CN106792656A

CN106792656A - A kind of data transmission method and asymmetric separate system

Info

Publication number: CN106792656A
Application number: CN201611087815.3A
Authority: CN
Inventors: 刘泉; 王国骄; 黄兴华
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd; Shanghai Huawei Technologies Co Ltd
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2017-05-31
Anticipated expiration: 2036-11-30
Also published as: CN106792656B

Abstract

This application provides a kind of data transmission method and asymmetric separate system, the descending distributor in existing symmetrical flow division system is subtracted, so as to reduce the time loss during downlink data transmission, and saved the virtual machine cost of distributor.Present invention method includes：First forwarding capability component obtains the upstream data of user equipment, and upstream data is sent to NAT device；NAT device sends to service network upstream data, and receives the downlink data that service network feeds back according to upstream data, and downlink data includes the procotol IP information of service network；The IP information of service network in downlink data is converted to NAT device the IP information of user equipment；NAT device is sent to the second forwarding capability component downlink data according to the IP information of user equipment；Second forwarding capability component determines the corresponding target access network equipment of user equipment according to the IP information of user equipment, and downlink data is sent to target access network equipment.

Description

A kind of data transmission method and asymmetric separate system

Technical field

The application is related to communication technical field, more particularly to a kind of data transmission method and asymmetric separate system.

Background technology

International Telecommunication Union (International Telecommunications Union, ITU) is general in white paper METIS projects have been included to be described the prospect of the 5th third-generation mobile communication technology (5G)：With machine communication (Machine- To-Machine, M2M) bring the growth of thousands of times of mobile flow (flow standard be the 36TB/ months/people), user equipment (User Equipment, UE) (single node quantitative criteria is 30W) is accessed at double, and according to different application scenarios, it is desirable to 5G has Data transfer rate (1-10Gbps) high, low time delay (1 millisecond), high reliability (99.999%) and flexible spectrum application technology etc..And With continuing to develop for cloud computing technology, Internet technology (Internet Technology, IT) and telecommunications network technology (Community Technology, CT) field interpenetrates fusion, and CT operators are that reply cloud computing and virtualization bring Opportunities and challenges, it is proposed that ICT (Information Communications Technology, ICT) lead The cloud computing framework in domain, i.e. network function virtualize (Network Function Virtualization, NFV) standard architecture, To promote mobile network property lifting, cost reduction and facilitate O＆M etc..

It is existing packet-based core networks (Evolved Packet Core, EPC) are virtualized based on NFV standard booms, By mobility management entity (Mobility Management Entity, MME), gateway (Serving in EPC GateWay, SGW), home subscriber server (Home Subscriber Server, HSS) and public data network gateway The various virtualization network function (Virtualization of the composition such as (Public Data Network GateWay, PGW) Network Function, VNF), after the completion of the chain of command attachment flow (Attach) of EPC, the empty port load-supporting of VNF is set up, The grouping system (Evolved Packet System, EPS) of evolution is carried and set up therewith, between access network equipment and SGW and PGW Data transmission tunnel set up, now, UE can be carried out data transmission by access network equipment and data transmission tunnel, such as Fig. 1 Shown, dotted arrow show the flow direction of control signaling, and solid arrow show the flow direction of data, access network equipment (base station ENB) by the distributor of base station side and network side, processing unit 1 and network address translation (Network Address Translation, NAT) gateway realize and Inernet between inside and outside network data conversion.Due to network IP information resources Limitation, it is therefore desirable to which NAT gateway is played a part of to be subnet distribution.

But, the distributor of base station side and network side is to carry out processing data according to base station level to shunt, in public cloud Under scape, due to broad covered area, eNB is large number of, and the expense of distributor is very big；And during downlink processing data, distributor and treatment Overlapping occurs in the forwarding capability of unit, and the execution forwarding capability for repeating will certainly lose time, so as to cause time delay to increase.

The content of the invention

This application provides a kind of data transmission method and asymmetric separate system, existing symmetrical flow division system has been subtracted In descending distributor, so as to reduce the time loss during downlink data transmission, and save the virtual of distributor Machine cost.

First aspect present invention provides a kind of data transmission method, is applied to asymmetric separate system, described asymmetric point Streaming system includes at least two forwarding capability components and network address translation device, including：

First forwarding capability component obtains the upstream data of user equipment, and the upstream data is sent to the NAT Equipment；

The NAT device sends to service network the upstream data, and receives the service network according to The downlink data of upstream data feedback, the downlink data includes the procotol IP information of the service network；

The IP information of service network described in the downlink data is converted to the NAT device IP of the user equipment Information；

The NAT device is sent to the second forwarding capability the downlink data according to the IP information of the user equipment Component；

The second forwarding capability component determines the corresponding mesh of the user equipment according to the IP information of the user equipment Tag splice log equipment, and the downlink data is sent to the target access network equipment.

First forwarding capability component gets the upstream data of the user equipment that base station reports, and base station there may be multiple, And the number of user equipment in the cell of base station covering is in the range of base station can bear, the quantity of specific user equipment Do not limit, the upstream data of the user equipment that will be got is sent in NAT device, NAT device is receiving the first forwarding After the upstream data that functional unit sends, upstream data is sent to service network, upstream data is received in service network Afterwards, upstream data can be fed back, NAT device receives the downlink data that service network feeds back according to upstream data, by Equipment in different network segments is with different IP information, then include the IP of service network in downlink data naturally Information.NAT device is received after downlink data, in addition it is also necessary to which downlink data is sent in user equipment, from downlink data only The IP information of energy terminal service network, then in the case of cannot determining the IP information of user equipment, being cannot be by downlink data It is sent in user equipment, it is necessary to which the IP information of service network is converted to the IP information of user equipment, specific conversion Process is the transformation rule for pre-setting, and existing NAT technologies are to be capable of achieving.NAT device can according to the IP information of user equipment To determine that downlink data needs to be transmitted by which subnet, when forwarding capability component is set, a subnet network segment is general One forwarding capability component of correspondence, therefore, the IP information according to user equipment sends to the second forwarding capability group downlink data Part.Because the second forwarding capability component is stored with the user conversation of user equipment in itself, or (for example access by other means Conversation management functional component) user conversation of the user equipment can be obtained, then and the IP information according to user equipment can be Determine that the user equipment is in the cell where which base station, then determine the corresponding target BS of user equipment (i.e. Target access network equipment) after, downlink data is sent to target BS, downlink data is issued to user equipment by base station.With Prior art is compared, and downlink data needs not move through distributor and retransmits to access network equipment, so as to reduce downlink data transmission During time loss；And the reduction of distributor can save virtual machine cost.

