Switching method of access network and communication system
By introducing automated network switching processes between user devices and ground networks, the use of measurement reports and network switching commands reduces the delay of the user device when switching to the satellite network, solving the delay problem caused by manual switching, improvement to improve User perception and network robustness.
Patent Information
- Application Number
- CN202411615502.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-01-24
AI Technical Summary
When a user terminal switches from a 5G ground network to a satellite network, it needs to manually disconnect and search for the satellite network, resulting in a large access delay and affecting user perception.
By receiving the measurement report reported by the user equipment, the ground network determines whether handover is required and sends a network switching command carrying multiple satellite network information to the user equipment. The user equipment sends a redirection request message according to this command, the ground network verifies the target network information and feeds back the RRC connection release message, and the user equipment accesses the target satellite network.
It significantly reduces the network switching delay, improves the network continuity and communication experience of user equipment during movement, and can quickly and seamlessly switch to satellite networks with wider coverage and more stable connections.
Smart Images
Figure CN119364451A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of communication technology, and in particular to a switching method for accessing a network and a communication system. Background Art
[0002] At present, when a user terminal switches and redirects from a 5G terrestrial network to a satellite network (Non Terrestrial Network, NTN), the user terminal usually manually disconnects from the 5G terrestrial network first, and then searches for satellite networks to access by freely selecting networks. However, this switching process takes several seconds to tens of seconds to search for networks, which will cause a large delay and affect user perception.
[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention
[0004] The embodiments of the present application provide a method for switching an access network and a communication system, so as to at least solve the technical problem that a large access delay occurs due to a terminal manually switching and redirecting the network, thus affecting user perception.
[0005] According to one aspect of an embodiment of the present application, a method for switching an access network is provided, comprising: receiving a measurement report reported by a user device, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by a ground network received by the user device in a ground network cell currently located; determining a size relationship between the first signal quality in the measurement report and a preset threshold value, and when the first signal quality is lower than the threshold value, sending a network switching command to the user device, wherein the network switching command carries at least network information of each of a plurality of satellite networks; receiving a redirection request message sent by the user device according to the network switching command, wherein the redirection request message carries at least target network information of a target satellite network to be accessed by the user device; verifying the target network information in the redirection request message, and when the target network information passes the verification, feeding back a corresponding RRC connection release message to the user device, wherein the user device is used to access the target satellite network according to the RRC connection release message.
[0006] Optionally, the measurement report also includes: the user equipment receives a second signal quality corresponding to second signals respectively transmitted by multiple satellite networks in the ground network cell currently located, wherein, after receiving the measurement report reported by the user equipment, the method also includes: determining the relationship between the multiple second signal qualities in the measurement report and the first signal quality, and when the multiple second signal qualities in the measurement report are not lower than the first signal quality, sending a network switching command to the user equipment, wherein the network switching command carries at least network information of the satellite network corresponding to the second signal quality that is not lower than the first signal quality.
[0007] Optionally, the network information includes: a network type, wherein sending a network switching command to a user device comprises: adding a network type of each of a plurality of satellite networks to a preset field, wherein the network type comprises at least one of the following: a geostationary orbit, a medium earth orbit, a low earth orbit; and sending a network switching command carrying at least a preset field to the user device.
[0008] Optionally, the network information also includes: network configuration information, wherein a network switching command is sent to a user device, and the method also includes: adding network configuration information of multiple satellite networks to a preset information element, wherein the network configuration information includes at least one of the following: ephemeris data, uplink synchronization timing advance, timing enhancement offset; sending a network switching command carrying at least a preset field and a preset information element to the user device.
[0009] Optionally, the RRC connection release message carries at least a redirection carrier information cell, and the redirection carrier information cell includes at least network type and frequency information of the target satellite network.
[0010] Optionally, the RRC connection release message carries at least a cell reselection priority list information element, and the cell reselection priority list information element includes at least the network type of the target satellite network, the reselection priority, and the cell parameters of each cell within the coverage of the target satellite network.
