Abstract: A cell flow synchronization establishing system of an ATM access system, capable of establishing synchronization of cell flow between a mobile station and base stations at the time of hand-off process, is provided. First buffer control unit is provided in the ATM switching station, and second buffer control unit is provided in the mobile station. The first buffer control unit reproduces cell stream to be transmitted by guaranteeing orderness of ATM cell between the first buffer control unit and the second buffer control unit and buffer clear processing is carried out based on predetermined synchronization establishment processing sequence before and after occurrence of handoff.

Abstract: A wireless local loop communications system includes a digital subscriber line access multiplexer connected to a plurality of network terminals wherein each network terminal provides multi-session local loop access for user communications. A shared point to multi-point wireless communications link connects the digital subscriber line access multiplexer to the plurality of network terminals. Regulation of user and session access to the shared wireless communications link is effectuated by a session dispatcher functionality. That functionality utilizes a dispatcher at each network terminal that operates responsive to received commands to regulate user and session access to the shared wireless communications link.

Abstract: A cellular asynchronous transfer mode packet network and a method for transferring packet data in the same is disclosed. A virtual circuit is established between a serving radio network controller and a target radio network controller, or between the serving radio network controller and a target packet data node. Also, individual packet paths are established between the serving radio network controller and the target radio network controller or between the serving radio network controller and the target packet data node through a mobile packet router. Individual data blocks of the packet data or packet sessions are multiplexed/demultiplexed over the virtual circuit on the basis of a service specific convergence sub-layer protocol. The multiplexed/demultiplexed data blocks are routed according to authenticated destination identifiers.

Abstract: Disclosed is a channel allocation method on performing a data communication in a wide band wireless multi-media communication system, which allocates selectively reserved time slots or contention time slots, according to the quantity of data to be sent. In the method, contention time slots are used for sending data if the quantity of data to be sent is smaller than a critical value, or reserved time slots are used if the data quantity is greater than the critical value.

Abstract: The present invention relates to a method of recovering from a processor fault in a mobile communication network node provided with a plurality of processors. In use, connections are established between the network node and mobile stations for packet data communication between the network node and the mobile station. The connections are classified into priority order on basis of predefined classifying parameters. Working condition of at least one of the processors of the network node is monitored, and in case of detecting a processor fault, user plane connections are relocated within the network node from the faulted processor to another processor in accordance with the classified priority order of the connections. The invention relates further to a network node.

Abstract: The invention relates to telecommunication networks and particularly to mobile networks using Asynchronous Transfer Mode (ATM) transmission systems. The invention also relates to the control of mobility and call control functions in ATM systems. According to the invention, a network element (MSC/BSC) of a telecommunication network, such as a mobile network, which in a conventional telecommunication network architecture ensures the switching of circuit-switched connections, is provided with an ATM switching function. ATM switching functions are controlled with the same call and switching control operations (31) that are conventionally used e.g. for the control of a TDM switching field (32) in a PLMN network element. In a minimum implementation, an ATM switching field (301) provided with a suitable control interface (30) is simply arranged in place of or parallel with the TDM switching field. The switching network element thus becomes an ATM network node of a physical or a logical interface layer.

Abstract: A method of dynamically controlling congestion in a wireless communication system. The method generally comprises the steps of: (a) the medium access control layer detecting congestion; (b) the medium access control layer communicating a control message with the data link control layer indicating a congested state; (c) in the congested state, the data link layer placing frames received from a higher layer into a data link layer queue and suspending frame transmission to the medium access control layer; and (d) upon receipt of a control message indicating an uncongested state, the data link control layer sending frames to the medium access control layer.

Abstract: A method for optimizing the use of wireless peripheral devices if described. The optimization is achieved by monitoring the signal integrity of each wireless device operating within the computer system. When the signal integrity of a wireless device degrades due to the interference from other wireless devices operating within the computing system, beyond certain predefined optimal range, the communication parameters of each wireless peripheral devices are adjusted reiteratively to obtain the most efficient configuration for optimal throughput and optimal energy efficiency for each wireless peripheral device. The configuration constantly changes within the environment based on the interference from internal and external wireless devices.

