Abstract: Different portions of a header of each packet containing protocol data are analyzed in succession from different gate registers of the TRIE memory. As a packet arrives, its header is stored in a buffer memory and a first portion of the stored header is analyzed. Each analysis of a portion of header produces either the forwarding reference associated with the packet or an intermediate reference containing a first code, making it possible to locate at an arbitrary location of the buffer memory a next portion to be analyzed, and a second code, making it possible to locate at an arbitrary location of the TRIE memory a gate register from which this next portion is to be analyzed. Having analyzed the first portion of a stored header, the subsequent portions thereof are analyzed in accordance with the first and second codes contained in the intermediate references produced in succession until the forwarding reference is produced.

Abstract: According to the invention, a mobile radio is provided for radio transmission in time-division multiplex frames, where these frames each alternatively have active time slots (Z1) in which data are transmitted, and inactive time slots (Z2) in which no data are transmitted. The time duration of the active time slots is, in this case, twice the duration of the inactive time slots. The mobile radio (1, 2) has a burst mode controller (13) which provides the time-division multiplex frame structure for transmission, and a clock preset device (18), which presets the clock rate for the burst mode controller (13). The clock rate which the clock device (18) presets for the burst mode controller (13) is twice as high during the inactive time slots (Z2) as during the active time slots (Z1).

Abstract: If an instruction is provided so as to receive second content information in place of first content information on the basis of only one operation by a user while the first content information is received through a connection formed in a communication network, the connection for communication of the first content information is disconnected, and thereafter, a connection for communication of the second content information is formed. In this manner, network resources can be reserved or released without consciousness of users.

Abstract: An apparatus and method for distributing the SS7 Message Transfer Part Level 2 (MTPL2) between a Media Gateway and a Signalling Gateway in a Voice over IP Switch is disclosed. The distribution of the MTP Level 2 stack allows data links in a fully associated SS7 network to be terminated on the Media Gateway and SS7 messages to be exchanged between the Media Gateway and the Signalling Gateway over an IP backbone.

Abstract: A system for interconnecting multiple GPS receivers via a single line to simultaneously communicate both serial data and precise timing pulses to numerous GPS receivers using a time multiplexed data format.

Abstract: The present invention concerns a method for use in a telecommunication network by a data traffic policer (POL) for data traffic policing on a data communication link (L). The data traffic includes data cells that are grouped into frames (F1, F2, F3, . . . ). The method comprises the step of for each data cell of a frame (F2), upon reception of the data cell, checking a conformance of the data cell and providing thereby a conformance result of the data cell being any one of conforming and non-conforming (F/T). The method further includes the steps of storing the data cell into a buffer (BUFF) and treating the frame as conforming in the event when for each data cell of the frame that is stored in the buffer (BUFF) the conformance result is conforming (F); and in the event when the frame is treated as conforming (F) and upon reception of a predefined data cell of the frame (F2), starting transmission of a predefined number of data cells of the frame (F2) by the traffic policer (POL).

Abstract: An ATM switch 11 is equipped with a location manager 100 or a location server 200, which realizes the mobility supporting function of a terminal station. The location manager 100 or the location server 200 is equipped with a switching control unit 130 for performing a routing control to take all of data inputted to the ATM switch 11 in, an APCP processing unit 110 for translating a signalling signal into an APCP message, a SIG+M processing unit 120 for terminating a signalling, translating the APCP message for a communication with an access point into a SIG+M signal, which is a signalling signal added with the mobility supporting function of the terminal station, and executing the SIG+M signal and an ATM cell header conversion unit 140 for converting an ATM cell header of the SIG+M signal on demand.

Abstract: A method, system and computer software product for managing jitter buffering that accurately measures network latency, the variation in latency (also known as jitter), and efficiently manages the media packet stream and jitter buffers is disclosed. A framer time-stamps incoming packets. A traffic analyzer maintains a sliding window of statistics generated from a recent set of packets. A jitter manager monitors packets, receives and makes adjustments based on information received from the traffic analyzer, and manages any connected jitter buffers.

Abstract: A method for predicting the percentage of real-time a processor in a base station is being utilized (i.e., processor occupancy) based only on calling rates, given measured call control event (i.e., origination, termination, handoff, paging, registration, and locate rates) data for the base station. Constant ratios between the various call control events and the calling rates (e.g., originations+terminations) are determined for the base station. Given the actual time spent by the processor on each type of call control event and the constant ratios, the processor occupancy is accurately predicted using call originations+terminations or call origination rates as variables. The processor occupancy may be fixed at some value (e.g., 90%) and the calling capacity of the base station (i.e., the total number of call originations and terminations which will result in such processor occupancy) is determined from the determined relationship between processor occupancy and calling rates.

Abstract: A method and apparatus for processing a data packet of an Ethernet switch system in which packet information is transferred from a first device to a second device on the basis of field information of a packet inputted through an Ethernet, including the steps of: detecting a first address from a packet inputted to a predetermined input port of a MAC through the Ethernet; determining an output port of a packet to be detected from the MAC on the basis of the first address provided from the MAC on a real time basis and a MAC address stored in a search memory; and detecting whether the determined output port is ready to use or not and transferring a packet detected from the MAC to the Ethernet through the output port.

Abstract: A real time device polling method for multiplexed transmission of on/off constant bit rate data, such as voice data from a telephone call, over a cable data network is disclosed. The network serves as a shared bus for both the downstream and upstream traffic. The upstream channel is modeled as a stream of mini-slots. A cable modem termination system at the head end supports a number of cable modems attached to the cable network and connected to customer premises equipment. Allocation maps are transmitted on the downstream channel to the cable modems to define transmission opportunities on the upstream channel. The cable modem termination system polls the cable modems in an efficient way such that the overhead associated with the polling is minimized, and the availability of data transmission slots is synchronized with the data packet generation by the codec for the cable modem, which minimizes delay.

Abstract: The invention provides persistent communication for address routed communication in an environment where the communication session address changes. The invention is appropriate for any address routed communication, and in particular to packet based (e.g., UDP/IP and TCP/IP) communications to mobile cellular units as the units transition or move between supporting cells. The invention provides a technique to store address information and transitory information related to the session to allow continuation of the session at the new address, thereby reducing or eliminating the need to set up the session at the new address. One application is for streaming multi-media sessions. Another application is for internet protocol (IP) telephony. The invention provides embodiments where the techniques are performed within the mobile unit, or performed in combination with a proxy server that is part of the supporting cellular system.