CN1717112A - Mobile node, a control method thereof, and a mobile node control program - Google Patents

Abstract

The invention is to provide a mobile node which can be automatically switched to a proper port, a mobile node control method and a mobile node control procedure. In order to solve problems of the prior art, the mobile node comprises a generating unit to generate control information of ports; an informing unit to inform the control information informed by the ports to an upper layer protocol; a path control unit which confirms the informed control information based on connection or updates paths, or both confirms the informed control information and updates paths.

Description

The control method of mobile node and mobile node and mobile node controlling program

Technical field

The mobile node that the present invention relates to have a plurality of interfaces, each interface is controlled, the control method and the mobile node controlling program of mobile node.

Background technology

Along with being the progress of the communication system of representative with the mobile communication, numerous common carriers provides various means of communication.These means of communication be that the condition of representative has nothing in common with each other with available place and cost, the user is carried multiple interfaces on a terminal, according to circumstances can switch.And along with the progress that with mobile IP is the IP mobility control technology of representative, the user can proceed communication under the situation of not recognizing various interface.

Utilize the NIC (network interface unit) (for example, with reference to non-patent literature 1,2) of the mobile node of mobile IP according to Movement detection or Move detection change grouping transmitting-receiving usefulness.

[non-patent literature 1] D.Johnson et.al, " Mobility Support in IPV6 ", IETF RFC3775, June 2004.

[non-patent literature 2] C.Perkins et.al, " IP Mobility Support forIPV4 ", IETF RFC3220, Jan 2002.

[non-patent literature 3] Ryuji WAKIKAWA, Keisuke UEHARA, Fumio TERAOKA, " MIBsocket:An Integrated Mechanism to Munipulate General NetworkInformation in Mobile Communications ", IEICE TRANS.COMMUN., Vol.E84 B, No.8 August 2001.

Yet, have following problem in the above-mentioned background technology.

A problem is that communicator must manually switch.

Even the another one problem is a method of automatically switching communicator, also be with reference to the line status that provides by link layer, the transmitting-receiving interface of determination data grouping only, and the interface beyond the interface that is determined is not carried out specific processing.

In this case, the trouble that the manual switchover of communicator causes is from few speech, and in being equipped with the terminal of a plurality of interfaces, from the viewpoint of power consumption, the power-saving control of non-option interface also is necessary.Therefore, non-option interface also should be set as function stop being positioned under the situation that link range, its connectivity obtain guaranteeing.

In addition, in utilizing the mobile node of mobile IP, losing with the attainability of old link is that opportunity changes and is used to the NIC that divides into groups to receive and dispatch, therefore has the problem that communication moment disconnects that takes place.Promptly, though mobile IP has detection does not have arrival from the electric wave of the base station that communicates function, thereby but do not have the function that the availability of confirming new NIC is changed into the NIC that can be used for communicating by letter, so do not arrive from detecting electric wave, till switching to new NIC and finishing during in can not communicate.

The problem that explanation takes place in such mobile node with reference to Fig. 1.

Following situation is described: cellular basestation 2 and WLAN base station 3 are connected on the communication network 1, and the mobile node 4 with honeycomb NIC and WLAN NIC moves to the zone of WLAN base station 3 from the zone of cellular basestation 2.Here, some is overlapping in the zone of the zone of cellular basestation 2 and WLAN base station 3.In Fig. 1, place A is the zone of cellular basestation 2, and place B, C and D are the regional equitant parts of the zone and the WLAN base station 3 of cellular basestation 2, and place E is the zone of WLAN base station 3.

In this case, though mobile node 4 and cellular basestation 2 between link in move to place D from place A, can not switch the link with WLAN base station 3 yet owing to move to place E from place D, cut off and cellular basestation 2 between link.

Then, mobile node 4 receives Router adversement message on the link of WLAN, the use of beginning WLAN link.

Therefore, by behind the D of place, can not communicate during before the use of the link of beginning WLAN.

Summary of the invention

Therefore, the purpose of this invention is to provide and a kind ofly can automatically switch to the mobile node of suitable interface, the control method and the mobile node controlling program of mobile node.

In addition, another object of the present invention provide a kind of can not take place to cut off because of link cause the mobile node of communication disruption, the control method and the mobile node controlling program of mobile node.

In order to solve above-mentioned problem, mobile node of the present invention is the mobile node with a plurality of interfaces, and it has: generation unit, and it generates the control information at each interface; The circular unit, its control information from each interface circular is circulated a notice of to upper layer; The path control unit, it carries out at least one in internuncial affirmation and the routing update according to the control information of being circulated a notice of.

Like this, for mobile node, can select appropriate interface automatically.And can be controlled to the communication disruption that the link cut-out causes can not take place.

In addition, the control method of mobile node of the present invention is the control method with mobile node of a plurality of interfaces, has following steps: generate the control information at each interface; Reception is from the control information of each interface circular; Control information is circulated a notice of to upper layer; According to the control information of being circulated a notice of, carry out at least one in internuncial affirmation and the routing update.

Like this, can control, make mobile node select appropriate interface automatically.And can be controlled to and can not take place to cut off the communication disruption that causes because of link.

In addition, the control program of mobile node of the present invention is to make the mobile node with a plurality of interfaces bring into play functional programs as following unit: generation unit generates the control information at each interface; Crosspoint, and each interface between exchange of control information; Extract the unit out, from control information, extract the attribute information of interface out; Memory cell, attribute information storage; Selected cell, selection has the interface of the attribute that conforms to a predetermined condition; The circular unit is circulating a notice of to upper layer from the control information of each interface circular.

Like this, can make the mobile node performance select the function of interface suitable automatically.

According to embodiments of the invention, can realize to automatically switch to the control method and the mobile node controlling program of the mobile node and the mobile node of interface suitable.

And, can realize can not taking place cutting off the mobile node of the communication disruption that causes and the control method and the mobile node controlling program of mobile node because of link.

Description of drawings

Fig. 1 is the key diagram that is illustrated in the work of the mobile node that moves between different system.

Fig. 2 is the overall structure figure of the mobile communication system of one embodiment of the present of invention.

Fig. 3 is the functional block diagram of the mobile node of one embodiment of the present of invention.

Fig. 4 is the functional block diagram of the path control agent of one embodiment of the present of invention.

Fig. 5 is the functional block diagram of the Interface Control Department of one embodiment of the present of invention.

Fig. 6 is the flow chart of work of the mobile communication system of expression one embodiment of the present of invention.

Fig. 7 is the flow chart of work of the mobile communication system of expression one embodiment of the present of invention.

Fig. 8 is the flow chart of work of the Interface Control Department of expression one embodiment of the present of invention.

Fig. 9 is the flow chart of work of the Interface Control Department of expression one embodiment of the present of invention.

Figure 10 is the flow chart of work of the Interface Control Department of expression one embodiment of the present of invention.

Figure 11 is the flow chart of work of the Interface Control Department of expression one embodiment of the present of invention.

Figure 12 is the flow chart of work of the Interface Control Department of expression one embodiment of the present of invention.

