CN101102210A - A distributed controllable multicast system of passive optical network and its implementation method - Google Patents
A distributed controllable multicast system of passive optical network and its implementation method Download PDFInfo
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Abstract
The method comprises: both ONU and OLT transmit data by using the subscriber virtual channel and multicast virtual channel; said multicast data is transmitted from OLT to ONU via said multicast virtual channel; wherein, said multicast system comprises a IPTV service controlling module and a IPTV service executing module; the IPTV service controlling module is used to save the multicast right of each user; the information about said multicast right is transmitted to the IPTV executing module via said subscriber channel; said IPTV executing module is set on ONU and is used for saving the multicast right of each user; according to the multicast right of user and the request of user, ONU relays the multicast data to the port of each user.
Description
Technical field
The present invention relates to the multi-cast system of EPON, in particular, a kind of distributed controllable multicast system of passive optical network and its implementation.
Background technology
Flourish along with broadband access, more and more families have used the broadband access network business, and multicast service is exactly wherein most important a kind of broadband access network business.Multicast is very big to the demand of bandwidth, and the bandwidth of now a lot of access technologies can't satisfy following family and the business user demand to high bandwidth near the limit.
Therefore prior art has proposed EPON (PON, Passive Optical Network) technology, it uses optical transport technology, has long transmission distance, the advantage that transport tape is roomy, and owing to use passive bus, the maintainability of PON and availability, stability all are greatly improved.
Referring to Fig. 1, the PON network comprises three parts, local side apparatus OLT (Optical LineTerminal, optical line terminal), Optical Distribution Network ODN (Optical Distribution Network, Optical Distribution Network) and Optical Network Terminal ONU (Optical Network Unit, optical network unit).ONU is positioned over the position away from local side, at down direction, and aggregate user data.Uply link to each other with ODN by optical fiber.The input signal of video server is through IP/ATM (Asynchronous Transfer Mode, asynchronous transfer mode) Network Transmission is to OLT, ODN sends to some user terminals with the signal of OLT input according to power averaging, and the ratio of general beam split has 1: 16,1: 32 or 1: 64.
OLT converges the user data from ONU.Down direction, just from OLT to ONU, the The data broadcast mode.Each data and specific sign binding, such as at GPON (GigabytePON, gigabit passive optical network) in, this sign is gem port (GPON EncapsulationMethod port, the GPON encapsulation port), in EPON (Ethernet PON, Ethernet passive optical network), this sign is LLID (Logic Link Identifier, a LLID).After ONU receives these data, judge whether it is the data of oneself by corresponding sign.Up direction, each ONU is assigned with different time slots, thereby has realized sharing of link.
Be different from present topmost access technology DSL (Digital Subscriber Loop, digital subscriber line), the PON network has following important characteristic:
1) the PON mouth correspondence on OLT a plurality of ONU terminals.In DSL, the DSL port on DSLAM is a Modem (modulator-demodulator) of corresponding far-end only.
2) down direction The data broadcast mode.
3) owing to done planning in advance in design, OLT can active management ONU, has coupling more closely between the two.
Because the data of down direction are broadcasted, this is very favourable for multicast, because multicast packet can be used by numerous terminal uses.At present, in the existing multicast scheme, utilize the data broadcasting characteristics of down direction exactly, from OLT to ONU, create special multicast transmission passage.OLT obtains the group broadcasting program that the user asks by analyzing the request message of all IGMP from user side (IGMP).OLT passs all these requested multicast data flows to each descending PON light oral instructions, ONU receives after the multicast data flow, according to the needs of ONU oneself multicast data flow is filtered.Although above-mentioned multicast scheme can with multicast data flow correct be delivered to ONU, it can not control user's authority.When a plurality of users (port) were arranged under the ONU, ONU or OLT can not accurately control the visit of user port to multicast data flow.
