WO2009127734A1 - Appareil de réseau et son procédé de commande - Google Patents

Appareil de réseau et son procédé de commande Download PDF

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Publication number
WO2009127734A1
WO2009127734A1 PCT/EP2009/054652 EP2009054652W WO2009127734A1 WO 2009127734 A1 WO2009127734 A1 WO 2009127734A1 EP 2009054652 W EP2009054652 W EP 2009054652W WO 2009127734 A1 WO2009127734 A1 WO 2009127734A1
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WO
WIPO (PCT)
Prior art keywords
physical layer
rate
bandwidth
rated
real
Prior art date
Application number
PCT/EP2009/054652
Other languages
English (en)
Inventor
Wen Jing Liang
Junbiao Zhang
Jin Fei Yu
Original Assignee
Thomson Licensing
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 Thomson Licensing filed Critical Thomson Licensing
Publication of WO2009127734A1 publication Critical patent/WO2009127734A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/4013—Management of data rate on the bus
    • H04L12/40136—Nodes adapting their rate to the physical link properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates generally to the network technology, and more particularly, to a network apparatus in a multi-rate shared medium network and controlling method therefore.
  • a plurality of client premise equipments access to a communication medium with a physical layer (modulation) rate among a plurality of optional rates by a CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol.
  • CPEs client premise equipments
  • CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
  • the physical layer rate of a CPE in the network may drop to a lower level due to some reasons, such as faults in communication lines and hardware.
  • the fault CPE since the opportunities of access to the shared medium will remain unchanged under the principle of equity, the fault CPE will increase its bus time occupation ratio. This will lead to a decrease of the bus time occupation ratio and in turn the application layer bandwidth of other CPEs. As a result, the operation and QoS of the whole network are impacted.
  • An object of the invention is to provide a network apparatus in a multi- rate shared medium network and controlling method therefore.
  • the shared medium is controlled and managed as a communication resource to prevent one or some faulty apparatus from negatively influencing the application layer bandwidth of normal ones so that the normal apparatus and the network on the whole can work properly under such a condition.
  • a method for controlling an apparatus in a multi-rate shared medium network accesses the shared medium using a contention based shared medium access protocol, wherein said apparatus is able to use a plurality of physical layer rates over the shared access medium.
  • One of the plurality of physical layer rates is set as the rated physical layer rate of the apparatus corresponding to a rated application layer bandwidth.
  • the method comprises the steps of determining the real physical layer rate of the apparatus; and upon detection of the real physical layer rate being lower than the rated physical layer rate, adjusting the real application layer bandwidth of the apparatus to be lower than the rated application layer bandwidth.
  • an apparatus in a multi-rate shared medium network which accesses the shared medium using a contention based shared medium access protocol, wherein said apparatus is able to use a plurality of physical layer rates over the shared access medium.
  • One of the plurality of physical layer rates is set as the rated physical layer rate of the apparatus corresponding to a rated application layer bandwidth.
  • the apparatus comprises a detecting unit for detecting the real physical layer rate of the apparatus; and a control unit for receiving a detecting result from the detecting unit, and upon detection the real physical layer rate being lower than the rated physical layer rate, adjusting the real application layer bandwidth of the apparatus to be lower than the rated application layer bandwidth.
  • Figure 1 is a diagram showing a system infrastructure for access to the internet through existing cable TV cable network
  • Figure 2 is a diagram showing the application layer bandwidth of CPEs in a multi-rate bus network
  • Figure 3 is a block diagram showing the structure of a CPE 300 in a multi-rate bus network according to an embodiment of the present invention.
  • Figure 4 is a diagram showing the workflow of a method for controlling a CPE in a multi-rate bus network according to an embodiment of the present invention.
  • FIG. 1 is an exemplary diagram showing a system infrastructure for access to the internet through an existing cable TV cable network.
  • the internet is used in a broad sense and refers to the wide area network, which could be the Internet or the operator's network with walled garden applications.
  • a headend apparatus 10 is provided between the internet and the cable TV network.
  • Said headend apparatus 10 comprises multiple access points 20 (AP1 ...APn).
  • the access points 20 are used to transform the Ethernet network signal received via a switch 12 into RF signal.
  • the RF signals from the multiple access points 20 are combined together with cable TV signal by a splitter 30.
  • the splitter 30 represents a set of power splitters and band splitters.
  • the splitter 30 is connected to a cable 50.
  • the access points 20 in the embodiment provide a data switching function over the DataLink Layer of the OSI (Open System Interconnect) Reference Model.
