CN106878475B - Domain name addressing method and system - Google Patents

Domain name addressing method and system Download PDF

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Publication number
CN106878475B
CN106878475B CN201510923023.4A CN201510923023A CN106878475B CN 106878475 B CN106878475 B CN 106878475B CN 201510923023 A CN201510923023 A CN 201510923023A CN 106878475 B CN106878475 B CN 106878475B
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network element
cache
mme
dns
real time
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CN106878475A (en
Inventor
曹维华
贺晓东
李文云
唐宏
邹洁
冀晖
彭巍
杨胜
陆小铭
吕和凯
朱华虹
马啸威
姜松
邢亮
徐博文
黄旭升
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
    • H04L67/5682—Policies or rules for updating, deleting or replacing the stored data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a domain name addressing method and a domain name addressing system, and relates to the technical field of networks. The domain name addressing method comprises the following steps: after receiving a network access request from a user, a mobile management entity MME inquires a DNS server about a network element address of a service user; the DNS server carries out query according to the cache entries, and the MME selects a service network element for the user according to the returned query result, wherein the DNS cache manager monitors the state of the network element in real time and updates the cache entries in the DNS server in real time according to the state of the network element; and the MME selects a service network element for the user according to the returned query result. By the method, the cache entries in the DNS server are updated in real time according to the state of the network elements in the network, and when a user initiates a network access request, the MME can allocate the network elements to the user according to the cache entries updated in real time, so that the proper network elements are allocated to the user according to the real-time state of the network, and the situation that the user experience is reduced due to the fact that the failed network elements are allocated to the user is prevented.

Description

Domain name addressing method and system
Technical Field
The invention relates to the technical field of networks, in particular to a domain name addressing method and a domain name addressing system.
Background
In a 4G EPC (Evolved Packet Core, 4G Core network), a Domain Name System (DNS) Domain name resolution technology is introduced to address and select network elements such as an SGW (Serving GateWay) and a PGW (public data network GateWay). When the EPC network element fails and cannot provide services continuously, if at this Time, a DNS server or an MME (Mobility Management Entity) cache does not expire the TTL (Time To Live) of a domain name resolution result cache entry corresponding To the network element, the DNS still returns a resolution result corresponding To the network element, which results in that a user access request is continuously allocated To the failed network element for processing, thereby reducing user experience.
As shown in fig. 1, the MME queries, according to information such as TAI (Tracking Area Identity) and APN (Access Point Name) of the user, network element addresses such as SGW and PGW from the DNS system, and the MME selects an SGW network element and a PGW network element for the user according to a DNS return result. When a certain network element (SGW or PGW) fails to exit service, if the TTL of the resolution result cache entry corresponding to the network element in the DNS system or MME is not expired, the DNS system will still return the resolution result corresponding to the failed network element to the MME, or the MME directly uses the cache entry that is not expired, so that the failed network element is mistakenly selected and a service failure occurs.
Disclosure of Invention
One object of the present invention is to ensure that network elements are selected for a user according to the real-time status of the network, improving the quality of network service and user perception.
According to an aspect of the present invention, a domain name addressing method is provided, including: after receiving a network access request from a user, a mobile management entity MME inquires a DNS server about a network element address of a service user; the DNS server inquires according to the cache entries and sends the inquiry result to the MME, wherein the DNS cache manager monitors the state of the network element in real time and updates the cache entries in the DNS server in real time according to the state of the network element; and the MME appoints a service network element for the user according to the query result.
Further, the MME has a cache list; the domain name addressing method further comprises: after receiving a network access request from a user, the MME inquires according to a self cache list; if the MME inquires the corresponding item, a service network element is appointed for the user according to the self inquiry result, wherein the DNS cache manager monitors the state of the network element in real time and updates a cache list of the MME in real time according to the state of the network element; and if the MME does not inquire the corresponding entry, executing a step of inquiring the network element address of the service user from the DNS server.
Further, after receiving the query result of the DNS server, the MME stores the query result in the cache list.
Further, after the MME stores the query result in the cache list to reach a predetermined validity period, the corresponding entry in the cache list is deleted.
