CN115004722A

CN115004722A - Cell selection method, device, equipment and storage medium

Info

Publication number: CN115004722A
Application number: CN202080093901.3A
Authority: CN
Inventors: 李海涛; 尤心
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2022-09-02
Also published as: WO2021159463A1

Abstract

A cell selection method, a device, equipment and a storage medium relate to the technical field of communication. The method comprises the following steps: the terminal equipment determines the position relation between the terminal equipment and the first network equipment according to the first information; and under the condition that the position relation of the terminal equipment meets the first condition, selecting the cell corresponding to the first network equipment as the resident cell. The method for selecting the resident cell based on the position relationship between the terminal equipment and the network equipment is provided, and because the difference of the position relationship between the terminal equipment and different network equipment is obvious, more accurate reference can be provided for the terminal equipment to select the resident cell so as to improve the accuracy of a resident cell selection result. In addition, the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, so that the access efficiency of the terminal device in subsequent random access and the switching efficiency of the terminal device in subsequent cell switching are improved.

Description

Cell selection method, device, equipment and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a cell selection method, an apparatus, a device, and a storage medium.

Background

3GPP (3rd Generation Partnership Project) introduced NTN (Non Terrestrial communication Network) technology in a 5G NR (New Radio) system.

The NTN generally provides communication services to terrestrial users by way of satellite communications. NTN systems have many unique advantages over terrestrial cellular communication systems. First, the NTN system is not limited by the user territory, and since one satellite can cover a large ground and orbit around the earth, theoretically every corner on the earth can be covered by the NTN system. Secondly, the NTN system has a great social value, and the NTN system can cover in remote mountain areas, poor and laggard countries or areas with low cost, so that people in the areas enjoy advanced voice communication and mobile internet technology, the digital gap of developed areas is favorably reduced, and the development of the areas is promoted. Third, the NTN system is far away, and the cost of communication is not increased significantly when the communication distance is increased. And finally, the stability of the NTN system is high and is not limited by natural disasters.

In the NTN technology, since spatial path loss between a UE (User Equipment) and a satellite does not significantly vary with distance, further research is required for how to select a suitable camping cell for the UE.

Disclosure of Invention

The embodiment of the application provides a cell selection method, a device, equipment and a storage medium. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a cell selection method, which is applied to a terminal device, and the method includes:

determining a position relation between the terminal equipment and first network equipment according to first information, wherein the first information comprises equipment information of the first network equipment;

and under the condition that the position relation meets a first condition, selecting the cell corresponding to the first network equipment as a resident cell.

In another aspect, an embodiment of the present application provides a cell selection method, which is applied to a network device, and the method includes:

and sending first information to a terminal device, wherein the first information comprises device information of a first network device, 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.

In another aspect, an embodiment of the present application provides a cell selection apparatus, which is applied to a terminal device, where the apparatus includes:

a relationship determining module, configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device;

and the cell selection module is used for selecting the cell corresponding to the first network equipment as the resident cell under the condition that the position relation meets a first condition.

In another aspect, an embodiment of the present application provides a cell selection apparatus, which is applied in a network device, and the apparatus includes:

the information sending module is configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a residential cell.

In a further aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a processor and a transceiver connected to the processor; wherein:

the processor is configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device;

the processor is further configured to select a cell corresponding to the first network device as a camped cell when the location relationship satisfies a first condition.

In yet another aspect, an embodiment of the present application provides a network device, where the network device includes a processor and a transceiver connected to the processor; wherein:

the transceiver is configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a resident cell.

In a further aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a terminal device to implement the cell selection method on the terminal device side.

In a further aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a network device to implement the above-mentioned cell selection method on the network device side.

In a further aspect, an embodiment of the present application provides a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a terminal device, the chip is configured to implement the cell selection method on the terminal device side as described above.

In a further aspect, an embodiment of the present application provides a chip, where the chip includes a programmable logic circuit and/or program instructions, and when the chip runs on a network device, the chip is configured to implement the cell selection method on the network device side as described above.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

the method comprises the steps that the terminal equipment determines the position relation between the terminal equipment and the network equipment according to the equipment information of the network equipment, and then the cell corresponding to the network equipment is selected as the resident cell under the condition that the position relation meets a certain condition, so that the resident cell is selected based on the position relation between the terminal equipment and the network equipment. In addition, in the embodiment of the present application, since the difference between the position relationship between the terminal device and the different network devices is relatively obvious, even if there is a measurement and calculation error when the terminal device determines the position relationship between the terminal device and the network device, it can be clearly reflected whether the terminal device is closer to the center position of the service range of the network device or closer to the edge position of the service range of the network device, so that a relatively accurate reference can be provided for the terminal device to select the residential cell, so as to improve the accuracy of the selection result of the residential cell. In addition, because the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, the technical scheme provided by the embodiment of the application can improve the accuracy of the selection result of the resident cell, and also avoid the condition that the terminal device has no network service or the network service is poor due to the inaccurate selection of the resident cell, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when the terminal device subsequently performs random access or the switching efficiency of the terminal device when the cell is subsequently switched.

In addition, in the embodiment of the present application, there are multiple ways for the terminal device to acquire the device information of the network device, for example, the terminal device is preconfigured in the USIM card, carried in the system message, or carried in the RRC message, so that the flexibility of the terminal device to acquire the device information of the network device is improved. In addition, the device information of the network device may include the device information of all network devices in the communication system, so that the terminal device only needs to acquire the device information of the network device once and store the device information, and the terminal device can be used for multiple times in the subsequent random access process or cell switching process, thereby avoiding the terminal device from acquiring the device information of the network device multiple times and reducing the processing overhead of the terminal device.

In addition, in the technical solution provided in this embodiment, when the terminal device selects the resident cell, the location relationship between the terminal device and the network device and the channel quality measurement result of the cell corresponding to the network device may be considered at the same time. In this case, the terminal device determines the camping cell only when the position relationship satisfies a certain condition and the channel quality measurement result satisfies another condition. Due to the fact that multiple reference factors are considered in a combined mode, the determination of the position relation provided by the embodiment of the application can make up for errors of the channel quality measurement result, the problem that the selection of the resident cell in the related technology is inaccurate is solved, and the accuracy of the selection result of the resident cell is further improved.

Drawings

FIG. 1 is a schematic diagram of a network architecture provided by one embodiment of the present application;

FIG. 2 is a schematic diagram of a network architecture provided by another embodiment of the present application;

FIG. 3 is a schematic diagram of a network architecture provided by another embodiment of the present application;

fig. 4 is a flowchart of a cell selection method according to an embodiment of the present application;

fig. 5 is a flowchart of a cell selection method according to another embodiment of the present application;

fig. 6 is a flowchart of a cell selection method according to still another embodiment of the present application;

fig. 7 is a flowchart of a cell selection method according to another embodiment of the present application;

fig. 8 is a flowchart of a method for determining a position relationship according to an embodiment of the present application;

fig. 9 is a schematic diagram of a position relationship determination method according to an embodiment of the present application;

fig. 10 is a flowchart of a position relationship determination method according to another embodiment of the present application;

fig. 11 is a schematic diagram of a position relationship determination method according to another embodiment of the present application;

fig. 12 is a flowchart of a position relationship determination method according to another embodiment of the present application;

fig. 13 is a schematic diagram of a position relationship determination method according to still another embodiment of the present application;

fig. 14 is a block diagram of a cell selection apparatus according to an embodiment of the present application;

fig. 15 is a block diagram of a cell selection apparatus according to another embodiment of the present application;

fig. 16 is a block diagram of a cell selection apparatus according to another embodiment of the present application;

fig. 17 is a block diagram of a terminal device according to an embodiment of the present application;

fig. 18 is a block diagram of a network device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

Referring to fig. 1, a schematic diagram of a network architecture according to an embodiment of the present application is shown. The network architecture may include: network device 10 and terminal device 20.

