CN103179621A - Method and system switching between cellular network and wireless local area network - Google Patents
Method and system switching between cellular network and wireless local area network Download PDFInfo
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- CN103179621A CN103179621A CN2011104362050A CN201110436205A CN103179621A CN 103179621 A CN103179621 A CN 103179621A CN 2011104362050 A CN2011104362050 A CN 2011104362050A CN 201110436205 A CN201110436205 A CN 201110436205A CN 103179621 A CN103179621 A CN 103179621A
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Abstract
The invention discloses a method achieving switching between a cellular network and a wireless local area network. The method achieving the switching between the cellular network and the wireless local area network includes that a communication terminal sends a switching request to a cellular network gateway; the cellular network gateway receives the switching request, extracts an identifier of an access point from the switching request and determines whether the access point is capable of accommodating a new communication terminal or not according to the identifier of the access point; if not, the cellular network gateway sends a no-switching reply to the communication terminal; otherwise, the access point sends an association response to the communication terminal; the communication terminal modifies a local IP (Internet Protocol) routing table and lowers a priority level of a cellular link after receiving the association response; and new routing entries of a wireless local area network link are created and a priority level of the wireless local area network link is set to be the highest at the same time to start to send IP packets. According to the method and a system switching between the cellular network and the wireless local area network, communication continuity in a switching process can be independent to application programs. In addition, a business server cannot feel the switching, so that communication connection before the switching can be maintained after the switching.
Description
Technical field
The present invention relates to a kind of method that communication terminal is freely switched between Cellular Networks and WLAN (wireless local area network), belong to wireless communication technology field.
Background technology
At present, Cellular Networks and WLAN (wireless local area network) are two separate networks, independently select access network by communication terminal, temporarily there is no can coordinate to control the method that communication terminal freely switches between two networks.Communication terminal withdraws from from a network, after adding new network, need to again obtain the network address, and after this will cause network to switch, original TCP/UDP communication can't keep.
The continuity of existing heterogeneous network handoff technique in order to guarantee to communicate by letter is mainly the communication quality when selecting high-quality candidate network to guarantee that heterogeneous network switches.For example; application for a patent for invention (the application number: 200810042875.2) that Huawei Tech Co., Ltd., Shanghai submitted on September 9th, 2008; propose network equipment and send switching type information to the access communications terminal; then accept the access communications terminal according to described switching type information carry out from the 3GPP2 residential quarter to the switching of non-3GPP2 residential quarter, thereby make the access communications terminal can select most suitable switching type to switch in non-3GPP2 network.Particularly for real time business and delay sensitive business, be convenient to it and in time select to optimize the switching type that switches, make it can fulfil access authentication and mandate ahead of schedule, and the wireless specific negotiation of target access system, layoutprocedure, reduce the time-delay of switching, improve performance, guaranteed the continuity of access communications terminal traffic.
Also having a kind of mode in prior art is to change address between heterogeneous network by the mapping relations of IP address, realizes the continuity of communication.(application number: introduced a kind of method and mobile communication terminal that packet service is provided when switching between heterogeneous network 200810166561.3), this mobile communication terminal comprises application module in the application for a patent for invention that Korea S SK Telecommunication Co., Ltd. submitted on October 17th, 2008; Communication module; And communication control module, the method comprises: distribute virtual IP address by communication control module to mobile communication terminal; Use this virtual IP address request grouped data to connect by application module; Connecting modulator-demodulator by communication control module by the first mobile communications network is connected to session the first mobile communications network and is assigned to an IP from it; Communication control module is converted to an IP with virtual IP address, transmits request by the first mobile communications network to service-specific server, and grouped data is sent to application module; Communication control module connects modulator-demodulator by the second mobile communications network session is connected to the second mobile communications network, and is assigned to the 2nd IP from it, the frame number of the frame that the application module storage receives from service-specific server at last; Communication control module is converted to the 2nd IP with virtual IP address, begins to receive grouped data from the next frame of this frame that receives at last, and transmits to application module the grouped data that receives.
In above-mentioned handoff technique, because the application module on terminal need to be mutual with communication control module, so generally application program must (need to record switching front from the last received frame number of service server through revising, might need to reconnect service server after switching), after increasing function, just can be used in this handoff technique.The practical application that this has just limited this handoff technique is difficult to generally be accepted.And from the terminal angle, communication connects; But from the angle of service server, before and after switching, service server can not keep same connection.Namely from service server, during switching, original connection disconnects, and again receives afterwards the connection request that once comes self terminal.Therefore, in this handoff technique, the function of service server is limited in data download service, and other business may not be supported.
Summary of the invention
The object of the present invention is to provide and a kind ofly can support all based on the business of ICP/IP protocol, be independent of application program and can keep the Cellular Networks of the continuity in handoff procedure and the method that WLAN (wireless local area network) is switched.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of method that Cellular Networks and WLAN (wireless local area network) are switched, a plurality of communication terminals are when adding Cellular Networks, by described Cellular Networks gateway distributing IP address, described Cellular Networks gateway communicates by a plurality of access points in IP kernel heart net and described WLAN (wireless local area network), described Cellular Networks gateway and described access point have respectively identifier and have allocated the IP address in advance, it is characterized in that comprising the following steps:
Step 1: described communication terminal search wireless lan channel obtains described Access Point Identifier;
Step 2: described communication terminal sends the first handover request by Cellular Networks chain road direction Cellular Networks gateway, and the content of described the first handover request comprises described Access Point Identifier;
Step 3: described Cellular Networks gateway receives described the first handover request from described cellular link, therefrom extract described Access Point Identifier, and determine whether the access point corresponding with described Access Point Identifier has the ability to hold the new traffic terminal, if nothing, described Cellular Networks gateway sends to described communication terminal by described cellular link and forbids the reply of switching; Otherwise, enter step 4;
Step 4: described Cellular Networks gateway sends the first pre-switch request by described IP kernel heart net to described access point, and the content of described pre-switch request comprises the IP address of identifier and the communication terminal of communication terminal;
Step 5: described access point receives described the first pre-switch request from described IP kernel heart net, and extracts and record described communication terminal IP address and described communications terminal identifiers from described the first pre-switch request, then sends the first pre-switch response;
Step 6: described Cellular Networks gateway receives described the first pre-switch response, passes through the first switching reply that described cellular link switches to described communication terminal transmission expression permission; Reply otherwise send to forbid switching to described communication terminal;
Step 7: described communication terminal extracts and records the wave point IP of described access point from described the first switching that receives is replied, enter step 8;
Step 8: described communication terminal begins buffer memory and sends out the IP bag outward, and initiates related request to described access point;
Step 9: described access point sends associated response to described communication terminal after receiving described related request;
Step 10: after described communication terminal is received described associated response, revise local IP route table, with the priority reduction of described cellular link, newly-built WLAN (wireless local area network) link route entry simultaneously, and the priority of described WLAN (wireless local area network) link is set to the highlyest, begins to send IP bag.
