Communication method, backpack-type satellite base station, device and system

Abstract

The embodiments of the present application provide a communication method, a backpack satellite base station, a device and a system based on a backpack satellite base station. When the core network control plane network element determines that the first terminal and the second terminal are both located within the coverage area of ​​the cell corresponding to the same backpack satellite base station, the backpack satellite base station directly sends the service data sent by the first terminal to the second terminal through the data wireless bearer between the backpack satellite base station and the second terminal, instead of transmitting the service data to the second terminal via the satellite-core network-satellite-backpack satellite base station, thereby optimizing the data transmission path, reducing the data transmission of the satellite link, reducing the load of satellite communication, reducing the data transmission delay, and improving the user experience.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communication technology, and in particular to a communication method, a backpack-type satellite base station, a device and a system. Background Art

[0002] With the continuous development of wireless communication networks, their coverage is getting wider and wider. However, wide coverage means higher network construction and maintenance costs. Therefore, for remote mountainous areas and uninhabited areas, operators usually do not build ground base stations for wireless cellular communications, but tend to use satellites for coverage. However, traditional satellite base stations require terminals to have special access capabilities to communicate wirelessly through satellite base stations. Therefore, a large number of ordinary terminals cannot communicate directly with satellite base stations. If ordinary ground base stations are damaged due to natural disasters or man-made disasters, a large number of ordinary terminals can neither transmit outward through ordinary ground base stations nor directly transmit data with satellites.

[0003] In order to solve this problem, a backpack-type satellite base station came into being. The ground base station of wireless cellular communication is connected to the core network through optical fiber, and the backpack-type satellite base station is connected to the satellite through wireless signals, and then connected to the ground core network through the satellite. This is equivalent to replacing the "base station-core network" transmission section of the traditional wireless cellular network with a satellite link.

[0004] However, during the communication process, if the sending terminal (also called the source terminal) and the receiving terminal (also called the target terminal) are both located within the coverage area of ​​the cell corresponding to the backpack satellite base station, it means that the data needs to go through the source terminal-backpack satellite base station-satellite-core network gateway-IP network-core network gateway-satellite-backpack satellite base station-target terminal, that is, it needs to go through four satellite links. It can be seen that there are many satellite links in the data transmission link, and there are problems such as heavy load on the satellite communication link and large data transmission delay. Summary of the invention

[0005] The embodiments of the present application provide a communication method, a backpack satellite base station, a communication device and a system based on a backpack satellite base station, which can optimize the data transmission path when the sending terminal and the receiving terminal are both located within the cell coverage area corresponding to the backpack satellite base station, thereby reducing the satellite communication load and data transmission delay, and improving the user experience.

[0006] A first aspect of the present application provides a communication method of a backpack-type satellite base station, comprising:

[0007] The backpack satellite base station receives the service request message sent by the first terminal and forwards it to the core network control plane network element via the satellite;

[0008] The backpack satellite base station establishes a first data radio bearer between the backpack satellite base station and the first terminal;

[0009] The backpack satellite base station receives a service establishment response message sent by the core network control plane network element via a satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in a cell of the backpack satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station;

[0010] The backpack satellite base station receives the service data sent by the first terminal through the first data radio bearer, and sends the service data to the second terminal through the second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network;

[0011] Among them, when the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the second data radio bearer is the data radio bearer between the backpack satellite base station and the second terminal, and the mapping relationship between the first data radio bearer and the second data radio bearer is established by the backpack satellite base station.

[0012] In some embodiments, when the core network control plane network element determines that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station based on the mapping relationship between the data radio bearer and the cell, the first terminal and the second terminal are both located in the cell of the backpack satellite base station, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

[0013] In some embodiments, the backpack satellite base station and the core network control plane network element establish a first bearer between the backpack satellite base station and the core network for a first terminal, so that the core network control plane network element establishes a mapping relationship between a first pipe and a cell, wherein the first pipe includes a first data radio bearer and a first bearer, and the mapping relationship between the first data radio bearer and the cell is realized through the mapping relationship between the first pipe and the cell; the backpack satellite base station and the core network control plane network element establish a second bearer between the backpack satellite base station and the core network for a second terminal, so that the core network control plane network element establishes a mapping relationship between the second pipe and the cell, wherein the second pipe includes a second data radio bearer and a second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through the mapping relationship between the second pipe and the cell.

[0014] In some embodiments, the mapping relationship between the first pipe and the cell is a mapping relationship between an identifier of the first pipe and an identifier of the cell, and the mapping relationship between the second pipe and the cell is a mapping relationship between an identifier of the second pipe and an identifier of the cell.

[0015] In some embodiments, the backpack satellite base station and the core network control plane network element establish a first bearer between the backpack satellite base station and the core network for the first terminal and establish a second bearer between the backpack satellite base station and the core network for the second terminal; the backpack satellite base station sends information about the first data radio bearer to the core network control plane network element through the first bearer and sends information about the second data radio bearer to the core network control plane network element through the second bearer, so that the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell and a mapping relationship between the second data radio bearer and the cell.

[0016] In some embodiments, the mapping relationship between the first data radio bearer and the cell is a mapping relationship between the first data radio bearer identifier and the cell identifier, and the mapping relationship between the second data radio bearer and the cell is a mapping relationship between the second data radio bearer identifier and the cell identifier.

[0017] The second aspect of the present application provides a backpack-type satellite base station, comprising: a transceiver module, a processing module and a storage module, wherein:

[0018] A transceiver module, configured to receive a service request message sent by the first terminal and forward it to a core network control plane network element via a satellite;

[0019] A processing module, configured to establish a first data radio bearer between the backpack satellite base station and the first terminal;

[0020] The transceiver module is further used to receive a service establishment response message sent by a core network control plane network element via a satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in a cell of a backpack-type satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack-type satellite base station; receive service data sent by the first terminal via a first data radio bearer, and send service data to the second terminal via a second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack-type satellite base station and a mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network;

[0021] The processing module is further used to establish a second data radio bearer between the backpack satellite base station and the second terminal when both the first terminal and the second terminal are located in the cell of the backpack satellite base station, and to establish a mapping relationship between the first data radio bearer and the second data radio bearer;

[0022] The storage module is used to store the mapping relationship between the first data radio bearer and the second data radio bearer.

[0023] In some embodiments, when the core network control plane network element determines that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station based on the mapping relationship between the data radio bearer and the cell, the first terminal and the second terminal are both located in the cell of the backpack satellite base station, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

[0024] In some embodiments, the processing module is further used to establish a first bearer between a backpack-type satellite base station for a first terminal and the core network with a core network control plane network element, so that the core network control plane network element establishes a mapping relationship between a first pipe and a cell, wherein the first pipe includes a first data radio bearer and a first bearer, and the mapping relationship between the first data radio bearer and the cell is realized through a mapping relationship between the first pipe and the cell; the processing module is further used to establish a second bearer between a backpack-type satellite base station for a second terminal and the core network with a core network control plane network element, so that the core network control plane network element establishes a mapping relationship between a second pipe and a cell, wherein the second pipe includes a second data radio bearer and a second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through a mapping relationship between the second pipe and the cell.

[0025] In some embodiments, the mapping relationship between the first pipe and the cell is a mapping relationship between an identifier of the first pipe and an identifier of the cell, and the mapping relationship between the second pipe and the cell is a mapping relationship between an identifier of the second pipe and an identifier of the cell.

[0026] In some embodiments, the processing module is also used to establish a first bearer between the backpack satellite base station for the first terminal and the core network, and to establish a second bearer between the backpack satellite base station for the second terminal and the core network with the core network control plane network element; the transceiver module is also used to send information about the first data wireless bearer to the core network control plane network element through the first bearer and to send information about the second data wireless bearer to the core network control plane network element through the second bearer, so that the core network control plane network element establishes a mapping relationship between the first data wireless bearer and the cell, and a mapping relationship between the second data wireless bearer and the cell.