[0011] Optionally, the RRC connection release message carries at least a redirection target satellite network carrier information cell, and the redirection target satellite network carrier information cell includes network configuration information of the target satellite network.
[0012] According to another aspect of an embodiment of the present application, a communication system is also provided, including: a user device, a ground network, and multiple satellite networks, wherein the user device is used to report a measurement report to the ground network, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by a ground network received by the user device in a ground network cell currently located; the ground network is used to determine the relationship between the first signal quality in the measurement report and a preset threshold value, and when the first signal quality is lower than the threshold value, send a network switching command to the user device, wherein the network switching command carries at least network information of each of the multiple satellite networks; the user device is also used to send a redirection request message based on the network switching command, wherein the redirection request message carries at least target network information of the target satellite network to be accessed by the user device; the ground network is also used to verify the target network information in the redirection request message, and when the target network information passes the verification, feedback a corresponding RRC connection release message to the user equipment; the user equipment is also used to access the target satellite network based on the RRC connection release message.
[0013] According to another aspect of an embodiment of the present application, a computer program product is further provided. The computer program product includes a stored computer program, wherein when the computer program is executed by a processor, the above-mentioned access network switching method is implemented.
[0014] According to another aspect of an embodiment of the present application, a network device is further provided. The electronic device includes: a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the above-mentioned access network switching method through the computer program.
[0015] In the embodiment of the present application, when the user equipment switches to access the network, the ground network determines whether the user terminal needs to switch according to the measurement report reported by the user equipment, so as to automatically trigger the network switching process, and sends the network information carrying at least multiple satellite networks to the user equipment, so as to avoid the user terminal spending a lot of time searching the network when performing the network switching; at the same time, when the user equipment attempts to access the selected target satellite network, the ground network verifies the target network information by accessing the target network information sent by the user equipment, so as to ensure the correctness of the target network information, and after the verification is passed, the RRC connection release request is fed back to the user equipment, so as to avoid the time-consuming process of the user equipment disconnecting from the network, significantly reducing the network switching delay, improving the network continuity and communication experience of the user equipment during the mobile process, especially in remote areas or mobile scenarios with poor ground network signals, it can quickly and seamlessly switch to a satellite network with wider coverage and more stable connection, thereby achieving the purpose of improving user perception and enhancing network robustness and adaptability. In addition, the technical problem that the access delay is large and the user perception is affected due to the manual network switching and redirection of the terminal is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0017] Figure 1 is a schematic diagram of an optional architecture of a communication system according to an embodiment of the present application;
[0018] Figure 2 is a flow chart of an optional access network switching method according to an embodiment of the present application;
[0019] Figure 3 is a schematic diagram of the structure of an optional redirection carrier information cell according to an embodiment of the present application;
[0020] Figure 4 is a schematic diagram of the structure of an optional cell reselection priority list information element according to an embodiment of the present application;
[0021] Figure 5 It is a schematic diagram of the structure of an optional redirection target satellite network carrier information cell according to an embodiment of the present application;
[0022] Figure 6 It is a schematic diagram of the structure of an optional network device according to an embodiment of the present application. DETAILED DESCRIPTION
[0023] In order to enable those skilled in the art to better understand the solution of the present application, 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 only 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 should fall within the scope of protection of the present application.
[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0025] In addition, the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. For example, an interface is set up between this system and the relevant user or organization. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or organization.
[0026] Example 1
[0027] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, etc.
[0028] For example, the communication system 10 used in the embodiment of the present application is as follows: Figure 1 The communication system 100 includes: a user equipment 11, a ground network 12, and a plurality of satellite networks (also called non-ground networks) 1n (n is greater than or equal to 3), wherein:
[0029] The target device 110 includes but is not limited to a connection via a wired line, such as a Public Switched Telephone Networks (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or a device of another terminal device configured to receive / send communication signals; and / or an Internet of Things (IoT) device. A terminal device configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications System (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communications capabilities; PDAs that may include radiotelephones, pagers, Internet / Intranet access, Web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A terminal device may refer to an access terminal, user equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.
