CN104754559A - DNS query method and DNS query network element - Google Patents
DNS query method and DNS query network element Download PDFInfo
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- CN104754559A CN104754559A CN201310741684.6A CN201310741684A CN104754559A CN 104754559 A CN104754559 A CN 104754559A CN 201310741684 A CN201310741684 A CN 201310741684A CN 104754559 A CN104754559 A CN 104754559A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Abstract
The embodiment of the invention provides a DNS query method and a DNS query network element. The DNS query method comprises the steps of sending a first DNS query instruction applied to an EPC (Evolved Packet Core) network to carry out DNS query to a DNS server of the attribution of a multi-mode terminal connected to the domestic EPC network; and sending a second DNS query instruction, which is applied to a 2G/3G core network to carry out DNS query, to the DNS server when a query result cannot be acquired, and acquiring the query result through the second DNS query instruction. According to the invention, a problem that multi-mode terminals with the attribution being not China cannot access to data services carried out through terminals under the condition that the EPC network is not deployed at the attribution is solved. The invention relates to the technical field of mobile communication.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of DNS query method and network element.
Background technology
Mobility Management Entity (MME, Mobility Management Entity) be the packet-based core networks (EPC of evolution, Evolved Packet Core) signaling entity in network, major function comprises: support Non-Access Stratum signaling (NAS, Non Access Stratum) signaling and safety thereof, the management of tracing area (TrackingArea) list, service gateway nodes (S-GW, Serving Gateway) and grouped data network gateway node (P-GW, PDN Gateway) selection, the selection of MME when switching across MME, to Serving GPRS Support Node (SGSN in second generation mobile communication system 2G/ 3-G (Generation Three mobile communication system) 3G connecting system handoff procedure, Serving General Packet Radio Service Support Node) selection, the authentication of user, Roaming control and bearer management, third generation partner program (3GPP, ThirdGeneration Partnership Project) different access networks core network node between mobile management, and UE is at the grouping system connectivity management-Idle state (ECM-IDLE of evolution, Evolved PacketSystem Connection Management-IDLE) accessibility management etc. under state.
When foreign users uses the multimode terminal of support forth generation mobile communication system 4G network to roam into China's roaming place network, preferentially by this multimode terminal access roaming ground 4G network, so, before user uses roaming place network, roaming place network needs the relevant information obtaining this multimode terminal, the CAMEL-Subscription-Information, charge information etc. of such as this multimode terminal.But the above-mentioned relevant information of user is kept in the appointment network element of multimode terminal belonging area network, therefore, when multimode terminal is by base station, roaming place access roaming ground MME, roaming place MME needs the appointment network element of accessing this multimode terminal belonging area network, obtains the relevant information of this user.
Further, during this multimode terminal access roaming place network, carry APN (APN, Access Point Name) this APN can by the name server (DNS of this multimode terminal ownership place, Domain in Name Server) resolve, obtain the address information of specifying network element, but, MME is the network element in EPC network, to dns server send query statement for 4G network, if the ownership place of this multimode terminal does not dispose EPC network, so also would not dispose the dns server of EPC network, that is, if the dns server that the ownership place of multimode terminal is corresponding is not the dns server in EPC network, this dns server also just cannot resolve the instruction that MME sends, so just cannot parse the address information of above-mentioned appointment network element, cause the multimode terminal of foreign users cannot by multimode terminal in Chinese usage data business.
Summary of the invention
Embodiments provide a kind of DNS query method and network element, in order to solve in prior art, the multimode terminal of the non-China of ownership place, under not disposing the condition of EPC network, cannot carry out the problem of data service at ownership place by terminal.
