Small base station data communication method, small base station data communication system

Abstract

This application provides a data communication method for a small base station and a small base station data communication system. Among them, the data communication method of the small base station includes: the radio frequency unit receives the first data sent by the user terminal; the radio frequency unit sends the first data to the protocol stack processing unit; the protocol stack processing unit sends the first data to the lightweight core network deployed in the small base station; the lightweight core network sends the first data to the network device for interaction and receives the second data for the first data; the lightweight core network sends the second data to the protocol stack processing unit; the protocol stack processing unit sends the second data to the radio frequency unit; the radio frequency unit returns the second data to the user terminal. By integrating the small base station with the lightweight core network, this application not only reduces the cost of the component network but also improves the convenience of network operation and maintenance in the later stage.

Description

Technical Field

[0001] This application relates to the technical field of 5G communication, and in particular to a data communication method for small base stations and a small base station data communication system. Background Art

[0002] As a small, indoor-installable, and flexible-configured base station, a 5G small base station uses a fixed broadband network as the backhaul to access the operator's core network, which can well solve the problem of weak indoor coverage of 5G network signals and provide high-quality signal coverage in a small area. It is mainly used to solve the problems of network capacity and 5G signal coverage in a small area, such as factories, mines, hotspots, and important places.

[0003] During the process of building and using small base stations, people found that: the existing 5G small base station networking is relatively difficult; one way is to access the operator's core network through the public Internet network, which requires redeployment of a security gateway and an access gateway; this method requires the operator's participation and access permission to provide normal services; another way is for large factories and mines to purchase core network equipment by themselves and build their own 5G private network, but this method is often costly and the subsequent operation and maintenance are complex.

[0004] Therefore, this application provides a data communication method for small base stations and a small base station data communication system with low construction cost, convenient operation and maintenance. By integrating 5G small base stations with a lightweight 5G core network, 5G signal coverage and 5G-based data transmission services can be provided as soon as the 5G small base station equipment is powered on, so as to solve the existing problem of difficult networking of 5G small base stations. Summary of the Invention

[0005] The embodiments of this application provide a technical solution for a data communication method for small base stations and a small base station data communication system with low construction cost, convenient operation and maintenance.

[0006] Specifically, a data communication method for small base stations includes:

[0007] The radio frequency unit receives the first data sent by the user terminal;

[0008] The radio frequency unit sends the first data to the protocol stack processing unit;

[0009] The protocol stack processing unit sends the first data to the lightweight core network deployed in the small base station;

[0010] The lightweight core network sends the first data to the network device for interaction and receives the second data for the first data;

[0011] The lightweight core network sends the second data to the protocol stack processing unit;

[0012] The protocol stack processing unit sends the second data to the radio frequency unit;

[0013] The radio frequency unit returns the second data to the user terminal.

[0014] Furthermore, the lightweight core network deployed in the small base station is provided with an NGAP signaling interface for implementing the basic access signaling of the user terminal.

[0015] Furthermore, the lightweight core network deployed in the small base station is deployed with an authentication function for implementing the IMSI authentication of the user terminal.

[0016] Furthermore, the lightweight core network deployed in the small base station is deployed with a user plane function for implementing the data routing and forwarding of the user terminal.

[0017] Furthermore, the user plane function deployed in the lightweight core network has an IP address pool;

[0018] The user plane function assigns a fixed IP address to the user terminal according to the IMSI of the user terminal.

[0019] Furthermore, the user plane function deployed in the lightweight core network performs data forwarding in the tunnel interface mode.

[0020] Furthermore, a small base station data communication system includes:

[0021] A radio frequency unit for receiving the first data sent by the user terminal;

[0022] A protocol stack processing unit for receiving the first data sent by the radio frequency unit;

[0023] A lightweight core network for receiving the first data sent by the protocol stack processing unit;

[0024] The lightweight core network sends the first data to the network device for interaction to receive the second data for the first data;

[0025] The second data is sent to the protocol stack processing unit through the lightweight core network, then sent to the radio frequency unit by the protocol stack processing unit, and finally returned to the user terminal by the radio frequency unit.

