EP1884905A1 - Gestion de canal pour un réseau de communication radio asynchrone - Google Patents

Gestion de canal pour un réseau de communication radio asynchrone Download PDF

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Publication number
EP1884905A1
EP1884905A1 EP06118218A EP06118218A EP1884905A1 EP 1884905 A1 EP1884905 A1 EP 1884905A1 EP 06118218 A EP06118218 A EP 06118218A EP 06118218 A EP06118218 A EP 06118218A EP 1884905 A1 EP1884905 A1 EP 1884905A1
Authority
EP
European Patent Office
Prior art keywords
subscriber
radio
receiving
telegram
announcement
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06118218A
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German (de)
English (en)
Inventor
Frank Thiele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Building Technologies HVAC Products GmbH
Siemens Building Technology Fire and Security Products GmbH and Co OHG
Original Assignee
Siemens Building Technologies HVAC Products GmbH
Siemens Building Technology Fire and Security Products GmbH and Co OHG
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 Building Technologies HVAC Products GmbH, Siemens Building Technology Fire and Security Products GmbH and Co OHG filed Critical Siemens Building Technologies HVAC Products GmbH
Priority to EP06118218A priority Critical patent/EP1884905A1/fr
Priority to PCT/EP2007/057582 priority patent/WO2008015124A1/fr
Publication of EP1884905A1 publication Critical patent/EP1884905A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/007—Details of data content structure of message packets; data protocols
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors

