A cell reselection method, device, apparatus and computer readable storage medium

Abstract

The disclosure discloses a cell reselection method, device, equipment and computer readable storage medium. The cell reselection method is applied to a mobile terminal and includes: starting a cell reselection process, selecting a target cell from a serving cell where the mobile terminal is currently located and neighboring cells of the serving cell according to a set reselection condition; if a target tracking area identifier of the target cell is inconsistent with a current tracking area identifier of the serving cell, delaying reselection and monitoring the target cell when a signal parameter of the serving cell does not satisfy a set threshold condition, until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, reselecting to the target cell, and completing the reselection process. Through implementation of the disclosure, the number of TA changes of the mobile terminal in an idle state is reduced, and the power consumption of the mobile terminal in the idle state is reduced.

Description

Technical Field

[0001] This disclosure generally relates to the field of communication technology. More specifically, this disclosure relates to a cell reselection method, apparatus, device, and computer-readable storage medium. Background Technology

[0002] NTN (Non-Terrestrial Network Terminal) mobile terminals (hereinafter referred to as mobile terminals) are user equipment that communicates via satellite networks. The satellites providing communication services can be categorized by orbit into geostationary orbit (GEO), low Earth orbit (LEO), and medium Earth orbit (MEO). A tracking area (TA) is a specific geographical area within a satellite communication network designated for location management and communication services for mobile terminals. For LEO and MEO, satellites will pass through different TAs as they move in orbit, providing communication services to mobile terminals within those TAs.

[0003] A Tracking Area (TA) typically includes multiple NTN cells (hereinafter referred to as cells). To achieve better communication quality, mobile terminals usually perform cell reselection among these cells to select the one with the best communication quality. When a mobile terminal reselects a cell belonging to a different TA, the network needs to initiate a TA update to maintain uninterrupted communication. This involves updating the Tracking Area Code (TAC) of the current cell to the network. During this process, the mobile terminal initiates signaling communication with the network, which inevitably increases power consumption. Therefore, to reduce power consumption, it is important to avoid mobile terminals reselecting cells with different TAs when idle.

[0004] In view of this, there is an urgent need to provide a cell reselection method, apparatus, device, and computer-readable storage medium solution to reduce the number of TA changes of mobile terminals in the idle state and reduce the power consumption of mobile terminals in the idle state. Summary of the Invention

[0005] In order to at least address one or more of the technical problems mentioned above, this disclosure provides a cell reselection method, apparatus, device, and computer-readable storage medium in several aspects.

[0006] In a first aspect, this disclosure provides a cell reselection method applied to a mobile terminal, comprising: initiating a cell reselection process; selecting a target cell from the serving cell currently in which the mobile terminal is located and neighboring cells of the serving cell according to preset reselection conditions; if the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell, then when the signal parameters of the serving cell do not meet the preset threshold conditions, delaying the reselection and monitoring the target cell until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, and then reselecting to the target cell to complete the reselection process.

[0007] In some embodiments, selecting a target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to a set reselection condition includes: performing signal quality measurements on the serving cell and the neighboring cells in an idle state; and selecting the target cell from the neighboring cells and the serving cell according to the set reselection condition.

[0008] In some embodiments, if the target tracking region identifier of the target cell is inconsistent with the current tracking region identifier of the serving cell, the target cell is added to the created candidate target cell list to improve the reselection priority of the target cell; the target tracking region identifier of the target cell is obtained by the following steps: reading the system message of the target cell; reading the target tracking region identifier of the target cell from the system message of the target cell.

[0009] In some embodiments, the signal parameters include at least one of reference signal received power, signal-to-noise ratio, and reference signal received quality, and the set threshold condition includes at least one of the following: the reference signal received power is less than or equal to a preset reference signal received power threshold; the signal-to-noise ratio is less than or equal to a preset signal-to-noise ratio threshold; and the reference signal received quality is less than or equal to a preset reference signal received quality threshold.

[0010] In some embodiments, the method further includes: determining the current network requirements of the mobile terminal; and determining the preset reference signal received power threshold, the preset signal-to-noise ratio threshold, or the preset reference signal received quality threshold based on the current network requirements.

[0011] In some embodiments, the method further includes: obtaining the historical change frequency of the tracking area identifier of the target cell; if the historical change frequency is greater than or equal to a set handover frequency, delaying the reselection and monitoring the target cell.

[0012] In some embodiments, when the signal parameters of the serving cell meet a set threshold condition and the mobile terminal is in a set state, the method further includes: initiating a satellite handover request to switch the satellite providing communication services to the mobile terminal from the current satellite to the target satellite.

