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

Abstract

The embodiments of the present application provide a communication method of a backpack satellite base station, a backpack satellite base station, a device and a system. The backpack satellite base station receives business data sent by a sending terminal, and determines whether the sending terminal and the receiving terminal are both located in the cell of the backpack satellite base station according to the temporary terminal identifier of the receiving terminal. When the first terminal and the second terminal are both located in the cell of the backpack satellite base station, the backpack satellite base station directly sends the business data sent by the sending terminal to the second terminal through the data wireless bearer between the backpack satellite base station and the receiving terminal, instead of transmitting the business data to the receiving 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 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 satellite base station is connected to the satellite through wireless signals, and then connected to the ground core network through the satellite, which is equivalent to replacing the "base station-core network" transmission 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 of the backpack satellite base station, thereby reducing the load of satellite communication and the 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;

[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 a core network control plane network element, where the service establishment response message carries a second temporary terminal identifier of the second terminal;

[0010] The backpack satellite base station receives service data sent by the first terminal through the first data radio bearer, and determines whether there is a mapping relationship between the second cell wireless network temporary identifier of the second terminal and the second temporary terminal identifier according to the second temporary terminal identifier;

[0011] If the backpack satellite base station has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, the backpack satellite base station determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, and sends service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network.

[0012] In some embodiments, when the first terminal and the second terminal are both located in the cell of the backpack satellite base station, before the backpack satellite base station receives the service request message, the backpack satellite base station allocates a second cell wireless network temporary identifier to the second terminal, receives the second temporary terminal identifier sent by the second terminal, and establishes a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier.

[0013] In some embodiments, the backpack-type satellite base station establishes a second data radio bearer with the second terminal according to the second temporary terminal identifier, and establishes a mapping relationship between the second temporary terminal identifier and the second data radio bearer; before sending service data to the second terminal through the second data radio bearer, the backpack-type satellite base station determines the second data radio bearer corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

[0014] In some embodiments, the mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station and the second terminal; the backpack satellite base station determines the downlink logical channel corresponding to the second temporary terminal identifier based on the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier; the backpack satellite base station sends service data to the second terminal through the downlink logical channel.

[0015] In some embodiments, before the backpack satellite base station receives the service request message, the backpack satellite base station allocates a first cell wireless network temporary identifier to the first terminal, receives the first temporary terminal identifier sent by the first terminal, and establishes a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier; when the first terminal is a receiving terminal, the backpack satellite base station determines the existence of a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier based on the first temporary terminal identifier, and sends the service data sent by the second terminal to the first terminal through the first data wireless bearer, so that the service data sent by the second terminal is not sent to the first terminal through the satellite and the core network.

[0016] 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:

[0017] 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;

[0018] A processing module, configured to establish a first data radio bearer between the backpack satellite base station and the first terminal;

[0019] The transceiver module is further used to receive a service establishment response message sent by a core network control plane network element, the service establishment response message carrying a second temporary terminal identifier of the second terminal; and receive service data sent by the first terminal through the first data radio bearer;

[0020] The processing module is further used to determine whether the storage module has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier according to the second temporary terminal identifier; if the storage module has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, determine that both the first terminal and the second terminal are located in the cell of the backpack satellite base station;

[0021] The transceiver module is also used to send service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network.

[0022] In some embodiments, the processing module is also used to allocate a second cell wireless network temporary identifier to the second terminal before the transceiver module receives a service request message when both the first terminal and the second terminal are located in the cell of the backpack satellite base station; the transceiver module is also used to receive the second temporary terminal identifier sent by the second terminal; the processing module is also used to establish a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier.

[0023] In some embodiments, the processing module is also used to establish a second data radio bearer with the second terminal based on the second temporary terminal identifier, and establish a mapping relationship between the second temporary terminal identifier and the second data radio bearer; before the transceiver module sends service data to the second terminal through the second data radio bearer, the second data radio bearer corresponding to the second temporary terminal identifier is determined based on the mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

[0024] In some embodiments, the mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station and the second terminal; in order to send service data to the second terminal through the second data radio bearer, the processing module is also used to determine the downlink logical channel corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier; the transceiver module is also used to send service data to the second terminal through the downlink logical channel.

[0025] In some embodiments, the processing module is also used to allocate a first cell wireless network temporary identifier to the first terminal before the transceiver module receives the service request message; the transceiver module is also used to receive the first temporary terminal identifier sent by the first terminal; the processing module is also used to establish a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier; the processing module is also used to determine the existence of a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier according to the first temporary terminal identifier when the first terminal is a receiving terminal; the transceiver module is also used to send the service data sent by the second terminal to the first terminal through the first data wireless bearer, so that the service data sent by the second terminal is not sent to the first terminal through the satellite and the core network.

[0026] A third aspect of the present application provides a communication device, comprising: a transceiver, a processor, and a memory, wherein:

[0027] 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;

[0028] A processor, configured to establish a first data radio bearer between the backpack satellite base station and the first terminal;

[0029] The transceiver is further configured to receive a service establishment response message sent by a core network control plane network element, the service establishment response message carrying a second temporary terminal identifier of the second terminal; and receive service data sent by the first terminal through the first data radio bearer;

[0030] The processor is further configured to determine whether the memory has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier according to the second temporary terminal identifier; if the memory has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, determine that both the first terminal and the second terminal are located in a cell of the backpack satellite base station;

[0031] The transceiver is also used to send service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network.

