Abstract: A method for supporting mobility in a wireless telecommunication system which comprises at least one terminal, an access point currently serving the terminal and a plurality of other access points. The access points may be grouped into networks and the terminal is arranged to collect information about available access points. The network names of the available access points are checked by the terminal. The first access point with the best connection attributes of the available access points with the same network name as the currently serving access point is selected. The second access point with the best connection attributes of the available access points with a different network name than the currently serving access point is also selected. One or more connection attributes of the first access point and the second access point are compared. The connection to the second access point is established if the differences between the compared connection attributes fulfil pre-determined conditions.

Abstract: A method and apparatus for maintaining a plurality of sequence numbers in a plurality of header compressed packets associated with an information context is described. Header compressed packets are transferred on a communication link according to a multi-layer protocol having at least a higher layer and a lower layer. If it is determined that one or more header compressed packets has been dropped, a flag is set on the header compressed packets. A sequence count at the higher layer and lower layer may be reduced by a number corresponding to the number of header compressed packets dropped. The sequence number of each of the header compressed packets is checked at the lower layer against the sequence count and renumbered to match the sequence count. If the sequence number and the sequence count match the flag is cleared. The higher layer is a PPP layer and the lower layer is a Physical Layer.

Abstract: A server 3b for controlling a gateway 2 connecting a transport layer and an IP network has the function of accessing a service control point (SCP) 4 via a service control gateway 1a. A server 3 for controlling terminals on the IP network stores information of correspondence between telephone number of a terminal and the IP address. When a signal including number information which requires an access to the SCP is received from a terminal 11 managed by the server 3a, an interrogation request is multicasted to the other servers each having the function of accessing the SCP. A server which has sent a response signal accesses the SCP via the service control gateway to provide an IN service process.

Abstract: A virtual connection queue (VCQx) and a packet queue (PQ) are provided in an ATM switch (20). In the virtual connection queue (VCQx), arriving ATM cells are stored for each virtual connection (VCx). In the packet queue (PQ), at the time where the final ATM cell forming a packet is stored in the virtual connection queue (VCQx), an identifier of the virtual connection (VCx) is stored. A scheduler (26) scans the packet queue (PQ), and based on the identifier in storage of the packet queue (PQ), it selects a virtual connection queue (VCQx) and successively dispatches ATM cells forming a packet in storage of the selected virtual connection queue VCQx. As a result, address space for identifying virtual connections in an ATM network can be used effectively.

Abstract: The present invention overcomes the shortcomings of the prior art by providing a method of encoding bit error rates using a two-tiered system. If the bit error rate is less than a threshold value, the bit error rate is directly encoded in binary into substantially equal portions. However, if the error rate is equal to or greater than the threshold value, the error rate is encoded into equal valued amounts using a common step value. A remainder amount is also formulated to account for any remainders. Multiplying the equal valued amounts that are scaled by a common base value and then adding it all up along with the remainder amount results in a value which is at worst, within 0.2% of the original bit error rate value.

Abstract: A method and a system for providing transparent Quality of Service (QoS) and reducing bandwidth usage in an ATM access network uses that uses VC-merging and delivery of content directly through the access network. Root-initiated join proxy messages sent from a service gateway include a merge-eligibility indicator that prompts an access module to merge content delivered through the access networks into a virtual circuit link (VCL) provisioned for the subscriber. TCP splicing is also supported to further improve overall QoS.

Abstract: A cache system for looking up one or more elements of an external memory includes a set of cache memory elements coupled to the external memory, a set of content addressable memory cells (CAMs) containing an address and a pointer to one of the cache memory elements, and a matching circuit having an input such that the CAM asserts a match output when the input is the same as the address in the CAM cell. The cache memory element which a particular CAM points to changes over time. In the preferred implementation, the CAMs are connected in an order from top to bottom, and the bottom CAM points to the least recently used cache memory element.

Abstract: An integrated circuit processes communication packets and comprises co-processor circuitry and a core processor. The co-processor circuitry is configured to operate in parallel with the core processor. The co-processor circuitry receives and stores the communication packets in data buffers. The co-processor circuitry also determines a prioritized processing order. The core processor executes a packet processing software application that directs the processor to process the communication packets in the data buffers based on the prioritized processing order.

Abstract: The invention relates to an identification method for use in a multiple access communication network wherein a terminal. (Ti) with a predefined identifier (IDi) desires access to the network. The identification method includes distribution of a grant message (G(IDx-IDy)), which defines an identifier range (IDx-IDy), from a controller (C) to a plurality of terminals (T1, . . . , Ti, . . . T16) which includes the terminal (Ti). The method further includes comparing the result (Inv(IDi)) of a reordering in a predefined way by the terminal (Ti) of a plurality of elements (IDi-A, IDi-B, IDi-C, IDi-D) included in the identifier (IDi) with the identifier range (IDx-IDy) in order to decide whether the terminal (Ti) receives access or not, e.g. the reversing of bits of a binary number comparing with the identifier range.

Abstract: An apparatus and method for detecting concatenation of payload data for an communication circuit is disclosed, wherein the payload data is dispersed over a first integrated circuit and one or more subsequent integrated circuits. The method and apparatus include determining whether each of the one or more subsequent integrated circuits have all channels therein designated as concatenation slaves, and communicating the determination to the first integrated circuit, the determination indicating that the one or more subsequent integrated circuits. According to an embodiment, the method and apparatus further include coupling the first integrated circuits to the one or more subsequent integrated circuits.

Abstract: A network router is tested for operation according to a given network protocol, by coupling the router under test (RUT) to a test host device and arranging the device to simulate operative test network topologies which include router nodes, network nodes, and edges between the nodes. The device exchanges information packets with the RUT for each of a number of successive test network topologies. Each successive topology is determined randomly by inserting or deleting an edge or a node to or from a prior test network topology in a probabilistic manner. Operation of the RUT under the given protocol is evaluated based on the exchanged information packets. A judgment, e.g., a fault or a no-fault condition, is rendered by the host device.

Abstract: Forward performance monitoring cells are inserted into a processing queue coupled to an access controller. A plurality of ATM cell input sources are coupled to the controller. Each source supports a plurality of ATM connections. The controller controllably admits cells from the input sources into the queue. Before a forward performance monitoring cell corresponding to a particular ATM connection is inserted into the queue, an interim cell corresponding to that connection is first transmitted to the controller, which controllably admits the interim cell into the queue. The queue is monitored to detect the presence of the interim cell in the queue, without interrupting maintenance of counts for the respective ATM connections. Then, while the interim cell remains within the queue, the count for the ATM connection corresponding to that interim cell is stored in the interim cell, thereby converting the interim cell into the desired forward performance monitoring cell.