[0027] In some embodiments, the mapping relationship between the first data radio bearer and the cell is a mapping relationship between the first data radio bearer identifier and the cell identifier, and the mapping relationship between the second data radio bearer and the cell is a mapping relationship between the second data radio bearer identifier and the cell identifier.

[0028] A third aspect of the present application provides a communication device, characterized in that it includes: a transceiver, a processor, and a memory, wherein:

[0029] A transceiver, configured to receive a service request message sent by the first terminal and forward it to a core network control plane network element via a satellite;

[0030] A processor, configured to establish a first data radio bearer between the backpack satellite base station and the first terminal;

[0031] The transceiver is further used to receive a service establishment response message sent by a core network control plane network element via a satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in a cell of a backpack-type satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack-type satellite base station; receive service data sent by the first terminal via a first data radio bearer, and send service data to the second terminal via a second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack-type satellite base station and a mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network;

[0032] The processor is further configured to establish a second data radio bearer between the backpack satellite base station and the second terminal, and establish a mapping relationship between the first data radio bearer and the second data radio bearer when both the first terminal and the second terminal are located in the cell of the backpack satellite base station;

[0033] The memory is used to store a mapping relationship between the first data radio bearer and the second data radio bearer.

[0034] The fourth aspect of the present application provides a communication system, comprising: a core network control plane network element and the above-mentioned backpack-type satellite base station, and the core network control plane network element is communicatively connected with the backpack-type satellite base station.

[0035] The fifth aspect of the present application provides a communication device, including: a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps performed by the backpack satellite base station in the above communication method are implemented.

[0036] The sixth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps performed by the backpack satellite base station in the above-mentioned communication method are implemented.

[0037] In this embodiment, when the core network control plane network element determines that the first terminal and the second terminal are both located within the cell coverage corresponding to the same backpack satellite base station (that is, the first terminal and the second terminal belong to the same backpack satellite base station), the backpack satellite base station provides direct data transmission between the first terminal and the second terminal, that is, the backpack satellite base station sends the service data sent by the first terminal directly to the second terminal through the data wireless bearer between the backpack satellite base station and the second terminal, instead of transmitting the service data to the second terminal via the satellite-core network-satellite-the backpack satellite base station, thereby optimizing the data transmission path, reducing the data transmission of the satellite link, reducing the load of satellite communication, reducing the data transmission delay, and improving the user experience.

[0038] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a flow chart of a terminal registering a core network via a backpack-type satellite base station provided in an embodiment of the present application.

[0041] Figure 2 It is a flow chart of a communication method based on a backpack-type satellite base station provided in an embodiment of the present application.

[0042] Figure 3 It is a structural diagram of a communication system based on a backpack-type satellite base station provided in an embodiment of the present application.

[0043] Figure 4 It is a structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B can exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0049] In the description of this application, unless otherwise specified, "multiple" and "at least two" mean more than two (including two). Similarly, "multiple groups" and "at least two groups" mean more than two groups (including two).

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, "connected" or "connection" can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In order to make those skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings. It should be noted that different technical features in the present application can be combined with each other without conflict.

[0052] In an embodiment of the present application, a backpack-type satellite base station is a base station that relies on a high-throughput satellite platform as a transmission carrier, providing communication between a terminal and a satellite. The backpack-type satellite base station may also be referred to as a portable satellite base station or a mobile satellite base station.

[0053] The backpack satellite base station communicates with the core network of the communication network via a satellite. The communication network may be a 3G, 4G, 5G or next generation mobile communication system. For example, the mobile communication system may be a wideband code division multiple access (WCDMA) system, a frequency division multiple access (FDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier FDMA (SC-FDMA) system, a general packet radio service (GPRS) system, a long term evolution (LTE) system or a 5G mobile communication network, as well as other such communication systems.

[0054] The terminal can be a wireless terminal or a wired terminal. The wireless terminal can be a device that provides voice and / or other business data connectivity to users, a handheld device with wireless connection function, or other processing equipment connected to a wireless modem. The wireless terminal can communicate with one or more core networks via a radio access network (RAN). The wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket, handheld, computer-built-in or vehicle-mounted mobile device, which exchanges voice and / or data with the radio access network.

[0055] For example, the terminal can be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a drone, a wearable device, a terminal in the Internet of Vehicles, and other devices. A wireless terminal may also be referred to as a system, a subscriber unit (subscriberunit), a subscriber station (subscriber station), a mobile station (mobile station), a mobile station (mobile), a remote station (remote station), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), a user device (user device or user equipment), and a user equipment (user equipment, UE), which is not limited here. In addition, the terminal may use a mobile operating system such as iOS or Android or Hongmeng, which is not limited in this application.

[0056] like Figure 1 As shown, it is a schematic diagram of the process of a terminal registering a core network through a backpack-type satellite base station in an embodiment of the present application. In this embodiment, the terminal can be either a sending terminal (for example, a first terminal) or a receiving terminal (for example, a second terminal). This embodiment is not limited. The process of the terminal registering a core network through a backpack-type satellite base station is as follows.

[0057] Step 101, the backpack satellite base station broadcasts a system message.

[0058] The system message carries: information that the cell is a backpack satellite base station cell or information that the base station is a backpack satellite base station.

[0059] Step 102: The backpack satellite base station sends a notification message to a core network control plane network element via a satellite.

[0060] For example, the core network control plane network element may be a mobility management entity (MME) of a 4G communication system or an access and mobility management function (AMF) entity of a 5G communication system, but this embodiment is not limited thereto.

[0061] The notification message is used to notify the core network control plane network element: this cell is a backpack satellite base station cell or this base station is a backpack satellite base station.

[0062] Step 103: The backpack satellite base station establishes a radio resource control (RRC) connection with the terminal.

[0063] For example, the terminal changes from an off state to an on state (for example, the terminal is turned on), or the access layer of the terminal changes from an idle state (RRC IDLE) to a connected state (RRC connection), or the terminal undergoes a cell handover (mainly a handover of the RRC layer, for example, a tracking area update (TAU) process), and the terminal initiates an RRC connection establishment process to the backpack satellite base station.

[0064] During the RRC connection process, the backpack satellite base station allocates a cell-radio network temporary identifier (C-RNTI) to the terminal and sends it to the terminal. For example, the backpack satellite base station sends the C-RNTI to the terminal via an RRC message. For example, the RRC message may be an RRC connection setup message (Msg4).

[0065] C-RNTI is a dynamic identifier assigned to a terminal by a backpack satellite base station. C-RNTI uniquely identifies a terminal under the air interface of a cell. The backpack satellite base station assigns different C-RNTIs to different terminals, and C-RNTI is only valid for terminals in the RRC connected state.

[0066] For example, the terminal can be a sending terminal, for example, a first terminal. When the first terminal accesses a backpack satellite base station, the backpack satellite base station allocates a corresponding C-RNTI to the first terminal, for example, a first C-RNIT. When the first terminal exits the RRC connection state, the first terminal releases its C-RNTI, that is, releases the first C-RNTI. When the first terminal accesses the backpack satellite base station again, the backpack satellite base station allocates a new C-RNTI to the first terminal.

[0067] For example, the terminal can be a receiving terminal, for example, a second terminal. When the second terminal accesses the backpack satellite base station, the backpack satellite base station allocates a corresponding C-RNTI to the second terminal, for example, a second C-RNIT. When the second terminal exits the RRC connection state, the second terminal releases its C-RNTI, that is, releases the second C-RNTI. When the second terminal accesses the backpack satellite base station again, the backpack satellite base station allocates a new C-RNTI to the second terminal.

[0068] When the terminal exits the RRC connection state, for example, the terminal updates its location and exits the cell of the backpack satellite base station or the terminal exits the RRC connection state due to poor signal, the terminal releases its C-RNTI. When the terminal accesses the base station of the new cell, the base station of the new cell allocates a new C-RNTI to the terminal. When the terminal establishes an RRC connection with the backpack satellite base station again, the backpack satellite base station allocates a new C-RNTI again.