The network device 10 is a device for providing a wireless communication service to the terminal device 20. The network device 10 and the terminal device 20 may establish a connection over the air interface, so that communication, including interaction of signaling and data, is performed through the connection. There may be a plurality of network devices 10, and two adjacent network devices 10 may communicate with each other in a wired or wireless manner. The terminal device 20 may switch between different network devices 10, i.e. establish a connection with different network devices 10.

In one example, as shown in fig. 2, taking an NTN network as an example, the network device 10 in the NTN network may be a satellite 11. One satellite 11 may cover a range of terrestrial regions to provide wireless communication services to terminal devices 20 in the terrestrial region. In addition, the satellite 11 can orbit around the earth, and by arranging a plurality of satellites 11, communication coverage of different areas on the surface of the earth can be realized.

Satellite communications have many unique advantages over terrestrial cellular communication networks. First, satellite communication is not limited by user regions, for example, general terrestrial communication cannot cover regions where communication equipment cannot be set up, such as the sea, mountains, desert, and the like, or communication coverage is not performed due to sparse population, and for satellite communication, since one satellite can cover a large ground and the satellite can orbit around the earth, theoretically every corner on the earth can be covered by satellite communication. Second, satellite communication has great social value. Satellite communication can be covered in remote mountainous areas, poor and laggard countries or areas with lower cost, so that people in the areas can enjoy advanced voice communication and mobile internet technology, the digital gap between the areas is favorably reduced and developed, and the development of the areas is promoted. Thirdly, the satellite communication distance is long, and the cost of communication is not obviously increased when the communication distance is increased; and finally, the satellite communication has high stability and is not limited by natural disasters.

Communication satellites are classified into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Orbit) satellites, HEO (High elliptic Orbit) satellites, and the like according to the difference in orbital altitude. The main research in the current stage is LEO and GEO.

1、LEO

The height range of the low-orbit satellite is 500 km-1500 km, and the corresponding orbit period is about 1.5 hours-2 hours. The signal propagation delay for inter-user single-hop communications is typically less than 20 ms. Maximum satellite visibility time 20 minutes. The signal propagation distance is short, the link loss is less, and the requirement on the transmitting power of the user terminal is not high.

2、GEO

A geosynchronous orbit satellite, with an orbital altitude of 35786km, has a period of 24 hours of rotation around the earth. The signal propagation delay for inter-user single-hop communications is typically 250 ms.

In order to ensure the coverage of the satellite and improve the system capacity of the whole satellite communication system, the satellite adopts multiple beams to cover the ground, and one satellite can form dozens of or even hundreds of beams to cover the ground; one satellite beam may cover a ground area several tens to hundreds of kilometers in diameter.

In another example, as shown in fig. 3, taking a cellular communication network as an example, the network device 10 in the cellular communication network may be a base station 12. Base station 12 is a device deployed in an access network to provide wireless communication functions for terminal equipment 20. The base stations 12 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different Radio access technologies, names of devices having network device functions may be different, for example, in a 5G NR (New Radio, New air interface) system, called a nodeb or a gNB. The name "base station" may change as communication technology evolves. For convenience of description, in the embodiment of the present application, the above-mentioned apparatuses providing the terminal device 20 with the wireless communication function are collectively referred to as a network device.

In addition, the terminal device 20 related to the embodiment of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), terminal devices (terminal device), and so on. For convenience of description, in the embodiments of the present application, the above-mentioned devices are collectively referred to as terminal devices.

In addition, in the embodiments of the present application, the terms "network" and "system" are generally used mixedly, but those skilled in the art can understand the meaning thereof.

The technical scheme provided by the embodiment of the application can be suitable for an NTN system and can also be suitable for a cellular network system.

In a cellular network system, one of the basic conditions that a terminal device can normally camp on a cell is that the cell can provide a service level that satisfies S-criteria, that is, only when the measurement evaluation result of a cell satisfies S-criteria, it is possible to become a target cell for cell selection and reselection. The S-criteria specify:

srxlev >0 and Squal >0

Wherein, the expressions of Srxlev and Squal are respectively as follows:

Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)–Pcompensation–Qoffsettemp

Squal＝Qqualmeas–(Qqualmin+Qqualminoffset)-Qoffsettemp

the meaning of each parameter appearing in the above expression is explained as follows:

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

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

Qrxlevmin is the minimum received power RSRP required by the network device.

Qqualmin is the minimum signal quality, RSRQ, required by the network device.

Qrxlevminiffset and Qqualminoffset are offsets that prevent ping-pong effects between two PLMNs (Public Land Mobile networks) due to radio environment fluctuations, that is, qrxlevminiffset and Qqualminoffset are offsets to Qrxlevmin and Qqualmin, respectively, that need to be considered when a terminal device resides on a VPLMN (Visited Public Land Mobile Network) to periodically search for a higher priority PLMN.

Pcompensation is power compensation, for example, when the maximum transmission power allowed by the network device is greater than the maximum uplink transmission power determined by the capability of the terminal device, the power compensation is caused by the low power of the terminal device.

Qoffsettemp is only used for special scenarios, and is not applicable in normal cases, such as "thousand leaf problem" scenarios.

Since RSRP represents reference signal received power, Qrxlevmeas- (Qrxlevmin + qrxlevmjnoffset) indicates downlink received signal quality, and Pcompensation indicates uplink transmitted signal quality, Srxlev is an evaluation value that is evaluated in consideration of uplink and downlink signal power strengths and that can represent service quality that can be provided by a cell, with respect to RSRP. RSRQ, as a signal quality metric value that comprehensively takes into account RSRP as well as total received power (including interference and noise effects), may provide a more reliable basis for evaluation than RSRP, so Squal also represents a cell service level. The quality of service provided by the cell can be more comprehensively evaluated by Srxlev and Squal. The S-criterion becomes a basic evaluation condition for whether a cell can camp on.

