CN104219111B

CN104219111B - Link bundling method and communication system based on MLPPP

Info

Publication number: CN104219111B
Application number: CN201310211014.3A
Authority: CN
Inventors: 赵小江; 章军; 赵狄华; 胡勇锋; 金晓晓; 张璐; 王翔
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2018-02-23
Anticipated expiration: 2033-05-31
Also published as: CN104219111A

Abstract

The embodiment of the invention discloses a kind of link bundling method and communication system based on MLPPP, one of which method includes：Endpoint Discriminator fields in MLPPP agreements are extended in advance, are entered as the IMSI of terminal as terminal iidentification；When multilink gateway receives the PPP session messages of terminal transmission, using the value of Endpoint Discriminator field extensions part therein as the terminal iidentification of PPP virtual sessions, and Endpoint Discriminator address pools are established with this；When the LCP that multilink gateway receives terminal initiation establishes link negotiation request, the value of the expansion of Endpoint Discriminator fields in link negotiation request is established according to LCP, the ppp link for belonging to same terminal is bound.The embodiment of the present invention can be realized binds to the different ppp links of same terminal.

Description

Link bundling method and communication system based on MLPPP

Technical field

It is especially a kind of to be based on Multi-Link Point-to-Point Protocol the present invention relates to the communication technology（Multilink-Point-to- Point Protocol, MLPPP）Link bundling method and communication system.

Background technology

Wireless communication technology develops rapidly at present, quick popularization, wireless access and transmission based on wireless communication technology Obtain more and more extensive application.Higher speed, more stable access are pursued as the technology of users and operator.It is existing Some wireless access liftings depend on following several ways.

1st, base station construction；

2nd, wireless communication technology evolution；

3rd, link bundling technology.

Three of the above mode can improve wireless broadband Internet access speed, but first way Meteorological is more, income Area is only base station range, and can not lift user's maximum and use bandwidth.

The second way needs the research of the communication technology ripe, and operator is also required to the overall upgrading of whole wireless system, It is huge to put into resource, construction period length.

The third mode is that the interface of multiple encapsulation same link layer protocols is passed through into point-to-point protocol（Point-to- Point Protocol, PPP）Link bundling forms a data link in logic to together.The effect of link bundling has：（1）Flow load sharing：In/out flow can be shared between multiple member interfaces；（2）Increase bandwidth：Link bundling interface Bandwidth be each available member interface bandwidth summation；（3）Improve connection reliability：When some member interface breaks down, Flow can be automatically switched on other available member interfaces, so as to improve the connection reliability of whole binding link.

Most widely used in link bundling technology is exactly MLPPP technologies.MLPPP is developed on the basis of PPP. With PPP difference be MLPPP can will from identical source address to identical destination address, meet " certain " condition it is more Individual link bundling together, forms a virtual link, referred to as a link bundle（Bundle）.User or Internet will Bundle is as a common link, to its transmission or received data packet.It can actually be tied up in Bundle by multiple physical links Surely form, how the content such as subpackage/integration is transparent to upper strata to data between each link in Bundle.Multilink is tied up Be scheduled on together formed Bundle after, the available bandwidth between transmitting terminal and receiving terminal be exactly all links in Bundle bandwidth it With the efficiencies of transmission of data can so be greatly improved.

MLPPP main advantage is：It is disclosed standard, therefore at least provides the collaboration across manufacturer in theory Ability to work and compatibility.Even for wall scroll transmission control protocol/IP(Internet Protocol)（Transmission Control Protocol/Internet Protocol, TCP/IP）Connection similarly has advantage, for example, a FTP （File Transfer Protocol, FTP）Download, it becomes possible to benefit is obtained from multilink.If through two chains of binding A file is downloaded in one ppp multilink connection on road, and the speed of download will be fast twice.Either ftp client still takes Business device end is all without the connection among perceiving being a multilink.In simple terms, because MLPPP is transparent agreement, Ren He The agreement of single connection is used between server end and client, is benefited during all the bandwidth provided from multilink is integrated.

Link bundling technology is that current industry increases band width in physical, improves the main stream approach of message transmission rate, however, During realizing the present invention, inventor has found that existing MLPPP at least has problems with：

Existing MLPPP does not provide concrete implementation for belonging to how the different ppp links of same terminal bind Method；

Existing MLPPP agreements are designed for the multilink binding of cable broadband, by dividing equally over a different link Data, so as to realize multi-chain circuit transmission, to prevent that link-speeds are inconsistent, take the distribution side on the basis of speed lowest link Formula, therefore MLPPP actual transfer rate is the multiple of current ink medium-rate lowest link, when lowest link and other links When differing greatly, short -board effect can be caused.By the way that multiple links are compared, according to the minimum link of speed come it is balanced other The speed of high-speed link, is overlapped to multilink, and PPP message packets are at the uniform velocity transmitted on multilink, with Obtain higher transmission rate.Existing way is used under cable broadband environment and is possible, because cable broadband is dry by the external world Disturb small, speed is relatively uniform, therefore short -board effect unobvious.And apply in wireless transmission environments, due to the speed of wireless network Rate fluctuation is bigger, therefore the speed of each of the links is very unbalanced, and MLPPP will use the minimum link of speed as other chains The standard of road transmission, directly results in the short -board effect in transmission, does not support heterogeneous network to bind so that more times obtain speed Possibility substantially reduces, poor practicability.

The content of the invention

First technical problem to be solved of the embodiment of the present invention be：A kind of link bundling side based on MLPPP is provided Method and communication system, the different ppp links of same terminal are bound with realizing.

Second technical problem to be solved of the embodiment of the present invention be：So that every chain in the multilink based on MLPPP Even road is unbalanced, the speed of total link remains able to the speed sum for reaching current single link.

To solve above-mentioned first technical problem, a kind of link bundling side based on MLPPP provided in an embodiment of the present invention Method, including：

The end points authenticator Endpoint Discriminator fields in MLPPP agreements are extended in advance, The international mobile subscriber identity IMSI of the expansion assignment terminal of Endpoint Discriminator fields is as terminal Mark；

When multilink gateway receives the point-to-point protocol PPP session messages of terminal transmission, with PPP session messages Terminal iidentification of the value of Endpoint Discriminator field extensions part as PPP virtual sessions, and established with this Endpoint Discriminator address pools, the Endpoint Discriminator address pools include terminal iidentification with PPP virtual sessions identify, and the PPP virtual sessions identify one PPP virtual session of unique mark；

When the connection control protocol LCP that multilink gateway receives terminal initiation establishes link negotiation request, established according to LCP The value of the expansion of Endpoint Discriminator fields, will belong to the PPP chains of same terminal in link negotiation request Road is bound, and obtains multilink.

