CN113365300A - Simulation system of mobile network and service test method of mobile network - Google Patents
Simulation system of mobile network and service test method of mobile network Download PDFInfo
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Abstract
The embodiment of the invention discloses a simulation system of a mobile network and a service test method of the mobile network. The simulation system includes: communication terminal simulation, communication base station simulation and core network simulation; the core network simulation comprises EPC simulation and IMS simulation; wherein: the communication terminal simulates the simulation of accessing a core network through a communication base station; the communication base station simulation is respectively in communication connection with the EPC simulation and the IMS simulation; the simulation method comprises the steps of communication terminal simulation, communication base station simulation, EPC simulation and IMS simulation, wherein the simulation system of the mobile network is generated by piecing and building mobile network open-source framework platforms which respectively support the communication terminal simulation, the communication base station simulation, the EPC simulation and the IMS simulation. The simulation system can carry out 1:1 reduction on the existing network, can simulate the IMS on the basis of EPC simulation, realizes comprehensive simulation on the whole network, and breaks through the bottleneck that experiments can only be developed on the mobile terminal side.
Description
Technical Field
The embodiment of the invention relates to the technical field of mobile communication, in particular to an analog simulation system of a mobile network and a service test method of the mobile network.
Background
The information development has entered the era of mobile internet, and the network architecture of mobile internet is greatly different from that of traditional internet. Compared with the traditional Internet, the mobile Internet research environment is obviously more complex to set up and has higher cost. Due to the complexity, the security and other reasons, the civilian mobile communication network cannot be directly used for learning and researching the security related technologies of the mobile internet.
In order to meet the requirements of experiments of key technologies of the mobile internet and analysis and research work of software systems of the experiments, a simulation and simulation environment of the mobile internet is urgently needed to be built so as to meet the requirements of scientific research and experiments and provide a research platform support for related researchers.
Most of the existing fourth generation mobile communication technology (4G) mobile network simulation technologies perform analog simulation on part of network elements and functions of a 4G Long Term Evolution (LTE) network, and do not form comprehensive analog simulation capability for the whole network. In addition, the mobile network platform is limited, and most of the current experimental research on the mobile network is performed on the mobile terminal, which has a technical bottleneck.
Disclosure of Invention
The embodiment of the invention provides a simulation system of a mobile network and a service test method of the mobile network, which can carry out 1:1 reduction on the existing network, can simulate an IMS on the basis of EPC simulation, realize comprehensive simulation on the whole network and break through the bottleneck that experiments can only be developed on the mobile terminal side.
In a first aspect, an embodiment of the present invention provides a simulation system for a mobile network, where the simulation system includes: communication terminal simulation, communication base station simulation and core network simulation; the core network simulation comprises an evolved packet core network EPC simulation and a multimedia subsystem IMS simulation; wherein:
the communication terminal simulates the simulation of accessing a core network through a communication base station; the communication base station simulation is respectively in communication connection with EPC simulation and IMS simulation in the core network simulation;
and the communication terminal simulation, the communication base station simulation, the EPC simulation and the IMS simulation are pieced together and built through a mobile network open-source framework platform which respectively supports the communication terminal simulation, the communication base station simulation, the EPC simulation and the IMS simulation, so that an analog simulation system of the mobile network is generated.
In a second aspect, an embodiment of the present invention further provides a method for testing a service of a mobile network, where the method is applied to a simulation system of the mobile network provided in any embodiment of the present invention, and the method includes:
carrying out voice call test through the simulation system; or, carrying out a video call test through the simulation system; or, carrying out a voice-to-video test through the simulation system; or, the roaming test is carried out through the simulation system; or, the cross-network service intercommunication test is carried out through the simulation system.
The invention configures a simulation system of a mobile network, specifically, the simulation system comprises: communication terminal simulation, communication base station simulation and core network simulation; the core network simulation comprises EPC simulation and IMS simulation; wherein: the communication terminal simulates the simulation of accessing a core network through a communication base station; the communication base station simulation is respectively in communication connection with the EPC simulation and the IMS simulation; the simulation system of the mobile network is generated by piecing and constructing a mobile network open-source framework platform which respectively supports communication terminal simulation, communication base station simulation, EPC simulation and IMS simulation, so that the problem of constructing the simulation system of the mobile network is solved, 1:1 reduction of the existing network is realized, IMS simulation can be realized on the basis of EPC simulation, comprehensive simulation of the whole network is realized, and the bottleneck effect that experiments can only be developed on the side of the mobile terminal is broken through.
