Abstract: A pager (20) for operating within the communication environment of a cyclical frame based synchronous selective call system. The pager (20) has a receiver (22) for receiving selective call signals, a controller (25), a memory (26) to store signal parameters, a demodulator (27) and a decoder (28). In operation, receiver (22) processes selected frames within a selective call signal transmitted on a channel. During such operation, controller (25) determines whether to control receiver (22) to continue monitoring the channel or to scan for or select another channel to monitor for other selective call signals. A count of missed selected frames of a selective call signal is compared with a threshold count. This threshold count is based upon one of the signal parameters indicative of the selected frames. Controller (25) also schedules non-selected frames for processing when this signal parameter is greater than a predetermined number.

Abstract: A multilevel session management protocol is provided to support communications mobility in a telecommunications system. A session is separated into two independent layers—a terminal session layer and an application session layer. A session management agent is implemented as a module operating locally in a wireless terminal. A second session management agent is implemented as a module operating remotely in the Internet. Any session management agent module can communicate with another session management agent module by use of the session management protocol. The two session management agent modules use a multiplexed TCP connection for conveying TCP data traffic therebetween. As such, the session management protocol can be used with any application that uses an Internet TCP as a transport protocol.

Abstract: Inter-class schedulers for digital link systems provide high efficiency utilization of limited bandwidth by employing queuing techniques referred to as Statistical Priority Guarantee Queuing (SPGQ) and Generic Cell-Rate Algorithm Priority Guarantee Queuing (GCRA-PGQ). SPGQ “elevates” the priority of otherwise low-priority classes under prescribed circumstances in accordance with a statistical process. The SPGQ scheduler determines whether a number within a range produced by a uniform random number generator lies within a sub-range proportional to the programmed statistical guarantee for a given class. If the number lies within the sub-range associated with a given class, then the priority of that class is elevated to a higher priority when both are eligible to transmit. The GCRA-PGQ scheduler operates as a strict priority mechanism until a class requires bandwidth in excess of a GCRA “window” or threshold for that class.

Abstract: Methods and systems for determining the number of active connections in a node in a communications network are described. The node determines the number of active connections by sampling a list of recently active connections in the node when the node receives a packet, and estimating the number of active connections based on whether the packet is associated with a sampled entry in the list. Each entry in the list includes a connection identifier and a count. The node stabilizes the buffer occupancy by estimating the number of active connections in the node based on a sampling of the list of recently active connections when the node receives a packet, determining a probability for discarding the packet based on the estimated number of active connections and the recent buffer occupancy, and discarding the packet according to the determined probability.

Abstract: An apparatus and method for generating a pilot signal for hard hand-off. A pilot signal generator of a base station for generating an identifying pilot signal corresponding to a target base station to perform inter-frequency hard hand-off in the code division multiple access cellular system comprises an intermediate frequency amplifier/divider, a service RF path unit and a RF path unit. The IF amplifier/divider divides the amplified IF signal transferred from a digital MODEM. The service RF path unit up-converts a first portion of the divided signal into a desired radio frequency and transmits the up-converted RF signal for actual communication and the RF path unit up-converts a second portion of the divided signal into a desired RF and transmits the up-converted RF signal as an identifying pilot signal corresponding to a target base station for a hard hand-off.

Abstract: A high-speed packet data network more efficiently controls data flow through the network using forward and/or backward explicit congestion notification messages (FECN and BECN) to throttle data transmission between network elements. The network includes a router for initiating a data flow control comprised of a receiving protocol stack, a controller and an operating system. The router controller is programmed to respond to receipt of a congestion message (BECN) from a fast packet network such as a frame relay or cell relay network to generate a pass through packet message requesting the opening of a virtual data flow control channel between layer N and layer N+2, where typically layer N is layer 2 of a frame relay protocol and layer N+2 is layer 4 of a TCP protocol. Layer 4 may refuse to open the channel, but once a channel is opened, data flow control may be initiated between destination intelligent terminals when congestion is sensed in the fast packet network.

Abstract: A circuit coupled to receive a sequence of signals is designed with a multiplication circuit (416, 420) coupled to receive a first signal, a second signal and a complex conjugate of the first signal. The second signal follows the first signal in time. The multiplication circuit produces a first product sequence of the first signal and the complex conjugate and a second product sequence of the second signal and the complex conjugate. A summation circuit (424, 426) is coupled to receive the first product sequence and the second product sequence. The summation circuit produces a first sum of the first product sequence and a second sum of the second product sequence.