In one specific embodiment of the above method, Endpoint in link negotiation request is established according to LCP The value of the expansion of Discriminator fields, the PPP links for belonging to same terminal are carried out into binding includes：

Inquire about in current Endpoint Discriminator address pools whether there is and establish link negotiation request with LCP The consistent terminal iidentification of the value of the expansion of middle Endpoint Discriminator fields；

Established if existing in current Endpoint Discriminator address pools with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields, the current LCP that initiates is established into link The terminal for consulting request is added in the corresponding PPP virtual sessions of the terminal iidentification consistent with this, obtains multilink.

In one specific embodiment of the above method, in addition to：

Established if being not present in current Endpoint Discriminator address pools with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields, then established for current PPP connections new PPP sessions.

In one specific embodiment of the above method, the connection control protocol LCP that multilink gateway receives terminal initiation is built After vertical link negotiation request, in addition to：

Multilink gateway inquiry LCP establishes the extension of Endpoint Discriminator fields in link negotiation request Whether part is entered as the IMSI of terminal；

If the expansion of Endpoint Discriminator fields is entered as the IMSI of terminal, the basis is performed LCP establishes the value of the expansion of Endpoint Discriminator fields in link negotiation request, will belong to same terminal The operation bound of ppp link；

Otherwise, if the expansion of Endpoint Discriminator fields is not entered as the IMSI of terminal, multichain Road network pass refusal falls the LCP and establishes link negotiation request.

In one specific embodiment of the above method, in addition to：

When any link down in multilink, failure or dormancy, multilink gateway future time piece from Move the flow equalization on the dismounting, failure or dormancy link to other links in multilink, to ensure that terminal online is flat Surely.

In one specific embodiment of the above method, in addition to：

When PPP virtual sessions are removed completely, multilink gateway removes all PPP sessions that whole virtual session includes To discharge resource.

In one specific embodiment of the above method, in addition to：

Multilink gateway according to the line status of terminal current feedback and the line status historical statistical data fed back before, The flow load ratio of each of the links in multilink is calculated, the data flow for being sent to terminal is distributed by flow load ratio more Each link in link.

It is provided in an embodiment of the present invention a kind of to being established by above-described embodiment to solve above-mentioned second technical problem Multilink based on MLPPP carries out the balanced method of up-link, including：

The loading condition of the physical layer evolution data EVDO reverse links of each of the links, portfolio in terminal detection multilink Pilot tone is than T2P resource allocation conditions and Weighted rate equilibrium situation；

The loading condition of the physical layer EVDO reverse links for each of the links that terminal obtains according to detection, T2P resource allocations Situation and Weighted rate equilibrium situation, the up Internet protocol IP allocation of packets ratio of each of the links in multilink is determined, So as to control the speed uplink difference of different links.

It is provided in an embodiment of the present invention a kind of to being established by above-described embodiment to solve above-mentioned second technical problem The method that multilink based on MLPPP carries out downlink EQUALIZE, including：

Terminal, by the extended packet in LCP ECHO, is reported in multilink with prefixed time interval to multilink gateway The current downstream rate ratio of each of the links；

The downstream rate ratio that multilink gateway reports according to terminal and the downstream rate ratio history parameters fed back before, Each of the links is calculated in multilink in the downstream IP data bag allotment ratio of next timeslice.

In one specific embodiment of the above method, in addition to：

The initial IP allocation of packets ratio that link is newly added in multilink is set in multilink each of the links upper one The average value of the downstream IP data bag allotment ratio of individual timeslice.

To solve above-mentioned second technical problem, a kind of base established by above-described embodiment provided in an embodiment of the present invention The equalization methods between MLPPP multilink, including：

Total communication data buffer memory is set to equipment room virtual link passage in terminal and multilink gateway；

The communications status of each of the links, the communication shape of previous cycle each of the links in the multilink detected according to terminal State, analysis were obtained in next cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；

The currently active communication data in multilink is selected to delay according to the current efficient communication data buffer storage amount of each of the links The maximum link of storage sends IP packets, so as to realize the equilibrium between link.

In one specific embodiment of the above method, the analysis was obtained in next cycle, the prediction bandwidth of each of the links Ratio and communication data buffer memory include：

Set the current IP packets of each link channel to reduce ratio to be：

Obtaining each link channel needs to reduce buffer memory：Tx=(Ti/Tall)*X；

Obtain the caching of each link channel next stage：Ti=Ti-Tx；

Wherein, T is the time of a cycle；S is the sequence number difference of packet loss and newest bag；N is packet loss amount；Tavg is IP numbers According to the message average delay of bag, obtained by the response time for measuring message in link circuit；SMAX is alarm sequence threshold value, When SMAX alarm sequences are late for data message, the difference between the test serial number and the test serial number of reality that receive；Ti is chain Paths cache, and Tall is total caching, and Tavg, SMAX, Ti, Tall are predetermined constant.

In one specific embodiment of the above method, in addition to:

The line state information of all links in multilink is fed back to multilink gateway by terminal；

Multilink gateway judges whether to receive the line state information of all links in multilink；

If not receiving the line state information of wherein one link, the link flow is handled by half.

In one specific embodiment of the above method, in addition to:

When the line state information of same link, which occurs the M times, to be lost, multilink gateway hangs up the link, the link Flow rate ratio press current IP allocation of packets pro rate by other links in multilink.

In one specific embodiment of the above method, in addition to:

When the link of hang-up reactivates, the link is shared equally stream as other links in new link and multilink Amount.

In one specific embodiment of the above method, in addition to:

Mark is in Magic Number and current ink in the new PPP sessions for adding link of multilink gateway identification The Magic Number of the ppp link of state of activation are identical, then remove the ppp link of current unactivated state.

