WO2008131706A1 - Affectation de noeuds d'un réseau radio à des passerelles - Google Patents

Affectation de noeuds d'un réseau radio à des passerelles Download PDF

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Publication number
WO2008131706A1
WO2008131706A1 PCT/DE2007/000778 DE2007000778W WO2008131706A1 WO 2008131706 A1 WO2008131706 A1 WO 2008131706A1 DE 2007000778 W DE2007000778 W DE 2007000778W WO 2008131706 A1 WO2008131706 A1 WO 2008131706A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
gateway
nodes
gateways
network
Prior art date
Application number
PCT/DE2007/000778
Other languages
German (de)
English (en)
Inventor
Markus Erlmann
Hendrik Gerlach
Christian Hock
Frank Volkmann
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE2007/000778 priority Critical patent/WO2008131706A1/fr
Priority to DE112007003591T priority patent/DE112007003591A5/de
Publication of WO2008131706A1 publication Critical patent/WO2008131706A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers

Definitions

  • the invention relates to a method for assigning nodes of a punk network to gateways, via which the nodes are connected to a network, wherein each node logs on to a gateway located within radio range when it is started up.
  • the invention further relates to a node of a radio network which can be connected to a network via a gateway, a gateway of a network to which a node of a radio network can be connected, and a system comprising at least one network having at least one gateway and at least one radio network having at least a node, wherein the node is connectable to the network via the gateway.
  • Such a method is used where elements such as in particular sensors and actuators are wirelessly connected via gateways to a network.
  • elements such as in particular sensors and actuators are wirelessly connected via gateways to a network.
  • sensor-actuator wireless networks are also becoming increasingly important in automation technology today, and it can be assumed that they will be used even more frequently in the future, particularly in automation technology.
  • nodes eg sensors or actuators
  • a radio network such as the wireless sensor-actuator networks mentioned above
  • gateways to the infrastructure (a network). It can be manually determined which node is assigned to which gateway, ie via which gateway a sensor or actuator node communicates with the infrastructure.
  • This manual assignment is optional; if no such assignment is made, it happens more or less randomly.
  • An automatic mechanism known from the WLAN field is the grouping based on the reception field strength, that is, a sensor / actuator node would look for the gateway to which it has the best radio contact. This gives no predictable results if equivalent reception ratios are present: then the grouping is more or less random.
  • such a procedure involves the risk that individual gateways must operate disproportionately many sensor / actuator nodes, whereas other gateways are hardly used for communication. However, this danger can be circumvented by mechanisms of the prior art.
  • redundancy or availability which are of particular importance for automation technology, are not taken into consideration in all known methods.
  • mechanisms are known in the art for implementing redundancy for access points (e.g., the LANCOM Systems XAP-40-2), they do not solve it
  • the invention is based on the object nodes of a radio network for connection to a network with gateways automa- table to assign the gateways such that a existing redundancy in the radio network in the overall system is maintained.
  • each node transmits node-specific information during the registration
  • each gateway receives information, at least via the nodes registered with it, which gateways are within reach of these nodes,
  • each gateway determines, by means of the node-specific information, whether redundant nodes are registered with it,
  • the node (s) destined or designated for this purpose are registered with the gateway (s) or gateway (s).
  • the object is further achieved by a node, a gateway and a system having the features specified in claims 10, 12 and 13, respectively.
  • the nodes are grouped automatically, not by configuration or due to the reception field strength, but on the basis of (node-specific) information, which is supplied by the respective node (typically sensor or actuator).
  • the grouping can be considered as a kind of route selection.
  • the inventive method is not limited to two gateways or two redundant nodes, but can also be applied to complex systems with multi-redundant nodes. As a result of the regrouping, the redundant nodes-if there are still further gateways within radio range-are distributed to different gateways, so that the redundancy of nodes, ie of sensors and / or actuators, can also be used in the overall system.
  • the method is basically also suitable for wired "gateways". Gateways can then be switches or routers in this context.
  • a designation with a nomenclature that identifies redundant nodes is transmitted by at least one node.
  • This designation may e.g. be a measuring point / measured value information.
  • a sensor thus provides, for example, information about the measuring point, e.g. a resource identifier.
  • the nomenclature of the measuring point designation is designed in such a way that redundancy can be identified (eg rule-based). For example, two redundant pressure sensors that provide the same measurements have the designations B00050-1 and B00050-2. These equipment labels can be brought into the nodes during installation, for example.
  • a location information is transmitted from at least one node.
  • information about the installation location is thus delivered. It is assumed that redundant sensors provide the same location information.
  • the location information is thereby obtained from the at least one node.
  • the installation site does not have to be entered into the node by a project engineer, but is itself determined by the node, for example using GPS or radio direction finding.
  • an identifier for identifying the type of node is transmitted by at least one node. Especially in systems where For example, only one temperature value to be determined, this information is sufficient to detect redundant temperature sensors.
  • the node-specific information contains different information, for example location information in conjunction with an indication of the measured value type. This makes it possible to operate several different sensor types at the same location, assuming that two sensors having the same location information are redundant if they have the same type of measurement (e.g., two pressure sensors).
  • each gateway registers which nodes are within its radio range and receives the information as to which other gateways are within range of the nodes registered with it from the respective other gateways.
  • a coordination between the gateways takes place in order to coordinate the regrouping of redundant nodes. This is achieved by the fact that the gateways in the commissioning phase (of a node or a gateway, but also of a subnetwork or the entire automation system) coordinate with each other and thus determine which gateway feels responsible for which node.
  • At least one node transmits the information about which other gateways are in its radio range when logging on to a gateway. In simple cases, it may even be possible for the respective gateway alone (i.e., without coordination with other gateways) to decide to reorder the node.
  • the assignment of at least one redundant node of a gateway to another in the radio range of the relevant node takes place in that the corresponding gateway requests the at least one redundant node to log in to the other gateway.
