RU2802590C1 - Cell reselection method and device and storage medium - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: method and device for cell reselection, as well as a data carrier. The cell reselection method includes obtaining a cell distance reference threshold and determining an actual distance between the terminal and a cell center, and performing cell reselection based on the distance reference threshold and the actual distance. The distance threshold is the distance to the cell reference location.

EFFECT: possibility of performing cell reselection in combination with the distance conditions between the terminal and the cell in an NTN network with a large cell radius.

20 cl, 9 dwg

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is a national phase translation of International Application PCT/CN2020/093515, filed May 29, 2020, the contents of which are incorporated herein by reference.

Field of technology to which the invention relates

[0002] The invention relates to the field of communication technology and, in particular, to a method and device for cell reselection, as well as to a storage medium.

Prerequisites for creating the invention

[0003] In the prior art, the terminal reselects a cell for a terrestrial network based on the S criterion and the R criterion.

[0004] With the development of fifth generation networks (5G, 5th Generation), “non-terrestrial” networks (NTN, Non-Terrestrial Network) were introduced. For an NTN network, the cell radius is larger, and the difference in the power of the received reference signals (RSRP, Reference Signal Received Power) or the quality values of the received reference signals (RSRQ, Reference Signal Received Quality) when the terminal is in the center or at the edge of the cell is small; Because the cell radius is larger, the cell overlap area is relatively large.

The essence of the invention

[0005] To solve the problems of the prior art, the invention provides a method and apparatus for cell reselection, as well as a storage medium.

[0006] According to a first aspect of embodiments of the present invention, a cell reselection method is provided, including: obtaining a reference threshold value of a cell distance and determining an actual distance between a terminal and a cell center; and performing cell reselection based on the reference distance threshold and the actual distance.

[0007] In an exemplary implementation, the cell is a serving cell of the terminal, and, in response to the cell selection receive level value being greater than the reference signal received power threshold for intra-frequency measurements, the cell selection quality value is greater than the quality threshold value. of the received reference signal for intra-frequency measurements, and the reference threshold value of the distance of the serving cell is greater than the actual distance between the terminal and the center of the serving cell, do not perform measurement for intra-frequency neighboring cells.

[0008] In another possible implementation, the target cell obtained by performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell.

[0009] In yet another possible implementation, performing cell reselection based on a reference distance threshold value and an actual distance includes: determining R values of a plurality of cells based on a cell reselection criterion R, wherein the plurality of cells includes neighboring cells and a serving cell; in response to the presence of neighboring cells with R values higher than the R value of the serving cell and satisfying the cell reselection criterion S, selecting a neighboring cell with a reference distance threshold value greater than or equal to the actual distance from neighboring cells with R values higher than the value R of the serving cell; in response to the presence of neighboring cells with reference distance thresholds greater than or equal to the actual distances among neighboring cells with R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among neighboring cells with reference distance thresholds greater than or equal to the actual distances. equal to the actual distances, as a reselected cell; and, in response to the absence of a neighboring cell with a reference distance threshold value greater than or equal to the actual distance, among neighboring cells with R values greater than the R value of the serving cell, performing cell reselection based on the reference distance threshold value of the serving cell and the actual distance between the terminal and the center of the serving cell.

[0010] In yet another possible implementation, performing cell reselection based on the reference distance threshold of the serving cell and the actual distance between the terminal and the center of the serving cell includes: in response to the fact that the reference threshold distance of the serving cell is greater than or equal to the actual distance between the terminal and the center of the serving cell. the center of the serving cell, being in the serving cell; and, in response to the reference threshold value of the distance of the serving cell being less than the actual distance between the terminal and the center of the serving cell, selecting a neighboring cell with the largest R value among neighboring cells with R values higher than the R value of the serving cell as the reselected cell.

[0011] In yet another possible implementation, performing cell reselection based on a reference distance threshold and an actual distance includes: selecting cells that satisfy the following conditions: cell selection reception level values greater than 0, cell selection quality values greater than 0, and reference thresholds distance values exceed actual distances; determining R values of a plurality of cells from the selected cells based on the R criterion for reselecting cells; and, in response to the presence of neighboring cells with the determined R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among the neighboring cells with the determined R values greater than the R value of the serving cell as the reselected cell.

[0012] In yet another exemplary implementation, determining the actual distance between a terminal and a cell center includes: determining terminal location information and obtaining reference cell location information provided by a network device; and determining an actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information.

[0013] In yet another possible implementation, determining the actual distance between the terminal and the cell center includes: determining location information of the terminal and transmitting the location information to a network device; and obtaining an actual distance between the terminal and the cell center determined by the network device based on the reference location information of the terminal and the cell location information.

[0014] In yet another possible implementation, obtaining a reference cell distance threshold includes obtaining a reference cell distance threshold based on a system broadcast message of a serving cell and/or a neighboring cell.

[0015] According to a second aspect of embodiments of the invention, a cell reselection method is provided which includes: transmitting a reference distance threshold value of a cell, wherein the reference distance threshold value is configured to cause a terminal to perform cell reselection based on the reference distance threshold value and an actual distance between the terminal and the center of the cell.

[0016] In an embodiment, the method also includes: transmitting reference cell location information, wherein the reference cell location information is configured to determine an actual distance by the terminal.

[0017] In another possible implementation, the method also includes: obtaining information about the location of the terminal; determining an actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information; and transmitting the actual distance to the terminal.

[0018] In yet another possible implementation, the target cell obtained by the terminal performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell cell is greater than 0, and the reference distance threshold value of the target cell is greater than the actual distance between the terminal and the center of the target cell.

[0019] According to a third aspect of embodiments of the invention, a cell reselection apparatus is provided, which includes: an acquisition unit configured to obtain a reference threshold value of a cell distance and determine an actual distance between a terminal and a center of a cell; and a processing unit configured to perform cell reselection based on the reference distance threshold and the actual distance.

[0020] In an embodiment, the cell is a serving cell of the terminal, and the processing unit is also configured so that: in response to the cell selection reception level value being greater than the reference signal received power threshold for intra-frequency measurements, the selection quality value cell is greater than the received reference signal quality threshold for intra-frequency measurements, and the reference distance threshold of the serving cell is greater than the actual distance between the terminal and the center of the serving cell, do not perform measurement for intra-frequency neighboring cells.

