WO2008055438A1 - Procédé et dispositif d'allocation de bande passante pour réseau optique passif dans lequel coexistent des vitesses de transmission différentes - Google Patents

Procédé et dispositif d'allocation de bande passante pour réseau optique passif dans lequel coexistent des vitesses de transmission différentes Download PDF

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Publication number
WO2008055438A1
WO2008055438A1 PCT/CN2007/070992 CN2007070992W WO2008055438A1 WO 2008055438 A1 WO2008055438 A1 WO 2008055438A1 CN 2007070992 W CN2007070992 W CN 2007070992W WO 2008055438 A1 WO2008055438 A1 WO 2008055438A1
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WO
WIPO (PCT)
Prior art keywords
onu
rate
transmission rate
bandwidth allocation
discovery
Prior art date
Application number
PCT/CN2007/070992
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English (en)
Chinese (zh)
Inventor
Yuntao Wang
Wei Huang
Peng Ou
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to JP2009535551A priority Critical patent/JP4891410B2/ja
Publication of WO2008055438A1 publication Critical patent/WO2008055438A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers

Definitions

  • the present invention relates to the field of communications, and more particularly to a bandwidth allocation method and apparatus for coexistence of PONs of different transmission rates.
  • the passive optical network accesses signals from the optical network line terminal (OLT). Assigned to each client through the Optical Distribution Network (ODN) (ONU/
  • ONT is the optical network user terminal, directly located at the user end; and the ONU is the optical network subscriber unit, and other networks such as Ethernet between the users, and the multimedia signal can be viewed at the user end.
  • the OLT is located at the central office, the ONU/ONT is located at the user end, and the direction of the OLT to the ONU/ONT is the downlink direction, and vice versa.
  • Bian downstream direction 1 min 16, 1 min 32 min 1 64 or the like based on a multicast distribution scheme inches division multiplexed optical signal input from the ODN will be assigned by the OLT average output power to a number of clients, generally
  • the transmission rate of PON will reach 10OGbps, so the bandwidth of each user will increase by 10 times to 300Mbps.
  • Figure 2 is the optimal coexistence scheme obtained by combining various factors. Downstream lOGbps
  • the ONU uses 1550 wavelengths, and the lGbps ONU still uses 1490 wavelengths, and the uplink shares a 1310 wavelength.
  • PONs have different transmission rates.
  • ONU ⁇ for example, lOGbps and lGbps ONU, share an upstream wavelength according to the related technical solutions. Therefore, the OLT needs to perform unified scheduling on the daytime, and needs to find a most efficient bandwidth allocation method.
  • the embodiments of the present invention are directed to a bandwidth allocation method and apparatus for coexistence of different transmission rate PONs, so as to solve the problem that the related technologies have different transmission rates, PON coexistence, and the OLT needs to perform unified scheduling on the inter-time.
  • An embodiment of the present invention provides a bandwidth allocation method for coexistence of PONs with different transmission rates, including:
  • the OLT performs unified gap allocation on different transmission rate ONUs according to the foregoing entries to form an uplink bandwidth allocation entry;
  • bandwidth allocation commands of different transmission rate ONUs are respectively carried on corresponding downlink optical channels of different wavelengths.
  • An embodiment of the present invention provides a bandwidth allocation apparatus for coexistence of PONs with different transmission rates, including: [19] a category entry setting module, configured to set a category entry to record types of ONUs with different transmission rates; a gap allocation module, configured to perform uniform gap allocation on different transmission rate ONUs according to the foregoing entry, to form an uplink bandwidth allocation entry;
  • the bandwidth allocation module is configured to carry the bandwidth allocation commands of different transmission rates ONUs to the corresponding downlink optical channels of different wavelengths according to the uplink bandwidth allocation entry.
  • An embodiment of the present invention provides a method for determining an ONU downlink rate, including:
  • the discovery message sent to the specific downlink rate ONU is sent through the corresponding wavelength; [24] a dedicated discovery window for the ONU of the specific downlink rate is registered in the discovery window. ON U is determined to be an ONU having the specific downlink rate.
  • An embodiment of the present invention provides an apparatus for determining an ONU downlink rate, including:
  • the discovery packet sending module is configured to send the discovery message sent to the specific downlink rate ONU through the corresponding wavelength during the discovery process;
  • the ONU downlink rate determining module is configured to set up a special discovery window for the ONU of the specific downlink rate, and determine an ONU registered in the discovery window as an ONU having the specific downlink rate.
  • An embodiment of the present invention provides a method for determining a discovery window to which a different rate ONU belongs, including:
  • the protocol packet corresponding to the discovery window is received from the ONU, where the protocol packet includes the identifier information, where the identifier information indicates a correspondence between the discovery window and the downlink rate.
  • An embodiment of the present invention provides an apparatus for determining a discovery window to which an ONU belongs to a different rate, including:
  • the receiving module is configured to receive, according to the discovery process, a protocol packet corresponding to the discovery window, where the protocol packet includes the identifier information, where the identifier information indicates a correspondence between the discovery window and the downlink rate.
  • the determining module determines, according to the downlink rate of the ONU and the identifier information, a discovery window to which the ONU belongs.
  • the embodiment of the present invention uses the OLT to manage the classification information of the ONU, and performs uniform gap allocation according to the classification information, thereby realizing the most efficient bandwidth allocation.
