A cell reselection method and device

Abstract

The present application relates to a cell reselection method and device. When performing cell reselection, determine whether there is a cell in the first candidate cell that meets the first condition. If the first cell in the first candidate cell meets the first condition, reselect to the first cell. Among them, the first condition is related to the coverage enhancement gain of the cell, which is equivalent to establishing a relationship between the judgment condition for the terminal device to perform cell reselection and the support of the cell for coverage enhancement, taking into account the impact of coverage enhancement on cell reselection. In this way, the terminal device can be made to reselect to the cell that supports coverage enhancement as easily as possible, thereby improving the communication quality of the terminal device.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 1, 2021, with application number 202110225663.3 and application name “A method, terminal and network device for cell reselection”, the entire contents of which are incorporated by reference in this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a cell reselection method and device. Background Art

[0004] Reduced capability UE (redcap UE) has a lower number of antennas and working bandwidth, and a longer processing time than legacy UE due to the reduced hardware capabilities. Legacy UEs generally have 4 antennas (4R), while redcap UEs have fewer antennas, such as 1 antenna (1R). If the distances between the legacy UE and the redcap UE and the base station are the same, the reference signal receiving power (RSRP) value measured by the redcap UE will be smaller than the RSRP value measured by the legacy UE.

[0005] When performing cell reselection, the user equipment (UE) needs to compare the RSRP measured in the neighboring cell with the RSRP threshold of the neighboring cell. The RSRP value measured needs to be greater than the RSRP threshold to have a chance to reselect to other cells. Currently, the RSRP threshold used by redcap UEs when performing cell reselection is the same RSRP threshold as that of legacy UEs. Since the RSRP value measured by legacy UEs is larger, the RSRP threshold used by the corresponding legacy UEs is also larger. However, due to the limited capabilities of redcap UEs, the RSRP value measured by them may be smaller. Therefore, if the redcap UE performs cell reselection based on such an RSRP threshold, it is likely that it will not be able to reselect to a neighboring cell.

[0006] At present, some cells support coverage enhancement technology in order to improve the coverage capability of UE. For example, through repeated transmission or power control, UE with weaker capabilities (such as redcap UE) can also receive data normally. For example, when a redcap UE cannot receive data normally in the serving cell and reselects a cell, the neighboring cell of the serving cell supports coverage enhancement, but the serving cell does not support coverage enhancement. In this case, the better choice for the redcap UE is to reselect to a neighboring cell that supports coverage enhancement. However, as mentioned above, since the RSRP value measured by the redcap UE is small, and the RSRP threshold of the neighboring cell is large, the redcap UE may not be able to reselect to the neighboring cell. Summary of the invention

[0007] Embodiments of the present application provide a cell reselection method and device for increasing the probability of a UE reselecting a cell that supports coverage enhancement.

[0008] In a first aspect, a cell reselection method is provided, which can be executed by a terminal device, or by a larger device including the terminal device, or by a chip system or other functional module, which can implement the functions of the terminal device. The method includes: when performing cell reselection, determining whether there is a cell in a first candidate cell that meets a first condition, the first candidate cell includes one or more cells; if a first cell in the first candidate cell meets the first condition, reselecting to the first cell. Wherein, the first cell meets the first condition including: the first cell meets that the value of a first parameter within a first time length is greater than a first value, the first value is related to a second parameter of the first cell, and the second parameter is used to indicate the gain of coverage enhancement of a cell.

[0009] In an embodiment of the present application, when a terminal device performs cell reselection, to determine whether it can reselect to the first cell, it can determine whether the first cell satisfies the first condition. If the first condition is satisfied, the first cell can be reselected. The first condition involves a first value, and the first value is, for example, related to a quality threshold of a neighboring cell during cell reselection. In addition, the first value is also related to the gain of coverage enhancement of the first cell, that is, a relationship is established between the judgment condition for the terminal device to perform cell reselection and the support of the cell for coverage enhancement, and the impact of coverage enhancement on cell reselection is taken into account. In this way, the terminal device can be made to reselect to a cell that supports coverage enhancement as easily as possible, thereby improving the communication quality of the terminal device.

[0010] In combination with the first aspect, in a first optional implementation of the first aspect, the first parameter is RSRQ or RSRP. In addition, the first parameter may also be other parameters, for example, any parameter that can indicate the quality of a cell may be used as the first parameter.

[0011] In combination with the first optional implementation of the first aspect, in the second optional implementation of the first aspect, the first parameter is RSRQ, the first value is the difference between the first threshold and the value of the second parameter of the first cell, and the first threshold is the value threshold of the RSRQ of the cell during cell reselection; and / or, the first parameter is RSRP, the first value is the difference between the second threshold and the value of the second parameter of the first cell, and the second threshold is the value threshold of the RSRP of the cell during cell reselection. This implementation takes into account the impact of coverage enhancement on cell reselection, and reduces the RSRP threshold of the cell supporting coverage enhancement by adding the second parameter, so that the terminal device can more easily reselect to the cell supporting coverage enhancement.

[0012] In combination with the first optional implementation of the first aspect, in a third optional implementation of the first aspect, the first value is related to the second parameter and the third parameter, and the third parameter is used to indicate the coverage enhancement gain of the serving cell of the terminal device. In this implementation, the first value is related to the support of the cell to be reselected for coverage enhancement as well as the support of the serving cell for coverage enhancement, which is equivalent to considering both the impact of the coverage enhancement of the neighboring cell on the cell reselection and the impact of the coverage enhancement of the serving cell on the cell reselection, thereby minimizing the problem that the terminal device will still reselect to the neighboring cell of the high priority frequency that does not support coverage enhancement when the serving cell supports coverage enhancement.

[0013] In combination with the third optional implementation manner of the first aspect, in a fourth optional implementation manner of the first aspect, the first parameter is RSRQ, S=Q+offset s -offset n , S represents the first value, Q represents the first threshold, offset s Indicates the value of the third parameter, offset n represents the value of the second parameter of the first cell, the first threshold is the value threshold of the RSRQ of the first cell during cell reselection; and / or the first parameter is RSRP, S=P+offset s -offset n , S represents the first value, offset s Indicates the value of the third parameter, offset nrepresents the value of the second parameter of the first cell, P represents the second threshold, and the second threshold is the value threshold of the RSRP of the first cell during cell reselection. The implementation method of the first value is given, and of course the implementation method of the first value is not limited to this. This method can make the terminal device reside in the cell supporting coverage enhancement as much as possible by considering whether the serving cell and the cell to be reselected support coverage enhancement.

[0014] In combination with the first aspect or any one of the first optional implementation manners of the first aspect to the fourth optional implementation manner of the first aspect, in the fifth optional implementation manner of the first aspect, the method further includes: when none of the first candidate cells meet the first condition, determining whether there is a cell in the second candidate cell that meets the second condition; and when the second cell in the second candidate cell meets the second condition, reselecting to the second cell. Wherein, the second cell meets the second condition including: the serving cell of the terminal device meets that the value of the first parameter is less than the second value within the first duration, and the second cell meets that the value of the first parameter is greater than the third value within the first duration, the second value is related to the third parameter, the third value is related to the second parameter of the second cell, and the third parameter is used to indicate the coverage enhancement gain of the serving cell. If none of the first candidate cells meet the first condition, the terminal device can determine whether there is a cell in the second candidate cell that meets the second condition. The condition involves the second value and the third value, for example, the third value is related to the quality threshold of the neighboring cell (or the cell to be reselected) during cell reselection, and the second value is related to the quality threshold of the serving cell during cell reselection. In addition, the third value is also related to the coverage enhancement gain of the second cell, and the second value is also related to the coverage enhancement gain of the service cell. That is to say, a relationship is established between the judgment condition of the terminal device and the support of the coverage enhancement by the neighboring cell and the service cell, and the impact of coverage enhancement on cell reselection is taken into account. In this way, the terminal device can be made to reselect to the cell that supports coverage enhancement more easily, thereby improving the communication quality of the terminal device.

[0015] In combination with the fifth optional implementation of the first aspect, in the sixth optional implementation of the first aspect, the first parameter is RSRQ, the second value is the sum of the third threshold and the value of the third parameter, and the third threshold is the value threshold of the RSRQ of the serving cell during cell reselection; and / or, the first parameter is RSRP, the second value is the sum of the fourth threshold and the value of the third parameter, and the fourth threshold is the value threshold of the RSRP of the serving cell during cell reselection. The implementation method of the second value is given, and of course the implementation method of the second value is not limited to this.

[0016] In combination with the fifth optional implementation of the first aspect or the sixth optional implementation of the first aspect, in the seventh optional implementation of the first aspect, the first parameter is RSRQ, the third value is the difference between the fifth threshold and the value of the second parameter of the second cell, and the fifth threshold is the value threshold of the RSRQ of the one cell during cell reselection; and / or, the first parameter is RSRP, the third value is the difference between the sixth threshold and the value of the second parameter of the second cell, and the sixth threshold is the value threshold of the RSRP of the one cell during cell reselection. The implementation method of the third value is given, and of course the implementation method of the third value is not limited to this.

[0017] In combination with the first aspect or any one of the first optional implementation manners of the first aspect to the fourth optional implementation manner of the first aspect, in an eighth optional implementation manner of the first aspect, the method further includes: when none of the first candidate cells meet the first condition, determining a measurement value of a third candidate cell, the third candidate cell includes a first type of cell and a second type of cell, the first type of cell supports coverage enhancement, the second type of cell does not support coverage enhancement, the measurement value of the first type of cell is determined according to the value of the first parameter obtained by the terminal device measuring the first type of cell and the value of the second parameter of the first type of cell; and reselecting to a third cell in the third candidate cell according to the measurement value of the third candidate cell. If none of the first candidate cells meet the first condition, the terminal device may determine the measurement value of the first type of cell. Alternatively, if none of the first candidate cells meet the first condition and none of the second candidate cells meet the second condition, the terminal device may continue to select in the third candidate cell. Among them, the terminal device selects in the third candidate cell, and there may be multiple selection methods, and the first method is introduced here. This method makes the measurement value of the third candidate cell related to whether the cell supports coverage enhancement, which is equivalent to establishing a relationship between the judgment condition of the terminal device during cell reselection and the support of the cell to be reselected for coverage enhancement, taking into account the impact of coverage enhancement on cell reselection. In this way, the terminal device can be made to reselect to a cell that supports coverage enhancement as easily as possible, thereby improving the communication quality of the terminal device.