[0032] The transceiver module is also used to send the service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal when the first terminal and the second terminal are both located in the cell of the backpack satellite base station, so that the service data is sent to the second terminal without passing through the satellite and the core network.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] According to the technical solution of the present application, a backpack satellite base station receives service data sent by a first terminal (i.e., a sending terminal), and determines whether there is a mapping relationship between the temporary terminal identifier of the second terminal's cell wireless network and the temporary terminal identifier of the second terminal according to the temporary terminal identifier of the second terminal (i.e., a receiving terminal). If so, it means 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 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.

[0037] 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

[0038] 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.

[0039] 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.

[0040] Figure 2 It is a flow chart of a backpack-type satellite base station communication method provided in an embodiment of the present application.

[0041] Figure 3 This is a schematic diagram of a logical channel between a terminal and a backpack-type satellite base station provided in an embodiment of the present application.

[0042] Figure 4 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 5 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 communication network includes backpack satellite base stations, satellites and core networks that communicate with each other. The communication network can be a 3G, 4G, 5G or next-generation mobile communication system. For example, the mobile communication system can 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 may be a wireless terminal, which may be a device that provides voice and / or other service data connectivity to a user, a handheld device with wireless connection function, or other processing equipment connected to a wireless modem. The wireless terminal may communicate with one or more core networks via a radio access network (RAN), and the wireless terminal may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, 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] Whether it is a terminal that enters the coverage area of ​​a backpack satellite base station for the first time, or a terminal that enters the coverage area of ​​a backpack satellite base station again after the location is updated, in order to access the backpack satellite base station, the terminal needs to first read the system message broadcast by the backpack satellite base station, obtain the information of the backpack satellite base station from the system message, and then initiate the RRC connection establishment process to the backpack satellite base station. For example, the terminal changes from the closed state to the open state (for example, the terminal is turned on), or the access layer of the terminal changes from the idle state (RRC IDLE) to the connected state (RRC connection), or the terminal undergoes a cell handover (mainly a handover of the RRC layer, for example, the tracking area update (TAU) process), the terminal initiates the 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] If the terminal (for example, the first terminal or the second terminal) saves a temporary terminal identifier assigned by a core network control plane network element, for example, the temporary terminal identifier can be a system architecture evolution (SAE) temporary mobile station identifier (S-TMSI), S-TMSI is a temporary UE identification number, which is a temporary terminal identifier assigned to the terminal by a core network control plane network element, and is used to protect the international mobile subscriber identity (IMSI) of the terminal in non-access stratum (NAS) interaction, indicating that the identifier is unique within the current operator. During the RRC connection establishment process, the terminal sends the temporary terminal identifier (for example, S-TMSI) to the backpack satellite base station through an RRC message or a medium access control control unit (MAC control element, MAC CE). For example, the RRC message can be an RRC connection setup complete request (RRC connection setup complete) message or an RRC connection reconfiguration complete (RRC connection reconfiguration complete) message.

[0070] For example, after receiving the temporary terminal identifier sent by the terminal, the backpack satellite base station establishes a mapping relationship between the cell radio network temporary identifier (C-RNTI) and the temporary terminal identifier (for example, S-TMSI) for the terminal and maintains the mapping relationship. The mapping relationships between C-RNTI and S-TMSI of different terminals are different, and the backpack satellite base station maintains the mapping relationship between C-RNTI and S-TMSI for each terminal. For example, the backpack satellite base station establishes a first C-RNTI and a first S-TMSI mapping relationship for a first terminal and maintains the mapping relationship; the backpack satellite base station establishes a second C-RNTI and a second S-TMSI mapping relationship for a second terminal and maintains the mapping relationship.

[0071] If the terminal (for example, the first terminal or the second terminal) does not store the temporary terminal identifier allocated by the core network control plane network element, the terminal needs to obtain the temporary terminal identifier from the core network.

[0072] For example, when the terminal is in the process of starting up or when the terminal enters the RRC connection state from the RRC idle state (RRC idle) or the switching process, the core network control plane network element allocates a temporary terminal identifier, such as S-TMSI, to the terminal. For example, in 4G, the S-TMSI is allocated by the MME, and in 5G, the S-TMSI is allocated by the AMF. In addition, in 5G, the temporary terminal identifier can also be called 5G-S-TMSI. For example, the core network control plane network element sends a NAS message carrying the S-TMSI to the NAS of the terminal via a satellite and a backpack satellite base station. After the NAS of the terminal receives the S-TMSI, it sends the S-TMSI to the RRC layer of the terminal. The RRC layer of the terminal then sends the S-TMSI to the backpack satellite base station via an RRC message. After receiving the RRC message, the backpack satellite base station parses it, saves the parsed S-TMSI, establishes a mapping relationship between C-RNTI and S-TMSI, and maintains the mapping relationship.

[0073] 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.

[0074] 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.

[0075] Step 105: The core network control plane network element allocates a temporary terminal identifier to the terminal.