[0030] The above-mentioned ground network 12 at least includes ground network equipment 121 and ground core network 122. Among them, the ground network equipment 121 can be a device that communicates with the user equipment 11 (or called a communication terminal, terminal). The ground network equipment 121 can provide communication coverage for a specific geographical area and can communicate with terminal devices located in the coverage area. Optionally, the ground network device 121 can be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.; and the ground core network 122 is the core network component responsible for processing and controlling data packets in the ground communication system, which is responsible for the centralized management of network functions, including but not limited to: network access and authentication, mobility and session management, QoS management, network control and resource management, data routing and forwarding, etc.
[0031] Each of the above-mentioned satellite networks 1n at least includes satellite network equipment 1n1, satellite core network 1n2 and gateway station 1n3, wherein the satellite network equipment 1n1 may be a space station for wireless communication with user equipment 11 (or communication terminal, terminal), which is different from the ground network equipment 121 of the ground network 12, and may usually be located in the earth orbit (such as a satellite base station) or a high-altitude platform (such as a stratospheric communication platform); and the satellite core network 1n2 is a core network component responsible for processing and controlling data packets in the satellite network, and is similar in function to the ground core network 122; the gateway station 1n3 is an important ground facility in the satellite communication system, which receives signals sent back from the satellite, demodulates and converts them into a format that the ground network can understand, and converts the data of the ground network into a format suitable for satellite transmission and transmits it to the satellite. Therefore, the gateway station 1n3 plays the role of a bridge between the satellite and the ground network, and usually includes: an antenna system (including a large-aperture directional antenna), a signal processing device (including a modem, a frequency converter Upconverter / Downconverter, etc.), a network interface, and control and management equipment.
[0032] Specifically, in the above Figure 1In the system architecture shown, when the user equipment 11 switches the network to be accessed, the interaction process between the user equipment 11, the ground network 12, and the plurality of satellite networks 1n is specifically as follows:
[0033] First, the user equipment 11 reports a measurement report to the ground network 12, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by the ground network 12 and received by the user equipment 11 in the ground network cell currently located;
[0034] Next, the ground network 12 determines the relationship between the first signal quality in the measurement report and the preset threshold value, and sends a network switching command to the user equipment 11 when the first signal quality is lower than the threshold value, wherein the network switching command carries at least network information of each of the plurality of satellite networks 1n;
[0035] A redirection request message sent by the user equipment 11 according to the network switching command, wherein the redirection request message carries at least target network information of the target satellite network to be accessed by the user equipment 11;
[0036] Then, the ground network 12 verifies the target network information in the redirection request message, and if the target network information passes the verification, feeds back a corresponding RRC connection release message to the user equipment 11;
[0037] Finally, the user equipment 11 accesses the target satellite network according to the RRC connection release message.
[0038] This allows the ground network 12 to assist the user equipment 11 in switching to the satellite network 1n from the access side, avoiding the delay caused by the user equipment 11 spending a lot of time searching the network, thereby effectively improving the perception of the user equipment 11.
[0039] Furthermore, an embodiment of the present application provides an embodiment of a switching method for an access network applied to a ground network 12. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.
[0040] Figure 2 is a flow chart of an optional access network switching method according to an embodiment of the present application, such as Figure 2 As shown, the method at least includes steps S202-S208, wherein:
[0041] Step S202: receiving a measurement report reported by a user equipment.
[0042] In the technical solution provided in step S202, the ground network (such as g-NB) within the ground network sends a measurement configuration instruction to the user equipment through RRC signaling to instruct the user equipment to measure the signal quality of the current cell and / or the neighboring cell, and the measurement configuration includes parameters such as the measurement object, measurement interval, and measurement threshold; then, after receiving the measurement configuration instruction, the user equipment will receive the first signal transmitted by the ground network in the current ground network cell, and measure the first signal quality of the signal, such as RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality) or other signal quality indicators; then, the user equipment generates a measurement report based on the measurement result, and sends it to the ground network via the uplink.
