A network optimization system and method for 5G broadband and narrowband integrated private network

Abstract

The present invention relates to a network optimization method for a 5G broadband and narrowband converged private network, comprising the following steps: S1: When a calling terminal needs to page a called terminal, a trial call is first initiated, and an NSTF network element receives the trial call request; S2: The NSTF network element obtains the terminal's network selection information by calling and accessing the network management, user database and other network elements of a narrowband cluster core network and a broadband cluster core network, and then sends the above network selection information to the calling terminal; S3: The calling terminal selects a bearer network for the call according to the above network selection information received; S4: Determine the service scope during the call. A new NSTF network element is added on the network side, and the network selection information of the broadband and narrowband dual-mode terminal is obtained by calling and accessing the network management of the broadband cluster core network and the narrowband cluster core network. When the broadband and narrowband dual-mode terminal initiates a trial call, the NSTF network element feeds back the network selection information to the broadband and narrowband dual-mode terminal, which can avoid forwarding the service via the converged gateway and reduce the converged gateway load.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technologies, and more specifically, to a network optimization system and method for a 5G broadband and narrowband converged private network. Background Art

[0002] Existing broadband and narrowband dual-mode terminals adopt a default network selection method, that is, when the calling terminal sends a call signal, if the called terminal is in an area covered by both broadband and narrowband networks, the terminal chooses to carry voice services via the narrowband network and carry data services via the broadband network; if the called terminal is in an area covered only by the broadband network, the terminal chooses to carry both voice and data services via the broadband network; if the called terminal is in an area covered only by the narrowband network, the terminal chooses to carry voice services and low-speed data services via the narrowband network, but does not support high-speed data services.

[0003] In the existing technology, Chinese invention patent CN111970649B discloses "an application of a fusion mobile terminal suitable for front-line police officers", which was announced on May 25, 2021. The terminal detects the availability of narrowband private network and operator 4G or 5G broadband network wireless signals, and controls the working mode switching according to the signal status. When it is detected that both narrowband and broadband network wireless signals are available, the built-in narrowband communication module of the fusion mobile terminal is responsible for the voice intercom service, and the built-in broadband communication module of the fusion mobile terminal is responsible for the data service; when it is detected that the narrowband private network wireless signal is unavailable, the broadband communication module is responsible for the voice intercom and data service functions; when it is detected that the broadband private network wireless signal is unavailable, the narrowband communication module can only provide voice intercom services, and data services are unavailable. This method is consistent with the aforementioned default network selection method. Summary of the invention

[0004] The present invention aims to solve the problems that the prior art adopts a default network selection method, which only selects a network according to the presence or absence of broadband and narrowband network coverage, fails to select the optimal bearer network for service forwarding according to the actual broadband and narrowband network coverage quality, resulting in poor user experience; and at the same time, since the service is not constrained to be forwarded within the network as much as possible, it is easy to cause a large load pressure on the converged gateway. The present invention provides a network optimization system and method for a 5G broadband and narrowband converged private network.

[0005] In order to achieve the above invention purpose, the technical solution adopted is:

[0006] A network optimization system for a 5G broadband and narrowband converged private network, including a broadband and narrowband dual-mode terminal, a broadband base station, a narrowband base station, a broadband cluster core network, a narrowband cluster core network, a converged gateway, and an NSTF network element;

[0007] The output end of the wide-narrowband dual-mode terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station, the output end of the broadband base station is electrically connected to the input end of the broadband cluster core network, the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network, the output end of the broadband cluster core network and the output end of the narrowband cluster core network are both electrically connected to the input end of the converged gateway; the broadband cluster core network and the narrowband cluster core network are both electrically connected to the converged gateway in both directions.

[0008] In the above scheme, a new NSTF network element is added on the network side, which obtains the network selection information of the broadband and narrowband dual-mode terminals by calling and accessing the network management, user database and other network elements of the broadband cluster core network and the narrowband cluster core network. When the broadband and narrowband dual-mode terminal initiates a trial call, the NSTF network element feeds back the network selection information to the broadband and narrowband dual-mode terminal, which can avoid forwarding services through the converged gateway to the greatest extent and reduce the load on the converged gateway.

[0009] Preferably, the broadband and narrowband dual-mode terminal includes a calling terminal and several called terminals, the output end of a calling terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station; the output ends of several called terminals are wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station.