[0018] In combination with the eighth optional implementation of the first aspect, in the ninth optional implementation of the first aspect, the third cell is the cell with the largest measurement value among the third candidate cells; or, the third cell is the cell with the largest number of downlink beams whose measurement value belongs to the first interval and whose corresponding number is greater than the first quality threshold, and the first interval is used to indicate the best cell range. If the network does not configure the best cell range, the terminal device may sort the cells included in the third candidate cell according to the relationship from large to small in the measurement value, and reselect to the cell with the largest measurement value. If the network configures the best cell range, the terminal device may sort the cells included in the third candidate cell according to the relationship from large to small in the measurement value, and select a third type of cell therefrom, the third type of cell includes one or more cells, the third type of cell is a cell whose measurement value is within the first interval, the first interval may indicate the best cell range, or the first interval may also be other interval ranges. Each cell has a corresponding number of downlink beams, and the terminal device may reselect to the cell with the largest number of corresponding downlink beams among the third type of cells, thereby obtaining better communication quality.

[0019] In combination with the first aspect or any of the first optional implementation manners of the first aspect to the fourth optional implementation manner of the first aspect, in the tenth optional implementation manner of the first aspect, the method further includes: when none of the first candidate cells meet the first condition, determining a first part of cells from the third candidate cells, the first part of cells including at least one cell; and reselecting to a third cell in the at least one cell. If none of the first candidate cells meet the first condition, the terminal device may determine the measurement value of the first type of cell. Alternatively, if none of the first candidate cells meet the first condition, and none of the second candidate cells meet the second condition, the terminal device may continue to select in the third candidate cell. Among them, the terminal device may select in the third candidate cell, and there may be multiple selection methods. For example, the terminal device may select the first part of cells from the third candidate cells, and then select the third cell from the first part of cells. If no cell in the third candidate cell meets the requirements of the first part of cells, indicating that there is no cell suitable for reselection, the terminal device may stop cell reselection to save power consumption of the terminal device and reduce the probability of the terminal device selecting a poor cell.

[0020] In combination with the tenth optional implementation of the first aspect, in the eleventh optional implementation of the first aspect, the measurement values ​​of the at least one cell are all greater than the seventh threshold, and the measurement value of one cell in the at least one cell is determined according to the value of the first parameter obtained by the terminal device measuring the one cell. This implementation does not need to add a second parameter to the cell supporting coverage enhancement, but sets a seventh threshold for the first parameter (such as RSRP or RSRQ), and reselects in the cell that exceeds the seventh threshold. Compared with the solution of adding a second parameter to the cell supporting coverage enhancement, this implementation is simpler.

[0021] In combination with the eleventh optional implementation of the first aspect, in the twelfth optional implementation of the first aspect, the third cell is a cell that supports coverage enhancement and has the largest measurement value among the at least one cell. That is, when the terminal device performs cell reselection, it not only considers the measurement value, but also considers the support for coverage enhancement, and tries to reselect to a cell that supports coverage enhancement.

[0022] In combination with the tenth optional implementation of the first aspect, in the thirteenth optional implementation of the first aspect, the measurement values ​​of the at least one cell are all within the first interval, and the number of downlink beams corresponding to the at least one cell that is greater than the first quality threshold is greater than the eighth threshold, and the first interval is used to indicate the best cell range. This implementation method is applicable to the case where the network is configured with the best cell range. The eighth threshold is, for example, determined by the terminal device itself, or configured by the network device, or may also be specified by a protocol. This implementation method does not need to add a second parameter to the cell that supports coverage enhancement, but sets an eighth threshold for the first parameter (such as RSRP or RSRQ), and reselects in the cell that exceeds the eighth threshold. Compared with the solution of adding a second parameter to the cell that supports coverage enhancement, this implementation method is simpler. Moreover, a cell with a large number of downlink beams is first selected, and cell reselection is performed therefrom, so that a cell with a large number of downlink beams can be selected as much as possible to improve the communication quality of the terminal device.

[0023] In combination with the thirteenth optional implementation manner of the first aspect, in the fourteenth optional implementation manner of the first aspect, the third cell is a cell that supports coverage enhancement and has the largest number of corresponding downlink beams greater than the first quality threshold among the at least one cell. That is to say, when performing cell reselection, the terminal device not only considers the number of downlink beams, but also considers the support for coverage enhancement, and tries to reselect to a cell that supports coverage enhancement.

[0024] In combination with the tenth optional implementation of the first aspect, in a fifteenth optional implementation of the first aspect, the measurement values ​​of the at least one cell are all within the first interval. This implementation is applicable to the case where the network configures the best cell range, for example, the first interval may indicate the best cell range.

[0025] In combination with the fifteenth optional implementation of the first aspect, in the sixteenth optional implementation of the first aspect, the method also includes: determining an adjustment value of the number of downlink beams of the cell supporting coverage enhancement in the at least one cell, the adjustment value being determined based on the number of downlink beams of the cell supporting coverage enhancement and a fourth parameter, and the fourth parameter is used to indicate the number of downlink beams of the cell.

[0026] In combination with the sixteenth optional implementation of the first aspect, in the seventeenth optional implementation of the first aspect, the third cell is the cell with the largest number of corresponding downlink beams among the at least one cell.

[0027] This method increases the number of downlink beams used as the basis for selection in the cell reselection process for cells supporting coverage enhancement, and stipulates that the UE reselects to the cell with the largest number of downlink beams. Therefore, this is conducive to the terminal device to reselect to the cell supporting coverage enhancement as much as possible, so as to improve the communication quality of the terminal device. This implementation method does not need to add a second parameter to the cell supporting coverage enhancement, but adds an adjustment value to the number of downlink beams of the cell supporting coverage enhancement. It can be seen that the impact of coverage enhancement on cell reselection should be considered, and there can be multiple implementation methods, which are relatively flexible.

[0028] In combination with the first aspect or any one of the first optional implementation manners of the first aspect to the fourth optional implementation manner of the first aspect, in an eighteenth optional implementation manner of the first aspect, the method further includes: determining a measurement value of a third candidate cell when none of the first candidate cells satisfies the first condition; and reselecting a third cell with the largest measurement value among the third candidate cells. Determining the measurement value of the third candidate cell includes one or more of the following:

[0029] The measurement value of the first type of cells included in the third candidate cells is determined according to the value of the first parameter obtained by the terminal device measuring the first type of cells, the first type of cells includes one or more cells, and the first type of cells are cells that do not support coverage enhancement or reduced capability terminal equipment;

[0030] The measurement value of the second type of cells included in the third candidate cells is determined according to the value of the first parameter obtained by the terminal device measuring the second type of cells and the value of the fifth parameter of the second type of cells, the second type of cells includes one or more cells, the second type of cells are cells that do not support coverage enhancement but support reduced capability terminal devices, and the fifth parameter is used to indicate whether reduced capability terminal devices are supported;

[0031] The measurement value of the third type of cell included in the third candidate cell is determined according to the value of the first parameter obtained by the terminal device measuring the third type of cell and the value of the second parameter of the third type of cell, the third type of cell includes one or more cells, and the third type of cell is a cell that supports coverage enhancement but does not support reduced capability terminal equipment; or,

[0032] The measurement value of the fourth type of cell included in the third candidate cell is determined according to the value of the first parameter obtained by the terminal device measuring the fourth type of cell, the value of the fifth parameter of the fourth type of cell, and the value of the second parameter of the fourth type of cell. The fourth type of cell includes one or more cells, and the fourth type of cell is a cell that supports coverage enhancement and supports reduced capability terminal equipment. The fifth parameter is used to indicate whether the reduced capability terminal equipment is supported. If none of the first candidate cells meet the first condition, the terminal device can determine the measurement value of the first type of cell. Or, if none of the first candidate cells meet the first condition, and none of the second candidate cells meet the second condition, the terminal device can continue to select in the third candidate cell. Among them, the terminal device selects in the third candidate cell, and there can be multiple selection methods, one of which is provided here. The terminal device can determine the measurement value of the third candidate cell according to the support of the cell for the reduced capability terminal equipment and / or the support for coverage enhancement, so that the terminal device selects the third cell according to the finally determined measurement value, which can make the terminal device try to reselect to the cell that supports both the reduced capability terminal equipment and the coverage enhancement, so as to improve the communication quality of the terminal device.

[0033] In combination with the first aspect or any of the first optional implementation manners of the first aspect to the eighteenth optional implementation manner of the first aspect, in the nineteenth optional implementation manner of the first aspect, the method further includes: receiving a first message from a serving cell, the first message being used to indicate whether an adjacent cell of the serving cell supports a reduced capability terminal device and / or supports coverage enhancement. In an embodiment of the present application, the serving cell may indicate the situation of a neighboring cell, for example, indicating whether a neighboring cell supports a reduced capability terminal device, so that when the reduced capability terminal device performs cell reselection, it is possible to select a neighboring cell to minimize the probability of selecting a cell that does not support the reduced capability terminal device. For example, the serving cell may also indicate whether a neighboring cell supports coverage enhancement, so that whether it is a reduced capability terminal device or an ordinary terminal device, when performing cell reselection, it is possible to know in advance the support of the neighboring cell for coverage enhancement, for example, the reduced capability terminal device may try to reselect to a cell that supports coverage enhancement to improve the communication quality of the reduced capability terminal device.

