Cell selection method and communication device

Abstract

The embodiment of the invention discloses a cell selection method and a communication device, relates to the field of communication, and can improve the user experience of public users around a high-speed railway private network. The method comprises the following steps: residing in a first high-speed rail cell under a high-speed rail private network; and under the condition that the user is a public user around the high-speed railway private network, if a first public network cell of which the signal quality meets a first condition exists in the public network, residing in the first public network cell. The embodiment of the invention is used for the process that the terminal equipment selects the cell to reside.

Description

Technical Field

[0001] This application relates to the field of communications, and in particular, to a cell selection method and a communication device. Background Art

[0002] Generally, a dedicated high-speed rail network is laid along the high-speed rail line, which can serve high-speed rail users taking the high-speed rail. Residential users near the high-speed rail line can be referred to as public users or non-high-speed rail users. A network that can be accessed by both public users and high-speed rail users can be called a public network.

[0003] The network deployment strategies of the dedicated high-speed rail network and the public network are isolated from each other, and cell reselection and handover are prohibited between the high-speed rail network and the public network. For public users around a high-speed rail cell staying under the high-speed rail network, if a public user occupies the dedicated high-speed rail network, that is, when the public user probabilistically accesses a high-speed rail cell, it cannot switch or reselect to the public network. When a high-speed rail passes by, the load on the high-speed rail cell may be heavy, such as a sharp increase in traffic volume in a short period of time. If a public user moves to a position relatively far from the high-speed rail cell, situations such as sudden disconnection and inability to make calls may occur, resulting in a poor user experience. Summary of the Invention

[0004] Embodiments of this application provide a cell selection method and a communication device, which can improve the user experience of public users around the dedicated high-speed rail network.

[0005] In a first aspect, a cell selection method is provided. Optionally, the execution subject of this method can be a terminal device, or a component or device applied to the terminal device (such as a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the terminal device. The method includes: camping on a first high-speed rail cell under the dedicated high-speed rail network; when the user is a public user around the dedicated high-speed rail network, if there is a first public network cell in the public network whose signal quality meets the first condition, then camping on the first public network cell.

[0006] That is, when this method identifies a public user around the dedicated high-speed rail network, it can preferentially select a public network cell that meets the conditions for camping. In this way, public users around the dedicated high-speed rail network can perform cell escape under the public network. When a high-speed rail passes through the dedicated high-speed rail network, the impact of the "tidal load" formed by the passing of the high-speed rail train on the perception of public users can be reduced, that is, the impact on the perception of public users when they still stay in the high-speed rail cell can be reduced, and the situation where the high-speed rail cell where the public user stays is similar to an "island cell" and cannot reselect or handover to a cell with better energy can be avoided, improving the experience of public users around the dedicated high-speed rail network.

[0007] In a possible design, when it is sensed that the moving speed of the user is less than or equal to the speed threshold within a preset time period, if the resident cell is a high-speed rail cell, the user is a public user around the high-speed rail private network. That is, first, it is judged whether the moving speed of the user sensed within the preset time period is less than or equal to the speed threshold. If it is determined that the moving speed of the user sensed within the preset time period is less than or equal to the speed threshold, then it is judged whether the user is resident in a high-speed rail cell. If it is determined that the user is resident in a high-speed rail cell, it is determined that the user is a public network user around the high-speed rail private network. By making judgments in these two judgment stages, the power consumption of the terminal device can be saved. That is, when it is judged that the moving speed of the user sensed within the preset time period is greater than the speed threshold, there is no need to perform the judgment process of whether the user is resident in a high-speed rail cell, thus saving the power consumption of the terminal device. Moreover, when the user is identified as a public user, a public network cell can be preferentially selected for residence, improving the user experience of public users.

[0008] In a possible design, when the time of residence in the first high-speed rail cell is greater than or equal to the time threshold and it is sensed that the moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network. This is because the moving speed of high-speed rail users is relatively fast when they are on the high-speed rail. When the moving speed of the user, that is, the terminal device, is slow and the residence time in the high-speed rail cell is long, it can be considered that the user is a public user around the high-speed rail private network, so that when this public user is identified, a public network cell can be preferentially selected for residence, improving the user experience of public users.

[0009] In a possible design, when it is recognized within a preset time period that the resident cell is a high-speed rail cell and it is sensed that the moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network; where the preset time period includes at least one of the following time periods: the time period when the high-speed rail is not in operation, the time period when the number of high-speed rail operations is less than or equal to the preset number, or the time period when the high-speed rail does not pass through the first high-speed rail cell. That is to say, within these preset time periods, if the moving speed of the user is slow, it can be considered that the user is a public user around the high-speed rail private network, so that when this public user is identified, a public network cell can be preferentially selected for residence, improving the user experience of public users.

[0010] In a possible design, if there is a first public network cell in the public network whose signal quality meets the first condition, camping on the first public network cell includes: initiating a background search. If there is a first public network cell in the public network whose signal quality meets the first condition, initiating cell reselection to the first public network cell and camping on the first public network cell; or, initiating automatic neighbor relation measurement. If there is a first public network cell in the public network whose signal quality meets the first condition, initiating cell reconstruction to the first public network cell and camping on the first public network cell. In this way, the terminal device can select a public network cell according to the signal energy coverage of the public network. When there is a public network cell with relatively better energy, the terminal device can preferentially select the public network cell for camping, which can avoid potential problems such as high-speed rail "island cells" (unable to handover or reselect to other cells) and "tidal load" (high cell load), and at the same time, when the public network coverage energy is good, it can balance the loads of high-speed rail base stations and public network base stations, improving the user experience of high-speed rail users and public network users.

[0011] In a possible design, before initiating a background search or initiating automatic neighbor relation measurement, the method further includes: determining that the signal quality of the first high-speed rail cell is less than or equal to the first signal quality threshold. In this way, when it is determined in real time that the energy of the currently camped high-speed rail cell is poor, cell reselection or reconstruction to the first public network cell that meets the first condition can be performed in a timely manner. The terminal device can select a public network cell according to the signal energy coverage of the high-speed rail dedicated network and the public network. Similarly, when there is a public network cell with relatively better energy, the public network cell can be preferentially selected for camping, which can avoid potential problems such as high-speed rail "island cells" and "tidal load".

[0012] In a possible design, the method further includes: when the signal quality of the first public network cell is less than or equal to the second signal quality threshold and it is unable to handover or reselect to other public network cells, initiating a background search or initiating automatic neighbor relation measurement; if there is a second high-speed rail cell in the high-speed rail dedicated network that meets the second condition, camping on the second high-speed rail cell. In this way, the terminal device can select a high-speed rail cell according to the signal energy coverage of the high-speed rail dedicated network and the public network. When there is no public network cell available, if the energy of the currently camped first public network cell is low, and if there is a high-speed rail cell with relatively better energy, the high-speed rail cell can also be selected for camping to improve the user experience of public users.

[0013] In a possible design, if there is a first public network cell in the public network whose signal quality meets the first condition, camping on the first public network cell includes: in the case of initiating any one of the processes of cell search, cell reselection, cell reconstruction, or cell redirection, searching or measuring available public network frequency points, and if there is a first public network cell in the public network whose signal quality meets the first condition, camping on the first public network cell. In this way, it is equivalent that the present application can select high-speed rail cells and public network cells according to the principle of dedicated private network. When the user is a public user around the high-speed rail, preferentially selecting a public network cell for camping can avoid potential problems such as "isolated cells" and "tidal loads" of the high-speed rail, and provide a better cell selection method for public users before the energy of the camping cell deteriorates. At the same time, it can balance the loads of high-speed rail base stations and public network base stations and improve the user experience of high-speed rail users and public users.