[0026] Furthermore, the lightweight core network includes:

[0027] An NGAP signaling interface for implementing the basic access signaling of the user terminal;

[0028] An authentication module for implementing the IMSI authentication of the user terminal;

[0029] The user plane module is used to implement data routing and forwarding for user terminals.

[0030] Furthermore, the user plane module has an IP address pool;

[0031] The user plane module allocates a fixed IP address to the user terminal according to the IMSI of the user terminal.

[0032] Furthermore, the user plane module forwards data through the tunnel interface method.

[0033] The technical solution provided by the embodiments of the present application has at least the following beneficial effects:

[0034] The present application provides a data communication system with low construction cost, convenient operation and maintenance, and a data communication method for small base stations. By integrating 5G small base stations with a lightweight 5G core network, 5G signal coverage and 5G-based data transmission services can be provided as soon as the 5G small base station equipment is powered on, so as to solve the problem of difficult networking of 5G small base stations at present, reduce the networking cost, and improve the convenience of later operation and maintenance. Description of the Drawings

[0035] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0036] Figure 1 This is a data communication method for a small base station provided by an embodiment of the present application.

[0037] Figure 2 This is a schematic diagram of a small base station data communication system provided by an embodiment of the present application. Detailed Embodiments

[0038] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] Please refer to Figure 1 , the present application provides an embodiment of a data communication method for a small base station, including:

[0040] S100: The radio frequency unit receives the first data sent by the user terminal;

[0041] S200: The radio frequency unit sends the first data to the protocol stack processing unit;

[0042] S300: The protocol stack processing unit sends the first data to the lightweight core network deployed in the small base station;

[0043] S400: The lightweight core network sends the first data to the network device for interaction and receives the second data for the first data;

[0044] S500: The lightweight core network sends the second data to the protocol stack processing unit;

[0045] S600: The protocol stack processing unit sends the second data to the radio frequency unit;

[0046] S700: The radio frequency unit returns the second data to the user terminal.

[0047] It can be understood that the small base station (Small Cell) uses a low-power radio access node and is a brand-new network architecture system. It works in licensed and unlicensed spectrums and can cover a range of 10 meters to 200 meters. The small base station SmallCell integrates femtocell, picocell, microcell, and distributed radio technologies, such as Remote Radio Head (RRH). The small base station Small Cell is a small, indoor-installable, and flexible-configured base station; it uses a fixed broadband network as the backhaul to access the operator's core network; it can well solve the problem of weak coverage of 5G network signals indoors and provide high-quality signal coverage in a small area. It is mainly used to solve the network capacity and 5G signal coverage problems in a small area.

[0048] Furthermore, in the method embodiment provided in this application, a radio frequency unit, a protocol stack processing unit, and a lightweight core network unit are integrated on the 5G small base station Small Cell.

[0049] It can be understood that the radio frequency unit (Remote Radio Unit, RRU) described in the method embodiment of the present application is divided into a proximal unit, i.e., a radio server (RS), and a distal unit, i.e., a radio remote unit (RRU). The two are connected by an optical fiber, and its interface is based on an open CPRI or IR interface, which can be stably connected to devices of mainstream manufacturers. The proximal unit RS can be installed at a suitable location in the computer room, and the distal unit RRU is installed at the antenna end. In this way, a part of the previous base station module is separated. By separating the proximal unit and the distal unit, the cumbersome maintenance work can be simplified to the proximal unit. One proximal unit can be connected to multiple distal units, which not only saves space but also reduces the setup cost and improves the networking efficiency.

[0050] The protocol stack described in the method embodiment of the present application, also known as protocol stacking, is a specific software implementation of a computer network protocol suite. A protocol in a protocol suite is usually designed for only one purpose, which makes the design easier. Since each protocol module usually communicates with the two other protocol modules above and below it, they can usually be imagined as layers in the protocol stack. The lowest-level protocol always describes the physical interaction with the hardware. Each higher level adds more features. The user application only processes the top-level protocol.