  • the embodiment of the present invention achieves the following technical effects:
  • FIG. 1 is a schematic structural diagram of a PON network system according to the prior art
  • FIG. 2 is a schematic diagram of a PON network in which a lOGbps and a lGbps ONU coexist according to the prior art
  • FIG. 3 is a flow chart showing a method of determining an ONU downlink rate according to an embodiment of the present invention
  • FIG. 4 shows a block diagram of a device for determining an ONU downlink rate according to an embodiment of the present invention
  • FIG. 5 is a flow chart showing a bandwidth allocation method for coexistence of different transmission rate PONs according to an embodiment of the present invention
  • FIG. 6 shows a block diagram of a bandwidth allocation apparatus for coexistence of different transmission rate PONs according to an embodiment of the present invention
  • Figure 7 is a schematic diagram showing the switching between the lGbps and lOGbps transmission rate lasers, respectively, in accordance with one embodiment of the present invention.
  • Figure 8 is a diagram showing a comparison of the protection between messages between lGbps and lOGbps transmission rates in accordance with one embodiment of the present invention.
  • FIG. 9 shows a schematic diagram of a comparison between different bandwidth allocation efficiencies according to an embodiment of the present invention.
  • FIG. 10 shows a flow chart of a method for determining a discovery window to which a different rate ONU belongs according to the present invention.
  • Figure 11 shows a block diagram of an apparatus for determining discovery windows to which different rate ONUs belong, in accordance with the present invention.
  • the embodiments of the present invention propose that, due to different downlink rates, ONUs such as lOGbps ONUs and lGbpss
  • the ONU uses different downstream wavelengths.
  • An embodiment of the present invention provides a method for determining an ONU downlink rate, including the following steps:
  • Step S302 During the discovery process, the discovery packet sent to the specific downlink rate ONU is sent through the corresponding wavelength.
  • Step S304 setting a special discovery window for the ONU of the specific downlink rate, and determining an ONU registered in the discovery window as an ONU having the specific downlink rate.
  • the discovery message of the lOGbps ONU passes the corresponding wavelength such as 1550nm.
  • Wavelength is sent to lOGbps ONU, and one is designed for lOGbps
  • the discovery window of the ONU is set up, so as long as the ONUs registered in this discovery window are lOGbps ONUo, the discovery messages of the same lGbps ONU are sent to the lGbps through the corresponding wavelengths such as 1490nm wavelength. ONU, and open a dedicated for lGbps
  • the discovery window started by ONU, as long as the ONU registered in this discovery window is lGbps ONU.
  • FIG. 4 shows an apparatus 400 for obtaining an ONU downlink rate according to an embodiment of the present invention, which includes:
  • the discovery packet sending module 402 is configured to send the discovery packet sent to the specific downlink rate ONU through the corresponding wavelength during the discovery process;
  • the ONU downlink rate determining module 404 is configured to set up a special discovery window for the ONU of the specific downlink rate, and determine an ONU registered in the discovery window as an ONU having the specific downlink rate.
  • the specific downlink rate includes 10 Gbps or 1 Gbps.
  • the specific downlink rate is 10 Gbps, and the discovery module 402 is further configured to send the discovery packet to the 1550 nm wavelength.
  • the discovery module 402 is further configured to send the discovery packet through a wavelength of 1490 ⁇ m.
  • ONUs such as lOGbps ONU and lGbps
  • the ONU uses the same upstream wavelength, and can set up a dual-mode or multi-mode receiver to identify the uplink rate of the ONU.
  • FIG. 5 illustrates a bandwidth allocation method for coexistence of different transmission rate PONs according to an embodiment of the present invention, which includes the following steps:
  • Step S502 setting a category entry in the OLT, for recording the type of the ONU of different transmission rates, and identifying the uplink transmission rate and the downlink transmission rate of the ONU according to the type;
  • Step S504 The OLT performs unified gap allocation on different transmission rate ONUs according to the foregoing entry to form an uplink bandwidth allocation entry;
  • Step S506 according to the uplink bandwidth allocation entry, respectively, the bandwidth allocation instructions of different transmission rates are respectively carried on the downlink optical channels of different wavelengths.
  • the data sent to different downlink rate ONUs can also be placed at the wavelength corresponding to the downlink rate.
  • the different transmission rates ONU include a high transmission rate ONU and a low transmission rate ONU
  • the category entries set in the OLT include two categories, a high transmission rate and a low transmission rate.
  • Step S504 may include dividing the ONU into two groups according to different transmission rates, so that the high transmission rate ONU uplink buffers are adjacent, so that the low transmission rate ONU uplink gaps are adjacent.
  • the high transmission rate ONU is 10 Gbps ONU
  • the low transmission rate ONU is 1 Gbps ONU.
  • Step S504 includes the following steps: The bandwidth allocation instruction of the ONU of the 10 Gbps is sent to the ONU of the corresponding wavelength, such as the wavelength of 1 550 nm, to the ONU of the 10 Gbps, and the bandwidth allocation instruction of the ONU of the I Gbps is sent to the corresponding wavelength, such as the wavelength of 1490 nm, and sent to the IGbps. ONU.
  • FIG. 6 illustrates a bandwidth allocation apparatus 600 for coexistence of different transmission rate PONs according to an embodiment of the present invention, including:
  • the category entry setting module 602 is configured to set a category entry in the OLT to record the type of the ONU of different transmission rates, and according to the type, the uplink transmission rate and the downlink transmission rate of the ONU may be identified;
  • a gap allocation module 604 configured to enable the OLT to perform uniform gap allocation on different transmission rate ONUs according to the foregoing entry, to form an uplink bandwidth allocation entry;