Further, the monitoring, by the DNS cache manager, the network element status in real time, and updating, in real time, the cache entry in the DNS server according to the network element status specifically includes: the DNS cache manager monitors the state of the network element in real time; when the DNS cache manager monitors that the network element is out of service due to fault, the DNS cache manager informs the DNS server to delete the corresponding cache entry.
Further, when the DNS cache manager monitors that the network element is accessed to provide services, the DNS cache manager informs the DNS server to add corresponding cache entries.
Further, the monitoring of the network element state by the DNS cache manager in real time, and the updating of the cache list in the MME in real time according to the network element state specifically includes: the DNS cache manager monitors the state of the network element in real time; when the DNS cache manager monitors that the network element fault exits the service, the DNS cache manager sends a deletion message to the MME; the MME judges whether the cache list comprises corresponding cache entries; if the cache list comprises corresponding cache entries, the MME deletes the corresponding cache entries; and if the cache list does not comprise the corresponding cache entry, the MME ignores the deletion message.
By the method, the cache entries in the DNS server can be updated in real time according to the state of the network elements in the network, and when a user initiates a request, the network elements can be allocated to the user according to the cache entries updated in real time, so that the network elements are selected for the user according to the real-time state of the network, service faults caused by the fact that the fault network elements are selected for the user are prevented, and user experience is reduced.
According to another aspect of the present invention, there is provided a domain name addressing system comprising: a mobile management entity MME, which is used for receiving a network access request from a user; inquiring a network element address of a service user from a DNS (domain name system) server; appointing a service network element for a user according to a query result obtained from a DNS server; the DNS server is used for inquiring the cache entries and sending the inquiry result to the MME; and the DNS cache manager is used for monitoring the network element state in real time and updating the cache entries in the DNS server in real time according to the network element state.
Further, the MME has a cache list; the MME is also used for inquiring according to the self cache list after receiving a network access request from a user; if the MME inquires the corresponding item, a service network element is appointed for the user according to the inquiry result; if the MME does not inquire the corresponding item, executing a step of inquiring the network element address of the service user from the DNS server; the DNS cache manager is also used for monitoring the network element state in real time and updating the cache list in the MME in real time according to the network element state.
Further, the MME is further configured to store the query result in the cache list after receiving the query result from the DNS server.
Further, the MME is further configured to delete the corresponding entry in the cache list after the query result is stored in the cache list and the predetermined validity period is reached.
Further, the DNS cache manager is specifically configured to: monitoring the state of the network element in real time; and when the network element fault is monitored to exit the service, informing the DNS server to delete the corresponding cache entry.
Further, the DNS cache manager is further configured to: and when the network element access providing service is monitored, informing the DNS server to add a corresponding cache entry.
Further, the DNS cache manager is specifically configured to: monitoring the state of the network element in real time; when the network element fault is monitored to exit the service, a deletion message is sent to the MME; the MME is also used for judging whether the cache list comprises corresponding cache entries; if the cache list comprises corresponding cache entries, deleting the corresponding cache entries; and if the cache list does not comprise the corresponding cache entry, ignoring the deletion message.
The domain name addressing system can update the cache entries in the DNS server in real time according to the state of the network elements in the network, and can allocate the network elements to the user according to the cache entries updated in real time when the user initiates a request, so that the network elements are selected for the user according to the real-time state of the network, service faults caused by the fact that the fault network elements are selected for the user are prevented, and user experience is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of a network element domain name addressing method in the prior art.
Fig. 2 is a flow chart of one embodiment of a domain name addressing method of the present invention.
Fig. 3 is a flow chart of another embodiment of a domain name addressing method of the present invention.
Fig. 4 is a flowchart of an embodiment of updating a network element status in the domain name addressing method of the present invention.
Fig. 5 is a flowchart of another embodiment of updating the network element status in the domain name addressing method of the present invention.
FIG. 6 is a schematic diagram of one embodiment of a domain name addressing system of the present invention.
Fig. 7 is a schematic diagram of another embodiment of a domain name addressing system of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
A flow diagram of one embodiment of a domain name addressing method of the present invention is shown in fig. 2.
