摘要:
Methods, apparatuses and systems directed to routing configuration in a hierarchical wireless mesh network. In one implementation, the present invention uses neighbor messages to allow routing nodes to discover one another and configure a hierarchical routing configuration. In one implementation, the present invention provides a neighbor and adjacency protocol that provides for automatic mesh configuration and loop-free mesh topologies.
摘要:
A preemptive roaming mechanism in wireless network environments. In one implementation, the present invention provides a wireless client that implements a preemptive roaming mode that, when an attribute of the signal (e.g., Signal to Noise Ratio (SNR), etc.) between the access point with which the client is currently associated crosses a threshold, scans for other access points with which to associate. In one implementation, the client switches between the scanning mode and a traffic mode to allow data to be transferred between the client and the current access point. The pre-emptive roaming functionality can be configured to support desired data rates or other QoS levels.
摘要:
A real-time data transport protocol directed to aggregating multiple packets of a real-time protocol session and transmitting redundant copies of the packets as defined by a sliding window. In particular implementations, a method comprising accessing a plurality of packets of a real-time protocol session; aggregating, over a sliding window, a contiguous sequence of packets in the plurality of packets into real-time data transport packets, and transmitting the real-time data transport packets to a receiving node.
摘要:
In a fixed channel wireless network system with a limited number of channels, assignment of the fixed channels between remote client elements and access elements is made systematically according to a set of criteria according for network loading and interference, then channel assignments are dynamically updated according to a priority to maintain optimal network performance with changing conditions of load and interference. The channel utilization problem is addressed at a system level rather than at a local level by treating the system as a three dimensional color mapping problem. All noise is treated as having a source in virtual access elements with an appropriate performance metric. The performance metric is used to select a channel set that minimize chances of interference and maximize user performance. Specifically, there are several parameter matrices which are managed and updated by a central resource management element, namely signal strength between elements, interference, and load. These matrices are used to find the optimal channel assignments for a predetermined limited set of assignable channels. In one implementation, the channel assignment methodology takes into account the interference associated with access elements operating on a selected channel, as well as the interference or energy that spills over (or is otherwise observable) on physical channels adjacent to the selected channel.
摘要:
Methods, apparatuses and systems directed to optimizing vector models for use in modeling RF propagation in desired physical environments. In one embodiment, the present invention can operate on pre-existing vector models. In other implementations, the present invention facilitates the conversion of raster images of buildings and other physical locations to vector formats for use in connection with the computational modeling of radio-frequency (RF) propagation. According to certain embodiments, the present invention is implemented within the context of a location diagram editing application that supports a line recognition filter, a snap filter and a merge filter which a user may individually select and configure. As discussed more fully below, the line recognition filter operates on the vector objects to adjust near-vertical lines (as defined by a configurable threshold angle) to vertical, and near-horizontal lines to horizontal. In some configuration modes, the line recognition filter may also delete lines that are oriented at an angle greater than a threshold from the x-axis and y-axis to, for example, clean up vector objects corresponding to text and other elements that are usually analytically irrelevant to modeling RF propagation. The snap filter, in one implementation, operates to extend closely spaced objects that are oriented within a threshold distance from each other. The merge filter operates, in one implementation, to merge closely spaced parallel lines to, for example, adjust the vector file to correctly model a wall with a single vector object. In one implementation, the output resulting from the invention is a vector file that has each wall accorded a given wall type, and is optimized for use in connection with an RF prediction engine.
摘要:
In an imperfect mesh network or in a star network, the directionality of transmission and reception at each node, as through a directional antenna, is selected to maximize combined or multiple-link end-to-end information throughput. To this end, a maximum throughput metric is provided for separate links through the network between a source node and a collection of end-point nodes to be optimized which is based on 1) measurement of link quality with respect to neighboring nodes and 2) information about link quality and other factors related to propagation delay or “latency” as reported to it by other nodes regarding their neighboring links, and 3) based upon the busy-ness or capacity utilization at each link.
摘要:
In one embodiment, a method includes receiving a Wi-Fi authentication request from a mobile device at a wireless controller, the request including a network access identifier, transmitting the request from the wireless controller to an authentication proxy, wherein the authentication proxy is in communication with a plurality of mobile operator authentication devices and operable to forward the request to one of the mobile operator authentication devices based on the network access identifier, and receiving a response to the request at the wireless controller, wherein the mobile device is permitted Wi-Fi access to a network by the wireless controller if the request is authenticated by the mobile operator authentication device. An apparatus and logic are also disclosed herein.
摘要:
According to one embodiment, a method includes monitoring, at one or more wireless network access elements, signal strength of signals transmitted by respective neighboring wireless network access elements. Information is collected from said wireless network access elements and converted into reportable data about signal strength observed during the monitoring. The method further includes identifying, based at least in part on interference associated with concurrent signal transmissions of the wireless network access elements, a combination of channel assignments for the one or more wireless network access elements from a plurality of possible combinations of channel assignments and assigning channels for concurrent, respective use by said wireless network access elements based on the identified combination of channel assignments.
摘要:
A wireless node location mechanism that defines a search region to optimize the computations associated with estimating the location of a given wireless node. According to one implementation, a coverage map associated with each radio receiver that records signal strength data is defined out to a threshold signal strength level. Before computing the estimated location of a given wireless nodes, a search region is defined based on the intersection of the coverage maps associated with each radio receiver that detects the wireless node. Some implementations use information provided by the fact that certain radio receivers did not detect the wireless node to further optimize the location estimate. By defining a search region, which is a generally small area relative to the space encompassed by an entire RF environment, the present invention provides several advantages, such as reducing the processing time and/or power to compute estimated locations for wireless nodes.
摘要:
Methods, apparatuses and systems facilitating the configuration of transmit power and coverage areas corresponding to access points in a wireless network environment. The present invention in one embodiment facilitates the dynamic configuration of coverage boundaries across a plurality of access points, improving the performance of the wireless network environment.