[0013] In some embodiments, before executing the cell reselection initiation procedure, the method further includes: determining the network type currently used by the mobile terminal; if the network type is a cellular network, then executing the cell reselection initiation procedure; if the network type is a WiFi network, then not executing the cell reselection initiation procedure.

[0014] In some embodiments, the method further includes: if the target tracking area identifier is consistent with the current tracking area identifier of the serving cell, then reselecting to the target cell to complete the reselection process.

[0015] In some embodiments, when the signal parameters of the serving cell meet a set threshold condition, the cell is reselected to the target cell to complete the reselection process.

[0016] In a second aspect, this disclosure provides a cell reselection apparatus applied to a mobile terminal, comprising: a reselection initiation module, configured to initiate a cell reselection process and select a target cell from the serving cell currently in which the mobile terminal is located and the neighboring cells of the serving cell according to a set reselection condition; and a reselection module, configured to delay reselection and monitor the target cell if the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell, and if the signal parameters of the serving cell do not meet a set threshold condition, until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, and then reselect to the target cell to complete the reselection process.

[0017] In a third aspect, this disclosure provides a cell reselection device, comprising: a processor; and a memory storing program instructions that, when executed by the processor, implement the method according to the first aspect or any optional embodiment of the first aspect.

[0018] In a fourth aspect, this disclosure provides a computer-readable storage medium storing computer program instructions that, when executed by a processor, implement the method according to the first aspect or any optional embodiment of the first aspect.

[0019] Using the cell reselection method, apparatus, device, and computer-readable storage medium provided above, in this embodiment of the present disclosure, when a mobile terminal selects a cell in a different tracking area, cell reselection is temporarily suspended until the mobile terminal's current serving cell and the target cell to be reselected are in the same tracking area, in order to reduce the number of TA changes of the mobile terminal and reduce the power consumption of the mobile terminal; furthermore, the target cell is continuously monitored during the delayed reselection period, and adjacent cells are not measured again, reducing the power consumption caused by cell measurement. Attached Figure Description

[0020] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0021] Figure 1 This disclosure illustrates example diagrams showing the relationship between satellites and different geographical regions on the ground at different times, representing some embodiments of this disclosure.

[0022] Figure 2 An exemplary flowchart of a cell reselection method according to some embodiments of this disclosure is shown;

[0023] Figure 3 An overall exemplary flowchart of a cell reselection method according to some embodiments of this disclosure is shown;

[0024] Figure 4A Example diagrams illustrating cell reselection using conventional cell reselection methods, representing some embodiments of this disclosure;

[0025] Figure 4B The diagram illustrates example diagrams showing the application of the cell reselection method of this disclosure to cell reselection according to some embodiments of this disclosure;

[0026] Figure 5 An exemplary structural block diagram of a cell reselection apparatus according to some embodiments of this disclosure is shown;

[0027] Figure 6 An exemplary structural block diagram of a cell reselection device according to some embodiments of this disclosure is shown. Detailed Implementation

[0028] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0029] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0031] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0032] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0033] Exemplary application scenarios

[0034] Figure 1 The diagram shows an example of the relationship between a satellite and different geographical regions on the ground at different times.

[0035] like Figure 1As shown, satellite #1 moves continuously in its orbit, and its signal coverage area (i.e., cell) changes accordingly. Furthermore, its tracking area also changes as satellite #1 moves. For example, at 10:00:00, the tracking area for satellite #1 is geographic region #1, with a tracking area identifier of TAC#1. At 10:15:00, the tracking area shifts from geographic region #1 to geographic region #2, and the tracking area identifier changes from TAC#1 to TAC#2. At 10:30:00, the tracking area shifts from geographic region #2 to geographic region #3, and the tracking area identifier changes from TAC#2 to TAC#3. During satellite movement, mobile terminals initiate cell reselection procedures to maintain good communication.

[0036] In this disclosed embodiment, the core purpose of the above-mentioned cell reselection process is to select the most suitable target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell, based on specific reselection conditions, so as to ensure that the mobile terminal can select the most suitable cell for communication during the movement, and to ensure communication quality and continuity.

[0037] However, based on the above description, when a mobile terminal reselects a cell belonging to a different Tracking Area Code (TA), in order to maintain uninterrupted communication, the network needs to initiate a TA update, that is, update the Tracking Area Code (TAC) of the current cell to the network. During this process, the mobile terminal will initiate signaling to connect and interact with the network, which inevitably increases power consumption. Therefore, to reduce power consumption, it is necessary to avoid the mobile terminal reselecting a cell to a different TA when it is idle.

