CN101207579B - Server for implementing network note service and communication method among client machines - Google Patents
Server for implementing network note service and communication method among client machines Download PDFInfo
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- CN101207579B CN101207579B CN2007100757628A CN200710075762A CN101207579B CN 101207579 B CN101207579 B CN 101207579B CN 2007100757628 A CN2007100757628 A CN 2007100757628A CN 200710075762 A CN200710075762 A CN 200710075762A CN 101207579 B CN101207579 B CN 101207579B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
Abstract
The invention discloses a method which realizes the communication between a server and a client server in the network short message service. A NSM server receives the login of the client server, which declares the own user name and the acceptable information title when logging in. Other application programs can send out information to the NSM server, and the information indicts the receiver and the title. The NSM server can instantly transmit the information to the proper client server. When the NSM server transmits the information, the network protocol packet source address of the information, which is obtained from the network transmission protocol, is attached. Different titles represent different applications, and the NSM server can serve for the different applications at the same time. Adopting the NSM server of the invention can realize the direct communication (P2P) among the client servers. The both parties of the communication do not need other facilities and processes which are specially used to build the P2P, and the both parties of the communication also do not need to care the network addresses thereof, thereby dispensing with the course to inquire a third party the network address of the own party or the opposite party. The communication process is simple and effective.
Description
Technical field
The present invention relates to a kind of server of realizing network and short message (NSM Network Short Message) service, particularly relate to a kind of server of transmission network note in real time.The invention still further relates to a kind of communication method among client of short message server Network Based, can realize the direct communication of client computer, be also referred to as Peer-to-Peer (P2P) communication by the network and short message server.
Background technology
The NSM service is that a kind of general network information is transmitted service in real time, utilizes it can realize instant messaging (IM), the networking telephone (VOIP).Under many circumstances, can realize direct communication between the NSM client computer, be also referred to as Peer-to-Peer (P2P) communication.
The service of transmitting of existing internet instant messages is a kind of very common service, but these services are a kind of application service only usually, how to allow forwarding server simultaneously for multiple application service, has thousand and one way.Modal way is to shunt at client-side, and this way needs client-side that a communication house steward is arranged, and provides communication to divide stream interface by it.But this method need same user name all use all in same computing equipment, and this way also is inconvenient for Embedded Application.
In addition, the existing P2P of foundation communication modes mainly contains following three kinds of processing modes:
1. disclosed a kind of implementation of address server among the United States Patent (USP) 6108704 Point-to-Point Internet Protocol, its implementation is that client computer is all logined to address server, information such as the IP address of preservation client computer and presence in the address server.When needs when certain client computer sends information, earlier to address server query aim client state, address server is initiated P2P to Destination client then to the IP address and the presence information of its feedback target client computer.This patent mainly comprises two technical essentials: the one, set up address server, and the 2nd, give the inquiry by address server feedback target client address information, so that allow the inquiry initiate P2P to the Destination client address.Wherein address server only is responsible for the address information service of client computer, does not have the function of forwarding information.When Destination client is in private network, be difficult to set up the P2P communication.
2. disclosed the communication modes of another kind of realization P2P among the U.S. Pat 7227864 Methods and systems for establishingcommunications through firewalls and network address translators.Client computer to the central server login, is transmitted the P2P communication request by central server earlier then, and initiates P2P by the client computer that receives request.In the time can't successfully setting up P2P, obtain the other side's address information by other modes, and then initiate P2P.The central server of this patent only is used for assisting to set up P2P, for example transmits the P2P communication request, and does not transmit other data.If do not set up P2P, communication needs other forwarding server between the client.Client computer that this patent does not disclose the request of receiving is the network address that how to obtain transmit leg, so that initiate P2P.Learn also that from the process that this patent is described the initiator need be from third party's (for example central server) inquiry the other side's address, so that directly initiate P2P.
3. also disclosed the mode that realizes the P2P communication in the method and apparatus of a Chinese patent application CN 1881916A realization communication between communication apparatus, its implementation is: connection side's client computer determines that earlier it participates in the address (public network address or private net address) of P2P communication, and this address and P2P connection request sent to central server together, central server is transmitted above information to the side's of being connected client computer, initiates P2P by the side's of being connected client computer.From describing, this patent knows that the connection side in private network if the public network address of oneself is carried in this request, must inquire about the public network address of oneself from third party (for example central server) before sending the P2P connection request.
