Abstract: Disclosed is a method of data rate adaptation based on channel conditions. In the present invention, data is initially transmitted at a first data rate based on a measured first channel condition and, if a NACK is received, the data is retransmitted. The data retransmitted is at a rate which is based on the condition of the channel during or before the transmission of the NACK. The data retransmission rate can also be based on the actual channel condition at the time of the first transmission plus the condition of the channel before or during the transmission of the NACK.

Abstract: A transmitter for wireless communications provides multiple types of orthogonality to improve transmit diversity. Transmit diversity is improved by using both coding and carrier frequency orthogonality. Data to be transmitted is broken into four parallel channels. Two of the channels are transmitted on a first carrier signal and the other two channels are transmitted on a second carrier signal. Channels transmitted on the same carrier signal are provided with orthogonal codes so that they may be separated by a receiver. Channels transmitted on different carrier signals may be encoded with identical orthogonal codes. The modulated carrier signals are then transmitted using at least two antennas, where one antenna is used for each carrier.

Abstract: An improved wireless network provides intersystem handoffs between existing circuit wireless systems and packet systems. A packet wireless system is enhanced to provide translation between circuit and packet call models. A Media Gateway translates bearer traffic between formats used in each system. The Media Gateway, a Media Gateway Control Function, and an associated Call State Control Function, cooperate to emulate the behavior of a circuit wireless system, so that when interoperating with conventional circuit systems, the packet system appears to be another circuit wireless system. Where necessary, the Media Gateway, Media Gateway Control Function, and Call State Control Function further cooperate to emulate the functions of an anchor MSC of a circuit wireless system.

Abstract: A technique is disclosed for automatically determining system configuration information, including the type and version of hardware installed on remote equipment. A modified central control station communicates with each remote cell station to perform an iterative system configuration process that progressively refines the system configuration information, until the actual installed system configuration is obtained, or until manual intervention is required. The system configuration process initially assumes a system configuration having the cell station fully installed with a default hardware component. The default “guess” is sent to the cell station which, in turn, communicates with each of the hardware components using a message protocol appropriate for the assumed configuration. In one embodiment, the cell station queries each of the hardware components for their associated type and version.

Abstract: A method and apparatus regulate the admission control of, and requests for routing of, virtual circuits in a network by determining network resource requirements for the virtual circuits. The method is generalized for the shared-memory architecture of a network node, to allocate a buffer size value, Bi, to an output port, i, for use in the effective bandwidth computation. A static allocation policy is utilized to allocate the available buffer, BSMF, to each output port, i. The allocated buffer is determined by selecting a value from a range having a lower bound obtained by partitioning the buffer, BSMF, to evenly divide the buffer space among all the output ports, such that &Sgr;iBi=BSMF; and having an upper bound obtained by using the total available buffer, BSMF, for each port in their computation of effective bandwidths. The network resource requirements are based on a set of parameters used to control the flow of information from a communications device onto the virtual circuit.

Abstract: A virtual transport server apparatus in a telecommunication network having a packet network and a circuit network with a telephonic switching device, a circuit signaling interface for terminating a signaling link between the virtual transport server apparatus and the telephonic switching device coupled to the circuit network and a packet signaling interface for terminating a packet link between the virtual transport server apparatus and the packet network. A circuit receiver is coupled to a processor and the circuit signaling interface for receiving call origination information having a circuit identification code from the telephonic switching device at the circuit receiver and a packet transmitter coupled to the processor and the packet signaling interface for transmitting the call origination information from the virtual transport server apparatus to a packet circuit gateway in response to the processor processing the call origination information from the circuit receiver.

Abstract: In a multicast network, a method is employed for selecting a low cost multicast conference tree subject to an end-to-end delay constraint for transmissions between any two nodes in the tree that terminate conference participants. The method employs a constrained minimum cost Steiner tree selection technique that integrates facilities costs and a delay constraint into a single objective function to be minimized as the tree is incrementally configured. The method also incorporates a unique path delay metric (delta diameter) that indicates the effect on end-to-end delay resulting from the incremental addition of a next node to the Steiner tree.

Abstract: The process time required for fluorine doping of porous silica bodies to produce fluorine doped preforms for the manufacture of depressed index optical fibers is reduced by separating the doping step into a predeposit step, where “excess” fluorine is deposited on the silica particles, and a drive-in step where atomic fluorine is distributed into the silica particles. The drive-in step is conveniently combined with the sintering or consolidation step to further enhance the efficiency of the doping process.

Abstract: A telecommunications system having a controller, a local terminal, and a modem, a switch includes a first buffer having an input and an output. The input of the first buffer is connected to the controller, and the output is connected to the local terminal. The switch includes a second buffer having an input and an output. The input of the second buffer is connected to the controller. The output of the second buffer is connected to the modem. Each of the buffers has an enabled state and a disabled state. The buffers are connected to the local terminal to receive an enable signal. When the first buffer is in the enable state and the second buffer is in the disabled state, the first buffer provides a communication path from the controller to the local terminal. When the first buffer is in the disabled state and the second buffer is in the enabled state, the second buffer provides a communication path from the controller to the modem.