In the present invention, application program does not need with other modules mutual, general application program not need to revise, and can directly use handoff functionality, realizes continuity in handoff procedure so be independent of application program.In addition, service server is imperceptible to switch, after the communication connection before switching can remain to switching.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is schematic network structure of the present invention.
Fig. 2 is Cellular Networks gateway module schematic diagram of the present invention.
Fig. 3 is wireless local network connecting point module diagram of the present invention.
Fig. 4 is the flow chart that switches from Cellular Networks to WLAN (wireless local area network) of the present invention.
Fig. 5 is the flow chart that switches from WLAN (wireless local area network) to Cellular Networks of the present invention.
Embodiment
Below, describe concrete technical scheme of the present invention with GSM cellular network and WLAN (wireless local area network) as the representative of heterogeneous network.But the present invention can be applied to the switching of Cellular Networks and WLAN (wireless local area network), and wherein Cellular Networks is not limited to GSM, can be the network of the employing honeycombs such as CDMA or 3G net.
As shown in Figure 1, the present invention is applied to the switching between GSM cellular network and WLAN (wireless local area network).In network configuration shown in Figure 1, the GSM Cellular Networks comprises Cellular Networks gateway 1, a plurality of base station controllers (BSC) that are connected with the Cellular Networks gateway, and a plurality of base stations (BS) that are connected with base station controller.Wireless communication terminal is realized communicating by letter with wireless mode and base station.In WLAN (wireless local area network) shown in Figure 1, IP kernel heart net directly is connected with the Cellular Networks gateway, and a plurality of WAP (wireless access point) (AP) 2 connect IP kernel heart net and can communicate by letter with communication terminal 3.
In the present invention, Cellular Networks gateway 1 directly accesses IP kernel heart net, has IP layer routing function, can the process IP bag.As shown in Figure 2, the Cellular Networks gateway comprises network information management module 11, Cellular Networks IP packet handing module 12, Cellular Networks address camouflage module 13 and gateway handoff control module 14.
Wherein, the network information management module is safeguarded an IP address pool 110, and the state of each IP address in the recording address pond: idle, taken, be access in a little and take by communication terminal.IP address in this address pool is assigned to the wave point that communication terminal used or distributed to access point and uses.Address in the pond is all the not directly private ip of addressing of Internet, and is in same continuous address field.Address in the pond is divided into three parts: first comprises an IP address, allocates in advance before network is set up, as the cellular link IP of honeycomb gateway; Second portion comprises several IP address, allocates in advance before network is set up, as the wave point IP of access point; Third part comprises several IP address, distributes to communication terminal at communication terminal during in the Cellular Networks network registration, as communication terminal IP, and returns to the IP address pool when communication terminal is nullified.
In addition, the network information management module is also safeguarded gateway end message storehouse 111 and access-in point information storehouse 112.In the 111 record nets of end message storehouse, the state of all communication terminals, be used for auxiliary the switching.The entry contents of gateway terminal information bank 111 comprises: link (value can be: Cellular Networks link or WLAN (wireless local area network) link), the APN when communication terminal uses the WLAN (wireless local area network) link that communications terminal identifiers, communication terminal (privately owned) IP address, communication terminal are using now.In the 112 record nets of access-in point information storehouse, the state of all WAP (wireless access point), be used for auxiliary the switching.The entry contents in access-in point information storehouse comprises: Access Point Identifier, wireline interface IP address, wave point IP address, the communication terminal quantity related with access point.
Cellular Networks IP packet handing module 12 is used for providing the IP package to conciliate machine contracting system.It can be sealed IP and put in new IP bag, generates the package of IP-in-IP form, and can solve initial IP packet from the package of IP-in-IP form.
Cellular Networks address camouflage module 13, be used for cellular address camouflage table 130 of maintenance, record former IP, former port numbers, camouflage IP, camouflage port numbers and service time this entry the last time, and according to the recorded information of cellular address camouflage table 130, executive address camouflage function.When communicating by letter with service server, new port numbers of the each use of terminal just sets up a new address camouflage table clause.Former IP is for camouflage IP, and the terminal IP before camouflage is exactly former IP.
For the Cellular Networks gateway, under initial condition, endless networks, and the address camouflage table of Cellular Networks gateway is for empty.The source of the address camouflage table clause of Cellular Networks gateway has two:
1) terminal switches to Cellular Networks and handover success from WLAN (wireless local area network), originally be positioned at the address relevant to this terminal camouflage table clause (if having such entry) on wireless local network connecting point, will be copied to Cellular Networks gateway (by the pre-switch instruction in handoff procedure) and be added to the address camouflage table of Cellular Networks gateway.
2) when the terminal of using the Cellular Networks link sends the IP bag to the service server that is positioned at IP kernel heart net, the Cellular Networks gateway removes to inquire about the address camouflage table on the Cellular Networks gateway take the source IP of IP bag and source port number as index, when not having such entry (the former IP address of entry equals the source address of IP bag, the former port numbers of entry equals the source port number of IP bag) in address camouflage table, the Cellular Networks gateway can newly-built address camouflage table clause.
Same, for wireless local network connecting point, access point is just starting when successful, and its address camouflage table is for empty.The source of the address camouflage table clause of wireless local network connecting point has two:
1) terminal switches to WLAN (wireless local area network) and handover success from Cellular Networks, originally be positioned at the address relevant to this terminal camouflage table clause (if having such entry) on the Cellular Networks gateway, will be copied to wireless local network connecting point (by the pre-switch instruction in handoff procedure) and be added to the address camouflage table of Cellular Networks gateway.