[0069] Step 104: The backpack satellite base station receives the registration request message sent by the terminal and forwards it to the core network control plane network element.

[0070] For example, the terminal sends a registration request message to a backpack satellite base station, and the backpack satellite base station sends the registration request message to the core network control plane network element via the satellite. For example, in a 4G communication system, the registration request message is an Attach request message, and in a 5G communication system, the registration request message is a Registration request message.

[0071] The registration request message carries the user equipment identifier (UE ID), cell identifier (Cell ID) and user capability (UE Capability) information of the terminal.

[0072] UE ID is used to uniquely identify the terminal. UE ID can be an international mobile equipment identity (IMEI), an international mobile subscriber identity (IMSI) or a system architecture evolution (SAE) temporary mobile station identifier (S-TMSI).

[0073] In different communication systems, the registration request message carries the cell identifier through different fields. For example, in the 3G communication system, the registration request message carries the cell global identity (CGI), which includes the cell identifier; in the 4G communication system, the registration request message carries the Evolved UMTS terrestrial radio access network (E-UTRAN) EUTRA cell global identifier (ECGI), which includes the cell identifier; in the 5G communication system, the registration request message carries the New Radio (NR) cell global identifier (NCGI), which includes the cell identifier.

[0074] Step 105: The backpack satellite base station receives a registration success message sent by the core network control plane network element and forwards it to the terminal.

[0075] For example, the backpack satellite base station receives a registration success message sent by the core network control plane network element via the satellite.

[0076] In another embodiment of the present application, when a terminal (for example, a first terminal or a second terminal) exits the RRC connection state from a backpack satellite base station, for example, the terminal updates its location and exits the cell of the backpack satellite base station or the terminal exits the RRC connection state due to poor signal, the terminal releases the temporary cell wireless network identifier allocated to it by the backpack satellite base station.

[0077] When the terminal needs to re-establish an RRC connection with the backpack satellite base station, the backpack satellite base station receives the RRC connection request message re-sent by the terminal, and establishes a new mapping relationship between the cell wireless network temporary identifier and the temporary terminal identifier for the terminal. For example, when the terminal accesses the backpack satellite base station again due to location area update, the terminal sends an RRC connection request message to the backpack satellite base station; when the terminal exits the RRC connection state due to poor signal and needs to re-access the backpack satellite base station, the terminal sends an RRC re-establishment request message to the backpack satellite base station, and the backpack satellite base station allocates a new C-RNTI for the terminal.

[0078] like Figure 2 As shown, it is a flow chart of the communication method of the backpack satellite base station provided in an embodiment of the present application. In this embodiment, the first terminal is the source terminal (i.e., the sending terminal) for sending business data, and the second terminal is the target terminal (i.e., the receiving terminal) for receiving business data, and vice versa.

[0079] Step 201: A first terminal sends a service request message to a core network control plane network element via a backpack satellite base station.

[0080] The core network control plane network element can be the MME in the 4G communication system or the AMF in the 5G communication system.

[0081] For example, the first terminal sends a service request message to the backpack satellite base station where it is located, and the backpack satellite base station sends the service request message to the core network control plane network element via the satellite. The service request message carries the application layer identifier of the second terminal, for example, the application layer identifier can be a user equipment identifier (UE ID), a user identity identifier or a user identifier. The user equipment identifier of the second terminal can be the IMEI, IMSI or S-TMSI of the second terminal, which is not specifically limited in this application.

[0082] Step 202: The backpack satellite base station establishes a data radio bearer with the first terminal and establishes a bearer for the first terminal with the core network.

[0083] For example, after receiving the service request, the core network control plane network element (for example, MME or AMF) sends a bearer establishment message to the backpack satellite base station where the first terminal is located, wherein the bearer establishment message carries a bearer establishment command. For example, the core network control plane network element sends an initial context setup request (initial context setup request) message to the backpack satellite base station, and the initial context setup request message carries the bearer establishment command.

[0084] After the backpack satellite base station where the first terminal is located receives a bearer establishment message (for example, an initial context setup request message) sent by a core network control plane network element, it allocates an identifier (for example, DRB A ID) for establishing a first data radio bearer (DRB) according to the bearer establishment command and configures DRB QoS parameters according to the quality of service (QoS) parameters received from the core network control plane network element, and sends an RRC connection reconfiguration message to the first terminal according to the cell wireless network temporary identifier of the first terminal. The RRC connection reconfiguration message carries the bearer establishment command and the cell wireless network temporary identifier of the first terminal.

[0085] After the first terminal receives the RRC connection reconfiguration message, it configures bearer parameters according to the bearer establishment command carried by the RRC connection reconfiguration message, for example, performs resource reconfiguration, for example, reconfigures SRB and wireless resource configuration, establishes a first signaling radio bearer (signalling radio bearer, SRB) and a first data radio bearer (for example, DRB A), etc. After the configuration is completed, an RRC connection reconfiguration complete (RRC connection reconfiguration complete) message is sent to the backpack satellite base station. The backpack satellite base station receives the RRC connection reconfiguration complete message sent by the first terminal, indicating that the resource configuration is completed. Then, the radio bearer (Radio Bearer, RB) (for example, the first radio bearer) between the first terminal and the backpack satellite base station is established. The RB between the first terminal and the backpack satellite base station includes the first SRB and the first data radio bearer (for example, DRB A) between the first terminal and the backpack satellite base station.

[0086] The backpack satellite base station where the first terminal is located sends a bearer establishment completion message to the core network control plane network element. For example, the bearer establishment completion message can be an initial context setup response message, indicating that the context establishment of the first terminal is completed, that is, the bearer (for example, the first bearer) between the backpack satellite base station where the first terminal is located and the core network is also established, then the pipeline (for example, the first pipeline) between the first terminal and the core network is established, allowing the first terminal to transmit uplink data. Among them, the first bearer includes the first signaling bearer between the backpack satellite base station where the first terminal is located and the core network control plane network element and the first data bearer between the backpack satellite base station where the first terminal is located and the core network user plane network element. In the 4G communication system, the core network user plane network element includes a serving gateway (S-GW) and a packet data network gateway (PGW); in the 5G communication system, the core network user plane network element includes a user plane function (UPF) entity.

[0087] The first pipe includes an SRB (eg, a first SRB) between the first terminal and the backpack satellite base station, a first data radio bearer (eg, DRB A), and a first bearer.

[0088] The core network control plane network element establishes a mapping relationship between the first pipe and the cell, for example, a mapping relationship between the first pipe identifier and the cell identifier. The mapping relationship between the first pipe and the cell may indicate a mapping relationship between the first data radio bearer of the first terminal and the cell, that is, the mapping relationship between the first pipe and the cell is equivalent to the mapping relationship between the first data radio bearer and the cell, that is, the mapping relationship between the first data radio bearer and the cell may be realized through the mapping relationship between the first pipe and the cell, for example, through the mapping relationship between the first pipe identifier and the cell identifier. The mapping relationship between the first pipe and the cell may also indicate a mapping relationship between the SRB between the first terminal and the backpack satellite base station and the cell and indicate a mapping relationship between the first bearer and the cell.

[0089] In another embodiment of the present application, the backpack satellite base station can also send the first data radio bearer information, for example, the identifier of the first data radio bearer (for example, DRB A ID) to the core network control plane network element through the first bearer, and the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell, for example, establishes a mapping relationship between the identifier of the first data radio bearer and the cell identifier.

[0090] In another embodiment of the present application, the backpack satellite base station can also send SRB information between the first terminal and the backpack satellite base station to the core network control plane network element through the first bearer, for example, the SRB identifier between the first terminal and the backpack satellite base station. The core network control plane network element can also establish a mapping relationship between the SRB and the cell between the first terminal and the backpack satellite base station, for example, the mapping relationship between the SRB identifier and the cell identifier between the first terminal and the backpack satellite base station.

[0091] In another embodiment of the present application, the core network control plane network element may also establish a mapping relationship between the first bearer and the cell, for example, a mapping relationship between the identifier of the first bearer and the cell identifier.

