CN106412148A - EPDG selecting method and device - Google Patents
EPDG selecting method and device Download PDFInfo
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- CN106412148A CN106412148A CN201611136525.3A CN201611136525A CN106412148A CN 106412148 A CN106412148 A CN 106412148A CN 201611136525 A CN201611136525 A CN 201611136525A CN 106412148 A CN106412148 A CN 106412148A
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- epdg
- domain name
- address
- access network
- terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/45—Network directories; Name-to-address mapping
- H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
- H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
The invention relates to the communication technology field and discloses an ePDG selecting method and device, which can improve the ePDG selection accuracy without increasing the external signaling overhead and time delay when a terminal accesses an EPC network via an untrusted WLAN. The method comprises the steps of: receiving a domain name resolution request sent by a terminal, wherein the domain name resolution request carries an initial domain name and access network information of the terminal; searching for location information corresponding to the access network information in a correspondence table, wherein the correspondence table is used to indicate the corresponding relationship between the access network information and the location information; determining an IP address of an ePDG based on the initial domain name and the location information, transmitting the IP address of the ePDG to the terminal, and therefore conveniently selecting the ePDG by the terminal according to the IP address of the ePDG. The ePDG selecting method and device of the present invention are applicable to the process of selecting an ePDG.
Description
Technical field
The present invention relates to communication technical field, more particularly, to a kind of method and device of selection ePDG.
Background technology
With the development of the communication technology, EPC (English：Evolved Packet Core, Chinese：The block core of evolution)
Network is used widely.Terminal is appointing WLAN (English by untrusted：Wireless Local Area Networks, in
Literary composition：WLAN) access EPC network when, need by ePDG (English：Evolved Packet Data Gateway,
Chinese：Evolution packet data gateway) (English with PDN GW：Packet Data Network Gateway, Chinese：Grouped data
Network gateway) it is connected, EPC network could be accessed.If correctly ePDG can not be selected, route detour problem may be brought.
At present, in order to avoid route roundabout, terminal by untrusted appoint WLAN access EPC network when, can first with
AAA (English：Authentication Authorization Accounting, Chinese：Authentication and authorization charging) server carries out
Information exchange, obtain terminal positional information, afterwards terminal according to positional information build FQDN (English：Fully
Qualified Domain Name, Chinese：Full name domain name), and according to the FQDN building from DNS (English：Domain Name
System, Chinese：Domain name system) server lookup and obtain ePDG IP (English：Internet Protocol, Chinese：Net
Network agreement) address.Due to comprising the positional information of terminal in FQDN, therefore can be obtained current apart from terminal by said method
The address of the nearer ePDG in present position, thus improve the choice accuracy of ePDG.
Although however, can reduce using technique scheme producing the roundabout probability of route in data transmission procedure,
It is to need to open interface between terminal and aaa server, to obtain the positional information of terminal present Access, attached in standard terminal
The signalling interactive process that increased between terminal and aaa server in flow process, bring extra signaling consumption and time delay.
Content of the invention
The present invention provides a kind of method and device of selection ePDG, can work as terminal and appoint WLAN to access EPC by untrusted
During network, in the case of not increasing external signalling expense and time delay, improve the choice accuracy of ePDG.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that：
In a first aspect, the present invention provides a kind of method of selection ePDG, the method includes：
The domain name mapping request that receiving terminal sends, carries initial domain name and described terminal in domain name analysis request
Access network information；
Search positional information corresponding with described access network information in corresponding table, described corresponding table is used for indicating access network
Corresponding relation between information and positional information；
Determine the IP address of ePDG according to described initial domain name and described positional information, and the IP address of described ePDG is sent out
Deliver to described terminal, in order to described terminal, ePDG is selected according to the IP address of described ePDG.
Second aspect, the embodiment of the present invention provides a kind of device of selection ePDG, and this device includes：
Receiving unit, the domain name mapping request sending for receiving terminal, carry initial in domain name analysis request
The access network information of domain name and described terminal；
Searching unit, carry in the domain name mapping request being received with described receiving unit for lookup in corresponding table is connect
The corresponding positional information of inbound information, described corresponding table is used for indicating the corresponding relation between access network information and positional information；
Determining unit, for the initial domain name that carries in the domain name mapping request that received according to described receiving unit and described
The positional information that searching unit finds determines the network protocol IP address of evolution packet data gateway ePDG, and by described ePDG's
IP address sends to described terminal, selects ePDG in order to described terminal according to the IP address of described ePDG.