Definitions

  • the present invention relates to the field of wireless communication.
  • the present invention relates to a method for asynchronous radio transmission in a communication network having at least two subscribers each having a transmitter and a receiver.
  • the present invention further relates to a communication device and a radio communication network, which are set up for carrying out the method according to the invention for asynchronous radio transmission.
  • the invention relates to a computer-readable storage medium and to a program element which contain instructions for carrying out the method according to the invention for asynchronous radio transmission.
  • radio is an almost ideal transmission medium. Devices with radio technology are quick to install and easy to adapt to changing requirements. This applies in particular to modern building technology, in which a building can be protected from fires and / or burglary by a danger detection system.
  • a disadvantage of radio communication networks affects the relatively short range in buildings at carrier frequencies in the gigahertz range. If so-called repeaters are used to increase the range, their high energy consumption usually requires mains-powered devices. This is especially true for radio equipment in the new short range device radio band between 868 and 870 MHz.
  • the radio transmission system Sigmaspace of the company Siemens which uses a large number of independent radio channels. In case of a fault, the communication channel can thus be changed at any time.
  • Sigmaspace uses a channel switching procedure based on fully synchronous time management, using up to five different radio channels in each time slice, which are used according to a fixed scheme.
  • sigma space also has the disadvantage that if a transmitter is not transmitting, the corresponding time segment remains unused, so that the transmission channel is not optimally utilized.
  • a method for asynchronous radio transmission in a danger detection system which operates on repeaters and yet designed to save power, so that a battery operation is possible even over a longer period of operation.
  • the receiving devices are cyclically switched on at predetermined times.
  • Send-willing participants send an announcement telegram, which means that the participants intended for the reception remain switched on in the case of reception until the end of the entire announcement telegram, and in the event that no announcement telegram is received, are switched off again.
  • the announcement telegram becomes a time transmitted, to which the receiver turns on again to receive the actual data or user message.
  • the invention has for its object to provide a simple method for channel management for asynchronous radio communication networks, which still allows reliable communication between two radio partners in the event of a malfunction of a radio channel.
  • Independent claim 1 describes a method for asynchronous radio transmission in a communication network with at least two subscribers, each having a sender and a receiver.
  • the method according to the invention comprises the following steps: (a) switching on the receiver at predetermined switch-on times for a respective readiness to receive, (b) sending an announcement telegram from a transmitting subscriber to a receiving subscriber during a period of time which overlaps with a receiving readiness of the receiving subscriber.
  • the announcement telegram has at least a first announcement signal on a first radio channel and at least a second advertisement signal transmitted on a second radio channel.
  • the receiver of the receiving subscriber switches over to the second radio channel for a second reception period.
  • the inventive method is based on the finding that in an asynchronous radio network, a secure data transmission can be ensured even in a radio-technically difficult environment, that a sending subscriber sends an announcement telegram on different radio channels.
  • the announcement telegram comprises several announcement signals, which are each sent on a radio channel.
  • the announcement signals are intercepted by the receiving party.
  • the receiver of the receiving subscriber is switched to the second radio channel.
  • the radio transmission between sending participant and receiving participant thus takes place on the principle of "trial and error" or "try and error”. In this case, first a radio transmission on the one radio channel is tried and, if this should not be successful, changed to another Finkkanal. A previous communication between the two radio subscribers with regard to the radio channels to be used is therefore not necessary.
  • the described channel management is thus completely asynchronous.
  • asynchronous radio transmission in this context means a data transmission in which all radio subscribers act independently of one another in terms of time. Each participant has his own time base. There are no time windows assigned to each subscriber by a uniform system clock, in which the subscriber in question may communicate.
  • the method according to the invention has the advantage that secure communication is possible between different radio subscribers even if one or even if several radio channels are disturbed, in particular by external influences such as, for example, sabotage. It is assumed that the probability of a disturbance of the radio link on several channels at the same time is significantly lower than a fault on a single used Finkkanal.
  • the method according to the invention is by no means limited to the use of two different radio channels.
  • the number of different announcement signals that are sent in total on the different radio channels increases accordingly. In this case, it is switched over to another radio channel until a valid announcement signal is received by the receiving subscriber.
  • the more different radio channels are available for communication the greater the transmission reliability.
  • the receivers are turned on at cyclically predetermined switch-on times, so that the duty cycle or the duty ratio of the receiver and thus also the power consumption of the receiver can be set freely depending on the particular application.
  • an occasional synchronization of the time bases of the two radio subscribers, i. the sending participant and the receiving participant makes sense.
  • the sending subscriber can at least approximately know when the receiver of the receiving subscriber will be switched on. Accordingly, he can then adjust his broadcasting activity in time to the reception readiness of the receiving subscriber. In this way, long transmission durations can be avoided and the power consumption of the transmitting users can be reduced accordingly.
  • the second announcement signal is sent immediately after the first announcement signal.
  • the announcement message has a plurality of successive at least first and second announcement signals.
  • the repeated transmission of the at least first and second announcement signals is then continued until the receiver of the receiving subscriber has possibly listened to all the radio channels by means of a respective respective reception period. In this way it is ensured that even if only in the last radio channel a trouble-free transmission of a corresponding announcement telegram is possible, this can actually be completely absorbed by the receiving party.
  • the first receiving period and / or the second receiving period is at least twice as long as the duration of an announcement signal. If a plurality of different announcement signals are transmitted by the transmitting subscriber, the likelihood that a corresponding announcement signal can be completely received on the relevant radio channel is increased as the length of the first receiving period and / or of the second receiving period increases.
  • Particularly secure communication can be achieved if, in the case of immediately consecutive announcement signals of the same duration, the first reception period and / or the second reception period is at least one announcement signal duration longer than all the different announcement signals together. In that case, it is then ensured that at least one announcement signal can always be received in principle by the receiving subscriber, both with regard to the temporal overlap and with regard to the radio channel used. Of course, this sets a sufficiently good wireless connection on the respective Channel of the reception period ahead. In the case of two different radio channels, this means that the first receiving period and / or the second receiving period is at least three times as long as the duration of an announcement signal.
