CN103179621B - A kind of method that Cellular Networks switch with WLAN - Google Patents
A kind of method that Cellular Networks switch with WLAN Download PDFInfo
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- CN103179621B CN103179621B CN201110436205.0A CN201110436205A CN103179621B CN 103179621 B CN103179621 B CN 103179621B CN 201110436205 A CN201110436205 A CN 201110436205A CN 103179621 B CN103179621 B CN 103179621B
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Abstract
The method that Cellular Networks switch with WLAN is realized the invention discloses a kind of.In this method, communication terminal sends handover request to Cellular Networks gateway, Cellular Networks gateway receives handover request, therefrom extract Access Point Identifier, and determine whether access point has the ability to accommodate new traffic terminal according to Access Point Identifier, if nothing, Cellular Networks gateway sends the reply for forbidding switching to communication terminal；Otherwise, access point sends associated response to communication terminal；Communication terminal is received after associated response, changes local IP route table, and the priority of cellular link is reduced, at the same newly-built wireless local area network link route entry, and the priority of wireless local area network link is set to highest, start to send IP bags.Using the present invention, the continuity in handoff procedure can be realized independently of application program.Switched in addition, service server is imperceptible, the communication connection before switching can be remained to after switching.
Description
Technical field
Make the method for communication terminal free switching between Cellular Networks and WLAN the present invention relates to a kind of, belong to nothing
Line communication technology field.
Background technology
At present, Cellular Networks and WLAN are two separate networks, and access network is independently selected by communication terminal
Network, temporarily without the method for control communication terminal free switching between the two networks can be coordinated.Communication terminal is from a net
Exit, add after new network, it is necessary to reacquire the network address, this will cause original TCP/UDP after network switching in network
Communication will be unable to keep.
Existing heterogeneous network handoff technique is in order to ensure the continuity of communication, mainly by selecting high-quality candidate's net
Communication quality when network is to ensure that heterogeneous network switches.For example, what Huawei Tech Co., Ltd., Shanghai submitted on the 9th in September in 2008
Application for a patent for invention (application number：200810042875.2) in, propose that network side equipment sends switching type information logical to access
Believe terminal, then receive 2 cell from 3GPP2 cell to non-3 gpp that access communications terminal is carried out according to the switching type information
Switching so that access communications terminal can select most suitable switching type to be switched in the network of non-3 gpp 2.Particularly
For real time business and delay sensitive business, the switching type for being easy to it to select optimization to switch in time so that it can be with
Fulfil access authentication and mandate ahead of schedule, and target access system is wirelessly specifically consulted, configuration process, what reduction switched prolongs
When, improve performance, it is ensured that the continuity of access communications terminal traffic.
There is a kind of mode to be to change the address between heterogeneous network by the mapping relations of IP address in the prior art, it is real
The continuity now communicated.Application for a patent for invention (the application number that SK Telecommunication Co., Ltd. of South Korea submitted on October 17th, 2008：
200810166561.3) a kind of method that packet service is provided when being switched between heterogeneous network is described in and mobile logical
Believe terminal, the mobile communication terminal includes application module；Communication module；And communication control module, this method includes：By communication control
Molding block distributes virtual IP address to mobile communication terminal；Connected by application module using virtual IP address request grouped data；By communicating
Control module by the first mobile communications network connect modem by session be connected to the first mobile communications network and from its
It is assigned to the first IP；Virtual IP address is converted to the first IP by communication control module, by the first mobile communications network to specific transactions
Server transmitting request, and grouped data is sent to application module；Communication control module is connected by the second mobile communications network
Connect modem and session is connected to the second mobile communications network, and the 2nd IP is assigned to from it, application module storage is last
The frame number of the frame received from service-specific server；Virtual IP address is converted to the 2nd IP by communication control module, from the last reception
To the next frame of frame start to receive grouped data, and transmit to application module received grouped data.
In above-mentioned handoff technique, because the application module in terminal needs to interact with communication control module, so typically
Application program has to pass through modification and (is required to before record switching from the last received frame number of service server, having after switching can
Can need to reconnect service server), increase after function, can just be used in the handoff technique.Which limits the switching skill
The practical application of art, it is difficult to be universally accepted.Moreover, from the point of view of terminal point, communication is connection；But from service server
From the perspective of, before the handover after, service server can not keep same connection.It is original during switching i.e. in terms of service server
Connection disconnects, and receives the connection request for once carrying out self terminal again afterwards.Therefore, in the handoff technique, the work(of service server
Data download service can be limited in, other business may be not supported.
The content of the invention
All business based on ICP/IP protocol can be supported it is an object of the invention to provide a kind of, independently of applying journey
Sequence and the method that the Cellular Networks of the continuity in handoff procedure can be kept to switch with WLAN.
To realize above-mentioned goal of the invention, the present invention uses following technical schemes：
A kind of method that Cellular Networks switch with WLAN, multiple communication terminals are when adding Cellular Networks, by the honeybee
Nest net gateway distributes IP address, and the Cellular Networks gateway is clicked through by multiple accesses in IP kernel heart net and the WLAN
Row communication, the Cellular Networks gateway and described access point have identifier and have allocated IP address in advance respectively, and its feature exists
In comprising the following steps：
Step 1：The communication terminal searches wireless lan channel, obtains described access point identifier；
Step 2：The communication terminal sends the first handover request, described first by Cellular Networks chain road direction Cellular Networks gateway
The content of handover request includes described access point identifier；
Step 3：The Cellular Networks gateway receives first handover request from the cellular link, therefrom extracts institute
Access Point Identifier is stated, and determines whether access point corresponding with described access point identifier has the ability to accommodate new traffic terminal,
If nothing, the Cellular Networks gateway sends the reply for forbidding switching by the cellular link to the communication terminal；Otherwise, enter
Enter step 4；
Step 4：The Cellular Networks gateway sends the first pre-switch to described access point by the IP kernel heart net and asked, institute
Stating the content of pre-switch request includes the identifier of communication terminal and the IP address of communication terminal；
Step 5：Described access point receives the first pre-switch request from the IP kernel heart net, and pre- from described first
Extracted in handover request and record the communication terminal IP address and the communications terminal identifiers, then send the first pre-switch sound
Should；
Step 6：The Cellular Networks gateway receives first pre-switch response, then by the cellular link to described
Communication terminal, which is sent, represents to allow the first switching of switching to reply；Otherwise being sent to the communication terminal forbids switching to reply；
Step 7：The communication terminal extracts in being replied from first switching received and records described access point
Wave point IP, into step 8；
Step 8：The communication terminal starts to cache outgoing IP bags, and initiates association request to described access point；
Step 9：Described access point is received after the association request, and associated response is sent to the communication terminal；
Step 10：The communication terminal is received after the associated response, local IP route table is changed, by the honeycomb chain
The priority reduction on road, while newly-built wireless local area network link route entry, and by the priority of the wireless local area network link
Highest is set to, starts to send IP bags.