[0014] In a possible design, if there is a first public network cell in the public network whose signal quality meets the first condition, camping on the first public network cell includes: in the case where the load of the first high-speed rail cell is in the first load state, initiating a background search or initiating an automatic neighbor cell relation measurement, and if there is a first public network cell in the public network whose signal quality meets the first condition, camping on the first public network cell. Among them, the first load state can be understood as a high load state. In this way, for the terminal device, the terminal device can dynamically select a high-speed rail cell or a public network cell at a smaller time interval. When the high-speed rail base station is in a high load, the terminal device selects a public network cell to improve the user experience of public users.

[0015] In a possible design, the method further includes: in the case where the load of any high-speed rail cell is in the second load state, initiating a background search or initiating an automatic neighbor cell relation measurement, and if there is a second high-speed rail cell in the high-speed rail private network whose signal quality meets the third condition, camping on the second high-speed rail cell. Among them, the first load state can be understood as a low load state. In this way, for the terminal device, the terminal device can dynamically select a high-speed rail cell or a public network cell at a smaller time interval. When the terminal device is camping on the first public network cell, if it is found that any high-speed rail cell in the cells under the high-speed rail base station / private network is in a low load, it can initiate a background search or initiate an automatic neighbor cell relation measurement, and select the second high-speed rail cell with better signal quality for camping to improve the user experience of public users.

[0016] In a possible design, the first condition includes at least one of the following: the difference between the signal quality of the public network cell and the signal quality of the first high-speed rail cell is greater than or equal to the first preset offset; or, the signal quality of the public network cell is greater than or equal to the second signal quality threshold.

[0017] In a possible design, the second condition includes at least one of the following: the difference between the signal quality of the high-speed rail cell and the signal quality of the first public network cell is greater than or equal to a second preset bias; or, the signal quality of the high-speed rail cell is greater than or equal to a third signal quality threshold.

[0018] In a possible design, the third condition includes at least one of the following: the difference between the signal quality of the high-speed rail cell and the signal quality of the first high-speed rail cell is greater than or equal to a third preset bias; or, the signal quality of the high-speed rail cell is greater than or equal to a fourth signal quality threshold.

[0019] In a second aspect, a communication device is provided, including: a residence module, configured to reside in a first high-speed rail cell under the high-speed rail private network; a selection module, configured to, when the user is a public user around the high-speed rail private network, if there is a first public network cell in the public network whose signal quality meets the first condition, then reside in the first public network cell.

[0020] For the beneficial effects of the second aspect, reference can be made to the description of the first aspect.

[0021] In a possible design, the selection module is configured to: initiate a background search, if there is a first public network cell in the public network whose signal quality meets the first condition, then initiate cell reselection to the first public network cell and reside in the first public network cell; or, initiate automatic neighbor cell relation measurement, if there is a first public network cell in the public network whose signal quality meets the first condition, then initiate cell reconstruction to the first public network cell and reside in the first public network cell.

[0022] In a possible design, before initiating the background search or initiating the automatic neighbor cell relation measurement, it further includes a determination unit configured to: determine that the signal quality of the first high-speed rail cell is less than or equal to a first signal quality threshold.

[0023] In a possible design, it further includes a measurement unit, configured to initiate a background search or initiate automatic neighbor cell relation measurement when the signal quality of the first public network cell is less than or equal to a second signal quality threshold and it is not possible to switch or reselect to other public network cells; the residence unit is further configured to: if there is a second high-speed rail cell in the high-speed rail private network that meets the second condition, then reside in the second high-speed rail cell.

[0024] In a possible design, the selection unit is configured to: in the case of initiating any one of the processes of cell search, cell reselection, cell reconstruction, or cell redirection, search for or measure available public network frequency points, if there is a first public network cell in the public network whose signal quality meets the first condition, then reside in the first public network cell.

[0025] In a possible design, the selection unit is configured to: when the load of the first high-speed rail cell is in the first load state, initiate a background search or initiate an automatic neighbor cell relation measurement, and if there is a first public network cell in the public network whose signal quality meets the first condition, camp on the first public network cell.

[0026] In a possible design, the selection unit is configured to: when the load of any high-speed rail cell is in the second load state, initiate a background search or initiate an automatic neighbor cell relation measurement, and if there is a second high-speed rail cell in the high-speed rail private network whose signal quality meets the third condition, camp on the second high-speed rail cell.

[0027] In a third aspect, a communication device is provided, including a module for performing the method according to the first aspect and any possible design of the first aspect.

[0028] In a fourth aspect, a communication device is provided, including one or more processors configured to execute the method according to the first aspect and any possible design in the first aspect.

[0029] In a fifth aspect, a computer-readable storage medium is provided, in which computer instructions are stored, and when the computer instructions run on a communication device, the communication device is caused to execute the method according to the first aspect and any possible design in the first aspect.

[0030] In a sixth aspect, a computer program product is provided, including computer instructions, and when the computer instructions run on a communication device, the communication device is caused to execute the method according to any item in the first aspect and the first aspect.

[0031] In a seventh aspect, a chip is provided, the chip stores computer execution instructions, and when the computer execution instructions are run, the method according to the first aspect and any possible design in the first aspect is executed.

[0032] In an eighth aspect, a communication system is provided, including a first communication device and a second communication device, the first communication device is configured to execute the method according to the first aspect and any possible design in the first aspect, and the second communication device is configured to perform the functions of a network device, such as a base station.

[0033] It can be understood that any of the above-provided communication devices, chips, communication systems, computer-readable storage media, or computer program products can be applied to the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods, which will not be elaborated here. Description of the Drawings

[0034] Figure 1Schematic diagram of the architecture of a wireless communication system provided by an embodiment of the present application;

[0035] Figure 2 Schematic diagram of the communication architecture of 5G NR provided by an embodiment of the present application;

[0036] Figure 3 Schematic diagram of the communication architecture of 4G LTE (E-UTRA) provided by an embodiment of the present application;

[0037] Figure 4 Schematic diagram of the network layout of a high-speed rail private network and a public network provided by an embodiment of the present application;

[0038] Figure 5 Schematic diagram of the process of a cell selection method provided by an embodiment of the present application;

[0039] Figure 6 Schematic diagram of the process of a cell selection method provided by an embodiment of the present application;

[0040] Figure 7 Schematic diagram of the scenario of a public user around a high-speed rail private network escaping between a public network and a high-speed rail private network provided by an embodiment of the present application;

[0041] Figure 8 Schematic diagram of the process of a cell selection method provided by an embodiment of the present application;

[0042] Figure 9 Schematic diagram of the process of a cell selection method provided by an embodiment of the present application;

[0043] Figure 10 Schematic diagram of the load situation of a high-speed rail cell when a public network intrusion is serious provided by an embodiment of the present application;

[0044] Figure 11 Schematic diagram of the structure of a communication device provided by an embodiment of the present application;

[0045] Figure 12 Schematic diagram of the structure of a communication device provided by an embodiment of the present application. Detailed implementation manners

[0046] For ease of understanding, some technical terms in the present application are first explained below.

[0047] High-speed rail private network: A network laid along the high-speed rail line and specifically serving high-speed rail users.

[0048] High-speed rail cell: Whether a cell is a high-speed rail cell can be identified by the configuration parameters in the system information block (SIB) 1, which is an inherent attribute of the cell. For example, when any of the following information is included in SIB1, the cell can be identified as a high-speed rail cell: high speed dedicated network (HSDN) information element, highSpeedConfig-r16, prach-ConfigurationIndex is 200 or 202 or 210, restrictedsetconfig is restrictedSetTypeA or restrictedSetTypeB.

[0049] Public users: Residential users near high-speed rail lines, also known as non-high-speed rail users. For example, areas near high-speed rail lines may include densely populated urban areas, general urban areas, suburbs or rural areas.

[0050] Public community: Different from the high-speed rail community, this network is accessible to both public users and high-speed rail users.