In order to solve the above technical problems, a kind of communication system provided in an embodiment of the present invention, including terminal and multichain road network Close；

The terminal, in advance to the end points authenticator Endpoint Discriminator fields in MLPPP agreements Be extended, Endpoint Discriminator fields expansion assignment terminal IMSI as terminal iidentification, will Endpoint Discriminator field extensions part in PPP session messages is entered as the terminal iidentification of the terminal, and to Multilink gateway sends point-to-point protocol PPP session messages；And initiate LCP to multilink gateway and establish link negotiation request, The expansion that the LCP establishes Endpoint Discriminator fields in link negotiation request is entered as end of the terminal End mark；

The multilink gateway, for receive terminal transmission point-to-point protocol PPP session messages when, with PPP meetings Terminal iidentification of the value of the Endpoint Discriminator field extensions part in message as PPP virtual sessions is talked about, and Endpoint Discriminator address pools are established with this, the Endpoint Discriminator address pools include Terminal iidentification identifies with PPP virtual sessions, and the PPP virtual sessions identify one PPP virtual session of unique mark；And Receive terminal initiation LCP establish link negotiation request when, according to LCP establish link negotiation request in Endpoint The value of the expansion of Discriminator fields, the ppp link for belonging to same terminal is bound, obtains multilink.

In one specific embodiment of said system, the multilink gateway is established in link negotiation request according to LCP The value of the expansion of Endpoint Discriminator fields, when the ppp link for belonging to same terminal is bound, tool Body is inquired about in current Endpoint Discriminator address pools whether there is and established with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields；If current Endpoint Exist in Discriminator address pools and establish Endpoint Discriminator fields in link negotiation request with LCP The consistent terminal iidentification of the value of expansion, by it is current initiate LCP establish link negotiation request terminal be added to it is consistent with this Terminal iidentification corresponding in PPP virtual sessions, obtain multilink；If current Endpoint Discriminator addresses It is consistent in the absence of the value that the expansion of Endpoint Discriminator fields in link negotiation request is established with LCP in pond Terminal iidentification, then establish new PPP sessions for current PPP connections.

In one specific embodiment of said system, the terminal, be additionally operable to detect multilink in each of the links physics Loading condition, T2P resource allocation conditions and the Weighted rate equilibrium situation of layer EVDO reverse links；And obtained according to detection Loading condition, T2P resource allocation conditions and the Weighted rate equilibrium situation of the physical layer EVDO reverse links of each of the links, it is determined that The up Internet protocol IP allocation of packets ratio of each of the links in multilink, so as to control the speed uplink of different links poor It is different.

In one specific embodiment of said system, the terminal, it is additionally operable to pass through LCP ECHO with prefixed time interval In extended packet, report the downstream rate ratio that each of the links is current in multilink to multilink gateway；

The multilink gateway, the downstream rate ratio for being additionally operable to be reported according to terminal and the downstream rate ratio fed back before Rate history parameters, each of the links is calculated in multilink in the downstream IP data bag allotment ratio of next timeslice.

In one specific embodiment of said system, the terminal is additionally operable to detect the communication shape of each of the links in multilink The communications status of state, previous cycle each of the links；Total communication data buffer memory is set to equipment room virtual link passage；According to inspection The communications status of each of the links, the communications status of previous cycle each of the links in the multilink measured, analysis obtain next cycle In, the prediction bandwidth ratio and communication data buffer memory of each of the links；And according to the current efficient communication data of each of the links Buffer memory selects the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, so as to realize chain Equilibrium between road；

The multilink gateway, it is additionally operable to set total communication data buffer memory to equipment room virtual link passage；According to end Communications status, the communications status of previous cycle each of the links of each of the links in the multilink detected are held, analysis obtains next In cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；And according to the current efficient communication of each of the links Data buffer storage amount selects the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, so as to realize Equilibrium between link.

The link bundling method and communication system based on MLPPP provided based on the above embodiment of the present invention, passes through extension Endpoint Discriminator fields in MLPPP agreements realize binds to the different ppp links of same terminal, Solve the problems, such as how the different ppp links of same terminal are bound.Secondly, the embodiment of the present invention passes in multilink In defeated process, by above-mentioned link equalization embodiment of the method, according to chain in the appraisal procedure and algorithm to each of the links state The lack of uniformity on road carries out the modulation of message transmissions, even thus achieving, each of the links is unbalanced, but total link Speed remains able to the technique effect for the speed sum for reaching current single link, overcomes because the speed of single link is inclined It is low, it result in the technical problem of overall rate decline so that link equalization algorithm of the embodiment of the present invention based on MLPPP agreements is not Cable network environment is applicable only to, equally good portfolio effect can be obtained in wireless network environment.

Below by drawings and examples, technical scheme is described in further detail.

Brief description of the drawings

The accompanying drawing of a part for constitution instruction describes embodiments of the invention, and is used to explain together with description The principle of the present invention.

Referring to the drawings, according to following detailed description, the present invention can be more clearly understood, wherein：

Fig. 1 is first link negotiation method for building up flow chart in the multilink in the prior art based on MLPPP agreements.

Fig. 2 is other link negotiations after first link establishment in the multilink in the prior art based on MLPPP agreements Method for building up flow chart.

Fig. 3 is the flow chart of link bundling method one embodiment of the invention based on MLPPP.

Fig. 4 is the flow that the present invention carries out the balanced method one embodiment of up-link to the multilink based on MLPPP Figure.

Fig. 5 is the correspondence schematic diagram between terminal and multilink gateway in embodiment illustrated in fig. 4.

Fig. 6 is the flow of method one embodiment that the present invention carries out downlink EQUALIZE to the multilink based on MLPPP Figure.

Fig. 7 is the flow chart of equalization methods one embodiment between the multilink of the invention based on MLPPP.

Embodiment

The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that：Unless have in addition Body illustrates that the unlimited system of part and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally The scope of invention.

Simultaneously, it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality Proportionate relationship draw.

The description only actually at least one exemplary embodiment is illustrative to be never used as to the present invention below And its application or any restrictions that use.

It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as part for specification.

In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.

It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.

First, the link negotiation method for building up based on MLPPP agreements in the prior art is described in detail.Fig. 1 is First link negotiation method for building up flow chart in multilink in the prior art based on MLPPP agreements.Fig. 2 is in the prior art Other link negotiation method for building up flow charts in multilink based on MLPPP agreements after first link establishment.