In the present invention, application program need not be interacted with other modules, and general application program need not be changed, can be with
Handoff functionality directly is used, so realizing the continuity in handoff procedure independently of application program.In addition, service server
Imperceptible to switch, the communication connection before switching can be remained to after switching.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic network structure of the present invention.
Fig. 2 is the Cellular Networks gateway module schematic diagram of the present invention.
Fig. 3 is the wireless local network connecting point module diagram of the present invention.
Fig. 4 is the flow chart switched from Cellular Networks to WLAN of the present invention.
Fig. 5 is the flow chart switched from WLAN to Cellular Networks of the present invention.
Embodiment
Below, the specific skill of the present invention is illustrated using the representative of GSM cellular network and WLAN as heterogeneous network
Art scheme.But, present invention could apply to the switching of Cellular Networks and WLAN, wherein Cellular Networks are not limited to GSM, can
Be CDMA or 3G net etc. using honeycomb network.
As shown in figure 1, the present invention is applied to the switching between GSM cellular network and WLAN.In the net shown in Fig. 1
In network structure, GSM Cellular Networks are including Cellular Networks gateway 1, the multiple base station controllers (BSC) being connected with Cellular Networks gateway, and
The multiple base stations (BS) being connected with base station controller.Wireless communication terminal is wirelessly realized with base station and communicated.Shown in Fig. 1
In WLAN, IP kernel heart net is directly connected to Cellular Networks gateway, multiple WAPs (AP) 2 connection IP kernel heart nets and
It can be communicated with communication terminal 3.
In the present invention, Cellular Networks gateway 1 is directly accessed IP kernel heart net, with IP layers of routing function, can handle IP bags.
As shown in Fig. 2 Cellular Networks gateway includes network information management module 11, Cellular Networks IP packet handing modules 12, honeycomb net address puppet
Die-filling piece 13 and gateway handoff control module 14.
Wherein, network information management module safeguards an IP address pond 110, and each IP address in recording address pond
State：It is idle, taken, taken by access point by communication terminal.IP address in the address pool is assigned to communication terminal and used
Or distribute to the wave point of access point and use.Address in pond is entirely the private ip that Internet is not directly addressed, and
In same continuous address field.Address in pond is divided into three parts：Part I includes an IP address, is set up in network
Before allocate in advance, be used as the cellular link IP of honeycomb gateway；Part II includes several IP address, before network is set up in advance
Distribution, is used as the wave point IP of access point；Part III includes several IP address, networks and notes in Cellular Networks in communication terminal
Communication terminal is distributed to during volume, as communication terminal IP, and IP address pond is returned to when communication terminal is nullified.
In addition, network information management module also safeguards gateway terminal information bank 111 and access-in point information storehouse 112.Terminal is believed
The state of all communication terminals in the record net of storehouse 111 is ceased, for aiding in switching.The entry contents bag of gateway terminal information bank 111
Include：(value can be for link that communications terminal identifiers, communication terminal (privately owned) IP address, communication terminal are being used now：
Cellular Networks link or wireless local area network link), communication terminal use wireless local area network link when APN.Access point is believed
The state of all WAPs in the record net of storehouse 112 is ceased, for aiding in switching.The entry contents in access-in point information storehouse include：
Access Point Identifier, wireline interface IP address, wave point IP address, the communication terminal quantity associated with access point.
Cellular Networks IP packet handing modules 12 are used to provide IP packages reconciliation machine contracting system.IP encapsulatings can be put into new IP bags by it
In, the package of IP-in-IP forms is generated, and initial IP packet can be solved from the package of IP-in-IP forms.
Honeycomb net address pretends module 13, for safeguarding cellular address camouflage table 130, record original IP, original port numbers,
Pretend IP, camouflage port numbers and the last use time of the entry, and according to the record information of cellular address camouflage table 130,
Perform address camouflage function.Just set up when terminal is communicated using a new port numbers with service server every time one it is new
Address pretends table clause.Former IP is that the terminal IP before camouflage is exactly former IP for camouflage IP.
For Cellular Networks gateway, in an initial condition, endless networks, and the address camouflage table of Cellular Networks gateway is
It is empty.The source of the address camouflage table clause of Cellular Networks gateway has two：
1) terminal is switched to Cellular Networks and handover success from WLAN, is originally located on wireless local network connecting point
Related to terminal address camouflage table clause (if there is such entry), Cellular Networks gateway will be copied to and (passed through
Pre-switch instruction in handoff procedure) and it is added to the address camouflage table of Cellular Networks gateway.
2) when sending IP bags to the service server positioned at IP kernel heart net when the terminal using Cellular Networks link, Cellular Networks net
The address camouflage table for going to inquire about on Cellular Networks gateway by index of the source IP and source port number of IP bags is closed, in address camouflage table not
There is such a entry, (former IP address of entry is equal to the source that the source address of IP bags, the former port numbers of entry are equal to IP bags
Slogan) when, Cellular Networks gateway can newly-built address camouflage table clause.
Likewise, for wireless local network connecting point, access point is when just starting successfully, its address camouflage table
For sky.The source of the address camouflage table clause of wireless local network connecting point has two：
1) terminal is switched to WLAN and handover success from Cellular Networks, originally be located at Cellular Networks gateway on this
The related address camouflage table clause (if there is such entry) of terminal, will be copied to wireless local network connecting point and (passes through
Pre-switch instruction in handoff procedure) and it is added to the address camouflage table of Cellular Networks gateway.
