CN1625139A - Method of non-allocation indifferent accessing of mobile IP terminal - Google Patents
Method of non-allocation indifferent accessing of mobile IP terminal Download PDFInfo
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- CN1625139A CN1625139A CNA2004100814383A CN200410081438A CN1625139A CN 1625139 A CN1625139 A CN 1625139A CN A2004100814383 A CNA2004100814383 A CN A2004100814383A CN 200410081438 A CN200410081438 A CN 200410081438A CN 1625139 A CN1625139 A CN 1625139A
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Abstract
This invention discloses a random connective method of movable IP terminal without collocation. When the movable terminal is linked to the acting node of other place, send the movable terminal registering information to the acting node of other place, the agent of other place receives the IP address; the agent of other place receives the movable terminal registering information and sends movable terminal adding information to all nodes, and the information includes IP address of the movable IP terminal, interface IP network address of the agent; each network node sets information form of movable users and stores the information in the information form; according to the corresponding relation between the IP address of the movable IP terminal in the information form and the interface IP address, establish the direct communication channel from the access terminal to the movable IP terminal. In this way, it avoids the flux centralization between the home agent and abroad agent and improves the utility efficiency and performance of the network.
Description
Technical field
The present invention relates to the method that a kind of mobile IP terminal non-allocation indifferent inserts.
Background technology
At present, the standard mobile IP protocol that moves at the IP terminal mainly is the relevant documentation of being formulated by IETF, mainly contain: RFC2002, RFC2003, RFC2005, RFC2006 etc., it can realize mobile IP terminal arbitrarily moving in network, and do not need mobile IP terminal is carried out any configuration, not making amendment in the IP address of mobile IP terminal, comprises manually or automatically revising.
Home agent: the router or the switch that link to each other before a port being arranged and mobile IP terminal not moving, it preserves the current location information of portable terminal always.Foreign Agent: have a port and mobile IP terminal to move router or switch that the back links to each other.In existing standard mobile IP protocol, the access process that the mobile IP terminal non-allocation indifferent inserts is seen Fig. 1, and concrete steps are as follows:
First step S1: home agent and Foreign Agent are periodically broadcasted a kind of broadcast of acting on behalf of, and all the IP terminals on the link all can receive this message;
The second step S2: broadcast is acted on behalf of in the mobile IP terminal inspection, and oneself is connected on home agent or the Foreign Agent by its judgement;
The 3rd step S3: if mobile IP terminal is not connected on the Foreign Agent, then carry out the 4th step S4, carry out according to the common communications mode; If mobile IP terminal is connected on the Foreign Agent, it needing to obtain the Care-of Address that uses in subsequently data transmit from act on behalf of broadcast, and promptly home agent is outwards acted on behalf of the tunnel exit IP address of transmitting data, enters the 5th step S5;
The 5th step S5: mobile IP terminal is registered above-mentioned Care-of Address to home agent;
The 6th step S6: home agent and the broadcasting of other network nodes are to the accessibility of mobile IP terminal home address, therefore absorb the bag that mails to the mobile IP terminal home address, the bag of mobile IP terminal home address is sent in the home agent intercepting, and by the mobile IP terminal location information table of inquiry in local Agency maintenance, judge the particular location at current mobile IP terminal place, be sent to its Care-of Address then by the tunnel, promptly refer to the Foreign Agent place;
The 7th step S7: Foreign Agent takes out raw data packets and sends to mobile IP terminal from the tunnel, the network service after finishing mobile IP terminal and moving.
At present, the use of wireless relay channel is more and more, and for some the private IP network networks based on wireless channel, the bandwidth of the interconnection trunk between its each telephone net node is very limited, generally is no more than to be 2M bps.In this class network that adopts present standard mobile IP protocol, all data services that other terminal need be communicated by letter with certain mobile IP terminal all need to transmit with tunnel style by home agent, are transmitted to portable terminal by Foreign Agent again.To cause trunk channel flow the concentrating very between home agent and the Foreign Agent so inevitably, communication performance bottleneck occur.Yet this moment, other trunk channels but still seemed the comparison free time, false network congestion phenomenon occurred.Therefore, the enforcement that the service efficiency of network and performance all can descend, IP service quality guarantees also becomes very difficult.As shown in Figure 2, home agent is switch SW1, Foreign Agent is switch SW4, when IP terminal T1～T4 visited mobile IP terminal MT simultaneously, network proposed to concentrate bandwidth requirement by switch SW3, SW2, SW1 to repeated link L1, need 4 service channels among the figure, 4 chain-dotted lines among the figure are represented service channel, and repeated link L2, L3 do not use, thereby cause the appearance of the false busy situation of network.