Referring to Fig. 1, terminal establishes link using standard PPP protocol.First ppp link carries out connection control protocol （Link control protocol, LCP）, challenge handshake authentication protocol（Challenge Handshake Authentication Protocol, CHAP）And IP control protocol（Internet Protocol Control Protocol, IPCP）Consult, wherein packet radio gateway is as Level 2 Tunnel Protocol（Layer2Tunneling Protocol, L2TP）Visit Ask concentrator（Layer2tunnel protocol Access Concentrator, LAC）, multilink gateway is as L2TP nets Network server（L2TP Network Server, LNS）, L2TP tunnels are established, when terminal carries out first bar link connection, in LAC After the completion of certification, LNS carries out secondary checking, and specific flow is as follows：

The LCP of the first time standard PPP protocol of first link consults；

The certification of the first time standard PPP protocol of first link, notice initiates the terminal of dialing after certification success；

The VPDN tunnels of standard L2TP agreements of first link and the negotiation of session；

Under the standard L2TP agreements of first link, the LCP of PPP sessions consults again；

The re-authentication of PPP under the standard L2TP agreements of first link；

The ipcp negotiation of the standard PPP protocol of first link, after consulting successfully, first link establishment success.

After the negotiation Establishing process of first link is completed, other ppp links of same terminal need to only carry out LCP associations Business, idiographic flow is referring to Fig. 2.

Fig. 3 is the flow chart of link bundling method one embodiment of the invention based on MLPPP.As shown in figure 3, the implementation Link bundling method of the example based on MLPPP includes：

310, in advance to the end points authenticator in MLPPP agreements（Endpoint Discriminator）Field is expanded Exhibition, in the international mobile subscriber identity of the expansion assignment terminal of Endpoint Discriminator fields（IMSI）Make For terminal iidentification.

Specifically, terminal follows standard RFC LCP negotiation options.The embodiment of the present invention is to Endpoint Discriminator fields are extended, using IMSI as eventually in the extension of Endpoint Discriminator fields Hold unique descriptor, it is ensured that terminal uniqueness.To the following institute of specific extended example of Endpoint Discriminator fields Show：

0Null Class

1Locally Assigned Address

2Internet Protocol(IP)Address

3IEEE802.1Globally Assigned MAC Address

4PPP Magic-Number Block

5IMSI

Class=5 use IMSI as address.

Address

Address=IMSI terminals IMSI is global unified value, the address that using terminal IMSI is bound as multimode.It is long Spend for 64bit.

Example：

IMSI=0x0460035566789101

320, when multilink gateway receives the point-to-point protocol PPP session messages of terminal transmission, with PPP session messages Endpoint Discriminator field extensions part terminal iidentification of the value as PPP virtual sessions, and established with this Endpoint Discriminator address pools, the Endpoint Discriminator address pools include terminal iidentification with PPP virtual sessions identify, PPP virtual sessions mark one PPP virtual session of unique mark.

Wherein, multiple PPP sessions that the multilink of binding is carried out are considered as a PPP virtual session.

330, when the connection control protocol LCP that multilink gateway receives terminal initiation establishes link negotiation request, according to LCP The value of the expansion of Endpoint Discriminator fields in link negotiation request is established, same terminal will be belonged to Ppp link is bound, and obtains multilink.

By using the above-mentioned link bundling method of the embodiment of the present invention, the different PPP links of same terminal pass through LCP The IMSI consulted in option Endpoint Discriminator fields is bound, and multilink gateway is for using same end The ppp link of end mark is identified as same PPP virtual sessions.Multiple PPP sessions, a PPP are safeguarded at multilink gateway end Session can include multiple ppp links.

How the link bundling method based on MLPPP that the above embodiment of the present invention provides, solve to same terminal The problem of different ppp links are bound.Secondly, the embodiment of the present invention passes through above-mentioned link during multi-chain circuit transmission Equalization methods embodiment, message transmissions are carried out according to the lack of uniformity of link in the appraisal procedure and algorithm to each of the links state Modulation, even thus achieving, each of the links is unbalanced, but the speed of total link remains able to reach current wall scroll The technique effect of the speed sum of link, overcome the skill that because the speed of single link is relatively low, result in overall rate decline Art problem so that link equalization algorithm of the embodiment of the present invention based on MLPPP agreements can be applied not only to cable network environment, Equally good portfolio effect can be obtained in wireless network environment.

It is unrestricted according to a specific example of link bundling embodiment of the method for the present invention based on MLPPP, operation 330 It can specifically include：

Established if existing in current Endpoint Discriminator address pools with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields, the current LCP that initiates is established into link The terminal for consulting request is added in the corresponding PPP virtual sessions of the terminal iidentification consistent with this, obtains multilink；

Otherwise, asked if being not present in current Endpoint Discriminator address pools and establishing link negotiation with LCP The consistent terminal iidentification of the value of the expansion of middle Endpoint Discriminator fields is sought, then is built for current PPP connections Vertical new PPP sessions.

In another embodiment of link bundling method of the present invention based on MLPPP, in operation 330, multilink gateway Receive terminal initiation LCP establish link negotiation request after, can also include：

If the expansion of Endpoint Discriminator fields is entered as the IMSI of terminal, performs and built according to LCP The value of the expansion of Endpoint Discriminator fields, will belong to the PPP of same terminal in vertical link negotiation request The operation that link is bound；

Otherwise, if the expansion of Endpoint Discriminator fields is not entered as the IMSI of terminal, i.e.,：Not yet Have by Endpoint Discriminator fields carried terminal identify, then multilink gateway refusal fall LCP establish link association Consult and request and ask, asked with shielding illegal link setup.

Each actual ppp link exists as equality link in each PPP virtual sessions, and MLPPP is based in the present invention Link bundling method another embodiment in, it is more when any link down in multilink, failure or dormancy Link gateway is in future time piece automatically by the flow equalization on the dismounting, failure or dormancy link to other in multilink Link, to ensure that terminal online is steady.

In the further embodiment of link bundling method of the present invention based on MLPPP, when PPP virtual sessions are torn open completely Except when, multilink gateway removes all PPP sessions that whole virtual session includes to discharge resource.

