An interoperable system and method for large tower broadcast and 5G core network

Abstract

The present invention provides an interoperability system and method for large tower broadcast and a 5G core network, belonging to the field of wireless communication technology. The interoperability system includes: a 5G base station and a 5G large tower broadcast base station; the 5G base station establishes a multicast broadcast service session with the 5G core network via an NG interface; the 5G base station is configured to obtain multicast broadcast service data from the 5G core network; the 5G large tower broadcast base station is connected to the 5G base station via an Xn-C interface and an Xn-U interface; the 5G large tower broadcast base station establishes a multicast broadcast service data forwarding session with the 5G base station via the Xn-C interface, obtains multicast broadcast service data from the 5G base station via the Xn-U interface, and generates and broadcasts large tower broadcast air interface data based on a locally pre-configured frequency and serving cell. Without changing the 5G core network structure, interoperability between large tower broadcast and the 5G core network is achieved, and single-frequency networking for large tower broadcast is supported.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, and in particular to an interoperability system and method based on access network-based large tower broadcasting and a 5G core network. Background Art

[0002] The services carried by 5G broadcasting and television systems focus on audio, video, and data applications. They can provide common content and public services via large tower broadcasts, as well as hotspot regional broadcasts and value-added services via small tower broadcasts. They can also flexibly connect with third-party service providers based on user preferences, offering new media services and content in an OTT (Over The Top, where internet companies bypass operators) format. 5G broadcasting and television systems can also be incorporated into emergency broadcast systems. Large towers refer to broadcasting and television transmission towers, which feature high power and high-site locations. They are suitable for delivering live TV programs and large-scale data push over a wide coverage area, with a coverage range of over 100 kilometers.

[0003] Tower broadcasting refers to Enhanced TV (EnTV). Currently, interoperability methods for access network-based tower broadcasting and 5G core networks can be categorized into three types: service layer aggregation, adding core network elements, and access network-based solutions. However, these three solutions require changes to the overall structure of the 5G core network, involving revisions to many relevant protocols and standards within the 5G core network. These approaches are unlikely to gain standard support in the short term (before Rel-19), further complicating the 5G core network structure and increasing costs. Furthermore, they are unable to fulfill tower broadcasting functions such as single-frequency networks.

[0004] Therefore, there is an urgent need for an interoperability method that can maintain a standard structure, have no impact on the core network, and have no impact on existing large tower broadcast terminals. Summary of the Invention

[0005] The purpose of the present invention is to provide an interoperable system and method for large tower broadcasting and 5G core network, which can realize the interoperability between large tower broadcasting and 5G core network without changing the structure of 5G core network, and support the single-frequency networking function of large tower broadcasting.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An interoperable system for large tower broadcasting and 5G core network, comprising: a 5G base station and a 5G large tower broadcasting base station;

[0008] The 5G base station is connected to the 5G core network via the NG interface; the 5G base station establishes a multicast broadcast service session with the 5G core network via the NG interface; the 5G base station is used to obtain multicast broadcast service data from the 5G core network;

[0009] The 5G tower broadcast base station is connected to the 5G base station through the Xn-C interface and the Xn-U interface;

[0010] The 5G tower broadcast base station is used to establish a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface, obtain multicast broadcast service data from the 5G base station through the Xn-U interface, and generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast.

[0011] Optionally, the 5G large tower broadcast base station includes a centralized unit and multiple distributed units;

[0012] The centralized unit is connected to the 5G base station via the Xn-C interface and the Xn-U interface; the centralized unit is connected to each distributed unit via the F1-M interface; the F1-M interface is an interface that supports the single frequency network mode of large tower broadcasting based on the F1 interface;

[0013] The centralized unit is configured to establish a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface, and obtain multicast broadcast service data from the 5G base station through the Xn-U interface;

[0014] Each distribution unit is used to generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast.