With reference to first aspect present invention, in first aspect present invention first embodiment, the asymmetric separate system is also Including conversation management functional component,

The second forwarding capability component determines the corresponding mesh of the user equipment according to the IP information of the user equipment Tag splice log equipment, and the downlink data is sent to the target access network equipment, including：

Second forwarding capability component conversation management functional component according to the IP message references of the user equipment, Obtain the user conversation of the user equipment；

The second forwarding capability component is according to the user conversation of the user equipment, it is determined that being set up with the user equipment The target access network equipment of communication connection；

The second forwarding capability component sends to the target access network equipment downlink data so that the mesh Tag splice log equipment sends to the user equipment downlink data.

Also include conversation management functional component in asymmetric separate system, conversation management functional component is the meeting of SGW and PGW Words management entity, is responsible for and MME interactions are come the session that creates, change and delete user, therefore, the second forwarding capability component according to The IP message reference conversation management functional components of user equipment can obtain the user conversation of user equipment, can by user conversation With the gateway that clear and definite user equipment is set up included in the communication link being connected with communication network, gateway here can include base Stand or the network equipment such as MME, the target access network equipment that communication connection is set up with user equipment can determine according to user conversation, I.e. determine user equipment be in target BS cell in, the second forwarding capability component determine target access network equipment it Afterwards, downlink data is sent to target access network equipment by forwarding routing function, target access network equipment just can be according to descending The IP information of the user equipment in data, user equipment is issued to by communication link by downlink data.Detailed explains not Distributor is needed, also data is activation to user equipment can accurately will be issued.

With reference to first aspect present invention, in first aspect present invention second embodiment, the NAT device is according to the use The IP information of family equipment, the downlink data is sent to the second forwarding capability component, including：

The NAT device is searched and the use according to the IP information of the user equipment from the forwarding capability component The corresponding second forwarding capability component of IP information of family equipment；

The NAT device sends to the second forwarding capability component the downlink data.

Due to NAT device play a part of be up-downgoing data shunting routing function, substantially according to different The IP information of user equipment is classified, for example, continuous multiple IP information is used as a subnet network segment, the road of each subnet By to a forwarding capability component, so as to data forwarding be gone out, then, the IP information according to user equipment determines that user sets The subnet network segment residing for standby IP, then finds forwarding capability component corresponding with the subnet network segment, and the forwarding capability component is just It is the second forwarding capability component, NAT device downlink data is sent to the second forwarding capability component having determined, is set in NAT During back-up stream downlink data, equally also without distributor.

With reference to first aspect present invention, in the implementation method of first aspect present invention the 3rd, the upstream data includes described The IP information of user equipment,

The NAT device sends to service network the upstream data, and receives the service network according to The downlink data of upstream data feedback, the downlink data includes the IP information of the service network, including：

The IP information of user equipment described in the upstream data is converted to the NAT device IP letters of service network Breath；

The NAT device is sent to the service network upstream data according to the IP information of the service network；

The NAT device receives the downlink data that the service network feeds back according to the upstream data, described descending Data include the IP information of the service network.

When upstream data is sent to service network by NAT device, in addition it is also necessary in view of the problem of the IP bags of upstream data, IP Bag is generated according to the IP information of user equipment, and service network is processed upstream data, is actually also intended to pass through What virtual machine or entity apparatus were realized, therefore be also required in the service network with IP information, NAT device can successfully by Upstream data is sent to service network and also has the important step to be exactly：The IP information of user equipment is converted into service network IP information；Therefore NAT device is converted to the IP information of the user equipment in upstream data after upstream data is got The IP information of service network, the IP information translative mode of NAT device pre-sets, obtain service network IP information it Afterwards, NAT device sends to service network upstream data, and service network is received after upstream data, and upstream data is carried out Downlink data is obtained after treatment, downlink data needs to feed back to the user equipment for sending upstream data, because NAT device is received Downlink data be service network send, then downlink data certainly include the IP information of service network.

With reference to first aspect present invention, first aspect first embodiment, first aspect second embodiment or first party The implementation method of face the 3rd, in the implementation method of first aspect present invention the 4th, the asymmetric separate system also includes LB,

Before the first forwarding capability component obtains the upstream data of user equipment, also include：

The LB obtains the upstream data of user equipment by access network equipment；

The first forwarding capability component in LB forwarding capability components according to preset shunting table or random determination；

The LB sends to the first forwarding capability component the upstream data.

The upstream data that user equipment sends can be sent to LB by access network equipment (such as base station), and one is saved in LB The shunting table Table of dynamic change, its basic structure is (key, value).The value of the foundation key of shunting can be by different algorithms Configured, corresponding value values are corresponding forwarding capability components；Or, shunt table in without record when, for example certain Key values are for the first time when occurring, then distribution forwarding capability component that can also be random；Or, according to preset specified strategy, specify Certain specific forwarding capability component can also, do not limit specifically.