[0038] In view of this, the present disclosure provides a cell reselection method to reduce the number of TA changes of a mobile terminal in an idle state and reduce the power consumption of the mobile terminal in an idle state.

[0039] Figure 2 An exemplary flowchart of a cell reselection method 200 according to some embodiments of this disclosure is shown. It is understood that the cell reselection method 200 can be executed by the aforementioned mobile terminal. Here, a mobile terminal refers to a device capable of communication via satellite, which may be, for example, a communication device installed on a vehicle, aircraft, ship, or other means of transportation, or a handheld satellite communication device.

[0040] like Figure 2As shown, the cell reselection method 200 includes: Step S210: Initiating the cell reselection process, selecting a target cell from the serving cell where the mobile terminal is currently located and its neighboring cells according to the set reselection conditions; Step S220: If the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell, then when the signal parameters of the serving cell do not meet the set threshold conditions, the reselection is delayed and the target cell is monitored until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, and then the target cell is reselected to complete the reselection process.

[0041] For example, in this disclosed embodiment, cell reselection refers to a set of operation procedures performed by a mobile terminal to optimize communication performance. During communication, due to factors such as satellite movement and signal blockage, the signal quality of the serving cell where the mobile terminal is currently located deteriorates. At this time, the mobile terminal needs to reselect a cell with better communication quality (i.e., the target cell) to maintain communication, that is, to start the cell reselection process.

[0042] In this disclosed embodiment, the cell reselection process is usually triggered by the communication management module deployed inside the mobile terminal. As for the triggering time, it can be that the mobile terminal checks its current communication status every once in a while and decides whether to start the process again, or it can be that the cell reselection process is restarted immediately when the signal quality of the currently serving cell deteriorates to a certain extent. This disclosed embodiment does not specifically limit the triggering time of the cell reselection process.

[0043] As an optional embodiment of this disclosure, before executing the cell reselection initiation procedure, the network type currently used by the mobile terminal can be obtained first, and a decision can be made based on the currently used network type to determine whether to execute the cell reselection initiation procedure. Specifically: determine the network type currently used by the mobile terminal; if the network type is a cellular network, then execute the cell reselection initiation procedure; if the network type is a WiFi network, then do not execute the cell reselection initiation procedure.

[0044] In this disclosed embodiment, the network type currently used by the mobile terminal refers to the type of network the mobile terminal is currently connected to, which may include: cellular networks (such as 4G and 5G networks) and WiFi networks (networks based on wireless local area network technology). In specific embodiments, the mobile terminal can determine its current network type through various methods, for example, through a network detection application. This disclosed embodiment does not specifically limit this method.

[0045] In this disclosed embodiment, if the mobile terminal is currently using a cellular network, the cell reselection process is initiated in accordance with the relevant rules and mechanisms of the cellular network; if the mobile terminal is currently using a WiFi network, the current network connection status is maintained and the cell reselection process is not initiated, further reducing the number of TA changes for the mobile terminal and reducing the power consumption of the mobile terminal in the idle state.

[0046] For example, in this disclosed embodiment, the setting of reselection conditions in step S210 involves extracting a series of pre-defined rules to determine which cell in the non-terrestrial network (NTN) is more suitable as the target cell for reselection. The aforementioned setting of reselection conditions may include various factors such as cell signal strength, cell signal quality, and cell load. As a specific embodiment of this disclosure, the setting of reselection conditions may be that the cell's signal strength is greater than a set strength threshold and the cell's signal quality is higher than a set quality threshold.

[0047] In this disclosed embodiment, the serving cell refers to the cell currently providing communication services to the mobile terminal. The mobile terminal receives signals from the base station of the serving cell within the coverage area of ​​that cell and sends communication data to it. In this disclosed embodiment, neighboring cells of the serving cell refer to cells geographically adjacent to the serving cell. These cells may belong to the same tracking area (TA) or different tracking areas. In this embodiment, the serving cell and its neighboring cells together constitute the set of cells from which the mobile terminal can reselect. The target cell refers to the cell most suitable for communication selected by the mobile terminal from the serving cell and its neighboring cells by setting reselection conditions.

[0048] As for how to specifically select target cells, the following examples illustrate this, and will not be elaborated upon here.