[0021] In another possible implementation, the target cell obtained by performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell.

[0022] In yet another possible implementation, the processing unit is configured to perform cell reselection based on a reference distance threshold value and an actual distance by: determining R values of a plurality of cells based on a cell reselection criterion R, wherein the plurality of cells includes neighboring cells and a serving cell; in response to the presence of neighboring cells with R values higher than the R value of the serving cell and satisfying the cell reselection criterion S, selecting a neighboring cell with a reference distance threshold value greater than or equal to the actual distance from neighboring cells with R values higher than the value R of the serving cell; in response to the presence of neighboring cells with reference distance thresholds greater than or equal to the actual distances among neighboring cells with R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among neighboring cells with reference distance thresholds greater than or equal to the actual distances. equal to the actual distances, as a reselected cell; and, in response to the absence of a neighboring cell with a reference distance threshold value greater than or equal to the actual distance, among neighboring cells with R values greater than the R value of the serving cell, performing cell reselection based on the reference distance threshold value of the serving cell and the actual distance between the terminal and the center of the serving cell.

[0023] In yet another exemplary implementation, the processing unit is configured to perform cell reselection based on the reference distance threshold of the serving cell and the actual distance between the terminal and the center of the serving cell by the following: in response to the fact that the reference distance threshold of the serving cell is greater than or equal to the actual distance between the terminal and the center of the serving cell, location in the serving cell; and, in response to the reference threshold value of the distance of the serving cell being less than the actual distance between the terminal and the center of the serving cell, selecting a neighboring cell with the largest R value among neighboring cells with R values higher than the R value of the serving cell as the reselected cell.

[0024] In yet another possible implementation, the processing unit is configured to perform cell reselection based on the reference distance threshold and the actual distance by: selecting cells that satisfy the following conditions: cell selection reception level values greater than 0, cell selection quality values greater than 0 , and the reference distance thresholds exceed the actual distances; determining R values of a plurality of cells from the selected cells based on the R criterion for reselecting cells; and, in response to the presence of neighboring cells with the determined R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among the neighboring cells with the determined R values greater than the R value of the serving cell as the reselected cell.

[0025] In yet another possible implementation, the acquisition unit is configured to determine the actual distance between the terminal and the center of the cell by: determining location information of the terminal and obtaining reference cell location information provided by the network device; and determining the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information.

[0026] In yet another possible implementation, the receiving unit is configured to determine the actual distance between the terminal and the cell center by: determining location information of the terminal and transmitting the location information to a network device; and obtaining an actual distance between the terminal and the cell center determined by the network device based on the terminal location information and the reference cell location information.

[0027] In yet another possible implementation, the acquisition unit is configured to obtain a reference cell distance threshold by: obtaining a reference cell distance threshold based on a system broadcast message of a serving cell and/or a neighboring cell.

[0028] According to a fourth aspect of embodiments of the invention, an apparatus for cell reselection is provided, comprising: a transmission unit configured to transmit a reference distance threshold value of a cell, wherein the reference distance threshold value is configured to cause a terminal to perform cell reselection based on the reference distance threshold value and the actual distance between the terminal and the cell center.

[0029] In an embodiment, the transmission unit is also configured to transmit reference cell location information, wherein the reference cell location information is configured to determine an actual distance by the terminal.

[0030] In another possible implementation, the device also includes: an acquisition unit configured to obtain information about the location of the terminal; and a processing unit configured to determine the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information, wherein the transmission unit is also configured to transmit the actual distance to the terminal.

[0031] In yet another possible implementation, the target cell obtained by the terminal performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell cell is greater than 0, and the reference distance threshold value of the target cell is greater than the actual distance between the terminal and the center of the target cell.

[0032] According to a fifth aspect of embodiments of the invention, there is provided a cell reselection apparatus comprising: a processor and a memory for storing instructions executed by the processor, wherein the processor is configured to perform the method described in the first aspect or any of the possible implementations of the first aspect.

[0033] In accordance with a sixth aspect of embodiments of the invention, there is provided a cell reselection apparatus which includes: a processor and a memory for storing instructions executed by the processor, the processor being configured to perform the method described in the second aspect or any of the possible implementations of the second aspect .

[0034] According to a seventh aspect of embodiments of the invention, a computer-readable medium for storing data is provided. When instructions on the storage medium are executed by the processor of the mobile terminal, the mobile terminal executes the method described in the first aspect or any of the possible implementations of the first aspect.

[0035] According to an eighth aspect of embodiments of the invention, a computer-readable medium for storing data is provided. When instructions on a storage medium are executed by a processor of a network device, the network device performs the method described in the second aspect or any of the possible implementations of the second aspect.

[0036] Technical solutions proposed in embodiments of the invention may provide the following advantages. The terminal performs cell reselection based on the reference cell distance threshold and the actual distance between the terminal and the cell center, so that cell reselection is performed in combination with the distance conditions between the terminal and the cell and is further applicable to an NTN network with a large cell radius.

[0037] It should be understood that both the foregoing general description and the following detailed description are illustrative and explanatory only and do not limit the invention.

Brief description of drawings

[0038] The accompanying drawings, which are incorporated into and constitute a part of the present specification, illustrate embodiments in accordance with the invention and, together with the description, explain the principles of the invention.

[0039] FIG. 1 is a diagram of a communication system architecture according to some embodiments.

[0040] FIG. 2 is a flowchart showing a cell reselection method according to some embodiments.

[0041] FIG. 3 is a flowchart showing a cell reselection method according to some embodiments.

[0042] FIG. 4 is a flow diagram showing a method for reselecting a cell based on a reference cell distance threshold and an actual distance between a terminal and a cell center, according to some embodiments.

[0043] FIG. 5 is a flow diagram showing a method for reselecting a cell based on a reference cell distance threshold and an actual distance between a terminal and a cell center, according to some embodiments.

[0044] FIG. 6 is a block diagram showing a cell reselection apparatus according to some embodiments.

[0045] FIG. 7 is a block diagram showing a cell reselection apparatus according to some embodiments.

[0046] FIG. 8 is a block diagram showing a cell reselection apparatus according to some embodiments.

[0047] FIG. 9 is a block diagram showing a cell reselection apparatus according to some embodiments.