[0076] For example, the core network control plane network element allocates different S-TMSIs to different terminals, for example, allocates a first S-TMSI to a first terminal and allocates a second S-TMSI to a second terminal.

[0077] Step 106: 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.

[0078] For example, the backpack satellite base station receives a registration success message sent by the core network control plane network element via a satellite, and the registration success message carries a temporary terminal identifier allocated by the core network control plane network element, for example, S-TMSI.

[0079] For example, a backpack-type satellite base station receives a registration success message sent by a core network control plane network element to a first terminal via a satellite, and forwards it to the first terminal, where the registration success message carries a temporary terminal identifier of the first terminal, such as a first S-TMSI. For example, a backpack-type satellite base station receives a registration success message sent by a core network control plane network element to a second terminal via a satellite, and forwards it to the second terminal, where the registration success message carries a temporary terminal identifier of the second terminal, such as a second S-TMSI.

[0080] Step 107: The backpack satellite base station receives the temporary terminal identifier sent by the terminal.

[0081] For example, after the terminal receives the registration success message sent by the core network control plane network element, it obtains the S-TMSI corresponding to the terminal from the registration success message, and sends the S-TMSI to the backpack satellite base station. For example, the S-TMSI is carried in the RRC connection setup complete message (RRC connection setup complete) or the RRC connection reconfiguration complete (RRC ConnectionReconfiguration Complete) message and sent to the backpack satellite base station through the air interface.

[0082] Step 108: The backpack satellite base station establishes a mapping relationship between a temporary cell wireless network identifier and a temporary terminal identifier for the terminal.

[0083] After receiving the temporary terminal identifiers sent by each terminal, the backpack satellite base station establishes a respective mapping relationship between the cell wireless network temporary identifier and the temporary terminal identifier for each terminal, for example, establishes a respective C-RNTI and S-TMSI mapping relationship for each terminal and maintains the mapping relationship. The C-RNTI and S-TMSI mapping relationships of different terminals are different. The backpack satellite base station maintains the C-RNTI and S-TMSI mapping relationship of each terminal. For example, the backpack satellite base station establishes a first C-RNTI and a first S-TMSI mapping relationship for the first terminal, and maintains the mapping relationship. For example, the backpack satellite base station establishes a second C-RNTI and a second S-TMSI mapping relationship for the second terminal, and maintains the mapping relationship.

[0084] In another embodiment of the present application, if the core network control plane network element receives a location area update request message sent by the terminal, the core network control plane network element determines whether the cell where the terminal is located has changed. If the cell where the terminal is located has not changed, that is, the terminal is still in the backpack satellite base station cell, the temporary terminal identifier of the terminal is not modified, for example, the S-TMSI is not modified; if the cell where the terminal is located changes, for example, the terminal is connected to the cell of another base station from the current backpack satellite base station cell, then the core network control plane network element re-allocates a new temporary terminal identifier for the terminal, for example, allocates a new S-TMSI, and sends it to the terminal via the satellite and the backpack satellite base station. The terminal then sends the new temporary terminal identifier to the base station so that the base station can establish a mapping relationship between the original cell wireless network temporary identifier and the new temporary terminal identifier.

[0085] In another embodiment of the present application, when a terminal (e.g., a first terminal or a second terminal) exits the RRC connection state from the backpack satellite base station, for example, the terminal exits the cell of the backpack satellite base station due to location update or the terminal exits the RRC connection state due to poor signal, the terminal releases the temporary cell wireless network identifier assigned to it by the backpack satellite base station. If the terminal saves a temporary terminal identifier (e.g., S-TMSI) assigned by a core network control plane network element, the terminal maintains the temporary terminal identifier assigned by the core network unchanged.

[0086] 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.

[0087] If the terminal saves the temporary terminal identifier assigned by the core network control plane network element, the RRC connection establishment completion message resent by the terminal carries the temporary terminal identifier of the terminal, and the backpack satellite base station establishes a new mapping relationship between the cell wireless network temporary identifier and the temporary terminal identifier of the terminal for the terminal, such as the mapping relationship between C-RNTI and S-TMSI.

[0088] When the terminal does not save the temporary terminal identifier of the terminal assigned by the core network control plane network element, the terminal needs to obtain the temporary terminal identifier assigned by the core network control plane network element from the core network control plane network element and send it to the backpack satellite base station; after the backpack satellite base station receives the temporary terminal identifier of the terminal sent by the terminal, it establishes a mapping relationship between a new cell wireless network temporary identifier and the temporary terminal identifier of the terminal for the terminal, such as the mapping relationship between the new C-RNTI and the S-TMSI.

[0089] like Figure 2 As shown, it is a flow chart of the communication method of the backpack-type satellite base station provided in an embodiment of the present application. The first terminal can be 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.

[0090] Step 201: A first terminal sends a service request message to a core network control plane network element via a backpack satellite base station.

[0091] The core network control plane network element can be the MME in the 4G communication system or the AMF in the 5G communication system.

[0092] For example, the first terminal sends a service request message to a backpack satellite base station, 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 of the second terminal can be a user equipment identifier (UE ID) of the second terminal, an identity identifier of the user, 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.