[0092] Step 203: The base station where the second terminal is located establishes a data radio bearer with the second terminal and establishes a bearer for the second terminal with the core network.

[0093] For example, after receiving the service request message, the core network control plane network element (for example, MME or AMF) obtains the application layer identifier of the second terminal from the service request message, and determines the temporary terminal identifier (for example, S-TMSI) of the second terminal according to the application layer identifier of the second terminal. For example, when the application layer identifier is a temporary terminal identifier of the terminal (for example, S-TMSI), the core network control plane network element directly obtains the temporary terminal identifier of the second terminal in the service request; when the application layer identifier is other identifiers of the terminal, for example, when the application layer identifier is UE ID, the core network control plane network element determines the temporary terminal identifier of the second terminal corresponding to the application layer identifier of the second terminal according to the mapping relationship between the application layer identifier of the second terminal and the temporary terminal identifier of the second terminal and the application layer identifier of the second terminal obtained from the service request message.

[0094] The core network control plane network sends a paging request to the base station where the second terminal is located according to the temporary terminal identifier of the second terminal. The base station where the second terminal is located can be the backpack satellite base station where the first terminal is located, or can be other base stations, for example, the other base stations are ordinary ground base stations or another backpack satellite base station different from the backpack satellite base station where the first terminal is located.

[0095] After the base station where the second terminal is located receives the paging message sent by the core network control plane network element, it allocates a DRB ID (for example, DRB B ID) for establishing a second data radio bearer and configures the DRB QoS parameters according to the QoS parameters received from the core network control plane network element, and sends an RRC connection reconfiguration message to the second terminal according to the cell wireless network temporary identifier of the second terminal. The RRC connection reconfiguration message carries the bearer establishment command and the cell wireless network temporary identifier of the second terminal.

[0096] After the second terminal receives the RRC connection reconfiguration message, it configures bearer parameters according to the bearer establishment command carried by the RRC connection reconfiguration message, for example, performs resource reconfiguration, for example, reconfigures SRB and wireless resource configuration, establishes a second signaling radio bearer (SRB) and a second data radio bearer (for example, DRB B), etc. After the configuration is completed, an RRC connection reconfiguration completion message is sent to the base station where the second terminal is located. The base station where the second terminal is located receives the RRC connection reconfiguration completion message sent by the second terminal, indicating that the resource configuration is completed. Then, the second radio bearer (RB) between the second terminal and the base station where the second terminal is located is established, and the second RB includes the second SRB and the second data radio bearer (for example, DRB B).

[0097] The base station where the second terminal is located sends a bearer establishment completion message to the core network control plane network element. For example, the bearer establishment completion message can be an initial context establishment response message, indicating that the context establishment of the second terminal is completed, that is, the bearer (for example, the second bearer) between the base station where the second terminal is located and the core network for the second terminal is also established, and the pipe (for example, the second pipe) between the second terminal and the core network is established. The second bearer includes a second signaling bearer between the base station where the second terminal is located and the core network control plane network element for the second terminal and a second data bearer between the base station where the second terminal is located and the core network user plane network element.

[0098] The second pipe includes a second SRB, a second data radio bearer (eg, DRB B), and a second bearer.

[0099] The core network control plane network element establishes a mapping relationship between the second pipe and the cell, for example, a mapping relationship between the second pipe identifier and the cell identifier. The mapping relationship between the second pipe and the cell may indicate a mapping relationship between the second data radio bearer of the second terminal and the cell, that is, the mapping relationship between the second pipe and the cell is equivalent to the mapping relationship between the second data radio bearer and the cell, that is, the mapping relationship between the second data radio bearer and the cell may be realized through the mapping relationship between the second pipe and the cell, for example, through the mapping relationship between the second pipe identifier and the cell identifier. The mapping relationship between the second pipe and the cell may also indicate a mapping relationship between the SRB between the second terminal and the base station where the second terminal is located and the cell, and indicate a mapping relationship between the second bearer and the cell.

[0100] In another embodiment of the present application, the base station where the second terminal is located may also send second data radio bearer information, for example, an identifier of the second data radio bearer (for example, DRB B ID), to the core network control plane network element through the second bearer, and the core network control plane network element establishes a mapping relationship between the second data radio bearer and the cell, for example, establishes a mapping relationship between the identifier of the second data radio bearer and the cell identifier.

[0101] In another embodiment of the present application, the base station where the second terminal is located can also send information about the SRB between the second terminal and the base station where the second terminal is located to the core network control plane network element through the second bearer, for example, an identifier of the SRB between the second terminal and the base station where the second terminal is located. The core network control plane network element can also establish a mapping relationship between the SRB and the cell between the second terminal and the base station where the second terminal is located, for example, a mapping relationship between the SRB identifier and the cell identifier between the second terminal and the base station where the second terminal is located.

[0102] In another embodiment of the present application, the core network control plane network element may also establish a mapping relationship between the second bearer and the cell, for example, a mapping relationship between the identifier of the second bearer and the cell identifier.

[0103] When the base station where the second terminal is located is the backpack satellite base station where the first terminal is located, that is, the first terminal and the second terminal are located in the same backpack satellite base station (that is, the backpack satellite base station where the first terminal is located, recorded as the first backpack satellite base station), the backpack satellite base station where the first terminal is located establishes and maintains a mapping relationship between the first data radio bearer and the second data radio bearer. For example, the mapping relationship between the first data radio bearer and the second data radio bearer can be a mapping relationship between a first data radio bearer identifier and a second data radio bearer identifier, for example, a mapping relationship between a DRB A ID and a DRB B ID.

[0104] Step 204: The core network control plane network element determines whether the first terminal and the second terminal are both located in a cell of the same backpack satellite base station.

[0105] The first terminal and the second terminal are both located in the cell of the same backpack satellite base station, which may refer to the first terminal and the second terminal being located in the same cell of the same backpack satellite base station, or the first terminal and the second terminal being located in different cells of the same backpack satellite base station.

[0106] For example, the backpack-type satellite base station where the first terminal is located is only configured with one cell. When the core network control plane network element determines that the first terminal and the second terminal are both located in the same cell, the core network control plane network element determines that the first terminal and the second terminal are located in the same cell of the backpack-type satellite base station.

[0107] For example, the backpack-type satellite base station where the first terminal is located is configured with multiple cells. When the core network control plane network element determines that the first terminal and the second terminal are respectively located in any one or two cells of the multiple cells of the backpack-type satellite base station where the first terminal is located, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack-type satellite base station. For example, the backpack-type satellite base station where the first terminal is located is configured with a first cell and a second cell. When the core network control plane network element determines that the first terminal is located in the first cell and the second terminal is located in the first cell or the second cell, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack-type satellite base station; for example, when the core network control plane network element determines that the first terminal is located in the second cell and the second terminal is located in the first cell or the second cell, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack-type satellite base station.

[0108] The first terminal and the second terminal are not both located in the cell of the same backpack satellite base station means that the first terminal and the second terminal are respectively located in different cells of different base stations. For example, in this embodiment, the first terminal initiates a service request message through a backpack satellite base station, then the first terminal is located in the cell of the backpack satellite base station where the first terminal is located (for example, recorded as the first backpack satellite base station), and the second terminal is not located in the cell of the backpack satellite base station where the first terminal is located (that is, the first backpack satellite base station), that is, the second terminal is located in the cell of other base stations, and the other base stations can be either ordinary ground base stations or another backpack satellite base station (for example, the second backpack satellite base station).

[0109] The core network control plane network element can determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station (for example, the first backpack satellite base station where the first terminal is located) based on the mapping relationship between the data radio bearer and the cell. The mapping relationship between the data radio bearer and the cell includes a mapping relationship between the first data radio bearer and the cell and a mapping relationship between the second data radio bearer and the cell. For example, the core network control plane network element determines that the cell corresponding to the first data radio bearer is the cell of the backpack satellite base station where the first terminal is located based on the mapping relationship between the first data radio bearer and the cell, and the core network control plane network element determines whether the cell corresponding to the second data radio bearer is the cell of the backpack satellite base station where the first terminal is located based on the mapping relationship between the second data radio bearer and the cell.