  • the method for asynchronous radio transmission additionally comprises the following step: sending a payload telegram by the sending subscriber to the receiving subscriber on the first radio channel at a first time, which was communicated to the receiving subscriber by means of the announcement telegram.
  • the transmitting subscriber can thus already inform his possible receiving participants about the planned transmission time at an early stage. This creates the possibility that the receiving subscriber can temporarily switch off after receiving a valid announcement signal and is turned on again shortly before the transmission time. In this way, the power consumption of the receiving subscriber can be significantly reduced.
  • the announcement signal may also contain information on which radio channel the payload telegram is sent. Thus, a readiness to receive accidentally be avoided on the wrong radio channel.
  • the payload telegram is independent of a successful transmission of a first advertisement signal is sent.
  • the sending subscriber does not know at the beginning of the broadcast or does not yet know which of the transmission channels available in principle is ultimately used for the correct data communication between the two radio subscribers.
  • the method for asynchronous radio transmission additionally comprises the step of: sending an acknowledgment signal by the receiving subscriber to the transmitting subscriber on the first radio channel if the payload telegram has been correctly received by the receiving subscriber.
  • the method for asynchronous radio transmission additionally comprises the following steps: (a) switching the transmitter of the transmitting subscriber to the second radio channel, if the payload telegram was not received correctly by the receiving subscriber, and (b) transmitting the payload telegram by the transmitting one Subscriber to the receiving subscriber on the second radio channel at a second time, which was communicated to the receiving subscriber by means of the announcement telegram.
  • the second radio channel In the event of a malfunction of the first radio channel, the second radio channel is thus automatically avoided. In this case, switching over to the second radio channel can take place system-internally, without an operator of the communication network having to hear something about the channel change that has taken place. The ease of use of the communication network is thus in spite of the described channel management, in which the data transmission over different radio channels can be made in comparison not reduced to single-channel radio communication networks.
  • the method for asynchronous radio transmission additionally comprises the following step: sending an acknowledgment signal by the receiving subscriber to the transmitting subscriber on the second radio channel if the payload telegram has been received correctly by the receiving subscriber.
  • the user telegram contains an address information which identifies the receiving subscriber among a plurality of possible subscribers of the communication network.
  • announcement signals can contain this address information. This would have the advantage that the selected participant or addressee would be announced at an early stage, so that only this participant would have to adjust to the subsequent reception of the useful telegram.
  • address information contained in the Nutztelegram has the advantage that announcement signals can be used with a relatively small amount of data and thus with a short duration. In this way, the total resulting radio load through the communication network is not significant even with a plurality of different transmission channels greater than the radio load of comparable single-channel asynchronous communication networks.
  • Independent claim 10 provides a communication device for a multi-user radio communication network.
  • the communication device comprises (a) a transmitter, (b) a receiver, and (c) a data processing device.
  • the data processing device which is coupled to the transmitter and to the receiver, is set up such that the above-mentioned method can be carried out.
  • the communication device according to the invention is a participant of the radio communication network.
  • a radio communication network which has at least two of said communication devices.
  • the radio communication network is designed as a danger detection system, in particular for monitoring buildings.
  • the individual participants may have sensors that detect a fire, for example, or detect a burglary attempt as a motion detector.
  • the participants can also take over central functions, with which, for example, by a corresponding Operational input to an input unit of a subscriber specific participants or all participants of the hazard detection system can be converted into a modified operating mode. It is also possible that individual participants have actuators to close doors, turn on or off lights and / or to set blinds in motion.
  • a computer-readable storage medium in which a program for operating a radio communication network with at least two participants, each having a transmitter and a receiver is stored.
  • the program is executed by a data processing device, the above-mentioned method of radio transmission is performed in a communication network.
  • a program element for operating a radio communication network is provided with at least two participants, each having a transmitter and a receiver.
  • the program element is executed by a data processing device, the above-mentioned method of radio transmission is performed in a communication network.
  • the described method can thus be implemented in a simple manner by changing a software into already existing radio communication networks.
  • the method described here requires much less system resources, since the operation of an asynchronous communication network does not require constant synchronization of the individual subscribers or highly accurate timers for maintaining a common time base.
  • the program element may be implemented as a computer-readable instruction code in any suitable programming language such as JAVA, C ++, etc.
  • the program element can be stored on a computer-readable storage medium (CD-ROM, DVD, removable drive, volatile or non-volatile memory, built-in memory / processor, etc.).
  • the instruction code may program a computer or other programmable device to perform the desired functions.
  • the program element may be provided in a network, such as the Internet, from where it can be downloaded by a user as needed.
  • the invention can be implemented both by means of a computer program, i. software, as well as by means of one or more special electrical circuits, i. in hardware or in any hybrid form, i. using software components and hardware components.
  • FIG. 1 shows a radio hazard alarm system 100 which has a first subscriber 101 and a second subscriber 111.
  • the radio hazard detection system 100 may also have other not shown participants and / or a central office.
  • the first user 101 has a radio module 102 which comprises a transmitter 103 and a receiver 104.
  • the radio module 102 is coupled to an antenna 105.
  • the first subscriber 101 further includes a microprocessor 106 coupled to the radio module 102.
  • the first participant also has a detection device 107, which is coupled to the microprocessor 106.
  • the detection device 107 may be, for example, a fire detector, a burglary detector or any other detector for security.
  • the second subscriber 111 likewise has a radio module 112, which comprises a transmitter 113 and a receiver 114.
  • the radio module 112 is coupled to an antenna 115.
  • the second subscriber 111 further comprises a microprocessor 116, which is coupled to the radio module 112, and a detection device 117, which is coupled to the microprocessor 116.
  • the two radio subscribers 101 and 111 communicate with each other via a radio transmission link 108 which is formed between the antenna 105 and the antenna 115.
  • a radio subscriber can also have operating elements, so that the relevant subscriber, who may be formed with or without detection device, can transmit entered commands to the other subscriber or to a central station (not shown).
  • a system controller monitoring the entire radio danger detection system can be provided, with which a further processing of a danger message is carried out.
  • the fire department alarmed, any fire doors closed and / or an alarm signal is triggered in a building.
  • FIG. 2 shows a time diagram of an asynchronous radio transmission within a radio communication network comprising a first subscriber 201, a second subscriber 211 and a third subscriber 221. There are two transmission channels, a first transmission channel K0 and a second transmission channel K1 available.
  • the time t is plotted on the abscissa and the received or transmitted level P of the respective radio subscriber 201, 211, 221 is plotted on the ordinate.
