KR20130007254A - Method and apparatus for supporting sever access using anycast address in heterogeneous network environment - Google Patents

Abstract

PURPOSE: A server connection supporting method and an apparatus thereof using an anicast are provided to supply anicast address about handover supporting servers without signaling with a network device. CONSTITUTION: A server address obtaining unit(11) obtains an anicast address about a server system supporting handover. A server address storing unit(12) manages the obtained anicast address. The server address storing unit stores the anicast address about the server system by access network type. A server address supplying unit(13) transmits the anicast address about the server system which supports the handover. [Reference numerals] (10) Server access supporting device; (11) Server address obtaining unit; (12) Server address storing unit; (13) Server address providing unit; (AA) Terminal

Description

Method and apparatus for supporting server access using anycast address in heterogeneous networks and heterogeneous network environment

The present invention relates to a method and apparatus for supporting a server connection, and more particularly, to a method and apparatus for supporting a terminal connecting to a server providing a service in a heterogeneous network.

In general, anycast refers to communication between a single sender and some receivers closest to the group. An anycast address represents a set of interfaces belonging to multiple nodes, and a packet designated as an anycast address is delivered to a single interface, which is the closest interface identified by the address. The closest interface here means that the routing distance is close, and the anycast address is used for one-to-one communication delivered to a single interface. Typical examples of anycast addresses are DNS servers or '6to4 Relay' routers.

When assigning anycast addresses to routers only, the use of anycast services is limited to the functionality of the router, so assign anycast addresses to a set of servers that provide various services to assign anycast addresses to more types of services. Measures are being developed for use.

The terminal checks the anycast address and transmits the packet by referring to the routing table in the router. For example, all routing entries for Anycast server A, server B, and server C exist in the routing table, and distance values are set. It is described. The server A selects a small distance and forwards anycast packets.

As such, the terminal may request a service by checking the anycast address of the server while referring to the routing table of the router, and thus a processing load due to signaling between the terminal and the router is generated, and the processing operation at the terminal is also increased.

Disclosure of Invention Problems to be Solved by the Invention An object of the present invention is to provide a method and apparatus for supporting an access to a server by obtaining an anycast address for servers providing a service supporting handover in a heterogeneous network. will be.

A method according to an aspect of the present invention for the above problem is a method for a server connection support device to support the connection of the terminal to the handover support server system, the server connection support device receiving a query message from the terminal; Extracting radio access network type information from the query message; Obtain an anycast address of a handover support server system corresponding to the extracted radio access network type information from a server address storage unit in which an anycast address for a server system supporting handover for each radio access network type is stored and managed. Making; And transmitting an anycast address of the obtained handover support server system to the terminal.

In this case, when the terminal intends to handover from the first radio access network to the second radio access network, the terminal transmits an inquiry message including radio access network type information for the second radio access network to the server access device.

A method according to another aspect of the present invention is a method in which a server connection support apparatus supports a connection of a terminal to a handover support server system, wherein the server connection support apparatus is previously connected to a terminal connected to a first radio access network. Determining whether a set event occurs; When the preset event occurs, transmitting, by the server connection supporting apparatus, an Anycast address for a server system that supports handover to at least one second radio access network different from the first radio access network to the terminal. It includes.

In this case, the preset event may be applied when the radio signal strength with the first radio access network to which the terminal is connected is reduced to or below a set value, or when the resource of the first radio access network to which the terminal is connected is used by the terminal. This may be less than the resources required for processing.

In addition, the method according to another aspect of the present invention, a server connection support device is a method for supporting a terminal to connect to the handover support server system, a server system that the server connection support device supports handover for each radio access network type Obtaining an anycast address for; And a server to which the server connection supporting apparatus is connected to the first radio access network at predetermined intervals, wherein the server system supports handover to at least one second radio access network different from the first radio access network. Sending an anycast address for the request.

