Abstract: Radio communication apparatus includes a baseband processor for modulating data to be transmitted into an IF signal and for demodulating an IF signal derived from a received high frequency signal. A front end section receives the IF signal from the baseband processor and converts that IF signal into a high frequency signal for transmission. The front end section also is adapted to receive a high frequency signal from a remote location, and converts the received high frequency signal into an IF signal that is supplied to the baseband processor for demodulation and data recovery. The front end section is operable in a plurality of frequency bands and is tunable to a frequency within a selected one of the frequency bands for use as a radio frequency channel. Consequently, the number of simultaneously assigned channels in the same area can be markedly increased and the possibility of interrupting a communication link is significantly reduced.

Abstract: Fragmentation of non-realtime data for transmission in frame relay networks is sized dynamically according to available bandwidth. The bandwidth is determined according to burst interval and burst size calculations based on parameters including the amount and type of realtime data to be sent and the percentage of burst interval utilized by the realtime data. If no realtime data is being sent, then the fragment sizes of the non-realtime data are adjusted to utilize the entire available bandwidth.

Abstract: A DMT/OFDM transceiver wherein communication occurs between stations in the form of symbols distributed and transmitted in channels which are allocated when making a link between the stations, each channel supporting a number of bits depending on the spectral response of the link when established. Instead of providing separate modules for performing iFFT's and FFT's, the transceiver has only a single FFT, or iFFT which operates on real and imaginary parts of the data stream; the outputs of the FFT or iFFT being supplied to a post processing stage where simultaneous equations having real and imaginary terms for the transmit and receive data, are solved in order to separate the transmit and receive data.

Abstract: In accordance with one aspect of the present invention, the detection of voice signals versus modem signals in a data communication system may be conducted, a determination can be made whether existing VoIP algorithm functions or characteristics may be appropriate for modem communications, and then the VoIP algorithms may be modified to improve operating conditions for a modem connection. Additionally, the existing VoIP algorithm functions and network characteristics within the data communication system that may degrade modem performance can be identified prior to the determination of whether the VoIP algorithm functions are appropriate for modem communications. In accordance with another aspect, the detection between voice signals and modem signals can also comprise the determination as to a particular type of modems signal. Further, control of the adaptive jitter buffer to remove or reduce adaptation during detection of modem signals can be provided.

Abstract: By virtue of one embodiment of the present invention, dynamic signal to noise ratio measurements made on received signals are used to identify degraded segments of a channel. The degraded segments are then no longer used for transmitting payload data. In the context of an orthogonal frequency division multiplexing (OFDM) communication system, degraded OFDM subchannels, as determined on a real-time basis, are not used to transmit payload data. In an OFDM network where access is shared in the time domain among multiple transmitters and a single allocable time slot includes an integer number of OFDM bursts, the medium access control layer adjusts packet length, and therefore the amount of data to be included in a given slot, in response to the fluctuating number of available subchannels.

Abstract: A method and an arrangement are provided for indicating the specific use of a packet-switched communication connection between a mobile station and a fixed packet-switched data transmission network. The activation of a new packet-switched communication connection involves the step of transmitting an activation request message with a service type indicator field for which a set of service type indicator values have been defined. An additional step is performed for transmitting within the activation request message an indicator value indicating the specific use, in more detail than the service type indicator values, of the packet-switched communication connection the activation of which is requested with the activation request message.

Abstract: A foreign agent to which a correspondent terminal is attached receives a Binding Update Message from a home agent so that the foreign agent encapsulates an IP packet destined for a mobile terminal 11 before transmission thereto.

Abstract: A packet scheduler includes a packet manager interface, a policer, a congestion manager, a scheduler, and a virtual output queue (VOQ) handler. The policer assigns a priority to each packet. Depending on congestion levels, the congestion manager determines whether to send a packet based on the packet's priority assigned by the policer. The scheduler schedules packets in accordance with configured rates for virtual connections and group shapers. A scheduled packet is queued at a virtual output queue (VOQ) by the VOQ handler. In one embodiment, the VOQ handler sends signals to a packet manager (through the packet manager interface) to instruct the packet manager to transmit packets in a scheduled order.

Abstract: Wireless local area networks (“wireless networks”) used to interrelate individual mobile nodes, and having the capability of automatically establishing and/or modifying functionality of a network in response to the characteristics and/or identity of the nodes connected to the network at a given time. The wireless networks may be mobile, and may be employed in applications using service vehicles, such as truck, skid and trailer mounted equipment used in the well servicing industry, delivery or maintenance trucks, railroad service vehicles, aircraft, or off-shore service vehicles.

Abstract: In an apparatus, there are provided an IP transmitting and receiving unit for transmitting and receiving an IPv4 packet and an IPv6 packet; an IP header converting unit for performing a mutual conversion of the IPv4 packet and the IPv6 packet by an IP header conversion; a DNS substituting unit for receiving a domain information capturing request sent from an IPv4 terminal or an IPv6 terminal and substituting its process; an IPv4 address capturing unit for capturing an IPv4 address from a DHCP server; and an IP address conversion information holding unit for holding an IPv6 address of the IPv6 terminal and the IPv4 address captured by the IPv4 address capturing unit in correspondence to each other. Thus, a communication with the IPv4 terminal can be executed without preliminarily fixedly allocating the IPv4 address to the IPv6 terminal.

Abstract: Disclosed is a method and system for dynamically selecting a communication channel between an access point (AP) and a plurality of stations (STAs) in an IEEE 802.11 wireless local area network (WLAN). The method includes the steps of: determining whether a new channel between the AP and STAs within a particular basic service set (BSS) is needed; requesting a channel signal quality measure to some of the plurality of stations by the AP; reporting a channel signal quality report back to the AP based on a received signal strength indication (RSSI) and a packet error rate (PER) of all channels detected by the stations within the BSS; selecting a new channel based on the channel quality report for use in communication between the AP and the plurality of stations.

