CN101047444B - Method for optical network unit depart from multicast set in passive optical network system - Google Patents
Method for optical network unit depart from multicast set in passive optical network system Download PDFInfo
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- CN101047444B CN101047444B CN2006100781980A CN200610078198A CN101047444B CN 101047444 B CN101047444 B CN 101047444B CN 2006100781980 A CN2006100781980 A CN 2006100781980A CN 200610078198 A CN200610078198 A CN 200610078198A CN 101047444 B CN101047444 B CN 101047444B
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Abstract
A method separating optical network unit in passive optical network system from multicast set includes obtaining a message if separating an optical network unit from multicast set by optical link terminal, deleting off information said optical network unit in corresponding relation by said optical link terminal and judging whether information of optical network unit in said corresponding relationis empty or not, detecting message continuously if it is not or otherwise stopping transmission of multicast data at all multicast set.
Description
Technical field
The present invention relates to a kind of method of leaving multicast group in passive optical network, particularly a kind of in EPON, optical network unit leaves the method for multicast group fast.
Background technology
Present broadband access technology is mainly copper wire access technology (for example various digital user wire DSL technology) and light access technology (for example Fiber to the home FTTH, perhaps Fiber-To-The-Building FTTB, Fiber To The Curb FTTC access technology), by various access technologies, the user is linked on the broadband network.EPON (Passive Optical Network is called for short PON) access technology is a kind of of FTTH access technology, and the PON technology is the light access technology that a kind of point-to-multipoint transmits.The PON networking mode as shown in Figure 1, typical PON connecting system is by optical line terminal (Optical line terminal, abbreviation OLT), optical distributed network (Optical Distribute Network is called for short ODN) and optical network unit (OpticalNetwork Unit is called for short ONU) are formed.OLT is the equipment of network side in the optical access network, connects one or more ONU (OpticalNetwork Unit) by passive ODN (Optical Distribute Network).ONU is a user side equipment, and an end is connected with ODN, and the other end and the local network of users (Customer Premises network is called for short CPN) are connected.Downlink traffic arrives ONU by OLT, adopt the mode of broadcasting that the data on the IP network are sent to all ONU, uplink traffic is controlled all ONU by OLT, the same moment only allows specific ONU transmission data, by the up flow of time-sharing multiplex control, avoid the data collision of uplink traffic.
Gigabit Passive Optical Network (Giga-bit Passive Optical Network, abbreviation GPON) technical standard is up-to-date PON technical standard, in the technical standard of the GPON of International Telecommunications Union (ITU-T) corresponding G984.1, G982.2, G984.3, G984.4 series.The protocol stack structure of GPON standard begins to be divided into the GPON physical medium by physical layer and relies on (GPON Physical Media DependentLayer, being called for short GPM) layer, GPON transmission concentrate (CPON Transmission ConvergenceLayer is called for short GTC) layer.The GTC layer of GPON is responsible for user data is encapsulated, by OLT and ONU negotiation to service transmission channels, business datum such as ethernet frame, after the encapsulation by the GTC layer, transmission by the GPM layer is sent on the optical physics medium, submit the data that receive to the GTC layer at receiving terminal GPM layer equally, the GTC layer removes encapsulation, submits to the upper strata to handle.The transmission of business datum is divided into unicast transmission mode and multicast transmission mode, and the unicast transmission mode is point-to-point transmission, and the multicast transmission mode is the transmission of point-to-multipoint.Because the transmission of the support data downstream point-to-multipoint that the PON system is natural, the GPON system is supporting multicast service, and is typical in the IP multicast service by the ethernet frame carrying, has natural advantage.
The GPON system supports multicast service to realize by following mode:
ONU can register on OLT when giving electricity, and obtaining OLT is the unique identification ONU-ID of its distribution, and the message of this ONU transmission all can carry this sign afterwards.The Internet Group Management Protocol that OLT listen for user ONU sends on IP network (Internet Group Management Protocol, be called for short IGMP) message, know that by the IGMP protocol message user expects the multicast group (MulticastGroup) that adds, the multicast address of the multicast group that message was subordinate to is determined by upper-layer protocol, and be present in the message, OLT can be known this multicast address by resolving this message.