Figure 13 is the key diagram of power saving effect that is used to illustrate the Interface Control Department of one embodiment of the present of invention.

Figure 14 is the key diagram of work of the mobile node of expression one embodiment of the present of invention.

Figure 15 is the block diagram of logical construction of the mobile node of expression one embodiment of the present of invention.

Figure 16 is the flow chart of work of the mobile node of expression one embodiment of the present of invention.

Figure 17 is the flow chart of work of the mobile node of expression one embodiment of the present of invention.

Embodiment

Next, with reference to the description of drawings embodiments of the invention.

At the whole figure that are used for illustrating embodiment, the part with identical function is used same-sign, and the repetitive description thereof will be omitted.

The mobile communication system that embodiments of the invention relate to is based on the mobile communication system of IP, be combine with the 4th generation honeycomb mode wireless access be the system of the major techniques such as IP mobility control of the various link-layer technologies of representative and the attainability end to end that in the IP layer, realizes the IP grouping.As link-layer technologies, utilize the honeycomb mode for example comprise HSDPA (high-speed downlink packet accesss) and the 4th generation advanced person such as wireless access and WLAN etc. in interior multiple link-layer technologies, as IP mobility control, utilize the improvement layering move IP (HMIP-B), mobile IP (MIP), as the FMIP of the extended mode of mobile IP etc.

In the present embodiment, for mobile communication system is described, be that example describes with the paging work in the paging control mode, switch operating in the normal mode.

The mobile communication system of embodiments of the invention is described with reference to Fig. 2 to Fig. 4.

As shown in Figure 2, mobile communication system of the present invention has: path control agent MA and PA; Communication link system AP1 and BS1 that couple in router AR1 and AR2 are connected with couple in router AR1; The communication link system BS2 that is connected with couple in router AR2; Mobile node (mobile node) the MN #1 that can be connected with BS2 with communication link system AP1, BS1.Path control agent MA is connected by IP network with AR2 with PA, couple in router AR1.

When the mobile communication system of present embodiment receives the grouping that sends to mobile node MN #1 (for example portable terminal) at path control agent PA, send the page notification grouping by paging domain to this mobile node MN #1, obtain the positional information (subnet) of this mobile node MN #1, determine this transmission packets destination.

Then, with reference to Fig. 3 mobile node MN #1 is described.

Mobile node MN #1 utilizes network interface unit NIC #1 to NIC #n, by communication link system and couple in router AR, is connected on the IP network.

Mobile node MN #1 has: network interface unit NIC #1 to NIC #n (n is positive integer); The many Interface Control Departments MIM (MultipleInterface Manager) that is connected with network interface unit NIC #1 to NIC #n (below be called Interface Control Department); The control part 15 that is connected with network interface unit NIC #1 to NIC #n and Interface Control Department MIM; The upper layer-management portion 100 that is connected with control part 15; The updating location information portion 110 that is connected with upper layer-management portion 100.Upper layer-management portion 100 and updating location information portion 110 have constituted the path control part.

Interface Control Department MIM uses link layer information, considers power saving performance, and uses the Preference of priority to select suitable NIC from a plurality of NIC according to expression, realizes the seamless switching between different link-layer technologies.

Interface Control Department MIM has: the control information exchange portion 11 that is connected with network interface unit NIC #1 to NIC #n; The attribute information extraction unit 13 that is connected with control information exchange portion 11; The storage part 12 that is connected with attribute information extraction unit 13; The interface card selection portion 14 that is connected with storage part 12, network interface unit NIC #1 to NIC #n, control part 15.

Be respectively arranged with MAC Address (link layer address) among network interface unit NIC #1 to the NIC #n.Network interface unit NIC #1 can be connected with communication link system AP1, and NIC #2 can be connected with BS2 with communication link system BS1.

Control information exchange portion 11 generates the control information at each network interface unit, carries out the exchange of control information with network interface unit NIC #1 to NIC #n.Attribute information extraction unit 13 is extracted the attribute information of network interface unit out from the control information that is exchanged by control information exchange portion 11.For example, extract out attachable communication link system kind, communications cost, power measurement values, user's hobby, for example reflected information as the priority of the behaviour in service of commercial use etc. etc.The attribute information that storage part 12 storages are extracted out by attribute information extraction unit 13.In addition, storage part 12 storage mobile node controlling programs.The mobile node controlling program makes the function of mobile node MN #1 performance control information exchange portion 11, attribute information extraction unit 13, interface card selection portion 14, wherein, the control information that control information exchange portion 11 generates at each interface, and each interface between exchange of control information, attribute information extraction unit 13 is extracted the attribute information of interface out from control information, the information stores of being extracted out in storage part 12, interface card selection portion 14 selects to have the interface card of the attribute that conforms to a predetermined condition, and circulating a notice of to upper layer from the control information of each interface circular.Interface card selection portion 14 selects to have the network interface unit of the attribute that conforms to a predetermined condition.For example, make the Preference of the use priority of expression network interface unit NIC,, select network interface unit according to Preference.

Control part 15 makes mobile node MN #1 according to mode of operation, for example normal mode or paging control mode and work.When working under normal mode, mobile node MN #1 carries out mobile management work based on mobile IP or its expansion technique by control part 15.When working under paging control mode, mobile node MN #1 stops mobile management work by control part 15, sends the paging login grouping that is used to form paging domain to path control agent PA.

The more upper layer (for example network layer) of upper layer-management portion's 100 contrast link layers is controlled.For example, upper layer-management portion 100 with path control agent MA cooperative work, carries out the control in the IP layer as required, realizes the transmitting-receiving of IP grouping.In addition, upper layer-management portion 100 sends the paging login grouping of the paging domain that is used to form mobile node MN #1 to path control agent PA.Here, can comprise IP address and MAC Address in the paging login grouping.In addition, upper layer-management portion's 100 use MAC Address and predetermined IP address (network layer address) are carried out address resolution.

Positional information changing unit 110 is carried out internuncial affirmation and routing update according to the order of upper layer-management portion 100.For example, the change of carrying out default gateway is handled.

Then, with reference to Fig. 4 path control agent PA is described.

Path control agent PA has: paging login grouping receiving and transmitting part 31; The paging domain formation portion 32 that is connected with paging login grouping receiving and transmitting part 31; The paging domain management department 33 that is connected with paging domain formation portion 32; The page notification grouping sending part 35 that is connected with paging domain management department 33; The detection of packets portion 34 that is connected with page notification grouping sending part 35; The transmitted in packets portion 37 that is connected with detection of packets portion 34; The page notification that is connected with transmitted in packets portion 37 is confirmed grouping acceptance division 36.

Paging login grouping receiving and transmitting part 31 receives the paging login grouping of paging domain that send from mobile node MN #1, that be used to form this mobile node MN #1, and inputs to paging domain formation portion 32.In addition, paging login grouping receiving and transmitting part 31 receives the MAC Address corresponding with the network interface unit NIC that is determined from mobile node MN #1.In addition, paging login grouping receiving and transmitting part 31 is by couple in router AR1, communication link system AP1, network interface unit NIC #1 and Interface Control Department MIM, send the grouping of paging login response to mobile node MN #1, the grouping of paging login response is used for circular and has formed paging domain.