Based on the problems referred to above, one of a kind of DNS query method that the embodiment of the present invention provides, comprising:
Dns server to the multimode terminal ownership place of the national EPC network of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query;
When Query Result cannot be obtained, send to described dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by described second DNS query instruction;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
Based on the problems referred to above, a kind of DNS query method two that the embodiment of the present invention provides, comprising:
When the multimode terminal determining to access national EPC network is the foreign multimode terminal roaming into this country, dns server to described multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query;
When Query Result cannot be obtained by described first DNS query instruction, using the Query Result by described second DNS query instruction acquisition as the Query Result of this DNS query;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
One of a kind of DNS query network element that the embodiment of the present invention provides, comprising:
First sending module, the dns server for the multimode terminal ownership place to the national EPC network of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query;
Second sending module, for when described first sending module cannot obtain Query Result, sends to described dns server and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by described second DNS query instruction; Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
A kind of DNS query network element two that the embodiment of the present invention provides, comprising:
Determination module, for determining whether the multimode terminal accessing national EPC network is the foreign multimode terminal roaming into this country;
Sending module, when being the foreign multimode terminal roaming into this country for determining to access the multimode terminal of national EPC network when described determination module, dns server to described multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, when Query Result cannot be obtained by described first DNS query instruction, using the Query Result by described second DNS query instruction acquisition as the Query Result of this DNS query;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
The beneficial effect of the embodiment of the present invention comprises:
A kind of DNS query method that the embodiment of the present invention provides and network element, the dns server to the multimode terminal ownership place of the national EPC network of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query; When Query Result cannot be obtained, send to dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by the second DNS query instruction; Or, when the multimode terminal determining to access national EPC network is the foreign multimode terminal roaming into this country, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, when Query Result cannot be obtained by the first DNS query instruction, the Query Result of Query Result as this DNS query of the second DNS query instruction acquisition will be passed through.When by being applied in EPC network the first query statement carrying out DNS query and cannot obtaining Query Result, use the Query Result obtained by being applied in 2G/3G core net the second query statement of carrying out DNS query, if the dns server that the ownership place of multimode terminal is corresponding is not the dns server in EPC network, this dns server cannot resolve the first query statement, so this dns server can be made to parse the address information of said network element by the second query statement, thus obtain CAMEL-Subscription-Information and the charge information of multimode terminal, make the multimode terminal that ownership place is non-originating, do not dispose the condition of EPC network at ownership place under, also the data service of national mobile network can be used.
Accompanying drawing explanation
The flow chart of one of a kind of DNS query method that Fig. 1 provides for the embodiment of the present invention;
The flow chart of a kind of DNS query method two that Fig. 2 provides for the embodiment of the present invention;
The flow chart of a kind of DNS query method that Fig. 3 provides for the embodiment of the present invention 1;
The flow chart of a kind of DNS query method that Fig. 4 provides for the embodiment of the present invention 2;
The structural representation of one of a kind of DNS query network element that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of DNS query network element two that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Embodiments provide a kind of DNS query method and network element, below in conjunction with Figure of description, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
The embodiment of the present invention provides a kind of one of DNS query method, as shown in Figure 1, comprising:
S101, to access national EPC network multimode terminal ownership place dns server send be applied in EPC network the first DNS query instruction carrying out DNS query.
S102, when Query Result cannot be obtained, to dns server send be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, by second DNS query instruction obtain Query Result,
Wherein, the first DNS query instruction and the second DNS query instruction are used to indicate the access point name APN that this dns server stores according to multimode terminal, parse the address information of the network element for collecting multimode terminal CAMEL-Subscription-Information and charge information.
The embodiment of the present invention provides a kind of DNS query method two, as shown in Figure 2, comprising:
S201, when the multimode terminal determining to access national EPC network be roam into this country foreign multimode terminal time, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query.
S202, when Query Result cannot be obtained by the first DNS query instruction, the Query Result that will be obtained by the second DNS query instruction as the Query Result of this DNS query,
Wherein, the first DNS query instruction and the second DNS query instruction are used to indicate the access point name APN that dns server stores according to multimode terminal, parse the address information of the network element for collecting this multimode terminal CAMEL-Subscription-Information and charge information.
Below in conjunction with accompanying drawing, with specific embodiment, method provided by the invention and relevant device are described in detail.
