CN1855834A - Method for multicast via passive optical network - Google Patents
Method for multicast via passive optical network Download PDFInfo
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- CN1855834A CN1855834A CN 200510034337 CN200510034337A CN1855834A CN 1855834 A CN1855834 A CN 1855834A CN 200510034337 CN200510034337 CN 200510034337 CN 200510034337 A CN200510034337 A CN 200510034337A CN 1855834 A CN1855834 A CN 1855834A
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Abstract
The method comprises: in case of multi optical network users having multicast receiving right, the optical network line terminal allocates one downlink service channel for same multicast and sends one multicast bit-stream; the optical network line terminal opens the right to use said downlink service channel for said users having multicast receiving right in order to make said users capable of receiving said multicast bit-stream. The method also can be implemented by means of generating a key at the optical network line terminal, and said key is used as the public key of the multicast and is used to encrypt the multicast bit-stream while said key is transmits to optical user end having multicast receiving right by using another service channel in order to make user end receive and decrypt the encrypted bit-stream.
Description
Technical field
The present invention relates to EPON (PON) technical field, relate in particular to a kind of method that realizes passive optical network multicast.
Background technology
In recent years, along with the fast development of the Internet and popularizing of PC, the surge of Internet data flow has aggravated to insert the capacity limit of part, and traditional copper cable access way obviously can't satisfy the demand that communication service increases in the Access Network.Because optical fiber has advantages such as transmission frequency bandwidth, capacity is big, loss is low, antijamming capability is strong, be suitable as very much the transmission medium of high speed, broadband services.And in various smooth access technologies, PON (EPON) owing to adopt passive bus, lay low with operation expense, transparent and be easy to advantage such as upgrading and receive much concern to business.
PON (EPON) is that present and following light inserts very promising technology, broadband access optical fiber technology as a kind of emerging last kilometer of covering, it does not need node device at optical branch point, only need that a simple optical branching device is installed and get final product, therefore have the cable resource of saving, bandwidth resources share, save machine room investment, device security height, networking speed soon, comprehensive networking low cost and other advantages.Simultaneously, digital multimedia signal also more and more is subjected to people's favor, and the application such as program request, multicast and broadcasting by access network realization video or audio frequency will appear in the present and later network access system more.
Be illustrated in figure 1 as PON multicast network structural representation, EPON inserts signal from optical network line terminal (OLT), by Optical Distribution Network (ODN) distribute to each user side (ONU/ONT, ONT is an optic network user terminal, is located immediately at user side; And ONU is the optical-fiber network subscriber unit, and also has other network such as Ethernet between the user), can watch multi-media signal at user side.Wherein OLT is positioned at local side, and ONU/ONT is positioned at user side, and OLT is a down direction to the direction of ONU/ONT, otherwise is up direction.Down direction adopts based on time-multiplexed multicast mode, will be assigned to some output user sides by power averaging by the light signal of OLT input by ODN, branch prescription case such as generally have 1 minute 16,1 minutes 32 or 1 minutes 64.
Be illustrated in figure 2 as prior art OLT multicast packets replicating principle schematic diagram, method of multicasting is, in OLT local side processed group sowing time, multicast packets is copied into a plurality of multicast packets, and the user side ONU/ONT that has added multicast receives corresponding multicast replication bag respectively.
When the shortcoming of prior art is that each multicast channel has a plurality of user applies, OLT will be copied into a plurality of packets, and timesharing transmits to ONU/ONT, and each ONU/ONT obtains corresponding packet, therefore, will take more downlink data bandwidth.For example: 10 multicast channels are arranged, 10 user applies are on average arranged, establish data flow when being 5Mbit/s, then downlink bandwidth with occupied bandwidth is: 10 * 10 * 5=500Mbit/s.
Summary of the invention
Technical problem to be solved by this invention is: take the deficiency of more downlink data bandwidth when overcoming the prior art passive optical network multicast, a kind of method that realizes passive optical network multicast is provided, reduce in the multicast downlink transfer occupied bandwidth to frequency band.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The method of this realization passive optical network multicast, for a plurality of optical-fiber network user sides with multicast reception authority, the optical network line terminal is distributed a downlink business passage for same multicast, only sends a multicast traffic stream; The optical network line terminal makes this optical-fiber network user side can receive this multicast traffic stream to having the authority that optical-fiber network user side that multicast receives authority is opened described downlink business passage.
