CN101242357B - A realization method for mobile IP user notification service - Google Patents
A realization method for mobile IP user notification service Download PDFInfo
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- CN101242357B CN101242357B CN2008100041097A CN200810004109A CN101242357B CN 101242357 B CN101242357 B CN 101242357B CN 2008100041097 A CN2008100041097 A CN 2008100041097A CN 200810004109 A CN200810004109 A CN 200810004109A CN 101242357 B CN101242357 B CN 101242357B
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Abstract
The invention discloses an implementation method of a mobile IP user notification service, by which a mobile IP user can acquire the accessed information record when the user is off-line. The method comprises the steps that: when the mobile IP user is in off-line state, a home agent HA saves the data massages sent by other terminals or hosts; and when the user is on-line again, HA informs the user of the accessed information when the user is off-line. The method realizes saving the accessed detailed information of the mobile IP user in off-line state, with the mobile IP service system being changed and being affected least, so that the mobile IP user can get the missed accessed information when the user is on-line again.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of implementation method of mobile IP user notification service.
Background technology
Mobile IP, it is a kind of scheme that locomotive function is provided on fhe global the Internet, it has extensibility, reliability and fail safe, and make node when handoff links, still can keep ongoing communication, mobile IP provides a kind of IP routing mechanism, and mobile node can be connected on any link with a permanent home IP address.
Home agent HA (Home Agent), it is a router that is positioned on the mobile IP user home network, this router is that data message is created the tunnel so that data message is sent to mobile IP user when portable terminal is not on home network, and is responsible for safeguarding the mobile IP user current location information.When mobile IP user leaves home network, need register to HA; HA is sent to mobile IP user by the tunnel (tunnel) between HA and the foreign agent FA (Foreign Agent) with data message when receiving the data message that mails to mobile IP user, finish mobile IP function.
When mobile IP user switched chain, home agent notified mobile IP user its current location always, and this information is kept in its Care-of Address by mobile IP user.Home agent broadcasting is to the accessibility of mobile IP user home address network prefix, thereby attract those IP that is sent to mobile IP user home address bags, the bag of mobile IP user home address is sent in parsing, and these bags are sent on the Care-of Address of mobile node by tunneling technique.
Foreign agent FA is a router that is positioned on the mobile IP user current accessed network, and this router provides route service for the registration mobile IP user.Foreign Agent is sealed off home agent (detunnel) and these data messages is sent to mobile IP user by the data message that the tunnel sends.For the data message that sends from mobile IP user, Foreign Agent is as the default router of this registration mobile IP user.
When mobile IP user is in off-line state, when having other users or main frame need visit this user, can't obtain with the home address of this mobile IP user to get in touch, and this mobile IP user also can't be learnt situation accessed under the off-line state.Even this just causes mobile IP user to have permanent home address, still can miss the visit of other-end, can't learn information accessed under the off-line state.
As seen, when the user is on line state once more, can obtain the accessed urgent problem that has been recorded as under the off-line state.
Summary of the invention
The invention provides a kind of implementation method of mobile IP user notification service, make mobile IP user can obtain its accessed information record when off-line state.
In order to solve the problems of the technologies described above, the invention provides a kind of implementation method of mobile IP user notification service, comprising:
When mobile IP user was in off-line state, local agent HA preserved other-end or main frame mails to this user's data message; When the user was online once more, HA informed its information accessed when off-line state of this user.
Further, described method further comprises: when HA receives the data message that mails to registered mobile IP user, whether detect this user earlier online, if it is online, then this data message is sent to described mobile IP user, if this user off-line is then preserved accessed information, when this mobile IP user was reached the standard grade, the accessed message of this user that HA will preserve sent to this user.
Further, HA sets up concordance list and accessed information table, determines accessed off-line mobile IP user by this concordance list is unique, and the accessed information table address of described mobile IP user correspondence;
When HA preserves accessed information, accessed information is saved in the accessed information table, and sets up the incidence relation of this accessed information table and described accessed off-line mobile IP user;
When HA reads accessed information, search described concordance list according to the user ID of described accessed off-line mobile IP user and obtain accessed information table address, and then obtain accessed information.
