Method for establishing bidirectional data transmission paths in a wireless meshed communication network

Abstract

The invention relates to a method for establishing a bidirectional data transmission path in a wireless meshed packet-switched communication network, wherein a logical topology in the form of at least one routing tree can be proactively established, wherein a root network node (R) of the routing tree sends first unidirectional data transmission paths regarding routing request messages (RANs) specifying the root network node (R) to the network nodes (M1-M7) of the communication network in periodic time intervals. A first flag is provided in the network nodes (M1-M7) of the routing tree that can be put into two different states. Upon receipt of a routing request message (RAN), a network node (M5) only sends a second unidirectional data transfer path regarding the routing response message (RWN) specifying the network node to the root-network node (R) if the first flag is switched into a first selectable state (ON). Thus, a bidirectional data transfer path between the root network node (R) and the network node (M5) is established.

Description

technical field [0001] The present invention is in the technical field of message technology, and relates to a method for realizing a bidirectional data transmission path in a wireless mesh communication network. The invention also relates to a suitable wireless mesh communication network for carrying out the method. Background technique [0002] For wireless WLAN communication networks (WLAN=Wireless Local Area Network), a number of different standards have been published by the Institute of Electrical and Electronics Engineers (IEEE) within the framework of the standard series IEEE802.11 since the beginning of the nineties. Certain characteristics of communication networks, such as transmission rates, frequency ranges, modulation methods, number of channels, encryption, etc., are constrainedly prescribed based on rapidly advancing technological developments. [0003] In current standards, the smallest unit of a WLAN communication system is a wireless cell, in which an acc...

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Problems solved by technology

[0010] However, since the reverse path from the root MP to the MP cannot be updated and remains as established by sending a PREP from the MP before sending the first data packet of the data traffic, it may occur that the connectivity does not change while the link When the metric (Link-Metriken) changes, the forward and reverse paths between the root MP and the MP are different, so that the data packets take the (updated) more favorable route on the forward path, while on the reverse path Take the (not updated) less favorable route on

If the data link in the data transmission path between the root MP and the MP fails, an alternate forward path between the root MP and the MP is established through periodically sent PREQs, and conversely, it is no longer possible to pass the unupdated reverse forward path. data transfer to path

In this case, a standard mechanism based on AODV (Ad Hoc On Demand Distance Vector, Ad Hoc On Demand Distance Vector) is accessed in HWMP, which brings about a relatively long delay before starting to transmit data packets from the root MP to this MP. delay

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