CN115884104A - Interoperation system and method of tower broadcast and 5G core network - Google Patents
Interoperation system and method of tower broadcast and 5G core network Download PDFInfo
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- CN115884104A CN115884104A CN202211533287.5A CN202211533287A CN115884104A CN 115884104 A CN115884104 A CN 115884104A CN 202211533287 A CN202211533287 A CN 202211533287A CN 115884104 A CN115884104 A CN 115884104A
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Abstract
The invention provides a system and a method for interoperation between a tower broadcast and a 5G core network, belonging to the technical field of wireless communication, wherein the interoperation system comprises: 5G base stations and 5G tower broadcast base stations; the 5G base station establishes a multicast broadcast service session with the 5G core network through the NG interface; the 5G base station is used for acquiring multicast broadcast service data from a 5G core network; the 5G tower broadcast base station is connected with the 5G base station through an Xn-C interface and an Xn-U interface; the 5G big tower broadcast base station establishes a multicast broadcast service data forwarding session with the 5G base station through an Xn-C interface, acquires multicast broadcast service data from the 5G base station through an Xn-U interface, and generates empty data of big tower broadcast according to a local pre-configured frequency and a service cell for broadcasting. Under the condition of not changing the structure of the 5G core network, the interoperation of the tower broadcast and the 5G core network is realized, and the tower broadcast single-frequency networking function is supported.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a system and a method for interoperation of a tower broadcast and a 5G core network based on an access network.
Background
The service form carried by the 5G broadcast television system focuses on video and audio and data application, common content and public service can be provided through tower broadcast, hot spot area broadcast and value-added service can be provided through tower broadcast, a third party service provider can be flexibly connected according to user preference, and new media service and content are provided in an OTT (over the Top, internet company goes over operators) mode. Meanwhile, the 5G broadcast television system can be also incorporated into an emergency broadcast system. The large tower refers to a broadcast television transmitting tower, has the characteristics of high power and high site, is suitable for carrying out live broadcast television programs with wide coverage range and large-range data push, and can reach the coverage range of more than 100 kilometers.
The tower broadcast refers to EnTV (enhanced television broadcast), and currently, the interoperation methods of tower broadcast based on an access network and a 5G core network are classified into three categories: a service layer convergence scheme, a scheme for adding a core network element and a scheme based on an access network. However, the above three schemes need to change the overall structure of the 5G core network, which involves revising many relevant protocols and standards in the 5G core network, and it is difficult to obtain support on the standards in a short time (before Rel-19), and the structure of the 5G core network is more complicated, the cost is increased, and the function of tower broadcast such as a single frequency network cannot be completed.
Therefore, there is a need for an interoperation method that can maintain a standard structure, keep the core network from being affected, and keep the existing tower broadcast terminal from being affected.
Disclosure of Invention
The invention aims to provide a system and a method for interoperating a tower broadcast and a 5G core network, which can realize the interoperation of the tower broadcast and the 5G core network and support the single-frequency networking function of the tower broadcast under the condition of not changing the structure of the 5G core network.
In order to achieve the purpose, the invention provides the following scheme:
a tower broadcast and 5G core network interoperation system comprising: 5G base stations and 5G tower broadcast base stations;
the 5G base station is connected with a 5G core network through an NG interface; the 5G base station establishes a multicast broadcast service session with the 5G core network through an NG interface; the 5G base station is used for acquiring multicast broadcast service data from the 5G core network;
the 5G tower broadcast base station is connected with the 5G base station through an Xn-C interface and an Xn-U interface;
the 5G big tower broadcast base station is used for establishing a multicast broadcast service data forwarding session with the 5G base station through an Xn-C interface, acquiring multicast broadcast service data from the 5G base station through an Xn-U interface, and generating empty data of big tower broadcast according to a local pre-configured frequency and a service cell for broadcasting.
Optionally, the 5G tower broadcast base station includes a centralized unit and a plurality of distributed units;
the centralized unit is connected with the 5G base station through the Xn-C interface and the Xn-U interface; the centralized unit is connected with each distribution unit through an F1-M interface; the F1-M interface is an interface of a single frequency network mode supporting the tower broadcasting on the basis of the F1 interface;
the centralized unit is used for establishing a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface and acquiring multicast broadcast service data from the 5G base station through the Xn-U interface;
each distribution unit is used for generating air interface data of the tower broadcast according to the local pre-configured frequency and the service cell for broadcasting.