[0051] The lightweight core network described in the method embodiment of the present application generally covers two series, namely the 4G core network (Evolved Packet Core, EPC) and the 5G core network (5G Core network, 5GC), which are respectively used to form an end-to-end networking ability together with the 4G radio access network (Radio Access Network, RAN) and 5G NR (New Radio), and complete the independent networking of the 4G radio access network RAN, the independent networking SA or non-independent networking NSA of 5G NR, etc. The product supports all standard interfaces and functions defined by the 3rd Generation Partnership Project (3GPP), and together with the radio access network RAN or NR network, it completes user experience (User Experience, UE) access, authentication, registration, connection, mobility management, data storage management, and mobility management, etc., and also supports the end-to-end network construction of private networks.

[0052] Compared with the lightweight core network of this embodiment, the Core Network can divide the mobile network into three parts: the base station subsystem, the network subsystem, and the system support part. The core network part is located within the network subsystem. The main function of the core network is to connect call requests or data requests to different networks. The functions of the core network are to provide user connections, manage users, and carry services, and to provide an interface to external networks as a bearer network.

[0053] Specifically, the method embodiment provided in this application integrates the 5G small base station with the lightweight 5G core network to enable the 5G small base station device to provide 5G signal coverage and 5G-based data transmission services as soon as it is powered on, solving the problem of difficult networking of existing 5G small base stations.

[0054] It should be noted that the embodiment provided in this application can currently only provide data services based on 5G signals. Of course, the 5GC core part can also be configured as needed to achieve the function of supporting voice calls.

[0055] Specifically, the way to implement data communication in the method embodiment provided in this application is as follows: When a user has a need to use the network, a signal is sent from a user terminal such as a mobile phone or a computer, which is the first data described in this embodiment. The radio frequency unit RRU receives the first data sent by the user terminal and forwards it to the protocol stack processing unit. When the protocol stack processing unit receives the first data, it processes the first data through the protocol stack protocol and then sends it to the lightweight core network deployed in the small base station. The lightweight core network sends the first data to the network device for interaction to obtain the second data for the first data. The second data obtained through the interaction between the lightweight core network and the network device is received by the lightweight core network and sent back to the protocol stack processing unit. The protocol stack processing unit then forwards the second data to the radio frequency unit RRU. Finally, the radio frequency unit RRU feeds back the second data to the user terminal that sent the first data. In this way, data communication of the 5G small base station can be achieved through such forwarding, interaction, and feedback methods.

[0056] Furthermore, the lightweight core network deployed in the small base station is provided with an NGAP signaling interface for implementing the basic access signaling of the user terminal.

[0057] It can be understood that NGAP is used to provide signaling services between the 5G Radio Access Network (NG RAN) and the AMF network protocol (Action Message Format). The NGAP signaling services are mainly divided into two categories: user equipment-related services and non-user equipment-related services. The method embodiments provided in this application adopt the user equipment-related services of the NGAP signaling services. The user equipment-related services of the NGAP signaling services specifically include: providing signaling and connections for user equipment; managing protocol data unit (PDU) session processes and resources related to PDU sessions; managing user equipment context processes, specifically including establishing, modifying, and releasing user equipment context; managing user equipment mobility processes, handovers, and path change requests; paging processes, paging user equipment; and transmitting up and down 5G network attached storage (NAS) messages for the NAS message transmission process. In the embodiments provided in this application, the NGAP signaling services are used to provide signaling and connections for user equipment to achieve the basic access signaling of user equipment.

[0058] Furthermore, the lightweight core network deployed in the small base station is deployed with an authentication function for implementing the IMSI authentication of user equipment.

[0059] It can be understood that IMSI authentication is fully called International Mobile Subscriber Identity (IMSI) authentication. It is an identification code used to distinguish different users in a cellular network and is unique in all cellular networks. The mobile phone sends the International Mobile Subscriber Identity (IMSI) stored in a 64-bit field to the network. The International Mobile Subscriber Identity (IMSI) can be used to query user information in the Home Location Register (HLR) or the Visitor Location Register (VLR). As long as a user of a mobile network needs to communicate with other mobile networks, the International Mobile Subscriber Identity (IMSI) must be used.