Further, described concordance list comprises Hash table and access index table, the access index table of corresponding one a group of mobile IP user of Hash table, wherein:
Hash table is used to store the hash index access index table address corresponding with it;
The access index table, the access index that is used to store each mobile IP user, the address of unique its accessed information table of indication of the access index of each mobile IP user with identical hash index;
Described by the unique definite accessed off-line mobile IP user of this concordance list, and the accessed information table address of described mobile IP user correspondence is meant: find the access index table by Hash table, find accessed information table by the access index table again.
Further, described HA preserves accessed information and further may further comprise the steps:
(a) after HA receives the data message of visit off-line mobile IP user, use hash algorithm to calculate and obtain hash index Index according to this accessed user's user ID;
(b) in Hash table, seek the access index table corresponding with this Index according to Index, if find, execution in step (c), if do not find, execution in step (e);
(c) in the access index table corresponding, search the visit information record that judges whether to exist described mobile IP user correspondence according to the user ID of accessed mobile IP user, if having execution in step (d), otherwise execution in step (e) with Index;
(d) newly-built one accessed information table writes accessed information, and preserves described accessed information table address in described access index table, finishes;
(e) newly-built one accessed information table writes accessed information; A newly-built access index table, the address of wherein preserving the user ID of the accessed mobile IP user visit information table corresponding with it, and in Hash table, preserve the corresponding relation of described access index table and Index, end.
Further, comprise hash index and access index table address in the described Hash table, wherein: hash index Index, use the hexadecimal home address of mobile IP user to calculate by HA; The access index table address, the access index of first mobile IP user that is used for storing the Index correspondence is in the address of buffer memory;
Described access index table, be used to store the access index of each mobile IP user with identical hash index, the data field of the accessed information of mobile IP user of the unique indication of the access index of each mobile IP user, comprise: off-line mobile IP user home address, at the accessed information table address of this mobile IP user, and next access index address data area with mobile IP user of identical hash index.
Further, described accessed information table is used to store the accessed information of off-line mobile IP user, comprising: the source information of calling party: the information of the mobile IP user that sends datagram to the off-line mobile IP user; Timestamp: HA receives the time of this data message; Data: access originator is to the content of the data message of this mobile IP user transmission.
Further, also comprise in the described accessed information table: length: access originator is to the length of the data message of mobile IP user transmission; The next accessed information of this mobile IP user: the address of depositing the next accessed information of this user place.
Further, the accessed message of this user that described HA will preserve sends to this user one of in the following ways: send a notification message to this user, the information reproduction that this user who preserves is accessed sends to the user in IP datagram literary composition data; Send redirected chained address to this user, the user is by clicking this address, the accessed information when obtaining off-line.
Further, described user ID is the home address of mobile IP user.
The present invention is changing existing mobile IP service system and is influencing under the minimum situation, realized the function of the accessed details of mobile IP user under the buffer memory off-line state in HA, make that mobile IP user can be when online once more, obtain the accessed information of missing under the off-line state from HA.
Description of drawings
Fig. 1 is the hash table data field form schematic diagram of mobile IP user in the present embodiment;
Fig. 2 is an access index data field form schematic diagram in the present embodiment;
Fig. 3 is an accessed information data district form schematic diagram in the present embodiment;
Fig. 4 is the flow chart of the accessed information of HA buffer memory off-line mobile IP user in the present embodiment.
Embodiment
Be elaborated below in conjunction with the enforcement of accompanying drawing to technical solution of the present invention.
Design philosophy of the present invention is exactly that HA is according to the User Status of self preserving, when the user is in off-line state, preserve other-end or main frame and mail to the user data message, when the user is online once more, HA informs this user accessed information under its off-line state, comprises IP address, access time and the accessed content of access originator.
HA is responsible for collecting and intercept and capture and mails to any one at the data message of the mobile IP user of HA registration.When HA received the data message that mails to mobile IP user, whether online, if online, then data message is sent to mobile IP user if detecting this user earlier; If this user is off-line, then the data message buffer memory is got up, when this mobile IP user was reached the standard grade, the accessed message of this user that HA will preserve sent to this user.
