CN103188752B - A kind of method for switching network of mobile terminal zero packet loss under novel routing architecture - Google Patents
A kind of method for switching network of mobile terminal zero packet loss under novel routing architecture Download PDFInfo
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Abstract
The invention discloses a kind of method for switching network of mobile terminal zero packet loss under novel routing architecture.Terminal detects when service quality drops to certain threshold value in movement, scanning periphery access point network obtains optimal access point NAR, then consult to obtain new Eloc address by PAR Yu NAR, by PAR, the packet that destination address is terminal Eloc is forwarded to NAR to cache after confirming switching, new Eloc address is notified that Correspondent Node terminal and local EMS Server are to update its<ID each stored by terminal subsequently, ELoc>mapping table, after terminal switches to new Eloc address, fetch the packet of caching to NAR, recover the proper communication with Correspondent Node terminal.The present invention is by the Eloc address of pre-acquiring networking waiting, it is to avoid handover delay, can be realized zero packet loss by the data cached bag of NAR, it is ensured that being normally carried out of communication before terminal switching.
Description
Technical field
The present invention relates to wireless access technology, particularly relate to a kind of mobile terminal zero packet loss under novel routing architecture
Method for switching network.
Background technology
Service for fixed terminal at the beginning of the Internet design, the most do not support that there is ambulant terminal.Interconnection
The IP address of net has identity and position dual identification: during as identity, and IP address is used for representing the body of main frame in network
Part, IP address is generally tied in application program by upper-layer protocol as identifier；During as station location marker, IP address is used for
The path that in route system, determination data bag forwards.
Along with the development of mechanics of communication, more and more there is ambulant terminal and can support internet, applications, when
User is when a subnet moves to another subnet, and its IP address can change, and the now change of station location marker causes body
The change of part mark, arises that the situation of communication disruption.
For problem above, state key project financing " Intrusion Detection based on host mark and the Next generation routing system of location addressing and reality
Check system " core net is separated with edge access network, the station location marker and the identity that construct a kind of terminal are separated
Novel road by system model, under this system, communication use identity, route use station location marker.
Fig. 1 is to use above-mentioned Novel road by the network topological diagram of system model.As figure, this system include a core net and
Several access networks, and add some new network entities on this basis, or legacy network entity is extended, tool
Body is described as follows:
(1) identity position mapping server EMS
Each access network arranges an EMS Server, for safeguarding identity and the position of every station terminal in present networks
Put mark, i.e.<ID, ELoc>mapping.
(2) dns server extended
The station location marker of the local EMS Server of access network belonging to the identity of responsible maintenance terminal and this terminal, i.e. <
ID, ELoc (EMS) > map.
(3) core network edge router PE
It is connected with access network edge router CE, is responsible for safeguarding that in present networks, the station location marker of terminal and core network are by marking
Know, i.e.<ELoc, core net Route Distinguisher RLoc>mapping, and the purpose ELoc address of packet is used core net Route Distinguisher
Rloc is packaged, and makes this packet to route in the core network.
(4) access network edge router CE
It is connected with core network edge router PE.
(5) border router RMS
Being responsible for the border router RMS with other access networks uses<ELoc, the RLoc>of the mutual the whole network of bgp protocol to map.
When data need this access network, RMS is needed to forward.
Each terminal storage has identity and the station location marker of Correspondent Node terminal, i.e.<ID, ELoc>to map.
Although the problem that this novel routing architecture solves IP address dual identification, it would be preferable to support the mobility of terminal, but
It is, when terminal moves to another subnet from a subnet, i.e. to disconnect and the connection of current Access Router PAR, and with newly
When the router NAR accessed connects, need the regular hour dynamically to obtain new Eloc address, during this period in, can cause
The interruption of communication.To avoid the problem of communication disruption, the packet mailing to this terminal when can terminal be switched is by routeing
Device temporary cache gets up, and is fetched by packet after terminal has switched again, but the time of terminal switching is but difficult to hold, and cuts
Changing and can cause data-bag lost too early and then cause the interruption of communication, switching the most then needs to cache substantial amounts of packet, volume
Add outward the cost of router.
