CN102651867A - EPS-WLAN fusion system and switching method based on framework - Google Patents
EPS-WLAN fusion system and switching method based on framework Download PDFInfo
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Abstract
The invention discloses an EPS (Electronic Power Steering)-WLAN (Wireless Local Area Network) fusion system and a switching method based on a framework, and relates to the technical field of communication and a WLAN. The EPS-WLAN fusion system comprises a mobility management entity MME, a data gateway P-GW, a WLAN access gateway WAG and each wireless access point AP, wherein the gateway WAG is respectively connected with the mobility management entity MME and the data gateway P-GW through an S1-WM interface and an S5-WP interface. In the fusion system, when a dual-mode terminal is switched into the WLAN from an EPS system, the switching is based on business identification and occurs during service request. According to the fusion system and the switching method, an M2M business is switched into the WLAN, and therefore the load pressure of the EPS system access network is relieved, so that a system resource is more reasonably utilized, and the system performance is ensured.
Description
Technical field
The present invention relates generally to the technical field of mobile communication and WLAN.When specifically, relating to system that LTE and wlan network merge and occurring in services request based on the professional changing method of M2M.
Background technology
M2M is the abbreviation of Machine-to-Machine; Being meant that application communication technology realizes data communication and a series of technology that exchange and the general name of combination thereof between people and people, people and machine, machine and the machine, is a kind of information exchange and communication type towards intelligent terminal.It has been contained, and all can realize; Between people, machine, system, carry out the technology and the means of message transmission, exchange; Just the Internet of Things on the broad sense will be widely used in all trades and professions and the daily life future, and hundreds of millions of non-information technoloy equipments to be ready adding to come in.
Communication network is the core link of M2M technology, and the support that it needs multiple wired, wireless communication technology comprises: cordless communication network (GSM/GPRS/UMTS), Ethernet, WLAN, WiFi, sensor network etc.Wherein, mobile radio networks has wide coverage, inserts advantages such as convenient, that equipment is perfect, is the professional best bearer network of M2M.In view of moving the professional huge market potential of M2M, each big telecom operation commercial city is with the most important thing of M2M communication as future development in the world.
M2M is professional to carry out professional customization to the special services crowd, and different M2M business there are differences on characteristic.According to the professional work characteristics of existing M2M; And combine the characterizing definition that in the 3GPP meeting M2M business carried out, analysis can know that the M2M business has Hypomobility, allows data transmission delay, has only packet switch, characteristics such as the data traffic volume is little but it is frequent to send, magnanimity terminal.Following along with the professional deployment of M2M; The data transmit-receive of its magnanimity will take a large amount of WiMAX resource of mobile radio communication; Cause the contradiction between the business demand in limited network carrying ability and the big high broadband of flow; WLAN (WLAN) is because its low cost, high transfer rate and characteristics such as deployment ability flexibly on a large scale become the only selection of alleviating the mobile communications network flow.
Mainly concentrate in the 3G network about the research that utilizes the WLAN shunting at present, also fewer to the research of merging between Long Term Evolution (LTE) and wlan network and work in coordination with, and do not form standard as yet.To above problem; One Chinese patent application CN101841880A (system and the changing method of a kind of LTE and WLAN interconnection) has proposed a kind of LTE-WLAN fusion architecture; Introduced the notion of virtual base station, in the LTE side, virtual base station is accomplished and LTE base station identical functions; In the WLAN side, virtual base station manager AP access point is realized data and the transmitting-receiving of signaling in the handoff procedure through the Ethernet tunnel protocol between virtual base station and the AP, with WLAN as the data of LTE system and the bottom transmission channel of signaling.The advantage of this invention is that the handoff procedure of switching and LTE is consistent, and is smaller to systematic influence.But traffic performance is not considered in the switching that is based under this fusion architecture, possibly cause the discontinuous or degradation of service after switching, and this patent has only considered to occur in the switching in the communication process simultaneously, not the flow of unloading Access Network from the source.
Summary of the invention
The technical problem that the present invention will solve; Be to overcome disadvantages of background technology; The emerging system of a kind of EPS (evolved packet system) and WLAN (WLAN) is provided and under this system based on the changing method of service identification, when this handoff procedure occurs in services request.
A kind of EPS-WLAN emerging system comprises Mobility Management Entity MME, data gateway P-GW, WLAN WLAN IAD WAG and each wireless access point AP; Gateway WAG links to each other with data gateway P-GW with Mobility Management Entity MME respectively with the S5-WP interface through the S1-WM interface; When the user is linked into WLAN WLAN visit evolved packet system EPS business; Through passing through 802.3 protocol communications between 802.11 protocol communications, gateway WAG and the Mobility Management Entity MME, make Mobility Management Entity MME have disposal ability between wireless access point AP and the gateway WAG to Ethernet data; When transmit between gateway WAG and the Mobility Management Entity MME be authentication message the time; Communicate by letter through Radius between gateway WAG and the Mobility Management Entity MME; Mobility Management Entity MME extracts relevant data through Diameter to home subscriber server HSS, thereby accomplishes the authentication that WLAN WLAN is inserted the user.
