CN101257420A - Point-to-point protocol accessing method, system as well as access node equipment - Google Patents
Point-to-point protocol accessing method, system as well as access node equipment Download PDFInfo
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- CN101257420A CN101257420A CN 200710085357 CN200710085357A CN101257420A CN 101257420 A CN101257420 A CN 101257420A CN 200710085357 CN200710085357 CN 200710085357 CN 200710085357 A CN200710085357 A CN 200710085357A CN 101257420 A CN101257420 A CN 101257420A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/168—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] specially adapted for link layer protocols, e.g. asynchronous transfer mode [ATM], synchronous optical network [SONET] or point-to-point protocol [PPP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
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Abstract
The invention relates to an access technology art and provides a point-point protocol (PPP) access method, system and a node access equipment. The access method includes the steps that: the node access equipment receives the PPP access message and judges whether the PPP access message is a protocol message or a data message; when the PPP access message is a protocol message, transmits the protocol message into an access controller and performs access management onto a subscriber by the access controller, if the access controller allows subscriber access, the node access equipment sets and maintains a data forwarding table; and if the PPP access message is a data message, the node access equipment forwards the data message based on the data forwarding table. According to the technology scheme of the invention, separation of the control and bearing in the point-point protocol access process is achieved, which is beneficial for the expansion and updating of the network.
Description
Technical field
The present invention relates to the broadband access network technical field, relate in particular to a kind of point-to-point protocol (PPP, Point toPoint Protocol) cut-in method, system and access node apparatus.
Background technology
Ppp protocol is the data link layer protocol in the ICP/IP protocol stack, provides a kind of mode of standard to transmit the datagram of a plurality of network layer protocols on point-to-point link.Ppp protocol has the Network Control Protocol (NCP that supports the heterogeneous networks level, Network Control Protocol) as Internet protocol control protocol (IPCP, Internet Protocol Control Protocol) and internet packet exchange control protocol (IPXCP, Internet work Packet Exchange Control Protocol), LCP (LCP, LinkControl Protocol) and checking family's agreement such as challenge handshake authentication protocol (CHAP, ChallengeHandshake Authentication Protocol), password authentication protocol (PAP, PasswordAuthentication Protocol).Wherein, NCP is mainly used to consult the form and the type of data packets for transmission on the link, and LCP is mainly used to set up, removes and monitoring PPP information link, and checking family agreement is mainly used to carry out authentication to connecting the user, the PPP that prevents the disabled user connects, and guarantees the safety of network.Figure 1 shows that the frame format of ppp protocol, wherein, protocol domain is used for the protocol type of identifying information territory field encapsulation, the protocol type of mainly using at present has LCP, NCP and common IP agreement, and their corresponding protocol domain fields are respectively 0xC021,0x8021,0x0021, and the information of back comprises different message contents according to different agreements.
Along with development of internet technology, broadband access has become a kind of leading user mode access.Common broadband access method has ADSL (Asymmetric Digital Subscriber Line) (ADSL, Asymmetrical DigitalSubscriber Loop), very-high-bit-rate digital subscriber loop (VDSL, Very-high-bit-rate DigtalSubscriber Loop), Ethernet, EPON (PON, Passive Optical Network).According to the needs of operator's operation, these access waies need broadband dialing and the process that authenticates.The main mode of the dialing of current broadband and authentication has asynchronous transfer mode (ATM, Asynchronous Transfer Mode) carrying PPP (PPPoA, PPP over ATM) and Ethernet bearing PPP (PPPoE, PPP over Ethernet).Wherein, PPPoA is based on the PPP of atm adaptation layer 5 (ATMAAL5, ATM Adaptation Layer 5), and PPPoA uses the bag of atm adaptation layer 5 assembling PPP encapsulation.It is point-to-point relations that ppp protocol requires the both sides that communicate, and can't directly apply to the Ethernet of broadcast-type, and PPPoE has solved this problem.By the PPPoE agreement, a plurality of main frames in a shared Ethernet can pass through one or more simple bridge joint access devices, carry out a plurality of PPP sessions with remote access server.PPPoE not only provides a kind of broadband access means for the user who uses bridged ethernet to insert, access control and the charging that can also provide convenience simultaneously.The workflow of PPPoE agreement comprises to be found and two stages of session.A main frame is looked on the bright side of things when beginning a PPP session, it at first will carry out the medium access control (MAC that the other side is discerned in a discovery procedure, Medium Access Control) address, set up then a unique PPP session identification (ID, Identification).After the pppoe session stage began, main frame and access server transmitted PPP information according to ppp protocol, carried out every negotiation and the transfer of data of PPP.What PPPoA and PPPoE provided all is being connected of a kind of point-to-point, and difference is that PPPoA is carried on the atm network, and PPPoE is carried on the ethernet network, adapts to atm standard and ethernet standard respectively.