Can produce a key by the optical network line terminal, and, when sending multicast traffic stream, utilize this key to encrypt the public keys of this key as this multicast; And utilizing another service channel to send to have multicast to receive the optical-fiber network user side of authority this key, the optical-fiber network user side utilizes this key that multicast traffic stream is decrypted, and receives this multicast traffic stream.
Can be earlier send the multicast application to the optical network line terminal by the optical-fiber network user side, the optical network line terminal to multicast application handle, whether distribute multicast according to the user right decision again to this optical-fiber network user side.If the user does not have multicast authority, the optical network line terminal is not handled this multicast application; If the user has multicast authority, and when also not having this multicast, then processing procedure is as follows:
A1, optical network line terminal upwards application obtain new data multicast;
A2, this multicast of optical network line terminal distribution take a downlink business passage;
A3, produce a key by the optical network line terminal, and the public keys of this key as this multicast;
A4, optical network line terminal use another service channel that this key is sent to corresponding optical-fiber network user side;
The downlink business passage that A5, the utilization of optical network line terminal are distributed is opened the authority of this downlink business passage as the muticast data transmission passage to the optical-fiber network user side that authority is arranged;
A6, optical network line terminal send after to the multicast packet stream encryption according to key, and the optical-fiber network user side that authority is arranged is according to this key receiving multicast data stream.
If the user has multicast authority, and when having had this multicast, then processing procedure is as follows:
B1, optical network line terminal use another service channel that the public keys of this multicast is sent to this optical-fiber network user side;
B2, optical network line terminal are opened the authority of downlink business passage to this optical-fiber network user side;
B3, optical-fiber network user side receive the encrypted group broadcast data flow according to the multicast public keys.
When the optical-fiber network user side will withdraw from multicast, leave the multicast application by the optical-fiber network user side to the transmission of optical network line terminal, the optical network line terminal processes is left the multicast group application, closes the downlink business passage authority of this this multicast of user.If last multicast user, then the optical network line terminal sends to higher level's network and leaves the multicast application, and the optical network line terminal stops to receive this multicast data flow from higher level's network, closes the use of this multicast channel.
Described service channel can adopt channel number, virtual channel identifier or Virtual Path Identifier sign.Described optical-fiber network user side can be optical-fiber network subscriber unit or optic network user terminal.
Beneficial effect of the present invention is: utilize the present invention, only need to send a multicast traffic stream and can realize the PON multicast, saved the downlink data bandwidth.OLT provides better bandwidth ability can for descending multicast user, and what user applies no matter each multicast channel have, and can not influence descending transmission data bandwidth, so system can provide more multicast channels to use simultaneously to the user.Can encrypt multicast traffic stream, and key is sent to user side, user side is decrypted according to key, has so further guaranteed the fail safe of multicast packet, guarantees to have the user of multicast authority just can receive multicast packet.
Description of drawings
Fig. 1 is a PON multicast network structural representation;
Fig. 2 is a prior art OLT multicast packets replicating principle schematic diagram;
Fig. 3 realizes principle schematic for OLT multicast of the present invention;
Fig. 4 is multicast application process figure of the present invention;
Fig. 5 withdraws from flow chart for multicast of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
As shown in Figure 3, the invention provides a kind of method that realizes passive optical network multicast, multicast agent is placed in the optical network line terminal (OLT), i.e. the multicast application of each user side (as ONU/ONT) sends to OLT, OLT handles the multicast application, sends multicast traffic stream to ONU/ONT.When a plurality of ONU/ONT applied for same multicast traffic stream, OLT utilized a service channel only to send a multicast traffic stream, applies for that the ONU/ONT of this multicast all obtains the reception authority of this multicast traffic stream, thereby realized multicast functionality.
Can produce a key by OLT, and, when sending multicast traffic stream, utilize this key to encrypt the public keys of this key as this multicast; And utilize another service channel to send to have multicast to receive the optical-fiber network user side of authority this key, the optical-fiber network user side utilizes this key that multicast traffic stream is decrypted, receive this multicast traffic stream, guarantee to have the user of multicast authority just can receive multicast packet like this.
