Cell selection method, device, equipment and storage medium

Abstract

A cell selection method, device, equipment and storage medium relate to the field of communication technology. The method includes: the terminal device determines the position relationship between the terminal device and the first network device according to the first information; when the position relationship meets the first condition, the terminal device selects the cell corresponding to the first network device as the resident cell. A method for selecting a resident cell based on the position relationship between the terminal device and the network device is provided. Since the difference in the position relationship between the terminal device and different network devices is relatively obvious, a more accurate reference can be provided for the terminal device to select a resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when the cell is selected or reselected as the target cell, the access efficiency of the terminal device during subsequent random access and the switching efficiency during subsequent cell switching are also improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a cell selection method, apparatus, device and storage medium. Background Art

[0002] 3GPP (3rd Generation Partnership Project) introduced NTN (Non Terrestrial Network) technology in the 5G NR (New Radio) system.

[0003] NTN generally uses satellite communications to provide communication services to ground users. Compared with ground cellular network communication systems, NTN systems have many unique advantages. First, the NTN system is not limited by the user's geographical area. Since a satellite can cover a large area of ​​land and the satellite can orbit the earth, theoretically every corner of the earth can be covered by the NTN system. Secondly, the NTN system has great social value. The NTN system can cover remote mountainous areas, poor and backward countries or regions at a low cost, so that people in these areas can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital divide with developed areas and promoting the development of these areas. Thirdly, the NTN system has a long distance, and the communication cost does not increase significantly as the communication distance increases. Finally, the NTN system is highly stable and is not limited by natural disasters.

[0004] In NTN technology, since the spatial path loss between UE (User Equipment) and satellite does not vary significantly with distance, further research is needed on how UE selects a suitable cell to reside in. Summary of the invention

[0005] The embodiments of the present application provide a cell selection method, apparatus, device and storage medium. The technical solution is as follows:

[0006] On the one hand, an embodiment of the present application provides a cell selection method, which is applied to a terminal device, and the method includes:

[0007] Determine a positional relationship between the terminal device and the first network device according to first information, where the first information includes device information of the first network device;

[0008] When the position relationship satisfies a first condition, a cell corresponding to the first network device is selected as a resident cell.

[0009] On the other hand, an embodiment of the present application provides a cell selection method, which is applied to a network device, and the method includes:

[0010] Sending first information to a terminal device, wherein the first information includes device information of a first network device, and the first information is used for the terminal device to determine a position relationship between the terminal device and the first network device, and the position relationship is used for the terminal device to select a resident cell.

[0011] On the other hand, an embodiment of the present application provides a cell selection device, which is applied to a terminal device, and the device includes:

[0012] a relationship determination module, configured to determine a position relationship between the terminal device and the first network device according to first information, wherein the first information includes device information of the first network device;

[0013] The cell selection module is used to select the cell corresponding to the first network device as the resident cell when the position relationship meets the first condition.

[0014] On the other hand, an embodiment of the present application provides a cell selection device, which is applied to a network device, and the device includes:

[0015] An information sending module is used to send first information to a terminal device, wherein the first information includes device information of a first network device, and the first information is used for the terminal device to determine a position relationship between the terminal device and the first network device, and the position relationship is used for the terminal device to select a resident cell.

[0016] In another aspect, an embodiment of the present application provides a terminal device, the terminal device comprising a processor and a transceiver connected to the processor; wherein:

[0017] The processor is configured to determine a position relationship between the terminal device and a first network device according to first information, wherein the first information includes device information of the first network device;

[0018] The processor is further configured to select a cell corresponding to the first network device as a resident cell when the position relationship satisfies a first condition.

[0019] In another aspect, an embodiment of the present application provides a network device, the network device comprising a processor and a transceiver connected to the processor; wherein:

[0020] The transceiver is used to send first information to the terminal device, wherein the first information includes device information of the first network device, and the first information is used for the terminal device to determine the position relationship between itself and the first network device, and the position relationship is used for the terminal device to select a resident cell.

[0021] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a terminal device to implement the cell selection method on the terminal device side.

[0022] On the other hand, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a network device to implement the cell selection method on the network device side.

[0023] On the other hand, an embodiment of the present application provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a terminal device, it is used to implement the cell selection method on the terminal device side as described above.

[0024] On the other hand, an embodiment of the present application provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a network device, it is used to implement the cell selection method on the network device side as described above.

[0025] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0026] The terminal device determines the positional relationship between the terminal device and the network device according to the device information of the network device, and then selects the cell corresponding to the network device as the resident cell when the positional relationship meets certain conditions, thereby providing a method for selecting a resident cell based on the positional relationship between the terminal device and the network device. In addition, in the embodiment of the present application, since the difference in the positional relationship between the terminal device and different network devices is relatively obvious, even if there are measurement and calculation errors when the terminal device determines the positional relationship between the terminal device and the network device, it can also clearly reflect whether the terminal device is closer to the center of the service range of the network device or closer to the edge of the service range of the network device, so that a more accurate reference can be provided for the terminal device to select the resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when the cell is selected or the target cell is reselected, the technical solution provided in the embodiment of the present application can improve the accuracy of the resident cell selection result, and also avoid the state of no network service or poor network service caused by the inaccurate selection of the resident cell by the terminal device, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when performing random access later, or improving the switching efficiency of the terminal device when performing cell switching later.

[0027] In addition, in the embodiment of the present application, there are multiple ways for the terminal device to obtain the device information of the network device, for example, pre-configured in the USIM card, carried in the system message or carried in the RRC message, thereby improving the flexibility of the terminal device to obtain the device information of the network device. Moreover, since the device information of the network device can include the device information of all network devices in the communication system, the terminal device only needs to obtain the device information of the network device once and store it, which can be used multiple times in the subsequent random access process or cell switching process, avoiding the need for the terminal device to obtain the device information of the network device multiple times, and reducing the processing overhead of the terminal device.

[0028] In addition, in the technical solution provided in the embodiment of the present application, when the terminal device selects the resident cell, it can simultaneously consider the positional relationship between the terminal device and the network device, and the channel quality measurement result of the cell corresponding to the network device. In this case, the terminal device determines the resident cell only when the positional relationship meets certain conditions and the channel quality measurement result meets another condition. Due to the consideration of a variety of reference factors, the determination of the positional relationship provided in the embodiment of the present application can make up for the error of the channel quality measurement result, solve the problem of inaccurate resident cell selection in the related art, and further improve the accuracy of the resident cell selection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of a network architecture provided by another embodiment of the present application;

[0031] Figure 3 is a schematic diagram of a network architecture provided by another embodiment of the present application;

[0032] Figure 4 is a flowchart of a cell selection method provided by an embodiment of the present application;

[0033] Figure 5 is a flowchart of a cell selection method provided by another embodiment of the present application;

[0034] Figure 6 is a flowchart of a cell selection method provided by yet another embodiment of the present application;

[0035] Figure 7 is a flowchart of a cell selection method provided by another embodiment of the present application;

[0036] Figure 8 is a flow chart of a method for determining a position relationship provided by an embodiment of the present application;

[0037] Fig. 9 is a schematic diagram of a method for determining a position relationship provided by an embodiment of the present application;

[0038] Fig.10 is a flow chart of a method for determining a position relationship provided by another embodiment of the present application;

[0039] Fig.11 is a schematic diagram of a method for determining a position relationship provided by another embodiment of the present application;

[0040] Fig.12 is a flow chart of a method for determining a position relationship provided by another embodiment of the present application;

[0041] Fig.13 is a schematic diagram of a method for determining a position relationship provided in yet another embodiment of the present application;

[0042] Fig.14 is a block diagram of a cell selection device provided by an embodiment of the present application;

[0043] Fig.15 is a block diagram of a cell selection device provided by another embodiment of the present application;

[0044] Fig.16 is a block diagram of a cell selection device provided by another embodiment of the present application;

[0045] Fig.17 is a structural block diagram of a terminal device provided by an embodiment of the present application;

[0046] Fig.18 It is a structural block diagram of a network device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0048] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0049] Please refer to Figure 1 , which shows a schematic diagram of a network architecture provided by an embodiment of the present application. The network architecture may include: a network device 10 and a terminal device 20.

