Method for unified user IP address allocation in scenarios of self-organizing network converged access to 5G network

Abstract

The present invention discloses a method for unified user IP address allocation in a scenario of self-organizing network converged access to a 5G network, and relates to the field of 5G communications. In the present invention, when a remote self-organizing terminal accesses AMF through a relay terminal, AMF obtains user contract data from UDM according to the user identifier, including the user's IP address UE IP, and AMF sends a 5G NAS authentication request message through N3IWF, including a newly added UE IP information element for allocating the user's IP address. N3IWF transparently transmits the 5G NAS authentication request message to the remote self-organizing terminal through a tunnel. After receiving the message, the remote self-organizing terminal obtains the UE IP and uses the IP to initiate subsequent services. The present invention adds a new UE IP information element to the non-3GPP access scheme in the 3GPP standard, which solves the problem that the terminal's IP address is not uniformly allocated and cannot be bound to the user identifier in the scenario of self-organizing network converged access; it has the characteristics of low complexity, and only one UE IP information element is added, so that the user IP address is uniformly managed by the 5G network in the scenario of self-organizing network converged access.

Description

Technical Field

[0001] The present invention relates to the field of 5G communications, and in particular to a method for allocating unified user IP addresses in a scenario where a self-organizing network is integrated with a 5G network. Background Art

[0002] The application of 5G technology has greatly promoted the development of various industries and has increasingly affected the field of special communications. Terminal self-organizing networks have a wide range of applications in the field of special communications. How to achieve the integration of terminal self-organizing networks and 5G networks is an important issue that needs to be solved urgently.

[0003] At present, the non-3GPP access technology (N3IWF) in the 3GPP standard is generally used to realize the terminal self-organizing network integrated access to the 5G network: when the remote self-organizing network terminal cannot access the 5G network, it accesses the 5G network through the self-organizing network and the relay terminal with 5G network. In order to realize the management of the remote terminal by the 5G network, the remote self-organizing network terminal needs to establish a tunnel to the N3IWF through the relay terminal, and then transmit the 5G NAS message through this tunnel to complete the access control and session management functions of the 5G network to the remote self-organizing network terminal. For special applications, the user IP address generally needs to be bound to the user identity (SUPI).

[0004] According to the existing 3GPP standards, for non-3GPP access terminals such as ad hoc networks, user IP addresses are allocated by N3IWF when tunnels are established and cannot be associated with user identities; user session IP addresses are allocated by SMF when IP type sessions are established and can be associated with user identities, but IP addresses cannot be allocated for Ethernet type sessions. The IP addresses allocated by N3IWF and SMF are independent of each other, resulting in inconsistent user IP address allocation, insufficient network security, and complex management. Summary of the invention

[0005] In view of this, the present invention proposes a method for unified user IP address allocation in the scenario of self-organizing network converged access to 5G network. The method has the characteristics of low complexity, only adds one UE IP information element, and realizes the unified management of user IP addresses by 5G network in the scenario of self-organizing network converged access.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for unifying user IP address allocation in a scenario where a self-organizing network converges and accesses a 5G network, comprising the following steps;

[0008] Step 1: When there is no 5G signal, the remote self-organizing network terminal is connected to a relay terminal with 5G signal through the self-organizing network, and accesses the 5G network through the relay terminal;

[0009] Step 2: The remote ad hoc network terminal establishes an IPsec security association with the N3IWF;

[0010] Step 3: The remote ad hoc terminal sends an IKE authentication request to N3IWF, requesting 5G EAP authentication;

[0011] Step 4: N3IWF replies an IKE authentication response to the remote ad hoc network terminal and starts 5G EAP authentication;

[0012] Step 5: The remote self-organizing terminal sends a 5G EAP authentication response to the N3IWF, where the 5G EAP authentication response includes a 5G NAS registration request message of the remote self-organizing terminal, and the 5G NAS registration request message includes a user identifier of the remote self-organizing terminal;

[0013] Step 6: N3IWF selects AMF and transparently transmits the 5G NAS registration request message to AMF;

[0014] Step 7: If the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a temporary user identifier, the AMF obtains the user permanent identifier from the remote self-organizing terminal through the N3IWF, and executes step 8. If the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a permanent user identifier, directly execute step 8;

[0015] Step 8: AMF obtains the user's 5G NAS authentication information from AUSF based on the user's permanent identifier;

[0016] Step 9: AMF identifies the user as a remote ad hoc network terminal accessed through N3IWF based on the user's 5G NAS authentication information, and obtains the user's subscription data from UDM, including the user's IP address UE IP;

[0017] Step 10: AMF transparently transmits a 5G NAS authentication request message to the remote self-organizing network terminal through N3IWF, where the 5G NAS authentication request message includes the IP address UE IP of the remote self-organizing network terminal;

[0018] Step 11: After the remote self-organizing network terminal obtains the IP address information, it uses the IP address to initiate subsequent services and complete the unified user IP address allocation in the self-organizing network converged access 5G network scenario.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention compared with the prior art are:

[0020] 1. The present invention adds a new UE IP information element to the non-3GPP access solution in the 3GPP standard, thereby solving the problem that the IP address allocation of the terminal is not uniform and cannot be bound to the user identity in the scenario of self-organizing network converged access.