[0051] Initial search: Also known as cell search, it is the process of the terminal and the cell achieving downlink synchronization (including time and frequency synchronization) and detecting the cell identity (ID). After the cell search is completed, the terminal can choose the cell with the best signal to reside in.

[0052] Background search: A professional term in the protocol, which can be understood as the act of searching the Internet through background tasks.

[0053] Reconstruction: A professional term in the protocol. When in the radio resource control (RRC) connection state, if there is a handover failure, radio link failure, integrity protection failure, RRC reconfiguration failure, etc., the RRC connection reconstruction process will be triggered. This process aims to reconstruct the RRC connection, including the recovery of SIB1 and radio signaling bearer (SRB) 1 operations, and secure reactivation. The terminal will perform a reconstruction search process.

[0054] Redirection: A professional term in the protocol. Redirection is an implementation method. When a handover process needs to be performed, but the handover process cannot be performed due to equipment reasons, the base station sends an RRC connection release message to the terminal. The message carries the frequency of the hetero-frequency or hetero-system neighboring cell, allowing the terminal to initiate random access to the hetero-frequency or hetero-system neighboring cell and re-perform services, thereby achieving the purpose of terminal transfer between cells. The redirection method omits the process of sending a handover request to the neighboring cell. Compared with the real handover method, the way of handling terminal transfer is different.

[0055] Reselection: A protocol term. A terminal in the RRC idle state measures the signal quality of the serving cell and neighboring cells. If the signal quality of the serving cell is poor while that of a neighboring cell is good, the terminal will actively reselect a cell with a higher priority or better signal quality as the serving cell. This process is called cell reselection.

[0056] Automatic neighbor relation (ANR) measurement and autonomous ANR measurement: It refers to the network side's function of automatically configuring and optimizing the neighbor relation table by leveraging the terminal's measurement and reporting capabilities of the physical cell identifier (PCI) and cell global identifier (CGI) of surrounding neighboring cells, including the automatic addition and deletion of neighboring cells. Autonomous ANR is different from protocol ANR. The terminal can independently initiate the measurement of neighboring cell information to identify whether a neighboring cell is a high-speed rail cell or a public cell.

[0057] Historical search / measurement, cloud information: During the search process, the terminal records the frequencies and cell information of the cells where it has successfully camped and decoded the system message. It can also record prior information such as big data records, reserved cloud frequencies, and cells.

[0058] Mobility management: It is the management of the terminal's location information, security, and service continuity, etc. The purpose is to maintain the connection state between the terminal and the network, thereby ensuring various services.

[0059] Handover: A method of connection state mobility management. Through the handover process, the network can change a more suitable serving cell for a connected terminal to ensure the continuous operation of the terminal's services. For example, when the terminal moves away from the current serving cell, the network enables the terminal to continue working under the new serving cell through handover. Handover can specifically include: primary Cell (PCell) handover, primary secondary Cell (PSCell) change.

[0060] Generally, the network's handover of a terminal is based on the measurement results reported by the terminal. The serving base station can configure the terminal to measure the serving cell and surrounding neighboring cells. The measurement events are generally A3 / A4 / A5 / B1 / B2 events; the terminal performs measurements to obtain the measurement results and reports them to the serving base station; the serving base station decides whether to perform a handover on the terminal based on the terminal's measurement results, and determines the target base station / cell for handover in the case of a need for handover. For example, when the quality of the current serving cell is poor, or when there is a neighboring cell whose quality is better than that of the current serving cell by a certain degree, the serving base station can trigger the terminal to handover to a neighboring cell with better quality.

[0061] Embodiments of the present application can be applied to wireless communication systems such as the fourth-generation mobile communication (4G), the fifth-generation mobile communication (5G), the sixth-generation mobile networks (6G), satellite communication, and future possible communication technologies, including but not limited to narrow band-internet of things (NB-IoT) systems, global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), universal mobile telecommunications system (UMTS), wideband code division multiple access (WCDMA) systems, code division multiple access 2000 (CDMA2000) systems, time division-synchronization code division multiple access (TD-SCDMA) systems, the long term evolution (LTE) of 4G, the three major application scenarios of 5G mobile communication systems (enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and enhanced machine-type communication (eMTC)), 6G mobile communication systems, and future possible mobile communication systems, etc.

[0062] Figure 1 It is a schematic diagram of the architecture of the wireless communication system 10 to which the embodiments of the present application are applied. As Figure 1 shown, the communication system 10 includes a radio access network (RAN) 100. Among them, the RAN 100 includes at least one RAN node (such as Figure 1 110a and 110b in, collectively referred to as 110), and may also include at least one terminal (such asFigure 1 Among 120a - 120j (collectively referred to as 120). RAN 100 may also include other RAN nodes, for example, wireless relay devices and / or wireless backhaul devices ( Figure 1 not shown in the figure). The terminal 120 is connected to the RAN node 110 wirelessly. Terminals can be interconnected with each other, and RAN nodes can be interconnected with each other, either wired or wirelessly. The communication system 10 may also include a core network 200. The RAN node 110 is connected to the core network 200 either wirelessly or wired. The core network devices in the core network 200 and the RAN nodes 110 in the RAN 100 may be independent and different physical devices, or may be the same physical device integrating the logical functions of the core network devices and the logical functions of the RAN nodes. The communication system 10 may also include the Internet 300.

[0063] RAN 100 may be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, and a future radio access system defined in the 3rd generation partnership project (3GPP). RAN 100 may also include two or more different radio access systems as described above. RAN 100 may also be an open RAN (O-RAN).

[0064] The RAN node, also known as a radio access network device, a RAN entity, or an access node, is used to help a terminal access the communication system wirelessly. In one application scenario, the RAN node may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5th generation (5G) mobile communication system, a next generation NodeB in a 6th generation (6G) mobile communication system, or a base station in a future mobile communication system. The RAN node may be a macro base station (such as Figure 1 110a in the figure), or a micro base station or an indoor station (such as Figure 1 110b in the figure), or may also be a relay node or a donor node.

[0065] In another application scenario, the wireless access of a terminal can be assisted through the cooperation of multiple RAN nodes, and different RAN nodes respectively implement some functions of the base station. For example, the RAN node can be a central unit (CU), a distributed unit (DU), or a radio unit (RU). Here, the CU completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete some or all of the functions of the physical layer. For the specific descriptions of the above various protocol layers, reference can be made to the relevant technical specifications of 3GPP. The RU can be used to implement the functions of transmitting and receiving radio frequency signals. The CU and the DU can be two independent RAN nodes, or can be integrated in the same RAN node, for example, integrated in the baseband unit (BBU). The RU can be included in the radio frequency device, for example, included in the remote radio unit (RRU) or the active antenna unit (AAU). The CU can be further divided into two types of RAN nodes, namely, the CU-control plane and the CU-user plane.

[0066] In different systems, the RAN nodes may have different names. For example, in the O-RAN system, the CU can be called an open CU (O-CU), the DU can be called an open DU (O-DU), and the RU can be called an open RU (O-RU). The RAN nodes in the embodiments of the present application can be implemented in the form of software modules, hardware modules, or a combination of software modules and hardware modules. For example, the RAN node can be a server loaded with the corresponding software module. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the RAN nodes. For the convenience of description, in the following text, the base station is taken as an example of the RAN node for description.

[0067] A terminal is a device with wireless transceiver capabilities that can send signals to a base station or receive signals from a base station. A terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely applied in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart home, smart office, smart wearables, smart transportation, smart city, etc. A terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, aircraft, ship, robot, robotic arm, smart home device, etc. Embodiments of this application do not limit the specific technologies and specific device forms adopted by the terminal.

[0068] The base station and the terminal can be in fixed positions or movable. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons, and artificial satellites. Embodiments of this application do not limit the application scenarios of the base station and the terminal.