[0043] Step S204: determine the relationship between the first signal quality in the measurement report and a preset threshold value, and send a network switching command to the user equipment when the first signal quality is lower than the threshold value.
[0044] In the technical solution provided in step S204, after receiving the measurement report, the ground network will parse the measurement report to obtain the first signal quality therein, and compare the first signal quality with a preset threshold value, wherein the threshold value is one or more pre-configured threshold values, used to determine whether the signal quality meets the requirements of network performance and user experience. When the first signal quality is lower than the threshold value (i.e., the condition for triggering network switching), it usually indicates that the connection quality between the network device and the current ground network cell has decreased, thereby affecting the quality of data transmission or voice calls. At this time, the ground network can send a network switching command (Mobility From NR Command) to the user equipment, wherein the network switching command carries at least the network information of multiple satellite networks to assist the user equipment in identifying and accessing the satellite network.
[0045] It should be noted that before the ground network sends a network switching command, the ground network interacts with the satellite network to obtain network information of multiple satellite networks. Since the interaction process between the ground network and the satellite network belongs to the prior art, this application does not make specific restrictions on this.
[0046] Step S206: receiving a redirection request message sent by the user equipment according to the network switching command.
[0047] In the technical solution provided in step S206, when the user equipment receives the network switching command, it can select a target satellite network with the best signal quality from multiple satellite networks to attempt to access according to its own business needs. Specifically, it can send a redirection request message carrying at least the target network information of the target satellite network to be accessed by the user equipment to the ground network, wherein the redirection request message also includes additional information such as the identification information, current status, and business needs of the user equipment, and no specific restrictions are made here.
[0048] Step S208: verify the target network information in the redirection request message, and if the target network information passes the verification, feed back a corresponding RRC connection release message to the user equipment.
[0049] In the technical solution provided in step S208, after receiving the redirection request message, the ground network will parse the redirection request message to extract the target satellite network information therein, and verify the information to ensure that the satellite network information that the user equipment attempts to access is legal and valid. If the information passes the verification, it means that the target satellite network that the user equipment attempts to access is eligible for access. At this time, the ground network will feedback the corresponding RRC connection release message to the user equipment, which usually contains an instruction to redirect to the target satellite network, which also indicates that the connection between the ground network and the user equipment will be released to allow the user equipment to switch to the target satellite network. The user equipment can then execute the subsequent network switching process to access the target satellite network.
[0050] The above method of this embodiment is further introduced below.
[0051] As an optional implementation, the measurement report also includes: the second signal quality corresponding to the second signals respectively transmitted by multiple satellite networks received by the user equipment in the ground network cell currently located, such as signal strength, ephemeris data, Doppler frequency shift, etc. Then, the ground network can determine the magnitude relationship between the multiple second signal qualities in the measurement report and the first signal quality, and send a network switching command to the user equipment when the multiple second signal qualities in the measurement report are not lower than the first signal quality, wherein the network switching command carries at least the network information of the satellite network corresponding to the second signal quality not lower than the first signal quality.
[0052] That is to say, after receiving the measurement report containing the above information, the ground network will parse the measurement report to obtain the first signal quality and multiple second signal qualities, and compare the first signal quality and the multiple second signal qualities to evaluate the connection status of the user equipment in the ground network and the satellite network. If there is one or more satellite networks whose second signal quality is not lower than or even better than the first signal quality of the ground network, then it can be considered that the user equipment switching to the satellite network will provide better connection quality or meet specific business needs to provide continuous service in areas where the ground network coverage is insufficient. At this time, the ground network can send a network switching command (i.e., Mobility From NR Command) to the user equipment, wherein the network switching command carries at least the network information of the satellite network corresponding to the second signal quality that is not lower than the first signal quality, so as to assist the user equipment in identifying and accessing the satellite network.
