KR20100061002A - Sysem and method for providing handover based media independent handover function - Google Patents

Abstract

PURPOSE: A hand over providing system MIHF(Media Independent Handover Function)-based and a method are provided to remove need of mounting MIHF protocol stack to a mobile terminal thereby preventing power quantity increase of the mobile terminal and resource quantity increase of wireless interval due to various signaling traffic of a handover process. CONSTITUTION: If a L2 handover trigger signaling is received from a mobile terminal, a L2 trigger receiver(212) transmits link down information to present access router PoS(Point of Service). If a handover start is requested from the present access router, the first handover operation unit(214) transmits a response signal to the present access router. If a handover of MIHF-BS(Base Station) of target network is requested from the present access router, the first handover request unit(216) transmits handover information to the present access router.

Description

Syef and Method for Providing Handover Based Media Independent Handover Function}

The present invention relates to a handover method, and more particularly, to a system and method for providing handover between heterogeneous networks based on a media independent handover function (hereinafter referred to as 'MIHF').

Proxy Mobile IPv6 (hereinafter referred to as 'PMIPv6') provides a mobile terminal with IPv6 session continuity through mobility in a situation where the mobile terminal is not involved in mobility management.

PMIPv6 enables session continuity through handover when moving the network to any kind of mobile terminal without IP mobility.

Considering several aspects, PMIPv6 is expected to be a viable IP mobility solution for future radio access network environments than basic MIPv6.

The IEEE 802.21 standardized working group has addressed a standard issue called MIHF, which provides mobility independent of heterogeneous access network technology characteristics below the L3 layer.

MIHF uses a well-defined interface to provide services to upper layers and to provide independent handovers for heterogeneous transmission media.

The existing MIHF-based PMIPv6 handover method has a problem that the basic concept between the IEEE 802.21 MIHF and PMIPv6 collides. In other words, PMIPv6 is a protocol for reducing the burden on a mobile terminal and a protocol for avoiding a separate protocol stack. However, in the existing MIHF-based PMIPv6 handover scheme, MIHF must be installed in the mobile terminal.

Therefore, the existing MIHF-based PMIPv6 handover method uses the MIHF protocol in the mobile terminal with limited performance and resources, thus increasing the power consumption of the mobile terminal and resource usage in the wireless section due to MIHF-related signaling traffic during the handover process. Practical problems such as an increase occur.

In addition, since all mobile terminals currently being used do not have a MIHF function, there is a problem that handover is impossible when a mobile terminal having no MIHF function moves over a network.

In order to solve such a problem, the present invention is to provide a system and method for providing PMIPv6 handover between heterogeneous networks using MIHF.

In accordance with an aspect of the present invention, there is provided a method for providing a handover according to an aspect of the present invention, wherein (a) a base station receiving handover trigger signaling from a mobile station before the mobile station hands over a signal indicating that the current link is lost. Transmitting to a first access router in a current network; (b) the first access router exchanging a first Media Independent Handover message with an information server to obtain information about an accessible neighboring network; (c) the first access router exchanges a second intermediary irrelevant handover message with the neighboring network to determine a handover target, and inquires about resource availability information of the neighboring network to which the mobile station moves and accesses; Performing a handover based on the information to determine a second access router of the target network to which the target network is connected; (d) the first access router exchanging a third intermediary unrelated handover message with the base station to request handover to the base station of the target network to request handover; And (e) the first access router sends a fourth medium independent handover message to the second access router to inform the mobile terminal that it will access the second access router, requesting to perform a handover to execute the handover. It includes a step.

In accordance with an aspect of the present invention, a handover providing system includes: a base station transmitting link down information indicating that a current link is lost when receiving handover trigger signaling from a mobile terminal; And when receiving the link down information, accesses an information service server to obtain information about an accessible neighbor network, requests resource availability information of the neighbor network to access routers of one or more neighbor networks, and receives the resource. It includes a target network to perform the handover based on the availability information and the access router to request the handover by determining the access router of the target network.

According to the above-described configuration, since the present invention does not need to mount the MIHF protocol stack in the mobile terminal, problems such as increased power usage of the mobile terminal and increased resource usage of the wireless section due to various signaling traffic during the handover process occur. Do not.