[0015] Optionally, the F1-M interface includes a control plane and a user plane; the centralized unit includes a control plane part and a user plane part;

[0016] The control plane part is connected to each distribution unit through the control plane of the F1-M interface; the user plane part is connected to each distribution unit through the user plane of the F1-M interface; the control plane part is connected to the user plane part through the E1 interface.

[0017] To achieve the above object, the present invention also provides the following solution:

[0018] A method for interoperating between a large tower broadcast and a 5G core network, based on the above-mentioned interoperating system between the large tower broadcast and the 5G core network, the method for interoperating between the large tower broadcast and the 5G core network includes:

[0019] A multicast broadcast service session is established between the 5G core network and the 5G base station via the NG interface;

[0020] Transmitting multicast broadcast service data to 5G base stations through the application server of the 5G core network;

[0021] Establish an interconnected Xn interface between the 5G tower broadcast base station and the 5G base station;

[0022] The 5G tower broadcast base station applies to the 5G base station for a multicast broadcast service data forwarding session request between the 5G base station and the 5G tower broadcast base station based on the Xn interface;

[0023] After receiving the multicast broadcast service data forwarding session request, the 5G base station establishes a multicast broadcast service data forwarding session with the 5G tower broadcast base station;

[0024] The 5G tower broadcast base station obtains the multicast broadcast service data from the 5G base station via the Xn-U interface;

[0025] The 5G tower broadcast base station generates the air interface data of the tower broadcast according to the multicast broadcast service data and the locally pre-configured frequency and service cell, and broadcasts it.

[0026] Optionally, before establishing a multicast broadcast service session between the 5G core network and the 5G base station through the NG interface, the interoperability method between the large tower broadcast and the 5G core network further includes:

[0027] The 5G base station registers and configures with the 5G core network.

[0028] Optionally, the 5G core network includes an application server, an access and mobility management functional module, a multicast broadcast service functional module, a multicast broadcast session management functional module, and a multicast broadcast user plane functional module;

[0029] The 5G core network and the 5G base station establish a multicast broadcast service session through the NG interface, specifically including:

[0030] The application server sends session description information to the multicast broadcast service function module; the session description information includes service type, service quality requirements, user terminal indication, multicast broadcast service area, multicast broadcast service session start time, multicast broadcast service session end time, and multicast broadcast service session status; the multicast broadcast service area includes 5G base stations and 5G large tower broadcast base stations;

[0031] The multicast broadcast service function module sends a multicast broadcast service session creation request to the multicast broadcast session management function module according to the session description information, requesting the multicast broadcast session management function module to reserve entry resources for the multicast broadcast service session;

[0032] The multicast broadcast session management function module requests the multicast broadcast user plane function module to reserve data plane entry resources;

[0033] The multicast broadcast user plane function module selects a data entry address and allocates a tunnel endpoint for the 5G base station to forward data;

[0034] The multicast broadcast session management function module sends a multicast broadcast service session establishment message to the access and mobility management function module;

[0035] The access and mobility management function module sends the multicast broadcast service session establishment message to the 5G base station;

[0036] The 5G base station configures the multicast broadcast service session according to the multicast broadcast service session establishment message, and determines the cells and frequencies within the multicast broadcast service area according to the pre-configuration.

[0037] Optionally, the multicast broadcast service session creation request includes: a multicast broadcast service session number, a service type, a temporary mobile group identity (TMGI) allocation indication, a multicast broadcast service area, and an ingress transport address request indication.

[0038] Optionally, the multicast broadcast service session establishment message includes: TMGI, data transmission multicast address, quality of service configuration file and multicast broadcast service area.