[0069] The roles of the base station and the terminal can be relative. For example, Figure 1 the helicopter or drone 120i in [figure] can be configured as a mobile base station. For those terminals 120j that access the radio access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, the communication between 110a and 120i is through the radio air interface protocol. Of course, the communication between 110a and 120i can also be through the interface protocol between base stations. At this time, relative to 110a, 120i is also a base station. Therefore, both the base station and the terminal can be uniformly referred to as communication devices. Figure 1 The 110a and 110b in [figure] can be referred to as communication devices with base station functions. Figure 1 The 120a - 120j in [figure] can be referred to as communication devices with terminal functions.

[0070] Communication can be carried out between a base station and a terminal, between base stations, and between terminals through licensed spectrum, through unlicensed spectrum, or through both licensed and unlicensed spectrum simultaneously; communication can be carried out through spectrum below 6 gigahertz (GHz), through spectrum above 6 GHz, or through both spectrum below 6 GHz and spectrum above 6 GHz simultaneously. Embodiments of this application do not limit the spectrum resources used for wireless communication.

[0071] In embodiments of this application, the functions of a base station can also be performed by modules (such as chips) in the base station, or by a control subsystem that includes base station functions. Here, the control subsystem that includes base station functions can be a control center in the above application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of a terminal can also be performed by modules (such as chips or modems) in the terminal, or by a device that includes terminal functions.

[0072] Exemplarily, embodiments of this application can be applied to, for example Figure 2 A 5G NR communication architecture 20 as shown, which includes a 5G core network (5G core network, 5GC), a 5G radio access network (next generation RAN, NG-RAN), and a terminal. The 5GC includes an access and mobility management function (access and mobility management function, AMF) network element and a user plane function (user plane function, UPF) network element. The NG-RAN includes gNB (5G base station) and ng-eNB (4G base station connected to the 5GC).

[0073] Among them, when the gNB serves as the serving base station of the terminal, it can be responsible for providing the user plane and control plane protocol functions of 5G NR for the terminal. When the ng-eNB serves as the serving base station of the terminal, it can be responsible for providing the user plane and control plane protocol functions of 4G E-UTRA for the terminal.

[0074] Exemplarily, embodiments of this application can be applied to, for example Figure 3A communication architecture 30 of 4G LTE (E-UTRA) as shown includes an evolved packet core (EPC), an E-UTRAN, and a terminal. The EPC includes a mobility management entity (MME) and a serving gateway (S-GW). The E-UTRAN includes eNBs (4G base stations) and en-gNBs (5G base stations connected to the EPC).

[0075] Among them, when an eNB serves as the serving base station of a terminal, it can be responsible for providing the user plane and control plane protocol functions of 4G LTE for the terminal. When an en-gNB serves as the serving base station of a terminal, it can be responsible for providing the user plane and control plane protocol functions of 5G NR for the terminal.

[0076] Applying the above network architecture, in some scenarios, such as Figure 4 Shown is a network layout schematic diagram of a high-speed rail private network and a public network. When a residential area is located between an ordinary railway and a high-speed railway (HSR), there will be a public network (xx-LZHN) and a high-speed rail private network (xx Railway-LZHN) around, that is, there are public network cells and high-speed rail cells. Currently, the network layout strategies of the high-speed rail private network and the public network are isolated from each other, and reselection and handover are prohibited, resulting in that public users in this residential area cannot handover or reselect to the public network after probabilistically occupying the high-speed rail private network (through initial network search, re-establishment network search, reselection). In this way, after public users in this residential area occupy the high-speed rail network, they will be affected by the "tidal load" formed by the passing of the high-speed rail, and the traffic volume will increase sharply in a short time. Moreover, when public users are relatively far from the high-speed rail private network, there may be situations such as stuttering when watching a live broadcast, suddenly disconnecting during a call, or being unable to make a call, and the call experience is poor.

[0077] Table 1 shows a network layout strategy of a high-speed rail private network and a public network. It can be seen that the high-speed rail private network will not configure neighboring cells of the public network. For public users camping on the periphery of high-speed rail cells, the high-speed rail cells where the public users camp are similar to "island cells". Whether the signal of the high-speed rail cell is strong or weak, public users camping on the periphery of the high-speed rail cell can only move on the currently camped high-speed rail cell and cannot reselect / handover to a neighboring cell with better signal strength. More seriously, in places where the signal coverage of this high-speed rail cell is poor, it will cause public users to be unable to escape in time, that is, unable to reselect / handover to a neighboring cell with better signal strength.

[0078] Table 1 Network Layout Strategy of High-Speed Rail Private Network and Public Network

[0079]

[0080] In addition, when public users around the high-speed rail dedicated network occupy the high-speed rail dedicated network and a high-speed rail passes through the high-speed rail dedicated network, the perception of public users will be affected, easily resulting in slow Internet access speed, call drops, or even network disconnection for public users. For example, when a high-speed rail passes through the high-speed rail dedicated network, the rate of public users may be pulled down, and the retransmission ratio is relatively high, resulting in a large number of scheduling failures and easily leading to slow Internet access speed. According to data statistics, the average physical distance between high-speed rail cells is 560 meters (m), the average passing time of a high-speed rail is 1.5 minutes (min) to 3 min, and the rate of 4G users drops from 20 megabytes (M) to less than 1 M. However, in the case of no congestion, public users cannot escape. Unless in severe scenarios, such as in the case of severe congestion, the public users currently occupying the high-speed rail cells around the high-speed rail dedicated network will be added to the congestion list and other cells will be reselected, resulting in poor user experience.

[0081] Therefore, for public users around the high-speed rail dedicated network, although they can escape when staying in the high-speed rail cell, the time for triggering the escape to take effect is late and the effect is poor, and problems such as "island cells" or "tidal load" of high-speed rails encountered by public users cannot be avoided. Therefore, the embodiment of the present application proposes a cell selection method. When identifying public users around the high-speed rail dedicated network, this method can preferentially select a public network cell with better signal for residence. In this way, public users around the high-speed rail dedicated network can escape from the cell under the public network. When a high-speed rail passes through the high-speed rail dedicated network, the impact of the "tidal load" formed by the passing of the high-speed rail train on the perception of public users can be reduced, and the situation where the high-speed rail cell where the public user stays is similar to an "island cell" can be avoided, improving the experience of public users around the high-speed rail dedicated network.

[0082] Based on the above summary description of the present application, the embodiments of the present application will be introduced below.

[0083] As Figure 5 shown in the flowchart of a cell selection method provided by an embodiment of the present application. Taking the terminal device as the execution entity as an example, this method includes the following processes.

[0084] 501. The terminal device stays in the first high-speed rail cell under the high-speed rail dedicated network.

[0085] In some embodiments, when receiving the system message sent by the base station of the first high-speed rail cell, the terminal device can select the first high-speed rail cell with better signal quality for residence during the cell search, reselection, reconstruction, or redirection process.

[0086] In some embodiments, the base station of the first high-speed rail cell can be, for example, a 5G NR base station, a 4G LTE base station, a GSM base station, or a UMTS base station, etc.

[0087] 502. When the user is a public user around the high-speed rail private network, if there is a first public network cell in the public network whose signal quality meets the first condition, the terminal device camps on the first public network cell.

[0088] This application does not limit the method of identifying whether the user is a public user around the high-speed rail private network.

[0089] In some embodiments, when it is sensed that the moving speed of the user is less than or equal to the speed threshold within a preset time period, if the camped cell is a high-speed rail cell, the user is a public user around the high-speed rail private network.

