CN1846360A - System and method for providing handover of a mobile ip terminal in a wireless network - Google Patents
System and method for providing handover of a mobile ip terminal in a wireless network Download PDFInfo
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- CN1846360A CN1846360A CNA2004800249502A CN200480024950A CN1846360A CN 1846360 A CN1846360 A CN 1846360A CN A2004800249502 A CNA2004800249502 A CN A2004800249502A CN 200480024950 A CN200480024950 A CN 200480024950A CN 1846360 A CN1846360 A CN 1846360A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/12—Reselecting a serving backbone network switching or routing node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/34—Modification of an existing route
- H04W40/36—Modification of an existing route due to handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Abstract
Disclosed is a system for providing handover of a mobile node in a wireless network supporting Mobile IP. The mobile node sends, when handover is needed, a request for neighbor access router information to a first access router currently communicating with the mobile node, and selects, if the neighbor access router information is received, a second access router serving as a target access router using the received neighbor access router information. The first access router exchanges access router information with a neighbor access router, provides neighbor access router information to the mobile node upon receiving the neighbor access router information request from the mobile node, and redirects data to be delivered to the mobile node to the second access router to which the mobile node will be handed over. The second access router forwards data to be delivered to the mobile node to the corresponding mobile node.
Description
Technical field
The present invention relates generally to the ambulant system and method for the terminal that is used for support adopting mobile IP (Internet Protocol) wireless system, relates in particular to the system and method for the switching that is used to provide mobile IP terminal in wireless network.
Background technology
Wireless system is categorized as mobile communication system, wireless local loop (WLL) system and WLAN (wireless local area network) (WLAN) system that wherein uses mobile phone or personal cellular system (PCS) phone usually.These wireless systems have been developed as independently system.Yet, at present, the integrated Internet Protocol of wireless system (IP).In the method for the use IP integrated system that suggestion comes, system uses mobile IP communication.Terminal is used in the system of mobile IP communication therein, and terminal will be called couple in router (AR) by the target that wireless channel communicates.Wireless LAN system is the most typical example that wherein uses the system of couple in router.
To the Wireless LAN system that use mobile IP be described.Basically, because Wireless LAN system uses wireless channel to communicate by letter with couple in router, as long as system passes through a couple in router communication, system just can guarantee the mobility of support terminal.The ambulant complete mobility of guaranteeing to guarantee fully terminal of this part.That is, terminal moves to new couple in router when may communicate by letter in the coverage of current couple in router.In this case, identical with mobile communication system, Wireless LAN system must provide the switching of terminal so that guarantee mobility.That is, Wireless LAN system should be also position by the office terminal be provided at seamless communication between transfer period.In order to provide even seamless communication between transfer period, use mobile IP technology.According to employed version, mobile IP technology is categorized as mobile IPv 4 and mobile IP v 6.In the following description, no matter employed version uses the terminal of mobile IP all will be called " mobile node (MN) ".
Mobile IPv 4 definition local agent (HA) and external agent (FA) are so that provide the mobility of mobile node.In addition, mobile IPv 4 is carried out the location management of mobile node by HA and FA.HA is arranged in the local network of mobile node, and FA is arranged in the objective network that mobile node will switch.Each mobile node is carried out when switching, its its current location of notice HA.HA stores the positional information of mobile node then, and when data will be sent to mobile node, HA encapsulated corresponding data, and encapsulation of data is sent to FA by the tunnel.FA is sent to the mobile node that is arranged in its network from HA reception encapsulation of data and with the data that received then.
As mentioned above, the data that are sent to mobile node make and do not optimize data transfer path always by HA.In order to address this problem, path optimization (RO) technology has been proposed.Simultaneously, having proposed the mobile IP v 6 technology utilizes the advantage of IPv6 technology and supports mobile node in the IPv6 network.In the IPv6 technology, owing to use path optimization's technology that data are sent to mobile node basically, mobile node becomes the terminal point and the data of deblocking through encapsulating in tunnel.
Provide changing method among layer 3 (L3) of mobile IP in 7 layers of OSI.Yet the changing method in layer 2 (L2) is not discussed, in L3, carried out before the communication that causes by switching the communication in should complete layer 2.In addition, between the transfer period of mobile node, long delay takes place, so mobile node is difficult to carry out seamless communication.In order to address this problem, fast moving IP and hierarchical mobile IP have been proposed.These technology are better than simple mobile IP on reducing aspect the time-delay that occurs between transfer period.Yet, identical with mobile IP, the also management switching in L3 of these technology.That is, do not consider that in these technology L2 switches.In other words, do not have to propose to be used to optimize L2 switches and based on the L2 handover optimization L2 and L3 between transfer period L2 switch and the appropriate method of the correlation of L3 between switching.
To be described in the time-delay that takes place in the L2 hand-off process now.Characteristic by following wireless network causes the time-delay that takes place in the L3 hand-off process.
Though they use identical medium, adjacent wireless network uses different channels and disturbs so that prevent.Therefore, in order to carry out switching, mobile node should obtain medium information and it is with the channel information that uses in the target radio network that switches.In order to obtain these information, the L2 of mobile node should check the information about All Media and channel available in the wireless network.Acquisition is called " scan channel " about the information processing of All Media available in the wireless network and channel.After carrying out the scan channel processing, best medium and channel that the mobile node selection is used to switch.Behind definite best medium and channel, mobile node is selected the couple in router (AR) corresponding to determined medium and channel, carries out the L2 hand-off process then.
Fig. 1 is the figure of diagram couple in router via the routing to communicate of IP network and mobile node.In Fig. 1, internet network 131 is IPv4 or IPv6 network.Internet network 131 is connected to first and second router ones 21 and 122.First and second router ones 21 and 122 are connected to a plurality of couple in routers 111,112,113 and 114.In Fig. 1, for example, the first router 121 is connected to first and second couple in routers 111 and 112, and the second router 122 is connected to third and fourth couple in router 113 and 114.
Suppose that first couple in router 111 has IEEE 802.11a network channel, second couple in router 112 has IEEE 802.11b network channel, the 3rd couple in router 113 has IEEE 802.11a/b network channel, and the 4th couple in router 114 has IEEE 802.11g network channel.Mobile node 101 at first is connected to first couple in router 111, and by wireless channel communication.When mobile node was positioned at the coverage of first couple in router 111, it was represented by Reference numeral 101a.When mobile node was positioned at the coverage of second couple in router 112, it was represented by Reference numeral 101b.When mobile node was positioned at the coverage of the 3rd couple in router 113, it was represented by Reference numeral 101c.
By this way, mobile node changes the couple in router that it is communicated by letter with it when it moves.When mobile node remains in the coverage of specific couple in router, do not exist and switch the problem that causes.Yet when mobile node moved to new couple in router, mobile node should be carried out switching, the problem that causes occurred switching.