[0050] The network device 10 is a device for providing wireless communication services to the terminal device 20. The network device 10 and the terminal device 20 can establish a connection through an air interface, so as to communicate through the connection, including the interaction of signaling and data. There can be multiple network devices 10, and two adjacent network devices 10 can also communicate through wired or wireless means. The terminal device 20 can switch between different network devices 10, that is, establish connections with different network devices 10.

[0051] In one example, if Figure 2 As shown, taking the NTN network as an example, the network device 10 in the NTN network can be a satellite 11. A satellite 11 can cover a certain range of ground area and provide wireless communication services for the terminal devices 20 in the ground area. In addition, the satellite 11 can orbit around the earth, and by deploying multiple satellites 11, communication coverage of different areas on the earth's surface can be achieved.

[0052] Compared with the terrestrial cellular communication network, satellite communication has many unique advantages. First, satellite communication is not restricted by the user's geographical location. For example, general terrestrial communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be set up or where communication coverage is not provided due to sparse population. For satellite communication, since one satellite can cover a large area of ​​land, and the satellite can orbit around the earth, in theory, every corner of the earth can be covered by satellite communication. Secondly, satellite communication has great social value. Satellite communication can be covered at a low cost in remote mountainous areas, poor and backward countries or regions, so that people in these areas can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital divide with developed areas and promoting the development of these areas. Thirdly, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases; finally, satellite communication has high stability and is not restricted by natural disasters.

[0053] According to the different orbital altitudes, communication satellites are divided into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Earth Orbit) satellites, HEO (High Elliptical Orbit) satellites, etc. At present, the main research is on LEO and GEO.

[0054] 1. LEO

[0055] The altitude of low-orbit satellites ranges from 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirement for user terminals is not high.

[0056] 2. GEO

[0057] The geosynchronous orbit satellite has an orbit altitude of 35786km and a rotation period around the earth of 24 hours. The signal propagation delay of single-hop communication between users is generally 250ms.

[0058] In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0059] In another example, Figure 3 As shown, taking a cellular communication network as an example, the network device 10 in the cellular communication network may be a base station 12. The base station 12 is a device deployed in an access network to provide wireless communication functions for the terminal device 20. The base station 12 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems that use different wireless access technologies, the names of devices with network device functions may be different. For example, in a 5G NR (New Radio) system, it is called gNodeB or gNB. With the evolution of communication technology, the name "base station" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 20 are collectively referred to as network devices.

[0060] In addition, the terminal device 20 involved in the embodiment of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile station (MS), terminal device, etc. For the convenience of description, in the embodiment of the present application, the above-mentioned devices are collectively referred to as terminal devices.

[0061] In addition, in the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand their meanings.

[0062] The technical solution provided in the embodiment of the present application can be applicable to an NTN system as well as a cellular network system.

[0063] In a cellular network system, a basic condition for a terminal device to stay in a cell normally is that the cell can provide a service level that meets the S criterion. That is, only when the measurement and evaluation results of a cell meet the S criterion can it become the target cell for cell selection and reselection. The S criterion stipulates:

[0064] Srxlev>0 and Squal>0

[0065] The expressions of Srxlev and Squal are as follows:

[0066] Srxlev=Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation-Qoffsettemp

[0067] Squal=Qqualmeas-(Qqualmin+Qqualminoffset)-Qoffsettemp

[0068] The meanings of the various parameters in the above expressions are explained as follows:

[0069] Qrxlevmeas is the RSRP (Reference Signal Receiving Power) actually measured and calculated by the terminal device.

[0070] Qqualmeas is the RSRQ (Reference Signal Receiving Quality) actually measured and calculated by the terminal device.

[0071] Qrxlevmin is the minimum receiving power RSRP required by the network device.

[0072] Qqualmin is the minimum signal quality RSRQ required by the network device.

[0073] Qrxlevminoffset and Qqualminoffset are offsets for preventing the ping-pong effect between two PLMNs (Public Land Mobile Network) due to radio environment fluctuations. That is, Qrxlevminoffset and Qqualminoffset are the offsets of Qrxlevmin and Qqualmin that need to be considered when the terminal device resides on a VPLMN (Visited Public Land Mobile Network) and periodically searches for a higher priority PLMN.

[0074] Pcompensation is power compensation, for example, when the maximum transmission power allowed by the network equipment is greater than the maximum uplink transmission power determined by the terminal equipment's own capabilities, power compensation is caused by the low power of the terminal equipment.

[0075] Qoffsettemp is only used in special scenarios and is not applicable in normal situations, such as the "Chiba Problem" scenario.

[0076] Since RSRP represents the reference signal received power, Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset) indicates the downlink received signal quality, and Pcompensation indicates the uplink transmitted signal quality, Srxlev is an evaluation value relative to RSRP that is evaluated by comprehensively considering the uplink and downlink signal power strengths and can represent the quality of service that the cell can provide. RSRQ, as a signal quality metric that comprehensively considers RSRP and total received power (including interference and noise effects), can provide a more reliable evaluation basis than RSRP, so Squal also represents the cell service level. Srxlev and Squal can be used to more comprehensively evaluate the quality of service that a cell can provide. Therefore, the S criterion becomes the basic evaluation condition for whether a cell can reside.

[0077] Since the spatial path loss of the terrestrial cellular network varies greatly, even if there are certain measurement errors in the process of measuring RSRP and RSRQ of the terminal device, as long as the measured values ​​of RSRP and RSRQ are greater than a certain threshold value, they can still represent the signal quality from the terminal device to the network device and can be used for normal connection establishment and data transmission. However, in the NTN system, due to the long distance between network devices such as satellites and terminal devices, the spatial path loss changes with different locations within the coverage of the network device service are not significant. At this time, if only the error of the RSRP / RSRQ measurement value is considered, the location of the terminal device within the coverage of the network device service can no longer be accurately described. For example, assuming that for different locations within the service coverage of the network device, the RSRP value range that the terminal device can measure is -4dB to 4dB. At this time, if the RSRP measurement error is 4dB, and the RSRP value actually measured by the terminal device is 0, then the terminal device will not be able to determine whether it is close to the center of the network device or close to the edge of the network device. In this case, if the S criterion for cell selection in the cellular network system is still used, the terminal device may make an incorrect judgment when selecting a cell to reside in due to the RSRP measurement error, resulting in subsequent cell access failures and other problems, reducing cell access efficiency.

[0078] Based on this, the embodiments of the present application provide a method, device, equipment and storage medium for selecting a cell. In the technical solution provided in the embodiments of the present application, the terminal device determines the positional relationship between the terminal device and the network device according to the device information of the network device, and then selects the cell corresponding to the network device as the resident cell when the positional relationship meets certain conditions, thereby providing a specific method for selecting a resident cell. In addition, in the embodiments of the present application, since the difference in the positional relationship between the terminal device and different network devices is relatively obvious, even if there are measurement and calculation errors when the terminal device determines the positional relationship between the terminal device and the network device, it can also more clearly reflect whether the terminal device is closer to the center of the service range of the network device or closer to the edge of the service range of the network device, so that a more accurate reference can be provided for the terminal device to select a resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when selecting or reselecting a target cell, the technical solution provided in the embodiment of the present application can improve the accuracy of the resident cell selection result, thereby avoiding the state of no network service or poor network service caused by the terminal device due to inaccurate resident cell selection, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device during subsequent random access, or improving the switching efficiency of the terminal device during subsequent cell switching.

