CN101325460A - Method for processing downstream broadcast and great-extension business of GPON system - Google Patents
Method for processing downstream broadcast and great-extension business of GPON system Download PDFInfo
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Abstract
The invention provides a processing method of the downstream broadcast and the flood operation in a GPON system, comprising: arranging a GEM PORT ID or VPI/VCI for transmitting the broadcasting and the flood operation in the OLT of the GPON system; arranging a GEM PORT ID or VPI/VCI for receiving the broadcast and the flood operation in each corresponding ONT or ONU of OLT, which is the same to the GEM PORT ID or VPI/VCI. When OLT receives the broadcast and the flood pack, which are housed to be brought to the GEM frame or the ATM frame of the GEM PORT ID or VPI/VCI, the GEM frame ot the ATM frame are transmitted to each ONT or ONU on the broadcasting mode through the transmission layer of GPON, and ONT or ONU resolves the GEM frame or the ATM frame according to the self GEM PORT ID. According to the invention, through the characteristics of GPON supporting the broadcast, the processing ability of OLT is advanced, and the downstream bandwidth utilance is increased. The encrypting mode is adopted which advances the safety of the data.
Description
Technical field
The present invention relates to gigabit passive optical network (Gigabit-capable passive opticalnetworks is hereinafter to be referred as GPON) system, the processing method of downlink broadcast, flooded traffic in the particularly a kind of GPON system.
Background technology
The structure of GPON is by optical line terminal (Optical Line Terminal, hereinafter to be referred as OLT), Optical Network Terminal (Optical Network Terminal, hereinafter to be referred as ONT) or optical network unit (Optical Network Unit, hereinafter to be referred as ONU) and the EPON (Passive Optical Network, be called for short PON) of annular (or tree-like) topological structure form.OLT generally is positioned at central machine room, and Wide Area Network interface upwards is provided, and the optical interface of 1.244Gb/s for example or 2.488Gb/s can be provided PON downwards.ONT or ONU be at user side, for the user provides for example 10/100BaseT, and T1/E1, application interfaces such as DS-3, its optical interface speed to PON has multiple choices.From OLT to ONT or the direction of ONU be down direction, adopt the data flow transmission mode of broadcast transmission; Direction from OLN to OLT is a up direction, adopts the time division multiple access access technology based on statistic multiplexing.PON generally adopts tree topology, provides at needs under the situation of service protection and path protection, can add guard ring, provides defencive function to some ONT or ONU
That adopt usually in GPON is GPON method for packing (GPON EncapsulationMethod, hereinafter to be referred as GEM) or asynchronous transfer mode (Asynchronous Transfer Mode, hereinafter to be referred as ATM) encapsulation, a bag enters from the OLT side, go out from ONT or ONU then, at least need through following processing, on OLT, at first need this is sealed in GEM frame of threading or the ATM frame, pass through the Transmission Convergence (TransmissionConvergence of certain processing then at GPON, TC) transmit this GEM frame or ATM frame on the layer, in ONT or ONU side, parse this GEM frame or ATM frame from the TC layer of GPON, check relatively its GEM port-mark (PORT ID) or virtual path VPI (Virtual Path Identifier then, VirtualChannel Identifier, be called for short VPI/VCI), if this GEM PORT ID or this VPI/VCI do not belong to ONT or ONU, then directly abandon this bag.So for broadcasting, bag in the flooded traffic, owing to do not know toward which ONT or ONU to send actually in the OLT side, bag need be sent to all ONT or ONU at OLT, usually set up a plurality of data channel between ONT or ONU and OLT carries out unicast transmission to the way of expecting exactly, each ONT or ONU are adopted an independently clean culture, independent GEM PORT ID or VPI/VCI transmit, but there is following defective in this method, promptly same portion cladding need be made N part in the OLT side, and then on GPON, broadcast, increased realization difficulty in the OLT side, and same content repeats to transmit N time in the GPON section, waste bandwidth, the characteristic of not utilizing the natural support of GPON to broadcast well.In addition, consider from the fail safe aspect, because the characteristics of GPON itself, all Bao Jun are to all ONT or ONU by broadcast mode, as long as all ONT or the ONU that are connected to like this under this PON mouth all can receive this bag, do not get rid of the ONT or the ONU that there are some malice, not the bag of self with deliberately extracting, carry out the forgery of malice, the service security of PON system is caused a hidden trouble.