[0039] According to a specific embodiment provided by the present invention, the present invention discloses the following technical effects: the interoperable system of the tower broadcast and the 5G core network includes a standard 5G base station and a 5G tower broadcast base station. The standard 5G base station establishes a multicast broadcast service session with the 5G core network via the NG interface. The standard 5G base station obtains multicast broadcast service data from the 5G core network. The 5G tower broadcast base station is connected to the standard 5G base station via the Xn-C interface and the Xn-U interface. The 5G tower broadcast base station establishes a multicast broadcast service data forwarding session with the standard 5G base station via the Xn-C interface, obtains multicast broadcast service data from the standard 5G base station via the Xn-U interface, and generates and broadcasts tower broadcast air interface data based on the locally pre-configured frequency and service cell. The standard network topology of the 5G system is adopted. The interoperability between the tower broadcast and the 5G core network is completed in the access network based on the standard interface (Xn interface) across 5G base stations. This has no impact on the 5G core network and supports the single-frequency networking function of the tower broadcast. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a structural diagram of the first existing interoperability method based on the service layer aggregation solution;

[0042] Figure 2A block diagram of the network element structure that provides multicast broadcast services for the second existing interoperability method;

[0043] Figure 3 This is a block diagram of the MBS service interoperation based on 5GC and Rel-16 EnTV for the second existing interoperability method.

[0044] Figure 4 Add a structural block diagram of core network elements to the existing second interoperability method;

[0045] Figure 5 A structural diagram that adds core network element functions to the existing second interoperability method;

[0046] Figure 6 This is a structural diagram of the third existing interoperability method based on the access network solution;

[0047] Figure 7 This is a structural diagram of 5GC and NG-RAN;

[0048] Figure 8 A structural diagram of the interoperable system provided by the present invention;

[0049] Figure 9 This is a structural diagram of the 5G large tower broadcast base station in the present invention;

[0050] Figure 10 is a flow chart of the interoperability method of the present invention;

[0051] Figure 11 Schematic diagram of the multicast broadcast service session establishment process. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] The purpose of the present invention is to provide an interoperable system and method for large tower broadcasting and 5G core network, so as to realize the interoperability between large tower broadcasting and 5G core network without changing the structure of 5G core network.

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] First, we will introduce three interoperability methods between the access network-based tower broadcast and the 5G core network:

[0056] (1) The service layer aggregation solution typically adopts the structure given in the 3GPP standard, such as Figure 1 This method requires adding a combined MBSF (Multicast / Broadcast Service Function) and BM-SC network element function, and must support the LET (Long Term Evolution) core network, resulting in a complex structure and high costs.

[0057] (2) Solutions that add core network elements or add NR (New Radio) core network element functions, typically Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The structure given. Figure 2 In the solution, the broadcast and multicast functions of NRMBS (muticast-broadcast services) are completed by adding relevant network elements, but it cannot support Rel-16EnTV and cannot complete the functions of large tower broadcasting such as single frequency network. Figure 3 In the solution, the service layer is based on Figure 2 In the core network transport layer: 1. Add the MB-UPF (Multicast / Broadcast User Plane Function) network element, which needs to support EnTVRAN's user plane interface M1. 2. Add the MB-SMF (Multicast / Broadcast Session Management Function) network element, and merge the control plane message interface M3 with the standard 5GC network element AMF (Access and Mobility Management Function). 3. Add the AMF function to support EnTVRAN's control plane interface M3. Figure 4 and Figure 5 In the solution, the service layer is based on Figure 2 Solution. In the core network transport layer: 1. Add the XCF (XControlplanefunction, a dedicated control plane for 5G broadcast) network element or add the XCF function to the standard SMF (SessionManagementfunction) network element and AF network element to support control information broadcast by large towers; 2. Add the XUF (XUserplanefunction, a user plane for 5G broadcast) network element or add the XUF function to the standard UPF (TheUserplanefunction, user plane function) network element to support user plane data broadcast by large towers. Figure 3 and Figure 4 All the solutions are based on adding 5G core network elements or network element functions to support large tower broadcast services. Since it involves changes to the overall structure of the 5GC core network and the revision of many related protocols and standards in the 5G core network, it is difficult to obtain standard support in the short term (before Rel-19).