[0034] In combination with the nineteenth optional implementation manner of the first aspect, in the twentieth optional implementation manner of the first aspect, the first message indicates whether the neighboring cell supports a reduced capability terminal device, including: the first message includes first indication information, and the first indication information is used to indicate that the neighboring cell supports a reduced capability terminal device or does not support a reduced capability terminal device; or, when the first message includes the first indication information, it indicates that the neighboring cell supports a reduced capability terminal device, and when the first message does not include the first indication information, it indicates that the neighboring cell does not support a reduced capability terminal device; or, when the first message includes a value of a fifth parameter of the neighboring cell, it indicates that the neighboring cell supports a reduced capability terminal device, and when the first message does not include the value of the fifth parameter of the neighboring cell, it indicates that the neighboring cell does not support a reduced capability terminal device, and the fifth parameter is used to indicate whether a reduced capability terminal device is supported; or, when the value of the fifth parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports a reduced capability terminal device, and when the value of the fifth parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support a reduced capability terminal device, and the fifth parameter is used to indicate whether a reduced capability terminal device is supported.

[0035] In combination with the nineteenth optional implementation manner of the first aspect, in a twenty-first optional implementation manner of the first aspect, the first message indicating whether the neighboring cell supports a reduced capability terminal device includes one or more of the following:

[0036] In a case where the first message indicates that the neighboring cell supports coverage enhancement, indicating that the neighboring cell supports reduced capability terminal equipment, and in a case where the first message indicates that the neighboring cell does not support coverage enhancement, indicating that the neighboring cell does not support reduced capability terminal equipment;

[0037] In a case where the first message indicates that the neighboring cell has configured random access resources for the reduced capability terminal device, indicating that the neighboring cell supports reduced capability terminal devices, and in a case where the first cell indicates that the neighboring cell has not configured random access resources for the reduced capability terminal device, indicating that the neighboring cell does not support reduced capability terminal devices; or,

[0038] When the first message indicates that the neighboring cell has configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell supports the reduced capability terminal device; when the first message indicates that the neighboring cell has not configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell does not support the reduced capability terminal device.

[0039] The first message indicates whether the neighboring cell supports the reduced capability terminal device, and there may be multiple indication methods, such as implicit indication or explicit indication, which is more flexible. The indication methods are not limited to the ones listed above, and other indication methods are also included in the protection scope of the embodiments of the present application.

[0040] In combination with the nineteenth optional implementation manner of the first aspect, the twentieth optional implementation manner of the first aspect, or the twenty-first optional implementation manner of the first aspect, in a twenty-second optional implementation manner of the first aspect, the first message indicates whether the neighboring cell supports coverage enhancement, including one or more of the following:

[0041] In a case where the first message includes the value of the second parameter of the neighboring cell, indicating that the neighboring cell supports coverage enhancement; in a case where the first message does not include the value of the second parameter of the neighboring cell, indicating that the neighboring cell does not support coverage enhancement;

[0042] When the value of the second parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports coverage enhancement; when the value of the second parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support coverage enhancement;

[0043] The first message includes second indication information, where the second indication information is used to indicate whether the neighboring cell supports coverage enhancement or does not support coverage enhancement; or,

[0044] In case that the first message includes the second indication information, it indicates that the neighboring cell supports coverage enhancement; in case that the first message does not include the second indication information, it indicates that the neighboring cell does not support coverage enhancement.

[0045] The first message indicates whether the neighboring cell supports coverage enhancement, and there may be multiple indication methods, such as implicit indication or explicit indication, which is more flexible. The indication methods are not limited to the ones listed above, and other indication methods are also included in the protection scope of the embodiments of the present application.

[0046] In a second aspect, another cell reselection method is provided, which can be executed by a network device, or by a chip system or other functional module, and the chip system or functional module can implement the function of the network device. Exemplarily, the network device is an access network device, such as a base station. The method includes: determining whether a neighboring cell has a first capability, the first capability including supporting reduced capability terminal devices and / or supporting coverage enhancement; sending a first message in a serving cell of the terminal device, the first message being used to indicate whether the neighboring cell has the first capability, and whether the neighboring cell has the first capability is used for the terminal device to perform cell reselection.

[0047] In combination with the second aspect, in a first optional implementation of the second aspect, the first message indicates whether the neighboring cell supports a reduced capability terminal device, including: the first message includes first indication information, and the first indication information is used to indicate that the neighboring cell supports a reduced capability terminal device or does not support a reduced capability terminal device; or, when the first message includes the first indication information, it indicates that the neighboring cell supports a reduced capability terminal device, and when the first message does not include the first indication information, it indicates that the neighboring cell does not support a reduced capability terminal device; or, when the first message includes a value of a fifth parameter of the neighboring cell, it indicates that the neighboring cell supports a reduced capability terminal device, and when the first message does not include the value of the fifth parameter of the neighboring cell, it indicates that the neighboring cell does not support a reduced capability terminal device, and the fifth parameter is used to indicate whether a reduced capability terminal device is supported; or, when the value of the fifth parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports a reduced capability terminal device, and when the value of the fifth parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support a reduced capability terminal device, and the fifth parameter is used to indicate whether a reduced capability terminal device is supported.

[0048] In combination with the second aspect, in a second optional implementation manner of the second aspect, the first message indicating whether the neighboring cell supports a reduced capability terminal device includes one or more of the following:

[0049] In a case where the first message indicates that the neighboring cell supports coverage enhancement, indicating that the neighboring cell supports reduced capability terminal equipment, and in a case where the first message indicates that the neighboring cell does not support coverage enhancement, indicating that the neighboring cell does not support reduced capability terminal equipment;

[0050] In a case where the first message indicates that the neighboring cell has configured random access resources for the reduced capability terminal device, indicating that the neighboring cell supports reduced capability terminal devices, and in a case where the first cell indicates that the neighboring cell has not configured random access resources for the reduced capability terminal device, indicating that the neighboring cell does not support reduced capability terminal devices; or,

[0051] When the first message indicates that the neighboring cell has configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell supports the reduced capability terminal device; when the first message indicates that the neighboring cell has not configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell does not support the reduced capability terminal device.

[0052] In combination with the second aspect or the first optional implementation manner of the second aspect or the second optional implementation manner of the second aspect, in a third optional implementation manner of the second aspect, the first message indicates whether the neighboring cell supports coverage enhancement, including one or more of the following:

[0053] In a case where the first message includes a value of the second parameter of the neighboring cell, indicating that the neighboring cell supports coverage enhancement; in a case where the first message does not include a value of the second parameter of the neighboring cell, indicating that the neighboring cell does not support coverage enhancement, and the second parameter is used to indicate a gain of coverage enhancement of the neighboring cell;

[0054] When the value of the second parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports coverage enhancement; when the value of the second parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support coverage enhancement, and the second parameter is used to indicate a gain of coverage enhancement of the neighboring cell;

[0055] The first message includes second indication information, where the second indication information is used to indicate whether the neighboring cell supports coverage enhancement or does not support coverage enhancement; or,

[0056] In case that the first message includes the second indication information, it indicates that the neighboring cell supports coverage enhancement; in case that the first message does not include the second indication information, it indicates that the neighboring cell does not support coverage enhancement.

[0057] Regarding the technical effects brought about by the second aspect or various optional implementations of the second aspect, reference may be made to the introduction to the technical effects of the first aspect or corresponding implementations.

[0058] In a third aspect, a communication device is provided. The communication device may be the terminal device described in any one of the first to second aspects. The communication device has the functions of the terminal device. The terminal device is, for example, a base station, or a baseband device in a base station. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it may be referred to as a sending unit (sometimes also referred to as a sending module), and when the transceiver unit implements the receiving function, it may be referred to as a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit may be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit may be different functional modules, and the transceiver unit is a general term for these functional modules.

[0059] The processing unit is used to determine whether there is a cell in the first candidate cell that meets the first condition when performing cell reselection, and the first candidate cell includes one or more cells;

[0060] The processing unit is further configured to reselect to the first cell if a first cell among the first candidate cells meets the first condition;

[0061] The first cell meeting the first condition includes:

[0062] The first cell satisfies that a value of a first parameter within a first time period is greater than a first value, wherein the first value is related to a second parameter of the first cell, and the second parameter is used to indicate a coverage enhancement gain of a cell.

[0063] In an optional implementation, the communication device also includes a storage unit, and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, so that the communication device can perform the functions of the terminal device described in any one of the first to second aspects above.

[0064] In a fourth aspect, a communication device is provided. The communication device may be the network device described in any one of the first to second aspects. The communication device has the functions of the above network device. The network device is, for example, a base station, or a baseband device in a base station. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The implementation of the transceiver unit can refer to the introduction of the third aspect.

[0065] The processing unit is configured to determine whether the neighboring cell has a first capability, wherein the first capability includes supporting reduced capability terminal equipment and / or supporting coverage enhancement;

[0066] The transceiver unit (or, the sending unit) is used to send a first message in a service cell of a terminal device, wherein the first message is used to indicate whether the neighboring cell has the first capability, and whether the neighboring cell has the first capability is used for the terminal device to perform cell reselection.

[0067] In an optional implementation, the communication device also includes a storage unit, and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, so that the communication device can perform the function of the network device described in any one of the first to second aspects above.

[0068] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store a computer program or instruction, and when the computer-readable storage medium is executed, the method executed by the terminal device or the network device in the above aspects is implemented.

