CN102045796B - Mobile network system and mobile management method thereof - Google Patents
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Abstract
The invention provides a mobile network system, comprising an access gateway and mobile terminals, wherein each mobile terminal comprises a unique ID, and the mobile terminals are used for calling target terminals according to the ID of the target terminal. The access gateway comprises a position service module and a switching module, wherein the position service module is used for storing the corresponding relationships among the IDs and the IP addresses, and the switching module is used for providing switching services to the mobile terminal which is to be switched and is serviced by the switching module and the mobile terminal which is to be switched and is provided with the access gateway of the switching module as a target access gateway. The invention further provides a corresponding method of terminal call and mobile switch. The mobile network system and the mobile management method thereof provided by the invention have the advantages that the signalling cost is saved, the waste of mobile IP address is prevented, the time delay of switching is small and the resource which is occupied by bicast is less.
Description
Technical field
The present invention relates to core net and network management technology field, specifically, the present invention relates to a kind of mobile network system and management method of mobile thereof.
Background technology
Mobility Management Scheme mainly comprises two aspects, is respectively location management (location management) and handover management (handoffmanagement).Location management is to guarantee that network can find mobile terminal, and handover management is that the assurance session is not interrupted when because of fast mobile terminal, changing access point.In prior art, Mobility Management Scheme mainly contains network layer Mobility Management Scheme and application layer Mobility Management Scheme.Below introduce respectively this two schemes.
The network layer of mobile network system of being based on the network layer Mobility Management Scheme realizes, its Location Management Scheme comprises Mobile IP (Mobile IPv6, MIPv6) and the expansion, the handover management scheme comprises quick switching (the Fast Handovers for MIPv6 of Mobile IP, FMIPv6), hierarchy type Mobile IP (Hierarchical MIPv6, HMIPv6).The all realizations of the network architecture based on MIPv6 of above various scheme, the network architecture of MIPv6 as shown in Figure 1.In Fig. 1, MN is mobile terminal (mobile node), HA is home agent (home agent), CN is Correspondent Node (correspondent node), PAR is the couple in router (previous access router) before MN moves, NAR is that MN moves rear new couple in router (new access router), and PAR and NAR have the function of Foreign Agent (foreign agent (FA)).
Wherein, the function of HA is: as MN during in other places, set up the binding of home address and nonlocal relative address on HA for MN, when having packet to issue MN, this packet is issued the nonlocal relative address of MN in the mode in tunnel after being intercepted and captured by HA, so that this packet arrives in nonlocal MN.
The function of FA is: for MN distributes nonlocal relative address, and the message between relaying MN and HA (being packet).
In above-mentioned MIPv6 network system, be that MN distributes home address and nonlocal relative address by HA and FA, and realize the location management to MN by the two cooperation.But this scheme need to realize based on HA-FA two-tier network structure, and HA-FA network configuration level is many, and the network element number is many, is unfavorable for saving administration overhead and the cost of arranging net; Simultaneously the IP address should play a part as the sign of mobile terminal to realize the position of terminal on network topology again, makes in the situation that the burden weight of fast mobile terminal IP address underaction.
And, about the handover management aspect, the FMIPv6 of below take introduces a kind of typical switch managing method based on above-mentioned MIPv6 network system as example, when MN moves, as shown in Figure 3, this switch managing method comprises the following steps:
1) after the link layer of MN detects the movement of MN, send out to trigger (trigger) message to network layer to start fast handover procedures.
2) AR of MN and current use exchange Router Solicitation for Proxy (RtSolPr) and Proxy Router Advertisement (PrRtAdv) message obtain the information of NAR, and (relative address is nonlocal relative address here to obtain a relative address in the NAR territory, hereinafter repeat no more), be called new relative address (new Care-ofaddress, NCoA).
3) MN send Fast Binding Update (FBU) message to PAR old relative address (previous Care-of address, PCoA, relative address in the PAR territory) associate with NCoA, by Handover Initiate (HI) and HandoverAcknowledgment (HAck) message, set up a bidirectional tunnel between PAR and NAR.
4) PAR issues NAR to the packet of issuing MN by the path of just now setting up and carries out buffer memory.
5) MN sends RS (Router Solicitation) message to NAR.FastNeighbor Advertisement (FNA) option is set in RS message.When the RS message that the MN received as NAR sends contains Fast Neighbor Advertisement (FNA) option, NAR judges that described MN has appeared on new link, and NAR issues MN to the data of this MN of buffer memory.
6) MN sends the new relative address of oneself to HA, and the relative address of this MN that then HA records it is updated to described new relative address.
