CN102651867B - 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
本发明的一种EPS-WLAN融合系统和基于该架构下切换的方法涉及移动通信和无线局域网的技术领域。EPS-WLAN融合系统，包括移动性管理实体MME、数据网关P-GW、无线局域网络WLAN接入网关WAG和各个无线接入点AP；网关WAG通过S1-WM接口和S5-WP接口分别与移动性管理实体MME和数据网关P-GW相连。在以上融合系统中，当双模终端从EPS系统切换到WLAN系统时，该切换基于业务标识，且发生在服务请求时。本发明提出将M2M业务切换到WLAN网络中，从而缓解了EPS系统接入网的负载压力，使系统资源更加合理的利用，保证系统性能。
An EPS-WLAN fusion system and a switching method based on the framework of the present invention relate to the technical fields of mobile communication and wireless local area network. EPS-WLAN converged system, including mobility management entity MME, data gateway P-GW, wireless local area network WLAN access gateway WAG and each wireless access point AP; the gateway WAG communicates with mobile The permanent management entity MME is connected to the data gateway P-GW. In the above converged system, when the dual-mode terminal switches from the EPS system to the WLAN system, the switching is based on the service identifier and occurs when the service is requested. The present invention proposes to switch the M2M service to the WLAN network, thereby alleviating the load pressure of the EPS system access network, making the system resources more rationally utilized, and ensuring the system performance.
Description
Technical field
The present invention relates generally to the technical field of mobile communication and WLAN (wireless local area network).Specifically, based on the changing method of M2M business when relating to the system of LTE and wlan network fusion and occur in service request.
Background technology
M2M is the abbreviation of Machine-to-Machine, referring to that application communication technology realizes the general name of people and people, people and machine, data communication and a series of technology exchanged and combination thereof between machine with machine, is a kind of information exchange towards intelligent terminal and communication type.It encompasses all can to realize, information transmission, the technology of exchange and means are carried out between people, machine, system, Internet of Things namely in broad sense, future will be widely used in all trades and professions and daily life, 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 it needs the support of multiple wired, wireless communication technology, comprising: cordless communication network (GSM/GPRS/UMTS), Ethernet, WLAN, WiFi, sensor network etc.Wherein, mobile radio networks has the advantage such as wide coverage, access convenience, equipment record, is the bearer network of M2M business the best.In view of the market potential that mobile M2M business is huge, each large telecom operation commercial city is using the most important thing of M2M communication as future development in the world.
M2M business carries out the customization of business for special services crowd, and different M2M business characteristically there are differences.According to the work characteristics of existing M2M business, and in conjunction with in 3GPP meeting to the characterizing definition that M2M business is carried out, analyze known M2M business there is Hypomobility, allow data transmission delay, only have packet switch, data traffic volume is little but send the features such as frequent, magnanimity terminal.The following deployment along with M2M business, the data transmit-receive of its magnanimity will take a large amount of WiMAX resource of mobile radio communication, contradiction between the business demand causing limited network carrying ability and large discharge height broadband, WLAN (WLAN), due to features such as its low cost, high transfer rate and extensive deployment abilities flexibly, becomes the only selection alleviating mobile communications network flow.
At present about utilizing the research of WLAN shunt mainly to concentrate in 3G network, also fewer to the research of merging between Long Term Evolution (LTE) and wlan network and work in coordination with, and not yet form specification.For above problem, Chinese patent application CN101841880A (a kind of system of LTE and WLAN interconnection and changing method) proposes a kind of LTE-WLAN fusion architecture, introduce the concept of virtual base station, in LTE side, virtual base station completes the function identical with LTE base station; In WLAN side, virtual base station manager AP access point, realizes the transmitting-receiving of data in handoff procedure and signaling, using the data of WLAN as LTE system and the bottom transmission channel of signaling by Ethernet tunnel protocol between virtual base station and AP.The advantage of this invention to switch and the handoff procedure of LTE is consistent, smaller to systematic influence.But do not consider traffic performance based on the switching under this fusion architecture, may cause the discontinuous of service after switching or degradation, this patent only considered the switching occurred in communication process, does not unload the flow of Access Network from source simultaneously.
Summary of the invention
The technical problem to be solved in the present invention, it is the deficiency overcoming background technology, the emerging system of a kind of EPS (evolved packet system) and WLAN (WLAN) is provided, under this systems based on the changing method of service identification, when this handoff procedure occurs in service 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 is connected with data gateway P-GW with Mobility Management Entity MME with S5-WP interface respectively by S1-WM interface; When user is linked into WLAN WLAN access evolved packet system EPS business, between wireless access point AP and gateway WAG by 802.11 protocol communications, between gateway WAG and Mobility Management Entity MME by 802.3 protocol communications, make Mobility Management Entity MME have disposal ability to Ethernet data; Transmit between gateway WAG and Mobility Management Entity MME be authentication message time, communicated by Radius between gateway WAG and Mobility Management Entity MME, Mobility Management Entity MME extracts relevant data by Diameter to home subscriber server HSS, thus completes the authentication to WLAN WLAN access user.