[0079] In addition, in the embodiment of the present application, there are multiple ways for the terminal device to obtain the device information of the network device, for example, pre-configured in the USIM card, carried in the system message or carried in the RRC message, thereby improving the flexibility of the terminal device to obtain the device information of the network device. Moreover, since the device information of the network device can include the device information of all network devices in the communication system, the terminal device only needs to obtain the device information of the network device once and store it, which can be used multiple times in the subsequent random access process or cell switching process, avoiding the need for the terminal device to obtain the device information of the network device multiple times, and reducing the processing overhead of the terminal device.

[0080] In addition, in the technical solution provided in the embodiment of the present application, when the terminal device selects the resident cell, it can simultaneously consider the positional relationship between the terminal device and the network device, and the channel quality measurement result of the cell corresponding to the network device. In this case, the terminal device determines the resident cell only when the positional relationship meets certain conditions and the channel quality measurement result meets another condition. Due to the consideration of a variety of reference factors, the determination of the positional relationship provided in the embodiment of the present application can make up for the error of the channel quality measurement result, solve the problem of inaccurate resident cell selection in the related art, and further improve the accuracy of the resident cell selection result.

[0081] The technical solution of the present application will be introduced and explained below in conjunction with several exemplary embodiments.

[0082] Please refer to Figure 4 , which shows a flowchart of a cell selection method provided by an embodiment of the present application, which can be applied to Figures 1 to 3 In the network architecture shown, the method may include the following steps (410-420):

[0083] Step 410: The terminal device determines a positional relationship between the terminal device and the first network device according to the first information.

[0084] After obtaining the first information, the terminal device can determine the positional relationship between the terminal device and the first network device through measurement, calculation, etc. according to the first information. The embodiment of the present application does not limit the specific form of the positional relationship. Optionally, in the NTN system, the positional relationship can be expressed as the distance between the terminal device and the first network device, or as the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line, or as the distance between the terminal device and the ground coverage center point of the first network device.

[0085] The first information refers to the device information of the network device, which is used for the terminal device to measure the position relationship between the terminal device and the network device during the process of cell selection or reselection of the target cell, so as to determine the network service level of the network device. Optionally, in a terrestrial cellular network system, the device information of the network device includes but is not limited to: the location information of the network device, the coverage information of the network device, and the service beam information of the network device; in an NTN system, when the network device can be implemented as a satellite, the device information of the network device includes but is not limited to: the ephemeris information of the network device, the ground coverage center point of the network device, the service beam information of the network device, and the coverage information of the network device.

[0086] In the embodiment of the present application, the first information includes device information of the first network device, wherein the first network device is a network device that can currently provide network services to the terminal device. For the determination process of the first network device, please refer to the following Figure 6The optional embodiments shown are not described in detail here. Optionally, in addition to the device information of the first network device, the first information may also include the device information of other network devices other than the first network device. For example, the first information may include the device information of all network devices in the communication system. Since the location and activity range of the terminal device are uncertain, the network devices corresponding to the network services that it can receive are also uncertain. By including the information of all network devices in the first information, the embodiment of the present application can enable the terminal device to obtain the device information of the network devices corresponding to the network services that it can currently receive when it is in any position, so as to realize timely determination of the network service level of the network devices.

[0087] Optionally, the terminal device obtains the first information in various ways. In the embodiment of the present application, the first information can be pre-configured in the USIM (Universal Subscriber Identity Module) of the terminal device. For example, when the operator produces the USIM card, the first information can be pre-configured in the USIM so that the terminal device can directly obtain the first information when using the USIM card; or, the first information can be carried in a system message and sent to the terminal device. For example, the network device can pre-configure the first information, and then when broadcasting the system message to the terminal devices within its service range, the system message carries the first information, so that the terminal device obtains the first information; or, the first information can be carried in an RRC (Radio Resource Control) signaling and sent to the terminal device. For example, the network device can pre-configure the first information, and then when sending the RRC signaling to the terminal device that successfully accesses the network device, the RRC signaling carries the first information, so that the terminal device obtains the first information. The embodiment of the present application improves the flexibility of the terminal device in obtaining the first information by providing multiple ways to obtain the first information. Furthermore, since the first information may include the device information of all network devices in the communication system, after obtaining the first information, the terminal device may store the first information for multiple use in subsequent cell selection or target cell reselection, thereby avoiding the need for the terminal device to obtain the first information again each time the terminal device selects or reselects a target cell, thereby reducing the processing overhead of the terminal device.

[0088] Alternatively, if Figure 5As shown, before the above step 410, step 402 is also included: the network device sends the first information to the terminal device. Since the first information can be pre-configured by the network device, in this case, the network device needs to send the first information to the terminal device so that the terminal device obtains the first information. Optionally, when the terminal device is not connected to the network device, the network device can carry the first information in a system message; when the terminal device is connected to the network device, the network device can carry the first information in the system message or in the RRC signaling.

[0089] In one example, if Figure 6 As shown, before the above step 410, the following steps (404-406) are also included:

[0090] Step 404: The terminal device obtains the cell information of the first cell.

[0091] The first cell refers to a cell that can currently provide network services for the terminal device. In the embodiment of the present application, the first cell is used for the terminal device to select a resident cell. The terminal device can obtain the cell information of the first cell by measurement and other means at the current location. The cell information of a certain cell refers to the information used to uniquely identify the cell. Optionally, the cell information includes: PCI (Physical Cell Identity) and / or frequency information, that is, in the embodiment of the present application, the cell information can include only PCI; it can also include only frequency information; it can also include both PCI and frequency information. In actual application, when considering processing overhead and other reasons, only PCI or only frequency information can be used as cell information; when considering the accuracy of identifying a certain cell and other reasons, PCI and frequency information can be used as cell information at the same time, and the embodiment of the present application does not limit this.

[0092] Step 406: The terminal device determines the first network device from at least one network device according to the cell information of the cell corresponding to the at least one network device and the cell information of the first cell.

[0093] Optionally, the cell information of the cell corresponding to at least one network device can be carried in the first information. When the terminal device obtains the first information, the cell information of the cell corresponding to at least one network device is also obtained; it can also be a separate piece of information. In this case, the information can be pre-configured in the USIM card of the terminal device, or carried in the system message, or carried in the RRC signaling. In addition, the terminal device can obtain the information in the same way as the first information, or in a different way from the first information, and the embodiments of the present application do not limit this. Optionally, in order to avoid the terminal device from obtaining information multiple times and reduce the processing overhead of the terminal device, the at least one network device can be all the network devices in the communication system where the terminal device is located. In this case, the cell information of the cell corresponding to the at least one network device refers to the cell information corresponding to all network devices.

[0094] In an embodiment of the present application, the cell corresponding to at least one network device includes a first cell, and at least one network device includes a first network device. The terminal device obtains the cell information of the cell corresponding to at least one network device, and also obtains the correspondence between at least one network device and the cell, so that the terminal device can find the network device corresponding to the first cell, that is, the first network device, based on the obtained cell information of the first cell and the cell information of the cell corresponding to at least one network device, so as to complete the step of determining the first network device from at least one network device. Optionally, the cell information of the cell corresponding to at least one network device can be given in the form of a table, from which the cell identifier of a certain cell can be mapped to the corresponding network device.

[0095] Step 420: When the location relationship of the terminal device satisfies the first condition, the terminal device selects the cell corresponding to the first network device as the resident cell.