[0069] According to a sixth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the methods described in the above aspects to be implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 is a schematic diagram of the coverage of redcap UE;

[0071] Figure 2 A schematic diagram showing that a redcap UE cannot re-enter a cell supporting coverage enhancement;

[0072] Figure 3 Another schematic diagram of a redcap UE being unable to re-enter a cell supporting coverage enhancement;

[0073] Figure 4 A schematic diagram of an application scenario of an embodiment of the present application;

[0074] Figure 5 A flowchart of a cell reselection method provided in an embodiment of the present application;

[0075] Figure 6 A schematic block diagram of a communication device provided in an embodiment of the present application;

[0076] Figure 7 A schematic block diagram of a terminal device provided in an embodiment of the present application;

[0077] Figure 8 A schematic block diagram of a network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0078] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0079] Below, some terms or concepts in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0080] In the embodiment of the present application, the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device built into the above device (for example, a communication module, a modem, or a chip system, etc.). The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: cellular communication, device-to-device communication (device-to-device, D2D), vehicle to everything (vehicle to everything, V2X), machine-to-machine / machine-type communication (machine-to-machine / machine-type communications, M2M / MTC), Internet of Things (Internet of Things, IoT), virtual reality (virtual reality, VR), augmented reality (augmented reality, AR), industrial control (industrial control), self-driving, remote medical, smart grid (smart grid), smart furniture, smart office, smart wear, smart transportation, smart city (smart city), drones, robots and other scenarios of terminal devices. The terminal device may sometimes be referred to as user equipment (UE), terminal, access station, UE station, remote station, wireless communication device, or user device, etc. For ease of description, the terminal device is described by taking UE as an example in the embodiments of the present application.

[0081] For example, one type of UE that the embodiments of the present application focus on is redcap UE. It is called redcap UE because compared with the existing ordinary UE (or legacy UE), redcapUE devices usually only support lower bandwidth, such as 20MHz, and support fewer transmit and receive antennas, such as only supporting 1T1R or 1T2R. According to the research content of the existing subject, redcap UE includes three types of low-capability UE: wearable products, video surveillance equipment and industrial sensor equipment.

[0082] The network device in the embodiment of the present application includes, for example, an access network device and / or a core network device. The access network device is a device with a wireless transceiver function, which is used to communicate with the terminal device. The access network device includes but is not limited to the base station (BTS, Node B, eNodeB / eNB, or gNodeB / gNB) in the above-mentioned communication system, a transmission reception point (TRP), a base station of the subsequent evolution of the third generation partnership project (3GPP), an access node in the wireless fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul node, etc. The base station can be: a macro base station, a micro base station, a micro-micro base station, a small station, a relay station, etc. Multiple base stations can support the same access technology mentioned above, or they can support the networks of different access technologies mentioned above. The base station may include one or more co-station or non-co-station transmission reception points. The network device may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The network device can also be a server, a wearable device, or a vehicle-mounted device. For example, the network device in the vehicle to everything (V2X) technology can be a road side unit (RSU). The following describes the access network device taking the base station as an example. The base station can communicate with the terminal device, or it can communicate with the terminal device through a relay station. The terminal device can communicate with multiple base stations in different access technologies. The core network device is used to implement functions such as mobility management, data processing, session management, policy and billing. The names of the devices that implement the core network functions in systems with different access technologies may be different, and the embodiments of the present application do not limit this. Taking the 5G system as an example, the core network device includes: access and mobility management function (AMF), session management function (SMF), policy control function (PCF) or user plane function (UPF), etc.

[0083] In the embodiment of the present application, the communication device for realizing the function of the network device may be a network device, or may be a device capable of supporting the network device to realize the function, such as a chip system, which may be installed in the network device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for realizing the function of the network device as an example that the network device is used as the device.

[0084] Coverage enhancement technology, such as downlink coverage enhancement technology, mainly includes multiple input multiple output (MIMO), repeated transmission, or power control to improve the coverage of UE, so that UE with weaker coverage (such as redcap UE) can also receive data normally like legacy UE (such as 4R UE).

[0085] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0086] The ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority or importance of multiple objects. For example, the first threshold and the second threshold can be the same threshold or different thresholds, and this name does not indicate the difference in the values, corresponding parameters, priority or importance of the two thresholds. In addition, the numbering of the steps in the various embodiments introduced in this application is only to distinguish different steps, and is not used to limit the order of the steps. For example, step S501 may occur before step S502, or may occur after S502, or may occur at the same time as S502.

[0087] Since the frequency of new radio (NR) base stations is higher than that of long term evolution (LTE) base stations, if the site originally used to set up LTE base stations is used to set up NR base stations, coverage will be reduced. Legacy UEs are generally 4R, so the coverage of NR base stations on legacy UEs can be compensated to a certain extent through the multiple antennas of legacy UEs. However, it is now possible to support redcap UEs, and redcap UEs are, for example, 1R UEs. In this case, the coverage of NR base stations on redcap UEs is obviously not as good as the coverage of legacy UEs. The range in which redcap UEs can correctly receive data is smaller than the range in which legacy UEs can correctly receive data, which will cause redcap UEs to have coverage gaps between cells, or the coverage gaps of redcap UEs are larger than the coverage gaps of legacy UEs.

[0088] For example, the legacy UE is a 4R UE and the redcap UE is a 1R UE. The reasons why the coverage of the 4R UE is better than that of the 1R UE are as follows: the standard defines that the RSRP value measured by the 4R UE is the maximum value among the values ​​measured by the four antennas, while the 1R UE has only one antenna, so the RSRP value measured by the 4R UE may be greater than the RSRP value measured by the 1R UE. If the 1R UE wants to have the same RSRP value as the 4R UE, the 1R UE needs to be closer to the base station. In addition, even if the RSRP values ​​measured by the 1R UE and the 4R UE are the same, because the 4R UE has more antennas and can perform maximum ratio combining, the overall signal noise ratio (SNR) of the 4R UE will still be greater than that of the 1R UE. Therefore, the bit error rate (BER) of the 4R UE is lower than that of the 1R UE, and the range of normal data transmission is larger than that of the 1R UE. If the 1R UE wants to have the same BER as the 4R UE, the RSRP value measured by the 1R UE needs to be larger, that is, the 1R UE needs to be closer to the base station. Figure 1 As shown, 4R UE( Figure 1 The coverage of UE1 in the figure (i.e., the range in which 4R UE can transmit data normally) is shown as the larger dotted circle, and the coverage of 1R UE ( Figure 1 The coverage of UE2 in the figure is shown by the smaller solid circle. Figure 1 The area between the two solid circles in (or outside the two solid circles) is the coverage gap of the base station for 1R UE. Figure 1 Because the two dotted circles have overlapping areas, Figure 1For the 4R UE in the example, it can be considered that there is no coverage gap or that the coverage gap is small. The coverage gap of the base station to the UE can be understood as when the UE is in the coverage gap, the UE is not in the coverage range of any base station. Figure 1 The 1R UE in the figure is currently in the coverage gap, and the 1R UE may not be able to normally receive data from the serving cell. For the 4R UE, the dotted circle is the coverage range of the 4R UE, and the 4R UE can receive data from the serving cell at its current location.

[0089] The coverage gap of redcap UE may cause some problems in cell reselection, as described below with examples.

[0090] Question 1: If Figure 2 As shown, for example, redcap UE( Figure 2 The UE in the redcap UE reselects the cell according to the RSRP threshold of the legacy UE. However, the RSRP value measured by the redcap UE may be too small to meet the RSRP threshold of the legacy UE. Therefore, the redcap UE cannot reselect to the neighboring cell (NC), which will be referred to as the neighboring cell below. Because the redcap UE is in the coverage gap (i.e., between or outside the two solid circles), that is, the redcap UE is not within the range where it can receive data normally (i.e., as shown by the solid circle), the redcap UE cannot receive data normally from the serving cell, resulting in the redcap UE being unable to work properly. In particular, if the serving cell does not support coverage enhancement but the neighboring cell supports coverage enhancement, reselecting to the neighboring cell is a better option for the redcap UE, but because of the RSRP relationship, the redcap UE cannot reselect.

[0091] Question 2: If Figure 3 As shown, for example, the redcap UE performs cell reselection according to the RSRP threshold of the legacy UE. If neighboring cell 1 and neighboring cell 2 have the same priority, the redcap UE will sort the RSRP values ​​of the measured cells according to the value size, and reselect the cell with the largest RSRP value. For example, neighboring cell 2 supports coverage enhancement, and neighboring cell 1 does not support coverage enhancement. It is ideal for the redcap UE to reselect to neighboring cell 2. However, the RSRP value measured by the redcap UE for neighboring cell 1 may be greater than the RSRP value measured for neighboring cell 2. Therefore, the redcap UE may reselect to neighboring cell 1 but cannot reselect to neighboring cell 2.

[0092] According to the above problems, it can be seen that when a redcap UE performs cell reselection, the probability of reselecting a cell that supports coverage enhancement is relatively small.

[0093] In view of this, a technical solution of an embodiment of the present application is provided. In an embodiment of the present application, when the UE performs cell reselection, to determine whether it can reselect to the first cell, it can determine whether the first cell satisfies the first condition. If the first condition is satisfied, it can reselect to the first cell. The first condition involves a first value, and the first value is, for example, related to the quality threshold of the neighboring cell during cell reselection. In addition, the first value is also related to the gain of coverage enhancement of the first cell, that is, a relationship is established between the judgment condition of the UE and the support of the cell for coverage enhancement, and the impact of coverage enhancement on cell reselection is taken into account. In this way, the UE can be made to reselect to a cell that supports coverage enhancement as easily as possible, thereby improving the communication quality of the UE.

[0094] For reference Figure 4 , is a schematic diagram of an application scenario of an embodiment of the present application. Figure 4 In the example, the UE can communicate with network device 1, and cell 1 provided by network device 1 is the serving cell of the UE. Cell 2 provided by network device 2 is the neighboring cell of the UE. When the UE performs cell reselection, cell 2 can be used as a candidate cell. Figure 4 In the example, cell 1 and cell 2 are cells provided by different network devices, or cell 1 and cell 2 may be cells provided by the same network device, that is, Figure 4 Just an example.