[0049] For example, in this disclosed embodiment, the target tracking area identifier refers to the unique code of the tracking area to which the target cell belongs. It is understood that a tracking area refers to a way of dividing satellite coverage, and cells within each tracking area may share certain commonalities, such as communication management strategies, signal parameter characteristics, etc. Similar to the target tracking area identifier, the current tracking area identifier is used to identify the tracking area to which the serving cell belongs. Using the target tracking area identifier and the current tracking area identifier, the mobile terminal can determine whether the target cell and the serving cell belong to the same tracking area. The methods for obtaining the target tracking area identifier and the current tracking area identifier are described in the following embodiments and will not be repeated here.

[0050] In this disclosed embodiment, if the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, it indicates that the target cell and the serving cell belong to the same tracking area. In this case, the mobile terminal can directly reselect to the target cell, that is, the mobile terminal switches its communication service from the serving cell to the target cell. At this time, the mobile terminal will obtain communication in the target cell, thus completing the reselection process. If the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell, it is further determined whether the signal parameters of the serving cell meet the set threshold conditions. The signal parameters here may include at least one of the following: reference signal received power, signal-to-noise ratio, and reference signal received quality. Based on this, the above-mentioned set threshold conditions include at least one of the following: reference signal received power is less than or equal to a preset reference signal received power threshold; signal-to-noise ratio is less than or equal to a preset signal-to-noise ratio threshold; and reference signal received quality is less than or equal to a preset reference signal received quality threshold.

[0051] The reference signal received power refers to the power of the reference signal received by the mobile terminal from the serving cell. The reference signal received power reflects the signal strength and is directly proportional to it. The preset reference signal received power threshold is a standard value determined in advance based on actual communication needs and experience. When the reference signal received power of the mobile terminal is less than or equal to this threshold, it indicates that the signal strength of the serving cell may be insufficient, and cell reselection may need to be considered.

[0052] Signal-to-noise ratio (SNR) is the ratio of signal power to noise power, used to measure the degree of noise interference during signal transmission. A higher SNR indicates better signal quality. A preset SNR threshold is a standard value for SNR pre-set based on actual communication needs and experience. When the SNR measured by the mobile terminal is less than or equal to this threshold, it indicates that the serving cell's signal is significantly affected by noise, potentially impacting communication quality and necessitating consideration of cell reselection.

[0053] Reference signal reception quality (RSH) is a parameter that comprehensively measures the quality of the reference signal received by a mobile terminal. It takes into account multiple characteristics of the signal, such as bit error rate and phase noise. A higher RSH indicates a more stable signal and better communication quality. The preset RSH is a standard value for RSH that is pre-set based on actual communication needs and experience. When the RSH measured by the mobile terminal is less than or equal to this threshold, it indicates that the signal quality of the serving cell may be poor, and cell reselection may be necessary.

[0054] When the signal parameters of the serving cell meet the set threshold conditions, it indicates that the signal quality of the serving cell is poor. To prevent network drop, the mobile terminal reselects to the target cell, completing the reselection process. When the signal parameters of the serving cell do not meet the set threshold conditions, it indicates that the signal quality of the serving cell is good and can meet the current usage needs of the mobile terminal. Cell reselection is not performed temporarily, and other neighboring cells are not measured. Instead, the target cell is continuously monitored until the target tracking area identifier of the target cell matches the current tracking area identifier of the serving cell. Then, the cell reselection is performed again, i.e., reselecting to the target cell, completing the reselection process. During the waiting period without cell reselection, the mobile terminal continues to monitor the target tracking area identifier of the target cell and the parameter changes of the serving cell.

[0055] As an optional embodiment of this disclosure, the aforementioned preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold can be dynamically determined according to the current network requirements of the mobile terminal. Specifically: determine the current network requirements of the mobile terminal; determine the preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold based on the current network requirements.

[0056] For example, in this disclosed embodiment, network requirements refer to the requirements of a mobile terminal on network performance, quality of service, etc., when performing various network-related operations. In this disclosed embodiment, there are many methods for determining the current network requirements of a mobile terminal. For example, it can be determined by the type of currently running application, or by combining the currently running application with the user's usage habits of the current application. This disclosed embodiment does not specifically limit these methods.

[0057] As one specific implementation of this disclosure, a mobile terminal can determine its current network requirements based on the type of application currently running on the mobile terminal. For example, playing high-definition video requires a network with a high data transmission rate and low latency; while browsing ordinary web pages requires relatively lower network speeds.

[0058] As another specific implementation of this disclosure, the mobile terminal can determine its current network requirements based on the currently running application and the user's usage habits of that application. For example, if the currently running application is video software A, and the user typically browses video software A for more than an hour, a high data transmission rate and low latency are required. Conversely, if the currently running application is reading software B, and the user typically browses reading software B for 10 minutes, the network requirements are relatively lower.