In the method according to the present invention having such a feature, the terminal may be a terminal having two or more radio access interfaces, in which case the device provides an Anycast address of the handover support server system to the terminal, thereby providing a heterogeneous radio. Support handover service between access networks.

In addition, an apparatus according to another aspect of the present invention includes a server address obtaining unit for obtaining an anycast address for a server system that supports handover; A server address storage unit for storing and managing the obtained anycast address, and storing an anycast address for a server system supporting handover for each access network type; And a server address for transmitting an anycast address to a terminal connected to a first radio access network, the server system supporting handover to at least one second radio access network different from the first radio access network. Contains wealth.

According to an embodiment of the present invention, in a heterogeneous network, a terminal can be easily provided with an anycast address for handover support servers in close proximity without signaling with a network device such as a router. In addition, the service can be easily provided from the handover support servers using the provided Anycast address.

Accordingly, the terminal can easily obtain anycast addresses of servers without performing a separate calculation process for obtaining an anycast address, and can reduce processing load on a network and a system according to a plurality of signaling between the terminal and a network device. have.

1 is a diagram illustrating a network environment according to an embodiment of the present invention.
2 is an exemplary diagram illustrating a format of an anycast address according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a structure of a server connection support apparatus according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a server access support method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a method of selecting a destination for receiving data in a wireless communication system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a schematic diagram of a heterogeneous network according to an embodiment of the present invention.

As shown in FIG. 1, a heterogeneous network according to an embodiment of the present invention includes a server connection support apparatus 10 and a plurality of handover support server systems 21, 22,..., 2n, n respectively located in different networks. = 1, 2, 3, ..., hereinafter, "20" as a representative number for convenience of explanation), and the terminal 30.

The terminal 30 includes a radio access interface, that is, a multimode interface, for performing connection with different types of networks. Here, the multi-mode interface may be implemented in an integrated form of various types of radio access interfaces for heterogeneous networks, or may be defined as a term including a plurality of radio access interfaces attached to the terminal 30. Such a multimode interface may include various types of radio access interfaces such as a WiMAX network interface, a WiFi network interface, a universal mobile telecommunications system (UMTS) network interface, and a long term evolution (LTS) network interface.

The handover support server systems 20 respectively located in different networks provide the handover support service in the terminals 30 through the corresponding network. In detail, the handover support server system 20 is a system that supports handover when the terminal intends to perform handover from its own network to a network other than the network it supports. For example, a WiMAX handover support server system supporting a WiMAX access network may be configured to perform handover from a wireless access network (eg, WiFi or UMTS) other than the WiMAX access network to the WiMAX access network. This handover is supported.

Each handover support server system 20 is assigned an anycast address.

2 illustrates an example of an anycast address format according to an embodiment of the present invention.

As shown in FIG. 2, the anycast address includes a subnet prefix, which is an interface prefix for identifying a specific link, and an anycast ID. The server access support apparatus 10 according to an embodiment of the present invention stores and manages an anycast address for handover support server systems, and stores an anycast address according to a setting condition according to an embodiment of the present invention. )

3 is a diagram illustrating a structure of a server connection support apparatus 10 according to an exemplary embodiment of the present invention.

The apparatus for supporting access to a server 10 according to an exemplary embodiment of the present invention includes a server address obtaining unit 11, a server address storing unit 12, and a server address providing unit 13 as shown in FIG. 3.

The server address obtaining unit 11 obtains anycast addresses for handover support server systems, and stores and manages them in the server address storage unit 12. The server address obtaining unit 11 receives an anycast address for handover support server systems from a separate anycast routing device (not shown), or receives a neighbor discovery protocol message provided from the handover support server system. And anycast address included therein.

When obtaining the anycast address from the handover support server system, the server address obtaining unit 11 checks the radio access network type of each handover support server system. For example, each radio access network type is WiMAX, WiFi, UMTS, LTS, etc., and the radio access network type of the WiMAX handover support server system is "WiMAX". In order to distinguish the radio access network type, different values are designated for each type. For example, "1" is assigned to the "WiMAX" access network type.