Summary of the invention
Purpose of the present invention provides the method for processing business in a kind of new GPON system, can avoid the waste of downlink bandwidth by broadcasting, simple and practical broadcasting and the inundation bag of transmitting safely of inundation.
The invention provides the processing method of downlink broadcast, flooded traffic in a kind of GPON system, may further comprise the steps:
Step 1 is provided with one at the OLT of GPON system and is exclusively used in GEM PORT ID or the VPI/VCI that sends broadcasting, flooded traffic;
Step 2 is provided with one at each ONT of above-mentioned OLT correspondence or ONU and is exclusively used in GEM PORT ID or the VPI/VCI that receives broadcasting, flooded traffic, and its GEMPORT ID or VPI/VCI with above-mentioned OLT setting is identical;
Step 3, when OLT receives broadcasting and inundation bag, GEM frame or the ATM frame that installs to above-mentioned GEM PORT ID or VPI/VCI sealed in this broadcasting and inundation, transport layer by GPON sends above-mentioned GEM frame or ATM frame to each ONT or ONU with the form of broadcasting, and ONT or ONU resolve this GEM frame or ATM frame according to self GEM PORT ID or VPI/VCI.
The processing method of above-mentioned downlink broadcast, flooded traffic also comprises encrypting step, at first generate key at above-mentioned OLT, key is sent to the ONT or the ONU of its trust, broadcast, when flooded traffic is handled, OLT encrypts above-mentioned GEM frame or ATM frame according to key, receives the ONT of above-mentioned key or GEM frame or the ATM frame that ONU utilizes this secret key decryption to receive.
After the ONT of described step 2 or ONU resolve above-mentioned broadcasting and inundation bag, ONT or ONU are forwarded to relevant User Network Interface (User Network Interface with it, be called for short UNI) or Internet protocol main frame (Internet Protocol Host is hereinafter to be referred as IP HOST) port.
OLT is when ONT or ONU transmission key, by each ONT or the independent channel transfer of encrypting of ONU.
OLT just changes above-mentioned key at set intervals, promptly at first carry out cipher key change with the ONT or the ONU of the existing key of its trust, after above-mentioned ONT or ONU all successfully carried out key updating, OLT specified enabling constantly of new key, and OLT and ONT or ONU enable at this and enable new key constantly.
Insert the GPON system at new ONT or ONU, and when being subjected to the trust of OLT, OLT sends to current key the ONT or the ONU of above-mentioned new access.
The present invention proposes the processing method of downlink broadcast, flooded traffic in a kind of GPON system.The OLT of GPON has a plurality of ports in the prior art, and each port connects an ONU or ONT, and each port has GEM PORT ID or VPI/VCI inequality.Therefore, when sending broadcasting or flooded traffic, will have GEM frame or the ATM frame of its corresponding GEMPORT ID or VPI/VCI for each ONU or ONU encapsulation one when encapsulation, the form with clean culture sends respectively again.So just need repeatedly copy, repeatedly send, waste system resource.The method that the present invention proposes is to set up one in the OLT side to be exclusively used in broadcasting, the GEM PORT ID or the VPI/VCI of flooded traffic, simultaneously set up an identical GEM PORT ID or a VPI/VCI at ONU or ONT side, utilize GPON to support the characteristic of broadcasting, to send to a plurality of ONT or ONU with the broadcasting and the inundation bag of a content, disposable all ONT or the ONU of allowing can both correctly receive broadcasting and inundation bag, do not need repeatedly to copy and repeatedly transmission, both improved the disposal ability of OLT, can improve the downlink bandwidth utilance again, can adopt the mode of encryption, improve safety of data, avoid the ONT of malice or ONU to carry out the forgery of malice; For relatively safer environment, also can not adopt the mode of encryption, raise the efficiency.
Description of drawings
Fig. 1 is the flow chart of the processing method of downlink broadcast in the GPON system of a preferred embodiment of the present invention, flooded traffic.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to introduce further, but not as a limitation of the invention.
As shown in Figure 1, the processing method of downlink broadcast, flooded traffic can may further comprise the steps in the GPON system of a preferred embodiment of the present invention:
Step 1 is created a GEM PORT ID or a VPI/VCI who is exclusively used in transmission at OLT, is used to broadcast, flooded traffic, and this GEM PORT ID or this VPI/VCI only handle the business of down direction, do not handle the business of up direction.