For example, in some cases, mobile node can with change the network coverage when first couple in router 111 in the network's coverage area (the current region of mobile node) of first couple in router 111 is communicated by letter.That is, as shown in arrow 10, mobile node 101a can move to the network's coverage area of second couple in router 112.When causing couple in router when first couple in router 111 is changed into second couple in router 112 because the network's coverage area of mobile node changes, first and second couple in routers 111 can use different communication standards with 112.For example, second couple in router 112 uses IEEE 802.11b standard if first couple in router 111 uses IEEE 802.11a standard, so because they use different access technologies can produce following point.
At first, because mobile node 101a does not know the communication standard and the channel that use in the adjacent networks, mobile node 101a should detect communication standard and the channel that uses in the adjacent networks.For the channel of the communication standard that detects use, all channels that define in the IEEE 802.11a standard that mobile node scanning is used in the network of its current connection.Yet in the adjacent networks that uses IEEE 802.11b standard, mobile node can not acquired information.Then mobile node use except that IEEE 802.11a standard, its spendable access standard comes scanning channel once more.If mobile node can use all IEEE 802.11a standards, IEEE 802.11b standard and IEEE 802.11g standard, then its select IEEE 802.11b standard and IEEE 802.11g standard in the lump by the selected communication standard channel of scanning neighbor network once more.If select IEEE 802.11b standard, mobile node can detect the channel that uses in adjacent networks.Yet if select IEEE 802.11g standard, mobile node should use all signals of IEEE 802.11g standard scan, uses all channels of IEEE 802.11b standard scan adjacent networks then.
Summary of the invention
When mobile node has negative effect according to the time-delay that all possible standard produces during all channels of scanning neighbor network one by one to communication, not only mobile IP but also switch fast and hierarchical mobile IP also has latency issue.In addition, when mobile node used portable power supplies such as battery, long channel reduced the running time of battery sweep time.In addition, the time-delay of carrying out in switching may cause that service quality (QoS) reduces.
Therefore the purpose of this invention is to provide a kind of mobile node that is used for reducing wireless network and carry out the system and method for the time-delay of switching.
Another object of the present invention provides the system and method for the power consumption between a kind of transfer period of the mobile node that is used for reducing wireless network.
Another object of the present invention provides the system and method that QoS reduces between a kind of transfer period of the mobile node that is used for preventing wireless network.
For obtaining above-mentioned and other purpose, provide a kind of system that is used for providing the switching of mobile node at the wireless network of supporting mobile IP.When needs switch, mobile node is to the request of current first couple in router transmission of communicating by letter with mobile node to adjacent access router information, if and reception adjacent access router information, then use the adjacent access router information that is received, select second couple in router as the target couple in router.First couple in router and adjacent access router exchange information of access route, in case receive the adjacent access router information request from mobile node, then provide adjacent access router information, and will be sent to second couple in router that the data redirection of mobile node will switch to mobile node to mobile node.Second couple in router will send to corresponding mobile node from first couple in router data that receive, that will be sent to mobile node.
In order to obtain top and other purpose, provide a kind of method that is used for providing the switching of mobile node at the wireless network of supporting mobile IP.This method comprises and adjacent access router exchange information of access route; Switch if desired, mobile node is to the request of current first couple in router transmission of communicating by letter with mobile node to adjacent access router information; In case receive the adjacent access router information request from mobile node, then provide adjacent access router information to mobile node by first couple in router, in case receive adjacent access router information, second couple in router that mobile node will switch to according to adjacent access router Information Selection mobile node; Transmission is used for making first couple in router with previous Care-of Address (CoA) that obtains from first couple in router and the binding update messages that will bind at the new CoA that second couple in router uses; With in case receive binding update messages, the data redirection that will be sent to mobile node by first couple in router makes second couple in router that data are sent to mobile node to second couple in router.
Description of drawings
In conjunction with the drawings the preferred embodiments of the present invention are described in detail, above-mentioned purpose of the present invention and advantage will become apparent, wherein:
Fig. 1 is the figure of diagram couple in router via the router communication of IP network and mobile node;
Fig. 2 be diagram according to an embodiment of the invention, use the figure of couple in router of the route of IP network and mobile node;
To be diagram carry out the flow chart of the operation of carrying out when switching according to the embodiment of the invention, when mobile node to Fig. 3 in each couple in router;
Fig. 4 is the adjacent networks information processing is upgraded in diagram by couple in router according to the embodiment of the invention, in wireless network a flow chart;
Fig. 5 is diagram receives the processing of the network information from adjacent access router according to the embodiment of the invention, by couple in router a flow chart;
Fig. 6 is hand-off process is carried out in diagram according to the mobile node in the embodiment of the invention, the network a flow chart;
Fig. 7 is the quick hand-off process of prediction is carried out in diagram according to the mobile node of the use ARIP grouping of the embodiment of the invention a signaling diagram;
Fig. 8 is that diagram is carried out the signaling diagram of the quick hand-off process of reaction according to the mobile node of the embodiment of the invention, use ARIP grouping;
Fig. 9 be diagram according to another embodiment of the present invention, use the mobile node of ARIP grouping to carry out the signaling diagram of quick hand-off process.
Embodiment
Describe several preferred embodiments of the present invention in detail with reference to appended accompanying drawing.In the following description, for the sake of simplicity, the known function of combination here and the detailed description of configuration have been omitted.
In order to address the above problem, the invention provides a kind of method, wherein couple in router is adjacent mutually geographically, the medium information and the channel information that use in their wireless network of periodical exchange, and information is provided to mobile node.Use this method, mobile node only needs to scan predetermined medium and channel, and does not need to scan All Media and channel, finishes switching thus fast.That is, the present invention proposes to reduce switching time, reduces power consumption and prevents the agreement that QoS reduces.In the present invention, be used for that the agreement of exchange message is the agreement that is in application layer between couple in router.
With reference to Fig. 2, will the method that be used for the information that transmits according to an embodiment of the invention between the wireless network couple in router be described.Fig. 2 is the figure of the couple in router of the diagram route of using IP network and mobile node according to an embodiment of the invention.Fig. 2 structurally is equivalent to Fig. 1.
Therefore, first couple in router 211 has IEEE 802.11a network channel, second couple in router 212 has IEEE 802.11b network channel, and the 3rd couple in router 213 has IEEE 802.11a/b network channel, and the 4th couple in router 214 has IEEE 802.11g network channel.Mobile node 201 at first is connected to first couple in router 211, and by wireless channel communication.When mobile node 201 was arranged in the overlay area of first couple in router 211, it was represented by Reference numeral 201a.When mobile node 201 was arranged in the overlay area of second couple in router 212, it was represented by Reference numeral 201b.When mobile node 201 was arranged in the overlay area of the 3rd couple in router 213, it was represented by Reference numeral 201c.