Abstract: A network includes an operations support system (20) for managing one or more network elements (40), and an interface (10) between the operations support system (20) and each network element (40). The interface (10) includes a network element side mediator object (14) and a corresponding operations support side proxy mediator object (14p). During initialization of the interface (10), method calls from the proxy mediator object (14p) to the mediator object (14) are employed by the operations support system (20) to obtain a list of data tables supported by the network element (40). The interface (10) also includes a network element side interface object (12) and a corresponding operations support system side proxy interface object (12p). In this case, during initialization of the interface (10), method calls from the proxy interface object (12p) to the interface object (12) are employed by the operations support system (20) to obtain a list of attributes for each data table listed.

Abstract: An apparatus having an identification code in a communication network comprising a transceiver coupled to the communication network receiving a message having an alias identification code assigned to a switch call controller and a separate independent switch fabric controller portion. The apparatus also having a processor coupled to the transceiver, an input/output port for communicating with the independent switch fabric controller device, for sending a resource allocation message to the input/output port for transmission to the switch fabric device in response to receiving the message having the switch fabric data portion.

Abstract: A method for processing signals from multiple receiving/transmitting elements that define an array antenna is disclosed. The method includes measuring uplink signals from the elements of the array antenna to form a directional downlink antenna response. A first covariance matrix between pairs of uplink signals is determined for desired signal components of the measured uplink signals. A second covariance matrix is determined for noise and interference components of the measured uplink signals. An antenna processing system computes adaptive weights based on the first covariance matrix, the second covariance matrix and a loading term to in effect form a directional downlink radiation pattern. The loading term represents a balance adjustment between a first performance rating of a particular coverage area versus second performance rating of the wireless communication system.

Abstract: An optical fiber shutter adapter including a housing having a bay and a bay opening for receiving a second connector. The optical fiber shutter adapter further includes a door disposed near the bay opening and having a blocking portion for blocking laser radiation from being emitted from the bay opening when the door is in a closed position. The door is connected to the housing for movement from the closed position to an open position for allowing the second connector to be received into the bay for connection to the shutter adapter. The blocking portion of the door moves into the adapter housing when the door is moved from the closed position towards the open position.

Abstract: The present invention provides a composition for selectively delivering an active agent to a portion of an organism. The composition comprises first and second polymer portions, having first and second functional groups attached as a side-chain thereto, respectively. The first and second functional groups form cross-links between the first and second polymer portions. The cross-links are capable of being broken by a substance of the organism, thereby resulting in release of the active agent. The composition provides a novel means for controlling the selective release of the active agent in the organism.

Abstract: Techniques for synchronizing the clock of a local telecommunications network connected to a remote clock source through an asynchronous transport network such as an Ethernet metropolitan area transport network. A basic holdover loop for retaining the current reconstructed clock frequency signal receives weighted corrections from an open loop and a network time protocol filter loop. The open loop measures data packet interarrival times on the local network and calculates a first reconstructed clock frequency signal. The network time protocol loop applies network time protocol to generate timestamps over the asynchronous transport network which are used to generate a second reconstructed clock frequency signal. The first and second reconstructed clock frequency signals are combined using dynamically adjusted weight factors and compared with the current reconstructed clock frequency signal to correct the latter which then synchronizes the clock of the local telecommunications network.

Abstract: The present invention provides an adaptive filter. In one embodiment, the adaptive filter includes a solution vector generator that develops a sparse expression of an initial solution vector. In addition, the adaptive filter includes a proportionate normalized least mean squares (PNLMS) analyzer, coupled to the solution vector generator, that employs the sparse expression to converge upon at least one coefficient for the adaptive filter.

Abstract: A method for reducing intra-channel, non-linear distortions of an optical signal resulting from non-linear fiber propagation includes applying a polarization mode dispersion (PMD) pre-distortion to an optical signal such that the PMD pre-distortion produces two replica signals of the optical signal spaced by a differential group delay (DGD). The replica signals are adapted for transmission via an optical fiber. The DGD spacing is selected to reduce intra-channel, non-linear distortions imparted by the optical fiber.

Abstract: Techniques for location determination are described. A plurality of tags emitting radio frequency signals are dispersed throughout an region, such as a building, within which a user's location is to be determined. The radio frequency signals emitted by the tags include information that can be used to identify the location in which the tags are placed, or simply to distinguish the tags from one another. A portable device receives signals from the tags and provides the signal information to a location server that computes the location of the portable device by comparing the signal information received from the portable device to a map of location versus stored signal information, and identifies the location of the portable device as the location for which the stored signal information best matches the signal information received from the portable device.

Abstract: A system, apparatus and method are provided for subscriber control of timed and regional membership in multiple member termination groups for multiple leg telecommunication sessions, such as for providing outgoing call legs for a flexible alerting service, to different groups of members, at different times of day or different geographic locations. The preferred system includes a home location register coupled to a mobile switching center. The home location register has, stored in a memory, a plurality of secondary directory numbers associated with a primary directory number, and includes instructions to determine whether each secondary directory number, of the plurality of secondary directory numbers, is currently incorporated within a selected alerting group based upon a predefined time period parameter or a geographic location parameter for a mobile unit corresponding to the secondary directory number.

Abstract: The present invention provides a composition comprising a first polymer and a second polymer cross-linked by the association of functional groups attached as side chains to the polymers.