Summary of the invention
In view of the above problems, it is an object of the invention to provide a kind of under novel routing architecture, when terminal connects in difference
Enter between network or when switching in net, it is possible to realize zero packet loss and the method for switching network of handover delay can be effectively reduced.
For achieving the above object, the present invention is by the following technical solutions:
A kind of method for switching network of mobile terminal zero packet loss under novel routing architecture, this routing architecture includes core net
With several access networks, each access network is provided with EMS Server, in EMS Server storage have every station terminal in present networks < ID,
ELoc>mapping table, in each terminal, storage has<ID, ELoc>mapping table of its Correspondent Node terminal, it is characterised in that the method bag
Include following steps:
1) monitor the service quality of link during terminal moves when dropping to certain threshold value, scanning periphery access point network with
Obtain the information of available access point, and therefrom select optimal access point as NAR, then initiate RSPReq request to its PAR,
PAR initiates HSCReq request to NAR, carries address information Eloc of this terminal in this HSCReq request；
2) NAR responds this HSCReq request, station location marker Eloc that this terminal distribution for be accessed is new and certain resource,
And the Eloc that this is new is returned to PAR, PAR further the Eloc that this is new is returned to this terminal, meanwhile, PAR self distributes use
In the resource of forwarding packet, the destination address of this packet is the Eloc of this terminal；
3) described terminal is to PAR transmission ACK to confirm switching, and hereafter, destination address is described terminal Eloc by PAR
Packet be forwarded to NAR；
4) described terminal switches over, and the station location marker configuring self is described new Eloc；
5) described terminal sends HGPReq request to NAR, and the destination address fetching NAR caching with request is described terminal
The packet of Eloc；
6) described terminal sends ACReq request to its Correspondent Node terminal, informs its Eloc address change；
7) this Correspondent Node terminal returns to described terminal and confirms response；
8) this Correspondent Node terminal updates<ID, ELoc>mapping table of its Correspondent Node terminal stored；Follow-up mail to institute
The packet stating terminal sends to described new Eloc address.
Further:
Described step 6) before also include this step:
Described terminal sends to its local EMS Server and carries the more newly requested of described new Eloc address, this local EMS
Server responds this request, updates<ID, ELoc>mapping relations of described terminal.
Described step 6) the most further comprising the steps of:
A, described Correspondent Node terminal initiate Eloc_lookup_Request request to described EMS Server, to pacify
Full checking；
<ID, ELoc>mapping relations of described terminal after the inquiry renewal of B, described EMS Server, return result to institute
State Correspondent Node terminal.
Described step 8) also include afterwards:
9) described terminal sends a request for PAR to PAR and discharges described for forwarding the resource of packet；
10) PAR responds the request of described terminal, discharges the resource for forwarding packet.
The information of described available access point includes service set, qos parameter, ELoc address.
Described optimal access point is the information of the available access point according to described acquisition, carries out what policing algorithm determined.
Described policing algorithm is qos parameter advantest method.
Described NAR is that certain resource of described terminal distribution refers to the memory headroom for data cached bag, this packet
The Eloc that destination address is described terminal.
The invention have the advantage that
(1), during terminal mobile handoff, the business on upper strata is unaffected；
(2) overcome terminal mobility in the novel routing architecture that identity and station location marker are separated to be divided by Route Distinguisher
The restriction of timing length；
(3) the novel routing architecture making identity and station location marker be separated can be supported in real-time multimedia traffic losing
The business that bag rate is more sensitive；
(4), in the case of getting rid of network failure factor, during terminal mobile handoff, packet can realize zero packet loss.
Accompanying drawing explanation
Fig. 1 is the network topological diagram of the novel routing architecture that identity and station location marker are separated；
Fig. 2 is signal flow schematic diagram during terminal handover network in the present invention；
Fig. 3 is one of specific embodiment schematic diagram of the present invention；
Fig. 4 is the two of a specific embodiment schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Heretofore described novel routing architecture refers to the routing architecture that identity and station location marker are separated.
