Abstract: This invention concerns a method of providing a VoIP connection through wireless communication links of a packet-based wireless communication system, and a corresponding base station and terminal. The wireless communication links comprise an uplink transmission path (2uc, 2us) from the terminal to the base station, and a downlink transmission path (2dc, 2ds) from the base station to the terminal. Each of the uplink and downlink transmission paths (2uc, 2us, 2dc, 2ds) have a control channel (2uc, 2dc) and at least one data channel (2us, 2ds). Control messages (20d, 21d, 220u, 221u, 230d, 250u, 260u) are generated for scheduling network resources and for suspending and/or re-issuing a persistent grant of network resources allocated to the VoIP connection.

Abstract: A driving circuit and Mach-Zehnder EAM optical modulator exhibiting negligible chirp that generates a PSK signal when driven by a single drive signal. Two such Mach-Zehnder EAM optical modulators and drive circuits may be configured in parallel, thereby generating DQPSK signals with only two drive signals, one for each individual Mach-Zehnder EAM modulator.

Abstract: The invention concerns a method of managing coexisting packet streams (100, 110) in a wireless communication system, and a corresponding controller and a mobile terminal. A first packet stream (110) of the coexisting packet streams (100, 110) requires transmission resources of the wireless communication system at fixed time intervals, and a second packet stream (100) of the coexisting packet streams (100, 110) requires transmission resources of the wireless communication system at dynamically determined time intervals. A schedule defining allocations of transmission resources for the first packet stream (110) is set up. A request for an initial grant of transmission resources for a transmission of a data packet (101) of the second packet stream (100) is issued.

Abstract: A method of optically equalizing a multi-level (amplitude or phase) optical signal through the effect of an optical equalizer wherein the optical equalizer (OEQ) is placed at either a transmission end or a receiver end of the optical communications link and a tap delay characteristic of the OEQ need not be determined by symbol spacing, rather it may advantageously be adjusted to desirably compensate non-linear mapping performed in the modulation process or simultaneous operation on a plurality of wavelength division multiplexed (WDM) channels.

Abstract: An apparatus in one example comprises a manager component in communication with a distributed software application. The distributed software application comprises a plurality of software components that run within one or more executables. The manager component shuts down the plurality of software components in an ordered sequence based on one or more dependency relationships among the plurality of software components.

Abstract: A method for data path provisioning in a reconfigurable data network is disclosed. A data path between a source IP router and a destination IP router is determined taking into account the IP-subnets of the network interfaces of the IP routers included in the path. In one embodiment, the requirement that two IP routers can send packets via their connected interface if and only if the two interfaces are on the same subnet (i.e., the subnet constraint) is completely honored during the data path determination. In another embodiment, the data path is determined while allowing some number of violations of the subnet constraint. A transform network graph is computed and is used to determine the data path taking into account the IP-subnets.

Abstract: A method and apparatus are disclosed for monitoring and signaling a path restoration using pre-computed restoration paths following a detected fault on a primary service path in a communications network. A fault occurring inside the restorable portion of a network in heterogeneous or multiple network environments can be distinguished from faults occurring outside the restorable network in accordance with the ANSI Tandem Connection Maintenance standard, T1.105.05-1994. Path restoration is activated only when a fault causing path failure occurs inside the restorable portion of the network. Each conforming node in the restorable portion of the network has the necessary monitoring, signaling and cross-connect functionality and databases to participate actively in real time restoration. Additional non-conforming network elements can be positioned between the restoration nodes without preventing path restoration.

Abstract: Bit error patterns for high speed data systems are generated by randomly distributing a first error pattern of G bits, output from a group of substantially uncorrelated bit error generators, into a second error pattern of N bits, where G and N are integers and G is less than or equal to N. In one embodiment, G bit error generators produce a G bit error pattern per bit period. Each bit error generator operates at a prescribed bit error rate. A distribution element randomly rearranges the order and placement of the G bits produced during a single bit period within an N bit grouping. The N bit group corresponds to N consecutive bits of data with which the error bits can be combined. Each bit error generator can be realized by a linear feedback shift register or its equivalent. Different primitive polynomials and different lengths can be used for each linear feedback shift register. In addition, outputs from fewer than all the shift register stages are utilized to generate each error bit.

Abstract: In a representative embodiment, a transmitter of a WDM communication system is equipped with a Mach-Zehnder modulator (MZM) configured to produce an optical signal corresponding to a duobinary data stream by modulating a beam of light passing through the MZM. A three-level electrical signal is applied to the MZM to modulate the light. At the second signal level, the modulator substantially blocks light transmission. At the first and third levels, the modulator transmits light corresponding to the duobinary “?1” and “+1” bits, respectively, such that a relative phase shift between the optical bits is different than 180 degrees, i.e., the phase shift value employed in prior-art optical duobinary modulation.

Abstract: A telecommunication system, method, apparatus, and computer readable media that implements an open application program interface (API) system in which open API servers pass and receive API commands to applications through a novel proxy. The proxy assists implementing various management functions, such as assigning open API servers to application and monitoring the overall system, and service contract control, all beneficially in a transparent manner. The proxy enables the telecommunication system to handle geographically diverse applications and open API servers. All API command can, but need not, pass through the proxy.