The present invention newly defines the fusion that WLAN IAD WAG realizes WLAN and EPS, and WAG mainly completes following functions: realize the management to wireless access points (AP), comprises the MAC Address and IP address and SSID that store AP; Realize turning by the envelope again of WLAN access user data and signaling and forwarding, comprise the authentication message of wlan network, service request information etc.; Communicated with MME by Radius agreement, complete MME to the certification of WLAN access user and authentication; Realize the conversion between 802.11 and 802.3 agreements; Broadcast its beacon message with fixed time interval, wherein comprise timestamp, capacity ESSID and business dial gauge.
The emerging system that the present invention proposes needs to increase functional module in MME, makes it have the ability of process Ethernet data, expands the protocol stack of MME simultaneously, make it support Radius agreement.Namely, described Mobility Management Entity MME has the disposal ability to Ethernet data, is increase functional module in Mobility Management Entity MME, and expands the protocol stack of Mobility Management Entity MME, make it support Radius agreement.
The emerging system that the present invention proposes needs to change the data structure in HSS.Namely, described extracts relevant data to home subscriber server HSS, change the data structure in home subscriber server HSS, increase the correlated identities of WAG, AP and UE wherein, comprise the IP address of WAG, IP Address2 that the IP address of AP, wlan network distribute to user and EPS distribute to the IP Address1 of user and the mapping relations between them.Concrete address procedures (see Fig. 3): when UE accesses wlan network, if known users IP address 2, by the database of user in inquiry HSS, the IP address of the WAG finding user region corresponding; Network is connected to relevant WAG, inquires about its database, can find the IP address of the AP of UE IP address 2 correspondence; By inquiry AP database, IP address and the MAC Address of corresponding UE can be found, thus realize the addressing to UE.
In above emerging system, when dual-mode terminal is switched to wlan system from EPS, this switching based on service identification, and when occurring in service request.Concrete switching flow as shown in Figure 5.
Based on the method switched under EPS-WLAN emerging system framework, switch based on M2M service identification, when occurring in service request, flow process is,
The current service network of user terminal is EPS, when it sends service request to eNodeB, can comprise service identification, current business is divided into M2M and H2H two kinds in request message; ENodeB detects the service identification field in service request information, if M2M business, 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, and the network related information according to providing in report carries out handover decisions, and to terminal return service request ACK, wherein comprises the target AP mark of the failed reason of request and switching; User terminal accesses WLAN net by this AP, adopts the certification of EAP-SIM authentication method completing user terminal; Carry out the connection of user terminal and AP, the IP Address of AP and IP Address and TMSI of terminal is transferred to WAG and stores by AP, and by these Parameter Mappings to together; The IP Address of user is transferred in HSS and stores by WAG, and returns user data update success response message to MME;
MME notifies that WAG associative operation completes, and WAG is by AP informing user terminal handover success;
User terminal sends service request by AP to WAG, and WAG is transmitted to MME after carrying out Reseal to association requests.Wherein, the service request information that user terminal sends is that the service request of EPS is encapsulated as IP packet, and sends to WAG by AP, after WAG receives this message, is the S1-MME interface message of EPS, and sends to MME by its Reseal; MME selects corresponding P-GW according to user's service request, subsequently to WAG return service request response, comprises P-GW address in message; This response message Reseal is the IP packet that WLAN net identifies by WAG, send to user terminal by AP, user terminal resolves this message, obtains the address of P-GW, user terminal is by AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
The invention has the beneficial effects as follows, propose M2M business to be switched in wlan network, thus alleviate the load pressure of EPS Access Network, system resource is more reasonably utilized, ensure systematic function.
Accompanying drawing explanation
Fig. 1 is EPS and WLAN emerging system schematic diagram of the present invention.
Fig. 2 is interaction protocol diagram between entity of the present invention.
Fig. 3 is data structure diagram in HSS of the present invention.
Fig. 4 is the mark diagram that switching flow of the present invention transmits.
Fig. 5 is the flow chart that EPS of the present invention switches to wlan system.