2) when sending IP bags to the service server positioned at IP kernel heart net when the terminal using wireless local area network link, wirelessly
LAP LAN Access Point removes the address camouflage table inquired about on wireless local network connecting point by index of the source IP and source port number of IP bags,
Such a entry is not present in address camouflage table, and (former IP address of entry is equal to the former port of the source address of IP bags, entry
Number be equal to the source port number of IP bags) when, wireless local network connecting point can a newly-built address pretend table clause.
Camouflage table clause in address is not corresponded with terminal, but corresponding with " IP address and port ".For example, one just
In the terminal using Cellular Networks link, its IP address is IPE1, using port PO RTE1 connections service server 1, together
When use port PO RTE2 connections service server 2.The IP kernel heart network interface address of Cellular Networks gateway is IPG then Cellular Networks gateways
On address camouflage table should have such entry.
| Former IP | Former port | IP after camouflage | Port after camouflage |
| IPE1 | PORTE1 | IPG | Certain port A in Cellular Networks |
| IPE1 | PORTE2 | IPG | Certain port B in Cellular Networks |
Even if also, terminal uses Cellular Networks link, but not sending IP bags to service server all the time, then Cellular Networks net
The address camouflage table clause related to the terminal will not also be set up by closing.
Similarly, even if terminal uses wireless local area network link, but IP bags are not sent to service server all the time, then wirelessly
LAP LAN Access Point will not also set up the address camouflage table clause related to the terminal.That is, Cellular Networks gateway or WLAN
The behavior that access point sets up address camouflage table clause is all to send IP bags to service server from terminal to trigger.
Gateway handoff control module 14, with network information management module 11, Cellular Networks IP packet handing modules 12 and honeycomb
Net camouflage module 13 carries out information exchange, interacts, assists for switching over control signaling between communication terminal 3 and access point 2
Adjust various equipment in net to complete switching flow, and manage other what's news.
In the present invention, wireless local network connecting point 2 is directly accessed IP kernel heart net, with IP layers of routing function, can handle
IP bags.WAP has unique Access Point Identifier.As shown in figure 3, wireless local network connecting point includes end message
Management module 21, access point IP packet handing modules 22, access dot address camouflage module 23 and access point switching control module 24.Under
Face is described as follows with reference to Fig. 3：
End message management module 21, for safeguarding an access point end message storehouse 210, is recorded in local wireless local
Communication terminal state in net, for aiding in switching.Entry contents in access point end message storehouse 210 include currently with access
Communications terminal identifiers, the IP address of point association.
Access point IP packet handing modules 22, machine contracting system is conciliate for providing IP packages, can put into IP encapsulatings in new IP bags,
The package of IP-in-IP forms is generated, and initial IP packet can be solved from the package of IP-in-IP forms.
Dot address camouflage module 23 is accessed, for safeguarding an access dot address camouflage table 230, record original IP, former port
Number, camouflage IP, camouflage port numbers and time for using entry the last time, and pretend according to access dot address the note of table 230
Information is recorded, address camouflage function is performed.
Access point switching control module 24, with end message management module 21, access point IP packet handing modules 22 and connecing
Enter dot address camouflage module 23 and carry out information exchange, for switching over control letter between Cellular Networks gateway 1 and communication terminal 3
Order interaction, receives the control instruction of Cellular Networks gateway 1, completes switching flow, and manage other two what's news.
Communication terminal 3 has unique communications terminal identifiers, and Cellular Networks and WLAN can be accessed simultaneously, and
Local routing table, the outgoing data bag of energy buffer some amount can be changed.The bar for the local information library that communication terminal is safeguarded
Mesh content includes：The Access Point Identifier that has associated, the IP address of access point.Communication terminal also includes switching control module, uses
In initiating handover request, receive and process switching control signaling, change local IP route table, complete switching flow.
Communication is maintained to when illustrating that communication terminal is switched between heterogeneous network with reference to Fig. 4 and Fig. 5
Mechanism.The method that communication terminal provided by the present invention switches between Cellular Networks and WLAN, including communication terminal from
The situation that the situation and communication terminal that Cellular Networks switch to WLAN switch from WLAN to Cellular Networks.The present invention
Communication terminal 3 initially network when, be all by Cellular Networks link connection to Cellular Networks gateway 1, the secondary IP address of Cellular Networks gateway 1
A free address is distributed in pond to communication terminal 3.Communication of the communication terminal 3 at IP layers, all the time using this IP address, without
Distinguish specifically used link.
Fig. 4 is combined first, illustrates that the communication terminal in first embodiment of the invention switches from Cellular Networks to WLAN
Situation, it comprises the following steps.
Step 1：Communication terminal 3 judges the letter in the WLAN of current location according to radio environment measurements result
Number level value reaches threshold values set in advance, and the search wireless lan channel of communication terminal 3 obtains and is used as (wireless office of access side
Domain net) access point identifier.
Communication terminal 3 obtains the identifier for the access point currently caning be found that according to a kind of mechanism.This mechanism can be
It is existing or newly define in protocol of wireless local area network.Typically, the wireless local of the standards of IEEE 802.11 is met
In net, the domain of a record network identifier is just included in mac frame；Communication terminal 3 can be by passively listening or active broadcast
The mode of beacon request frame, to obtain the beacon frame that access point is sent, and extracts from beacon frame network identifier, as connecing
Enter point identifier.
Afterwards, according to a kind of mechanism, communication terminal 3 selects an access point to be used as target access.This mechanism can be with
It is existing in protocol of wireless local area network or newly defines.Typically, can be with when there is multiple access points
The maximum access point of selection wherein signal intensity is used as target access.
The trigger event of network switching request is initiated, can be that foregoing level value reaches threshold values to trigger, can also basis
Network QoS value is triggered, or other usual manners.
Step 2：Communication terminal 3 sends handover request 1 by Cellular Networks chain road direction Cellular Networks gateway 1.Handover request 1 it is interior
Appearance includes the Access Point Identifier of objective network.