In this configuration, first couple in router 211 is sent to second couple in router 212 with channel information via its first router that is connected 221 with its standard.In addition, second couple in router 212 is sent to first couple in router 211 with channel information via its first router that is connected 221 with its standard.By Reference numeral 202 these transfer paths of expression.Second couple in router 212 is sent to internet network 231 with data via the first router 221 that is connected with second couple in router 212 with the 3rd couple in router 213.Then, second couple in router 212 is sent to the 3rd couple in router 213 with its standard and channel information by the second router 222 that is connected to the 3rd couple in router 213.By Reference numeral 203 these transfer paths of expression.This standard and channel information can comprise standard information, channel information, QoS information and security information.Term used herein " information ", " standard information and channel information " and " standard and channel information " all be used to represent above-mentioned information, and standard and channel information can also comprise the out of Memory that needs in the network and be used to switch required out of Memory.Be known in the art owing to switch required information in the network, do not providing its detailed description here.
On the contrary, the 3rd couple in router 213 and second couple in router 212 are sent to internet network 231 via the second router 212 that is connected to the 3rd couple in router 213 with data.Then, the 3rd couple in router 213 is sent to second couple in router 212 with its standard and channel information by the first router 221 that is connected to second couple in router 212.By Reference numeral 204 these transfer paths of expression.In addition, provide in an identical manner by Reference numeral 205 and 206 the expression paths transmit data.
In order to carry out aforesaid operations, each couple in router should be able to be sent to its information adjacent with it geographically adjacent access router.In addition, each couple in router need be about the information of its adjacent access router.Wherein specific couple in router is determined to be divided into following two methods about the new method of the information of its adjacent access router.
In first method, the keeper of supervising the network clearly defines the couple in router adjacent with each couple in router.This is the simplest method, and if network configuration not change be effective all just.Yet in the method, the keeper wants the adjacent access router of each couple in router of individual's definition.In addition, if add or the change couple in router, the keeper should redefine adjacent access router.
In second method, each couple in router can be by the automatic information that obtains about its couple in router of mobile node.
In the method, because mobile node will be provided to the couple in router in the current network about the information of previous couple in router when carry out switching, couple in router uses this information can obtain information about its adjacent access router.Use this method, each couple in router can obtain the information about couple in router (even new couple in router that adds) automatically.
What Fig. 3 was diagram according to the embodiment of the invention carries out when switching the flow chart of the operation of carrying out when mobile node in each couple in router.With reference to Fig. 3, will describe wherein between couple in router after the exchange message, mobile node switches to the disposed of in its entirety of new couple in router from specific couple in router.When describing processing, suppose that mobile node 201a moves to second couple in router 212 from first couple in router 211.
Because first couple in router 211 is adjacent mutually with second couple in router 212, supposes to have exchanged standard and channel information between access router.Describe information exchange between the couple in router in detail with reference to Fig. 4.Suppose to have carried out information exchange between the couple in router in the step 300 of Fig. 3.When beginning carry out to handle, after specific mobile node receives handoff request, couple in router can discern that they are adjacent mutually.In most of the cases, after this incident usually occurs in and has carried out information exchange.Therefore, suppose the processing of execution in step 300.First couple in router 211 and second couple in router 212 have been known about the ieee standard of there use and the information of channel.
When specific mobile node 201 when arrow 10 moves to second couple in router 212, mobile node 201a sends a handover request to first couple in router 211.At this moment, mobile node 201a sends request to the information of the target couple in router that will switch to about it to first couple in router 211.If first couple in router 211 receives such handoff request, that is, if determine to receive handoff request from specific mobile node in step 310, then first couple in router 211 advances to step 320.In step 320, first couple in router 211 is transmitted in standard and the channel information that uses in second couple in router 212 (the target couple in router of mobile node 201a request) to mobile node 201a.Then, in step 330, first couple in router 211 is carried out the release of the channel that is established to mobile node 201a and is handled, and interrupt communication.Even in mobile node 201a, carry out this and handle, and mobile node 201a is discharged into the channel of first couple in router 211, and be established to the channel of second couple in router 212, and carry out thus and switch.By this way, mobile node 201a becomes the mobile node 201b that is arranged in second couple in router 212.
Fig. 4 be diagram according to the embodiment of the invention in wireless network, upgrade adjacent networks information by the couple in router cycle, promptly about the flow chart of the information processing of adjacent access router.Term used herein " network information " refers to the information about couple in router.With reference to Fig. 4, in wireless network, upgrade the adjacent networks information processing according to the embodiment of the invention by couple in router with describing in detail.Suppose processing by first couple in router, 211 execution graphs 4 of Fig. 2.
In step 400, first couple in router 211 keeps idle condition.The idle condition of using in Fig. 4 refers to the wherein state of first couple in router, 211 undos, and perhaps first couple in router 211 is not carried out the state about operation of the present invention.
In idle condition, first couple in router 211 determines whether to arrive the update cycle in step 410.Suppose here that first couple in router 211 has the predetermined update cycle so as with its information of adjacent access router exchange.Update cycle can be set to, for example, and 30 seconds.If arrive the update cycle, first couple in router 211 advances to step 440.Yet if do not arrive the update cycle, first couple in router 211 advances to step 420.
In step 420, first couple in router 211 determines whether that its network configuration (or environment) changes.The change of network configuration or environment is corresponding to the standard in using or the change of channel.Change if determine network configuration, first couple in router 211 advances to step 430, otherwise first couple in router 211 turns back to step 400.In step 430, first network configuration information that couple in router 211 upgrades and storage is changed advances to step 440 then.In step 440, first couple in router 211 is sent to adjacent access router with network configuration information.As mentioned above, first couple in router 211 is sent to second couple in router 212 with the network information, or its adjacent access router.First couple in router 211 can be determined adjacent access router with the method for describing in conjunction with Fig. 3.
The method of exchange message can be divided into the method for periodical exchange information and the method that each network configuration change just is provided to information the couple in router in the adjacent networks between couple in router.Because these methods all have pluses and minuses, can select them according to network management strategy.
What Fig. 5 was diagram according to the embodiment of the invention receives the flow chart of the processing of the network information by couple in router from adjacent access router.With reference to Fig. 5, receive the processing of the network information according to the embodiment of the invention from adjacent access router by couple in router with describing in detail.Suppose processing by first couple in router, 211 execution graphs 5 of Fig. 2.
In step 500, first couple in router 211 keeps idle condition.The idle condition of using among Fig. 5 refers to the wherein state of first couple in router, 211 undos, and perhaps first couple in router 211 is not carried out the state about operation of the present invention.
In idle condition, first couple in router 211 determines whether to receive information from adjacent access router in step 510.If determine to receive the network information that comprises standard and channel information from adjacent access router in step 510, first couple in router 211 advances to step 520, the network information that it is relatively received in step 520 and the existing network information that is stored in adjacent access router wherein, corresponding.Then, in step 530, first couple in router 211 determines whether the network information that receives from adjacent access router is different with existing network information, that is, whether the network information changes.If the network information that is received changes, then first couple in router 211 advances to step 540, otherwise first couple in router 211 turns back to step 500.In step 540, first couple in router 211 upgrades and stores from the network information of the corresponding couple in router of adjacent access router reception.By this way, if the network information that receives from adjacent access router changes, then first couple in router 211 can upgrade and keep adjacent networks information continuously.