Because the spatial path loss of the ground cellular network varies greatly, even if a certain measurement error exists in the process of measuring the RSRP and the RSRQ of the terminal device, as long as the measurement values of the RSRP and the RSRQ are greater than a certain threshold value, the signal quality from the terminal device to the network device can still be represented for normal connection establishment and data transmission. However, in the NTN system, since the distance between the network device such as a satellite and the terminal device is too far, the change of the spatial path loss variation with the position is not significant for different positions within the service coverage of the network device, and at this time, if only the error of the RSRP/RSRQ measurement value is considered, the position of the terminal device within the service coverage of the network device cannot be accurately described any more. For example, assuming that, for different positions within the service coverage of the network device, the RSRP that the terminal device can measure is in the range from-4 dB to 4dB, at this time, if the measurement error of the RSRP is 4dB and the value of the RSRP actually measured by the terminal device is 0, the terminal device cannot determine whether the terminal device is located near the center of the network device or near the edge of the network device, and 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 determination when selecting a camping cell due to the RSRP measurement error, so as to cause problems such as subsequent cell access failure, and reduce the cell access efficiency.

Based on this, the embodiment of the application provides a cell selection method, device, equipment and storage medium. In the technical solution provided in the embodiment of the present application, a terminal device determines a location relationship between the terminal device and a network device according to device information of the network device, and then selects a cell corresponding to the network device as a residential cell when the location relationship satisfies a certain condition, thereby providing a specific selection method for the residential cell. In addition, in the embodiment of the application, because the difference between the position relationship between the terminal device and different network devices is obvious, even if measurement and calculation errors exist when the terminal device determines the position relationship between the terminal device and the network devices, whether the terminal device is closer to the center position of the service range of the network devices or closer to the edge position of the service range of the network devices can be clearly reflected, so that more accurate reference can be provided for the terminal device to select the resident cell, and the accuracy of the selection result of the resident cell can be improved. In addition, because the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, the technical scheme provided by the embodiment of the application can improve the accuracy of the selection result of the resident cell, and also avoid the condition that the terminal device has no network service or the network service is poor due to the inaccurate selection of the resident cell, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when the terminal device subsequently performs random access or the switching efficiency of the terminal device when the cell is subsequently switched.

In addition, in the embodiment of the present application, there are multiple ways for the terminal device to acquire the device information of the network device, for example, the terminal device is preconfigured in a USIM card, carried in a system message, or carried in an RRC message, so that flexibility of the terminal device to acquire the device information of the network device is improved. In addition, the device information of the network device may include the device information of all network devices in the communication system, so that the terminal device only needs to acquire the device information of the network device once and store the device information, and the terminal device can be used for multiple times in the subsequent random access process or cell switching process, thereby avoiding the terminal device from acquiring the device information of the network device multiple times and reducing the processing overhead of the terminal device.

In addition, in the technical solution provided in the embodiment of the present application, when the terminal device selects the resident cell, the location relationship between the terminal device and the network device and the channel quality measurement result of the cell corresponding to the network device may be considered at the same time. In this case, the terminal device determines the camping cell only when the location relationship satisfies a certain condition and the channel quality measurement result satisfies another condition. Due to the fact that multiple reference factors are considered in a combined mode, the determination of the position relation provided by the embodiment of the application can make up for errors of the channel quality measurement result, the problem that the selection of the resident cell in the related technology is inaccurate is solved, and the accuracy of the selection result of the resident cell is further improved.

The technical solution of the present application will be described below with reference to several exemplary embodiments.

Referring to fig. 4, a flowchart of a cell selection method provided in an embodiment of the present application is shown, where the method can be applied to the network architectures shown in fig. 1 to 3, and the method can include the following steps (410-420):

and step 410, the terminal device determines the position relationship between the terminal device and the first network device according to the first information.

After the terminal device acquires the first information, the position relationship between the terminal device and the first network device may be determined through measurement, calculation, and the like according to the first information, and a specific representation form of the position relationship is not limited in this embodiment of the application.

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

In this embodiment of the application, the first information includes device information of a first network device, where the first network device is a network device that can currently provide a network service for a terminal device, and please refer to the following alternative embodiment shown in fig. 6 for a determination process related to the first network device, which is not described herein again. Optionally, the first information may include device information of other network devices besides the first network device, for example, the first information may include device information of all network devices in the communication system. Because the position and the activity range of the terminal device have uncertainty, and the network device corresponding to the network service which can be received by the terminal device also has uncertainty, the embodiment of the application can obtain the device information of the network device corresponding to the network service which can be currently received by the terminal device when the terminal device is at any position by including the information of all the network devices in the first information, so as to realize the timely determination of the network service level of the network device.

Optionally, the terminal device may obtain the first information in various ways, in this embodiment of the application, the first information may be preconfigured in a USIM (Universal Subscriber Identity Module) of the terminal device, for example, when an operator produces a USIM card, the operator may configure the first information in the USIM in advance, so that the terminal device may directly obtain the first information when using the USIM card; or, the first information may be carried in a system message and sent to the terminal device, for example, the network device may pre-configure the first information, and then carry the first information in the system message when broadcasting the system message to the terminal device within its service range, so that the terminal device obtains the first information; or the first information may be carried in a Radio Resource Control (RRC) signaling and sent to the terminal device, for example, the network device may pre-configure the first information, and then when sending the RRC signaling to the terminal device that successfully accesses the network device, carry the first information in the RRC signaling, so that the terminal device obtains the first information. According to the embodiment of the application, the flexibility of the terminal equipment for acquiring the first information is improved by providing various modes for acquiring the first information. Moreover, since the first information may include device information of all network devices in the communication system, after acquiring the first information, the terminal device may store the first information so as to be used for multiple times when a target cell is selected or reselected in a subsequent cell, which avoids that the terminal device needs to acquire the first information again each time when the target cell is selected or reselected in a cell, thereby reducing processing overhead of the terminal device.

Optionally, as shown in fig. 5, before the step 410, a step 402 is further included: the network device sends the first information to the terminal device. Since the first information may 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, the network device may carry the first information in the system message under a condition that the terminal device does not access the network device; when the terminal device accesses the network device, the network device may carry the first information in the system message, or may carry the first information in the RRC signaling.

In one example, as shown in FIG. 6, before the step 410, the method further comprises the following steps (404-406):

in step 404, the terminal device obtains cell information of the first cell.

The first cell refers to a cell that can currently provide network service for the terminal device, and in this embodiment of the present application, the first cell is used for the terminal device to select a camped cell. The terminal device may obtain cell information of the first cell at the current position by measuring and the like, where the cell information of a certain cell is information for uniquely identifying the cell, and optionally, the cell information includes: PCI (Physical Cell Identity) and/or frequency point information, that is, in the embodiment of the present application, the Cell information may only include PCI; or only frequency point information can be included; the method can also comprise the PCI and the frequency point information, and only the PCI or only the frequency point information can be used as the cell information when the reasons such as processing overhead and the like are considered in practical application; when the reasons such as the accuracy of identifying a certain cell are taken into consideration, the PCI and the frequency point information may be used as cell information at the same time, which is not limited in the embodiment of the present application.

Step 406, the terminal device determines 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.

Optionally, cell information of a cell corresponding to at least one network device may be carried in the first information, and when the terminal device acquires the first information, the terminal device acquires the cell information of the cell corresponding to the at least one network device; or as a piece of information alone, in this case, the information may be preconfigured in the USIM card of the terminal equipment, may be carried in the system message, and may be carried in the RRC signaling. In addition, the terminal device may acquire the information in the same manner as the first information, or may acquire the information in a different manner from the first information, which is not limited in this embodiment of the application. Optionally, in order to avoid that the terminal device acquires information for multiple times and reduce processing overhead of the terminal device, the at least one network device may be all network devices in a communication system in which the terminal device is located, and at this time, the cell information of the cell corresponding to the at least one network device refers to cell information corresponding to all network devices.

