CN102340708A - Method for two-layer multicast in EPON (Ethernet Passive Optical Network) system - Google Patents
Method for two-layer multicast in EPON (Ethernet Passive Optical Network) system Download PDFInfo
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- CN102340708A CN102340708A CN2010102335995A CN201010233599A CN102340708A CN 102340708 A CN102340708 A CN 102340708A CN 2010102335995 A CN2010102335995 A CN 2010102335995A CN 201010233599 A CN201010233599 A CN 201010233599A CN 102340708 A CN102340708 A CN 102340708A
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Abstract
The invention discloses a method for two-layer multicast in an EPON (Ethernet Passive Optical Network) system, which comprises the following steps of: firstly, setting a plurality of configurable multicast logical port identifications for receiving multicast data at user side equipment of the EPON system; secondly, allocating one multicast logical port identification for each multicast group by using local side equipment of the EPON system for transmitting a multicast packet; thirdly, configuring the multicast logical port identifications to all user side equipment in a multicast group by using the EPON system; and fourthly, before transmitting the multicast packet, setting the multicast logical port identification in the multicast packet and extracting the multicast packet according to the multicast logical port identifications by the user side equipment. According to the method disclosed by the invention, the utilization efficiency of a downstream bandwidth of the system can be effectively improved. Meanwhile, the method lays a foundation for two-layer encryption of multicast services and other technologies.
Description
Technical field
The present invention relates to the technology of two layers of multicast in a kind of EPON system.
Background technology
EPON EPON (Ethernet Passive OpticalNetworks) based on Ethernet is a point-to-point configuration.In the EPON system, a local side apparatus connects a plurality of ustomer premises access equipment (see figure 1)s through tree-structure mode, and local side apparatus is a down direction to the communication of ustomer premises access equipment, and ustomer premises access equipment is a up direction to the communication of local side apparatus.At down direction, the local side apparatus broadcast data packet, the purpose ustomer premises access equipment extracts packet selectively.On the down direction, some packet that local side apparatus sends requires a plurality of ustomer premises access equipments to extract, and is referred to as multicast.If this transmission and extraction realize in data link layer, then are referred to as two layers of multicast.
Summary of the invention
The technical problem that the present invention will solve provides the method for two layers of multicast in a kind of EPON system, and it can improve system descending bandwidth usage efficient.
For solving the problems of the technologies described above, the method for two layers of multicast in the EPON of the present invention system, for:
1) ustomer premises access equipment of said EPON system has configurable a plurality of multicast logic port sign that is used to receive multi-case data;
2) local side apparatus of said EPON system distributes a multicast logic port sign for each multi-broadcast group, is used to send multicast packet;
3) said EPON system is configured to said multicast logic port sign all ustomer premises access equipments of said multi-broadcast group;
4) before the transmission multicast packet, said multicast logic port sign is arranged in the multicast packet, said ustomer premises access equipment identifies with said multicast logic port and extracts said multicast packet.
Two layers of multicasting technology of the present invention; Be employed in ustomer premises access equipment configurable a plurality of multicast logic port sign that is used to accept multi-case data is set; And local side apparatus distributes a multicast logic port sign that is used to send multicast packet for each multi-broadcast group; The EPON network system is configured to this multicast logic port sign all members' of this multi-broadcast group ustomer premises access equipment again, and ustomer premises access equipment extracts multicast packet with this address.Adopt two layers of multicasting technology of the present invention, local side apparatus need not to be many parts of copies of descending multicast packet transmission that only need a copy of the descending multicast packet of transmission, all this multi-broadcast group Member Users hold equipment can receive this copy.Two layers of multicasting technology of the present invention can effectively improve the utilization ratio of system descending bandwidth.Simultaneously, the technology such as two infill layers for multicast service provide the basis.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the network topology sketch map of EPON system;
Fig. 2 is an ethernet frame lead code instance in the EPON system.