[0010] Preferably, the calling terminal or any called terminal includes a broadband communication module and a narrowband intercom module, the output end of the broadband communication module is wirelessly connected to the input end of the broadband base station, and the output end of the narrowband intercom module is wirelessly connected to the input end of the narrowband base station.

[0011] Preferably, the output end of the broadband communication module and the input end of the broadband base station transmit broadband signals through an air interface; the output end of the narrowband intercom module and the input end of the narrowband base station transmit narrowband signals through an air interface.

[0012] Preferably, the output end of the broadband base station is electrically connected to the input end of the broadband cluster core network through a transmission network, and the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network through a transmission network.

[0013] Preferably, the broadband cluster core network and the narrowband cluster core network are both bidirectionally electrically connected to the converged gateway via a standardized interface.

[0014] In the above scheme, the integration of broadband and narrowband networks is the mainstream trend of the development of cluster communication systems. The typical implementation method of existing broadband and narrowband integration is to introduce a fusion gateway between broadband and narrowband systems to achieve interconnection between broadband and narrowband networks. That is, the broadband and narrowband fusion private network system connected through the fusion gateway includes six major modules: broadband and narrowband dual-mode terminals, broadband base stations, broadband core networks, narrowband base stations, narrowband core networks and fusion gateways. Among them, the main function of the fusion gateway is to perform protocol conversion and scheduling on the calling signal through the built-in standard protocol processing module and dispatch it to the called terminal or called terminal group. Since the communication services between broadband and narrowband systems need to be forwarded through the fusion gateway, the processing capacity of the fusion gateway determines the upper limit of the communication capacity of the broadband and narrowband fusion private network system. If the communication capacity demand of the existing network exceeds the processing capacity of a single fusion gateway, multiple groups of fusion gateways must be added to divert services, resulting in a surge in deployment cost investment. Under the premise of ensuring the quality of network services, the present invention minimizes the number of times the service is forwarded through the fusion gateway, effectively reduces the load requirements on the fusion gateway, and thus reduces the system deployment cost to a certain extent.

[0015] The present invention adds a NSTF network element on the network side, and obtains the terminal network selection information, including the terminal location information, network coverage, network quality information, terminal slice contract information, etc., by calling and accessing the network management, user database and other network elements of the wide- and narrow-band cluster network. When the calling terminal initiates a trial call, the NSTF network element feeds back the above information to the calling terminal, and the calling terminal selects the network accordingly, which can avoid forwarding the service through the converged gateway to the greatest extent and reduce the load of the converged gateway.

[0016] A network optimization method for a 5G broadband and narrowband integrated private network, applied to a network optimization system for a 5G broadband and narrowband integrated private network, comprises the following steps:

[0017] S1: When the calling terminal needs to page the called terminal, it first initiates a trial call, and the NSTF network element receives the trial call request;

[0018] S2: The NSTF network element obtains the network selection information of the terminal by calling and accessing the network management, user database and other network elements of the narrowband cluster core network and the broadband cluster core network, and then sends the network selection information to the calling terminal;

[0019] S3: The calling terminal selects a bearer network for the call according to the received network selection information;

[0020] S4: Determine the business scope during the call.

[0021] Preferably, in step S2, the network selection information of the terminal includes the longitude and latitude of the location, service cell information, broadband / narrowband network coverage, RSRP, SINR, user ID, 5G slice subscription information, group information, and the proportion of users on the network.

[0022] Preferably, in step S3, the network coverage environment in which the calling terminal may be located is recorded as a∈A={a1,a2,a3},

[0023]

[0024] The network coverage environment where the called terminal may be located is denoted as b∈B={b1,b2,b3,b4},

[0025]

[0026] The network selection behavior of the calling terminal is recorded as c∈C={c1,c2},

[0027]

[0028] Determine the k value based on the response information obtained from the call attempt:

[0029] When the calling terminal is only in broadband, broadband paging is selected; when the calling terminal is only in narrowband coverage, narrowband paging is selected, that is, when i∈{1,2}, let k=i;

[0030] When the calling terminal is in both broadband and narrowband coverage, that is, i=3,

[0031] (1) If the called terminal is only in broadband coverage, broadband paging is selected; if the called terminal is only in narrowband coverage, narrowband paging is selected, that is, when j∈{1,2}, let k=j;

[0032] (2) If the called terminal is in both broadband and narrowband coverage, if the broadband network quality is good or the terminal has signed a 5G slice, broadband paging is selected; otherwise, narrowband paging is selected;