In this embodiment of the present application, a 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 the at least one network device, that is, the corresponding relationship between the 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, according to the cell information of the first cell obtained and the cell information of the cell corresponding to the at least one network device, so as to complete the step of determining the first network device from the at least one network device. Optionally, the cell information of the cell corresponding to at least one network device may be given in the form of a table, and from the table, the cell information may be mapped to the network device corresponding to a certain cell according to the cell identifier of the certain cell.

Step 420, the terminal device selects a cell corresponding to the first network device as a camping cell when the location relationship satisfies the first condition.

After the terminal device determines the location relationship between the terminal device and the first network device, a residential cell may be selected according to the location relationship, where the residential cell is a candidate cell to which the terminal device may access. Optionally, the terminal device selects a cell corresponding to the first network device as a camped cell when the location relationship satisfies the first condition. In this embodiment of the application, the first condition may be preconfigured by the network device, or may be predefined in the protocol, or may be specifically determined by the terminal device according to a determination condition of the location relationship, for example, assuming that the location relationship is a distance, when the terminal device determines distances between the terminal device and the plurality of network devices, the plurality of distances may be obtained, and then, the terminal device may determine the first condition according to specific values of the plurality of distances, for example, determine that the first condition is that the value is the maximum, or determine that the value of the first condition is within a certain value interval, or determine that the value of the first condition is smaller than a certain threshold, so that according to the first condition, the terminal device may select a distance satisfying the first condition from the plurality of distances, and determine that a cell corresponding to the distance satisfying the first condition is a residential cell. In practical application, there may be a plurality of network devices that can currently provide network services for the terminal device, and the terminal device determines the first condition, so that the value of the first condition can be determined flexibly according to the actual scene.

In one example, as shown in FIG. 7, the method further comprises the following steps (430-440):

step 430, the terminal device obtains a channel quality measurement result of the cell corresponding to the first network device.

In the embodiment of the present application, the terminal device may measure and calculate the network service level of the cell for which the network service is currently provided. Optionally, the network service level may 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), and the like, and the specific content of the channel quality measurement result is not limited in the embodiment of the present application.

It should be noted that, in the embodiment of the present application, the execution order of step 410 and step 430 is not limited, in practical applications, step 410 may be executed first, step 430 may also be executed first, and step 410 and step 430 may also be executed simultaneously, where fig. 7 only exemplifies that step 410 is executed first.

Step 440, the terminal device selects the cell corresponding to the first network device as the resident cell when the location relation satisfies the first condition and the channel quality measurement result satisfies the second condition.

In order to make the selection of the resident cell more accurate, and improve the access efficiency when the terminal device subsequently performs random access, or improve the handover efficiency when the terminal device performs cell handover, the terminal device may further select the cell corresponding to the first network device as the resident cell on the basis that the position relationship between the terminal device and the first network device satisfies the first condition, and the channel quality measurement result of the cell corresponding to the first network device satisfies the second condition.

The second condition may be preconfigured by the network device, may also be predefined in the protocol, and may also be specifically determined by the terminal device according to the actually obtained channel quality measurement result. Optionally, the second condition comprises: the channel quality measurements satisfy the S criteria. For a detailed description of the S criteria, reference is made to the above embodiments, which are not repeated herein.

It should be noted that, for convenience of description, the first network device may include a plurality of network devices, and the embodiment of the present application is illustrated by taking the first network device as an example, and after understanding the technical solutions of the present application, a person skilled in the art will easily think that the first network device includes a plurality of network devices, which all fall within the protection scope of the present application.

To sum up, according to the technical solution provided in the embodiment of the present application, the terminal device determines the location 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 location relationship satisfies a certain condition, thereby providing a method for selecting the resident cell based on the location relationship between the terminal device and the network device. In addition, in the embodiment of the application, because the difference between the position relationship between the terminal device and different network devices is obvious, even if measurement and calculation errors exist when the terminal device determines the position relationship between the terminal device and the network devices, whether the terminal device is closer to the center position of the service range of the network devices or closer to the edge position of the service range of the network devices can be clearly reflected, so that more accurate reference can be provided for the terminal device to select the resident cell, and the accuracy of the selection result of the resident cell can be improved. In addition, because the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, the technical scheme provided by the embodiment of the application can improve the accuracy of the selection result of the resident cell, and also avoid the condition that the terminal device has no network service or the network service is poor due to the inaccurate selection of the resident cell, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when the terminal device subsequently performs random access or the switching efficiency of the terminal device when the cell is subsequently switched.

In addition, in the embodiment of the present application, there are multiple ways for the terminal device to acquire the device information of the network device, for example, the terminal device is preconfigured in the USIM card, carried in the system message, or carried in the RRC message, so that the flexibility of the terminal device to acquire the device information of the network device is improved. And, because 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 acquire the device information of the network device once and store the device information, and can be used for multiple times in the subsequent random access process or cell switching process, thereby avoiding the terminal device from acquiring the device information of the network device for multiple times and reducing the processing overhead of the terminal device.

In one possible embodiment, as shown in FIG. 8, the step 410 includes the following steps (412-414):

in step 412, the terminal device determines the location of the first network device according to the device information of the first network device.

In this embodiment of the application, the device information of the first network device may directly show the location of the first network device, or may indirectly show the location of the first network device.

In one example, when the communication system is a terrestrial cellular network system, the network device is typically implemented as a base station, and the device information of the first network device may include location information of the first network device, the location information indicating a location of the first network device. The terminal device can directly determine the position of the first network device according to the device information of the first network device.

In another example, when the communication system is an NTN system, the network device is usually implemented as a satellite, and due to mobility of the satellite, positions of the satellite are different at different times, and the positions of the satellite cannot be directly shown in the device information, based on which in this embodiment, the device information of the first network device includes ephemeris information of the first network device, where the ephemeris information includes: the track information of the first network device, the reference location information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device, wherein the reference location information may include an initial location of the first network device, the reference time information may include an initial time of the first network device, and the reference speed information may include an initial speed of the first network device. The terminal device may substitute the ephemeris information in the device information into the position calculation function according to the device information of the first network device, so as to calculate the position of the first network device. Optionally, the reference location information of the first network device is associated with the reference time information of the first network device, i.e. the reference location information of the first network device is the location information associated with the reference time of the first network device. Optionally, the position calculation function may be configured in advance by the network to the terminal device, or may be predefined in the protocol, which is not limited in this embodiment of the present application.

In step 414, the terminal device determines a 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.