Summary of the invention
Goal of the invention of the present invention is to overcome above-mentioned deficiency, provide a kind of elimination above-mentioned standard mobile IP protocol, the network congestion of the falseness that occurs in the band-limited wireless channel network environment of trunk channel guarantees that communication is unobstructed to greatest extent, and keeps the method for non-allocation indifferent access function.
For achieving the above object, the method that a kind of mobile IP terminal non-allocation indifferent of the present invention inserts may further comprise the steps:
(1), shifts out home agent when mobile IP terminal, when being linked into the Foreign Agent node, mobile IP terminal is outwards acted on behalf of and is sent the portable terminal registration message, and Foreign Agent obtains the IP address of mobile IP terminal, and sets up the annexation of Foreign Agent and mobile IP terminal;
(2), Foreign Agent receives the portable terminal registration message, Foreign Agent sends portable terminals to all nodes that comprise home agent and adds message, this message comprises the IP address of mobile IP terminal, the access interface IP network address at Foreign Agent place;
(3), on each network node, establish the information of mobile user table; Other nodes are deposited into this message content in the information of mobile user table after receiving portable terminal interpolation message;
(4), when each network node is connected terminal need visit mobile IP terminal the time, according to the IP address of the mobile IP terminal in the information of mobile user table and the corresponding relation of access interface IP network address, set up the communication port that access end directly arrives mobile IP terminal.
Goal of the invention of the present invention is to realize like this, owing to set up the communication port that access end directly arrives mobile IP terminal, just no longer need to transmit by home agent, avoid trunk channel flow the concentrating very between home agent and the Foreign Agent like this, the generation of communication performance bottleneck problem occurred.Thereby, improved the service efficiency and the performance of network.
Description of drawings
Fig. 1 is non-allocation indifferent access process figure in the standard mobile IP protocol;
Fig. 2 is that the non-allocation indifferent access causes network bottleneck process schematic diagram in the standard mobile IP protocol;
Fig. 3 is the present invention concrete implementing procedure figure in the MPLS switch;
Fig. 4 is the access process schematic diagram after the present invention sets up the communication port of mobile IP terminal visit;
Fig. 5 is that the information of mobile user table was safeguarded schematic diagram after mobile IP terminal of the present invention moved;
Fig. 6 be mobile IP terminal shown in Figure 5 once more the information of mobile user table safeguard schematic diagram;
Fig. 7 is that mobile IP terminal shown in Figure 6 is retracted the home agent user message table and safeguarded schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the method that mobile IP terminal non-allocation indifferent of the present invention is inserted is described in further detail and describes.
Fig. 1 is non-allocation indifferent access process figure in the standard mobile IP protocol, and Fig. 2 is that the non-allocation indifferent access causes network bottleneck process schematic diagram in the standard mobile IP protocol.Among the figure, all data services that other terminal need be communicated by letter with certain mobile IP terminal all need to transmit with tunnel style by home agent, are transmitted to portable terminal by Foreign Agent again.To cause trunk channel flow the concentrating very between home agent and the Foreign Agent so inevitably, communication performance bottleneck occur.
