Abstract: Techniques for fast cell search, selection and reselection for wireless communication systems such as OFDM or OFDMA communication systems. In various implementations of the described techniques, downlink subframes from base stations to mobile stations are designed to include information in form of preambles or post-ambles in one or more downlink subframes to facilitate cell search at receiving mobile stations at high speeds. The described preambles and post-ambles may also be used to improve the accuracy of signal synchronization in time and frequency.

Abstract: The present invention concerns a wireless telecommunication system including at least a base station intended to communicate with terminals over bidirectional communication channels, each channel supporting frames being divided into downlink timeslots and uplink timeslots, each downlink timeslot including a number of symbols intended to be transmitted to at least a terminal, a terminal after having received all the symbols included in a downlink timeslot followed by an uplink timeslot transmits other symbols over said uplink timeslot with a time delay depending on the distance between said terminal and said base station so that the so transmitted symbols are received by said base station at a time separated from the end of the transmission by the base station of the downlink timeslot by a predefined guard period constant whatever said distance, and the base station transmits at least a supplementary downlink symbol during the guard period to terminals that can receive said at least supplementary downlink symb

Abstract: A system and method for selecting a route, from within the set of network routes between the source and destination end-points, for retransmission of information initially sent via a suspected failed route such that the selected route has a minimum number of network components in common with the suspected failed route. In one aspect, the routes between source and destination end-points are grouped into a route set and placed in order in a circular list by the destination end-point. When the source end-point deems it necessary to retransmit information sent via a suspected failed route, it selects the next acceptable route following the suspected failed route from the circular list. The circular list order is determined such that adjacent routes have few common network components.

Abstract: Disclosed is an adaptive method for training a source synchronous parallel receiver. The adaptive method for training, or aligning, parallel data channels permits a parallel communication receiver to adaptively adjust the timing of data channels to align the data channels with a frame channel and achieve a source synchronous signal for the parallel data channels. Further, portions of the frame channel training pattern may be used because possible time shift accuracy error is accounted for between the communication channels and a determination is made as to which portion of the frame pattern is currently being received. The data channels are then aligned appropriately.

Abstract: Method, systems, and computer program products for identifying the application-level protocol of a signaling message are disclosed. According to one method, a message copied by a network monitoring system is received. The service indicator in the message is examined to determine whether more than one application-level protocol is possible. If more than one application-level protocol is not possible, the application-level protocol is identified based on the service indicator. If more than one application-level protocol is possible, additional message attributes are individually examined to determine whether identification of the application-level protocol is possible based on each attribute. The application-level protocol is identified based on the first attribute for which identification is determined to be possible.

Abstract: A radio communication device includes a beacon reception unit extracting a frame from a received beacon and a frame judgment unit judging whether the extracted frame is one requiring data transmission/reception or one giving notice of a collision with a beacon of another network, a frame constructing unit used when the frame judgment unit has judged that the frame is a collision notification, generating a frame for relaying the collision notification and a movement notification to a new beacon transmission period, and a beacon transmission instruction unit instructing transmission of the frame at the beacon transmission timing. Accordingly, since these notifications can be relayed, all radio communication devices of the same network can move to a new beacon transmission period while avoiding a collision with a beacon from a radio communication device of another network.

Abstract: An apparatus, e.g., in a network edge device, a method, and a software program product for synchronizing two or more redundant media streams, e.g., MPEG video streams. The method includes receiving network packets encapsulating redundant media streams representing the same media program, buffering the received streams, learning a program identifier for the media program, searching the packets of the redundant streams for synchronization points defined by a plurality of parameters of stream packets, synchronizing the redundant streams based on the comparison, and providing a single stream as an output stream.

Abstract: A network provides fault tolerant network routing by identifying root nodes that provide cover against a particular type of fault. Nodes then route copies of packets through these root nodes such that an occurrence of the particular type of fault will not disrupt delivery of the packets.

Abstract: A radio communication device is tested by forwarding relevant signal characteristic data derived at the physical (PHY) layer to the media access control (MAC) layer for processing, analysis and feedback to the radio circuit to improve performance. The relevant signal characteristics are forwarded to the MAC within (appended to) a data packet. Thus, the relevant signal characteristic is forwarded to the MAC along an existing data path (a path originally designed to transfer the receive frame only, but now transfers the combined receive frame with the attached radio characteristic). The radio characteristic may be used for testing and/or tuning the radio circuit. In one embodiment, the radio characteristic is a frequency domain representation of a received signal. The radio is tuned based on a channel estimate derived from comparison of frequency domain representations of transmitted and received signals.

Abstract: Disclosed is a method for partitioning resource spaces, and allocating physical channels and power in an OFDMA-based cellular system. A resource within a slot is partitioned into resource spaces in common in a plurality of adjacent cells, and the partitioned resource spaces are partitioned into resource sets according to sizes of physical channels in the adjacent cells. The physical channels classified by predetermined characteristics are respectively assigned to the partitioned resource sets within the resource space. Further, the resource space for transmitting traffic channels between two different cells is partitioned into resource spaces so that the traffic channels in the same subspace may be collided with each other, and a power control is applied between the collided channels to control the interference from the adjacent cells.