Detailed Description of the Invention

[0048] Embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings, with the same reference numerals throughout the drawings representing the same or similar elements unless otherwise indicated. The implementations set forth in the following description of embodiments do not represent all implementations corresponding to the present invention. On the contrary, they are only examples of devices and methods corresponding to the aspects of the present invention set forth in the accompanying claims.

[0049] The information transmission method provided in the embodiments of the invention can be applied to the wireless communication system shown in FIG. 1. As shown in FIG. 1, a wireless communication system includes a terminal 10 and a network device 20. Information is transmitted and received between the terminal 10 and the network device 20 via wireless resources.

[0050] It will be understood that the wireless communication system of FIG. 1 is provided for schematic illustration only. The wireless communication system may also include other network devices, such as a core network device, a wireless relay device, and a wireless backhaul device, which are not shown in FIG. 1. Embodiments of the invention do not limit the number of network devices and the number of terminals included in the wireless communication system.

[0051] It is further understood that the wireless communication system in embodiments of the invention is a network that provides wireless communication functions. The wireless communication system can use various communication technologies, such as Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA, Time Division Multiple Access), multiple access with frequency division multiple access (FDMA, Frequency Division Multiple Access), multiple access with orthogonal frequency division multiple access (OFDMA, Orthogonal Frequency-Division Multiple Access), single carrier FDMA (SC-FDMA , Single Carrier FDMA) or multiple access with carrier sense and collision avoidance. Depending on network throughput, speeds, delays and other factors, the network can be classified as a second generation network (2G, 2-th Generation), a third generation network (3G, 3-rd Generation), a fourth generation network (G4, 4-th Generation) or networks of future development, such as 5G networks. The 5G network may also be called "new radio" (NR, New Radio). For ease of description, a wireless communication network is sometimes referred to in this description as a network for brevity.

[0052] In addition, the network device involved in the description may also be referred to as a wireless access network device. A wireless access network device can be a base station, an evolved base station (evolved node B), a home base station, an access point (AP, Access Point) in a Wi-Fi system, a wireless relay node, a wireless transport network node, a transmission point (TP, Transmission Point), a transmission and reception point (TRP, Transmission and Reception Point), a next generation base station (gNB, Next Generation Node B) in an NR system, or a component or part of a device that makes up the base station. When it comes to a vehicle-to-everything (V2X) communication system, the network device can also be a device installed on the vehicle. In embodiments of the invention, the specific technology and the specific device form used by the network device are not limited.

[0053] In addition, the terminal involved in the description may also be referred to as a terminal device, a user equipment (UE, User Equipment), a mobile station (MS, Mobile Station), a mobile terminal (MT, Mobile Terminal), and the like. , and is a device that provides voice and/or data communications to a user. For example, the terminal may be a portable device, a vehicle-mounted device, or the like with a wireless connection function. Currently, some examples of terminals are smartphones, Pocket Personal Computers (PPCs), laptop computers, personal digital assistants (PDAs), laptops, tablet computers, wearable devices, vehicle-mounted devices, and etc. Additionally, when it comes to a vehicle-to-vehicle (V2X) communication system, the terminal device can also be a device installed on the vehicle. Embodiments of the invention do not limit the specific technology and specific device form used by the terminal.

[0054] Cell selection or reselection is performed during communication between the terminal and the network device. Embodiments of the invention are applicable to a cell selection or reselection process. In the art, the S criterion and the R criterion are used to select or reselect a cell.

[0055] Criterion S refers to Srxlev>0 and Squal>0, where Srxlev is the cell selection reception level (Rx) value and Squal is the cell selection quality value. The cell selected or re-selected by the terminal must satisfy criterion S.

[0056] In addition, for intra-frequency measurements of the terminal, if the serving cell satisfies the conditions Srxlev>SIntraSearchP and Squal>SIntraSearchQ, the terminal may decide not to perform measurements in intra-frequency neighboring cells. ShitraSearchP is the reference signal received power threshold (RSRP) for intra-frequency measurements (also known as the received cell selection threshold for intra-frequency measurements), and SmtraSearchQ is the reference signal received quality threshold (RSRQ). ) for intra-frequency measurements (also known as the quality threshold for cell selection for intra-frequency measurements).

[0057] The R criterion refers to the following: Rs=Qmeas,s + Qhyst-Qoffsettemp, Rn=Qmeas,n - Qoffset - Qoffsettemp, where Rs is the R value of the serving cell, Rn is the R value of the neighboring cell, Qmeas,s is the RSRP measurement value of the serving cell, Qmeas,n is the neighbor cell's RSRP measurement value, Qhyst is the cell reselection hysteresis value, Qoffsettemp is the time offset value, and Qoffset is the offset value. The agreement regarding Qmeas, Qoffset and Qoffsettemp is shown in Table 1 below.

[0058] The above-described cell reselection method based on the S criterion and the R criterion is applicable in a terrestrial network. With the development of communication technologies, the NTN network is being introduced. A network characteristic of the NTN network is a larger cell radius. For an NTN network with a large cell radius, the difference in RSRP or RSRQ when the terminal is at the center or at the edge of a cell is small, and since the cell radius is larger, the cell overlap area is relatively large. Therefore, when the terminal moves and the channel fades (eg, due to an obstacle), cell reselection based on the S criterion and the R criterion may cause the terminal to perform cell reselection back and forth between two cells, and if the cell reselection is performed based on the S criterion and the R criterion, it is difficult to configure reasonable cell reselection parameters.

[0059] Therefore, for an NTN network, due to its network characteristic, the cell reselection method based on the S criterion and the R criterion cannot well solve the problems encountered by the terminal during cell selection/reselection in the NTN network.

[0060] In view of this, embodiments of the invention provide a cell reselection method. The network device provides the terminal with reference cell location information configured to determine a reference cell distance threshold. The distance reference threshold indicates the distance over which a cell can provide good network services. When the actual distance between the terminal and the cell center is less than the reference distance threshold, the cell can provide good network services to the terminal. Good network service provided by a cell can be defined as a cell's signal quality above a given signal quality threshold. The reference distance threshold provided by the network is typically less than the actual cell coverage distance, with the cell's actual coverage distance being characterized by the cell radius. When the terminal performs cell reselection, it performs cell reselection based on the reference cell distance threshold and the actual distance between the terminal and the cell center. It can use a combination of distance conditions between a terminal and a cell to perform cell reselection applicable to cell reselection in an NTN network with a large cell radius.