[0021] 2. The present invention has the characteristics of low complexity, only one UE IP cell is added, and other cells adopt standard protocols. The AMF and the terminal only need to be slightly modified to achieve the goal. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall flow chart of the method for unified user IP address allocation in the scenario of self-organizing network integrated access to 5G network in an embodiment of the present invention.

[0023] Figure 2 The figure is a schematic diagram of a 5G NAS authentication request message including a UE IP information element in an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the definition of UE IP information element in an embodiment of the present invention.

[0025] Figure 4 The figure is a schematic diagram of the detailed definition of the UE IP information element in the embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] A method for unifying user IP address allocation in the scenario of self-organizing network converged access to 5G network, such as Figure 1 As shown, the following steps are included;

[0028] Step 1: When there is no 5G signal, the remote self-organizing network terminal is connected to a relay terminal with 5G signal through the self-organizing network, and accesses the 5G network through the relay terminal;

[0029] Step 2: The remote ad hoc terminal establishes an IPsec (IP security) security association with the N3IWF (non-3GPP interworking function);

[0030] Step 3: The remote ad hoc terminal sends an IKE (Internet Key Exchange) authentication request to the N3IWF, requesting 5G EAP (Extensible Authentication Protocol) authentication;

[0031] Step 4: N3IWF replies an IKE authentication response to the remote ad hoc network terminal and starts 5G EAP authentication;

[0032] Step 5: The remote self-organizing terminal sends a 5G EAP authentication response to the N3IWF, wherein the 5G EAP authentication response includes a 5G NAS (non-access layer) registration request message of the remote self-organizing terminal, and the 5GNAS registration request message includes a user identifier of the remote self-organizing terminal;

[0033] In steps 6a and 6b, N3IWF selects AMF (Access and Mobility Management Function) and transparently transmits the 5G NAS Registration Request message to AMF.

[0034] In steps 7a and 7b, if the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a temporary user identifier, the AMF obtains the permanent user identifier from the remote self-organizing terminal through the N3IWF, and executes step 8. If the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a permanent user identifier, directly execute step 8;

[0035] Step 8a, AMF obtains the user's 5G NAS authentication information from AUSF (Authentication Server Function) based on the user's permanent identity;

[0036] Step 8b: AMF identifies the user as a remote ad hoc network terminal accessed through N3IWF based on the user's 5G NAS authentication information, and obtains the user's subscription data from UDM (unified data management), including the user's IP address UE (user equipment) IP;

[0037] Specifically, Figure 3 , Figure 4 Shown is a schematic diagram of the definition of UE IP information element and a detailed definition diagram;

[0038] In steps 8c and 8d, AMF transparently transmits the 5G NAS authentication request message to the remote ad hoc terminal through N3IWF, such as Figure 2 As shown, the 5G NAS authentication request message includes the IP address UE IP of the remote self-organizing network terminal;

[0039] Step 9: After the remote self-organizing network terminal obtains the IP address information, it uses the IP address to initiate subsequent services and complete the unified user IP address allocation in the self-organizing network converged access 5G network scenario.

[0040] In summary, the present invention adds a new UE IP information element to the non-3GPP access solution in the 3GPP standard, solving the problem that the IP address allocation of the terminal is not uniform and cannot be bound to the user identity in the scenario of self-organizing network converged access; it has the characteristics of low complexity, only one UE IP information element is added, and other information elements adopt standard protocols. It can be implemented with only a small modification of the AMF and the terminal.

[0041] Those skilled in the art will appreciate that the embodiments described are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to the embodiments described. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for allocating unified user IP addresses in a scenario where a self-organizing network is integrated and accessed into a 5G network, characterized in that: The steps include: Step 1: When there is no 5G signal, the remote self-organizing network terminal is connected to a relay terminal with 5G signal through the self-organizing network, and accesses the 5G network through the relay terminal; Step 2: The remote ad hoc network terminal establishes an IPsec security association with the N3IWF; Step 3: The remote ad hoc terminal sends an IKE authentication request to N3IWF, requesting 5G EAP authentication; Step 4: N3IWF replies an IKE authentication response to the remote ad hoc network terminal and starts 5G EAP authentication; Step 5: The remote self-organizing terminal sends a 5G EAP authentication response to the N3IWF, where the 5G EAP authentication response includes a 5G NAS registration request message of the remote self-organizing terminal, and the 5G NAS registration request message includes a user identifier of the remote self-organizing terminal; Step 6: N3IWF selects AMF and transparently transmits the 5G NAS registration request message to AMF; Step 7: If the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a temporary user identifier, the AMF obtains the user permanent identifier from the remote self-organizing terminal through the N3IWF, and executes step 8. If the user identifier of the remote self-organizing terminal contained in the 5G NAS registration request message is a permanent user identifier, directly execute step 8; Step 8: AMF obtains the user's 5G NAS authentication information from AUSF based on the user's permanent identity; Step 9: AMF identifies the user as a remote ad hoc network terminal accessed through N3IWF based on the user's 5G NAS authentication information, and obtains the user's subscription data from UDM, including the user's IP address UE IP; Step 10: AMF transparently transmits a 5G NAS authentication request message to the remote self-organizing network terminal through N3IWF, where the 5G NAS authentication request message includes the IP address UE IP of the remote self-organizing network terminal; Step 11: After the remote self-organizing network terminal obtains the IP address information, it uses the IP address to initiate subsequent services and complete the unified user IP address allocation in the self-organizing network converged access 5G network scenario.

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