The positional relationship between the terminal device and the first network device may be expressed as a distance between the terminal device and the first network device. After the terminal device determines the location of the first network device, the distance between the terminal device and the first network device can be calculated according to the location of the terminal device and the location of the first network device. Optionally, the terminal device has a positioning capability, and can acquire its own location information. As shown in fig. 9, it is assumed that the first network device includes three network devices, which are respectively a network device 1, a network device 2, and a network device 3, and the terminal device can acquire its own location according to the location capability, respectively determine the current locations of the network device 1, the network device 2, and the network device 3 according to the device information of the first network device, then calculate the distances between the terminal device and the network device 1, the network device 2, and the network device 3 according to the location capability, and respectively record the distances as d1, d2, and d 3.

In one example, based on the steps 412 to 414, the first condition includes: the distance between the terminal device and the first network device belongs to a first value range. In the NTN system, since a certain distance usually exists between a network device (satellite) and the ground, the terminal device cannot approach the network device without limitation, and therefore, the first condition includes that the distance between the terminal device and the first network device belongs to a first value range, rather than being smaller than a certain threshold. Optionally, because the network devices are usually located on different tracks, and distances between different network devices and the ground are not necessarily the same, the first value range is determined according to a specific network device, that is, there is a corresponding relationship between the first value range and the first network device, as shown in fig. 9, different value ranges may be respectively applied to the network device 1, the network device 2, and the network device 3, and assuming that the network device 1, the network device 2, and the network device 3 correspond to the value range 1, the value range 2, and the value range 3, when determining whether the location relationship satisfies the first condition, the terminal device respectively determines whether d1 is within the value range 1, d2 is within the value range 2, and d3 is within the value range 3. Optionally, the value ranges may also be the same for different network devices, which is not limited in this embodiment of the present application. Optionally, the first value range may be configured in advance by the network device, or may be predefined in the protocol. Optionally, the first value range may be included in the first information, so as to avoid that the network device acquires the information multiple times, and reduce processing overhead of the network device.

In another example, based on the steps 412 to 414, the first condition may further include: the distance between the terminal equipment and the network equipment is smaller than a preset threshold value. The first condition may indicate that the distance between the terminal device and the network device is short and thus the channel quality is good, and if the first condition is satisfied, the terminal device may be considered to receive the network service of the first network device well.

To sum up, according to the technical solution provided in this embodiment, when the location relationship between the terminal device and the network device is represented by the distance between the terminal device and the network device, the terminal device determines the location of the network device according to the device information of the network device, and then determines the distance between the terminal device and the network device according to the location of the terminal device and the location of the network device, thereby providing a specific way for determining the location relationship between the terminal device and the network device. Moreover, the embodiments of the present application respectively propose conditions that need to be met when selecting a camped cell for an NTN system and a terrestrial cellular network system, and specifically determine the conditions that need to be met when selecting a camped cell according to characteristics of different communication systems, so that the technical solutions provided in the embodiments of the present application are applicable to different communication systems.

In another possible embodiment, as shown in fig. 10, the step 410 includes the following steps (41A to 41C):

step 41A, the terminal device determines the location of the first network device according to the device information of the first network device.

An explanation of the step 41A in this embodiment can be obtained based on the explanation of the step 412 in the embodiment of fig. 8. For a detailed description of step 41A, please refer to the description of step 412, which is not repeated herein.

In an example, based on the step 41A, the device information of the first network device includes ephemeris information of the first network device, where the ephemeris information includes: the track information of the first network device, the reference position information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device. For an introduction description of ephemeris information, please refer to the embodiment of fig. 8, which is not described herein again.

And step 41C, the terminal device determines the inclination angle between the connection line between 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 position relationship between the terminal device and the first network device may be represented as an inclination angle between a connection line of the terminal device and the first network device and a horizontal line of the ground. After the terminal device determines the position of the first network device, the terminal device can calculate the inclination angle between the connection line between 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. Optionally, the terminal device has a positioning capability, and can acquire its own location information. As shown in fig. 11, the terminal device is located within the service range of the first network device, and can acquire its own location according to the positioning capability, determine the location of the first network device according to the device information of the first network device, and then determine an inclination angle between a connection line between the terminal device and the first network device and a ground horizontal line according to its own location and the location of the first network device, and record the inclination angle as an inclination angle alpha.

In one example, based on the steps 41A to 41C, the first condition includes: and the difference value between the inclination angle of the connecting line of the terminal equipment and the first network equipment with the ground horizontal line and the first inclination angle is smaller than a first threshold value, wherein the first inclination angle refers to the inclination angle of the connecting line of the first network equipment and the first reference position with the ground horizontal line. Optionally, the first threshold may be preconfigured by the network device, may also be predefined by the protocol, and may also be determined by the terminal device in combination with the actual situation, which is not limited in this embodiment of the application. Optionally, the first threshold may be included in the device information of the first network device. In the NTN system, since the network device (satellite) is usually located a certain distance away from the ground, a line connecting the network device and a certain point on the ground is usually deviated from the horizontal line to form an inclination angle. In this embodiment, a point on the ground is represented by a first reference location, and optionally, to facilitate determining the first reference location, the first reference location may include a ground coverage center point of the first network device.

In one example, based on the steps 41A to 41C and the first condition, the device information of the 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, the network equipment has two moving modes, one is that the service range is changed and the dip angle is not changed; the other is that the service range is unchanged and the tilt angle is changed, the embodiment of fig. 10 provides a way for the terminal device to determine the location relationship between the terminal device and the network device for the first type, and the embodiment of fig. 12 provides a way for the terminal device to determine the location relationship between the terminal device and the network device for the second type, where the first type is discussed first. As shown in fig. 11, assuming that the first reference location is a ground coverage center point of the first network device, which is 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 an inclination angle between a connection line of the first network device and the ground coverage center point and the ground horizontal line does not change, that is, an inclination angle between a connection line of the first network device and the ground coverage center point and the ground horizontal line is equal to an inclination angle between a connection line of the first network device and the ground horizontal line. For this type of network device, angle beam information for indicating that a beam (service range) of a cell corresponding to the first network device moves with the movement of the first network device, but an inclination angle between the beam and the first reference position remains unchanged, that is, the first inclination angle remains unchanged, may be added to the device information of the first network device.

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 positions of the two network devices are different, and at this time, if the inclination angle between the connection line from the terminal device to the network device and the horizontal line of the ground is directly adopted to satisfy the first condition, the first condition needs to be set for each network device, which may bring huge processing overhead to the network device or the operator and bring large storage pressure to the terminal device. Based on this, the embodiment of the present application provides a manner of setting a first condition, that is, setting the first condition that a difference between an inclination angle of a connection line between the terminal device and the first network device and a ground horizontal line and the first inclination angle is smaller than a first threshold. After the terminal device determines the inclination angle between the connection line between the terminal device and the first network device and the horizontal line of the ground, the terminal device can determine that the first condition is met under the condition that the inclination angle is smaller than a first threshold value, and select the cell corresponding to the first network device as the resident cell.