For this reason, need in HA, increase the data cached district that preserves the accessed information of off-line mobile IP user.In the present embodiment, in data cached district, design three data fields and be used to store the accessed information of mobile IP user, comprise: hash (Hash) table, access index data field (hereinafter to be referred as the access index table) and accessed information data district (hereinafter to be referred as accessed information table), a hash shows corresponding one group of user's access index table, wherein each user has at least one accessed information table, more than three tables all adopt list structure.
The buffer memory of depositing the accessed information of mobile IP user obtains from the heap data district, when HA receives the data message of visit off-line mobile IP user for the first time, one section access index data field of application and one section accessed information data district from the heap data district, when receiving the data message of the same mobile IP user of visit once more, as long as one section accessed information data district of application.
Specify as follows:
The hash table, be used to write down the hash index access index table address corresponding with it, can utilize the mobile IP user identification information to calculate hash index, choosing any one hash algorithm calculates, use the input value of the hexadecimal value of accessed off-line mobile IP user home address in the present embodiment as hash, with the index of exporting as this mobile IP user is hash index, the data format of Hash table as shown in Figure 1, comprising hash index and the corresponding address that is used for memory access indexed data district thereof:
Hash index (Index), HA use the hexadecimal home address of mobile IP user to calculate, and take 4 bytes;
Because after calculating by hash, Index might corresponding a plurality of mobile IP users, therefore need further obtain access index at some mobile IP users by searching the access index table;
Access index table address (following represent) with Point 1, the access index of mobile IP user that is used for storing the Index correspondence is in the address of buffer memory, because corresponding a plurality of mobile IP users of Index possibility, therefore first address of mobile IP user access index in buffer memory of having write down this Index correspondence among the Point1 takies 4 bytes.
The access index table, be used to store the access index of each mobile IP user with identical hash index, the data field of the accessed information of mobile IP user of the unique indication of the access index of each mobile IP user, the access index sheet format as shown in Figure 2, store the address of the data field of accessed information and next access index address data area comprising the home address of mobile IP terminal and corresponding being used to thereof with mobile IP user of identical hash index:
Mobile IP user home address (MS IP): be used to deposit the home address of off-line mobile IP user, take 4 bytes;
At the accessed information data regional address of this terminal (following represent with Point 2): accessed information leaves the address in the buffer memory under this mobile IP user off-line state, and promptly the address of the accessed information table of this user takies 4 bytes;
The next one has the access index address data area (following represent with Point 3) of the mobile IP user of identical hash index: use the hash algorithm to obtain the address of mobile IP user index information in buffer memory of same index number, take 4 bytes.
Accessed information table is used to store the accessed information of off-line mobile IP user, and Fig. 3 is accessed information table form, wherein:
The source information of calling party (Source IP): the information (for example source IP address) of the mobile IP user that sends datagram to this off-line mobile IP user takies 4 bytes;
Timestamp (Stamp): HA receives the time of this data message, takies 4 bytes;
Length (Length): access originator determines that according to data (data) take 2 bytes, this information is optional to the length of the data message of mobile IP user transmission;
Data (Data): access originator is to the content of the data message of this mobile IP user transmission;
The next accessed information of this mobile IP user (following represent with Next): deposit the address at the next accessed information of this user place, take 4 bytes, this information is optional.
As shown in Figure 4, the step of the accessed information of HA buffer memory off-line mobile IP user is as follows:
HA receives the data message that mails to certain mobile IP user, and the purpose IP address of this data message is exactly a home IP address.If home IP address be belong to HA (home agent must dispose the mobile security association of home address and each home address of mobile node, referring to RFC2002), then the mobility binding tabulation of preserving according to HA (comprises home IP-address, Care-of Address etc. are referring to RFC2002) judge whether home IP address is online, if the entry of this home IP is arranged in the list of bindings, then the user is online, otherwise not online, if mobile IP user is online, HA directly forwards message; Otherwise HA carries out this flow process.