With reference to the implementation method of first aspect present invention the 4th, in the implementation method of first aspect present invention the 5th, described first Forwarding capability component obtains the upstream data of user equipment, and the upstream data is sent to the NAT device, including：

First forwarding capability component receives the upstream data of the user equipment that the LB sends, and the upstream data is data Bag form；

The first forwarding capability component determines whether there is the user conversation of the user equipment；

If so, then the first forwarding capability component sends to the NAT device upstream data；

If it is not, then conversation management functional component described in the first forwarding capability component accesses, determines the session management User conversation of the functional unit with the presence or absence of the user equipment；

If there is the user conversation of the user equipment, the first forwarding capability group in the conversation management functional component Part obtains the user conversation of the user equipment in the conversation management functional component, and the upstream data is sent to institute State NAT device；

If the conversation management functional component is in the absence of the user conversation of the user equipment, first forwarding capability Component deletes the upstream data.

First forwarding capability component is received after upstream data, before sending it to NAT device, the first forwarding capability Component needs to decode the upstream data of data packet format, it is generally the case that if user conversation is established, and first The user conversation known to forwarding capability component, then can decode that the upstream data, therefore, the first forwarding capability component is received Row data, if it is possible to decode upstream data, then it represents that there is the user conversation of user equipment, the first forwarding capability component will be upper Row data is activation is to NAT device；By the effect that existing conversation management functional component has includes the management of user conversation, There may exist user equipment and first have sent upstream data, before the first forwarding capability component forwarding uplink data, Yong Hushe It is standby to have carried out cell switching, then user conversation there occurs change, the user after conversation management functional component known variant Session, but the first forwarding capability component is not known, so as to upstream data cannot be decoded.If the first forwarding capability component is not deposited In the user conversation of user equipment, then the first forwarding capability component accesses conversation management functional component, if conversation management functional group There is the user conversation of user equipment in part, then the first forwarding capability component obtains the user equipment in conversation management functional component User conversation, and upstream data is sent to NAT device；If conversation management functional component is also in the absence of user's meeting of user equipment Words, then it represents that the already off user conversation of user equipment, and do not set up new user conversation, then upstream data is mistake Packet, the first forwarding capability component of general processing mode deletes upstream data, using other modes can also, do not limit It is fixed.

Second aspect present invention provides a kind of asymmetric separate system, including：

First forwarding capability component, the upstream data for obtaining user equipment, and the upstream data is sent to net Network address conversion NAT device；

The NAT device, for the upstream data to be sent to service network, and receive the service network according to The downlink data of the upstream data feedback, the downlink data includes the procotol IP information of the service network；

The NAT device, is additionally operable to for the IP information of service network described in the downlink data to be converted to the user The IP information of equipment；

The NAT device, is additionally operable to the IP information according to the user equipment, and the downlink data is sent to second turn Hair functional unit；

The second forwarding capability component, for determining the user equipment correspondence according to the IP information of the user equipment Target access network equipment, and the downlink data is sent to the target access network equipment.

With reference to second aspect present invention, in second aspect present invention first embodiment, the system also includes：Session pipe Reason functional unit；

The conversation management functional component, the user conversation for recording the user equipment；

The second forwarding capability component, is additionally operable to the session management work(according to the IP message references of the user equipment Energy component, obtains the user conversation of the user equipment；

The second forwarding capability component, is additionally operable to the user conversation according to the user equipment, it is determined that with the user Equipment sets up the target access network equipment of communication connection；

With reference to second aspect present invention, in second aspect present invention second embodiment,

The NAT device, is additionally operable to the IP information according to the user equipment, from the forwarding capability component search with The corresponding second forwarding capability component of IP information of the user equipment；

The NAT device, is additionally operable to send the downlink data to the second forwarding capability component.

Due to NAT device play a part of be up-downgoing data shunting routing function, substantially according to different The IP information of user equipment is classified, for example, continuous multiple IP information is used as a subnet network segment, the road of each subnet By to a forwarding capability component, so as to data forwarding be gone out, then, the IP information according to user equipment just can determine that the Downlink data is sent to the second forwarding capability component by two forwarding capability components, NAT device, and downlink data is shunted in NAT device When, equally also without distributor.

With reference to second aspect present invention, in the implementation method of second aspect present invention the 3rd, the upstream data includes described The IP information of user equipment,

The NAT device, is additionally operable to for the IP information of user equipment described in the upstream data to be converted to service network IP information；

The NAT device, is additionally operable to be sent to the clothes upstream data according to the IP information of the service network Business network；

The NAT device, is additionally operable to receive the downlink data that the service network feeds back according to the upstream data, institute State IP information of the downlink data including the service network.

With reference to second aspect present invention, second aspect first embodiment, second aspect second embodiment or second party In the implementation method of face the 3rd, in the implementation method of second aspect present invention the 4th, the system also includes：Load equalizer LB；

The LB, the upstream data for obtaining user equipment by access network equipment；

The LB, is additionally operable to the first forwarding work(in the forwarding capability component according to preset shunting table or random determination Can component；

The LB, is additionally operable to send the upstream data to the first forwarding capability component.

With reference to the implementation method of second aspect present invention the 4th, in the implementation method of second aspect present invention the 5th,

The first forwarding capability component, is additionally operable to receive the upstream data of the user equipment that the LB sends, it is described on Row data are data packet format；

The first forwarding capability component, is also used to determine whether there is the user conversation of the user equipment；

The first forwarding capability component, is additionally operable to when there is the user conversation of the user equipment, will be described up Data is activation is to the NAT device；

The first forwarding capability component, is additionally operable to, when the user conversation in the absence of the user equipment, access described Conversation management functional component, determines user conversation of the conversation management functional component with the presence or absence of the user equipment；

The first forwarding capability component, is additionally operable to the use that there is the user equipment when the conversation management functional component During the session of family, the user conversation of the user equipment in the conversation management functional component is obtained, and by the upstream data Send to the NAT device；

The first forwarding capability component, is additionally operable to when the conversation management functional component is in the absence of the user equipment During user conversation, the upstream data is deleted.

Brief description of the drawings

Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to institute in embodiment and description of the prior art The accompanying drawing for needing to use is briefly described.