  • each gateway receives information from other gateways about the number of nodes registered at the respective gateway, and at least one node of the gateway is allocated to another gateway located within its radio range in order to reduce the unequal distribution.
  • the method according to the invention also makes it possible to include aspects of the load distribution as well.
  • 1 shows two gateways of a network to which four nodes are assigned
  • FIG 2 shows an inventive assignment of the nodes of Figure 1 to the gateways.
  • the 1 shows two gateways 1, 2, which are connected to each other via a network 3 (via cable or wireless).
  • control devices such as CPUs or PLCs which are consumers or producers of the information from or to the nodes K1, K2, K2 ', K3.
  • the nodes K1, K2, K2 ', K3 are located in the radio field areas 4, 5 of the gateways 1, 2 and have different reception field strengths of these.
  • the node Kl is located only in the radio field area 4 of the gateway 1, node K3 only in the radio field area 5 of the gateway 2, and the nodes K2, K2 'are within radio range 4, 5 of the two gateways 1, 2 (represented by the broken arrows).
  • K2 and K2 ' are eg sensor nodes which deliver the same or comparable measured values (redundant sensors).
  • the nodes K1, K2, K2 ', K3 must report to the gateways 1, 2 and must be integrated into the network.
  • the aim here is to use the sensor redundancy and to guide it via the independent gateways 1, 2 without the need for a configuration.
  • the following assignment for example, first results: K1, K2, K2' at gateway 1, K3 at gateway 2.
  • grouping For example, first results: K1, K2, K2' at gateway 1, K3 at gateway 2.
  • Such an assignment could eg result if the registration of the nodes Kl, K2, K2 ', K3 happens at the gateways 1, 2 only due to the reception field strength. In this case, the assignment is almost random at almost the same reception field strength; in the example shown in the figure, node K2 '- although physically closer to gateway 2 - would be more in the radio field area 4 of gateway 1 than that of gateway 2 (corresponding to a larger reception field strength), so that the above-mentioned grouping would result.
  • Gateway 1 fails, the connection to K2 and K2 'is lost, i. the existing redundancy of K2 and K2 'can not be used. This not only applies to sensors but also to actuators in the same way: the sub-process assigned to K2 and K2 'can then no longer be controlled.
  • this grouping is also unfavorable for an effective load distribution, since gateway 1 has to supply three nodes K1, K2, K2 ', whereas gateway 2 only has one node K3.
  • FIG. 2 shows the nodes K1 7 K2, K2 ', K3 and gateways 1, 2 of the network 3 from FIG. 1 with a desired configuration achieved by the method according to the invention, in which the nodes K1, K2 via gateway 1 and the nodes K2' , K3 are connected via gateway 2 to the network 3.
  • this configuration not only is the load distribution at the garage teways 1, 2, and in particular the primary task has been solved to obtain the redundancy present in the nodes K2, K2 'for the entire network in that they are now connected to the network 3 via different gateways 1, 2.
  • information is used which originates from the nodes K1, K2, K2 ', K3 itself.
  • This can in the exemplary case of two redundant pressure sensors K2, K2 •.
  • the first pressure sensor K2 supplies, for example, the device identifier B00050-1, the second, redundant pressure sensor K2 'B00050-2. If the nodes K1, K2, K2 ', K3 register with the gateways 1, 2, they also transmit this node-specific information. Based on this, the two gateways 1, 2 can vote in the commissioning phase and thus determine which gateway 1, 2 feels responsible for which node Kl, K2, K2 ', K3.
  • the nodes K1, K2, K2 ', K3 already provide information on logging in at the gateways 1, 2 with which alternative gateways 1, 2 (that is to say those with sufficiently good radio communication) know them.
  • the respective gateway 1, 2 itself that is, without coordination with other gateways
  • Gateway 1 determines that K2 and K2 'are redundant.
  • Gateway 1 notes that both know the alternative gateway 2. Gateway 1 initiates the regrouping of K2 '.
  • the regrouping can take place, for example, in that the gateway 1 requests the node K 2 'to tive gateway 2. If gateway 1 now fails, the associated measured value can also be obtained via K2 'and Gateway 2, for example.
  • the method according to the invention is not limited to two gateways or two nodes and in principle also suitable for wired "gateways". "Gateways" can then be switches or routers in this context.
  • the method can be designed in such a way that aspects of the load distribution are included, thus resulting in the most uniform possible use of the resources (gateways).
  • the invention relates to a method for the assignment of nodes of a radio network to gateways, via which the nodes are connected to a network, each node logs on its commissioning at a gateway within radio range.
  • each node logs on its commissioning at a gateway within radio range.
  • each node transmits node-specific information during the log-on, each gateway receives information about which nodes are within range of these nodes, at least via the nodes registered with it,
  • each gateway by means of the node-specific information determines whether redundant nodes are logged in with it, in the presence of redundantly registered nodes is determined based on the information about the gateways within reach of the node in question, which or which of the redundant nodes is assigned to another gateway or and - the node (s) destined or designated for this purpose are registered with the gateway (s) or gateways (s).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant d'affecter des noeuds d'un réseau radio à des passerelles, par l'intermédiaire desquelles les noeuds sont reliés à un réseau, chaque noeud établissant une demande de connexion auprès d'une passerelle se trouvant à sa portée, lors de sa mise en service. L'objectif de l'invention est d'affecter automatiquement des noeuds d'un réseau radio aux passerelles pour permettre la connexion desdits noeuds à un réseau à l'aide de passerelles, de sorte qu'une redondance présente dans le réseau radio soit maintenue dans l'ensemble du système. A cet effet, l'invention concerne un procédé du type susmentionné, selon lequel chaque noeud envoie une information spécifique du noeud lorsqu'il établit une demande de connexion; chaque passerelle reçoit une information au moins par l'intermédiaire du noeud ayant établi une demande de connexion auprès de ladite passerelle, les passerelles se trouvant à la portée des noeuds; chaque passerelle détermine, à l'aide de l'information spécifique du noeud, si des noeuds redondants ont établi une demande de connexion auprès de ladite passerelle; si des noeuds redondants ont établi une demande de connexion, les passerelles se trouvant à la portée des noeuds concernés déterminent, à l'aide de ladite information, quel noeud redondant (ou quels noeuds redondants) a (ont) été affecté(s) à une autre passerelle, et le noeud (ou les noeuds) ainsi déterminé(s) établit (établissent) une demande de connexion auprès de la passerelle (ou des passerelles) correspondante(s).
PCT/DE2007/000778 2007-04-30 2007-04-30 Affectation de noeuds d'un réseau radio à des passerelles WO2008131706A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/DE2007/000778 WO2008131706A1 (fr) 2007-04-30 2007-04-30 Affectation de noeuds d'un réseau radio à des passerelles
DE112007003591T DE112007003591A5 (de) 2007-04-30 2007-04-30 Zuordnung von Knoten eines Funknetzwerkes zu Gateways

