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Sustaining session connections

A protocol and heartbeat message technology, applied in digital transmission systems, data exchange networks, electrical components, etc., can solve computing-intensive problems

Active Publication Date: 2011-07-27
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with sending a REGISTER, or indeed any valid SIP message that contains valid data, is that doing so can be computationally intensive when multiple clients and servers need to do so to maintain a connection

Method used

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Examples

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Embodiment Construction

[0025]In one embodiment, techniques for maintaining session connections are provided. This technique sends heartbeat messages when not sending messages can cause the session connection to be closed due to a timeout condition. Heartbeat messages are valid transport layer messages containing non-empty payloads that are ignored by protocols at higher layers of the data communication stack. For example, the technique may send TCP messages that contain only Carriage Return and Line Feed ("CRLF") in their payload. Because the TCP layer considers messages that contain only CRLFs to be valid TCP messages, an intermediate computing device, such as a proxy server, can reset the message clock involved in the connection in which the message is sent or received. The message clock indicates the amount of time that has elapsed since a message was last sent or received on the connection. The intermediate computing device may close the connection when the connection's message clock indicates...

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Abstract

In an embodiment, techniques for sustaining session connections are provided. The techniques send heartbeat messages when not sending a message may cause the session connection to close because of a timeout condition. Heartbeat messages are valid transport layer messages that will be ignored by protocols at higher levels of a data communications stack. As an example, the techniques may send a TCPmessage containing only a carriage return and line feed (''CRLF'') in its payload. Because the TCP layer considers a message containing only a CRLF to be a valid TCP message, intermediary computing devices such as proxy servers may not interpret heartbeat messages as ''keep alive'' messages, and may sustain session connections.

Description

technical field [0001] The described techniques relate generally to data communication networks, and in particular to maintaining session connections. Background technique [0002] Computing device users sometimes use their computing devices to communicate with other users. For example, a user may use a computing device to communicate with another user by sending or receiving typed messages, such as by using a MICROSOFTMESSENGER ("MESSENGER") instant messaging product. As another example, a user may communicate with another user by speaking using a microphone and hearing the other user through a speaker or headset, such as by using a Voice over Internet Protocol ("VoIP") application. These users may use various computing devices such as personal computers, personal digital assistants, cellular telephones, VoIP-enabled telephones, and the like. [0003] Applications that provide these types of communication services to users may also need to provide presence information. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/08
CPCH04L12/581H04L51/04H04L69/329H04L29/08576H04L29/08072H04L67/145H04L29/06H04L67/14H04L65/1083H04L51/23G06F15/16H04L9/40
Inventor J·E·安德瑞M·马尔卡良
Owner MICROSOFT TECH LICENSING LLC
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