In the control aspect, OLT and ONU have accurate coupled relation.PON provides special OAM (oam) passage to make things convenient for the control of OLT to ONU.And ONU also can only control by OLT, does not allow terminal use oneself to revise the configuration of ONU.That is to say that though ONU is in far-end, they are controlled by local side OLT fully.This framework is fit to the distributed system design very much.
But, in the prior art, under ONU, pick out a large amount of interfaces, during a plurality of terminal use of following extension, use centralized multi-cast system, OLT just need handle a large amount of protocol massages in the unit interval, often can not meet the demands on performance like this.Because need to handle a large amount of protocol massages, concerning OLT, need higher performance and more resources, if the processor of OLT is enough strong, just timely processing protocol message does not satisfy the requirement of system.Simultaneously, adopt centralized control, need OLT to make judgement ONU was set afterwards, the time delay that can cause the user to add is very long, influences user's audiovisual experience.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
The object of the present invention is to provide a kind of distributed controllable multicast system of passive optical network and its implementation, realization is to the control and the forwarding of multicast data flow from OLT to ONU of ONU multicast forwarding, improve the performance that OLT handles a large amount of protocol massages, strengthen user's audiovisual comfortableness.
Technical scheme of the present invention is as follows:
A kind of PON distributed controllable multicast system, it comprises that multicast packet sends to ONU by described multicast Virtual Channel from OLT by the ONU and the OLT of user's Virtual Channel and multicast Virtual Channel transmission data; Wherein, described multi-cast system also comprises IPTV message control module and IPTV Executive Module; Wherein, the IPTV message control module is used to store each user's described multicast authority, and the information of described multicast authority is sent to the IPTV Executive Module by described user's Virtual Channel; The IPTV Executive Module is arranged on ONU, is used to receive and store each user's described multicast authority; ONU is used for according to user's described multicast authority and user's request, and the control transmitting multicast data is to each user port.
Described multi-cast system, wherein, the IPTV message control module is arranged on OLT or independent the setting.
Described multi-cast system, wherein, the IPTV control module is provided with the arbitration functions module, when change takes place the described multicast authority that is used to judge the user, the information of described multicast authority is sent to the IPTV Executive Module.
Described multi-cast system, wherein, the IPTV Executive Module is provided with the call record module, the time point that is used for recording user request multicast service and leaves.
Described multi-cast system, wherein, the IPTV control module be provided for the programs stored channel channel table, be used to be provided with visit channel authority the set meal table, be used to be provided with the preview authority the preview table, be used to be provided with port and adopt the port set meal table of set meal and be used to write down the port authority list of each port the multicast list rights of using; And the IPTV Executive Module is provided for being provided with the preview table of preview authority and is used to write down the port authority list of each port to the multicast list rights of using.
Described multi-cast system, wherein, ONU is provided with first multicast forward table, first switching engine and an IGMP control module; And OLT is provided with second multicast forward table, second switching engine and the 2nd IGMP control module; Wherein, described first multicast forward table is used to preserve the mapping relations of multicast address, VLAN and user port, controls described first switching engine described transmitting multicast data is arrived corresponding user port; A described IGMP control module is used to intercept and analyzes the IGMP report message, and the described multicast authority according to the user of IPTV Executive Module upgrades described first multicast forward table and increases its list item; Described second multicast forward table is used to preserve the mapping relations of the multicast Virtual Channel of multicast address, VLAN and PON port, control described second switching engine with transmitting multicast data to corresponding multicast Virtual Channel; Described the 2nd IGMP control module is used to intercept and analyzes the IGMP report message, upgrades described second multicast forward table and increases its list item.
Described multi-cast system, wherein, ONU also comprises the Gigabit Ethernet MAC controller filtering module that is used to select enter the multicast packet of ONU, it is arranged between described multicast Virtual Channel and described first switching engine.
A kind of implementation method of PON controllable multicast system under environment, it comprises step, A1, stores each user's multicast authority; The ONU of A2, described multi-cast system receives user's request, sends to the OLT of described multi-cast system; A3, OLT receive user's request of ONU, judge user's multicast authority, according to the result, send control information to ONU; A4, ONU receive described control information, and the forwarding of group business stream is provided with, and the control user port is to the visit of multicast packet.
