WO2015120628A1 - Procédé de transmission de trames de données dans un système de communication sans fil et dispositif d'accès sans fil - Google Patents

Procédé de transmission de trames de données dans un système de communication sans fil et dispositif d'accès sans fil Download PDF

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Publication number
WO2015120628A1
WO2015120628A1 PCT/CN2014/072154 CN2014072154W WO2015120628A1 WO 2015120628 A1 WO2015120628 A1 WO 2015120628A1 CN 2014072154 W CN2014072154 W CN 2014072154W WO 2015120628 A1 WO2015120628 A1 WO 2015120628A1
Authority
WO
WIPO (PCT)
Prior art keywords
wireless access
data frame
access point
send data
client
Prior art date
Application number
PCT/CN2014/072154
Other languages
English (en)
Inventor
Mattias Lampe
Norman MEINZER
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/CN2014/072154 priority Critical patent/WO2015120628A1/fr
Publication of WO2015120628A1 publication Critical patent/WO2015120628A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the present invention is especially adapted for being used in an industrial automation system.
  • Industrial automation systems usually comprise a multiplicity of automation devices networked to one another via an industrial communication network and, within the scope of production or process automation, is used to control or regulate installations, machines or devices.
  • real-time communication protocols such as Profinet, Profibus or real-time Ethernet are predominantly used in industrial communication networks for communication between automation devices.
  • Wireless communications systems are becoming increasingly more important in industrial automation systems and are therefore expected to provide for reliable data transmission.
  • Interruptions in communication connections between computer units of an industrial automation system or automation devices may result in undesirable or unnecessary repetition of the transmission of a service request. This causes additional utilization of communication connections of the industrial automation system, which may result in further system faults or errors.
  • messages which have not been transmitted or have not been completely transmitted may prevent an industrial automation system from changing to or remaining in a safe operating state, for example. This may finally result in failure of a complete production installation and costly production downtime.
  • a particular problem regularly results in industrial automation systems from message traffic with a comparatively large number of, but relatively short, messages, thus inten ⁇ sifying the above problems.
  • US 2006/0221993 Al discloses a WLAN network with a multiplicity of access points and a multiplicity of radio stations in the radio coverage area of the access points.
  • An access point selects a free frequency from a multiplicity of available frequencies, on which it then communicates with the radio stations located within its radio coverage area.
  • the different access points communicate with their respectively assigned radio stations on different WLAN channels, which are assigned to different radio frequencies.
  • the radio stations in the wireless network regularly scan the different WLAN channels, that is the different WLAN frequencies, in order to discover, via the signals received, where a suitable access network node is located or whether a better access network node than the currently assigned access network node is connected in the wireless network.
  • a method for use in wireless regional area network (WRAN) systems in which a WRAN cell is operated by a base station to wirelessly communicate with at least one consumer premise equipment.
  • the base station is operated to determine a channel available for use.
  • the determined channel is initialized to provide an in-band channel for data transmission.
  • spectrum management and spectrum sensing on a plurality of out-of-band channels and data transmission on the in-band channel is performed.
  • EP 2 365 643 Al relates to a radio station system for a wireless network with at least two access network nodes, in which a first node is assigned to the radio station system as an access network node in the wireless network.
  • the radio station system is connected to the first access network node via an active radio link for transmitting user data.
  • the radio station system comprises a first radio station, which is connected to the first access network node via the active radio link for exchanging the user data.
  • the radio station system comprises a second radio station, which is connected to the first radio station via a communication interface.
  • the second radio station transmits or exchanges no user data via a radio link with an access network node in the wireless network and temporarily identifies available access network nodes in the wireless network for the radio station system.
  • a method for switching channels in a wireless communication network comprising at least one access point and a number of clients is disclosed.
  • the communication network as secondary user uses one of a number of possible channels for data communication.
  • Data communication takes place between the access point and the number of clients via a first transmit /receive interface of the access point on a first channel of the possible channels.
  • a check of the possible channels is made via the transmit /receive interface by a second trans ⁇ mit/receive interface of the access point.
  • free channels are determined that are not being used by any primary user.
  • a switch of channel from the first channel to one of the free channels is carried out if a prioritized use of the first channel by a primary user is established by the access point of the communication network.
  • Wireless communication systems for industrial automation systems are usually optimized for reliable communication.
  • a method to avoid interference issues may be creating a guideline that prohibits using potential WLAN interferers in areas where WLAN is used for critical applications.
  • a guideline would be rather a weak protection, if there is no automatism for enforcing the guideline.
  • the present invention is based on the object of specifying a method for transmitting messages in an wireless communication system which allows for efficiently avoiding radio interference issues, and of providing a communication device suitable for carrying out the method.
  • the single radio interface of the wireless access point or client is employed both for communicating with the mobile station and for running a spectrum analysis relating to a selected radio channel.
  • a spectrum analysis relating to a selected radio channel.
  • interferences on the selected radio channel are determined.
  • Access to the selected radio channel is requested by sending a ready to send data frame to a selected mobile station connected to the wireless access point or client.
  • the ready to send data frame indicates a time interval the access is requested for by the wireless access point or client.
  • the selected mobile station the ready to send data frame is sent to may also be a wireless access point.
  • the access to the selected radio channel is requested by the wireless access point or client .
  • the ready to send data frame is acknowledged by sending a clear to send data frame from the selected mobile station to the wireless access point or client.
  • the clear to send data frame comprises an indication or confirmation, respectively of the time interval the access is requested for.
  • the wireless access point or client Upon receipt of the clear to send data frame at the wireless access point or client, the wireless access point or client runs the spectrum analysis relating to the selected radio channel during the time interval.
  • the wireless access point or client is switched from a communication mode to a spectrum analyzer mode during the time interval.
  • the present invention allows for a significantly cheaper solution by using just a single radio access point, preferably a single radio WLAN fat access point, running spectrum analysis virtually concurrently with regular communication. Particularly, this is done without losing data frames.