7) MN sends the new relative address of oneself to CN, and the relative address of this MN that then CN records it is updated to described new relative address.
Therefore the defect of this changing method comprises: 1, due to handoff procedure, need the participation of HA, increased the signaling consumption between each equipment and HA, when the Foreign Agent under MN and its home agent, when distant, this extra signaling consumption is especially obvious.2, the IP address had not only been served as identity ID but also had been served as the effect of home address, and over-burden, and when moving to other places, IP address, local has just lost the effect as address, and this has just caused extra waste.3, handoff delay is large.
In addition, also have a kind of application layer Mobility Management Scheme in prior art, Typical Representative is to realize the Mobility Management Scheme of application layer with sessioninitial protocol (SIP).In this scheme, each SIP client has a URL, and Session Initiation Protocol is supported the switching in conversation procedure.When sip user moves, the INVITE that sends to Correspondent Node the conversation description that includes new IP address by the SIP mobile client has asked the switching in session.Adopt bi-casting (bicasting) mechanism in switching, the Correspondent Node while is given out a contract for a project to two the related IP addresses of described mobile client in handoff procedure.Can find out, it is end to end that the data of this bi-casting mechanism send, while being a packet of Correspondent Node transmission, this packet will be distinguished routing forwarding to two related IP addresses of described mobile client from the IP address of Correspondent Node, so its network overhead is very large.
Summary of the invention
An object of the present invention is to provide a kind of that can support mobile management and the network element number is few, be beneficial to the mobile network system of saving administration overhead and the cost of arranging net.
Another object of the present invention is to provide a kind of terminal call method based on above-mentioned mobile network system.
The 3rd purpose of the present invention is to provide a kind of fast mobile terminal changing method based on above-mentioned mobile network system.
For realizing above-mentioned first goal of the invention, the invention provides a kind of flat mobile network system, comprise IAD and mobile terminal, each described mobile terminal has a unique ID, described mobile terminal is for calling out described target terminal according to the ID of target terminal, described IAD comprises location-based service module and handover module, and described location-based service module is used for storing the corresponding relation of each ID and IP address, and this corresponding relation is offered to the mobile terminal needed, the to be switched mobile terminal that described handover module is used to its affiliated IAD to serve provides handed over service, this handed over service comprises determines the target access gateway that will switch, for described to be switched mobile terminal forwards new IP address, and the former IP address of regaining described to be switched mobile terminal, described handover module also is used to take the to be switched mobile terminal that IAD is target access gateway under it handed over service is provided, this handed over service is included as described to be switched mobile terminal and distributes new IP address, and upgrade the ID of described to be switched mobile terminal and the corresponding relation of IP address.
Wherein, described IAD also comprises the bi-casting module, at handoff procedure by the package forward of Correspondent Node to the He XinIP address, former IP address of to be switched mobile terminal.
For realizing above-mentioned second goal of the invention, the invention provides a kind of terminal call method based on above-mentioned flat mobile network system, the method comprises the following steps:
1) calling terminal according to target terminal ID the current IP address to the IAD request target terminal for the service of this calling terminal;
2) described IAD, according to current ID and IP corresponding relation, draws the current IP address of described target terminal and it is returned to described calling terminal;
3) calling terminal sends the request connected to the current IP address of described target terminal, and then sets up and take the connection that source ID and purpose ID be sign; Wherein source ID is the ID of calling terminal, and purpose ID is the ID of target terminal.
For realizing above-mentioned the 3rd goal of the invention, the present invention also provides a kind of fast mobile terminal changing method based on above-mentioned flat mobile network system, and the method comprises the following steps:
1) to be switched mobile terminal sends switching to its current service IAD and prepares message;
2) after the current service IAD receives that message is prepared in switching, determine that described to be switched mobile terminal will switch the target access gateway entered;
3) target access gateway is that described to be switched mobile terminal distributes new IP address;
4) target access gateway sends to the current service IAD by described new IP address;
5) the current service IAD sends to described to be switched mobile terminal by described new IP address;
6) described to be switched mobile terminal by access point by current service IAD converting into target IAD; Described to be switched mobile terminal becomes and switches mobile terminal;
7) the described mobile terminal that switched sends the new IP address of oneself to its Correspondent Node;
8) described Correspondent Node this to described new IP address transmission data newspaper.
Wherein, described step 1) in, ID and the current IP address that message is carried described to be switched mobile terminal prepared in described switching.
Wherein, described step 2) in, after also being included in definite target access gateway, current service IAD and target access gateway Interaction context.