  • the bandwidth allocation module 606 is configured to carry the bandwidth allocation commands of different transmission rates to the downlink optical channels of different wavelengths according to the uplink bandwidth allocation entry.
  • the data sent to different downlink rates ON U can also be placed on the wavelength corresponding to the downlink rate.
  • the different transmission rate ONUs include a high transmission rate ONU and a low transmission rate ONU
  • the category entries set in the OLT include two types, namely a high transmission rate and a low transmission rate.
  • the gap allocation module 604 can be used to divide the ONU into two groups according to the transmission rate, so that the high transmission rate ONU uplink gaps are adjacent, so that the low transmission rate ONU uplink gaps are adjacent.
  • the high transmission rate ONU is 10 Gbps ONU
  • the low transmission rate ONU is 1 Gbps ONU.
  • the gap allocation module 604 can be used to allocate the bandwidth allocation command of the 10U ONU to the ONU of the 1OGbps at the wavelength of 1550 nm, and transmit the bandwidth allocation command of the IU ONU to the 1U Gbps ONU.
  • the present invention utilizes the OLT to manage the classification information of the ONU, and performs uniform gap allocation according to the classification information, thereby achieving the most efficient bandwidth allocation.
  • the OLT records the classification information of these ONUs in one entry, as shown in Table 1:
  • Figure 7 shows a schematic diagram of the inter-turns of lGbps and lOGbps transmission rate lasers, respectively, in accordance with one embodiment of the present invention.
  • Figure 8 is a diagram showing a comparison of protection between messages between lGbps and lOGbps transmission rates in accordance with one embodiment of the present invention.
  • Figure 9 shows a schematic diagram comparing the different bandwidth allocation efficiencies in accordance with one embodiment of the present invention.
  • the uplink packets are grouped into one group.
  • the uplink packets of IGbps are grouped into one group, which can greatly improve the allocation efficiency of the uplink bandwidth.
  • the OLT transmits the bandwidth allocation command of the ONU of the lOGbps to the ONU of the lOGbps at the wavelength of 1550 nm.
  • the bandwidth allocation command of the IGbps ONU is placed on the 1490nm wavelength and sent to the IGbps ONU.
  • An embodiment of the present invention further provides a method for determining a discovery window to which an ONU belongs at different rates. As shown in FIG. 10, the processing flow is as follows:
  • Step S1002 Receive a protocol packet corresponding to the discovery window from the ONU, where the protocol packet includes the identifier information, where the identifier information indicates a correspondence between the discovery window and the downlink rate.
  • Step S1004 Determine, according to the downlink rate of the ONU and the identifier information, a discovery window to which the ONU belongs.
  • An embodiment of the present invention further provides an apparatus for determining a discovery window to which an ONU belongs to different rates.
  • the method includes: The receiving module 1102 is configured to receive, according to the discovery process, a protocol packet corresponding to the discovery window from the ONU, where the protocol packet includes the identifier information, where the identifier information indicates a correspondence between the discovery window and the downlink rate.
  • the determining module 1104 is configured to determine, according to the downlink rate of the ONU and the identifier information, a discovery window to which the ONU belongs.
  • the ONU is configured to perform the gap allocation according to the uplink rate of the ONU, and the uplink bandwidth allocation entry is formed, so that the bandwidth allocation efficiency is high.
  • the bandwidth allocation instruction is used.
  • the wavelength corresponding to the downlink rate of the ONU is sent to the ONU, so that the PON coexists at different rates, and the rate is matched with the bandwidth and the wavelength, so that the OLT is uniformly scheduled in the inter-turn, and the bandwidth allocation of the PON coexistence at different rates is formed. solution.
  • the discovery packet sent to the specific downlink rate ONU is sent through the corresponding wavelength; a special discovery window is opened for the ONU of the specific downlink rate, and the subsequent The discovery window is registered, and the downlink rate of the ONU is determined to be the specific downlink rate, so that the downlink rate is obtained conveniently and quickly.
  • the identifier information is used to indicate the corresponding relationship between the discovery window and the downlink rate.
  • the subsequent discovery according to the downlink rate of the ONU and the identifier information, may determine the discovery window to which the ONU belongs.
  • a solution for opening different discovery windows for different rates of ON U is implemented.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé d'allocation de bande passante pour un réseau optique passif dans lequel coexistent des vitesses de transmission différentes. Les éléments de table de catégories d'unités de réseau optique sont établis dans l'OLT avec de vitesses de transmission différentes; l'OLT alloue de manière uniforme les intervalles de temps pour les unités de réseau optique à vitesses de transmission différentes en fonction desdits éléments de table pour générer les éléments de table d'allocation de la bande passante amont; et selon les éléments de table d'allocation de la bande passante amont, les instructions d'allocationde bande passante des unités de réseau optique à vitesses de transmission différentes sont transportées par le canal optique aval avec les différentes longueurs d'onde correspondantes. L'invention concerne également un dispositif d'allocation de bande passante pour un réseau optique dans lequel coexistent des vitesses de transmission différentes d'unités de réseau optique et un procédé et un dispositif pour déterminer le fenêtres de recherche auxquelles appartiennent les unités de réseau optique à vitesses de transmission différentes.
PCT/CN2007/070992 2006-11-09 2007-10-30 Procédé et dispositif d'allocation de bande passante pour réseau optique passif dans lequel coexistent des vitesses de transmission différentes WO2008055438A1 (fr)