[0096] After the terminal device determines the positional relationship between it and the first network device, it can select a resident cell according to the positional relationship, and the resident cell refers to a candidate cell that the terminal device can access. Optionally, when the positional relationship satisfies the first condition, the terminal device selects the cell corresponding to the first network device as the resident cell. In the embodiment of the present application, the first condition can be pre-configured by the network device, or it can be pre-specified in the protocol, or it can be specifically determined by the terminal device according to the determination of the positional relationship. For example, assuming that the positional relationship is a distance, when the terminal device determines the distance between it and multiple network devices, multiple distances can be obtained. Then, the terminal device can determine the first condition according to the specific values ​​of the multiple distances, such as determining that the first condition is the maximum value, or determining that the first condition is a value within a certain value interval, or determining that the first condition is a value less than a certain threshold, so that according to the first condition, the terminal device can select a distance that satisfies the first condition from multiple distances, and determine that the cell corresponding to the network device corresponding to the distance that satisfies the first condition is the resident cell. Since there may be multiple network devices that can currently provide network services for the terminal device in actual applications, the terminal device determines the first condition, and the value of the first condition can be flexibly determined according to the actual scenario.

[0097] In one example, if Figure 7 As shown, the above method further includes the following steps (430-440):

[0098] Step 430: The terminal device obtains the channel quality measurement result of the cell corresponding to the first network device.

[0099] In the embodiment of the present application, the terminal device can measure and calculate the network service level of the cell that can currently provide network services for it. Optionally, the network service level can be represented by a channel quality measurement result. For example, the channel quality measurement result may include RSRP, RSRQ, SINR (Signal to Noise Ratio), RSSI (Received Signal Strength Indication), etc. The embodiment of the present application does not limit the specific content of the channel quality measurement result.

[0100] It should be noted that the embodiment of the present application does not limit the execution order of step 410 and step 430. In practical applications, step 410 may be executed first, step 430 may be executed first, or step 410 and step 430 may be executed simultaneously. Figure 7 The following description will be given by taking the execution of step 410 as an example.

[0101] Step 440: When the position relationship of the terminal device satisfies the first condition and the channel quality measurement result satisfies the second condition, the terminal device selects the cell corresponding to the first network device as the resident cell.

[0102] In order to make the selection of the resident cell more accurate, improve the access efficiency of the terminal device when performing random access subsequently, or improve the switching efficiency of the terminal device when performing cell switching, the terminal device can, on the basis that the positional relationship between the terminal device and the first network device satisfies the first condition, further select the cell corresponding to the first network device as the resident cell when the channel quality measurement result of the cell corresponding to the first network device satisfies the second condition.

[0103] The second condition may be pre-configured by the network device, may be pre-specified in the protocol, or may be specifically determined by the terminal device based on the channel quality measurement result actually obtained. The embodiment of the present application does not limit the specific determination method of the second condition. Optionally, the second condition includes: the channel quality measurement result satisfies the S criterion. For a detailed description of the S criterion, please refer to the above embodiment, which will not be repeated here.

[0104] One point that needs to be explained is that the first network device may include multiple network devices. For the convenience of description, the embodiment of the present application only takes the first network device as an example to represent a network device. After understanding the technical solution of the present application, technical personnel in this field will easily think of the situation where the first network device includes multiple network devices, which should all fall within the scope of protection of the present application.

[0105] In summary, the technical solution provided in the embodiment of the present application determines the positional relationship between the terminal device and the network device according to the device information of the network device, and then selects the cell corresponding to the network device as the resident cell when the positional relationship meets certain conditions, thereby providing a method for selecting a resident cell based on the positional relationship between the terminal device and the network device. In addition, in the embodiment of the present application, since the difference in the positional relationship between the terminal device and different network devices is relatively obvious, even if there are measurement and calculation errors when the terminal device determines the positional relationship between it and the network device, it can also more clearly reflect whether the terminal device is closer to the center of the service range of the network device or closer to the edge of the service range of the network device, so that a more accurate reference can be provided for the terminal device to select a resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when selecting or reselecting a target cell, the technical solution provided in the embodiment of the present application can improve the accuracy of the resident cell selection result, thereby avoiding the state of no network service or poor network service caused by the terminal device due to inaccurate resident cell selection, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device during subsequent random access, or improving the switching efficiency of the terminal device during subsequent cell switching.

[0106] In addition, in the embodiment of the present application, there are multiple ways for the terminal device to obtain the device information of the network device, for example, pre-configured in the USIM card, carried in the system message or carried in the RRC message, thereby improving the flexibility of the terminal device to obtain the device information of the network device. Moreover, since the device information of the network device can include the device information of all network devices in the communication system, the terminal device only needs to obtain the device information of the network device once and store it, which can be used multiple times in the subsequent random access process or cell switching process, avoiding the need for the terminal device to obtain the device information of the network device multiple times, and reducing the processing overhead of the terminal device.

[0107] In addition, in the technical solution provided in the embodiment of the present application, when the terminal device selects the resident cell, it can simultaneously consider the positional relationship between the terminal device and the network device, and the channel quality measurement result of the cell corresponding to the network device. In this case, the terminal device determines the resident cell only when the positional relationship meets certain conditions and the channel quality measurement result meets another condition. Due to the consideration of a variety of reference factors, the determination of the positional relationship provided in the embodiment of the present application can make up for the error of the channel quality measurement result, solve the problem of inaccurate resident cell selection in the related art, and further improve the accuracy of the resident cell selection result.

[0108] In a possible implementation, Figure 8As shown, the above step 410 includes the following steps (412-414):

[0109] Step 412: The terminal device determines the location of the first network device according to the device information of the first network device.

[0110] In the embodiment of the present application, the device information of the first network device may directly indicate the location of the first network device, or may indirectly indicate the location of the first network device.

[0111] In one example, when the communication system is a terrestrial cellular network system, the network device is generally implemented as a base station, and the device information of the first network device may include the location information of the first network device, and the location information indicates the location of the first network device. The terminal device may directly determine the location of the first network device based on the device information of the first network device.

[0112] In another example, when the communication system is an NTN system, the network device is usually implemented as a satellite. Since the satellite is mobile, the position of the satellite is different at different times. At this time, the position of the satellite cannot be directly shown in the device information. Based on this, in the embodiment of the present application, the device information of the first network device includes the ephemeris information of the first network device, and the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device, and reference speed information of the first network device, wherein the reference position information may include the initial position of the first network device, the reference time information may include the initial time of the first network device, and the reference speed information may include the initial speed of the first network device. According to the device information of the first network device, the terminal device may substitute the ephemeris information in the device information into the position calculation function to calculate the position of the first network device. Optionally, the reference position information of the first network device is associated with the reference time information of the first network device, that is, the reference position information of the first network device is the position information associated with the reference time of the first network device. Optionally, the position calculation function may be pre-configured by the network to the terminal device, or may be pre-defined in the protocol, and the embodiment of the present application does not limit this.

[0113] Step 414: The terminal device determines the distance between the terminal device and the first network device according to the location of the terminal device and the location of the first network device.

[0114] The positional relationship between the terminal device and the first network device can be expressed as the distance between the terminal device and the first network device. After the terminal device determines the position of the first network device, it can calculate the distance between itself and the first network device based on its own position and the position of the first network device. Optionally, the terminal device has positioning capability and can obtain its own position information. Fig. 9As shown, assuming that the first network device includes three network devices, namely network device 1, network device 2, and network device 3, the terminal device can obtain its own position based on the positioning capability, and determine the current positions of network device 1, network device 2, and network device 3 respectively according to the device information of the first network device, and then calculate the distance between itself and network device 1, network device 2, and network device 3 respectively according to the positioning capability, and record them as d1, d2, and d3 respectively.