Abstract: The present invention relates to a system and method for reliably transmitting data over wireless communication channels. The invented system 10 comprises a transmitting device 12 having an error control coding circuit 20 and an interleaver circuit 22 in communication with each other. The invented system 10 also includes a receiving device 14 having an error control decoding circuit 26 and a de-interleaver circuit 28 in communication with each other. The transmitting device 12 and the receiving device 14 communicate over a wireless communication channel 16. The error control coding circuit 20 applies an error control code to the data before it is transmitted over the communication channel 16. The data is also interleaved prior to being transmitted. After transmission over the communication channel 16, the data is de-interleaved and any transmission errors are detected and corrected.

Abstract: The present invention relates to a telecommunications node (1a) that is able to handle IP-traffic and to terminate telecommunications traffic, which node includes means for simple and effective load distribution between resources (40-43) in the node. The inventive telecommunications node (1a) includes board internal IP-subnets (45, 46) with associated subnet interfaces (45a, 46a) having interface addresses and a distributed forwarding engine structure where every device board (10, 11a, 12a) associated with the handling of IP-traffic is provided with a forwarding engine (20-22). Each board internal IP-subnet (45, 46) is associated with at least one predetermined node resource (40-43) for processing telecommunications traffic, thereby enabling a resource manager (49) to perform load distribution by ordering a destination address for a selected stream of IP-traffic, which is to terminate in the node, to be based on the interface address associated with a selected board internal IP-subnet (45, 46).

Abstract: An ATM network comprises a central call processor, and one or more remotely located ATM bridge nodes, whereby the call processor is separated from the switching fabric in the ATM bridge nodes. A plurality of preestablished permanent virtual paths are defined within the ATM bridge nodes. In setting up a connection, a source user terminal communicates with the central call processor to obtain the virtual path identifier associated with the virtual path to one or more destination user terminals. The user data is segmented into one or more cells that incorporate a header containing the appropriate VPI. The ATM bridge node extracts the VPI from incoming cells, and then directs these cells to the appropriate output ports in accordance with a routing table. The instant invention provides for improved network efficiency and upgradability, and is particularly suited to satellite based ATM networks.

Abstract: A downlink orderwire integrator (63) and separator (81) for use in a processing satellite (12) and a user terminal (14) in a satellite based communications system (10) is provided having a formatter (64), a cell switch (72) and a cell sieve (80). The formatter (64) generates orderwire cells (54) with each orderwire cell (54) having a header (60) and a body (62). The cell switch (72) receives the orderwire cells (54) from the formatter (64) and traffic cells (56) from at least one uplink (16) and arranges the orderwire cells (54) and the traffic cells (52) in at least one frame (48) to transmit on at least one downlink (18). The frame (48) includes a fixed custom frame portion (42) and a fixed traffic portion (50) that contains both the traffic cells (52) and the orderwire cells (54).

Abstract: A method and apparatus for providing frame acquisition and synchronization for ATM transmissions in terrestrial wireless and satellite systems. During acquisition (1020), the transmitter (15) fills the entire payload of a frame with a pattern that is used by the receiver (18) to determine the location of the frame boundary. As to synchronization (1020), a procedure is utilized for using frame sequence number field in the header and Reed-Solomon decoding result (1012) for correction and maintaining frame synchronization.

Abstract: An ATM switch 11 is equipped with a location manager 100 or a location server 200, which realizes the mobility supporting function of a terminal station. The location manager 100 or the location server 200 is equipped with a switching control unit 130 for performing a routing control to take all of data inputted to the ATM switch 11 in, an APCP processing unit 110 for translating a signalling signal into an APCP message, a SIG+M processing unit 120 for terminating a signalling, translating the APCP message for a communication with an access point into a SIG+M signal, which is a signalling signal added with the mobility supporting function of the terminal station, and executing the SIG+M signal and an ATM cell header conversion unit 140 for converting an ATM cell header of the SIG+M signal on demand.

Abstract: A system and method for combining multiplexing and modulation schemes to deliver high and low bandwidth services over a wireless link. The system includes a base station (BTS) with a transmitter for point to multipoint communications to a plurality of network interface units (NIUs) located at customer locations within a geographic area serviced by the base station. In addition to receiving downstream communication from the BTS, each NIU is equipped to communicate in a point to point manner with the BTS. According to the invention time division multiple access multiplexing (TDMA) and quadrature phase shift key (QPSK) modulation is employed for low bandwidth services and frequency division multiplexing (FDM) and quadrature amplitude modulation (QAM) is used to supply high bandwidth services.