Described implementation method, wherein, in the steps A 1, described each user's multicast authority is stored in OLT or the independent server.
Described implementation method wherein, by user's Virtual Channel communicating control information, when OLT receives the request of user's Virtual Channel, is carried out user right according to user's multicast authority and is judged between OLT and the ONU, sends control information to ONU.
Described implementation method, wherein, in the steps A 3, OLT sends to ONU by PON OAM passage with control information.
Described implementation method, wherein, steps A 3 specifically comprises: B1, OLT intercept and analyze the IGMP report message; The described multicast authority of B2, search subscriber; B3, make the judgement that user or port whether can the access group multicast datas; B4, control information is sent to ONU.
Described implementation method, wherein, in the steps A 4, described control user port comprises the visit of multicast packet: C1, intercept and analyze the IGMP report message; The described multicast authority of C2, search subscriber; C3, carry out permission, refusal and preview operation respectively by described multicast authority.
Described implementation method wherein, also comprises step before the steps A 4: filter described multicast packet.
Described implementation method wherein, also comprises steps A 5: recording user request multicast service and the time point that leaves.
Adopt such scheme, the present invention has effectively utilized the design feature of PON, by creating the multicast Virtual Channel of being shared by a plurality of ONU (Tunnel), has reduced the multicast bandwidth from OLT to ONU effectively; And used the IPTV control point to carry out the mechanism that point separates, made the control of IPTV more quick with IPTV; This distributed control structure has also improved the performance of autgmentability, maintainability and the system of whole system, guarantees the manageability of system simultaneously.
Description of drawings
Fig. 1 is the basic framework figure of the PON Access Network of prior art;
Fig. 2 is a distributed controllable multicast system Organization Chart under the PON environment of the present invention;
Fig. 3 is the process chart of REPORT protocol massages under the ONU of the present invention;
Fig. 4 is the process chart of REPORT protocol massages under the OLT of the present invention;
Fig. 5 is the tables of data and the correlation schematic diagram thereof at IPTV of the present invention control point;
Fig. 6 is a multicast Virtual Channel schematic diagram of the present invention;
Fig. 7 is the flow chart of the inventive method.
Embodiment
Below preferred embodiment of the present invention is described in detail.
As shown in Figure 2, the invention provides a kind of PON distributed controllable multicast system, it comprises by the ONU of user's Virtual Channel and multicast Virtual Channel transmission data and OLT, IPTV (IPTV) message control module and IPTV Executive Module multicast Virtual Channel and being present between OLT and the ONU, PON mouth on each OLT has a multicast Virtual Channel that is used for the bearing downlink multicast data flow at least, and the multicast Virtual Channel is shared by all ONU under the PON mouth.After OLT receives multicast data flow, multicast data flow is sent among the multicast Virtual Channel, promptly multicast packet sends to ONU by described multicast Virtual Channel from OLT.
Wherein, the IPTV message control module can be arranged on OLT or independently be provided with as separate server, is used to store each user's described multicast authority, and the information of described multicast authority is sent to the IPTV Executive Module by described user's Virtual Channel.The IPTV message control module, promptly the IPTV decision point is the user right collocation point, has stored a plurality of users' multicast authority; Its reception is also finished the configuration of user's (port) authority, preserves all users' (port) IPTV multicast authority.The IPTV decision point is pushed to ONU with user's authority information, and ONU controls the forwarding of multicast data flow with this.When user right changed, IPTV needed the relevant ONU of announcement in time to upgrade.
When the IPTV message control module independently is provided with as separate server, the IPTV decision point can be directly and ONU set up communication port, the IPTV that authority information is pushed on the ONU carries out on the point; Perhaps create an IPTV service agent on OLT, the IPTV service agent on IPTV decision point and each OLT is set up communication port, pushes the authority of all ONU that OLT administered.By the IPTV service agent these authorities finally are pushed to ONU at last.