[0060] Specifically, the International Mobile Subscriber Identity (IMSI) consists of a string of decimal digits with a maximum length of 15 digits. It is formed by sequentially connecting the Mobile Country Code (MCC), the Mobile Network Code (MNC), and the Mobile Subscription Identification Number (MSIN). The length of the Mobile Country Code (MCC) is 3 digits. The length of the Mobile Network Code (MNC) is determined by the value of the Mobile Country Code (MCC). The value of the Mobile Subscription Identification Number (MSIN) is assigned by the operator itself. In this embodiment, this authentication technology is deployed in the lightweight core network of the small base station to implement the authentication of the International Mobile Subscriber Identity (IMSI) of the user terminal.

[0061] Furthermore, the user plane function is deployed in the lightweight core network of the small base station, which is used to implement data routing and forwarding of the user terminal.

[0062] Furthermore, the user plane function deployed in the lightweight core network has an IP address pool;

[0063] The user plane function assigns a fixed IP address to the user terminal according to the IMSI of the user terminal.

[0064] Specifically, in this embodiment, in order to implement data routing and forwarding of the user terminal, the lightweight core network of the small base station provided in this embodiment also sets up a user plane function. When the user terminal sends the first data, the Radio Remote Unit (RRU) receives the first data and sends it to the protocol stack processing unit. Then, when the protocol stack processing unit sends the first data to the lightweight core network, the lightweight core network will perform routing and forwarding processing on the first data through the user plane function. Similarly, when the lightweight core network sends the first data to the network device for interaction and receives the second data for the first data, it also performs routing and forwarding processing on the second data through the user plane function.

[0065] Furthermore, for the convenience of using the user plane function of the lightweight core network, the user plane function of this embodiment has an IP address pool. It can be understood that after the user enables the Dynamic Host Configuration Protocol (DHCP), a starting IP address and an ending IP address can be set, thus forming an address pool. The addresses in the address pool can be dynamically assigned to the client machines in the network. The IP address pool is a segment or a range of IPs, which is mainly used for special IP segments.

[0066] It should be noted that the Dynamic Host Configuration Protocol (DHCP) here is a network protocol for a local area network. It means that a server controls a range of IP addresses, and when a client logs in to the server, it can automatically obtain the IP address and subnet mask assigned by the server.

[0067] Specifically, in the embodiments provided in the present application, the user plane function of the lightweight core network will assign a fixed IP address to the user terminal according to the International Mobile Subscriber Identity (IMSI) authenticated by the user terminal through the authentication function deployed in the lightweight core network. That is, the IMSI inside the small base station is bound to the IP address pool of the user plane to achieve the allocation of a fixed IP for the user terminal.

[0068] Furthermore, the user plane function deployed in the lightweight core network performs data forwarding in the tunnel interface manner.

[0069] Specifically, in order to achieve high-speed data forwarding, this embodiment adopts a method of tunnel interface in an Internet protocol.

[0070] It can be understood that the essence of the tunneling technology is to use a network layer protocol to transmit another network layer protocol. Its basic functions are encapsulation and encryption, mainly achieved by using network tunnels. For building a VPN, the tunneling technology is a key technology. It is used to simulate a point-to-point path in the public IP network to achieve secure communication between two nodes: between VPN gateways, or between a VPN gateway and a VPN remote user. It enables data packets to be transmitted within a dedicated tunnel on the public network. The basic components of a tunnel include: a tunnel starting node; a tunnel ending node; and a packet network such as an IP network for routing. The embodiments of the present application adopt such a tunnel interface technology to achieve high-speed forwarding of the data sent by the user terminal.

[0071] Please refer to Figure 2 , furthermore, the present application provides a small base station data communication system, including:

[0072] A radio frequency unit, configured to receive the first data sent by the user terminal;

[0073] A protocol stack processing unit, configured to receive the first data sent by the radio frequency unit;

[0074] A lightweight core network, configured to receive the first data sent by the protocol stack processing unit;

[0075] The lightweight core network sends the first data to a network device and conducts interaction to receive the second data for the first data;

[0076] The second data is sent to the protocol stack processing unit through the lightweight core network, and then sent to the radio frequency unit by the protocol stack processing unit, and finally returned to the user terminal by the radio frequency unit.