Step 103 finds the access index table according to Point 1, searches the access index table according to the home address of accessed mobile IP user, judge whether to exist the record of this mobile IP user, promptly whether have identical MS IP, if exist, execution in step 104, otherwise execution in step 105;
HA according to the home address of accessed mobile IP user one by one with the access index table in record compare, judge whether the record that exists home address identical, the accessed mistake of this user to be described if find the home address unanimity, enter step 104; If the MS IP in access index data structure does not match, then according to the content of the Point 3 in this access index data structure, seek the next user's of identical hash index the access index data structure that has, proceed comparison, by that analogy, behind the access index table of having searched all users with identical hash index, be point 3 when empty, do not find the record that is complementary with accessed mobile IP user yet, illustrate that then this user is for the first time accessed, then execution in step 105.
Step 105 is applied for two segment data districts, and the one piece of data district is as accessed information table, writes accessed information with the form of Fig. 3, and " Next " in this data field is changed to sky; Another segment data district is as the access index table, form with Fig. 2 is inserted corresponding information: wherein " MS IP " is accessed mobile IP user home address, " Point 2 " deposit the address of the visit information data field of application, former " Point 1 " value in the hash table is write in " Point 3 ", address with the access index data field writes in " Point 1 " of hash table at last, finishes.
When the mobile IP user of off line was reached the standard grade once more, it is online that HA detects this user, then sends a notification message to this user, and all the accessed information copy of this user that are kept in the buffer memory are sent to the user in IP datagram literary composition data.After sending successfully, delete the accessed information of user of preserving in the buffer memory, and delete the information of this user in the hash table.If send failure, then continue in buffer memory, to preserve this user's accessed information.Aforementioned notification message uses connection-oriented mode.And notification message uses Transmission Control Protocol.
The present invention is changing existing mobile IP service system and is influencing under the minimum situation, realized the function of the accessed details of mobile IP user under the buffer memory off-line state in HA, make that mobile IP user can be when online once more, obtain the accessed information of missing under the off-line state from HA.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
For example, when notifying user's information off-line, except by sending redirected chained address to this user the notification message, promptly issue network address of user, the user enters a deferred information webpage by clicking network address.
For example, in other embodiments, if use an input to have only the hashing of unique output, so just can reduce by a table, but computation complexity can increase, and concordance list needs dynamically application internal memory.
For example, in the visit information table, also can not adopt the chain sheet form, and directly all addresses of accessed information all are kept in the access index table.The visit information table can have a plurality ofly also can only preserve one, for example only preserves the last accessed information.For the access index table, also can not adopt the chain sheet form, but these address informations all are kept in the hash table.
Claims (9)
1. the implementation method of a mobile IP user notification service is characterized in that,
When mobile IP user was in off-line state, local agent HA preserved other-end or main frame mails to this user's data message; When the user was online once more, HA informed its information accessed when off-line state of this user, wherein:
HA sets up concordance list and accessed information table, determines accessed off-line mobile IP user by this concordance list is unique, and the accessed information table address of described mobile IP user correspondence;
When HA preserves accessed information, accessed information is saved in the accessed information table, and sets up the incidence relation of this accessed information table and described accessed off-line mobile IP user;
When HA reads accessed information, search described concordance list according to the user ID of described accessed off-line mobile IP user and obtain accessed information table address, and then obtain accessed information.
2. the method for claim 1 is characterized in that, described method further comprises:
When HA receives the data message that mails to registered mobile IP user, whether detect this user earlier online, if it is online, then this data message is sent to described mobile IP user, if this user is off-line, then preserve accessed information, when this mobile IP user was reached the standard grade, the accessed message of this user that HA will preserve sent to this user.
3. the method for claim 1 is characterized in that,
Described concordance list comprises Hash table and access index table, the access index table of corresponding one a group of mobile IP user of Hash table, wherein:
Hash table is used to store the hash index access index table address corresponding with it;
The access index table, the access index that is used to store each mobile IP user, the address of unique its accessed information table of indication of the access index of each mobile IP user with identical hash index;
Described by the unique definite accessed off-line mobile IP user of this concordance list, and the accessed information table address of described mobile IP user correspondence is meant: find the access index table by Hash table, find accessed information table by the access index table again.