[0095] Figure 4 The network device in the example is an access network device, and the access network device is, for example, a base station. Among them, the access network device corresponds to different devices in different systems. For example, in a 4G system, it can correspond to an eNB, and in a 5G system, it corresponds to an access network device in 5G, such as a gNB. Of course, the technical solution provided in the embodiment of the present application can also be applied to future mobile communication systems, so Figure 4 The access network device in the embodiment of the present application may also correspond to a network device in a future mobile communication system. In the embodiment of the present application, the access network device is a base station as an example. In fact, referring to the introduction in the foregoing text, the access network device may also be a device such as an RSU.

[0096] The following describes the method provided by the embodiment of the present application in conjunction with the accompanying drawings. In the accompanying drawings corresponding to the various embodiments of the present application, all optional steps are indicated by dotted lines. The UE described in the various embodiments of the present application is, for example, a redcap UE, or it can also be a legacy UE. The technical solutions described in the various embodiments of the present application can be applied to Figure 4 For example, the UE described in each embodiment of the present application is Figure 4 The UE in the network architecture shown; the serving cell of the UE described in each embodiment of the present application is, for example, Figure 4Cell 1 in the network architecture shown; the first cell, the second cell or the third cell described in each embodiment of the present application is, for example, Figure 4 Cell 2 in the network architecture shown; the network devices described in various embodiments of the present application are, for example, Figure 4 Network device 1 in the network architecture shown.

[0097] This application embodiment provides a cell reselection method, see Figure 5 , which is a flow chart of the method.

[0098] S501. The network device sends a first message in the service cell of the UE, and correspondingly, the UE receives the first message from the network device. The first message may indicate whether the neighboring cell supports redcap UE, and the UE can clearly determine whether the neighboring cell supports redcap UE based on the first message; or, the first message may indicate whether the neighboring cell supports coverage enhancement, and the UE can clearly determine whether the neighboring cell supports coverage enhancement based on the first message; or, the first message may indicate whether the neighboring cell supports redcap UE and whether it supports coverage enhancement, and the UE can clearly determine whether the neighboring cell supports redcap UE and whether it supports coverage enhancement based on the first message. Among them, there may be one or more neighboring cells of the service cell, and the first message may indicate one neighboring cell or multiple neighboring cells. If multiple neighboring cells are indicated, it may indicate whether each neighboring cell supports redcap UE and / or supports coverage enhancement. Because the indication method of the first message for each neighboring cell may be similar, the embodiment of the present application is introduced by taking the first message indicating one neighboring cell as an example.

[0099] The first message is, for example, a system message, such as a system information block (SIB), or the first message may also be other messages, such as other broadcast messages or unicast messages.

[0100] The first message indicates whether the neighboring cell supports redcap UE. There may be multiple indication modes, which are described below with examples.

[0101] 1. Display indication mode.

[0102] The first message may include first indication information, and the first indication information may indicate that the neighboring cell supports redcap UE, or indicates that the neighboring cell does not support redcap UE. For example, the first indication information occupies 1 bit, and if the value of the bit is "1", it indicates that the neighboring cell supports redcap UE; if the value of the bit is "0", it indicates that the neighboring cell does not support redcap UE.

[0103] Alternatively, if the first message includes the first indication information, it indicates that the neighboring cell supports redcap UE, and if the first message does not include the first indication information, it indicates that the neighboring cell does not support redcap UE. The first indication information may occupy one or more bits.

[0104] If the first message is to indicate whether multiple neighboring cells support redcap UE, the first message may be indicated by multiple first indication information, and one first indication information indicates one neighboring cell. For example, multiple first indication information may be implemented by a bitmap, and the number of bits included in the bitmap is equal to the number of neighboring cells that need to be indicated, and one bit of the bitmap is used to indicate one neighboring cell. Alternatively, one first indication information among multiple first indication information may include an identifier of the neighboring cell indicated by the first indication information (such as the ID or number of the neighboring cell, etc.), and information indicating whether the neighboring cell supports redcap UE. Alternatively, multiple first indication information may also have other implementation methods, which will not be elaborated.

[0105] There is another possibility that the first message does not indicate whether the neighboring cell supports redcap UE through the first indication information, but indicates whether the neighboring cell supports redcap UE through the fifth parameter. The fifth parameter can indicate whether the cell supports redcap UE. For example, the fifth parameter is represented as offset n,r , where n represents the cell identifier, such as the cell number or ID, and r represents redcap. For example, for a cell, if the cell does not support redcap, the offset of the cell n,r The value of is "0", and if the cell supports redcap, the offset of the cell n,r The value of is "1", which can be used to simply distinguish whether the cell supports redcap.

[0106] For example, if the first message includes the fifth parameter of the neighbor cell, it indicates that the neighbor cell supports redcap UE, or if the first message does not include the fifth parameter of the neighbor cell, it indicates that the neighbor cell does not support redcap UE.

[0107] For another example, if the value of the fifth parameter of the neighboring cell included in the first message is not the first set value, it indicates that the neighboring cell supports redcap UE, or, if the value of the fifth parameter of the neighboring cell included in the first message is the first set value, it indicates that the neighboring cell does not support redcap UE. The first set value is, for example, 0, or may be other values. The first set value is, for example, configured by a network device, or specified by a protocol, etc.

[0108] Whether the neighboring cell supports redcap UE is indicated by displaying an indication method, making the indication clearer.

[0109] Among them, if the first message indicates whether the neighboring area supports redcap UE through the first indication information, or indicates whether the neighboring area supports redcap UE through an implicit indication method, then it is equivalent to that the serving cell does not send the value of the fifth parameter of the neighboring area. In this case, it can be considered that the neighboring area also corresponds to the fifth parameter. For the cell that supports redcap UE, the value of the fifth parameter is the same, and the value is, for example, specified by the protocol or configured by the network device; for the cell that does not support coverage enhancement, the value of the fifth parameter is, for example, 0. If the UE needs to use the value of the fifth parameter of the neighboring area (for example, the value of the fifth parameter of the neighboring area is needed in the cell reselection process described later), the value of the fifth parameter of the neighboring area can be determined in the above manner. Alternatively, the above indication method can also be combined with application, for example, the first message can indicate whether the neighboring area supports redcap UE through the first indication information, or indicate whether the neighboring area supports redcap UE through an implicit indication method, wherein, if the neighboring area supports redcap UE, the first message can also include the value of the fifth parameter of the neighboring area. This method makes the content of the indication more comprehensive. If the first message does not indicate whether the neighboring cell supports redcap UE, the UE does not need to consider the fifth parameter of the cell during the cell reselection process.

[0110] 2. Implicit indication method.

[0111] The first message may implicitly indicate whether the neighboring cell supports redcap UE by including some other information.

[0112] For example, if the first message indicates that the neighboring cell supports coverage enhancement, it implicitly indicates that the neighboring cell supports redcap UE; if the first message indicates that the neighboring cell does not support coverage enhancement, it implicitly indicates that the neighboring cell does not support redcap UE.

[0113] For another example, if the first message indicates that the neighboring cell has configured random access channel (RACH) resources for redcap UE, it implicitly indicates that the neighboring cell supports redcap UE; if the first message indicates that the neighboring cell has not configured RACH resources for redcap UE, it implicitly indicates that the neighboring cell does not support redcap UE.

[0114] For another example, if the first message indicates that the neighboring cell has configured an initial uplink bandwidth part (initial uplink bandwidth part, initial UL BWP) for the redcap UE, it implicitly indicates that the neighboring cell supports redcap UE; if the first message indicates that the neighboring cell has not configured an initial UL BWP for the redcap UE, it implicitly indicates that the neighboring cell does not support redcap UE.

[0115] The above-mentioned indication methods can be applied separately, or any two or three of them can be applied in combination. For example, one combination method is that if the first message indicates that the neighboring cell has configured the initial UL BWP for the redcap UE, and indicates that the neighboring cell has configured the RACH resources for the redcap UE, then it implicitly indicates that the neighboring cell supports the redcap UE; if the first message indicates that the neighboring cell has not configured the initial UL BWP for the redcap UE and / or has not configured the RACH resources for the redcap UE, then it implicitly supports that the neighboring cell does not support the redcap UE.

[0116] By implicitly indicating whether the neighboring cell supports redcap UE, the indication can be completed without adding additional information in the first message, which can reduce signaling overhead and reduce the modification of the format of the first message, so that the technical solution of the embodiment of the present application can be better compatible with existing protocols.

[0117] The first message may also indicate whether the neighboring cell supports coverage enhancement. Similarly, there are multiple indication methods.

[0118] For example, one indication method is that the first message includes second indication information corresponding to the neighboring area, and the second indication information may indicate that the neighboring area supports coverage enhancement, or indicates that the neighboring area does not support coverage enhancement. For example, the second indication information occupies 1 bit, and if the value of the bit is "1", it indicates that the neighboring area indicated by the second indication information supports coverage enhancement, and if the value of the bit is "0", it indicates that the neighboring area indicated by the second indication information does not support coverage enhancement.

[0119] For another example, another indication method is that if the first message includes second indication information corresponding to the neighboring cell, it indicates that the neighboring cell supports coverage enhancement, and if the first message does not include the second indication information corresponding to the neighboring cell, it indicates that the neighboring cell does not support coverage enhancement.

[0120] The second indication information is used to indicate whether the neighboring cell supports coverage enhancement, and the indication method is relatively simple.

[0121] Alternatively, the first message may also indicate whether the neighboring cell supports coverage enhancement through the second parameter.

[0122] For example, one indication method is that if the first message includes the value of the second parameter of the neighboring cell, it indicates that the neighboring cell supports coverage enhancement, and if the first message does not include the value of the second parameter of the neighboring cell, it indicates that the neighboring cell does not support coverage enhancement.