The present invention has an effect that PMIPv6 handover is possible when moving a MIHF-based network, even if the mobile terminal does not have any MIHF function.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement 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 a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “block”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

Hereinafter, terms used in the present invention are defined as follows.

The present network is a network where the mobile terminal is currently communicating (the network before the mobile terminal handovers), and the candidate network is a candidate network to which the mobile terminal can move and access. Target network is a network to which the mobile terminal is connected after the mobile terminal moves to complete a handover, and refers to one of the candidate networks.

The access router includes a mobility access gateway (hereinafter referred to as 'MAG') and a point of service (PoS).

PoS is a PoS inside an access router and is a component that exchanges MIH messages with MIHF-BS in addition to basic MIH message exchange.

MAG is a key component of PMIPv6 that performs IP mobility functions on behalf of mobile terminals.

The current network, candidate network and target network described above include a MIHF-base station (hereinafter referred to as a BS) and an access router.

1 is a block diagram schematically showing the overall configuration of a system for providing a vertical PMIPv6 handover using MIHF according to an embodiment of the present invention.

Handover providing system according to an embodiment of the present invention includes a mobile terminal 100, the current network 200 and the candidate network (400). Here, at least one candidate network 400 exists as a handover capable network to which the mobile terminal can move and access.

The mobile terminal 100 checks the signal quality from the MIHF-BS 210 of the current network 200 connected at the current L2 layer, determines the handover according to the determined threshold value, and if the handover is determined, triggers the L2 handover. L2 trigger transmitter (not shown) for transmitting the signaling to the MIHF-BS 210 of the current network 200. At this time, the mobile terminal 100 does not mount the MIHF and transmits the L2 handover trigger signaling to the MIHF-BS 210 of the current network 200 to activate the PMIPv6.

The current network 200 includes a MIHF-BS 210 and a current access router 220. Here, the current access router 220 refers to an access router of the current network 200 in which the mobile terminal 100 is communicating.

Next, the MIHF-BS 210 will be described in detail with reference to FIG. 2.

2 is a block diagram schematically showing the internal configuration of the MIHF-BS 210 of the current network of the handover providing system according to an embodiment of the present invention.

The MIHF-BS 210 includes an L2 trigger receiver 212, a first handover operation unit 214, and a first handover request unit 216.

When the L2 trigger receiver 212 receives the L2 handover trigger signaling from the mobile terminal 100, the L2 trigger receiver 212 transmits link down information indicating that the current link is disconnected to the current access router 220.

Here, L2 handover trigger signaling is implemented using a message determined in the L2 technical standard.

When the first handover operation unit 214 receives a handover start request from the current access router (PoS) 220, the first handover operation unit 214 transmits a response signal to prepare for the handover start in response to the current access router (PoS) 220. To send.

When the first handover request unit 216 is requested to perform a handover from the current access router (PoS) 220 to the MIHF-BS 410 existing in the target network 400, the first handover request unit 216 performs a handover in response thereto. Information indicating this is transmitted to the current access router (PoS) 220.

Next, the current access router 220 will be described in detail with reference to FIG. 3.

3 is a block diagram schematically illustrating an internal configuration of a current access router 220 in a current network of a handover providing system according to an exemplary embodiment of the present invention.

The current access router 220 includes a neighbor network information acquisition unit 222, a second handover operation unit 224, a handover target determination unit 226, and a second handover request unit 228.

When the neighbor network information acquisition unit 222 receives link down information indicating that the current link is lost from the MIHF-BS 210, the neighbor network information access unit 222 connects to the media independent information service server 300 and connects to the neighbor network. Obtain information about

The second handover operation unit 224 requests the MIHF-BS 210 to start handover and prepares for handover start.

The handover target determiner 226 requests and receives resource availability information of the candidate network 400 from the access routers (PoS) 420 of the one or more candidate networks 400, and performs handover based on the resource availability information. A target network 400 and an access router (new MAG) 420 are determined to perform.

The second handover request unit 228 requests the MIHF-BS 210 of the current network 200 to perform a handover to the MIHF-BS 410 existing in the target network 400, and the target network 400. The mobile station 100 informs the access router (PoS) 420 of the mobile station 100 to access the access router (new MAG) 420 of the target network 400, and requests to perform handover.