4. method as claimed in claim 3 is characterized in that, described HA preserves accessed information and further may further comprise the steps:
(a) after HA receives the data message of visit off-line mobile IP user, use hash algorithm to calculate and obtain hash index Index according to this accessed user's user ID;
(b) in Hash table, seek the access index table corresponding with this Index according to Index, if find, execution in step (c), if do not find, execution in step (e);
(c) in the access index table corresponding, search the visit information record that judges whether to exist described mobile IP user correspondence according to the user ID of accessed mobile IP user, if having execution in step (d), otherwise execution in step (e) with Index;
(d) newly-built one accessed information table writes accessed information, and preserves described accessed information table address in described access index table, finishes;
(e) newly-built one accessed information table writes accessed information; A newly-built access index table, the address of wherein preserving the user ID of the accessed mobile IP user visit information table corresponding with it, and in Hash table, preserve the corresponding relation of described access index table and Index, end.
5. method as claimed in claim 4 is characterized in that,
Comprise hash index and access index table address in the described Hash table, wherein:
Hash index Index uses the hexadecimal home address of mobile IP user to calculate by HA;
The access index table address, the access index of first mobile IP user that is used for storing the Index correspondence is in the address of buffer memory;
Described access index table, be used to store the access index of each mobile IP user with identical hash index, the data field of the accessed information of mobile IP user of the unique indication of the access index of each mobile IP user, comprise: off-line mobile IP user home address, at the accessed information table address of this mobile IP user, and next access index address data area with mobile IP user of identical hash index.
6. as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that,
Described accessed information table is used to store the accessed information of off-line mobile IP user, comprising:
The source information of calling party: the information of the mobile IP user that sends datagram to the off-line mobile IP user;
Timestamp: HA receives the time of this data message;
Data: access originator is to the content of the data message of this mobile IP user transmission.
7. method as claimed in claim 6 is characterized in that, also comprises in the described accessed information table:
Length: access originator is to the length of the data message of mobile IP user transmission;
The next accessed information of this mobile IP user: the address of depositing the next accessed information of this user place.
8. as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that the accessed message of this user that described HA will preserve sends to this user one of in the following ways:
Send a notification message to this user, the information reproduction that this user who preserves is accessed sends to the user in IP datagram literary composition data;
Send redirected chained address to this user, the user is by clicking this address, the accessed information when obtaining off-line.
9. as the described method of arbitrary claim in the claim 1 to 4, it is characterized in that described user ID is the home address of mobile IP user.
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| CN2008100041097A CN101242357B (en) | 2008-01-17 | 2008-01-17 | A realization method for mobile IP user notification service |
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| CN103297402A (en) * | 2012-03-01 | 2013-09-11 | 腾讯科技（深圳）有限公司 | Method and system for controlling account registration |
| CN103731396B (en) * | 2012-10-10 | 2018-03-23 | 中国移动通信集团江西有限公司 | Resource access method, system and cache resources information push-delivery apparatus |
| CN103281249B (en) * | 2013-04-27 | 2016-06-15 | 中国科学院计算技术研究所 | A kind of service-oriented distinguishes the management method of mobile and system that optimize |
| CN103501351A (en) * | 2013-10-22 | 2014-01-08 | 广东睿江科技有限公司 | Monitoring method and monitoring device of network export |
| CN103631959A (en) * | 2013-12-17 | 2014-03-12 | 江苏名通信息科技有限公司 | Method for supporting million user data sub-meter based on Hash algorithm |
| CN112559219A (en) * | 2020-12-22 | 2021-03-26 | 广州技象科技有限公司 | Internet of things offline message management method, device, equipment and storage medium |
| CN112559220A (en) * | 2020-12-22 | 2021-03-26 | 广州技象科技有限公司 | Internet of things offline message sending method, device, equipment and storage medium |
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