Drawings
Fig. 1 is a schematic structural diagram of an emulation system of a mobile network according to an embodiment of the present invention;
fig. 2 is a flow chart of a mobile network simulation according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an emulation system of another mobile network according to an embodiment of the present invention;
fig. 4 is a flowchart of a voice call testing method according to an embodiment of the present invention;
fig. 5 is a flowchart of a roaming test method according to an embodiment of the present invention;
fig. 6 is a flowchart of a cross-network service interworking testing method provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of an emulation simulation system of a mobile network according to an embodiment of the present invention, which is applicable to a case of building an emulation simulation environment of a mobile internet to perform mobile internet research. As shown in fig. 1, the simulation system specifically includes: a communication terminal simulation 110, a communication base station simulation 120, and a core network simulation 130; the Core network simulation 130 includes an Evolved Packet Core (EPC) simulation 131 and a Multimedia Subsystem (IMS) simulation 132. Wherein:
the communication terminal simulation 110 accesses the core network simulation 130 through the communication base station simulation 120; therein, the communication base station emulator 120 is communicatively connected to the EPC emulator 131 and the IMS emulator 132 in the core network emulator 130, respectively.
The communication terminal simulation 110, the communication base station simulation 120, the EPC simulation 131, and the IMS simulation 132 are constructed by piecing together mobile network open-source framework platforms that respectively support the communication terminal simulation, the communication base station simulation, the EPC simulation, and the IMS simulation, thereby generating an analog simulation system of a mobile network.
In the prior art, the method is generally realized by an open source software framework OpenAirInterfaceTM (OAI). The OAI wireless technology platform is a flexible platform facing an open LTE ecosystem, provides an LTE system implementation based on open source software, and can be used for constructing and customizing an LTE base station (OAI eNB), user equipment (OAI UE) and a core network (OAI EPC) on a PC (computer). However, although the OAI platform software package is complete, the OAI platform software package cannot simulate the core network element of the IMS network, and meanwhile, the OAI platform software package is troublesome to install and the actual test is stable. That is, an analog system for simulating the entire mobile network cannot be configured, and the mobile network cannot be effectively studied.
Fig. 2 is a flow chart of a mobile network simulation according to an embodiment of the present invention. As shown in fig. 2, in an optional implementation manner of the embodiment of the present invention, the communication terminal simulation and the communication base station simulation are simulated by an srsLTE platform; simulation of EPC is carried out through a nextEPC platform; the IMS simulation is performed by the OpenIMS platform. The simulation system of the mobile network provided by the embodiment of the invention has the characteristics of simple installation configuration, high system stability and the like. The communication terminal may be a commercial terminal, among others.
The srsLTE platform is a free-source LTE Software Radio (SDR) platform, is released under the license of AGPLv3 license, and uses related functions of OpenLTE in implementation. The srsLTE has the functions of eNB, UE and EPC of a full protocol stack, and meanwhile, the srsEPC has the characteristics of concise code, simple configuration, convenience in use and the like.
nextpcs are open-source LTE core networks written in C, and on top of the latest version of ubuntu system, a package of nextpcs is provided that supports the following functions: LTE Release14 is supported, the USIM card using Milenage is supported, multiple Public Data Networks (PDN) support, S1/X2 handover support, IPV6 support, Circuit Switched Fallback (CSFB) support, and SMS Over SGs (SMSoS) support, various Encryption algorithms such as Advanced Encryption Standard (AES), Encryption algorithm Snow3G, and Encryption algorithm ZUC, Voice Over Long-Term Evolution-supported Voice Over bearer (Voice-Term Evolution, VoLTE) support.
The openIMS is used for realizing an IMS network, is also a piece of opening source software, and is very convenient to build under Ubuntu. The IMS architecture, as a development direction of a multimedia service core network, plays an important role in more and more communication systems.