2) when the terminal of using the WLAN (wireless local area network) link sends the IP bag to the service server that is positioned at IP kernel heart net, wireless local network connecting point removes to inquire about the address camouflage table on wireless local network connecting point take the source IP of IP bag and source port number as index, when not having such entry (the former IP address of entry equals the source address of IP bag, the former port numbers of entry equals the source port number of IP bag) in address camouflage table, wireless local network connecting point can newly-built address camouflage table clause.
Address camouflage table clause is not corresponding one by one with terminal, but corresponding with " IP address and port ".For example, a terminal of using the Cellular Networks link, its IP address is IPE1, is using port PORTE1 to connect service server 1, uses simultaneously port PORTE2 to connect service server 2.The IP kernel heart network interface address of Cellular Networks gateway be IPG the address camouflage table on the Cellular Networks gateway should have such entry.
| Former IP | Former port | IP after camouflage | Port after camouflage |
| IPE1 | PORTE1 | IPG | Certain port A on Cellular Networks |
| IPE1 | PORTE2 | IPG | Certain port B on Cellular Networks |
And, even if terminal is used the Cellular Networks link, but do not send the IP bag to service server all the time, the Cellular Networks gateway can not set up the address camouflage table clause relevant to this terminal yet.
In like manner, even if terminal is used the WLAN (wireless local area network) link, but do not send the IP bag to service server all the time, wireless local network connecting point can not set up the address camouflage table clause relevant to this terminal yet.That is, the behavior of setting up address camouflage table clause of Cellular Networks gateway or wireless local network connecting point all sends the IP bag by terminal to service server and triggers.
Gateway handoff control module 14, carry out information interaction with network information management module 11, Cellular Networks IP packet handing module 12 and Cellular Networks camouflage module 13, be used for and communication terminal 3 and access point 2 between to carry out switching control signaling mutual, in coordinating net, various device is completed switching flow, and manages other what's news.
In the present invention, wireless local network connecting point 2 directly accesses IP kernel heart net, has IP layer routing function, can the process IP bag.WAP (wireless access point) has unique Access Point Identifier.As shown in Figure 3, wireless local network connecting point comprises end message administration module 21, access point IP packet handing module 22, access point address camouflage module 23 and access point switching controls module 24.Be described as follows below in conjunction with Fig. 3:
End message administration module 21 be used for to be safeguarded an access point end message storehouse 210, is recorded in the communication terminal state in local wireless local area network, is used for auxiliary the switching.Entry contents in access point end message storehouse 210 comprises the current communications terminal identifiers related with access point, IP address.
Access point IP packet handing module 22 is used for providing the IP package to conciliate machine contracting system, IP can be sealed and put in new IP bag, generates the package of IP-in-IP form, and can solve initial IP packet from the package of IP-in-IP form.
Access point address camouflage module 23, be used for safeguarding an access point address camouflage table 230, record former IP, former port numbers, camouflage IP, the last time of using of camouflage port numbers and this entry, and according to the recorded information of access point address camouflage table 230, executive address camouflage function.
Access point switching controls module 24, carry out information interaction with end message administration module 21, access point IP packet handing module 22 and access point address camouflage module 23, be used for and Cellular Networks gateway 1 and communication terminal 3 between to carry out switching control signaling mutual, accept the control command of Cellular Networks gateway 1, complete switching flow, and manage other two what's news.
Still can keep the mechanism of communicating by letter when illustrating that below in conjunction with Fig. 4 and Fig. 5 communication terminal switches between heterogeneous network.The method that communication terminal provided by the present invention switches between Cellular Networks and WLAN (wireless local area network) comprises the situation that situation that communication terminal switches from from Cellular Networks to WLAN (wireless local area network) and communication terminal switch from WLAN (wireless local area network) to Cellular Networks.Communication terminal of the present invention 3 is initial when networking, be all by the Cellular Networks link connection to Cellular Networks gateway 1, the Cellular Networks gateway distributes an idle address to communication terminal 3 in 1 secondary IP address pond.Communication terminal 3 is in the communication of IP layer, uses all the time this IP address, and do not distinguish the link of concrete use.
At first in conjunction with Fig. 4, the situation that the communication terminal in first embodiment of the invention switches from Cellular Networks to WLAN (wireless local area network) is described, it comprises the following steps.
Step 1: communication terminal 3 is according to the radio environment measurements result, the signal level value of judging in the WLAN (wireless local area network) of current location reaches predefined threshold values, communication terminal 3 search wireless lan channels obtain the identifier as the access point of access side (WLAN (wireless local area network)).
Afterwards, according to a kind of mechanism, communication terminal 3 selects an access point as target access.This mechanism can be existing in protocol of wireless local area network, can be also new definition.Typically, when having a plurality of access points, can select wherein the maximum access point of signal strength signal intensity as target access.
Initiating the trigger event of network handover request, can be that aforementioned level value reaches threshold values and triggers, also can trigger according to the network QoS value, or other usual manners.
Step 2: communication terminal 3 sends handover request 1 by Cellular Networks chain road direction Cellular Networks gateway 1.The content of handover request 1 comprises 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 extract Access Point Identifier, gateway handoff control module 14 determines by the access-in point information storehouse 112 in requester network information management module 11 whether the corresponding access point of objective network has the ability to hold the new traffic terminal.If nothing, Cellular Networks gateway 1 sends to communication terminal 3 by cellular link and forbids the reply 1 of switching; Otherwise, enter step 4.
At this, the accessible communication terminal quantity of each access point is predefined.Record all wireless access dotted state in the local access point information bank of Cellular Networks gateway.According to the Access Point Identifier that comprises in pre-switch request 1, the gateway handoff control module 14 of honeycomb gateway can be found the state of corresponding WAP (wireless access point), obtains wireline interface IP, the wave point IP of this access point, related with access point communication terminal quantity.By inquiry local access point information bank 112, gateway handoff control module 14 has obtained related with access point communication terminal quantity.If related with access point communication terminal quantity does not reach limit value, the gateway handoff control module 14 of honeycomb gateway is judged as this access point and can holds the new traffic terminal, enters step 4.If related with access point communication terminal quantity has reached limit value, the gateway handoff control module 14 of honeycomb gateway is judged as this access point and can not holds the new traffic terminal, sends and forbids the reply 1 of switching.
