Abstract: A media gateway controller (MGC) is described herein that implements a shared risk group package to control and prevent a media gateway (MG) from establishing redundant links like a primary link and a secondary link that use resources that share the same risk of failure. Essentially, the MGC uses the shared risk group package to control which resources like ephemeral terminations are used by the MG to establish the primary link and the secondary link such that if any of the resources associated with the primary link fail then the secondary link remains operational within the MG and if any of the resources associated with the secondary link fail then the primary link remains operational within the MG.

Abstract: A system and method for selecting a starting point to transmit a beacon (BTSP) from a coordinator and a first node in a communication system. The communication system includes the coordinator, a first node group with at least one node having the first node which receives the beacon from the coordinator, and a second node group with at least one node having a second node which receives the beacon from the first node. The coordinator determines a beacon window size for the beacon transmission, selects the BTSP within the beacon window size, and transmits at the BTSP, the beacon containing information on the beacon window size and the BTSP. The first node selects its BTSP within the beacon window size so as not to overlap with the BTSP of the received beacon.

Abstract: An apparatus and method are provided for bypassing a load coil in a Digital Subscriber Line (DSL) circuit. An interface is provided for making a connection with the DSL circuit and receiving a combined multichannel signal. The combined multichannel signal includes a high frequency or DSL signal and a low frequency signal or voice signal. A high pass filter is utilized to block the voice signal and route the DSL signal over a communications path to bypass the load coil in the DSL circuit. The voice signal is then routed by a low pass filter to the load coil in the DSL circuit.

Abstract: A method for controlling a jitter buffer and a communication apparatus implementing the method and functioning as a first node of a communication system, wherein the jitter butter is adapted to buffer a stream of blocks of compressed speech information generated in a second node in the communication system, transmitted to and received in the first node. Blocks of compressed speech information in said stream of blocks are selected (201) according to a predetermined rule based on the current buffering delay of the jitter buffer and at least one characteristic of said blocks of compressed speech information. Predetermined actions aiming at reducing buffering delay in the jitter butter are applied (202) to the selected blocks.

Abstract: A technique prevents multiple multicast forwarders from forwarding multicast packets for a route over a link in a computer network during non-stop forwarding (NSF) recovery of one or more failures in a control plane of a multicast router. The multicast router has a functional infrastructure that allows data traffic forwarding operations to continue throughout a data plane of the router in the presence of a failure and/or software restart to a multicast component, e.g., a protocol independent multicast (PIM) routing protocol, executing in the control plane. Another multicast component, e.g., a multicast forwarding information base (MFIB) executing in the data plane, is configured to prevent multiple multicast forwarders due to routing changes in the network that arise during NSF recovery.

Abstract: A demultiplexing apparatus includes a data obtainment unit to obtain the MP4 file data, and a decoding unit to demultiplex the MP4 file data obtained by the data obtainment unit into pairs of a moov and a mdat and pairs of a moof and a mdat, and decode those pairs pair-by-pair. A content duration specification unit specifies the content total duration based on the content total duration information contained in the moov of the MP4 file data obtained by the data obtainment unit and a playback unit displays the content total duration specified by the content duration specification unit.

Abstract: After completion of a voice-over IP call, for example, first information representing a Layer 3 path of a packet flow of a completed call that has passed through a packet-switched network is created. Second information representing a Layer 2 path of a packet flow of the completed call is also created. One or more selected phone call detail records are retrieved, which are associated with the completed call. Thus, the likely path of a troubled call is determined, and phone call detail records associated with key points in the path are located. The first information, second information, and selected phone call detail records are provided to a user for use in evaluating one or more problems experienced in the completed call.

Abstract: The invention relates to the testing of transmission quality of transmission links in a packet network. According to the invention, the director and responder functionality are made available in a resource server of the packet network. In order to perform a quality test, a connection is set up between the resource server and at least one gateway and potentially between two gateways by a packet-oriented switching center. Test signals are transmitted by the resource server and, after being mirrored at one or two gateways, are transmitted back to the resource server. The broadcast test signals are evaluated for transmission-related reductions in quality, e.g. distortion and attenuation, and the results of this evaluation for different broadcast links are combined in order to obtain information concerning the transmission quality of individual partial links. The invention is advantageous in that it makes complicated and expensive test functions available on centralized resource servers.