More than 3 kinds of P2P implementations, first method is simple to operate, Yi Bian but can only be from initiating the P2P communication.Because the existence of private network, its chance of successfully setting up P2P is few.Latter two patents attempts to improve this problem, and from bilateral initiation P2P communication, opportunity of success increases many.But they obtain and transmission is own and the process more complicated of partner address.In addition, should directly send just more likely success of information to which type of address of the other side, above these patented methods provide is not optimum answer.The success rate that they set up P2P is still not enough.
Summary of the invention
One of technical problem that the present invention solves is to have proposed a kind ofly can be the network and short message server of multiple application service.
The server of the realization network and short message service that the present invention proposes, described network and short message server is used to receive the logging request from client computer, and this logging request comprises at least: user name, authentication information, one or more receivable message header, the login term of validity;
Described network and short message server is used for obtaining the procotol bag source address of logging request as this client network address from the network transmission protocol;
Described network and short message server is used to check the logging request of client computer, if the verification passes, described this client recording of network and short message server constructs, this record comprises at least: the logging request of client computer and this client network address;
Described network and short message server also is used to receive the information from other application program, and this information comprises at least: one or more recipient's user names, one or more message header, the information content;
Described network and short message server is used for obtaining from the network transmission protocol procotol bag source address of reception information, and with its sender address as this information;
Described network and short message server is used for the sender address of the prime information that receives and this prime information is merged the structure fresh information, be transmitted to the client computer that meets following condition: comprise the user name of this client computer in the middle of recipient's user name of prime information, and this client computer accessible information title comprises in the message header of prime information any one;
Described network and short message server forwards fresh information is given when meeting the client computer of top condition, the destination address of the client network address in this client recording as the forwarding fresh information.
Preferably, described network and short message server receives the greeting information from client computer and other application program, and replys server time to it.
Preferably, described network and short message service also is used for having same username and an identical accessible information title client computer to a plurality of, only preserves the client recording of last logging request in these client computer.
Preferably, described network and short message server is used to receive only the request of the client logon of an accessible information title; Recipient's title is only arranged in the information of described network and short message server forwards and a message header is only arranged.
Adopt network and short message server of the present invention, owing to shunt with regard to support information at server, this realizes by using the NSM message header.Different application can be used different titles.This is a very simple but effective processing mode.
Server of the present invention in addition obtains the procotol bag source address of forwarding information by the bottom host-host protocol, is transmitted to the recipient as this information transmitter network address.After the recipient obtains this address, directly send information to this address and most possibly received by the other side.With the ICP/IP protocol is example, the present invention just machinery (from but simple) from ICP/IP protocol, take out the IP bag source address of information.No matter the sender is on the public network or in private network.If transmit leg is in private network, this source address of taking out not is real sender address.Real sender address is no advantage on the contrary for setting up P2P, unless communication two party is in same office net.
Two of the technical problem that the present invention solves is the communication method among client that proposed a kind of short message server Network Based, the sender address that adds when utilizing NSM server forwards information.Attempt the direct communication of P2P.
The communication method among client of the short message server Network Based that the present invention proposes, described network and short message server refers to meet claim 4 or 5 described servers, comprises following processing procedure:
A) the network and short message server of communication two party client computer under separately sends logging request, and this logging request comprises at least: user name, authentication information, receivable message header, the login term of validity; Can know network and short message server address under this client computer from client network short-message users name;
B) the communication two party client computer comprises the other side's user name, receivable message header, the user name of oneself and the information content by the network and short message server forwards information under the other side in the information;
C) after the other side's information that the network and short message server forwards under client computer receives oneself is come, obtained the other side's user name, this information transmitter address that adds when also having the network and short message server forwards is recorded as the other side's direct address with this information transmitter address;
When once more when the other side sends fresh information, the network and short message server forwards fresh information under passing through the other side, also to the identical fresh information of the other side's direct address transmission;
D) send mutually in the process of information both sides, if a certain side has received the information that the other side directly sends, then P2P sets up, and afterwards by the P2P communication, no longer passes through the other side's network and short message server forwards information; Still can not set up P2P if repeatedly send information mutually, then abandon directly sending information, only pass through the other side's network and short message server forwards information.