[0110] When the core network control plane network element determines that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both the cells of the backpack satellite base station where the first terminal is located, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station; when the core network control plane network element determines that the cell corresponding to the first data radio bearer is the cell of the backpack satellite base station (for example, the first backpack satellite base station) where the first terminal is located, and the cell corresponding to the second data radio bearer is the cell of other base stations, the core network control plane network element determines that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station.

[0111] For example, after the pipeline (for example, the first pipeline) of the first terminal and the pipeline (for example, the second pipeline) of the second terminal are established, the core network control plane network element obtains information that the first terminal uses the first pipeline and information that the second terminal uses the second pipeline. The first data radio bearer included in the first pipeline is used for the first terminal, and the second data radio bearer included in the second pipeline is used for the second terminal. Therefore, the core network control plane network element can determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station according to the mapping relationship between the pipeline and the cell. For example, when the cell corresponding to the first pipeline and the cell corresponding to the second pipeline are both the cell of the same backpack satellite base station, that is, the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. For example, the core network control plane network element determines that the cell corresponding to the first pipeline is the cell of the backpack satellite base station where the first terminal is located according to the mapping relationship between the first pipeline and the cell, and determines whether the cell corresponding to the second pipeline is the cell of the backpack satellite base station where the first terminal is located according to the mapping relationship between the second pipeline and the cell; when the core network control plane network element determines that the cell corresponding to the first pipeline and the cell corresponding to the second pipeline are both the cell of the backpack satellite base station where the first terminal is located, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. When the core network control plane network element determines that the cell corresponding to the first pipeline is the cell of the backpack satellite base station (for example, the first backpack satellite base station) where the first terminal is located, and the cell corresponding to the second pipeline is the cell of other base stations, the core network control plane network element determines that the first terminal and the second terminal are not located in the same backpack satellite base station cell.

[0112] When the mapping relationship between the first pipe and the cell is the mapping relationship between the identifier of the first pipe and the cell identifier, and the mapping relationship between the second pipe and the cell is the mapping relationship between the identifier of the second pipe and the cell identifier, the core network control plane network element can determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station according to the mapping relationship between the identifier of the first pipe and the cell identifier and the mapping relationship between the identifier of the second pipe and the cell identifier. For example, the core network control plane network element finds the corresponding cell identifier according to the identifier of the first pipe and determines that the cell identifier corresponding to the identifier of the first pipe is the cell of the backpack satellite base station where the first terminal is located, the core network control plane network element finds the corresponding cell identifier according to the identifier of the second pipe, and the core network control plane network element determines whether the cell identifier corresponding to the identifier of the second pipe is the cell identifier of the backpack satellite base station where the first terminal is located. When the core network control plane network element determines that the cell identifier corresponding to the identifier of the first pipe and the cell identifier corresponding to the identifier of the second pipe are both the cell identifiers of the backpack satellite base station where the first terminal is located, the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. When the core network control plane network element determines that the cell identifier corresponding to the identifier of the first pipe is the cell identifier of the backpack satellite base station (for example, the first backpack satellite base station) where the first terminal is located, and the cell identifier corresponding to the identifier of the second pipe is the cell identifier of other base stations, the core network control plane network element determines that the first terminal and the second terminal are not located in the same cell of the backpack satellite base station.

[0113] In another embodiment of the present application, when the backpack satellite base station where the first terminal is located sends information about the first data radio bearer to the core network control plane network element through the first bearer, the base station where the second terminal is located sends information about the second data radio bearer to the core network control plane network element through the second bearer, and the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell and a mapping relationship between the second data radio bearer and the cell, the core network control plane network element can determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station based on the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell. When the core network control plane network element determines that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the same backpack satellite base station (for example, the backpack satellite base station where the first terminal is located), the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. When the core network control plane network element determines that the cell corresponding to the first data wireless bearer is the cell of the backpack satellite base station (for example, the first backpack satellite base station) where the first terminal is located, and the cell corresponding to the second data wireless bearer is the cell of other base stations, the core network control plane network element determines that the first terminal and the second terminal are not located in the same cell of the backpack satellite base station.

[0114] For example, the mapping relationship between the first data radio bearer and the cell is the mapping relationship between the identifier of the first data radio bearer and the cell identifier, and the mapping relationship between the second data radio bearer and the cell is the mapping relationship between the identifier of the second data radio bearer and the cell identifier. The core network control plane network element can determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station (i.e., the backpack satellite base station where the first terminal is located) based on the mapping relationship between the identifier of the first data radio bearer and the cell identifier and the mapping relationship between the identifier of the second data radio bearer and the cell identifier. When the core network control plane network element determines that the cell identifier corresponding to the identifier of the first data radio bearer and the cell identifier corresponding to the identifier of the second data radio bearer are both the cell identifiers of the same backpack satellite base station (i.e., the backpack satellite base station where the first terminal is located), the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. When the core network control plane network element determines that the cell identifier corresponding to the identifier of the first data wireless bearer is the cell identifier of the backpack satellite base station (for example, the first backpack satellite base station) where the first terminal is located, and the cell identifier corresponding to the identifier of the second data wireless bearer is the cell identifier of other base stations, the core network control plane network element determines that the first terminal and the second terminal are not located in the same cell of the backpack satellite base station.

[0115] Step 205: The backpack satellite base station where the first terminal is located receives a service establishment response message sent by the core network control plane network element.

[0116] For example, the backpack satellite base station where the first terminal is located receives a service establishment response message sent by the core network control plane network element via the satellite. The service establishment response message carries the temporary terminal identifier of the second terminal, for example, the second temporary terminal identifier, for example, S-TMSI B.

[0117] When the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, that is, the first terminal and the second terminal are both located in the cell of the backpack satellite base station where the first terminal is located (that is, the first backpack satellite base station), the service establishment response message received by the backpack satellite base station where the first terminal is located also carries information that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station.

[0118] When the core network control plane network element determines that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station, that is, the first terminal is located in the cell of the backpack satellite base station (that is, the first backpack satellite base station) where the first terminal is located, and the second terminal is located in the cell of other base stations, wherein the other base stations can be either ordinary ground base stations or another backpack satellite base station (that is, the second backpack satellite base station) different from the backpack satellite base station (that is, the first backpack satellite base station) where the first terminal is located, the service establishment response message received by the backpack satellite base station where the first terminal is located also carries the information that the first terminal and the second terminal are not both located in the same backpack satellite base station cell. In another embodiment of the present application, when the core network control plane network element determines that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station, the service establishment response message received by the backpack satellite base station where the first terminal is located may not carry the information that the first terminal and the second terminal are not both located in the same backpack satellite base station cell, that is, the service establishment response message carries the information that the first terminal and the second terminal are not both located in the same backpack satellite base station cell by default.

[0119] Step 206: The backpack satellite base station where the first terminal is located sends a service establishment response message to the first terminal.

[0120] Step 207: The backpack-type satellite base station where the first terminal is located receives the service data sent by the first terminal.

[0121] For example, the application layer entity of the first terminal generates service data (ie, uplink data) and transmits the service data to the access layer of the first terminal. The service data is then transmitted to the backpack satellite base station where the first terminal is located via the uplink logical channel of the first terminal.

[0122] Step 208: Check whether the backpack satellite base station where the first terminal is located has received information that the first terminal and the second terminal are both located in a cell of the same backpack satellite base station.

[0123] After the backpack satellite base station where the first terminal is located receives the service data, if the service establishment response message carries the information that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, execute step 209; if the service establishment response message carries the information that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station or does not carry the information that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, execute steps 209'-210'.

[0124] Step 209: The backpack satellite base station where the first terminal is located sends service data to the second terminal through the second data radio bearer.