Step 3：Cellular Networks gateway 1 receives the handover request 1 of communication terminal 3 from cellular link, therefrom extracts access
Point identifier, gateway handoff control module 14 by inquiring about the access-in point information storehouse 112 in network information management module 11, it is determined that
Whether the corresponding access point of objective network has the ability to accommodate new traffic terminal.If nothing, Cellular Networks gateway 1 by cellular link to
Communication terminal 3 sends the reply 1 for forbidding switching；Otherwise, into step 4.
Here, the accessible communication terminal quantity of each access point is set in advance.Local in Cellular Networks gateway connects
WAP state is recorded in access point information bank.The Access Point Identifier for asking to include in 1 according to pre-switch, honeycomb
The gateway handoff control module 14 of gateway can find the state of corresponding WAP, obtain the wireline interface of the access point
IP, wave point IP, the communication terminal quantity associated with access point.By inquiring about local access point information bank 112, gateway is cut
Change the communication terminal quantity that control module 14 has obtained having associated with access point.If the communication terminal number associated with access point
Amount is not reaching to limit value, then the gateway handoff control module 14 of honeycomb gateway is judged as that the access point can accommodate new traffic end
End, then into step 4.If the communication terminal quantity associated with access point has reached limit value, the gateway of honeycomb gateway
Switching control module 14 is judged as that the access point can not accommodate new traffic terminal, sends the reply 1 for forbidding switching.
Communication terminal 3 is received after the reply 1 for forbidding switching, can there is two schemes.One kind is to continue with using Cellular Networks
Link；Another is to re-search for second largest WAP of signal level value, and is switched to by Cellular Networks gateway requests
Second largest WAP of the level value.It is whole that Cellular Networks gateway similarly judges whether the access point can accommodate new traffic
End, and send the reply for forbidding or allowing to switch.By that analogy, until Cellular Networks gateway judges communication terminal request switching
Access point can accommodate new traffic terminal, into step 4；Or access point of all signal intensities more than threshold values is all communicated
Terminal is attempted request connection and finished, and terminal is continuing with Cellular Networks link.
Step 4：Cellular Networks gateway 1 sends pre-switch request 1 by IP kernel heart net to access point 2.Pre-switch request 1 it is interior
Appearance includes communications terminal identifiers and communication terminal IP address.The cellular address camouflage module 13 of Cellular Networks gateway 1 is according to logical
Believe IP address of terminal, inquiry address camouflage table.If there is such entry, i.e., the original preserved in the entry in address camouflage table
IP address is identical with the IP address of terminal of request switching, then the switching control module 14 of Cellular Networks gateway 1 is by all these
Purpose duplicate is added in pre-switch request 1, sends jointly to access point.
Step 5：WAP 2 receives the pre-switch request 1 from Cellular Networks gateway 1 from IP kernel heart net, and from pre-
Extracted and recording communication terminal former IP address and communications terminal identifiers in handover request 1, if including ground in pre-switch request
Location pretends the entry duplicate of table, then keeps in these duplicates.Again pre-switch response 1 is sent to Cellular Networks gateway 1.
Step 6：Cellular Networks gateway 1 receives the pre-switch response 1 of access point 2 in stand-by period t2, then passes through honeycomb
Chain road direction communication terminal 3, which is sent, allows switching to reply 1；If not receiving the reply of access point, net in stand-by period t 2
Concern, which is changed control module 14 and sent by cellular link to communication terminal 3, forbids switching to reply 1.Switching is allowed to reply 1 content
Including Access Point Identifier and access point wave point IP.
Step 7：Communication terminal in stand-by period t1 if do not receive the reply of honeycomb gateway or receive be prohibit
Only switching replys 1, then it is assumed that handoff failure, can there is following two schemes：1) it is continuing with Cellular Networks link；2) re-search for
Channel finds new target access.
If have received that Cellular Networks gateway sends in stand-by period t1 allows switching to reply 1, communication terminal
Switching is allowed to extract Access Point Identifier and access point wave point IP in replying 1 from what is received, according to access point identity
Symbol judges the access point asks to set up the access point of association before whether being exactly oneself, if so, then entering step 8.
Step 8：Communication terminal starts to cache outgoing IP bags.Meanwhile, communication terminal is used as a ginseng using Access Point Identifier
Number, according to MAC Layer in Wireless agreement (typical such as IEEE 802.11), initiating association to wireless local network connecting point please
Ask.This process is completed under the ip layer.
Step 9：Access point receives communication terminal MAC layer association request from wave point, and the communication in request is whole
End identifier is confirmed whether it is to be switched communication terminal.
If the communications terminal identifiers included in association request are consistent with the communications terminal identifiers recorded in step 5,
It is to be switched communication terminal that then access point, which confirms, then receives the association request of communication terminal, sends the association for representing to receive association
Response, and communication terminal former IP address and communications terminal identifiers are added in local communication end message storehouse, if in step
Being kept in rapid 5 has address to pretend table clause duplicate, then these entry duplicates is added into local address camouflage table, and pass through IP kernel
Heart net sends switching to Cellular Networks gateway and confirms 1, terminates switching.If without duplicate, directly by IP kernel heart net to Cellular Networks
Gateway sends switching and confirms 1.
If inconsistent with the communications terminal identifiers that are recorded in step 5, access point really admits a fault to be switched communication eventually
End, then refuse the association request of communication terminal.If after pre-switch response 1 has been sent in the t3 times, not completing MAC layer pass
Connection, then the terminal identifier and IP address of terminal recorded in delete step 5, and in delete step 5 keep in the terminal-pair should
Address camouflage table clause duplicate, terminate switching.It is foregoing to be associated without completion MAC layer, include two kinds of situations：It is not received by logical
Believe association request or the association failure of terminal mac layer.
Step 10：Communication terminal is received after the associated response of expression receiving association of access point, and communication terminal is utilized and cut
Change control module to change local IP route table, the priority of cellular link is reduced, while newly-built wireless local area network link road
Highest is set to by entry, and by the priority of wireless local area network link.The IP bags of caching are preferentially sent, stop caching IP
Bag, and start normal send.