Adopt communication method among client of the present invention, the NSM server has been told the recipient TCP/IP host-host protocol IP of the forwarding information that receives bag source address as sender address.Imagine, if the NSM server is pressed this address to the anti-carry information of sender, the sender necessarily can receive.So, change into by the recipient by this address, also most possibly be received to sender's loopback information.And the benefit of utilizing NSM to set up P2P is that also communication two party does not need the special in setting up facility (as central server) and the process that P2P uses of other.Communication two party does not need to be concerned about the network address of oneself yet.The process that does not have inquiry oneself or bipartite network address.Communication two party normally utilizes NSM service forwarding information, attempts setting up P2P simultaneously.If do not set up P2P, do not influence the indirect communication of serving forwarding information normally by NSM.
Description of drawings
Fig. 1 is that client computer of the present invention is to network and short message server log schematic diagram;
Fig. 2 is that network and short message server of the present invention is to client computer forwarding information schematic diagram;
Fig. 3 is the communication method among client schematic diagram that the present invention is based on the network and short message server.
Embodiment
The note that at first need to prove the short message service that network and short message among the present invention and communication terminal use is not a notion, and network and short message of the present invention can be thought a short and small imformosome, passes through Network Transmission.The network address of mentioning among the present invention is specially for the TCP/IP network: IP:PORT.
Below by specific embodiment network and short message server of the present invention is elaborated.Describe for convenient, describe execution mode with the UDP communication of TCP/IP below.
Suppose that client-server all is the computing unit in the TCP/IP network.Client computer can directly hang on the public network, also can hang on the private network and by router to connect public network or upper strata private network.When the client computer in the private network externally sent information, the NAT of router changed the IP bag source address of this information.
The service that provides of active/standby server can be provided in a reliable system, also can adopt the mode of Single-Server for simple system.Master server is the same with the backup server function, just its network address (IP:PORT) difference.
Each user has a user's name, and the form of this title is in the present embodiment:＜userid〉@＜domain name or IP, for example: yanghm@12.34.56.78 or
13902904910@headcall.comUser name is also referred to as NSM user name and user's NSM address.Can discern its server address by the NSM user's name, for example the server address of 13902904910@headcall.com is: nsm.headcall.com (master server) and nsm2.headcall.com (backup server).Client computer is a computing unit.It uses a NSM user name and receivable message header.The shape of message header such as abc or 123 or abc8.headcall.com.Different application programs is used different message headers, and server just can be served for different application simultaneously like this.For example iphone.headcall.com is the title that the headcall networking telephone uses, and ichat.headcall.com is the title that certain instant message software uses.
The login process that client computer is as shown in Figure 1 carried out to server.Client computer comprises in the logging request that server sends: user's name, authenticated data, message header, the login term of validity (being survival period).Client computer should send new logging request in this logins survival period, so that allow server keep the presence of this client computer.
After server receives logging request, from the bottom-layer network host-host protocol, obtain the IP bag source address (IP:PORT) of this logging request, as this client network address.
If this logging request is by checking, then client recording of server constructs writes down the logging request of this client computer, the network address of client computer.
When this client computer was in private network, the client network address that is recorded not was real client network address, but through the network address after the NAT conversion.But server only need write down the network address after this conversion, does not need real client network address.
If logging request is by checking, server returns login to client computer and confirms.Otherwise, return the reason of login failure.For example: user error, authentication error, perhaps this user (interim or permanent) transfer.Utilize interim transfer characteristic, can also construct server cluster.The authentication mode of login is supported ordinary authentication (being the password plain code), also supports SHA (password plain code+challenge code) authentication, and other authentication mode.If authentification failure can be told the authentication mode of client computer except that ordinary authentication and the challenge code that needs in the return information.Challenge code produces at random, and the NSM server can change challenge code at any time.Client computer recomputates authentication information after receiving the message of authentication error, sends logging request once more.If server is configured to restriction and uses some title, so, the reason of client logon failure also comprises header error.