Because ppp protocol is a kind of point-to-point connection of standard, and PPPoX (comprising PPPoA and PPPoE) provides also is a kind of point-to-point connection, protocol massages and user data message are controlled between 2 of agreement and are carried and bundle, in carrying out the invention process, the inventor finds that there are the following problems at least in the prior art: every technology innovation of bearer network all needs to support ppp protocol, and the innovation of PPP access technology also will adapt to bearer network, can cause the increase of network operation cost like this, be unfavorable for the expansion and upgrading of network, along with the evolution of network, control is separated into inevitable requirement with carrying.Because PPPoX provides the connection of point-to-point, the access server in the network needs a large amount of PPP session of termination as an end of network side in the point-to-point connection, transmits a large amount of IP packets, when heavy traffic, becomes the bottleneck of network performance probably.
Summary of the invention
Embodiment of the invention technical problem to be solved provides a kind of PPP access authentication method, system and access node apparatus, with separating of realizing controlling and carrying in the PPP access authentication.
For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:
The embodiment of the invention provides a kind of point-to-point protocol cut-in method, and this method comprises:
The point-to-point protocol that access node apparatus receives from the user inserts message, judge that it is protocol massages or data message that described point-to-point protocol inserts message, if be protocol massages, then described protocol massages is sent to access controller, and the user is carried out access-in management by described access controller, if access controller allows the user to insert, then transmit by access node apparatus foundation and service data; If be data message, then according to described data forwarding table described data message is transmitted by access node apparatus.
The embodiment of the invention provides a kind of point-to-point protocol connecting system, and this system comprises access node apparatus, access controller, wherein:
Access node apparatus, the point-to-point protocol that is used to receive from the user inserts message, judge that it is protocol massages or data message that described point-to-point protocol inserts message, and when described point-to-point protocol access message is protocol massages, sending it to access controller handles, when the message that the permission that receives the access controller transmission inserts, establishment and service data are transmitted; When described point-to-point protocol access message is data message, it is transmitted according to described data forwarding table;
Access controller is used for according to the protocol massages that receives the user being carried out access-in management.
The embodiment of the invention also provides a kind of access node apparatus, and this access node apparatus comprises that message receives recognition unit, packet sending unit, memory cell, wherein:
Message receives recognition unit, and being used to receive point-to-point protocol massages and discerning the described point-to-point protocol message that receives is protocol massages or data message;
Packet sending unit receives the protocol massages that recognition unit receives with message and is forwarded to first destination address, according to the data forwarding table of storing in the memory cell message is received data message forwarding to the second destination address that recognition unit receives;
Memory cell is used to store the data forwarding table.
As can be seen from the above technical solutions, by access node apparatus the PPPoX from the user being inserted message judges, isolate data message and protocol massages, and data message transmitted, and carry out access control and management according to protocol massages by access controller, thus finished separating of controlling and carry in the PPP access, make the innovation of PPP access control technology and the evolution of bearer network be independent of each other, be beneficial to the expansion and upgrading of network, also saved the network operation cost simultaneously.