Step 11：Access point 2 sends the switching confirmation for representing that communication terminal has been switched to access point to Cellular Networks gateway 1
1；Cellular Networks gateway 1 have sent to communication terminal 3 allow switching reply 1 after, if (that is, received at the appointed time
In time t3 after pre-switch response 1 from access point) the switching confirmation 1 that access point 2 is sent is received from IP kernel heart net,
The corresponding communication terminal in communication terminal information storehouse is then increased into the access in access-in point information storehouse labeled as Radio Link is used
The communication terminal quantity of association of point, deletes former IP address and IP address of terminal identical entry in local address camouflage table, complete
Into switching；If do not receive switching confirm 1, do not do it is foregoing by communication terminal be labeled as using Radio Link, increase association communication
Terminal quantity, the operation for deleting respective entries.
Request between communication terminal and access point associates-and the process replied of association is by WLAN MAC Protocol
(such as IEEE 802.11) is defined, and will herein be described in detail.But the switching control module of communication terminal can get holding for association request
Row state：It is successfully associated or failure.When being successfully associated local IP route table is changed using switching control module.
By above-mentioned steps 1 to step 10, the communication terminal positioned at Cellular Networks gateway has been switched to WLAN.It
Afterwards, communication terminal is led to using the private IP address of Cellular Networks gateway distribution during network registration with wireless local network connecting point all the time
Letter, module is pretended according to address camouflage table to the IP bags execution address camouflage from communication terminal by the address of access point, then will
IP bags after the camouflage of address are sent to IP kernel heart net.Address camouflage process is, with the IP bags from communication terminal that receive
Source address and source port number inquiry local address camouflage table, if the former IP for having matching entry, i.e. entry is equal to the source IP of IP bags, bar
Purpose original port numbers are equal to IP bag source port numbers, then IP bag source IPs are replaced with to the IP after the camouflage in matching entry, by IP bags
Source port number replace with matching entry camouflage rear end slogan；If no matching item, a newly-built address pretends entry, bar
Purpose original IP, which is filled with the source IP of IP bags, the former port numbers of entry and is filled with IP after the source port number of IP bags, the camouflage of entry, to be filled out
Fill meet IP for access point IP kernel heart net, the camouflage rear end slogan of entry is filled with the arbitrary end that current wireless access point is not used
Slogan, reuses this entry and performs the source IP of IP bags and the replacement of source port number afterwards) it is such ensure that communication terminal from
Cellular Networks to WLAN switch when continuity.
With reference to Fig. 5, illustrate that the communication terminal in first embodiment of the invention switches from WLAN to Cellular Networks
Situation, it comprises the following steps.
Step 21：When communication terminal detects the signal level value of the WLAN communicated till now less than threshold values
When, communication terminal starts to cache outgoing IP bags, until switching flow terminates.
Step 22：Communication terminal sends handover request 2 by wireless local area network link to access point.
Step 23：Access point receives the handover request 2 of communication terminal from wave point, by IP kernel heart net to Cellular Networks
Gateway sends pre-switch request 2.Pre-switch request 2 includes communications terminal identifiers and communication terminal former IP address, access point mark
Know symbol.When access point address camouflage table in, when there is such entry (former IP address of entry is identical with IP address of terminal),
The duplicate of all these entries will be added in pre-switch request 2, send jointly to Cellular Networks gateway.
Terminal do not communicate all the time to service server or the address related with a terminal pretend table clause all because
When expired and deleted, there will be no the duplication of address camouflage article purpose.
Step 24：Cellular Networks gateway receives the pre-switch request 2 that access point is sent from IP kernel heart net, from pre-switch request
Communications terminal identifiers and communication terminal former IP address are taken out in 2, if answered in pre-switch request 2 comprising address camouflage table clause
This, then keep in these duplicates.
Step 25：Cellular Networks gateway 1 sends pre-switch response 2 to access point 2.
Step 26：In stand-by period t6, access point is whole to communication by wave point if pre-switch response 2 is received
End transmission allows switching to reply 2, into step 27；If not receiving pre-switch response 2, sent to communication terminal and forbid cutting
Multiple 2 are gained, and terminates switching flow.
Step 27：In stand-by period t4, allow switching to reply 2 from access point if communication terminal is received, repair
Change local IP route table, and Cellular Networks link routing priority is risen into highest, sent out by Cellular Networks chain road direction Cellular Networks gateway
Handover request 3 is sent, into step 28；If do not receive reply or receive be forbid switching reply 2, communication terminal is recognized
For handoff failure, there can be two schemes：1) recover WLAN and route priority to highest, initiate to cut to access point again
Request is changed, or is continuing with the access point；2) terminal resets, attempt to rejoin network by Cellular Networks link.
Step 28：In stand-by period t7, if Cellular Networks gateway receives the switching from communication terminal from cellular link
Request 3, then honeycomb gateway inspection send the handover request 3 communications terminal identifiers and IP address whether with it is pre- in step 24
The communications terminal identifiers obtained in handover request 2 are identical with communication terminal IP address, identical then to enter step 29, differ then
Send comprising forbidding the switching of switching mark to reply 3, terminate switching flow.
In stand-by period t7, if honeycomb gateway does not receive the handover request 3 from communication terminal from cellular link,
The blotter (communications terminal identifiers and IP address) then set up in delete step 14, and delete temporary related to the terminal
Address pretends table duplicate, terminates switching flow.
Step 29：Cellular Networks gateway sends the switching comprising permission switching mark to communication terminal by cellular link and replied
3, correspondence communication terminal in local communication end message storehouse is labeled as using Cellular Networks link, will be pseudo- with the terminal relative address
Dress table duplicate is added to local address camouflage table, and sending switching to the former association access point of terminal by IP kernel heart net confirms 2, and subtracts
Former association access point association communication terminal quantity in the local access point information bank of few Cellular Networks gateway, completes switching.