Below be the method that mobile IP terminal non-allocation indifferent of the present invention inserts, based on the specific embodiments in the special-purpose MPLS switch of ATM, MPLS is the english abbreviation of multi protocol label exchange, may further comprise the steps:
(1), mobile IP terminal moves out former place this genus network, after being home agent, inserting new network node, when being Foreign Agent, need mobile IP terminal initiatively to current MPLS switch, be that Foreign Agent sends the portable terminal registration message, be specially and send multicast UDP message, establish a connection with current MPLS switch simultaneously;
(2), after local MPLS switch receives this registration message, send portable terminals by signalling path other MPLS nodes in network that transmit mpls protocol message and add message.All nodes that comprise home agent all can be known the specifying information of this mobile IP terminal; This message comprises: the IP address of mobile IP terminal, the current place of terminal IP network address;
(3), after other MPLS nodes receive this interpolation message, at first in the information of mobile user table of oneself safeguarding, search the register information whether this IP End of Address is arranged.If have, represent that this mobile IP terminal once moved, directly cover this information, just needing after mobile IP terminal moves once more to have realized like this in the last time cancellation operation of position; Add the information of mobile user table to if no, directly portable terminal is added the content of message;
Portable terminal adds the transport process of message in the MPLS network:
The MPLS node that receives the portable terminal registration message produces this message, and all trunking ports to the operation mpls protocol send this message simultaneously;
After middle MPLS node is received this message, judge whether to receive with this message in mobile terminal IP address, the identical user's mobile messaging of its current location subnet number.If do not receive, these information of record are transmitted this message to all trunking ports except that the port of receiving this message simultaneously in the information of mobile user table.Whether this recording process is as follows: at first judging has had in the table and the identical record in current mobile IP terminal IP address, if having, needs to cover original record, actual having finished the cancellation work of portable terminal at previous node place; If no, direct record; If received this message, it directly abandoned;
(4) when other IP terminals need be visited mobile IP terminal, at first in the information of mobile user table, search this target ip address and whether register; If no, expression is the calling to fixed-line subscriber, handles getting final product by standard mpls protocol process; If have, take out the local subnet number at the current place of mobile subscriber in the information of mobile user table, carry out route according to this address, to handle by standard MPLS process then, the source end of foundation directly arrives the communication port of mobile IP terminal.
(5), when mobile IP terminal moves to other subnets once more, carry out same registration operation, continue to handle according to step 2 once more simultaneously;
(6), when mobile IP terminal is retracted former network, send " portable terminal deletion message " by the current MPLS node that connects to all MPLS trunking ports, after other nodes are received this message, the corresponding list item of the information of mobile user list deletion in this locality, and continue to transmit this message to other nodes.
Fig. 3 is the present invention concrete implementing procedure figure in the MPLS switch.Among the figure:
First step ST1: mobile IP terminal sends the portable terminal registration message;
The second step ST2: the current MPLS switch that connects detects this mobile IP terminal;
The 3rd step ST3: judge that this terminal is in this genus network? if do not exist, then change the 4th step ST4 over to, if, then change the 8th step ST8 over to;
The 4th step ST4: this switch produces portable terminal and adds message, and sends to all trunking ports, simultaneously at information of mobile user table of local maintenance;
The 5th step ST5: receive intermediate node recording-related information in the information of mobile user table of this interpolation message, and continue to transmit;
The 6th step ST6: will safeguard a unified information of mobile user table on final each switch of the whole network;
The 7th step ST7: thereafter, when other-end and communication of mobile terminal need be set up communication port, will set up portable terminal and other users' direct communication passage by MPLS according to the information of mobile user table.
The 8th step ST8: switch produces portable terminal deletion message, and sends to all trunking ports, deletes the corresponding list item in the local information of mobile user table simultaneously.
The 9th step ST9: the intermediate node of receiving this deletion message is removed relative recording information in the information of mobile user table, and continues to transmit;
The tenth step ST10: the mobile message record that will remove this mobile IP terminal correspondence on final each switch of the whole network;
The 11 step ST11: this mobile IP terminal recovers communicating by letter of non-moving state and other-end to be undertaken by normal flow.
Fig. 4 is the access process schematic diagram after the present invention sets up the communication port of mobile IP terminal visit.Among the figure, because access end and mobile IP terminal have been set up direct communication port, each terminal T1, T2 in the network topology structure, when T3, T4 communicate by letter with mobile IP terminal MT, just can realize the reasonable distribution of service traffics, link L1, the L2, the L3 that link to each other with switch SW4 all have flow distribution, avoid trunk channel flow the concentrating very between home agent and the Foreign Agent like this, the generation of communication performance bottleneck problem occurred.Thereby, improved the service efficiency and the performance of network.