[0059] In this disclosed embodiment, determining the preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold based on current network requirements can be as follows: when current network requirements are high, the mobile terminal needs a higher data transmission rate and stability, so the preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold can be set to a higher value; when current network requirements are low, the preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold can be set to a lower value.

[0060] As a specific implementation of this disclosure, the correspondence between various network requirements and preset reference signal received power threshold, preset signal-to-noise ratio threshold and preset reference signal received quality threshold can be preset in advance. After obtaining the current network requirements of the mobile terminal, the preset reference signal received power threshold, preset signal-to-noise ratio threshold and preset reference signal received quality threshold that match the current network requirements are matched based on the obtained current network requirements.

[0061] In this disclosed embodiment, when a mobile terminal performs cell reselection, if a cell in a different tracking area is selected, cell reselection is temporarily suspended until the mobile terminal's current serving cell and the reselected target cell are in the same tracking area. This reduces the number of TA changes for the mobile terminal and lowers its power consumption. Furthermore, during the delayed reselection period, the target cell is continuously monitored, and adjacent cells are not measured again, reducing power consumption caused by frequent cell measurements.

[0062] As an optional embodiment of this disclosure, the step S210 above, which selects a target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to the set reselection conditions, includes: in the idle state, performing signal quality measurement on the serving cell and the neighboring cells; and selecting a target cell from the neighboring cells and the serving cell according to the set reselection conditions.

[0063] For example, in this disclosed embodiment, the above-mentioned idle state refers to a working state of the mobile terminal. When the mobile terminal does not have any ongoing data transmission operations (e.g., making a call, downloading a file, uploading a file, etc.), it is in an idle state.

[0064] In this disclosed embodiment, in actual operation, after restarting the cell reselection process, the mobile terminal can measure parameters such as the strength, stability, and anti-interference capability of the reflectable signals of the serving cell and its neighboring cells (e.g., reference signal received power, signal-to-noise ratio, reference signal received quality, etc.) in the idle state. Specifically, the mobile terminal collects and analyzes the signals sent by the serving cell and its neighboring cells through its own signal receiving module.

[0065] After completing signal quality measurements, the mobile terminal can compare the signal quality parameters of each cell with the set reselection criteria. For example, if the set reselection criteria are that the reference signal received power is greater than a certain value and the signal-to-noise ratio is greater than another value, then the mobile terminal will check the relevant parameters of neighboring cells and serving cells one by one. Only cells that meet these conditions will be considered as candidate target cells. Then, among all candidate target cells, the mobile terminal may finally determine a target cell based on further priority rules (such as best signal quality, closest distance, etc.).

[0066] As an optional embodiment of this disclosure, if the target tracking region identifier of the target cell is inconsistent with the current tracking region identifier of the serving cell, the target cell is added to the list of created candidate target cells to improve the reselection priority of the target cell.

[0067] For example, the aforementioned candidate target cell list refers to a data list created by the mobile terminal for easy management and filtering of target cells. During cell reselection, the mobile terminal adds cells that meet certain conditions (e.g., the target tracking area identifier is inconsistent with the current tracking area identifier) ​​to the candidate target cell list to increase the reselection priority of these cells. When the mobile terminal reselects cells subsequently, it can prioritize cells from the candidate target cell list. For example, during delayed reselection, the tracking identifier of the target cell in the candidate target cell list can be directly read.

[0068] Adding the target cell to the list of created candidate target cells can refer to adding the target cell's cell identifier, target tracking area identifier, etc., to the list of candidate target cells.

[0069] As an optional embodiment of this disclosure, the target tracking area identifier of the target cell is obtained by the following steps: reading the system message of the target cell; reading the target tracking area identifier of the target cell from the system message of the target cell.

[0070] For example, a system message refers to a set of information periodically broadcast by the base station of the target cell to mobile terminals within its coverage area. This information may include various parameters and configuration information of the cell, such as cell identifier, tracking area identifier, signal parameter settings, communication protocol version, etc. In this disclosed embodiment, the mobile terminal can receive the system messages sent by the target cell base station through its signal receiving module, and parse and extract the information to read the aforementioned information.

[0071] In this disclosed embodiment, after reading the system message of the target cell, the mobile terminal further reads the target tracking region identifier of the target cell from the numerous pieces of information contained in the system message. Specifically, the mobile terminal can accurately identify the location of the target tracking region identifier according to the format and structure of the system message, and then extract the target tracking region identifier.