The IPTV Executive Module is arranged on ONU, is used to receive and store each user's described multicast authority.The IPTV Executive Module, promptly IPTV carries out point, accepts the user right information from the IPTV decision point, preserves the multicast authority of each port.Each increasing newly/revise the multicast forward table of ONU all needs to ask this module to make a decision, and described newly-increased and modification can adopt IGMP agreement control module to finish.
Like this, through calculating, utilize OAM (oam) passage that exists between OLT and the ONU, the IPTV decision point can be pushed to IPTV execution point with port authority list and preview table., just push the port authority information relevant herein with ONU, but not all.Whenever the tables of data configuration information changes, the IPTV decision point can be synchronized to these modifications IPTV in time and carry out point.
ONU is used for according to user's described multicast authority and user's request, and the control transmitting multicast data is to each user port.ONU accepts multicast packet from the multicast Virtual Channel, according to user's request, and the definition of user right, the control multicast flows to the forwarding of each user port, ONU does not have the scheme of controllable multicast in the prior art, that is to say, can not control the authority of UNI user port.
Wherein, between ONU and OLT, can have a plurality of Virtual Channels, but the PON mouth of each OLT exists all one to be the shared multicast Virtual Channel of the ONU under all these PON mouths.The group business stream of multicast Virtual Channel bearing downlink, as shown in Figure 6.Message from ONU to OLT can be walked the independent user Virtual Channel, carries multiplexing, the transmission course of the whole cells of user profile and all carries out on user's Virtual Channel.On OLT, if up IGMP protocol massages is walked independently Virtual Channel, the IGMP protocol processes mould module on the OLT needs the correct multicast forward table that is provided with so, and multicast data flow is incorporated on the multicast Virtual Channel.The mode of specific implementation is: each report message is an always corresponding source port, just user's Virtual Channel.The IGMP protocol module can find the PON mouth of user's Virtual Channel correspondence according to relevant configuration, finds corresponding multicast Virtual Channel then.When writing multicast forward table, outbound port uses the multicast Virtual Channel.
In the IPTV control module, the arbitration functions module can also be set, when change takes place in the described multicast authority that is used to judge the user, the information of described multicast authority is sent to the IPTV Executive Module, so just can only when change takes place multicast authority, just transmit information, increased the efficient of system.
Described call record module can also be set, the time point that is used for recording user request multicast service and leaves in the IPTV Executive Module.Like this, except the multicast access control of carrying out the user, IPTV carries out the function that point can also be realized CDR (Call Detail Record, call detail record).This function can recording user request multicast service and the time point that leaves.Operator utilizes this information, just can realize value-added functionalitys such as user's service billing and statistics.
The IPTV control module be provided for the programs stored channel channel table, be used to be provided with visit channel authority the set meal table, be used to be provided with the preview authority the preview table, be used to be provided with port and adopt the port set meal table of set meal and be used to write down the port authority list of each port the multicast list rights of using; And the IPTV Executive Module is provided for being provided with the preview table of preview authority and is used to write down the port authority list of each port to the multicast list rights of using.
Wherein, the IPTV decision point can be preserved the multicast authority configuration of all users (port) under the OLT by adopting following significant data table, and the relation between them as shown in Figure 5.
1) channel table: T_channel＜id, vlan, groupIP, previewID 〉, id is a keyword, and gIP is a multicast ip address, and preview-id is associated with certain list item of preview table T_preview.Vlan+groupIP is a candidate key.PreviewID is the external key that points to T_preview.
2) set meal table: T_package＜id, channelID, right 〉, id+channelID is a keyword, right identifies authority, and three kinds of authorities are arranged: allow (permit), refusal (deny) and preview.
3) preview table: T preview＜id, blackout, count, duration 〉, id is a keyword, blackout identifies the stand-by period minimum between twice preview, count represents the maximum preview number of times of every day, and duration represents the maximum duration of each preview.