In addition, for by a plurality of client computer when server requests login has the user of same username and identical accessible information title, server is only preserved the client recording of last logging request in these client computer, and client recording before will be dropped.
The client computer on the left side is the client computer 201 in the private network 101 among Fig. 1, and that be recorded during its login is not its native network address 601:192168.0.12:1089, but through the source network address 602:202.96.56.78:65321 after NAT 102 conversions.The relevant information that comprises client computer in the logging request 701: this user's title
Yanghm@one.com, these user's corresponding server 301 addresses are that (if backup server is arranged, this backup server address is nsm.one.com: nsm2.one.com) as can be seen.When login client computer 201 be that the server of nsm.one.com (simultaneously to nsm2.one.com, if present) is logined to the address.The message header of this client computer support is: yanghm.xyz.com.The TCP/IP host-host protocol will add the IP header to logging request 701 packages, contain destination address (address of server 301), source address 601 etc., and package is 401 as a result, sends to server 301.Package 401 is routed to the private network outlet, needs through NAT102, and this NAT has the IP address 203.34.56.78 of public network 100.The source address 601 that transducer NAT102 will change in the package is transformed into 602, and package 401 has become 402, and logging request 701 does not wherein change.Server 301 receives 402 packages, therefrom takes out log-on message 701, and obtains IP bag source address 602 from the TCP/IP host-host protocol.If logging request 701 is by check, then server 301 is preserved this log-on message 701, deposits source address 602 during with the guarantor, and keeping records is 501.
The client computer 203 on the right is for hanging over the client computer of public network 100 among Fig. 1, and the network address 603 of its login is: 202.96.56.78.2078 shows in the logging request 703 that client name is called:
John@one.com, the message header of support is: headcall.one.com.The TCP/IP host-host protocol will add the IP header to logging request 703 packages, contain destination address (address of server 301), source address 603 etc., and package is 403 as a result, is sent to server 301.Server 301 receives 403 packages, therefrom takes out log-on message 703, and obtains IP bag source address 603 from the TCP/IP host-host protocol.If logging request 703 is by check, then server 301 is preserved this logging request 703, deposits source address 603 during with the guarantor, and keeping records is 503.
With reference now to pictorial image 2, illustrates that the NSM server is a forwarding information how.Other application program 801 is passed through NSM server 301 to client computer 201 transmission information 802.Application program 801 is at first made NSM form package 805, and it contains head 803 (recipient's title, message header) and information 802.The TCP/IP host-host protocol will add the IP header to information 805 packages, contain destination address (address of server 301), source address 804 etc., and package is 806, is sent to server 301 through public network 100.NSM server 301 receives 806 packages, therefrom takes out NSM form package 805, finds the log-on message 501 of corresponding client computer by head 803 indications.In addition, NSM server 301 also obtains IP bag source address 804 from the TCP/IP host-host protocol.NSM server 301 will add in the head 803 source address 804 as sender address 904, constitutes new head 903 and new package 905.NSM server 301 hands over the TCP/IP host-host protocol to send to the client address 908 of 501 records this package 905 then.TCP/IP will add the IP header to 905 packages, contain destination address 908, source address (address of server 301) etc., and package is 906.IP bag 906 is sent to NAT 102, and NAT can correctly transfer to client computer 201 to this bag by private network 101.
NSM server 301 is when receiving information, and to be indifferent to the sender be on public network as 801, still in private network as client computer 809.The IP bag source address that obtains received information from the TCP/IP host-host protocol of NSM server meeting machinery is as its sender network address.
NSM server 301 also is indifferent to the recipient and is on public network as client computer 203 when forwarding information, still in private network as client computer 201.Do not need to know this machine address of recipient yet.It is the destination address of taking out forwarding from log-on message of meeting machinery only, carries out the forwarding of information.
If client computer is not online or other reason causes the NSM server successfully not transmit, the NSM server replys the reason of retransmission failure for the sender network address.This answer is received certainly.
The NSM server also receives the greeting information from client computer and other application program in addition, and replys server time to it.
