Abstract: A high speed switching device including an aggregator, a plurality of intermediate ports, and ingress packet processing resources, is disclosed. The aggregator includes an external switch port operatively coupled to a transport medium, and a demultiplexer that divides an ingress data stream into a plurality of intermediate streams. The plurality of intermediate ports transmit the intermediate streams to ingress packet processing resources. The ingress packet processing resource may include one or more classification devices for parsing, switching or routing, and queueing packets of the ingress stream, prior to transmission to a switching fabric. The switching device optionally includes an egress processor for multiplexing egress data from the switching fabric. Intermediate port traffic may be dynamically modified to minimize load imbalance present in an ingress switching device and or egress switching device.

Abstract: In general, in one aspect, a switching device is described that includes a segmentation unit to receive packets and divide packets having a length greater than a maximum segment length into multiple segments. A plurality of queues associated with a source and a destination stores the segments. A request generator generates requests that include external factors including amount of data contained in the queue and at least some subset of priority and age. A scheduler receives the requests and assigns the requests an internal priority based on the external factors. The scheduler processes the requests for the queues by internal priority in order to generate grants. A framer, responsive to the scheduler, aggregates a plurality of segments for the queues that received a grant to form a frame and to transmit the frame to an associated destination. The frame may contain segments associated with different packets.

Abstract: An apparatus and method for reordering traffic flow templates (TFTs) in a mobile communication system. The apparatus and method include a primary GPRS tunneling protocol (GTP) tunnel for transmitting and receiving packet data to and from a mobile station and one or more secondary GTP tunnels having the same mobile station address as the primary GTP tunnel and each being divided into different TFTs. The TFTs each include different packet filter contents so that the secondary GTP tunnels are separated through TFT packet filtering. A controller is adapted to sequentially perform TFT packet filtering on input packet data for the TFTs, manage statistical data of packet data successfully TFT packet filtered according to the TFTs, and reorder an order of the TFTs by comparing the statistical data of the packet data successfully TFT packet filtered for the TFTs if a preset period expires.

Abstract: The invention relates to a method for reducing the latency in a GPRS network, via which information is transmitted between a data requesting unit, i.e. a client (1), and a data-providing unit, i.e. a server (9), in the form of data packets. In order to transmit the data packets from the client (1) to the server (9), at least one first communication channel (UL-TBF) is opened and then closed. At least a second communication channel (DL-TBF) is then opened and closed for transmitting information from the server (9) to the client (1). A not insignificant latency is thus produced between the request for information and the receipt of information, which can be reduced, according to the invention, by opening the second communication channel (DL TBF) before closing the first communication channel (UL-TBF). A radio channel is thus provided for preventive purposes, for the feedback of the requested data.

Abstract: Improved scalability and performance for label switched routers are provided. Large numbers of interfaces may be readily accommodated. In one implementation, label imposition is divided between ingress and egress linecards so that the interface supporting a given service can be the one to impose any needed corresponding label.

Abstract: Dominated nodes A, B and C equip only with lower layers 1a, 2a and 3a, and upper layers for the lower layers are not equipped. Each of the lower layers 1a, 2a and 3a comprises a preset device, and managing information for managing a communication function of the lower layer is read from the preset device and set to a function device of the lower layer. The dominated nodes A, B and C can execute isochronous transmission without a dominating node equipped with an upper layer for managing the lower layers. The dominating node is not always necessary on an IEEE1394 bus.

Abstract: A method for mobile communication includes arranging a plurality of access points in a wireless local area network (WLAN) to communicate on a common frequency channel with a mobile station, and linking the access points together by cables in a wired local area network (LAN), so as to convey frames of data to and from the mobile station via the LAN. When one or more of the access points receive an uplink signal transmitted over the WLAN by the mobile station on the common frequency channel, the access points send messages over the LAN by interleaving the messages in one or more of the frames of the data, and arbitrate among themselves based on the messages so as to select one of the access points to respond to the uplink signal.

Abstract: A system for controlling configuration settings for mobile data communication devices and services includes a redirection server and a policy generation system. The redirection server detects a triggering event in a host system and in response to the triggering event continuously redirects data items from the host system to a wireless network. Each mobile data communication device receives data items from the wireless network and includes a device configuration stored in a memory location on the mobile data communication device. The device configuration of each mobile data communication device controls one or more functions of the mobile data communication device. The policy generation system receives a policy setting from a user interface and stores the policy setting in a user information record associated with a mobile data communication device.

Abstract: A method and system of the present invention includes the creation and transmission of a MAC header that includes a first MAC header portion and at least two scrambler recovery fields arranged on the two sides (before and after) of a header FEC portion. The invention includes determining whether a scrambler initialization field received at the physical layer was received in error, and if so, evaluating either one of the de-scrambled values of the two scrambler recovery fields in relation to a table to determine a pseudorandom sequence initialization value that corresponds to a given de-scrambled scrambler recovery field value. Once the corresponding pseudorandom sequence initialization value is determined, that value may be used to further de-scramble the data in the data frame to produce a correctly de-scrambled data frame.

Abstract: Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches can provide upstream messages to upstream switching systems indicating to upstream switching systems that the downstream traffic arrived in tact and was properly handled. In one embodiment, the loss or failure of the upstream status message to an upstream switching system, causes an upstream switching system to reroute data traffic around a failed link or failed switch with a minimal amount of lost data.