The method and device of the selection ePDG that the present invention provides, is compared to terminal of the prior art by taking with AAA
Signalling interactive process between business device obtains positional information, so that it is determined that the IP address of ePDG, the present invention can be according to terminal
Access network information finds out the positional information of terminal from corresponding table, so that it is determined that the IP address of ePDG.On the one hand, present invention knot
The positional information closing terminal selects ePDG, can obtain the address being presently in the nearer ePDG in position apart from terminal, improves
The choice accuracy of ePDG；On the other hand, the present invention does not need to carry out Signalling exchange with aaa server, can be directly from corresponding table
The middle positional information obtaining terminal, will not increase extra signaling consumption and time delay during the IP address determining ePDG.
Therefore, when the present invention can work as terminal and appoints WLAN to access EPC network by untrusted, external signalling expense and time delay are not being increased
In the case of, improve the choice accuracy of ePDG.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below by use required in embodiment
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, can also be obtained other attached according to these accompanying drawings
Figure.
Fig. 1 is the interworking architecture schematic diagram of EPC network and non-3 GPP access network；
Fig. 2 is a kind of method flow diagram of selection ePDG provided in an embodiment of the present invention；
Fig. 3 is another kind of method flow diagram selecting ePDG provided in an embodiment of the present invention；
Fig. 4 is another kind of method flow diagram selecting ePDG provided in an embodiment of the present invention；
Fig. 5 is a kind of apparatus structure schematic diagram of selection ePDG provided in an embodiment of the present invention；
Fig. 6 is a kind of structural representation of dns server provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the present invention is applied to EPC network and non-3 gpp (English：3rdGeneration Partnership
Project, Chinese：Third generation partner program) access network composition network system, Fig. 1 be this network system in EPC network
Interworking architecture schematic diagram with non-3 GPP access network.Non-3 GPP access can be divided into trusted non-3 gpp (such as trusted WLAN)
Access and untrusted appoints non-3 gpp (for example untrusted appoints WLAN) to access, wherein, trusted non-3 GPP access refers to by operation
The WLAN access network of business or partner, untrusted appoints non-3 GPP access to refer to access by the WLAN that such as user is voluntarily arranged
Network.As shown in figure 1, the intercommunication of EPC network and non-3 GPP access network is realized by S2a/S2b interface.EPC network and non-3 gpp
Anchor point between access network is PDN GW15.Trusted non-3 GPP access network 19 can directly pass through S2a interface with PDN GW15 even
Connect, untrusted appoints non-3 GPP access network 20 need to be connected with PDN GW15 through ePDG17, the interface between ePDG17 and PDN GW15
For S2b.Wherein, EPC network is by MME (English：Mobility Management Entity, Chinese：Mobile management entity) 11,
SGW (English：Serving Gateway, Chinese：Gateway) 13, PDN GW15, HSS (English：Home Subscriber
Server, Chinese：Home subscriber server) 12, PCRF (English：Policy and Charging Rules Function, in
Literary composition："Policy and Charging Rules Function) 14 entities and 3GPP AAA (English：Authentication Authorization
Accounting, Chinese：Authentication and authorization charging) server 18 grade network element composition, the such as Fig. 1 of the annexation between said network element institute
Show.
The embodiment of the present invention provides a kind of method of selection ePDG, and the method can be executed by dns server, as Fig. 2 institute
Show, the method includes：
101st, the domain name mapping request that receiving terminal sends.
Wherein, carry the access network information of initial domain name and terminal in domain name mapping request.
Domain name is a certain computer or the title calculating unit on network, is made up of with the name that point separates a string, uses
In the electronic bearing identifying computer in data transmission procedure, each IP address can have a domain name.Dns server
On be configured with mapping relations between domain name and IP address, a domain name can be converted to an IP address by dns server,
One IP address can be converted into corresponding host name, the process obtaining the corresponding IP address of domain name is called domain name mapping
Process.
It is understood that terminal initiates domain name process of analysis according to the domain name of ePDG, the IP address of ePDG can be obtained,
Detailed process is that terminal determines the initial domain name of an ePDG, rear transmission to dns server carry the domain name of initial domain name
Analysis request.
