Systems and methods for providing presence tracking in a distributed computing system
a distributed computing system and presence tracking technology, applied in power distribution line transmission, powerline communications applications, instruments, etc., can solve problems such as interference, data distortion or unrecognizable, and the actual physical medium used for communications in a logical network is not ideal, so as to optimize the bandwidth utilization of shared physical media
Inactive Publication Date: 2007-01-04
MICROSOFT TECH LICENSING LLC
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Benefits of technology
The present invention is about systems and methods for tracking the presence of nodes in a distributed computing system. Each node in the network keeps track of all other nodes, which helps to optimize bandwidth utilization by avoiding communication with devices that are not present. This is particularly useful in low-bandwidth networks like power line carriers, where the presence of devices is often temporary. The nodes in the network send a qualifying message periodically to track the presence of other nodes. The invention also suggests assigning different values to different groups of nodes, with one group being faster and the other group being slower in terms of presence tracking. This helps to further optimize bandwidth utilization.
Problems solved by technology
However, the above-described scenarios presume ideal, or near ideal, network conditions, and in contrast, often the actual physical medium utilized for communications in a logical network is not ideal.
For instance, in the case of power line communications, data is not always guaranteed to arrive at its destination, or when it does, there may be some interference along the way that distorts the data or renders it unrecognizable.
Similarly, on the reception side of data communications, interference can also be of impact.
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Overview
[0022] As described above, there is a need for improved presence tracking of nodes in a logical network, particularly in connection with a low data rate or baud rate, less than ideal physical network underlying the logical network, wherein low data rates, and transient presence hamper presence tracking. A naive approach would be to frequently refresh the presence of all nodes at the same rate; however, practically speaking, the assertion criteria for different kinds of nodes on the logical network should be flexible. The invention thus provides a simple, yet robust, optimization of “keep alives” in connection with such a low bandwidth, less than ideal physical network that enables dynamic tuning of logical network(s) according to messaging conditions, and rates of nodes coming and going in the network.
[0023] In accordance with the invention, each node in a logical network, such as Simple Control Protocol (SCP) network, tracks the presence of all other nodes on the network...
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Providing presence tracking of nodes of a logical network in a distributed computing system. Each node in a logical network tracks the presence of all other nodes on the network. This presence information is used by the protocol to optimize bandwidth utilization of the shared physical media, by not attempting to communicate with a device that does not appear to be or is unlikely to be present. In one embodiment, the presence tracking is applied to a power line carrier (PLC) physical media because of PLC's low-bandwidth characteristics, low baud rate characteristics and the widespread usage of plugged-in devices, the presence of which on the network is generally more transient by nature.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 251,370, filed Sep. 19, 2002 (MSFT-1346 / 186575.01).COPYRIGHT NOTICE AND PERMISSION [0002] A portion of the disclosure of this patent document may contain material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. The following notice shall apply to this document: Copyright ©1999-2002, Microsoft Corp. FIELD OF THE INVENTION [0003] The present invention is directed to systems and methods for providing presence tracking of nodes of a logical network in a distributed computing system. More particularly, the present invention is directed to systems and methods for automatically tuning a logical network with “keep alive” optimi...
Claims
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IPC IPC(8): G06F15/173H04B3/54
CPCH04B3/542H04B2203/5445H04B2203/5408
Inventor SIMONNET, GUILLAUMEPYLE, HARRY S.
Owner MICROSOFT TECH LICENSING LLC