Abstract: A packet processing device has a search engine module including an associative memory for transferring a packet on the basis of an entry mapping to route information, a first processor taking charge of a pre-search process before a process of the packet to the search engine module, and a second processor taking charge of a post-search process for executing a process of routing the packet on the basis of a search result of the search engine module. In this architecture, the packet processing device further has a table used for transferring and receiving information between the first processor in charge of the pre-search process and the second processor in charge of the post-search processor, and identifying information in a specified field of the table is transferred through the search engine module as a transparent medium.

Abstract: A data transmission and distribution system that includes a transmitter and a receiver. The transmitter transmits a count value associated with a data clock of the transmitter to the receiver over an asynchronous link as part of an information payload that also includes audio or video information. The data clock is synchronously recreated at the receiver using only a system clock associated with the receiver and the transmitted count value.

Abstract: A communications system and method using slave channeling. The method includes the steps of: (a) receiving a request to transmit a message from a first communications resource, the request including a destination address that identifies a second resource; (b) searching within a periodic time frame for an available time slot on a control channel, wherein the second resource is available to receive the message; (c)(1) if the slot is available on the control channel, transmitting the message therein; (c)(2) otherwise, searching for an available slot on a slave channel (d)(1) if the slot is available on the slave channel, transmitting the message therein; (d)(2) otherwise, repeating steps (c)(2)-(d)(2). If the slot is available on the slave channel, the method further includes the steps of: (e) transmitting orderwire information to the first and second communications resources on the control channel; and (f) transmitting the message on the slave channel.

Abstract: A transmitter apparatus and method for reducing PAPR in an OFDM system. The transmitter apparatus performs a masking process on an input signal block using a plurality of mask sequences in an OFDM system, and selects a specific sequence having a lowest PAPR among IFFT-processed results. The apparatus includes a single IFFT for performing an IFFT process on the received signal block, and generating an IFFT-processed sequence; a plurality of shift registers for storing individual bits of the IFFT-processed sequence, cyclically shifting them, and generating the cyclically-shifted bits; a plurality of multiplier groups for multiplying coefficients determined by corresponding mask sequences by the output bits of the shift registers; and a plurality of adders corresponding to the plurality of multiplier groups for adding the multiplied results of the multiplier groups, thereby reducing system complexity and production costs.

Abstract: A system and method are provided for controlling packet header information in a packet communications switch fabric. The method comprises: programming the cell header overhead (OH) field definitions; accepting a packet including a plurality of cells and corresponding cell headers, each cell header including a plurality of overhead fields; defining the cell header OH fields; and, transmitting the packet. Defining the cell header OH fields includes defining cell header OH field location, position, meaning, structure, and length. In other aspects, the method comprises redefining the cell header overhead fields, once they are accepted. For example, the OH field information can be modified, relocated, or an OH field can be added to the cell header. In yet other aspects, the OH field information can be extracted and/or reformatted.

Abstract: In a method for creating expressway for overlay routing, an existing peer-to-peer network is organized into a plurality of zones. A neighboring zone to a destination peer is selected. A plurality of residents of the neighboring zone are retrieved. A candidate peer is selected from the plurality of residents based a physical distance value and an estimated distance value.

Abstract: The invention relates to a method of routing or compressing packets destination address through an electronic routing or compressing device, the packets destination address being n bit packets and having address indicative of a desired destination, the address being classless, the routing device having at least a data base of prefix entries, each of which containing entries corresponding to a desired output data link, the method having the steps of: a) generating an address mask until an entry matching a masked address obtained by making an AND operation between the packets destination address and the address mask, is found in the data; the address mask having a number of bit equal to that of the packets destination address and having, starting from the most significant n-bit equal to 1 and the remaining i bit equal to 0, with 0<=u<=b.

Abstract: Described herein is a method for parallel generating Walsh-Hadamard (WH) channelization codes and Orthogonal Variable Spreading Factor (OVSF) channelization codes, which are channelization codes formed by a plurality of strings of antipodal digits, each having a given length L and being identifiable by respective indices I formed by strings of binary digits, each having a given length N equal to the logarithm in base two of the length L of the channelization codes, the antipodal digits of the channelization codes assuming the values +1 and ?1 and the binary digits of said indices I assuming the values 0 and 1.

Abstract: A bridge has a shared forwarding database and a plurality of ports. The bridge handles data associated with multiple virtual local area networks (VLANs). The shared forwarding database includes static entries for one or more devices which belong to multiple VLANs. Upon receiving data addressed to one of the one or more devices the bridge determines that the data should be source routed by retrieving the static entry from the shared forwarding database. The bridge then selects a bridge port to which the data should be forwarded on the basis of information in the data, such as a VLAN ID field.

Abstract: In an OFDM receiver the complex values of predetermined pilot sub-carriers are compared with expected values to determine pilot distortion values for those sub-carriers. The phases of the differences between successive values are determined, and then the rate at which these phases change with respect to sub-carrier frequency is determined. Data distortion estimates for other sub-carriers can be calculated by interpolation of the pilot distortion values such that the data distortion estimates have a phase which substantially complies with the determined rate.