EP2067293A1 - Procédé de transmission de données dans un réseau de communications - Google Patents

Procédé de transmission de données dans un réseau de communications

Info

Publication number
EP2067293A1
EP2067293A1 EP07820384A EP07820384A EP2067293A1 EP 2067293 A1 EP2067293 A1 EP 2067293A1 EP 07820384 A EP07820384 A EP 07820384A EP 07820384 A EP07820384 A EP 07820384A EP 2067293 A1 EP2067293 A1 EP 2067293A1
Authority
EP
European Patent Office
Prior art keywords
data
data transmission
traffic
communication network
rate
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Withdrawn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
EP07820384A
Other languages
German (de)
English (en)
Inventor
Alejandro Ramirez
Michael Finkenzeller
Christian SCHWINGENSCHLÖGL
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP2067293A1 publication Critical patent/EP2067293A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate

Definitions

  • the invention is in the technical field of communica tion ⁇ networks and relates to a method for transmitting data in a communication network.
  • the quality of service is expressed, for example, in jitter (deviation of the latency from its mean value), latency (delay of the end-to-end transmission), loss rate (probability that individual data packets are lost) and throughput (amount of data transmitted per unit of time) , While promised quality of service is not always required, it is essential for a particular type of traffic, such as the transmission of real-time data.
  • wireless communication networks Due to the susceptibility to errors, the quality of service in wireless communication networks is particularly important.
  • the popularity of wireless communication networks has increased significantly in recent years, for example, by wirelessly connecting portable computers to the Internet, with IEEE 802.11 wireless LANs (WLANs) being among the most widely used wireless technologies.
  • WLANs IEEE 802.11 wireless LANs
  • OFDM Orthogonal Frequency Division Multiplexing
  • bit error rate is the bit error rate (BER), ie the number of errors per unit of time.
  • BER bit error rate
  • each chip manufacturer generally uses its own maximum bit error rate, which is to be undershot .
  • SNR signal-to-noise ratio
  • BER Bitfeh ⁇ lerrate
  • HC Hyb ⁇ rid Coordinator
  • HCF Hybrid Coordinator Function
  • EDCF Enhanced Distributed Coordination Function
  • HCCA controlled channel access
  • AC Access Category
  • TS Traffic Stream
  • Input apt framework will see ⁇ with a Traffic Priority (TID) ver. This can take values between 0 and 15.
  • TXOP Transmission Opportunity
  • EDCF-TXOP a time interval in which a station is allowed to send.
  • the transmission facility is referred to as EDCF-TXOP if it was obtained in an EDCF competitive phase, or as polled TXOP if it was obtained through a QoS poll frame of a QoS-enhanced AP (QAP).
  • QAP QoS-enhanced AP
  • the maximum duration of a TXOP will be true ⁇ through the set by the QAP value TXOP limit.
  • the extended standard IEEE 802. He removes the restriction that stations in infrastructure mode can not communicate directly with each other. With IEEE 802. he stations no longer have to communicate via the access point (AP), but can directly (only) exchange traffic-specific data via the Direct Link Protocol (DLP). The access point can reject the communications ⁇ request. This measure greatly increases the available bandwidth.
  • DLP Direct Link Protocol
  • the sending station first sends a direct link request message via the AP to the receiving station, in which the supported data rates and other information are transmitted. Once the receiver has confirmed these parameters, the direct link between the two stations is established. Subsequently, data can be exchanged directly between sender and receiver. If no more data is transmitted, the Direct Link is disconnected by a timeout after a certain time. Thereafter, data is again transmitted via the AP.
  • block ACKs block acknowledgments
  • IEEE 802.11 WLANs use a simple stop-and-wait ACK. Through this procedural reindeer but a large overhead due to the i ⁇ gen confirmation is created by acknowledgment (ACK).
  • ACK acknowledgment
  • the IEEE 802.11b enhanced standard is designed to prevent low-priority traffic from interfering with higher-priority traffic.
  • a change in the transmission speed in the physical layer (PHY) is not provided here.
  • the present invention has the object to provide a method for data transmission in a communication network, with which an adjustment of the quality of service in the transmission channel to changed transmission conditions in the transmission channel or to the type of ver ⁇ traffic can take place.
  • a method for data transmission in a communication network is shown with a data transmission channel which connects data via a network node and is controlled by a network management (control device).
  • the network management Network Manage ment ⁇ device or control device
  • the network management may be a centralized or decentralized, in particular distributed in the network node network Manage ment ⁇ .
  • a minimum data transfer rate is determined by the Netzma ⁇ management for the purpose of data transmission in a data transmission channel, which is a resultant from a time assignment of the data transmission channel with traffic minimum required data transfer rate.
  • the data transmission rates available for data transmission in a transmission channel may in particular be data transmission rates fixed by a standard such as 802. He or proprietary data transmission rates used by a chip manufacturer.
  • the target data transmission rate resulting from the temporal assignment of the transmission channel ensures that the data transmission rate meets the requirements of the user.
  • the minimum target data transmission rate is thus a data Transmission rate which allows a transmission of the intended data traffic within a Zeitrah ⁇ mens provided for this purpose with an optimal bit error rate.
  • a supported by the network Manage ment ⁇ data transmission rate is selected for data transmission, which leads to a minimum bit error rate in data transmission. This is particularly important if only real-time data is to be transmitted via the data transmission channel.
  • a supported by the network management data transfer rate from ⁇ dependence of the type of data to be transmitted traffic is for data transmission ge ⁇ selected. If, for example, only real-time data is to be transmitted via the transmission channel, it is advantageous if a data transmission rate is selected for the data transmission, which results in a minimum bit error rate in the data transmission. To be transmitted simultaneously with the real-time data of other, less QoS-sensitive traffic over a transmission channel, it may be appropriate to allow a greater bit error rate than the minimum bit error rate, so as to provide sufficient time for the transfer ⁇ transmission of other traffic available ,