[0072] It should be noted that the method for obtaining the current tracking region identifier is the same as the method for obtaining the target tracking region identifier, and will not be repeated here.

[0073] In this disclosed embodiment, while reading the system messages of the target cell, ephemeris messages can also be obtained to acquire richer information and assist in cell reselection. Here, ephemeris messages refer to a set of parameters describing the precise orbital position and time of a satellite.

[0074] As an optional embodiment of this disclosure, whether the tracking area identifier of the target cell is frequently switched can also be used as a criterion for determining whether to immediately perform cell reselection. Specifically: obtain the historical change frequency of the tracking area identifier of the target cell; if the historical change frequency is greater than or equal to the set handover frequency, delay the reselection and monitor the target cell.

[0075] For example, in this disclosed embodiment, as the satellite moves, its corresponding tracking area changes continuously, and therefore, the tracking area identifier of the target cell also changes continuously. In this disclosed embodiment, the historical change frequency of the target cell's tracking area identifier is obtained. Here, the historical change frequency refers to the frequency with which the target cell's tracking area identifier changes over a past period of time (e.g., one day, one week, etc.).

[0076] In this disclosed embodiment, if the obtained historical change frequency is greater than or equal to the set handover frequency (e.g., 2 times / hour), the reselection is delayed and the target cell is monitored. If the historical change frequency is less than the set handover frequency, the target cell can be directly reselected.

[0077] This disclosed embodiment reduces resource waste caused by frequent cell reselection under unstable network conditions by using the historical change frequency of the target cell's tracking area identifier as a criterion for determining whether to immediately perform cell reselection.

[0078] As an optional embodiment of this disclosure, the cell reselection method 200 further includes: when the signal parameters of the serving cell meet the set threshold conditions and the mobile terminal is in a set state, initiating a satellite handover request to switch the satellite providing communication services to the mobile terminal from the current satellite to the target satellite.

[0079] For example, in this disclosed embodiment, the satellite providing communication services to the mobile terminal may include geostationary orbit (GEO) satellites and geosynchronous orbit (GEO) satellites, wherein the GEO satellites may further include low Earth orbit (LEO) satellites and medium Earth orbit (MEO) satellites. In this disclosed embodiment, the aforementioned current satellite refers to a geosynchronous orbit satellite (i.e., LEO or MEO), and the aforementioned target satellite refers to a geostationary orbit (GEO) satellite.

[0080] In this disclosed embodiment, the aforementioned setting state refers to the mobile terminal being in a sleep / standby state. At this time, the mobile terminal's communication module and processor, etc., can still maintain a certain level of operational capability to monitor satellite signals and execute necessary commands. Therefore, the mobile terminal can initiate a satellite handover request to the satellite while in a sleep / standby state, to switch the satellite providing communication services to the mobile terminal from the current satellite (i.e., LEO or MEO) to the target satellite (i.e., GEO).

[0081] In this disclosed embodiment, when the mobile terminal is in standby mode, the satellite providing communication services to it is switched from the current satellite (i.e., LEO or MEO) to the target satellite (i.e., GEO), thereby further reducing the number of TA changes for the mobile terminal and reducing the power consumption of the mobile terminal in idle mode.

[0082] The following is combined with Figure 3 The exemplary flowchart of the cell reselection method shown describes cell reselection, such as... Figure 3 As shown, the mobile terminal initially anticipates cell reselection. Then, while the mobile terminal is idle, it performs neighbor cell measurements to find a target cell that meets the signal conditions (i.e., the reselection conditions set above). Next, it reads the target cell's system message to retrieve the target tracking area identifier (TAC). After reading the TAC, it determines whether the target cell matches the serving cell based on the TAC and the current tracking area identifier of the serving cell. If they match, reselection to the target cell proceeds directly. If they don't match, the target cell is added to the candidate cell list to increase its reselection priority. Further, it checks whether the serving cell's signal meets the threshold (i.e., the threshold conditions set above). If it does, reselection to the target cell proceeds directly. If not, reselection is delayed, and the process returns to reading the target cell's system message to monitor the target cell. This reduces neighbor cell measurements and other steps in the conventional reselection process, further reducing the mobile terminal's power consumption.