[0061] FIG. 2 is a flow diagram illustrating a cell reselection method according to some embodiments. As shown in FIG. 2, the following steps are included. The cell reselection method shown in FIG. 2, can be applied in the terminal. Of course, it can also be applied to other devices that can perform the following corresponding methods.

[0062] In step S11, a reference cell distance threshold value is obtained and the actual distance between the terminal and the cell center is determined.

[0063] In some embodiments, the cell corresponding to the reference distance threshold and the actual distance may be a serving cell of the terminal or a neighboring cell of the terminal, which may also be understood as a candidate cell included in the cell reselection candidate list.

[0064] The reference distance threshold may be determined based on the reference cell location information provided by the NTN to the terminal. The cell location reference information may be determined by the network device through a system broadcast message. In some embodiments of the invention, the reference cell location information is primarily used to determine a reference cell distance threshold. Reference cell location information and reference cell distance threshold are sometimes used interchangeably, but those skilled in the art should understand their meaning.

[0065] In step S12, cell reselection is performed based on the reference distance threshold and the actual distance.

[0066] In some embodiments of the invention, the terminal performs cell reselection based on a reference cell distance threshold and the actual distance between the terminal and the cell center to use the combination of terminal-cell distance conditions to perform cell reselection that is suitable for cell reselection in the network NTN with a large cell radius.

[0067] FIG. 3 is a flow diagram of a cell reselection method according to some embodiments. As shown in FIG. 3, the method includes the following steps. The cell reselection method in FIG. 3 can be applied in a network device. Of course, it can also be applied to other devices that can perform the following corresponding methods.

[0068] In step S21, a reference distance threshold value of a cell is transmitted, wherein the reference distance threshold value is configured to cause the terminal to perform cell reselection based on the reference distance threshold value and the actual distance between the terminal and the center of the cell.

[0069] For example, a network device provides a cell distance reference threshold value via a system broadcast message. The terminal obtains the reference cell distance threshold based on the system broadcast message of the serving cell and/or neighboring cell.

[0070] In another example, the actual distance between the terminal and the cell center may be determined by the terminal based on the actual location of the terminal and the actual location information of the cell, or may be determined by the network device based on the actual location of the terminal and the actual location information of the cell.

[0071] When the terminal makes a decision based on the actual location of the terminal and the actual location information of the cell, the terminal location information is determined and the reference cell location information provided by the network device is obtained. The reference cell location information provided by the network device may be determined by ephemeris information (cell network location information) included in the system broadcast message. The network device transmits reference cell location information to the terminal. The terminal obtains the reference cell location information and determines the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information.

[0072] When the network device makes a decision based on the actual location of the terminal and the actual location information of the cell, the terminal determines the terminal location information and transmits the terminal location information to the network device. Terminal location information communicated by the terminal to a network device may be reported based on a measurement of the terminal, such as a measurement value associated with a location reported by the terminal. The network device obtains the terminal location information and determines the actual distance between the terminal and the cell center based on the terminal location information and reference cell location information (ephemeris information). When a network device obtains location information of a terminal, the location information of the terminal can be determined based on the measurement report of the terminal. For example, a network device calculates location information of a terminal based on a location-related measurement value reported by the terminal. After determining the actual distance between the terminal and the cell center, the network device transmits the determined actual distance between the terminal and the cell center to the terminal. The terminal obtains the actual distance between the terminal and the cell center determined by the network device based on the terminal location information and the reference cell location information to determine the actual distance between the terminal and the cell center.

[0073] The cell reselection method used in some embodiments of the invention will be described below in conjunction with practical applications.

[0074] For ease of description, in some embodiments of the invention, Dref is used to represent a reference cell distance threshold and Dmeasure is used to represent the actual distance between the terminal and the center of the cell.

[0075] In some embodiments of the invention, when cell reselection is performed based on the two parameters Dref and Dmeasure, a measurement condition in which the terminal does not start measurements in intra-frequency neighboring cells can be determined based on Dref and Dmeasure. For example, after determining the Dref of a serving cell and the Dmeasure between the terminal and the center of the serving cell, the terminal may decide not to measure intra-frequency neighboring cells when Srxlev>ShitraSearchP, Squal>SIntraSearchQ and Dref>Dmeasure. That is, in response to the terminal's serving cell satisfying the conditions Srxlev>ShitraSearchP, Squal>SIntraSearchQ, and Dref>Dmeasure, the terminal may decide not to measure intra-frequency neighbor cells.

[0076] In some embodiments of the invention, when cell reselection is performed based on two parameters Dref and Dmeasure, the conditions that the cell obtained by performing cell reselection must satisfy can be determined based on Dref and Dmeasure. In the example, the cell obtained by performing cell reselection based on Dref and Dmeasure satisfies the condition Dref>Dmeasure. Additionally, in some embodiments, the cell obtained by performing cell reselection must satisfy criterion S. That is, the cell obtained by performing cell reselection based on Dref and Dmeasure must satisfy the conditions Srxlev>0, Squal>0, and Dref>Dmeasure .

[0077] In some embodiments of the present invention, a cell for cell reselection based on Dref and Dmeasure may be understood as a candidate cell in a list of candidates for cell reselection based on criterion S. The candidate cell may be a serving cell of the terminal or an adjacent cell of the terminal. The target cell obtained by performing cell reselection based on Dref and Dmeasure can be understood as one of the cells satisfying criterion S.

[0078] It is further understood that in some embodiments of the invention, the criterion used in reselecting a cell that satisfies the conditions Srxlev>0, Squal>0 and Dref>Dmeasure may be a newly defined criterion S. The newly defined criterion S may be the following : Srxlev>0, Squal>0 and D>0, where D=Dref-Dmeasure. Dmeasure is the distance between the terminal and the center of the target cell, Dref is the distance reference threshold value of the target cell, Srxlex is the cell selection reception level value of the target cell, and Squal is the cell selection quality value of the target cell. It should be understood that the cell obtained by performing cell reselection based on Dref and Dmeasure, in some embodiments of the invention, must satisfy the above newly defined criterion S.