4) port set meal table: T_portPackage＜port, packageID 〉, port+packageID is a keyword.That is to say that a port can be used several set meals.Herein, port refers to UNI (User Network Interface, the User Network Interface) port on the ONU.Port is unique in the OLT scope.
5) port authority list: T_portRight＜port, vlan, groupMAC, right, previewID 〉.Different with other several tables, the port authority list utilizes other four tables automatically to calculate and generates, rather than the content that directly disposes of user.Concrete computational methods belong to prior art, and this paper does not do detailed description once more.Port+vlan+groupMAC is a keyword, because there are mapping relations groupMAC and groupIP address, therefore the groupIP from T_channle always can extrapolate groupMAC.The port authority list has write down the rights of using of each port to multicast list.Right comprises refusal, permission and preview authority.When right was preview, preview authority just used previewID to remove to search out corresponding preview table, so just can know the preview parameter.
The keeper can pass through order line, telnet or pass through SNMP (Simple NetworkManagement Protocol, Simple Network Management Protocol) etc. mode comes each tables of data of configuration of IP TV control module that multicast authority is set, and comprises channel table, set meal table, preview table and port set meal table etc.For example adopt cli interface, be connected to equipment, finish the configuration of above-mentioned four tables of data by serial ports or telnet mode; Also can adopt SNMP webmaster mode, the network management interface by NMS (Network ManagemengSystem, network management system) comes configuration data, after configuration finishes, is pushed to OLT by snmp protocol, by NMS, can manage the multicast authority configuration of a plurality of OLT.In the implementation procedure of reality, can adopt above-mentioned one or more methods.
Wherein, an example of the preview table of IPTV Executive Module is as follows: T_preview＜id, blackout, count, duration 〉, id is a keyword, blackout identifies the stand-by period minimum between twice preview, count represents the maximum preview number of times of every day, and duration represents the maximum duration of each preview.
An example of the port authority list of IPTV Executive Module is as follows: T_portRight＜port, vlan, groupMAC, right, previewID 〉.Port+vlan+groupMAC is a keyword.The port authority list has write down the rights of using of each port to multicast list.Right comprises three kinds of authorities, permission, refusal and preview.When right was preview, preview authority just used previewID to remove to search out corresponding preview table, so just can know the preview parameter.
Described multi-cast system can be provided with first multicast forward table, first switching engine and an IGMP control module at ONU; And, second multicast forward table, second switching engine and the 2nd IGMP control module are set at OLT; Below this is made detailed description.
Described first multicast forward table is used to preserve multicast address, VLAN (VLAN, VirtualLocal Area Network) and the mapping relations of user port, control described first switching engine with described multicast packet, promptly multicast data flow is forwarded to corresponding user port.Multicast forward table is the core that multicast service is transmitted, and can use T_multicast to represent multicast forward table＜vlan, groupMAC, port, aging-timer 〉, vlan+groupMAC is a keyword.Access device is a two-layer equipment, and multicast forward table uses multicast mac address.The aging-timer ageing time is initially set to maximum aging time.System reduces this parameter automatically, up to 0.If to 0, then system deletes this list item automatically.
As mentioned above, described first switching engine, i.e. forwarding engine, according to described first multicast forward table, multicast data forwarding stream.Forwarding engine can be a blocks of data exchange chip, and the reflection of T multicast is arranged in this chip, but does not need aging-timer; Forwarding engine comes multicast data forwarding according to multicast forward table.
A described IGMP control module is used to intercept and analyze the IGMP report message by ONU, according to the user's of IPTV Executive Module described multicast authority, control multicast forward table; Specifically, described control comprises described first multicast forward table of renewal and increases its list item.IGMP agreement control module processing protocol message is realized IGMP snooping function.It can adopt IGMP module controls exchange chip to realize, allow exchange chip that the IGMP protocol massages " is grabbed " in the IGMP protocol module, but the IGMP module is just handled report (report) message from the user, IGMP agreement control module is directly controlled the increase and the renewal of multicast forward table, carry out the request that point is judged IGMP agreement control module by IPTV then, judge whether the user possesses the access rights to multicast.