[0090] Exemplarily, the preset time period can also be understood as a unit time. For example, if the preset time period is 15 minutes, it means that within the unit time of 15 minutes, the terminal device first judges the moving speed of the user. If the moving speed of the user is less than or equal to the speed threshold, it can then judge whether the currently camped cell is a high-speed rail cell. For example, it judges whether the SIB1 of the currently camped cell carries a field indicating that the current cell is a high-speed rail cell. If SIB1 carries this field, it is determined that the user is a public user around the high-speed rail private network. Judging in these two judgment stages can save the power consumption of the terminal device. That is, when it is judged that the moving speed of the user sensed within the preset time period is greater than the speed threshold, there is no need to perform the judgment process of whether to camp on a high-speed rail cell, saving the power consumption of the terminal device. Moreover, when it is identified that the user is a public user, a public network cell can be preferentially selected for camping, improving the user experience of public users.

[0091] Exemplarily, within the preset time period, the moving speed of the user being less than or equal to the speed threshold can be that the average value of the moving speeds at multiple time points within the preset time period is less than or equal to the speed threshold, or that there are multiple time points within the preset time period where the moving speeds are all less than or equal to the speed threshold.

[0092] In some embodiments, when the time of camping on the first high-speed rail cell is greater than or equal to the time threshold and it is sensed that the moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network.

[0093] Exemplarily, the time threshold is a time length within 5 minutes to 15 minutes. For example, the time threshold can be set to 15 minutes. For example, it can start timing when the terminal device camps on the first high-speed rail cell and receives the SIB1 sent by the first high-speed rail cell, where the SIB1 carries a field indicating that the current cell is a high-speed rail cell, and the terminal device successfully camps on the first high-speed rail cell. For example, this time point is the moment when the terminal device receives the message 4 (message4) sent by the first high-speed rail cell, or this time point is the moment when the terminal device receives the registration completion message sent by the first high-speed rail cell. And for the terminal device to sense the moving speed of the user, it is equivalent to the terminal device sensing its own moving speed.

[0094] In some embodiments, within a preset time period, when it is recognized that the camped cell is a high-speed rail cell and the sensed moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network. Among them, the preset time period includes at least one of the following time periods: the time period when the high-speed rail is not in operation, the time period when the number of high-speed rail operations is less than or equal to the preset number of times, or the time period when the high-speed rail does not pass through the first high-speed rail cell.

[0095] For example, the time period when the high-speed rail is not in operation can be preset in the terminal device. For example, the time period when the high-speed rail is not in operation is from 0 to 6 o'clock in the early morning. The time periods with fewer high-speed rail operations and the time periods when the high-speed rail does not pass through can be identified by the base station side and notified to the terminal device. If within these preset time periods, the terminal device camps on the first high-speed rail cell and receives the SIB1 sent by the first high-speed rail cell, and at the same time, the terminal device senses that the moving speed of the user is less than or equal to the speed threshold, it is recognized that the user is a public user around the high-speed rail private network.

[0096] In some embodiments, the sensing of the moving speed of the terminal device can be achieved through a speed sensor or an acceleration sensor in the terminal device. For example, through the acceleration sensor and various speed thresholds, it can be sensed that the terminal device is currently in a low-speed state, a stationary state, or a micro-motion state.

[0097] If the terminal device identifies that the user identity is a public user around the high-speed rail private network, the user identity can be retained for a period of time. During the period of retaining the user identity, if there is a first public network cell in the public network whose signal quality meets the first condition, the terminal device sends an RRC connection request to the base station of the public network to request to camp on the first public network cell.

[0098] In some embodiments, the first condition includes at least one of the following: the difference between the signal quality of the public network cell and the signal quality of the first high-speed rail cell is greater than or equal to the first preset offset; or, the signal quality of the public network cell is greater than or equal to the second signal quality threshold.

[0099] In this way, when preferentially selecting to camp on a public network cell, potential problems such as "isolated cells for high-speed railways" and "tidal loads" can be avoided. Moreover, when the public network coverage is good, it is also possible to balance the loads of high-speed railway base stations and public network base stations, and at the same time improve the user experience of high-speed railway users and public users.

[0100] It should be noted that although this application is introduced by taking the high-speed railway private network as an example, this application can also be applied to ordinary railway private networks.

[0101] Based on Figure 5 the implementation manners, the applicable scenarios of the embodiments of this application are introduced by way of example below.

[0102] As Figure 6 shown in the flowchart of a cell selection method provided by an embodiment of this application, the method includes the following processes.

[0103] 601. The terminal device camps in the traditional manner.

[0104] For example, after receiving the system message sent by the base station, the terminal device may select a cell with better signal quality to camp during the processes of cell handover, cell search, cell reselection, cell reconstruction or cell redirection. This cell may be a public network cell or a high-speed railway cell.

[0105] 602. The terminal device identifies that the user is a public user around the high-speed railway private network.

[0106] For example, when the cell camped by the terminal device in step 601 is the first high-speed railway cell, the terminal device can identify that the user is a public user around the high-speed railway private network through the identification method in step 502.

[0107] For example, steps 601 and 602 may occur in the RRC layer of the UE, that is Figure 6 shown with the terminal device as the UE in

[0108] 603. If the terminal device determines that there is a first public network cell in the public network whose signal quality meets the first condition, it camps on the first public network cell.

[0109] In some embodiments, when the terminal device camps on the first high-speed railway cell, it may initiate background search or ANR measurement to find a public network cell that meets the first condition.

[0110] In some embodiments, when the terminal device initiates background search or ANR measurement, it may be a background search request or ANR measurement request sent by the RRC layer of the terminal device to the physical layer, and the physical layer feeds back the search result or measurement result to the RRC layer.

[0111] For example, in some embodiments, when the terminal device camps on the first high-speed rail cell, if the terminal device is in the idle state or the inactive state, the terminal device may periodically initiate a background search. If there is a first public network cell in the public network whose signal quality meets the first condition, the terminal device may initiate a cell reselection to the first public network cell and camp on the first public network cell. For example, when the first condition is the implementation manner in step 502 above, it is equivalent to searching for a first public network cell whose energy is better than that of the currently camped first high-speed rail cell by a certain offset (the first preset offset), or searching for a first public network cell whose energy is greater than or equal to the second signal quality threshold, and initiating a cell reselection to the base station of the first public network cell and camping on the first public network cell. Here, the second signal quality threshold can be understood as to ensure that the terminal device can camp on the selected first public network cell to perform services. In this way, the terminal device can select a public network cell according to the signal energy coverage of the public network. When there is a public network cell with relatively better energy, the terminal device can preferentially select the public network cell to camp on, which can avoid potential problems such as high-speed rail "island cells" and "tidal loads", and at the same time, when the public network coverage energy is good, it can balance the loads of high-speed rail base stations and public network base stations, and improve the user experience of high-speed rail users and public network users.

[0112] Alternatively, in some embodiments, when the terminal device camps on the first high-speed rail cell, if the terminal device is in the connected state, the terminal device may periodically initiate ANR measurements. If there is a first public network cell in the public network whose signal quality meets the first condition, the terminal device may initiate a cell reconstruction to the first public network cell and camp on the first public network cell. For example, when the first condition is the implementation manner in step 502 above, the terminal device can measure the public network cells among the multiple cells in the terminal device's historical records, search for a first public network cell whose energy is better than that of the currently camped first high-speed rail cell by a certain offset (the first preset offset), or search for a first public network cell whose energy is greater than or equal to the second signal quality threshold, and initiate a cell reconstruction to the base station of the first public network cell and camp on the first public network cell. Among them, the public network cells in the historical records may include at least one of the public network cells that the terminal device has camped on historically or the serving cell. In this way, the terminal device can select a public network cell according to the signal energy coverage of the high-speed rail private network and the public network. When there is a public network cell with relatively better energy, the terminal device can also preferentially select the public network cell to camp on, which can avoid potential problems such as high-speed rail "island cells" and "tidal loads", and at the same time, when the public network coverage energy is good, it can balance the loads of high-speed rail base stations and public network base stations, and improve the user experience of high-speed rail users and public network users.