On the basis of the above embodiments, the mobile network simulation may also adopt other simulation technologies, component configuration, interface adaptation, customized development, and the like to construct a mobile network, such as a fourth generation mobile communication technology (4G) network environment.
Fig. 3 is a schematic structural diagram of an emulation system of another mobile network according to an embodiment of the present invention. As shown in fig. 3, in an optional implementation manner of the embodiment of the present invention, EPC simulation includes the following core network elements: mobility Management node Function (MME), Home Subscriber Server (HSS), Serving Gateway (SGW), PDN Gateway (PGW), and Policy and Charging rules Function (Policy and Charging Rule Function, PCRF); IMS emulation, comprising the following core network elements: a Proxy-call session control entity (Proxy-CACF, P-CSCF), an Interrogating call session control entity (I-CSCF), a Serving call session control entity (Serving CSCF, S-CSCF) and an HSS. The core network elements may be connected through the same or different interfaces, and the specific connection condition and the adopted interface condition may be as shown in fig. 3.
As shown in fig. 3, a terminal (VoLET UE) can access a 4G core network through a Uu interface access end base station (eNodeB, eNB). The system builds a wireless network by deploying a 4G small base station (eNB), simulates core network elements such as an EPC (evolved packet core) and an IMS (IP multimedia subsystem), and builds an LTE (long term evolution) network simulation environment.
As shown in fig. 3, the EPC core network elements include: MME, HSS, SGW, PGW, PCRF. The MME is responsible for signaling processing and realizes control functions of user mobility management, session management, access authentication and the like. The HSS stores the user subscription information and realizes the functions of user data management, authentication and the like. The SGW is responsible for data processing, and implements functions such as session management, data routing and forwarding, and idle-mode downlink data caching. The PGW is a gateway accessing the PDN, and allocates an IP address to a user, thereby implementing functions such as session management, data routing, and forwarding. The PCRF is a policy control unit and implements functions such as policy control of service quality.
As shown in fig. 3, the IMS core network element includes: P-CSCF, I-CSCF, S-CSCF, HSS. The P-CSCF is the first node to connect to the IMS terminal and provides a proxy function. The I-CSCF is positioned in the network and provides functions of user service node distribution, routing query, topology hiding between IMS domains and the like. The S-CSCF is a control core network element of the IMS, and an execution node of IMS session management completes control and connection. The HSS is a central database that stores subscriber information, containing all subscriber related data.
In the technical solution of this embodiment, a simulation system of a mobile network is configured, specifically, the simulation system includes: communication terminal simulation, communication base station simulation and core network simulation; the core network simulation comprises EPC simulation and IMS simulation; wherein: the communication terminal simulates the simulation of accessing a core network through a communication base station; the communication base station simulation is respectively in communication connection with the EPC simulation and the IMS simulation; the simulation system of the mobile network is generated by piecing and constructing a mobile network open-source framework platform which respectively supports communication terminal simulation, communication base station simulation, EPC simulation and IMS simulation, so that the problem of constructing the simulation system of the mobile network is solved, 1:1 reduction of the existing network is realized, IMS simulation can be realized on the basis of EPC simulation, comprehensive simulation of the whole network is realized, and the bottleneck effect that experiments can only be developed on the side of the mobile terminal is broken through.
The simulation system of the mobile network provided by the embodiment of the invention follows the 3rd Generation Partnership Project (3 GPP) standard and simulates core network elements such as an EPC (MME, SGW, PGW, HSS) and an IMS (P-CSCF, I-CSCF, S-CSCF, HSS) and the like; the LTE core network is constructed, and signaling flows such as attachment, bearing, switching and the like are supported; multiple authentication modes can be provided, and multiple terminals such as a mobile phone, a notebook or a 4G terminal and the like can be simultaneously accessed; the method can provide communication related services such as web browsing, video watching, high-definition voice and video call services for the user.
The simulation system of the mobile network provided by the embodiment of the invention can be used for specifically testing the service testing method of the mobile network. Specifically, a voice call test can be performed through the simulation system; or, carrying out a video call test through the simulation system; or, carrying out a voice-to-video test through a simulation system; or, roaming test is carried out through a simulation system; or, the cross-network service intercommunication test is carried out through the simulation system.