Wherein, described step 5) in, after also comprising that described current service IAD is received described new IP address, start bi-casting; Described bi-casting is when described current service IAD receives the packet that purpose ID is described to be switched mobile terminal ID, and this packet is forwarded to described current IP address and Liang Ge address, new IP address.
Wherein, described step 5) or 7) in, also comprise ID and new IP address according to mobile terminal, the ID stored in the renewal IAD and the corresponding relation of IP address.
Wherein, described step 8) in, also comprise that target access gateway becomes new current service IAD when described target access gateway is received the packet of directly sending from described Correspondent Node, this new current service IAD sends the bi-casting close message to former current service IAD; Former current service stops bi-casting and reclaims and distribute to described all resources of having switched mobile terminal after receiving the bi-casting close message.
With respect to prior art, the present invention has following technique effect:
1, the present invention has saved the signaling consumption relevant to HA;
2, the present invention has avoided the waste of Mobile IP address;
3, handoff delay of the present invention is little;
4, to take resource few for bi-casting of the present invention.
The accompanying drawing explanation
Below, describe by reference to the accompanying drawings embodiments of the invention in detail, wherein:
Fig. 1 shows mobile IP network framework of the prior art;
Fig. 2 shows the Signalling exchange schematic diagram of the fast handover procedures of movement-based IP network in prior art;
Fig. 3 shows the mobile network system structural representation of one embodiment of the invention;
Fig. 4 shows the protocol hierarchy schematic diagram of the mobile network system of one embodiment of the invention;
Fig. 5 shows the high-level schematic functional block diagram of IAD of the present invention;
Fig. 6 shows the mobile terminal changing method Signalling exchange schematic diagram in one embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 4, according to one embodiment of present invention, whole mobile network system adopts IAD (access gateway, be abbreviated as AGW) one deck structure, and network side only has AGW network entity.The mobile network system of the present embodiment comprises IAD and terminal.
In this mobile network system, each terminal has a unique ID, and the IP address only shows the current residing network site of terminal.The protocol hierarchy structure of this mobile network system as shown in Figure 5, is compared with existing mobile network system, and the present embodiment, on transport layer, has increased session layer under application layer, effectively to manage the session under situation of movement.In the present embodiment, the foundation of session connection is identified by source ID, purpose ID, replaces the way identified by source IP address, purpose IP address in prior art, avoids in the situation that terminal location changes IP address to change and the problem brought.And, after the identity marked effect of IP address is transferred to ID, greatly saved mobile terminal to the taking of IP address, avoided the waste of IP address.
Each AGW comprises that the location-based service module stores the presently used IP couple of terminal of ID and this ID, and the location-based service module on these different AGW is with the mode networking of DHT, to complete storage and the inquiry that ID and IP are right.At present the method for DHT has a lot, such as the scheme that can adopt chord to encircle in the present embodiment (can reference: Hari Balakrishnan, M.Frans Kaashoek, David Karger,
Robert Morris, and Ion Stoica.
Looking up data in P2P systems.In
Communications of the ACM, February 2003.).When changing, the IP address of mobile terminal upgrades the corresponding relation of ID and IP to the location-based service module of AGW, to guarantee the accessibility of mobile terminal.AGW also comprises that handover module manages the relevant affairs of switching.In addition, AGW also comprises the bi-casting module, is used for realizing bi-casting mechanism.Here the bi-casting of mechanism refers to that AGW sends packet to two IP addresses before and after the switching of an ID simultaneously.The AGW high-level schematic functional block diagram as shown in Figure 5.
Below introduce calling based on above-mentioned mobile network system and the process of switching.
Calling procedure comprises the following steps:
1) when calling terminal is wanted the call targets terminal, to the current IP address (referred to as purpose IP address) of the corresponding target terminal of AGW request target Termination ID for this calling terminal service, the location-based service module in AGW returns to calling terminal by this Query Result (being the current IP address of target terminal).
2) calling terminal, in session layer, sends to purpose IP address the request connected, and sets up to take the connection that source ID and purpose ID be sign.Wherein source ID is the ID of calling terminal, and purpose ID is the ID of target terminal.
Fig. 6 shows the mobile terminal changing method Signalling exchange schematic diagram of the mobile network system based in the present embodiment, below sign implication in paper Fig. 6.