In embodiments of the present invention, terminal can be by static configuration or using HPLMN ID (English：Home
Public Land Mobile Network Identity, Chinese：Ownership public sphere mobile network mark) mode that builds
Obtain the FQDN of an ePDG.FQDN is made up of host name and complete trails, and Domain Name Form registering sites is
“epdg.epc.mnc.mcc.pub.3gppnetwork.org”.Wherein, epdg is used for identifying that the network element that mobile subscriber accesses is
Evolution packet data gateway, epc is used for identifying that mobile subscriber accesses evolution packet data gateway in the packet core network of evolution,
Mnc (English：Moblie network code, Chinese：Mobile network code) for identifying the mobile network belonging to mobile subscriber
Network, such as China Mobile corresponding 00,02,04, CHINAUNICOM corresponding 01,06,09；Mcc (English：Mobile country code,
Chinese：Mobile Country Code MCC) for identifying the country described in mobile subscriber, such as China corresponding 460；Pub, 3gppnetwork and
Org represents mobile subscriber voluntarily in 3gpp (English：3rdGeneration partnership project, Chinese：3rd bullet
Partner program) net definitions common domain name.As can be seen here, do not include the positional information of the terminals such as province/city in FQDN,
The choice accuracy of ePDG can only ensure in the range of a PLMN, and dns server can not accurately select terminal to be currently located province/city
EPDG, route detour problem may be brought.
In order to improve the choice accuracy of ePDG, in domain name mapping request, also carry the access network information of terminal, in order to
Dns server determines the positional information of terminal according to this access network information.In view of terminal and access network and BNG (English：
Broadband Network Gateway, Chinese：Wideband network gateway control device) geographical position nearer, therefore, this
In inventive embodiments, the IP address of terminal, the IP address of access network, broadband access station location marker etc. can serve as connecing of terminal
Inbound information.
102nd, determine whether the form of initial domain name is identical with the form of FQDN.If identical, execution step 103 and step
Rapid 104；Otherwise, execution step 105.
When the form of initial domain name and the form of FQDN are identical, initial domain name does not include the positional information of terminal, works as end
During the roaming of end, due to not including the positional information of terminal in initial domain name, the choice accuracy of ePDG only ensures in a PLMN model
In enclosing.And the form of the form when initial domain name and FQDN is when differing, initial domain name has potentially included the positional information of terminal,
Now can consider directly to determine the IP address of ePDG according to initial domain name.For example, the user of using terminal knows that itself is located
Position, now user can be for terminal one domain name containing the ePDG of positional information of configuration by way of static configuration.
103rd, search positional information corresponding with access network information in corresponding table.
Wherein, corresponding table is used for indicating the corresponding relation between access network information and positional information, positional information can be wrapped
Include geographical location information and/or administrative geography position, for example, the positional information of access network can be longitude and latitude, city name, province
In city's title one or more.
It should be noted that corresponding table can store in the dns server it is also possible to be stored in beyond dns server
In other network equipments, the present invention does not limit to this.
104th, the network protocol IP address of evolution packet data gateway ePDG is determined according to initial domain name and positional information, and
The IP address of ePDG is sent to terminal.
It is understood that step 103 and step 104 can be executed by dns server or dns server will
After domain name mapping request sends the network equipment to beyond dns server, by the network equipment execution beyond dns server, this
Invention does not limit to this.
It should be noted that dns server may find multiple positions and the nearer ePDG of terminal, DNS can be random
Or terminal is sent to according to the IP that the actual conditions of ePDG select one of ePDG, in order to terminal according to the IP ground of ePDG
Location selects ePDG；The IP address of the ePDG finding all can also be sent to terminal, afterwards one of ePDG be selected by terminal
IP address, and then determine which the ePDG of selection is according to the IP address of ePDG selecting.Wherein, the reality according to ePDG
Situation selects one of ePDG to be specifically as follows the ePDG selecting wherein to load minimum.Select an ePDG's in multiple ePDG
Method, the present invention does not limit.
105th, directly determine the IP address of ePDG according to initial domain name, and the IP address of ePDG is sent to terminal.