Paging domain formation portion 32 forms the paging domain of mobile node MN #1 according to the paging login grouping of being imported.For example, paging domain formation portion 32 is according to the information of the expression subnet that comprises in the paging the imported login grouping, and the paging domain of mobile node MN #1 is made as subnet #1 and #2.

The paging domain of the 33 management mobile node MN #1 of paging domain management department.For example, paging domain management department 33 associates preservation to " IP address ", " MAC Address " and " paging domain ".For example, 33 management " IP_MN #1 " of paging domain management department are as the IP address, and management " MAC Address #1 " is as MAC Address, and management " subnet #1, #2 " is as paging domain.That is, paging domain management department 33 is according to distributing to the IP address " IP_MN #1 " of mobile node MN #1 and the MAC Address " MAC Address #1 " that receives, the paging domain of management mobile node MN #1.

The IP grouping that the sends to mobile node MN #1 row cache of going forward side by side detects in detection of packets portion 34, and circular is to page notification grouping sending part 35.In addition, detection of packets portion 34 is according to the indication of transmitted in packets portion 37, and what send institute's buffer memory is the IP grouping of destination with mobile node MN #1.

Page notification grouping sending part 35 sends the page notification grouping according to the circular from detection of packets portion 34 to the subnet #1 and the #2 of the paging domain that constitutes mobile node MN #1.

Page notification confirms that grouping acceptance division 36 receives the page notification affirmation grouping of sending from mobile node MN #1, and circular is given transmitted in packets portion 37.

Transmitted in packets portion 37 extracts out from detection of packets portion 34 with the page notification that is received and confirms the IP grouping that grouping is corresponding, the subnet of the mobile node MN #1 that comprises in confirming to divide into groups according to page notification, the IP grouping that transmission is extracted out.

Couple in router AR1 and AR2 carry out Route Selection and handle according to the IP address.For example, the couple in router AR1 Route Selection of carrying out the subnet #1 that is connected with BS1 with communication link system AP1 is handled.In addition, the couple in router AR2 Route Selection of carrying out the subnet #2 that is connected with communication link system BS2 is handled.

Communication link system AP1, BS1 are connected with couple in router AR with BS2, control according to the transmission that MAC Address is carried out in the link layer.

In the mobile communication system of present embodiment, not to appending function as communication link system (access point) AP1, the BS1 of network node and BS2, couple in router AR1 and AR2 and other control device.

Then, the logical construction of the Interface Control Department MIM that explanation is installed in mobile node MN #1 with reference to Fig. 5.

Interface Control Department MIM is positioned at above the link layer in the protocol stack of mobile node MN #1, should be used for maybe seeing that from upper layer agreement the existence of Interface Control Department MIM is hidden.

Upper layer with control information exchange API corresponding to each network interface unit NIC, for example carry out the exchange of control information and grouping between the LAPI (link layer application programming interfaces).Here, LPAI makes commonization of control information of each link layer, with defined API under the purpose of upper layer exchange of control information, is to make the upper variety of protocol that is positioned at link layer or the Control work high speed of application, improves the means of communication quality.Control information exchange API as such for example has MIBsocket (for example, with reference to non-patent literature 3).

Interface Control Department MIM has Virtual Interface (VIF), Processor, ControlInterface (Control I/F).

Virtual Interface (VIF) is the virtual interface that Interface Control Department MIM keeps, and has 2 kinds, is about to upper layer as the Upper.VIF (U.VIF) of each NIC with the Lower.VIF (L.VIF) of NIC as upper layer.Interface Control Department MIM is by between the Virtual Interface, in the protocol stack of mobile node MN #1, with upper layer and lower layer exchange of control information.For example, Interface Control Department MIM has Upper.VIF #1～#n, Lower.VIF #1～#n (n is a positive integer).Upper.VIF #1～#n and upper layer carry out the exchange of control information.Lower.VIF#1～#n carries out the exchange of control information by LAPI NIC #1～LAPI NIC #n with network interface unit NIC #1～NIC #n.

Processor is an Executive Module of selecting optimum N IC.Processor makes the Preference of the use priority of expression network interface unit NIC according to parameter and selection algorithm that Control Interface described later sets, selects NIC according to Preference, and manages.In addition, Processor controls the management of needed timer and exchange, distribution and the disconnection of control information.And Processor not only carries out the processing of control information, also can carry out the buffer memory of packet and abandon, the distribution of input and output NIC.

Control Interface (control I/F) makes the input of the generation parameters needed can carry out Preference and algorithm etc., the switching of NIC itself.In addition, the interface that also has the information management that to carry out daily record output etc.

Then, the state of the network interface unit NIC of the MIM of specification interface management department management.As the state of network interface unit NIC, suppose to have 3 states: Active NIC, Receive NIC and Low Power NIC.

Active NIC is the state that carries out the transmitting-receiving of packet.Under this state, direct communicating control information.

Receive NIC is when NIC for example switches, and promptly changes under the situation of Active NIC, guarantees the connectivity of new Active NIC in order to make upper layer, and the function of permitting old Active NIC is closed the state that delays.In Receive NIC, though can carry out the reception of packet, control information is abandoned.

Low Power NIC carries out power-saving control, the pent state of function.Be the state of the NIC beyond Active NIC and the Receive NIC, under this state, do not carry out the transmitting-receiving of packet certainly, also do not carry out the link layer control of interface.

The work of the mobile communication system of present embodiment then, is described with reference to Fig. 6 and Fig. 7.

Connect the power supply of mobile node MN #1, in mobile node MN #1, set up network interface unit NIC (step S502).

The control information that control information exchange portion 11 generates at each network interface unit is with network interface unit NIC #1～#n exchange of control information (step S504).Attribute information extraction unit 13 stores in the storage part 12 from being extracted out the attribute information of interface card NIC #1～#n the control information that exchanges.Interface card selection portion 14 is according to predetermined condition, and Reference for example selects to have the interface card of qualified suitable attribute, and for example network interface unit NIC #1 (step S506) is set as Active NIC (step S508) to selected network interface unit.

Then, MAC Address and the predetermined IP address of the upper layer-management 100 use network interface unit #1 of portion, by Interface Control Department MIM, network interface unit NIC #1 and communication link system AP1, and couple in router AR1 between, carry out address resolution and handle (step S510).

Then, the work (step S512) of control part 15 beginning paging control modes.

Then, upper layer-management portion 100 is by Interface Control Department MIM, network interface unit NIC #1, communication link system AP1 and couple in router AR1, sends the MAC Address that includes network interface unit #1 and the paging login grouping (step S514～step S522) of predetermined IP address to path control agent PA.

Then, paging domain formation portion 32 forms the paging domain that is associated with MAC Address and the predetermined IP address of network interface unit #1, for example subnet #1 and #2 (step S524) according to the paging login grouping that receives.