Step 30：In stand-by period t5, if communication terminal 3 is received from Cellular Networks gateway 1 from cellular link
Comprising allowing the switching of switching mark to reply 3, then disconnect and being connected with the MAC of access point 2, delete wireless local area network link route,
Caching bag is sent to Cellular Networks gateway by Cellular Networks link, switching is completed；If communication terminal 3 does not receive switching and replied
3 or receive be comprising forbid switching mark switching reply 3, then it is assumed that handoff failure, can have two schemes：1) recover
WLAN route priority to highest, initiates handover request to access point again, or be continuing with the access point；2) terminal
Reset, attempt to rejoin network by Cellular Networks link.
Step 31：Wireless local network connecting point 2 is after the confirmation of the switching from Cellular Networks gateway 12 is received, by the terminal
Information is deleted from local access point end message storehouse 210, by former IP address and terminal IP phases in access dot address camouflage table 230
Same entry is deleted, and completes switching.
Cellular Networks gateway and wireless local network connecting point pretend the maintaining method of table to address：
1. address pretends table clause content
Cellular Networks gateway safeguards the address camouflage table of oneself respectively with wireless local network connecting point, and an address pretends table
Entry contents include：The port numbers after IP, camouflage after former IP, former port numbers, camouflage, the last time using this entry when
Between.
2. address pretends the up matching of table
Two tuples constituted with a given IP address and given port numbers, removal search address camouflage table.When in the presence of one
Entry, former IP is identical with given IP and during former port numbers identical with given port numbers, the match is successful, and otherwise it fails to match.
3. address pretends the descending matching of table
Two tuples constituted with a given IP address and given port numbers, removal search address camouflage table.When in the presence of one
Entry, the IP after camouflage is identical with given IP and camouflage after port numbers it is identical with given port numbers when, otherwise the match is successful,
With failure.
4. address pretends
The purpose IP of IP bags is replaced with to the IP after the camouflage in address camouflage table clause, the destination slogan of IP bags is replaced
It is changed to the port numbers after the camouflage in address camouflage table clause.It is current time to update entry use time.
5. solve address camouflage
The purpose IP of IP bags is replaced with into the former IP in address camouflage table clause, the destination slogan of IP bags is replaced with ground
Former port numbers in location camouflage table clause.It is current time to update entry use time.
The camouflage entry 6. Cellular Networks gateway Adds Address
Two tuples of an IP address and port numbers composition are given, a newly-built address pretends table clause, the former IP of entry
Given IP is filled with, former port numbers are filled with given port numbers, and the IP after the camouflage of entry is filled with Cellular Networks gateway
Core network interface IP, the port numbers after the camouflage of entry are filled with unappropriated arbitrary end slogan on existing cellular net gateway,
Nearest use time is initialized as current time.
7. Cellular Networks gateway deletes address camouflage table clause
Cellular Networks gateway intermittent scanning local address pretends table, if an entry continues for some time interior be not used by
(i.e. more than one threshold values of the difference of current time and entry use time), then delete the entry.
The camouflage table clause 8. wireless local network connecting point Adds Address
Two tuples of an IP address and port numbers composition are given, a newly-built address pretends table clause, the former IP of entry
Given IP is filled with, former port numbers are filled with given port numbers, and the IP after the camouflage of entry is filled with WLAN and connect
The core network interface IP of access point, the port numbers after the camouflage of entry are filled with unappropriated arbitrary end on current local access point
Slogan, nearest use time is initialized as current time.
9. wireless local network connecting point deletes address camouflage table clause：
Each entry of the address camouflage table of wireless local network connecting point has the last use time of a record
Variable, if an entry continue for some time in be not used by, the entry is deleted.
Herein, " use " and refer to, there is a domain to be used to record entry use time in address camouflage table clause.Use meaning
And carry out primary address conversion according to the entry.By taking Cellular Networks gateway as an example, received from Cellular Networks link after IP bags, with IP bags
Source address and source port number be address camouflage table on search index Cellular Networks gateway, if with the former IP of certain entry and original end
Slogan is matched respectively, then the source address and source port of IP bags are replaced according to entry, while updating the use time of the entry to work as
The preceding time；Received from core network interface after IP bags, go to inquire about address camouflage table with the destination address and destination slogan of IP bags,
If matched respectively with the IP after the camouflage of certain entry and the port numbers after camouflage, the destination address of IP bags is replaced according to entry
And destination slogan, while the use time for updating the entry is current time.Wireless local network connecting point is similarly.
Cellular Networks gateway and wireless local network connecting point is described below to the processing method of the IP bags received.
Illustrate Cellular Networks gateway first to the processing method of the IP bags received from Cellular Networks link, it comprises the steps
A1 to step A5.
A1 local information table) is inquired about according to source IP address, if the corresponding terminal of the source IP address uses Cellular Networks
Link, then perform step A3)；If corresponding terminal uses wireless local area network link, step A2 is performed；
A2 it is to use Cellular Networks link by the corresponding terminal label of the IP address, and connect to correspondence) in local information library
Access point sends end message and deletes notice, and end message is deleted identifier and IP address comprising terminal in notice, performed afterwards
Step A3).
A3) using the source IP address of IP bags and source port number that are received from Cellular Networks link as index, to local camouflage table
Up matching is carried out, step A4 is performed if it fails to match)；The match is successful performs step AS).
A4) using the source IP address of IP bags and source port number that are received from Cellular Networks link as parameter, a newly-built address
Pretend table clause.The entry becomes matching entry.Perform step AS).
AS) the address camouflage table clause according to matching performs address camouflage to IP bags, and new IP bags are sent into IP kernel heart net.
Secondly, Cellular Networks gateway is illustrated to the processing method of the IP bags received from IP kernel heart net, it comprises the steps
B1 to step B6.
B1) check whether as IP-in-IP packages.If then performing B2), otherwise perform B5).
B2 original packed IP bags) are solved, and local information library is inquired about according to the purpose IP address of initial IP packet, are checked
The link that the corresponding terminals of the IP are being used, if Cellular Networks link, then performs B3)；If wireless local area network link,
Then perform B4)；Other situations abandon the IP bags, and processing terminates.
B3 IP bags) are sent to terminal by Cellular Networks link, processing terminates.
B4 local information library) is inquired about, the IP kernel heart network interface address of the access point of communication terminal association is obtained, by IP bags
The access point of correlation is sent in IP-in-IP forms, processing terminates.
