1488 results about "Data link layer" patented technology

This invention is an apparatus and a method that selects the optimum location of a service on the Internet according to the user's geo-location and the configuration of the invention by transparently altering the DNS messages. In the preferred embodiment, the invention operates at OSI model's data link layer and it is located in front of the DNS server so that it does not require any modification in the existing DNS or IP network setup or on the application servers. It provides a fast and transparent method of locating an Internet service without the overhead of server scripts, HTTP redirects, or extra steps by the user to find the desired location or content.

A method for selectively redirecting a data packet to a port on a switching device which is associated with a corresponding network service. In one embodiment, the data packet is redirected to an intrusion prevention service (IPS) for security analysis of the data packet. In another embodiment, the switching device performs a data link layer redirecting of the data packet based at least in part on whether the data packet is to be flooded from the switching device.

A network virtualization layer for an information handling system in which a physical machine coupled to a network is divided into a plurality of logical partitions, each of which has a host system residing thereon. In response to receiving a set command from one of the host systems specifying a data link layer (layer 2) address, the virtualization layer associates the data link layer address with the host system and forwards to the host system data packets specifying the data link layer address as a destination address. Unicast packets are forwarded to the single host system specifying the destination address as an individual MAC address, while multicast packets are forwarded to each host system specifying the destination address as a group MAC address. A host system may also specify a virtual LAN (VLAN) ID, which is used to scope the forwarding of packets to host systems sharing that VLAN ID.

Embodiments are directed to transmitting L1 pre-signaling information with predetermined modulation and code rate such that L1 pre-signaling information can be received without preliminary knowledge on the network. L1 pre-signaling information makes it possible to receive the L1 signaling information, data link layer information, and notification data that may have configurable code rates and modulation. Therefore, L1 pre-signaling information can be thought of as signaling metadata (i.e., information about other signaling information). L1 signaling is divided into pre-signaling and signaling parts. The pre-signaling part includes parameters used for receiving the L1 signaling information. L1 pre-signaling signaling enables the receiver to receive the signaling itself (L1 signaling and data link layer information) by informing the receiver about the type of modulation, coding, and the like, used to transmit the L1 signaling, data link layer, and notification information.

A method for controlling errors in a wireless link layer using a simultaneous multiple copy scheme and an adaptive forward error correction (FEC) scheme in a wideband wireless communication is provided. The method for controlling errors in a link layer in wideband wireless communication using an automatic repeat request (ARQ) scheme, in which a wideband wireless channel is used for communication between a first node and a second node, includes the steps of (a) estimating the error ratio of a forward (a direction in which a cell is transmitted from the first node to the second node) channel using the state of a backward (a direction in which a cell is transmitted from the second node to the first node) channel, and transmitting a cell, in which a forward error correction (FEC) code having an encoding ratio that varies depending on the estimated error ratio is included in a protocol data unit (PDU) of a wireless link layer, through the forward channel and (b) re-transmitting the copy of a cell transmitted in the step (a), when feedback information that indicates that an error exists in the cell transmitted in the step (a) is received through the backward channel. It is possible to reduce the number of times of re-transmission by improving the probability of correcting forward errors using more error controlling bits as the state of the channel is worse and to minimize the waste of resources using less error controlling bits as the state of the channel is better, to thus obtain the optimal performance and guarantee the minimum delay time.

A packet switching apparatus includes a plurality of lower layer processing units, a table, and a processing unit. Each of the plurality of lower layer processing units carries out a process for a data link layer and a physical layer to a packet. The table stores flow data which includes a routing data and a search key. The processing unit searches the flow data from the table based on a search key of a routing packet received via one of the plurality of lower layer processing units, when the flow data for the search key of the routing packet is registered on the table. Also, the processing unit selectively transfers the routing packet to one of the plurality of lower layer processing units based on the routing data of the searched flow data.

A method and system for configuring one or more prospective-participant nodes as participant nodes so as to enable the prospective-participant nodes to engage in a peer-to-peer communication is provided. In one exemplary embodiment, the method and system may be embodied as a common application that includes logic, in hardware or software form, for carrying out one or more of the functions for configuring one or more prospective-participant nodes as a participant node in a peer-to-peer network. In carrying out these functions, one of the participant nodes discovers its network connection settings, and based on these settings, generates participant-node-configuration data that includes one or more network connection settings that define how to address the prospective-participant node as a participant node. When desiring to join the peer-to-peer network, the prospective-participant node and the participant node may establish a point-to-point communication link by engaging in a discovery process using so as to establish a data-link layer connection. After completing negotiation of the data-link-layer connection, the prospective-participant node and the participant node may communicate over the data-link-layer connection. The prospective-participant node may send to the participant node a request for network access. Responsively, the participant node sends to the prospective-participant node the participant-node-configuration data over the point-to-point connection. And the prospective-participant node configures itself using the participant-node-configuration data so as to become a participant node.