Fig. 6 is hand-off process is carried out in diagram according to the mobile node in the network of the embodiment of the invention a flow chart.With reference to Fig. 6, carry out hand-off process with describing in detail according to the mobile node in the network of the embodiment of the invention.In this was handled, as shown in Figure 2, the mobile node 201a that supposes to be arranged in the overlay area of first couple in router moved to the overlay area of second couple in router 212.
In step 600, mobile node 201a carries out enable mode or idle pulley.Here " enable mode " of Shi Yonging refers to the state that mobile node 201a wherein communicates by letter with first couple in router 211 or current couple in router, and " idle pulley " used herein refers to the state that mobile node 201a does not wherein communicate by letter with any couple in router.In this state, mobile node 201a need to determine whether to switch in step 602.If need to determine to switch in step 602, mobile node 201a advances to step 604.Level by the signal that relatively receives from current couple in router need to determine whether to switch with the level of the signal that receives from new couple in router.
In step 604, mobile node 201a sends the adjacent networks information request to first couple in router 211 of communication with it.In step 606, mobile node 201a receives adjacent networks information in response to the adjacent networks information request from first couple in router 211.The adjacent networks information that is received can be about the information of a plurality of couple in routers rather than about the information of single couple in router.This can understand from the neighbor cell of cellular system.After receiving adjacent networks information from first couple in router 211, mobile node 201a advances to step 608, and it determines the priority of medium and channel in step 608.In this case, mobile node 201a at first determines specific medium, sets up the channel that is used for medium then.Suppose from the information of first couple in router, 211 receptions, and 3 adjacent access routers comprise two adjacent access router and adjacent access routers with IEEE 802.11g network environment with IEEE 802.11a network environment about 3 adjacent access routers.Mobile node 201a can obtain the channel about the adjacent access router use, that is, acquisition has the channel information of two adjacent access routers channel information that uses and an adjacent access router use with IEEE 802.11g network environment of IEEE 802.11a network environment.Therefore, use and determine specific criteria, scan the method for respective channels then, even do not scan the couple in router that all channels also can determine to carry out switching.
Here will not provide the detailed description of the method for determining priority.After determining priority, mobile node 201a advances to step 610, and it is according to the priority scanning channel in step 610.During each mobile node 201a scanning particular channel, mobile node 201a determines whether that in step 612 it has searched for it with the objective network that switches to.If determine to have searched for objective network in step 612, mobile node 201a advances to step 614.Yet if when step 612 determines not have the ferret out network, mobile node 201a turns back to step 610, and it changes channel and standard according to next priority in step 610, and carries out new scanning according to channel that changes and standard.
After finishing the search of mobile node 201a with the specific objective network that switches to, mobile node 201a carries out L2 and switches.Then, mobile node 201a is in its more high-rise execution hand-off process.After finishing hand-off process, that is, as shown in Figure 2, move to the coverage of second couple in router 212 at mobile node 201a after, mobile node 201a turns back to step 600, its carries out enable mode or idle pulley in step 600.
To with reference to Fig. 2 the hand-off process that mobile node is carried out be described once more here.When mobile node 201a moves to second couple in router 212 from first couple in router 211, mobile node 201a uses the signal level that receives from current network to determine to carry out switching.Then, first couple in router 211 of mobile node 201a in current network sends the request about the information of adjacent wireless network.Use this information, mobile node 201a can obtain following information.At first, mobile node 201a can determine following information.At first mobile node 201a can determine the management domain at its place, and the jumping between definite adjacent access router (hop) distance.In addition, mobile node 201a can obtain to be used for to indicate the information of the available function of couple in router.Use this information, mobile node 201a can obtain the information about adjacent wireless network, and the best couple in router of selecting to communicate by letter with mobile node from adjacent access router is carried out switching.
Yet current mobile IP technology is not provided for allowing mobile node to select the technology of best couple in router.Therefore, the present invention proposes a kind of effectively method of switching of information of access route agreement (ARIP) grouping execution that is used to use.Even switching also can be used the ARIP grouping that proposes in the present invention between heterogeneous networks.Use the ARIP grouping to carry out the method for switching with describing.
As mentioned above, switch to wireless network in order to carry out, current mobile node should scan all channels of each wireless network.By this way, mobile node can be selected the best couple in router of communicating by letter with mobile node, and after selecting best couple in router, mobile node begins L2 and switches.When use was divided into groups according to ARIP of the present invention, mobile node can obtain the information about adjacent wireless network.Mobile node is allowed to only scan the channel that uses in adjacent networks, reduce thus and switch the required time.
The ARIP grouping has the form shown in the table 1
Table 1
| MAC prefix (14 byte) |
| IPv6 prefix (20 byte) |
| UDP prefix (8 byte) |
| ARIP information (64 bytes+option) |
Table 2 diagram is positioned at the information type and the form of ARIP information field at the end of ARIP grouping
Table 2
| The address of couple in router | |||
| Medium information | Channel information | QoS information | Mark |
| Authentication information | |||
| Address prefix | |||
| Option | |||
Each field of using in table 2 has following length.' address of couple in router ' field has 128, ' medium information ' field has 32, ' channel information ' field has 32, ' QoS ' field has 32, ' mark ' field has 32, ' authentication information ' has 128, and ' address prefix ' has 128, and ' option ' field has variable-size.
Be included in according to information in the ARIP grouping of the present invention, that between couple in router, exchange as follows.For the L2 that reduces mobile node switches required time-delay, the ARIP grouping transmits L2 information.For example, according to the medium that uses in wireless network, the ARIP grouping comprises different information, and when using IEEE 802.11, the ARIP grouping comprises extended service set ID (ESSID) and channel information.In table 2, ' couple in router address ' field is represented the address of couple in router, and ' medium information ' and ' channel information ' field channel of indicating the wireless access medium that uses respectively and will use.' mark ' field represents to be used in reference to the information whether current couple in router that shows the corresponding grouping of transmission supports switching fast and paging.The information of the discriminating of the QoS information that provides in the corresponding couple in router and use is provided for ' QoS information ' and ' authentication information ' field.The prefix of the address of using in the network that ' address prefix ' field is represented to be managed by current couple in router.At last, when the needs extraneous information, use ' option ' field that information is provided.
For example, when using 802.11 WLAN, transmit the information such as ESSID.In addition, can comprise L3 information and switch required time-delay so that reduce L3.The application message that can also comprise in addition, the switching that is used to support mobile node.