4 is a view for explaining a method for providing vertical PMIPv6 handover using MIHF according to an embodiment of the present invention.

The mobile terminal 100 determines the signal quality from the MIHF-BS 210 of the current network 200 connected at the current L2 layer, and determines the handover according to a predetermined threshold.

If the mobile terminal 100 determines the handover, it transmits the L2 handover trigger signaling to the MIHF-BS 210 of the current network 200 (S100).

When the MIHF-BS 210 of the current network 200 receives the L2 handover trigger signaling from the mobile terminal 100, the MIHF-BS 210 generates a MIH_Link_Down Indiaton indicating that the current link is disconnected to obtain neighbor network information. Transmission to the router 220 (S102).

Currently, the access router 220 obtains information on the neighboring network accessible through the transmission of the MIH_Get_Information Request and the reception of the MIH_Get_Information Response with the Media Independent Information Service server 300 (S104 and S106). Here, MIH_Get_Information Request and MIH_Get_Information Response may be used in different terms like the first MIH message.

The MIHF-BS 210 generates MIH_Net_HO_Candidate_Query Request and transmits it to the current access router 220 to initiate the handover (S108). Subsequently, the current access router 220 generates a MIH_Net_HO_Candidate_Query Response to accept the handover in response to the MIH_Net_HO_Candidate_Query Request and transmits it to the MIHF-BS 210 (S110).

Currently, the access router 220 collects MAG information of the candidate network 400 and transmits MIH_N2N_HO_Query Resource Request to the access routers 420 of the one or more candidate networks 400 to query the availability of resources (S112). .

The current access router 220 receives the MIH_N2N_HO_Query Resource Response from the candidate access routers 420 in response to the MIH_N2N_HO_Query Resource Request (S114). The aforementioned MIH_N2N_HO_Query Resource Request and IH_N2N_HO_Query Resource Response may be used in different terms like the second MIH message.

The current access router 220 determines the target network 400 and the new access router (New MAG) 420 to perform handover based on the resource availability information of the candidate network 400 obtained in the received MIH_N2N_HO_Query Resource Response. (S116).

The current access router 220 transmits the MIH_Net_HO_Commit Request to the MIHF-BS 210 of the current network 200 and requests to perform handover to the MIHF-BS 410 existing in the target network 400 (S118).

The current access router 220 receives the MIH_Net_HO_Commit Response from the MIHF-BS 210 of the current network 200 and receives a response to perform a handover (S120). The aforementioned MIH_Net_HO_Commit Request and MIH_Net_HO_Commit Response may be used in other terms like the third MIH message.

The current access router 220 sends a MIH_N2N_HO_Commit Request to the new access router (PoS) 420 of the target network 400, informing that the mobile terminal 100 will move and access the new access router (NMAG) soon. Request to perform (S122).

The new access router (PoS) 420 of the target network 400 responds to transmit a MIH_N2N_HO_Commit Response to the current access router 220 to perform a handover (S124). The aforementioned MIH_N2N_HO_Commit Reques and MIH_N2N_HO_Commit Response may be used in other terms like the fourth MIH message.

When the new access router (PoS) 420 of the target network 400 receives the MIH_N2N_HO_Commit Request, it requests and obtains the profile of the mobile terminal 100 from the policy store 500 to perform the basic PMIPv6 protocol. do.

The mobile terminal 100 releases the L2 connection with the MIHF-BS 210 of the current network 200 and performs L2 connection with the MIHF-BS 410 of the target network 400 (L2 handover) (S126). .

The new access router (New MAG) 420 of the target network 400 checks the "MN Attachment" defined in PMIPv6 and transmits a Router Advertisement message to the mobile terminal 100 (S128). Here, the router advertisement message may be generated by a router solicitation in the L3 layer of the mobile terminal 100 or may be periodically transmitted by a new access router 420 of the target network 400 regardless of the router request.

The mobile terminal 100 sets an IP address using a router request message.

The new access router (NMAG) 420 and local mobility anchor (LMA) 600 of the target network 400 update the proxy binding to update the current location of the mobile terminal 100. PBU) and Proxy Binding Acknowledgment (PBA) signaling message are exchanged (S130).