[0058] (3) The access network-based solution achieves Rel-16EnTV interoperability by changing the access network elements, typically Figure 6 The structure given. Figure 6 In the solution, in the core network transport layer: the interfaces N2 / N3 of the 5GC-RAN (wireless access network) in the 5GC core need to be equipped with the function of supporting the Rel-16 EnTV air interface; EnTVRAN needs to support the function of NG-RAN including the EnTV air interface. Although this solution is based on the 5GS and Rel-16 EnTV fusion method of the 5GC access network, if large-scale single-frequency network support is to be achieved, the N2 / N3 interfaces need to be upgraded. In fact, the network element functions of the control plane and data plane of the core transport layer of 5GS also need to be modified. The time cost is high, and like the solution in category (2), it is difficult to obtain standard support in a short period of time.

[0059] In summary, although the above three 5GS and EnTV tower broadcast interoperability solutions generally conform to the structure of the existing 5GS standard, they will have different degrees of impact on the 5GS core network (the service layer solution and the core network solution require the addition of core network elements or the functions of existing core network elements, and the access network solution requires not only the upgrade of Ng-eNB, but also the upgrade of UE (User Experience, user terminal)). In the standards before R19, they will clearly not be supported.

[0060] The 3Gpp standard provides an overall framework diagram of NR and NG-RAN, such as Figure 7 As shown in the figure, it can be seen that there are two ways for LTE-based base stations to access the 5GS core network in the standard. One of the ways is to directly access the 5GS core network based on the NG interface in the figure, which is also Figure 5 The standard basis for the interoperability solution between the large tower broadcast and 5GS based on the access network; the other way is to indirectly access the 5GS core network based on the Xn interface in the figure, which is the standard basis of the present invention.

[0061] Example 1

[0062] like Figure 8As shown, the interoperable system between the large tower broadcast and 5G core network provided in this embodiment includes: a 5G base station gNB and a 5G large tower broadcast base station 5GTB_gNB. Specifically, the 5G base station is a standard 5G base station. The 5G large tower broadcast base station is a base station that supports large tower broadcast.

[0063] The 5G base station gNB is connected to the 5G core network via the NG interface. The 5G base station gNB establishes a multicast broadcast service session with the 5G core network via the NG interface. The 5G base station gNB is configured to obtain multicast broadcast service data from the 5G core network. The 5G base station's function is to interoperate with the 5G core network via the NG interface and relay service flows from the 5G core network to the main tower broadcast.

[0064] The 5G large tower broadcast base station 5GTB_gNB is connected to the 5G base station gNB via the Xn-C interface and the Xn-U interface. Xn-C is the control plane interface (implementing functions such as interface management and mobility management), and Xn_U is the user plane interface (implementing functions such as data transmission, forwarding, and flow control).

[0065] The 5G tower broadcast base station 5GTB_gNB is used to establish a multicast broadcast service data forwarding session with the 5G base station gNB through the Xn-C interface, obtain multicast broadcast service data from the 5G base station gNB through the Xn-U interface, and generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast.

[0066] Specifically, the 5G large tower broadcast base station 5GTB_gNB adopts a standard-based CU and DU separation. That is, the 5G large tower broadcast base station 5GTB_gNB includes 5GTB_gNB-CU (5Gterrestrial broadcastgNBcentralizedUnit, centralized unit) and multiple 5GTB_gNB-DU (5GterrestrialbroadcastgNBDistributedUnit, distributed units). Among them, the centralized unit 5GTB_gNB-CU implements non-real-time wireless high-layer protocol stack functions, while also supporting the sinking of some core network functions and the deployment of 5G terrestrial broadcast application services. The distributed unit 5GTB_gNB-DU mainly completes the physical layer functions and the MAC (Media Access Control, media access control layer) layer functions with real-time requirements.