  • the illustrated radio scenario begins with a detection of a triggering event 230 by a detection device of the first subscriber 201, which is also referred to below as a transmitting subscriber 201.
  • the subscriber 201 Immediately following the detection 230, the subscriber 201 begins to send a so-called announcement telegram 240, which has a plurality of immediately consecutive announcement signals 241 and 242.
  • announcement telegram 240 which has a plurality of immediately consecutive announcement signals 241 and 242.
  • first announcement signals 241 are transmitted on the first radio channel K0 and second announcement signals 241 on the second radio channel K1.
  • the announcement telegram 240 may also be delayed, ie with a certain delay in relation to the detection 230 of the triggering event. This may be the case in particular if the subscriber 201 is aware of at least approximately the reception times of the other subscribers 211 and 221. Namely, in this case, the subscriber 201 can transmit the announcement telegram 240 only during a shortened period of time within which the receivers of the subscribers 211 and 221 are actually ready to receive.
  • the receivers of the subscribers 211 and 221, which are also referred to below as receiving subscribers, are switched on within a standby mode 260 or 280.
  • the readiness to receive 260 or 280 begins at an initial time, which is after the beginning of the transmission of the announcement telegram 240.
  • the readiness for reception 260 or 280 ends at an end time which is before the end of the transmission of the announcement telegram 260. In this way it is ensured that a sufficient temporal overlap between the transmission of the announcement telegram 240 and the reception standby 260 or 280 is ensured, so that at least one of the announcement signals 241 or 242 can be received correctly.
  • the receiver is first set to the first radio channel K0 for a first reception period 261 or 281 and then to the second radio channel K1 for a second reception period 262 or 282.
  • the time length of the two reception periods is so large in comparison to the duration of the individual announcement signals 241, 242 that at least a first announcement signal 241 and a second announcement signal 242 in the time window of each of the two reception periods 261 and 262, 281 and 282 falls.
  • the first radio channel K0 is already sufficiently strong that interference-free radio transmission takes place on the channel K0. Accordingly, the subscriber 211 already receives a first announcement signal 241 at the time t3. Accordingly, if this reception is detected sufficiently fast by the subscriber 211, the receiver can be switched off in the second reception period 262 for reasons of power saving. The same applies to the subscriber 221. This receives at the time t2 a first announcement signal 241, so that possibly the Receiver of the subscriber 221 in the second receiving period 282 can be turned off.
  • all the first announcement signals 241 contain the information about the time at which the transmitting subscriber 201 sends a payload message 251 on the first channel K0.
  • all second announcement signals 242 contain the information as to what time a transmitting telegram 252 is possibly sent by the transmitting subscriber 201 on the second channel K1.
  • the two receiving subscribers 211 and 221 can adjust to it and turn on their receivers in time. By temporarily switching off the receiver, the power consumption of the receiving subscribers 211 and 221 can thus be reduced.
  • the useful message 251 transmitted by the transmitting subscriber 201 is received both by the subscriber 211 (see reference numeral 271) and by the subscriber 221 (see reference numeral 291) ,
  • the reception 271 of the useful telegram 251 begins at a point in time which lies around the time interval ⁇ t3 after the time t3.
  • the reception 291 of the useful telegram 251 begins at a time which lies around the time interval ⁇ t 2 after the time t 2.
  • this is the subscriber 211.
  • This can thus after complete reception 271 of the payload 251 on the first channel K0 an acknowledgment signal 276 also on the channel K0 send to the sending party 201.
  • an acknowledgment signal 276 also on the channel K0 send to the sending party 201.
  • the data exchange between the sending subscriber 201 and the receiving subscriber 211 ends.
  • Resending the User telegram from the subscriber 201 within a time window 252 is thus no longer required as switching on the receiver of the transmitting subscriber 201 within a time window 257, which would be provided for the receipt of an acknowledgment signal.
  • the receiving subscriber 221 Upon receiving an evaluation of the address information of the received payload message 251, the receiving subscriber 221 recognizes that the payload message 251 was not intended for it. Accordingly, in the time window 296, which would possibly be used for another address information for the transmission of an acknowledgment signal on the channel K0, no transmission of an acknowledgment signal from the subscriber 221 and the transmitting subscriber 201.
  • the subscribers 311 and 321 are already informed when the corresponding announcement signal 342 is received when the transmitting subscriber 301 will transmit the user data on the channel K1.
  • the receivers of the subscribers 311 and 321 can be temporarily turned off, thus contributing to the power saving.
  • the sending party 301 since the sending party 301 does not (yet) have this information regarding the availability of the radio channels, it will first try to send the payload telegram 351 on the channel K0. However, this useful message can not be received by either the subscriber 311 or the subscriber 321 because of the interference with the radio channel K0. Consequently, no acknowledgment signal is sent, which would confirm receipt of the payload telegram 351. Within the time window 356, which is provided for the receipt of an acknowledgment signal, the subscriber 301 can thus consequently receive no corresponding acknowledgment signal. This has the consequence that a channel change 353 is carried out, so that subsequently the useful telegram, which is now provided with the reference numeral 352, is transmitted on the channel K1.
  • the reception 372 of the useful telegram 352 by the subscriber 311 begins at a time which lies around the time interval ⁇ t 2 after the time t 2.
  • the reception 392 of the useful telegram 352 by the subscriber 321 starts at a time which lies around the time interval ⁇ t1 after the time t1.
  • the useful telegram 352 also contains address information, according to which the subscriber 311 is the addressee of the useful telegram 352. Accordingly, after receiving 372 of the payload telegram 352, the receiving subscriber 311 sends an acknowledgment signal 377 to the transmitting subscriber 301.
  • the subscriber 321 not provided as addressee accordingly does not transmit an acknowledgment signal in the time window 397. With the reception 357 of the acknowledgment signal 377 by the first participant 301, the data exchange between the sending participant 301 and the receiving participant 311 ends.
  • This application describes channel management for asynchronous radio communication networks.
  • each complete announcement signals 341, 341 sequentially on different Radio channels K0, K1 transferred.
  • the receivers of the receiving subscribers 311, 321 of the communication network are also set sequentially within different receiving periods 361, 362, 381, 382 to the different radio channels K0, K1.
  • the transmission times of the announcement signals 341, 342 and the corresponding reception periods 361, 362, 381, 382 overlap.
  • the receiving subscriber can receive an announcement signal 342 on an undisturbed channel K1 and a subsequent data exchange 352 can also be performed on this undisturbed channel K1.
  • the announcement signals 341, 342 preferably contain the information as to when the data exchange 352 takes place, so that a receiving user 311 can selectively switch on his receiver at the time of transmission of the corresponding user data 352.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
EP06118218A 2006-07-31 2006-07-31 Gestion de canal pour un réseau de communication radio asynchrone Withdrawn EP1884905A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06118218A EP1884905A1 (fr) 2006-07-31 2006-07-31 Gestion de canal pour un réseau de communication radio asynchrone
PCT/EP2007/057582 WO2008015124A1 (fr) 2006-07-31 2007-07-23 Gestion de canal pour réseaux de radiocommunication asynchrones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06118218A EP1884905A1 (fr) 2006-07-31 2006-07-31 Gestion de canal pour un réseau de communication radio asynchrone