Fig. 2 is signal flow schematic diagram during terminal handover network in the present invention.Such as figure, mobile terminal A is at moving process
In, detect when the service quality of the wireless link with PAR is decreased below certain threshold value, be scanned for the access point of periphery to obtain
Take periphery and by the information of access point, and can therefrom select optimal access point as NAR, then send RSPReq request to PAR,
PAR sends HSCReq request to NAR immediately；NAR identifies Eloc and for the terminal A dispensing position to be accessed after receiving this request
Fixed resource, such as the memory headroom etc. of data cached bag, is allocated successfully backward PAR and returns the HSCRsp sound carrying this Eloc information
Should；After PAR receives this response, on the one hand the RSPRsp carrying this Eloc information is responded and return to terminal A, PAR self simultaneously
Distribution, for forwarding the resource of packet, on the other hand returns to NAR and confirms message.
Wherein, the present invention is prepared by the following described optimal access point:
When, after end host starting up, periodically active detecting link quality of service QoS, when current wireless being detected
When the service quality of link is less than QoS threshold (this threshold value dynamically can update according to end host business demand) set, sweep
Retouch the access point network of periphery, obtain access-in point information available in surrounding enviroment, including service set ESSID of access point
(Service Set Identifier), qos parameter, ELoc address etc., and according to policing algorithm, such as qos parameter advantest method, choosing
Select out optimal access point.If this selected optimal access point gives this terminal distribution Eloc address to can use, if also
There are other access points, just select in other access points preferably access point as NAR.
Such as figure, after terminal A receives RSPRsp response message, sending ACK to PAR and confirm message, hereafter, PAR continues to
Mail to the packet of terminal A, be only intended to the packet mailing to terminal A received is transmitted to NAR, NAR cache；Eventually
End A configures the station location marker of self according to the station location marker Eloc that NAR distributes, and carries out two layers of link switching, accesses NAR；Switching
After completing, terminal A sends HGPReq to NAR and asks to fetch packet, after NAR receives this request, by the destination address of caching
Packet for the Eloc of terminal A is sent to terminal A.
Subsequently, terminal A sends ID_Eloc_Binding_Request to its local EMS Server and asks, request renewal <
ID, Eloc > map information, its local EMS Server performs to update operation, and backward terminal A of success returns ID_Eloc_
Binding_Reply responds；
Then, terminal A sends ACReq request to its Correspondent Node terminal, for verifying the verity of this message, Correspondent Node
Terminal sends Eloc_lookup_Request request, to carry out security verification, this local to the local EMS Server of terminal A
<ID, Eloc>mapping table that EMS Server inquiry has been updated over, by the information of the Eloc of carried terminal A with Eloc_lookup_
Reply response message is sent to Correspondent Node terminal；Correspondent Node terminal receives this response message, confirms the position mark of terminal A
Know Eloc really change, just to terminal A send ACK confirm message, meanwhile, update its store about terminal A < ID,
Eloc > mapping relations, subsequently, the packet of this Correspondent Node terminal transmission to terminal A all sends to NAR to the distribution of terminal A
Eloc address；
After terminal A receives the confirmation message of terminal B, send request to PAR, to ask PAR to discharge for forwarding to NAR
Destination address is the resource of the packet of the Eloc of terminal A, after PAR receives this request, discharges corresponding resource, then to end
End A returns and confirms message, has so far switched.
The present invention, by the method in the Eloc address of the former new access network of access network pre-acquiring, reduces mobile terminal and is cutting
The communication delay caused during switching network, meanwhile, before terminal switching, the packet that Correspondent Node terminal is sent is forwarded to NAR by PAR
To cache, effectively reduce packet loss, it is ensured that being normally carried out of communication.
Fig. 3 and Fig. 4 is a specific embodiment of the present invention.Such as figure, the Novel road being separated at identity and station location marker by
In the network of system, including a core net, several access network, and dns server, core net it is provided with several and accesses selvage
The core network edge router PE that edge router CE is connected, is additionally provided with EMS Server in each access network in addition to router CE.