[0067] The centralized unit is connected to the 5G base station via the Xn-C and Xn-U interfaces. It is also connected to each distributed unit via the F1-M interface. The F1-M interface is an upgraded version of the F1 interface used for large tower broadcasting, incorporating protocols such as single frequency network control to support the single frequency network mode of large tower broadcasting.

[0068] The centralized unit is used to establish a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface, and obtain multicast broadcast service data from the 5G base station through the Xn-U interface.

[0069] Each distribution unit is used to generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast.

[0070] Further, such as Figure 9 As shown, the F1-M interface includes the control plane F1-MC and the user plane F1-MU. The centralized unit includes the control plane portion 5GTB-gNB-CU-CP and the user plane portion 5GTB-gNB-CU-UP. The control plane F1-MC performs functions such as system information management and F1 interface management. The user plane F1-MU performs user data transmission.

[0071] The control plane part 5GTB-gNB-CU-CP is connected to each distributed unit 5GTB_gNB_DU via the control plane F1-MC of the F1-M interface. The user plane part 5GTB-gNB-CU-UP is connected to each distributed unit 5GTB_gNB_DU via the user plane F1-MU of the F1-M interface. The control plane part 5GTB-gNB-CU-CP is connected to the user plane part 5GTB-gNB-CU-UP via the E1 interface.

[0072] The 5G large tower broadcast base station 5GTB_gNB completes the single frequency network function of large tower broadcasting by separating CU and DU.

[0073] This solution adopts the standard 5GS network topology and interoperates between 5G tower broadcast and the 5GS core network based on a standard interface (Xn interface) across gNBs in the access network. This solution has no impact on the 5GS core network and eliminates the need for specialized network elements or custom upgrades to general-purpose network elements. It fully complies with existing 3GPP standards and supports single-frequency tower broadcast networking.

[0074] Example 2

[0075] This embodiment provides an interoperability method between a large tower broadcast and a 5G core network based on the interoperability system provided in the first embodiment.

[0076] The standard 5G core network includes an application server (Application Function), an AMF (Access and Mobility Management Function) module, an MBSF (Multicast / Broadcast Service Function) module, an MB-SMF (Multicast / Broadcast Session Management Function) module, an MB-UPF (Multicast / Broadcast User Plane Function) module and multiple standard network elements.

[0077] like Figure 10 As shown, the interoperability method between the large tower broadcast and the 5G core network provided in this embodiment includes:

[0078] S1: The 5G base station registers and configures with the 5G core network. Specifically, the 5G base station gNB in ​​the interoperable system of Example 1 completes registration and configuration with the 5GC (5G Core) according to the standard process of 5GS, and obtains the device IP address accessible to the 5GC.

[0079] S2: A multicast broadcast service session is established between the 5G core network and the 5G base station through the NG interface.

[0080] Further, if Figure 11 As shown, step S2 specifically includes:

[0081] ①: The AF sends session description information to the MBSF module. This session description information includes the service type (broadcast), QoS (Quality of Service) requirements, UE indication, MBS area, MBS session start time, MBS session end time, and MBS session status. The MBS area includes 5G base stations and 5G large tower broadcast base stations. The MBS session status is active or inactive. The MBSF authenticates the AF.

[0082] ② Based on the session description information, the MBSF module sends a multicast broadcast service session creation request to the MB-SMF module, requesting the MB-SMF module to reserve entry resources for the multicast broadcast service session. The multicast broadcast service session creation request includes the multicast broadcast service session number, service type, TMGI (Temporary Move Group ID) allocation indication, and an MBS region and entry transport address request indication. Specifically, the MBSF module selects the MB-SMF module as the control entry for the MBS session and sends the MBS session creation request to the MB-SMF module.

[0083] ③ The MB-SMF module requests the MB-UPF module to reserve data plane ingress resources. The MB-UPF module selects the data ingress address (IP address and port) and allocates a tunnel endpoint for the 5G base station gNB to forward data. This information is returned back to the AF, where it is available to each network element.