[0115] In one example, based on steps 412 to 414, the first condition includes: the distance between the terminal device and the first network device belongs to the first value range. In the NTN system, since there is usually a certain distance between the network device (satellite) and the ground, the terminal device cannot approach the network device without restriction. Therefore, the first condition includes that the distance between the terminal device and the first network device belongs to the first value range, rather than being less than a certain threshold. Optionally, since network devices are usually located in different orbits, the distances between different network devices and the ground are not necessarily the same, and thus the first value range is determined based on the specific network device, that is, there is a corresponding relationship between the first value range and the first network device, such as Fig. 9 As shown, different value ranges can be applied to network device 1, network device 2, and network device 3, respectively. Assuming that network device 1, network device 2, and network device 3 correspond to value range 1, value range 2, and value range 3, respectively, when the terminal device determines whether the position relationship satisfies the first condition, it judges whether d1 is within value range 1, whether d2 is within value range 2, and whether d3 is within value range 3. Optionally, the value ranges may be the same for different network devices, which is not limited in the embodiments of the present application. Optionally, the first value range may be pre-configured by the network device, or may be pre-specified in the protocol. Optionally, the first value range may be included in the first information to avoid the network device from obtaining information multiple times and reduce the processing overhead of the network device.

[0116] In another example, based on the above steps 412 to 414, the above first condition may also include: the distance between the terminal device and the network device is less than a preset threshold. The first condition may indicate that the distance between the terminal device and the network device is close and thus the channel quality is good. If the first condition is met, it can be considered that the terminal device receives the network service of the first network device well.

[0117] In summary, the technical solution provided by the embodiment of the present application provides a specific method for determining the positional relationship between the terminal device and the network device, by determining the position of the network device according to the device information of the network device, and then determining the distance between the terminal device and the network device according to its own position and the position of the network device, when the positional relationship between the terminal device and the network device is expressed as the distance between the terminal device and the network device. In addition, the embodiment of the present application proposes conditions that need to be met when selecting a resident cell for the NTN system and the terrestrial cellular network system, respectively, and realizes the specific determination of the conditions that need to be met when selecting a resident cell according to the characteristics of different communication systems, so that the technical solution provided by the embodiment of the present application can be applied in different communication systems.

[0118] In another possible implementation, Fig.10 As shown, the above step 410 includes the following steps (41A-41C):

[0119] Step 41A: The terminal device determines the location of the first network device according to the device information of the first network device.

[0120] Based on the above Figure 8 The description of step 412 in the embodiment can be used to obtain the description of step 41A in this embodiment. For a detailed description of step 41A, please refer to the description of step 412 above, which will not be repeated here.

[0121] In one example, based on the above step 41A, the device information of the above first network device includes the ephemeris information of the first network device, wherein the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device, and reference speed information of the first network device. For an introduction to the ephemeris information, please refer to the above Figure 8 The embodiments are not described in detail here.

[0122] Step 41C: The terminal device determines the inclination angle between the line connecting the terminal device and the first network device and the ground horizontal line according to the position of the terminal device and the position of the first network device.

[0123] The positional relationship between the terminal device and the first network device can be expressed as the inclination angle between the line connecting the terminal device and the first network device and the ground horizontal line. After the terminal device determines the position of the first network device, it can calculate the inclination angle between the line connecting the terminal device and the first network device and the ground horizontal line based on its own position and the position of the first network device. Optionally, the terminal device has positioning capability and can obtain its own position information. Fig.11As shown, the terminal device is located within the service range of the first network device. It can obtain its own position based on the positioning capability, determine the position of the first network device based on the device information of the first network device, and then determine the inclination angle of the line connecting it and the first network device and the horizontal line of the ground based on its own position and the position of the first network device, which is recorded as the inclination angle alpha.

[0124] In one example, based on the above steps 41A to 41C, the above first condition includes: the difference between the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than the first threshold value, wherein the first inclination angle refers to the inclination angle of the line connecting the first network device and the first reference position and the ground horizontal line. Optionally, the first threshold value can be pre-configured by the network device, or pre-specified by the protocol, or determined by the terminal device in combination with actual conditions, which is not limited in the embodiment of the present application. Optionally, the first threshold value can be included in the device information of the first network device. In the NTN system, since there is usually a certain distance between the network device (satellite) and the ground, the line connecting the network device and a certain point on the ground usually deviates from the horizontal line to form an inclination angle. In the embodiment of the present application, a certain point on the ground is represented by the first reference position. Optionally, to facilitate the determination of the first reference position, the first reference position can include the ground coverage center point of the first network device.

[0125] In one example, based on the above steps 41A to 41C and the above first condition, the device information of the above first network device includes angle beam information of the first network device, wherein the angle beam information includes a first tilt angle. In the NTN system, network devices have two mobility modes, one is that the service range changes and the tilt angle remains unchanged; the other is that the service range remains unchanged and the tilt angle changes. Fig.10 The embodiment provides a method for a terminal device to determine the position relationship between the terminal device and the network device for the first type. Fig.12 The embodiment provides a method for a terminal device to determine the position relationship between itself and a network device for the second type, and the first type is discussed here first. Fig.11 As shown, assuming that the first reference position is the ground coverage center point of the first network device, denoted as point A, after the first network device moves, its service range changes, and the ground coverage center point moves from point A to point B, but the inclination angle between the line connecting the first network device and the ground coverage center point and the ground horizontal line does not change, that is, the inclination angle between the line connecting the first network device and point A and the ground horizontal line is equal to the inclination angle between the line connecting the first network device and point B and the ground horizontal line. For this type of network device, angle beam information can be added to the device information of the first network device, and the angle beam information is used to indicate that the beam (service range) of the cell corresponding to the first network device moves with the movement of the first network device, but the inclination angle between the beam and the first reference position remains unchanged, that is, the first inclination angle remains unchanged.

[0126] Because in the NTN system, the beam directions of the cells corresponding to different network devices may also be different, that is, assuming that the service ranges of the two network devices are the same, the locations of the two network devices are different. At this time, if the inclination angle between the connection line from the terminal device to the network device and the ground horizontal line is directly used to meet the first condition, it is necessary to set the first condition for each network device, which may bring huge processing overhead to the network device or the operator, and bring greater storage pressure to the terminal device. Based on this, the embodiment of the present application proposes a way to set the first condition, that is, to set the first condition as the difference between the inclination angle of the connection line between the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than a first threshold. After the terminal device determines the inclination angle of the connection line between it and the first network device and the ground horizontal line, if the inclination angle is less than the first threshold, it can be determined that the first condition is met, and the cell corresponding to the first network device is selected as the resident cell.

[0127] In summary, the technical solution provided by the embodiment of the present application provides a method for specifically determining the positional relationship between the terminal device and the network device, when the positional relationship between the terminal device and the network device is expressed as the inclination of the line connecting the terminal device and the network device and the ground horizontal line, by the terminal device according to the device information of the network device, and then determining the inclination of the line connecting the terminal device and the network device and the ground horizontal line according to its own position and the position of the network device. In addition, the embodiment of the present application provides a method for specifically setting the conditions that need to be met when selecting a resident cell for the situation that when the network device moves in the NTN system, the service range changes, but the inclination of the line connecting the terminal device and the ground reference position and the ground horizontal line remains unchanged, that is, the difference between the inclination of the line connecting the terminal device and the network device and the ground horizontal line and the inclination of the line connecting the network device and the ground reference position and the ground horizontal line is less than a preset threshold value. Compared with directly comparing the inclination of the line connecting the network device and the ground horizontal line with a certain threshold value or a certain value range, it is necessary to specifically determine the conditions that need to be met when selecting a resident cell for each network device. The technical solution provided by the embodiment of the present application reduces the processing overhead of the network device or the operator, and also reduces the storage pressure of the terminal device.

[0128] In another possible implementation, Fig.12 As shown, the above step 410 includes the following steps (41B-41D):

[0129] Step 41B: The terminal device determines the second reference location according to the device information of the first network device.