[0033] The network quality of the called terminal is recorded as Q, and its value is determined as follows:

[0034] Q=AND((RSRP≥α),(SINR≥β))

[0035] Among them, α and β are the set RSRP and SINR thresholds respectively. When RSRP and SINR are higher than the threshold values, the network quality is judged to be good, that is, when the network quality is good, Q=1, and when the network quality is poor, Q=0;

[0036] The 5G slice subscription status of the called terminal is recorded as S, and its value is:

[0037]

[0038] In summary, when j = 3, let

[0039]

[0040] (3) If the called terminal is partially covered by the broadband network and partially covered by the narrowband network, the number of terminals in the broadband network is recorded as M1, and the number of terminals in the narrowband network is recorded as M2. The two numbers are compared. If the number of terminals in the broadband network is large, broadband paging is selected; otherwise, narrowband paging is selected. That is, when j=4, let

[0041]

[0042] Finally, execute the network selection paging behavior c k .

[0043] Preferably, in step S4, in a call, the following three conditions must be met at the same time to support voice intercom, low-speed data service and high-speed data service at the same time, otherwise only voice intercom and low-speed data service are supported:

[0044] Ⅰ. The calling terminal selects broadband paging;

[0045] Ⅱ. All called terminals are within broadband coverage;

[0046] III. The broadband network quality is good or the terminal has signed a 5G slice;

[0047] Let voice intercom and low-speed data services be t1, high-speed data services be t2, and all services supported by a single call be set T, we have:

[0048]

[0049] In the above scheme, due to the limited forwarding capacity of the fusion gateway, a large number of services need to be forwarded through the fusion gateway when they are exchanged between the broadband / narrowband cluster core network, which can easily lead to excessive gateway load and thus network interruption. Using the terminal network selection method provided by the present invention, when the fusion terminal is in an environment where both the broadband network and the narrowband network are covered, combined with the terminal information, network information, user information, etc. issued by the NSTF network element, the calling terminal can determine the bearer network when initiating the service, and constrain the service to be transmitted in the same network as much as possible, so as to avoid the calling terminal and the called terminal in the same network coverage environment still forwarding the service through the fusion gateway, thereby reducing the pressure on the fusion gateway and the risk of network paralysis.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The present invention provides a network optimization system and method for a 5G broadband and narrowband converged private network. A new NSTF network element is added on the network side. The network selection information of the broadband and narrowband dual-mode terminals is obtained by calling and accessing the network management, user database and other network elements of the broadband cluster core network and the narrowband cluster core network. When the broadband and narrowband dual-mode terminal initiates a trial call, the NSTF network element feeds back the network selection information to the broadband and narrowband dual-mode terminal, which can avoid forwarding services via the converged gateway to the greatest extent and reduce the load on the converged gateway. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the system of the present invention;

[0053] Figure 2 is a flow chart of the method of the present invention;

[0054] Figure 3 This is a flow chart of terminal network selection of the present invention;

[0055] Figure 4 It is a business process diagram of the present invention. DETAILED DESCRIPTION

[0056] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0057] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0058] Example 1

[0059] like Figure 1 As shown, a network optimization system for a 5G broadband and narrowband integrated private network includes a broadband and narrowband dual-mode terminal, a broadband base station, a narrowband base station, a broadband cluster core network, a narrowband cluster core network, a converged gateway and an NSTF network element;

[0060] The output end of the wide-narrowband dual-mode terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station, the output end of the broadband base station is electrically connected to the input end of the broadband cluster core network, the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network, the output end of the broadband cluster core network and the output end of the narrowband cluster core network are both electrically connected to the input end of the converged gateway; the broadband cluster core network and the narrowband cluster core network are both electrically connected to the converged gateway in both directions.

[0061] In the above scheme, a new NSTF network element is added on the network side, which obtains the network selection information of the broadband and narrowband dual-mode terminals by calling and accessing the network management, user database and other network elements of the broadband cluster core network and the narrowband cluster core network. When the broadband and narrowband dual-mode terminal initiates a trial call, the NSTF network element feeds back the network selection information to the broadband and narrowband dual-mode terminal, which can avoid forwarding services through the converged gateway to the greatest extent and reduce the load on the converged gateway.

[0062] Preferably, the broadband and narrowband dual-mode terminal includes a calling terminal and several called terminals, the output end of a calling terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station; the output ends of several called terminals are wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station.