In addition, in another embodiment of link bundling method of the present invention based on MLPPP, multilink gateway can be with According to the line status of terminal current feedback（For example, packet loss, the transmission time of IP packets, actual transfer rate etc.）And it The line status historical statistical data of preceding feedback, the flow load ratio of each of the links in multilink is calculated, terminal will be sent to Data flow each link in multilink is distributed by flow load ratio.Line status therein is referred to as Link State Or communications status.

Multilink binding in the embodiment of the present invention, link equalization can be carried out by algorithm, by the influence of short -board effect It is reduced to minimum.For the load balancing of multilink, the strategy controlled respectively by up-link and downlink carries out balanced.

Wherein, the equilibrium of up-link can be controlled by terminal.Terminal is by detecting multiple independent ppp links The loading condition of physical layer EVDO reverse links, T2P resource allocation conditions, Weighted rate equilibrium situation determine the upper of each of the links Row IP bag allocation proportions, so as to control the speed uplink difference of different links.

The equilibrium of downlink, multilink gateway can be controlled for multiple in a session by the method for positive feedback The downstream IP bag allocation proportion of ppp link.Terminal can be with prefixed time interval by LCP ECHO extended packet, to multichain Road network closes the downstream rate ratio for reporting current each of the links.The downstream rate allotment ratio that gateway will be reported according to terminal, According to history parameters, allotment ratio of each link in next timeslice downstream IP bag is calculated.The link newly added is initial Allotment ratio is set to average value, according to will progressively obtain the real allocated ratio of oneself after a period of time synchronization.

Fig. 4 is that the present invention carries out up-link equilibrium to the multilink based on MLPPP established by above-described embodiment The flow chart of method one embodiment.As shown in figure 4, the embodiment carries out up-link equilibrium to the multilink based on MLPPP Method include：

410, terminal detects the physical layer evolution data of each of the links in multilink（Evolution Data Only, EVDO）Loading condition, the portfolio pilot tone ratio of reverse link（Traffic to pilot ratio, T/P or T2P）Resource allocation Situation and Weighted rate equilibrium situation.

420, the loading condition of the physical layer EVDO reverse links for each of the links that terminal obtains according to detection, T2P resources Distribution condition and Weighted rate equilibrium situation, determine the up Internet protocol IP allocation of packets ratio of each of the links in multilink Example, so as to control the speed uplink difference of different links.

As shown in figure 5, the correspondence schematic diagram between terminal in embodiment illustrated in fig. 4 and multilink gateway.

In one embodiment of the present of invention, multilink gateway includes bag shunting arbitration mechanism, can be fed back according to terminal Line status and historical statistical data, calculate each of the links flow load ratio.The data flow for returning to terminal is sent by ratio It is dealt into each ppp link.Fig. 6 is one implementation of method that the present invention carries out downlink EQUALIZE to the multilink based on MLPPP The flow chart of example.As shown in fig. 6, the method that the embodiment carries out downlink EQUALIZE to the multilink based on MLPPP includes：

610, terminal is responded with prefixed time interval by LCP（ECHO）In extended packet, on multilink gateway Report the downstream rate ratio that each of the links is current in multilink.

It is as follows, it is one for velocity rate report and LCP ECHO extended packet in the embodiment of the present invention Concrete structure example：

Identifier：Initialization value is 0, often sends an Echo bag, increase by 1.

Magic-Number：Obtained in LCP link negotiations, for helping distinguish between different LCP links.

Data：1 byte, value 0~100, represent the velocity rate that multiple terminals obtain in contemporary downlink.

620, downstream rate ratio that multilink gateway reports according to terminal and the downstream rate ratio history fed back before Parameter, each of the links is calculated in multilink in the downstream IP allocation of packets ratio of next timeslice.

In a specific embodiment for carrying out the method for downlink EQUALIZE to the multilink based on MLPPP in the present invention, The initial IP allocation of packets ratio that link is newly added in multilink can be set in multilink to each of the links at upper one Between piece downstream IP data bag allotment ratio average value.

In one embodiment of the invention, store-and-forward mechanism is often used using the network equipment, realizes the transmission of data message.Its In be directed to each virtual link, distribute fixed caching, and according to every ppp Link State, caching is distributed into specific chain Road so that ppp link buffer memory maps the ppp link speed, and the free buffer amount of ppp link maps the free time of the ppp link Degree, while by carrying out serial number again to link layer message, determine link layer data integrality.Fig. 7 is base of the present invention The flow chart of equalization methods one embodiment between MLPPP multilink.As shown in fig. 7, multichain of the embodiment based on MLPPP Equalization methods include between road：

710, total communication data buffer memory is set to equipment room virtual link passage in terminal and multilink gateway.

720, the communication of the communications status, previous cycle each of the links of each of the links in the multilink detected according to terminal State, analysis were obtained in next cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links.

730, the currently active communication number in multilink is selected according to the current efficient communication data buffer storage amount of each of the links IP packets are sent according to the maximum link of buffer memory, so as to realize the equilibrium between link.

Between the above-mentioned multilink based on MLPPP of the present invention in equalization methods embodiment, band between a kind of multilink is employed Width distribution and Forecasting Methodology, by the control total data caching and valid data caching communication equipment, distribution, realize each Effective prediction of interlink communication bandwidth change and rapid feedback.

Unrestricted, the root according to a specific example of equalization methods embodiment between multilink of the present invention based on MLPPP Sequence number according to packet loss and newest bag is poor, carries out statistics calculating to the exception message that packet loss occurs, obtains final line status （I.e.：Whether state is good）.The sequence number when weight of each exception message is finally received by the message and when should receive Sequence number difference determines that sequence number difference is bigger to illustrate that the channel delay is more serious, it is therefore desirable to calculates the weights of the message.Operation In 720, it specifically can in the following manner analyze and obtain in next cycle, the prediction bandwidth ratio and communication data of each of the links Buffer memory：

Set the current IP packets of each link channel to reduce ratio to be：

Obtaining each link channel needs to reduce buffer memory：Tx=(Ti/Tall)*X；

Obtain the caching of each link channel next stage：Ti=Ti-Tx；

In practice, the conversion of forecast model can be such as converted according to application experience and flow, again by adjusting formula Determine the change formula of flow.Or the application effect according to reality, specific α, β parameter is adjusted, adjusts pace of change, it is determined that Optimum efficiency.