2 layers of triggering (L2trigger): the switching initiation message that link layer sends starts handoff procedure with the notice upper strata
Switching is prepared (Handoff preparation): MN to the Serving AGW (AGW served, be the current service IAD) send to switch and prepare message, started the switching preparation on Serving AGW, comprised and determine which AGW is target AGW
Determine target access gateway (Determine targetAGW): the AGW interactive information that ServingAGW is adjacent is determined target AGW
Context mutual (Context transfer): Serving AGW transmits authentication and some security strategy relevant to MN to target AGW
IP available (Available IP): the IP that target AGW will distribute to MN sends to Serving AGW, and Serving AGW further gives MN
Start bi-casting (Start bicasting): Serving AGW starts bicasting (bi-casting), to the packet of MN and target AGW transmission bicasting
Switch to new IAD (Handoff to newAGW): MN and carry out the actual switching to target AGW, disconnect and being connected of current Serving AGW, build on the connection of target AGW, after this target AGW becomes Serving AGW
(HandoffAck) confirmed in switching: the confirmation message of handover success
Update (ID, IP) pair representative: MN upgrades its new (ID, IP) mapping to the location-based service module on AGW
Upgrade and confirm (Update Ack): be updated successfully acknowledge message
Upgrade current IP (Update current IP): MN upgrades the variation of its IP address to CN
Send the new IP transmission packet of data (Send data to new IP): CN to MN to new IP
Stop bi-casting (Stop bicasting): the AGW be switched to stops bicasting message to AGW transmission before
Switched (Handoff complete): switched
With reference to figure 6, handoff procedure comprises the following steps:
1) when detecting, the link layer of mobile terminal enters when Zone switched, handover module to it sends trigger to start switching set-up procedure (handoff preparation phase), the handover module of mobile terminal sends switching to the AGW (Serving AGW) served for its and prepares message (Handoff preparation message), includes the ID of MN and the IP address of current use in this message.
2) Serving AGW receives after this message with neighbours AGW interactive information to determine the target AGW (Target AGW) that the MN of this ID will be switched to.Neighbours AGW transmits the signal strength signal intensity of the MN of this ID be subject to Serving AGW, selecting the strongest AGW of signal by Serving AGW contrast is target AGW.Determined Serving AGW and Target AGW Interaction context (context transfer) after target AGW, Target AGW returns and distributes to the IP address that the mobile terminal that will switch is used.
3) Serving AGW sends to mobile terminal by this IP address after receiving newly assigned IP address, start bi-casting (be transmitted on the one hand the current IP address of this ID when Serving AGW receives the packet of the ID that sends to mobile terminal, on the other hand this packet copied to portion and its purpose IP should be transmitted to Target AGW for newly assigned IP address) simultaneously.
4) mobile terminal selects switched suitable opportunity, and access point is transformed on Target AGW by Serving AGW.
5) mobile terminal upgrades the corresponding relation of its ID and IP to the location-based service module in AGW.
6) mobile terminal to Correspondent Node with new it new ID and the corresponding relation of IP.Receive this message, Correspondent Node will alter course on the new IP address of this ID and send packet.
7) when the AGW be switched to receives the packet of the packet directly sent from Correspondent Node rather than bi-casting to the AGW transmission bi-casting close message of service switching.
8) after receiving the bi-casting close message, the AGW before switching stops bi-casting, and reclaims all resources of distributing to this mobile terminal.So far switched.
It should be noted that the bicasting in the SIP scheme that the bicasting (bi-casting) in the present embodiment is different from.Bicasting packet in the SIP scheme is to be produced to first Packet Generation to the two IP address of latter two IP address before switching by the CN place, like this transmission of the packet of bi-casting from CN to MN whole piece path; The bi-casting packet of this paper produces on Serving AGW, is sent to two IP addresses of switching front and back by Serving AGW, and the transmission of bi-casting packet just only occurs over just between former and later two AGW of switching like this, has reduced the consumption of communication link.
And, because this enforcement does not need the participation of HA, so saved the signaling consumption relevant to HA.
Finally it should be noted that, above embodiment is only in order to technical scheme of the present invention to be described, and unrestricted.Although with reference to embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is modified or is equal to replacement, do not break away from the spirit and scope of technical scheme of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a mobile network system, comprise IAD and mobile terminal, and each described mobile terminal has a unique ID, described mobile terminal is for calling out described target terminal according to the ID of target terminal, described IAD comprises location-based service module and handover module, and described location-based service module is used for storing the corresponding relation of each ID and IP address, and this corresponding relation is offered to the mobile terminal needed, the to be switched mobile terminal that described handover module is used to its affiliated IAD to serve provides handed over service, this handed over service comprises determines the target access gateway that will switch, for described to be switched mobile terminal forwards new IP address, and the former IP address of regaining described to be switched mobile terminal, described handover module also provides handed over service for take the to be switched mobile terminal that IAD is target access gateway under it, this handed over service is included as described to be switched mobile terminal and distributes new IP address, and upgrade the ID of described to be switched mobile terminal and the corresponding relation of IP address.