After communication terminal 3 is received the reply 1 of forbidding switching, two schemes can be arranged.A kind of is to continue to use the Cellular Networks link; Another kind is again second largest WAP (wireless access point) of search signal level value, and switches to second largest WAP (wireless access point) of this level value by the Cellular Networks gateway requests.The Cellular Networks gateway judges similarly whether this access point can hold the new traffic terminal, and sends the reply of forbidding or allowing to switch.By that analogy, can hold the new traffic terminal until the Cellular Networks gateway is judged the access point of communication terminal request switching, enter step 4; Perhaps the access point of all signal strength signal intensities more than threshold values all attempted asking connection complete by communication terminal, and terminal continues to use the Cellular Networks link.
Step 4: Cellular Networks gateway 1 sends pre-switch request 1 by IP kernel heart net to access point 2.The content of pre-switch request 1 comprises communications terminal identifiers and communication terminal IP address.The cellular address camouflage module 13 of Cellular Networks gateway 1 is according to communication terminal IP address, and the inquire address camouflage is shown.If have such entry in address camouflage table, the former IP address of namely preserving in entry is identical with the IP address of terminal that request is switched, the switching controls module 14 of Cellular Networks gateway 1 is added to the duplicate of all these entries in pre-switch request 1 so, sends to together access point.
Step 5: WAP (wireless access point) 2 receives pre-switch request 1 from Cellular Networks gateway 1 from IP kernel heart net, and extract and recording communication terminal former IP address and communications terminal identifiers from pre-switch request 1, if comprise the entry duplicate of address camouflage table in the pre-switch request, keep in these duplicates.Send pre-switch response 1 to Cellular Networks gateway 1 again.
Step 6: Cellular Networks gateway 1 receives the pre-switch response 1 of access point 2 in stand-by period t2, sends to allow to switch to communication terminal 3 by cellular link and replys 1; If do not receive the reply of access point in stand-by period t 2, gateway handoff control module 14 sends to forbid switching to communication terminal 3 by cellular link and replys 1.The content that allows to switch reply 1 comprises Access Point Identifier and access point wave point IP.
Step 7: if the reply of honeycomb gateway do not received in stand-by period t1 by communication terminal or what receive is to forbid switch replying 1, thinking can have following two schemes by handoff failure: 1) continue to use the Cellular Networks link; 2) search channel is sought new target access again.
Switch reply 1 if received the permission that the Cellular Networks gateway sends in stand-by period t1, communication terminal is replied 1 from the permission switching that receives and is extracted Access Point Identifier and access point wave point IP, judge according to Access Point Identifier, whether this access point is exactly that related access point is set up in own request before, if enter step 8.
Step 8: communication terminal begins buffer memory and sends out the IP bag outward.Simultaneously, communication terminal as a parameter, according to MAC Layer in Wireless agreement (typical in IEEE 802.11), is initiated related request to wireless local network connecting point with Access Point Identifier.This process is completed under the IP layer.
Step 9: access point receives the related request of communication terminal MAC layer from wave point, is confirmed whether to be to be switched communication terminal according to the communications terminal identifiers in request.
If the communications terminal identifiers that comprises in related request is consistent with the communications terminal identifiers of record in step 5, access point is confirmed to be to be switched communication terminal, accept the association request of communication terminal, send expression and accept related associated response, and communication terminal former IP address and communications terminal identifiers are added in local communication end message storehouse, if temporary in step 5 have the address to pretend the table clause duplicate, these entry duplicates are added to local address camouflage table, and send switching confirmation 1 by IP kernel heart net to the Cellular Networks gateway, finish to switch.If there is no duplicate, directly send to switch to the Cellular Networks gateway by IP kernel heart net and confirm 1.
If inconsistent with the communications terminal identifiers of record in step 5, the access point to be switched communication terminal that really admits a fault, refuse the association request of communication terminal.If sending pre-switch response 1 rear t3 in the time, do not complete the MAC layer related, the terminal identifier and the IP address of terminal that record in delete step 5, and in delete step 5, the temporary address corresponding with this terminal pretends the table clause duplicate, finishes to switch.The aforementioned MAC layer of not completing is related, comprises two kinds of situations: do not receive association request or the related failure of communication terminal MAC layer.
Step 10: after communication terminal receives that related associated response is accepted in the expression of access point, communication terminal utilizes the switching controls module to revise local IP route table, the priority of cellular link is reduced, newly-built WLAN (wireless local area network) link route entry of while, and the priority of WLAN (wireless local area network) link is set to the highest.The preferential transmission of IP bag with buffer memory stops buffer memory IP bag, and begins normal the transmission.
Step 11: access point 2 sends to Cellular Networks gateway 1 the switching confirmation 1 that the expression communication terminal has switched to access point; Cellular Networks gateway 1 is after having sent permission switching reply 1 to communication terminal 3, if (namely at the appointed time, in receiving from the time t3 after the pre-switch response 1 of access point) receive from the IP kernel heart net switching confirmation 1 that access point 2 is sent, the corresponding communication terminal in the communication terminal information storehouse is labeled as the use Radio Link, the related communication terminal quantity of this access point in increase access-in point information storehouse, deletion local address camouflage table IP address, the Central Plains entry identical with IP address of terminal completed switching; If not receiving to switch confirms 1, do not do the aforementioned operation of using Radio Link, the related communication terminal quantity of increase, deletion respective entries that communication terminal is labeled as.
Communication terminal is related with the request between access point-process of related reply, and be by WLAN MAC Protocol (as IEEE 802.11) definition, do not describe in detail at this.But the switching controls module of communication terminal can get the executing state of related request: be successfully associated or failure.Use the switching controls module to revise local IP route table when being successfully associated.