[0084] (4) The MB-SMF module sends a multicast broadcast service session establishment message to the AF module. The multicast broadcast service session establishment message includes: TMGI, data transmission multicast address, QoS profile, MBS area, and MBSF SAID. The data transmission multicast address includes the address of the interoperable system provided in Example 1. The MBS area includes the 5G base station gNB in ​​Example 1.

[0085] ⑤ The AMF module sends the multicast broadcast service session establishment message to the 5G base station. Specifically, the AMF module selects a target base station based on the MBS area and sends an MBS session establishment message to the target base station. The target base station includes the 5G base station gNB in ​​Example 1.

[0086] The 5G base station gNB configures the MBS session according to the multicast broadcast service session establishment message, stores the TMGI, QoS profile and MBSFSAID, and uses the MBSFSAID to determine the cell and frequency within the MBS area according to the pre-configuration.

[0087] S3: The 5G core network's application server transmits the multicast broadcast service data to the 5G base station. Specifically, the AF begins transmitting the multicast broadcast service data. The MB-UPF transmits the multicast broadcast service data to the 5GC and the 5G base station gNB in ​​Example 1 via the N3mb interface.

[0088] S4: An Xn interface is established between the 5G tower broadcast base station 5GTB_gNB and the 5G base station gNB. Specifically, the 5G tower broadcast base station 5GTB_gNB requests an Xn interface establishment request from the 5G base station gNB via the Xn-C interface. The Xn interface is established between the 5G base station gNB and the 5G tower broadcast base station 5GTB_gNB.

[0089] S5: The 5G tower broadcast base station 5GTB_gNB applies to the 5G base station gNB for an MBS data forwarding session request between the 5G base station gNB and the 5G tower broadcast base station 5GTB_gNB based on the Xn interface.

[0090] S6: After receiving the MBS data forwarding session request, the 5G base station gNB establishes a multicast broadcast service data forwarding session with the 5G large tower broadcast base station 5GTB_gNB.

[0091] S7: The 5G large tower broadcast base station 5GTB_gNB obtains multicast broadcast service data from the 5G base station gNB through the Xn-U interface.

[0092] S8: The 5G gNB generates and broadcasts the gNB's air interface data based on the multicast service data and the locally preconfigured frequency and serving cell. Finally, the UE receives the gNB's broadcast signal.

[0093] The present invention can support the interoperability of large-scale tower broadcasting and 5GS core network without any impact on the 5G core network and without the need to add service network elements or upgrade the network element functions. It adopts standard interfaces and achieves the coverage of large-scale tower broadcasting, provides a wide range of low-cost live TV programs and large-scale data push, public data push and other business services, and provides single-frequency networking functions, thereby improving frequency utilization efficiency.

[0094] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0095] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An interoperable system between a large tower broadcast and a 5G core network, characterized in that: The interoperable system between the tower broadcast and the 5G core network includes: a 5G base station and a 5G tower broadcast base station; The 5G base station is connected to the 5G core network via the NG interface; the 5G base station establishes a multicast broadcast service session with the 5G core network via the NG interface; the 5G base station is used to obtain multicast broadcast service data from the 5G core network; The 5G tower broadcast base station is connected to the 5G base station through the Xn-C interface and the Xn-U interface; The 5G tower broadcast base station is used to establish a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface, obtain multicast broadcast service data from the 5G base station through the Xn-U interface, and generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast; The 5G large tower broadcast base station 5GTB_gNB completes the single frequency network function of large tower broadcast by separating CU and DU; The 5G tower broadcast base station includes a centralized unit and multiple distributed units; The centralized unit is connected to the 5G base station via the Xn-C interface and the Xn-U interface; the centralized unit is connected to each distributed unit via the F1-M interface; the F1-M interface is an interface that supports the single frequency network mode of large tower broadcasting based on the F1 interface; The centralized unit is configured to establish a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface, and obtain multicast broadcast service data from the 5G base station through the Xn-U interface; Each distribution unit is used to generate air interface data for tower broadcast according to the local pre-configured frequency and service cell for broadcast.