[0079] In addition, it can be understood that the cell obtained by performing cell reselection based on Dref and Dmeasure in some embodiments of the invention may be a serving cell before the terminal performs cell reselection, or may be a neighboring cell of the terminal.

[0080] In an embodiment, in some embodiments of the invention, Dref and Dmeasure may be used in combination to perform cell reselection after cell reselection has been performed based on the existing S and R criteria.

[0081] In FIG. 4 is a flow diagram of a method for reselecting a cell based on a reference cell distance threshold and an actual distance between a terminal and a cell center, according to some embodiments of the present invention. As shown in FIG. 4, the following steps are included.

[0082] In step S31, the terminal determines the R values of a plurality of cells including neighboring cells and a serving cell based on the cell reselection criterion R.

[0083] In step S32, in response to the presence of neighboring cells with R values greater than the R value of the serving cell and satisfying the cell reselection criterion S, the neighboring cell for which Dref≥Dmeasure is selected from neighboring cells with R values higher than the R value of the serving cell.

[0084] When there are neighboring cells with R values higher than the R value of the serving cell, that is, the determined R value of the neighboring cell is higher than the R value of the serving cell, and these neighboring cells satisfy the criterion S for cell reselection, the terminal needs to use the Dref combination and Dmeasure to determine whether the neighboring cell should be reselected. For example, the terminal selects a neighbor cell with Dref≥Dmeasure from neighboring cells with R values higher than the R value of the serving cell.

[0085] When the terminal selects a neighbor cell with Dref≥Dmeasure from neighboring cells with R values higher than the R value of the serving cell, it can determine whether to select the neighbor cell as a reselected cell based on whether there is a neighbor cell with Dref ≥Dmeasure among neighboring cells with R values higher than the R value of the serving cell.

[0086] In step S33a, in response to the presence of neighboring cells with Dref≥Dmeasure among the neighboring cells with R values higher than the R value of the serving cell, select the neighboring cell with the largest R value among the neighboring cells with Dref≥Dmeasure as the reselected cell.

[0087] In step S33b, in response to the absence of a neighbor cell with Dref≥Dmeasure among neighboring cells with R values higher than the R value of the serving cell, cell reselection is performed based on the reference threshold value of the distance of the serving cell and the actual distance between the terminal and the center of the serving cell. honeycomb

[0088] In an example, when performing cell reselection based on the Dref and Dmeasure of the serving cell, in response to Dref≥Dmeasure for the serving cell, the terminal remains in the serving cell. In response to Dref≤Dmeasure for the serving cell, the neighboring cell with the largest R value among the neighboring cells with an R value higher than the R value of the serving cell is selected as the reselected cell.

[0089] In some embodiments, the terminal sorts the R values of a plurality of cells based on an R criterion. If the R values for N neighboring cells are higher than the R value of the serving cell, P cells satisfying the Dref≥Dmeasure condition are selected from the N neighboring cells. Then, from the P cells, the cell with the largest R value is selected. If P>0, the terminal reselects the selected cell with the largest R value. If P=0 (that is, no neighboring cell satisfies the Dref>≥Dmeasure condition in this case), and, if the serving cell satisfies the Dref≥Dmeasure condition, the terminal remains in the serving cell and does not perform cell reselection. If the serving cell does not satisfy the condition Dref≥Dmeasure (Dref<Dmeasure), the terminal reselects the cell with the largest R value among the N cells.

[0090] In some embodiments of the invention, the cell reselection method described above may be used to reselect a neighbor cell when the R value of the neighbor cell is greater than the R value of the serving cell and the neighbor cell reference distance threshold value is greater than or equal to the actual distance. Moreover, in response to the absence of a neighboring cell satisfying the distance condition between Dref and Dmeasure, if the serving cell satisfies the distance condition, the terminal remains in the serving cell. In response to there being no neighboring cells that satisfy the distance conditions between Dref and Dmeasure, and the serving cell not satisfying the distance conditions, it is located in a neighboring cell with a higher R value.

[0091] In another possible implementation, the terminal may perform cell reselection in accordance with the newly defined criterion S.

[0092] In FIG. 5 is a flow diagram of a method for reselecting a cell based on a reference cell distance threshold and an actual distance between a terminal and a cell center, according to some embodiments of the present invention. As shown in FIG. 5, the following steps are included.

[0093] In step S41, the terminal selects a plurality of cells satisfying the newly determined criterion S based on the newly determined criterion S (Srxlev>0 and Squal>0 and D>0).

[0094] In step S42, the R values of the set of cells satisfying the newly determined criterion S are determined based on the cell reselection criterion R.

[0095] In step S43, in response to the presence of neighboring cells with certain R values higher than the R value of the serving cell, the neighboring cell with the largest R value is selected as a reselected cell among the neighboring cells with certain R values higher than the R value of the serving cell .

[0096] In some embodiments of the present invention, when a terminal performs cell reselection based on Dref and Dmeasure, Dref and Dmeasure are applied to neighboring cell measurements, the S criterion, and the R criterion. This may be applicable for cell reselection in an NTN network with a large cell radius . Selecting a cell that satisfies the Dref>Dmeasure condition may prevent the terminal from performing a round-trip cell reselection between two cells.

[0097] The cell reselection method provided in some embodiments of the present invention is also applicable to the interaction process between a terminal and a network device. In the example, the network device determines Dref via a system broadcast message. The terminal obtains the Dref of each cell from the system broadcast messages of the serving cell and/or neighboring cell and obtains ephemeris information (reference cell location information) from the system broadcast messages. The terminal determines its location, for example, determines its own location based on Global Positioning System (GPS) data, and determines the Dmeasure between it and the cell center in combination with ephemeris information received from the network device. When the terminal performs cell selection or reselection, it selects a plurality of cells that satisfy the newly defined criterion S used in the above scheme and applies criterion R to the selected cells. The terminal reselects the cell with the largest R value. If the cell with the largest R value is the current serving cell, the terminal does not reselect the cell and continues to remain in the current cell. Alternatively, when the terminal performs cell selection or reselection, it selects a plurality of cells satisfying the existing criterion S, applies the criterion R to the selected cells, and then uses Dref and Dmeasure in combination to perform cell reselection.

[0098] In some embodiments of the invention, for the process of interaction between a terminal and a network device to implement paging in an unlicensed frequency band or in a licensed frequency band, reference may be made to the corresponding description of the preceding embodiments, and the details are again not described here.