Redetermination of the present invention WLAN IAD WAG realize the fusion of WLAN and EPS system, WAG mainly accomplishes following function: realization comprises the MAC Address and IP address and the SSID that store AP to the management of wireless access points (AP); Realize changeing and forwarding, comprise the authentication message, service request information of wlan network etc. through the envelope again of WLAN access user data and signaling; Communicate by letter with MME through the Radius agreement, accomplish MME inserts the user to WLAN authentication and authentication; Realize the conversion between 802.11 and 802.3 agreements; Broadcast its beacon message at interval with regular time, wherein comprise timestamp, capacity ESSID and professional dial gauge.
The emerging system that the present invention proposes need increase functional module in MME, make it have the ability of handling Ethernet data, expands the protocol stack of MME simultaneously, makes it support the Radius agreement.Just, described Mobility Management Entity MME has the disposal ability to Ethernet data, is in Mobility Management Entity MME, to increase functional module, and the protocol stack of expansion Mobility Management Entity MME, makes it support the Radius agreement.
The emerging system that the present invention proposes need change the data structure among the HSS.Promptly; The described data of being correlated with of extracting to home subscriber server HSS; It is the data structure that changes among the home subscriber server HSS; Increase the correlated identities of WAG, AP and UE therein, comprise the IP address of IP address, the AP of WAG, IP Address2 and the EPS system assignment that wlan network is distributed to the user given user's IP Address1 and the mapping relations between them.Concrete addressing process (referring to Fig. 3): when UE inserts wlan network, if the IP address of the corresponding WAG in user region can be found through user's data storehouse among the inquiry HSS in known users IP address 2; Network is connected to relevant WAG, inquires about its database, can find the IP address of the AP of UE IP address 2 correspondences; Through inquiry AP database, can find IP address and the MAC Address of corresponding UE, thereby realize addressing UE.
In above emerging system, when dual-mode terminal when the EPS system switches to wlan system, this switches based on service identification, and when occurring in services request.Concrete switching flow is as shown in Figure 5.
A kind of method of switching down based on EPS-WLAN emerging system framework is switched based on the M2M service identification, and when occurring in services request, flow process is,
The current service network of user terminal is the EPS system, when its when eNodeB sends services request, can comprise service identification in the request message, current business is divided into two kinds of M2M and H2H; ENodeB detects the service identification field in the service request information, if M2M is professional, to the control information of user terminal return measurement; User terminal generates measurement report according to measuring control information, returns to eNodeB;
ENodeB checks measurement report, carries out handover decisions according to the network related information that provides in the report, and returns services request ACK to the terminal, wherein comprises the reason of request failure and the target AP sign of switching; User terminal inserts the WLAN net through this AP, adopts the EAP-SIM authentication method to accomplish the authentication of user terminal; Carry out the connection of user terminal and AP, AP is transferred to the WAG storage with the IP Address of AP and the IP Address and the TMSI at terminal, and these parameter maps are arrived together; WAG is transferred to user's IP Address among the HSS and stores, and returns user data update success response message to MME;
MME notice WAG associative operation is accomplished, and WAG is through AP informing user terminal handover success;
User terminal sends services request through AP to WAG, and WAG is transmitted to MME after association requests is encapsulated again.Wherein, the service request information that user terminal sends is that the services request with the EPS system is encapsulated as the IP packet, and sends to WAG through AP, after WAG receives this message, it is encapsulated as the S1-MME interface message of EPS system again, and sends to MME; MME selects corresponding P-GW according to user's services request, returns service request response message to WAG subsequently, comprises the P-GW address in the message; WAG is encapsulated as this response message the IP packet of WLAN net identification again; Send to user terminal through AP, user terminal is resolved this message, obtains the address of P-GW; User terminal can pass through AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
The invention has the beneficial effects as follows that proposition switches to the M2M business in the wlan network, thereby alleviated the load pressure of EPS system Access Network, make system resource reasonable use more, guarantee systematic function.
Description of drawings
Fig. 1 is EPS of the present invention and WLAN emerging system sketch map.
Fig. 2 is an interaction protocol diagram between the entity of the present invention.
Fig. 3 is a data structure diagram among the HSS of the present invention.