2. The interoperable system between large tower broadcast and 5G core network according to claim 1, characterized in that: The F1-M interface includes a control plane and a user plane; the centralized unit includes a control plane part and a user plane part; The control plane part is connected to each distribution unit through the control plane of the F1-M interface; the user plane part is connected to each distribution unit through the user plane of the F1-M interface; the control plane part is connected to the user plane part through the E1 interface.

3. A method for interoperation between a large tower broadcast and a 5G core network, based on the interoperation system between a large tower broadcast and a 5G core network according to any one of claims 1-2, characterized in that: The interoperability method between the large tower broadcast and the 5G core network includes: A multicast broadcast service session is established between the 5G core network and the 5G base station via the NG interface; Transmitting multicast broadcast service data to 5G base stations through the application server of the 5G core network; Establish an interconnected Xn interface between the 5G tower broadcast base station and the 5G base station; The 5G tower broadcast base station applies to the 5G base station for a multicast broadcast service data forwarding session request between the 5G base station and the 5G tower broadcast base station based on the Xn interface; After receiving the multicast broadcast service data forwarding session request, the 5G base station establishes a multicast broadcast service data forwarding session with the 5G tower broadcast base station; The 5G tower broadcast base station obtains the multicast broadcast service data from the 5G base station via the Xn-U interface; The 5G tower broadcast base station generates the air interface data of the tower broadcast according to the multicast broadcast service data and the locally pre-configured frequency and service cell, and broadcasts it.

4. The interoperability method between a large tower broadcast and a 5G core network according to claim 3, characterized in that: Before establishing a multicast broadcast service session between the 5G core network and the 5G base station through the NG interface, the interoperability method between the large tower broadcast and the 5G core network further includes: The 5G base station registers and configures with the 5G core network.

5. The interoperability method between a large tower broadcast and a 5G core network according to claim 3, characterized in that: The 5G core network includes an application server, an access and mobility management functional module, a multicast broadcast service functional module, a multicast broadcast session management functional module, and a multicast broadcast user plane functional module; The 5G core network and the 5G base station establish a multicast broadcast service session through the NG interface, specifically including: The application server sends session description information to the multicast broadcast service function module; the session description information includes service type, service quality requirements, user terminal indication, multicast broadcast service area, multicast broadcast service session start time, multicast broadcast service session end time, and multicast broadcast service session status; the multicast broadcast service area includes 5G base stations and 5G large tower broadcast base stations; The multicast broadcast service function module sends a multicast broadcast service session creation request to the multicast broadcast session management function module according to the session description information, requesting the multicast broadcast session management function module to reserve entry resources for the multicast broadcast service session; The multicast broadcast session management function module requests the multicast broadcast user plane function module to reserve data plane entry resources; The multicast broadcast user plane function module selects a data entry address and allocates a tunnel endpoint for the 5G base station to forward data; The multicast broadcast session management function module sends a multicast broadcast service session establishment message to the access and mobility management function module; The access and mobility management function module sends the multicast broadcast service session establishment message to the 5G base station; The 5G base station configures the multicast broadcast service session according to the multicast broadcast service session establishment message, and determines the cells and frequencies within the multicast broadcast service area according to the pre-configuration.

6. The interoperability method between a large tower broadcast and a 5G core network according to claim 5, characterized in that: The multicast broadcast service session creation request includes: a multicast broadcast service session number, a service type, a temporary mobile group identity TMGI allocation indication, a multicast broadcast service area, and an entry transport address request indication.

7. The interoperability method between a large tower broadcast and a 5G core network according to claim 5, characterized in that: The multicast broadcast service session establishment message includes: TMGI, data transmission multicast address, service quality configuration file and multicast broadcast service area.

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