[0093] 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.

[0094] 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, wherein the bearer establishment message carries a bearer establishment command. For example, the bearer establishment message can be an initial context setup request message, and the initial context setup request message carries the bearer establishment command.

[0095] 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.

[0096] 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.

[0097] 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, allowing the first terminal to transmit uplink data. Among them, the first bearer includes a first signaling bearer between the backpack satellite base station where the first terminal is located and the core network control plane network element and a 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.

[0098] After the backpack satellite base station establishes the first data radio bearer with the first terminal, a mapping relationship between the first temporary terminal identifier and the first data radio bearer is established according to the stored first temporary terminal identifier of the first terminal.

[0099] The mapping relationship between the first temporary terminal identifier and the first data radio bearer may be a mapping relationship between the first temporary terminal identifier and the first data radio bearer identifier.

[0100] In another embodiment, the mapping relationship between the first temporary terminal identifier and the first data radio bearer can be a mapping relationship between the first temporary terminal identifier and the logical channel (Logical Channel, LCH) of the first data radio bearer, wherein the logical channel of the first data radio bearer includes a first uplink logical channel and a first downlink logical channel between the backpack satellite base station and the first terminal.

[0101] For example, the backpack satellite base station establishes a mapping relationship between the first S-TMIS (e.g., S-TMSI A) of the first terminal and the first data radio bearer identifier (e.g., DRB A ID) or establishes a mapping relationship between the first S-TMIS and the logical channel of the first data radio bearer, for example, the first S-TMIS is respectively mapped to the first uplink logical channel LCH A_up and the first downlink logical channel LCH A_down, for example, a mapping relationship between S-TMSI A and (LCH A_up, LCH A_down).

[0102] For example, Figure 3 As shown, it is a schematic diagram of the logical channels between the receiving terminal, the receiving terminal and the backpack satellite base station of an embodiment of the present application, the sending terminal is the first terminal, the receiving terminal is the second terminal, and the logical channel of the first data wireless bearer includes a first uplink logical channel LCH A_up and a first downlink logical channel LCH A_down. The first uplink logical channel LCH A_up is used to transmit uplink service data sent by the first terminal to the backpack satellite base station, and the first downlink logical channel LCH A_down is used to transmit downlink service data sent by the backpack satellite base station to the first terminal.

[0103] 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 a core network element.

[0104] 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 of the second terminal, for example, the second temporary terminal identifier, for example, the second S-TMSI, based on the application layer identifier of the second terminal. For example, when the application layer identifier is the second temporary terminal identifier (for example, the second S-TMSI), the core network control plane network element directly obtains the second temporary terminal identifier of the second terminal in the service request; when the application layer identifier is other identifiers, for example, when the application layer identifier is UE ID, the core network control plane network element determines the second temporary terminal identifier of the second terminal corresponding to the application layer identifier of the second terminal based on the mapping relationship between the application layer identifier of the second terminal and the second temporary terminal identifier of the second terminal and the application layer identifier of the second terminal obtained from the service request message.

[0105] The core network control plane network sends a paging request to the base station where the second terminal is located according to the second temporary terminal identifier (for example, the second S-TMSI) of the second terminal, and the paging request carries the second 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.

[0106] 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.

[0107] 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).

[0108] 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. 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.

[0109] After the base station where the second terminal is located establishes the second data radio bearer with the second terminal, a mapping relationship between the second temporary terminal identifier and the second data radio bearer is established. The mapping relationship between the second temporary terminal identifier and the second data radio bearer can be a mapping relationship between the second temporary terminal identifier and the second data radio bearer identifier.

[0110] When 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, the second data radio bearer is a data radio bearer between the second terminal and the backpack satellite base station where the first terminal is located. After the backpack satellite base station where the first terminal is located establishes the second data radio bearer with the second terminal, a mapping relationship between the second temporary terminal identifier and the second data radio bearer is established. The mapping relationship between the second temporary terminal identifier and the second data radio bearer may be a mapping relationship between the second temporary terminal identifier and the second data radio bearer identifier.

[0111] In another embodiment, the mapping relationship between the second temporary terminal identifier and the second data radio bearer can be a mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes a second uplink logical channel and a second downlink logical channel between the backpack satellite base station and the second terminal.

[0112] For example, Figure 3 As shown, the logical channels of the second data wireless bearer include a second uplink logical channel LCH B_up and a second downlink logical channel LCH B_down. The second uplink logical channel LCH B_up is used to transmit uplink service data sent by the second terminal to the backpack satellite base station, and the second downlink logical channel LCH B_down is used to transmit downlink service data sent by the backpack satellite base station to the second terminal.

[0113] For example, the backpack satellite base station where the first terminal is located establishes a mapping relationship between the second S-TMIS (for example, S-TMSIB) of the second terminal and the second data radio bearer identifier (for example, DRB B ID), or establishes a mapping relationship between the second S-TMIS and the logical channel of the second data radio bearer, for example, establishes a mapping relationship between the second S-TMIS and the second uplink logical channel LCH B_up and the second downlink logical channel LCH B_down, for example, a mapping relationship between S-TMSI B and (LCH B_up, LCH B_down).