B5) enter the descending matching of row address camouflage table using the purpose IP and destination slogan of IP bags, performed if the match is successful
B6), it fails to match then abandons the IP bags, and processing terminates.
B6 table clause) is pretended according to the address of matching, the camouflage of solution address is carried out to the IP bags received, according to new IP bags
Purpose IP address inquires about local information table, should if the corresponding communication terminal of the IP address uses Cellular Networks link
IP bags are sent to terminal by Cellular Networks link, and processing terminates；If using wireless local area network link, B4 is performed)；Other
Situation, abandons the IP bags, and processing terminates.
Illustrate wireless local network connecting point again to the processing method of the IP bags received from wireless local area network link, it is wrapped
Following step C1 is included to step C3.
C1) the up matching of address camouflage table is performed by index of the source IP address and source port number of IP bags.If there is matching bar
Mesh, performs C3)；Otherwise C2 is performed).
C2) source IP address and source port number using IP bags is parameters, and a newly-built address pretends table clause.The entry
For matching entry.Perform C3).
C3 IP bags) are sent to terminal by Cellular Networks link, processing terminates.
Finally illustrate wireless local network connecting point to the processing method of the IP bags received from IP kernel heart net, it includes following
Step D1 to D6.
D1) access point is checked whether as IP-in-IP packages.If then performing D2)；Otherwise D4 is performed).
D2) access point is attempted to solve original packed IP bags, and inquires about local according to the purpose IP address of initial IP packet
Information bank, judges whether the terminal associates with oneself, if IP bags then are sent into the terminal by wireless local area network link, place
Reason terminates；Otherwise D3 is performed).
D3) access point abandons IP bags, and processing terminates.
D4) access point performs the descending matching of address camouflage table by index of the purpose IP and destination slogan of IP bags, if
With failure, then IP bags are abandoned, processing terminates；If the match is successful, D5 is performed).
D5) access point performs the camouflage of solution address to IP bags, local information library is inquired about according to the purpose IP of new IP bags, if mesh
IP counterpart terminals associated with oneself, then IP bags are sent to by terminal by wireless local area network link, processing terminates；Otherwise perform
D6)；
D6) IP bags are sent to Cellular Networks gateway by access point in the form of IP-in-IP by IP kernel heart net, and processing terminates.
The method and system that Cellular Networks provided by the present invention and WLAN switch have been carried out specifically above
It is bright.To those skilled in the art, on the premise of without departing substantially from true spirit to it done it is any aobvious and easy
The change seen, will all constitute to infringement of patent right of the present invention, will undertake corresponding legal liabilities.
Claims (7)
1. a kind of method that Cellular Networks switch with WLAN, multiple communication terminals are when adding Cellular Networks, by the honeycomb
Net gateway distributes IP address, and the Cellular Networks gateway is carried out by multiple access points in IP kernel heart net and the WLAN
Communication, the Cellular Networks gateway and described access point have identifier and have allocated IP address in advance respectively, it is characterised in that
Comprise the following steps：
Step 1：The communication terminal searches wireless lan channel, obtains described access point identifier；
Step 2：The communication terminal sends the first handover request, first switching by Cellular Networks chain road direction Cellular Networks gateway
The content of request includes described access point identifier；
Step 3：The Cellular Networks gateway receives first handover request from the cellular link, therefrom extracts described connect
Enter point identifier, and determine whether access point corresponding with described access point identifier has the ability to accommodate new traffic terminal, if nothing,
Then the Cellular Networks gateway sends the reply for forbidding switching by the cellular link to the communication terminal；Otherwise, into step
Rapid 4；
Step 4：The Cellular Networks gateway sends the first pre-switch to described access point by the IP kernel heart net and asked, described pre-
The content of handover request includes the identifier of communication terminal and the IP address of communication terminal；
Step 5：Described access point receives first pre-switch request from the IP kernel heart net, and from first pre-switch
Extracted in request and record the communication terminal IP address and the communications terminal identifiers, then sent to the Cellular Networks gateway
First pre-switch is responded；
Step 6：The Cellular Networks gateway receives first pre-switch response, then by the cellular link to the communication
Terminal, which is sent, represents to allow the first switching of switching to reply；Otherwise being sent to the communication terminal forbids switching to reply；
Step 7：The communication terminal extracts in being replied from first switching received and records the wireless of described access point
Interface IP, into step 8；
Step 8：The communication terminal starts to cache outgoing IP bags, and initiates association request to described access point；
Step 9：Described access point is received after the association request, and associated response is sent to the communication terminal；
Step 10：The communication terminal is received after the associated response, local IP route table is changed, by the cellular link
Priority is reduced, while newly-built wireless local area network link route entry, and the priority of the wireless local area network link is set
For highest, start to send IP bags；
In the Cellular Networks gateway or described access point, the communication terminal to service server send IP bags then set up with it is described
The related address camouflage table clause of terminal；Otherwise address camouflage table clause is not set up；
Switching when, if as pre-switch ask sender the Cellular Networks gateway or described access point set up with it is described
The related address camouflage table clause of terminal, then the duplicate of the address camouflage table clause related to the terminal can be by described
Pre-switch request is sent to described access point or the Cellular Networks gateway as pre-switch request recipient；If being used as pre-cut
The Cellular Networks gateway or described access point for changing request sender do not set up the address camouflage table bar related to the terminal
Mesh, then can be sent to the described access point or the Cellular Networks as pre-switch request recipient without address camouflage table clause
Gateway.
2. the method that Cellular Networks as claimed in claim 1 switch with WLAN, it is characterised in that also including step 11：
Receive in the stipulated time after the first pre-switch response, if the Cellular Networks gateway is received from described access point
First switching confirms that then the honeycomb gateway is automatic is labeled as the communication terminal to use Radio Link, and is connect described in increase
The communication terminal quantity of association of access point,
If the Cellular Networks gateway, which does not receive the first switching from described access point, confirms that the honeycomb gateway terminates
Processing.