Step 2, each ONT or one of ONU establishment in the OLT correspondence are exclusively used in reception broadcasting, the GEM PORT ID or the VPI/VCI of flooded traffic, this GEM PORT ID or VPI/VCI are identical with GEM PORT ID or VPI/VCI that OLT creates, in order to handle the broadcasting of OLT, flooded traffic, use GEM port network connection end points (GEM Port Network ConnectionTerminal Point) or virtual path network connected terminal point (VC Network Connection TerminalPoint) broadband passive optical network (B-PON), be made as direction wherein descending unidirectional, promptly from Access Network interface (Access Network Interface, be called for short ANI) to the direction of UNI, it also only handles descending unidirectional business, create relevant GEM intercommunication termination point or intercommunication virtual path termination point and some other association attributeses, thereby set up unidirectional connection so that transmit this broadcasting and the inundation bag.
Step 3, on OLT, produce key, then specify reliable ONT or ONU, key is sent to these reliable ONT or ONU, it can be by the passage of encrypting separately, the channel transfer of GEM PORT ID or VPI/VCI sign for example, and reliable ONT or ONU can receive above-mentioned key, thereby correct parsing GEM frame or ATM frame obtain broadcasting and inundation bag.
Step 4, when OLT receives broadcasting and inundation bag, this is sealed in the GEM frame or ATM frame that installs to above-mentioned GEM PORTID or VPI/VCI, if key is arranged, convenient with key it is encrypted, the TC layer by GPON sends to each ONT or ONU with the processing mode of broadcasting, inundation.
Step 5, after ONT or ONU receive this GEM frame or ATM frame, if GEM PORT ID that this GEM frame or ATM frame are entrained or VPI/VCI are identical with GEMPORT ID or the VPI/VCI of ONT or ONU, if and this GEM frame or ATM frame are encrypted, ONT or ONU have the key that can decipher, then go out this broadcasting and inundation bag according to this GEM PORT ID or VPI/VCI and key-parsing, and with its forwarding, forward-path and target can be set according to the actual conditions of ONT or ONU, it can be forwarded to relevant UNI, ports such as IP HOST also can be provided with it again from UNI, forward on the ports such as IP HOST.
In this embodiment, create GEM PORT ID or VPI/VCI and do not have the requirement of sequencing in the time that ONT or ONU create GEM PORT ID or VPI/VCI at OLT, can be that OLT creates earlier, also can be that ONT or ONU create earlier, as long as GEM PORT ID or VPI/VCI are consistent.
The encrypting step of step 3 is provided with in order to improve professional encrypting step, and when safer, this step also can be omitted in the GPON system, and at this moment, encryption, decryption step in step 4 and the step 5 are also omitted.Safety for key, OLT just changes above-mentioned key at set intervals, promptly at first carry out cipher key change with the ONT or the ONU of the existing key of its trust, after above-mentioned ONT or ONU all successfully carry out key updating, OLT specifies enabling constantly of new key, start constantly at new key, for example certain frame of appointment begins to enable new key.The replacing frequency of above-mentioned key, the moment of the key of replacing and replacing key can initiatively be initiated by OLT.If new ONT or ONU insert the GPON system and do not obtain key, when the trust that is subjected to OLT, OLT sends to current key the ONT or the ONU of above-mentioned new access.Certainly, the mode of encryption is not limited to the above-mentioned mode of mentioning, and it can be any suitable cipher mode.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is made amendment or is equal to replacement, all should be encompassed in the middle of the protection range of claim of the present invention.
Claims (6)
1. the processing method of downlink broadcast, flooded traffic in the GPON system is characterized in that may further comprise the steps:
Step 1 is that the optical line terminal of Gbit passive optical network system is provided with one to be exclusively used in the GEM that sends broadcasting, flooded traffic be GPON method for packing port-mark or virtual path VPI at GPON;
Step 2, be provided with one at each Optical Network Terminal of above-mentioned optical line terminal correspondence or optical network unit and be exclusively used in GEM port-mark or the virtual path VPI that receives broadcasting, flooded traffic, its above-mentioned GEM port-mark or virtual path VPI with above-mentioned optical line terminal setting is identical;
Step 3, when optical line terminal receives broadcasting and inundation bag, it is the ATM frame that this broadcasting and inundation are sealed the GEM frame or the asynchronous transfer mode that install to above-mentioned GEM port-mark or virtual path VPI, transport layer by GPON sends above-mentioned GEM frame or ATM frame to each Optical Network Terminal or optical network unit with the form of broadcasting, and Optical Network Terminal or optical network unit are resolved this GEM frame or ATM frame according to self GEM port-mark or virtual path VPI.