[0099] Based on the same concept, some embodiments of the invention also provide a cell reselection device.

[00100] It is understood that in order to implement the functions described above, the cell reselection device proposed in some embodiments of the invention includes hardware structures and/or software modules for implementing various functions. In combination with the blocks and steps of the example algorithm disclosed in the embodiments of the invention, embodiments of the invention may be implemented in hardware or a combination of hardware and computer software. Whether a particular function is performed by hardware or by hardware controlled by computer software depends on the specific application and the design constraints of the solution. Various methods may be used by those skilled in the art for each particular application to implement the described functions, and such implementation should not be construed as being outside the scope of the technical solutions of the embodiments of the invention.

[00101] FIG. 6 is a block diagram of a cell reselection apparatus according to some embodiments. As shown in FIG. 6, the cell reselection device 100 includes a receiving unit 101 and a processing unit 102. The acquisition unit 101 is configured to obtain a reference cell distance threshold value and determine the actual distance between the terminal and the cell center. The processing unit 102 is configured to perform cell reselection based on the reference distance threshold and the actual distance.

[00102] In the implementation, the cell is a serving cell of the terminal, and the processing unit 102 is also configured so that: in response to the cell selection reception level exceeding the cell selection reception level threshold value for intra-frequency measurements, the cell selection quality value is higher , than the cell selection quality threshold for intra-frequency measurements, and the reference distance threshold of the serving cell is larger than the actual distance between the terminal and the center of the serving cell, do not perform measurement for neighboring intra-frequency cells. This is represented by the conditions Srxlev>SmtraSearchP and Squal>SIntraSearchQ, where Srxlev is the cell selection reception level value, SIntraSearchP is the cell selection reception level threshold for intra-frequency measurements, Squal is the cell selection quality value, and SIntraSearchQ is the cell selection quality threshold for intra-frequency measurements.

[00103] In another implementation method, the target cell obtained by performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell.

[00104] In yet another implementation method, processing unit 102 is configured to perform cell reselection based on a reference distance threshold and actual distance by: determining R values of a plurality of cells based on a cell reselection criterion R, wherein the plurality of cells includes neighboring cells and a serving cell ; in response to the presence of neighboring cells with R values higher than the R value of the serving cell and satisfying the cell reselection criterion S, selecting a neighboring cell with a reference distance threshold value greater than or equal to the actual distance from neighboring cells with R values higher than the value R of the serving cell; in response to the presence of neighboring cells with reference distance thresholds greater than or equal to the actual distances, among neighboring cells with R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among neighboring cells with reference distance thresholds greater than or equal to the actual distances. equal to the actual distances, as a reselected cell; and, in response to the absence of a neighboring cell with a reference distance threshold value greater than or equal to the actual distance, among neighboring cells with R values greater than the R value of the serving cell, performing cell reselection based on the reference distance threshold value of the serving cell and the actual distance between the terminal and the center of the serving cell.

[00105] In another implementation method, the processing unit 102 is configured to perform cell reselection based on the reference distance threshold value of the serving cell and the actual distance between the terminal and the center of the serving cell by the following: in response to the fact that the reference distance threshold value of the serving cell is greater than or equal to the actual distance between the terminal and the center of the serving cell, location in the serving cell; and, in response to the reference threshold value of the distance of the serving cell being less than the actual distance between the terminal and the center of the serving cell, selecting a neighboring cell with the largest R value among neighboring cells with R values higher than the R value of the serving cell as the reselected cell.

[00106] In another implementation method, the processing unit 102 is configured to perform cell reselection based on the reference distance threshold value and the actual distance by: selecting cells that satisfy the following conditions: cell selection reception level values greater than 0, cell selection quality values greater than 0 , and the reference distance thresholds are larger than the actual distances; determining R values of a plurality of cells from the selected cells based on the R criterion for cell reselection; and, in response to the presence of neighboring cells with the determined R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among the neighboring cells with the determined R values greater than the R value of the serving cell as the reselected cell.

[00107] In yet another implementation method, the acquisition unit 101 is configured to determine the actual distance between the terminal and the cell center by: determining terminal location information and obtaining reference cell location information provided by the network device; and determining the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information.

[00108] In yet another implementation method, the acquisition unit 101 is configured to determine the actual distance between the terminal and the cell center by: determining location information of the terminal and transmitting the location information to the network device; and obtaining an actual distance between the terminal and the cell center determined by the network device based on the terminal location information and the reference cell location information.

[00109] In yet another implementation method, the acquisition unit 101 is configured to obtain a reference cell distance threshold value by obtaining a reference cell distance threshold value based on a system broadcast message of a serving cell and/or a neighboring cell.

[00110] FIG. 7 is a block diagram of a cell reselection apparatus according to some embodiments. As shown in FIG. 7, the cell reselection device 200 includes a transmission unit 201.

[00111] The transmission unit 201 is configured to transmit a reference distance threshold value of a cell, wherein the reference distance threshold value is configured to cause the terminal to reselect a cell based on the reference distance threshold value and the actual distance between the terminal and the center of the cell.

[00112] In an exemplary implementation, transmitting unit 201 is also configured to transmit reference cell location information, wherein the reference cell location information is configured to determine an actual distance by the terminal.

[00113] In another possible implementation, device 200 also includes: an acquisition unit 203 configured to receive terminal location information; and a processing unit 202 configured to determine the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information, wherein the transmission unit is also configured to transmit the actual distance to the terminal.

[00114] In yet another possible implementation, the target cell obtained by the terminal performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell cell is greater than 0, and the reference threshold distance of the target cell is greater than the actual distance between the terminal and the center of the target cell.

[00115] As for the devices in the previous embodiments, the specific methods for performing operations for individual modules therein have been described in detail in the method embodiments and will not be described in detail here.

[00116] FIG. 8 is a block diagram of a cell reselection apparatus 300 according to some embodiments. For example, device 300 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet, a medical device, a fitness device, a personal digital assistant, or the like.

[00117] As shown in FIG. 8, device 300 may include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an I/O interface 312, a sensor component 314, and communication component 316.