Simultaneously, be responsible for the user is carried out access control and management by access controller, and transmit packet by access node apparatus, network load is shared by the two, thereby improved the utilization ratio of equipment, the a certain facility load of having avoided network is overweight and influence the operation of whole network, has reduced the performance requirement to the network equipment.
Description of drawings
Fig. 1 is a PPP frame format schematic diagram in the prior art;
Fig. 2 is the access process figure of the preferred embodiment of PPP cut-in method of the present invention;
Fig. 3 is the structural representation of PPP connecting system of the present invention preferred embodiment;
Fig. 4 is the structural representation of access node apparatus preferred embodiment of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
At first PPP cut-in method provided by the invention is described, with reference to Fig. 2 for an embodiment.
Step 21: the PPP that access node apparatus (AN, Access Node) receives from the user inserts message;
At first send PPP by subscriber equipment and insert message, request is set up PPP and is connected.PPP connects and can be initiated by subscriber's main station, also can be initiated by residence gateway (RG, Residential Gateway).PPP access message comprises that according to the difference of bearing mode PPPoA inserts message and PPPoE inserts message, generally speaking, PPPoA is used for routing mode, and access authentication procedure is finished by RG, and PPPoE works in the bridge joint mode, initiates the PPPoE request by subscriber's main station or RG.Therefore the concrete equipment of user side can be subscriber's main station, also can be RG.
Step 22:AN judges that it is protocol massages or data message that described PPPoX inserts message, if protocol massages, then execution in step 23; If be data message, then execution in step 27;
AN can judge type of message according to the protocol domain of PPP frame, is 0x8021 as the protocol domain field, then is the NCP protocol massages, is 0x0021 as protocol fields, then is the IP datagram literary composition.
Step 23: described protocol massages is sent to access controller (AC, Access Controller), and the user is carried out access-in management, comprise that access link is consulted, user's access address distributes, the access authentication mandate by AC;
In the process of access-in management, AC handles accordingly according to different protocol types.As receive for the LCP protocol massages, then hold consultation with the user, carry out foundation, maintenance or the termination of data link.If that receive is authentication family's agreement such as PAP or CHAP, then this protocol massages is forwarded to Authorization, Authentication and Accounting (AAA, Authentication, Authorization and Accounting) server carries out authentication to the user, in case disabled user's PPP connects.If desired, the message that also aaa server should be returned at first is converted to the PPPoX form.AN will receive and directly be forwarded to the user when AC mails to user's protocol massages.
The realization of AAA can be adopted RADIUS (Remote Authentication Dial In User Service, the remote customer dialing authentication system), RADIUS be a kind of between NAS (Network Access Server, network access server) is as BRAS (Broadband Remote Access Server) and shared certificate server the agreement of certified transmission, mandate and configuration information.RADIUS uses UDP (UserDatagram Protocol, User Datagram Protoco (UDP)) as its host-host protocol.RADIUS also is responsible for transmitting the charge information between network access server and shared accounting server in addition.In the present embodiment, AC can be used as NAS equipment such as BRAS.
Step 24:AN judges whether to allow this user to insert, and if not, then execution in step 25; If then execution in step 26;
Can be by user identity being verified whether by judging whether to allow the user to insert.
Step 25: close the dismounting link, termination PPP session;
Step 26:AN sets up and service data is transmitted;
AN can or survey and obtain the PPP signaling information of user and AC by monitoring, and then obtains needed information or parameter.Also can wait and control AN by additional control protocol such as SNMP (SimpleNetwork Management Protocol, Simple Network Management Protocol), ANCP (Access NetworkControl Protocol, access network control protocol) by AC.Like this, an administration agent is just arranged in AN, it is used for to AC solicited message and action.