Abstract: Standard cells and AAL2 cells are processed by a single AAL terminating unit to reduce whole circuit scale of a radio communication system. An AAL identifying unit 3 determines whether an ATM cell is a standard cell or an AAL2 cell. When the ATM cell is a standard cell, the cell is transferred to the AAL terminating unit 7 as it is when the ATM cell is an AAL2 cell, the cell is assembled and to produce a plurality of ATM cells each of which corresponds to one of the short cells in the AAL2 cell and transferred to the unit 7. The unit 7 determines an AAL type of the ATM cell and processes then according to the AAL type.

Abstract: A method of transmitting non-real-time data over a wireless link from a terminal (2) to an ATM switch (6) comprising the steps of generating in the terminal (2), a plurality of ATM cells derived from a protocol data unit, marking the last ATM cell of the protocol data unit, sequentially transmitting the ATM cells over the wireless link, determining in the ATM switch for each transmitted cell, whether that cell contains an error, and sending an error message back to the terminal if an ATM cell is determined to contain an error, the terminal (2) being arranged on receipt of the error message, to cease transmitting any remaining ATM cells of the protocol data unit from which the erroneous ATM cell was derived. Also, an ATM protocol stack for wireless ATM communications in which the physical layer below the ATM layer, has been adapted to include a radio access layer, the radio access layer including a medium access control protocol layer and a partial packet discard mechanism.

Abstract: Methods, apparatuses and systems are provided for use in a wireless routing network. One apparatus, for example, includes an adaptive antenna that is configurable to receive a transmission signal from a transmitter and in response transmit corresponding outgoing multi-beam electromagnetic signals exhibiting a plurality of selectively placed transmission peaks and transmission nulls within a far field region of a coverage area. The adaptive antenna may also be configured to selectively receive at least one incoming electromagnetic signal directed through the coverage area. The adaptive antenna includes at least one antenna array and logic. The antenna array has a plurality of antenna elements. The logic is operatively coupled to the antenna array and configured to selectively control the placement of the transmission peaks and transmission nulls within the outgoing multi-beam electromagnetic signals.

Abstract: The present invention is a method and apparatus for processing data packets in the outbound module of a space-based cell switch. The present invention uses an expanded set of queuing parameters to determine an output queue in which to store each data packet. The method includes the steps of selecting an expanded set of queuing parameters (202), establishing several output queues (204) based on combinations of the expanded set of queuing parameters, receiving data packets in a communications uplink (206), examining the header portion of each received data packet (208, 210 and 212), determining an appropriate output queue in which to store the data packet (214 and 216), and switching the received data packets to that appropriate output queue (218). The present apparatus includes several input modules (102), a switch control output (114) connected between the input module (102) and a switch fabric (104), and a several output modules (106) connected to the switch fabric (104).

Abstract: An information distribution system with an architecture that facilitates efficient distribution of a plurality of information asset data to a plurality of different requesting users substantially simultaneously. Fundamental components of the system include a plurality of mass storage devices that store information assets, mass storage device interface units, a switching unit, a centralized control unit and a gateway to the users. Information transfer between various components of the system is accomplished through a plurality of communication channels according to a circuit switching protocol. According to one embodiment of the invention, a plurality of communication channels are provided between the mass storage devices and the switching unit such that information asset data may be transferred, in substantially a single format and according to substantially a single protocol, from the mass storage devices directly through the switch and to the requesting user.

Abstract: In a network structure according to the invention for realising a radio extension of an ATM network, only part of the switches of the ATM network are provided with functions required for supporting wireless terminals. In between these wireless-specific switches, there are provided individual connections in order to distribute control and management information. The wireless-specific switches and the individual connections therebetween form a parallel, tree-like PNNI node structure in relation to the rest of the ATM network, so that the wireless-specific switches belong, in addition to said PNNI node structure, also to the node structure of the regular ATM network. With a structure like this, the additions required by the support of wireless terminals in the PNNI protocol remain very slight.

Abstract: The present invention as disclosed hereby is to provide a wireless base station by which it is possible to readily extend the wireless base station in the number thereof independently of the number of ports of the ATM transmission lines prepared on a wireless network control apparatus.