[00118] Processing component 302 typically controls general operations of device 300, such as display-related operations, telephone calls, data transfer, camera operation, and recording operations. Processing component 302 may include one or more processors 320 for executing instructions to perform all or part of the steps in the methods described above. In addition, processing component 302 may include one or more modules that provide interaction between processing component 302 and other components. For example, processing component 302 may include a media module that provides interaction between multimedia component 308 and processing component 302.

[00119] Memory 304 is configured to store various types of data to support the operation of device 300. Examples of such data include commands for any applications or methods running on device 300, contact data, phone book data, messages, images, video data, and the like. . Memory 304 may be implemented using any type of volatile or non-volatile memory devices of any type or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM) , erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory), programmable read-only memory (PROM, Programmable Read-Only Memory), read-only memory (ROM, Read-Only Memory), magnetic memory, flash memory, magnetic or optical disk.

[00120] Power component 306 provides power to various components of device 300. Power component 306 may include a power management system, one or more power supplies, and any other components associated with the generation, control, and distribution of electrical power in device 300.

[00121] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen may be a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input from the user. The touchpad contains one or more haptic sensors to sense touches, swipes, and gestures on the touchpad. Tactile sensors can not only detect the area of touching or sliding, but also detect the duration and pressure associated with touching or sliding operations. In some embodiments, media component 308 includes a front camera and/or a rear camera. The front camera and/or rear camera may receive external media data while the device 300 is in an operating mode, such as a photo mode or a video mode. Each of the front and rear cameras can be equipped with a fixed optical lens system or have optical focusing and zoom capabilities.

[00122] Audio component 310 is configured to output and/or input audio signals. For example, audio component 310 includes a microphone (MIC) that is configured to receive an external audio signal when device 300 is in an operating mode, such as calling mode, recording mode, and voice recognition mode. The received audio signal may then be stored in memory 304 or transmitted through communication component 316 . In some embodiments, audio component 310 includes a speaker for outputting audio signals.

[00123] Input/output (I/O) interface 312 provides an interface between processing component 302 and peripheral interface modules such as a keyboard, mouse wheel, buttons, and the like. These buttons may include, but are not limited to: a home button ", volume button, start button and lock button.

[00124] Sensor component 314 includes one or more sensors to provide estimates of various aspects of the operation of device 300. For example, sensor component 314 may detect the open/closed state of device 300, the relative position of components such as the display and keyboard of device 300, and changes in the position of device 300. or component of device 300, the presence or absence of user contact with device 300, orientation or acceleration/deceleration of device 300, and temperature change of device 300. Sensor component 314 may also include a proximity sensor configured to detect the presence of nearby objects without physical contact with them. Sensor component 314 may also include an optical sensor, such as a Complementary Metal Oxide Semiconductor (CMOS) or Charge Coupled Device (CCD) image sensor, for use in imaging applications. In some embodiments, the sensor component 314 may also include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[00125] Communications component 316 is configured to provide wired or wireless communications between device 300 and other devices. Device 300 may access a wireless network based on communication standards such as WiFi, 2G, or 3G, or a combination thereof. In one embodiment, communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast control system via a broadcast channel. In one embodiment, communication component 316 also includes a Near Field Communication (NFC) module for short range communications. For example, an NFC module can be implemented based on radio frequency identification technology (RFID, Radio Frequency Identification), technology developed by the infrared data association (IrDA, Infrared Data Association), ultra-wideband (UWB, Ultra-Wideband) communication technology, Bluetooth (BT) technology and other technologies.

[00126] In embodiments, device 300 may be implemented using one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs). ), programmable logic devices (PLD, Programmable Logic Device), field programmable gate arrays (FPGA, Field Programmable Gate Array), controllers, microcontrollers, microprocessors, or other electronic components designed to perform the methods described above.

[00127] Embodiments also provide a computer-readable storage medium containing instructions, such as included in memory 304 and executed by processor 320 in device 300, to perform the methods described above. For example, the computer-readable storage medium may be read-only memory (ROM), random access memory (RAM), CD-ROM (Compact Disk Read Only Memory), magnetic tape, floppy disk, optical device data storage, etc.

[00128] FIG. 9 is a block diagram illustrating a cell reselection apparatus 400 according to some embodiments. For example, device 400 may be provided as a network device such as a base station or the like. As shown in FIG. 9, device 400 includes a processing component 422, which includes one or more processors, and a memory resource, represented by memory 432, for storing instructions executed by the processing component 422, such as application programs. The application program stored in memory 432 may contain one or more modules, each of which corresponds to a set of instructions. In addition, the processing component 422 is configured to execute instructions to implement the methods described above.

[00129] The device 400 may also include a power component 426 configured to manage power to the device 400, a wired or wireless network interface 450 configured to connect the device 400 to a network, and an input/output interface 458. Device 400 may operate based on an operating system stored in memory 432, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, and the like.

[00130] Some embodiments also provide a computer-readable storage medium containing instructions, such as a memory 432 containing instructions that can be executed by processing component 422 of device 400 to perform the methods described above. For example, the computer-readable storage medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical storage device, and the like.

[00131] It should be understood that the word "multiple" mentioned in the description may refer to two or more objects, and other quantities are similar. The combination "and/or" can describe the connection relationship of the corresponding objects, indicating that there can be three types of relationships, for example, "A and/or B" can mean: A exists separately, A and B exist simultaneously, and B exists separately . The "/" symbol usually indicates that the related objects before and after the symbol are in an "or" relationship. It is further understood that in the description, singular forms are intended to also include plural forms unless the context clearly indicates other meanings.

[00132] It should be understood that although the terms "first", "second", etc. may be used to describe a variety of information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type and do not indicate a specific order or degree of importance. In fact, expressions such as the first and second can be used interchangeably. For example, within the spirit of the invention, the first information may also be referred to as second information, and likewise, the second information may also be referred to as first information.

[00133] It is further understood that, unless otherwise indicated, the term “related” includes a direct connection between two components without other components, and also includes an indirect connection between two components with other elements.

[00134] It is further understood that although the operations in embodiments of the invention are shown in a particular order in the drawings, this should not be understood as requiring those operations to be performed in the particular order shown or in a sequential order, or as requiring all operations shown to be performed to obtain desired result. Multitasking and parallel processing can be beneficial in certain circumstances.