To step 10, the communication terminal that is positioned at the Cellular Networks gateway has switched to WLAN (wireless local area network) by above-mentioned steps 1.Afterwards, the private IP address that when communication terminal utilizes network registration all the time, the Cellular Networks gateway distributes is communicated by letter with wireless local network connecting point, address camouflage module by access point is pretended the IP bag executive address from communication terminal according to address camouflage table, then the IP bag after the camouflage of address is sent to IP kernel heart net.The pseudo-process of assembling in address is, inquire about local address camouflage table with source address and source port number that the IP from communication terminal that receives wraps, if the coupling entry is arranged, the former IP that is entry equals the source IP of IP bag, the former port numbers of entry equals IP bag source port number, IP is wrapped the IP after source IP replaces with the camouflage of coupling in entry, the source port number of IP bag is replaced with the camouflage rear end slogan of coupling entry; If without the coupling entry, a newly-built address pretends entry, the former port numbers that the former IP of entry is filled to source IP, the entry of IP bag is filled to IP after the camouflage of the source port number of IP bag, entry and is filled to camouflage rear end slogan that access point IP kernel heart net connects IP, entry and is filled to the current wireless access point and there is no the arbitrary end slogan that uses, re-uses afterwards source IP and the replacement of source port number that this entry is carried out the IP bag) the such continuity of communication terminal in the switching from Cellular Networks to WLAN (wireless local area network) that just guaranteed.
Below in conjunction with Fig. 5, the situation that the communication terminal in first embodiment of the invention switches from WLAN (wireless local area network) to Cellular Networks is described, it comprises the following steps.
Step 21: the signal level value that the WLAN (wireless local area network) of communicating by letter now detected when communication terminal is lower than threshold values the time, and communication terminal begins buffer memory and sends out the IP bag outward, until switching flow finishes.
Step 22: communication terminal sends handover request 2 by the WLAN (wireless local area network) link to access point.
Step 23: access point receives the handover request 2 of communication terminal from wave point, sends pre-switch request 2 by IP kernel heart net to the Cellular Networks gateway.Pre-switch request 2 comprises communications terminal identifiers and the former IP of communication terminal address, Access Point Identifier.In the address of access point camouflage table, when having the such entry former IP of the entry (address identical with IP address of terminal), the duplicate of all these entries will be added in pre-switch request 2, send to together the Cellular Networks gateway.
All the time not do not communicate by letter to service server or relevant address camouflage table clause all when expired and deleted, does not copy with regard to not having address camouflage article purpose with terminal in terminal.
Step 24: the Cellular Networks gateway receives from the IP kernel heart net pre-switch request 2 that access point is sent, take out communications terminal identifiers and the former IP of communication terminal address from pre-switch request 2, if comprise address camouflage table clause duplicate in pre-switch request 2, temporary these duplicates.
Step 25: Cellular Networks gateway 1 sends pre-switch response 2 to access point 2.
Step 26: in stand-by period t6, send to allow to switch to communication terminal by wave point if access point is received pre-switch response 2 and reply 2, enter step 27; If do not receive pre-switch response 2, send to forbid switching to communication terminal and reply 2, and finish switching flow.
Step 27: in stand-by period t4, reply 2 if communication terminal is received to switch from the permission of access point, revise local IP route table, and rise to Cellular Networks link route priority the highest, send handover request 3 by Cellular Networks chain road direction Cellular Networks gateway, enter step 28; Do not reply or what receive is to forbid switching replying 2 if receive, communication terminal is thought handoff failure, two schemes can be arranged: 1) recover WLAN (wireless local area network) route priority to the highest, again initiate handover request to access point, or continue to use this access point; 2) terminal resets, and attempts again adding network by the Cellular Networks link.
Step 28: in stand-by period t7, if the Cellular Networks gateway is received handover request 3 from communication terminal from cellular link, the honeycomb gateway inspection send the communications terminal identifiers of this handover request 3 and IP address whether with step 24 in pre-switch request 2 in the communications terminal identifiers obtained identical with communication terminal IP address, the identical step 29 that enters, not identical the transmission comprises the switching reply 3 of forbidding switching mark, finishes switching flow.
In stand-by period t7, if honeycomb gateway is not received handover request 3 from communication terminal from cellular link, the blotter of setting up in delete step 14 (communications terminal identifiers and IP address), and deletion temporary with this terminal relative address camouflage table duplicate, finish switching flow.
Step 29: the Cellular Networks gateway sends to communication terminal by cellular link and comprises the switching reply 3 that allows switching mark, corresponding communication terminal in local communication end message storehouse is labeled as uses the Cellular Networks link, to be added to local address camouflage table with this terminal relative address camouflage table duplicate, send to switch to the former association access point of terminal by IP kernel heart net and confirm 2, and the related communication terminal quantity of former association access point in the local access point information bank of minimizing Cellular Networks gateway, complete switching.
Step 30: in stand-by period t5, if communication terminal 3 receives from cellular link the switching that allows switching mark from comprising of Cellular Networks gateway 1 and replys 3, disconnect and being connected with the MAC of access point 2, deletion WLAN (wireless local area network) link route, the buffer memory bag is sent to the Cellular Networks gateway by the Cellular Networks link, complete switching; If receiving, communication terminal 3 switch not reply 3 or what receive is to comprise the switching of forbidding switching mark to reply 3, think handoff failure, two schemes can be arranged: 1) recover WLAN (wireless local area network) route priority to the highest, again initiate handover request to access point, or continue to use this access point; 2) terminal resets, and attempts again adding network by the Cellular Networks link.
Step 31: wireless local network connecting point 2 is after the switching confirmation 2 that receives from Cellular Networks gateway 1, with the deletion from local access point end message storehouse 210 of this end message, with the entry deletion identical with terminal IP of camouflage IP address, table 230 Central Plains, access point address, complete switching.
Cellular Networks gateway and the wireless local network connecting point maintaining method to address camouflage table:
1. the address pretends the table clause content
Cellular Networks gateway and wireless local network connecting point are safeguarded respectively the address camouflage table of oneself, and the entry contents of an address camouflage table comprises: the IP after former IP, former port numbers, camouflage, the port numbers after camouflage, the last time of using this entry.
2. the address pretends the up coupling of table
With two tuples that a given IP address and given side slogan form, removal search address camouflage table.When there being an entry, when former IP and former port numbers identical with given IP was identical with the given side slogan, the match is successful, otherwise it fails to match.
