Abstract: An arrangement for cancelling an echo returning to a first mobile station (MS1) from a second mobile station (MS2). The arrangement comprises tandem free operation (TFO) and an acoustic echo canceller (AEC) to which criteria have been defined, upon fulfillment of which the echo canceller replaces an uplink speech signal of the second mobile station (MS2) by comfort noise (CN) in a second coding format. In accordance with the invention, the echo canceller (AEC) generates additional information (AI) if the tandem free operation (TFO) is active and if criteria for replacing the speech signal with the comfort noise are fulfilled at the same time. In response to said additional information (AI), a first transcoder (TRAU1) encodes the speech signal to be transmitted to the first mobile station (MS1) by using the comfort noise (CN) that is generated by the echo canceller (AEC) and that is in the second coding format.

Abstract: The invention relates to a method for configuring a telecommunication system comprising at least one sending entity and one receiving entity between which one and the same link ensures the transmission of several transport channels of different qualities of service. The sending entity performs a rate matching between the various qualities of service, on completion of which the various qualities of service are multiplexed. The matching rate specific to each quality of service is determined on the basis of a first parameter (Eq) representative of the ration Eb/I and of a second parameter (Pq) representative of the maximum puncture rate specific to the quality of service considered.

Abstract: A system and method for operating a mobile station in two modes, voice mode and page mode. A mobile station and a base station are provided. The mobile station is capable of operating in a first mode suitable for receiving telephone calls and in which the mobile station scans portions of a channel at a first rate. The mobile station is capable of operating in a second mode suitable for receiving pages only and in which the mobile station scans portions of the channel at a second rate. The first rate is higher than the second rate and the mobile station is capable of switching between the two modes at the option of the user thereof.

Abstract: A localized wireless gateway system provides wireless telephone communication, and for at least interexchange communication, provides voice telephone access to a public packet data network, such as the Internet. The wireless gateway system includes base station transceivers and a packet service gateway coupling the transceivers to the public packet data network. The packet service gateway compresses and decompresses voice frequency communication signals, and it sends and receives the compressed signals in packet form via the network. The packet service gateway also provides for signaling through the network to establish two-way voice communication sessions. In the preferred implementation, the localized wireless gateway system includes at least one radio port control unit coupled to the base station transceivers for controlling calls through the transceivers.

Abstract: The invention is a replication method that requires only one copy of a packet entering a multiport switch to be transmitted from the input port, the method acquiring the deadlock avoidance advantages of virtual cut-through operation. The goal is achieved via a central buffer, with replication occurring during the read of the chunk out of the central buffer by the output ports.

Abstract: This invention concerns a process for transmission of data in the form of digitally encoded radio signals, where the radio signals are comprised of both a data portion and a protocol portion. This process for achieving high quality data transmission is characterized by the fact that the transmission of the data part is started before, during, or simultaneously with the processing of the protocol portion in a transmission relay.

Abstract: Methods and apparatus for transmitting packets from a source of such packets to one or more radio station sites so that the radio station sites can transmit the packets at the correct real time. Each radio site has an independent source of exact time based on the reception of signals derived from satellite inputs. Using the real time calculated by a base station, the base station calculates an offset between the time of arrival of a signal with a specified time marker, and the time that a signal with that specified time marker should have arrived in order to be transmitted in a timely fashion. The offset is sent back to the source of packets, and used by the source of packets to advance, or retard, the transmission of future packets. Advantageously, packets can be transmitted from each base station at the correct time, and if packets are being transmitted for a given call from several base stations, can be transmitted simultaneously, by these base stations.

Abstract: A system for managing data communication between physical layer devices and ATM layer devices in a cell based ATM network includes a plurality of low speed physical layer devices, a high speed physical layer device, and a bus connected to the physical layer devices. A bus interface device is coupled to the bus, the low speed physical layer devices, and the high speed physical layer device. The bus interface device permits equal opportunities to access the bus to any connected physical layer device. An arbiter is coupled to the low speed physical layer devices, the high speed physical layer device, and the bus interface device. The arbiter provides the high speed physical layer device with disproportionately frequent access to the bus.

Abstract: Multiple streams of digital video data are partitioned into frames of at least two different lengths, where each frame length is an integer multiple times a minimum frame length. Each frame is written into a series of full cells and one or two partial cells. Each full cell carries the same number of video data bits, while each partial cell carries video data bits and/or other overhead bits which together equal the number of video data bits in one full cell. All of the full cells and partial cells for the frames are sent in a time-multiplexed fashion on a communication channel at a single cell rate. A constraint is imposed whereby the different frame lengths are limited to those where the integer multiple of the minimum frame length, divided by the total number of full and partial cells per frame, is a single ratio; and consequently, the video data bits in all of the video streams occur on the communication channel at the same average bit rate, independent of the different frame lengths.

Abstract: A method for quickly de-allocating physical channels (PDCH) assigned to packet switched calls in a GPRS supporting GSM digital cellular telephone network. An PDCH de-allocation RLC/MAC control message is broadcast to listening mobile stations from a base station subsystem (BSS) and contains a temporary flow identity (TFI) which is recognised by the listening mobile stations (MS). The mobile stations respond by terminating packet switched data transmissions on the identified PDCHs. The RLC/MAC message also identifies the number of PDCH time slots which can be used before de-allocation must occur.