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2007/000778 WO2008131706A1 (fr) 2007-04-30 2007-04-30 Affectation de noeuds d'un réseau radio à des passerelles

Publications (1)

Publication Number Publication Date
WO2008131706A1 true WO2008131706A1 (fr) 2008-11-06

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PCT/DE2007/000778 WO2008131706A1 (fr) 2007-04-30 2007-04-30 Affectation de noeuds d'un réseau radio à des passerelles

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WO (1) WO2008131706A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695059A1 (fr) * 1994-07-29 1996-01-31 International Business Machines Corporation Pont entre un réseau local sans fil et un réseau local câble
US20050021724A1 (en) * 2003-07-07 2005-01-27 Industrial Technology Research Institute And Hsiang-Tsung Kung Methods and systems for operating a logical sensor network
EP1727312A1 (fr) * 2004-03-10 2006-11-29 ZTE Corporation Procede d'equilibrage des charges entre des point d'acces dans un reseau local sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0695059A1 (fr) * 1994-07-29 1996-01-31 International Business Machines Corporation Pont entre un réseau local sans fil et un réseau local câble
US20050021724A1 (en) * 2003-07-07 2005-01-27 Industrial Technology Research Institute And Hsiang-Tsung Kung Methods and systems for operating a logical sensor network
EP1727312A1 (fr) * 2004-03-10 2006-11-29 ZTE Corporation Procede d'equilibrage des charges entre des point d'acces dans un reseau local sans fil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JANG-PING SHEU ET AL: "A Distributed Query Protocol in Wireless Sensor Networks", WIRELESS PERSONAL COMMUNICATIONS, KLUWER ACADEMIC PUBLISHERS, DO, vol. 41, no. 4, 16 August 2006 (2006-08-16), pages 449 - 464, XP019509780, ISSN: 1572-834X *

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