3. descending coupling is shown in the address camouflage
With two tuples that a given IP address and given side slogan form, removal search address camouflage table.When there being an entry, the IP after camouflage identical with given IP and pretend after port numbers when identical with the given side slogan, the match is successful, otherwise it fails to match.
4. address camouflage
The purpose IP of IP bag is replaced with IP after camouflage in address camouflage table clause, the destination slogan of IP bag is replaced with port numbers after camouflage in address camouflage table clause.Upgrading entry service time is the current time.
5. separate the address camouflage
The purpose IP of IP bag is replaced with former IP in address camouflage table clause, the destination slogan of IP bag is replaced with former port numbers in address camouflage table clause.Upgrading entry service time is the current time.
6. the Cellular Networks gateway camouflage entry that Adds Address
Two tuples that a given IP address and port numbers form, newly-built address camouflage table clause, the former IP of entry is filled to given IP, former port numbers is filled to given port numbers, IP after the camouflage of entry is filled to the core network interface IP of Cellular Networks gateway, port numbers after the camouflage of entry is filled to unappropriated arbitrary end slogan on current Cellular Networks gateway, is initialized as recently the current time service time.
7. Cellular Networks gateway deletion address pretends table clause
Cellular Networks gateway intermittent scanning local address camouflage table if an entry is not used (be the current time surpass a threshold values with the difference of entry service time) in continuing for some time, is deleted this entry.
8. the wireless local network connecting point camouflage table clause that Adds Address
Two tuples that a given IP address and port numbers form, newly-built address camouflage table clause, the former IP of entry is filled to given IP, former port numbers is filled to given port numbers, IP after the camouflage of entry is filled to the core network interface IP of wireless local network connecting point, port numbers after the camouflage of entry is filled to unappropriated arbitrary end slogan on current local access point, is initialized as recently the current time service time.
9. wireless local network connecting point deletion address pretends table clause:
Each entry of the address camouflage table of wireless local network connecting point has the variable of service time record the last time, if an entry is not used in continuing for some time, with this entry deletion.
Herein, " use " refers to, has a territory to be used for recording entry service time in address camouflage table clause.Use means according to this entry carries out the primary address conversion.Take the Cellular Networks gateway as example, after receiving the IP bag from the Cellular Networks link, address camouflage table on take the source address of IP bag and source port number as search index Cellular Networks gateway, if mate respectively with former IP and the former port numbers of certain entry, according to source address and the source port of entry substitute I P bag, be the current time service time of upgrading simultaneously this entry; After receiving the IP bag from core network interface, destination address and destination slogan with the IP bag remove inquire address camouflage table, if mate respectively with IP after the camouflage of certain entry and the port numbers after camouflage, according to destination address and the destination slogan of entry substitute I P bag, be the current time service time of upgrading simultaneously this entry.Wireless local network connecting point in like manner.
The below introduces Cellular Networks gateway and wireless local network connecting point to the processing method of the IP bag that receives.
At first the processing method that the Cellular Networks gateway wraps the IP that receives from the Cellular Networks link is described, it comprises the steps that A1 is to steps A 5.
A1) according to source IP address inquiry local information table, if terminal corresponding to this source IP address used the Cellular Networks link, execution in step A3); If corresponding terminal is being used WLAN (wireless local area network) link, execution in step A2;
A2) in the local information storehouse, terminal label that this IP address is corresponding is for using the Cellular Networks link, and to corresponding access point transmitting terminal information deletion notice, comprises identifier and the IP address of terminal in end message deletion notice, afterwards execution in step A3).
A3) take the source IP address of the IP that receives from Cellular Networks link bag and source port number as index, camouflage table in this locality is carried out up coupling, if it fails to match execution in step A4); The match is successful execution in step AS).
A4) take the source IP address of the IP that receives from Cellular Networks link bag and source port number as parameter, newly-built address camouflage table clause.This entry namely becomes the coupling entry.Execution in step AS).
AS) the address camouflage table clause according to coupling pretends IP bag executive address, and new IP bag is sent to IP kernel heart net.
Secondly, the processing method that the Cellular Networks gateway wraps the IP that receives from IP kernel heart net is described, it comprises the steps that B1 is to step B6.
B1) check whether be the IP-in-IP package.If carry out B2), otherwise carry out B5).
B2) solve original packed IP bag, and according to the purpose IP address lookup local information storehouse of initial IP packet, check the link that terminal corresponding to this IP used, if be the Cellular Networks link, carry out B3); If be the WLAN (wireless local area network) link, carry out B4); Other situations abandon this IP bag, and processing finishes.
B3) the IP bag is sent to terminal by the Cellular Networks link, processing finishes.
B4) inquiry local information storehouse obtains the IP kernel heart network interface address of the access point of this communication terminal association, and the IP bag is sent to relevant access point with the IP-in-IP form, and processing finishes.
B5) use purpose IP and the destination slogan of IP bag to carry out the descending coupling of address camouflage table, carry out B6 if the match is successful), it fails to match abandons this IP bag, and processing finishes.
B6) address according to coupling pretends table clause, the IP bag that receives is separated the address camouflage, purpose IP address lookup local information table according to new IP bag, if this communication terminal corresponding to IP address is using the Cellular Networks link, this IP bag is sent to terminal by the Cellular Networks link, processing finishes; If using the WLAN (wireless local area network) link, carry out B4); Other situations abandon this IP bag, and processing finishes.
The processing method that wireless local network connecting point wraps the IP that receives from the WLAN (wireless local area network) link is described again, and it comprises the steps that C1 is to step C3.
C1) take the source IP address of IP bag and source port number as the up coupling of index executive address camouflage table.If the coupling entry is arranged, carry out C3); Otherwise carry out C2).
C2) take the source IP address of IP bag and source port number as parameter, newly-built address camouflage table clause.This entry namely becomes the coupling entry.Carry out C3).
C3) the IP bag is sent to terminal by the Cellular Networks link, processing finishes.
The processing method that wireless local network connecting point wraps the IP that receives from IP kernel heart net is described at last, and it comprises the steps D1 to D6.
D1) whether the access point inspection is the IP-in-IP package.If carry out D2); Otherwise carry out D4).
D2) access point attempts solving original packed IP bag, and according to the purpose IP address lookup local information storehouse of initial IP packet, whether judges this terminal with own related, if by the WLAN (wireless local area network) link, the IP bag is sent to this terminal, and the processing end; Otherwise carry out D3).