[00135] Other embodiments of the invention will be apparent to those skilled in the art from consideration of the description and application of the invention disclosed herein. This application is intended to cover any modifications, uses or adaptations of the invention in accordance with its general principles, including such departures from the description as are known or customary practice in the art. The description and examples are to be considered as illustrative only and the spirit of the invention is defined by the following claims.

[00136] It should be understood that the present invention is not limited to the precise structure that has been described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the spirit of the invention. It is intended that the scope of the invention be limited only by the appended claims.

Claims (54)

1. A cell reselection method performed by a terminal and including: obtaining a reference distance threshold value of the cell and determining an actual distance between the terminal and the center of the cell, wherein the reference distance threshold value is a distance to a reference location of the cell; And perform cell reselection based on reference threshold value distance and actual distance. 2. The method of claim 1, wherein the cell is a serving cell of the terminal, and, in response to the cell selection reception level value being greater than a cell selection reception level threshold value for intra-frequency measurements, the cell selection quality value is greater than , than the cell selection quality threshold for intra-frequency measurements, and the reference distance threshold of the serving cell is greater than the actual distance between the terminal and the center of the serving cell, do not perform measurement for intra-frequency neighboring cells. 3. The method according to claim 1, wherein the target cell obtained by performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value for the target cell is greater than 0, the cell selection quality value for the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell. 4. The method of claim 1 or 3, wherein performing cell reselection based on the reference distance threshold and the actual distance comprises: determining (S31) values R of a plurality of cells based on a criterion R for cell reselection, wherein the plurality of cells includes neighboring cells and a serving cell; in response to the presence of neighboring cells with R values higher than the R value serving cell, and satisfying the cell reselection criterion S, selecting a neighboring cell with a reference distance threshold value greater than or equal to the actual distance from neighboring cells with R values higher than the R value of the serving cell; in response to the presence of neighboring cells with reference distance thresholds greater than or equal to the actual distances among neighboring cells with R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among neighboring cells with reference distance thresholds greater than or equal to the actual distances. equal to the actual distances, as a reselected cell; And, in response to the absence of a neighboring cell with a reference threshold value distance greater than or equal to the actual distance, among neighboring cells with R values greater than the R value of the serving cell, performing cell reselection based on the reference threshold value of the distance of the serving cell and the actual distance between the terminal and the center of the serving cell. 5. The method of claim 4, wherein performing cell reselection based on the reference threshold value of the distance of the serving cell and the actual distance between the terminal and the center of the serving cell includes: in response to the fact that the reference threshold distance of the serving cell is greater than or equal to the actual distance between the terminal and the center of the serving cell, being in the serving cell; And, in response to the reference threshold value of the distance of the serving cell being less than the actual distance between the terminal and the center of the serving cell, selecting the neighboring cell with the largest R value among neighboring cells with R values higher than the R value of the serving cell as the reselected cell. 6. The method of claim 1 or 3, wherein performing cell reselection based on the reference distance threshold and the actual distance comprises: selecting cells that satisfy the following conditions: cell selection reception level values are greater than 0, cell selection quality values are greater than 0, and reference distance thresholds are greater than actual distances; determining R values of a plurality of cells from the selected cells based on the R criterion for cell reselection; And, in response to the presence of neighboring cells with certain R values greater than the R value of the serving cell, selecting the neighbor cell with the largest R value among the neighboring cells with certain R values greater than the R value of the serving cell as the reselected cell. 7. Method according to any one of paragraphs. 1-6, in which the definition of actual distances between the terminal and the cell center include: determining terminal location information and obtaining reference cell location information provided by the network device; And determining the actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information. 8. Method according to any one of paragraphs. 1-7, in which the determination of the actual distance between the terminal and the cell center includes: determining location information of the terminal and transmitting the location information to the network device; And obtaining the actual distance between the terminal and the cell center determined by the network device based on the terminal location information and the reference cell location information. 9. Method according to any one of paragraphs. 1-8, in which obtaining a reference cell distance threshold includes: obtaining a reference cell distance threshold based on the broadcast system message of the serving cell and/or neighboring cell. 10. A cell reselection method performed by a network device and including: transmitting a reference distance threshold value of a cell, wherein the reference distance threshold value is configured to cause the terminal to perform cell reselection based on the reference distance threshold value and an actual distance between the terminal and the center of the cell, and the reference distance threshold value is a distance to a reference location of the cell. 11. The method according to claim 10, also including: transmitting reference cell location information, wherein the reference cell location information is configured to determine an actual distance by the terminal. 12. The method according to claim 10, also including: obtaining information about the location of the terminal; determining an actual distance between the terminal and the cell center based on the terminal location information and the reference cell location information; And transmission of the actual distance to the terminal. 13. Method according to any one of paragraphs. 10-12, in which the target cell obtained by the terminal performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: the cell selection reception level value of the target cell is greater than 0, the cell selection quality value of the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell. 14. A device for cell reselection, comprising: an acquisition unit configured to obtain a reference distance threshold value of a cell and determine an actual distance between the terminal and a center of the cell, wherein the reference distance threshold value is a distance to a reference location of the cell; And a processing unit configured to perform cell reselection based on the reference distance threshold and the actual distance. 15. The apparatus of claim 14, wherein the target cell obtained by performing cell reselection based on the reference distance threshold value and the actual distance satisfies the following conditions: a cell selection reception level value for the target cell is greater than 0, a cell selection quality value for the target cell is greater than 0, and the target cell distance reference threshold value is greater than the actual distance between the terminal and the center of the target cell. 16. A device for cell reselection, comprising: a transmission unit configured to transmit a reference distance threshold value of a cell, wherein the reference distance threshold value is configured to cause the terminal to reselect a cell based on the reference distance threshold value and an actual distance between the terminal and the center of the cell, and the reference distance threshold value is a distance to the reference location honeycomb 17. A device for cell reselection, comprising: processor and memory for storing instructions executed by the processor, wherein the processor is configured to perform the method of any one of claims. 1-9. 18. A device for cell reselection, comprising: processor and memory for storing instructions executed by the processor, wherein the processor is configured to perform the method of any one of claims. 10-13. 19. A computer-readable data storage medium on which instructions are stored that, when executed by a processor of the mobile terminal, cause the mobile terminal to execute the method of any one of claims. 1-9. 20. A computer-readable storage medium on which instructions are stored that, when executed by a processor of a network device, cause the network device to execute the method of any one of claims. 10-13.