Because in the PPP point-to-point communication, there is the certain time sequence relation in each stage, therefore, if not allowing the user to insert as the authentication to the user does not finish, then the data message that transmits of this user just can't be delivered to the purpose network, so can be provided with that AN can only transmit the ppp protocol message at the port of user side under the default situations, when authentication is passed through, just can data message transmission, be similar to 802.1X.
AN sets up according to the PPP information of being obtained and service data is transmitted.
Transmitting wherein one as data can be: (port [containing logic port] sign, user Mac, the PPP session identification)＜-(user MAC, IP address, user gateway IP address), AN transmits processing according to this table to the PPP information message, comprise the conversion of message format and message sent to destination address, message format conversion as: IPoE to PPPoE change or PPPoE to the conversion of PPPoA.
Above described if the PPPoE situation, if AN is the target MAC (Media Access Control) address that can directly obtain data message under three layers of situation in this locality, if AN is a two layer case, as AN is switch, AN is by ARP (Address Resolution Protocol, address resolution protocol) MAC Address of obtaining user gateway IP correspondence is as purpose MAC, and source MAC uses the MAC Address that inserts the user.
Step 27:AN judges that whether user's access is through allowing, if then execution in step 28; If not, execution in step 29 then;
As the data forwarding table that AN can be set up by finding step 26, whether if having corresponding session id and destination address to judge in this table, if having, then explanation allows the user to insert.The port status that an expression user inserts also can be set in this table, and under the default situations, this port is for closing, and when allowing the user to insert, this port allows data message transmission for opening.
Step 28:AN transmits data message according to the data forwarding table that institute sets up and safeguards;
In the PPP point-to-point communication, consult to be divided into 5 stages, that is: (Network) stage and end (Terminate) stage are consulted in off-line (Dead) stage, link establishment phase (Establish), authentication (Authenticate) stage, network control.Different phase is carried out the negotiation of different agreement, after the protocol negotiation of front is obtained a result, changes the negotiation of next stage agreement again over to.Therefore, generally speaking, after the checking that allows user's access for example user identity to be carried out was passed through, the datagram literary talent that this user sends can be forwarded to destination address by AN.
Can be forwarded to the purpose network as converging net according to the destination address in the data forwarding table, also can be other user.
In the data forwarding table, can be the IPoX form by the PPPoX format conversion, promptly finish the decapsulation of PPPoX, and data message is mail to corresponding target IP address according to this table with corresponding data message;
After allowing the user to insert, set up the other end that PPP is connected with the user and also can send datagram to the user, after AN receives these data messages, according to the data forwarding table setting up and safeguard data message is sent to the user.If desired, for example the data message that receives of AN is the IPoX form, or it is different with the bearing mode of network to insert side, and then the AN data message format conversion that needs earlier to receive is for inserting the PPPoX form that side is approved.
Step 29: this data message is abandoned.
PPPoX provides point-to-point connection, more than be that the PPP that the user sends is inserted the process that message is handled, by above-mentioned workflow as can be seen, the PPP that the user sends inserts message to be separated at AN, AN transmits data message, handles and protocol massages is sent to AC.Thereby realize the control that PPP inserts is separated with carrying, make the innovation of access control technology and the evolution of bearer network be independent of each other, be beneficial to the expansion and upgrading of network.
By above embodiment a kind of PPP cut-in method has been described, a kind of PPP connecting system is described by the following examples, this system comprises: access node apparatus, access controller, wherein:
Access node apparatus, the PPP that is used to receive from the user inserts message, judge that it is protocol massages or data message that described PPP inserts message, and when described PPP access message is protocol massages, sending it to access controller handles, when the message that the permission user who receives the access controller transmission inserts, create and maintain sessions data forwarding table; When described PPP access message is data message, it is transmitted according to described data forwarding table;
Access controller is used for according to the protocol massages that receives the user being carried out access-in management, and protocol massages is sent to the user by access node apparatus.