D3) access point abandons the IP bag, and processing finishes.
D4) access point take the purpose IP of IP bag and destination slogan as the descending coupling of index executive address camouflage table, if it fails to match, abandons the IP bag, and processing finishes; If the match is successful, carry out D5).
D5) access point is carried out the IP bag and is separated the address camouflage, and according to the purpose IP inquiry local information storehouse of new IP bag, if purpose IP counterpart terminal with own related, sends to terminal by the WLAN (wireless local area network) link with the IP bag, processing finishes; Otherwise carry out D6);
D6) access point sends to the Cellular Networks gateway with the form that IP wraps with IP-in-IP by IP kernel heart net, and processing finishes.
Above method and system to Cellular Networks provided by the present invention and WLAN (wireless local area network) switching have been described in detail.To those skilled in the art, any apparent change of under the prerequisite that does not deviate from connotation of the present invention, it being done all will consist of infringement of patent right of the present invention, will bear corresponding legal liabilities.
Claims (10)
1. the method switched of a Cellular Networks and WLAN (wireless local area network), a plurality of communication terminals are when adding Cellular Networks, by described Cellular Networks gateway distributing IP address, described Cellular Networks gateway communicates by a plurality of access points in IP kernel heart net and described WLAN (wireless local area network), described Cellular Networks gateway and described access point have respectively identifier and have allocated the IP address in advance, it is characterized in that comprising the following steps:
Step 1: described communication terminal search wireless lan channel obtains described Access Point Identifier;
Step 2: described communication terminal sends the first handover request by Cellular Networks chain road direction Cellular Networks gateway, and the content of described the first handover request comprises described Access Point Identifier;
Step 3: described Cellular Networks gateway receives described the first handover request from described cellular link, therefrom extract described Access Point Identifier, and determine whether the access point corresponding with described Access Point Identifier has the ability to hold the new traffic terminal, if nothing, described Cellular Networks gateway sends to described communication terminal by described cellular link and forbids the reply of switching; Otherwise, enter step 4;
Step 4: described Cellular Networks gateway sends the first pre-switch request by described IP kernel heart net to described access point, and the content of described pre-switch request comprises the IP address of identifier and the communication terminal of communication terminal;
Step 5: described access point receives described the first pre-switch request from described IP kernel heart net, and extract and record described communication terminal IP address and described communications terminal identifiers from described the first pre-switch request, then send the first pre-switch response to described Cellular Networks gateway;
Step 6: described Cellular Networks gateway receives described the first pre-switch response, passes through the first switching reply that described cellular link switches to described communication terminal transmission expression permission; Reply otherwise send to forbid switching to described communication terminal;
Step 7: described communication terminal extracts and records the wave point IP of described access point from described the first switching that receives is replied, enter step 8;
Step 8: described communication terminal begins buffer memory and sends out the IP bag outward, and initiates related request to described access point;
Step 9: described access point sends associated response to described communication terminal after receiving described related request;
Step 10: after described communication terminal is received described associated response, revise local IP route table, with the priority reduction of described cellular link, newly-built WLAN (wireless local area network) link route entry simultaneously, and the priority of described WLAN (wireless local area network) link is set to the highlyest, begins to send IP bag.
2. the method for Cellular Networks as claimed in claim 1 and WLAN (wireless local area network) switching, is characterized in that,
Also comprise step 11: in the stipulated time after receiving described the first pre-switch response, if receiving to switch from first of described access point, described Cellular Networks gateway confirms, described honeycomb gateway is labeled as the use Radio Link with described communication terminal automatically, and increase the related communication terminal quantity of described access point
If receiving to switch from first of described access point, described Cellular Networks gateway do not confirm, described honeycomb gateway end process.
3. the method for Cellular Networks according to claim 1 and WLAN (wireless local area network) switching, is characterized in that,
Also comprise the following step of switching to described Cellular Networks from described WLAN (wireless local area network):
Step 21: when the described communication terminal judgement that is positioned at described WLAN (wireless local area network) needed to switch, described communication terminal began buffer memory IP bag, until switching flow finishes;
Step 22: described communication terminal sends the second handover request to described access point;
Step 23: described access point receives described the second handover request, send described the second pre-switch request by described IP kernel heart net to described Cellular Networks gateway, described the second pre-switch request comprises described communications terminal identifiers, described communication terminal IP address and described Access Point Identifier at least;
Step 24: described Cellular Networks gateway receives described the second pre-switch request, therefrom takes out described communications terminal identifiers and described communication terminal IP address;
Step 25: described Cellular Networks gateway sends the second pre-switch response to described access point;
Step 26: after described access point receives that described the second pre-switch responds, reply to the second switching that described communication terminal sends expression permission switching by the wave point of described access point, enter step 27; Otherwise end switching flow;
Step 27: described communication terminal is after receiving that described the second switching is replied, revise local IP route table, and described Cellular Networks link route priority is risen to the highest, and send the 3rd handover request by the described Cellular Networks gateway of described Cellular Networks chain road direction, enter step 28;
Step 28: described Cellular Networks gateway is received described the 3rd handover request, judge and whether be included in the described communications terminal identifiers obtained in step 24 and described communication terminal IP address in described the 3rd handover request, comprise and enter step 29, do not comprise and comprise to described communication terminal transmission the 3rd switching reply of forbidding switching mark, and finish switching flow;
Step 29: described Cellular Networks gateway sends to comprise by the described communication terminal of described Cellular Networks chain road direction and allows the 3rd of switching mark to switch reply;
Step 30: described communication terminal receives and allows the 3rd of switching mark to switch to reply described comprising, and disconnects and being connected of described access point, and delete described WLAN (wireless local area network) link route, wraps by described Cellular Networks link transmission IP.
4. the method for Cellular Networks according to claim 3 and WLAN (wireless local area network) switching, is characterized in that,
Also comprise step 30: described Cellular Networks gateway sends the second switching confirmation to described access point after described the 3rd switching that comprises the permission switching mark of transmission is replied; Described access point receive described second switch to confirm after, the information of the described communication terminal of deletion.