Abstract: A system and method for making available on a dynamic basis a large library of different firmware processing algorithms to each DSP processor engine of a DSP processor array is disclosed. A master DSP engine continuously broadcasts firmware algorithms used in processing a number of types of data from an attached memory to service DSP engines over the channelized serial bus. The DSP array receives PCM data from multiplexed lines of a public switched telephone network and packetized data from an Internet Protocol (IP) network, then each service DSP engine determines a firmware algorithm required to process the type of data received. The service DSP engine processes the received data using that firmware algorithm.

Abstract: The present invention facilitates cluster formation within a communications network by utilizing network topology information to designate network nodes that are crucial for relaying traffic as cluster head nodes, while remaining network nodes are designated as member nodes. A beacon packet transmission rate of a network node or the interval between successive beacon packet transmissions by that node is adjusted by the present invention to facilitate cluster formation independent of network size and varying initial start times of network nodes. In addition, the present invention utilizes the above described cluster formation technique to form a three tier architecture for transmission or flooding of routing information from head node databases throughout the network. The cluster formation technique is applied to cluster head nodes to form an additional network tier of super nodes that distribute routing information, while cluster head nodes route network data traffic.

Abstract: Network tunneling methods and apparatus utilizing flow state information are provided. A router includes an ingress linecard having logic that selects a particular network tunnel for a received micro-flow. The ingress linecard further includes logic that selects a particular egress linecard and a particular port to utilize for transmitting the micro-flow. The router also includes an aggregate flow block that includes tunnel specific information for the selected network tunnel. The tunnel specific information includes but is not limited to label action and outgoing label(s), Layer 2 tunneling action or Layer 3 actions. The aggregate flow block further includes statistics for the selected network tunnel. In addition, the router includes a flow block having flow state information for the micro-flow. The flow block also includes an identifier that associates the flow block with the aggregate flow block.

Abstract: This invention is intended to eliminate an operation to copy the frame-relay frame, which was written in a memory through a frame transmission processing device, into another area excluding a memory table for the frame data, when a multiprotocol of a frame-relay frame is converted into a multiprotocol of the AAL5 frame. The frame-relay frame transmission circuit performs retrieval in the connection table and obtains the shift size by which the frame is to be shifted from the top address of a frame buffer. Then, the circuit searches the frame buffer, and transmits the frame buffer address with the shift information to a processor bus interface. The processor bus interface transmits the received frame to the address in the DMA transmission process.

Abstract: A dynamic channel allocation method and system for use in a wireless network operates by monitoring at least the allocated channel allocated to a particular network node to generate one or more channel metrics relating to radio conditions on the channel. The metrics generated are Received signal power, signal to noise ratio of transmissions on the network and long-term mean square of the equaliser error used in each terminal. The generated metrics are communicated back to the cell access point or the network control server over a signalling channel, and a new frequency is allocated to the cell if it is determined from the metrics that the presently allocated channel is suffering interference. The signalling channel is preferably an ATM VPI/VCI pair, such that signalling messages are transmitted as ATM cells which can be communicated across the wireless channel using the sane signalling frame as is used for payload cells.

Abstract: A communication interface device includes a wireless Internet packet (IP) transceiver and a flash memory card electrically connected to the transceiver. Also, a universal serial bus (USB) connector is plugged into a hub that holds the flash memory card, with a cord extending from the USB connector and terminating in another USB connector. Accordingly, the flash memory card of the device can be engaged with a slot of a user terminal or, if a user terminal has no slot, the USB connector is engaged with a USB receptacle of the user terminal, to establish wireless communication between the terminal and a base station of a wireless LAN/WAN.

Abstract: A high-resolution, per-packet measurement tool for analyzing a computer network that operates by sending a predetermined number of packets from a sender machine to a receiver machine with measurement information inserted into the packet. The system kernel at the sending machine stamps a sequence number and the sender's local time into the data section of each packet. When packets arrive at the receiver machine, they are similarly stamped by the receiving machine's kernel with the receiving machine's local time. The maintained packet information serves as the basis for latency analysis. For example, one set of latencies can be obtained with QoS mechanisms turned on, and another set with QoS mechanisms turned off, whereby the benefits of the QoS mechanisms can be accurately determined. To analyze the latencies, the present invention normalizes each time and each latency into relative latency information. Clock skew and timer jumps may be handled as part of the normalization.

Abstract: A VoIP gateway system for use in the IP network comprises a plurality of voice processing units, each having a unique IP address and a main processing unit connected via a HUB. The voice processing units and the main processing unit share the local LAN for sending and receiving a voice data packet by connecting the PSTN and the IP network. The load concentration on the system bus is reduced, thus effectively increasing the number of lines which can be handled for one voice processing unit. When transferring a packet to the IP network, only the IP address of the main processing unit is managed by the gatekeeper, thus effectively performing the IP address management at the gatekeeper.

Abstract: An optoelectronic device that has a network address (e.g., IP address) and participates in in-band traffic for purposes of performing functions (e.g., network diagnostics, network control, network provisioning, fault isolation, etc.) that are traditionally performed by host equipment. An embodiment of the invention may have a protocol engine and a status monitoring module. The protocol engine identifies data packets that are addressed to the optoelectronic device, and allows the optoelectronic device to insert packets of information generated by the device into in-band data. Logic of the optoelectronic device may modify the operating parameters of the device according to the control information included in the data packets. The status monitoring module detects the device's physical conditions and the conditions of its links.