Fig. 7 is the quick hand-off process of prediction is carried out in diagram according to the mobile node of the use ARIP grouping of the embodiment of the invention a signaling diagram.With reference to Fig. 7, when use is carried out the quick switching of prediction according to the ARIP grouping of the embodiment of the invention, with signaling process and the operation of describing in detail between mobile node and the couple in router.
In Fig. 7, mobile node (MN) 201 is corresponding to the previous couple in router (PAR) of mobile node shown in Figure 2 201, the first couple in routers, 211 conducts, and second couple in router 212 is as new couple in router (NAR) (becoming switching target).
In step 700, mobile node 201 receives data from first couple in router 211.To the switching of carrying out be described when mobile node receives data by this way.In step 702, use ARIP grouping, exchange network information between first couple in router 211 and second couple in router 212 or adjacent access router according to the embodiment of the invention.
In this state, there is the situation that the preceding triggering of L2 (pre-L2 trigger) when mobile node 201 is communicated by letter with first couple in router 211, occurs.Appearance L2 triggers and asks L2 to switch.That is, because low, trigger the upper strata mobile node of notifying mobile node and should carry out and new communicating by letter of couple in router so L2 occurs from the signal level of first couple in router 211.In step 706, mobile node 201 sends the adjacent networks information request by the ARIP grouping that sends according to the embodiment of the invention to first couple in router 211, so that obtain adjacent networks information.Can mobile node 201 enter particular network coverage the moment and L2 takes place for actual any time of switching between the moment that produces L2 and trigger (wherein switch indication and be sent to L3 from L2) before trigger, and this is definite according to network management strategy.
In case receive the adjacent networks information request, first couple in router 211 will be sent to mobile node 201 about the information of first couple in router and adjacent access router thereof in step 708.Then, mobile node 201 produces L2 in step 710 and triggers, and advances to step 712 then, and it sends to first couple in router 211 and is used to ask router solicitation agency (RtSolPr) message of the information of switching fast in step 712.In step 714, first couple in router 211 uses agent router notice (PrRtAdv) message to transmit its information of access route to mobile node 201.
Then, mobile node 201 produces the new Care-of Address (NCoA) of expection.In step 716, mobile node 201 transmits quick Binding Update (FBU) message that comprises the expection NCoA that is produced to first couple in router 211.FBU message is the message that mobile node 201 uses, be used to notify first couple in router 211 it business should be redirected to second couple in router 212.Therefore, FBU message make first couple in router 211 with previous CoA (PCoA) or in first couple in router 211 as previous couple in router in available CoA and second couple in router 212 as new couple in router available CoA bind.This is to be transferred to second couple in router 212 for the change according to the position of mobile node 201 via the grouping tunnel that first couple in router 211 will be sent to mobile node 201.
In step 718, first couple in router 211 that receives FBU message from mobile node 201 will switch second couple in router 212 that startup (HI) message is sent to the new couple in router of conduct.Start switching from first couple in router 211 to second couple in router 212 or new couple in router transmission HI message.In step 720, in response to the HI message that receives from first couple in router 211, second couple in router 212 transmits switching affirmation (HACK) message to first couple in router 211 or previous couple in router.Whether the NCoA that verifies expection is handled in the exchange of execution HI message and HACK message available.
In step 722a and 722b, first couple in router 211 that receives HACK message is sent to the mobile node 201 and second couple in router 212 with quick binding acknowledgement (FBACK) message.From this moment, when mobile node 201 inserted second couple in routers 212 or new couple in router, it should use available NCoA, was wherein carried by HI message and verified this NCoA by new couple in router, perhaps distributed NCoA by new couple in router.Therefore, in step 724, mobile node 201 disconnects the channel that is connected to first couple in router 211.
In step 726, first couple in router 211 will be sent to the data forwarding of mobile node to second couple in router 212 or new couple in router.In step 728, mobile node 201 is determined priority and scanning channel according to the adjacent networks information of describing in conjunction with Fig. 6 that receives.Mobile node 201 uses according to the information in the ARIP grouping in the search adjacent networks of the present invention, and only the channel of scanning finite quantity switches.Behind channel search, mobile node 201 is prepared to connect in step 730.
In step 732, mobile node 201 is sent to second couple in router 212 or new couple in router with quick neighbor notification (FNA) message.The message (FNA) that is sent to second couple in router from mobile node is used to notify after receiving FBACK message mobile node 201 to determine NCoA and inserted new couple in router.In step 734, receive data forwarding that second couple in router 212 of FNA message will receive from first couple in router 211 to mobile node 201.
Fig. 8 is that diagram is carried out the signaling diagram that the quick switching of reaction (Reactive Fast Handoff) is handled according to the mobile node of the use ARIP grouping of the embodiment of the invention.With reference to Fig. 8 in detail, signaling process between mobile node and the couple in router and operation will be described when use is reacted switching fast according to the ARIP grouping execution of the embodiment of the invention.
In Fig. 8, mobile node (MN) 201 is corresponding to the previous couple in router (PAR) of mobile node shown in Figure 2 201, the first couple in routers, 211 conducts, and the new couple in router (NAR) of second couple in router, 212 conducts, and as switching target.
In step 800, mobile node 201 receives data from first couple in router 211.To the switching of carrying out be described when mobile node 201 receives data by this way.In step 802, use ARIP grouping, exchange network information between first couple in router 211 and second couple in router 212 or adjacent access router according to the embodiment of the invention.
In this state, there is the situation that the preceding triggering of L2 when mobile node 201 is communicated by letter with first couple in router 211, occurs.Appearance L2 triggers and asks L2 to switch.That is, since low from the signal level of first couple in router 211, should communicate by letter with new couple in router so upper strata 3 mobile nodes of L2 triggering cause layer 2 notice mobile node occur.In step 806, mobile node 201 comes to send the adjacent networks information request to first couple in router 211 by the ARIP grouping that sends according to the embodiment of the invention, so that obtain adjacent networks information.Can mobile node 201 enter particular network coverage the moment and L2 takes place for actual any time of switching between the moment that produces L2 and trigger (wherein switch indication and be sent to L3 from L2) before trigger, and this is definite according to network management strategy.
In case receive the adjacent networks information request from mobile node 201, first couple in router 211 will be sent to mobile node 201 about the information of first couple in router 211 and adjacent access router thereof in step 808.Then, mobile node 201 produces L2 in step 810 and triggers, and advances to step 812 then, and it sends to first couple in router 211 and is used to ask router solicitation agency (RtSolPr) message of the information of switching fast in step 812.In step 814, first couple in router 211 uses agent router notice (PrRtAdv) message to transmit its information of access route to mobile node 201.