Fig. 1 is the data transfer path schematic diagram of existing symmetrical flow division system；

The data transfer path schematic diagram of the asymmetric separate system that Fig. 2 is provided for the application；

The Attach flow signalling diagrams that Fig. 3 is provided for the application；

The schematic flow sheet of the one embodiment for the data transmission method that Fig. 4 is provided for the application；

The data transfer path schematic diagram of one specific embodiment of the data transmission method that Fig. 5 is provided for the application；

The structural representation of the one embodiment for the asymmetric separate system that Fig. 6 is provided for the application；

The structural representation of another embodiment of the asymmetric separate system that Fig. 7 is provided for the application.

Specific embodiment

Below in conjunction with the accompanying drawing in the application, the technical scheme in the application is clearly and completely described.

The system architecture or scene for introducing present invention application simple first.

It is existing EPC is virtualized based on NFV standard booms, by the composition such as MME, SGW, HSS and PGW in EPC VNF, after the completion of the chain of command attachment flow (Attach) of EPC, the empty port load-supporting of VNF is set up, and EPS is carried and set up therewith, is connect Data transmission tunnel between log equipment and SGW and PGW is set up.NFV standard architectures are divided into service and management two large divisions.In clothes Business aspect is broadly divided into three layers：I layers (Infrastructure as a Service, Iaas), P layers of (Platform as a Service, Paas) and S layers (Software as a Service, Saas).The resource of I layers of offer is virtual machine, storage and net The resources such as network, the P layers of development deployment platform for providing application, S layers is provided application and is mainly supplied to Web latticed forms User.And the present invention says that the scheme being related to mainly is implemented at I layers.

As shown in Fig. 2 user equipment (UE) by access network equipment (such as base station eNB) access telecommunications network or or MME and HSS is identical with the Network Element Function in existing 3GPP standards, it is necessary to explanation, only gives in Fig. 2 in Internet, Fig. 2 Go out a UE and eNB as an example, in actual applications in the presence of multiple.

Load equalizer (Load Balance, LB) carry is data surface treatment cluster.ENB can send user equipment Upstream data be sent to LB, save a shunting table Table for dynamic change in LB, its basic structure be (key, value).The value of the foundation key of shunting can be configured by different algorithms, and corresponding value values are often corresponding gateway IP information, it is that the data traffic of upstream data is equally distributed into follow-up gateway to shunt the result for producing, it is ensured that each gateway Load balance.And downlink data then requires no LB, gone directly eNB, and a LB is only given in Fig. 2 as an example, actually should In the case of with middle a large number of users scale, the performance of single LB is difficult to support, and is usually extended using multiple LB.When UE connects When entering eNB, as other flows are with single LB such as Attach flows and data access service etc. in addition to switching.

Conversation management functional component is the network entity after the function merger and reorganization of SGW and PGW, usually with virtual machine The mode of one component is presented, and conversation management functional component is the session management entity of SGW and PGW, is responsible for being created with MME interactions The session of user is built, changes and deletes, while forwarding capability component can also be configured, when using up-downgoing data transfer During separation, conversation management functional component can respectively match somebody with somebody according to the demand in up-downgoing path to different forwarding capability components Put, specifically foundation and modification on user conversation etc. is operated shown in signaling process figure as shown in Figure 3.

Forwarding capability component is the forwarding capability of data surface, and it maintains two (key, value) tables, structure for (teid, Session_u) and (ip, session_d), session_u is used for upstream data correspondence user conversation lookup treatment, session_ D is used for the lookup treatment of downlink data correspondence user conversation, if do not exist user conversation in (key, value) table, such as Fig. 3 Shown, forwarding capability component can obtain the user conversation of the new structure of record with access session management function component.In Fig. 2 only The first forwarding capability component and the second forwarding capability component are given, more than two forwarding work(are there may be in actual applications Energy component, each forwarding capability component corresponds to one or more subnets.

The effect of NAT device is the shunting routing function of upstream data and downlink data.One IP of each route correspondence Subnet section, an IP information of the IP subnets section comprising multiple user equipmenies, such as the IP information of UE is in subnet 2 in Fig. 2, Internet resources abundance in the case of, nat feature is not necessary, but it is existing in the case of, number of users is huge, and network can IP resources are in short supply.

The data transmission method being applied in said system framework or scene is illustrated below by embodiment.

Fig. 4 is referred to, the embodiment of the present invention provides a kind of data transmission method, including：

401st, the first forwarding capability component obtains the upstream data of user equipment, and upstream data is sent to NAT device；

In the present embodiment, the first forwarding capability component can get the upper line number of the user equipment that base station reports by LB There may be number of user equipment in multiple, and the cell of base station covering in the range of base station can bear according to, base station, The quantity of specific user equipment is not limited, and the upstream data of the user equipment that will be got is sent in NAT device.

402nd, NAT device sends to service network upstream data, and receives service network according to upstream data feedback Downlink data；

In the present embodiment, NAT device receive the first forwarding capability component transmission upstream data after, by upper line number According to being sent to service network, in specific transmission process, to consider upstream data to be asked or the service needs realized and Corresponding service network is corresponded to, for example, the upstream data of bank transfer service needs to be sent to the banking network of associated bank In, corresponding transmission is carried out generally by the service identifiers in upstream data in the prior art, concrete condition is not done specifically It is bright, after service network receives upstream data, upstream data can be fed back, NAT device receives service network root According to the downlink data that upstream data feeds back, because the equipment in different network segments is with different IP information, then under Naturally the IP information of service network is included in row data.

403rd, the IP information of service network in downlink data is converted to NAT device the IP information of user equipment；

In the present embodiment, NAT device is received after downlink data, in addition it is also necessary to which downlink data is sent into user equipment In, from downlink data can only terminal service network IP information, then in the case of the IP information of user equipment cannot be determined, be Downlink data cannot be sent in user equipment, it is necessary to which the IP information of service network is converted to the IP letters of user equipment Breath, specific transfer process is the transformation rule for pre-setting, and existing NAT technologies are to be capable of achieving.