  • guidelines or policies for using radio interface resources can be enforced efficiently due to an early recognition of fault causes and a respective data logging of spectrum analysis results.
  • the selected radio channel is switched, an alarm is generated and a warning message, respectively is sent to a supervisory station, if the interferences on the selected radio channel are higher than a specified threshold.
  • interferences on the selected radio channel may be classified by the wireless access point or client running the spectrum analysis.
  • spectrum analysis data may also be transmitted to a network management station, e.g. for tracking or identifying a potential interferer .
  • every mobile station in range of the wireless access point or client stops transmitting data frames on the selected channel during the time interval the access is requested for.
  • the selected mobile station the ready to send data frame is sent to may be a virtual mobile station. In this case, sending the clear to send data frame from the selected mobile station to the wireless access point or client is suspended.
  • both the wireless access point or client and the mobile stations connected to the wireless access are RTS/CTS capable for doing so.
  • RTS/CTS capability means that access to the selected radio channel is generally requested by sending a ready to send data frame from a sender to a recipient.
  • the ready to send data frame indicates a time interval the access is requested for by the sender.
  • the wireless access point or client may be the sender or the recipient. Accordingly, the ready to send data frame is acknowledged by sending a clear to send data frame from the recipient to the sender. Consequently, upon receipt of the clear to send data frame at the sender, the selected radio channel is accessed for transmitting data frames by the sender during the time interval.
  • the selected radio channel is also used for communicating with the at least mobile station.
  • the spectrum analysis directly relates to the radio channel employed by the wireless access point or client.
  • the spectrum analysis may also relate to all available radio channels.
  • the selected radio channel can be switched.
  • the wireless access device according to the invention for carrying out a method as described above comprises a single radio interface and is embodied and configured for employing the single radio interface both for communicating with mobile stations and for running a spectrum analysis relating to a selected radio channel. Further, the wireless access device is embodied and configured for determining interferences on the selected radio channel by means of the spectrum analysis.
  • the wireless access device is embodied and configured for requesting access to the selected radio channel by sending a ready to send data frame to a selected mobile station.
  • the ready to send data frame indicates a time interval the access is requested for.
  • the wireless access device is embodied and configured for, upon receipt of a clear to send data frame from the selected mobile station, running the spectrum analysis relating to the selected radio channel during the time interval. This allows for avoiding radio interferences in wireless communications systems, es ⁇ pecially in industrial automation systems with a plurality of potential interferers like WLAN systems, RFID systems, frequency converters or electric drive systems.
  • the wireless access device is a wireless access point or client and embodied and configured for carrying out a method of transmitting data frames in a wireless communication system as described above.
  • the figure shows a schematic illustration of a wireless com ⁇ munication system with a selected radio channel monitored by means of spectrum analysis.
  • the figure shows a wireless communication system of an industrial automation system comprising a wireless access point 1 and a plurality of mobile stations 201-203 located in a radio cell covered by the wireless access point 1.
  • the wireless access point 1 comprises a single radio interface 11 for modulating and demodulating radio signals received or transmitted, respectively by means of an antenna 10.
  • the wireless access point 1 comprises a controller 12 and a further transmit /receive unit 13 which is connected to an industrial automation network 2.
  • a programmable logical controller 3 is also connected to the industrial automation network 2 and serves to control an automation device like a robot 4 or an electrical drive.
  • the industrial automation network 2 may be an IP-based communication network .
  • the single radio interface 11 of the wireless access point 1 is primarily used for transmitting data frames 111 between the wireless access point 1 and the mobile stations 201-203. However, the single radio interface 11 is employed both for communicating with the mobile stations 201-203 during an active WLAN operation period 101 and for running a spectrum analysis relating to a selected radio channel during a spectrum analysis period 103.
  • the spectrum analysis period 103 is comprised by a blocking period 102 in which the single radio interface 11 is not available for transmitting data frames 111. Instead of that, the single radio interface 11 is used for collecting measurement signals 112 during the spectrum analysis period 103.
  • interferences on the selected radio channel are determined. If the interferences on the selected radio channel are higher than a specified threshold, the selected radio channel may be switched to another radio channel. Alternatively or additionally, an alarm may be generated or a warning message is sent to a supervisory station, respectively.
  • both the wireless access point 1 and the mobile stations 201-203 are RTS/CTS capable (ready to send, clear to send) .
  • a first ready to send data frame is sent from a sender to a recipient, in which the wireless access point 1 is either the sender or the recipient.
  • the first ready to send data frame indicates an access time interval the transmission access is requested for by the respective sender.
  • the first ready to send data frame is acknowledged by sending a first clear to send data frame from the recipient to the sender. If the first clear to send data frame is received by the sender, the selected radio channel can be accessed by the sender for transmitting data frames 111 on the selected channel during the respective access time interval.
  • every mobile station 201-203 and the wireless access point 1 stops transmitting data frames 111 on the requested channel. By doing so, collisions or data frame losses, re ⁇ spectively in the wireless communication system can be avoided.
  • the wireless access point requests analysis access to the selected radio channel by sending a second ready to send data frame 121 to a selected mobile station 201-203.
  • the second ready to send data frame 121 indicates an analysis time interval the analysis access is requested for by the wireless access point 1.
  • the blocking period 102 in which the single radio interface 11 is not available for transmitting data frames 111 already begins by sending the second ready to send data frame 121.
  • the second ready to send data frame 121 is acknowledged by sending a second clear to send data frame 122 from the selected mobile station 201-203 to the wireless access point 1. Accordingly, if the second clear to send data frame 122 is received by the wireless access point 1, the wireless access point 1 can access to the selected radio channel for running the spectrum analysis during the analysis time interval which equals the spectrum analysis period 103. During the analysis time interval, every mobile station 201-203 in range of the wireless access point 1 stops transmitting data frames 111 on the selected channel. Moreover, the wireless access point 1 is switched from a wireless transmission mode to a spectrum analyzer mode during the analysis time interval, e.g. by means of the controller 12.
  • the col ⁇ lected measurement signals 112 relating to the spectrum analysis only contain signals that disturb WLAN traffic. With a tra ⁇ ditional spectrum analyzer this would be not possible because traditional spectrum analyzers are not capable of sending WLAN frames, especially RTS/CTS frames.