The identity of terminal A in access network A and station location marker are respectively ID (A), Eloc (A), the position of EMS Server
Putting and be designated Eloc (EMS (A)), the identity of terminal B in access network B and station location marker are respectively ID (B), Eloc (B),
The station location marker of EMS Server is Eloc (EMS (B)), and in dns server, storage has<ID, Eloc (EMS)>mapping table, respectively connects
<ID, Eloc>mapping table of terminal in storage has present networks in the EMS Server networked, in each terminal, storage has Correspondent Node eventually
<ID, Eloc>mapping table of end.
Illustrating for greater clarity, the numbering in accompanying drawing and the sequence number in following method flow are the most right
Should.
When terminal A in access network A is intended to and the terminal B communication in access network B, and in communication process, the removal of terminal A connects
During networking A, concrete handling process is:
(1) terminal A sends inquiry request with ID (B) to dns server；
(2) dns server inquires about<ID, Eloc (EMS)>mapping table according to ID (B), returns Eloc (EMS to terminal A
(B))；
In dns server, storage has<ID, Eloc (EMS)>mapping table, i.e.<ID (A), Eloc (EMS (A))>,<ID (B),
Eloc (EMS (B)) > ..., the local EMS Server of this terminal place access network thus can be found according to identity
Station location marker.
(3) terminal A sends inquiry request, the Eloc of inquiry terminal B with ID (B) to EMS (B) according to Eloc (EMS (B))
(B)；
In the EMS Server of each access network, storage has<ID, Eloc>mapping table of each terminal in present networks, i.e.<ID
(A), Eloc (A)>,<ID (B), Eloc (B)>..., the station location marker of this terminal thus can be found according to identity.
(4) EMS (B) inquires about<ID, Eloc>mapping table according to ID (B), it is thus achieved that Eloc (B), and returns to terminal A；
(5) terminal A initiates communication request according to Eloc (B) to terminal B；
(6) request of terminal B response terminal A, the two starts communication；
(7) terminal A removal access network A, terminal A detects that the service quality of the wireless link with CE (A) (i.e. PAR) declines
To when being unsatisfactory for demand, scan periphery access point network, obtain periphery can the information of access point, when therefrom determining CE
(C) when (i.e. NAR) is optimal access point, terminal A sends RSPReq request to CE (A), and CE (A) initiates to CE (C) immediately
HSCReq asks, and carries address information Eloc (A) of terminal A in this HSCReq request；
Wherein, terminal A mainly includes ESSID and its ELoc address being intended to access point NAR, mesh to the message that CE (A) sends
Be to trigger the negotiation mechanism between PAR and NAR, to obtain spendable new station location marker Eloc in NAR.PAR and NAR assists
During business, PAR can be sent to NAR the Eloc (A) of terminal A, and the packet mailing to terminal A for further cache is prepared.
(8) if asking successfully, CE (C) is the Eloc, i.e. Eloc (C) that the distribution of terminal A is available, and distributes according to Eloc (A)
For caching the memory headroom of the packet that destination address is Eloc (A), and Eloc (C) is returned to CE (A), CE (A) enter one
Eloc (C) is returned to terminal A by step, and CE (A) self distribution simultaneously is used for the money forwarding destination address to be Eloc (A) packet
Source；If failure, i.e. terminal A does not get available Eloc, if also having other access points, then selects in other access points relatively
Good access point, repeats the request process in step (7).
There is the situation that following two is failed: the Eloc address of a kind of ESSID or NAR being request and the information of himself are not
Symbol, now receives NAT MATCH message；Meet although another kind is information, but owing to the abnormal causes such as storage inadequate resource are led
Cause can not accept switching, now receives NOT AVAIL message.
(9) terminal A is to CE (A) transmission ACK to confirm switching, and hereafter, destination address is Eloc (A) by CE (A)
Packet is forwarded to CE (C)；
After terminal A confirms switching, CE (A) continues to mail to the packet of terminal A, and is all forwarded by these packets
To CE (C).