Optionally, the F1-M interface includes a control plane and a user plane; the concentration unit comprises a control plane part and a user plane part;
the control surface part is connected with each distribution unit through the control surface of the F1-M interface; the user plane part is connected with each distribution unit through the user plane of the F1-M interface; the control plane part is connected with the user plane part through an E1 interface.
In order to achieve the above purpose, the invention also provides the following scheme:
based on the above interoperation system of the tower broadcast and the 5G core network, the method for interoperating the tower broadcast and the 5G core network comprises:
a multicast broadcast service session is established between the 5G core network and the 5G base station through an NG interface;
transmitting the multicast broadcast service data to a 5G base station through an application server of a 5G core network;
an Xn interface for interconnection is established between the 5G tower broadcast base station and the 5G base station;
the 5G tower broadcast base station applies 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 to the 5G base station;
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 acquires multicast broadcast service data from the 5G base station through an Xn-U interface;
and the 5G tower broadcast base station generates air interface data of the tower broadcast according to the multicast broadcast service data, the local pre-configured frequency and the service cell, and broadcasts.
Optionally, before the multicast broadcast service session is established between the 5G core network and the 5G base station through the NG interface, the method for interoperating the tower broadcast with the 5G core network further includes:
and the 5G base station registers and configures with the 5G core network.
Optionally, the 5G core network includes an application server, an access and mobility management function module, a multicast broadcast service function module, a multicast broadcast session management function module, and a multicast broadcast user plane function module;
the establishing of the multicast broadcast service session between the 5G core network and the 5G base station through the NG interface specifically comprises the following steps:
the application server sends session description information to the multicast broadcast service function module; the session description information comprises service type, service quality requirement, user terminal indication, multicast and broadcast service area, start time of multicast and broadcast service session, end time of multicast and broadcast service session and multicast and broadcast service session state; the multicast broadcast service area comprises a 5G base station and a 5G tower broadcast base station;
the multicast broadcast service function module sends a multicast broadcast service session establishment request to the multicast broadcast session management function module according to the session description information, and requests the multicast broadcast session management function module to reserve an entrance resource for the multicast broadcast service session;
the multicast broadcast session management function module requests the multicast broadcast user plane function module to reserve the data plane entry resource;
the multicast broadcast user plane function module selects a data entry address and distributes a tunnel endpoint for the 5G base station forwarding 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;
and the 5G base station configures the multicast and broadcast service session according to the multicast and broadcast service session establishment message and determines the cells and the frequency in the multicast and broadcast service area according to the pre-configuration.
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 entry transport address request indication.
Optionally, the multicast broadcast service session establishment message includes: TMGI, data transfer multicast address, quality of service profile, and multicast broadcast service area.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the interoperation system of the tower broadcast and the 5G core network comprises a standard 5G base station and a 5G tower broadcast base station, a multicast broadcast service session is established between the standard 5G base station and the 5G core network through an NG interface, the standard 5G base station acquires multicast broadcast service data from the 5G core network, the 5G tower broadcast base station is connected with the standard 5G base station through an Xn-C interface and an Xn-U interface, the 5G tower broadcast base station establishes a multicast broadcast service data forwarding session with the standard 5G base station through the Xn-C interface, the multicast broadcast service data is acquired from the standard 5G base station through the Xn-U interface, and air interface data of the tower broadcast is generated according to local preconfigured frequency and service cells for broadcasting. By adopting a standard network topology structure of a 5G system, the interoperation of the tower broadcast and the 5G core network is completed based on a standard interface (Xn interface) crossing a 5G base station in an access network, the 5G core network is not influenced, and the tower broadcast single-frequency networking function is supported.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a structural diagram of a service layer convergence scheme based on a first existing interoperation method;
fig. 2 is a block diagram of a network element structure for providing multicast and broadcast services by a second existing interoperation method;
FIG. 3 is a block diagram illustrating the MBS service interoperation based on 5GC and Rel-16EnTV in the second existing interoperation method;
fig. 4 is a block diagram illustrating a structure of adding a core network element in a second existing interoperation method;
fig. 5 is a block diagram illustrating a structure of adding a core network element function to a second existing interoperation method;
fig. 6 is a structural diagram of a third existing interworking method based on an access network scheme;
fig. 7 is a structural diagram of 5GC and NG-RAN;
FIG. 8 is a block diagram of an interoperation system provided by the present invention;
FIG. 9 is a block diagram of a 5G tower broadcast base station according to the present invention;
FIG. 10 is a flow chart of the interoperation method of the present invention;
fig. 11 is a schematic diagram of a multicast broadcast service session establishment procedure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a system and a method for interoperating a tower broadcast and a 5G core network, which realize the interoperation of the tower broadcast and the 5G core network under the condition of not changing the structure of the 5G core network.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Firstly, three interoperation methods of the existing access network-based tower broadcast and 5G core network are specifically introduced:
(1) The service layer based convergence scheme typically employs the structure given in the 3GPP standard, as shown in fig. 1. The adoption of such a method for interoperation requires the addition of network element functions combining MBSF (Multicast/Broadcast service function) + BM-SC, and the support of LET (long term evolution) core network, and has a complex structure and high cost.