[0114] Step 204: The backpack satellite base station where the first terminal is located receives a service establishment response message sent by the core network element.

[0115] For example, the core network control plane network element sends a service establishment response message to the backpack satellite base station where the first terminal is located via a satellite. The service establishment response message carries the temporary terminal identifier of the second terminal. For example, the temporary terminal identifier of the second terminal can be the second temporary terminal identifier S-TMSI B.

[0116] Step 205: The backpack satellite base station where the first terminal is located sends a service establishment response message to the first terminal.

[0117] Step 206: The backpack-type satellite base station where the first terminal is located receives the service data sent by the first terminal.

[0118] 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, and the service data is then transmitted to the backpack satellite base station where the first terminal is located via the uplink logical channel LCH A_up of the first terminal.

[0119] Step 207: The backpack satellite base station where the first terminal is located determines whether the first terminal and the second terminal are both located in a cell of the same backpack satellite base station.

[0120] 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.

[0121] For example, the backpack-type satellite base station where the first terminal is located is only configured with one cell. When the backpack-type satellite base station where the first terminal is located determines that the first terminal and the second terminal are both located in the same cell, the backpack-type satellite base station where the first terminal is located determines that the first terminal and the second terminal are located in the same cell of the backpack-type satellite base station.

[0122] For example, the backpack-type satellite base station where the first terminal is located is configured with multiple cells. When the backpack-type satellite base station where the first terminal is located 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 backpack-type satellite base station where the first terminal is located 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 backpack-type satellite base station where the first terminal is located 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 backpack-type satellite base station where the first terminal is located 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 backpack-type satellite base station where the first terminal is located 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 backpack-type satellite base station where the first terminal is located determines that the first terminal and the second terminal are both located in the cell of the same backpack-type satellite base station.

[0123] 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).

[0124] The backpack satellite base station where the first terminal is located queries whether there is a mapping relationship between the second cell wireless network temporary identifier of the second terminal and the second temporary terminal identifier based on the second temporary terminal identifier of the second terminal (for example, S-TMSI B carried in the service establishment response message). For example, the backpack satellite base station queries whether the backpack satellite base station saves the mapping relationship between the second C-RNTI and the second S-TMSI, such as the mapping relationship between C-RNRI B and S-TMSI B, based on the second S-TMSI of the second terminal (for example, S-TMSI B).

[0125] When the backpack satellite base station determines that there is a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier of the second terminal, it means that the backpack satellite base station has allocated the second cell wireless network temporary identifier to the second terminal, that is, the second terminal has been connected to the backpack satellite base station, then it is determined 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, and step 208 is executed.

[0126] When the backpack satellite base station determines that there is no mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier of the second terminal, it means that the backpack satellite base station has not allocated the second cell wireless network temporary identifier to the second terminal, that is, the second terminal has not accessed the backpack satellite base station, that is, 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 other base stations different from the backpack satellite base station where the first terminal is located. The backpack satellite base station determines that the first terminal and the second terminal are not located in the same cell of the backpack satellite base station, and executes steps 208'-209'.

[0127] Step 208: The backpack satellite base station sends service data to the second terminal through the second data radio bearer.

[0128] When the backpack satellite base station where the first terminal is located queries the mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier of the second terminal based on the second temporary terminal identifier of the second terminal, that is, when it is determined that the first terminal and the second terminal are both located in the cell of the same backpack satellite base station, the corresponding second data wireless bearer is found according to the mapping relationship between the second temporary terminal identifier and the second data wireless bearer, that is, the DRB B for the second terminal is found, and service data is sent to the second terminal through the second data wireless bearer, so that the service data is not sent to the backpack satellite base station where the second terminal is located (that is, the backpack satellite base station where the first terminal is located) without passing through the satellite and the core network, and then sent to the second terminal by the backpack satellite base station.

[0129] For example, the backpack satellite base station where the first terminal and the second terminal are located finds the second downlink logical channel LCH B_down according to the mapping relationship between the second S-TMIS of the second terminal and the second downlink logical channel LCH B_down, that is, the mapping relationship between S-TMSI B and (LCH B_up, LCH B_down), and then directly sends the service data to the second terminal through the second downlink logical channel LCH B_down, thereby avoiding the need for the backpack satellite base station where the first terminal and the second terminal are located 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 the service data to the backpack satellite base station where the first terminal and the second terminal are located via satellite, and finally the backpack satellite base station where the first terminal and the second terminal are located sends the service data to the second terminal, 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.

[0130] In steps 208'-209', the backpack satellite base station transmits the service data to the second terminal via the satellite and the core network.

[0131] When the backpack satellite base station cannot query the mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier of the second terminal based on the second temporary terminal identifier of the second terminal, that is, when it is determined that the first terminal and the second terminal are not both located in the cell of the same backpack satellite base station, the backpack satellite base station where the first 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 the service data to the base station where the second terminal is located via satellite, and finally the base station where the second terminal is located sends the service data to the second terminal, wherein the base station where the second terminal is located is different from the backpack satellite base station where the first terminal is located, and the base station where the second terminal is located can be an ordinary ground base station or another backpack satellite base station.