Then, in step 816, mobile node 201 disconnects the channel that is connected to first couple in router 211.In step 818, mobile node 201 use among the ARIP information only the channel of scanning finite quantity search for adjacent networks and switch.If mobile node 201 does not receive FBACK message from first couple in router 211 or previous couple in router, if for example mobile node 201 does not send FBU message, perhaps it leaves first couple in router 211 before receiving FBACK message after sending FBU message, then mobile node 201 advances to step 822, it uses quick neighbor notification (FNA) message to encapsulate FBU message in step 822, and FBU message is sent to second couple in router 212 or new couple in router.In the processing of step 822, whether 212 checking NCoA are available for second couple in router.If NCoA in use, second couple in router 212 is discarded in the FBU message that comprises in the FNA message, neighbor notification is set confirms (NAACK) option, and use router advertisement message to send NCoA.The FNA message that is sent to second couple in router 212 from mobile node 201 is used to notify the definite new NCoA of mobile node 201 and inserts second couple in router 212.
Then, mobile node 201 inserts second couple in router 212 and FBU message is sent to first couple in router 211.FBU message be mobile node 201 make be used for notifying first couple in router 211 it should be sent to the data redirection of mobile node 201 to second couple in router 212.Therefore, FBU message makes first couple in router 211 with available new CoA (NCoA) binding in the previous CoA (PCoA) of first couple in router 211 or previous couple in router and second couple in router 212 as new couple in router, makes the position of dividing into groups to be tunnelled to mobile node 201 places.
Then, first couple in router 211 is sent to second couple in router 212 in response to FBU message with FBACK message.Therefore, first couple in router 211 will be sent to the data forwarding of mobile node 201 to second couple in router 212.Then, second couple in router 212 will be sent to mobile node 201 from the data that first couple in router 211 receives.
So far, with reference to Fig. 7 and 8, described and be used to use ARIP grouping to carry out fast switching method.By using the ARIP according to the embodiment of the invention to be grouped in exchange network information between the couple in router, each couple in router is stored adjacent networks information in advance therein, has reduced switching time thus with when only using to compare when routine is quick to be switched.That is,, allow not scan all channels, but the channel of scanning finite quantity makes thus it can reduce the required time for the scan channel in L2.Mobile node 201 scan for networks is successively carried out switching.In this case, mobile node 201 uses above-mentioned information can define priority according to the state of mobile node 201.That is, for scan channel, mobile node 201 does not scan all channels, but the channel of scanning finite quantity is set up fast thus and switched.In addition, mobile node 201 can be carried out the switching of the network of its expectation.
Mobile node can carry out its expectation network be switching to the factor that can increase overall performance of network.For example, if mobile node and current couple in router are all supported quick switching, then mobile node is preferably carried out and is supported the switching of the network of switching fast.The information that use is included in the ARIP grouping can obtain this details.For identical reason, mobile node can also use QoS information.
Fig. 9 is that diagram uses the mobile node of ARIP grouping to carry out the signaling diagram of quick hand-off process according to another embodiment of the present invention.With reference to Fig. 9, will describe when using ARIP grouping execution switching according to another embodiment of the present invention signaling process between mobile node and the couple in router and operation in detail.
In Fig. 9, mobile node (MN) 201 is corresponding to the previous couple in router (PAR) of mobile node shown in Figure 2 201, the first couple in routers, 211 conducts, and the new couple in router (NAR) of second couple in router, 212 conducts, and as switching target.
In step 900, mobile node 201 receives data from first couple in router 211.To the switching of carrying out be described when mobile node 201 receives data by this way.In step 902, use ARIP grouping, exchange network information between first couple in router 211 and second couple in router 212 or adjacent access router according to the embodiment of the invention.
In this state, situation about step 904 existence L2 occurs when mobile node 201 is communicated by letter with first couple in router 211 before, triggering.Can mobile node 201 enter particular network coverage the moment and L2 takes place for actual any time of switching between the moment that produces L2 and trigger (wherein switch indication and be sent to L3 from L2) before triggering.Determine time of triggering before the L2 according to network management strategy.Then, in step 906, mobile node 201 comes to send the adjacent networks information request to first couple in router 211 by the ARIP grouping that sends according to the embodiment of the invention, so that obtain adjacent networks information.
In case receive the adjacent networks information request, first couple in router 211 will be sent to mobile node 201 about the information of first couple in router and adjacent access router thereof in step 908.Mobile node 201 is determined the wireless medium will use and the priority of channel according to its preference based on adjacent access router information between transfer period then.To method that determine priority according to preference be described here.After determining priority, mobile node 201 advances to step 910, and it sends the RtSolPr message that is used to ask the information switched to first couple in router 211 in step 910.
In step 912, first couple in router 211 uses agent router notice (PrRtAdv) message will be sent to mobile node 201 about the information of adjacent access router, and mobile node 201 receives the agent router notification message.Mobile node 201 produces new CoA that will use, expection in selected adjacent access router.In step 914, mobile node 201 produces to be prepared quick Binding Update (PFBU) message and PFBU message is sent to first couple in router 211, and this message comprises the expection NCoA that is produced.PFBU message be mobile node 201 make be used for notifying first couple in router 211 it should be sent to the message of the data redirection of mobile node 210 to second couple in router 212.
PFBU message make first couple in router 211 with previous CoA (PCoA) or in first couple in router 211 as previous couple in router in available CoA and second couple in router 212 as new couple in router available CoA bind.This grouping tunnel that will be sent to mobile node 201 is transferred to the reposition of mobile node 201.
The previous couple in router 211 that receives the PFBU that is used for couple in router from mobile node 201 sends switching startup (HI) message to second couple in router 212 or new couple in router.In an embodiment of the present invention, in step 916, first couple in router 211 that receives PFBU message is sent to second couple in router 212 or new couple in router with HI message.Start switching from first couple in router 211 to second couple in router 212 or new couple in router transmission HI message.
In response to the HI message that receives from first couple in router 211, second couple in router 212 is carried out repetition (duplicate) address detected (DAD) in step 918, and transmits switching affirmation (HACK) message as the result of DAD to first couple in router 211 or previous couple in router.Carry out the processing of exchange HI message and HACK message and verify whether the NCoA of expection is available.First couple in router, 211 generations that receive HACK message from second couple in router 212 are in the PCoA that is used for mobile node 201 (CoA that PAR uses) of frozen state and the binding item of NCoA (CoA that uses among the NAR).Receive quick Binding Update (FBU) message from mobile node 201 before, do not discharge the binding item that this is in frozen state, and for the binding item that is in frozen state, first couple in router 211 or previous couple in router are not transmitted professional to second couple in router 212.
In case receive HACK message, first couple in router 211 in step 920 to the quick binding acknowledgements of mobile node 201 transmission preparations (PFBACK) message.The mapping that mobile node 201 uses L2 and L3 than (L2: L3) information, during L2 triggers, select successfully to send the target of second couple in router 212 of HACK message as scan channel.Clearer and more definite is, in an embodiment of the present invention, if first couple in router 211 or previous couple in router receive HACK message from second couple in router 212, then it produces and prepares quick binding acknowledgement (PFBACK) message, and PFBACK is sent to mobile node 201.