Publications (1)

Publication Number Publication Date
EP1884905A1 true EP1884905A1 (fr) 2008-02-06

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Application Number Title Priority Date Filing Date
EP06118218A Withdrawn EP1884905A1 (fr) 2006-07-31 2006-07-31 Gestion de canal pour un réseau de communication radio asynchrone

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EP (1) EP1884905A1 (fr)
WO (1) WO2008015124A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484880A2 (fr) * 1990-11-05 1992-05-13 Norbert Schaaf Système radio d'alarme
EP0911775A2 (fr) * 1997-09-30 1999-04-28 Siemens Aktiengesellschaft Procédé de transmission radio dans un système de signalisation d'alarmes
EP1282094A2 (fr) * 2001-08-03 2003-02-05 Siemens Gebäudesicherheit GmbH & Co. OHG Méthode de transmission hertzienne dans un système d'alarme

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484880A2 (fr) * 1990-11-05 1992-05-13 Norbert Schaaf Système radio d'alarme
EP0911775A2 (fr) * 1997-09-30 1999-04-28 Siemens Aktiengesellschaft Procédé de transmission radio dans un système de signalisation d'alarmes
EP1282094A2 (fr) * 2001-08-03 2003-02-05 Siemens Gebäudesicherheit GmbH & Co. OHG Méthode de transmission hertzienne dans un système d'alarme

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Publication number Publication date
WO2008015124A1 (fr) 2008-02-07

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