Embodiment
In a specific embodiment of two layers of multicasting technology of the present invention, for:
1) ustomer premises access equipment has a multicast logic port sign and a configurable a plurality of multicast logic port sign that is used to accept multi-case data that is used to send upstream data and the descending unicast data of reception;
2) local side apparatus distributes a multicast logic port sign for each multi-broadcast group, is used to send the bag of this multicast;
3) network system is configured to this multicast logic port sign all members' of this multi-broadcast group ustomer premises access equipment;
4) before the transmission multicast packet, multicast logic port sign is set in multicast packet, ustomer premises access equipment extracts multicast packet with this multicast logic port sign.
Give an example; 10 same programs of people's program request; So just build a multi-broadcast group; This multi-broadcast group comprises this 10 members, and local side apparatus distributes a multicast logic port sign for this multi-broadcast group, and network system is configured to this multicast logic port sign all members' of this multi-broadcast group ustomer premises access equipment (being these 10 members' ustomer premises access equipment).This programme content is very big, can in a lot of multicast packet, send, and all has this multicast logic port sign in each multicast packet.10 members' ustomer premises access equipment extracts multicast packet with this multicast logic port sign.
Adopt this technical scheme, local side apparatus need not to be many parts of copies of descending multicast packet transmission that only need a copy of the descending multicast packet of transmission, all this multi-broadcast group Member Users hold equipment can receive this copy.And this multicasting technology is to realize in data link layer (promptly two layers, Lay 2), so this technology is referred to as two layers and broadcasts technology.
To be local side apparatus be arranged on the multicast logic port sign of multi-broadcast group in the lead code (Preamble) of ethernet frame (multicast packet), so the format and content of ethernet frame itself is had no influence for instantiation.In the EPON system, before each ethernet frame of transmission, need first transmission preamble sign indicating number (Preamble).A concrete EPON standard definition is as shown in Figure 2 based on the lead code form of EPON (EPON, Ethernet Passive Optical Networks) the transmission ethernet frame of Ethernet, and this preamble length is 8 bytes, and value defines as follows:
● first byte, value are 0x55;
● second byte, value are 0x55;
● the 3rd byte: SLD (Start LLID Delimiter), value is 0xD5;
● the 4th byte and the 5th byte: reserve (Reserved), default value is 0x5555.This territory can be used for encryption and waits technique extension to use;
● the 6th byte and the 7th byte: LLID territory (Logical Link Identifier).The 6th byte bit [7] is that mode bit bit [6:0] is LLID [15:8], and the 7th byte is LLID [7:0].The LLID territory is used for identifying user apparatus logic port.0x0000 is used for identifying unique user end equipment clean culture logic port or certain multi-broadcast group logic port to certain value in the 0x7F00 span.0x7FFF and 0x7FFE are broadcast identifier.0x7F00 is that later function is reserved to 0x7FFD.
● CRC8: calculate the CRC check of last byte (totally 5 bytes) from SLD to LLID, account form is referring to IEEE 802.3-2005Clause65.1.3.2.3.
Local side apparatus is if will send a multicast ethernet frame; And the ustomer premises access equipment of hoping all this multi-broadcast group members is when all receiving this ethernet frame; The LLID territory that the lead code of this ethernet frame is set is this multicast logic port sign, descending transmission lead code and this ethernet frame behind the calculating CRC8.
And ustomer premises access equipment is done as judging when receiving a downlink Ethernet frame:
(1) if the CRC8 verification is correct in the lead code of this ethernet frame, mode bit is 0, and the LLID territory is the clean culture logic port sign of oneself, then receives this ethernet frame;
(2) if the CRC8 verification is correct in the lead code of this ethernet frame, mode bit is 0, and the multicast logic port sign of LLID territory for having disposed, then receives this ethernet frame;
(3) if the CRC8 verification is correct in the lead code of this ethernet frame, mode bit is 1, and the LLID territory is 0xFFFF or 0x7FFE, then receives this ethernet frame.