Embodiment 1:
In the embodiment of the present invention 1, a kind of DNS query method is provided, as shown in Figure 3, specifically comprises the steps:
S301, to access national EPC network multimode terminal ownership place dns server send be applied in EPC network the first DNS query instruction carrying out DNS query.
Further, in this step, the first DNS query instruction can be NAPTR (Naptr, Naming Authority Pointer) record queries instruction.In EPC network, MME is generally the instruction of Naptr record queries to the query statement that dns server sends, because carry out DNS query by the instruction of Naptr record queries can feed back more information, such as, when MME is according to the APN stored in terminal, when inquiring about network element address corresponding to this APN to this terminal attaching ground dns server, APN can corresponding multiple address information, can determine according to the screening conditions preset the address information meeting screening conditions most by Naptr record queries, suppose the pre-conditioned network element maximum for selection capacity, so, can from multiple address informations corresponding to this APN by Naptr record queries, the address information of the network element that capacity of determining is maximum, and feed back to MME.
Further, MME can obtain the address of the dns server of this multimode terminal ownership place in the following way: first MME is stored this multimode terminal by the corresponding provincial dns server in roaming place, the APN carried when accessing national EPC resolves, because the ownership place of this multimode terminal is not in roaming place, provincial dns server cannot parse the address information of network element corresponding to this APN, further by the upper level dns server of provincial dns server, be generally national root dns server, this APN is resolved, because the ownership place of this multimode terminal is in foreign country, therefore, root dns server also cannot parse the address information of network element corresponding to this APN, (IPX is exchanged further by IP, IP Exchange) technology or GPRS roaming switch (GRX, GPRS Roaming Exchange) address of dns server that the ownership place of this multimode terminal of network inquiry is corresponding.
S302, when Query Result cannot be obtained, send to above-mentioned dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by the second DNS query instruction.
Further, in this step, the second DNS query instruction can be the instruction of host A record queries.The instruction of A record queries can be applied in 2G/3G core net carries out DNS query, and in usual each A record, be queried the corresponding address information of main frame, this address information is fed back to MME can complete inquiry.
Further, in the present embodiment, no matter this multimode terminal belongs to this country still belongs to foreign country, all first carries out DNS query by the first DNS query instruction, when Query Result can be obtained by the first DNS query instruction, use the Query Result obtained by the first DNS query instruction, this situation can deploy EPC network for multimode terminal ownership place, regardless of multimode terminal unit contractual 2G/3G network still signing 4G network, dns server is be deployed in the dns server in EPC network, this dns server can resolve the first DNS query instruction, Query Result can be obtained by the first DNS query instruction, for the multimode terminal of signing 2G/3G network, this Query Result is the Gateway GPRS Support Node (GGSN saving this multimode terminal CAMEL-Subscription-Information and charge information, Gateway GPRS Support Node) address, for the multimode terminal of signing 4G network, this Query Result is the packet data gateway (PDN-Gateway saving this multimode terminal CAMEL-Subscription-Information and charge information, Packet Data Network Gateway) address.When Query Result cannot be obtained by the first DNS query instruction, may be because multimode terminal ownership place does not dispose EPC network, the dns server in EPC network is not just disposed yet, so the dns server of this ownership place possibly cannot resolve the first DNS query instruction being applied in EPC network and carrying out DNS query, so can use the second DNS query instruction being applied in 2G/3G core net and carrying out DNS query, although this ownership place does not dispose EPC network, but at least deploy 2G/3G network, usually the dns server of this ownership place can resolve the second DNS query instruction, Query Result is obtained by the second DNS query instruction, in this case, multimode terminal may be contracted 2G/3G network, and the Query Result obtained by the second DNS query instruction is the GGSN address saving this multimode terminal CAMEL-Subscription-Information and charge information.
The address of the network element that S303, basis inquire, conducts interviews to this network element, obtains CAMEL-Subscription-Information and the charge information of corresponding multimode terminal.