[0130] The second reference position refers to a certain position on the ground. Optionally, the second reference position may include the ground coverage center point of the first network device. Optionally, in order to facilitate the determination of the second reference position, the second reference position may be included in the device information of the first network device, so that the terminal device can directly determine the second reference position after determining the first network device; the second reference position may also be calculated by the terminal device based on the device information of the first network device. For example, assuming that the terminal device determines that the second reference position is the ground coverage center point, the terminal device can obtain the coverage range of the first network device based on the device information of the first network device, and can calculate the second reference position based on the coverage range.

[0131] In step 41D, the terminal device determines the distance between the terminal device and the second reference position.

[0132] The positional relationship between the terminal device and the first network device can be expressed as the distance between the terminal device and the second reference position. After the terminal device determines the second reference position, it can calculate the distance between the terminal device and the second reference position based on its own position and the second reference position. Optionally, the terminal device has positioning capability and can obtain its own position information. Fig.13 As shown, the terminal device is located within the service range of the first network device. It can obtain its own position based on the positioning capability, determine the second reference position based on the device information of the first network device, recorded as point C, and then determine the distance between it and the second reference position based on its own position and the second reference position, recorded as d.

[0133] In one example, based on steps 41B to 41D, the first condition includes: the distance between the terminal device and the second reference location is less than a second threshold. Optionally, the second threshold may be pre-configured by the network device, may be pre-specified by the protocol, or may be determined by the terminal device in combination with actual conditions, which is not limited in the embodiments of the present application. Optionally, the second threshold may be included in the device information of the first network device.

[0134] In one example, based on the above steps 41B to 41D, the device information of the above first network device includes coverage location information of the first network device, and the coverage location information includes the second reference location. Fig.10 In the embodiment, two types of network devices in the NTN system are introduced. Fig.12 The embodiment is directed to a method for a terminal device to determine the positional relationship between the terminal device and the network device provided by the second type of network device. Fig.11As shown, assuming that the second reference position is the ground coverage center point of the first network device, denoted as point C, after the first network device moves, its service range does not change, and the ground coverage center point does not change either. For this type of network device, coverage location information can be added to the device information of the first network device, and the coverage location information is used to indicate that the beam direction (service range) of the cell corresponding to the first network device changes with the movement of the first network device, but the service range of the first network device remains unchanged.

[0135] In summary, the technical solution provided by the embodiment of the present application provides a specific method for determining the positional relationship between the terminal device and the network device, in the case where the positional relationship between the terminal device and the network device is expressed as the distance between the terminal device and the ground reference position, by the terminal device determining the ground reference position according to the device information of the network device, and then determining the distance between the terminal device and the ground reference position according to its own position and the ground reference position. In addition, the embodiment of the present application provides a method for specifically setting the conditions that need to be met in the resident cell for the situation where the beam direction changes but the service range remains unchanged when the network device moves in the NTN system, thereby providing a specific judgment method for the terminal device to judge whether it is in a central position close to the network device or in an edge position close to the network device, so as to facilitate the terminal device to judge the positional relationship between it and the network device.

[0136] It should be noted that in the above method embodiment, the technical solution of the present application is mainly introduced and explained from the perspective of the interaction between the network device and the terminal device. The above steps performed by the terminal device can be independently implemented as a cell selection method on the terminal device side; the above steps performed by the network device can be independently implemented as a cell selection method on the network device side.

[0137] Another point that needs to be explained is that in the above method embodiments, only typical situations in the NTN system and the terrestrial cellular network system are used as examples for illustration, but this does not constitute a limitation on the embodiments of the present application. After understanding the technical solutions provided in the embodiments of the present application, those skilled in the art will easily think of other implementation methods, such as applying the implementation plan proposed for the NTN system to the terrestrial cellular network system, which should all fall within the scope of protection of the present application.

[0138] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0139] Please refer to Fig.14, which shows a block diagram of a cell selection device provided by an embodiment of the present application. The device has the function of implementing the method example on the terminal device side mentioned above, and the function can be implemented by hardware, or by hardware executing corresponding software. The device can be the terminal device mentioned above, or it can be set in the terminal device. Fig.14 As shown, the apparatus 1400 may include: a relationship determination module 1410 and a cell selection module 1420 .

[0140] The relationship determination module 1410 is used to determine the position relationship between the terminal device and the first network device according to the first information, and the first information includes the device information of the first network device.

[0141] The cell selection module 1420 is configured to select a cell corresponding to the first network device as a resident cell when the location relationship satisfies a first condition.

[0142] Alternatively, if Fig.15 As shown, the relationship determination module 1410 includes: a first position determination submodule 1412, used to determine the position of the first network device according to the device information of the first network device; a first distance determination submodule 1414, used to determine the distance between the terminal device and the first network device according to the position of the terminal device and the position of the first network device.

[0143] Optionally, the first condition includes: a distance between the terminal device and the first network device belongs to a first value range.

[0144] Alternatively, if Fig.15 As shown, the relationship determination module 1410 includes: a second position determination submodule 141A, used to determine the position of the first network device according to the device information of the first network device; an inclination determination submodule 141C, used to determine the inclination of the line connecting the terminal device and the first network device and the ground horizontal line according to the position of the terminal device and the position of the first network device.

[0145] Optionally, the first condition includes: the difference between the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than a first threshold; wherein the first inclination angle refers to the inclination angle of the line connecting the first network device and the first reference position and the ground horizontal line.

[0146] Optionally, the first reference position includes a ground coverage center point of the first network device.

[0147] Optionally, the device information of the first network device includes angle beam information of the first network device, and the angle beam information includes the first tilt angle.

[0148] Optionally, the device information of the first network device includes ephemeris information of the first network device, and the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device and reference speed information of the first network device.

[0149] Alternatively, if Fig.15 As shown, the relationship determination module 1410 includes: a third position determination submodule 141B, used to determine the second reference position of the first network device according to the device information of the first network device; and a second distance determination submodule 141D, used to determine the distance between the terminal device and the second reference position.

[0150] Optionally, the second reference position includes a ground coverage center point of the first network device.

[0151] Optionally, the first condition includes: a distance between the terminal device and the second reference position is less than a second threshold.

[0152] Optionally, the device information of the first network device includes coverage location information of the first network device, and the coverage location information includes a second reference location of the first network device.

[0153] Alternatively, if Fig.15 As shown, the device 1400 also includes: an information acquisition module 1430, used to obtain cell information of a first cell, and the first cell is used for the terminal device to select the resident cell; a device determination module 1440, used to determine the first network device from the at least one network device based on the cell information of the cell corresponding to at least one network device and the cell information of the first cell.

[0154] Optionally, the cell information includes: a physical cell identifier PCI and / or frequency information.

[0155] Optionally, it is characterized in that the first information is pre-configured in the universal user identity card USIM of the terminal device; or, the first information is carried in a system message and sent to the terminal device; or, the first information is carried in a radio resource control RRC signaling and sent to the terminal device.

[0156] Alternatively, if Fig.15As shown, the device 1400 also includes: a result acquisition module 1450, used to obtain the channel quality measurement result of the cell corresponding to the first network device; the cell selection module 1420 is also used to select the cell corresponding to the first network device as the resident cell when the position relationship meets the first condition and the channel quality measurement result meets the second condition.

[0157] Optionally, the second condition includes: the channel quality measurement result satisfies the S criterion.

[0158] In summary, the technical solution provided in the embodiment of the present application determines the positional relationship between the terminal device and the network device according to the device information of the network device, and then selects the cell corresponding to the network device as the resident cell when the positional relationship meets certain conditions, thereby providing a method for selecting a resident cell based on the positional relationship between the terminal device and the network device. In addition, in the embodiment of the present application, since the difference in the positional relationship between the terminal device and different network devices is relatively obvious, even if there are measurement and calculation errors when the terminal device determines the positional relationship between it and the network device, it can also more clearly reflect whether the terminal device is closer to the center of the service range of the network device or closer to the edge of the service range of the network device, so that a more accurate reference can be provided for the terminal device to select a resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when selecting or reselecting a target cell, the technical solution provided in the embodiment of the present application can improve the accuracy of the resident cell selection result, thereby avoiding the state of no network service or poor network service caused by the terminal device due to inaccurate resident cell selection, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device during subsequent random access, or improving the switching efficiency of the terminal device during subsequent cell switching.