Fig. 5 is that the information of mobile user table was safeguarded schematic diagram after mobile IP terminal of the present invention moved;
Fig. 6 be mobile IP terminal shown in Figure 5 once more the information of mobile user table safeguard schematic diagram;
Fig. 7 is that mobile IP terminal shown in Figure 6 is retracted the home agent user message table and safeguarded schematic diagram.
For further understanding the present invention, in Fig. 5, Fig. 6, Fig. 7, showed the present invention on the MPLS switch in the specific implementation process, after mobile IP terminal moves, information of mobile user table maintenance process schematic diagram.
(1), in the present embodiment, the several message and the data structure of use
■ portable terminal registration message
Send to switch by mobile IP terminal, employing realizes that to the mode that specific multicast IP address (as 224.1.1.1) sends the UDP message bag the concrete form in UDP message territory is: 01234567012345670123456701234567
| Type of message (0x88) | Message-length | Keep |
| Mobile IP terminal IP address | ||
| The mobile IP terminal subnet mask | ||
| The mobile IP terminal gateway address | ||
| Keep territory (verification) | ||
Table 1
The ■ portable terminal adds message
Adopt the reference format and the load mode of mpls protocol, produce by the MPLS switch that inserts portable terminal, and between switch, transmit.0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7
| ??1 | Type of message (0x3E01) | Message-length |
| Message id | ||
| Message id during message origination | ||
| The origination node LSR ID of message | ||
| Mobile IP terminal IP address | ||
| The mobile IP terminal subnet mask | ||
| The current place of mobile IP terminal IP network address | ||
Table 2
■ portable terminal deletion message
Adopt the reference format and the load mode of mpls protocol, produce by the MPLS switch that inserts portable terminal, and between switch, transmit.0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7???0???1???2???3???4???5???6???7
| ??1 | Type of message (0x3E02) | Message-length |
| Message id | ||
| Mobile IP terminal IP address | ||
| The mobile IP terminal subnet mask | ||
| Mobile IP terminal belongs to IP network address originally | ||
Table 3
■ information of mobile user table
" information of mobile user table " structure of being safeguarded by each switch is as follows:
Struct mplsMobileHostTable/* information of mobile user table */
{
Unsigned char flag; / *=TRUE represent to write down effective */
Unsigned int routeInfId; The registration message ID that/* receives: be used for same message
Repeat to receive identification */
Unsigned int hostAdr; / * mobile terminal IP address */
Unsigned int newSubsetAdr; / * portable terminal current network address */
}；
(2), portable terminal processing example when mobile in network
The ■ mobile IP terminal moves for the first time
Be that mobile IP terminal belongs to network from this, promptly local agent moves to current network, i.e. Foreign Agent.As shown in Figure 5, refer to that mobile IP terminal MT belongs to network from this, promptly a port of switch SW1 moves to current network, promptly on a port of switch SW4.
Switch SW4: receive portable terminal registration message Re from port a, the IP address 192.168.1.2 of mobile IP terminal MT is added in the middle of " the information of mobile user table " of switch SW4 into the annexation that switch SW4 and mobile IP terminal MT set up.The data structure of " information of mobile user table ", as shown in table 4.Produce " portable terminal adds message Am " then, send from switch SW4 port b, c, d.
| Flag bit | Message id | The mobile terminal IP address | Current network IP address |
| TRUE | Concrete ID | 192.168.1.2 | 192.168.4.0 |
| …… | …… | …… | …… |
Table 4
Switch SW1, SW2, SW3: will receive that from separately port b, c, the d that links to each other with switch SW4 portable terminal adds message Am respectively, in " information of mobile user table ", " information of mobile user table " data structure is as shown in table 4 with relevant information records for each switch.Transmit this message to the port of not receiving this message respectively simultaneously, specifically: switch SW1 to port c send, switch SW2 to port b and d send, switch SW3 sends to port b.
Repetition message is handled: switch SW1, SW2, SW3 may receive once more that portable terminal adds message Am, but by in the message with " message id during message origination " field can simply judge whether to receive, if receive directly to abandon, no longer transmit processing.