Abstract: The present invention provides an IP telephone gatekeeper system and an implementation method thereof, characterized in that two or more individual gatekeepers are connected each other, so as to forming a gatekeeper system that can be regarded as a single gatekeeper system by the controlled gateways, in which the gatekeepers can substitute and backup mutually. A plurality of computer systems are used to realized the cooperation of a plurality of gatekeepers, for breaking through the limit of capacity of individual gatekeeper group and improving the reliability of the whole system, so that backing-up and substituting mutually can be achieved.

Abstract: A channel estimation method for an OFDM transceiver. The OFDM transceiver is configured to derive channel state information (CSI) for a communication channel by processing the preamble of a received OFDM packet. The received packet could be, for example, an unsolicited data packet or a solicited service packet such as an acknowledgement packet. The derived CSI information can then applied to the generation of weighted OFDM packets for transmission over the communication channel. As a result, an improved effective communication channel may be established between this OFDM transceiver and another OFDM transceiver. A channel estimation method of the present invention may be implemented in an access point (AP) or a client terminal (CLT) of a WLAN system. In either case, the improved communication channel can be used, for example, to extend the range corresponding to a selected transmission bit rate and/or to increase the transmission bit rate between the AP and a CLT.

Abstract: For transmitting data between a base station and a transponder, information packets modulated onto an electromagnetic carrier wave each include a header section, a middle section, and an end section. The data are encoded in the middle section using information symbols, e.g. representing digital “1s” and “0s”. The header section of at least the first packet defines the number and unique identifications of all of the symbols that will be used for encoding the data in the middle section of this and/or subsequent packets. This transmission protocol defined in the header section can be varied in subsequent packets to adaptively adjust the transmission rate depending on the existing communication conditions and requirements such as high frequency regulations prescribed by national law. The transmission rate can be considerably increased, in comparison to a transmission rate that would otherwise be necessary for achieving a reliable transmission even under unfavorable conditions.

Abstract: A private mobile communication service system is operated and maintained using an internet protocol (IP) network. The private mobile communication service network has a private base station controller (pBSC) and a base station transceiver subsystem (BTS). The apparatus for operating and maintaining the private mobile communication service includes a wireless system manager (WSM), a hardware alarm collection unit, and a base station controller main processor (BMP). The WSM receives operation/maintenance information, processes the information, creates an operation/maintenance control signal, and transmits the control signal to the pBSC. The alarm collection unit is mounted on the pBSC to collect and output operation/maintenance information, to receive an operation/maintenance control signal, and to generate a reset signal. If operation/maintenance information is received, the BMP ascertains a link address and transmits the link address if it is the WSM.

Abstract: Methods and apparatus for enabling mobility of a node that does not support Mobile IP through synchronization of access point information (e.g., subnet mapping tables) among AAPs are disclosed. In accordance with one embodiment, an authoritative access point (AAP) maintains access point information for all functioning access points (APs) and sends updates for all additions or other modifications to the continually changing access point information to other AAPs. This is accomplished by sending a copy of its local subnet mapping table to the other AAPs. The AAPs receiving the subnet mapping table then update their subnet mapping tables corresponding to the received subnet mapping table.

Abstract: This application is directed to systems and methods for adaptive monitoring of a wireless network with bandwidth constraints. A data unit from a wireless node is received. When a bandwidth constraint is satisfied, the received data unit is buffered. When the bandwidth constraint is not satisfied, the received or buffered data unit is transmitted to a monitoring processor. In some instances, downsampling, data discard and data aggregation can occur during the buffering process.

Abstract: A method for adjusting a transmission rate in the transmission control protocol (TCP) under a mobile ad hoc network environment, including calculating a difference value (Diff) between the current transmission rate (cur_bw) and the previous transmission rate (base_bw), setting up upper and lower thresholds by calculating the standard variation (basebw_var) of the previous transmission rate, and updating the previous transmission rate to the current transmission rate depending upon a comparison result of Diff and the size of the upper and lower thresholds.