[0063] Preferably, the calling terminal or any called terminal includes a broadband communication module and a narrowband intercom module, the output end of the broadband communication module is wirelessly connected to the input end of the broadband base station, and the output end of the narrowband intercom module is wirelessly connected to the input end of the narrowband base station.

[0064] Preferably, the output end of the broadband communication module and the input end of the broadband base station transmit broadband signals through an air interface; the output end of the narrowband intercom module and the input end of the narrowband base station transmit narrowband signals through an air interface.

[0065] Preferably, the output end of the broadband base station is electrically connected to the input end of the broadband cluster core network through a transmission network, and the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network through a transmission network.

[0066] Preferably, the broadband cluster core network and the narrowband cluster core network are both bidirectionally electrically connected to the converged gateway via a standardized interface.

[0067] Broadband and narrowband dual-mode terminal: Integrates broadband communication module and narrowband intercom module, connects to broadband base station and narrowband base station through air interface, and can work in broadband and narrowband networks;

[0068] Broadband base station: transmits broadband signals with the broadband communication module through the air interface and connects with the broadband cluster core network through the transmission network;

[0069] Broadband cluster core network: connected to broadband base stations through the transmission network, providing broadband user connections, user management, and service carrying;

[0070] Narrowband base station: transmits narrowband signals with the narrowband intercom module through the air interface and connects with the narrowband cluster core network through the transmission network;

[0071] Narrowband cluster core network: connected to narrowband base stations through the transmission network, providing narrowband user connections, user management, and service carrying;

[0072] Converged gateway: used to connect to the broadband / narrowband cluster core network for protocol conversion, scheduling and dispatching;

[0073] NSTF network element: It connects to the broadband cluster core network and the narrowband cluster core network respectively through standardized interfaces, and can send response information to the broadband and narrowband dual-mode terminals.

[0074] In the above scheme, the integration of broadband and narrowband networks is the mainstream trend of the development of cluster communication systems. The typical implementation method of existing broadband and narrowband integration is to introduce a fusion gateway between broadband and narrowband systems to achieve interconnection between broadband and narrowband networks. That is, the broadband and narrowband fusion private network system connected through the fusion gateway includes six major modules: broadband and narrowband dual-mode terminals, broadband base stations, broadband core networks, narrowband base stations, narrowband core networks and fusion gateways. Among them, the main function of the fusion gateway is to perform protocol conversion and scheduling on the calling signal through the built-in standard protocol processing module and dispatch it to the called terminal or called terminal group. Since the communication services between broadband and narrowband systems need to be forwarded through the fusion gateway, the processing capacity of the fusion gateway determines the upper limit of the communication capacity of the broadband and narrowband fusion private network system. If the communication capacity demand of the existing network exceeds the processing capacity of a single fusion gateway, multiple groups of fusion gateways must be added to divert services, resulting in a surge in deployment cost investment. Under the premise of ensuring the quality of network services, the present invention minimizes the number of times the service is forwarded through the fusion gateway, effectively reduces the load requirements on the fusion gateway, and thus reduces the system deployment cost to a certain extent.

[0075] The present invention adds a NSTF network element on the network side, and obtains the terminal network selection information, including the terminal location information, network coverage, network quality information, terminal slice contract information, etc., by calling and accessing the network management, user database and other network elements of the wide- and narrow-band cluster network. When the calling terminal initiates a trial call, the NSTF network element feeds back the above information to the calling terminal, and the calling terminal selects the network accordingly, which can avoid forwarding the service through the converged gateway to the greatest extent and reduce the load of the converged gateway.

[0076] Example 2

[0077] like Figure 2 and Figure 3 As shown, a network optimization method for a 5G broadband and narrowband integrated private network is applied to a network optimization system for a 5G broadband and narrowband integrated private network, including the following steps:

[0078] S1: When the calling terminal needs to page the called terminal, it first initiates a trial call, and the NSTF network element receives the trial call request;

[0079] S2: The NSTF network element obtains the network selection information of the terminal by calling and accessing the network management, user database and other network elements of the narrowband cluster core network and the broadband cluster core network, and then sends the network selection information to the calling terminal;

[0080] S3: The calling terminal selects a bearer network for the call according to the received network selection information;

[0081] S4: Determine the business scope during the call.

[0082] Preferably, in step S2, the network selection information of the terminal includes the longitude and latitude of the location, service cell information, broadband / narrowband network coverage, RSRP, SINR, user ID, 5G slice subscription information, group information, and the proportion of users on the network.