404th, NAT device is sent to the second forwarding capability component downlink data according to the IP information of user equipment；

In the present embodiment, NAT device can determine which son downlink data is needed by according to the IP information of user equipment Net is transmitted, and when forwarding capability component is set, a subnet network segment generally corresponds to a forwarding capability component, therefore, root According to the IP information of user equipment, downlink data is sent to the second forwarding capability component.

405th, the second forwarding capability component determines the corresponding target access network of user equipment according to the IP information of user equipment Equipment, and downlink data is sent to target access network equipment.

In the present embodiment, because the second forwarding capability component is stored with the user conversation of user equipment in itself, or pass through Other modes (such as access session management function component) can obtain the user conversation of the user equipment, then be set according to user Standby IP information can be to determine that the user equipment is in the cell where which base station, then determine user equipment pair After the target BS (i.e. target access network equipment) answered, downlink data is sent to target BS, base station is by under downlink data It is sent to user equipment.

In the embodiment of the present invention, downlink data is that forwarding capability group is sent to from NAT device during transmission Downlink data is directly sent to part, forwarding capability component the access network equipment of user equipment affiliated subdistrict again, with prior art Compare, downlink data needs not move through distributor and retransmits to access network equipment, so as to during reducing downlink data transmission Time loss；And the reduction of distributor can save virtual machine cost.

It should be noted that when forwarding capability component is set, a subnet network segment generally corresponds to a forwarding capability group Part, NAT device needs the subnet network segment according to residing for the IP information of user equipment, so as to downlink data is routed into corresponding turn Hair functional unit, such way can reduce the routing pressure of asymmetric separate system.If each forwarding capability component Or the corresponding route of each user equipment, then route quantity will be very huge, and be provided with a forwarding capability Component one subnet network segment of correspondence, and by the information record of forwarding capability component and the corresponding subnet network segment in the routing table, Asymmetric separate system is capable of the route of the user equipment of the numerous different IP information of quantity performed according to the routing table of record.

Optionally, in some embodiments of the present invention, asymmetric separate system also includes conversation management functional component,

Second forwarding capability component determines the corresponding target access network equipment of user equipment according to the IP information of user equipment, And send to target access network equipment downlink data, including：

Second forwarding capability component obtains user equipment according to the IP message reference conversation management functional components of user equipment User conversation；

Second forwarding capability component is according to the user conversation of user equipment, it is determined that setting up the mesh of communication connection with user equipment Tag splice log equipment；

Second forwarding capability component sends to target access network equipment downlink data so that target access network equipment is by under Row data is activation is to user equipment.

In the embodiment of the present invention, conversation management functional component, conversation management functional group are also included in asymmetric separate system Part is the session management entity of SGW and PGW, is responsible for the session for creating, changing and delete user with MME interactions, therefore, second Forwarding capability component can obtain user's meeting of user equipment according to the IP message reference conversation management functional components of user equipment Words, the target access network equipment that communication connection is set up with user equipment is can determine according to user conversation, that is, determine user equipment In cell in target BS, the second forwarding capability component need to be only sent to target access network equipment, target downlink data Downlink data just can be issued to user equipment by access network equipment by communication link.Detailed explaining does not need distributor, Also data is activation to user equipment will can accurately be issued.

Optionally, in some embodiments of the present invention, NAT device sends out downlink data according to the IP information of user equipment The second forwarding capability component is delivered to, including：

NAT device searches the IP information pair with user equipment according to the IP information of user equipment from forwarding capability component The the second forwarding capability component answered；

NAT device sends to the second forwarding capability component downlink data.

In the embodiment of the present invention, due to NAT device play a part of be up-downgoing data shunting routing function, substantially Exactly classified according to the IP information of different user equipmenies, for example, continuous multiple IP information is used as a subnet network segment, Each subnet routes to a forwarding capability component, so as to data forwarding be gone out, then, the IP letters according to user equipment Breath, just can determine that the second forwarding capability component, and downlink data is sent to the second forwarding capability component by NAT device, in NAT device During shunting downlink data, equally also without distributor.

Optionally, in some embodiments of the present invention, upstream data includes the IP information of user equipment,

NAT device sends to service network upstream data, and receives service network according under upstream data feedback Row data, downlink data includes the IP information of service network, including：

The IP information of user equipment in upstream data is converted to NAT device the IP information of service network；

NAT device is sent to service network upstream data according to the IP information of service network；

NAT device receives the downlink data that service network feeds back according to upstream data, and downlink data includes service network IP information.

In the embodiment of the present invention, when upstream data is sent to service network by NAT device, in addition it is also necessary in view of upstream data IP bags problem, IP bags are generated according to the IP information of user equipment, and service network is processed upstream data, real It is also intended to what is realized by virtual machine or entity apparatus on border, therefore is also required in the service network with IP information, NAT sets It is standby upstream data to be successfully sent to service network and also have the important step to be exactly, by the IP information of user equipment The IP information of service network is converted to, NAT device receives the downlink data that service network feeds back according to upstream data, lower line number According to the IP information including service network.

Optionally, in some embodiments of the present invention, asymmetric separate system also includes LB,

Before first forwarding capability component obtains the upstream data of user equipment, also include：

LB obtains the upstream data of user equipment by access network equipment；

First forwarding capability components of the LB in preset shunting table or random determination forwarding capability component；

LB sends to the first forwarding capability component upstream data.

Optionally, in some embodiments of the present invention, the first forwarding capability component obtains the upstream data of user equipment, and Upstream data is sent to NAT device, including：

First forwarding capability component receives the upstream data of the user equipment that LB sends, and upstream data is data packet format；

First forwarding capability component determines whether there is the user conversation of user equipment；

If so, then the first forwarding capability component sends to NAT device upstream data；

If it is not, whether then the first forwarding capability component accesses conversation management functional component, determine conversation management functional component There is the user conversation of user equipment；

If conversation management functional component has the user conversation of user equipment, the first forwarding capability component obtains session pipe The user conversation of the user equipment in reason functional unit, and upstream data is sent to NAT device；

If conversation management functional component is deleted up in the absence of the user conversation of user equipment, the first forwarding capability component Data.