  • the method according to the invention can be applied particularly advantageously to the data transmission of a wireless communication network.
  • Such wireless Kirunikationsnet ⁇ zes may in particular be based on the IEEE 802. He.
  • a UEtra ⁇ transmission rate is selected as a function of parameters of the traffic Specifi- cation (TSPEC) element, if in the TSEC- element data are included.
  • TSPEC traffic Specifi- cation
  • a UEtra ⁇ transmission rate as a function of measurable parameters of the data traffic can be selected.
  • the pre ⁇ lie is higher layers of the communi ⁇ nikationsnetzes the type of traffic detected by time-sensitive real-time data. Alternatively, this can be done via a so-called fingerprint detection, such as the recognition of frame size and / or time period of Pa ⁇ keterzeugung, or the detection of the port on which an IP connection exists.
  • the invention further extends to a suitable for data processing, electronic, central or decentralized ⁇ network management (network management device or control device) for controlling the data transmission of a communication network, which is provided with a program code containing control commands, the network management for by ⁇ cause a procedure as described above.
  • network management device or control device network management device or control device
  • the invention extends to a network node of a communication network, which is part of a decentralized network management for controlling the data transmission of a communication network, which is provided with a program code containing control commands, which cause the network management to carry out a method as described above.
  • the invention extends to a machine-readable program code (computer program) of a suitable data processing network management for controlling the data transmission of a communication network, which control commands includes, for causing the network management to perform ei ⁇ nes method as described above.
  • the invention extends to a storage medium (computer program product) having a machine-readable program code stored thereon as described above.
  • a storage medium computer program product
  • the invention will now be explained nä ⁇ forth in the form of an embodiment, reference being genome ⁇ men to the accompanying figure. 2
  • Fig. 1 a via the signal-to-noise ratio (SNR) shows an example of applied bit error rate (BER) in depen ⁇ dependence of the data transfer rate (Mbps) of a wireless communication network;
  • Fig. 2 shows the structure of a Traffic Specification format Ele ⁇ management of the WLAN standard IEEE 802. He.
  • data transmission takes place in a wireless communication network based on the extended standard IEEE 802. He.
  • a selection of the data transfer rate is performed such that a data transmission takes place with a ⁇ resulting from a temporal assignment of the data transmission channel minimum Sollarianübertra ⁇ transmission rate.
  • a choice of the data transmission rate depends on the type of data traffic.
  • TSPEC Traffic Specification Element Format
  • Fig. 2 shows the structure of the TSPEC format. Accordingly, the information fields are "Element ID” 1, “Length” 2, “TS Info” 3, "Nominal MSDU Size” 4, “Maximum MSDU Size” 5, “Minimum Service Interval” 6, “Maximum Service Interval” 7 , Inactivity Interval 8, Suspension Interval 9, Service Start Time 10, Minimum Data Rate 11, Mean Data Rate 12, Peak Data Rate 13, Burst Size 14, Delay Bound “15,” minimum PHY Rate “16,” Surplus Bandwidth Allowance “17 and” Medium Time “provided 18th
  • the information field may in particular” are minimum PHY rate "16 to select the data transfer rate ge ⁇ uses in which a minimum data transfer rate in the physical layer (PHY) is specified.
  • the algorithm can for determining the data transmission rate on the transmission channel on measurable Pa ⁇ rametern of data traffic, such as bit rate, data packets / second, bit error rate, the distance between nodes, and / or the Informa ⁇ tion fields of the TSPEC element, if in the information ⁇ fields TSPEC element data are based.
  • measurable Pa ⁇ rametern of data traffic such as bit rate, data packets / second, bit error rate, the distance between nodes, and / or the Informa ⁇ tion fields of the TSPEC element, if in the information ⁇ fields TSPEC element data are based.
  • the specified in the information field "minimum PHY rate" 16 of the TSPEC element data transmission rate as REMtra ⁇ supply rate for transmission be selected supply channel data via the data transmission, assuming that there exists data in the information field ⁇ sem.
  • the hybrid controller transmission rate a higher data determined at the physical layer, so that there is sufficient time for the transfer of the other traffic ⁇ stream in the data transmission channel is available.
  • the Hybrid Controller is the centralized bandwidth manager that constantly monitors and identifies the best configuration of the communication network for optimal performance. Usually it is located in the access point and is responsible for controlling the access to the transmission medium and informing the clients about the communication parameters used.
  • a determination of the type of traffic can be carried over the height ⁇ ren layers of the communication network (OSI layers 3-7 in the model).
  • the lower layers detect the presence of zeitkriti ⁇ schem real-time traffic, such as through the use of filters or a so-called "fingerprint" - detection as the detection of frame size and / or Zeitpe- Riode a packet generation a connection.
  • the detection of the port on which there is an IP connection can be used for this purpose.
  • Non-time sensitive applications may also benefit from the method of the present invention because a low bit error rate means less packet loss, which under certain circumstances may result in higher throughput compared to a higher data rate.
  • a table is required to keep track of the data transfer rate chosen for each link on the physical layer.
  • Such a table can be updated permanently or periodically.
  • One possibility is to convert the variable with respect to the current data transfer rate of the physical layer "current PHY rate", which is already present in all WLAN cards, into a field that uses the Traffic ID field (TID) as an index can use each traffic flow for each of the 'cur ⁇ rent PHY rates "accordingly.
  • TID Traffic ID field
  • Another possibility is to implement a separate table in the firmware containing this information.
  • Another possibility is to use the already existing table, the TSPECs being kept for storing this information. Since the "current PHY rate "for each traffic flow is dynamically adapted to the current conditions of the wireless transmission channel, the possibility of updating this value, if neces ⁇ sary be given.