  • OSI Open System Interconnect
  • each client 40 for example client 2, at the remote client end 100' of the cable TV network, is provided with a splitter 60 for separating RF signal from the analog video signal of cable TV, and transmitting relevant signals to modem 70 and the TV receiver 90 at client 2 respectively.
  • the splitter 60 can be implemented using power splitters and/or band pass filters.
  • the data signal is demodulated by the modem 70 and sent to a PC 80 at client 2.
  • a basic requirement for this coaxial cable network is that the operator should ensure the application layer bandwidth subscribed by the subscribers within a predetermined error range.
  • the bandwidth needs to be managed and properly utilized.
  • the above object is typically achieved by determining a maximum subscriber number of a network according to the bus bandwidth (equal to application layer bandwidth on the bus) and the subscribed bandwidth, the average online ratio at busy time and the average bandwidth occupation ratio at busy time of each subscriber.
  • the maximum subscriber number of the network is derived as follows:
  • the above network planning scheme is applicable since each subscriber can be allocated a subscribed bandwidth by the configuration of network administrator.
  • this scheme will have problems when it is used in a multi-rate shared medium access network.
  • This problem mainly arises from the fact that a CPE in a multi-rate bus access network can operate in one of a plurality of optional physical layer rates. If related conditions, such as of communication lines or hardware, of a CPE deteriorates, the CPE will be not suitable for operation in a rated physical layer rate (in most cases, the maximum rate among all the options) and have to reduce its rate to a lower level. However, since all the CPEs have the same opportunity to access to the bus under the principle of equity in the CSMA/CA protocol, the above described CPE will have a larger bus time occupation ratio. When the physical layer rate of this fault CPE drops to some extent, it will occupy the bus time of the other normal CPEs. Therefore, the application layer bandwidth of the normal CPEs will not be available and the quality of service ('QoS') will be impacted.
  • 'QoS' quality of service
  • Figure 2 is a diagram showing the application layer bandwidth of CPEs in a multi-rate bus network.
  • Figure 2a shows a normal case in which two CPEs use a rated physical layer rate of 54Mbps to access to the bus.
  • Figure 1 a suppose that the two CPEs both send out four frames under the principle of equity, they occupy the same bus time and each frame carries same number of data, then two CPEs gets same application layer bandwidth.
  • Figure 2b the upper CPE operates in a physical layer rate of 18Mbps, as a result its frame length extends to three times of the initial one but carries the same number of data.
  • an access point can associate with 25 CPEs, each of which is capable of operating with one of multiple physical layer rates such as
  • each CPE will use the 54Mbps rate, called the rated physical layer rate, to access to the network.
  • the application layer throughput of the network is 25Mbit/s and each CPE will have 1 Mbit/s uplink application layer bandwidth.
  • a packet loss rate under 0.1 % will meet the operational requirement, in which case we consider the network works normally. But if the packet loss rate increases, for example to 5%, a drop of the physical layer rate will be triggered.
  • the physical layer rate of this CPE will be reduced from 54Mbps to 6 Mbps.
  • the CPE still has an uplink application layer bandwidth of 1 Mbit/s, it will occupy 1/3 of the bus time in view of the facts that practically a physical layer rate of 6 Mbps can support an application layer bandwidth of about 3Mbit/s.
  • the other 24 normal CPEs can only have about 2/3 of their subscribed bus time. Thus it can be seen that one faulty CPE impacts the operation of all the other normal CPEs.
  • both CPEs operate with the rated physical layer rate of 54Mbps.
  • each of the CPEs is allocated an application layer bandwidth of 15Mbit/s, then they respectively have a bus time occupation ratio of 1/2.
  • the condition of the communication line between the CPE1 and the access point deteriorates to result in a reduction of its physical layer rate to 1 Mbps while the physical layer rate of CPE2 is not changed.
  • the opportunity of CPE1 to access to the bus is the same as that of the CPE2.
  • CPE1 and CPE2 will transmit the same number of frames.
  • an embodiment of the present invention proposes a solution to manage and control the bus in a multi-rate bus network to prevent at least one faulty CPE from occupying bus time of other CPEs so that the normal operation of the bus and the network can be ensured.
  • the application layer bandwidth of a CPE in the network is adjusted according to its physical layer rate in order that the CPE will operate with lower application layer bandwidth in case of lower physical layer rate and operate with an extremely low application layer bandwidth or just keep management channels in case of minimum physical layer rate. Therefore, the faulty CPE will not impact the operation of other normal CPEs and the bus.
  • Figure 2c shows a bandwidth reallocation when one embodiment of the invention works.