Abstract: In a radio telecommunication system, the performance of a mobile unit can be significantly improved during a hand-over procedure by reusing existing security associations that correspond to the mobile unit. By reusing existing security associations, a mobile unit can begin secure communications immediately following the hand-over. Otherwise, and in accordance with conventional practice, the mobile unit will have to undertake the time consuming task of renegotiating the required security associations, before it can begin transmitting and receiving secure communications.

Abstract: A system includes a modem which receives a burst of a time division multiple access (TDMA) signal. A burst mode controller, connected to the modem, is operable to detect a unique word in the burst. If the unique word is not detected, the burst mode controller loads a predetermined bit pattern into a channel identifier field of the burst. The predetermined bit pattern indicates that a payload field of the burst contains voice data.

Abstract: For data packet communication between a plurality of nodes via a communication network, a data communication interface device is used in at least one of a transmitting end and a receiving node. The interface device includes a plurality of interface chips each including a storage section of a predetermined capacity for buffering a data packet to be transmitted or having been received via the communication network, and a control section for controlling each of the interface chips to thereby control transmission or reception of the data packet to or from the communication network. The number of the interface chips to be connected to the control section is optionally selectable in such a manner that an overall buffer storage size in the interface device can be freely adjusted by just increasing or decreasing the number of the interface chips.

Abstract: A three stage method and apparatus for performing dynamic time slot assignment on both 2-bit and 8-bit information is disclosed. In the first stage, 2-bit packets undergo a 2-bit time slot assignment prior to being sent to a conventional time slot interchanger. 8-bit information, however, is passed to the time slot interchanger without undergoing the 2-bit time slot assignment. The time slot interchanger performs time slot assignment on the 8-bit information to place the information in the appropriate outgoing DS0 time slots. In the second stage, the time slot interchanger places the 2-bit information into a fixed sequence of 8-bit time slots and passes these time slots to a packer. The prescribed time slots are established such that each time slot represents an assigned 2-bit location within a specific 8-bit time slot. The packer then combines the assigned time slots to create a serial stream of 8-bit time slots where each time slot contains up to four dynamically assigned 2-bit packets.

Abstract: Port cards in an ATM switch store parameters for virtual channel connections (VCCs) and virtual path connections (VPCs) in separate areas of a virtual connection parameter table (VCPT), the areas being defined by a VCC pointer and a VPC pointer. Also, a number of “free lists” are used to identify unused single locations (for VPCs) or chunks of locations (for sets of VCCs) that are available for re-allocation. Different free lists are used for different-sized sets of VCCs, i.e., sets configured to use different maximum numbers of VCI bits. When a new VPC is created, a VCPT location identified by an entry in the VPC free list is allocated, if such an entry exists. Otherwise a VCPT location is allocated by advancing the VPC pointer. De-allocation of a VPC entry proceeds in reverse order, i.e., the VPC area is shrunk by backing up the VPC pointer if possible, and if not the de-allocated entry is placed on the VPC free list.

Abstract: A system and method of transferring data to and from a mobile station (MS) in a cellular telecommunications network. When the MS originates a data transmission, the MS simultaneously seizes additional voice channels or control channels from the serving cell or adjacent cells, fills time slots with data packets, and asynchronously transmits the data packets over the plurality of channels in order to increase the data transfer rate. For data calls terminating at the MS, the serving mobile switching center (MSC) reserves a plurality of channels having sufficient signal strength to maintain a connection with the destination MS. The MSC informs the involved base stations that an asynchronous transmission is to be made to the MS. The MSC then assembles the data packets and starts transmission through the involved base stations to the MS over the reserved channels. The MS assembles the packets in numerical order and delevers the data to the user.

Abstract: Method and apparatus are provided for guaranteeing that transmit cell available signals transmitted from an ATM-PHY interface device conform to a communication protocol. A previous transmit cell available signal from the previous clock cycle is stored and a transmit status signal and a transmit enable signal for the current clock cycle are sampled. One of the transmit status signal and the previous transmit cell available signal are selected as the new transmit cell available signal based upon the state of the transmit enable signal and the transmit status signal.