[0077] Specifically, in the embodiment provided in this application, a radio frequency unit, a protocol stack processing unit, and a lightweight core network unit are integrated on a 5G small cell. By integrating the 5G small cell with the lightweight 5G core network, it is possible to provide 5G signal coverage and 5G-based data transmission services as soon as the 5G small cell device is powered on, solving the problem of difficult networking of existing 5G small cells.

[0078] It can be understood that the radio frequency unit (Remote Radio Unit, RRU) described in the embodiment of this application is divided into a proximal unit, namely a radio server (RS), and a distal unit, namely a radio remote unit RRU. The two are connected by optical fiber, and its interface is based on an open CPRI or IR interface, and can be stably connected to the devices of mainstream manufacturers. The proximal unit RS can be installed in a suitable computer room location, and the distal unit RRU is installed at the antenna end. In this way, a part of the previous base station module is separated. By separating the proximal unit and the distal unit, the cumbersome maintenance work can be simplified to the proximal unit. One proximal unit can be connected to multiple distal units, which not only saves space, but also reduces the setup cost and improves the networking efficiency.

[0079] The protocol stack described in this embodiment, also known as protocol stack, is a specific software implementation of a computer network protocol suite. A protocol in the protocol suite is usually designed for only one purpose, which makes the design easier. Since each protocol module usually communicates with the two other protocol modules above and below it, they can usually be imagined as layers in the protocol stack. The lowest-level protocol always describes the physical interaction with the hardware. Each higher level adds more features. The user application only processes the top-level protocol.

[0080] In this embodiment, the lightweight core network as a whole covers two series of 4G core network (Evolved Packet Core, EPC) and 5G core network (5G Core network, 5GC), which are respectively used to form end-to-end networking capabilities together with 4G radio access network (Radio Access Network, RAN) and 5G NR (New Radio), and complete the independent networking of 4G radio access network RAN, the independent networking SA or non-independent networking NSA of 5G NR, etc. The product supports all standard interfaces and functions defined by the 3rd Generation Partnership Project (3GPP), and together with the radio access network RAN or NR network, it completes user experience (User Experience, UE) access, authentication, registration, connection, mobility management, data storage management, and mobility management, etc., and also supports the end-to-end network construction of private networks.

[0081] It should be noted that the embodiment provided in this application can currently only provide data services based on 5G signals. Of course, the part of the 5GC core can also be configured as needed to support the function of voice calls.

[0082] Specifically, the embodiment of this data communication system provided in this application realizes the data communication between the user terminal and the small base station through the embodiment of the data communication method of the small base station provided in this application. When the user has a need to use the network, a signal is sent through user terminals such as mobile phones and computers, that is, the first data described in this embodiment. The radio frequency unit RRU receives the first data sent by the user terminal and forwards it to the protocol stack processing unit. When the protocol stack processing unit receives the first data, it processes the first data through the protocol stack protocol and then sends it to the lightweight core network deployed in the small base station. The lightweight core network sends the first data to the network device for interaction to obtain the second data for the first data. The second data obtained through the interaction between the lightweight core network and the network device will be received by the lightweight core network and sent back to the protocol stack processing unit. The protocol stack processing unit then forwards the second data to the radio frequency unit RRU. Finally, the radio frequency unit RRU feeds back the second data to the user terminal that sent the first data. Through such a way of forwarding, interacting, and feeding back, the data communication of the 5G small base station can be realized.

[0083] Furthermore, the lightweight core network includes:

[0084] The NGAP signaling interface is used to implement the basic access signaling of the user terminal;

[0085] The authentication module is used to implement the IMSI authentication of the user terminal;

[0086] The user plane module is used to implement data routing and forwarding for user terminals.

[0087] Furthermore, the user plane module has an IP address pool;

[0088] The user plane module allocates a fixed IP address to the user terminal according to the IMSI of the user terminal.