In the embodiment of the present invention, the first forwarding capability component is received after upstream data, send it to NAT device it Before, the first forwarding capability component needs to decode the upstream data of data packet format, if it is possible to decode upstream data, then There is the user conversation of user equipment in expression, the first forwarding capability component sends to NAT device upstream data；If there is no The user conversation of user equipment, then the first forwarding capability component accesses conversation management functional component, if conversation management functional component There is the user conversation of user equipment, then the first forwarding capability component obtains the use of the user equipment in conversation management functional component Family session, and upstream data is sent to NAT device；If conversation management functional component is in the absence of the user conversation of user equipment, Then upstream data is wrong data bag, and the first forwarding capability component of general processing mode deletes upstream data, using other Mode can also, do not limit.

Above example is illustrated to the data transmission method for being applied to asymmetric separate system, below by specific Embodiment illustrate, it is as follows：

As shown in figure 5, under NFV scenes, a small amount of userbase (<Implement scene 20W), it is assumed that the network of access is Internet, LB, conversation management functional component GW_C, three forwarding capability component GW_PF3 and a NAT device, its He completes functional realiey by network element with virtual machine.

1st, according to virtual machine specification and number of users scale and customer flow expection, start the virtual machine of reasonable number VNF completes MME, HSS, GW_C, forwarding capability component GW_PF, LB and the configuration of NAT device.Divide including subnet route, IP IP and corresponding port numbers with management and each network element etc.；

2nd, the related Business Processing process of MME, HSS, GW_C and GW_PF is started；

3rd, mobile phone presses Attach flows and accesses eNB1, it is assumed that the IP information that GW_C distributes to mobile phone is 192.168.0.2, Teid is 3；

4th, when mobile phone 1 carries out data access, its packet is shunted by LB.Because being first packet, it is assumed that adopt What is taken is uniformly random strategy, and be assigned on GW_PF2 for it by LB, then the IP of GW_PF2 is saved in table, it is assumed that corresponding Key is the teid of GW_C distribution, and table is (teid, GW_PF_IP), and each packet of mobile phone 1 can be assigned to GW_PF2 later On；

5th, GW_PF2 forwards the data to NAT, and NAT is converted to the packet of the IP information " 192.168.0.2 " of mobile phone The packet of public network IP information " 221.220.128.127 ".The data that internet is returned are converted to IP information by NAT again “192.168.0.2”.It is assumed that the data of subnet 192.168.0.x/24 are routed to GW_PF3 by NAT, then GW_PF3 can start hand , be forwarded directly to data in corresponding base station eNB 1 according to session information then by machine session rebuilding；

6th, when a large amount of mobile phones are accessed, if corresponding GW_PF1 overloads and GW_PF2 on some subnet subNet1 When load is very light, two Net1/Net2 can be split as, the corresponding GW_PF1 that are routed to of Net1 are constant, and Net2 correspondences are routed to On GW_PF2, the other parts of system need not do additional configuration.

It should be noted that when mobile phone switching (Handover), its data surface session need not be migrated.

(1) signaling of chain of command according to similar Attach flows processing procedure, either X2 switching or S1 switching, all It is that the information for sending the new base station that ModifyBearerRequest connects mobile phone by MME is sent to GW_C, then changes The associated session on all GW_PF where correspondence mobile phone session.

(2) after the completion of switching flow, when mobile phone is switched to another base station from a base station, its upstream data stream is by LB When, its key value teid is same, thus can be routed the data on same GW, and route for data by GW when descending To the base station that mobile phone is currently connected.Business is not interrupted during above flow ensure that mobile phone handoff procedure, and session is not migrated.

If in the case of a large number of users scale, when the performance of single LB is difficult to support, be extended using multiple LB. When mobile phone access base station, as other flows are with single LB such as Attach flows, data access business etc. in addition to switching. Switching is divided into two kinds：Switch between switching and LB clusters in LB clusters.Switching in LB clusters：Attach of the mobile phone in LB clusters and Switching flow has no change.Switch between LB clusters：When mobile phone is switched to another cluster LB2 from a cluster LB1, it is not necessary to Operation bidirectional, LB2 is added on the GW_PF that a new route is forwarded the data in its cluster automatically by assignment algorithm.With mark Quasi- operation is the same, if not having the session of this mobile phone in GW_PF, GW_PF reads session to be rebuild from GW_C, up-downgoing GW_PF on path can automatic Reconstruction user conversation.GW_PF is to reporting position in GW_C.

Above example is illustrated to data transmission method, and asymmetric separate system is carried out below by embodiment Explanation.

Fig. 6 is referred to, the embodiment of the present invention provides a kind of asymmetric separate system, including：

First forwarding capability component 601, the upstream data for obtaining user equipment, and upstream data is sent to network Address conversion NAT device；

NAT device 602, for upstream data to be sent to service network, and receives service network according to upstream data The downlink data of feedback, downlink data includes the procotol IP information of service network；

NAT device 602, is additionally operable to be converted to the IP information of service network in downlink data the IP information of user equipment；

NAT device 602, is additionally operable to the IP information according to user equipment, and downlink data is sent to the second forwarding capability group Part；

Second forwarding capability component 603, for determining that the corresponding target of user equipment connects according to the IP information of user equipment Log equipment, and downlink data is sent to target access network equipment.

In the embodiment of the present invention, compared with prior art, downlink data needs not move through distributor and retransmits to access network and sets It is standby, so as to reduce the time loss during downlink data transmission；And the reduction of distributor can save virtual machine cost.