The method of selection ePDG provided in an embodiment of the present invention, is compared to terminal of the prior art by taking with AAA
Signalling interactive process between business device obtains positional information, so that it is determined that the IP address of ePDG, the present invention can be according to terminal
Access network information finds out the positional information of terminal from corresponding table, so that it is determined that the IP address of ePDG.On the one hand, present invention knot
The positional information closing terminal selects ePDG, can obtain the address being presently in the nearer ePDG in position apart from terminal, improves
The choice accuracy of ePDG；On the other hand, the present invention does not need to carry out Signalling exchange with aaa server, can be directly from corresponding table
The middle positional information obtaining terminal, will not increase extra signaling consumption and time delay during the IP address determining ePDG.
Therefore, when the present invention can work as terminal and appoints WLAN to access EPC network by untrusted, external signalling expense and time delay are not being increased
In the case of, improve the choice accuracy of ePDG.
In order to ensure that all access network information have corresponding positional information, in an implementation of the embodiment of the present invention
In, the positional information of acquiescence can be set.Therefore, on the basis of implementation as shown in Figure 2, it is also implemented as figure
Implementation shown in 3.Wherein, lookup positional information corresponding with access network information can be concrete in corresponding table for step 103
It is embodied as step 1031 to step 1033：
1031st, determine in corresponding table and whether there is access network information.If it is, execution step 1032；Otherwise, execute step
Rapid 1033.
Can not find from corresponding table in view of part access network information, in order to ensure all access network information all
There is corresponding positional information, the positional information of acquiescence can be set, and the positional information that this is given tacit consent to is defined as in corresponding table not
The corresponding positional information of access network information existing.
When access network information includes the IP address of terminal, step 1031 can be implemented as the IP determining terminal first
The IP address section that address is located, determines afterwards in corresponding table and whether there is IP address section.In this case, corresponding table is used for indicating
Corresponding relation between IP address section and positional information.
When access network information includes broadband access station location marker, step 1031 can be implemented as in the corresponding table of determination
With the presence or absence of broadband access station location marker.In this case, corresponding table is used for indicating broadband access station location marker and positional information
Between corresponding relation.
1032nd, obtain positional information corresponding with access network information in corresponding table.
1033rd, the positional information of acquiescence is defined as the corresponding positional information of access network information.
It should be noted that what the current domain name analysis request that ought there is not terminal transmission in corresponding table carried access network
During information, if dns server is the domain name mapping request receiving for the first time the transmission of this terminal, can will be previous for this terminal
What in secondary domain name mapping request process, defined location information carried during being defined as this terminal current domain name analysis request connects
The corresponding positional information of inbound information；If dns server is not the domain name mapping request receiving the transmission of this terminal for the first time,
Then the positional information of acquiescence can be determined.
The method of selection ePDG provided in an embodiment of the present invention, by arranging the positional information given tacit consent to it is ensured that all accesses
Net information all can find corresponding positional information, enables dns server to select the nearer ePDG in position according to for terminal, thus
When making terminal appoint WLAN to access EPC network by untrusted, in the case of not increasing external signalling expense and time delay, it is possible to increase
The choice accuracy of ePDG.
The IP address of the ePDG nearer with terminal location can be found for the ease of dns server, in the embodiment of the present invention
An implementation in, dns server using include terminal positional information domain name lookup ePDG IP address.Therefore, exist
On the basis of implementation as shown in Figure 2, it is also implemented as implementation as shown in Figure 4, wherein, step 104 basis
Initial domain name and positional information determine the network protocol IP address of evolution packet data gateway ePDG, and the IP address of ePDG is sent out
Deliver to terminal, step 1041 and step 1042 can be implemented as：
1041st, initial domain name is reconstructed according to positional information, obtain current domain name.
Wherein, current domain name includes positional information.
For example, that current domain name can be " province.epdg.epc.mnc.mcc.pub.3gppnetwork.org ",
Wherein province represents province, and current domain name can also be
" city.epdg.epc.mnc.mcc.pub.3gppnetwork.org ", wherein city represents city.
1042nd, determine the IP address of ePDG according to current domain name, and the IP address of ePDG is sent to terminal.
When a Pekinese IMS (English：IP Multimedia Subsystem, Chinese：IP Multimedia System) eventually
End, the VoWiFi that only contracted (English：Voice/Video over WiFi, Chinese：Based on wireless voice/video business).