(2) The scheme of adding a core network element or adding an NR (new radio, new radio/new air interface) core network element function is typically the structure shown in fig. 2, fig. 3, fig. 4, and fig. 5. In the scheme of fig. 2, the broadcast and multicast functions of NRMBS (multicast-broadcast services) are completed by adding related network elements, but Rel-16EnTV cannot be supported, and the function of large tower broadcast such as single frequency network cannot be completed. In the scenario of fig. 3, the service layer is based on the scenario of fig. 2. In the core network transport layer: 1. adding MB-UPF (Multicast/broadcast user plane function) network elements, which need to support the user plane interface M1 of EnTVRAN; 2. adding a MB-SMF (Multicast/broadcast Session management Function) network element, and merging a control plane message interface M3 through a standard 5GC network element AMF (Access and mobility management Function); 3. and an AMF function is added to support a control plane interface M3 of EnTVRAN. Of the schemes of fig. 4 and 5, the service layer is based on the scheme of fig. 2. In the core network transport layer: 1. adding an XCF (XControllable broadcasting special control plane) network element or adding an XCF function in a standard SMF (Session management function) network element and an AF network element, and supporting control information of tower broadcasting; 2. an XUF (XUserbroadcasting, 5G broadcast user plane) network element or a standard UPF (user plane function) network element is added, and an XUF function is added to support the tower to broadcast user plane data. The schemes of fig. 3 and 4 are based on the premise of adding 5G core network elements or network element functions to support the tower broadcast service, and due to the changes of the overall structure of the 5G core network, the revisions of various relevant protocols and standards in the 5G core network are involved, and the support on the standards is difficult to obtain in a short time (before Rel-19).
(3) The access network based solution implements the Rel-16EnTV inter-operation by changing the network elements of the access network, typically the structure given in fig. 6. In the scenario of fig. 6, in the core network transport layer: an interface N2/N3 of a 5GC-RAN (wireless access network) of a 5GC core needs to be added with the function of a Rel-16EnTV air interface in support; the enttv RAN needs to support the functionality of the NG-RAN including the EnTV air interface. Although the scheme is a 5GS and Rel-16EnTV fusion method based on a 5GC access network, if the support of a large-scale single frequency network is completed, an N2/N3 interface needs to be upgraded, actually, network element functions of a control plane and a data plane of a core transmission layer of the 5GS also need to be modified, the time cost is higher, and the standard support is difficult to obtain in a short time like the scheme (2).
In summary, the above three schemes for interoperating 5GS and EnTV tower broadcast generally conform to the structure of the existing 5GS standard, but affect the core network of the 5GS to different degrees (the service layer scheme and the core network scheme need to add a core network element or a function of the existing core network element, the access network scheme does not need to upgrade only the Ng-eNB, and needs to upgrade the UE (user equipment), and it is clear that the standards before R19 do not obtain support.
In the 3Gpp standard, general frame diagrams of NR and NG-RAN are given, as shown in fig. 7, it can be seen that the LTE-based base station has two ways in the standard to access the core network of the 5GS, where one way is a way to directly access the core network of the 5GS through an NG interface in the figure, and is also a standard basis for the access network-based tower broadcast and 5GS interoperation scheme in fig. 5; the other approach is an approach of indirectly accessing the 5GS core network based on an Xn interface in the figure, and is the standard basis of the invention.