  • the upper CPE whose physical layer rate drops from 54Mbps to 18Mbps reduces its application layer bandwidth, by which the bus time occupation ratio of this CPE is reduced.
  • the lower CPE can still have the bus time occupation ratio of 1/2. As a result, lower CPE remains its subscribed application layer bandwidth.
  • the application layer bandwidth of a faulty CPE is controlled to reduce in proportion to the reduction of the physical layer rate in order to prevent the bus time of other normal CPEs from being occupied.
  • FIG. 3 is a block diagram showing the structure of a CPE 300 in a multi-rate bus network according to an embodiment of the present invention.
  • the CPE 300 accesses to the network with one of a plurality of optional physical layer rates according to the CSMA/CA protocol.
  • One of the plurality of physical layer rates is set as the rated physical layer rate of the CPE 300, under which condition the CPE 300 has a rated application layer bandwidth.
  • the CPE 300 comprises a detecting unit 301 for detecting the real physical layer rate of the CPE 300.
  • the CPE 300 also comprises a control unit 302 for receiving the detecting result from the detecting unit 301. If the detected result shows that the real physical layer rate is lower than the rated physical layer rate of the CPE 300, the control unit 302 will adjust the real application layer bandwidth of the CPE 300 to be lower than the rated application layer bandwidth.
  • FIG 4 is a flow chart showing the procedure 400 carried out by the CPE 300 according to an embodiment of the present invention.
  • the real physical layer rate of the CPE 300 is detected.
  • the procedure goes to the step 403 in which the detected real physical layer rate is compared with the rated physical layer rate of the CPE 300. If the real physical layer rate is larger than or equal to the rated physical layer rate, the procedure goes to step 401. Otherwise (the real physical layer rate is lower than the rated physical layer rate), the procedure goes to the step 405 in which the real application layer bandwidth of the CPE is adjusted to be lower than its rated application layer bandwidth.
  • an adjustment factor can be introduced to adjust the application layer bandwidth of the CPE 400.
  • the control unit 302 will reduce the application layer bandwidth upon detection of the real physical layer rate being lower than the rated one. If the CPE 300 is in the state of reception, the control unit 302 will send a message to the transmitter (access point in the case), asking for the transmitter to reduce the application layer bandwidth upon detection of the real physical layer rate being lower than the rated one.
  • the initial physical layer rates of the CPE1 and CPE2 with the access point are both 54Mbps, which corresponds to a total application layer bandwidth of about 25Mbit/s. If both the CPE1 and CPE2 are allocated an uplink bandwidth of 10Mbit/s, the total bus occupation ratio is about 80%, with CPE1 and CPE2 having about 40% respectively.
  • the condition of the bus changes for some reasons. That is, the channel between the access point and CPE2 remains normal while the channel between the access point and the CPE1 deteriorates to result in a reduction of the physical layer rate into 18Mbps.
  • the application layer bandwidth of CPE1 should be reduced to prevent the CPE1 from occupying the bus time of CPE2 according to an embodiment of the present invention.
  • the real application layer bandwidth of CPE1 is reduced to be 10 x (18/54) M bit/s.
  • the application layer bandwidth of the normal CPE2 suspends and is not impacted by the faulty CPE1.
  • the preset retransmission times of the network should also be considered for the application layer bandwidth adjustment of CPE1 to keep the CPE1 to operate in an extremely low rate. That is, when the sender does not receive the ACK from receiver, it will resend at maximum for the preset number of times. If the frame is not received correctly after N trials, then the frame is dropped.
  • the real retransmission times of the network do not change over different physical layer rates. In this case, only the physical layer rate needs to be considered in view of the application layer bandwidth adjustment. However, when the CPE1 operates in a minimum physical layer rate of the network, the preset retransmission times of the network should also be considered as well as the physical layer rate. The reason for this lies in the fact that in this case the real retransmission times of CPE1 can not be reduced by the reduction of the physical layer rate so that the real retransmission times of CPE1 is larger than that of CPE2. In this extreme case, retransmission times of each packet of CPE1 are likely to be the preset retransmission times of the network which therefore should be considered in the application layer bandwidth adjustment of CPE1.
  • the real application layer bandwidth of CPE1 is reduced to be 10 x (18/54)/3 M bit/s.
  • the application layer bandwidth of CPE1 will not be impacted by the fault CPE1.
  • the application layer bandwidth adjustment factor A can be set as 0, in which case only management channel was maintained for CPE1 and the application layer bandwidth will be recovered after the fault removal.