(10) station location marker of terminal A configuration self is Eloc (C), carries out two layers of link switching, accesses CE (C)；
(11) after completing switching, terminal A sends HGPReq request to CE (C), fetches, with request, the number that CE (C) is its caching
According to bag；
(12) request of CE (C) response terminal A, is sent to terminal by the packet that the destination address of caching is Eloc (A)
A, and discharge the resource for caching the packet that destination address is Eloc (A), hereafter, CE (C) no longer caches destination address
For the packet of Eloc (A), but the packet that destination address is Eloc (A) is directly forwarded to terminal A.
(13) terminal A sends ID_Eloc_Binding_Request request to EMS (A), i.e. asks to update<ID, Eloc>
Mapping table, EMS (A) responds request, according to ID (A) and Eloc (C),<ID (A), Eloc (A)>is updated to<ID (A), Eloc (C)
>；
(14) EMS (A) is updated successfully, and returns ID_Eloc_Binding_Reply response to terminal A；
(15) terminal A sends ACReq request to terminal B, informs the change that self-position identifies；
The Eloc (C) that this request message will use after including Eloc (A) that terminal A is being currently used and switching.
(16) terminal B initiates Eloc_lookup_Request request to EMS (A), to confirm that the station location marker of terminal A is
No change；
(17) EMS (A) inquires about<ID, the Eloc>mapping table updated, and returns Eloc_lookup_Reply to terminal B
Response；
(18) terminal B confirms that the station location marker of terminal A changes, i.e. safety verification passes through, and returns ACK to terminal A and confirms to disappear
Breath；Meanwhile, terminal B updates<ID, Eloc>mapping table of the Correspondent Node terminal of its storage according to ID (A) and Eloc (C), will
<ID (A), Eloc (A)>is updated to<ID (A), Eloc (C)>, and subsequently, its packet mailing to terminal A sends to Eloc (C)；
(19) after terminal A receives the confirmation message of terminal B, to CE (A) send request, with ask CE (A) discharge for
The resource forwarding destination address to be Eloc (A) packet to CE (C), after CE (A) receives this request, discharges corresponding resource；
(20) CE (A) returns to terminal A and confirms message, has so far switched.
In the process, do not turn off the connection of original link owing to have employed, obtain the available Eloc ground of NAR in advance
Location, the method switched over the most again, it is to avoid the problem of communication disruption, substantially reduce handover delay；Meanwhile, cut in terminal
Before changing, by PAR, the packet that the destination address received is switching terminal is all forwarded to NAR, after to be switched end, eventually
End can fetch entire packet at NAR, it is achieved that zero packet loss, it is ensured that being normally carried out of communication.
It addition, the method for switching network of the present invention is applied equally to net interior switching, i.e. router before and after switching same
In one access network.When terminal A and terminal B terminal A in communication process carry out Intranet switching, the station location marker of terminal A by
Eloc (A) changes into Eloc (A`), is forwarded to newly access route by the packet that destination address is terminal A by the former route that accesses
To cache, then carry out two layers of link switching, after terminal switching, from new access route, fetch the data mailing to self
Bag, then send ID_Eloc_Binding_Request request to EMS (A), EMS (A) responds request, according to ID (A) and Eloc (A
`)<ID (A), Eloc (A)>is updated to<ID (A), Eloc (A`)>；Then terminal A sends ACReq request to terminal B, informs
The change of himself station location marker, terminal B carries out after safety verification passes through, updating the mapping table of the Correspondent Node of its storage, i.e.
<ID (A), Eloc (A)>being updated to<ID (A), Eloc (A`)>, subsequently, its packet mailing to terminal A sends to Eloc (A
`)；Finally, terminal A accesses, to former, the resource that route sends a request for dischargeing for forwarding packet, and former access route
Dischargeing corresponding resource, switching completes.