Example one
As shown in fig. 8, the interoperation system of the tower broadcast and the 5G core network provided in this embodiment includes: and 5G base stations gNB and 5G tower broadcast base stations 5GTB _gNB. Specifically, the 5G base station is a standard 5G base station. The 5G tower broadcast base station is the base station supporting tower broadcast.
And the 5G base station gNB is connected with the 5G core network through an NG interface. And the 5G base station gNB establishes a multicast broadcast service session with the 5G core network through an NG interface. The 5G base station gNB is used for acquiring multicast broadcast service data from the 5G core network. The 5G base station has the functions of finishing the interoperation with the 5G core network through the NG interface and finishing the service flow relay from the 5G core network to the tower broadcasting.
The 5G tower broadcasting base station 5GTB _gNBis connected with the 5G base station gNB through an Xn-C interface and an Xn-U interface. Wherein, xn-C is a control plane interface (implementing functions such as interface management and mobility management), and Xn _ U is a user plane interface (implementing functions such as data transmission, forwarding and flow control).
The 5G big tower broadcast base station 5GTB _gNBis used for establishing a multicast broadcast service data forwarding session with the 5G base station gNB through an Xn-C interface, acquiring multicast broadcast service data from the 5G base station gNB through an Xn-U interface, and generating big tower broadcast air interface data for broadcasting according to locally pre-configured frequency and service cells.
Specifically, the 5G tower broadcast base station 5gtb _gbbtakes a form based on standard CU, DU separation. Namely, the 5G tower broadcast base station 5gtb _gnbincludes 5gtb _gnb-CU (5 gtterrestrial broadcastngnbcentrailedunit, central unit) and a plurality of 5gtb _gnb-DUs (5 gtterrestrial broadcastngnbdistributedunit, distributed unit). The central unit 5GTB _gNB-CU realizes the non-real-time wireless high-level protocol stack function, and simultaneously supports the function sink of part of core networks and the deployment of 5G ground broadcast application services. The distribution unit 5gtb _gbb-DU mainly performs the physical layer function and the MAC (media access control ) layer function with a real-time requirement.
And the centralized unit is connected with the 5G base station through the Xn-C interface and the Xn-U interface. The centralized unit is connected with each distribution unit through F1-M interfaces. The F1-M interface is an upgraded version of the F1 interface for the tower broadcasting, a protocol such as single frequency network control is added, and a single frequency network mode of the tower broadcasting is supported.
The centralized unit is used for establishing a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface and acquiring multicast broadcast service data from the 5G base station through the Xn-U interface.
Each distribution unit is used for generating air interface data of the tower broadcast according to the local pre-configured frequency and the service cell for broadcasting.
Further, as shown in fig. 9, the F1-M interface includes a control plane F1-M-C and a user plane F1-M-U. The centralized unit comprises a control plane part 5GTB-gNB-CU-CP and a user plane part 5GTB-gNB-CU-UP. The control plane F1-M-C completes functions of system information management, F1 interface management and the like. The user plane F1-M-U completes user data transmission.
The control surface part 5GTB-gNB-CU-CP is connected with each distribution unit 5GTB _gNB _DUthrough the control surfaces F1-M-C of the F1-M interface. The user plane part 5GTB-gNB-CU-UP is connected with each distribution unit 5GTB _gNB _DUthrough the user plane F1-M-U 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 an E1 interface.
And the 5G large tower broadcast base station 5GTB _gNBcompletes the single frequency network function of large tower broadcast in a CU and DU separation mode.
The invention adopts a standard network topology structure of 5GS, and based on a standard interface (Xn interface) across gNB in an access network, completes 5G tower broadcasting and 5GS core network interoperation. The method has no influence on a core network of 5GS, does not need to add a special network element or custom modification and upgrade of a general network element in the core network, completely accords with the standard specification of the existing 3GPP, and supports a large tower broadcast single-frequency networking function.
Example two
The present embodiment provides an interoperation method between a tower broadcast and a 5G core network based on the interoperation system provided in the first embodiment.
The standard 5G core network includes an application server (application server), 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 a plurality of standard network elements.