Abstract: A method and apparatus for providing user orientated wireless data services over a wireless communications network to a plurality of mobile nodes. The wireless communications network includes a plurality of packet data servicing nodes (PDSN's), a plurality of packet control functions (PCFs), and a PCF-PDSN routing controller (PPRC). The PPRC acts as a single PDSN, as well as a surrogate PCF from the perspective of the PDSNs in the private IP network of the service provider. The PPRC serves to provide user oriented wireless services, as opposed to device orientated services. The method includes receiving a data session request from a mobile node, and initiating a point-to-point connection between a PCF receiving the data session request and a PPRC. The PPRC selects one of the PDSNs, and initiates a point-to-point connection between the PPRC and the selected PDSN.

Abstract: A light weight antenna system and corresponding lightweight transmission lines are disclosed that are characterized as having an extremely light weight relative to prior such systems and lines. An inflatable body having an inner surface connected to an outer surface with a plurality of support structures, such as connecting tubes. Antenna elements are disposed on the outer surface of the inflatable body to form, for example, a phased array antenna. Coaxial transmission lines are used to transmit signals to and from an antenna element and are, in one embodiment, created by disposing an inner conductor within the aforementioned connecting tubes. Such a transmission line may be utilized in a number of applications, such as to connect a base station to an antenna system of a wireless communications network. In another embodiment, quasi coaxial transmission lines are formed by disposing flexible membrane shields around a transmission elements.

Abstract: The call forwarding is provided within and between telephone networks by establishing a generalized procedure for call delivery and call forwarding. Network protocols are addressed using a common framework for processing call delivery and call forwarding among any combination of different types of networks. An “integrated location management” component realizes the generalized procedure. The integrated location management component is a device capable of holding location information for diverse cellular networks, including Internet telephony systems. The inventive system and method executes generalized call delivery and call forwarding for calls among different types of telephone networks, including wireless networks and Internet networks. The calls may originate from any type of telephony network. Having been initially directed to any of these networks, calls can then be call forwarded to any of these networks.

Abstract: A method of data communication. The method includes initially receiving one or more channel quality information signals from each wireless unit. The channel quality information may be received in response to the transmission of one or more pilot signals. Once the channel quality information signal(s) from each wireless unit are received, the method then includes selecting one or more transmit powers and one or more transmission rates for each wireless unit. Thereafter, one or more blocks of orthogonal continuous waveforms may be transmitted over a channel to each wireless unit using the selected transmit power and selected transmission rate.

Abstract: An apparatus and a method for managing resources for efficient packet data transmission. More specifically, there is provided a method for allocating transmission resources in a base station comprising determining a largest supportable packet size for a highest priority user, wherein the determination is based at least partially on the available modulation types, a total number of codes available for packet transmission, a total amount of available transmission power available for packet transmission, and frame durations supported by a base station.

Abstract: Semiconductor optical modulator devices exhibiting improved chirp characteristics are constructed from a Mach-Zehnder structure having resonators positioned within each arm and a number of phases shifters positioned within the arms, and/or resonators.

Abstract: Apparatus including a color mixing light source having a first laser configured to lase at one or a plurality of light emission wavelengths of 459 nanometers or less and a second laser configured to lase at one or a plurality of light emission wavelengths of 470 nanometers or more; and a controller having a color control data input and a color control data output configured to cause the color mixing light source to generate a perceptual mixture of light having a perceptual color, the perceptual mixture including light emissions from the first and second light sources. System configured to map first color control data to second color control data. Method of forming a perceptual mixture of light having a perceptual color. Method of converting color control data.

Abstract: We formulate the network-wide traffic measurement/analysis problem as a series of set-cardinality-determination (SCD) problems. By leveraging recent advances in probabilistic distinct sample counting techniques, the set-cardinalities, and thus, the network-wide traffic measurements of interest can be computed in a distributed manner via the exchange of extremely light-weight traffic digests (TD's) amongst the network nodes, i.e. the routers. A TD for N packets only requires O(loglog N) bits of memory storage. The computation of such O(loglog N)-sized TD is also amenable for efficient hardware implementation at wire-speed of 10 Gbps and beyond. Given the small size of the TD's, it is possible to distribute nodal TD's to all routers within a domain by piggybacking them as opaque data objects inside existing control messages, such as OSPF link-state packets (LSPs) or I-BGP control messages.

Abstract: Apparatus defining a circuit module for receiving an operating voltage on an input and for generating a voltage of a lower magnitude that is applied to an intermediate bus. A holdover energy source, such as an ultra capacitor or the like, of the circuit module has a voltage lower than said input voltage and the voltage of said intermediate bus. The holdover energy source is connected under control of a voltage supervisor to a boost converter in response to the receipt of a transient on the input. The boost converter is responsive to the connection to generate a boost voltage that maintains a constant voltage on the intermediate bus.

Abstract: A method is provided of evaluating the frame error probability (FER) of a selected communications link in a telecommunications network. The link is that between a MIMO transmitter comprising one of a base station or mobile user terminal, and MIMO receiver comprising the other of the base station or mobile user terminal. The method comprises determining values of instantaneous channel capacity of a MIMO channel of a mobile user terminal at multiple time instants over a predetermined time, processing the values to determining a level of channel capacity which any of the instantaneous channel capacity values has a predetermined probability of being less than, and looking up said level in predetermined calibration data of FER versus the channel capacity level so as to provide an FER value.