Wherein, ONU can also comprise the Gigabit Ethernet MAC controller filtering module that is used to select enter the multicast packet of ONU, and it is arranged between described multicast Virtual Channel and described first switching engine.Because the cast communication between from OLT to ONU adopts broadcast mode, concerning specific ONU, affirm that existence does not need the multicast data flow that flows into, if do not add control, exchange chip just need be transmitted these multicast data flows, and consumes switching performance in vain.For systematic function is provided, the multicast data flow before entering exchange chip is filtered in advance and is just seemed very necessary.
As shown in Figure 2, the present invention can also increase a GMAC (Gigabit Ethernet MAC controller) filtering module.This module is placed in the PON optical processing hardware.For example, at the GMAC filtering module, there is a filter table T_filter＜vlan, groupMAC 〉.The list item that only exists in filter table, corresponding multicast data flow just can enter into switching engine.
Increase and the renewal of IGMP agreement control module control T_filter.For this reason, need increase the reflection of T_filter at the IGMP protocol module, but many field aging-timer.Overtime as aging-timer, system deletes the list item of T_filter correspondence automatically.The list item ageing time of T_filter need guarantee the same with the ageing time of T_multicast list item.
When IGMP agreement control module increases the T_multicast list item newly, utilize T_multicast＜vlan, groupMAC〉information, newly-increased T_filter list item, the timing of the aging-timer of T_filter list item is set to the ageing time of system configuration.Whenever IGMP agreement control module renewal T_multicast performance, IGMP also upgrades the T_filter list item.Need to prove, need to put in advance some well-known multicast address among the T_filter, as the multicast address of IGMP agreements such as 224.0.0.1 use.These addresses are not aging.
Described second multicast forward table is used to preserve the mapping relations of the multicast Virtual Channel of multicast address, VLAN and PON port, control described second switching engine with transmitting multicast data to corresponding multicast Virtual Channel; First multicast forward table among its function and the ONU is in full accord, and the function of described second switching engine also with ONU in first switching engine in full accord.
Described the 2nd IGMP control module is used to intercept and analyze the IGMP report message by OLT, upgrades described second multicast forward table and increases its list item.IGMP control module basically identical among its function and the ONU, but there is following difference:
I. do not need to be controlled by IPTV and carry out point.That is to say that this module does not have the decision problem of user right, as long as user's request just allows.
Ii. there is not the GMAC filtering module,, therefore can not need to control the GMAC filtering module owing to need not filtering information.
On the basis of above-mentioned multi-cast system, as shown in Figure 7, the invention allows for a kind of implementation method of PON controllable multicast system under environment, it may further comprise the steps.
A1, store each user's multicast authority; Described each user's multicast authority is stored in OLT or the independent server.Specifically as above-mentioned, the module that can adopt IPTV control module or other to possess memory function realizes this function, and these functional modules can be integrated in OLT, also can adopt separate server to realize.
The ONU of A2, described multi-cast system receives user's request, sends to OLT; Wherein, pass through user's Virtual Channel communicating control information between OLT and the ONU.
The OLT of A3, described multi-cast system receives user's request of ONU, judges user's multicast authority, according to the result, sends control information to ONU; OLT can pass through PON OAM passage, and control information is sent to ONU.When OLT receives the request of ONU by user's Virtual Channel, carry out user right according to user's multicast authority and judge, send control information to ONU.Steps A 3 specifically can comprise: B1, OLT intercept and analyze the IGMP report message; The described multicast authority of B2, search subscriber; B3, make the judgement that user or port whether can the access group multicast datas; B4, control information is sent to ONU.