2. processing method according to claim 1, it is characterized in that also comprising encrypting step, at first generate key at above-mentioned optical line terminal or optical network unit, key is sent to the Optical Network Terminal or the optical network unit of its trust, broadcast, when flooded traffic is handled, optical line terminal is encrypted above-mentioned GEM frame or ATM frame according to key, receives the Optical Network Terminal of above-mentioned key or GEM frame or the ATM frame that optical network unit utilizes this secret key decryption to receive.
3. processing method according to claim 1 is characterized in that after the Optical Network Terminal of described step 2 or optical network unit are resolved above-mentioned broadcasting and inundation bag it being forwarded to relevant User Network Interface or Internet protocol host port.
4. processing method according to claim 2 is characterized in that optical line terminal is when Optical Network Terminal or optical network unit transmission key, by the channel transfer to each Optical Network Terminal or the independent encryption of optical network unit.
5. processing method according to claim 4, it is characterized in that optical line terminal just changes above-mentioned key at set intervals, promptly at first carry out cipher key change with the Optical Network Terminal or the optical network unit of the existing key of its trust, after above-mentioned Optical Network Terminal or optical network unit all successfully carry out key updating, optical line terminal is specified enabling constantly of new key, and optical line terminal and Optical Network Terminal or optical network unit are enabled at this and enabled new key constantly.
6. processing method according to claim 4, it is characterized in that inserting the GPON system in new Optical Network Terminal or optical network unit, and when being subjected to the trust of optical line terminal, optical line terminal sends to current key the Optical Network Terminal or the optical network unit of above-mentioned new access.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101109730A CN101325460B (en) | 2007-06-12 | 2007-06-12 | Method for processing downstream broadcast and great-extension business of GPON system |
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| CN2007101109730A CN101325460B (en) | 2007-06-12 | 2007-06-12 | Method for processing downstream broadcast and great-extension business of GPON system |
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| CN101325460A true CN101325460A (en) | 2008-12-17 |
| CN101325460B CN101325460B (en) | 2012-04-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130825A (en) * | 2010-11-11 | 2011-07-20 | 华为技术有限公司 | Data processing method for passive optical network system, optical line terminal and system |
| CN102447568A (en) * | 2011-11-18 | 2012-05-09 | 烽火通信科技股份有限公司 | Method for treating downlinking broadcast, flooding business and multicasting business in gigabit passive optical network (GPON) system |
| CN111491221A (en) * | 2020-03-26 | 2020-08-04 | 烽火通信科技股份有限公司 | vO L T multicast method and O L T equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7535930B2 (en) * | 2003-04-10 | 2009-05-19 | Samsung Electronics Co., Ltd. | GEM frame structure showing payload type of frame and method for processing data thereof |
| US7450551B2 (en) * | 2003-07-14 | 2008-11-11 | Samsung Electronics Co., Ltd. | Multicast transmission method in GEM mode in Gigabit-capable passive optical network and method of processing frame |
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2007
- 2007-06-12 CN CN2007101109730A patent/CN101325460B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130825A (en) * | 2010-11-11 | 2011-07-20 | 华为技术有限公司 | Data processing method for passive optical network system, optical line terminal and system |
| CN102130825B (en) * | 2010-11-11 | 2014-01-08 | 华为技术有限公司 | Data processing method for passive optical network system, optical line terminal and system |
| CN102447568A (en) * | 2011-11-18 | 2012-05-09 | 烽火通信科技股份有限公司 | Method for treating downlinking broadcast, flooding business and multicasting business in gigabit passive optical network (GPON) system |
| CN102447568B (en) * | 2011-11-18 | 2014-12-24 | 烽火通信科技股份有限公司 | Method for treating downlinking broadcast, flooding business and multicasting business in gigabit passive optical network (GPON) system |
| CN111491221A (en) * | 2020-03-26 | 2020-08-04 | 烽火通信科技股份有限公司 | vO L T multicast method and O L T equipment |
| CN111491221B (en) * | 2020-03-26 | 2021-11-23 | 烽火通信科技股份有限公司 | vOLT multicast method and OLT equipment |
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| CN101325460B (en) | 2012-04-11 |
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