Further, Radix Angelicae Sinensis possession deploys 4G and this multimode terminal has been contracted during 4G network, store the network element of multimode terminal CAMEL-Subscription-Information and charge information, the network element namely inquired by dns server can be PDN-Gateway, 4G is not disposed and this multimode terminal has been contracted when 2G or 3G network in Radix Angelicae Sinensis possession, or Radix Angelicae Sinensis possession deploys 4G and this multimode terminal has been contracted when 2G or 3G network, store the network element of multimode terminal CAMEL-Subscription-Information and charge information, the network element namely inquired by dns server can be GGSN.
Embodiment 2:
In the embodiment of the present invention 2, a kind of DNS query method is provided, as shown in Figure 4, specifically comprises the steps:
S401, judge whether the multimode terminal accessing national EPC network is international roaming terminal, if so, enters step S402, if not, enters step S404.
In this step, can according to this multimode terminal when accessing national EPC network, in the Attach Request message sent, this multimode terminal information of home location carried, i.e. public land mobile network (PLMN, PublicLand Mobile Network) value, judge whether this multimode terminal is international roaming terminal.
S402, when the multimode terminal determining to access national EPC network be roam into this country foreign multimode terminal time, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query.
Further, in this step, can send to the dns server of multimode terminal ownership place and be applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, sending order the present embodiment does not limit, when all obtaining Query Result by the first DNS query instruction and the second DNS query instruction, preferably, the Query Result obtained by the first DNS query instruction can be adopted.
S403, when obtaining Query Result by the first DNS query instruction, the Query Result that will be obtained by the second DNS query instruction is as the Query Result of this DNS query.Enter step S405.
S404, when the multimode terminal determining to access EPC network is national multimode terminal, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and obtains Query Result by the first DNS query instruction.
The address of the network element that S405, basis inquire, conducts interviews to this network element, obtains CAMEL-Subscription-Information and the charge information of corresponding multimode terminal.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of DNS query network element, the principle of dealing with problems due to these network elements is similar to a kind of aforementioned DNS query method, and therefore the enforcement of this network element see the enforcement of preceding method, can repeat part and repeat no more.
Embodiments provide a kind of DNS query network element, as shown in Figure 5, comprising:
First sending module 501, the dns server for the multimode terminal ownership place to the national EPC network of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query;
Second sending module 502, for when described first sending module 501 cannot obtain Query Result, send to described dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by described second DNS query instruction; Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
Further, described network element, also comprises: acquisition module 503;
Described acquisition module 503, for after acquisition Query Result, according to the address of the described network element inquired, conducts interviews to described network element, obtains CAMEL-Subscription-Information and the charge information of corresponding multimode terminal.
Further, the first DNS query instruction that described first sending module 501 sends is the instruction of NAPTR Naptr record queries, and the described second DNS query instruction that described second enquiry module 502 sends is the instruction of host A record queries.
Embodiments provide a kind of DNS query network element, as shown in Figure 6, comprising:
Determination module 601, for determining whether the multimode terminal accessing national EPC network is the foreign multimode terminal roaming into this country;
Sending module 602, when being the foreign multimode terminal roaming into this country for determining to access the multimode terminal of national EPC network when described determination module 601, dns server to described multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, when Query Result cannot be obtained by described first DNS query instruction, using the Query Result by described second DNS query instruction acquisition as the Query Result of this DNS query;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
Further, described sending module 602, time also for determining that when described determination module 601 multimode terminal of access EPC network is national multimode terminal, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and obtains Query Result by described first DNS query instruction.
The function of above-mentioned each unit may correspond to the respective handling step in flow process shown in Fig. 1 to Fig. 4, does not repeat them here.