[0089] It can be understood that NGAP is used to provide signaling services between the 5G Radio Access Network (NG RAN) and the AMF network protocol (Action Message Format). NGAP signaling is mainly divided into two categories: user terminal-related services and non-user terminal-related services. The method embodiments provided in this application adopt the user terminal-related services of NGAP signaling. The user terminal-related services of NGAP signaling specifically include: providing signaling and connections for user terminals; managing protocol data unit (PDU) session management processes and PDU session-related resources; managing user terminal context management processes, specifically including user terminal context establishment, modification, and release; managing user terminal mobility management processes, handover, and path change requests; paging processes, paging user terminals; and network attached storage (NAS) message transfer processes, transmitting uplink and downlink 5G NAS messages. In the embodiments provided in this application, the NGAP signaling interface is used to provide signaling and connections for user terminals to implement the basic access signaling of user terminals.

[0090] It can be understood that IMSI authentication is fully called International Mobile Subscriber Identity (IMSI) authentication. It is an identification code used to distinguish different users in a cellular network and is unique in all cellular networks. The mobile phone sends the International Mobile Subscriber Identity (IMSI) stored in a 64-bit field to the network. The International Mobile Subscriber Identity (IMSI) can be used to query user information in the Home Location Register (HLR) or Visitor Location Register (VLR). As long as a user of a mobile network needs to communicate with other mobile networks, the International Mobile Subscriber Identity (IMSI) must be used.

[0091] Specifically, the International Mobile Subscriber Identity (IMSI) consists of a string of decimal digits with a maximum length of 15 bits. It is formed by sequentially connecting the Mobile Country Code (MCC), the Mobile Network Code (MNC), and the Mobile Subscription Identification Number (MSIN). The length of the Mobile Country Code MCC is 3 bits. The length of the Mobile Network Code MNC is determined by the value of the Mobile Country Code MCC. The value of the Mobile Subscription Identification Number MSIN is assigned by the operator itself. In this embodiment, an authentication module of this technology is deployed in the lightweight core network of the small cell to implement the authentication of the International Mobile Subscriber Identity (IMSI) of the user terminal.

[0092] Furthermore, in this embodiment, in order to implement data routing and forwarding of the user terminal, the lightweight core network of the small cell provided in this embodiment is also provided with a user plane module. When the user terminal sends the first data, the Radio Remote Unit (RRU) receives the first data and sends it to the protocol stack processing unit. When the protocol stack processing unit sends the first data to the lightweight core network, the lightweight core network will perform routing and forwarding processing on the first data through the user plane module. Similarly, when the lightweight core network sends the first data to the network device for interaction and receives the second data for the first data, the second data is also routed and forwarded through the user plane module.

[0093] Specifically, in the embodiment provided in this application, in order to facilitate the use of the user plane function of the lightweight core network, the user plane module of this embodiment has an IP address pool. It can be understood that after the user enables the Dynamic Host Configuration Protocol (DHCP), a starting IP address and an ending IP address can be set, thus forming an address pool. The addresses in the address pool can be dynamically allocated to the client computers in the network for use. The IP address pool is a segment or a range of IPs, which is mainly used for special IP segments.

[0094] It should be noted that the Dynamic Host Configuration Protocol (DHCP) here is a local area network protocol. It means that a server controls a range of IP addresses, and when a client logs in to the server, it can automatically obtain the IP address and subnet mask assigned by the server.

[0095] Specifically, in the embodiments provided in the present application, the user plane module of the lightweight core network assigns a fixed IP address to the user terminal according to the International Mobile Subscriber Identity (IMSI) authenticated by the authentication module deployed in the lightweight core network for the user terminal. That is, the IMSI inside the small base station is bound to the IP address pool of the user plane to achieve the allocation of a fixed IP for the user terminal.

[0096] Furthermore, the user plane module performs data forwarding through the tunnel interface method.

[0097] Specifically, in the embodiments provided in the present application, in order to achieve high-speed data forwarding, this embodiment adopts a method of tunnel interface in an Internet protocol. It can be understood that the essence of the tunneling technology is to use one network layer protocol to transmit another network layer protocol. Its basic functions are encapsulation and encryption, mainly realized by using network tunnels. For building a VPN, the tunneling technology is a key technology. It is used to simulate a point-to-point path in the public IP network to achieve secure communication between two nodes: between VPN gateways, or between a VPN gateway and a VPN remote user. It enables data packets to be transmitted within a dedicated tunnel on the public network. The basic components of a tunnel include: a tunnel start node; a tunnel end node; and a packet network such as an IP network for routing. The embodiments of the present application adopt such tunneling interface technology to achieve high-speed forwarding of the data sent by the user terminal.