As shown in fig. 10, the method for interoperating a tower broadcast and a 5G core network provided in this embodiment includes:
s1: and the 5G base station performs registration and configuration with the 5G core network. Specifically, in the inter-operation system of the embodiment, the 5G base station gNB completes registration and configuration with the 5GC (5 gcore,5G core network) according to the standard flow of 5GS, and obtains the IP address of the device accessible by the 5 GC.
S2: and a multicast broadcast service session is established between the 5G core network and the 5G base station through an NG interface.
Further, as shown in fig. 11, step S2 specifically includes:
(1) the method comprises the following steps The AF sends session description information to the MBSF module. The session description information includes service type (broadcast), qoS (quality of service) requirements, UE indication, MBS zone, start time of MBS session, end time of MBS session, and MBS session state. The MBS zone comprises a 5G base station and a 5G tower broadcast base station. The MBS session state is active or inactive. The MBSF is to authenticate the AF.
(2) And the MBSF module sends a multicast broadcast service session establishment request to the MB-SMF module according to the session description information, and requests the MB-SMF module to reserve the entrance resources for the multicast broadcast service session. The multicast broadcast service session creation request includes: a multicast broadcast service session number, a service type, a TMGI (temporary mobile group identity) allocation indication, an MBS zone and entry transport address request indication. Specifically, the MBSF module selects the MB-SMF module as a control entry of the MBS session, and sends an MBS session creation request to the MB-SMF module.
(3) The MB-SMF module requests the MB-UPF module to reserve data plane entry resources. The MB-UPF module selects a data entry address (IP address and port) and allocates a tunnel endpoint for the 5G base station gNB forwarding data. All information is returned to the AF in the original path, and all network elements obtain the information.
(4) And 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 transfer multicast address, qoS profile and MBS zone, MBSFSAID, etc. The multicast address for data transmission includes an address of the interoperation system provided in the first embodiment. The MBS zone includes the 5G base station gNB in the first embodiment.
(5) And 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 according to the MBS zone and sends an MBS session establishment message to the target base station. The target base station includes a 5G base station gNB in the first embodiment.
And the 5G base station gNB configures the MBS session according to the multicast broadcast service session establishment message, stores the TMGI, the QoS configuration file and the MBSFSAID, and determines the cell and the frequency in the MBS region according to the pre-configuration by using the MBSFSAID.
S3: and transmitting the multicast broadcast service data to the 5G base station through an application server of the 5G core network. Specifically, multicast broadcast service data starts to be transmitted from the AF, and the MB-UPF transmits the multicast broadcast service data to the 5GC and the 5G base station gNB in the first embodiment through the N3MB interface.
S4: and an Xn interface for interconnection is established between the 5G big tower broadcast base station 5GTB _gNBand the 5G base station gNB. Specifically, the 5G tower broadcast base station 5gtb _gbbapplies for an Xn interface establishment request from the 5G base station gNB through the Xn-C interface. And an Xn interface interconnection is established between the 5G base station gNB and the 5G tower broadcast base station 5GTB _gNB.
S5: the 5G big tower broadcast base station 5GTB _gNBapplies for an MBS data forwarding session request from the 5G base station gNB to the 5G big tower broadcast base station 5GTB _gNBbased on the Xn interface from the 5G base station gNB.
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 tower broadcast base station 5gtb \gnb.
S7: and the 5G large tower broadcast base station 5GTB _gNBacquires multicast broadcast service data from the 5G base station gNB through an Xn-U interface.
S8: and the 5G big tower broadcast base station 5GTB _gNBgenerates air interface data of the big tower broadcast according to the multicast broadcast service data, the locally preset frequency and the service cell, and broadcasts. Finally, the UE receives a tower broadcast signal broadcasted by a 5G tower broadcast base station 5gtb _gbb.
The invention can support the interoperation of the big tower broadcast and the 5GS core network on the premise of adopting a standard interface without any influence on the 5G core network, increasing the service network element or upgrading the network element function, realizes the coverage of the big tower broadcast, provides service services such as large-range low-cost live broadcast television programs, large-range data push, public data push and the like, provides a single-frequency networking function and improves the frequency utilization efficiency.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A system for interoperation between a tower broadcast and a 5G core network, the system comprising: 5G base stations and 5G tower broadcast base stations;
the 5G base station is connected with a 5G core network through an NG interface; the 5G base station establishes a multicast broadcast service session with the 5G core network through an NG interface; the 5G base station is used for acquiring multicast broadcast service data from the 5G core network;
the 5G tower broadcast base station is connected with the 5G base station through an Xn-C interface and an Xn-U interface;
the 5G tower broadcast base station is used for establishing a multicast broadcast service data forwarding session with the 5G base station through an Xn-C interface, acquiring multicast broadcast service data from the 5G base station through an Xn-U interface, and generating air interface data of tower broadcast according to a local pre-configured frequency and a service cell for broadcasting.