Go up the user for OLT and expect the particular multicast group that adds for the first time, OLT distributes the multicast transmission channel at specific multicast group, and safeguards the relation of multicast group and multicast transmission passage.The OLT notice sends the ONU of IGMP protocol massages by this transmission channel receiving multicast data.Continue the ONU that expectation adds this multicast group for the back, OLT notifies ONU to pass through this multicast transmission passage receiving multicast data.If ONU sends IGMP leave message notice OLT when leaving some multicast group, OLT need know whether also have other ONU to need the receiving group flow in this multicast group.Therefore, OLT can't just cut off flux of multicast at once, but can send the message of designated multicast group polling to all ONU, according to whether receive inquiry response judge other ONU of being connected with this OLT port whether needs continue to receive the flow of this multicast group.OLT does not only receive the response of any one ONU to the designated groups query messages in " last membership query counting (LastMember Query Count) the last membership query of the * time interval (Last Member Query Interval) " of IGMP agreement regulation in the time, just stop forwarding flux of multicast, this stand-by period defaults to 2 seconds.
Therefore, the GPON system exists the problem that multicast leaves time delay, be that the last all ONU of OLT leave this multicast group, wait for designated groups query response message overtime (this time-out time defaults to 2 seconds) before at OLT, OLT still needs to continue forwarding multicasting stream on the OLT port.The GPON system descending is a bandwidth sharing, if the specification of downlink bandwidth is to support N channel forwarding multicasting flow simultaneously, and the access of having transmitted N channel at present, the user is when switching multicast channel, because the channel that leaves just stops forwarding flow after 2 seconds, cause new channel not have bandwidth to utilize in 2 seconds, on user's terminal, just show channel and switch and will wait for a period of time, this compared with the switching time of simulated television, made the user beyond affordability.Simultaneously, these flux of multicast that do not have ONU to receive have also been wasted the downlink bandwidth of GPON system.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, propose a kind of in passive optical network optical network unit leave the method for multicast group, thereby eliminate the time delay of leaving of GPON multicast, improve the utilance of multicast downlink bandwidth.
For achieving the above object, the present invention proposes a kind of in passive optical network optical network unit leave the method for multicast group, step 10, optical line terminal receive the adding multicast group message that optical network unit sends, resolve the multicast group information that this message carries, judge whether the multicast group that optical network unit will add is a new multicast group, if set up and store the corresponding relation of the multicast address of the information of described optical network unit and described multicast group; Otherwise, the information of described optical network unit is joined in the corresponding relation of multicast group of its adding; When an optical network unit leaves multicast group, carry out following steps:
Step 11, optical network unit send the message that leaves multicast group to described optical line terminal;
After step 12, described optical line terminal receive the described message that leaves multicast group, resolve the multicast group information that this message carries, obtain the information of this optical network unit, the information of the described optical network unit of deletion in described corresponding relation, and whether the information of judging optical network unit in the described corresponding relation is empty, if have, then continue to intercept message; Otherwise execution in step 13;
Step 13, stop forwarding the multicast packet of described multicast group.
The concrete following steps of carrying out of described step 10:
Step 100, optical network unit send a message that adds multicast group to optical line terminal;
After step 101, described optical line terminal receive described message, judge whether the multicast group that described optical network unit will add is a new multicast group, if then execution in step 102; Otherwise execution in step 103;
The multicast optical network unit table that it is index that step 102, described optical line terminal are set up a multicast address with described multicast group, the unique identification of the described optical network unit of adding in table;
Step 103, the multicast address that the unique identification of described optical network unit is added with described multicast group are in the multicast optical network unit table of index.
Described step 101 is specially:
After described optical line terminal receives described message, resolve the multicast group information that described message carries, the multicast address that comprises this multicast group, and from the gigabit passive optical network protocol layer that encapsulates this message, to send the unique identification of the optical network unit of this message, judge whether described multicast group is a new multicast group, if then execution in step 102; Otherwise execution in step 103.
Described step 101 is specially:
Optical line terminal is intercepted the Internet Group Management Protocol message of the internet protocol version four that obtains an optical network unit adding multicast group or the Multicast Listener Discovery protocol massages of IPv 6 by data.
Described step 12 is specially:
Optical line terminal is intercepted by data and is obtained an optical network unit and leave the Internet Group Management Protocol message of internet protocol version four of multicast group or the Multicast Listener Discovery protocol massages of IPv 6.
Described step 12 is specially:
Step 20, described optical line terminal are resolved the multicast group information that described message carries, and obtain the unique identification of the optical network unit of the described message of transmission from the gigabit passive optical network protocol layer that encapsulates described message;
Step 21, described optical line terminal are index with the multicast address, the unique identification of the described optical network unit of deletion in described multicast optical network unit table;
Step 23, described optical line terminal judge whether the unique identification of the optical network unit in the described multicast optical network unit table is empty, if then continue to intercept message; Otherwise execution in step 13.