When the PMIPv6 handover process is complete, a two-way tunnel is created between the new access router 420 of the target network 400 and the local mobility anchor. The mobile terminal 100 communicates through the generated bidirectional tunnel.

After performing the PMIPv6 handover procedure, the new access router (PoS) 420 of the target network 400 performs an access router of the network before handing over the MIH_N2N_HO_Complete Request to perform the handover completion step. Current network 200) (S132). The access router of the previous network transmits the MIH_N2N_HO_Complete Response to the new access router (PoS) 420 of the target network 400 in response to the MIH_N2N_HO_Complete Request (S134).

The embodiments of the present invention described above are not implemented only by the apparatus and / or method, 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.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a block diagram schematically showing the overall configuration of a system for providing a vertical PMIPv6 handover using MIHF according to an embodiment of the present invention.

2 is a block diagram schematically showing the internal configuration of the MIHF-BS of the current network of the handover providing system according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an internal configuration of a current access router in a current network of a handover providing system according to an embodiment of the present invention.

4 is a view for explaining a method for providing vertical PMIPv6 handover using MIHF according to an embodiment of the present invention.

Claims (6)

(a) the base station receiving the handover trigger signaling from the mobile terminal, transmitting a signal indicating that the current link is lost to the first access router of the current network before the mobile terminal handovers; (b) the first access router exchanging a first Media Independent Handover message with an information server to obtain information about an accessible neighboring network; (c) the first access router exchanges a second intermediary irrelevant handover message with the neighboring network to determine a handover target, and inquires about resource availability information of the neighboring network to which the mobile station moves and accesses; Performing a handover based on the information to determine a second access router of the target network to which the target network is connected; (d) the first access router exchanging a third intermediary unrelated handover message with the base station to request handover to the base station of the target network to request handover; And (e) The first access router sends a fourth medium independent handover message to the second access router to inform the mobile terminal that it will access the second access router, requesting the handover to be performed to perform the handover. step Handover providing method comprising a. According to claim 1, After the step (e), performing a handover, The mobile terminal releasing an L2 connection with a first access router of the current network and performing an L2 connection with a second access router of the target network; The second access router of the target network generates and sends a router advertisement message to the mobile station, and updates a proxy binding update message and a proxy binding acknowledgment message to update a local mobility anchor and a current location of the mobile station. Exchanging; Creating a two-way tunnel between the second access router of the target network and the local mobility anchor; And Exchanging a handover complete message for performing a handover complete step between the first access router and the second access router. Handover providing method comprising a. A base station for transmitting link down information indicating that a current link is lost when receiving handover trigger signaling from a mobile station; And When receiving the link down information, accesses an information service server to obtain information about an accessible neighbor network, requests resource availability information of the neighbor network to access routers of one or more neighbor networks, and receives the resource availability. An access router which requests a handover by determining a target network to perform a handover and an access router of the target network based on the information. Handover providing system comprising a. The method of claim 3, The base station comprises: An L2 trigger receiver configured to transmit the link down information to the access router of a current network in which the mobile station is communicating when receiving the handover trigger signaling from the mobile station; A first handover operation unit receiving a request for starting handover from the access router and transmitting a response signal to accept the handover to the access router; And A first handover request unit for receiving a handover request from the access router to a base station existing in the target network and transmitting a response signal to perform the handover to the access router; Handover providing system comprising a. The method of claim 3, The access router, A neighbor network information acquisition unit which accesses the information service server and obtains information on a neighboring network accessible by receiving the link down information from the base station; A second handover operation unit which transmits a handover start request message to the base station to start handover; A handover target for requesting and receiving resource availability information of the neighboring network from access routers of the one or more neighboring networks and determining an access router of the target network and the target network to perform handover based on the resource availability information. Decision unit; And A second handover requesting the base station to perform a handover to a base station existing in the target network, and informing the access router of the target network to inform the mobile terminal of access to the access router of the target network and performing a handover to the access router of the target network; Request Department Handover providing system comprising a. The method of claim 3, And the mobile station is not equipped with a media independent handover function (MIHF), and the base station is equipped with the media independent handover function (MIHF).

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