A4, ONU receive described control information, and the forwarding of group business stream is provided with, and the control user port is to the visit of multicast packet.Multicast packet sends to ONU by described multicast Virtual Channel from OLT.In the steps A 4, described control user port comprises the visit of multicast packet: C1, intercept and analyze the IGMP report message; The described multicast authority of C2, search subscriber; C3, carry out permission, refusal and preview operation respectively by described multicast authority.
Before steps A 4, can also comprise step: filter described multicast packet.
After steps A 4, can also comprise steps A 5: recording user request multicast service and the time point that leaves.
Specifically, as shown in Figure 3, on ONU, the handling process of REPORT protocol massages is as follows.
1) beginning.
2) IGMP snooping is to the REPORT message, and suppose that the report content of message is: user port Pi wants to visit VLAN
jUnder multicast group G
kIGMP inquiry IPTV carries out point.
3) IPTV carries out point and watches T_portRight, sees if there is＜P
i, VLAN
j, G
kList item.If the permission authority forwards 4 to; If the authority preview, and satisfy the number of visits regulation, forward 7 to); Otherwise, forward 8 to).
4) igmp querying T_multicast table, judgement＜VLAN
j, G
k, P
iWhether exist.If there is no, execution in step 5); Otherwise forward 6 to).
5) newly-increased one＜VLAN
j, G
k, P
i, aging-time〉and to T_multicast, wherein aging-time is arranged to the ageing time of port default.Change step 10).
6) refresh the aging-timer of corresponding list item, time of aging-timer is re-set as the acquiescence ageing time of port.Change step 10).
7) at this list item of T_portRight,, start the preview timer according to the preview parameter.Forward step 4) to.
8) judge in the T_multicast table, whether exist＜VLAN
j, G
k, P
iList item.If there is no, change 10) end process.Otherwise, step below carrying out.
9) the corresponding list item among the deletion T_multicast.
10) finish.
As shown in Figure 4, on OLT, the handling process of REPORT protocol massages is as follows.
1) beginning
2) the IGMP module listens to Report message.Suppose that the report content of message is: user port P
iWant to visit VLAN
jUnder multicast group G
k
3) igmp querying T_multicast module has judged whether＜VLAN
j, G
k, P
iThe list item existence.If there is no, execution in step 4), otherwise change 5).
4) newly-increased one＜VLAN
j, G
k, P
i, aging-time〉and to T_multicast, the aging-time ageing time being arranged to dispose wherein.Change 6).
5) refresh the aging-timer of corresponding list item, time of aging-timer is re-set as the acquiescence ageing time of port.
6) finish.
In the prior art, decision point merges with the execution point, and of the present invention focusing on separated decision point with the execution point, and ONU carries out point, and decision point pushes information to ONU.IPTV on IPTV decision point and the ONU carries out the professional control subsystem of IPTV that point has been formed whole multi-cast system.Adopt this distributed design, simplified the control and the management of operator, also increased the flexibility of system.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (15)
1, a kind of distributed controllable multicast system of passive optical network, it comprises that multicast packet sends to described Optical Network Terminal by described multicast Virtual Channel from described optical line terminal by the Optical Network Terminal and the optical line terminal of user's Virtual Channel and multicast Virtual Channel transmission data; It is characterized in that described multi-cast system also comprises interactive network TV service control module and IPTV Executive Module; Wherein,
Described interactive network TV service control module is used to store each user's described multicast authority, and the information of described multicast authority is sent to described IPTV Executive Module by described user's Virtual Channel;
Described IPTV Executive Module is arranged on described Optical Network Terminal, is used to receive and store each user's described multicast authority;
Described Optical Network Terminal is used for according to user's described multicast authority and user's request, and the control transmitting multicast data is to each user port.
2, multi-cast system according to claim 1 is characterized in that, described interactive network TV service control module is arranged on described optical line terminal or independent the setting.
3, multi-cast system according to claim 1, it is characterized in that, described IPTV control module is provided with the arbitration functions module, when change takes place the described multicast authority that is used to judge the user, the information of described multicast authority is sent to described IPTV Executive Module.