[0053] Considering that when the ground network feeds back a network switching command to the user equipment, the targetRAT-Type field (used to indicate the target system type) in the network switching command it usually feeds back only includes the type of the ground network and related network configuration information. In order to facilitate the user equipment to identify and access a satellite network with better signal quality, the network information of the satellite network sent by the ground network to the user equipment may include: network type.
[0054] Optionally, the ground network can add the network type of each of the multiple satellite networks to a preset field (i.e., the targetRAT-Type field), and send a network switching command carrying at least the preset field to the user equipment. The above network types include at least one of the following: geostationary orbit GEO (Geostationary Orbit, referring to a high-orbit satellite system with an altitude of 35786km), medium earth orbit MEO (Medium Earth Orbit, referring to a medium-orbit satellite system with an altitude of 8000km to 25000km), low earth orbit LEO (Low Earth Orbit, referring to a low-orbit satellite system with an altitude of less than 2000km), OTHERSAT (referring to satellite types and related systems not currently defined by 3GPP).
[0055] In addition, since satellites are far away from the earth, user devices face problems such as time extension, large frequency deviation, and long links when accessing the satellite network. Therefore, in order to facilitate user devices to access the satellite network, the satellite network network information sent by the ground network to the user equipment can also include: network configuration information.
[0056] Optionally, network configuration information of multiple satellite networks is added to a preset information element (such as mobilityFromNRcommand-v1610-IEs), and a network switching command carrying at least a preset field and a preset information element is sent to the user equipment. The network configuration information includes but is not limited to: ephemeris data (including orbital parameters, position information, running speed, acceleration, etc. of the satellite, and the effective time range of the ephemeris), uplink synchronization timing advance (used to adjust the parameters of the uplink transmission timing of the user equipment to ensure that the uplink signal of the user equipment can be correctly aligned at the satellite receiving end), timing enhancement offset (used to fine-tune the timing advance of the user equipment to ensure that the uplink signal sent by the user equipment can be accurately aligned with the satellite receiving time, reducing communication errors and delays caused by signal propagation delays). In addition, the network configuration information may also include: information related to the protocol stack layer configuration between the satellite network and the ground network, such as the extended PDCP (Packet Data Convergence Protocol) layer / RLC (Radio Link Control) layer / MAC (Medium Access Control) layer, and data radio bearer DRB (Data Radio Bearer) information (including quality of service QoS configuration, encryption and integrity protection settings, bearer identification, etc.).
[0057] It should be noted that, considering the compatibility of user equipment, the preset information element including the network configuration information of the satellite network (such as mobility From NR command-v1610-IEs) is usually set in the nonCriticalExtension subdirectory, so that user equipment that does not support NTN capabilities can ignore the information to prevent compatibility issues from causing terminal demodulation information failure.
[0058] Further, after the user equipment receives the network switching command, it can select the target satellite network with the best quality from the satellite network according to its own service requirements, and send a redirection request message carrying at least the target network information of the target satellite network to the ground network; after receiving the information, the ground network can perform verification according to the following steps to ensure that the target satellite network accessed by the user equipment is legal:
[0059] First, verify that the satellite network band and frequency are within the preset frequency plan.
[0060] Next, the satellite network identification is checked to see if it matches a known legitimate satellite network.
[0061] Then, the satellite position or service area information is confirmed to ensure that the user equipment is within the coverage of the target satellite.
[0062] It should be noted that the above verification process is only described as an example, and the specific verification process needs to be configured in combination with the network information of the actual application scenario.
[0063] Furthermore, when the ground network verifies the target network information and the result is that the verification is passed, the ground network can feed back a corresponding RRC connection release message to the user equipment.