Fig. 4 is a flowchart of a voice call testing method according to an embodiment of the present invention. As shown in fig. 4, the voice call test is performed by the analog system, which includes: a first calling terminal of the voice call test initiates a session request through EPC simulation; a first calling terminal initiates a policy control and charging PCC flow through IMS simulation, executes voice special bearing establishment and resource reservation, and forwards a session request to a first called terminal of a voice call test; the first called terminal receives the session request and responds to the session request; according to the response, the first called terminal initiates a PCC flow through IMS simulation, and executes voice special bearing establishment and resource reservation; the first calling terminal and the first called terminal carry out media negotiation and resource reservation, and when the resource reservation is successful, the first called terminal listens to the voice conversation.
The 4G LTE user high-definition voice simulation service is realized based on VoLTE. VoLTE is an end-to-end voice solution under the all-IP condition, relates to each technical domain of terminal, wireless, Packet Switch (PS), IMS, etc., and aims to replace circuit domain voice. The LTE system provides radio access, the EPS system provides a bearer, the IMS system provides service Control, and a Policy Control and Charging (PCC) architecture implements quality of service (QoS) Control for a user and Control of a Charging Policy.
The embodiment of the invention realizes VoIP voice and video services, and consists of a terminal (a private network 4G card), an access network (a standard public network base station eNB), an EPC domain (integrated EPC), an IMS domain (I/P/S-CSCF, HSS and the like). The embodiment of the invention can superpose and deploy the IMS network on the EPC network, and the LTE network carries the voice call service of the user, thereby realizing the VoLTE service function.
In the embodiment of the invention, after the VoLTE user is successfully registered, high-definition voice service can be started, the special bearer establishment is triggered through the PCC process, the voice special bearer with the QoS Class Identifier (QCI) of 1 is established, and the voice is clearer by adopting a novel variable-rate multi-mode broadband voice coder-decoder (AMR-WB) coder-decoder. The VoLTE voice supports a preprocessing (Precondition) flow, two times of media negotiation are carried out before the conversation, the resource reservation is carried out, the ringing can be connected only after the resource reservation is successful, and the call failure caused by the failure of the establishment of the special bearer is avoided.
Specifically, as shown in fig. 4, the first calling end sends an INVITE (INVITE) message to initiate a session request, where the INVITE message includes media information; the first calling terminal P-CSCF initiates a PCC process, executes the establishment of a proprietary bearer and the reservation of resources, and forwards the call to the first called terminal. The first called end can make a response, for example, the response is 100, which represents that the message is received; another example of an answer response is 183, representing call processing. Where media information may be included in 183 to perform the media negotiation function. The first called end P-CSCF initiates a PCC flow and executes the establishment of the proprietary bearing and the reservation of resources. The first calling terminal and the first called terminal carry out media negotiation and resource reservation, when the resource reservation is successful, the first called terminal can ring, and the first called terminal enters voice conversation after listening to the voice conversation. And when the voice call is released, releasing the special bearer.
In a specific test, two smart phones can be prepared, a private network 4G SIM card is inserted, and VoLTE high-definition voice is started; and starting up the mobile phone near the LTE base station, displaying High Definition (HD) on the mobile phone terminal, and then successfully registering the VoLTE. The two mobile phones can make and receive calls, perform voice test, and determine whether the voice quality is clear, whether noise exists, and the like. Through the test results, the simulation system can be improved. When the simulation system provided by the embodiment of the invention is used for voice test, the data in each link of the voice test can be intercepted and acquired, so that the accurate analysis of each part is realized. For example, each core network element may be intercepted by a packet to determine whether there is a problem with its data processing.
In an optional implementation of the embodiment of the present invention, the video call test may be performed by an analog system. Carry out video call test through analog system, include: a second calling terminal of the video call test initiates a call request through EPC simulation; the second calling terminal initiates a policy control and charging PCC flow through IMS simulation, executes video call special bearing establishment and resource reservation, and forwards a call request to a second called terminal of the video call test; the second called side receives the call request and responds to the call request; according to the response, the second called terminal initiates a PCC flow through IMS simulation, and executes the establishment of the video call special bearing and the resource reservation; and the second calling terminal and the second called terminal carry out media negotiation and resource reservation, and when the resource reservation is successful, the second called terminal listens to the voice conversation.
