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High-Density Wireless Local Area Network

a wireless local area network and high-density technology, applied in the field of wireless data communication networks, can solve the problems of not being able to support the desired number of field devices and the high overhead

Inactive Publication Date: 2008-10-02
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The system significantly reduces communication overhead and supports a large number of field devices, enabling efficient real-time control in industrial applications by optimizing message transmission and handling through polling, buffer management, and handoff processes.

Problems solved by technology

If the 802.11 protocol were applied without change to such applications, the overhead may be quite high, e.g., in excess of 80%, and it may not be possible to support the desired number of field devices.

Method used

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  • High-Density Wireless Local Area Network
  • High-Density Wireless Local Area Network
  • High-Density Wireless Local Area Network

Examples

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Embodiment Construction

[0030]According to some embodiments, a wireless data communication system is optimized for use in an industrial application. Among other strategies, messages addressed from an access point (AP) to a data communication station (STA) or from a STA to the AP are loaded with additional data units for receipt by other STAs. The efficiency of the data communication system is improved by these strategies so that the system can support close to real time control and the rather large number of field devices that may be needed in an industrial installation.

[0031]FIG. 1 is a block diagram of a wireless data communication system 100 provided according to some embodiments. The system 100 includes a system controller 102 which is the ultimate source of control messages for controlling the various field devices, discussed below, which make up a factory automation installation. The system controller 102 may also be the ultimate recipient of status and other messages that originate with the field de...

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PUM

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Abstract

A data communication system includes an access point and a plurality of stations each for exchanging wireless data communication messages with the access point. At least some of the messages are in a format that includes at least one message header and a plurality of data units. Each of the data units includes a respective data unit header and a respective data frame. Each data unit header identifies a respective one of the stations as a recipient to receive the respective data frame of the data unit.

Description

BACKGROUND[0001]The present invention relates to wireless data communication networks.[0002]Wireless data communication networks are widely used. For example, popular types of wireless local area network (WLAN) are based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard or its variations. Typical applications of 802.11 WLANs include office, enterprise and home data networks.[0003]The 802.11 media access control (MAC) layer protocol uses a Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) approach to provide random access to the network for all devices while reducing contention that results from overlapping transmissions by more than one device at a time. In CSMA / CA, a device that wishes to transmit a frame listens to the carrier frequency for a fixed interval to make sure the channel is idle, and then starts transmission. When the receiving device receives the frame, the receiving device sends back an acknowledgement frame to the sending ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J3/24H04W74/06
CPCH04W74/06
Inventor LIAO, RAYMONDCHEREDDY, RAGHUVEERMUELLER, JOERGKELLER, STEFANBENJAMINS, KAIWEILER, CHRISTOPH
Owner SIEMENS AG