The radio access network type of each handover support server system checked by the server address acquisition unit 11 is used by the server address storage unit 12 and the server address providing unit 13 to store and provide anycast addresses of the handover support system. do.

The server address storage unit 12 stores and manages anycast addresses of handover application support server systems provided by the server address obtaining unit 11.

Table 1 below shows an example of an anycast address for handover support server systems according to an exemplary embodiment of the present invention.

Radio access network type Anycast address 0: WiFi Anycast address of the server system with WiFi handover support 1: WiMAX Anycast address of a WiMAX handover enabled server system 2: UMTS Anycast address of the UMTS handover support server system 3: LTE Anycast Address of LTE Handover Supported Server System 4 ~ 7: Reserved

According to an embodiment of the present invention, the server address storage unit 12 stores and manages an anycast address for a server system supporting handover for each radio access network type as shown in Table 1.

In addition, information indicating a distance value (distance value according to a routing protocol) for handover support server systems may be stored for each anycast address.

The server address providing unit 13 provides anycast addresses for application server systems to the terminal. Specifically, when there is a request from the terminal, or every set period or when a set event occurs, the server system that supports handover to at least one radio access network other than the radio access network to which the terminal is connected. It provides an anycast address for the terminal. For example, the terminal provides type information of a new type of radio access network to be handed over when inquiring about the handover support system, and the server address providing unit 13 provides type information included in the received query. The Anycast address of the relevant handover support server system is found from the server address storage unit 12 and provided to the terminal.

Next, a method for supporting server connection according to an embodiment of the present invention will be described.

4 is a flowchart illustrating a server access support method according to an embodiment of the present invention.

In a first network where the terminal 30 uses, for example, a first radio access technology (here described herein as a WiFi radio access network), a second radio using a second network radio access technology. When handing over to a second network using an access technology (described here as an example of a WiMAX radio access network), the server connection supporting apparatus 10 queries the anycast address information of the system for handover support. (S100).

The terminal 30 transmits a query message including radio access network type information of a new type of second network, that is, a WiMAX radio access network, to the server connection support apparatus 10. In this case, the query message may include "1" which is radio access network type information of the WiMAX radio access network.

The server connection support apparatus 10 receives a query message from the terminal 30 and extracts radio access network type information included in the received query message. Based on the extracted type information, the server 30 stores the Anycast address information of the handover support server system from the server address storage unit 12 or the server address acquisition unit 11 and responds to the terminal 30.

In detail, the server address obtaining unit 11 of the server access support apparatus 10 receives corresponding anycast information from the server address storage unit 12 based on the radio access network type information extracted from the query message. Here, an Anycast address of the WiMAX handover support server system is provided based on the radio access network type information "1".

The server address obtaining unit 11 transmits the obtained anycast address of the WiMAX handover support server system to the server providing unit 13, and the server providing unit 13 transmits the anycast address of the received WiMAX handover support server system. To transmit to the terminal 30.

In addition, the server connection support apparatus 10 may provide anycast address information of the handover support server system to the terminal 30 according to a setting condition without a request from the terminal. For example, a push-type anycast address of a server system that supports handover to at least one radio access network different from the radio access network to which the terminal is currently connected for each set time is provided.

In addition to periodically providing an Anycast address of the handover support server system to the terminal 30, the server connection support apparatus 10 may send an Anycast of the handover support server system to the terminal 30 when a specific event occurs. Provide an address (S120). For example, the server connection supporting apparatus 10 may be configured to reduce the strength of a radio signal with a radio access network to which a terminal is currently connected to be less than or equal to a predetermined value, or to apply an application service in which a resource of a radio access network to which a terminal is currently connected is used at a terminal. When a specific event occurs, such as a case in which there is less than a resource necessary for processing traffic, the processing of the traffic cannot be provided smoothly, the terminal 30 supports handover to at least one other radio access network. Provide the anycast address of the server system.