The present invention is by safeguarding multicast group and being under the jurisdiction of corresponding relation between the ONU of this multicast group, in case multicast group is empty, delete the multicast transmission passage that it takies immediately, and stop multicast forwarding, thereby solved when all ONU leave multicast group under OLT in the GPON system, also exist flux of multicast to continue the problem of transmitting on the line, eliminated the time delay of leaving of GPON multicast, improved the utilance of multicast downlink bandwidth.
Fig. 1 is the structure chart of PON networking in the background technology of the present invention;
Fig. 2 is the structure chart of multicast ONU table in the embodiments of the invention;
Description of drawings
Fig. 3 is the flow chart of embodiments of the invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The present invention is the information that the multicast group of its management safeguard to need receives all ONU of these multicast traffics at OLT, when not having ONU to receive the flow of certain multicast group, stops at once the traffic forwarding of this multicast group.
Embodiment
As shown in Figure 3, leave the flow chart of the embodiment of multicast group method for the present invention's optical network unit in passive optical network, in the present embodiment, foundation is the table of index with the multicast address of multicast group, represents multicast group and the corresponding relation that is under the jurisdiction of the ONU of this multicast group with this, and this table is called multicast ONU table, this list structure as shown in Figure 2, wherein, ONU information can be ONU unique identification ONU-ID by the OLT distribution in the process of registration, specifically carries out following steps:
The IGMP message of the IPV4 that step 101, OLT real-time sense ONU send or the Multicast Listener Discovery protocol massages of IPV6;
Step 102, OLT judge which kind of type of message its message that listens to is, have corresponding data bit to identify the type of this message in the middle of the packet header of message, and OLT just judges according to this data bit that if for adding the message of multicast group, then execution in step 103; If for leaving the message of a certain multicast group, then execution in step 107;
Step 103, optical line terminal are resolved the multicast group information that this message carries, and comprise the multicast address of this multicast group, and obtain the unique identification ONU-ID of the ONU of this message of transmission from the passive optical network protocol layer that encapsulates described message;
Step 104, optical line terminal are index with this multicast address, by inquiring about the multicast ONU table of himself safeguarding, judge whether the multicast group that described optical network unit will add is a new multicast group, be self whether to have safeguarded with this multicast address to be the multicast ONU table of index, if then execution in step 105; Otherwise execution in step 106;
The multicast ONU table that it is index that step 105, optical line terminal are set up a multicast address with described multicast group is safeguarded the multicast address of multicast group and the corresponding relation of the ONU-ID of the ONU that adds this multicast group in the table;
Step 106, the unique identification ONU-ID of described optical network unit is joined in the multicast ONU table of multicast group, and continue to intercept IGMP message or Multicast Listener Discovery protocol massages;
Step 107, optical line terminal are resolved the multicast group information that this message carries, and obtain the unique identification ONU-ID of the optical network unit of this message of transmission from the gigabit passive optical network protocol layer that encapsulates this message;
Step 108, optical line terminal are index with the multicast address, the unique identification ONU-ID of the described optical network unit of deletion in multicast ONU table;
Step 109, optical line terminal judge whether the unique identification ONU-ID of the optical network unit in the multicast ONU table is empty, if be not empty, then continues to intercept IGMP message or Multicast Listener Discovery protocol massages; Otherwise execution in step 110;
Step 110, stop forwarding the multicast packet of this multicast group, and continue to intercept IGMP message or Multicast Listener Discovery protocol massages.
In the present invention, owing to safeguarded multicast ONU table, make multicast group obtain corresponding with the ONU that is under the jurisdiction of this multicast group, in case a certain ONU withdraws from the multicast group of its ownership, then in showing, deletes multicast ONU the information of this ONU, and when this table is sky, delete the multicast transmission passage of this multicast group immediately, and stop multicast forwarding, thereby avoided in the prior art, because OLT does not know multicast group and the corresponding relation that is under the jurisdiction of the ONU of this multicast group, when a certain ONU withdraws from multicast group, need send broadcast query message to all ONU, and the problem of time-delay that causes and occupied bandwidth.
