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WO2006035027A1 - Procede d'acces multiple pour trafic de donnees isochrone ou quasi-isochrone - Google Patents

Procede d'acces multiple pour trafic de donnees isochrone ou quasi-isochrone Download PDF

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Publication number
WO2006035027A1
WO2006035027A1 PCT/EP2005/054845 EP2005054845W WO2006035027A1 WO 2006035027 A1 WO2006035027 A1 WO 2006035027A1 EP 2005054845 W EP2005054845 W EP 2005054845W WO 2006035027 A1 WO2006035027 A1 WO 2006035027A1
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WO
WIPO (PCT)
Prior art keywords
data
ack
station
transmission
transmitting
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.)
Ceased
Application number
PCT/EP2005/054845
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German (de)
English (en)
Inventor
Karsten BRÜNINGHAUS
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 AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 AG, Siemens Corp filed Critical Siemens AG
Publication of WO2006035027A1 publication Critical patent/WO2006035027A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements

Definitions

  • the present invention relates to a multiple access method for isochronous or quasi-isochronous ⁇ traffic and in particular to a method for realizing a data traffic in a CSMA / CA communication system with decentralized multiple access with Kollisionsvermei ⁇ tion according to the modified standard IEEE 802.11, where a predictive reservation of resources is performed to reduce signaling overhead and to improve QoS.
  • CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
  • CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
  • the IEEE 802.11 standard specifies in particular the multiple access control (MAC) method and the physical characteristics for so-called WLAN (Wireless Local Area Network) communication systems.
  • MAC multiple access control
  • WLAN Wireless Local Area Network
  • a so-called medium access control unit supports the components of a physical layer depending on availability of the spectrum with regard to its access authorization to the transmission medium.
  • the coordination function logic is active only in one station of a communication system, as long as the network is in operation.
  • DCF distributed coordination function
  • the same coordination function logic is active in each station of the communication system as long as the network is in operation.
  • FIGS. 1 and 2 To illustrate a decentralized multiple access functionality to a transmission medium, an exemplary configuration according to the IEEE 802.11 standard will first be described with reference to FIGS. 1 and 2.
  • FIG. 1 shows a simplified representation for illustrating a spatial distribution or a topology of a plurality of stations S 1 to S 5 within such a communication system.
  • the station S2 represents a transmitting station or a transmitter and S1 a receiving station or a receiver, which lies in the radio range of the transmitting station S2.
  • a station S3 in a radio range from the transmitting station S2 and a station S4 within a radio range of the receiving station S1 are located.
  • the station S5 is in the topology of Figure 1 outside a radio range of the transmitting station S2 and the receiving station Sl.
  • FIG. 2 shows a simplified data frame structure for the data exchange of a decentrally organized multiple access system (DCF) according to the IEEE 802.11 standard.
  • DCF decentrally organized multiple access system
  • DIFS DCF interframe space
  • RKS Ready To Send
  • the receiving station S1 selected by the transmitting station S2 transmits a ready-to-receive signal CTS (Clear To Send) for indicating a readiness for reception, within which a "Duration" block is again provided Network access vector information NI may be included.
  • the transmitting station S2 sends a user data packet Data from the transmitting station S2 to the receiving station S1, in which the network access vector information NI can again be contained within a "Duration" block.
  • the receipt of the user data packet Data is confirmed by the receiving station S1 by means of an acknowledgment signal ACK (Acknowledge).
  • the network access vector information NI which is contained in particular in the transmit and receive ready signals RTS and CTS, sets a so-called network access vector NAV in the other stations S3 and S4 of the communication network located in the reach of the transmitting or receiving station S2 and Sl (Network Allocation Vector), which specifies how long a transmission to the radio medium or the transmission medium can not be performed by the respective station. More precisely, the further stations S3 and S4 lying within the hearing range are assigned a broadcasting ban for the period of time defined by the network access vector information NI. The access to the communication system or the transmission medium is only again possible after expiration of this period. In the subsequent contention window, in order to avoid a collision, a further delay takes place around a due backoff time.
  • the backoff time here is usually a random variable, which is different for each user and, after a successful access to the medium, is repeatedly "rescored" or randomly determined by the respective user.
  • the invention has for its object to provide a method for transmitting data signals in a kommunikati ⁇ onssystem with decentralized organized multiple access to a transmission medium, which allows for improved Ef ⁇ efficiency and improved support for a "Quality of Service” (QoS) ,
  • the network access vector information is repeated by the receiving station in its ready-to-receive signal, whereby a spatial range of the pre-serve is increased and so-called “hidden nodes" are avoided.
  • the transmitting station can transmit transmission parameters for the desired isochronous data traffic to the receiving station, the receiving station depending on an analysis of this transmission path. parameter and / or its resource situation releases isochronous traffic. In this way, already made reservations in the vicinity of the receiving station, which are not yet known to the transmitting station (because they originate from stations that are in the "hearing range" of the receiver but not of the transmitter), can be taken into account.