  • an embodiment of the present invention proposes an apparatus in a multi-rate shared medium network with and controlling method therefore which adjust the real application layer bandwidth upon reduction of the physical layer rate of the apparatus to prevent bus time of other normal apparatus in the network from being occupied.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention porte sur un appareil de réseau dans un réseau à support partagé multidébit et sur son procédé de commande. L'appareil accède au support partagé en utilisant un protocole d'accès au support partagé à base de conflit, ledit appareil est capable d'utiliser une pluralité de débits de couche physique sur le support d'accès partagé. L'un de la pluralité de débits de couche physique est défini en tant que débit de couche physique nominale de l'appareil correspondant à une bande passante de couche d'application nominale. Le procédé comprend les étapes consistant à déterminer le débit de couche physique réelle de l'appareil ; et lorsqu'il est détecté que le débit de couche physique réelle est inférieur au débit de couche physique nominale, ajuster la bande passante de couche d'application réelle de l'appareil pour qu'elle soit inférieure à la bande passante de couche d'application nominale. Selon l'invention, le support partagé est commandé et géré en tant que ressource de communication afin d'empêcher un ou plusieurs équipements de locaux d'abonnés (CPE) défectueux d'influencer défavorablement la bande passante de couche d'application de CPE normaux, de sorte que les CPE normaux et le réseau peuvent dans l'ensemble fonctionner correctement dans une telle condition.
PCT/EP2009/054652 2008-04-18 2009-04-20 Appareil de réseau et son procédé de commande WO2009127734A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08290383.2 2008-04-18
EP08290383 2008-04-18

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WO2009127734A1 true WO2009127734A1 (fr) 2009-10-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102163994A (zh) * 2011-04-20 2011-08-24 杭州再灵电子科技有限公司 基于tr-069协议的电力载波调制解调器
CN104125038A (zh) * 2013-04-25 2014-10-29 华为技术有限公司 一种调整信道质量指示的方法及设备
WO2020093502A1 (fr) * 2018-11-07 2020-05-14 网宿科技股份有限公司 Procédé et dispositif d'ajustement de largeur de bande nominale

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5815502A (en) * 1993-04-13 1998-09-29 Hitachi, Ltd. Information transmission system with variable transmission rate
GB2337672A (en) * 1998-05-20 1999-11-24 3Com Technologies Ltd Reducing the data rate when idle state symbol errors exceed a threshold
US6529957B1 (en) * 1998-08-25 2003-03-04 Intel Corporation Method for increasing performance on a dedicated multi-speed Ethernet link segment
US20050094607A1 (en) * 2003-10-31 2005-05-05 Interdigital Technology Corporation Adaptive radio resource management for wireless local area networks
WO2007135919A1 (fr) * 2006-05-19 2007-11-29 Panasonic Corporation dispositif de transmission, procÉdÉ de transmission, LSI de systÈme et programme
US20070280181A1 (en) * 2006-05-30 2007-12-06 Ryoko Matsuo Wireless communication apparatus and transmission control method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5815502A (en) * 1993-04-13 1998-09-29 Hitachi, Ltd. Information transmission system with variable transmission rate
GB2337672A (en) * 1998-05-20 1999-11-24 3Com Technologies Ltd Reducing the data rate when idle state symbol errors exceed a threshold
US6529957B1 (en) * 1998-08-25 2003-03-04 Intel Corporation Method for increasing performance on a dedicated multi-speed Ethernet link segment
US20050094607A1 (en) * 2003-10-31 2005-05-05 Interdigital Technology Corporation Adaptive radio resource management for wireless local area networks
WO2007135919A1 (fr) * 2006-05-19 2007-11-29 Panasonic Corporation dispositif de transmission, procÉdÉ de transmission, LSI de systÈme et programme
EP2023575A1 (fr) * 2006-05-19 2009-02-11 Panasonic Corporation Dispositif de transmission, procede de transmission, lsi de systeme et programme
US20070280181A1 (en) * 2006-05-30 2007-12-06 Ryoko Matsuo Wireless communication apparatus and transmission control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102163994A (zh) * 2011-04-20 2011-08-24 杭州再灵电子科技有限公司 基于tr-069协议的电力载波调制解调器
CN104125038A (zh) * 2013-04-25 2014-10-29 华为技术有限公司 一种调整信道质量指示的方法及设备
CN104125038B (zh) * 2013-04-25 2018-10-19 华为技术有限公司 一种调整信道质量指示的方法及设备
WO2020093502A1 (fr) * 2018-11-07 2020-05-14 网宿科技股份有限公司 Procédé et dispositif d'ajustement de largeur de bande nominale

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