Because wireless environment is complicated, in weak signal overlay area or weak overlay area handoff procedure, it may appear that at one section The situation that reverse link can not transmit data before interior terminal and link of eating dishes without rice or wine is not dismantled, in this case, present terminal Corresponding ppp link is defined as inactive ppp link.Within this period, terminal is reported without normal direction multilink gateway Current Link State, if gateway is still according to speed proportional allocation of downlink packet before, it will cause whole link In can not normal transmission data, to avoid this situation, link equalization algorithm does following automatic adapt to.

In each link of same terminal is reported, comprising all link-state informations（Also referred to as line status is believed Breath）.When each of the links can receive status information, then carried out according to normal flow, in the event of losing, then by the link flow Handle by half, third time hangs up the link when losing.The flow rate ratio of the link, divided again by current radio by remaining link Match somebody with somebody.During link activation, according to new link processing, flow is shared equally.

Eat dishes without rice or wine to operate if the terminal in unactivated state can recover current, the ppp link of unactivated state The ppp link of state of activation will be switched to, but if in the case that link of eating dishes without rice or wine is dismantled, terminal will dial again establishes PPP companies Connect, and now multilink gateway is required to irreclaimable inactive ppp link automatic disassembling.Link gateway needs basis Magic Number are identified, if newly adding Magic Number and the current ink acceptance of the bid of the ppp link of current sessions It is designated as that the Magic Number of the ppp link of unactivated state are identical, then the ppp link of current unactivated state will be removed. New ppp link will be added into current sessions.

In the present invention based in another embodiment of equalization methods between MLPPP multilink, can also include:

In the present invention based in another embodiment of equalization methods between MLPPP multilink, when the line of same link When the M times loss occurs for line state information, multilink gateway can hang up the link, and the flow rate ratio of the link is by multilink Other links press current IP allocation of packets pro rate, wherein M is the default integer more than zero, for example, M value can be with For 3.

In the present invention based in another embodiment of equalization methods between MLPPP multilink, when hang-up link again During activation, multilink gateway can share the link equally flow as other links in new link and multilink.I.e.：Work as hang-up Link recover because of signal intensity, state, which receives, the reason such as recovers when reactivating, and according to new link processing, shares flow equally.

In the present invention based in the further embodiment of equalization methods between MLPPP multilink, multilink gateway can be known The ppp link for being is marked in the Magic Number and current ink that do not add not newly in the PPP sessions of link Magic Number are identical, then illustrate that the ppp link reconnects, remove the ppp link of current unactivated state.

The embodiment of the present invention additionally provides a kind of communication system, the method for realizing the above embodiment of the present invention.Wherein The communication system of one embodiment includes terminal and multilink gateway.Wherein：

Terminal, for being extended in advance to the Endpoint Discriminator fields in MLPPP agreements, The IMSI of the expansion assignment terminal of Endpoint Discriminator fields is as terminal iidentification, by PPP session messages In Endpoint Discriminator field extensions part be entered as the terminal iidentification of the terminal, and sent out to multilink gateway Send PPP session messages；And initiate LCP to multilink gateway and establish link negotiation request, LCP is established in link negotiation request The expansion of Endpoint Discriminator fields is entered as the terminal iidentification of the terminal.

Multilink gateway, for receive terminal transmission PPP session messages when, with PPP session messages Terminal iidentification of the value of Endpoint Discriminator field extensions part as PPP virtual sessions, and established with this Endpoint Discriminator address pools, Endpoint Discriminator address pools include terminal iidentification and PPP Virtual session identifies, PPP virtual sessions mark one PPP virtual session of unique mark；And receiving terminal initiation When LCP establishes link negotiation request, Endpoint Discriminator fields in link negotiation request are established according to LCP The value of expansion, the PPP links for belonging to same terminal are bound, obtain multilink.

In another embodiment of communication system of the present invention, multilink gateway is established in link negotiation request according to LCP The value of the expansion of Endpoint Discriminator fields, when the ppp link for belonging to same terminal is bound, tool Body can whether there is to establish link negotiation request with LCP in the current Endpoint Discriminator address pools of inquiry The consistent terminal iidentification of the value of the expansion of middle Endpoint Discriminator fields；If current Endpoint Exist in Discriminator address pools and establish Endpoint Discriminator fields in link negotiation request with LCP The consistent terminal iidentification of the value of expansion, by it is current initiate LCP establish link negotiation request terminal be added to it is consistent with this Terminal iidentification corresponding in PPP virtual sessions, obtain multilink；If current Endpoint Discriminator addresses It is consistent in the absence of the value that the expansion of Endpoint Discriminator fields in link negotiation request is established with LCP in pond Terminal iidentification, then establish new PPP sessions for current PPP connections.

In another embodiment of communication system of the present invention, terminal, it may also be used for each of the links in detection multilink Loading condition, T2P resource allocation conditions and the Weighted rate equilibrium situation of physical layer EVDO reverse links；And according to detecting The loading condition of the physical layer EVDO reverse links of each of the links arrived, T2P resource allocation conditions feelings balanced with Weighted rate Condition, the up Internet protocol IP allocation of packets ratio of each of the links in multilink is determined, so as to control the upper of different links Row speed difference.

In another embodiment of communication system of the present invention, terminal, it may also be used for LCP is passed through with prefixed time interval Extended packet in ECHO, the downstream rate ratio that each of the links is current in multilink is reported to multilink gateway.Correspondingly, Multilink gateway, it may also be used for the downstream rate ratio reported according to terminal and the downstream rate ratio history fed back before are joined Number, each of the links is calculated in multilink in the downstream IP data bag allotment ratio of next timeslice.

In another embodiment of communication system of the present invention, terminal, it may also be used for each of the links in detection multilink The communications status of communications status, previous cycle each of the links；Total communication data buffer memory is set to equipment room virtual link passage； According to the communications status of each of the links in the multilink detected, the communications status of previous cycle each of the links, under analysis obtains In one cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；And effectively lead to according to each of the links is current Letter data buffer memory selects the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, so as to Realize the equilibrium between link.Multilink gateway, it may also be used for total communication data buffer memory is set to equipment room virtual link passage； The communications status of each of the links, the communications status of previous cycle each of the links, analysis obtain in the multilink detected according to terminal Obtain in next cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；And have according to each of the links is current Communication data buffer memory is imitated to select the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, from And realize the equilibrium between link.

Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and its The difference of its embodiment, same or analogous part cross-reference between each embodiment.For system embodiment For, because it is substantially similar to embodiment of the method, so description is fairly simple, referring to the portion of embodiment of the method in place of correlation Defend oneself bright.

Method, the system of the present invention may be achieved in many ways.For example, software, hardware, firmware or soft can be passed through Part, hardware, firmware any combinations come realize the present invention method and system.The said sequence of the step of for methods described is only It is to illustrate, is not limited to order described in detail above the step of method of the invention, unless otherwise especially Explanation.In addition, in certain embodiments, the present invention can be also embodied as recording program in the recording medium, these program bags Include the machine readable instructions for realizing the method according to the invention.Thus, the present invention also covering storage is used to perform according to this The recording medium of the program of the method for invention.

One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through Programmed instruction related hardware is completed, and foregoing program can be stored in a computer read/write memory medium, the program Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light Disk etc. is various can be with the medium of store program codes.

Endpoint Discriminator fields in the extension MLPPP agreements that the embodiment of the present invention passes through realize pair The different ppp links of same terminal are bound, and are solved how to bind the different ppp links of same terminal and are asked Topic.Secondly, compared with prior art, the present invention is during multi-chain circuit transmission, to the appraisal procedure of each of the links state and The modulation of message transmissions is carried out on algorithm according to the lack of uniformity of link, even it is unbalanced to thus achieve each of the links, But the speed of total link remains able to the technique effect for the speed sum for reaching current single link, overcomes due to single chain The speed on road is relatively low, result in the technical problem of overall rate decline so that the link equalization of the invention based on MLPPP agreements Algorithm can be applied not only to cable network environment, and equally good portfolio effect can be obtained in wireless network environment.

Description of the invention provides for the sake of example and description, and is not exhaustively or by the present invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch State embodiment and be to more preferably illustrate the principle and practical application of the present invention, and one of ordinary skill in the art is managed The present invention is solved so as to design the various embodiments with various modifications suitable for special-purpose.

Claims

1. a kind of carry out the balanced method of up-link to the multilink based on Multi-Link Point-to-Point Protocol MLPPP, its feature exists In, including：

When the connection control protocol LCP that multilink gateway receives terminal initiation establishes link negotiation request, link is established according to LCP Consult the value of the expansion of Endpoint Discriminator fields in request, the ppp link for belonging to same terminal is entered Row binding, obtains multilink；

The loading condition of the physical layer evolution data EVDO reverse links of each of the links, portfolio pilot tone in terminal detection multilink Than T2P resource allocation conditions and Weighted rate equilibrium situation；

The loading condition of the physical layer EVDO reverse links for each of the links that terminal obtains according to detection, T2P resource allocation conditions With Weighted rate equilibrium situation, the up Internet protocol IP allocation of packets ratio of each of the links in multilink is determined, so as to Control the speed uplink difference of different links.

2. according to the method for claim 1, it is characterised in that Endpoint in link negotiation request is established according to LCP The value of the expansion of Discriminator fields, the ppp link for belonging to same terminal is carried out into binding includes：

Inquire about in current Endpoint Discriminator address pools whether there is and established with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields；

If existing in current Endpoint Discriminator address pools Endpoint in link negotiation request is established with LCP The consistent terminal iidentification of the value of the expansion of Discriminator fields, it current will initiate LCP and establish link negotiation request Terminal is added in the corresponding PPP virtual sessions of the terminal iidentification consistent with this, obtains multilink.

3. according to the method for claim 2, it is characterised in that also include：

4. according to the method for claim 3, it is characterised in that multilink gateway receives the connection control protocol of terminal initiation After LCP establishes link negotiation request, in addition to：

Multilink gateway inquiry LCP establishes the expansion of Endpoint Discriminator fields in link negotiation request The no IMSI for being entered as terminal；

If the expansion of Endpoint Discriminator fields is entered as the IMSI of terminal, execution is described to build according to LCP The value of the expansion of Endpoint Discriminator fields, will belong to the PPP of same terminal in vertical link negotiation request The operation that link is bound；

5. according to the method described in Claims 1-4 any one, it is characterised in that also include：

When any link down in multilink, failure or dormancy, multilink gateway automatically will in future time piece Flow equalization on the dismounting, failure or dormancy link is to other links in multilink, to ensure that terminal online is steady.

6. according to the method for claim 5, it is characterised in that also include：

When PPP virtual sessions are removed completely, multilink gateway removes all PPP sessions that whole virtual session includes to release Put resource.

7. according to the method for claim 6, it is characterised in that also include：

Multilink gateway calculates according to the line status of terminal current feedback and the line status historical statistical data fed back before The flow load ratio of each of the links in multilink, the data flow for being sent to terminal is distributed into multilink by flow load ratio In each link.

8. a kind of method that downlink EQUALIZE is carried out to the multilink based on Multi-Link Point-to-Point Protocol MLPPP, its feature exist In, including：

Terminal, by the extended packet in LCP ECHO, every is reported in multilink to multilink gateway with prefixed time interval The current downstream rate ratio of link；

The downstream rate ratio that multilink gateway reports according to terminal and the downstream rate ratio history parameters fed back before, are calculated Go out in multilink each of the links in the downstream IP data bag allotment ratio of next timeslice.

9. method according to claim 8, it is characterised in that also include：

The initial IP allocation of packets ratio that link is newly added in multilink is set in multilink each of the links at upper one Between piece downstream IP data bag allotment ratio average value.

10. according to the method for claim 8, it is characterised in that Endpoint in link negotiation request is established according to LCP The value of the expansion of Discriminator fields, the ppp link for belonging to same terminal is carried out into binding includes：

11. according to the method for claim 10, it is characterised in that also include：

12. according to the method for claim 11, it is characterised in that multilink gateway receives the connection control association of terminal initiation After view LCP establishes link negotiation request, in addition to：

13. according to the method described in claim 8 to 12 any one, it is characterised in that also include：

14. according to the method for claim 13, it is characterised in that also include：

15. according to the method for claim 14, it is characterised in that also include：

A kind of 16. equalization methods between multilink based on Multi-Link Point-to-Point Protocol MLPPP, it is characterised in that including：

The communications status of each of the links, the communications status of previous cycle each of the links in the multilink detected according to terminal, point Analysis was obtained in next cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；

The currently active communication data buffer memory in multilink is selected according to the current efficient communication data buffer storage amount of each of the links Maximum link sends IP packets, so as to realize the equilibrium between link.