  • the additional network access vector information transmitted in the ready-to-send and / or ready-to-receive signal can be retrieved again in the user data packet, whereby a complete reservation of the transmission rights can be realized.
  • a further additional network access vector information can be sent in the acknowledgment signal of the receiving station, whereby a flexible adaptation of the system is made possible taking into account the analysis of the transmission parameters and / or the resource situation in the receiving station ,
  • the confirmation signal can also be used for channel identification.
  • the time intervals of the user data packets in the steady state defined by the additional network access vector information are preferably determined as integral multiples of a common time constant of the communication system, whereby the multiplexing of several independent data streams on the basis of the described reservation mechanism can be made substantially more efficient.
  • FIG. 1 shows a simplified representation of a spatial topology of stations in a communication system
  • FIG. 2 shows a signaling structure for illustrating a conventional method for transmitting data signals in a communication system with centrally organized multiple access to a transmission medium on the basis of a CSMA / CA;
  • FIG. 3 shows a signaling structure for illustrating a method according to the invention for transmitting data signals in a communication system with decentralized multiple access to a transmission medium.
  • FIG. 3 shows a simplified representation of a signaling structure for illustrating a multiple access method according to the invention with collision avoidance for isochronous data traffic, the same reference symbols designating the same or corresponding elements or phases as in FIG. 2 and a repeated description being omitted below.
  • a modification of the conventional CSMA / CA method for isochronous data traffic shown in FIG. 2 is proposed such that the necessary resources (in this case time resources) for a respective subsequent user data packet are already present when transmitting a current user data packet is pre-reserved.
  • This essentially corresponds to an implicit prioritization of the isochronous data traffic compared to a so-called burst-like data traffic.
  • QoS quality of service
  • QoS Quality of service
  • the signaling structure according to the invention has an initialization phase for initializing the data connection for the isochronous or quasi-isochronous data traffic and a steady state in which a data connection for isochronous or quasi-isochronous data traffic is installed.
  • the transmitting station S2 which wishes to issue isochronous data traffic for a certain period of time, firstly transmits the transmission parameters ÜP for this isochronous traffic, such as an average data rate, permissible delay times, etc., to the possible receiving station Sl forwarded.
  • the receiving station Sl can first decide whether the requested service, ie i-sochronic or quasi-isochronous data traffic with the requested parameters ÜP, can be supported at all.
  • the receiving station S1 can release the isochronous or quasi-isochronous data traffic depending on an analysis of the transmission parameters transmitted by the transmitting station S2 and / or its local resource situation, or else postpone a shift in the reservation proposed by the transmitter. initiate window for the transmission of the first packet.
  • the time intervals between two reservations i. E. between two Nutz Schemepake ⁇ th data or two acknowledgment signals ACK (if present) preferably as integer multiples of a common time constant of the communication system set.
  • a plurality of isochronous or quasi-isochronous data traffic streams can be interleaved between adjacent station pairs, without causing collisions or the need for a reorganization, at least if certain maximum specifications for the packet length are adhered to.
  • a transmission ready signal RTS for indicating a readiness to send having a current network access vector information NI for the purpose of serving a current transmission right with a predetermined time duration is therefore first transmitted from a transmitting station S2 to the network. Consequently, the current network access vector information NI of the ready-to-send signal RTS issues a transmission prohibition for all stations which can hear the transmitting station S2 or are within its range, for example a station S3.
  • the additional network access vector information FNI effects a reservation of a transmission right for the transmitting station S2 at all stations with respect to a time ti for a time duration ⁇ ti, which in turn can hear the station S2.
  • the receiving station S1 can provide additional network access vector information FNI corresponding to the FNI proposal or modified to the ready-to-receive signal CTS to be sent for the future payload packet of the transmitting station Attach S2.
  • the additional network access vector information FNI causes a reservation of a transmission right for the transmitting station S2 at all stations, which in turn can hear the station S2 (eg station S4), for a period of time ⁇ ti after a delay time period ti after the reception ready signal has been sent CTS begins.
  • the conventional current network access vector information NI (NAV information) in the receive ready signal CTS can also be repeated unchanged or changed, as a result of which, in particular, a range for the reservation of the
  • Broadcasting rights increased. More precisely, this also informs the station S4 with regard to the reservation of the transmission right for the station S1, with all stations of the communication network which can hear the receiving station S1 or within its range receive a broadcasting ban. Because the
  • Station S5 is outside the range of the transmitting station S2 and the receiving station Sl, this station would remain unaffected according to Figure 1 thereby.