When terminal roaming to Shanghai, the process registered in wlan network as：Terminal is connected to local untrusted and appoints
Wlan network, and obtain a local ip address, terminal obtains one by static configuration or by way of building using HPLMN ID
The FQDN of individual ePDG, i.e. initial domain entitled " epdg.epc.mnc.mcc.pub.3gppnetwork.org ", backward DNS service
Device sends and carries local ip address and initial domain name.
Dns server receives the domain name mapping request of terminal transmission, determines the form of initial domain name and the lattice of FQDN
Formula is identical；Dns server determines that local ip address is located in IP address section 1, and it is corresponding that the corresponding table of inquiry obtains this IP address section 1
Position is Shanghai；DNS reconstructs initial domain name according to positional information, obtains current domain name, and current domain name is
“shangh.epdg.epc.mnc.mcc.pub.3gppnetwork.org”；Dns server determines ePDG's according to current domain name
IP address；Dns server sends the IP address of corresponding for current domain name ePDG to terminal.
After terminal receives the IP address of ePDG of dns server return, determine the ePDG connecting according to IP address；Eventually
End is connected with PDNGW by ePDG, and then accesses EPC network.
The method of selection ePDG provided in an embodiment of the present invention, is compared to terminal of the prior art by taking with AAA
Signalling interactive process between business device obtains positional information, so that it is determined that the IP address of ePDG, the present invention can be according to terminal
Access network information finds out the positional information of terminal from corresponding table, so that it is determined that the IP address of ePDG.On the one hand, present invention knot
The positional information closing terminal selects ePDG, can obtain the address being presently in the nearer ePDG in position apart from terminal, improves
The choice accuracy of ePDG；On the other hand, the present invention does not need to carry out Signalling exchange with aaa server, can be directly from corresponding table
The middle positional information obtaining terminal, will not increase extra signaling consumption and time delay during the IP address determining ePDG.
Therefore, when the present invention can work as terminal and appoints WLAN to access EPC network by untrusted, external signalling expense and time delay are not being increased
In the case of, improve the choice accuracy of ePDG.
The embodiment of the present invention provides a kind of device 30 of selection ePDG, and this device 30 can be used for executing shown in Fig. 2 to Fig. 4
Arbitrarily a set of method flow, as shown in figure 5, this device 30 includes：
Receiving unit 301, the domain name mapping request sending for receiving terminal, carry initial domain in domain name mapping request
Name and the access network information of terminal.
Searching unit 302, the domain name mapping for searching in corresponding table and receiving unit 301 receives carries in asking
The corresponding positional information of access network information, corresponding table is used for indicating the corresponding relation between access network information and positional information.
Determining unit 303, for the initial domain name that carries in the domain name mapping request that received according to receiving unit 301 with look into
The positional information that unit 302 finds is looked for determine the network protocol IP address of evolution packet data gateway ePDG, and the IP by ePDG
Address sends to terminal, selects ePDG in order to terminal according to the IP address of ePDG.
In an implementation of the embodiment of the present invention, searching unit 302 specifically for：
Determine in corresponding table and whether there is access network information；
If there is access network information in corresponding table, obtain positional information corresponding with access network information in corresponding table；
If there is not access network information in corresponding table, the positional information of acquiescence is defined as access network information corresponding
Positional information；
When access network information includes the IP address of terminal, determine the IP address section that the IP address of terminal is located, and determine
Whether there is IP address section, corresponding table is used for indicating the corresponding relation between IP address section and positional information in corresponding table；
When access network information includes broadband access station location marker, determine in corresponding table with the presence or absence of broadband access position mark
Know, corresponding table is used for indicating the corresponding relation between broadband access station location marker and positional information.
In an implementation of the embodiment of the present invention, device 30 also includes：
Judging unit 304, for determining the lattice of the initial domain name carrying in the domain name mapping request that receiving unit 301 receives
Whether formula is identical with the form of full name domain name FQDN.
Searching unit 302, is additionally operable to when the form that judging unit 304 determines initial domain name is identical with the form of FQDN,
Search the corresponding positional information of access network information from corresponding table.
Determining unit 303, is additionally operable to determine that the form of initial domain name is differed with the form of FQDN when judging unit 304
When, directly determine the IP address of ePDG according to initial domain name, and the IP address of ePDG sent to terminal, in order to terminal according to
The IP address of ePDG selects ePDG.