The terminal realizes the video service by using the VoLTE network provided by the simulation environment and can directly dial a video call. The video call testing process is similar to the high-definition voice call testing process, but the media carrying protocols used in the specific media negotiation process are different. The media bearer protocol in the video call test may be QCI-2.
In the embodiment of the invention, after VoLTE voice calling, the voice call can be switched into video call, and whether the image is clear and smooth is tested, namely, the voice-to-video test is carried out. In an optional implementation manner of the embodiment of the present invention, performing a voice-to-video test through an analog system includes: a third calling terminal of the voice-to-video test initiates a voice-to-video session request through EPC simulation; a third calling terminal initiates a PCC process through IMS simulation, and initiates an Authentication Authorization Request (AAR), a Re-Authorization Request (Re-Auth-Request, AAR) and an Evolved Radio Access Bearer (E-RAB) establishment Request, executes voice-to-video Bearer establishment, and forwards a voice-to-video session Request to a third called terminal of a voice-to-video test; the third called end receives the conversation request from voice to video, and carries out Re-authorization response (Re-Auth-Answer, RAA) aiming at the conversation request from voice to video; according to RAA, a third called terminal initiates a PCC flow through IMS simulation, performs Radio Resource Control (RRC) connection, and executes voice-to-video special bearer establishment; and the third calling terminal and the third called terminal carry out data transmission through the special load bearing of voice-to-video.
In the simulation system provided by the embodiment of the invention, the VoLTE supports the switching to the video call after the voice call is entered, initiates Invite information containing voice and video media information, initiates a special bearer establishment flow at a network side, and establishes a special video bearer with QCI of 2.
Specifically, when initiating a video request, the terminal sends a Re-Invite (Re-Invite) message to the network, and initiates a Session Initiation Protocol (SIP) Session flow. And after response, the P-CSCF on the calling side and the called side initiates a PCC process to the PCRF, the process which is the same as the process for establishing the special bearer with QCI (quaternary intermediate frequency resource indicator) 1 is adopted, and the special bearer with QCI 2 is established for the video service through a series of signaling messages such as AAR (architecture), RAR (radio rate management), bearer establishment request, E-RAB (enhanced radio access bearer) establishment request, RRC (radio resource control) connection reconfiguration and the like. Voice and video are transmitted between end users over different proprietary bearers.
On the basis of the above embodiment, the terminal can surf the internet, browse a webpage or watch a video through the simulation system provided by the embodiment of the invention. The simulation system builds an end-to-end 4G base station and core network equipment, the 4G base station adopts a standard small base station at present, and the core network EPC mainly comprises network elements such as an MME, an SGW, a PGW, an HSS and a PCRF. The terminal uses the burnt white card and the access point configured by the equipment to start up in the coverage range of the base station, displays 4G signals, and can surf the internet by using a 4G network to browse webpages, videos and the like. The simulation system provided by the embodiment of the invention can be used for carrying out corresponding tests such as surfing the Internet, browsing webpages, videos and the like.
Fig. 5 is a flowchart of a roaming test method according to an embodiment of the present invention. As shown in fig. 5, the home location and the visited location in the roaming test both adopt the simulation system of the mobile network provided by the embodiment of the present invention to perform simulation of the mobile network; routing Agent nodes (DRA) are arranged in the network of the home location and the network of the visit location; the home DRA and the visited DRA are interworked via an internet Packet Exchange protocol (IPX).
In an optional implementation manner of the embodiment of the present invention, the performing the roaming test by the simulation system includes: according to the roaming information, configuring a roaming user to adopt an attribution access networking or a visiting access networking; when a roaming user roams from a home network to a visited network, generating a destination domain according to roaming user identification information, sending the destination domain to a home DRA, acquiring a roaming signaling determined by the home DRA according to the destination domain, and simulating authentication and registration of the roaming user in an EPC (electronic product code); and networking access is carried out through EPC simulation according to home access networking or visited access networking adopted by the roaming user.