In case receive PFBACK message, mobile node 201 produces L2 in step 922 and triggers.In addition, the channel that mobile node 201 scannings are used by couple in router in step 920, and selection is as second couple in router 212 of target couple in router.In step 924, mobile node 201 transmits quick Binding Update (FBU) message to first couple in router 211 then.
In step 926a and 926b, first couple in router 211 that receives FBU message transmits quick binding acknowledgement (FBACK) message to the mobile node 201 and second couple in router 212 then.In addition, first couple in router 211 discharges the binding item that is in frozen state, and can be in other binding item of frozen state by overtime automatic elimination.From this moment, mobile node 201 should use the NCoA that can use when it inserts second couple in router 212 or new couple in router, carry NCoA by HI message, and by new couple in router checking, perhaps distributes NCoA by new couple in router.
In step 928, mobile node 201 disconnects the channel that is connected to first couple in router 211.In step 930, first couple in router 211 will be sent to the data forwarding of mobile node to second couple in router 212 or new couple in router.In step 932, mobile node 201 in the search adjacent networks, use according to the information in the ARIP grouping of the present invention only the channel of scanning finite quantity carry out switching.Behind scan channel, mobile node 201 is prepared to connect in step 934.
In step 936, mobile node 201 transmits quick neighbor notification (FNA) message to second couple in router 212 or new couple in router.The FNA message that is sent to second couple in router 212 from mobile node 201 is used for notice: mobile node 201 has been determined NCoA after receiving FBACK message, and inserts new couple in router.In step 938, receive data forwarding that second couple in router 212 of FNA message will receive from first couple in router 211 to mobile node 201.
When using when carrying out switching, provide following advantage in conjunction with the grouping of the ARIP in the method for Fig. 9 description.At first, can omit reverse address transition (with of the processing of L2 maps identifiers) to the L3 identifier.Secondly, use this method, as described in step 918, can realize duplicate address detection (DAD).At last, owing to only carry out scan channel, can reduce the scan channel time to the selected couple in router in the couple in router with by the couple in router of reverse address transition.Come selectivity to make in this way the expense of the previous DAD of execution in the candidate access router that switches to by comparing mobile node.That is,, can select in conjunction with intercommunication (interwork) ARIP comes fast switching method Fig. 7 being used for of describing and in conjunction with described one of the method carried out in advance DAD that is used for of Fig. 9 according to the importance of business.In this case, under the situation that the ARIP intercommunication is switched fast, main appearance prediction is switched fast, seldom occurs reacting fast and switches.
As mentioned above, the invention provides and a kind ofly be used to use ARIP to be grouped in exchange message between the adjacent access router, and between wireless network, carry out the method for the information that transmits to mobile node when switching when mobile node.Use this method, when carrying out L2 and switch, the information that allows mobile node to use to transmit from couple in router is the channel of scanning finite quantity only, and need not scan all channels.Therefore, can reduce L2 and switch required time-delay.By this way, the present invention allows mobile node to carry out quick switching, improves network performance thus.Usually, in order to carry out switching, mobile node should scan all channels in each wireless network.Yet according to the present invention, mobile node is according to the adjacent access router that receives from the couple in router channel of scanning finite quantity only, rather than scans all channels.ARIP grouping according to the present invention can also be used for switching at heterogeneous networks.Use ARIP grouping mobile node can obtain the information about adjacent wireless network, makes it can only scan the channel that uses in adjacent networks, reduces switching time thus.For the scan channel in L2, mobile node is the channel of scanning finite quantity only, rather than scans all channels, therefore helps to reduce switching time.By doing like this, can carry out fast and switch and be indifferent to the ARIP grouping and whether be used for quick switching.In addition, because current mobile IP does not provide the technology that can allow mobile node to select best couple in router, so the ARIP grouping of using the present invention to propose can provide effective switching.
As what understood from foregoing description, the present invention can improve the switch speed of mobile node.In addition, the present invention can even carry out fast between heterogeneous networks and switches.In addition, can support the mobile node that switches fast can select to support the couple in router of switching fast, increase network efficiency thus.
Although represented with reference to definite preferred embodiment of the present invention and described the present invention, but the one of ordinary skilled in the art will be appreciated that and can be under the prerequisite that does not deviate from the aim of the present invention that limited by appended claims and scope the present invention be carried out modification on various forms and the details.
Claims (19)
1. system that is used for providing at the wireless network of supporting mobile IP (Internet Protocol) switching of mobile node comprises:
Mobile node, be used for to the request of current first couple in router transmission of communicating by letter adjacent access router information with mobile node, if and receive adjacent access router information, then use the adjacent access router information that is received, select second couple in router as the target couple in router
Wherein first couple in router and adjacent access router exchange information of access route, in case receive the adjacent access router information request from mobile node, then provide adjacent access router information to mobile node, and second couple in router that the data redirection that will be sent to mobile node will switch to mobile node, and second couple in router will send to corresponding mobile node from first couple in router data that receive, that will be sent to mobile node.
2. the system as claimed in claim 1, wherein mobile node is determined the wireless medium that will use and the priority of channel according to the adjacent access router information that receives between transfer period, the priority scanning channel of determining by basis comes the select target couple in router, and carries out the switching of selected target couple in router.
3. the system as claimed in claim 1, wherein in case receive the adjacent access router information request from mobile node, first couple in router is sent to mobile node with adjacent access router information, if and received quick binding update messages from mobile node, then will be sent to second couple in router that the data redirection of mobile node will switch to mobile node.
4. system as claimed in claim 3, if wherein receive data from first couple in router, then second couple in router will be transferred to the data forwarding of mobile node to corresponding mobile node.
5. the system as claimed in claim 1, wherein for adjacent access router exchange information of access route, if the predetermined update cycle arrives, then first couple in router is sent to adjacent access router with its configuration information; If the update cycle does not arrive, determine whether that then its configuration element changes, and if its configuration element change, the configuration information of its change is sent to adjacent access router; Receive adjacent access router information; With the adjacent access router information that received be stored in adjacent access router information wherein, corresponding relatively, and if by determining that relatively configuration information changes, and then upgrades the information about the adjacent access router of correspondence.
6. the system as claimed in claim 1 is wherein used information of access route agreement (ARIP) to be grouped in and is exchanged information of access route between the adjacent access router.
7. system as claimed in claim 6, wherein ARIP grouping comprise ARIP information field, this field comprise at least the address information of couple in router, the wireless access medium in using, use channel information, support information, service quality (QoS) information, authentication information, network prefix information and voice messaging one of them.
8. system as claimed in claim 7, wherein support information comprises one of quick switching support information and paging support information at least.
9. method that is used for the switching carried out at the wireless network mobile node of supporting mobile IP (Internet Protocol) comprises step:
When needs switch, send the request that is used for adjacent access router information to current couple in router of communicating by letter with mobile node; With
After receiving adjacent access router information, use the switching of the target couple in router that the adjacent access router information and executing receive will switch to mobile node.