[0123] For another example, another indication method is that if the value of the second parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports coverage enhancement, and if the value of the second parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support coverage enhancement. The second parameter is a parameter related to the gain of coverage enhancement of the neighboring cell. For example, the greater the gain of coverage enhancement of the neighboring cell, the greater the value of the second parameter of the neighboring cell. For example, when the neighboring cell does not support coverage enhancement, the value of the second parameter of the neighboring cell is 0. As the gain of coverage enhancement of the neighboring cell increases, the value of the second parameter of the neighboring cell also increases. The second parameter is, for example, represented as offset n , n can represent the identifier of the neighboring cell, such as the ID of the neighboring cell or the number of the neighboring cell.

[0124] Among them, if the first message indicates whether the neighboring area supports coverage enhancement through the second indication information, it is equivalent to that the serving cell does not send the value of the second parameter of the neighboring area. In this case, it can be considered that the neighboring area also corresponds to the second parameter. For the cell that supports coverage enhancement, the value of the second parameter is the same, and the value is, for example, specified by the protocol or configured by the network device; for the cell that does not support coverage enhancement, the value of the second parameter is, for example, 0. If the UE needs to use the value of the second parameter of the neighboring area (for example, the value of the second parameter of the neighboring area is needed in the cell reselection process described later), the value of the second parameter of the neighboring area can be determined in the above manner. Alternatively, the above indication method can also be applied in combination, for example, the first message can indicate whether the neighboring area supports coverage enhancement through the second indication information, wherein, if the neighboring area supports coverage enhancement, the first message can also include the value of the second parameter of the neighboring area. This method makes the content of the indication more comprehensive. If the first message does not indicate whether the neighboring area supports coverage enhancement, the UE does not need to consider the second parameter of the cell during the cell reselection process.

[0125] In an embodiment of the present application, the serving cell may indicate the situation of the neighboring cell, for example, whether the neighboring cell supports redcap UE, so that the redcap UE can make a choice of the neighboring cell when performing cell reselection, and minimize the probability of selecting a cell that does not support redcap UE. For example, the serving cell may also indicate whether the neighboring cell supports coverage enhancement, so that both the redcap UE and the legacy UE can know in advance the support of the neighboring cell for coverage enhancement when performing cell reselection, for example, the redcap UE can try to reselect to a cell that supports coverage enhancement to improve the communication quality of the redcap UE.

[0126] Optionally, the neighboring cell may also indicate whether the neighboring cell supports redcap UE and / or supports coverage enhancement by a similar method, for example, the neighboring cell may also send a message indicating whether the neighboring cell supports redcap UE and / or supports coverage enhancement. If this is the case, the UE is required to read the message of the neighboring cell.

[0127] The serving cell may not execute S501, so S501 is an optional step.

[0128] S502: When performing cell reselection, the UE determines whether a cell in the first candidate cell satisfies the first condition. When the UE resides in the serving cell for a time period greater than or equal to 1 second, the cell reselection can be performed. The candidate cells of the UE when performing cell reselection may include one or more cells, for example, the candidate cells may include at least one neighboring cell of the serving cell of the UE, and may also include the serving cell, that is, the serving cell may also be used as a candidate cell.

[0129] When the UE performs cell reselection, the candidate cells may have different situations. For example, the candidate cells may include one or more of the following cells: a cell with a high priority frequency, a cell with a low priority frequency, a cell with the same frequency as the serving cell, or a cell with a different frequency from the serving cell and the same priority as the serving cell. In the face of these cells, the UE can prioritize whether it can reselect to a cell with a high priority frequency. If it can reselect to a cell with a high priority frequency, the UE reselects to the cell with the high priority frequency and no longer determines whether it can reselect to other cells. If it cannot reselect to a cell with a high priority frequency, the UE can determine whether it can reselect to a cell with the same frequency as the serving cell, or determine whether it can reselect to a cell with a different frequency from the serving cell and the same priority as the serving cell. If both the cell with the same frequency as the serving cell and the cell with a different frequency from the serving cell and the same priority as the serving cell cannot be reselected, the UE can determine whether it can reselect to a cell with a low priority frequency. Alternatively, if it cannot reselect to a cell with a high priority frequency, the UE can determine whether it can reselect to a cell with a low priority frequency. If it is impossible to reselect a cell with a low priority frequency, the UE may determine whether it can reselect a cell with the same frequency as the serving cell, or determine whether it can reselect a cell with a different frequency from the serving cell and with the same priority as the serving cell.

[0130] Optionally, the first candidate cell, for example, includes cells with high priority frequencies among all candidate cells for cell reselection by the UE, but does not include other cells. For example, when the UE performs cell reselection, there are 10 candidate cells in total, 5 of which are cells with high priority frequencies, and the other 5 include one or more of cells with low priority frequencies, cells with the same frequency as the serving cell, or cells with different frequencies but the same priority as the serving cell. Then, the first candidate cell may refer to the 5 cells with high priority frequencies. Optionally, if the UE receives the first message, and the first message indicates whether the neighboring cell supports redcap UE, the first candidate cell may be a cell that supports redcap UE, that is, the UE can screen cells that support redcap UE as candidate cells for cell reselection. If the first message does not indicate whether the neighboring cell supports redcap UE, the first candidate cell may include cells that support redcap UE and / or cells that do not support redcap UE. Alternatively, even if the first message indicates whether the neighboring cell supports redcap UE, the first candidate cell may include cells supporting redcap UE and / or cells not supporting redcap UE, that is, the UE may not consider whether it supports redcap UE when determining the first candidate cell.

[0131] The first condition is used to determine whether a cell with a high priority frequency can be reselected. For example, if a cell is a cell with a high priority frequency, the UE determines whether it can reselect the cell based on the first condition. If the cell meets the first condition, the UE can reselect the cell, and if the cell does not meet the first condition, the UE cannot reselect the cell.

[0132] A cell satisfies the first condition, which may include: within a first time period, the value of the first parameter measured by the UE for the cell is greater than the first value, or the cell satisfies that the value of the first parameter within the first time period is greater than the first value. For example, within the first time period, the UE may perform one or more measurements on the cell, and each measurement can obtain the value of the first parameter. Then, a cell satisfies the first condition, which may mean that the value of the first parameter obtained by each measurement of part or all of the measurements performed by the UE on the cell within the first time period is greater than the first value. In the following text, all references to "first time period" are explained in a similar way. The first value is related to the value of the second parameter of the cell. Since the second parameter can indicate the cell's support for coverage enhancement, it can be considered that the first condition is related to whether the neighboring cell (or the first candidate cell) supports coverage enhancement. The first time period is, for example, Treselection RAT , or it may be other durations defined in the embodiments of the present application. The first parameter is, for example, reference signal receiving quality (RSRQ), or RSRP, or it may be other parameters. Among them, when the type of the first parameter is different, the first value may also be different accordingly. A cell satisfies the first condition, and there may be different implementation methods, which are introduced by example below.

[0133] 1. The first implementation method of the first condition.

[0134] In addition to being related to the value of the second parameter of the cell, the first value may also be related to the first threshold or the second threshold. For example, if the first parameter is RSRQ, the first value may also be related to the first threshold. If the first parameter is RSRP, the first value may also be related to the second threshold. The first threshold is the value threshold of the RSRQ of the cell during cell reselection. For example, the first threshold is Thresh X,HighQ , or may be other values ​​defined in the embodiment of the present application. The second threshold is the RSRP value threshold of the cell during cell reselection, for example, the second threshold is Thresh X,HighP, or may be other values ​​defined in the embodiments of the present application. For example, if the first value is related to the value of the second parameter of the cell and the first threshold, one implementation of the first value is that the first value is the difference between the first threshold and the value of the second parameter of the cell. If the first value is related to the value of the second parameter of the cell and the second threshold, one implementation of the first value is that, for example, the first value is the difference between the second threshold and the value of the second parameter of the cell.

[0135] For example, the RSRQ value obtained by the UE for the cell is represented as S qual , the RSRP value measured by the UE for the cell is represented as S rxlev , a cell satisfies the first condition, for example, the cell satisfies the following formula 1 or formula 2:

[0136] S qual >Thresh X,HighQ -offset n (In the first time period) (Formula 1)

[0137] S rxlev >Thresh X,HighP -offset n (In the first time period) (Formula 2)

[0138] If the first parameter is RSRQ, then S = Thresh X,HighQ -offset n , and if the first parameter is RSRP, then S = Thresh X,HighP -offset n , where S represents the first value. For simplicity, Thresh X,HighQ It can also be represented by Q or other characters. Thresh X,HighP It can also be represented by P or other characters.

[0139] offset n It is the value of the second parameter of the cell. If a cell satisfies formula 1 or formula 2, it is considered that the cell satisfies the first condition and the UE can reselect to the cell; if a cell does not satisfy both formula 1 and formula 2, it is considered that the cell does not satisfy the first condition and the UE cannot reselect to the cell. For example, for a neighboring cell of a serving cell, the greater the coverage enhancement gain of the neighboring cell, the greater the offset of the neighboring cell. n The larger the value of is, the larger the value of is. Then when the UE judges according to the above formula, it is equivalent to using the corresponding threshold minus a larger offset. n , so the S measured by the UE is qual or Srxlev It is possible that the above formula is satisfied, thereby enabling the UE to reselect the neighboring cell.

[0140] The first implementation of the first condition takes into account the impact of coverage enhancement on cell reselection and increases the offset. n To lower the RSRP threshold of the cell supporting coverage enhancement, making it easier for the UE to reselect to the cell supporting coverage enhancement.

[0141] 2. The second way to implement the first condition.