To sum up, in the technical solution provided in this embodiment, when the position relationship between the terminal device and the network device shows an inclination angle between the connection line between the terminal device and the network device and the ground horizontal line, the terminal device determines the position of the network device according to the device information of the network device, and then determines the inclination angle between the connection line between the terminal device and the network device and the ground horizontal line according to the position of the terminal device and the position of the network device, thereby providing a specific way for determining the position relationship between the terminal device and the network device. Moreover, in the embodiments of the present application, for a situation that a service range is changed when a network device in an NTN system moves, but an inclination angle between a connection line with a ground reference position and a ground horizontal line is not changed, a manner is provided for specifically setting a condition that needs to be met when a residential cell is selected, that is, a difference between an inclination angle between a connection line between a terminal device and the network device and the ground horizontal line and an inclination angle between a connection line between the network device and the ground reference position and the ground horizontal line is smaller than a preset threshold.

In yet another possible embodiment, as shown in fig. 12, the step 410 includes the following steps (41B to 41D):

and step 41B, the terminal device determines the second reference position according to the device information of the first network device.

The second reference position refers to a certain position on the ground, and optionally, the second reference position may include a ground coverage center point of the first network device. Optionally, in order to determine the second reference location conveniently, the second reference location may be included in the device information of the first network device, so that the terminal device may directly determine the second reference location after determining the first network device; the second reference position may also be calculated by the terminal device according to the device information of the first network device, for example, if the terminal device determines that the second reference position is a ground coverage central point, after the terminal device obtains the coverage area of the first network device according to the device information of the first network device, the terminal device may calculate the second reference position according to the coverage area.

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

The positional relationship between the terminal device and the first network device may be expressed as a distance between the terminal device and the second reference position. After the terminal device determines the second reference position, the distance between the terminal device and the second reference position can be calculated according to the position of the terminal device and the second reference position. Optionally, the terminal device has a positioning capability, and can acquire its own location information. As shown in fig. 13, the terminal device is located within the service range of the first network device, and can obtain its own location according to the positioning capability, determine a second reference location according to the device information of the first network device, and record it as point C, and then determine a distance between itself and the second reference location according to its own location and the second reference location, and record it as d.

In one example, based on the steps 41B to 41D, the first condition includes: the distance between the terminal device and the second reference position is less than a second threshold. Optionally, the second threshold may be preconfigured by the network device, may also be predefined by the protocol, and may also be determined by the terminal device in combination with the actual situation, which is not limited in this embodiment of the application. Optionally, the second threshold may be included in the device information of the first network device.

In one example, based on the steps 41B to 41D, 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. Two types of network devices in the NTN system are described in the embodiment of fig. 10, and the embodiment of fig. 12 is directed to a manner in which a terminal device provided by a second type of network device determines a location relationship between the terminal device and the network device. As shown in fig. 11, it is assumed that the second reference location is a ground coverage center point of the first network device, which is denoted as point C, and after the first network device moves, the service range of the first network device does not change, and the ground coverage center point does not change. For this type of network device, coverage location information indicating 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 may be added to the device information of the first network device.

To sum up, according to the technical solution provided in the embodiment of the present application, when the position relationship between the terminal device and the network device represents a distance between the terminal device and the ground reference position, the ground reference position is determined by the terminal device according to the device information of the network device, and then the distance between the ground reference position and the ground reference position is determined according to the position of the terminal device and the ground reference position, so that a specific way for determining the position relationship between the terminal device and the network device is provided. Moreover, the embodiment of the present application provides a specific manner for setting the condition that a residential cell needs to satisfy when a network device in an NTN system moves but a service range is not changed, so as to provide a specific manner for a terminal device to determine whether the terminal device is located at a central position close to the network device or at an edge position close to the network device, which is convenient for the terminal device to determine a position relationship between the terminal device and the network device.

It should be noted that, in the above method embodiment, the technical solution of the present application is described mainly from the perspective of interaction between a network device and a terminal device. The steps executed by the terminal device can be independently realized to become a cell selection method of the terminal device side; the steps executed by the network device can be implemented as a cell selection method on the network device side.

It should be noted that, in the above method embodiments, only the typical cases in the NTN system and the terrestrial cellular network system are taken as examples for illustration, but the embodiments of the present application are not limited thereto, and after understanding the technical solutions provided by the embodiments of the present application, a person skilled in the art will easily conceive other implementations, such as applying the proposed implementation for the NTN system to the terrestrial cellular network system, which should all fall within the protection scope of the present application.

The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.

Referring to fig. 14, a block diagram of a cell selection apparatus according to an embodiment of the present application is shown. The device has the function of realizing the method example of the terminal equipment side, and the function can be realized by hardware or by executing corresponding software by hardware. The apparatus may be the terminal device described above, or may be provided in the terminal device. As shown in fig. 14, the apparatus 1400 may include: a relationship determination module 1410 and a cell selection module 1420.

A relationship determining module 1410, configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device.

A cell selecting module 1420, configured to select a cell corresponding to the first network device as a camped cell when the location relationship satisfies a first condition.

Optionally, as shown in fig. 15, the relationship determining module 1410 includes: a first location determining sub-module 1412, configured to determine a location of the first network device according to the device information of the first network device; the first distance determining submodule 1414 is configured to determine, according to the location of the terminal device and the location of the first network device, a distance between the terminal device and the first network device.

Optionally, the first condition comprises: the distance between the terminal device and the first network device belongs to a first value range.

Optionally, as shown in fig. 15, the relationship determining module 1410 includes: the second position determining submodule 141A is configured to determine the position of the first network device according to the device information of the first network device; the inclination angle determining submodule 141C is configured to determine, according to the position of the terminal device and the position of the first network device, an inclination angle between a connection line between the terminal device and the first network device and a ground horizontal line.

Optionally, the first condition comprises: the difference value between the inclination angle of the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground and the first inclination angle is smaller than a first threshold value; the first inclination angle refers to an inclination angle between a connection line of the first network device and a first reference position and a ground horizontal line.

Optionally, the first reference location comprises a ground coverage center point of the first network device.

Optionally, the device information of the first network device includes angle beam information of the first network device, where the angle beam information includes the first tilt angle.

Optionally, the device information of the first network device includes ephemeris information of the first network device, where the ephemeris information includes: the track information of the first network device, the reference position information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device.

Optionally, as shown in fig. 15, the relationship determining module 1410 includes: the third position determining submodule 141B is configured to determine a second reference position of the first network device according to the device information of the first network device; a second distance determining submodule 141D configured to determine a distance between the terminal device and the second reference position.

Optionally, the second reference location comprises a ground coverage center point of the first network device.

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

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.

Optionally, as shown in fig. 15, the apparatus 1400 further includes: an information obtaining module 1430, configured to obtain cell information of a first cell, where the first cell is used for the terminal device to select the residential cell; a device determining module 1440, configured 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.

Optionally, the cell information includes: physical cell identity PCI and/or frequency point information.

Optionally, characterized in that the first information is preconfigured in a universal subscriber 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.

Optionally, as shown in fig. 15, the apparatus 1400 further includes: a result obtaining module 1450, configured to obtain a channel quality measurement result of a cell corresponding to the first network device; the cell selecting module 1420 is further configured to select the cell corresponding to the first network device as the resident cell when the location relationship satisfies the first condition and the channel quality measurement result satisfies a second condition.

Optionally, the second condition comprises: the channel quality measurements satisfy S criteria.