Present embodiment leaves the method for multicast group for optical network unit in Gbit passive optical network system, in addition, the present invention is applicable to that all support descending shared link and the PON system of up isolation, because if up link is shared, then when an ONU leaves multicast group, other ONU can be known this incident, and add this multicast group, thereby can't safeguard multicast ONU table, and the applied environment of this method and bandwidth are irrelevant, therefore, all applicable this method of the PON system of up isolation as long as satisfy descending shared link.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (6)
- One kind in passive optical network optical network unit leave the method for multicast group, it is characterized in that:Step 10, optical line terminal receive the adding multicast group message that optical network unit sends, resolve the multicast group information that this message carries, judge whether the multicast group that optical network unit will add is a new multicast group, if set up and store the corresponding relation of the multicast address of the unique identification of described optical network unit and described multicast group; Otherwise, the unique identification of described optical network unit is joined in the corresponding relation of multicast group of its adding;When optical network unit leaves multicast group, carry out following steps:Step 11, described optical network unit send the message that leaves multicast group to described optical line terminal;After step 12, described optical line terminal receive the described message that leaves multicast group, resolve the multicast group information that this message carries, obtain the unique identification of this optical network unit, the unique identification of the described optical network unit of deletion in described corresponding relation, and whether the unique identification of judging optical network unit in the described corresponding relation is empty, if be not empty, then continue to intercept message; Otherwise execution in step 13;Step 13, stop forwarding the multicast packet of described multicast group.
- 2. according to claim 1 in passive optical network optical network unit leave the method for multicast group, it is characterized in that: the concrete following steps of carrying out of described step 10:Step 100, described optical network unit send a message that adds multicast group to described optical line terminal;After step 101, described optical line terminal receive described message, judge whether the multicast group that described optical network unit will add is a new multicast group, if then execution in step 102; Otherwise execution in step 103;The multicast optical network unit table that it is index that step 102, described optical line terminal are set up a multicast address with described multicast group, the unique identification of the described optical network unit of adding in table;Step 103, the multicast address that the unique identification of described optical network unit is added with described multicast group are in the multicast optical network unit table of index.
- 3. according to claim 2 in passive optical network optical network unit leave the method for multicast group, it is characterized in that: described step 101 is specially:After described optical line terminal receives described message, resolve the multicast group information that described message carries, the multicast address that comprises this multicast group, and from the gigabit passive optical network protocol layer that encapsulates described message, to send the unique identification of the optical network unit of this message, judge whether described multicast group is a new multicast group, if then execution in step 102; Otherwise execution in step 103.
- 4. according to claim 2 in passive optical network optical network unit leave the method for multicast group, it is characterized in that: described step 101 is specially:Optical line terminal is intercepted the Internet Group Management Protocol message of the internet protocol version four that obtains an optical network unit adding multicast group or the Multicast Listener Discovery protocol massages of IPv 6 by data.
- According to claim 1,2 or 3 described in passive optical network optical network unit leave the method for multicast group, it is characterized in that: described step 12 is specially:Optical line terminal is intercepted by data and is obtained an optical network unit and leave the Internet Group Management Protocol message of internet protocol version four of multicast group or the Multicast Listener Discovery protocol massages of IPv 6.
- According to claim 1,2 or 3 described in passive optical network optical network unit leave the method for multicast group, it is characterized in that: described step 12 is specially:Step 20, described optical line terminal are resolved the multicast group information that described message carries, and obtain the unique identification of the optical network unit of the described message of transmission from the gigabit passive optical network protocol layer that encapsulates described message;Step 21, described optical line terminal are index with the multicast address, the unique identification of the described optical network unit of deletion in described multicast optical network unit table;Step 23, described optical line terminal judge whether the unique identification of the optical network unit in the described multicast optical network unit table is empty, if be not empty, then continues to receive message; Otherwise execution in step 13.
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| CN101534203B (en) * | 2008-03-13 | 2012-11-07 | 华为技术有限公司 | Method, equipment and system for multicast control |
| CN101729932A (en) * | 2008-10-20 | 2010-06-09 | 华为技术有限公司 | Multicast admission control method of optical fiber access network, apparatus and system |
| CN102651693B (en) * | 2012-03-30 | 2016-03-02 | 上海斐讯数据通信技术有限公司 | Two stack multi-cast system and two stack method of multicasting thereof |
| CN104126293B (en) * | 2013-01-22 | 2017-07-14 | 华为技术有限公司 | Realize the method, apparatus and system of multicast |
| CN106161070B (en) * | 2015-04-17 | 2021-02-02 | 中兴通讯股份有限公司 | xPON multicast service monitoring method and device and OLT equipment |
| CN115766565A (en) * | 2022-12-28 | 2023-03-07 | 深圳市鸿升光通讯设备有限公司 | Multicast group maintenance method based on MAC address |
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