[0142] In the first implementation of the first condition, the coverage enhancement gain of the neighboring cell is taken into consideration. Then, during the cell reselection process of the UE, the serving cell may also be selected as a candidate cell, and the serving cell may also support coverage enhancement. If the serving cell supports coverage enhancement but the neighboring cell does not support coverage enhancement, it is actually more desirable for the UE to stay in the serving cell. For this purpose, a second implementation of the first condition is proposed, and a third parameter is introduced in the second implementation of the first condition. The third parameter is a parameter related to the coverage enhancement gain of the UE's serving cell. For example, the serving cell may indicate the value of the third parameter through a first message, or may indicate the value of the third parameter to the UE in other ways. In the second implementation of the first condition, the greater the coverage enhancement gain of the serving cell, the greater the value of the third parameter. For example, when the serving cell does not support coverage enhancement, the value of the third parameter of the serving cell is 0. As the coverage enhancement gain of the serving cell increases, the value of the third parameter of the serving cell increases. The third parameter is, for example, expressed as offset. s , s may represent an identifier of a serving cell, such as an ID of a serving cell or a number of a neighboring cell, or s may simply represent a serving cell. After the third parameter is introduced, the first condition may have a second implementation manner different from the aforementioned implementation manner.

[0143] In this implementation, the first value may be related to the second parameter of the neighboring cell and to the third parameter of the serving cell. In addition, if the first parameter is RSRQ, the first value may also be related to the first threshold, and if the first parameter is RSRP, the first value may also be related to the second threshold.

[0144] For example, the RSRQ value obtained by the UE for the cell is represented as S qual , the RSRP value measured by the UE for the cell is represented as S rxlev , a cell satisfies the first condition, for example, the cell satisfies the following formula 3 or formula 4:

[0145] S qual >Thresh X,HighQ +offset s-offset n (In the first time period) (Formula 3)

[0146] S rxlev >Thresh X,HighP +offset s -offset n (In the first time period) (Formula 4)

[0147] If the first parameter is RSRQ, then S = Thresh X,HighQ +offset s -offset n , and if the first parameter is RSRP, then S = Thresh X,HighP +offset s -offset n , where S represents the first value.

[0148] offset n This is the value of the second parameter of the cell, offset s It is the value of the third parameter of the serving cell. If a cell satisfies Formula 3 or Formula 4, it is considered that the cell satisfies the first condition and the UE can reselect to the cell; if a cell does not satisfy Formula 3 or Formula 4, it is considered that the cell does not satisfy the first condition and the UE cannot reselect to the cell. For example, for a neighboring cell of the serving cell, the greater the coverage enhancement gain of the neighboring cell, the greater the offset of the neighboring cell. n The larger the value of , the greater the coverage enhancement gain of the serving cell. s For example, if the neighboring cell supports coverage enhancement, but the serving cell does not, then the offset n The value of is larger, offset s If the value of is small, then when the UE judges according to the above formula, it is equivalent to using the corresponding threshold minus a larger offset. n In addition, although we need to add offset s , but offset s The value of is small, so the S measured by the UE is qual or S rxlev The above formula may be satisfied, so that the UE can reselect to the neighboring cell. For another example, if the neighboring cell does not support coverage enhancement, but the serving cell does, then offset n The value of is small, for example, 0, while offset sIf the value of is large, then when the UE judges according to the above formula, it is equivalent to using the corresponding threshold plus a larger offset. s In addition, although the offset must be subtracted n , but offset n The value of is small, so the S measured by the UE is qual or S rxlev It is possible that the above formula cannot be satisfied, and the UE will continue to stay in the serving cell.

[0149] The second implementation of the first condition considers the impact of coverage enhancement of neighboring cells on cell reselection, as well as the impact of coverage enhancement of the serving cell on cell reselection, and minimizes the problem that the UE will still reselect to a neighboring cell with a high priority frequency that does not support coverage enhancement when the serving cell supports coverage enhancement. This method can make the UE stay in the cell that supports coverage enhancement as much as possible by considering whether the serving cell supports coverage enhancement.

[0150] 3. The third way to implement the first condition.

[0151] In addition to being related to the value of the second parameter of the cell, the first value may also be related to the value of the fifth parameter of the cell. In addition, the first value may also be related to the first threshold or the second threshold. For example, if the first message indicates whether the neighboring area supports redcap UE through the first indication information, then if the neighboring area supports redcap UE, the UE can determine that the value of the fifth parameter of the neighboring area is the second set value, and if the neighboring area does not support redcap UE, the UE can determine that the value of the fifth parameter of the neighboring area is the first set value. The second set value is, for example, configured by a network device, or is specified by a protocol, etc. The second set value is, for example, 1, or it may be other values, and the first set value has been introduced in the previous text. For another example, if the first message indicates whether the neighboring area supports redcap UE through the fifth parameter, the UE can obtain the value of the fifth parameter of the neighboring area based on the first message.

[0152] For example, if the first parameter is RSRQ, the first value may be related to the value of the second parameter of the cell, the value of the fifth parameter of the cell, and the first threshold; and if the first parameter is RSRP, the first value may be related to the value of the second parameter of the cell, the value of the fifth parameter of the cell, and the second threshold.

[0153] For example, the RSRQ value obtained by the UE for the cell is represented as S qual , the RSRP value measured by the UE for the cell is represented as S rxlev , the fifth parameter is represented as offset n,r, a cell satisfies the first condition, for example, the cell satisfies the following formula 1 or formula 2:

[0154] S qual >Thresh X,HighQ -offset n,r -offset n (In the first time period) (Formula 5)

[0155] S rxlev >Thresh X,HighP -offset n,r -offset n (In the first time period) (Formula 6)

[0156] If the first parameter is RSRQ, then S = Thresh X,HighQ -offset n,r -offset n , and if the first parameter is RSRP, then S = Thresh X,HighP -offset n,r -offset n , where S represents the first value.

[0157] offset n is the value of the second parameter of the cell, offset n,r is the value of the fifth parameter of the cell. If a cell satisfies Formula 5 or Formula 6, it is considered that the cell satisfies the first condition and the UE can reselect to the cell; if a cell does not satisfy Formula 5 or Formula 6, it is considered that the cell does not satisfy the first condition and the UE cannot reselect to the cell. For example, for a neighboring cell of a serving cell, the greater the coverage enhancement gain of the neighboring cell, the greater the offset of the neighboring cell. n The larger the value of , and if the neighboring cell supports redcap UE, the offset of the neighboring cell n,r The value of is larger (relative to the value when the neighboring cell does not support redcap UE). Then when the UE judges according to the above formula, it is equivalent to using the corresponding threshold minus the larger value, so the S measured by the UE is qual or S rxlev It is possible that the above formula is satisfied, thereby enabling the UE to reselect the neighboring cell.

[0158] The third implementation of the first condition takes into account both the impact of coverage enhancement on cell reselection and the impact of whether redcap UE is supported on cell reselection. By increasing the offset n and offset n,rTo lower the RSRP threshold of UEs supporting coverage enhancement and redcap, making it easier for UEs to reselect cells that support coverage enhancement and redcap.

[0159] 2. The fourth way to implement the first condition.

[0160] A fourth implementation manner of the first condition is to introduce a third parameter on the basis of the third implementation manner of the first condition, where the third parameter is a parameter related to the coverage enhancement gain of the UE's serving cell.

[0161] In this implementation, the first value may be related to the second parameter of the neighboring cell, to the fifth parameter of the neighboring cell, and to the third parameter of the serving cell. In addition, if the first parameter is RSRQ, the first value may also be related to the first threshold, and if the first parameter is RSRP, the first value may also be related to the second threshold.

[0162] For example, the RSRQ value obtained by the UE for the cell is represented as S qual , the RSRP value measured by the UE for the cell is represented as S rxlev , the fifth parameter is represented as offset n,r , a cell satisfies the first condition, for example, the cell satisfies the following formula 3 or formula 4:

[0163] S qual >Thresh X,HighQ +offset s -offset n,r -offset n (In the first duration) (Formula 7)

[0164] S rxlev >Thresh X,HighP +offset s -offset n,r -offset n (In the first duration) (Formula 8)

[0165] If the first parameter is RSRQ, then S = Thresh X,HighQ +offset s -offset n,r -offset n , and if the first parameter is RSRP, then S = Thresh X,HighP +offset s -offset n,r -offset n , where S represents the first value.

[0166] offset n is the value of the second parameter of the cell, offset n,r Is the value of the fifth parameter of the cell, offset s is the value of the third parameter of the serving cell. If a cell satisfies Formula 7 or Formula 8, it is considered that the cell satisfies the first condition and the UE can reselect to the cell; if a cell does not satisfy Formula 7 or Formula 8, it is considered that the cell does not satisfy the first condition and the UE cannot reselect to the cell. For example, for a neighboring cell of the serving cell, the greater the coverage enhancement gain of the neighboring cell, the greater the offset of the neighboring cell. n The larger the value of , the greater the coverage enhancement gain of the serving cell. s For example, if the neighboring cell supports coverage enhancement and supports redcap UE, but the serving cell does not support coverage enhancement, then the offset n The value of is larger, offset s The value of is small, offset n,r It may also be greater than 0. In this case, when the UE judges according to the above formula, it is equivalent to using the corresponding threshold minus a larger offset. n , and also subtract the offset n,r , and added offset s , although offset is also added s , but offset s The value of is small, so the S measured by the UE is qual or S rxlev The above formula may be satisfied, so that the UE can reselect to the neighboring cell. For another example, if the neighboring cell does not support coverage enhancement or redcap UE, but the serving cell supports coverage enhancement, then offset n The value of is small, for example, 0, offset n,r The value of is also small, for example, 0, offset s If the value of is large, then when the UE judges according to the above formula, it is equivalent to using the corresponding threshold plus a larger offset. s , and also subtract the offset n,r and offset n , although the offset is subtracted n,r and offset n , but offset n,r and offset n The values ​​of S are all small, and the S qual or Srxlev It is possible that the above formula cannot be satisfied, so the UE will continue to stay in the serving cell.