17. method according to claim 16, it is characterised in that the analysis was obtained in next cycle, the prediction of each of the links Bandwidth ratio and communication data buffer memory include：

Set the current IP packets of each link channel to reduce ratio to be：

Obtaining each link channel needs to reduce buffer memory：Tx=(Ti/Tall) * X；

Obtain the caching of each link channel next stage：Ti=Ti-Tx；

Wherein, T is the time of a cycle；S is the sequence number difference of packet loss and newest bag；N is packet loss amount；Tavg is IP packets Message average delay, by measure message in link circuit response time obtain；SMAX is alarm sequence threshold value, SMAX When alarm sequence is late for data message, the difference between the test serial number and the test serial number of reality that receive；Ti leads to for link Road caches, and Tall is total caching, and Tavg, SMAX, Ti, Tall are predetermined constant.

18. method according to claim 16, it is characterised in that also include:

19. method according to claim 18, it is characterised in that also include:

When the line state information of same link, which occurs the M times, to be lost, multilink gateway hangs up the link, the stream of the link Amount ratio presses current IP allocation of packets pro rate by other links in multilink.

20. method according to claim 19, it is characterised in that also include:

When the link of hang-up reactivates, the link is shared equally flow as other links in new link and multilink.

21. method according to claim 20, it is characterised in that also include:

Mark is in Magic Number and current ink in the new PPP sessions for adding link of multilink gateway identification The Magic Number of the ppp link of state are identical, then remove the ppp link of current unactivated state.

22. according to the method for claim 16, it is characterised in that Endpoint in link negotiation request is established according to LCP The value of the expansion of Discriminator fields, the ppp link for belonging to same terminal is carried out into binding includes：

23. according to the method for claim 22, it is characterised in that also include：

24. according to the method for claim 23, it is characterised in that multilink gateway receives the connection control association of terminal initiation After view LCP establishes link negotiation request, in addition to：

25. according to the method described in claim 16 to 24 any one, it is characterised in that also include：

26. according to the method for claim 25, it is characterised in that also include：

27. according to the method for claim 26, it is characterised in that also include：

28. a kind of communication system, it is characterised in that including terminal and multilink gateway；

The terminal, for being carried out in advance to the end points authenticator Endpoint Discriminator fields in MLPPP agreements Extension, Endpoint Discriminator fields expansion assignment terminal IMSI as terminal iidentification, by PPP meetings Endpoint Discriminator field extensions part in words message is entered as the terminal iidentification of the terminal, and to multilink Gateway sends point-to-point protocol PPP session messages；And initiate LCP to multilink gateway and establish link negotiation request, the LCP The expansion for establishing Endpoint Discriminator fields in link negotiation request is entered as the terminal iidentification of the terminal； It is additionally operable to detect the loading condition of the physical layer EVDO reverse links of each of the links in multilink, T2P resource allocation conditions with adding Weigh speed equilibrium situation；And loading condition, the T2P of the physical layer EVDO reverse links of each of the links obtained according to detection are provided Source distribution condition and Weighted rate equilibrium situation, determine the up Internet protocol IP allocation of packets of each of the links in multilink Ratio, so as to control the speed uplink difference of different links；

The multilink gateway, for receive terminal transmission point-to-point protocol PPP session messages when, with PPP session reports Terminal iidentification of the value of Endpoint Discriminator field extensions part in text as PPP virtual sessions, and with this Endpoint Discriminator address pools are established, the Endpoint Discriminator address pools include terminal mark Know and identified with PPP virtual sessions, the PPP virtual sessions identify one PPP virtual session of unique mark；And receiving end When the LCP that end is initiated establishes link negotiation request, Endpoint Discriminator in link negotiation request are established according to LCP The value of the expansion of field, the ppp link for belonging to same terminal is bound, obtains multilink.

29. system according to claim 28, it is characterised in that the multilink gateway is established link negotiation according to LCP and asked The value of the expansion of middle Endpoint Discriminator fields, when the ppp link for belonging to same terminal is bound, Specifically inquire about in current Endpoint Discriminator address pools whether there is and established with LCP in link negotiation request The consistent terminal iidentification of the value of the expansion of Endpoint Discriminator fields；If current Endpoint Exist in Discriminator address pools and establish Endpoint Discriminator fields in link negotiation request with LCP The consistent terminal iidentification of the value of expansion, by it is current initiate LCP establish link negotiation request terminal be added to it is consistent with this Terminal iidentification corresponding in PPP virtual sessions, obtain multilink；If current Endpoint Discriminator address pools In be not present with LCP establish link negotiation request in Endpoint Discriminator fields expansion value it is consistent Terminal iidentification, then establish new PPP sessions for current PPP connections.

30. system according to claim 29, it is characterised in that the terminal, be additionally operable to pass through LCP with prefixed time interval Extended packet in ECHO, the downstream rate ratio that each of the links is current in multilink is reported to multilink gateway；

The multilink gateway, the downstream rate ratio for being additionally operable to be reported according to terminal are gone through with the downstream rate ratio fed back before History parameter, each of the links is calculated in multilink in the downstream IP data bag allotment ratio of next timeslice.

31. system according to claim 29, it is characterised in that the terminal, be additionally operable to detect each of the links in multilink The communications status of communications status, previous cycle each of the links；Total communication data buffer memory is set to equipment room virtual link passage； According to the communications status of each of the links in the multilink detected, the communications status of previous cycle each of the links, under analysis obtains In one cycle, the prediction bandwidth ratio and communication data buffer memory of each of the links；And effectively lead to according to each of the links is current Letter data buffer memory selects the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, so as to real Equilibrium between existing link；

The multilink gateway, it is additionally operable to set total communication data buffer memory to equipment room virtual link passage；Examined according to terminal The communications status of each of the links, the communications status of previous cycle each of the links in the multilink measured, analysis obtain next cycle In, the prediction bandwidth ratio and communication data buffer memory of each of the links；And according to the current efficient communication data of each of the links Buffer memory selects the link that the currently active communication data buffer memory is maximum in multilink to send IP packets, so as to realize link Between equilibrium.