 In addition, when providing the anycast address of the handover support server system to the terminal, the server connection support apparatus 10 may provide a list of anycast addresses. The list of anycast addresses includes anycast addresses per interface set. When the terminal 30 receives the list of anycast addresses, the terminal 30 may select a desired anycast address from the list of anycast addresses.

As described above, when the terminal 30 is provided by querying the server connection supporting apparatus 10 or is provided with the anycast address of the handover supporting server system from the server connecting supporting apparatus 10 without a separate request, the terminal 30 ) Is provided with services from the corresponding handover support server systems 20 using an anycast address (S130).

In FIG. 4, the terminal 30 queries the server access support apparatus 10 to receive an Anycast address of the handover support server system (S100 and S110) or supports handover from the server access support apparatus 10 without a separate request. Although shown with an Anycast address of the server system (S120), this process can be performed separately.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (12)

In the method in which the server connection support device supports the connection of the terminal to the handover support server system,
Receiving, by the server connection supporting apparatus, a query message from a terminal;
Extracting radio access network type information from the query message;
Obtain an anycast address of a handover support server system corresponding to the extracted radio access network type information from a server address storage unit in which an anycast address for a server system supporting handover for each radio access network type is stored and managed. Making; And
Transmitting an anycast address of the obtained handover support server system to the terminal;
Including, server connection support method. The method of claim 1, wherein
When the terminal intends to handover from the first radio access network to the second radio access network, the terminal transmits a query message including radio access network type information for the second radio access network to the server access device. How to apply. In the method in which the server connection support device supports the connection of the terminal to the handover support server system,
Determining, by the server connection supporting apparatus, whether a preset event occurs for a terminal connected to a first radio access network; And
When the preset event occurs, transmitting, by the server connection supporting apparatus, an Anycast address for a server system that supports handover to at least one second radio access network different from the first radio access network to the terminal.
Including, server connection support method. The method of claim 3, wherein
The preset event is
And a case in which the radio signal strength with the first radio access network to which the terminal is connected decreases below a set value. The method of claim 3, wherein
The preset event is
And a case in which resources of the first radio access network accessed by the terminal are less than resources necessary for processing application service traffic used in the terminal. In the method in which the server connection support device supports the connection of the terminal to the handover support server system,
Acquiring, by the server connection supporting apparatus, an anycast address for a server system supporting handover for each radio access network type; And
A server system for supporting a handover to at least one second radio access network different from the first radio access network to a terminal connected to the first radio access network at predetermined intervals. Steps to Send Anycast Address
Including, server connection support method. The method according to any one of claims 1, 3 and 6
The terminal is a terminal owning two or more radio access interfaces, and the server connection support apparatus provides an Anycast address of the handover support server system to the terminal to support handover services between heterogeneous radio access networks. How to apply. A server address obtaining unit obtaining an anycast address for a server system supporting handover;
A server address storage unit for storing and managing the obtained anycast address, and storing an anycast address for a server system supporting handover for each access network type; And
A server address providing unit for transmitting an anycast address for a server system supporting handover to at least one second radio access network different from the first radio access network to a terminal connected to a first radio access network.
Server support apparatus comprising a. The method of claim 8, wherein
The server address providing unit
When there is an address request from the terminal, in the case of a set period, and if at least one of the case of a preset event occurs, and transmits the anycast address to the terminal. 10. The method of claim 9,
The preset event is
When the wireless signal strength with the first radio access network to which the terminal is connected decreases to or below a set value, and
When the resources of the first radio access network accessed by the terminal is less than the resources required for processing the application service traffic used by the terminal
And at least one of the following. 9. The method of claim 8,
And the server address obtaining unit receives an anycast address for handover support server systems from an anycast routing device. The method of claim 8, wherein
And the server address obtaining unit receives a neighbor search protocol message provided from a handover support server system and obtains an anycast address included therein.

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