Optionally, as shown in fig. 7, in some embodiments of the present invention, system also includes：Conversation management functional component 604；

Conversation management functional component 604, the user conversation for recording user equipment；

Second forwarding capability component 603, is additionally operable to the IP message reference conversation management functional components according to user equipment 604, obtain the user conversation of user equipment；

Second forwarding capability component 603, is additionally operable to the user conversation according to user equipment, it is determined that setting up logical with user equipment Believe the target access network equipment of connection；

Second forwarding capability component 603, is additionally operable to send downlink data to target access network equipment so that target is accessed Net equipment sends to user equipment downlink data.

In the embodiment of the present invention, conversation management functional component 604 is the session management entity of SGW and PGW, is responsible for and MME The interactive session to create, change and delete user, therefore, IP information of the second forwarding capability component 603 according to user equipment Access session management function component 604 can obtain the user conversation of user equipment, be can determine according to user conversation and user Equipment sets up the target access network equipment of communication connection, that is, determine that user equipment is in the cell of target BS, the second forwarding Functional unit 603 need to be only sent to target access network equipment downlink data, and target access network equipment just can pass through communication link Downlink data is issued to user equipment.Detailed explaining does not need distributor, can accurately will issue data is activation yet and arrive User equipment.

Optionally, in some embodiments of the present invention,

NAT device 602, is additionally operable to the IP information according to user equipment, is searched and user equipment from forwarding capability component The corresponding second forwarding capability component of IP information；

NAT device 602, is additionally operable to send downlink data to the second forwarding capability component.

In the embodiment of the present invention, due to NAT device 602 play a part of be up-downgoing data shunting routing function, it is real It is exactly to be classified according to the IP information of different user equipmenies in matter, for example, continuous multiple IP information is used as a subnet The network segment, each subnet routes to a forwarding capability component, so as to data forwarding be gone out, then, according to user equipment IP information, just can determine that the second forwarding capability component 603, downlink data is sent to the second forwarding capability group by NAT device 602 Part 603, when NAT device 602 shunts downlink data, equally also without distributor.

NAT device 602, is additionally operable to be converted to the IP information of user equipment in upstream data the IP information of service network；

NAT device 602, is additionally operable to be sent to service network upstream data according to the IP information of service network；

NAT device 602, is additionally operable to receive the downlink data that service network feeds back according to upstream data, downlink data packet Include the IP information of service network.

In the embodiment of the present invention, when upstream data is sent to service network by NAT device 602, in addition it is also necessary in view of up The problem of the IP bags of data, IP bags be according to the IP information of user equipment generate, and service network to upstream data at Reason, is actually also intended to what is realized by virtual machine or entity apparatus, therefore is also required in the service network with IP information, Upstream data successfully can be sent to service network and also have the important step to be exactly by NAT device 602, by user equipment IP information be converted to the IP information of service network, NAT device 602 receive service network according to upstream data feed back it is descending Data, downlink data includes the IP information of service network.

Optionally, as shown in fig. 7, in some embodiments of the present invention, system also includes：Load equalizer LB605；

LB605, the upstream data for obtaining user equipment by access network equipment；

LB605, is additionally operable to the first forwarding capability group in preset shunting table or random determination forwarding capability component Part 601；

LB605, is additionally operable to send upstream data to the first forwarding capability component 601.

In the embodiment of the present invention, can be sent to for the upstream data that user equipment sends by access network equipment (such as base station) A shunting table Table for dynamic change is saved in LB605, LB605, its basic structure is (key, value).Shunting according to Can be configured by different algorithms according to the value of key, corresponding value values are corresponding forwarding capability components；Or, in shunting When in table without record, such as certain key value first time is when occurring, then distribution forwarding capability component that can also be random；Or, According to preset specified strategy, specify certain specific forwarding capability component can also, do not limit specifically.

Optionally, as shown in fig. 7, in some embodiments of the present invention,

First forwarding capability component 601, is additionally operable to receive the upstream data of the user equipment that LB605 sends, upstream data It is data packet format；

First forwarding capability component 601, is also used to determine whether the user conversation that there is user equipment；

First forwarding capability component 601, is additionally operable to when there is the user conversation of user equipment, by upstream data send to NAT device 602；

First forwarding capability component 601, is additionally operable to when the user conversation in the absence of user equipment, access session management work( Energy component 604, determines user conversation of the conversation management functional component with the presence or absence of user equipment；

First forwarding capability component 601, is additionally operable to when the user conversation that conversation management functional component has user equipment, The user conversation of the user equipment in conversation management functional component 604 is obtained, and upstream data is sent to NAT device 602；

First forwarding capability component 601, is additionally operable to the user's meeting in the absence of user equipment when conversation management functional component 604 During words, upstream data is deleted.

In the embodiment of the present invention, the first forwarding capability component 601 is received after upstream data, is sent it to NAT and is set Before standby 602, the first forwarding capability component 601 needs to decode the upstream data of data packet format, if it is possible to decode Upstream data, then it represents that there is the user conversation of user equipment, the first forwarding capability component 601 sends to NAT upstream data Equipment 602；If there is no the user conversation of user equipment, then the access session management function group of the first forwarding capability component 601 Part 604, if conversation management functional component 604 has the user conversation of user equipment, the first forwarding capability component 601 obtains meeting The user conversation of the user equipment in words management function component 603, and upstream data is sent to NAT device 602；If session pipe In the absence of the user conversation of user equipment, then upstream data is wrong data bag to reason functional unit 604, general processing mode First forwarding capability component 601 delete upstream data, using other modes can also, do not limit.

It should be understood that in various embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to that execution is suitable The priority of sequence, the execution sequence of each process should be determined with its function and internal logic, without the implementation of the reply embodiment of the present invention Process constitutes any restriction.

The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to preceding Embodiment is stated to be described in detail the application, it will be understood by those within the art that：It still can be to preceding State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these Modification is replaced, and does not make the scope of essence disengaging each embodiment technical scheme of the application of appropriate technical solution.