Adopt method of the present invention can effectively improve the utilization ratio of system descending bandwidth.Simultaneously, the technology such as two infill layers for multicast service provide the basis.
Claims (4)
1. the method for two layers of multicast in the EPON system is characterized in that:
1) ustomer premises access equipment in said EPON system has configurable a plurality of multicast logic port sign that is used to receive multi-case data;
2) local side apparatus of said EPON system distributes a multicast logic port sign for each multi-broadcast group, is used to send multicast packet;
3) said EPON system is configured to said multicast logic port sign all ustomer premises access equipments of said multi-broadcast group;
4) before the transmission multicast packet, said multicast logic port sign is arranged in the multicast packet, said ustomer premises access equipment identifies with said multicast logic port and extracts said multicast packet.
2. according to the described method of claim 1, it is characterized in that: said multicast logic port sign is arranged in the ethernet frame lead code that needs the multicast transmission.
3. according to the described method of claim 1, it is characterized in that: said multicast logic port sign is arranged on the LLID territory of the ethernet frame lead code that needs the multicast transmission.
4. according to each described method in the claim 1 to 3, it is characterized in that: said ustomer premises access equipment also has one and is used to send upstream data and the clean culture logic port sign that receives descending unicast data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102335995A CN102340708A (en) | 2010-07-22 | 2010-07-22 | Method for two-layer multicast in EPON (Ethernet Passive Optical Network) system |
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| CN2010102335995A CN102340708A (en) | 2010-07-22 | 2010-07-22 | Method for two-layer multicast in EPON (Ethernet Passive Optical Network) system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871489A (en) * | 2012-12-17 | 2015-08-26 | 高通股份有限公司 | Multicast traffic bridging |
| CN106550291A (en) * | 2015-09-23 | 2017-03-29 | 中兴通讯股份有限公司 | The transmission of resource allocation information, data distributing method and device |
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| CN1521662A (en) * | 2003-01-30 | 2004-08-18 | 烽火通信科技股份有限公司 | Method and apparatus for realizing Ethernet passive optical network system dynamic filtration data base |
| WO2006062676A2 (en) * | 2004-12-11 | 2006-06-15 | Alcatel Lucent | Deriving passive optical network port identifiers |
| CN1864433A (en) * | 2003-11-06 | 2006-11-15 | 泰克诺沃斯公司 | Method and apparatus for bandwidth-efficient multicast in Ethernet passive optical networks |
| CN101621461A (en) * | 2008-06-30 | 2010-01-06 | 中兴通讯股份有限公司 | Downstream data transmission method of passive optical network system |
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2010
- 2010-07-22 CN CN2010102335995A patent/CN102340708A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521662A (en) * | 2003-01-30 | 2004-08-18 | 烽火通信科技股份有限公司 | Method and apparatus for realizing Ethernet passive optical network system dynamic filtration data base |
| CN1864433A (en) * | 2003-11-06 | 2006-11-15 | 泰克诺沃斯公司 | Method and apparatus for bandwidth-efficient multicast in Ethernet passive optical networks |
| WO2006062676A2 (en) * | 2004-12-11 | 2006-06-15 | Alcatel Lucent | Deriving passive optical network port identifiers |
| CN101621461A (en) * | 2008-06-30 | 2010-01-06 | 中兴通讯股份有限公司 | Downstream data transmission method of passive optical network system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871489A (en) * | 2012-12-17 | 2015-08-26 | 高通股份有限公司 | Multicast traffic bridging |
| CN106550291A (en) * | 2015-09-23 | 2017-03-29 | 中兴通讯股份有限公司 | The transmission of resource allocation information, data distributing method and device |
| WO2017050036A1 (en) * | 2015-09-23 | 2017-03-30 | 中兴通讯股份有限公司 | Resource allocation information transmission and data distribution method and device |
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Application publication date: 20120201 |