In an implementation of the embodiment of the present invention, determining unit 303 is specifically for according to positional information reconstruct just
Beginning domain name, obtains current domain name, and determines the IP address of ePDG according to current domain name, and current domain name includes positional information.
The device of selection ePDG provided in an embodiment of the present invention, is compared to terminal of the prior art by taking with AAA
Signalling interactive process between business device obtains positional information, so that it is determined that the IP address of ePDG, the present invention can be according to terminal
Access network information finds out the positional information of terminal from corresponding table, so that it is determined that the IP address of ePDG.On the one hand, present invention knot
The positional information closing terminal selects ePDG, can obtain the address being presently in the nearer ePDG in position apart from terminal, improves
The choice accuracy of ePDG；On the other hand, the present invention does not need to carry out Signalling exchange with aaa server, can be directly from corresponding table
The middle positional information obtaining terminal, will not increase extra signaling consumption and time delay during the IP address determining ePDG.
Therefore, when the present invention can work as terminal and appoints WLAN to access EPC network by untrusted, external signalling expense and time delay are not being increased
In the case of, improve the choice accuracy of ePDG.
The embodiment of the present invention also provides a kind of dns server 40, as shown in fig. 6, this dns server 40 includes：At least one
Individual processor 401, communication interface 402.Wherein, communication interface 402 is for the analysis request of receiving terminal transmission, to terminal
Send the IP address of ePDG, and the communication and other network elements between；Processor 401 includes please for parsing the parsing receiving
The resolver asked, for determining the position judgment device of positional information, and for inquiring about name server of IP address etc..Process
Device 401 specifically for the step 1031 to step 105, Fig. 3 for the step 102 in execution Fig. 2 to step 1033, and in Fig. 4
Step 1041 and step 1042.Additionally, this dns server 40 also includes communication bus 403 and memory 404.Wherein, communicate
Bus 403 is used for realizing the connection communication between said modules, and memory 404 is used for storing computer instruction and needs to preserve
Data.
Dns server provided in an embodiment of the present invention, be compared to terminal of the prior art by with aaa server it
Between signalling interactive process obtain positional information, so that it is determined that the IP address of ePDG, the present invention can be according to the access network of terminal
Information finds out the positional information of terminal from corresponding table, so that it is determined that the IP address of ePDG.On the one hand, the present invention combines terminal
Positional information select ePDG, can obtain the address being presently in the nearer ePDG in position apart from terminal, improve the choosing of ePDG
Select precision；On the other hand, the present invention does not need to carry out Signalling exchange with aaa server, can directly obtain eventually from corresponding table
The positional information at end, will not increase extra signaling consumption and time delay during the IP address determining ePDG.Therefore, this
Bright can work as terminal by untrusted appoint WLAN access EPC network when, in the case of not increasing external signalling expense and time delay, carry
The choice accuracy of high ePDG.
Each embodiment in this specification is all described by the way of going forward one by one, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Real especially for device
For applying example, because it is substantially similar to embodiment of the method, so describing fairly simple, referring to embodiment of the method in place of correlation
Part illustrate.
One of ordinary skill in the art will appreciate that realizing all or part of flow process in above-described embodiment method, it is permissible
Instruct related hardware to complete by computer program, described program can be stored in computer read/write memory medium
In, this program is upon execution, it may include as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (English：Read-Only Memory, referred to as：ROM) or random access memory (English：
Random Access Memory, referred to as：RAM) etc..
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of method of selection ePDG is it is characterised in that methods described includes：
The domain name mapping request that receiving terminal sends, carries connecing of initial domain name and described terminal in domain name analysis request
Inbound information；
Search positional information corresponding with described access network information in corresponding table, described corresponding table is used for indicating access network information
Corresponding relation and positional information between；
Determine the network protocol IP address of evolution packet data gateway ePDG according to described initial domain name and described positional information, and
The IP address of described ePDG is sent to described terminal, in order to described terminal, ePDG is selected according to the IP address of described ePDG.
2. method according to claim 1 is it is characterised in that described search and described access network information pair in corresponding table
The positional information answered, including:
Determine the described access network information that whether there is in described corresponding table；
If there is described access network information in described corresponding table, obtain corresponding with described access network information in described corresponding table
Positional information；
If there is not described access network information in described corresponding table, the positional information of acquiescence is defined as described access network letter
Cease corresponding positional information.