Then, paging login grouping receiving and transmitting part 31 is by couple in router AR1, communication link system AP1, network interface unit NIC #1 and Interface Control Department MIM, use MAC Address and IP address, send the paging login response grouping (step S526～step S534) that is used for having circulated a notice of to form paging domain to the upper layer-management portion 100 of mobile node MN #1.

Then, with reference to Fig. 7, the MIM of specification interface management department utilizes link layer information, considers power saving performance, and selects the situation of suitable NIC from network interface unit NIC #1～#n according to Preference.

The control information that control information exchange portion 11 generates at each network interface unit is with network interface unit NIC #1～#n exchange of control information (step S602).

Attribute information extraction unit 13 stores in the storage part 12 from being extracted out the attribute information of network interface unit NIC #1～#n the control information that exchanges.

Interface card selection portion 14 is according to Reference, selection has the interface card of the suitable attribute that conforms to a predetermined condition, network interface unit #2 (step S604) for example, selected network interface unit is set for Active NIC (step S606), the network interface unit NIC #1 that is configured to Active NIC is so far set for Receive NIC (step S608).

Then, MAC Address and the predetermined IP address of the upper layer-management 100 use network interface unit #2 of portion, by Interface Control Department MIM, network interface unit NIC #2 and communication link system BS1, and couple in router AR1 between, carry out address resolution and handle (step S610).

Then, network interface unit NIC #1 uses the MAC Address that sets, and the communication link (step S612) between release and the communication link system AP1 is given Interface Control Department MIM (step S614) intelligence aids that work stops.

It is the grouping (step S616) of destination that the detection of packets portion 34 of path control agent PA receives with mobile node MN #1, and page notification grouping sending part 35 sends to couple in router AR1 that to be used for circulating a notice of having received with mobile node MN #1 be the page notification grouping (step S618) of situation of the grouping of destination.

Couple in router AR1 is to the paging domain of management mobile node MN #1, and promptly the communication link system AP1 of subnet #1 and #2 and BS1 send page notification grouping (step S620).

Communication link system AP1 and BS1 use MAC Address and IP address, send above-mentioned page notification grouping (step S622, step S24) to each network interface unit NIC #1 and #2.The page notification grouping that sends to network interface unit NIC #1 is not received (step S622).The page notification grouping that network interface unit NIC #2 receives is sent to upper layer-management 100 (step S626, the step S628) of portion.

Then, upper layer-management portion 100 is by Interface Control Department MIM, network interface unit NIC #2, communication link system BS1 and couple in router AR1, use MAC Address and IP address, send the page notification corresponding to path control agent PA and confirm grouping (step S630～step S638) with the page notification grouping.

Then, transmitted in packets portion 37 confirms grouping according to the page notification that receives, and what extract in detection of packets portion 34 buffer memory out is the grouping (step S640) of destination with mobile node MN #1.

Then, transmitted in packets portion 37 is by couple in router AR1, communication link system BS1, network interface unit NIC #2 and Interface Control Department MIM, use MAC Address and IP address, the grouping that with mobile node MN #1 is the destination is sent to upper layer-management 100 (the step S642～step S650) of portion.

Then, handle with reference to the selection of Fig. 8～network interface unit NIC that Figure 10 specification interface MIM of management department carries out.

Here, illustrate link layer use LAPI to be used as and last bit protocol between pass on the situation of the control information exchange API of control information.Be applicable to the situation of the control information exchange API that uses other too.

At first, employed control information is described.

In the present embodiment, use linkup.notification/request, poweroff.notification/request, linkdown/predown.notification and Active/Dormant.request.

Linkup.notification/request is the control information that circular/request network interface unit is in link (linkup) state.So-called linkup state is the communication of having established link layer, can carry out the state of the grouping transmitting-receiving of upper layer.

Poweroff.notification/request is the control information that the consumed power of circular/request network interface unit is in minimum state.Though be the exchange that to carry out control information, because most of function is set as disable, so can not carry out the state of the communication of link layer.

Linkdown/predown.notification is that circular network interface unit NIC is in the linkdown state or near the control information of linkdown state.So-called linkdown state is because terminal is in the state that waits outside the communication zone and can not carry out upper layer grouping transmitting-receiving.

Active/Dormant.request is the control information of the switching of the upper layer request of expression Preference.Expression IP layer is in Active and Dormant pattern.The Dormant pattern is the IP paging operating state that has defined the wait state of IP layer.

At first, the situation that explanation is selected once more according to the variation of the attribute of network interface unit with reference to Fig. 8.

Fig. 8 is the workflow of the upper layer Interface Control Department MIM when producing the control information of the change of following Preference.Produce the situation of the control information of the change of following Preference for upper layer, the change of the switching of the Preference that consider the migration of for example communications status and wait state, causes because of cost or the caused user's of access technology hobby, the Preference corresponding etc. with carrying out application.

At first, interface card selection portion 14 confirms whether current Active NIC is prepreerence NIC (step S702) in new Preference.When the result who confirms be current Active NIC when being not prepreerence NIC (step S702: be) carry out NIC Search described later and handle (step S704).On the other hand, and when current Active NIC is prepreerence NIC (step S702: not), end process.

In NIC Search handles, after utilizing Flag to confirm that Active NIC is not in unavailable state, interface card selection portion 14 is selected 1 (step S706) comparing by Search selected selection NIC and current Active NIC according to Preference.

Then, whether interface card selection portion 14 confirms to select the priority of NIC than current ActiveNIC height (step S708).When the priority of selecting NIC is higher than current Active NIC (step S708: be), current Active NIC is set for Receive NIC, selecting NIC to set Active NIC (step S710) for.

On the other hand, and when the priority of selecting NIC is high unlike current Active NIC (step S708: not), end process.

Then, by the Upper.VIF corresponding, linkup.notification is circulated a notice of to upper layer, for example the 3rd layer (Layer 3:L3) (step S712) with Active NIC.

Then, the upper layer that receives the circular of linkup.notification carries out internuncial affirmation and routing update to the NIC that is circulated a notice of.For example, carry out hand-off process (step S714).

Like this, even produce at upper layer under the situation of control information of the change of following Preference, also can automatically switch to suitable network interface unit.

Want to confirm whether Active NIC can not use, except above-mentioned Flag method, also can be used to confirm that the control information of connection status confirms one by one by in NIC Search handles, when having determined to select NIC, sending to Active NIC by Interface Control Department MIM.

The NIC that is configured to Active NIC is so far set for Receive NIC.Like this, owing to can receive Active NIC and Receive NIC two sides, can suppress the packet loss of upper layer.After the time of having passed through the hand-off process of finishing upper layer, the interface card selection portion 14 of Interface Control Department MIM sends poweroff.request to Receive NIC.The Receive NIC that receives poweroff.request closes function.Like this, can reduce the consumed power of non-option interface.

The work of Interface Control Department MIM when then, illustrating that with reference to Fig. 9 Active NIC in the use generates expression and is difficult to keep internuncial control information of link layer.

Generate the situation that expression is difficult to keep internuncial control information of link layer as Active NIC, consider following incident: terminal moves to situation outside the communication zone, detect interference etc. causes situations such as the situation of wireless quality deterioration or the NIC itself that is installed are removed.