[0159] Please refer to Fig.16 , which shows a block diagram of a cell selection device provided by an embodiment of the present application. The device has the function of implementing the method example on the network device side mentioned above, and the function can be implemented by hardware, or by hardware executing corresponding software. The device can be the network device mentioned above, or it can be set in the network device. Fig.16 As shown, the device 1600 may include: an information sending module 1610.

[0160] The information sending module 1610 is used to send first information to the terminal device, wherein the first information includes device information of the first network device, and the first information is used for the terminal device to determine the position relationship between it and the first network device, and the position relationship is used for the terminal device to select a resident cell.

[0161] Optionally, the first information is carried in a system message, or the first information is carried in a radio resource control RRC signaling.

[0162] In summary, the technical solution provided in the embodiment of the present application determines the positional relationship between the terminal device and the network device according to the device information of the network device, and then selects the cell corresponding to the network device as the resident cell when the positional relationship meets certain conditions, thereby providing a method for selecting a resident cell based on the positional relationship between the terminal device and the network device. In addition, in the embodiment of the present application, since the difference in the positional relationship between the terminal device and different network devices is relatively obvious, even if there are measurement and calculation errors when the terminal device determines the positional relationship between it and the network device, it can also more clearly reflect whether the terminal device is closer to the center of the service range of the network device or closer to the edge of the service range of the network device, so that a more accurate reference can be provided for the terminal device to select a resident cell, so as to improve the accuracy of the resident cell selection result. In addition, since the resident cell is the cell selected by the terminal device when selecting or reselecting a target cell, the technical solution provided in the embodiment of the present application can improve the accuracy of the resident cell selection result, thereby avoiding the state of no network service or poor network service caused by the terminal device due to inaccurate resident cell selection, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device during subsequent random access, or improving the switching efficiency of the terminal device during subsequent cell switching.

[0163] One point that needs to be explained is that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0164] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0165] Please refer to Fig.17 , which shows a schematic diagram of the structure of a terminal device 170 provided in an embodiment of the present application. For example, the terminal device may be the terminal device described above, and is used to execute the cell selection method on the terminal device side. Specifically, the terminal device 170 may include a processor 171, a receiver 172, a transmitter 173, a memory 174, and a bus 175.

[0166] The processor 171 includes one or more processing cores. The processor 171 executes various functional applications and information processing by running software programs and modules.

[0167] The receiver 172 and the transmitter 173 may be implemented as a transceiver 176 , which may be a communication chip.

[0168] The memory 174 is connected to the processor 171 via a bus 175 .

[0169] The memory 174 may be used to store a computer program, and the processor 171 may be used to execute the computer program to implement each step performed by the terminal in the above method embodiment.

[0170] In addition, the memory 174 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc) or other optical storage, tape cassettes, magnetic tapes, disk storage or other magnetic storage devices. Among them:

[0171] The processor 171 is used to determine the position relationship between the terminal device and the first network device according to the first information, where the first information includes the device information of the first network device.

[0172] The processor 171 is configured to select a cell corresponding to the first network device as a resident cell when the position relationship satisfies a first condition.

[0173] Optionally, the processor 171 is used to: determine the location of the first network device according to the device information of the first network device; determine the distance between the terminal device and the first network device according to the location of the terminal device and the location of the first network device.

[0174] Optionally, the first condition includes: a distance between the terminal device and the first network device belongs to a first value range.

[0175] Optionally, the processor 171 is used to: determine the position of the first network device according to the device information of the first network device; determine the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line according to the position of the terminal device and the position of the first network device.

[0176] Optionally, the first condition includes: the difference between the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than a first threshold; wherein the first inclination angle refers to the inclination angle of the line connecting the first network device and the first reference position and the ground horizontal line.

[0177] Optionally, the first reference position includes a ground coverage center point of the first network device.

[0178] Optionally, the device information of the first network device includes angle beam information of the first network device, and the angle beam information includes the first tilt angle.

[0179] Optionally, the device information of the first network device includes ephemeris information of the first network device, and the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device and reference speed information of the first network device.

[0180] Optionally, the processor 171 is used to: determine a second reference position of the first network device according to the device information of the first network device; and determine a distance between the terminal device and the second reference position.

[0181] Optionally, the second reference position includes a ground coverage center point of the first network device.

[0182] Optionally, the first condition includes: a distance between the terminal device and the second reference position is less than a second threshold.

[0183] Optionally, the device information of the first network device includes coverage location information of the first network device, and the coverage location information includes a second reference location of the first network device.

[0184] Optionally, the transceiver 176 is used to obtain cell information of a first cell, and the first cell is used for the terminal device to select the resident cell; the processor 171 is also used to determine the first network device from the at least one network device based on the cell information of the cell corresponding to at least one network device and the cell information of the first cell.

[0185] Optionally, the cell information includes: a physical cell identifier PCI and / or frequency information.

[0186] Optionally, it is characterized in that the first information is pre-configured in the universal user identity card USIM of the terminal device; or, the first information is carried in a system message and sent to the terminal device; or, the first information is carried in a radio resource control RRC signaling and sent to the terminal device.

[0187] Optionally, the transceiver 176 is also used to obtain the channel quality measurement result of the cell corresponding to the first network device; the processor 171 is also used to select the cell corresponding to the first network device as the resident cell when the position relationship satisfies the first condition and the channel quality measurement result satisfies the second condition.

[0188] Optionally, the second condition includes: the channel quality measurement result satisfies the S criterion.

[0189] Please refer to Fig.18 , which shows a schematic diagram of the structure of a network device 180 provided in an embodiment of the present application. For example, the network device may be the network device described above, and is used to execute the cell selection method on the network device side. Specifically, the network device 180 may include a processor 181, a receiver 182, a transmitter 183, a memory 184, and a bus 185.

[0190] The processor 181 includes one or more processing cores. The processor 181 executes various functional applications and information processing by running software programs and modules.

[0191] The receiver 182 and the transmitter 183 may be implemented as a transceiver 186 , which may be a communication chip.

[0192] The memory 184 is connected to the processor 181 via a bus 185 .

[0193] The memory 184 may be used to store a computer program, and the processor 181 may be used to execute the computer program to implement each step performed by the network device in the above method embodiment.

[0194] In addition, the memory 184 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc) or other optical storage, tape cassettes, magnetic tapes, disk storage or other magnetic storage devices. Among them:

[0195] The transceiver 186 is used to send first information to the terminal device, wherein the first information includes device information of the first network device, and the first information is used for the terminal device to determine the position relationship between itself and the first network device, and the position relationship is used for the terminal device to select a resident cell.

[0196] Optionally, the first information is carried in a system message, or the first information is carried in a radio resource control RRC signaling.

[0197] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a terminal device to implement the cell selection method on the terminal device side.

[0198] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be executed by a processor of a network device to implement the cell selection method on the network device side.

[0199] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a terminal device, it is used to implement the cell selection method on the terminal device side as described above.

[0200] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a network device, it is used to implement the cell selection method on the network device side as described above.

[0201] The present application also provides a computer program product. When the computer program product is run on a computer on a terminal device side, the computer is enabled to execute the cell selection method on the terminal device side.

[0202] The present application also provides a computer program product. When the computer program product is run on a computer on a network device side, the computer is enabled to execute the cell selection method on the network device side.