  • the receiving station S1 can carry out an overhaul or analysis of the channel assignment to determine whether the proposed occupation is compatible with the in particular isochronous or quasi-isochronous traffic streams at its local location. If this is not the case, the receiving station S1 could forward such information about the seizure of the channel from its local point of view to the transmitting station S2, so that the transmitting station S2, for example, occupies new resources which are more suitable for both stations or defines new transmission parameters ÜP.
  • the receiving station S1 would repeat the additional network access vector information FNI unchanged, so that all stations, such as the Station S4, within reach of this receiving station Sl, but out of range of the transmitting station S2, this Mark resources as occupied. More specifically, a future transmission right FNAV (CTS) reservation is made for the station Sl after a delay period ti and for a reserved additional time period ⁇ ti. For this future reservation, all further stations which can hear the receiving station S1 receive in turn a broadcasting ban.
  • CTS transmission right FNAV
  • the additional network access vector information FNI can be adapted by the receiving station S1 as a function of a performed analysis with respect to the transmission parameters and / or its resource situation, wherein such modified or adapted network access vector information can also be repeated in the user data packet da ⁇ ta , More precisely, a reservation of a future transmission right FNAV (DATA) for the station S3 occurs after a delay time period ti 'after the user data packet data and for a reserved additional time period ⁇ ti. For this future reservation, all other stations that can hear the transmitting station S2, again a broadcast ban. In the subsequent steady state, the receiving station S1 can respond according to FIG. 3, for example, with a positive or negative acknowledgment signal ACK for confirming the preservation of the user data packet Data.
  • DATA transmission right FNAV
  • a further additional network access vector information FNI can be sent in the actuation signal ACK, wherein either the original additional network access vector information FNI is repeated or an additional network access vector information modified on the basis of an analysis is determined.
  • a reservation of a future transmission right FNAV (ACK) for the station S4 takes place after a delay time t 2 after the acknowledgment signal ACK and for a reserved additional time period At 2 .
  • a time assignment in the form of the additional network access vector information FNI for the next-but-one payload data packet can be transmitted.
  • a reservation of a future transmission right FNAV (DATA) for the station S3 takes place after a delay period t 2 'after the user data packet data and for a reserved additional time period At 2 .
  • the positioning of such an ACK signaling immediately before a new user data packet data has the advantage that a channel identification in the transmitting station S2 can also be carried out on the basis of which a timely adaptation of the parameters of the physical layer (PHY parameters) is possible ,
  • the transmitting station S2 can repeat this additional network access vector information FNI and, depending on the state of the acknowledgment signal ACK, either append the (obviously incorrectly transmitted) old data sequence or send a new data sequence as the useful data packet data.
  • isochronous or quasi-isochronous data traffic may also have some dynamics, it is possible to set the reservation parameters of the additional network access vector information FNI, ie the reserved time periods ⁇ ti and ⁇ t 2 and the delay periods ti, ti 'and t 2 , t 2 * adapt to occupancy.
  • FNI additional network access vector information
  • Such an adaptation between the stations could, for example, be handled via the higher layers of an ISO layer model.
  • the length of the time intervals ⁇ ti, At2, ... may well vary, but what tion a Varia ⁇ of the time intervals t ⁇ ', t 2', ... implied.
  • the position of the additional network access vector information FNI within the useful data packet data or the acknowledgment signal ACK in principle does not matter in the closed state, but preferably can also be placed at the beginning so that the other stations do not first The entire data packet must be evaluated, but the analysis of the packet can be interrupted at an early stage if it has collected all relevant information.
  • each acknowledgment signal ACK and user data packet data can in addition to the additional network access vector information FNI itself also contain the current network access vector information NI.
  • the invention has been described above with reference to a multiple access method with collision avoidance for isochronous data traffic according to standard IEEE 802.11. However, it is not limited to this and equally includes alternative distributed access methods.
  • the network access vector information has been arranged at predetermined locations within the respective data packets.
  • this arrangement is only an example and can be done in the same way in other places.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour envoyer des signaux de données dans un système de communication, par accès multiple décentralisé à un support de transmission. Selon l'invention, un paquet de données utiles (données) est envoyé par une station d'émission (S2) à une station de réception (S1), et un signal de confirmation (ACK) destiné à confirmer la réception du paquet de données utiles (données) est envoyé en retour par la station de réception (S1). Le paquet de données utiles (données) et/ou le signal de confirmation (ACK) comporte(nt) une information de vecteur d'accès réseau supplémentaire (FNI) pour réserver un droit d'émission futur (FNAV(ACK), FNAV(DATA)) de la station d'émission (S2). Cette invention permet ainsi d'améliorer l'efficacité, en particulier en cas de trafic de données isochrone ou quasi-isochrone, et le support de qualité de service.
PCT/EP2005/054845 2004-09-27 2005-09-27 Procede d'acces multiple pour trafic de donnees isochrone ou quasi-isochrone Ceased WO2006035027A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046854A DE102004046854A1 (de) 2004-09-27 2004-09-27 Vielfachzugriffsverfahren für isochronen oder quasi-isochronen Datenverkehr
DE102004046854.0 2004-09-27