4, multi-cast system according to claim 1 is characterized in that, described IPTV Executive Module is provided with the call record module, the time point that is used for recording user request multicast service and leaves.
5, multi-cast system according to claim 1, it is characterized in that, described IPTV control module be provided for the programs stored channel channel table, be used to be provided with visit channel authority the set meal table, be used to be provided with the preview authority the preview table, be used to be provided with port and adopt the port set meal table of set meal and be used to write down the port authority list of each port the multicast list rights of using;
And described IPTV Executive Module is provided for being provided with the preview table of preview authority and is used to write down the port authority list of each port to the multicast list rights of using.
6, multi-cast system according to claim 1 is characterized in that, described Optical Network Terminal is provided with first multicast forward table, first switching engine and the first IGMP control module; And described optical line terminal is provided with second multicast forward table, second switching engine and the second IGMP control module; Wherein,
Described first multicast forward table is used to preserve the mapping relations of multicast address, VLAN and user port, controls described first switching engine described transmitting multicast data is arrived corresponding user port;
The described first IGMP control module is used to intercept and analyzes the internet set managerial protocol report message, and the described multicast authority according to the user of described IPTV Executive Module upgrades described first multicast forward table and increases its list item;
Described second multicast forward table is used to preserve the mapping relations of the multicast Virtual Channel of multicast address, VLAN and passive optical network port, control described second switching engine with transmitting multicast data to corresponding multicast Virtual Channel;
The described second IGMP control module is used to intercept and analyzes the internet set managerial protocol report message, upgrades described second multicast forward table and increases its list item.
7, multi-cast system according to claim 6, it is characterized in that, described Optical Network Terminal also comprises the Gigabit Ethernet MAC controller filtering module that is used to select enter the multicast packet of described Optical Network Terminal, and it is arranged between described multicast Virtual Channel and described first switching engine.
8, a kind of implementation method of controllable multicast system under environment of passive optical network, it comprises step,
A1, store each user's multicast authority;
The Optical Network Terminal of A2, described multi-cast system receives user's request, sends to the optical line terminal of described multi-cast system;
A3, described optical line terminal receive user's request of described Optical Network Terminal, judge user's multicast authority, according to the result, send control information to described Optical Network Terminal;
A4, described Optical Network Terminal receive described control information, and the forwarding of group business stream is provided with, and the control user port is to the visit of multicast packet.
9, implementation method according to claim 8 is characterized in that, in the steps A 1, described each user's multicast authority is stored in described optical line terminal or the independent server.
10, implementation method according to claim 8, it is characterized in that, pass through user's Virtual Channel communicating control information between described optical line terminal and the described Optical Network Terminal, when described optical line terminal receives the request of user's Virtual Channel, multicast authority according to the user carries out the user right judgement, sends control information to described Optical Network Terminal.
11, implementation method according to claim 8 is characterized in that, in the steps A 3, described optical line terminal sends to described Optical Network Terminal by the oam passage of EPON with control information.
12, implementation method according to claim 8 is characterized in that, steps A 3 specifically comprises:
The internet set managerial protocol report message is intercepted and analyzed to B1, described optical line terminal;
The described multicast authority of B2, search subscriber;
B3, make the judgement that user or port whether can the access group multicast datas;
B4, control information is sent to described Optical Network Terminal.
13, implementation method according to claim 8 is characterized in that, in the steps A 4, described control user port comprises the visit of multicast packet:
C1, intercept and analyze the internet set managerial protocol report message;
The described multicast authority of C2, search subscriber;
C3, carry out permission, refusal and preview operation respectively by described multicast authority.
14, implementation method according to claim 8 is characterized in that, also comprises step before the steps A 4: filter described multicast packet.
15, implementation method according to claim 8 is characterized in that, also comprises steps A 5: recording user request multicast service and the time point that leaves.
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