Fig. 4 is the sign diagram that switching flow of the present invention transmits.
Fig. 5 is the flow chart that EPS of the present invention system is switched to wlan system.
Embodiment
The invention provides the emerging system of a kind of evolved packet system EPS and WLAN, as shown in Figure 1.This system comprises Mobility Management Entity MME, data gateway P-GW, WLAN IAD WAG and each wireless access point AP.As shown in Figure 2, WAG links to each other with P-GW with MME respectively with the S5-WP interface through S1-WM.When the user is linked into wlan network visit EPS system business, through i.e. 802.11 communications of WLAN agreement, through 802.3 protocol communications, need expand the disposal ability of MME simultaneously between WAG and the MME between AP and the WAG to Ethernet data; If what transmit between WAG and the MME is authentication message, through Radius communication, MME extracts relevant data through Diameter to home subscriber server HSS between them, thereby accomplishes the authentication that WLAN is inserted the user.
The emerging system that the present invention proposes need increase functional module in MME; Make it have the ability of handling Ethernet data; Expand the protocol stack of MME simultaneously; Make it support the Radius agreement, when the user inserts through WLAN, can the Radius agreement accomplish authentication and authentication between WAG and the MME the user.
The emerging system that the present invention proposes need change the data structure among the HSS; Increase the correlated identities of WAG, AP and UE therein; Mainly comprise the IP address of IP address, the AP of WAG, IP Address2 and the EPS system assignment that wlan network is distributed to the user given user's IP Address1 and the mapping relations between them, data structure is as shown in Figure 3.Concrete addressing process: when UE is linked into wlan network, if the IP Address2 of known users can find the IP address of the corresponding WAG in user region through user's data storehouse among the inquiry HSS; Network is connected to corresponding WAG, inquires about its database, finds the pairing AP of UE IPAddress2 address; Through the data of inquiry AP storage, find IP address and the MAC Address of corresponding UE at last, the final addressing that realizes UE.
Embodiment 2 combines Fig. 4 and Fig. 5 to further specify the flow process that switches to wlan system from the EPS system of the present invention
Based on above emerging system, when dual-mode terminal when the EPS system switches to wlan system, this switches based on service identification, and when occurring in services request.Detailed process as shown in Figure 5, the conveying flow that identifies in the switching flow is as shown in Figure 4, and concrete step is following:
1) the current service network of user terminal is EPS; It sends services request to eNodeB; Comprise following field: TMSI, user terminal IP Address1 in the request message (when user terminal is attached to the EPS system; P-GW is the IP address of terminal distribution) and service identification, wherein user terminal IP Address1 is a user terminal when being attached to the EPS system, P-GW is the IP address of terminal distribution;
2) the present invention is divided into the professional and M2M business of two kinds of different types: H2H with current business.
21) the H2H business refers to original speech business and data service in the EPS system etc.; The M2M business refer to machine, Human-to-Machine, machine to people, mobile network to the information exchange between the machine with communicate by letter, like business such as remote sensing, monitoring/warning, payment/transaction;
22) the corresponding business sign also is divided into two kinds: the service identification of H2H service identification and M2M;
3) eNodeB detects service identification field in the service request information, if M2M is professional, to the control information of user terminal return measurement, requires the terminal to measure current EPS network and wlan network relevant parameter.Measure control mainly comprise measurement to this sub-district and neighbor cell in the EPS system, to the measurement of AP access point in the wlan system, to the measurement of EPS and wlan network quality etc.;
4) user terminal detects the relevant parameter that relates in the step 3), generates measurement report, and is transferred to eNodeB;
5) eNodeB checks measurement report; And carry out handover decisions according to the network related information that provides in the report; The service quality of wlan network is better if the load of EPS network is overweight at this moment (as surpassing a certain threshold value); Then eNodeB selects a certain AP access point, and this M2M business is switched in the wlan network;
6) eNodeB returns services request ACK to user terminal, the target AP sign SSID that the reason of request failure is described and is switched;
7) user terminal inserts wlan network through the selected AP of eNodeB, and accomplishes the authentication of user terminal, and the EAP-SIM authentication method is adopted in authentication;
71) the EAP-SIM identifying procedure please refer to following international standard:
a)3GPP?TS?33.234v6.9.0，″WLAN?Interworking?Security″.
b)3GPP?TS?23.234v6.10.0，″WLAN?Interworking；System?Description″.
c)IETF?RFC?4186，″EAP-SIM″
d)IETF?RFC?3748，″Extensible?Authentication?Protocol(EAP)″.