[0064] Specifically, the RRC connection release message defined in 3GPP R17 38331 generally includes at least: target network type and frequency, target network reselection priority, and target network configuration, and the message only defines information related to the terrestrial network, but lacks information related to the satellite network. To this end, the embodiment of the present application adjusts the cell information carried in the above message as follows:
[0065] The above RRC connection release message carries at least a redirected carrier information IE (i.e., "RedirectedCarrierInfo" IE), and the redirected carrier information IE includes at least the network type and frequency information of the target satellite network, such as Figure 3 As shown, to ensure that the frequency information of the satellite network can be obtained in the signaling analysis. Among them, the frequency information refers to the specific wireless frequency or frequency band used to transmit signals in the satellite communication system, which includes: center frequency (Center Frequency), bandwidth (Bandwidth), uplink and downlink frequencies (Uplink and Downlink Frequencies), carrier spacing (Carrier Spacing), frequency offset (Frequency Offset), frequency allocation and planning information, frequency tuning information, etc.
[0066] The above RRC connection release message carries at least a cell reselection priority list information element (i.e., "CellReselectionPriorities" IE), and the cell reselection priority list information element includes at least the network type of the target satellite network, the reselection priority, and the cell parameters of each cell within the coverage of the target satellite network, such as Figure 4 As shown, it is ensured that the reselection priority information for the satellite network can be obtained during signaling analysis.
[0067] The above RRC connection release message carries at least the redirected target satellite network carrier information (RedirectedCarrierInfo-NTN-GEO, RedirectedCarrierInfo-NTN-MEO, RedirectedCarrierInfo-NTN-LEO, RedirectedCarrierInfo-NTN-OTHERSAT), and the redirected target satellite network carrier information includes the network configuration information of the target satellite network, such as Figure 5 shown.
[0068] Based on the scheme defined in the above steps S202 to S208, it can be learned that in the embodiment, when the user equipment switches to access the network, the ground network determines whether the user terminal needs to switch according to the measurement report reported by the user equipment, so as to automatically trigger the network switching process, and sends to the user equipment at least network information of multiple satellite networks, so as to avoid the user terminal needing to spend a lot of time searching the network when performing network switching; at the same time, when the user equipment attempts to access the selected target satellite network, the ground network verifies the target network information when it accesses the target network information sent by the user equipment at least carrying the target satellite network to be accessed, so as to ensure the correctness of the target network information, and after the verification is passed, feeds back an RRC connection release request to the user equipment, so as to avoid the time-consuming process of the user equipment disconnecting from the network, significantly reducing the network switching delay, improving the network continuity and communication experience of the user equipment during the movement, especially in remote areas or mobile scenarios where the ground network signal is poor, it can quickly and seamlessly switch to a satellite network with wider coverage and more stable connection, thereby achieving the purpose of improving user perception and enhancing network robustness and adaptability.
[0069] Example 2
[0070] According to an embodiment of the present application, a network device is also provided, wherein: Figure 6 is a schematic diagram of the structure of an optional network device according to an embodiment of the present application, such as Figure 6 As shown, the network device includes one or more processors; a memory for storing one or more programs, which, when the one or more programs are executed by the one or more processors, enables the one or more processors to run the programs, wherein the programs are configured to execute the access network switching method in the above-mentioned embodiment 1 when running.
[0071] Optionally, the processor is configured to execute the following steps through a computer program: receiving a measurement report reported by a user device, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by a ground network received by the user device in a ground network cell currently located; determining a relationship between the first signal quality in the measurement report and a preset threshold value, and when the first signal quality is lower than the threshold value, sending a network switching command to the user device, wherein the network switching command carries at least network information of each of a plurality of satellite networks; receiving a redirection request message sent by the user device according to the network switching command, wherein the redirection request message carries at least target network information of a target satellite network to be accessed by the user device; verifying the target network information in the redirection request message, and when the target network information passes the verification, feeding back a corresponding RRC connection release message to the user device, wherein the user device is used to access the target satellite network according to the RRC connection release message.
[0072] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.
[0073] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.
[0074] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, 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 units or modules, which can be electrical or other forms.
[0075] The units described 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 over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.
[0076] 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. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.
[0077] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the relevant technology or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.