The above is presently preferred embodiments of the present invention and the know-why used thereof, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any based on the equivalence change on the basis of technical solution of the present invention
Change, simply replacement etc. is obvious changes, within belonging to scope.
Claims (6)
1. a method for switching network for mobile terminal zero packet loss under novel routing architecture, this routing architecture include core net and
Several access networks, are provided with identity position mapping server, i.e. EMS Server in each access network, in EMS Server, storage has Home Network
The identity of every station terminal and station location marker<ID, ELoc>mapping table in network, in each terminal, storage has its Correspondent Node terminal
<ID, ELoc>mapping table, it is characterised in that the method comprises the following steps:
1) monitoring the service quality of link during terminal moves when dropping to certain threshold value, scanning periphery access point network is to obtain
The information of available access point, and therefrom select optimal access point as new couple in router NAR, then it is currently accessed route to it
Device PAR initiates the RSPReq request for triggering negotiation mechanism between NAR and PAR, and PAR initiates for switched router to NAR
HSCReq request, this HSCReq request carries address information ELoc of this terminal；
2) NAR responds this HSCReq request, station location marker ELoc that this terminal distribution for be accessed is new and certain resource, and will
This new ELoc returns to PAR, PAR and the Eloc that this is new returns to this terminal further, and meanwhile, PAR self distribution is for turning
Sending out the resource of packet, the destination address of this packet is the ELoc of this terminal；
3) described terminal sends ACK to confirm to switch to PAR, and hereafter, PAR is by number that destination address is described terminal ELoc
It is forwarded to NAR according to bag；
4) described terminal switches over, and the station location marker configuring self is described new ELoc；
5) described terminal sends the HGPReq request for fetching packet to NAR, fetches the destination address of NAR caching with request
Packet for described terminal ELoc；
6) described terminal sends to its local EMS Server and carries the more newly requested of described new ELoc address, and this local EMS takes
Business device responds this request, updates<ID, ELoc>mapping relations of described terminal；
7) described terminal sends the ACReq request for informing himself address change to its Correspondent Node terminal, informs it
ELoc address change；
8) described Correspondent Node terminal initiates Eloc_lookup_Request request to described EMS Server, to carry out testing safely
Card；<ID, ELoc>mapping relations of described terminal after the inquiry renewal of described EMS Server, return result to described communication
Distant terminal；
9) this Correspondent Node terminal returns to described terminal and confirms response；
10) this Correspondent Node terminal updates<ID, ELoc>mapping table of its Correspondent Node terminal stored；Follow-up mail to described end
The packet of end sends to described new ELoc address.
2. the method for switching network of mobile terminal zero packet loss under novel routing architecture as claimed in claim 1, its feature exists
In, described step 10) also include afterwards:
11) described terminal sends a request for PAR to PAR and discharges described for forwarding the resource of packet；
12) PAR responds the request of described terminal, discharges the resource for forwarding packet.
3. the method for switching network of mobile terminal zero packet loss under novel routing architecture as claimed in claim 2, its feature exists
In, the information of described available access point includes service set, qos parameter, ELoc address.
4. the method for switching network of mobile terminal zero packet loss under novel routing architecture as claimed in claim 3, its feature exists
In, described optimal access point is the information of the available access point according to described acquisition, carries out what policing algorithm determined.
5. the method for switching network of mobile terminal zero packet loss under novel routing architecture as claimed in claim 4, its feature exists
In, described policing algorithm is qos parameter advantest method.
6. the method for switching network of mobile terminal zero packet loss under novel routing architecture as claimed in claim 1, its feature exists
In, described NAR is that certain resource of described terminal distribution refers to the memory headroom for data cached bag, the purpose of this packet
Address is the ELoc of described terminal.
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| CN108270689B (en) * | 2018-01-10 | 2021-06-01 | 中国人民解放军战略支援部队信息工程大学 | Method and device for realizing service connection |
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| CN101009932A (en) * | 2006-12-30 | 2007-08-01 | 华为技术有限公司 | A method, system and device for the service switching between the multi-mode networks |
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