Abstract: A radio communications system (10) having a mobile station (30) and at least two base stations (13, 14). ATM radio channels (31, 32) are provided between the remote station and the base stations. Each of the ATM channels supports communication though ATM cells over a common frequency band. When handoff conditions are met for a handoff from the first base station to the second base station, a second virtual path identifier and a second virtual connection identifier are selected for a connection between the second base station and the remote station.

Abstract: The present invention seeks to provide a more reliable method for transmitting data packets over a communications link, such as a wireless link. A method of error correction for a cell based transmission protocol is provided wherein the cells are arranged to form multi-cell frames wherein for each frame the header fields are reduced in size and; wherein idle cells provide space for error correction within the payload of the multi-cell frame. Preferably, an algorithm is provided which is operable to evenly distribute these idle cells in time. The separate coding of the headers and payloads can enable at least some payload errors to be removed by reference to the header field. Where idle cells are present in the frame, the presence of ATM idle cell headers in the header field of the frame is used to enhance the effectiveness of the coding applied to the payload field.

Abstract: The invention includes an apparatus and a method for wirelessly transmitting and re-transmitting sub-protocol data units between a transceiver and a subscriber unit. The method includes the transceiver receiving standard data units and forming sub-protocol data units. The transceiver transmits a plurality of sub-protocol data units to the subscriber unit. A subset of the plurality of sub-protocol data units includes an acknowledge request indicator. The subscriber unit receives the sub-protocol data units. The subscriber unit transmits back to the transceiver a response to the acknowledge request indicator, indicating which sub-protocol data units were successfully received by the subscriber unit.

Abstract: An access network for mobile terminals has a switching circuit (VCX) connected to at least one other external network and to a local access network (RLA) which has a number of radio terminals (BR) for providing communication with mobile terminals (MT). Set-up and release protocols provide for signaling channels and user channels between switching circuit (VCX) and a mobile terminal (MT). Security protocol (SSCOP) provides for the channels implemented by exchanging signaling messages at the level of switching circuit (VCX) and mobile terminals (MT). An adaptation server (ARX) intercepts the messages sent by the signaling protocols and implements the intercepted messages. Management protocols of the local access network (RLA) oversee set up and release of the signaling channels and the user channels and reserves corresponding radio resources for the signaling channels.

Abstract: A fixed wireless point-to-multipoint distribution network for providing seamless communication coverage to plurality of subscribers that includes a plurality of base stations for providing wireless access to said subscriber; each base station having connectivity to one another on a first network layer via at least one of a number of IP and/or ATM switches, called IDCN switches; each IDCN switch having connectivity to another over a second network layer via a transport ring thereby enabling one user to communicate directly with another user in said first network layer, or externally of said first network layer via one of said IDCN switches. An integrated data centric network is provided that integrates voice, data and video services into a single network, defines user services by the end user by providing middleware to enable the end user to develop services and applications; and provides a carrier grade service with distributed networking and services.

Abstract: In an ATM transmission system in which a plurality of ATM cells are grouped to a packet with an end of ATM cell having an EOP (End Of Packet) flag, a transmitting station comprises a transmit buffer for storing temporarily ATM cells to be transmitted, a transmit cell process means which discards all the ATM cells in the group in case that a NAK response indicating loss or wrong reception of an ATM cell is received from a receiving station, and an EOP cell generator for transmitting an EOP cell which has said EOP flag in stead of the discarded ATM cells. As no ATM cell in a packet is transmitted after an erroneous ATM cell is detected, no useless ATM cell which would be discarded in a destination terminal equipment because of an erroneous ATM cell occupies a transmission line when an erroneous ATM cell is detected, and traffic is saved.

Abstract: A method of establishing a supplemental channel (SCH) to provide burst timing for high-speed data transmission in a mobile communication system is disclosed. In the SCH establishing method, a source base station transceiver determines that a traffic burst exists and sends a target base station transceiver a burst request message. The burst request message includes forward and reverse burst timing information and channel use time information, which is determined in consideration of a discontinuous transmission (DTX) mode, in order to reserve necessary resources, when a large amount of high rate data is to be transmitted. Then, the target base station transceiver sends the source base station transceiver a burst response message including information about resources committed to the traffic burst.