[0125] The backpack satellite base station where the first terminal is located learns that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station based on the information that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, that is, the first terminal and the second terminal are both located in the cell of the backpack satellite base station where the first terminal is located, that is, the first terminal and the second terminal both belong to the backpack satellite base station where the first terminal is located, and the backpack satellite base station where the first terminal is located determines that the data radio bearer used to transmit the service data of the first data radio bearer is the second data radio bearer based on the mapping relationship between the first data radio bearer and the second data radio bearer, and then transmits the service data to the second terminal through the second data radio bearer (for example, the downlink logical channel of the second data radio bearer), so that the service data is not sent to the backpack satellite base station where the first terminal is located without passing through the satellite and the core network, that is, it avoids the process that the backpack satellite base station where the first terminal is located needs to send the service data to the user plane network element of the core network via satellite, and then the user plane network element of the core network sends it to the backpack satellite base station where the first terminal is located via satellite, and finally the backpack satellite base station where the first terminal is located sends it to the second terminal.

[0126] In steps 209'-210', the backpack satellite base station transmits the service data to the second terminal via the satellite and the core network.

[0127] The backpack satellite base station where the first terminal is located learns that the first terminal and the second terminal are not both located in the same cell of the backpack satellite base station based on the information carried in the service establishment response message that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station, or the service establishment response message does not carry the information that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station.

[0128] For example, the first terminal is located in the cell of the backpack satellite base station where the first terminal is located, and the second terminal is not located in the cell of the backpack satellite base station where the first terminal is located but is located in the cell of other base stations, that is, the first terminal belongs to the backpack satellite base station where the first terminal is located, and the second terminal does not belong to the backpack satellite base station where the first terminal is located but belongs to other base stations, where the other base stations can be either ordinary ground base stations or another backpack satellite base station.

[0129] Since the second terminal is not located in the cell of the backpack satellite base station where the first terminal is located, no transmission pipeline is established between the backpack satellite base station where the first terminal is located and the second terminal. For example, no data wireless bearer is established. Instead, a transmission pipeline is established between the base station where the second terminal is located and the second terminal. Therefore, the backpack satellite base station where the first terminal is located needs to transmit the service data sent by the first terminal to the user-plane network element of the core network via satellite, and then the user-plane network element of the core network transmits it to the base station where the second terminal is located via satellite, and then sends it to the second terminal via the base station where the second terminal is located.

[0130] This embodiment is explained by taking the first terminal as a sending terminal and located in a backpack satellite base station, and the second terminal as a receiving terminal as an example. Similarly, in another embodiment of the present application, the first terminal may also be a receiving terminal, and the second terminal may be a sending terminal and located in a backpack satellite base station. In this case, the core network control plane network element needs to determine whether the first terminal is also located in the cell of the backpack satellite base station where the second terminal is located, that is, the core network control plane network element needs to determine whether the first terminal and the second terminal are both located in the cell of the same backpack satellite base station. The determination process is basically similar to the above description and will not be repeated here. The backpack satellite base station receives service data sent by the second terminal through the second data radio bearer. When the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, the backpack satellite base station determines that the data radio bearer used to transmit the service data of the second data radio bearer is the first data radio bearer according to the mapping relationship between the first data radio bearer and the second data radio bearer, and then transmits the service data to the first terminal through the first data radio bearer (for example, the downlink logical channel of the first data radio bearer), so that the service data is not sent to the backpack satellite base station where the second terminal is located without passing through the satellite and the core network, that is, it avoids the process that the backpack satellite base station where the second terminal is located needs to send the service data to the core network user plane network element via satellite, and then the core network user plane network element sends it to the backpack satellite base station where the second terminal is located via satellite, and finally the backpack satellite base station where the second terminal is located sends it to the first terminal.

[0131] In this embodiment, when the core network control plane network element determines that the first terminal and the second terminal are both located within the cell coverage corresponding to the same backpack satellite base station (that is, the first terminal and the second terminal belong to the same backpack satellite base station), the backpack satellite base station where the first terminal and the second terminal are located provides direct data transmission between the first terminal and the second terminal. For example, the backpack satellite base station where the first terminal and the second terminal are located sends the service data sent by the first terminal directly to the second terminal through the data wireless bearer between the backpack satellite base station and the second terminal, instead of transmitting the service data to the second terminal via the satellite-core network-satellite-the backpack satellite base station, thereby optimizing the data transmission path, reducing the data transmission of the satellite link, reducing the load of satellite communication, reducing the data transmission delay, and improving the user experience.

[0132] like Figure 3As shown, it is a schematic diagram of the structure of a communication system provided by another embodiment of the present application, and the communication system includes a backpack satellite base station 31, a first terminal 32, a second terminal 33 and a core network control plane network element 34 which are communicatively connected to each other, wherein the backpack satellite base station 31 is communicatively connected to the core network control plane network element 34 via a satellite, when the communication system is a 4G communication system, the core network control plane network element 34 is an MME, and when the communication system is a 5G communication system, the core network control plane network element 34 is an AMF.

[0133] The backpack-type satellite base station 31 may include a transceiver module 311, a processing module 312 and a storage module 313, wherein the transceiver module 311, the processing module 312 and the storage module 313 are communicatively connected to each other, for example, via a bus connection, and the backpack-type satellite base station 31 is used to implement the steps performed by the backpack-type satellite base station in the above-mentioned communication method embodiment of the backpack-type satellite base station.

[0134] Herein, the bus may be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus system may be divided into an address bus, a data bus, a control bus, etc.

[0135] The transceiver module 311 is used to receive a service request message sent by the first terminal 32 and forward it to the core network control plane network element 34 via a satellite.

[0136] The processing module 312 is used to establish a first data radio bearer between the backpack satellite base station 31 and the first terminal 32.

[0137] The transceiver module 311 is also used to receive a service establishment response message sent by the core network control plane network element 34 via the satellite, wherein when the core network control plane network element 34 determines that the first terminal 32 and the second terminal 33 are both located in the cell of the backpack satellite base station 31, the service establishment response message carries the information that the first terminal 32 and the second terminal 33 are both located in the cell of the backpack satellite base station 31; receive the service data sent by the first terminal 32 via the first data radio bearer, and send the service data to the second terminal 33 via the second data radio bearer according to the information that the first terminal 32 and the second terminal 33 are both located in the cell of the backpack satellite base station 31 and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal 33 without passing through the satellite and the core network.

[0138] The processing module 312 is also used to establish a second data radio bearer between the backpack satellite base station 31 and the second terminal 33 when the first terminal 32 and the second terminal 33 are both located in the cell of the backpack satellite base station 31, and to establish a mapping relationship between the first data radio bearer and the second data radio bearer.

[0139] The storage module 313 is configured to store a mapping relationship between the first data radio bearer and the second data radio bearer.

[0140] For example, when the core network control plane network element 34 determines that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station 31 based on the mapping relationship between the data radio bearer and the cell, the first terminal 32 and the second terminal 33 are both located in the cell of the backpack satellite base station 31, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

[0141] For example, the processing module 312 is also used to establish a first bearer between the backpack satellite base station 31 for the first terminal 32 and the core network with the core network control plane network element 34, so that the core network control plane network element 34 establishes a mapping relationship between the first pipe and the cell, wherein the first pipe includes a first data radio bearer and a first bearer, and the mapping relationship between the first data radio bearer and the cell is realized through the mapping relationship between the first pipe and the cell; the processing module 312 is also used to establish a second bearer between the backpack satellite base station 31 for the second terminal 33 and the core network with the core network control plane network element 34, so that the core network control plane network element 34 establishes a mapping relationship between the second pipe and the cell, wherein the second pipe includes a second data radio bearer and a second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through the mapping relationship between the second pipe and the cell.

[0142] For example, the mapping relationship between the first pipe and the cell is a mapping relationship between the identifier of the first pipe and the cell identifier, and the mapping relationship between the second pipe and the cell is a mapping relationship between the identifier of the second pipe and the cell identifier.