[0083] Preferably, in step S3, the network coverage environment in which the calling terminal may be located is recorded as a∈A={a1,a2,a3},

[0084]

[0085] The network coverage environment where the called terminal may be located is denoted as b∈B={b1,b2,b3,b4},

[0086]

[0087] The network selection behavior of the calling terminal is recorded as c∈C={c1,c2},

[0088]

[0089] Determine the k value based on the response information obtained from the call attempt:

[0090] When the calling terminal is only in broadband, broadband paging is selected; when the calling terminal is only in narrowband coverage, narrowband paging is selected, that is, when i∈{1,2}, let k=i;

[0091] When the calling terminal is in both broadband and narrowband coverage, that is, i=3,

[0092] (1) If the called terminal is only in broadband coverage, broadband paging is selected; if the called terminal is only in narrowband coverage, narrowband paging is selected, that is, when j∈{1,2}, let k=j;

[0093] (2) If the called terminal is in both broadband and narrowband coverage, if the broadband network quality is good or the terminal has signed a 5G slice, broadband paging is selected; otherwise, narrowband paging is selected;

[0094] The network quality of the called terminal is recorded as Q, and its value is determined as follows:

[0095] Q=AND((RSRP≥α),(SINR≥β))

[0096] Among them, α and β are the set RSRP and SINR thresholds respectively. When RSRP and SINR are higher than the threshold values, the network quality is judged to be good, that is, when the network quality is good, Q=1, and when the network quality is poor, Q=0;

[0097] The 5G slice subscription status of the called terminal is recorded as S, and its value is:

[0098]

[0099] In summary, when j = 3, let

[0100]

[0101] (3) If the called terminal is partially covered by the broadband network and partially covered by the narrowband network, the number of terminals in the broadband network is recorded as M1, and the number of terminals in the narrowband network is recorded as M2. The two numbers are compared. If the number of terminals in the broadband network is large, broadband paging is selected; otherwise, narrowband paging is selected. That is, when j=4, let

[0102]

[0103] Finally, execute the network selection paging behavior c k .

[0104] Preferably, in step S4, in a call, the following three conditions must be met at the same time to support voice intercom, low-speed data service and high-speed data service at the same time, otherwise only voice intercom and low-speed data service are supported:

[0105] Ⅰ. The calling terminal selects broadband paging;

[0106] Ⅱ. All called terminals are within broadband coverage;

[0107] III. The broadband network quality is good or the terminal has signed a 5G slice;

[0108] Let voice intercom and low-speed data services be t1, high-speed data services be t2, and all services supported by a single call be set T, we have:

[0109]

[0110] In the above scheme, due to the limited forwarding capacity of the fusion gateway, a large number of services need to be forwarded through the fusion gateway when they are exchanged between the broadband / narrowband cluster core network, which can easily lead to excessive gateway load and thus network interruption. Using the terminal network selection method provided by the present invention, when the fusion terminal is in an environment where both the broadband network and the narrowband network are covered, combined with the terminal information, network information, user information, etc. issued by the NSTF network element, the calling terminal can determine the bearer network when initiating the service, and constrain the service to be transmitted in the same network as much as possible, so as to avoid the calling terminal and the called terminal in the same network coverage environment still forwarding the service through the fusion gateway, thereby reducing the pressure on the fusion gateway and the risk of network paralysis.

[0111] Example 3

[0112] like Figure 4 As shown, this figure is a schematic diagram of the network optimization service process of the 5G broadband and narrowband integrated private network in an embodiment of the present invention. When the calling terminal and the called terminal group are both in the broadband and narrowband network coverage environment, the service process initiated by the calling terminal is:

[0113] Step 1: Caller attempts to call

[0114] The calling broadband and narrowband dual-mode terminal initiates a test call request. After receiving the request, the NSTF network element initiates query requests to the broadband and narrowband cluster core networks respectively; the broadband and narrowband cluster core networks respond to the NSTF query request; the NSTF sends the query information to the calling terminal, including the longitude and latitude of the location, broadband / narrowband network coverage, network quality (RSRP, SINR), 5G slice subscription information, group information, proportion of users on the network, etc., as shown in Table 1.

[0115] Table 1 Call test response information

[0116]

[0117] Step 2: Network selection

[0118] The calling terminal is in the coverage of both the wideband and narrowband networks. According to the definition of formula 1, a=a3, that is, i=3.