Embodiment
Embodiment 1 composition graphs 1 ~ 3 illustrates EPS-WLAN emerging system of the present invention
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 is connected with MME with P-GW respectively by S1-WM with S5-WP interface.When user is linked into wlan network access EPS business, by WLAN agreement i.e. 802.11 communications between AP and WAG, by 802.3 protocol communications between WAG and MME, need expansion MME to the disposal ability of Ethernet data simultaneously; If what transmit between WAG and MME is authentication message, communicated between them by Radius, MME extracts relevant data by Diameter to home subscriber server HSS, thus completes the authentication to WLAN access user.
The emerging system that the present invention proposes needs to increase functional module in MME, make it have the ability of process Ethernet data, expand the protocol stack of MME simultaneously, it is made to support Radius agreement, when user is accessed by WLAN, between WAG and MME, Radius agreement authentication to user and certification can be completed.
The emerging system that the present invention proposes needs to change the data structure in HSS, increase the correlated identities of WAG, AP and UE wherein, mainly comprise the IP address of WAG, IP Address2 that the IP address of AP, wlan network distribute to user and EPS distribute to the IP Address1 of user and the mapping relations between them, data structure as shown in Figure 3.Concrete address procedures: when UE is linked into wlan network, if the IP Address2 of known users, by the database of user in inquiry HSS, the IP address of the WAG finding user region corresponding; Network is connected to corresponding WAG, inquires about its database, finds the AP address corresponding to UE IPAddress2; Finally by the data that inquiry AP stores, find IP address and the MAC Address of corresponding UE, finally realize the addressing to UE.
Embodiment 2 composition graphs 4 and Fig. 5 further illustrate the flow process being switched to wlan system from EPS of the present invention
Based on above emerging system, when dual-mode terminal is switched to wlan system from EPS, this switching based on service identification, and when occurring in service request.As shown in Figure 5, as shown in Figure 4, concrete step is as follows for the conveying flow identified in switching flow for detailed process:
1) service network that user terminal is current is EPS, it sends service request to eNodeB, following field is comprised: TMSI, user terminal IP Address1 are (when user terminal is attached to EPS in request message, P-GW is the IP address of terminal distribution) and service identification, wherein user terminal IP Address1 is user terminal when being attached to EPS, and P-GW is the IP address of terminal distribution;
2) current business is divided into two kinds of different types by the present invention: H2H business and M2M business.
21) H2H business refers to the original speech business and data service etc. in EPS, M2M business refers to Machine To Machine, Human-to-Machine, machine to people, mobile network to the information exchange between machine and communication, as business such as remote sensing, monitoring/warning, payment/transaction;
22) corresponding service identification is also divided into the service identification of two kinds: H2H service identification and M2M;
3) eNodeB detects service identification field in service request information, if M2M business, to the control information of user terminal return measurement, requires that terminal measures current EPS network and wlan network relevant parameter.Survey control mainly comprises measurement to EPS Zhong Zhe community and neighbor cell, to the measurement of AP access point in wlan system, the measurement etc. to EPS and wlan network quality;
4) user terminal detecting step 3) in the relevant parameter that relates to, generate measurement report, and be transferred to eNodeB;
5) eNodeB checks measurement report, and carry out handover decisions according to the network related information provided in report, if now EPS network overload (as exceeding a certain threshold value) and the service quality of wlan network is better, then eNodeB selects a certain AP access point, is switched in wlan network by this M2M business;
6) eNodeB is to user terminal return service request ACK, and the reason that request is failed is described, and the target AP mark SSID switched;
7) user terminal accesses wlan network by the AP selected by eNodeB, and the certification of completing user terminal, certification adopts EAP-SIM authentication method;
71) 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, comprise the TMSI of user terminal in EPS in connection request message, after AP receives this message, be user terminal distributing IP address (IP Address2), and store TMSI and IP Address2;
81) flow process connect please refer to 802.11 series standards;
9) TMSI of the IP Address of AP, terminal IP Address2 and terminal is transferred to WAG by AP, and WAG preserves these information, and by these Parameter Mappings to together;
10) TMSI of the IP Address of WAG, terminal IP Address2 and terminal is transferred to HSS by WAG, the IP Address of WAG and the IP Address2 of terminal is kept in customer data base corresponding to TMSI by HSS, and returns user data update success response message to MME;
11) MME notifies that WAG associative operation completes, and WAG is by AP informing user terminal handover success;
12) user terminal sends service request by AP to WAG, and WAG is transmitted to MME after carrying out Reseal to association requests.Wherein, the service request information that user terminal sends is that the service request of EPS is encapsulated as IP packet, and sends to WAG by AP, after WAG receives this message, is the S1-MME interface message of EPS, and sends to MME by its Reseal;