Access node apparatus also can be used for mailing to the user's data message to the user; Reception is from the PPPoX protocol massages of access controller and be sent to the user;
As shown in Figure 3, RG31, AN32, AC33 and converge net 35 and formed an Access Network, AN connects AC in logic.
RG31 is used to initiate PPP and calls out, and the request access network receives ppp protocol message and PPP information message.
It still is the ppp protocol message for the PPP information message that AN32 is used to receive and judge the message that the user sends, when this message is the ppp protocol message, directly sending to AC33 authenticates the user, when being the PPPoX data message, transmits this message according to the data forwarding table, as being sent to ISP (ISP, Internet Service Provider) network 36 by converging net 35.To converge the data message forwarding that mails to RG31 that net 35 sends to the user, the protocol massages that mails to RG31 that AC33 is sent directly sends.
AC33 is used for PPP connected and controls and the user is carried out access-in management, carries out authentication as authentication information being mail to aaa server, and the state machine of maintenance of PPP promptly carries out the conversion of different negotiation phases simultaneously.
Aaa server 34 is used for the user is carried out authentication, mandate, charging.
Below by embodiment a kind of access node apparatus is described, this equipment comprises: message receives recognition unit, packet sending unit, memory cell, wherein:
Message receives recognition unit, and being used to receive the PPP message and discerning the described PPP message that receives is protocol massages or data message;
Packet sending unit receives the protocol massages that recognition unit receives with message and is forwarded to first destination address, according to the data forwarding table of storing in the memory cell message is received data message forwarding to the second destination address that recognition unit receives;
Memory cell is used to store the data forwarding table.
In order to adapt to different network carrying modes, this access node apparatus also comprises format conversion unit, is used for according to the bearing mode of purpose network the message that message receives the recognition unit transmission being carried out re-sending to packet sending unit after the format conversion.As carrying out the conversion of PPPoX and IPoX, the mutual conversion of PPPoA and PPPoE.
Access device structural representation as shown in Figure 4, this node device comprises: message receives recognition unit 41, packet sending unit 42, memory cell 43, format conversion unit 44, wherein:
Message receives recognition unit 41, and being used to receive the PPP message and discerning the described PPP message that receives is protocol massages or data message;
And the data forwarding table of forwarding data message institute foundation, wherein parameter can comprise PPP session identification, access user ID, forward-path sign.As required, this access node apparatus also can obtain other needed PPP signaling informations and be used as parameter in the data forwarding table.
In the various embodiments described above, by access node apparatus the PPPoX from user side being inserted message judges, isolate data message and protocol massages, and data message transmitted, and carry out access control and management according to protocol massages by access controller, thus finished separating of PPP access control and carrying, make the innovation of PPP access control technology and the evolution of bearer network to be independent of each other, be beneficial to the expansion and upgrading of network, also saved the network operation cost simultaneously.
Simultaneously, be responsible for the user is carried out access control and management by access controller, and transmit packet by access node apparatus, network load is shared by the two, thereby improved the utilization ratio of equipment, the a certain facility load of having avoided network is overweight and influence the operation of whole network, has reduced the performance requirement to the network equipment.
More than a kind of PPP cut-in method provided by the present invention, system and access node apparatus are described in detail by embodiment, the explanation of above embodiment just is used for help understanding method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a point-to-point protocol cut-in method is characterized in that, comprising:
The point-to-point protocol that access node apparatus receives from the user inserts message, judges that it is protocol massages or data message that described point-to-point protocol inserts message;
When described point-to-point protocol access message is protocol massages, described protocol massages is sent to access controller, and the user is carried out access-in management by described access controller, if access controller allows the user to insert, then set up and service data is transmitted by access node apparatus;
When described point-to-point protocol access message is data message, according to described data forwarding table described data message is transmitted by access node apparatus.
2. point-to-point protocol cut-in method as claimed in claim 1, it is characterized in that access node apparatus is to obtain user accessing information and set up described data forwarding table by the point-to-point protocol signaling message of supervisory user and access controller or by additional control protocol.