According to home access networking or visited access networking adopted by a roaming user, networking access is performed through EPC simulation, and the method comprises the following steps: when a roaming user adopts home location access networking, user data and a home location address are carried through EPC simulation of the home location; user data and an address of a home location are obtained through EPC simulation of a visited place, and a bearing resource is applied to a home domain to realize home location access of a roaming user; alternatively, the first and second electrodes may be,
when a roaming user adopts a visited place to access the networking, the load bearing is accessed to the visited place, the visited place sends a Credit Control Request (CCR) to the local, and judges the non-home network user; and forwarding the CCR to an attribution domain EPC simulation through DRA addressing according to a target domain, transferring the charging and strategy information after the attribution domain EPC simulation processing back to a visited EPC simulation, responding after the visited EPC simulation carries out user judgment, completing bearer establishment and realizing visited place access of a roaming user.
According to the research on roaming network architecture, service flow and roaming interface, the signaling flows of roaming S6a interface, S8 interface and S9 interface are developed, the user can realize the unaware automatic roaming switching during roaming, and the specific functions include: the functions of addressing International Mobile Subscriber Identity (IMSI), storing service network elements, canceling registration flow control and processing and the like are realized, and the mobility management of roaming users is completed; the selection mechanisms of the PGW, such as static configuration, dynamic analysis and the like of the PGW, are realized, and the load building of the roaming user is completed; and realizing the policy interaction between the V-PCRF (PCRF in the home PLMN) and the H-PCRF (PCRF in the visited PLMN), and finishing the policy control of the local exit of the roaming user.
Specifically, the roaming test procedure may be as follows. As shown in fig. 5, the LTE network includes: and main network elements such as MME, SGW, PGW, HSS, PCRF and the like in the network, and the network elements such as MME, HSS, PGW, PCRF and the like in the network are connected with the DRA. The DRA systems of the two LTE networks are intercommunicated through IPX, and the SPGW (SGW and PGW) is intercommunicated through a public network. According to the user service, roaming mode selection and the like, the user can be configured in advance, and the user can be determined to access the networking by using the home location or the roaming location. When the user of the home network roams to the visited network, the destination domain is generated according to the IMSI and sent to the DRA, and the DRA forwards a signaling to the HSS of the home domain according to the IMSI and the destination domain addressing, so that the authentication and registration functions of the roaming user are realized. When roaming networking adopts home location access, after registration is successful, HSS carries user data and carries PGW address of home location, visiting location network applies for bearing resource to PGW of home location according to obtained PGW address, and home location access of roaming processing is realized. When the roaming networking adopts visited place access, the PGW accessed to the visited place is borne, the PGW of the visited place sends a CCR request to the V-PCRF of the local place, the V-PCRF judges non-local network users, generates a destination domain according to IMSI, forwards the destination domain to the PCRF of the home domain through DRA addressing, the PCRF of the home domain transfers charging and strategy information back to the PCRF of the visited place after processing, the PCRF responds back to the PGW after user judgment, and the PGW completes bearing establishment to realize visited place access of services.
Fig. 6 is a flowchart of a cross-network service interworking testing method provided in an embodiment of the present invention. As shown in fig. 6, both the calling cross-network user and the called cross-network user in the cross-network service use the simulation system provided in the embodiment of the present invention to perform simulation of the mobile network.
In an optional implementation manner of the embodiment of the present invention, performing an inter-network service interworking test through a simulation system includes: a calling cross-network user determines a network entrance through a bearing channel simulated by an IMS (IP multimedia subsystem) at a calling side, and acquires the network entrance of a called cross-network user through the network entrance; sending call signaling information through a network inlet of a called cross-network user, performing number analysis to determine the address of the called cross-network user, and sending a cross-network service intercommunication request to the called cross-network user; when a called cross-network user receives a cross-network service intercommunication request, feeding back call signaling information to a calling cross-network user; the IP intercommunication of the calling side and the called side is realized through EPC simulation of the calling side and the called side, and the media information of the calling cross-network user is forwarded to the called cross-network user through a calling side base station, the EPC simulation of the calling side, the EPC simulation of the called side and the base station of the called side in sequence.