Landscapes

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

Abstract

L'invention concerne un procédé de transmission de données dans un réseau de communications, comprenant une transmission, commandée par la gestion du réseau, de données par l'intermédiaire d'un canal de transmission de données qui est relié à des noeuds de réseau. Selon ledit procédé, les données prévues sont transmises à un débit de transmission minimum qui résulte d'une utilisation temporelle du canal de transmission de données.
EP07820384A 2006-09-26 2007-09-20 Procédé de transmission de données dans un réseau de communications Withdrawn EP2067293A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006045298A DE102006045298A1 (de) 2006-09-26 2006-09-26 Verfahren zur Datenübertragung in einem Kommunikationsnetz
PCT/EP2007/059941 WO2008037646A1 (fr) 2006-09-26 2007-09-20 Procédé de transmission de données dans un réseau de communications

Publications (1)

Publication Number Publication Date
EP2067293A1 true EP2067293A1 (fr) 2009-06-10

Family

ID=38943797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07820384A Withdrawn EP2067293A1 (fr) 2006-09-26 2007-09-20 Procédé de transmission de données dans un réseau de communications

Country Status (4)

Country Link
US (1) US20100030912A1 (fr)
EP (1) EP2067293A1 (fr)
DE (1) DE102006045298A1 (fr)
WO (1) WO2008037646A1 (fr)

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WO2022039664A1 (fr) 2020-08-18 2022-02-24 Razer (Asia-Pacific) Pte. Ltd. Système et procédé pour commander un pointeur sur un écran d'un dispositif électronique

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Also Published As

Publication number Publication date
WO2008037646A1 (fr) 2008-04-03
US20100030912A1 (en) 2010-02-04
DE102006045298A1 (de) 2008-03-27

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