3. point-to-point protocol cut-in method as claimed in claim 1 or 2 is characterized in that, described data forwarding table comprises parameter: point to point protocol session sign, access user ID, forward-path sign.
4. point-to-point protocol cut-in method as claimed in claim 1 or 2 is characterized in that, access node apparatus further comprises before the described data message forwarding that receives:
Access node apparatus carries out format conversion according to the difference of network carrying mode with the data message that receives.
5. point-to-point protocol cut-in method as claimed in claim 1 or 2 is characterized in that, described point-to-point protocol inserts and comprises that the net loaded point-to-point protocol of asynchronous transfer mode inserts, the point-to-point protocol of Ethernet bearing inserts.
6. a point-to-point protocol connecting system is characterized in that, comprises access node apparatus, access controller, wherein:
Access node apparatus, the point-to-point protocol that is used to receive from the user inserts message, judge that it is protocol massages or data message that described point-to-point protocol inserts message, and when described point-to-point protocol access message is protocol massages, sending it to access controller handles, when the message that the permission that receives the access controller transmission inserts, establishment and service data are transmitted; When described point-to-point protocol access message is data message, it is transmitted according to described data forwarding table;
Access controller is used for according to the protocol massages that receives the user being carried out access-in management.
7. point-to-point protocol connecting system as claimed in claim 6 is characterized in that, described access controller is a Broadband Remote Access Server.
8. an access node apparatus is characterized in that, comprises that message receives recognition unit, packet sending unit, memory cell, wherein:
Message receives recognition unit, and being used to receive point-to-point protocol massages and discerning the described point-to-point protocol message that receives is protocol massages or data message;
Packet sending unit receives the protocol massages that recognition unit receives with message and is forwarded to first destination address, according to the data forwarding table of storing in the memory cell message is received data message forwarding to the second destination address that recognition unit receives;
Memory cell is used to store the data forwarding table.
9. access node apparatus as claimed in claim 8 is characterized in that, also comprises format conversion unit, is used for according to the bearing mode of purpose network the message that message receives the recognition unit transmission being carried out re-sending to packet sending unit after the format conversion.
10. access node apparatus as claimed in claim 8 or 9 is characterized in that described data forwarding table comprises parameter: the point to point protocol session sign, insert user ID, forward-path sign.
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| CN 200710085357 CN101257420A (en) | 2007-03-02 | 2007-03-02 | Point-to-point protocol accessing method, system as well as access node equipment |
| PCT/CN2008/070352 WO2008106881A1 (en) | 2007-03-02 | 2008-02-25 | A ppp access method, corresponding system and access node device |
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| CN 200710085357 CN101257420A (en) | 2007-03-02 | 2007-03-02 | Point-to-point protocol accessing method, system as well as access node equipment |
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| CN104125191A (en) * | 2013-04-23 | 2014-10-29 | 华为技术有限公司 | Processing method, device and system of point to point protocol over Ethernet |
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| CN1192575C (en) * | 2002-02-10 | 2005-03-09 | 华为技术有限公司 | Method of realizing quick inserting ethernet load point to point protocol using network processor |
| ATE383022T1 (en) * | 2002-06-13 | 2008-01-15 | Alcatel Lucent | ALLOCATION OF TRANSMISSION CAPACITY OF A COMMON MEDIUM IN A MULTIPOINT-TO-POINT NETWORK |
| CN100484074C (en) * | 2003-07-25 | 2009-04-29 | 华为技术有限公司 | A method for realizing the PPPoA to PPPoE conversion in the network access equipment |
| KR100776308B1 (en) * | 2005-12-12 | 2007-11-13 | 한국전자통신연구원 | method and apparatus for scheduling to guarantee QoS of VoIP service in portable internet system |
| CN100562175C (en) * | 2007-07-26 | 2009-11-18 | 中兴通讯股份有限公司 | Data transmission method and device |
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