At first, Active NIC sends predown.notification or linkdown.notification to upper layer (L3), and sends predown.notification or linkdown.notification (step S802) by the Upper.VIF corresponding with Active NIC to the control information exchange portion 11 of Interface Control Department MIM.

Then, control information exchange portion 11 confirms whether just carrying out NIC Search (step S804).(step S804: not), Flag is set for ON (step S808), end process under the situation of carrying out NIC Search.Like this, under the situation of having carried out NIC Search processing, only set up sign and can show the connectivity that can not guarantee Active NIC, this can be reflected in the executory NIC Search result.

On the other hand, under the situation of not carrying out NIC Search (step S804: be), carry out NIC Search described later (step S806).

Then, the control information exchange portion 11 of Interface Control Department MIM confirms whether to have found interface card NIC (step S810).Found that in control information exchange portion 11 interface card selection portion 14 is set current Active NIC for ReceiveNIC under the situation of interface card NIC (step S810: be), selecting NIC to set Active NIC (step S812) for.Do not find at Interface Control Department MIM under the situation of interface card NIC (step S810: not), end process.

Then, interface card selection portion 14 is circulated a notice of linkup.notification to upper layer (L3) (step S814) by the Upper.VIF corresponding with Active NIC.

Then, the upper layer that receives the circular of linkup.notification carries out internuncial affirmation and routing update to the NIC that is circulated a notice of.For example, carry out hand-off process (step S816).

Like this, even Active NIC in use generates under the situation of internuncial control information that expression is difficult to the position link layer, also can automatically switch to suitable network interface unit.

Then, with reference to Figure 10 the work of finding the Interface Control Department MIM under the current Active NIC situation high, spendable NIC of priority ratio is described.Interface Control Department MIM is not under the prepreerence situation at current Active NIC, confirms by NICSearch whether the high NIC of priority can use according to Preference timer period.In this case, by Interface Control Department MIM, close the function of Active NIC and Receive NIC NIC in addition.Therefore, whether Interface Control Department MIM is every just carries out NIC Search processing through preset time, investigate these NIC and can connect.

At first, control information exchange portion 11 confirms whether interface card selection portion 14 is carrying out NICSearch (step S902).When carrying out NIC Search (step S902: not), end process.On the other hand, when not when carrying out NIC Search (step S902: be), carry out NIC Search described later (step S904).

Then, the control information exchange portion 11 of Interface Control Department MIM confirms whether to have found interface card NIC (step S906).Do not find in control information exchange portion 11 under the situation of interface card NIC (step S906: not), end process.

Found in control information exchange portion 11 under the situation of interface card NIC (step S906: be) whether investigation Flag is ON (step S908).Be (step S908:OFF) under the situation of OFF at Flag, interface card selection portion 14 is current Active NIC and select NIC to compare, and selects 1 (step S910) according to Preference.Then, the interface card selection portion 14 investigation priority whether high (step S912) of selecting NIC.Under the not high situation of the priority of selecting NIC (step S912: not), end process.

Under the priority height (step S912: be) of selecting NIC and situation that Flag is ON (step S908:ON), interface card selection portion 14 is set current Active NIC for Receive NIC, and NIC changes into Active NIC (step S914) selection.

Then, by the Upper.VIF corresponding, linkup.notification is circulated a notice of to upper layer (L3) (step S916) with Active NIC.

Then, the upper layer that receives the circular of linkup.notification carries out successional affirmation and routing update to the NIC that is circulated a notice of.For example, carry out hand-off process (step S918).

Its result, Active NIC becomes Receive NIC before.The interface card selection portion 14 of Interface Control Department MIM sends poweroff.request to Receive NIC after the time of having passed through the hand-off process of finishing upper layer.Receive the Receive NIC closing function of poweroff.request.

Like this, even under the situation of finding the spendable NIC that the current Active NIC of priority ratio is high, also can automatically switch to suitable network interface unit.In addition, also can reduce the consumed power of non-option interface.

Can be according to each cycle that is provided with the MIM of defining interface management department execution NICSearch to handle of Preference.In addition, also can change according to change resume and the frequency of Active NIC.

But for the situation of the connection priority NIC higher, can consider that mobile node MN moves to the situation in the zone outside communication zone, the situation that communication quality has been enhanced or NIC itself is inserted into the situation that terminal is provided with than Active NIC.

The processing of NIC Search then, is described with reference to Figure 11.

In NIC Search handles, provide 3 conditions: as identifier, Search time of implementation and the priority decision retention time of the NIC of Search object by the processor of Interface Control Department MIM.

At first, control information exchange portion 11 sends the linkup.request of the control information that request functions open, starting Search time of implementation timer (TM1) (step S1002) to the whole NIC that become the Search object.

Whether the control information exchange portion 11 of affirmation Interface Control Department MIM receives the control information linkup.notification (step S1004) from initial connected NIC.

When control information exchange portion 11 receives control information linkup.notification from initial attachable NIC (step S1004: be), the decision of starting priority keeps timer (TM2) (step S1006).(step S1004: not), do not carry out any processing when control information exchange portion 11 does not receive control information linkup.notification from initial connected NIC.

Then, confirm any one whether overtime (step S1008) in Search time of implementation timer (TM1) and the priority decision reservation timer (TM2).

When among TM1 and the TM2 any one is overtime (step S1008: be), attribute information extraction unit 13 is extracted attribute information out from control information, confirm whether to exist the NIC that has circulated a notice of linkup.notification, that is, confirm whether to have received linkup.notification (step S1010).

Under the situation that has received linkup.notification (step S1010: be), as selecting NIC, circular is given processor (step S1012) to interface card selection portion 14 the NIC of limit priority wherein.(step S1010: not), do not carry out any processing under the situation that does not receive linkup.notification.

Then, interface card selection portion 14 is abandoned notification for the selecteed NIC that do not have beyond the selection NIC, and sends the poweroff.request (step S1014) as the control information of request closing function.Like this, can reduce the consumed power of non-option interface.

In NIC Search handles, also can receive the notification of NIC number by the quantity of the given NIC that installs of processor, carry out NIC and select.Like this, because Interface Control Department MIM can know the quantity of NIC,, can shorten the time that selection spent of NIC so, also can know whether to have responded all NIC even do not confirm the timer expired of step S1008.

In addition, also can according to this priority, limit quantity by the priority of the given current Active NIC of processor as the NIC of Search or alternative.Like this, because know whether the linkup.notification of Interface Control Department MIM reception is more upper than current Active NIC,, can shorten the time that selection spent of NIC so can finish according to the response of the high NIC of priority to select to handle.In addition, because know which grade is the priority of the linkup.notification that Interface Control Department MIM receives be,, can shorten the time that selection spent of NIC so can finish according to the response of prepreerence NIC to select to handle.

The work of Interface Control Department MIM in the mobile node MN of having carried a plurality of network interface unit then, is described with reference to Figure 12.

Here, the situation that mobile node MN #1 switches is described.

As mentioned above, the Interface Control Department MIM of present embodiment by the exchange that Upper.VIF carries out control information, is carried out the exchange of control information for upper layer by Lower.VIF for a plurality of NIC that carried.