[0078] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A method for switching an access network, characterized in that: include: Receiving a measurement report reported by a user equipment, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by a terrestrial network received by the user equipment in a terrestrial network cell currently located; determining a relationship between a first signal quality in the measurement report and a preset threshold value, and sending a network switching command to the user equipment when the first signal quality is lower than the threshold value, wherein the network switching command carries at least network information of each of a plurality of satellite networks; receiving a redirection request message sent by the user equipment according to the network switching command, wherein the redirection request message carries at least target network information of a target satellite network to be accessed by the user equipment; The target network information in the redirection request message is verified, and when the target network information passes the verification, a corresponding wireless data control RRC connection release message is fed back to the user equipment, wherein the user equipment is used to access the target satellite network according to the RRC connection release message.
2. The method according to claim 1, characterized in that The measurement report also includes: the user equipment receives, in the terrestrial network cell currently located, second signal qualities corresponding to second signals respectively transmitted by the plurality of satellite networks, wherein after receiving the measurement report reported by the user equipment, the method further includes: Determine the relationship between the multiple second signal qualities in the measurement report and the first signal quality, and when the multiple second signal qualities in the measurement report are not lower than the first signal quality, send a network switching command to the user equipment, wherein the network switching command carries at least network information of the satellite network corresponding to the second signal quality that is not lower than the first signal quality.
3. The method according to claim 1, characterized in that The network information includes: a network type, wherein sending a network switching command to the user equipment includes: Adding the network type of each of the plurality of satellite networks into a preset field, wherein the network type includes at least one of the following: geostationary orbit, medium earth orbit, and low earth orbit; Sending a network switching command carrying at least the preset field to the user equipment.
4. The method according to claim 3, characterized in that The network information also includes: network configuration information, wherein a network switching command is sent to the user equipment, and the method further includes: Adding network configuration information of the plurality of satellite networks to a preset information element, wherein the network configuration information includes at least one of the following: ephemeris data, uplink synchronization timing advance, and timing enhancement offset; Sending a network switching command carrying at least the preset field and the preset information element to the user equipment.
5. The method according to claim 1, characterized in that The RRC connection release message carries at least a redirection carrier information cell, and the redirection carrier information cell includes at least the network type and frequency information of the target satellite network.
6. The method according to claim 1, characterized in that The RRC connection release message carries at least a cell reselection priority list information element, and the cell reselection priority list information element includes at least the network type of the target satellite network, the reselection priority, and the cell parameters of each cell within the coverage of the target satellite network.
7. The method according to claim 1, characterized in that The RRC connection release message carries at least a redirection target satellite network carrier information cell, and the redirection target satellite network carrier information cell includes network configuration information of the target satellite network.
8. A communication system, characterized in that: The communication system includes: user equipment, a ground network, and multiple satellite networks, wherein: The user equipment is configured to report a measurement report to the ground network, wherein the measurement report at least includes: a first signal quality corresponding to a first signal transmitted by the ground network and received by the user equipment in a ground network cell currently located; The terrestrial network is configured to determine a relationship between a first signal quality in the measurement report and a preset threshold value, and when the first signal quality is lower than the threshold value, send a network switching command to the user equipment, wherein the network switching command carries at least network information of each of the multiple satellite networks; The user equipment is further configured to send a redirection request message according to the network switching command, wherein the redirection request message carries at least target network information of a target satellite network to be accessed by the user equipment; The terrestrial network is further used to verify the target network information in the redirection request message, and if the target network information passes the verification, feed back a corresponding RRC connection release message to the user equipment; The user equipment is further configured to access the target satellite network according to the RRC connection release message.
9. A computer program product, characterized in that include: A computer program, wherein when the computer program is executed by a processor, the access network switching method described in any one of claims 1 to 7 is implemented.
10. A network device, characterized in that: include: A memory and a processor, wherein the processor is used to run a program stored in the memory, wherein the program executes the access network switching method described in any one of claims 1 to 7 when running.