3. method according to claim 2 is it is characterised in that described access network information includes the IP address of terminal, described
Determine the described access network information that whether there is in described corresponding table, including：
Determine the IP address section that the IP address of described terminal is located；
Determine and in described corresponding table, whether there is described IP address section, described corresponding table is used for indicating IP address section and positional information
Between corresponding relation.
4. method according to claim 2 is it is characterised in that described access network information includes broadband access station location marker,
Whether there is described access network information in the described corresponding table of described determination, including：
Determine and in described corresponding table, whether there is described broadband access station location marker, described corresponding table is used for indicating that described broadband connects
Enter the corresponding relation between station location marker and positional information.
5. method as claimed in any of claims 1 to 4 it is characterised in that described search in corresponding table with
Before the corresponding positional information of described access network information, methods described includes：
Determine whether the form of described initial domain name is identical with the form of full name domain name FQDN；
If the form of described initial domain name is identical with the form of described FQDN, from corresponding table, search described access network information
Corresponding positional information；
If the form of described initial domain name and the form of described FQDN differ, directly institute is determined according to described initial domain name
State the IP address of ePDG, and the IP address of described ePDG is sent to described terminal, in order to described terminal according to described ePDG
IP address select ePDG.
6. method according to claim 5 is it is characterised in that described true according to described initial domain name and described positional information
Determine the IP address of ePDG, including：
Described initial domain name is reconstructed according to described positional information, obtains current domain name, described current domain name includes described position letter
Breath；
Determine the IP address of described ePDG according to described current domain name.
7. a kind of device of selection ePDG is it is characterised in that described device includes：
Receiving unit, the domain name mapping request sending for receiving terminal, carry initial domain name in domain name analysis request
Access network information with described terminal；
Searching unit, for searching the access network carrying in the domain name mapping request receiving with described receiving unit in corresponding table
The corresponding positional information of information, described corresponding table is used for indicating the corresponding relation between access network information and positional information；
Determining unit, initial domain name and described lookup that the domain name mapping for being received according to described receiving unit carries in asking
The positional information that unit finds determines the network protocol IP address of evolution packet data gateway ePDG, and the IP ground by described ePDG
Location sends to described terminal, selects ePDG in order to described terminal according to the IP address of described ePDG.
8. device according to claim 7 is it is characterised in that described searching unit is specifically for determining in described corresponding table
With the presence or absence of described access network information；
If there is described access network information in described corresponding table, obtain corresponding with described access network information in described corresponding table
Positional information；
If there is not described access network information in described corresponding table, the positional information of acquiescence is defined as described access network letter
Cease corresponding positional information；
When described access network information includes the IP address of terminal, determine the IP address section that the IP address of described terminal is located, and
Determine and in described corresponding table, whether there is described IP address section, described corresponding table is used for indicating between IP address section and positional information
Corresponding relation；
When described access network information includes broadband access station location marker, determine in described corresponding table and connect with the presence or absence of described broadband
Enter station location marker, described corresponding table is used for indicating the corresponding relation between described broadband access station location marker and positional information.
9. the device according to claim 7 or 8 is it is characterised in that described device includes：
Judging unit, for determine the form of the initial domain name carrying in the domain name mapping request that described receiving unit receives with complete
Claim the form of domain name FQDN whether identical；
Described searching unit, is additionally operable to determine the form phase with described FQDN for the form of described initial domain name when described judging unit
Meanwhile, search the corresponding positional information of described access network information from corresponding table；
Described determining unit, is additionally operable to the form determining the form of described initial domain name and described FQDN when described judging unit not
When identical, directly determine the IP address of described ePDG according to described initial domain name, and the IP address of described ePDG is sent to institute
State terminal, in order to described terminal, ePDG is selected according to the IP address of described ePDG.
10. device according to claim 9 is it is characterised in that described determining unit is specifically for believing according to described position
Breath reconstructs described initial domain name, obtains current domain name, and determines the IP address of described ePDG according to described current domain name, described works as
Front domain name includes described positional information.
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| CN201611136525.3A CN106412148A (en) | 2016-12-09 | 2016-12-09 | EPDG selecting method and device |
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