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JP2009535551A JP4891410B2 (ja) 2006-11-09 2007-10-30 共に存在する異なる送信レートを有するｐｏｎにおける帯域幅割り当てのための方法およびデバイス

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US9225424B2 (en) 2013-03-29 2015-12-29 Hitachi, Ltd. Dynamic bandwidth allocation method, OLT, and PON system

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US9831948B2 (en) * 2015-09-22 2017-11-28 Exfo Inc. Optical power measurement in a passive optical network
CN109429118B (zh) * 2017-09-04 2022-03-01 中兴通讯股份有限公司 带宽分配方法、装置及系统

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US20110217041A1 (en) * 2009-05-28 2011-09-08 Fujitsu Telecom Networks Limited Pon system, station-side apparatus for pon system, and control method thereof
US8340518B2 (en) * 2009-05-28 2012-12-25 Fujitsu Telecom Networks Limited PON system, station-side apparatus for PON system, and control method thereof
US9225424B2 (en) 2013-03-29 2015-12-29 Hitachi, Ltd. Dynamic bandwidth allocation method, OLT, and PON system

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JP4891410B2 (ja) 2012-03-07
CN102325083A (zh) 2012-01-18
JP2010509812A (ja) 2010-03-25
CN102325083B (zh) 2014-11-05

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