The embodiment of the invention realizes the service intercommunication among the cross-network users by constructing two sets of complete LTE simulation environments and configuring the networks with different affiliations. The dashed arrow line represents the signaling data flow diagram of the VOLTE call, and the UE at the calling side uses the IMS default bearer channel to find the entry of the IMS network: a P-CSCF network element; the P-CSCF forwards the service S-CSCF according to the calling user, and the service S-CSCF obtains the network entrance of the called domain according to the called address analysis: an I-CSCF network element. The I-CSCF acquires an S-CSCF served by a called party according to a called address, transfers Invite to a service S-CSCF, the S-CSCF analyzes a called number, acquires an IP address registered by the called party and sends a page to the P-CSCF, the P-CSCF sends the incoming call to called UE through a Gm interface, the called UE rings, a signaling message returns to a calling party according to an original path, the calling party answers, and a voice channel flows to a graph according to a solid line. Setting a route between a calling domain PGW network element and a called domain PGW network element to ensure media IP intercommunication, wherein the media flow of a calling party is that a calling party UE (user equipment) arrives at an eNB (evolved node B), arrives at an SGW (serving gateway) through an S1-U interface and then transfers to a calling party PGW; the calling PGW is routed to the called PGW, the called PGW forwards the media stream to the called SGW, and the called SGW forwards the media stream to the called eNB; therefore, the call is forwarded to the called UE, and high-definition communication between the calling and called users in different domains is realized.
In the technical scheme of the embodiment, a simulation system is used for carrying out service test of a mobile network, for example, a voice call test is carried out through the simulation system; or, carrying out a video call test through the simulation system; or, carrying out a voice-to-video test through a simulation system; or, roaming test is carried out through a simulation system; or, the cross-network service intercommunication test is carried out through the simulation system, the problem of simulation system test of the mobile network is solved, communication related service tests of users for web browsing, video watching, high-definition voice, video call service and the like are realized, and the effect of providing a research platform support for related researchers is achieved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An emulation system for a mobile network, the emulation system comprising: communication terminal simulation, communication base station simulation and core network simulation; the core network simulation comprises an evolved packet core network EPC simulation and a multimedia subsystem IMS simulation; wherein:
the communication terminal simulates the simulation of accessing a core network through a communication base station; the communication base station simulation is respectively in communication connection with EPC simulation and IMS simulation in the core network simulation;
and the communication terminal simulation, the communication base station simulation, the EPC simulation and the IMS simulation are pieced together and built through a mobile network open-source framework platform which respectively supports the communication terminal simulation, the communication base station simulation, the EPC simulation and the IMS simulation, so that an analog simulation system of the mobile network is generated.
2. The system of claim 1,
the communication terminal simulation and the communication base station simulation are simulated through an srsLTE platform; the EPC simulation is carried out through a nextEPC platform; the IMS simulation is performed through an OpenIMS platform.
3. The system of claim 1,
the EPC simulation comprises the following core network elements: a mobile management node function MME, a home subscriber server HSS, a serving gateway SGW, a public data network gateway PGW and a policy and charging rule function PCRF;
the IMS emulation includes the following core network elements: proxy call session control entity P-CSCF, query call session control entity I-CSCF, serving call session control entity S-CSCF and HSS.
4. A method for testing the service of a mobile network, applied to the simulation system according to any one of claims 1 to 3, the method comprising:
carrying out voice call test through the simulation system; or, carrying out a video call test through the simulation system; or, carrying out a voice-to-video test through the simulation system; or, the roaming test is carried out through the simulation system; or, the cross-network service intercommunication test is carried out through the simulation system.
5. The method of claim 4, wherein conducting a voice call test through the analog system comprises:
a first calling terminal of the voice call test initiates a session request through the EPC simulation;
the first calling terminal initiates a policy control and charging PCC process through the IMS simulation, executes voice special bearing establishment and resource reservation, and forwards the session request to a first called terminal of the voice call test;
the first called terminal receives the session request and responds to the session request;
according to the response, the first called terminal initiates a PCC flow through the IMS simulation, and executes voice special bearing establishment and resource reservation;
and the first calling terminal and the first called terminal carry out media negotiation and resource reservation, and when the resource reservation is successful, the first called terminal listens to the voice conversation.