[0203] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0204] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cell selection method, characterized in that: Applied in a terminal device, the method comprises: Determine a positional relationship between the terminal device and the first network device according to first information, where the first information includes device information of the first network device; When the position relationship satisfies a first condition, selecting a cell corresponding to the first network device as a resident cell; Wherein, determining the position relationship between the terminal device and the first network device according to the first information includes: Determine the position of the first network device according to the device information of the first network device; and determine the inclination angle between the line connecting the terminal device and the first network device and the ground horizontal line according to the position of the terminal device and the position of the first network device; The first condition includes: a difference between an inclination angle between a line connecting the terminal device and the first network device and a ground horizontal line and a first inclination angle is less than a first threshold; wherein the first inclination angle refers to an inclination angle between a line connecting the first network device and the first reference position and a ground horizontal line; The method further comprises: Acquire cell information of a first cell, where the first cell is used for the terminal device to select the resident cell; The first network device is determined from the at least one network device according to the cell information of the cell corresponding to the at least one network device and the cell information of the first cell.

2. The method according to claim 1, characterized in that The determining the position relationship between the terminal device and the first network device according to the first information further includes: Determine the location of the first network device according to the device information of the first network device; The distance between the terminal device and the first network device is determined according to the location of the terminal device and the location of the first network device.

3. The method according to claim 2, characterized in that The first condition includes: the distance between the terminal device and the first network device belongs to a first value range.

4. The method according to claim 1, characterized in that The first reference location includes a ground coverage center point of the first network device.

5. The method according to claim 1, characterized in that The device information of the first network device includes angle beam information of the first network device, and the angle beam information includes the first tilt angle.

6. The method according to claim 2, characterized in that The device information of the first network device includes ephemeris information of the first network device, and the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device, and reference speed information of the first network device.

7. The method according to claim 1, characterized in that The cell information includes: physical cell identifier PCI and / or frequency information.

8. The method according to any one of claims 1 to 7, characterized in that: The first information is pre-configured in a universal subscriber identity card (USIM) of the terminal device; Alternatively, the first information is carried in a system message and sent to the terminal device; Alternatively, the first information is carried in radio resource control RRC signaling and sent to the terminal device.

9. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: Obtaining a channel quality measurement result of a cell corresponding to the first network device; When the position relationship satisfies the first condition and the channel quality measurement result satisfies the second condition, the cell corresponding to the first network device is selected as the resident cell.

10. The method according to claim 9, characterized in that The second condition includes: the channel quality measurement result meets the S criterion.

11. A cell selection method, characterized in that: Applied in a network device, the method comprises: Sending first information to a terminal device, wherein the first information includes device information of a first network device, and the first information is used for the terminal device to determine a positional relationship between the terminal device and the first network device, and the positional relationship is used for the terminal device to select a camped cell, wherein the first information is specifically used for the terminal device to determine the position of the first network device according to the device information of the first network device, and to determine an inclination angle between a line connecting the terminal device and the first network device and a ground horizontal line according to the position of the terminal device and the position of the first network device; The network device is also used to configure a first condition so that when the position relationship of the terminal device satisfies the first condition, the cell corresponding to the first network device is selected as the resident cell, wherein the first condition includes: the difference between the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than a first threshold; wherein the first inclination angle refers to the inclination angle of the line connecting the first network device and the first reference position and the ground horizontal line.

12. The method according to claim 11, characterized in that The first information is carried in a system message, or the first information is carried in a radio resource control RRC signaling.

13. A cell selection device, characterized in that: Applied in a terminal device, the device comprises: a relationship determination module, configured to determine a position relationship between the terminal device and the first network device according to first information, wherein the first information includes device information of the first network device; A cell selection module, configured to select a cell corresponding to the first network device as a resident cell when the position relationship satisfies a first condition; Wherein, the relationship determination module includes: A second location determination submodule, configured to determine a location of the first network device according to the device information of the first network device; an inclination determination submodule, used to determine the inclination of a line connecting the terminal device and the first network device and a ground horizontal line according to the position of the terminal device and the position of the first network device; The first condition includes: a difference between an inclination angle between a line connecting the terminal device and the first network device and a ground horizontal line and a first inclination angle is less than a first threshold; wherein the first inclination angle refers to an inclination angle between a line connecting the first network device and the first reference position and a ground horizontal line; Wherein, the device further comprises: An information acquisition module, used to acquire cell information of a first cell, where the first cell is used for the terminal device to select the resident cell; The device determination module is used to determine the first network device from the at least one network device according to the cell information of the cell corresponding to the at least one network device and the cell information of the first cell.

14. The device according to claim 13, characterized in that The relationship determination module also includes: A first location determination submodule, configured to determine a location of the first network device according to the device information of the first network device; The first distance determination submodule is used to determine the distance between the terminal device and the first network device according to the location of the terminal device and the location of the first network device.

15. The device according to claim 14, characterized in that The first condition includes: the distance between the terminal device and the first network device belongs to a first value range.

16. The device according to claim 13, characterized in that The first reference location includes a ground coverage center point of the first network device.

17. The device according to claim 13, characterized in that The device information of the first network device includes angle beam information of the first network device, and the angle beam information includes the first tilt angle.

18. The device according to claim 14, characterized in that The device information of the first network device includes ephemeris information of the first network device, and the ephemeris information includes: orbit information of the first network device, reference position information of the first network device, reference time information of the first network device, and reference speed information of the first network device.

19. The device according to claim 13, characterized in that The cell information includes: physical cell identifier PCI and / or frequency information.

20. The device according to any one of claims 13 to 19, characterized in that The first information is pre-configured in a universal subscriber identity card (USIM) of the terminal device; Alternatively, the first information is carried in a system message and sent to the terminal device; Alternatively, the first information is carried in radio resource control RRC signaling and sent to the terminal device.

21. The device according to any one of claims 13 to 19, characterized in that The device also includes: A result acquisition module, used to obtain a channel quality measurement result of the cell corresponding to the first network device; The cell selection module is further configured to select a cell corresponding to the first network device as the resident cell when the position relationship satisfies the first condition and the channel quality measurement result satisfies a second condition.

22. The device according to claim 21, characterized in that The second condition includes: the channel quality measurement result meets the S criterion.

23. A cell selection device, characterized in that: Applied in a network device, the device comprises: an information sending module, configured to send first information to a terminal device, wherein the first information includes device information of a first network device, and the first information is used for the terminal device to determine a positional relationship between the terminal device and the first network device, and the positional relationship is used for the terminal device to select a resident cell, wherein the first information is specifically used for the terminal device to determine a position of the first network device according to the device information of the first network device, and to determine an inclination angle between a line connecting the terminal device and the first network device and a ground horizontal line according to the position of the terminal device and the position of the first network device; The network device is also used to configure a first condition so that when the position relationship of the terminal device satisfies the first condition, the cell corresponding to the first network device is selected as the resident cell, wherein the first condition includes: the difference between the inclination angle of the line connecting the terminal device and the first network device and the ground horizontal line and the first inclination angle is less than a first threshold; wherein the first inclination angle refers to the inclination angle of the line connecting the first network device and the first reference position and the ground horizontal line.

24. The device according to claim 23, characterized in that The first information is carried in a system message, or the first information is carried in a radio resource control RRC signaling.

25. A terminal device, characterized in that: The terminal device includes a processor, a transceiver connected to the processor, and a memory; wherein the memory is used to store a computer program, and the processor is used to execute the computer program to cooperate with the transceiver to implement the cell selection method as described in any one of claims 1 to 10.

26. A network device, characterized in that: The network device includes a processor, a transceiver connected to the processor, and a memory; wherein the memory is used to store a computer program, and the processor is used to execute the computer program to cooperate with the transceiver to implement the cell selection method as described in any one of claims 11 to 12.

27. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to be executed by a processor of a terminal device to implement the cell selection method according to any one of claims 1 to 10.

28. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to be executed by a processor of a network device to implement the cell selection method as claimed in claim 11 or 12.

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