At first, as the NIC #1 of Active NIC because the quality deterioration (step S1102) of link layer, circular control information predown.notification, this control information predown.notification is used for circulating a notice of to be difficult to keep internuncial situation (step S1104) of link layer.

Interface Control Department MIM circulates a notice of the predown.notification that is circulated a notice of to upper layer (step S1106).

Interface Control Department MIM is according to the workflow of reference Figure 11 explanation, and beginning NIC Search handles (step S1108).In this NIC Search, hypothetical target is NIC #2～NIC#N (N is a positive integer), collects notification.In addition, in NIC Search, carry out the inspection of Preference.That is, the whole NIC beyond Active NIC send the control information linkup.request (step S1110) that is used to open the NIC function.

In receiving each NIC of linkup.request, each link layer is judged connectivity, if can connect then circulate a notice of linkup.notification, if can not connect then circulate a notice of linkdown.notification (step S1112).

Extract linkup.notification out in the control information that the attribute information extraction unit 13 of Interface Control Department MIM obtains from NIC Search handles, put aside in the storage part 12.Interface card selection portion 14 is set at Active NIC to the NIC that wherein has limit priority, before ActiveNIC change into Receive NIC.

In addition, the interface card selection portion 14 of Interface Control Department MIM is to the linkup.notification (step S1114) of the new ActiveNIC of upper layer circular, after the notification that has all abandoned other NIC, the NIC beyond Active NIC and Receive NIC sends the control information poweroff request (step S1116) of request closing function once more.For ReceiveNIC, setting delays the timer that function is closed, and sends poweroffrequest (step S1118) in time-up.

Upper layer is carried out the control of following internuncial affirmation and routing update, for example hand-off process (step S1120) to the NIC that has circulated a notice of linkup.notification.

Carry out the cycle that NIC Search handles, for example when defined Preference timer is set completely the time (step S1122) at each of Preference, Interface Control Department MIM confirms the connectivity (step S1124) of each NIC.So-called Preference timer period is meant the starting of Preference timer for example and full.

At first, the whole NIC beyond the Active NIC being begun NIC Search handles.In this NIC Search handles, object is made as Active NIC whole NIC in addition, collect notification.In addition, in NIC Search, carry out the inspection of Preference.That is, each NIC that closes to function sends the control information linkup.request (step S1126) that request function is opened.

In each NIC opening function, confirm the connectivity of link layer, according to the result, if can connect then linkup.notification is circulated a notice of to Interface Control Department MIM, if can not connect then linkdown.notification is circulated a notice of to Interface Control Department MIM (step S1128).

The NIC that has limit priority among the linkup.notification that the interface card selection portion 14 of Interface Control Department MIM obtains during NIC Search is handled is as selecting NIC, with current Active NIC comparison priority.

In this case, if eligible, Interface Control Department MIM also can set a plurality of selection NIC.That is, also can circulate a notice of the linkup.notification of qualified NIC to upper layer.

Under the high situation of the priority ratio Active NIC that selects NIC, the interface card selection portion 14 of Interface Control Department MIM is changed into Receive NIC to Active NIC before selecting NIC to be set at new Active NIC.In this case, the interface card selection portion 14 of Interface Control Department MIM is to the linkup.notification (step S1130) of the new Active NIC of upper layer circular, after abandoning all notification of other NIC, the NIC beyond Active NIC and Receive NIC sends the poweroff request (step S1132) that request function is closed once more.In addition, Interface Control Department MIM sets for Receive NIC and delays the timer that function is closed, and sends poweroff request (step S1134) in time-up.

Upper layer is carried out the control that is accompanied by internuncial affirmation and routing update, for example hand-off process (step S1136) to the NIC that has circulated a notice of linkup.notification.

Under the low situation of the priority ratio Active NIC that selects NIC, Interface Control Department MIM abandons the notification as whole NIC of Search object, sends once more to be used to carry out the control information poweroff.request. that function is closed

Then, starting is used to begin the Preference timer that Search handles.

Like this, can make the mobile node that is equipped with a plurality of interfaces use suitable interface to proceed communication with qualified attribute.In addition, by closing the function of non-option interface, can improve power saving performance.

In addition, according to present embodiment, exchange of control information between Interface Control Department MIM and the interface, can only make have meet the interface performance function of attribute of given condition, carry out the exchange of control information with upper layer.

Do not meet under the situation of predetermined condition in the attribute change of interface, exchange of control information again perhaps under the situation that condition has taken place to change, and between the interface is found qualified interface.Can be periodically and the interface exchange of control information, and compare with current option interface, qualified interface found.

In the above-described embodiments, the control information that exchanges by between Interface Control Department MIM and network interface unit NIC has been described, judge the availability of NIC etc., automatically switch to the situation of appropriate interface, but after carrying NIC on the mobile node MN, under the situation of using the packet that receives by this NIC, equally also can judge the workability of NIC etc., automatically switch to suitable interface.

Then, the power saving effect of the MIM of specification interface management department.

The power saving effect of Interface Control Department MIM changed according to the time of network interface unit NIC performance function.NIC beyond the Active NIC under always in running order is because periodic NICSearch is operating state in the time at Search only.In addition, carrying out NIC when switching, because Receive NIC timer, the operating time of NIC is extended, thus about power saving effect.

The electricity-saving characteristic that NIC Search cycle and Search time are caused is described.

The mobile node MN that N NIC is installed is according to Search time T 2 and Preference timer T _PrefMake Interface Control Department MIM work.Suppose that the power that NIC #k is consumed is P _k, suppose priorities is k=1 in proper order, 2 ... N.

If prepreerence NIC#1 is Active NIC, then other NIC is poweroff, and the summation of the power that NIC consumed only is the P of NIC #1 ₁If the NIC beyond the override NIC is Active NIC, then in period T _PrefIn each NIC performance function in time T 2 only.Therefore, be p if hypothesis override NIC #1 is the probability of Active NIC, the consumed power P of the NIC in the time of then can representing MIM work as formula (1) _Min

[formula 1]

$P_{\min }=\mathrm{p\&alpha;}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="A20051008243000321.png,A20051008243000341.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+(1-p)\{{\mathrm{\&alpha;}}_{\mathrm{act}}{P}_{\mathrm{act}}+(\underset{k=1}{\overset{N}{\mathrm{\&Sigma;}}}{P}_k-P_{\mathrm{act}})({\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A20051008243000321.png,A20051008243000341.png"\; state="\{\{state\}\}">T</figure-callout>}}_2/T_{\mathrm{pref}})\}$

In formula (1), α is compared in the consideration power saving in Active NIC _k(＜1).If the operating time of NIC is long, then consider to reduce consumed power by the power-saving control of link layer, suppose with same NIC in periodically the consumed power during the opening/closing function is also different.In addition, in the MN that MIM is not installed, all NIC is in running order always, its consumed power P _NomimBe formula (2).