6. The method of claim 4, wherein performing a video call test through the simulation system comprises:
a second calling terminal of the video call test initiates a call request through the EPC simulation;
the second calling terminal initiates a Policy Control and Charging (PCC) process through the IMS simulation, executes video call special bearing establishment and resource reservation, and forwards the call request to a second called terminal of the video call test;
the second called party receives the call request and responds to the call request;
according to the response, the second called terminal initiates a PCC flow through the IMS simulation, and executes the establishment of the video call special bearing and the resource reservation;
and the second calling terminal and the second called terminal carry out media negotiation and resource reservation, and when the resource reservation is successful, the second called terminal listens to the voice conversation.
7. The method of claim 5, wherein performing a voice-to-video test by the analog system comprises:
a third calling terminal of the voice-to-video test simulates and initiates a voice-to-video session request through the EPC;
the third calling terminal initiates a PCC flow through the IMS simulation, and initiates an authentication authorization request AAR, a re-authorization request RAR and an evolved radio access bearer E-RAB establishment request, executes voice-to-video bearer establishment, and forwards the voice-to-video session request to a third called terminal of the voice-to-video test;
the third called terminal receives the voice-to-video session request and performs a re-authorization response RAA for the voice-to-video session request;
according to the RAA, the third called terminal initiates a PCC flow through the IMS simulation, performs Radio Resource Control (RRC) connection, and executes voice-to-video special bearer establishment;
and the third calling terminal and the third called terminal carry out data transmission through a voice-to-video special bearer.
8. The method according to claim 4, characterized in that the home and visited places in the roaming test are both used for simulation of the mobile network by the simulation system according to any one of claims 1-3; routing agent nodes DRA are arranged in the networks of the home location and the visited location; the home DRA and the visited DRA are intercommunicated through an internet packet switching protocol IPX;
the roaming test is carried out through the simulation system, and the method comprises the following steps:
according to the roaming information, configuring a roaming user to adopt an attribution access networking or a visiting access networking;
when a roaming user roams to a visited network from a home network, generating a destination domain according to roaming user identification information, sending the destination domain to a home DRA, acquiring a roaming signaling determined by the home DRA according to the destination domain, and simulating authentication and registration of the roaming user in the EPC;
and networking access is carried out through EPC simulation according to home access networking or visited access networking adopted by a roaming user.
9. The method of claim 8, wherein simulating networking access through the EPC according to home access networking or visited access networking adopted by a roaming user comprises:
when a roaming user adopts home location access networking, user data and a home location address are carried through EPC simulation of the home location;
user data and an address of a home location are obtained through EPC simulation of a visited place, and a bearing resource is applied to a home domain to realize home location access of a roaming user; alternatively, the first and second electrodes may be,
when a roaming user adopts a visited place to access the networking, the load bearing is accessed to the visited place, the visited place sends a credit control request CCR to the local, and non-home network users are judged;
and forwarding the CCR to an attribution domain EPC simulation through DRA addressing according to a target domain, transferring the charging and strategy information after the attribution domain EPC simulation processing back to a visited EPC simulation, responding after the visited EPC simulation carries out user judgment, completing bearer establishment and realizing visited place access of a roaming user.
10. The method according to claim 4, characterized in that, in the cross-network service, both the calling cross-network user and the called cross-network user adopt the simulation system according to any one of claims 1-3 to perform simulation of the mobile network;
the cross-network service intercommunication test is carried out through the simulation system, and the method comprises the following steps:
a calling cross-network user determines a network entrance through a bearing channel simulated by an IMS (IP multimedia subsystem) at a calling side, and acquires the network entrance of a called cross-network user through the network entrance;
sending call signaling information through a network inlet of a called cross-network user, performing number analysis to determine the address of the called cross-network user, and sending a cross-network service intercommunication request to the called cross-network user;
when a called cross-network user receives a cross-network service intercommunication request, feeding back call signaling information to a calling cross-network user;
the IP intercommunication of the calling side and the called side is realized through EPC simulation of the calling side and the called side, and the media information of the calling cross-network user is forwarded to the called cross-network user through a calling side base station, the EPC simulation of the calling side, the EPC simulation of the called side and the base station of the called side in sequence.
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