[0132] This embodiment is illustrated by taking the first terminal as a sending terminal and located in a backpack-type 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-type satellite base station. When the second terminal sends service data to the first terminal, the application layer entity of the second terminal generates the service data and transmits it to the access layer of the second terminal. The service data is then transmitted to the backpack-type satellite base station via the second uplink logical channel LCH B_up. After receiving the service data, the backpack satellite base station determines whether the backpack satellite base station has a mapping relationship between the first cell wireless network temporary identifier of the first terminal and the first temporary terminal identifier according to the first temporary terminal identifier of the first terminal. If the backpack satellite base station has a mapping relationship between the first cell wireless network temporary identifier of the first terminal and the first temporary terminal identifier, and 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 backpack satellite base station where the second terminal is located), the backpack satellite base station determines the first data radio bearer according to the mapping relationship between the first temporary terminal identifier of the first terminal and the first data radio bearer and the first temporary terminal identifier of the first terminal, and then transmits the service data to the first terminal through the first downlink logical channel LCHA_down 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, and then sent to the first terminal by the backpack satellite base station where the second terminal is located.

[0133] In this embodiment, when the backpack satellite base station determines that the first terminal and the second terminal are both located within the coverage area of ​​the cell corresponding to the backpack satellite base station (that is, the first terminal and the second terminal belong to the 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, instead of transmitting the service data to the second terminal via the satellite and the core network, 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.

[0134] like Figure 4 As 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 41, a first terminal 42, a second terminal 43 and a core network control plane network element 44 which are communicatively connected to each other, wherein the backpack satellite base station 41 is communicatively connected to the core network control plane network element 44 via a satellite, when the communication system is a 4G communication system, the core network control plane network element 44 is an MME, and when the communication system is a 5G communication system, the core network control plane network element 44 is an AMF.

[0135] The backpack-type satellite base station 41 may include a transceiver module 411, a processing module 412 and a storage module 413, wherein the transceiver module 411, the processing module 412 and the storage module 413 are communicatively connected to each other, for example, via a bus connection, and the backpack-type satellite base station 41 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.

[0136] 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.

[0137] The transceiver module 411 is used to receive a service request message sent by the first terminal 42 and forward it to the core network control plane network element 44.

[0138] The processing module 412 is configured to establish a first data radio bearer with the first terminal 42 .

[0139] The transceiver module 411 is also used to receive a service establishment response message sent by the core network control plane network element 44, the service establishment response message carries the second temporary terminal identifier of the second terminal 43; and receive service data sent by the first terminal 42 through the first data radio bearer.

[0140] The processing module 412 is further configured to determine whether the storage module 413 has a mapping relationship between the second cell wireless network temporary identifier of the second terminal 43 and the second temporary terminal identifier according to the second temporary terminal identifier of the second terminal 43;

[0141] The processing module 412 is further configured to determine that both the first terminal 42 and the second terminal 43 are located in the cell of the backpack satellite base station 41 when the storage module 413 has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier.

[0142] The transceiver module 411 is also used to send service data to the second terminal 43 through the second data wireless bearer between the backpack satellite base station 41 and the second terminal 43 when the first terminal 42 and the second terminal 43 are both located in the cell of the backpack satellite base station 41, so that the service data is not sent to the second terminal 43 through the satellite and the core network.

[0143] In some embodiments, the processing module 412 is also used to allocate a second cell wireless network temporary identifier to the second terminal 43 before the transceiver module 411 receives the service request message when both the first terminal 42 and the second terminal 43 are located in the cell of the backpack satellite base station 41. The transceiver module 411 is also used to receive the second temporary terminal identifier of the second terminal 43 sent by the second terminal 43. The processing module 412 is also used to establish a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier. The processing module 412 is also used to establish a second data radio bearer with the second terminal 43 according to the second temporary terminal identifier, and establish a mapping relationship between the second temporary terminal identifier and the second data radio bearer; before the transceiver module 411 sends service data to the second terminal 43 through the second data radio bearer, the second data radio bearer corresponding to the second temporary terminal identifier is determined according to the mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

[0144] In some embodiments, the mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station 41 and the second terminal 43.

[0145] In order to send service data to the second terminal 43 through the second data radio bearer, the processing module 412 is further used to determine the downlink logical channel corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier. The transceiver module 411 is also used to send service data to the second terminal 43 through the downlink logical channel.

[0146] In some embodiments, the processing module 412 is also used to allocate a first cell wireless network temporary identifier to the first terminal 42 before the transceiver module 411 receives the service request message; the transceiver module 411 is also used to receive the first temporary terminal identifier sent by the first terminal 42; the processing module 412 is also used to establish a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier; the processing module 412 is also used to determine, when the first terminal 42 is a receiving terminal, that there is a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier based on the first temporary terminal identifier, that is, to determine that the first terminal 42 and the second terminal 43 are both located in the cell of the backpack satellite base station 41; the transceiver module 411 is also used to send the service data sent by the second terminal 43 to the first terminal 42 through the first data wireless bearer based on the mapping relationship between the first temporary terminal identifier and the first data wireless bearer, so that the service data sent by the second terminal 43 is not sent to the first terminal 42 through the satellite and the core network.