Data channel is set up and handled: suppose that now IP terminal T2 need communicate by letter with mobile IP terminal MT, switch SW2 receives user's passage and sets up application, and this application requires to be established to the passage of 192.168.1.2.Switch SW2 at first searches in " information of mobile user table ", discovery be will with the telex network of moving, promptly set up the communication port that directly arrives mobile IP terminal current network 192.168.4.0, rather than arrive the circuitous channel of 192.168.1.0 network by the flow process of mpls protocol.Thereby communication can directly be carried out, and do not need the forwarding of home agent.The communication process of other IP terminal T1, T3, T4 and mobile IP terminal is similar.
The ■ mobile IP terminal moves once more
Be that mobile IP terminal continues to move to another Foreign Agent from a Foreign Agent.Promptly as shown in Figure 6, mobile IP terminal continues to move on a port of switch SW3 from a port of switch SW4.
Switch SW3: receive portable terminal registration message Re from port a, switch SW3 will search the information of terminal user of finding 192.168.1.2 and exist in " information of mobile user table ", but the current network address that mobile IP terminal connected has changed, become and be 192.168.3.0, so it is 192.168.3.0 that switch SW3 will revise the address of " current network IP address " in " information of mobile user table ", the data content of " information of mobile user table " is as shown in table 5 at this moment.Produce portable terminal then and add message Am, send from its port c, d.
| Flag bit | Message id | The mobile terminal IP address | Current network IP address |
| TRUE | Concrete ID | 192.168.1.2 | 192.168.3.0 |
| …… | …… | …… | …… |
Table 5
Switch SW2, SW4: will receive that from separately port d, the c that links to each other with switch SW3 portable terminal adds message Am respectively, switch SW2 and SW4 will search the mobile terminal subscriber information of finding 192.168.1.2 and exist in " information of mobile user table ", but the current network address that portable terminal connected has changed, becoming and be 192.168.3.0, is 192.168.3.0 so will revise the address of " current network IP address " in " information of mobile user table " separately." the information of mobile user table " of each switch is with as shown in table 5 at this moment.Transmit this message to the port of not receiving this message respectively simultaneously, specifically: switch SW2 to port b and c send, switch SW2 sends to port b and d.
Switch SW1: will receive that portable terminal adds message Am, revises " information of mobile user table " according to the mode of switch SW2, SW4 then from port b and c.According to the priority difference of receiving this message from port, may also need to transmit this message to port b or c.
Repetition message is handled and data channel is set up processing: all identical with said process.
The ■ mobile IP terminal is retracted this genus network
Be that mobile IP terminal continues to move back to this genus network from current place network.As shown in Figure 7, mobile IP terminal moves back on the switch SW1 port a from switch SW3 port a.
Switch SW1: receive portable terminal registration message Re from port a, switch SW1 will find that the IP address 192.168.1.2 of portable terminal and current network address 192.168.1.0 are at the same network segment, show that mobile IP terminal retracted this genus network, need with in " information of mobile user table " on other the node in the network about the information deletion of mobile IP terminal.At first, about the information of this mobile IP terminal, produce portable terminal deletion message Dm then in " the information of mobile user table " of its deletion this locality, send from port b and c.
Switch SW2, SW4: will receive " portable terminal deletion message " from port c, the b that links to each other with switch SW1 respectively, and search the record that the 192.168.1.2 terminal is found to exist in " information of mobile user table " back, with its deletion.Transmit this message to the port of not receiving this message respectively then, specifically: switch SW2 to port c and d send, switch SW4 sends to port c and d.
Switch SW3: will receive portable terminal deletion message Dm from port b and c, and delete in " information of mobile user table " record according to the mode of switch SW2, SW4 then about the 192.168.1.2 terminal.According to the priority difference of receiving this message from port, may also need to transmit this message to port b or c.
The processing of repetition message: switch SW2, SW3, SW4 all may receive the portable terminal deletion message Dm of repetition, owing to can't find relevant information at " information of mobile user table ", will abandon this message, needn't carry out any operation.
Data channel is set up and handled: because portable terminal has been got back to this genus network, its communication process will be the same with common communications, without any special processing.