In step 201, the MME receives a request for network access from a user.
In step 202, the MME queries the DNS server for the network element address serving the user.
In step 203, the DNS server queries according to its own cache entry. The cache entries of the DNS server are updated by the DNS cache manager in real time. The DNS cache manager can monitor the state of the network element in real time and update cache entries in the DNS server in real time according to the change of the state of the network element.
In step 204, the DNS server sends the query result to the MME, and the MME selects a corresponding serving network element for the user according to the query result.
By the method, the cache entries in the DNS server are updated in real time according to the state of the network elements in the network, and when a user initiates a request, the network elements can be selected for the user according to the cache entries updated in real time, so that the network elements are selected for the user according to the real-time state of the network, service faults caused by the fact that the faulty network elements are selected for the user are prevented, and user experience is reduced.
In an embodiment, after receiving the query result from the DNS server, the MME stores the query result in its cache list. By the method, the MME can cache a part of the query results, so that each query is prevented from being forwarded to the DNS server, and the query efficiency is improved.
In an embodiment, after the MME stores the query result in the cache list to reach a certain predetermined validity period, the cache entry corresponding to the query result is deleted. By the method, the MME cache list can be prevented from overflowing, the cache list can be cleaned in time, and the timeliness of information stored in the MME cache list is improved.
A flow diagram of another embodiment of the domain name addressing method of the present invention is shown in fig. 3.
In step 301, the MME receives a network access request from a user.
In step 302, the MME queries its own cache list, and determines whether the query result can be obtained from its own cache list. The MME cache list is updated by the DNS cache manager in real time. The DNS cache manager can monitor the state of the network element in real time and clear the cache entry corresponding to the fault network element from the MME cache list in real time.
In step 303, it is determined whether the MME queries the corresponding cache entry. If the MME inquires, go to step 307; if the MME fails to query the corresponding cache entry from the self cache list, step 304 is performed.
In step 304, the MME queries the DNS server for the network element address of the serving user.
In step 305, the DNS server queries according to its own cache entry. The cache entries of the DNS server are updated by the DNS cache manager in real time. The DNS cache manager can monitor the state of the network element in real time and update cache entries in the DNS server in real time according to the change of the state of the network element.
In step 306, the DNS server sends the query result to the MME. The MME may store the query result in its own cache list.
In step 307, the MME selects a corresponding serving network element for the user according to the query result queried from the self cache list or the query result obtained from the DNS server.
By the method, the MME can firstly inquire the cache list of the MME and inquire the DNS server under the condition that the inquiry is not successful, so that the interaction burden of the MME and the DNS server is reduced, and the domain name addressing efficiency is improved.
In one embodiment, when the network element status changes, the DNS cache manager updates the cache entries stored in the DNS server and/or MME. In one embodiment, as shown in FIG. 4.
In step 401, the DNS cache manager monitors the status of the network element in real time, and when the network element fails and exits from service, the DNS cache manager learns in time to execute step 402 and step 404.
In step 402, the DNS cache manager sends a delete message to the DNS server asking the DNS server to delete the relevant cache entry for the failed network element.
In step 403, after receiving the deletion message, the DNS server deletes the relevant cache entry of the failed network element.
In step 404, the DNS cache manager sends a delete message to the MME, requesting the MME to delete the relevant cache entry of the failed network element in the cache list.
In step 405, after the MME receives the delete message, if the cache list includes the relevant cache entry of the failed network element, the MME performs a delete operation; and if the cache list does not have the relevant cache entries of the fault network elements, ignoring the deletion message.
By the method, when the network element fails and exits from the service, the DNS cache manager can timely inform the DNS server and the MME of deleting the related cache entry of the failed network element, and the MME can not provide the failed network element for a user no matter according to the cache list of the MME or the feedback result of the DNS server, so that the user experience is improved.
In the domain name addressing method, when a new network element provides service in the network or a fault network element is recovered, the DNS cache manager can timely acquire the state of the network element. In one embodiment, as shown in FIG. 5.
In step 501, the DNS cache manager learns timely that the network element is accessed to provide a service.