[0098] It should be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, commodity or device including the said element.

[0099] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A data communication method for a small base station, characterized in that , including: The radio frequency unit receives the first data sent by the user terminal; The radio frequency unit sends the first data to the protocol stack processing unit; The protocol stack processing unit sends the first data to the lightweight core network deployed in the small base station; The lightweight core network sends the first data to the network device for interaction and receives the second data for the first data; The lightweight core network sends the second data to the protocol stack processing unit. Among them, the lightweight core network deployed in the small base station covers the 4G core network and the 5G core network, together constituting the 4G radio access network and the end-to-end networking of 5G NR. In addition, the lightweight core network deployed in the small base station also has an NGAP signaling interface for providing signaling and connections for the user terminal to implement the basic access signaling of the user terminal. NGAP is used to provide signaling services between the 5G radio access network and the AMF network protocol. The NGAP signaling service adopts user terminal-related services. The user terminal-related services of the NGAP signaling service specifically include: providing signaling and connections for the user terminal; for the protocol data unit session management process and protocol data unit PDU session-related resource management; for the user terminal context management process, specifically including user terminal context establishment, modification, and release; for the user terminal mobility management process, handover, and path change request; paging process, paging the user terminal; for the network attached storage message transfer process, transmitting the uplink and downlink 5G network attached storage NAS messages; The protocol stack processing unit sends the second data to the radio frequency unit; The radio frequency unit returns the second data to the user terminal; Among them, the radio frequency unit (Remote Radio Unit, RRU) is divided into a proximal unit, namely the radio baseband control (RadioServer, RS), and a distal unit, namely the radio frequency remote unit RRU. The two are connected by optical fiber, and its interface is based on the open CPRI or IR interface to stably connect with the equipment of mainstream manufacturers. The proximal unit RS is installed in the computer room location, and the distal unit RRU is installed at the antenna end. By separating the proximal unit and the distal unit, the maintenance work is simplified to the proximal unit, and one proximal unit is connected to multiple distal units; Among them, the lightweight core network deployed in the small base station is deployed with an authentication function for implementing the IMSI authentication of the user terminal; Among them, the lightweight core network deployed in the small base station is deployed with a user plane function for implementing data routing and forwarding of the user terminal; Among them, the user plane function deployed in the lightweight core network has an IP address pool; The user plane function assigns a fixed IP address to the user terminal according to the IMSI of the user terminal.

2. The data communication method for a small base station according to claim 1, characterized in that, The user plane function deployed in the lightweight core network uses the tunnel interface method for data forwarding.

3. A small base station data communication system based on the data communication method for a small base station according to any one of claims 1-2, characterized in that, Including: The radio frequency unit is used to receive the first data sent by the user terminal; The protocol stack processing unit is used to receive the first data sent by the radio frequency unit; The lightweight core network is used to receive the first data sent by the protocol stack processing unit; The lightweight core network sends the first data to the network device and interacts therewith to receive the second data for the first data; The second data is sent by the lightweight core network to the protocol stack processing unit, then sent by the protocol stack processing unit to the radio frequency unit, and finally returned by the radio frequency unit to the user terminal. Among them, the lightweight core network deployed in the small base station covers the 4G core network and the 5G core network, together constituting the 4G radio access network and the end-to-end networking of 5G NR. In addition, the lightweight core network deployed in the small base station also has an NGAP signaling interface for implementing the basic access signaling of the user terminal; The lightweight core network includes an authentication module for implementing the IMSI authentication of the user terminal; a user plane module for implementing the data routing and forwarding of the user terminal; The user plane module has an IP address pool; The user plane module assigns a fixed IP address to the user terminal according to the IMSI of the user terminal.

4. The small base station data communication system according to claim 3, characterized in that, The user plane module performs data forwarding through the tunnel interface method.

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