Abstract: A method is provided for packet flow control for a switching node of a data transfer network. The method includes actively managing space allocations in a central queue of a switching node allotted to the ports of the switching node based on the amount of unused space currently available in the central queue. In a further aspect, the method includes separately tracking unallocated space and vacated allocated space, which had been used to buffer packets received by the ports but were vacated since a previous management update due to a packet being removed from the central queue. Each port is offered vacated space that is currently allocated to that port and a quantity of the currently unallocated space in the central queue to distribute to one or more virtual lanes of the port.

Abstract: Methods and systems for managing system resources in a data transmission system are disclosed herein. An adaptive packet inactivity timer can be associated with the data transmission system, wherein the adaptive packet inactivity timer dynamically changes a behavior thereof based on one or more customer attributes, such as, for example, of quality of service (QoS) level. The customer attribute is linked to a plurality of timer parameters that define the behavior of the adaptive packet inactivity timer for management of the data transmission system. Additionally, the customer attributes can be assigned to a customer based on a contract level associated with the customer, or based on an application type intended for use with the customer contract.

Abstract: Methods and apparatus to manage network transport paths in accordance with network policies are disclosed. An example apparatus comprises a policy manager to manage a first policy for a first endpoint and a second policy for a second endpoint, and a path manager to provision a transport network path based on the first and second policies.

Abstract: A method for calculating service redundancy of a wireless network is provided. The method comprises determining one or more of a plurality of routes through which a node can communicate to reach a destination. A routing metric is calculated for each of the plurality of routes. Using the calculated routing metrics a route having a best routing metric is identified as a best route to the destination. Service redundancy for each node within the wireless network is calculated using a sum of weighted ratios of the best routing metric to at least one alternate routing metric.

Abstract: A method and system for indexing physical channels in an OFDMA system where one OFDM symbol includes a plurality of subcarriers and one TTI includes a plurality of OFDM symbols are provided. A total number of subcarriers per OFDM symbol are divided into N groups. A kth group is selected from the N groups in each OFDM symbol of a TTI, and a physical channel corresponding to a set of subcarriers indexed with predetermined values, included in the kth groups of the TTI is indexed with an ordered pair (N, k).

Abstract: Upon detection of an overload condition at a network element, the network element sends two messages to those other network elements which may potentially send request messages to the overloaded network element. If the network utilizes the SIP signaling protocol, then the messages sent by an overloaded network element are SIP INVITE and SIP CANCEL. The CANCEL message comprises an indication that the sending network element is unavailable and an amount of time which the recipient network elements are to wait before sending any requests to the overloaded network node. Upon receipt of these messages, the receiving network elements wait for a delay time period before sending any additional request messages to the overloaded network element. During the waiting period, the waiting network elements may send request messages to network elements other than the overloaded network element which provide functionality similar to that of the overloaded network element.

Abstract: A method and system are described for resolving problems created by implementing multiple networks using private IP addresses and layer two tunneling protocols is described. A network processing system is operable to map flows from private IP addresses and ports on layer two tunneling protocol networks to public IP addresses and ports using the private IP addresses and ports and identifiers for the layer two tunneling protocol network. The network processing system uses its own public IP addresses and ports to anchor the traffic from the private network and performs the required mapping to pass traffic between the public and private networks.

Abstract: A network device includes multiple packet processing engines implemented in parallel with one another. A spraying component distributes incoming packets to the packet processing engines using a spraying technique that load balances the packet processing engines. In particular, the spraying component distributes the incoming packets based on queue lengths associated with the packet processing engines and based on a random component. In one implementation, the random component is a random selection from all the candidate processing engines. In another implementation, the random component is a weighted random selection in which the weights are inversely proportional to the queue lengths.

Abstract: Techniques are provided for adjusting to changes to the latency for a connection between two nodes on a network. In accordance with some embodiments, when a transmitting node encounters a retransmission timeout for a packet sent to a receiving node, the latency for the connection is newly measured and used to calculate a new retransmission timeout period for subsequent transmissions by the transmitting node. In some embodiments, the latency is not newly measured if a selective acknowledgement is received indicating that congestion on the network is only temporary.

Abstract: Apparatus and method providing improved fault tolerance through redundancy of hardware and software suitable for use in a head-end of an interactive information distribution system. Communications between each of a head-end controllers and each of the server modules are coincidentally sent along at least two signal paths to provide to additional fault tolerance in the event one of the signal paths becomes inoperable. In one embodiment, a video switch comprises a plurality of I/O ports coupled between a plurality of server modules and a plurality of subscriber equipment for transferring video information between the server and the subscriber equipment. A primary and secondary switch controller are each coupled to the head-end controllers and the plurality of I/O ports. The primary switch controller is used for routing data packets containing said video information between the plurality of I/O ports.