[0143] For example, the processing module 312 is also used to establish a first bearer between the backpack satellite base station 31 for the first terminal 32 and the core network, and to establish a second bearer between the backpack satellite base station 31 for the second terminal 33 and the core network with the core network control plane network element 34; the transceiver module 311 is also used to send information about the first data wireless bearer to the core network control plane network element 34 through the first bearer and to send information about the second data wireless bearer to the core network control plane network element 34 through the second bearer, so that the core network control plane network element 34 establishes a mapping relationship between the first data wireless bearer and the cell, and a mapping relationship between the second data wireless bearer and the cell.

[0144] For example, the mapping relationship between the first data radio bearer and the cell is the mapping relationship between the first data radio bearer identifier and the cell identifier, and the mapping relationship between the second data radio bearer and the cell is the mapping relationship between the second data radio bearer identifier and the cell identifier.

[0145] Among them, the functions and implementation methods of the transceiver module 311 can refer to the receiving, sending and forwarding process of the backpack satellite base station in the above communication method embodiment, and will not be repeated here.

[0146] The functions and implementation methods of the processing module 312 can refer to the processing process of the backpack satellite base station in the above communication method embodiment, and will not be repeated here.

[0147] Figure 4 The structural diagram of another communication device provided for this embodiment includes: a transceiver 410, a processor 420 and a memory 430. These components can communicate with each other through one or more communication buses / signal lines.

[0148] Understandably, Figure 4 The structure shown is for illustration only. The communication device may also include Figure 4 More or fewer components as shown, or with Figure 4 Different configurations shown. Figure 4 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0149] In an embodiment of the present application, the transceiver 410 may be a radio frequency module for receiving and sending electromagnetic waves, realizing the mutual conversion between electromagnetic waves and electrical signals, so as to communicate with a communication network or other devices. The transceiver 410 may include various existing circuit elements for performing these functions, for example, antennas, radio frequency transceivers, digital signal processors, encryption / decryption chips, subscriber identity modules (Subscriber Identity Module, SIM) cards, memories, and the like. The transceiver 410 may communicate with various networks such as the Internet, corporate intranets, wireless networks, or communicate with other devices via wireless networks. The above-mentioned wireless networks may include cellular telephone networks, wireless local area networks, or metropolitan area networks. The above-mentioned wireless networks may use various communication standards, protocols, and technologies, including but not limited to 3G communication networks, 4G communication networks, 5G communication networks, next-generation communication networks, other protocols for email, instant messaging, and short messages, and any other suitable communication protocols, and may even include those that have not yet been developed.

[0150] The processor 420 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips. The processor 420 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, such as a single-chip microcomputer, etc.

[0151] The memory 430 includes at least one type of readable storage medium, and the readable storage medium includes a non-volatile memory or a volatile memory, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc., and the RAM may include a static RAM or a dynamic RAM. In some embodiments, the memory 430 may be an internal storage unit of the communication device, such as a hard disk or a memory of the communication device. In other embodiments, the memory 430 may also be an external storage device of the communication device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, or a flash card (Flash Card), etc., equipped on the communication device. Of course, the memory 430 may also include both the internal storage unit of the communication device and its external storage device. In this embodiment, the memory 430 is generally used to store the operating system and various application software installed in the communication device, such as the program code of the communication method in the above method embodiment. In addition, the memory 430 may also be used to temporarily store various data that have been output or are to be output.

[0152] The communication device of this embodiment may be a part of a backpack-type satellite base station, for example, a chip or circuit of the backpack-type satellite base station.

[0153] The transceiver 410 is configured to receive a service request message sent by the first terminal and forward the message to a control plane network element of the core network via a satellite.

[0154] The processor 420 is configured to establish a first data radio bearer between the backpack satellite base station and the first terminal.

[0155] The transceiver 410 is also used to receive a service establishment response message sent by a core network control plane network element via a satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; receive service data sent by the first terminal via the first data radio bearer, and send service data to the second terminal via the second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network.

[0156] Processor 420 is further configured to establish a second data radio bearer between the backpack satellite base station and the second terminal, and establish a mapping relationship between the first data radio bearer and the second data radio bearer when both the first terminal and the second terminal are located in the cell of the backpack satellite base station.

[0157] The memory 430 is configured to store a mapping relationship between the first data radio bearer and the second data radio bearer.

[0158] For example, when the core network control plane network element determines, based on the mapping relationship between the data radio bearer and the cell, that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station, the first terminal and the second terminal are both located in the cell of the backpack satellite base station, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

[0159] For example, the processor 420 is also used to establish a first bearer between a backpack-type satellite base station for a first terminal and the core network with the core network control plane network element, so that the core network control plane network element establishes a mapping relationship between a first pipe and a cell, wherein the first pipe includes a first data radio bearer and a first bearer, and the mapping relationship between the first data radio bearer and the cell is realized through the mapping relationship between the first pipe and the cell; the processor 420 is also used to establish a second bearer between a backpack-type satellite base station for a second terminal and the core network with the core network control plane network element, so that the core network control plane network element establishes a mapping relationship between a second pipe and a cell, wherein the second pipe includes a second data radio bearer and a second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through the mapping relationship between the second pipe and the cell.

[0160] For example, the mapping relationship between the first pipe and the cell is a mapping relationship between the identifier of the first pipe and the cell identifier, and the mapping relationship between the second pipe and the cell is a mapping relationship between the identifier of the second pipe and the cell identifier.

[0161] For example, the processor 420 is also used to establish a first bearer between the backpack satellite base station for the first terminal and the core network, and to establish a second bearer between the backpack satellite base station for the second terminal and the core network with the core network control plane network element; the transceiver 410 is also used to send information of the first data radio bearer to the core network control plane network element through the first bearer and to send information of the second data radio bearer to the core network control plane network element through the second bearer, so that the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell, and a mapping relationship between the second data radio bearer and the cell.

[0162] For example, the mapping relationship between the first data radio bearer and the cell is the mapping relationship between the first data radio bearer identifier and the cell identifier, and the mapping relationship between the second data radio bearer and the cell is the mapping relationship between the second data radio bearer identifier and the cell identifier.

[0163] Among them, the functions and implementation methods of the transceiver 410 can refer to the receiving, sending and forwarding processes of the backpack-type satellite base station in the above communication method embodiment, and will not be repeated here.

[0164] The functions and implementation methods of the processor 420 may refer to the processing process of the backpack-type satellite base station in the above communication method embodiment, and will not be described in detail here.

[0165] Another embodiment of the present application further provides a computer-readable medium, which may be a computer-readable signal medium or a computer-readable medium. A processor in a computer reads a computer-readable program code stored in the computer-readable medium, so that the processor can execute the program in the process. Figure 2The backpack-type satellite base station specifies the functional actions in each step or the combination of steps executed in the backpack-type satellite base station; generates a device for implementing the functional actions specified in each block or the combination of blocks in the block diagram.

[0166] Computer readable media include but are not limited to electronic, magnetic, optical, electromagnetic, infrared memory or semiconductor systems, devices or apparatuses, or any suitable combination of the foregoing, the memory is used to store program codes or instructions, the program code includes computer operation instructions, and the processor is used to execute the stored in the memory. Figure 2 Program code or instructions of the communication method of an embodiment.

[0167] The definitions of the memory and the processor may refer to the description of the aforementioned communication device embodiment and will not be repeated here.

[0168] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0169] In another implementation, all or part of the functions of the communication device can be implemented by SoC technology, for example, by a chip. The chip integrates a core and an input / output interface, etc. The input / output interface can implement the functions of the above-mentioned transceiver module, such as performing processing after receiving a random access request in the form of a baseband signal, and sending a random access response in the form of a baseband signal; the core can implement the processing function. The functions of the core and the input / output interface can be implemented by hardware, or by hardware executing corresponding software. The above-mentioned hardware or software includes one or more modules corresponding to the above-mentioned functions. In another embodiment, the input / output port can also be a port connecting the chip to a circuit, device or equipment outside the chip, which is used to output the random access request generated by the chip to the circuit, device or equipment connected to it, or to receive a random access response provided by the circuit, device or equipment connected to it.