13) MME selects corresponding P-GW according to user's service request, subsequently to WAG return service request response, comprises P-GW address in message;
14) this response message Reseal is the IP packet that WLAN net identifies by WAG, send to user terminal by AP, user terminal resolves this message, obtains the address of P-GW, user terminal is by AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
Claims (2)
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 is connected with data gateway P-GW with Mobility Management Entity MME with S5-WP interface respectively by S1-WM interface, when user is linked into WLAN WLAN access evolved packet system EPS business, pass through 802.11 protocol communications between wireless access point AP and gateway WAG, between gateway WAG and Mobility Management Entity MME, pass through 802.3 protocol communications, make Mobility Management Entity MME have disposal ability to Ethernet data simultaneously, described Mobility Management Entity MME has the disposal ability to Ethernet data, increase functional module in Mobility Management Entity MME, and expand the protocol stack of Mobility Management Entity MME, make it support Radius agreement, transmit between gateway WAG and Mobility Management Entity MME be authentication message time, communicated by Radius between gateway WAG and Mobility Management Entity MME, Mobility Management Entity MME extracts relevant data by Diameter to home subscriber server HSS, described extracts relevant data to home subscriber server HSS, change the data structure in home subscriber server HSS, increase WAG wherein, the correlated identities of AP and UE, comprise the IP address of WAG, the IP address of AP, wlan network distributes to the IP Address2 of user and EPS distributes to the IP Address1 of user and the mapping relations between them, thus the authentication completed WLAN WLAN access user.
2. based on the method switched under the EPS-WLAN emerging system framework of claim 1, switch based on M2M service identification, when occurring in service request, flow process is,
The current service network of user terminal is EPS, when it sends service request to eNodeB, service identification can be comprised in request message, current business is divided into M2M and H2H two kinds, wherein M2M business refers to Machine To Machine, Human-to-Machine, machine to people, mobile network to the information exchange between machine and communication, and H2H business refers to original speech business in EPS and data service; ENodeB detects the service identification field in service request information, if M2M business, 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, network related information according to providing in report carries out handover decisions, if now EPS network overload and the service quality of wlan network is better, then eNodeB selects a certain AP access point, this M2M business is switched in wlan network, eNodeB, to user terminal return service request ACK, illustrates the reason that request is failed, and the target AP mark SSID switched; User terminal accesses WLAN net by this AP, adopts the certification of EAP-SIM authentication method completing user terminal; Carry out the connection of user terminal and AP, the IP Address of AP and IP Address and TMSI of terminal is transferred to WAG and stores by AP, and by these Parameter Mappings to together; The IP Address of user is transferred in HSS and stores by WAG, and returns user data update success response message to MME;
MME notifies that WAG associative operation completes, and WAG is by AP informing user terminal handover success;
User terminal sends service request by AP to WAG, WAG is transmitted to MME after carrying out Reseal to association requests, wherein, the service request information that user terminal sends is that the service request of EPS is encapsulated as IP packet, and send to WAG by AP, after WAG receives this message, be the S1-MME interface message of EPS by its Reseal, and send to MME; MME selects corresponding P-GW according to user's service request, subsequently to WAG return service request response, comprises P-GW address in message; This response message Reseal is the IP packet that WLAN net identifies by WAG, send to user terminal by AP, user terminal resolves this message, obtains the address of P-GW, user terminal is by AP, WAG, P-GW access external data network afterwards, carries out the transmission of data.
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| CN102984773B (en) * | 2012-11-23 | 2015-09-16 | 富春通信股份有限公司 | WLAN changing method under LTE-WLAN interworking between network and device |
| CN103428736B (en) * | 2013-08-26 | 2015-12-23 | 东莞宇龙通信科技有限公司 | Method for switching network, network switched system and terminal |
| CN104427568B (en) * | 2013-09-05 | 2019-02-19 | 北京华为数字技术有限公司 | A method and device for realizing 3GPP network traffic offloading |
| JP2017527172A (en) * | 2014-07-14 | 2017-09-14 | コンヴィーダ ワイヤレス， エルエルシー | Network-initiated handover in integrated small cell and WiFi networks |
| EP3021617A1 (en) * | 2014-11-14 | 2016-05-18 | Gemalto M2M GmbH | Method for operating a wireless communication device in a cellular network |
| KR102066200B1 (en) | 2015-03-25 | 2020-01-14 | 엘지전자 주식회사 | Method and apparatus for performing offloading procedure for WLAN-LTE integration and interworking in wireless communication system |
| CN107733683B (en) * | 2017-08-26 | 2021-01-26 | 深圳市盛路物联通讯技术有限公司 | Data backup method and device based on Internet of things |
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