In step 502, the DNS cache manager sends a message to the DNS server, and adds a cache entry corresponding to the network element in the DNS server.
By the method, when a new network element provides service in the network or a fault network element is recovered, the DNS cache manager can timely acquire and add related cache entries in the DNS server, so that a query result of the network element can be provided for a user, a domain name addressing result is optimized, and the utilization rate of the network element is improved.
A schematic diagram of one embodiment of a domain name addressing system of the present invention is shown in fig. 6. The MME 601 obtains a network access request from a user. The MME 601 queries the DNS server 602 for the network element address of the service user, and the DNS server 602 feeds back the result to the MME 601 after querying the result according to the cache entry, and the MME 601 will select the service network element for the user according to the query result. The cache entries of the DNS servers are updated in real time by the DNS cache manager 603. The DNS cache manager 603 can monitor the status of the network element in real time, and update the cache entry in the DNS server in real time according to the change of the status of the network element.
The domain name addressing system can update the cache entries in the DNS server in real time according to the state of the network elements in the network, and can allocate the network elements to the users according to the cache entries updated in real time when the users initiate requests, so that the users are guaranteed to be allocated with the proper network elements according to the real-time state of the network, and the situation that the users are allocated with the failed network elements to cause reduction of user experience is prevented.
In an embodiment, after receiving the query result from the DNS server, the MME stores the query result in its cache list. In the domain name addressing system, the MME can cache a part of query results, so that each query is prevented from being forwarded to the DNS server, and the query efficiency is improved.
In an embodiment, after the MME stores the query result in the cache list to reach a certain predetermined validity period, the cache entry corresponding to the query result is deleted. The domain name addressing system can ensure that the MME cache list does not overflow, and the cache list is cleaned in time, so that the timeliness of information stored in the MME cache list is improved.
In an embodiment, after receiving a network access request from a user, the MME queries its cache list, and determines whether a result can be queried from its cache list. The MME cache list is updated by the DNS cache manager in real time. The DNS cache manager can monitor the state of the network element in real time and clear the cache entry corresponding to the fault network element from the MME cache list in real time. If the MME finds the corresponding cache entry in the cache list of the MME, a service network element is selected for the user according to the query result, otherwise, the network element address of the service user is queried from the DNS server.
In the domain name addressing system, the MME can firstly inquire the cache list of the MME and inquire the DNS server under the condition that the inquiry is not successful, so that the interaction burden of the MME and the DNS server is reduced, and the domain name addressing efficiency is also improved.
In one embodiment, when the network element failure exits the service, the DNS cache manager learns in time and sends a delete message to the DNS server and the MME. The DNS server deletes the related cache entries of the failed network elements; if the MME stores the relevant cache entry of the failed network element, the MME also performs a deletion operation. According to the domain name addressing system, when the network element fails and exits from service, the DNS cache manager can timely inform the DNS server and the MME of deleting the related cache entry of the failed network element, so that the MME can not provide the failed network element for a user no matter according to the cache list of the MME or according to the feedback result of the DNS server, and the user experience is improved.
In an embodiment, when a new network element provides service in the network or a failed network element recovers, the DNS cache manager can timely acquire the state of the network element, and send a message to the DNS server, and add a cache entry corresponding to the network element in the DNS server.
According to the domain name addressing system, when a new network element provides service in a network or a fault network element is recovered, the DNS cache manager can timely acquire and add related cache entries in the DNS server, so that the service network element can be allocated to a user, a domain name addressing result is optimized, and the utilization rate of the network element is improved.