2. mobile network system according to claim 1, is characterized in that, described IAD also comprises the bi-casting module, at handoff procedure by the package forward of Correspondent Node to the He XinIP address, former IP address of to be switched mobile terminal.
3. a terminal call method of utilizing mobile network system claimed in claim 1, the method comprises the following steps:
1) calling terminal according to target terminal ID the current IP address to the IAD request target terminal for the service of this calling terminal;
2) described IAD, according to current ID and IP corresponding relation, draws the current IP address of described target terminal and it is returned to described calling terminal;
3) calling terminal sends the request connected to the current IP address of described target terminal, and then sets up and take the connection that source ID and purpose ID be sign; Wherein source ID is the ID of calling terminal, and purpose ID is the ID of target terminal.
4. a fast mobile terminal changing method that utilizes mobile network system claimed in claim 1, the method comprises the following steps:
1) to be switched mobile terminal sends switching to its current service IAD and prepares message;
2) after the current service IAD receives that message is prepared in switching, determine that described to be switched mobile terminal will switch the target access gateway entered;
3) target access gateway is that described to be switched mobile terminal distributes new IP address;
4) target access gateway sends to the current service IAD by described new IP address;
5) the current service IAD sends to described to be switched mobile terminal by described new IP address;
6) described to be switched mobile terminal by access point by current service IAD converting into target IAD; Described to be switched mobile terminal becomes and switches mobile terminal;
7) the described mobile terminal that switched sends the new IP address of oneself to its Correspondent Node;
8) described Correspondent Node is to this described new IP address transmission data newspaper.
5. fast mobile terminal changing method according to claim 4, is characterized in that, in described step 1), ID and the current IP address that message is carried described to be switched mobile terminal prepared in described switching.
6. fast mobile terminal changing method according to claim 4, is characterized in that, described step 2) in, after also being included in definite target access gateway, current service IAD and target access gateway Interaction context.
7. fast mobile terminal changing method according to claim 4, is characterized in that, in described step 5), after also comprising that described current service IAD is received described new IP address, starts bi-casting; Described bi-casting is when described current service IAD receives the packet that purpose ID is described to be switched mobile terminal ID, and this packet is forwarded to described current IP address and Liang Ge address, new IP address.
8. fast mobile terminal changing method according to claim 4, is characterized in that, described step 5) or 7) in, also comprise ID and new IP address according to mobile terminal, the ID stored in the renewal IAD and the corresponding relation of IP address.
9. fast mobile terminal changing method according to claim 7, it is characterized in that, in described step 8), also comprise when described target access gateway is received the packet of directly sending from described Correspondent Node, target access gateway becomes new current service IAD, and this new current service IAD sends the bi-casting close message to former current service IAD; Former current service stops bi-casting and reclaims and distribute to described all resources of having switched mobile terminal after receiving the bi-casting close message.
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| CN103841610B (en) * | 2014-03-18 | 2017-02-15 | 山东大学 | Quick and efficient agent mobile IPv6 switching method |
| CN104980354B (en) * | 2015-06-26 | 2018-12-18 | 中国科学院大学 | Data transmission processing method and device |
| CN110379429B (en) * | 2019-07-16 | 2022-02-11 | 招联消费金融有限公司 | Voice processing method, device, computer equipment and storage medium |
| CN113992492B (en) * | 2021-12-28 | 2022-08-09 | 北京天维信通科技有限公司 | Management method for realizing single-address single-port connection based on extended TCP protocol |
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| CN101128013A (en) * | 2006-08-14 | 2008-02-20 | 华为技术有限公司 | A switching method for access gateway in mobile communication system |
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| EP2020783A1 (en) * | 2006-05-22 | 2009-02-04 | NEC Corporation | Mobile communication control system |
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| EP2020783A1 (en) * | 2006-05-22 | 2009-02-04 | NEC Corporation | Mobile communication control system |
| CN101111067A (en) * | 2006-07-21 | 2008-01-23 | 华为技术有限公司 | Mobile terminal and communication method for gateway access |
| CN101128013A (en) * | 2006-08-14 | 2008-02-20 | 华为技术有限公司 | A switching method for access gateway in mobile communication system |
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