To sum up, according to the technical solution provided in the embodiment of the present application, the terminal device determines the location 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 residential cell when the location relationship satisfies a certain condition, thereby providing a method for selecting the residential cell based on the location relationship between the terminal device and the network device. In addition, in the embodiment of the application, because the difference between the position relationship between the terminal device and different network devices is obvious, even if measurement and calculation errors exist when the terminal device determines the position relationship between the terminal device and the network devices, whether the terminal device is closer to the center position of the service range of the network devices or closer to the edge position of the service range of the network devices can be clearly reflected, so that more accurate reference can be provided for the terminal device to select the resident cell, and the accuracy of the selection result of the resident cell can be improved. In addition, because the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, the technical scheme provided by the embodiment of the application can improve the accuracy of the selection result of the resident cell, and also avoid the condition that the terminal device has no network service or the network service is poor due to the inaccurate selection of the resident cell, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when the terminal device subsequently performs random access or the switching efficiency of the terminal device when the cell is subsequently switched.

Referring to fig. 16, a block diagram of a cell selection apparatus according to an embodiment of the present application is shown. The device has the function of realizing the method example of the network equipment side, and the function can be realized by hardware or by executing corresponding software by hardware. The apparatus may be the network device described above, or may be provided in the network device. As shown in fig. 16, the apparatus 1600 may comprise: an information sending module 1610.

An information sending module 1610, configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a resident cell.

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

To sum up, according to the technical solution provided in the embodiment of the present application, the terminal device determines the location 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 location relationship satisfies a certain condition, thereby providing a method for selecting the resident cell based on the location relationship between the terminal device and the network device. In addition, in the embodiment of the present application, since the difference between the position relationship between the terminal device and the different network devices is relatively obvious, even if there is a measurement and calculation error when the terminal device determines the position relationship between the terminal device and the network device, it can be clearly reflected whether the terminal device is closer to the center position of the service range of the network device or closer to the edge position of the service range of the network device, so that a relatively accurate reference can be provided for the terminal device to select the residential cell, so as to improve the accuracy of the selection result of the residential cell. In addition, because the resident cell is the cell selected by the terminal device when the cell selects or reselects the target cell, the technical scheme provided by the embodiment of the application can improve the accuracy of the selection result of the resident cell, and also avoid the condition that the terminal device has no network service or the network service is poor due to the inaccurate selection of the resident cell, thereby improving the network service quality of the terminal device, and improving the access efficiency of the terminal device when the terminal device subsequently performs random access or the switching efficiency of the terminal device when the cell is subsequently switched.

It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the above functional modules is illustrated, and in practical applications, the above functions may be distributed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Referring to fig. 17, a schematic structural diagram of a terminal device 170 according to an embodiment of the present application is shown, for example, the terminal device may be the terminal device described above, and is configured to execute the cell selection method on the terminal device side. Specifically, the method comprises the following steps: the terminal device 170 may include: a processor 171, a receiver 172, a transmitter 173, a memory 174, and a bus 175.

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

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

The memory 174 is coupled to the processor 171 by a bus 175.

The memory 174 may be used for storing a computer program which the processor 171 is used for executing in order to implement the various steps performed by the terminal in the above-described method embodiments.

Further, memory 174 may be implemented by any type or combination of volatile or non-volatile storage devices, 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, magnetic tape cartridge, magnetic tape, magnetic disk storage or other magnetic storage devices. Wherein:

the processor 171 is configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device.

The processor 171 is configured to select a cell corresponding to the first network device as a camping cell when the location relationship satisfies a first condition.

Optionally, the processor 171 is configured to: determining the position of the first network equipment according to the equipment information of the first network equipment; and determining the distance between the terminal equipment and the first network equipment according to the position of the terminal equipment and the position of the first network equipment.

Optionally, the processor 171 is configured to: determining the position of the first network equipment according to the equipment information of the first network equipment; and determining the inclination angle between the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground according to the position of the terminal equipment and the position of the first network equipment.

Optionally, the device information of the first network device includes ephemeris information of the first network device, where the ephemeris information includes: the track information of the first network device, the reference location information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device.

Optionally, the processor 171 is configured to: determining a second reference position of the first network equipment according to the equipment information of the first network equipment; determining a distance between the terminal device and the second reference location.

Optionally, the transceiver 176 is configured to obtain cell information of a first cell, where the first cell is used for the terminal device to select the camping cell; the processor 171 is further configured to determine the first network device from the at least one network device according to cell information of a cell corresponding to the at least one network device and the cell information of the first cell.

Optionally, the cell information includes: physical cell identity, PCI, and/or frequency point information.

Optionally, the transceiver 176 is further configured to obtain a channel quality measurement result of a cell corresponding to the first network device; the processor 171 is further configured to select the cell corresponding to the first network device as the camping cell when the position relationship satisfies the first condition and the channel quality measurement result satisfies a second condition.

Referring to fig. 18, a schematic structural diagram of a network device 180 according to an embodiment of the present application is shown, for example, the network device may be the network device described above, and is configured to execute the cell selection method on the network device side. Specifically, the method comprises the following steps: the network device 180 may include: a processor 181, a receiver 182, a transmitter 183, a memory 184, and a bus 185.

The processor 181 includes one or more processing cores, and the processor 181 executes various functional applications and information processing by executing software programs and modules.

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

The memory 184 is coupled to the processor 181 by a bus 185.

The memory 184 may be used to store a computer program, and the processor 181 is used to execute the computer program to implement the steps performed by the network device in the above method embodiments.

Further, the memory 184 may be implemented by any type or combination of volatile or non-volatile storage devices, 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, magnetic tape cartridge, magnetic tape, magnetic disk storage or other magnetic storage devices. Wherein:

the transceiver 186 is configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a resident cell.

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

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a terminal device, so as to implement the cell selection method on the terminal device side.

An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used for being executed by a processor of a network device to implement the cell selection method on the network device side.

The embodiment of the present application further provides a chip, where the chip includes a programmable logic circuit and/or a program instruction, and when the chip runs on a terminal device, the chip is configured to implement the cell selection method on the terminal device side as described above.

The embodiment of the present application further provides a chip, where the chip includes a programmable logic circuit and/or a program instruction, and when the chip runs on a network device, the chip is configured to implement the cell selection method on the network device side as described above.

The application also provides a computer program product, which enables a computer to execute the cell selection method of the terminal equipment side when the computer program product runs on the computer of the terminal equipment side.