A schematic diagram of another embodiment of the domain name addressing system of the present invention is shown in fig. 7. The DNS cache manager monitors the status of the network element in real time, and the network elements SGW, PGW1, PGW2 inform the DNS cache manager of the status in real time via messages 701, 702, 703. When the network element PGW1 fails, the DNS cache manager obtains the failure state of the PGW1 through the message 702, informs the MME of the failure of the network element PGW1 through the message 704, and if the MME has a cache entry of the network element, performs a deletion operation; the DNS cache manager informs the DNS server of the failure of PGW1 by message 705 that the DNS server deletes the cache entry for PGW 1. When a user initiates a network access request to the MME, the MME acquires a query result from the DNS server and provides the PGW2 as a service network element for the user, so that the problem of providing a fault network element for the user is avoided, and the user experience is optimized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (10)

1. A method for domain name addressing, comprising:
after receiving a request from a user network access, a mobile management entity MME inquires according to a cache list of the MME, if the MME inquires a corresponding item, a service network element is appointed for a user according to an inquiry result, wherein a domain name system DNS cache manager monitors the state of the network element in real time and updates the cache list of the MME in real time according to the state of the network element;
if the MME does not inquire the corresponding item, inquiring a network element address of a service user from a DNS (domain name system) server, wherein the network element comprises a packet transport network (PGW) gateway and a Service Gateway (SGW);
the DNS server inquires according to the cache entries and sends the inquiry result to the MME, wherein the DNS cache manager monitors the state of the network element in real time and updates the cache entries in the DNS server in real time according to the state of the network element;
and the MME appoints a service network element for the user according to the query result.
2. The method of claim 1, wherein the MME stores the query result in a cache list after receiving the query result from the DNS server.
3. The method of claim 2, wherein the corresponding entry in the cache list is deleted after the MME stores the query result in the cache list for a predetermined validity period.
4. The method of claim 1, wherein the monitoring of the status of the network element by the DNS cache manager in real time, and the updating of the cache entry in the DNS server in real time according to the status of the network element specifically comprises:
the DNS cache manager monitors the state of the network element in real time;
when the DNS cache manager monitors that the network element fault exits from the service, the DNS cache manager informs the DNS server to delete the corresponding cache entry; and/or the presence of a gas in the gas,
and when the DNS cache manager monitors that the network element is accessed to provide services, the DNS cache manager informs the DNS server of adding corresponding cache entries.
5. The method of claim 1, wherein the DNS cache manager monitors a network element status in real time, and updating the cache list in the MME in real time according to the network element status specifically comprises:
the DNS cache manager monitors the state of the network element in real time;
when the DNS cache manager monitors that the network element fault exits the service, the DNS cache manager sends a deletion message to an MME; the MME judges whether a cache list comprises corresponding cache entries;
if the cache list comprises corresponding cache entries, the MME deletes the corresponding cache entries;
and if the cache list does not comprise the corresponding cache entry, the MME ignores the deletion message.
6. A domain name addressing system, comprising:
a mobile management entity MME, which is used for receiving a network access request from a user; inquiring according to a self cache list, and if an MME inquires a corresponding item, assigning a service network element for a user according to an inquiry result, wherein a domain name system DNS cache manager monitors the state of the network element in real time and updates the cache list of the MME in real time according to the state of the network element; if the MME does not inquire the corresponding item, inquiring a network element address of the service user from a Domain Name System (DNS) server; appointing a service network element for a user according to a query result obtained from a DNS server;
the DNS server is used for inquiring the cache entries and sending the inquiry result to the MME; monitoring the state of a network element in real time, and updating a cache list in the MME in real time according to the state of the network element;
and the DNS cache manager is used for monitoring the network element state in real time and updating the cache entries in the DNS server in real time according to the network element state.
7. The system of claim 6, wherein the MME is further configured to store the query result in a cache list after receiving the query result from the DNS server.
8. The system of claim 7, wherein the MME is further configured to delete the corresponding entry in the cache list after the query result is stored in the cache list for a predetermined validity period.
9. The system of claim 6,
the DNS cache manager is specifically configured to: monitoring the state of the network element in real time;
when the fact that the network element fails to exit the service is monitored, the DNS server is informed to delete the corresponding cache entry; and/or when monitoring that the network element accesses to the provided service, informing the DNS server to add a corresponding cache entry.
10. The system of claim 6,
the DNS cache manager is specifically configured to: monitoring the state of the network element in real time; when the fact that the network element fails to exit the service is monitored, sending a deleting message to the MME;
the MME is also used for judging whether the cache list comprises corresponding cache entries; if the cache list comprises corresponding cache entries, deleting the corresponding cache entries; and if the cache list does not comprise the corresponding cache entry, ignoring the deletion message.
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