3. the method that Cellular Networks as claimed in claim 1 switch with WLAN, it is characterised in that also including following from institute
State WLAN to the Cellular Networks switch the step of：
Step 21：When the communication terminal positioned at the WLAN judges to need switching, the communication terminal
Start to cache IP bags, until switching flow terminates；
Step 22：The communication terminal sends the second handover request to described access point；
Step 23：Described access point receives second handover request, then by the IP kernel heart net to the Cellular Networks net
Close and send the second pre-switch request, the second pre-switch request is at least whole including the communications terminal identifiers, the communication
Hold IP address and described access point identifier；
Step 24：The Cellular Networks gateway receives the second pre-switch request, then is taken out the communication terminal mark
Symbol and the communication terminal IP address；
Step 25：The Cellular Networks gateway sends the second pre-switch response to described access point；
Step 26：Described access point is received after second pre-switch response, by the wave point of described access point to described
Communication terminal, which is sent, represents to allow the second switching of switching to reply, into step 27；Otherwise switching flow is terminated；
Step 27：The communication terminal is being received after second switching replys, and changes local IP route table, and by the honeycomb
Network chain road routing priority rises to highest, and the 3rd handover request is sent by Cellular Networks gateway described in the Cellular Networks chain road direction,
Into step 28；
Step 28：The Cellular Networks gateway receives the 3rd handover request, then judges whether wrapped in the 3rd handover request
Containing the communications terminal identifiers and the communication terminal IP address obtained in step 24, comprising step 29 is then entered, no
The 3rd switching reply for forbidding switching mark is included comprising then being sent to the communication terminal, and terminates switching flow；
Step 29：The Cellular Networks gateway is sent comprising permission switching mark by communication terminal described in the Cellular Networks chain road direction
The 3rd switching reply；
Step 30：The communication terminal receive it is described comprising allowing the 3rd switching of switching mark to reply, then disconnect with it is described
The connection of access point, deletes the wireless local area network link route, IP bags is sent by the Cellular Networks link.
4. the method that Cellular Networks as claimed in claim 3 switch with WLAN, it is characterised in that also including step 30：Institute
Cellular Networks gateway is stated after the 3rd switching comprising permission switching mark is replied described in sending, is cut to described access point transmission second
Change confirmation；Described access point deletes the information of the communication terminal after the second switching confirmation is received.
5. the method that the Cellular Networks as described in claim 1 or 3 switch with WLAN, it is characterised in that
The Cellular Networks gateway and described access point, when pre-switch request is sent, are included in pre-switch request
There is the duplicate of former IP address and IP address of terminal identical entry；
If pretending entry duplicate comprising address in the pre-switch request that the Cellular Networks gateway is received, in the honeycomb
When described in the transmission of net gateway comprising the 3rd switching reply for allowing switching mark, the address is pretended into entry duplicate and is added to this
Way address pretends table；
If pretending table clause duplicate comprising address in the pre-switch request that described access point is received, in described access point hair
Send it is described expression allow association associated response when, by the address camouflage entry duplicate be added to local address camouflage table.
6. the method that the Cellular Networks as described in claim 1 or 3 switch with WLAN, it is characterised in that
The Cellular Networks gateway is to the IP bags that are received from the Cellular Networks link, using source IP address and source port number as index,
Up matching is carried out to local camouflage table, if it fails to match, a newly-built address pretends table clause, then according to described newly-built
Address pretends table clause, performs address camouflage；If the match is successful, according to the address camouflage table clause that the match is successful, perform ground
Location pretends；The IP bags obtained after the completion of address is pretended are sent to IP kernel heart net；
The Cellular Networks gateway first checked whether as IP-in-IP packages to the IP bags that are received from the IP kernel heart net,
Initial IP packet is solved if being IP-in-IP packages if the IP bags received from the IP kernel heart net, when the purpose of initial IP packet
When the corresponding terminals of IP just use Cellular Networks link, initial IP packet is sent to terminal by Cellular Networks link, works as initial IP packet
The corresponding terminals of purpose IP just use wireless local area network link when, initial IP packet is sent to correlation in the form of IP-in-IP
Access point；
If the IP bags received from the IP kernel heart net are not IP-in-IP packages, carry out ground with purpose IP and destination slogan
Location pretends the descending matching of table, if the match is successful, carries out the camouflage of solution address, then be sent to corresponding end by the Cellular Networks link
End, abandons the IP bags, processing terminates if it fails to match.
7. the method that the Cellular Networks as described in claim 1 or 3 switch with WLAN, it is characterised in that
Described access point is held to the IP bags received from the wireless local area network link using source IP address and source port number as index
Row address pretends the up matching of table, if it fails to match, and a newly-built address pretends table clause, is entered according to the newly-built entry
After row address camouflage, service server is sent to by the IP kernel heart net；If the match is successful, according to the entry that the match is successful
Perform after the camouflage of address, service server is sent to by the IP kernel heart network interface；
Described access point is to the IP bags that are received from the IP kernel heart net, if the bag of IP-in-IP forms, first solves initial IP
Bag, checks whether the purpose IP of initial IP packet is used by the terminal associated with oneself, if then passing through wireless local area network link
Terminal is sent to, if otherwise abandoning；If not the bag of IP-in-IP forms, then perform ground using purpose IP and destination slogan as index
Location pretends the descending matching of table, if it fails to match, abandons IP bags；If the match is successful, solution is performed according to the entry that the match is successful
Address pretends, and after the camouflage of solution address, checks purpose IP, if the corresponding terminals of purpose IP are associated with oneself, by described wireless
Area network link is sent to corresponding terminal, if the corresponding terminals of purpose IP are not associated with oneself, by IP bags with IP-in-IP shape
Formula is sent to Cellular Networks gateway by IP kernel heart net.
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| CN105744549B (en) * | 2016-02-03 | 2019-06-11 | 宇龙计算机通信科技(深圳)有限公司 | A kind of switching method of transmission path, terminal and system |
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| CN107872796B (en) * | 2016-09-26 | 2021-02-23 | 中国电信股份有限公司 | Authentication method and system for accessing terminal to WiFi and related equipment |
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| CN108271225B (en) * | 2017-01-03 | 2022-06-07 | 中兴通讯股份有限公司 | Network acquisition method and device |
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