8) carry out the connection of user terminal and AP, connect in the request message and comprise the TMSI of user terminal in the EPS system, after AP receives this message, be user terminal distributing IP address (IP Address2), and storage TMSI and IP Address2;
81) flow process that connects please refer to 802.11 series standards;
9) AP is transferred to WAG with the TMSI at IP Address, terminal IP Address2 and the terminal of AP, and WAG preserves these information, and these parameter maps are arrived together;
10) WAG is transferred to HSS with the TMSI at IP Address, terminal IP Address2 and the terminal of WAG; HSS is kept at the IP Address of WAG and the IP Address2 at terminal in the TMSI corresponding user data storehouse, and returns user data update success response message to MME;
11) MME notice WAG associative operation is accomplished, and WAG is through AP informing user terminal handover success;
12) user terminal sends services request through AP to WAG, and WAG is transmitted to MME after association requests is encapsulated again.Wherein, the service request information that user terminal sends is that the services request with the EPS system is encapsulated as the IP packet, and sends to WAG through AP, after WAG receives this message, it is encapsulated as the S1-MME interface message of EPS system again, and sends to MME;
13) MME selects corresponding P-GW according to user's services request, returns service request response message to WAG subsequently, comprises the P-GW address in the message;
14) WAG is encapsulated as this response message the IP packet of WLAN net identification again; Send to user terminal through AP, user terminal is resolved this message, obtains the address of P-GW; User terminal can pass through AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
Claims (4)
1. an EPS-WLAN emerging system comprises Mobility Management Entity MME, data gateway P-GW, WLAN WLAN IAD WAG and each wireless access point AP; Gateway WAG links to each other with data gateway P-GW with Mobility Management Entity MME respectively with the S5-WP interface through the S1-WM interface; When the user is linked into WLAN WLAN visit evolved packet system EPS business; Through passing through 802.3 protocol communications between 802.11 protocol communications, gateway WAG and the Mobility Management Entity MME, make Mobility Management Entity MME have disposal ability simultaneously between wireless access point AP and the gateway WAG to Ethernet data; When transmit between gateway WAG and the Mobility Management Entity MME be authentication message the time; Communicate by letter through Radius between gateway WAG and the Mobility Management Entity MME; Mobility Management Entity MME extracts relevant data through Diameter to home subscriber server HSS, thereby accomplishes the authentication that WLAN WLAN is inserted the user.
2. EPS-WLAN emerging system according to claim 1; It is characterized in that; Described Mobility Management Entity MME has the disposal ability to Ethernet data; Be in Mobility Management Entity MME, to increase functional module, and the protocol stack of expansion Mobility Management Entity MME, make it support the Radius agreement.
3. EPS-WLAN emerging system according to claim 1 and 2; It is characterized in that; The described data of being correlated with of extracting to home subscriber server HSS; Be the data structure that changes among the home subscriber server HSS, increase the correlated identities of WAG, AP and UE therein, comprise the IP address of WAG, the IP address of AP, IP Address2 and the EPS system assignment that wlan network is distributed to the user and give user's IP Address1 and the mapping relations between them.
4. a method of switching down based on the EPS-WLAN emerging system framework of claim 1 is switched based on the M2M service identification, and when occurring in services request, flow process is,
The current service network of user terminal is the EPS system, when its when eNodeB sends services request, can comprise service identification in the request message, current business is divided into two kinds of M2M and H2H; ENodeB detects the service identification field in the service request information, if M2M is professional, to the control information of user terminal return measurement; User terminal generates measurement report according to measuring control information, returns to eNodeB;
ENodeB checks measurement report, carries out handover decisions according to the network related information that provides in the report, and returns services request ACK to the terminal, wherein comprises the reason of request failure and the target AP sign of switching; User terminal inserts the WLAN net through this AP, adopts the EAP-SIM authentication method to accomplish the authentication of user terminal; Carry out the connection of user terminal and AP, AP is transferred to the WAG storage with the IPAddress of AP and the IPAddress and the TMSI at terminal, and these parameter maps are arrived together; WAG is transferred to user's IP Address among the HSS and stores, and returns user data update success response message to MME;
MME notice WAG associative operation is accomplished, and WAG is through AP informing user terminal handover success;
User terminal sends services request through AP to WAG, and WAG is transmitted to MME after association requests is encapsulated again.Wherein, the service request information that user terminal sends is that the services request with the EPS system is encapsulated as the IP packet, and sends to WAG through AP, after WAG receives this message, it is encapsulated as the S1-MME interface message of EPS system again, and sends to MME; MME selects corresponding P-GW according to user's services request, returns service request response message to WAG subsequently, comprises the P-GW address in the message; WAG is encapsulated as this response message the IP packet of WLAN net identification again; Send to user terminal through AP, user terminal is resolved this message, obtains the address of P-GW; User terminal can pass through AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
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