5. the method for according to claim 1 or 3 described Cellular Networks and WLAN (wireless local area network) switching, is characterized in that,
At described Cellular Networks gateway or described access point, terminal sends the IP bag to service server and sets up the address camouflage table clause relevant to described terminal; Otherwise do not set up address camouflage table clause,
When switching, if set up the address camouflage table clause relevant to described terminal as the described Cellular Networks gateway of pre-switch request transmit leg or described access point, the described address relevant with the described terminal duplicate that pretends table clause can send to described access point or described Cellular Networks gateway as pre-switch request receiving side by described pre-switch request; Do not pretend table clause if there is no to set up the address relevant to described terminal as the described Cellular Networks gateway of pre-switch request transmit leg or described access point, do not have the address to pretend table clause and can be sent to described access point or described Cellular Networks gateway as pre-switch request receiving side.
6. the method for according to claim 1 or 3 described Cellular Networks and WLAN (wireless local area network) switching, is characterized in that,
Described Cellular Networks gateway and described access point when sending the pre-switch request, include the duplicate of the former IP address entry identical with IP address of terminal in described pre-switch request;
If comprise address camouflage entry duplicate in the described pre-switch request that described Cellular Networks gateway receives, when described the 3rd switching that comprises the permission switching mark of described Cellular Networks gateway transmission is replied, described address camouflage entry duplicate is added to local address camouflage table;
If comprise address camouflage table clause duplicate in the pre-switch request that described access point receives, when described access point sends the associated response of described expression permission association, described address camouflage entry duplicate is added to local address camouflage table.
7. the method for according to claim 1 or 3 described Cellular Networks and WLAN (wireless local area network) switching, is characterized in that,
Described Cellular Networks gateway is to the IP that receives from described Cellular Networks link bag, take source IP address and source port number as index, camouflage table in this locality carried out up coupling, if it fails to match, newly-built address camouflage table clause, the more described newly-built address camouflage of foundation table clause, the executive address camouflage; If the match is successful, according to the address camouflage table clause that the match is successful, executive address camouflage; The IP bag that obtains after the address camouflage is completed sends to IP kernel heart net;
At first the IP bag of described Cellular Networks gateway to receiving from described IP kernel heart net check whether be the IP-in-IP package,
If the IP bag that receives from described IP kernel heart net is that the IP-in-IP package solves initial IP packet, when terminal corresponding to the purpose IP of initial IP packet just used the Cellular Networks link, initial IP packet is sent to terminal by the Cellular Networks link, when terminal corresponding to the purpose IP of initial IP packet just used the WLAN (wireless local area network) link, initial IP packet is sent to relevant access point with the form of IP-in-IP;
If the IP bag that receives from described IP kernel heart net is not the IP-in-IP package, carry out the descending coupling of address camouflage table with purpose IP and destination slogan, if the match is successful, separate the address camouflage, send to corresponding terminal by described Cellular Networks link again, abandon this IP bag if it fails to match, processing finishes.
8. the method for according to claim 1 or 3 described Cellular Networks and WLAN (wireless local area network) switching, is characterized in that,
The IP bag of described access point to receiving from described WLAN (wireless local area network) link, take source IP address and source port number as the up coupling of index executive address camouflage table, if it fails to match, a newly-built address pretends table clause, after carrying out the address camouflage according to described newly-built entry, send to service server by described IP kernel heart net; If the match is successful, according to after the entry executive address camouflage that the match is successful, send to service server by described IP kernel heart network interface;
The IP bag of described access point to receiving from described IP kernel heart net, if the bag of IP-in-IP form first solves initial IP packet, check that whether the purpose IP of initial IP packet is by being used with own related terminal, if send to terminal by the WLAN (wireless local area network) link, abandon if not; If not the bag of IP-in-IP form take purpose IP and destination slogan as the descending coupling of index executive address camouflage table, if it fails to match, abandons the IP bag; If the match is successful, carry out according to the entry that the match is successful and separate the address camouflage, after separating the address camouflage, check purpose IP, if the terminal that purpose IP is corresponding is related with oneself, send to corresponding terminal by described WLAN (wireless local area network) link, if terminal corresponding to purpose IP with own not related, the form that IP is wrapped with IP-in-IP sends to the Cellular Networks gateway by IP kernel heart net.
9. the system that can realize that Cellular Networks and WLAN (wireless local area network) are switched, comprise the Cellular Networks gateway that is positioned at described Cellular Networks, a plurality of access points that are positioned at described WLAN (wireless local area network), and the IP kernel heart net that connects described Cellular Networks gateway and described multi-access point,
Described Cellular Networks gateway comprises network information management module, Cellular Networks IP packet handing module, Cellular Networks address camouflage module and gateway handoff control module, described gateway handoff control module and described network information management module, Cellular Networks IP packet handing module, Cellular Networks address camouflage module are carried out information interaction, and described network information management module is used for management ip address, end message and access-in point information;
Described access point comprises end message administration module, access point IP packet handing module, access point address camouflage module and access point switching controls module, and described access point switching controls module and described end message administration module, access point IP packet handing module, access point address camouflage module are carried out information interaction
Described communication terminal comprises local information storehouse and switching controls module, the entry contents of described information bank comprises: related Access Point Identifier, the IP address of access point, described switching controls module is used for initiating handover request, receive and process switching control signaling, revise local IP route table, complete switching flow.
10. the system that realizes that Cellular Networks and WLAN (wireless local area network) are switched as claimed in claim 9, is characterized in that,
Described Cellular Networks address camouflage module and described access point address camouflage module are just set up a new address camouflage table clause when new port numbers of the each use of terminal is communicated by letter with service server,
The content of described address camouflage table clause is: former IP, former port numbers, camouflage IP, camouflage port numbers and service time this entry the last time.
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| CN113286273A (en) * | 2020-02-19 | 2021-08-20 | 本田技研工业株式会社 | Communication device and system, radio base station, communication control method, and storage medium |
| CN115529221A (en) * | 2022-08-15 | 2022-12-27 | 广州通则康威智能科技有限公司 | Method and device for fast switching between wired network and cellular network |
| CN115529221B (en) * | 2022-08-15 | 2023-08-15 | 广州通则康威智能科技有限公司 | Method and device for fast switching between wired network and cellular network |
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