[0119] The called terminal is in the coverage of both the wideband and narrowband networks. According to the definition of formula 2, b=b3, that is, j=3.

[0120] According to the information obtained, RSRP is -90dBm, SINR is 3dB, α is set to -110dBm, β is set to -3dB, and according to the formula Q=AND((RSRP≥α),(SINR≥β)), it can be calculated that Q=AND((RSRP≥α),(SINR≥β))=1.

[0121] According to the information obtained, the terminal signed 5G slice Slice#01, according to the formula So S=1. According to the formula Calculation shows that OR(Q,S)=1, and from the above we can get k=1.

[0122] Execute network selection behavior c1, that is, select a broadband network for paging.

[0123] Step 3: Determine business scope

[0124] according to

[0125] Calculation can get AND((k=1), OR(Q,S))=1, so T={t1,t2}, that is, this paging supports voice intercom, low-speed data service and high-speed data service at the same time.

[0126] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A network optimization system for a 5G broadband and narrowband integrated private network, characterized in that: Including broadband and narrowband dual-mode terminals, broadband base stations, narrowband base stations, broadband cluster core network, narrowband cluster core network, converged gateways and NSTF network elements; The output end of the broadband and narrowband dual-mode terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station, the output end of the broadband base station is electrically connected to the input end of the broadband cluster core network, the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network, the output end of the broadband cluster core network and the output end of the narrowband cluster core network are both electrically connected to the input end of the converged gateway; the broadband cluster core network and the narrowband cluster core network are both bidirectionally electrically connected to the converged gateway; When the network optimization system is used to implement network optimization, the following steps are performed: S1: When the calling terminal needs to page the called terminal, it first initiates a trial call, and the NSTF network element receives the trial call request; S2: The NSTF network element obtains the network selection information of the terminal by calling and accessing the network management and user database network elements of the narrowband cluster core network and the broadband cluster core network, and then sends the network selection information to the calling terminal; The network selection information of the terminal includes the latitude and longitude of the location, service cell information, broadband / narrowband network coverage, RSRP, SINR, user ID, 5G slice subscription information, group information, and proportion of users on the network; S3: The calling terminal selects a bearer network for the call according to the received network selection information. The network coverage environment where the calling terminal may be located is denoted as a∈{a1,a2,a3}. ； The network coverage environment where the called terminal may be located is denoted as b∈{b1,b2,b3,b4}, ； The network selection behavior of the calling terminal is recorded as c∈{c1,c2}, ； Determine the k value based on the response information obtained from the call attempt: When the calling terminal is only in broadband, broadband paging is selected; when the calling terminal is only in narrowband coverage, narrowband paging is selected, that is, when i∈{1,2}, let k=i; When the calling terminal is in both broadband and narrowband coverage, that is, i=3, (1) If the called terminal is only in broadband coverage, broadband paging is selected; if the called terminal is only in narrowband coverage, narrowband paging is selected, that is, when j∈{1,2}, let k=j; (2) If the called terminal is in both broadband and narrowband coverage, if the broadband network quality is good or the terminal has signed a 5G slice, broadband paging is selected; otherwise, narrowband paging is selected; The network quality of the called terminal is recorded as Q, and its value is determined as follows: Q=AND((RSRP≥α),(SINR≥β)) Among them, α and β are the set RSRP and SINR thresholds respectively. When RSRP and SINR are higher than the threshold values, the network quality is judged to be good, that is, when the network quality is good, Q=1, and when the network quality is poor, Q=0; The 5G slice subscription status of the called terminal is recorded as S, and its value is: ； In summary, when j=3, let ； (3) If the called terminal is partially covered by the broadband network and partially covered by the narrowband network, the number of terminals in the broadband network is recorded as M1, and the number of terminals in the narrowband network is recorded as M2. The two numbers are compared. If the number of terminals in the broadband network is large, broadband paging is selected; otherwise, narrowband paging is selected. That is, when j=4, let ； Finally, execute the network selection paging behavior c k ; S4: Determine the business scope during the call.

2. According to claim 1, a network optimization system for a 5G broadband and narrowband integrated private network is characterized in that: The broadband and narrowband dual-mode terminal includes a calling terminal and several called terminals, the output end of a calling terminal is wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station; the output ends of several called terminals are wirelessly connected to the input end of the broadband base station and the input end of the narrowband base station.