[0147] Among them, the functions and implementation methods of the transceiver module 411 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.

[0148] The functions and implementation methods of the processing module 412 can refer to the processing process of the backpack satellite base station in the above communication method embodiment, and will not be repeated here.

[0149] Figure 5 A schematic structural diagram of another communication device provided for this embodiment includes: a transceiver 510, a processor 520 and a memory 530. These components can communicate with each other via one or more communication buses / signal lines.

[0150] Understandably, Figure 5 The structure shown is for illustration only. The communication device may also include Figure 5 More or fewer components as shown, or with Figure 5 Different configurations are shown. Figure 5 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0151] In an embodiment of the present application, the transceiver 510 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 510 may include various existing circuit elements for performing these functions, for example, an antenna, a radio frequency transceiver, a digital signal processor, an encryption / decryption chip, a subscriber identity module (SIM) card, a memory, and the like. The transceiver 510 may communicate with various networks such as the Internet, an intranet, a wireless network, or communicate with other devices through a wireless network. The above-mentioned wireless network may include a cellular telephone network, a wireless local area network, or a metropolitan area network. The above-mentioned wireless network 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.

[0152] The processor 520 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor 520 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.

[0153] The memory 530 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 530 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 530 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 530 may also include both an internal storage unit of the communication device and an external storage device thereof. In this embodiment, the memory 530 is generally used to store an 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 530 may also be used to temporarily store various data that have been output or are to be output.

[0154] 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.

[0155] The transceiver 510 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.

[0156] The processor 520 is configured to establish a first data radio bearer between the backpack satellite base station and the first terminal.

[0157] The transceiver 510 is also used to receive a service establishment response message sent by a core network control plane network element, the service establishment response message carrying a second temporary terminal identifier of the second terminal; and receive service data sent by the first terminal through the first data radio bearer.

[0158] The processor 520 is also used to determine whether the memory 530 has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier according to the second temporary terminal identifier; if the memory 530 has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, it is determined that the first terminal and the second terminal are both located in the cell of the backpack satellite base station.

[0159] The transceiver 510 is also used to send service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network.

[0160] In some embodiments, the processor 520 is also used to allocate a second cell wireless network temporary identifier to the second terminal before the transceiver 510 receives a service request message when both the first terminal and the second terminal are located in the cell of the backpack satellite base station; the transceiver 510 is also used to receive a second temporary terminal identifier sent by the second terminal; the processor 520 is also used to establish a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier.

[0161] In some embodiments, the processor 520 is also used to establish a second data radio bearer with the second terminal based on the second temporary terminal identifier, and establish a mapping relationship between the second temporary terminal identifier and the second data radio bearer; before the transceiver 510 sends service data to the second terminal through the second data radio bearer, the second data radio bearer corresponding to the second temporary terminal identifier is determined based on the mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

[0162] In some embodiments, the mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station and the second terminal; in order to send service data to the second terminal through the second data radio bearer, the processor 520 is also used to determine the downlink logical channel corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier; the transceiver 510 is also used to send service data to the second terminal through the downlink logical channel.

[0163] In some embodiments, the processor 520 is also used to allocate a first cell wireless network temporary identifier to the first terminal before the transceiver 510 receives the service request message; the transceiver 510 is also used to receive the first temporary terminal identifier sent by the first terminal; the processor 520 is also used to establish a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier; the processor 520 is also used to determine the existence of a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier according to the first temporary terminal identifier when the first terminal is a receiving terminal; the transceiver 510 is also used to send the service data sent by the second terminal to the first terminal through the first data wireless bearer, so that the service data sent by the second terminal is not sent to the first terminal through the satellite and the core network.

[0164] Among them, the functions and implementation methods of the transceiver 510 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.

[0165] The functions and implementation methods of the processor 520 may refer to the processing process of the backpack satellite base station in the above communication method embodiment, and will not be described in detail here.

[0166] 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 2 The backpack-type satellite base station specifies the functional actions in each step or combination of steps executed in the backpack-type satellite base station; generates a device for implementing the functional actions specified in each block or combination of blocks in the block diagram.

[0167] 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 2Program code or instructions of the communication method of an embodiment.

[0168] 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.

[0169] In the various embodiments of the present application, unless otherwise specified or provided in a 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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 integrated. 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)).

[0177] 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; 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, where the service establishment response message carries a second temporary terminal identifier of the second terminal; The backpack satellite base station receives the service data sent by the first terminal through the first data radio bearer, and determines whether there is a mapping relationship between the second cell wireless network temporary identifier of the second terminal and the second temporary terminal identifier according to the second temporary terminal identifier; If the backpack satellite base station has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, the backpack satellite base station determines that the first terminal and the second terminal are both located in the cell of the backpack satellite base station, and sends the service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network.

2. The communication method according to claim 1, characterized in that: When both the first terminal and the second terminal are located in the cell of the backpack satellite base station, before the backpack satellite base station receives the service request message, the method further includes: The backpack satellite base station allocates the second cell wireless network temporary identifier to the second terminal, receives the second temporary terminal identifier sent by the second terminal, and establishes a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier.