The design of integrated circuits, i.e., semiconductor products, is made easier with a semiconductor platform having versatile power mesh that is capable of supporting simultaneous operations having different frequencies on the semiconductor product; e.g., higher frequency operations may be embedded as diffused blocks within the lower layers or may be programmed from a configurable transistor fabric above the diffused layers. Preferably the power mesh is located above the layers having the operations requiring the different frequencies, and may be fixed in an application set given to a chip designer or may be configurable by the designer her/himself. For example, to support high speed communications adjacent an embedded high speed data transceiver, the transistor fabric may be programmed as a data link layer having higher performance requirements than the rest of the integrated circuit. The data link layer may be connected to one of the localized grids of the versatile power mesh which may have an increased density and/or wider strap width of a power/ground grid. Additional decoupling capacitance can be embedded in the lower layers of the semiconductor product and/or can be programmed from the configurable transistors fabric.

An inter system handovers in a mobile telecommunication system is performed when a dual mode user equipment (UE) covered by both GSM/GPRS network and UMTS network connects a dedicated channel and sets up a call in a BSS region where the GSM/GPRS provides coverage, and then moves to a UTRAN (UMTS Terrestrial Radio Access Network) where the UMTS provides coverage, wherein the method includes the steps of: if the dual mode UE receives an inter system handover command, i.e. from the BSS to the UTRAN, requesting GSM/GPRS data link layer to suspend a GSM/GPRS data link by a sublayer RR of GSM/GPRS network layer in the UE, requesting a GSM/GPRS physical layer to release a physical channel of the GSM/GPRS, and sending the inter system handover command to the UTRAN for authorizing a sublayer RRC of UMTS network layer in the UE to continue a call; requesting, at the RRC in the UE, a UMTS physical channel to be configured as a UMTS physical channel, and monitoring if the UMTS physical layer succeeds to have the configuration of the UMTS physical channel as requested; if the UMTS physical layer succeeds to have the configuration of the UMTS physical channel, requesting, at the RRC in the UE, a UMTS data link layer to configure a UMTS data link, and conveying information to the UTRAN through a UMTS channel that the handover between systems from the BSS to the UTRAN has been successfully performed; and sending, at the RRC, a GSM/GPRS resource release message to RR/GRR, thereby resetting the GSM/GPRS physical layer and the GSM/GPRS data link layer.

A frame transmission method is provided in which a multi-hop connection is established between access points and wireless terminals connected to the access points by using only a MAC address, the identifier of the data link layer (Layer 2). Various control frames are transmitted between access points to acquire the network topology. Over the unicast/broadcast communication system, data may be relayed and transferred in the form of frames from a wireless terminal connected to an access point to another wireless terminal via the optimum multi-hop path.

A method and computer program product for building a multiple layer object-oriented software application with reusable components. The method includes the steps of creating business classes containing business logic for the software application; reading templates utilizing reusable components from a template solution file; and generating programming code for the software application based on the created business classes and selected template. The multiple layers include a data layer, a data access layer, a business logic layer and a user interface layer with executable logic for each layer placed into a corresponding assembly data structure. Security tokens are required to access the classes and methods in either the business logic assembly or data access assembly. A serializable data assembly includes container classes that are used to pass data between the business logic layer and data access layer when a dataset or data table is not appropriate. A code generator user interface enables an application developer to define a namespace, a deploy directory name, a database type, an application type, a target source code directory, and a plurality of class specifications and search criteria.

The invention concerns the bit error resilience of an IP protocol stack based on a secure link layer, in which packet flows are header compressed according to a suitable header compression standard. According to the invention, by analyzing each packet at the link layer it can be determined whether the packet is a full header packet, in which case the link layer checksum evaluation is used as normal for discarding faulty full header packets, or a header compressed packet in which case the link layer checksum evaluation is ignored and the packet is propagated upwards in the protocol stack. This solution not only opens up for more intelligent higher-level handling of faulty header compressed packets, but also solves the problem of properly protecting full header packets at the link layer. In order to compensate for ignoring the link layer checksum evaluation for header compressed packets, header protection is introduced at the header compression level of the link layer by using one or more local checksums. The invention is particularly applicable to delay-sensitive real-time data such as compressed voice or video.