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WO2006035027A1 true WO2006035027A1 (fr) 2006-04-06

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WO (1) WO2006035027A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1698109A1 (fr) * 2003-12-22 2006-09-06 Intel Corporation Acces a un canal de reseau local sans fil bidirectionnel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1005189A2 (fr) * 1998-11-23 2000-05-31 Nokia Multimedia Terminals Oy Procédé et système pour réserver la capacité de transmission
WO2004071021A1 (fr) * 2003-02-03 2004-08-19 Sony Corporation Procede, dispositif, et logiciel de communication
WO2004114598A1 (fr) * 2003-06-25 2004-12-29 Philips Intellectual Property & Standards Gmbh Procede de commande d'acces decentralisee a un support dans un reseau de communications

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Publication number Priority date Publication date Assignee Title
US20040071154A1 (en) * 2002-10-08 2004-04-15 Wentink Maarten Menzo Achieving high priority and bandwidth efficiency in a shared communications medium
JP4734227B2 (ja) * 2003-01-09 2011-07-27 トムソン ライセンシング Ｗｌａｎにおける帯域プロビジョニング方法及び装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1005189A2 (fr) * 1998-11-23 2000-05-31 Nokia Multimedia Terminals Oy Procédé et système pour réserver la capacité de transmission
WO2004071021A1 (fr) * 2003-02-03 2004-08-19 Sony Corporation Procede, dispositif, et logiciel de communication
EP1592175A1 (fr) * 2003-02-03 2005-11-02 Sony Corporation Procede, dispositif, et logiciel de communication
WO2004114598A1 (fr) * 2003-06-25 2004-12-29 Philips Intellectual Property & Standards Gmbh Procede de commande d'acces decentralisee a un support dans un reseau de communications

Non-Patent Citations (1)

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Title
HIERTZ G R ET AL: "A decentralized reservation scheme for IEEE 802.11 ad hoc networks", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 2003. PIMRC 2003. 14TH IEEE PROCEEDINGS ON SEPT. 7-10, 2003, PISCATAWAY, NJ, USA,IEEE, vol. 2, 7 September 2003 (2003-09-07), pages 2576 - 2580, XP010678097, ISBN: 0-7803-7822-9 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1698109A1 (fr) * 2003-12-22 2006-09-06 Intel Corporation Acces a un canal de reseau local sans fil bidirectionnel

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