Use for the P2P based on the NSM server, the NSM server receives the client logon request that an accessible information title is only arranged; And recipient's title is only arranged in the information of NSM server forwards and a message header is only arranged.
How to finish communication process by the NSM server below by two NSM client computer, the communication method among client that the present invention is proposed is elaborated.With reference to shown in Figure 3.
The client computer B of server NSM_B, it will at first initiate the communication to the client computer A of server NSM_A.Need to prove that the NSM_A here may be same server with NSM_B, also can be different servers.Communication comprises following process:
1) client computer A, B at first will be to server (NSM_A, NSM_B) logins separately.
2) client computer B sends information 01 to server NSM_A, and this information comprises the user name of recipient A, message header, the user name of oneself and the information content etc.
3) during server NSM_A forwarding information 01, added the IP bag source address of this information 01 that from ICP/IP protocol, obtains, it joined in the information 01 as the sender address that new information is sent to client computer A.
4) after client computer A receives new information in the step 3), therefrom obtain the NSM user name of client computer B, also obtained this information transmitter address simultaneously.This information transmitter address is recorded as the direct address of client computer B.
5) client computer A continues to transmit this information by server NSM_B when client computer B sends information 02, and the direct address to client computer B sends and the identical information 02P of information 02 content simultaneously.
6) if client computer B has received information 02P, client B knows that direct communication P2P sets up so.Just can adopt P2P to send when sending the content of information 03 again, promptly information 03P has not needed through server NSM_A forwarding information 03.When client computer A receives directly information 03P from client computer B, know that direct communication P2P sets up, just can send by P2P when sending information again, do not need to pass through the NSM server forwards.
7) if client computer B does not receive information 02P, but be certain to receive information 02, client computer B has also obtained this information transmitter address so.This information transmitter address is recorded as the direct address of A.
8) client computer B continues to transmit this information 03 by server NSM_A when client computer A sends information 03, and the direct address to client computer A sends identical information 03P simultaneously.
9) if client computer A has received information 03P, client computer A knows that direct communication P2P sets up so.Just can send by P2P when sending information again, do not needed through NSM server forwards information.When client computer B receives directly information from client computer A, know that direct communication P2P sets up.
10) if client computer A does not receive information 03P.But both sides have known the other side's direct address now, when the information of transmission, by the other side NSM server forwards information, send identical information to the other side's direct address simultaneously.In case set up the P2P communication, then no longer pass through the other side's NSM server forwards information.Still can not set up P2P if repeatedly send information mutually, then abandon directly sending information, only pass through the other side's NSM server forwards information.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a server of realizing the network and short message service below is referred to as the network and short message server, it is characterized in that,
Described network and short message server is used to receive the logging request from client computer, and this logging request comprises at least: user name, authentication information, one or more receivable message header, the login term of validity;
Described network and short message server is used for obtaining the procotol bag source address of this logging request as this client network address from the network transmission protocol;
Described network and short message server is used to check the logging request of client computer, if the verification passes, described this client recording of network and short message server constructs, this record comprises at least: the logging request of client computer and this client network address;
Described network and short message server also is used to receive the information from other application program, and this information comprises at least: one or more recipient's user names, one or more message header, the information content;
Described network and short message server is used for obtaining from the network transmission protocol procotol bag source address of reception information, and with its sender address as this information;
Described network and short message server is used for the sender address of the prime information that receives and this prime information is merged the structure fresh information, be transmitted to the client computer that meets following condition: comprise the user name in the logging request of this client computer in the middle of recipient's user name of prime information, and the accessible information title in the logging request of this client computer comprises in the message header of prime information any one;
Described network and short message server forwards fresh information is given when meeting the client computer of top condition, the destination address of the client network address in this client recording as the forwarding fresh information.
2. the server of realization network and short message service according to claim 1 is characterized in that described network and short message server receives the greeting information from client computer and other application program, and replys server time to it.
3. the server of realization network and short message service according to claim 1 and 2, it is characterized in that, described network and short message server also is used for the client computer that has same username and identical accessible information title to a plurality of, only preserves the client recording of last logging request in these client computer.