This method solves with in the main networking mode of band-limited wireless channel as IP network, when if the standard of employing mobile IP protocol realizes that the non-allocation indifferent of mobile IP terminal inserts, all need to transmit, thereby may cause the phenomenon of false network congestion by home agent.This technical scheme successfully realizes in based on the special-purpose MPLS switch of ATM, and the mobile IP terminal communication efficiency is easy, stable, has improved the transmission total capacity of network.
The method that mobile IP terminal non-allocation indifferent of the present invention inserts is not limited to the scope of embodiment, and all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (2)
1. the method that the mobile IP terminal non-allocation indifferent inserts is characterized in that, may further comprise the steps:
(1), shifts out home agent when mobile IP terminal, when being linked into the Foreign Agent node, mobile IP terminal is outwards acted on behalf of and is sent the portable terminal registration message, and Foreign Agent obtains the IP address of mobile IP terminal, and sets up the annexation of Foreign Agent and mobile IP terminal;
(2), Foreign Agent receives the portable terminal registration message, Foreign Agent sends portable terminals to all nodes that comprise home agent and adds message, this message comprises the IP address of mobile IP terminal, the access interface IP network address at Foreign Agent place;
(3), on each network node, establish the information of mobile user table; Other nodes are deposited into this message content in the information of mobile user table after receiving portable terminal interpolation message;
(4), when each network node is connected terminal need visit mobile IP terminal the time, according to the IP address of the mobile IP terminal in the information of mobile user table and the corresponding relation of access interface IP network address, set up the communication port that access end directly arrives mobile IP terminal.
2. the method that non-allocation indifferent according to claim 1 inserts is characterized in that, and is further comprising the steps of:
After mobile IP terminal was retracted in this genus network, switch produced the mobile subscriber and deletes message, and sent to all trunking ports, deleted the corresponding list item in the local information of mobile user table simultaneously;
Receive that the intermediate node of this deletion message removes relative recording information in the information of mobile user table, and continue to transmit;
To remove the mobile message record of this mobile IP terminal correspondence on final each switch of the whole network, this mobile IP terminal recovers communicating by letter of non-moving state and other-end to be undertaken by normal flow.
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| CNB2004100814383A CN100359878C (en) | 2004-12-09 | 2004-12-09 | Method of non-allocation indifferent accessing of mobile IP terminal |
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| CNB2004100814383A CN100359878C (en) | 2004-12-09 | 2004-12-09 | Method of non-allocation indifferent accessing of mobile IP terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007134498A1 (en) * | 2006-05-24 | 2007-11-29 | Zte Corporation | A system and method for implementing the mobile ip access |
| CN101589584A (en) * | 2007-01-18 | 2009-11-25 | 日本电气株式会社 | Mobile ip control system, mobile ip control method, and mobile ip control program |
| CN101341712B (en) * | 2005-10-11 | 2013-05-01 | 高通股份有限公司 | Wireless terminal methods and apparatus for establishing connections |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6535493B1 (en) * | 1998-01-15 | 2003-03-18 | Symbol Technologies, Inc. | Mobile internet communication protocol |
| SG108302A1 (en) * | 2001-08-13 | 2005-01-28 | Ntt Docomo Inc | Packet transmission system, and apparatus and method for controlling packet transmission route |
| JP4289030B2 (en) * | 2002-07-30 | 2009-07-01 | パナソニック株式会社 | Mobility management method and mobile terminal |
| US6850532B2 (en) * | 2002-09-20 | 2005-02-01 | Cisco Technology, Inc. | Arrangement in a gateway for registering mobile routers of a mobile ad hoc network to respective home agents |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101341712B (en) * | 2005-10-11 | 2013-05-01 | 高通股份有限公司 | Wireless terminal methods and apparatus for establishing connections |
| WO2007134498A1 (en) * | 2006-05-24 | 2007-11-29 | Zte Corporation | A system and method for implementing the mobile ip access |
| CN101079704B (en) * | 2006-05-24 | 2010-08-18 | 中兴通讯股份有限公司 | System and method for implementing mobile IP access |
| CN101589584A (en) * | 2007-01-18 | 2009-11-25 | 日本电气株式会社 | Mobile ip control system, mobile ip control method, and mobile ip control program |
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