2. The system of claim 1, wherein the 5G tower broadcast base station comprises a centralized unit and a plurality of distributed units;
the centralized unit is connected with the 5G base station through the Xn-C interface and the Xn-U interface; the centralized unit is connected with each distribution unit through an F1-M interface; the F1-M interface is an interface supporting a single frequency network mode of tower broadcasting on the basis of the F1 interface;
the centralized unit is used for establishing a multicast broadcast service data forwarding session with the 5G base station through the Xn-C interface and acquiring multicast broadcast service data from the 5G base station through the Xn-U interface;
each distribution unit is used for generating air interface data of the tower broadcast according to the local pre-configured frequency and the service cell for broadcasting.
3. The tower broadcast and 5G core network interoperation system of claim 2, wherein the F1-M interface comprises a control plane and a user plane; the concentration unit comprises a control plane part and a user plane part;
the control surface part is connected with each distribution unit through the control surface of the F1-M interface; the user plane part is connected with each distribution unit through the user plane of the F1-M interface; the control plane part is connected with the user plane part through an E1 interface.
4. A method for interoperating tower broadcast with a 5G core network, based on the system for interoperating tower broadcast with a 5G core network of any one of claims 1 to 3, wherein the method for interoperating tower broadcast with a 5G core network comprises:
a multicast broadcast service session is established between the 5G core network and the 5G base station through an NG interface;
transmitting the multicast broadcast service data to a 5G base station through an application server of a 5G core network;
establishing an Xn interface for interconnection between the 5G tower broadcast base station and the 5G base station;
the 5G tower broadcast base station applies for a multicast broadcast service data forwarding session request between the 5G base station and the 5G tower broadcast base station based on an Xn interface to the 5G base station;
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 acquires multicast broadcast service data from the 5G base station through an Xn-U interface;
and the 5G tower broadcast base station generates air interface data of the tower broadcast according to the multicast broadcast service data, the local pre-configured frequency and the service cell, and broadcasts.
5. The method of claim 4, wherein before the multicast broadcast service session is established between the 5G core network and the 5G base station through the NG interface, the method further comprises:
and the 5G base station performs registration and configuration with the 5G core network.
6. The method of claim 4, wherein the 5G core network comprises an application server, an access and mobility management function, a multicast broadcast service function, a multicast broadcast session management function, and a multicast broadcast user plane function;
the establishing of the multicast broadcast service session between the 5G core network and the 5G base station through the NG interface specifically comprises the following steps:
the application server sends session description information to the multicast broadcast service function module; the session description information comprises a service type, a service quality requirement, a user terminal indication, a multicast and broadcast service area, the start time of a multicast and broadcast service session, the end time of the multicast and broadcast service session and a multicast and broadcast service session state; the multicast broadcast service area comprises a 5G base station and a 5G tower broadcast base station;
the multicast broadcast service function module sends a multicast broadcast service session establishment request to the multicast broadcast session management function module according to the session description information, and requests the multicast broadcast session management function module to reserve an entrance resource for the multicast broadcast service session;
the multicast broadcast session management function module requests the multicast broadcast user plane function module to reserve the data plane entry resource;
the multicast broadcast user plane function module selects a data entry address and distributes a tunnel endpoint for the 5G base station forwarding 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;
and the 5G base station configures the multicast and broadcast service session according to the multicast and broadcast service session establishment message and determines the cells and the frequency in the multicast and broadcast service area according to the pre-configuration.
7. The method of claim 6, wherein the multicast broadcast service session creation request comprises: a multicast broadcast service session number, a service type, a Temporary Mobile Group Identity (TMGI) assignment indication, a multicast broadcast service area and an entry transport address request indication.
8. The method of claim 6, wherein the multicast broadcast service session establishment message comprises: TMGI, data transfer multicast address, quality of service profile, and multicast broadcast service area.
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