[0113] In some embodiments, when the terminal device camps on the first high-speed rail cell, if the terminal device is in the idle state, non-active state, or connected state, and the energy of the public user in the first high-speed rail cell is lower than a certain threshold, the terminal device can immediately initiate a background search or ANR measurement to find a public network cell that is better than the high-speed rail private network by a certain offset or higher than a certain threshold, and initiate a reselection process or a reconstruction process to the base station of the public network cell, and reselect or reconstruct to the public network cell.

[0114] Therefore, before the terminal device initiates a background search or an automatic neighbor relation measurement, the method may further include: the terminal device determines that the signal quality of the first high-speed rail cell is less than or equal to the first signal quality threshold. In this way, when it is determined in real time that the energy of the currently camped high-speed rail cell is poor, cell reselection or reconstruction to the first public network cell that meets the first condition can be performed in a timely manner. The terminal device can select a public network cell according to the signal energy coverage of the high-speed rail private network and the public network. Similarly, when there is a public network cell with relatively better energy, the public network cell can be preferentially selected for camping, which can avoid potential problems such as high-speed rail "island cells" and "tidal loads".

[0115] Of course, as long as the terminal device meets any one of the above three scenarios, cell reselection / reconstruction can be performed.

[0116] The above reselection or reselection process may occur at the RRC layer of the terminal device.

[0117] 604. When the signal quality of the first public network cell is less than or equal to the second signal quality threshold and it is impossible to switch or reselect to other public network cells, initiate a background search or an ANR measurement; if there is a second high-speed rail cell that meets the second condition in the high-speed rail private network, camp on the second high-speed rail cell.

[0118] That is, when the energy of the first public network cell where the public user camps around the high-speed rail private network is lower than the second signal quality threshold and there is no other public network cell to choose from, a second high-speed rail cell that is better than the current first public network cell by a certain offset can be found through a background search or ANR measurement, and an RRC connection request is sent to the base station of the second high-speed rail cell, and camp on the second high-speed rail cell.

[0119] Exemplarily, for example, when the network side misconfigures a high-priority high-speed rail cell for the terminal device when the terminal device camps on the first public network cell and does not configure a public network cell as a neighbor cell of the first public network cell, resulting in no public network cell available for the terminal device, the terminal device can find a second high-speed rail cell that is better than the current first public network cell by a certain offset through a background search or ANR measurement.

[0120] In some embodiments, the second condition includes at least one of the following: the difference between the signal quality of the high-speed rail cell and the signal quality of the first public network cell is greater than or equal to a second preset bias; or, the signal quality of the high-speed rail cell is greater than or equal to a third signal quality threshold.

[0121] In some embodiments, the biases (the first preset bias, the second preset bias, and the third preset bias) and the signal quality (the first signal quality, the second signal quality, and the third signal quality threshold) in the present application can be indicated by metrics such as reference signal receiving power (RSRP) or signal to interference plus noise ratio (SINR). For example, when the signal quality is RSRP, the first preset bias is 5 dB; when the signal quality is SINR, the first preset bias is 3 dB.

[0122] In this way, the terminal device can select a high-speed rail cell according to the signal energy coverage of the high-speed rail private network and the public network. When there is no public network cell available, if the energy of the currently camped first public network cell is low, and if there is a high-speed rail cell with relatively better energy, the terminal device can also select the high-speed rail cell for camping to improve the user experience of public users.

[0123] As Figure 7 As shown in (a) of , it is a schematic diagram of a scenario where a public user around a high-speed rail private network escapes between the public network and the high-speed rail private network. Around a high-speed railway 71, there are a school area 72, a base station 73 of the high-speed rail private network, and a base station 74 of the public network. When the terminal device is moving in the school area 72: 1. Camp in the first high-speed rail cell under the base station 73 of the high-speed rail private network; 2. The terminal device identifies that the user is a public user around the high-speed rail private network; 3. Can select the first public network cell under the base station 74 with better energy for camping through the implementation method in step 603, that is, select the public network cell with better energy to escape; 4. When camping in the first public network cell, if the energy of the first public network cell is poor and there is no available public network for escape, the terminal device can select a private network cell with better energy under the base station 73 of the high-speed rail private network for escape.

[0124] As Figure 7As shown in (b) of , it is a schematic diagram of an escape scenario between a public user public network and a high-speed rail private network around the high-speed rail private network. Around a high-speed railway 71, there are a school area 72, a base station 73 of the high-speed rail private network, and a base station 74 of the public network. When the terminal device is active in the school area 72: 1. It stays in the first high-speed rail cell under the base station 73 of the high-speed rail private network; 2. The terminal device identifies that the user is a public user around the high-speed rail private network; 3. The signal quality of the terminal device under the first high-speed rail cell is less than or equal to the first signal quality threshold; 4. The terminal device reselects or re-establishes to the first public network cell under the base station 74 through background search, ANR measurement, etc. for escape.

[0125] As Figure 8 shown is a schematic flowchart of a cell selection method provided by an embodiment of the present application, and this method includes the following processes.

[0126] 801. The terminal device stays in the first high-speed rail cell according to the traditional method.

[0127] For the implementation of step 801, refer to the implementation manner of step 601.

[0128] 802. The terminal device identifies that the user is a public user around the high-speed rail private network.

[0129] For the implementation of step 802, refer to the implementation manner of step 602.

[0130] 803. In the case where the terminal device initiates any one of the processes of cell search, cell reselection, cell reestablishment, or cell redirection, search or measure available public network frequency points. If there is a first public network cell in the public network whose signal quality meets the first condition, stay in the first public network cell.

[0131] That is to say, if the terminal device initiates any one of the processes of cell search, cell reselection, cell reestablishment, or cell redirection, it can preferentially search for available public network frequency points / public frequency points / public network cells / public cells. For example, when a first public network cell that meets the first condition is searched, an RRC connection request is sent to the base station of the first public network cell to stay in the first public network cell.

[0132] Exemplarily, multiple frequency point information is recorded in the historical record of the terminal device. The terminal device can sequentially attempt to stay in the cells corresponding to these frequency point information and receive SIB1. If the terminal device determines that the currently attempted cell to stay in is a high-speed rail cell according to SIB1, the terminal device determines not to stay in this high-speed rail cell and continues to attempt to stay in the next cell. If the terminal device determines that the currently attempted cell to stay in is a public network cell according to SIB1, the terminal device measures the signal quality of this public network cell. In this way, the first public network cell whose signal quality meets the first condition can be selected from the public network and stay in this first public network cell.

[0133] Alternatively, a frequency point library may exist in the terminal device. The frequency point library may include the frequency points recorded by the terminal device during historical cell searches, and store the flag indicating whether the frequency point is a public network frequency point. When the terminal needs to initiate any one of the processes of cell search, cell reselection, cell reconstruction, or cell redirection, it may search for public network frequency points according to the records in the frequency point library, select a first public network cell whose signal quality meets the first condition from the public network, and camp on the first public network cell.

[0134] In this way, it is equivalent that the present application can select high-speed rail cells and public network cells according to the principle of dedicated private network. When the user is a public user around the high-speed rail, the public network cell is preferentially selected for camping, which can avoid potential problems such as high-speed rail "island cells" and "tidal load", and provide a better cell selection method for public users before the energy of the camped cell deteriorates. At the same time, it can balance the loads of high-speed rail base stations and public network base stations, and improve the user experience of high-speed rail users and public users.

[0135] Step 803 may occur in the RRC layer of the UE. Figure 8 Taking the terminal device as an example of the UE.

[0136] Then, step 804 or step 805 may be executed.

[0137] 804. When the terminal device escapes from the first public network cell to the second high-speed rail cell, it initiates a background search in the idle state or non-active state, and selects a second public network cell that meets the first condition for camping.