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

Abstract

Pour transmettre des trames de données dans un système de communication sans fil entre au moins un dispositif sans fil et au moins une station mobile, le dispositif d'accès sans fil comprenant une interface radio unique, l'interface radio unique du dispositif d'accès sans fil est utilisée à la fois pour communiquer avec la station mobile et pour effectuer une analyse spectrale concernant un canal radio sélectionné. Au moyen de l'analyse spectrale, les interférences sur le canal radio sélectionné sont déterminées. Pour demander l'accès au canal radio sélectionné, le dispositif d'accès sans fil envoie une trame de données prête à envoyer à une station mobile sélectionnée. Cette trame de données prête à envoyer est acquittée en envoyant en retour une trame de données prêt à envoyer en retour vers le dispositif d'accès sans fil. Si la trame de données prête à envoyer est reçue par le dispositif d'accès sans fil, l'analyse spectrale concernant le canal radio sélectionné peut être effectuée par le dispositif d'accès sans fil.
PCT/CN2014/072154 2014-02-17 2014-02-17 Procédé de transmission de trames de données dans un système de communication sans fil et dispositif d'accès sans fil WO2015120628A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/072154 WO2015120628A1 (fr) 2014-02-17 2014-02-17 Procédé de transmission de trames de données dans un système de communication sans fil et dispositif d'accès sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/072154 WO2015120628A1 (fr) 2014-02-17 2014-02-17 Procédé de transmission de trames de données dans un système de communication sans fil et dispositif d'accès sans fil

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WO2015120628A1 true WO2015120628A1 (fr) 2015-08-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019081002A1 (fr) 2017-10-25 2019-05-02 Huawei Technologies Co., Ltd. Accès sans fil basé sur la sensibilité au mouvement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6714605B2 (en) * 2002-04-22 2004-03-30 Cognio, Inc. System and method for real-time spectrum analysis in a communication device
CN101926189A (zh) * 2007-12-11 2010-12-22 诺基亚公司 在频谱感测中选择协作用户的方法和装置
CN103155616A (zh) * 2010-08-16 2013-06-12 高通股份有限公司 促进认知无线电通信中的感测

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6714605B2 (en) * 2002-04-22 2004-03-30 Cognio, Inc. System and method for real-time spectrum analysis in a communication device
CN101926189A (zh) * 2007-12-11 2010-12-22 诺基亚公司 在频谱感测中选择协作用户的方法和装置
CN103155616A (zh) * 2010-08-16 2013-06-12 高通股份有限公司 促进认知无线电通信中的感测

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019081002A1 (fr) 2017-10-25 2019-05-02 Huawei Technologies Co., Ltd. Accès sans fil basé sur la sensibilité au mouvement
US11296775B2 (en) 2017-10-25 2022-04-05 Huawei Technologies Co., Ltd. Motion awareness-based wireless access

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