4. the server of realization network and short message service according to claim 1 and 2 is characterized in that described network and short message server is used to receive only the request of the client logon of an accessible information title; Recipient's title is only arranged in the information of described network and short message server forwards and a message header is only arranged.
5. the server of realization network and short message service according to claim 3 is characterized in that described network and short message server is used to receive only the request of the client logon of an accessible information title; Recipient's title is only arranged in the information of described network and short message server forwards and a message header is only arranged.
6. the communication method among client of a short message server Network Based, described network and short message server refers to meet claim 4 or 5 described servers, it is characterized in that described method comprises following processing procedure:
A) the network and short message server of communication two party client computer under separately sends logging request, and this logging request comprises at least: user name, authentication information, receivable message header, the login term of validity; Can know network and short message server address under this client computer from the network and short message user name of client computer;
B) the communication two party client computer comprises the other side's user name, receivable message header, the user name of oneself and the information content by the network and short message server forwards information under the other side in the information;
C) after the other side's information that the network and short message server forwards under client computer receives oneself is come, obtained the other side's user name, this information transmitter address that adds when also having the network and short message server forwards is recorded as the other side's direct address with this information transmitter address;
When once more when the other side sends fresh information, the network and short message server forwards fresh information under passing through the other side, also to the identical fresh information of the other side's direct address transmission;
D) send mutually in the process of information both sides, if a certain side has received the information that the other side directly sends, then P2P sets up, and afterwards by the P2P communication, no longer passes through the other side's network and short message server forwards information; Still can not set up P2P if repeatedly send information mutually, then abandon directly sending information, only pass through the other side's network and short message server forwards information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100757628A CN101207579B (en) | 2007-08-15 | 2007-08-15 | Server for implementing network note service and communication method among client machines |
| PCT/CN2008/001447 WO2009024020A1 (en) | 2007-08-15 | 2008-08-11 | A server implementing network short message service and the communication method between the server and the clients |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100757628A CN101207579B (en) | 2007-08-15 | 2007-08-15 | Server for implementing network note service and communication method among client machines |
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| CN101207579A CN101207579A (en) | 2008-06-25 |
| CN101207579B true CN101207579B (en) | 2010-08-18 |
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| CN2007100757628A Expired - Fee Related CN101207579B (en) | 2007-08-15 | 2007-08-15 | Server for implementing network note service and communication method among client machines |
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| CN101207579B (en) * | 2007-08-15 | 2010-08-18 | 杨汉民 | Server for implementing network note service and communication method among client machines |
| CN103227746B (en) * | 2012-01-31 | 2018-03-27 | 珠海德百祺科技有限公司 | Data communications method and system |
| CN114302349B (en) * | 2021-12-07 | 2023-05-30 | 北京羽乐创新科技有限公司 | Method and system for extracting number by client |
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| JP2007124486A (en) * | 2005-10-31 | 2007-05-17 | Toshiba Corp | Communication control method |
| US20070147399A1 (en) * | 2005-11-15 | 2007-06-28 | Arcsoft (Shanghai) Technology Company, Ltd | Using Secondary Channels to Communicate IP Addresses for Point-To-Point Communication |
| CN101207579B (en) * | 2007-08-15 | 2010-08-18 | 杨汉民 | Server for implementing network note service and communication method among client machines |
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2008
- 2008-08-11 WO PCT/CN2008/001447 patent/WO2009024020A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1663291A (en) * | 2002-06-26 | 2005-08-31 | 阿尔卡特公司 | Method for providing services located in a connectionless data packet network to terminals of a connection oriented communications network |
| CN1918887A (en) * | 2004-02-20 | 2007-02-21 | 松下电器产业株式会社 | Method and system for proxy-based secure end-to-end tcp/ip communications |
| WO2006089593A1 (en) * | 2005-02-24 | 2006-08-31 | Siemens Enterprise Communications Gmbh & Co. Kg | Method for recording a voip communication using a peer-to-peer databank |
| CN1881916A (en) * | 2005-06-17 | 2006-12-20 | 腾讯科技（深圳）有限公司 | Method and apparatus for realizing communication between communication equipments |
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| WO2009024020A1 (en) | 2009-02-26 |
| CN101207579A (en) | 2008-06-25 |
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