[0138] For example, when the terminal device drops a call or has a poor network speed when camping on the first public network cell, it reselects or reconstructs to the second high-speed rail cell. At this time, similar to the implementation in step 603, a periodic background search is initiated in the idle state or non-active state. If there is a second public network cell that meets the first condition in the public network, camp on the second public network cell.

[0139] 805. When the terminal device escapes from the first public network cell to the second high-speed rail cell, it initiates ANR measurement in the connected state, and selects a second public network cell that meets the first condition for camping.

[0140] For example, when the terminal device drops a call or has a poor network speed when camping on the first public network cell, it reselects or reconstructs to the second high-speed rail cell. At this time, similar to the implementation in step 603, ANR measurement is initiated in the connected state, and the public network frequency points recorded in the history are preferentially measured. If there is a second public network cell that meets the first condition in the public network, an RRC connection request is sent to the base station of the second public network cell to camp on the second public network cell.

[0141] Alternatively, after step 803, the terminal device can initiate a periodic background search in the idle state or non-active state to search for available public network frequency points / cells in the vicinity, and initiate reselection to the public network frequency points / cells; or, the terminal device can, in the connected state, search for public network frequency points / cells through ANR measurement and autonomously re-establish connection to the public network frequency points / cells. In this way, the terminal device can provide a better cell selection method for public users before the energy of the resident cell deteriorates.

[0142] Step 803 can occur in the RRC layer and physical layer of the UE.

[0143] Such as Figure 9 shown is a schematic flowchart of a cell selection method provided by an embodiment of the present application, and this method includes the following processes.

[0144] 901. The terminal device resides in the first high-speed rail cell in the traditional manner.

[0145] For the implementation of step 901, reference can be made to the implementation manner of step 601.

[0146] 902. The terminal device identifies that the user is a public user around the high-speed rail private network.

[0147] For the implementation of step 902, reference can be made to the implementation manner of step 602.

[0148] Steps 901 and 902 can occur in the RRC layer of the UE, Figure 9 where the terminal device is taken as an example of the UE.

[0149] 903. When the load of the first high-speed rail cell is in the first load state, the terminal device initiates a background search or initiates automatic neighbor relation measurement. If there is a first public network cell in the public network whose signal quality meets the first condition, the terminal device resides in the first public network cell.

[0150] In some embodiments, when the terminal device is in the idle state or connected state, the terminal device can select to reside in a high-speed rail cell or a public network cell according to the load condition of the currently resident first high-speed rail cell.

[0151] Among them, the first load state is a high load state. If the load of the terminal device in the first high-speed rail cell is in a high load state, it can actively initiate a background search or ANR measurement, and preferentially search for public network cells under public network frequency points. If there is a first public network cell in the public network whose signal quality meets the first condition, initiate a reselection or re-establishment process to the base station of the first public network cell to reselect or re-establish connection to the first public network cell.

[0152] In some embodiments, the load state of the high-speed rail community can be identified according to the operation rules of the high-speed rail. For example, in the time period when the high-speed rail is not in operation or the number of operations is small or the high-speed rail does not pass through the high-speed rail dedicated network, the load state of the high-speed rail community is considered to be a low load state. In the time period when the high-speed rail is in operation or the number of operations is large or the high-speed rail passes through the high-speed rail dedicated network, the load state of the high-speed rail community is considered to be a high load state.

[0153] Among them, the high-speed rail operation rules can be identified by the high-speed rail base station of the first high-speed rail cell currently stationed and notified to the terminal device.

[0154] In this way, for the terminal device, the terminal device can dynamically select the high-speed rail cell or the public network cell at a smaller time interval.

[0155] In some embodiments, the load status of the high-speed rail cell can be identified by the terminal device detecting regular congestion procedures over a period of time to identify the load size of the first high-speed rail cell.

[0156] For example, if the terminal device detects that multiple retransmission events occur within a period of time and the number of retransmissions each time reaches a preset number, or multiple events occur in which the packet loss rate is less than or equal to the packet loss rate threshold, the terminal device considers that the load state of the first high-speed rail cell is a high load state, otherwise, it is a low load state.

[0157] 904. When the load of any high-speed railway cell is in the second load state, the terminal device initiates a background search or initiates an ANR measurement. If there is a second high-speed railway cell in the high-speed railway private network whose signal quality meets the third condition, the terminal device resides in the second high-speed railway cell.

[0158] The second load state is a low load state.

[0159] In some embodiments, the third condition includes at least one of the following: the difference between the signal quality of the high-speed rail cell and the signal quality of the first high-speed rail cell is greater than or equal to a third preset bias; or, the signal quality of the high-speed rail cell is greater than or equal to a fourth signal quality threshold.

[0160] For example, when the terminal device resides in the first public network cell, if the terminal device determines that any high-speed rail cell under the high-speed rail base station is in a low-load state, it can actively initiate a background search or ANR measurement, and prioritize searching the high-speed rail private network frequency, determine the second high-speed rail cell that meets the third condition, and initiate a reselection or reconstruction process to the base station of the second high-speed rail cell to reselect or rebuild to the second high-speed rail cell.

[0161] Steps 903 and 904 may occur at the RRC and physical layers of the UE.

[0162] like Figure 10The figure shows a schematic diagram of the load situation of high-speed rail cells when the public network intrusion is serious. The horizontal axis represents time, and the vertical axis represents the load. In the non-meeting scenario, when no high-speed rail passes through the high-speed rail private network, the number of public users in the high-speed rail cell is approximately 200 (such as Figure 10 shown as 239), which means that 200 public users occupy the high-speed rail private network at this time. When the high-speed rail passes through the high-speed rail private network, the peak number of public users in the high-speed rail cell can increase to 700 (such as Figure 10 shown as 717 in), resulting in a relatively high load on the high-speed rail private network. The data service experience of both public users and private network users will be affected, and problems such as information sending failure or web page lag are likely to occur, and the user experience is poor.

[0163] If the method of dynamically selecting to reside in a high-speed rail cell or a public network cell according to the load situation of the currently resident high-speed rail cell in this application is used, it is possible to preferentially select the public network cell when the high-speed rail cell has a high load, which can avoid problems such as "high-speed rail isolated cells" and "tidal loads". At the same time, when the high-speed rail cell has a low load, preferentially select the high-speed rail cell with better energy, and better services and faster speeds can be enjoyed on the high-speed rail cell with better energy. In addition, when the high-speed rail base station has a high load, the public network cell can be preferentially selected, and when the high-speed rail base station has a low load, the high-speed rail cell can be preferentially selected, improving the user experience of public users. The embodiments of this application can also balance the loads of high-speed rail base stations and public network base stations, and at the same time improve the user experiences of high-speed rail users and public network users.

[0164] It can be understood that, in order to implement the functions in the above embodiments, the terminal device includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should easily realize that, combining the units and method steps of each example described in the embodiments disclosed in this application, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application scenarios and design constraints of the technical solution.

[0165] Figure 11 and Figure 12 are schematic diagrams of possible communication devices provided by the embodiments of this application. These communication devices can be used to implement the functions of the terminal device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. In the embodiments of this application, the communication device can be the terminal 120 as shown in Figure 1 , or can also be a module (such as a chip) applied to the terminal.

[0166] As shown in Figure 11 , the communication device 110 includes a processing unit 1110 and a transceiver unit 1120. The communication device 110 is used to implement the functions of the terminal device in the method embodiments shown in the above Figures 5 to 9 .

[0167] When the communication device 110 is used to implement Figure 5 , Figure 6 , Figure 8 and Figure 9 the functions of the sending end in the method embodiments shown: The processing unit 1110 can be used, for example, to identify that the user is a public user around the high-speed rail private network; determine the first public network cell that meets the first condition in the public network cell; camp on the first high-speed rail cell; camp on the first public network cell. The transceiver unit 1120 can be used to receive system messages; send background search requests; send ANR measurement requests; receive background search results; receive ANR measurement results, etc.