Claims

1. a kind of data transmission method, is applied to asymmetric separate system, and the asymmetric separate system includes at least two turns Hair functional unit and network address translation device, it is characterised in that including：

First forwarding capability component obtains the upstream data of user equipment, and the upstream data is sent to the NAT device；

The NAT device sends to service network the upstream data, and receives the service network according to described up The downlink data of data feedback, the downlink data includes the procotol IP information of the service network；

The IP information of service network described in the downlink data is converted to the NAT device IP letters of the user equipment Breath；

The NAT device is sent to the second forwarding capability component the downlink data according to the IP information of the user equipment；

The second forwarding capability component determines that the corresponding target of the user equipment connects according to the IP information of the user equipment Log equipment, and the downlink data is sent to the target access network equipment.

2. data transmission method according to claim 1, it is characterised in that the asymmetric separate system also includes session Management function component,

The second forwarding capability component determines that the corresponding target of the user equipment connects according to the IP information of the user equipment Log equipment, and the downlink data is sent to the target access network equipment, including：

Second forwarding capability component conversation management functional component according to the IP message references of the user equipment, obtains The user conversation of the user equipment；

The second forwarding capability component is according to the user conversation of the user equipment, it is determined that set up with the user equipment communicating The target access network equipment of connection；

The second forwarding capability component sends to the target access network equipment downlink data so that the target connects Log equipment sends to the user equipment downlink data.

3. data transmission method according to claim 1, it is characterised in that the NAT device is according to the user equipment IP information, the downlink data is sent to the second forwarding capability component, including：

The NAT device is searched from the forwarding capability component and set with the user according to the IP information of the user equipment The corresponding second forwarding capability component of standby IP information；

4. data transmission method according to claim 1, it is characterised in that the upstream data includes the user equipment IP information,

The NAT device sends to service network the upstream data, and receives the service network according to described up The downlink data of data feedback, the downlink data includes the IP information of the service network, including：

The IP information of user equipment described in the upstream data is converted to the NAT device IP information of service network；

The NAT device receives the downlink data that the service network feeds back according to the upstream data, the downlink data IP information including the service network.

5. data transmission method according to any one of claim 1 to 4, it is characterised in that the asymmetric shunting system System also includes load equalizer LB,

The LB sends to the first forwarding capability component the upstream data.

6. data transmission method according to claim 5, it is characterised in that the first forwarding capability component obtains user The upstream data of equipment, and the upstream data is sent to the NAT device, including：

First forwarding capability component receives the upstream data of the user equipment that the LB sends, and the upstream data is packet lattice Formula；

If it is not, then conversation management functional component described in the first forwarding capability component accesses, determines the conversation management functional User conversation of the component with the presence or absence of the user equipment；

If the conversation management functional component has the user conversation of the user equipment, the first forwarding capability component is obtained Take the user conversation of the user equipment in the conversation management functional component, and the upstream data is sent to described NAT device；

If the conversation management functional component is in the absence of the user conversation of the user equipment, the first forwarding capability component Delete the upstream data.

7. a kind of asymmetric separate system, it is characterised in that including：

First forwarding capability component, the upstream data for obtaining user equipment, and the upstream data is sent to network ground Change NAT device in location；

The NAT device, for the upstream data to be sent to service network, and receives the service network according to The downlink data of upstream data feedback, the downlink data includes the procotol IP information of the service network；

The NAT device, is additionally operable to for the IP information of service network described in the downlink data to be converted to the user equipment IP information；

The NAT device, is additionally operable to the IP information according to the user equipment, and the downlink data is sent to the second forwarding work( Can component；

The second forwarding capability component, for determining the corresponding mesh of the user equipment according to the IP information of the user equipment Tag splice log equipment, and the downlink data is sent to the target access network equipment.

8. asymmetric separate system according to claim 7, it is characterised in that the system also includes：Session management work( Can component；

The second forwarding capability component, is additionally operable to the conversation management functional group according to the IP message references of the user equipment Part, obtains the user conversation of the user equipment；

The second forwarding capability component, is additionally operable to the user conversation according to the user equipment, it is determined that with the user equipment Set up the target access network equipment of communication connection；

The second forwarding capability component, is additionally operable to send the downlink data to the target access network equipment so that institute Target access network equipment is stated to send to the user equipment downlink data.

9. asymmetric separate system according to claim 7, it is characterised in that

The NAT device, is additionally operable to the IP information according to the user equipment, searched from the forwarding capability component with it is described The corresponding second forwarding capability component of IP information of user equipment；

10. asymmetric separate system according to claim 7, it is characterised in that the upstream data includes the user The IP information of equipment,

The NAT device, is additionally operable to be converted to the IP information of user equipment described in the upstream data IP of service network Information；

The NAT device, is additionally operable to be sent to the service network upstream data according to the IP information of the service network Network；

The NAT device, is additionally operable to receive the downlink data that the service network feeds back according to the upstream data, it is described under Row data include the IP information of the service network.

The 11. asymmetric separate system according to any one of claim 7 to 10, it is characterised in that the system is also wrapped Include：Load equalizer LB；

The LB, is additionally operable to the first forwarding capability group in the forwarding capability component according to preset shunting table or random determination Part；

12. asymmetric separate systems according to claim 11, it is characterised in that

The first forwarding capability component, is additionally operable to receive the upstream data of the user equipment that the LB sends, the upper line number According to being data packet format；

The first forwarding capability component, is additionally operable to when there is the user conversation of the user equipment, by the upstream data Send to the NAT device；

The first forwarding capability component, is additionally operable to, when the user conversation in the absence of the user equipment, access the session Management function component, determines user conversation of the conversation management functional component with the presence or absence of the user equipment；

The first forwarding capability component, is additionally operable to the user's meeting that there is the user equipment when the conversation management functional component During words, the user conversation of the user equipment in the conversation management functional component is obtained, and the upstream data is sent To the NAT device；

The first forwarding capability component, is additionally operable to the user in the absence of the user equipment when the conversation management functional component During session, the upstream data is deleted.