10. method as claimed in claim 9, wherein the step of using the adjacent access router information and executing that is received to switch to the switching of target couple in router comprises step:
Determine the wireless medium that between transfer period, will use and the priority of channel according to the adjacent access router information that receives; With
If, then carry out the switching of selected couple in router by having selected the target couple in router according to determined priority scanning channel.
11. method as claimed in claim 10 also comprises step: if mobile node can not be by the definite priority select target couple in router of scanning, then by coming the select target couple in router according to next priority scanning channel.
12. a method that is used for providing at the couple in router of the wireless network of supporting mobile IP (Internet Protocol) switching of mobile node comprises step:
With adjacent access router exchange information of access route; With
In case receive the adjacent access router information request from mobile node, adjacent access router information be sent to mobile node.
13. method as claimed in claim 12 also comprises step: in case receive quick binding update messages from mobile node, the data redirection that will be sent to mobile node is to the target couple in router.
14. method as claimed in claim 13 also comprises step: will receive from couple in router, to be sent to the data forwarding of mobile node to corresponding mobile node.
15. method as claimed in claim 12, wherein the step with adjacent access router exchange information of access route comprises step:
If the predetermined update cycle arrives, then configuration information is sent to adjacent access router,, determines whether that then configuration element changes if the update cycle does not arrive, if and its configuration element change, then the configuration information with its change is sent to adjacent access router; With
In case receive adjacent access router information, with the adjacent access router information that received be stored in adjacent access router information wherein, corresponding relatively, if and by determining that relatively configuration information changes, and then upgrades the information about the adjacent access router of correspondence.
16. method as claimed in claim 12, wherein the step with adjacent access router exchange information of access route comprises step:
In the predetermined cycle configuration information is sent to adjacent access router; With
In case receive adjacent access router information, with the adjacent access router information that received be stored in adjacent access router information wherein, corresponding relatively, if and by determining that relatively configuration information changes, and then upgrades the information about the adjacent access router of correspondence.
17. a method that is used for providing at the wireless network of supporting mobile IP (Internet Protocol) switching of mobile node comprises step:
With adjacent access router exchange information of access route;
Switch if desired, mobile node is to the request of current first couple in router transmission of communicating by letter with mobile node to adjacent access router information;
In case receive the adjacent access router information request from mobile node, then provide adjacent access router information to mobile node by first couple in router;
In case receive to adjacent access router information second couple in router that mobile node will switch to according to adjacent access router Information Selection mobile node;
Transmission is used for making the binding update messages of previous Care-of Address (CoA) that first couple in router can obtain from first couple in router and the new CoA binding that will use at second couple in router; With
In case receive binding update messages, the data redirection that will be sent to mobile node by first couple in router makes second couple in router forward the data to mobile node to second couple in router.
18. a method that is used for providing at the wireless network of supporting mobile IP (Internet Protocol) switching of mobile node comprises step:
Between adjacent access router, exchange information of access route;
Switch if desired, mobile node is to the request of current first couple in router transmission of communicating by letter with mobile node to adjacent access router information;
In case receive the adjacent access router information request, then provide adjacent access router information by first couple in router;
If with the disconnection of communicating by letter of first couple in router, then mobile node uses adjacent access router information that quick neighbor notification message is sent to second couple in router as the target couple in router before receiving quick binding update messages; With
In case receive quick neighbor notification message, send request to the data that will be sent to mobile node according to quick neighbor notification message to first couple in router by second couple in router, if and received data from first couple in router, then will be sent to the data forwarding of mobile node to corresponding mobile node.
19. a method that is used for providing at the wireless network of supporting mobile IP (Internet Protocol) switching of mobile node comprises step:
Between adjacent access router, exchange information of access route;
Switch if desired, mobile node is to the request of current first couple in router transmission of communicating by letter with mobile node to adjacent access router information;
In case receive the adjacent access router information request, then provide adjacent access router information by first couple in router;
In case receive adjacent access router information, second couple in router that will switch to according to the adjacent access router Information Selection mobile node that is received by mobile node, and to the quick binding update messages of the first couple in router transmission preparations, this message is included in the new Care-of Address of the expection of using in selected second couple in router;
Prepare quick binding update messages in case receive, transmit to second couple in router by first couple in router and switch initiation message, and after the new Care-of Address of expection is carried out duplicate address detection, switch acknowledgment message is sent to mobile node;
Produce the binding item be in frozen state by first couple in router, the new Care-of Address that is used for previous Care-of Address that mobile node obtains from first couple in router and will uses at second couple in router;
In case receive quick binding update messages, discharge the binding item that is in frozen state by first couple in router, and quick binding acknowledgement message is sent to the mobile node and second couple in router; With
In case receive quick binding acknowledgement message, carry out the switching of second couple in router by mobile node.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325798B (en) * | 2007-06-15 | 2011-08-10 | 中兴通讯股份有限公司 | Method for selecting mobile management mode in wireless network |
| CN106304219A (en) * | 2015-06-01 | 2017-01-04 | 北京信威通信技术股份有限公司 | A kind of method being switched fast in mobile communication system |
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| KR100662885B1 (en) * | 2005-02-04 | 2007-01-02 | 삼성전자주식회사 | The handoff method which secure the seamless transmission of the TCP packet in the FMIPv6 |
| KR101187071B1 (en) * | 2006-01-05 | 2012-09-27 | 엘지전자 주식회사 | method for handover in mobile communication system |
| KR100760957B1 (en) * | 2006-05-03 | 2007-09-21 | 경북대학교 산학협력단 | Methods and system for intelligent fast handover using multiple pre-registrations in wireless lan/man |
| KR100765795B1 (en) * | 2006-10-20 | 2007-10-15 | 삼성전자주식회사 | Method and apparatus for providing handover information to mobile node |
| KR100825114B1 (en) * | 2006-11-24 | 2008-04-25 | 모다정보통신 주식회사 | Handover apparatus of wibro and the method thereof |
| MY146667A (en) * | 2007-08-15 | 2012-09-14 | Mimos Berhad | A method to maintain mobile ipv6 connectivity in mixed protocol access environment |
| KR101360351B1 (en) * | 2007-11-09 | 2014-02-07 | 삼성전자주식회사 | Method of controlling handover and device for eanabling the method |
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| WO2003049462A1 (en) | 2001-12-03 | 2003-06-12 | Nokia Corporation | Context filter in a mobile node |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325798B (en) * | 2007-06-15 | 2011-08-10 | 中兴通讯股份有限公司 | Method for selecting mobile management mode in wireless network |
| CN106304219A (en) * | 2015-06-01 | 2017-01-04 | 北京信威通信技术股份有限公司 | A kind of method being switched fast in mobile communication system |
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| CN100589336C (en) | 2010-02-10 |
| KR20050037325A (en) | 2005-04-21 |
| KR101015697B1 (en) | 2011-02-22 |
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