[0168] For a more detailed description of the above-mentioned processing unit 1110 and transceiver unit 1120, reference can be made to Figures 5 to 9 the relevant descriptions in the method embodiments shown.

[0169] As Figure 12 shown, the communication device 1200 includes a processor 1210 and an interface circuit 1220. The processor 1210 and the interface circuit 1220 are coupled to each other. It can be understood that the interface circuit 1220 can be a transceiver or an input / output interface. Optionally, the communication device 1200 may further include a memory 1230 for storing instructions executed by the processor 1210 or storing input data required for the processor 1210 to run instructions or storing data generated after the processor 1210 runs instructions.

[0170] When the communication device 1200 is used to implement Figure 5 , Figure 6 , Figure 8 and Figure 9 the method shown, the processor 1210 is used to implement the functions of the above-mentioned processing unit 1110, and the interface circuit 1220 is used to implement the functions of the above-mentioned transceiver unit 1120.

[0171] When the above communication device is a chip applied to a terminal device to execute the sending function, the chip of the terminal device implements the sending function of the terminal device in the above method embodiments. The chip for the sending function sends information to the receiving end. It can be understood that the information is first sent to other modules (such as a radio frequency module or an antenna) in the terminal device, and then these modules send it to the receiving end.

[0172] When the above communication device is a chip applied to a terminal device to execute the receiving function, the chip of the terminal device implements the receiving function of the terminal device in the above method embodiments. The chip for the receiving function receives information from the sending end. It can be understood that the information is first received by other modules (such as a radio frequency module or an antenna) in the terminal device, and then these modules send it to the chip of the terminal device.

[0173] In this application, when entity A sends information to entity B, it can be that A directly sends it to B, or A indirectly sends it to B through other entities. Similarly, when entity B receives information from entity A, it can be that entity B directly receives the information sent by entity A, or entity B indirectly receives the information sent by entity A through other entities. Here, entity A and B can be RAN nodes or terminals, or modules inside RAN nodes or terminals. The sending and receiving of information can be information interaction between a RAN node and a terminal. For example, information interaction between a base station and a terminal; the sending and receiving of information can also be information interaction between two RAN nodes. For example, information interaction between a CU and a DU; the sending and receiving of information can also be information interaction between different modules within a device. For example, information interaction between a terminal chip and other modules of the terminal, or information interaction between a base station chip and other modules in the base station.

[0174] It can be understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0175] The method steps in the embodiments of this application can be implemented in hardware or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, removable hard disks, compact disc read-only memories (CD-ROMs), or any other form of storage medium well-known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also exist as discrete components in a base station or a terminal.

[0176] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0177] In various embodiments of the present application, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0178] In the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. In the written description of the present application, the character " / " generally means that the associated objects before and after are in an "or" relationship. "Including at least one of A, B, and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B, and C.

[0179] It can be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The magnitudes of the serial numbers of the above processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

Claims

1. A cell selection method, characterized in that, the method includes: Residing in a first high-speed rail cell under a high-speed rail private network; When the user is a public user around the high-speed rail private network, if there is a first public network cell in the public network whose signal quality meets the first condition, then reside in the first public network cell.

2. The method according to claim 1, characterized in that, When it is sensed within a preset time period that the moving speed of the user is less than or equal to the speed threshold, if the cell where the user resides is a high-speed rail cell, the user is a public user around the high-speed rail private network.

3. The method according to claim 1, characterized in that, When the residence time in the first high-speed rail cell is greater than or equal to the time threshold and it is sensed that the moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network.

4. The method according to claim 1, characterized in that, When it is recognized within a preset time period that the cell where the user resides is a high-speed rail cell and it is sensed that the moving speed of the user is less than or equal to the speed threshold, the user is a public user around the high-speed rail private network; wherein, the preset time period includes at least one of the following time periods: a time period when the high-speed rail is not in operation, a time period when the number of high-speed rail operations is less than or equal to a preset number of times, or a time period when the high-speed rail does not pass through the first high-speed rail cell.

5. The method according to any one of claims 1-4, characterized in that, The step of if there is a first public network cell in the public network whose signal quality meets the first condition, then reside in the first public network cell includes: Initiating a background search. If there is a first public network cell in the public network whose signal quality meets the first condition, then initiate a cell reselection to the first public network cell and reside in the first public network cell; Or, initiating an automatic neighbor cell relation measurement. If there is a first public network cell in the public network whose signal quality meets the first condition, then initiate a cell reconstruction to the first public network cell and reside in the first public network cell.

6. The method according to claim 5, characterized in that, Before initiating the background search or initiating the automatic neighbor cell relation measurement, the method further includes: Determining that the signal quality of the first high-speed rail cell is less than or equal to the first signal quality threshold.

7. The method according to claim 5 or 6, characterized in that, The method further includes: When the signal quality of the first public network cell is less than or equal to the second signal quality threshold and it is not possible to switch or reselect to other public network cells, initiate a background search or initiate an automatic neighbor cell relation measurement; If there is a second high-speed rail cell in the high-speed rail private network that meets the second condition, then reside in the second high-speed rail cell.

8. The method according to any one of claims 1-4, characterized in that, The step of if there is a first public network cell in the public network whose signal quality meets the first condition, then reside in the first public network cell includes: In the case of initiating any one of the processes of cell search, cell reselection, cell reconstruction, or cell redirection, search for or measure available public network frequency points. If there is a first public network cell in the public network whose signal quality meets the first condition, camp on the first public network cell.

9. The method according to any one of claims 1-4, characterized in that the step of camping on the first public network cell if there is a first public network cell in the public network whose signal quality meets the first condition includes: When the load of the first high-speed rail cell is in the first load state, initiate background search or initiate automatic neighbor cell relation measurement. If there is a first public network cell in the public network whose signal quality meets the first condition, camp on the first public network cell.

10. The method according to claim 9, characterized in that the method further includes: When the load of any high-speed rail cell is in the second load state, initiate background search or initiate automatic neighbor cell relation measurement. If there is a second high-speed rail cell in the high-speed rail private network whose signal quality meets the third condition, camp on the second high-speed rail cell.

11. The method according to claim 5 or 8 or 9, characterized in that the first condition includes at least one of the following: The difference between the signal quality of the public network cell and the signal quality of the first high-speed rail cell is greater than or equal to a first preset offset; or, the signal quality of the public network cell is greater than or equal to a second signal quality threshold.

12. The method according to claim 7, characterized in that the second condition includes at least one of the following: The difference between the signal quality of the high-speed rail cell and the signal quality of the first public network cell is greater than or equal to a second preset offset; or, the signal quality of the high-speed rail cell is greater than or equal to a third signal quality threshold.

13. The method according to claim 10, characterized in that the third condition includes at least one of the following: The difference between the signal quality of the high-speed rail cell and the signal quality of the first high-speed rail cell is greater than or equal to a third preset offset; or, the signal quality of the high-speed rail cell is greater than or equal to a fourth signal quality threshold.

14. A communication device, characterized in that it includes: A camping module for camping on a first high-speed rail cell under a high-speed rail private network; A selection module for, when the user is a public user around the high-speed rail private network, camping on the first public network cell if there is a first public network cell in the public network whose signal quality meets the first condition.

15. A communication device, characterized in that it includes a module for executing the method according to any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that computer instructions are stored in the computer-readable storage medium. When the computer instructions run on a communication device, the communication device is caused to execute the method according to any one of claims 1-13.

17. A computer program product, characterized in that it includes computer instructions. When the computer instructions run on a communication device, the communication device is caused to execute the method according to any one of claims 1-13.

18. A chip, Characterized in that, The chip stores computer-executable instructions, and when the computer-executable instructions are run, the method according to any one of claims 1-13 is executed.

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