3. The communication method according to claim 2, characterized in that: The method further comprises: The backpack satellite base station establishes the second data radio bearer with the second terminal according to the second temporary terminal identifier, and establishes a mapping relationship between the second temporary terminal identifier and the second data radio bearer; Before sending the service data to the second terminal through the second data radio bearer, the method further includes: The backpack satellite base station determines the second data radio bearer corresponding to the second temporary terminal identifier according to a mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

4. The communication method according to claim 3, characterized in that: The mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and a logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station and the second terminal; The sending the service data to the second terminal through the second data radio bearer specifically includes: The backpack satellite base station determines the downlink logical channel corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier; The backpack satellite base station sends the service data to the second terminal via the downlink logical channel.

5. The communication method according to claim 1, characterized in that: Before the backpack satellite base station receives the service request message, the method further includes: The backpack satellite base station allocates a first cell wireless network temporary identifier to the first terminal, receives a first temporary terminal identifier sent by the first terminal, and establishes a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier; When the first terminal is a receiving terminal, the backpack satellite base station determines, based on the first temporary terminal identifier, that there is a mapping relationship between the first cell wireless network temporary identifier and the first temporary terminal identifier, and sends the service data sent by the second terminal to the first terminal through the first data wireless bearer, so that the service data sent by the second terminal is not sent to the first terminal through the satellite and the core network.

6. 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; 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 configured to receive a service establishment response message sent by the core network control plane network element, wherein the service establishment response message carries a second temporary terminal identifier of the second terminal; and receive service data sent by the first terminal through the first data radio bearer; The processing module is further used to determine whether the storage module has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier according to the second temporary terminal identifier; if the storage module has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, determine that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; The transceiver module is also used to send the service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal, so that the service data is sent to the second terminal without passing through the satellite and the core network.

7. The backpack-type satellite base station according to claim 6, characterized in that: The processing module is further configured to allocate the second cell wireless network temporary identifier to the second terminal before the transceiver module receives the service request message when both the first terminal and the second terminal are located in the cell of the backpack satellite base station; The transceiver module is further configured to receive the second temporary terminal identifier sent by the second terminal; The processing module is further used to establish a mapping relationship between the second cell radio network temporary identifier and the second temporary terminal identifier.

8. The backpack-type satellite base station according to claim 7, characterized in that: The processing module is further used to establish the second data radio bearer with the second terminal according to the second temporary terminal identifier, and establish a mapping relationship between the second temporary terminal identifier and the second data radio bearer; Before the transceiver module sends the service data to the second terminal through the second data radio bearer, the second data radio bearer corresponding to the second temporary terminal identifier is determined according to a mapping relationship between the second temporary terminal identifier and the second data radio bearer and the second temporary terminal identifier.

9. The backpack-type satellite base station according to claim 8, characterized in that: The mapping relationship between the second temporary terminal identifier and the second data radio bearer is a mapping relationship between the second temporary terminal identifier and a logical channel of the second data radio bearer, wherein the logical channel of the second data radio bearer includes an uplink logical channel and a downlink logical channel between the backpack satellite base station and the second terminal; To send the service data to the second terminal through the second data radio bearer, the processing module is further used to determine the downlink logical channel corresponding to the second temporary terminal identifier according to the mapping relationship between the second temporary terminal identifier and the logical channel of the second data radio bearer and the second temporary terminal identifier; The transceiver module is further used to send the service data to the second terminal through the downlink logical channel.

10. The backpack-type satellite base station according to claim 6, characterized in that: The processing module is further configured to allocate a first cell wireless network temporary identifier to the first terminal before the transceiver module receives the service request message; The transceiver module is further configured to receive a first temporary terminal identifier sent by the first terminal; The processing module is further used to establish a mapping relationship between the first cell radio network temporary identifier and the first temporary terminal identifier; The processing module is further configured to determine, when the first terminal is a receiving terminal, that there is a mapping relationship between the first cell radio network temporary identifier and the first temporary terminal identifier according to the first temporary terminal identifier; The transceiver module is further used to send the service data sent by the second terminal to the first terminal through the first data wireless bearer, so that the service data sent by the second terminal is not sent to the first terminal through the satellite and the core network.

11. 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; 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 configured to receive a service establishment response message sent by the core network control plane network element, the service establishment response message carrying a second temporary terminal identifier of the second terminal; and receive service data sent by the first terminal through the first data radio bearer; The processor is further used to determine whether the memory has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier according to the second temporary terminal identifier; if the memory has a mapping relationship between the second cell wireless network temporary identifier and the second temporary terminal identifier, determine that the first terminal and the second terminal are both located in the cell of the backpack satellite base station; The transceiver is further used to send the service data to the second terminal through a second data radio bearer between the backpack satellite base station and the second terminal, so that the service data is not sent to the second terminal through the satellite and the core network; The transceiver is also used to send the service data to the second terminal through the second data wireless bearer between the backpack satellite base station and the second terminal when the first terminal and the second terminal are both located in the cell of the backpack satellite base station, so that the service data is sent to the second terminal without passing through the satellite and the core network.

12. 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 6 to 10, wherein the core network control plane network element is communicatively connected with the backpack-type satellite base station.

13. 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 5 are implemented.

14. 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 5 are implemented.

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