[0170] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and implementation constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0172] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0173] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0174] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0175] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The above computer program product includes one or more computer instructions. When the above computer program instructions are loaded and executed on a computer or processor, the above process or function according to the embodiment of the present invention is generated in whole or in part. The above computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a server, or other programmable device. The above computer instructions can be stored in a computer-readable storage medium or transmitted through the above computer-readable storage medium. The above computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The above computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0176] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method for a backpack-type satellite base station, characterized in that: include: The backpack satellite base station receives the service request message sent by the first terminal and forwards it to the core network control plane network element via the satellite; The backpack satellite base station establishes a first data radio bearer between the backpack satellite base station and the first terminal; The backpack satellite base station receives a service establishment response message sent by the core network control plane network element through the satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; The backpack satellite base station receives the service data sent by the first terminal through the first data radio bearer, and sends the service data to the second terminal through the second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network; Among them, when the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the second data wireless bearer is the data wireless bearer between the backpack satellite base station and the second terminal, and the mapping relationship between the first data wireless bearer and the second data wireless bearer is established by the backpack satellite base station.

2. The communication method according to claim 1, characterized in that: When the core network control plane network element determines, based on the mapping relationship between data radio bearers and cells, that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station, the first terminal and the second terminal are both located in the cell of the backpack satellite base station, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

3. The communication method according to claim 2, characterized in that: Before the backpack satellite base station receives the service establishment response message sent by the core network control plane network element through the satellite, the method further includes: The backpack satellite base station and the core network control plane network element establish a first bearer between the backpack satellite base station and the core network for the first terminal, so that the core network control plane network element establishes a mapping relationship between a first pipe and a cell, wherein the first pipe includes the first data radio bearer and the first bearer, and the mapping relationship between the first data radio bearer and the cell is realized by the mapping relationship between the first pipe and the cell; The backpack satellite base station and the core network control plane network element establish a second bearer between the backpack satellite base station and the core network for the second terminal, so that the core network control plane network element establishes a mapping relationship between a second pipe and a cell, wherein the second pipe includes the second data radio bearer and the second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through the mapping relationship between the second pipe and the cell.

4. The communication method according to claim 3, characterized in that: The mapping relationship between the first pipe and the cell is a mapping relationship between an identifier of the first pipe and a cell identifier, and the mapping relationship between the second pipe and the cell is a mapping relationship between an identifier of the second pipe and a cell identifier.

5. The communication method according to claim 2, characterized in that: Before the backpack satellite base station receives the service establishment response message sent by the core network control plane network element through the satellite, the method further includes: The backpack satellite base station and the core network control plane network element establish a first bearer between the backpack satellite base station and the core network for the first terminal and establish a second bearer between the backpack satellite base station and the core network for the second terminal; The backpack satellite base station sends information of the first data radio bearer to the core network control plane network element through the first bearer and sends information of the second data radio bearer to the core network control plane network element through the second bearer, so that the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell and a mapping relationship between the second data radio bearer and the cell.

6. The communication method according to claim 5, characterized in that: The mapping relationship between the first data radio bearer and the cell is a mapping relationship between an identifier of the first data radio bearer and a cell identifier, and the mapping relationship between the second data radio bearer and the cell is a mapping relationship between an identifier of the second data radio bearer and a cell identifier.

7. A backpack-type satellite base station, characterized in that: include: A transceiver module, a processing module and a storage module, wherein: The transceiver module is used to receive the service request message sent by the first terminal, and forward it to the core network control plane network element via the satellite; The processing module is used to establish a first data radio bearer between the backpack satellite base station and the first terminal; The transceiver module is further used to receive a service establishment response message sent by the core network control plane network element through the satellite, wherein, when the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; receive service data sent by the first terminal through the first data radio bearer, and send the service data to the second terminal through the second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network; The processing module is further configured to establish the second data radio bearer between the backpack satellite base station and the second terminal, and establish a mapping relationship between the first data radio bearer and the second data radio bearer when both the first terminal and the second terminal are located in the cell of the backpack satellite base station; The storage module is used to store a mapping relationship between the first data radio bearer and the second data radio bearer.

8. The backpack-type satellite base station according to claim 7, characterized in that: When the core network control plane network element determines, based on the mapping relationship between data radio bearers and cells, that the cell corresponding to the first data radio bearer and the cell corresponding to the second data radio bearer are both cells of the backpack satellite base station, the first terminal and the second terminal are both located in the cell of the backpack satellite base station, wherein the mapping relationship between the data radio bearer and the cell includes the mapping relationship between the first data radio bearer and the cell and the mapping relationship between the second data radio bearer and the cell.

9. The backpack-type satellite base station according to claim 8, characterized in that: The processing module is further used to establish, with the core network control plane network element, a first bearer between the backpack satellite base station for the first terminal and the core network, so that the core network control plane network element establishes a mapping relationship between a first pipe and a cell, wherein the first pipe includes the first data radio bearer and the first bearer, and the mapping relationship between the first data radio bearer and the cell is realized through a mapping relationship between the first pipe and the cell; The processing module is further used to establish a second bearer between the backpack satellite base station for the second terminal and the core network with the core network control plane network element, so that the core network control plane network element establishes a mapping relationship between a second pipe and a cell, wherein the second pipe includes the second data radio bearer and the second bearer, and the mapping relationship between the second data radio bearer and the cell is realized through the mapping relationship between the second pipe and the cell.

10. The backpack-type satellite base station according to claim 9, characterized in that: The mapping relationship between the first pipe and the cell is a mapping relationship between an identifier of the first pipe and a cell identifier, and the mapping relationship between the second pipe and the cell is a mapping relationship between an identifier of the second pipe and a cell identifier.

11. The backpack-type satellite base station according to claim 8, characterized in that: The processing module is further used to establish, with the core network control plane network element, a first bearer between the backpack satellite base station for the first terminal and the core network, and to establish a second bearer between the backpack satellite base station for the second terminal and the core network; The transceiver module is also used to send information of the first data radio bearer to the core network control plane network element through the first bearer and send information of the second data radio bearer to the core network control plane network element through the second bearer, so that the core network control plane network element establishes a mapping relationship between the first data radio bearer and the cell and a mapping relationship between the second data radio bearer and the cell.

12. The backpack-type satellite base station according to claim 11, characterized in that: The mapping relationship between the first data radio bearer and the cell is a mapping relationship between an identifier of the first data radio bearer and a cell identifier, and the mapping relationship between the second data radio bearer and the cell is a mapping relationship between an identifier of the second data radio bearer and a cell identifier.

13. A communication device, characterized in that: The device comprises: a transceiver, a processor and a memory, wherein: The transceiver is used to receive the service request message sent by the first terminal, and forward it to the core network control plane network element via the satellite; The processor is configured to establish a first data radio bearer between the backpack satellite base station and the first terminal; The transceiver is further used to receive a service establishment response message sent by the core network control plane network element through the satellite, wherein when the core network control plane network element determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the service establishment response message carries information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; receive service data sent by the first terminal through the first data radio bearer, and send the service data to the second terminal through the second data radio bearer according to the information that the first terminal and the second terminal are both located in the cell of the backpack satellite base station and the mapping relationship between the first data radio bearer and the second data radio bearer, so that the service data is sent to the second terminal without passing through the satellite and the core network; The processor is further configured to, when both the first terminal and the second terminal are located in a cell of the backpack satellite base station, establish the second data radio bearer between the backpack satellite base station and the second terminal, and establish a mapping relationship between the first data radio bearer and the second data radio bearer; The memory is used to store a mapping relationship between the first data radio bearer and the second data radio bearer.

14. A communication system, characterized in that: include: A core network control plane network element and a backpack-type satellite base station as described in any one of claims 7 to 12, wherein the core network control plane network element is communicatively connected with the backpack-type satellite base station.

15. A communication device, characterized in that: include: A memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps performed by the backpack satellite base station in the communication method according to any one of claims 1 to 6 are implemented.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps performed by the backpack satellite base station in the communication method according to any one of claims 1 to 6 are implemented.

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