3. A network optimization system for a 5G broadband and narrowband integrated private network according to claim 2, characterized in that: The calling terminal or any called terminal includes a broadband communication module and a narrowband intercom module, the output end of the broadband communication module is wirelessly connected to the input end of the broadband base station, and the output end of the narrowband intercom module is wirelessly connected to the input end of the narrowband base station.

4. A network optimization system for a 5G broadband and narrowband integrated private network according to claim 3, characterized in that: The output end of the broadband communication module and the input end of the broadband base station transmit broadband signals through an air interface; the output end of the narrowband intercom module and the input end of the narrowband base station transmit narrowband signals through an air interface.

5. A network optimization system for a 5G broadband and narrowband integrated private network according to claim 4, characterized in that: The output end of the broadband base station is electrically connected to the input end of the broadband cluster core network through a transmission network, and the output end of the narrowband base station is electrically connected to the input end of the narrowband cluster core network through a transmission network.

6. A network optimization system for a 5G broadband and narrowband integrated private network according to claim 5, characterized in that: The broadband cluster core network and the narrowband cluster core network are both bidirectionally electrically connected to the fusion gateway via a standardized interface.

7. A network optimization method for a 5G broadband and narrowband integrated private network, applied to a network optimization system for a 5G broadband and narrowband integrated private network as described in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: When the calling terminal needs to page the called terminal, it first initiates a trial call, and the NSTF network element receives the trial call request; S2: The NSTF network element obtains the network selection information of the terminal by calling and accessing the network management, user database and other network elements of the narrowband cluster core network and the broadband cluster core network, and then sends the network selection information to the calling terminal; S3: The calling terminal selects a bearer network for the call according to the received network selection information; S4: Determine the business scope during the call.

8. A network optimization method for a 5G broadband and narrowband converged private network according to claim 7, characterized in that: In step S2, the network selection information of the terminal includes the latitude and longitude of the location, service cell information, broadband / narrowband network coverage, RSRP, SINR, user ID, 5G slice subscription information, group information, and the proportion of users on the network.

9. A network optimization method for a 5G broadband and narrowband integrated private network according to claim 8, characterized in that: In step S3, the network coverage environment that the calling terminal may be in is recorded as a∈{a1,a2,a3}, ； The network coverage environment where the called terminal may be located is denoted as b∈{b1,b2,b3,b4}, ； The network selection behavior of the calling terminal is recorded as c∈{c1,c2}, ； Determine the k value based on the response information obtained from the call attempt: When the calling terminal is only in broadband, select broadband paging; When the calling terminal is only in narrowband coverage, narrowband paging is selected, that is, when i∈{1,2}, let k=i; When the calling terminal is in both broadband and narrowband coverage, that is, i=3, (1) If the called terminal is only in broadband coverage, broadband paging is selected; if the called terminal is only in narrowband coverage, narrowband paging is selected, that is, when j∈{1,2}, let k=j; (2) If the called terminal is in both broadband and narrowband coverage, if the broadband network quality is good or the terminal has signed a 5G slice, broadband paging is selected; otherwise, narrowband paging is selected; The network quality of the called terminal is recorded as Q, and its value is determined as follows: Q=AND((RSRP≥α),(SINR≥β)) Among them, α and β are the set RSRP and SINR thresholds respectively. When RSRP and SINR are higher than the threshold values, the network quality is judged to be good, that is, when the network quality is good, Q=1, and when the network quality is poor, Q=0; The 5G slice subscription status of the called terminal is recorded as S, and its value is: ； In summary, when j=3, let ； (3) If the called terminal is partially covered by the broadband network and partially covered by the narrowband network, the number of terminals in the broadband network is recorded as M1, and the number of terminals in the narrowband network is recorded as M2. The two numbers are compared. If the number of terminals in the broadband network is large, broadband paging is selected; otherwise, narrowband paging is selected. That is, when j=4, let ； Finally, execute the network selection paging behavior c k .

10. A network optimization method for a 5G broadband and narrowband integrated private network according to claim 9, characterized in that: In step S4, in a call, the following three conditions must be met at the same time to support voice intercom, low-speed data service and high-speed data service at the same time, otherwise only voice intercom and low-speed data service are supported: Ⅰ. The calling terminal selects broadband paging; Ⅱ. All called terminals are within broadband coverage; III. The broadband network quality is good or the terminal has signed a 5G slice; Let voice intercom and low-speed data services be t1, high-speed data services be t2, and all services supported by a single call be set T, we have: 。

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