A kind of DNS query method that the embodiment of the present invention provides and network element, the dns server to the multimode terminal ownership place of the national EPC network of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query; When Query Result cannot be obtained, send to dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by the second DNS query instruction; Or, when the multimode terminal determining to access national EPC network is the foreign multimode terminal roaming into this country, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, when Query Result cannot be obtained by the first DNS query instruction, the Query Result of Query Result as this DNS query of the second DNS query instruction acquisition will be passed through.When by being applied in EPC network the first query statement carrying out DNS query and cannot obtaining Query Result, use the Query Result obtained by being applied in 2G/3G core net the second query statement of carrying out DNS query, if the dns server that the ownership place of multimode terminal is corresponding is not the dns server in EPC network, this dns server cannot resolve the first query statement, so this dns server can be made to parse the address information of said network element by the second query statement, thus obtain CAMEL-Subscription-Information and the charge information of multimode terminal, make the multimode terminal that ownership place is non-originating, do not dispose the condition of EPC network at ownership place under, also the data service of national mobile network can be used.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a DNS query method, is characterized in that, comprising:
Domain name server (DNS) to the multimode terminal ownership place of the packet-based core networks EPC of the national evolution of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query;
When Query Result cannot be obtained, send to described dns server and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by described second DNS query instruction;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
2. the method for claim 1, is characterized in that, after acquisition Query Result, also comprises:
According to the address of the described network element inquired, described network element is conducted interviews, obtain CAMEL-Subscription-Information and the charge information of corresponding multimode terminal.
3. method as claimed in claim 1 or 2, it is characterized in that, described first query statement is the instruction of NAPTR Naptr record queries, and described second query statement is the instruction of host A record queries.
4. a DNS query method, is characterized in that, comprising:
When determining that the multimode terminal of the packet-based core networks EPC network accessing national evolution is the foreign multimode terminal roaming into this country, domain name server (DNS) to described multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query;
When Query Result cannot be obtained by described first DNS query instruction, using the Query Result by described second DNS query instruction acquisition as the Query Result of this DNS query;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
5. method as claimed in claim 4, is characterized in that, when the multimode terminal determining to access EPC network is national multimode terminal, also comprises:
Dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and obtains Query Result by described first DNS query instruction.
6. a DNS query network element, is characterized in that, comprising:
First sending module, the domain name server (DNS) for the multimode terminal ownership place of the packet-based core networks EPC network to the national evolution of access sends and is applied in EPC network the first DNS query instruction carrying out DNS query;
Second sending module, for when described first sending module cannot obtain Query Result, sends to described dns server and is applied in 2G/3G core net the second DNS query instruction carrying out DNS query, obtain Query Result by described second DNS query instruction; Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
7. network element as claimed in claim 6, is characterized in that, also comprise: acquisition module;
Described acquisition module, for after acquisition Query Result, according to the address of the described network element inquired, conducts interviews to described network element, obtains CAMEL-Subscription-Information and the charge information of corresponding multimode terminal.
8. network element as claimed in claims 6 or 7, it is characterized in that, the first DNS query instruction that described first sending module sends is the instruction of NAPTR Naptr record queries, and the described second DNS query instruction that described second enquiry module sends is the instruction of host A record queries.
9. a DNS query network element, is characterized in that, comprising:
Determination module, for determining whether the multimode terminal of the packet-based core networks EPC network accessing national evolution is the foreign multimode terminal roaming into this country;
Sending module, when being the foreign multimode terminal roaming into this country for determining to access the multimode terminal of national EPC network when described determination module, domain name server (DNS) to described multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and be applied in 2G/3G core net the second DNS query instruction carrying out DNS query, when Query Result cannot be obtained by described first DNS query instruction, using the Query Result by described second DNS query instruction acquisition as the Query Result of this DNS query;
Wherein, described first DNS query instruction and described second DNS query instruction are used to indicate the access point name APN that described dns server stores according to described multimode terminal, parse the address information of the network element for collecting described multimode terminal CAMEL-Subscription-Information and charge information.
10. network element as claimed in claim 9, it is characterized in that, described sending module, time also for determining that when described determination module the multimode terminal of access EPC network is national multimode terminal, dns server to this multimode terminal ownership place sends and is applied in EPC network the first DNS query instruction carrying out DNS query, and obtains Query Result by described first DNS query instruction.
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