Abstract: A base-station host system achieves high-speed routing to reduce a burden on a controller which carries out a routing process, and receives a cell containing a plurality of packets (an ATM cell of AAL Type 2) from a base station. A cell containing a plurality of packets is transmitted from the base station to the base-station host system. A packet extracting unit extracts the packets from the received cell. A cell generating unit generates an internally processable cell based on information carried by the payload of a packet. A switch unit switches internally processable cells depending on routes thereof. For reverse communications, internally processable cells are sent from the switch unit to a packet generating unit. The packet generating unit generates packets based on information carried by the payloads of the internally processable cells.

Abstract: A method of setting up a connection between two parties over a radio ATM network is provided. A remote, off-board agent, called the proxy signalling agent, is used to provide signalling and call control functionality for one or more network element(s). In order to receive and transmit signalling messages on behalf of the network element, a bi-directional virtual channel is provisioned, one for each port, from the network element to the proxy signalling agent. For each network element under the control of the proxy signalling agent, the proxy signalling agent provides signalling stacks, one for each of the elements ports, along with call admission control, routing and VCI allocation functions. This avoids the need for the network element to perform these functions. The proxy signalling agent controls the network element's connection tables using a simple and low-level control protocol to effect changes in the connection state at that element, rather than using UNI.

Abstract: An apparatus and a method of communicating a set of user data in an ATM network-based mobile communication system are disclosed. To transmit the set of user data, N internal AAL packets are generated by adding an internal AAL packet header to each of N data subsets of an original set of user data. The internal AAL packet header includes a sequence number of each data subset. Next, one or more internal AAL cells are generated by multiplexing the internal AAL packets. Then, the original set of user data is restored by demultiplexing the internal AAL packets, included in the internal AAL cells. Thereafter, M AAL2 packets are generated by adding an AAL2 packet header to each of M data subsets of the restored set of user data. And finally, one or more AAL2 cells are generated by multiplexing the AAL2 packets. As a result, the set of user data is transmitted in the system in a much more efficient manner. Therefore, the data traffic rate in each part of the system is greatly enhanced.

Abstract: A hand-off notifying and controlling system of a mobile node is disclosed including a mobile node (MN) that transmits a registration request message. An old foreign agent (FA) provides a mobile IP service to the MN, before the hand-off takes place. A new FA provides a mobile IP service to the MN, after the hand-off takes place. A home agent (HA) generates and transmits a registration release message to the old FA, upon receipt of the registration request message from the MN via the new FA. When the MN is handed off, since the HA deletes the previous registration of the MN, registered in the old FA, the waste of memory resources and registration lock dead can be simply and effectively reduce or solved.

Abstract: Method and system for performing an optimised hand over between a first base station BS1 and a second base station BS2, wherein a mobile terminal MT requests a hand over. During hand over the loss of data has to be avoided and a fast retransmission should be provided. Further the hand over is preferably under the control of the mobile terminal MT initialising the hand over. The invention therefore provides a method and a system where an information stream is divided into segments and where each segment is numbered. The numbered segments are transmitted via the first communication path P1 and via the first base station (BS1) to the mobile terminal MT and at the same time they are stored on the second communication path P2 to the second base station (BS2), which is the one where the hand over is requested to. After the execution of the hand over one numbered segment identified by the exact number is requested via the second communication path P2.

Abstract: The invention provides a communications network utilizing a multi-beam input/multi-beam output fixed-sized data packet switch with configurable output packet buffering located in a satellite. The satellite communications network system according to the invention handles fixed size data packets and includes ground based stations (terminals) for transmitting an up-link communication signal representing the fixed sized data packets and for receiving a control signal, a satellite for receiving the up link communication signals from the ground based stations and for transmitting down-link communication signals, and a ground control station for transmitting and receiving control signals to the satellite, whereby the satellite receives and transmits the control signals to the ground based stations.

Abstract: The invention provides for the transmission IP data over an ATM switch architecture in a communications network. The invention provides for a distributed communication system that includes a user terminal for generating and processing user data in a connectionless format, a relay node communicatively connected to the user terminal, the relay node supporting a connection-oriented operation functionality and a gateway communicatively connected to the relay node for managing the interface between the user terminal and the relay node.