Be illustrated in figure 4 as multicast application process figure of the present invention, the multicast procedure to apply is as follows:
1, sends IGMP (IGMP) bag application multicast by user side (is that example describes with ONU) to OLT;
2, OLT handles the multicast application, and according to user right, whether decision distributes multicast;
If 3 users do not have multicast authority, then OLT no longer handles this multicast application; If the user has multicast authority, then OLT handles multicast;
4, OLT processed group sowing time, if also there is not this multicast, then processing procedure is as follows:
1) OLT upwards applies for obtaining new data multicast, produces a multicast address and multicast data flow;
2) OLT distributes this multicast to take a downlink business passage (can be identified by channel number Port-ID, Virtual Path Identifier VPI or virtual channel identifier address VCI, Port-ID is a field of GPON Frame minor structure GEM frame, for the multiplexed business among the PON provides service identification; VPI/VCI is the field in the GPON Frame minor structure ATM frame);
3) produce a key by OLT, OLT is the public keys of this key as this multicast;
4) OLT uses another service channel (can be identified by channel number Port-ID, Virtual Path Identifier VPI, virtual channel identifier address VCI) that this key is sent to corresponding ONU user;
5) OLT utilizes the downlink business passage that is distributed as the muticast data transmission passage, opens the authority of this downlink business passage to the multicast user that authority is arranged;
6) OLT utilizes described key that multicast traffic stream is carried out encrypting and transmitting, and ONU is decrypted according to received key, thereby obtains multicast packet.
If there has been this multicast, then treatment step is as follows:
1) OLT opens the authority of another specific transactions passage to this user, and uses the specific transactions passage that the public keys of this multicast is sent to this ONU user;
2) OLT opens the authority of multicast downlink business passage to this user;
3) ONU is decrypted according to received key, thereby obtains multicast packet.
Be illustrated in figure 5 as multicast of the present invention and withdraw from flow chart, step is as follows:
1, ONU sends IGMP to OLT and leaves the multicast group application;
2, OLT handles and leaves the multicast application, closes the service channel authority of this this multicast of user;
3, if not last multicast user, then OLT does not carry out any extra process, waits for other multicast information command process;
If last multicast user, then OLT sends IGMP to higher level's network and leaves the multicast group application, and OLT stops to receive this multicast data flow from higher level's network, closes the use of multicast channel, waits for other multicast information command process.
Certainly, OLT also can not produce key, can directly send multicast traffic stream to ONU/ONT by OLT.That is, OLT utilizes a service channel to send a multicast traffic stream, distributes multicast to receive authority by management channels or other passages to ONU by OLT, only has the ONU/ONT that receives authority and just can obtain this multicast traffic stream.Same this not encryption method also only needs to send a multicast traffic stream and can realize the PON multicast.
Utilize the present invention, use identical services passage (as the service channel of identical Port-ID or VPI/VCI) to give same multicast user's transport multicast encrypting traffic, use the different business passage to give the different user transport multicast encryption key of same multicast respectively.Make like this in the connecting system of PON network, reduced traditional group and sowed in the row transmission occupied bandwidth frequency band, OLT provides better bandwidth ability can for descending multicast user, what user applies no matter each multicast channel have, can not influence descending transmission data bandwidth, system can provide more multicast channels to use simultaneously to the user.Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (9)
1, a kind of method that realizes passive optical network multicast is characterized in that:
For a plurality of optical-fiber network user sides with multicast reception authority, the optical network line terminal is distributed a downlink business passage for same multicast, only sends a multicast traffic stream;
The optical network line terminal makes this optical-fiber network user side can receive this multicast traffic stream to having the authority that optical-fiber network user side that multicast receives authority is opened described downlink business passage.
2, the method for realization passive optical network multicast according to claim 1 is characterized in that: produce a key by the optical network line terminal, and the public keys of this key as this multicast, when sending multicast traffic stream, utilize this key to encrypt; And utilizing another service channel to send to have multicast to receive the optical-fiber network user side of authority this key, the optical-fiber network user side utilizes this key that multicast traffic stream is decrypted, and receives this multicast traffic stream.
3, the method for realization passive optical network multicast according to claim 1 and 2, it is characterized in that: send the multicast application by the optical-fiber network user side to the optical network line terminal earlier, the optical network line terminal to multicast application handle, whether distribute multicast according to user right decision again to this optical-fiber network user side.
4, the method for realization passive optical network multicast according to claim 3 is characterized in that: if the user does not have multicast authority, the optical network line terminal is not handled this multicast application; If when the user had multicast authority and also do not have this multicast, then processing procedure was as follows:
A1, optical network line terminal upwards application obtain new data multicast;
A2, this multicast of optical network line terminal distribution take a downlink business passage;
A3, produce a key by the optical network line terminal, and the public keys of this key as this multicast;
A4, optical network line terminal use another service channel that this key is sent to corresponding optical-fiber network user side;
The downlink business passage that A5, the utilization of optical network line terminal are distributed is opened the authority of this downlink business passage as the muticast data transmission passage to the optical-fiber network user side that authority is arranged;
A6, optical network line terminal send after to the multicast packet stream encryption according to key, and the optical-fiber network user side that authority is arranged is according to this key receiving multicast data stream.