The present application further provides a computer program product, which when running on a computer on a network device side, causes the computer to execute the above cell selection method on the network device side.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

A cell selection method is applied to a terminal device, and the method comprises the following steps:

determining a position relation between the terminal equipment and first network equipment according to first information, wherein the first information comprises equipment information of the first network equipment;

and under the condition that the position relation meets a first condition, selecting the cell corresponding to the first network equipment as a resident cell.
The method of claim 1, wherein the determining the location relationship between the terminal device and the first network device according to the first information comprises:

determining the position of the first network equipment according to the equipment information of the first network equipment;

and determining the distance between the terminal equipment and the first network equipment according to the position of the terminal equipment and the position of the first network equipment.
The method of claim 2, wherein the first condition comprises: the distance between the terminal device and the first network device belongs to a first value range.
The method of claim 1, wherein the determining the location relationship between the terminal device and the first network device according to the first information comprises:

determining the position of the first network equipment according to the equipment information of the first network equipment;

and determining the inclination angle between the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground according to the position of the terminal equipment and the position of the first network equipment.
The method of claim 4, wherein the first condition comprises: the difference value between the inclination angle of the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground and the first inclination angle is smaller than a first threshold value;

the first inclination angle refers to an inclination angle between a connection line of the first network device and a first reference position and a ground horizontal line.
The method of claim 5, wherein the first reference location comprises a ground coverage center point of the first network device.
The method of claim 5, wherein the device information of the first network device comprises angular beam information of the first network device, and wherein the angular beam information comprises the first tilt angle.
The method of claim 2 or 4, wherein the device information of the first network device comprises ephemeris information of the first network device, the ephemeris information comprising: the track information of the first network device, the reference position information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device.
The method of claim 1, wherein the determining the location relationship between the terminal device and the first network device according to the first information comprises:

determining a second reference position of the first network equipment according to the equipment information of the first network equipment;

determining a distance between the terminal device and the second reference location.
The method of claim 9, wherein the second reference location comprises a ground coverage center point of the first network device.
The method of claim 9, wherein the first condition comprises: the distance between the terminal device and the second reference position is less than a second threshold.
The method of claim 9, wherein the device information of the first network device comprises overlay location information of the first network device, and wherein the overlay location information comprises a second reference location of the first network device.
The method according to any one of claims 1 to 12, further comprising:

acquiring cell information of a first cell, wherein the first cell is used for the terminal equipment to select the resident cell;

and determining the first network equipment from the at least one network equipment according to the cell information of the cell corresponding to the at least one network equipment and the cell information of the first cell.
The method of claim 13, wherein the cell information comprises: physical cell identity PCI and/or frequency point information.
The method of any one of claims 1 to 14,

the first information is pre-configured in a universal subscriber identity card (USIM) of the terminal equipment;

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.
The method of any one of claims 1 to 15, further comprising:

obtaining a channel quality measurement result of a cell corresponding to the first network equipment;

and selecting the cell corresponding to the first network device as the resident cell under the condition that the position relation meets the first condition and the channel quality measurement result meets the second condition.
The method of claim 16, wherein the second condition comprises: the channel quality measurements satisfy S criteria.
A cell selection method applied to a network device, the method comprising:

and sending first information to a terminal device, wherein the first information comprises device information of a first network device, 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.
The method of claim 18, wherein the first information is carried in a system message or wherein the first information is carried in Radio Resource Control (RRC) signaling.
A cell selection apparatus, applied to a terminal device, the apparatus comprising:

a relationship determining module, configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device;

and a cell selection module, configured to select a cell corresponding to the first network device as a camped cell when the location relationship satisfies a first condition.
The apparatus of claim 20, wherein the relationship determination module comprises:

the first position determining submodule is used for determining the position of the first network equipment according to the equipment information of the first network equipment;

and the first distance determining submodule is used for determining the distance between the terminal equipment and the first network equipment according to the position of the terminal equipment and the position of the first network equipment.
The apparatus of claim 21, wherein the first condition comprises: the distance between the terminal device and the first network device belongs to a first value range.
The apparatus of claim 20, wherein the relationship determination module comprises:

the second position determining submodule is used for determining the position of the first network equipment according to the equipment information of the first network equipment;

and the inclination angle determining submodule is used for determining the inclination angle between the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground according to the position of the terminal equipment and the position of the first network equipment.
The apparatus of claim 23, wherein the first condition comprises: the difference value between the inclination angle of the connecting line of the terminal equipment and the first network equipment and the horizontal line of the ground and the first inclination angle is smaller than a first threshold value;

the first inclination angle refers to an inclination angle between a connection line of the first network device and a first reference position and a ground horizontal line.
The apparatus of claim 24, wherein the first reference location comprises a ground coverage center point of the first network device.
The apparatus of claim 24, wherein the device information of the first network device comprises angular beam information of the first network device, and wherein the angular beam information comprises the first tilt angle.
The apparatus of claim 21 or 23, wherein the device information of the first network device comprises ephemeris information of the first network device, and wherein the ephemeris information comprises: the track information of the first network device, the reference location information of the first network device, the reference time information of the first network device, and the reference speed information of the first network device.
The apparatus of claim 20, wherein the relationship determining module comprises:

a third position determining sub-module, configured to determine a second reference position of the first network device according to the device information of the first network device;

and the second distance determining submodule is used for determining the distance between the terminal equipment and the second reference position.
The apparatus of claim 28, wherein the second reference location comprises a ground coverage center point of the first network device.
The apparatus of claim 28, wherein the first condition comprises: the distance between the terminal device and the second reference position is less than a second threshold.
The apparatus of claim 28, wherein the device information of the first network device comprises overlay location information of the first network device, and wherein the overlay location information comprises a second reference location of the first network device.
The apparatus of any one of claims 20 to 31, further comprising:

an information obtaining module, configured to obtain cell information of a first cell, where the first cell is used for the terminal device to select the residential cell;

a device determining module, configured to determine the first network device from the at least one network device according to cell information of a cell corresponding to the at least one network device and cell information of the first cell.
The apparatus of claim 32, wherein the cell information comprises: physical cell identity PCI and/or frequency point information.
The apparatus of any one of claims 20 to 33,

the first information is pre-configured in a universal subscriber identity card (USIM) of the terminal equipment;

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.
The apparatus of any one of claims 20 to 34, further comprising:

a result obtaining module, configured to obtain a channel quality measurement result of a cell corresponding to the first network device;

the cell selection module is further configured to select the cell corresponding to the first network device as the resident cell when the location relationship satisfies the first condition and the channel quality measurement result satisfies a second condition.
The apparatus of claim 35, wherein the second condition comprises: the channel quality measurements satisfy S criteria.
A cell selection apparatus, applied in a network device, the apparatus comprising:

the information sending module is configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a residential cell.
The apparatus of claim 37, wherein the first information is carried in a system message or wherein the first information is carried in Radio Resource Control (RRC) signaling.
A terminal device, wherein said terminal device comprises a processor and a transceiver coupled to said processor; wherein:

the processor is configured to determine a location relationship between the terminal device and a first network device according to first information, where the first information includes device information of the first network device;

the processor is further configured to select a cell corresponding to the first network device as a camped cell when the location relationship satisfies a first condition.
A network device comprising a processor and a transceiver coupled to the processor; wherein:

the transceiver is configured to send first information to a terminal device, where the first information includes device information of a first network device, and the first information is used for the terminal device to determine a location relationship between the terminal device and the first network device, and the location relationship is used for the terminal device to select a resident cell.
A computer-readable storage medium, in which a computer program is stored, the computer program being adapted to be executed by a processor of a terminal device to implement the cell selection method according to any one of claims 1 to 17.
A computer-readable storage medium, in which a computer program is stored which is adapted to be executed by a processor of a network device to implement the cell selection method according to claim 18 or 19.