[0083] The following is combined with Figure 4A The diagram shows an example of cell reselection using conventional cell reselection methods. Figure 4BThe example diagrams shown illustrate the application of the cell reselection method of this disclosure embodiment to perform cell reselection, thus describing the technical effects of the solution disclosed in this disclosure embodiment. For example... Figure 4A As shown, during the satellite's movement along the indicated direction, if a conventional cell reselection scheme is followed, then the mobile terminal (i.e., Figure 4A In the mobile phone (within the T1 to T3 time period), the tracking area of ​​the mobile terminal will change from TAC2 to TAC1 and then back to TAC2, resulting in multiple TA changes and increased power consumption; for example, Figure 4B As shown in the disclosed scheme, during the satellite's movement along the indicated direction, the tracking area changes at time T2. At this time, cell reselection is not performed. Cell reselection is performed only when the mobile terminal's serving cell and the target cell are in the same tracking area. This ensures that the mobile terminal remains in the cell of TAC2 throughout the entire cell reselection process, reducing the signaling interaction process initiated due to TA changes and reducing the power consumption of the mobile terminal in idle state.

[0084] Figure 5 A schematic diagram of a cell reselection device 500 according to some embodiments of this disclosure is shown. The cell reselection device 500 is applied to a mobile terminal.

[0085] like Figure 5 As shown, the cell reselection device 500 includes: a reselection initiation module 510, used to initiate the cell reselection process and select a target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to the set reselection conditions; and a reselection module 520, used to delay the reselection and monitor the target cell if the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell and the signal parameters of the serving cell do not meet the set threshold conditions, until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell, and then reselect to the target cell to complete the reselection process.

[0086] As an optional embodiment of this disclosure, the reselection initiation module 210 is specifically used to: perform signal quality measurements on the serving cell and neighboring cells in an idle state; and select a target cell from the neighboring cells and serving cells according to the set reselection conditions.

[0087] As an optional embodiment of this disclosure, the cell reselection device 500 further includes: a candidate list addition module, used to add the target cell to the created candidate target cell list if the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell, so as to improve the reselection priority of the target cell; the target tracking area identifier of the target cell is obtained through the following modules: a first reading module, used to read the system message of the target cell; a second reading module, used to read the target tracking area identifier of the target cell from the system message of the target cell.

[0088] As an optional embodiment of this disclosure, the signal parameters include at least one of the following: reference signal received power, signal-to-noise ratio, and reference signal received quality. The threshold conditions include at least one of the following: reference signal received power is less than or equal to a preset reference signal received power threshold; signal-to-noise ratio is less than or equal to a preset signal-to-noise ratio threshold; and reference signal received quality is less than or equal to a preset reference signal received quality threshold.

[0089] As an optional embodiment of this disclosure, the cell reselection device 500 further includes:

[0090] The network demand determination module is used to determine the current network demand of the mobile terminal;

[0091] The threshold determination module is used to determine a preset reference signal received power threshold, a preset signal-to-noise ratio threshold, or a preset reference signal received quality threshold based on the current network requirements.

[0092] As an optional embodiment of this disclosure, the cell reselection device 500 further includes:

[0093] The historical change frequency acquisition module is used to acquire the historical change frequency of the tracking area identifier of the target cell;

[0094] The monitoring module is used to delay the reselection and monitor the target cell if the historical change frequency is greater than or equal to the set handover frequency.

[0095] As an optional embodiment of this disclosure, when the signal parameters of the serving cell meet a set threshold condition and the mobile terminal is in a set state, the cell reselection device 500 further includes:

[0096] The switching module is used to initiate a satellite switching request to switch the satellite providing communication services to the mobile terminal from the current satellite to the target satellite.

[0097] As an optional embodiment of this disclosure, before executing the cell reselection initiation procedure, the cell reselection device 500 further includes:

[0098] The network model determination module is used to determine the network type currently used by the mobile terminal;

[0099] The first execution module is used to initiate the cell reselection process if the network type is cellular network.

[0100] The second execution module is used to prevent the cell reselection process from being initiated if the network type is WiFi.

[0101] As an optional embodiment of this disclosure, the cell reselection device 500 further includes: a first reselection completion module, used to reselect to the target cell and complete the reselection process if the target tracking area identifier is consistent with the current tracking area identifier of the serving cell.

[0102] As an optional embodiment of this disclosure, the cell reselection device 500 further includes: a second reselection completion module, used to reselect to the target cell and complete the reselection process when the signal parameters of the serving cell meet the set threshold conditions.

[0103] For detailed implementation methods and technical effects, please refer to the specific description of the above-mentioned cell reselection method 200 embodiment, which will not be repeated here.

[0104] This completes the work on... Figure 5 Description of the device shown.