5, the method for realization passive optical network multicast according to claim 4 is characterized in that: if the user has multicast authority, and when having had this multicast, then processing procedure is as follows:
B1, optical network line terminal use another service channel that the public keys of this multicast is sent to this optical-fiber network user side;
B2, optical network line terminal are opened the authority of downlink business passage to this optical-fiber network user side;
B3, optical-fiber network user side receive the encrypted group broadcast data flow according to the multicast public keys.
6, the method for realization passive optical network multicast according to claim 3, the optical-fiber network user side it is characterized in that: when will withdraw from multicast, leave the multicast application by the optical-fiber network user side to the transmission of optical network line terminal, the optical network line terminal processes is left the multicast group application, closes the downlink business passage authority of this this multicast of user.
7, the method for realization passive optical network multicast according to claim 6, it is characterized in that: if last multicast user, then the optical network line terminal sends to higher level's network and leaves the multicast application, the optical network line terminal stops to receive this multicast data flow from higher level's network, closes the use of this multicast channel.
8, the method for realization passive optical network multicast according to claim 3 is characterized in that: described service channel is by channel number, virtual channel identifier or Virtual Path Identifier sign.
9, the method for realization passive optical network multicast according to claim 3 is characterized in that: described optical-fiber network user side is optical-fiber network subscriber unit or optic network user terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510034337 CN1855834A (en) | 2005-04-20 | 2005-04-20 | Method for multicast via passive optical network |
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| CN 200510034337 CN1855834A (en) | 2005-04-20 | 2005-04-20 | Method for multicast via passive optical network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008141505A1 (en) * | 2007-05-22 | 2008-11-27 | Zte Corporation | Multicast method and its device for gigabit passive optical network system |
| WO2010148871A1 (en) * | 2009-11-20 | 2010-12-29 | 中兴通讯股份有限公司 | Passive optical network system for wavelength division and time division hybrid multiplexing |
| WO2011088700A1 (en) * | 2010-01-25 | 2011-07-28 | 中兴通讯股份有限公司 | Method and device for encrypting multicast service in passive optical network system |
| WO2012109863A1 (en) * | 2011-07-29 | 2012-08-23 | 华为技术有限公司 | Multicast program forwarding method, device and system |
| US8457494B2 (en) | 2007-09-28 | 2013-06-04 | Huawei Technologies Co., Ltd. | PON multicast communication system, multicast management method, and corresponding devices |
-
2005
- 2005-04-20 CN CN 200510034337 patent/CN1855834A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008141505A1 (en) * | 2007-05-22 | 2008-11-27 | Zte Corporation | Multicast method and its device for gigabit passive optical network system |
| US8457494B2 (en) | 2007-09-28 | 2013-06-04 | Huawei Technologies Co., Ltd. | PON multicast communication system, multicast management method, and corresponding devices |
| WO2010148871A1 (en) * | 2009-11-20 | 2010-12-29 | 中兴通讯股份有限公司 | Passive optical network system for wavelength division and time division hybrid multiplexing |
| CN102075819A (en) * | 2009-11-20 | 2011-05-25 | 中兴通讯股份有限公司 | Wave time division mixed multiplexing passive optical network system |
| WO2011088700A1 (en) * | 2010-01-25 | 2011-07-28 | 中兴通讯股份有限公司 | Method and device for encrypting multicast service in passive optical network system |
| US20120308006A1 (en) * | 2010-01-25 | 2012-12-06 | Zte Corporation | Method and Device for Encrypting Multicast Service in Passive Optical Network System |
| US8942378B2 (en) | 2010-01-25 | 2015-01-27 | Zte Corporation | Method and device for encrypting multicast service in passive optical network system |
| WO2012109863A1 (en) * | 2011-07-29 | 2012-08-23 | 华为技术有限公司 | Multicast program forwarding method, device and system |
| US9065663B2 (en) | 2011-07-29 | 2015-06-23 | Huawei Technologies Co., Ltd. | Method, apparatus and system for forwarding multicast program |
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