[formula 2]

$P_{\mathrm{no}\min }=\underset{k=1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_k{P}_k$

Though the consumed power of each NIC changes because of the kind of link layer or kind, operating state or the individual difference of NIC, below, as the stable state that NIC switches does not take place, estimate the consumed power that MIM produces.And, if the consumed power P of NIC monomer _kCompare α with power saving _kBe assumed to the mean value of whole NIC, the electricity-saving rate η (P that obtains according to having or not of MIM _Min/ P _Nomim) as follows.

η＝p(1/N)+(1-p)(1/N+((N-1)/αN)(T ₂/T _pref))

Figure 13 represents NIC Search cycle and the Search time ratio (T with MIM _Pref/ T ₂) corresponding electricity-saving rate.In this result, can know that limit priority NIC #1 does not become ActiveNIC, even under the high power saving condition more such, if time ratio T than (P=0, α=0.1) _Pref/ T ₂More than or equal to power saving than the inverse of α doubly, then the electricity-saving rate is less than 1.

The Search time T ₂Be the NIC response wait time corresponding, judge that by the link layer of the NIC that is equipped with MN decide before by the needed time for connectivity with the linkup request among the NIC Search.As mentioned above, if NIC Search period T _PrefMore than or equal to T ₂/ α then can obtain the power saving effect of MIM.

And, T _PrefHigher limit be target with the time that reverts to the higher NIC of priority.Even can use the NIC beyond the limit priority, the NIC function before regular NIC Search also is closed.That is, reverting to the desired value of the time of preferential NIC is T _Pref

The processing of Receive NIC timer and upper layer then, is described.

When the change of Active NIC had taken place, Active NIC before this became ReceiveNIC, only the reception that can divide into groups.And, when Receive NIC timer is expired, receive poweroff request, closing function from MIM.After but new NIC becomes connection status, from power saving Receive NIC timer short more good more.Yet, the purpose of Receive NIC is in the time before the control end of the upper layer that takes place following NIC to switch, can receive the grouping from old Active NIC, the length of Receive NIC timer is target with the time that Control work was spent of upper layer.

Be accompanied by the NIC switch operating of MIM, when subnet changed, the mobile control of IP layer was carried out switching controls to the IP layer.Therefore, the control of decision IP mobility is estimated how many Receive NIC timers of MIM is made as better in the example of upper layer.For the switching time of IP layer, consider connectivity at current router disappear judge and find before the new router time with carry out before the routing update time and.

The judgement time that connectivity disappears is in RFC2461 in the past, standard is back 30 seconds of receiving router advertisement (RA) or neighbour's advertisement (NA), and in mobile IP v 6, in the short cycle, circulate a notice of RA and utilize Advertise Interval to specify the judgement time.And, move among IP (HMIP-B) and the IPP in the improvement layering, proposed when from link layer circular linkup information, to send RS and transfer to the router retrieval process, shortened the judgement time.As mentioned above, the required time of response time in this case and routing update becomes standard.

In the above-described embodiments, the paging control and the switching controls of mobile communication system have been described, but also have been applicable to other situation, for example control during switching interface in communication as example.

Then, the processing of carrying out is described in upper layer.

In the present embodiment, is example so that mobile IP to be installed as the mobile node of the NIC of upper layer, the NIC with honeycomb and WLAN moves to the zone of WLAN base station from the zone of cellular basestation situation, with reference to the processing of Figure 14～Figure 17 explanation behind the MIM input link up.notification.Be not limited to mobile IP, also be applicable to other extended mode.

As shown in figure 14, be connected with cellular basestation 220 and WLAN base station 230 in communication network 200, the mobile node 240 with NIC of the NIC of honeycomb and WLAN moves to the zone of WLAN base station 230 from the zone of cellular basestation 220.In this case, some is overlapping in the zone of the zone of cellular basestation 220 and WLAN base station 230, place A is the zone of cellular basestation 220, and place B, C and D are the zone of cellular basestation 220 and the regional equitant zone of WLAN base station 230, and place E is the zone of WLAN base station 230.

The Radio Link that the mobile node 240 continuous search of present embodiment can connect in the B of place, carries out the establishment that is connected with WLAN base station 230.When the establishment of carrying out in the B of place with WLAN base station 230 that is connected, and when connecting an acknowledge message and input to MIM, MIM is judged as and has found new NIC, and the interface card selection portion 14 of MIM is carried out above-mentioned processing, judges whether and will connect.Be judged as under the situation that will connect in interface card selection portion 14, the upper layer-management of control part 15 orders portion 100 is connected with WLAN base station 230.Upper layer-management portion 100 is according to the order of control part 15, to 230 inquiry IP addresses, WLAN base station.For example send Router solicitation message, the IP address that has or not, managed of inquiry subnet etc.

WLAN base station 230 sends the relevant information of IP in response to Router solicitation message to mobile node 240.When mobile node 240 receives the relevant information of IP, this information is inputed to upper layer-management portion 100.Upper layer-management portion's 100 bases information relevant with the IP that is imported, the positional information of being logined is rewritten by indicating positions information-change portion 110.That is, the change of default gateway is carried out in indication.Positional information changing unit 110 is rewritten the positional information of being logined according to the indication from upper layer-management portion 100.That is, carry out the change of default gateway.The grouping that sends by honeycomb NIC and cellular basestation 220 paths like this, before sends by WLAN NIC and 230 paths, WLAN base station.

In addition, the Care-of Address of the upper layer-management 100 generation WLAN NIC of portion makes the Binding update message that this Care-of Address of login is used, and it is sent to home agent.Like this, by receiving by WLAN base station and WLAN NIC path that cellular basestation and honeycomb NIC path receive from grouping of network.

Like this, can confirm the link-attached stage of WLAN at place B, begin to send grouping by WLAN NIC path, utilization is given the address of WLAN NIC and is implemented to login to the Care-of Address of home agent, logining later grouping receives by WLAN NIC path, even thereby crossed place D at mobile node, arrived under the extra-regional situation of cellular basestation 220, because communicate by 230 paths, WLAN base station this moment, so can not take place to cut off the communication disruption that causes because of cellular link.

The logical construction of upper layer then, is described with reference to Figure 15.

Upper layer is positioned at above the MIM in the protocol stack of mobile node MN #1.In addition, from the agreement of upper layer with should be used for seeing that the existence of Interface Control Department MIM is hidden.In addition, driver is replaced by MIM.

Upper layer has the application program that is made of OS (operating system), the web browser of working etc. on OS.OS has the mobile IP v 6 module and IPv6, the Routing table that is connected with the mobile IP v 6 module, Neighbor cache that is connected with the Upper.VIF of MIM.

When the mobile IP v 6 module has been established new connection at certain NIC,, send the grouping of Router solicitation message, and receive the Router advertisement message corresponding with the Router solicitation message that is sent by this NIC path.And,, set default gateway according to Routeradvertisement message.In addition, give be positioned at nearest position the IP address of NIC that can confirm to be in communicable state as Care-of Address, sign in to home agent.

Routing table and Neighbor cache record the IP address of default gateway etc.

The work of upper layer then, is described with reference to Figure 15.