[0105] Correspondingly, this disclosure also provides Figure 5 The hardware structure diagram of the device shown is as follows: Figure 6 As shown, the cell reselection device 600 can be a device that implements the cell reselection method 200 described above. For example... Figure 6 As shown, the cell reselection device 600 includes a processor 610 and a memory 620. The memory 620 is configured to store program instructions; the processor 610 is configured to load and execute the program instructions stored in the memory 620 to implement the corresponding cell reselection method embodiment shown above.

[0106] As one embodiment, memory 620 can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as program instructions, data, etc. For example, memory 620 can be volatile memory, non-volatile memory, or similar storage media. Specifically, memory 620 can be RAM (Random Access Memory), flash memory, storage drives (such as hard disk drives), solid-state drives, any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or combinations thereof.

[0107] This concludes the process. Figure 6 Description of the cell reselection equipment shown.

[0108] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A cell reselection method, characterized in that, The method is applied to a mobile terminal and includes: Initiate the cell reselection process and select the target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to the set reselection conditions; If the target tracking region identifier of the target cell is inconsistent with the current tracking region identifier of the serving cell, then when the signal parameters of the serving cell do not meet the set threshold conditions, the reselection is delayed and the target cell is monitored until the target tracking region identifier of the target cell is consistent with the current tracking region identifier of the serving cell, and then the reselection is performed to the target cell to complete the reselection process.

2. The method according to claim 1, characterized in that, The step of selecting a target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to the set reselection conditions includes: In idle state, signal quality measurements are performed on the serving cell and the neighboring cells; According to the set reselection conditions, the target cell is selected from the neighboring cells and the serving cells.

3. The method according to claim 1, characterized in that, If the target tracking region identifier of the target cell is inconsistent with the current tracking region identifier of the serving cell, the target cell is added to the list of created candidate target cells to improve the reselection priority of the target cell. The target tracking region identifier of the target cell is obtained through the following steps: Read the system messages of the target cell; Read the target tracking area identifier of the target cell from the system message of the target cell.

4. The method according to claim 1, characterized in that, The signal parameters include at least one of the following: reference signal received power, signal-to-noise ratio, and reference signal received quality; the set threshold condition includes at least one of the following: The reference signal received power is less than or equal to a preset reference signal received power threshold; The signal-to-noise ratio is less than or equal to a preset signal-to-noise ratio threshold; The reference signal reception quality is less than or equal to a preset reference signal reception quality threshold.

5. The method according to claim 4, characterized in that, The method further includes: Determine the current network requirements of the mobile terminal; The preset reference signal received power threshold, preset signal-to-noise ratio threshold, or preset reference signal received quality threshold is determined based on the current network requirements.

6. The method according to claim 1, characterized in that, The method further includes: Obtain the historical change frequency of the tracking area identifier of the target cell; If the historical change frequency is greater than or equal to the set handover frequency, then the reselection is delayed and the target cell is monitored.

7. The method according to claim 1, characterized in that, When the signal parameters of the serving cell meet a set threshold condition and the mobile terminal is in a set state, the method further includes: Initiate a satellite handover request to switch the satellite providing communication services to the mobile terminal from the current satellite to the target satellite.

8. The method according to claim 1, characterized in that, Before executing the cell reselection initiation procedure, the method further includes: Determine the network type currently being used by the mobile terminal; If the network type is a cellular network, then execute the cell reselection process; If the network type is a WiFi network, the cell reselection process will not be executed.

9. The method according to claim 1, characterized in that, The method further includes: If the target tracking region identifier is consistent with the current tracking region identifier of the serving cell, then the target cell is reselected, and the reselection process is completed.

10. The method according to claim 1, characterized in that, When the signal parameters of the serving cell meet the set threshold conditions, the cell is reselected to the target cell, thus completing the reselection process.

11. A device for cell reselection, characterized in that, The device is applied to a mobile terminal and includes: The cell reselection initiation module is used to initiate the cell reselection process and select the target cell from the serving cell where the mobile terminal is currently located and the neighboring cells of the serving cell according to the set reselection conditions. The reselection module is used to delay reselection and monitor the target cell if the target tracking area identifier of the target cell is inconsistent with the current tracking area identifier of the serving cell. If the signal parameters of the serving cell do not meet the set threshold conditions, the module will reselect the target cell and monitor it until the target tracking area identifier of the target cell is consistent with the current tracking area identifier of the serving cell. Then, the module will reselect the target cell and complete the reselection process.

12. A cell reselection device, characterized in that, include: processor; A memory that stores program instructions, which, when executed by the processor, implement the method according to any one of claims 1-10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the method according to any one of claims 1-10.

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