Abstract: A device and method for network communications and diagnostics are provided. One embodiment of the device includes a processor for generating a time-domain reflectometry testing stimulus signal when the device is operating in a network diagnostic mode. The testing signal is supplied to the network to cause the network to generate a reflection signal thereof from which presence and characteristics of a fault condition in the network may be determined.

Abstract: The present invention provides methods and a system for transporting A/V data over a serial bus. A memory space is allocated for a set of buffers to store a plurality of CIPs. Each of the CIPs includes a header field and a data field with the header field having a SYT field for storing a presentation time. Initial CIP header values are generated including initial SYT field values for each of the CIP header fields in the set of buffers. A circular DMA script program is generated and configured to describe a set of full and empty CIPs for each of the buffers. The circular DMA script program is configured to transmit the CIPs from the buffers. The generated DMA script program is executed to sequentially transmit the CIPs from the buffers by traversing the buffers in a circular manner so that the transmitted CIPs are presented at the associated presentation time.

Abstract: A quality of service guarantee for voice and other delay sensitive transmissions within an Internet Protocol (IP) network is provided by identifying the IP network path utilized for IP packet transmission between source and destination edge devices and virtually provisioning IP network path bandwidth for priority voice traffic. Priority for voice packets and admission control of new voice calls (and other delay sensitive traffic) based on the remaining available capacity over the IP network path guarantees that high priority voice (and other delay sensitive traffic) meet stringent delay requirements. A Virtual Provisioning Server is utilized to maintain bandwidth capacity data for each path segment within the IP network and to forward the bandwidth capacity data to a Signaling Gateway. The Signaling Gateway determines whether to accept or reject an additional delay sensitive traffic component based upon available bandwidth capacity for an IP network path.

Abstract: A method and apparatus that constructs a “router database” and then uses the database to determine a longest match between a piece of target data, such as an address in a packet to be routed, and the database. The database contains a comparison table having a plurality of entries. In a first embodiment, each entry has up to k values, where 2<=k<=N, where N is a number of comparison values in the database. In a second embodiment, each entry has up to k−1 values. During operation, various ones of the comparison table entries are loaded and compared to the address to determine a longest matching prefix in the router database. The comparison can be done in parallel.

Abstract: A method of distributing video reference signals as isochronous data includes distributing a house reference signal among various audio and video devices using isochronous network packets that exclusively contain isochronous header information rather than header information accompanied by audio and/or video data. Because the data associated with a house reference signal typically represents an unused “video black” signal, such data may be discarded without detrimentally affecting to the reference signal.

Abstract: A method and interface system for hosting a logical address based network protocol suite on a high speed serial bus network which has operatively connected thereto a plurality of network devices, each defining a node with a dynamically variable physical address. The system includes a software interface for monitoring the network to identify the occurrence of a bus reset event which has the potential to change a physical address assigned to the nodes; for receiving an updated physical address provided by the network devices as a result of the bus reset event; computer memory for storing therein an updated physical address together with a corresponding device logical address in an address resolution table. The address resolution table provides a mapping between the physical address and the logical address assigned to each of the devices on the network.

Abstract: This invention provides a conferencing arrangement for use with two or more wireless terminals. According to the invention, the conferencing arrangement receives signals from a plurality of input communication paths of which at least two are from wireless terminals. In one embodiment of the invention, the wireless terminals will receive either a low bit rate (LBR) signal which has undergone conversion from a pulse code modulated (PCM) signal, or an LBR signal forwarded from an input terminal without any conversion. Advantageously, the ability to forward an original LBR signal from a wireless terminal to one or more output terminals reduces unnecessary tandem encoding. In another embodiment, only LBR signals required for conference summing are decoded and encoded, thereby resulting in hardware savings.

Abstract: A communications system and method that separates operational aspects of a packet data service to be provided on a wireless network into separate, independent state diagrams. The method first decomposes the communication service into several different service layers. The method then defines a dynamic behavior of the service layers and an interaction therebetween. Once the behavior and interaction between the layers is defined, the method creates a control element with which to coordinate the service layers.

Abstract: A device for testing a synchronous-transfer-mode switch which is connected to a plurality of input links and a plurality of output links includes a plurality of test data sending blocks each provided for a corresponding one of the input links and each equipped with a function to set test data in a particular time slot of the corresponding one of the input links, thereby allowing the corresponding one of the input links to convey time slots used for a non-test purpose as well as the particular time slot used for a test, and a plurality of test data receiving blocks each provided for a corresponding one of the output links and each equipped with a function to store data of time slots of the corresponding one of the output links when the time slots of the corresponding one of the output links are used for the test.

Abstract: A method and apparatus for demodulating a communication signal transmitted at a first rate is provided, wherein the communication signal includes a plurality of addresses and corresponding data packets. The demodulating method includes the steps of receiving the communication signal at a user terminal, identifying which of the plurality of data packets are destined to the receiving user terminal, and demodulating, at a second rate less than the first rate, only the data packets identified as being destined to the receiving user terminal.