At place A, mobile node is in the zone of cellular basestation 220, uses honeycomb NIC, the transmitting-receiving of dividing into groups.At place B, mobile node is carried out following processing.

WLAN NIC and WLAN base station connect (1).At this moment, connect acknowledge message (2) from WLAN NIC driver to the MIM input.When input connected acknowledge message, MIM judged whether use WLAN is favourable.For example, judge according to priority as mentioned above.For example, under the situation of user's high-speed mobile, be judged as and continue to use honeycomb more favourable.Be judged as under the more favourable situation of use WLAN at MIM, connect acknowledge message (2 ') to the input of mobile IP v 6 module.

On the other hand, be judged to be continuation at MIM and use under the more favourable situation of honeycomb, do not carry out any processing.In this case, whether mobile IP is not in the identification of the state that can use WLAN, and proceeds cellular communication.Like this, can control upper layer, for example mobile IP by MIM.

Received the mobile IP v 6 module issue Router solicitation message that connects acknowledge message, sent (3) by WLAN NIC path.The WLAN base station in response sends Router advertisement message (4) in Routersolicitation message to mobile node.

The mobile IP v 6 module that receives Router advertisement message by WLAN NIC path is set WLAN base station 230 for default gateway (5).After having carried out this setting, the grouping that mobile node 240 sends is all sent to WLAN base station 230.

In addition, the mobile IP v 6 module generates the Care-of Address of WLAN NIC, makes the Binding update message that this Care-of Address of login is used, and this Binding update message is sent to home agent (6).It is the grouping of destination that mobile node 240 after login finishes receives with this node by WLAN base station 230 and WLAN NIC path.Like this, in different systems, for example the mobile node that moves between honeycomb and WLAN can move between system under its situation of communicating by letter can not interrupting.That is, can switched system and can not produce the instantaneous interruption of communication.

The work of the mobile node of present embodiment then, is described with reference to Figure 16 and Figure 17.

Mobile node has judged whether new discovery NIC (step S1602).

In new discovery under the situation of NIC (step S1602: be), MIM judges that whether the priority of newfound NIC is than current Active NIC height (step S1604).

Under the high situation of the current Active NIC of the priority ratio of newfound NIC (step S1604: be), MIM Active NIC as Receive NIC, newfound NIC as Active NIC (step S1606).

(step S1604: not), return step S1602 under the priority of situation that does not have new discovery NIC (step S1602: deny) and the newfound NIC situation high unlike current Active NIC.

Then, the U.VIF that the Active NIC that is had with MIM is corresponding linkup.notification as connecting the mobile IP v 6 module (step S1608) that acknowledge message inputs to upper layer.

Then, mobile IP v 6 module issue Router solicitation message sends to WLAN base station (step S1702) by WLAN NIC path.

The WLAN base station in response sends Router advertisement message (step S1704) in Router solicitation message to mobile node.

When mobile node receives Router advertisement message, in the mobile IP v 6 module, be the WLAN base station sets default gateway (step S1706).Like this, after having carried out this setting, the grouping that mobile node sends is all sent to the WLAN base station.

Then, the mobile IP v 6 module generates the Care-of Address of WLAN, makes the Binding update message that this Care-of Address of login is used, and sends to home agent (step S1708).Like this, after having logined Care-of Address, it is the grouping of destination that mobile node receives with this node by WLAN base station and WLAN NIC path.

According to present embodiment, in the control of IPv6 mobility, by obtaining the router that interface connected that arrive to confirm recently as default gateway, can know the interface that grouping is used in sending, and can be using as transmission interface at the highest interface of this moment availability.And, in IP-based mobile radio communication, the loss in the time of can reducing mobile node and switch.

In the above-described embodiments, the mobile node with MIM has been described, but under the situation that does not have MIM, also can between system, have moved and not interrupt communication halfway.In this case, when having found new NIC, driver connects acknowledge message to upper layer input, afterwards, carries out the illustrated processing with reference to Figure 17.

In addition, the situation that mobile node moves has been described between honeycomb and WLAN, also has been applicable to situation about between other system, moving certainly.

The control method of mobile node of the present invention and mobile node and mobile node controlling procedural application are in the mobile node with a plurality of interfaces.

Claims (13)

1. mobile node with a plurality of interfaces is characterized in that having:

Generation unit, it generates control information at each described interface;

Information provides the unit, and the described control information that its each described interface provides offers upper layer; And

The path control unit, it is according at least one in described control information execution connectivity affirmation and the routing update.

2. mobile node according to claim 1 is characterized in that having:

Information exchange unit, itself and each described interface exchange described control information;

Extract the unit out, it extracts the attribute information of described interface out from described control information;

Memory cell, it stores described attribute information; And

Selected cell, it selects to have in the described interface interface of the attribute that satisfies predetermined condition.

3. according to any described mobile node in claim 1 and 2, it is characterized in that,

Described generation unit generates described control information according to the communications status that is provided by upper layer in the protocol stack of described mobile node and at least one side in the lower layer.

4. according to any described mobile node in the claim 1 to 3, it is characterized in that,

Described selected cell comes option interface according to the Preference of the connection priority that has defined described interface.

5. according to any described mobile node in the claim 1 to 4, it is characterized in that,

Described selected cell is indicated the interface closing function beyond the selected interface.

6. according to any described mobile node in the claim 1 to 5, it is characterized in that,

Described selected cell can receive the interface in the work at present when having selected different with the interface in the work at present new interface, and the interface of new selection can be sent and receive.

7. according to any described mobile node in the claim 1 to 6, it is characterized in that,

Described generation unit generates described control information with the gap periods ground of regulation.

8. according to any described mobile node in the claim 1 to 7, it is characterized in that,

Described selected cell comes option interface according to the priority of described interface.

9. according to any described mobile node in the claim 1 to 8, it is characterized in that,

Described selected cell comes option interface according to the packet that receives by described interface.

10. according to any described mobile node in the claim 1 to 9, it is characterized in that,

Described path control unit switches to connection status by the interface in the use, carries out at least one in connectivity affirmation and the routing update.

11. the control method with mobile node of 2 or more interfaces is characterized in that, comprises the steps:

Generate control information at each described interface;

The described control information that reception is provided by described interface;

Described control information is offered upper layer; And

According at least one in described control information execution connectivity affirmation and the routing update.

12. the control method of mobile node according to claim 11 is characterized in that, also comprises the steps:

Exchange described control information with each described interface;

From described control information, extract the attribute information of described interface out;

Store described control information;

Select to have in the described interface interface of the attribute that satisfies predetermined condition; And

Switch to selected interface.

13. the control program with mobile node of 2 or more interfaces is characterized in that following processing:

Make described mobile node as generation unit, generate control information at each described interface;

Make described mobile node unit in return, exchange described control information with each described interface;

Make described mobile node as extracting the unit out, extract the attribute information of described interface according to described control information out;

Make described mobile node as memory cell, store described attribute information;

Make described mobile node as selected cell, select to have in the described interface interface of the attribute that conforms to a predetermined condition; And

Make described mobile node provide the unit as information, the control information that each described interface is provided offers upper layer.

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