[0167] The fourth implementation method of the first condition takes into account the impact of coverage enhancement of neighboring cells on cell reselection, as well as the impact of coverage enhancement of the serving cell on cell reselection, and minimizes the problem that when the serving cell supports coverage enhancement, the UE will still reselect to a neighboring cell with a high priority frequency that does not support coverage enhancement. This method can make the UE reside in a cell that supports coverage enhancement as much as possible by considering whether the serving cell supports coverage enhancement. In addition, this implementation method also takes into account the impact of whether the cell supports redcap UE on cell reselection. Through this implementation method, the UE can be made to reside in a cell that supports redcap UE and coverage enhancement as much as possible.

[0168] If the third implementation or the fourth implementation of the first condition is adopted, it is not necessary to require the first candidate cell to support redcap UE, because the influence of whether redcap UE is supported on cell reselection can be reflected through the judgment process of the first condition. If the first implementation or the second implementation of the first condition is adopted, the first candidate cell can be a cell that supports redcap UE, or there is no restriction on whether the first candidate cell supports redcap UE.

[0169] If the first message indicates whether the neighboring cell supports coverage enhancement and whether the neighboring cell supports redcap UE, any one of the first implementation method, the second implementation method, the third implementation method or the fourth implementation method of the first condition may be considered. Alternatively, if the first message indicates whether the neighboring cell supports coverage enhancement but does not indicate whether the neighboring cell supports redcap UE, the first implementation method or the second implementation method of the first condition may be considered. Alternatively, if the first message does not indicate whether the neighboring cell supports coverage enhancement but indicates whether the neighboring cell supports redcap UE, the first candidate cell determined by the UE may be a cell that supports redcap UE, and the UE may select a cell from the first candidate cell in the existing manner.

[0170] S503: When a first cell among the first candidate cells satisfies a first condition, the UE reselects to the first cell.

[0171] For example, the first cell is one of the first candidate cells, and the UE may judge the first cell according to one implementation of the first condition. If the first cell satisfies the first condition, the UE may reselect the first cell.

[0172] If none of the first candidate cells satisfy the first condition, the UE may then select from cells with a lower priority frequency, or may select from cells with the same frequency or the same priority (as the UE's serving cell), and the UE will execute the subsequent steps accordingly. The subsequent steps are parallel schemes with S503, and the UE will choose to execute the corresponding scheme based on whether the candidate cells satisfy the first condition. Therefore, S504 to S511 to be introduced later are all considered optional steps. Among them, S504 to S505 to be introduced below are ways for the UE to select from cells with a low priority frequency band, and S506 to S511 are ways for the UE to select from cells with the same frequency or the same priority. S504 to S505, S506 to S507, S508 to S509, and S510 to S511 are four parallel schemes ( Figure 5 The large dotted boxes in the figure represent these solutions. Figure 5 In the example, S502 and S503 are also placed in a dotted box as a scheme. If none of the candidate cells meet the first condition, the UE can execute one of the four parallel schemes. Alternatively, S506-S507, S508-S509, and S510-S511 are three parallel schemes. If none of the first candidate cells meet the first condition, the UE executes S504-S505, and if none of the second candidate cells meet the second condition to be described below, the UE executes one of the three parallel schemes.

[0173] S504: The UE determines whether there is a cell in the second candidate cells that meets the second condition.

[0174] If none of the first candidate cells meet the first condition, the UE can then determine whether any of the second candidate cells meets the second condition. Alternatively, if none of the first candidate cells meet the first condition and the third candidate cells cannot be reselected, the UE can then determine whether any of the second candidate cells meets the second condition. The third candidate cells will be described later.

[0175] Optionally, the second candidate cell includes, for example, cells with low priority frequencies among all candidate cells for cell reselection by the UE, but does not include other cells. For example, when the UE performs cell reselection, there are 10 candidate cells in total, 5 of which are cells with high priority frequencies, 2 of the other 5 are cells with low priority frequencies, and the remaining 3 include cells with the same frequency as the serving cell and / or cells with different frequencies but the same priority as the serving cell. Then, the second candidate cell may refer to 2 cells with low priority frequencies. The second candidate cell includes one or more cells. Optionally, if the UE receives the first message and the first message indicates whether the neighboring cell supports redcap UE, the second candidate cell may be a cell that supports redcap UE, that is, the UE can screen cells that support redcap UE as candidate cells for cell reselection. If the first message does not indicate whether the neighboring cell supports redcap UE, the second candidate cell may include cells that support redcap UE and / or cells that do not support redcap UE. Alternatively, even if the first message indicates whether the neighboring cell supports redcap UE, the second candidate cell may include cells supporting redcap UE and / or cells not supporting redcap UE, that is, the UE may not consider whether it supports redcap UE when determining the second candidate cell.

[0176] The second condition is used to determine whether a cell with a low priority frequency can be reselected. For example, if a cell is a cell with a low priority frequency, the UE determines whether it can reselect the cell based on the second condition. If the cell satisfies the second condition, the UE can reselect the cell, and if the cell does not satisfy the second condition, the UE cannot reselect the cell.

[0177] A cell satisfies the second condition, which may include: the value of the first parameter measured by the UE for the serving cell within the first time period is less than the second value, and the value of the first parameter measured by the UE for the cell within the first time period is greater than the third value. In other words, a cell satisfies the second condition, which may include: the serving cell of the UE satisfies that the value of the first parameter within the first time period is less than the second value, and the cell satisfies that the value of the first parameter within the first time period is greater than the third value. The second value is related to the third parameter of the serving cell, and the third value is related to the second parameter of the cell. Since the second parameter can indicate the support of the cell to be reselected for coverage enhancement, and the third parameter can indicate the support of the serving cell for coverage enhancement, it can be considered that the second condition is related to whether the serving cell and the neighboring cell (or the second candidate cell) support coverage enhancement.

[0178] In addition to being related to the value of the third parameter of the serving cell, the second value may also be related to the third threshold or the fourth threshold. For example, if the first parameter is RSRQ, the second value is also related to the third threshold. If the first parameter is RSRP, the second value is also related to the fourth threshold. The third threshold is the value threshold of the RSRQ of the serving cell during cell reselection. For example, the third threshold is Thresh Serving,LowQ , or may be other values ​​defined in the embodiments of the present application. The fourth threshold is the value threshold of the RSRP of the serving cell during cell reselection, for example, the fourth threshold is Thresh Serving,LowP , or it may be other values ​​defined in the embodiments of the present application. For example, if the second value is related to the value of the fourth parameter of the serving cell and the third threshold, one implementation of the second value is that the second value is the sum of the third threshold and the value of the third parameter of the serving cell. For another example, if the second value is related to the value of the fourth parameter of the serving cell and the fourth threshold, one implementation of the second value is, for example, the second value is the sum of the fourth threshold and the value of the third parameter of the serving cell.

[0179] In addition to being related to the value of the second parameter of the cell, the third value may also be related to the fifth threshold or the sixth threshold. For example, if the first parameter is RSRQ, the third value is also related to the fifth threshold. If the first parameter is RSRP, the third value is also related to the sixth threshold. The fifth threshold is the value threshold of the RSRQ of the cell during cell reselection. For example, the fifth threshold is Thresh X,LowQ , or may be other values ​​defined in the embodiments of the present application. The sixth threshold is the RSRP value threshold of the cell during cell reselection, for example, the sixth threshold is Thresh X,LowP , or may be other values ​​defined in the embodiments of the present application. For example, if the third value is related to the value of the second parameter of the cell by a fifth threshold, then one implementation of the third value is that the third value is the difference between the fifth threshold and the value of the second parameter of the cell. For another example, if the third value is related to the value of the second parameter of the cell by a sixth threshold, then one implementation of the third value is that the third value is the difference between the sixth threshold and the value of the second parameter of the cell.

[0180] For example, the RSRQ value obtained by the UE for the cell is represented as S qual , the RSRP value measured by the UE for the cell is represented as S rxlev , a cell satisfies the second condition, for example, the cell satisfies the following formula 9 and formula 10, or satisfies formula 11 and formula 12:

[0181] S qual <Thresh Serving,LowQ +offset s(In the first time period) (Formula 9)

[0182] S qual >Thresh X,LowQ -offset n (In the first time period) (Formula 10)

[0183] S rxlev <Thresh Serving,LowP +offset s (In the first time period) (Formula 11)

[0184] S rxlev >Thresh X,LowP -offset n (In the first time period) (Formula 12)

[0185] If a cell satisfies Formula 9 and Formula 10, it is considered that the cell satisfies the second condition, and the UE can reselect to the cell. Alternatively, if a cell satisfies Formula 11 and Formula 12, it is also considered that the cell satisfies the second condition, and the UE can reselect to the cell. If a cell does not satisfy Formula 9 and / or Formula 10, nor does it satisfy Formula 11 and / or Formula 12, it is considered that the cell does not satisfy the second condition, and the UE cannot reselect to the cell.

[0186] In the process of determining the second condition, for example, for a neighboring cell of the serving cell, the greater the coverage enhancement gain of the neighboring cell, the greater the offset of the neighboring cell. n The larger the value of , the greater the coverage enhancement gain of the serving cell. s For example, if the neighboring cell supports coverage enhancement, but the serving cell does not, then the offset n The value of is larger, offset s The value of is larger. For example, when the UE makes judgment according to the above formula 5 and formula 6, the formula 6 is equivalent to using the corresponding threshold minus a larger offset. n In formula 5, it is equivalent to using the corresponding threshold plus a larger offset s , so the S measured by the UE is qual It is possible that the above formulas 5 and 6 are satisfied, so that the UE can reselect to the neighboring cell. For another example, if the neighboring cell does not support coverage enhancement, but the serving cell does, then offset n The value of is small, for example, 0, while offset sThe value of is also small, for example, it is also 0, which means that the UE still makes judgments according to the original threshold. Since the original threshold may be large, the S measured by the UE qual or S rxlev It is possible that the above formula cannot be satisfied, so the UE will continue to stay in the serving cell.

[0187] This implementation of the second condition takes into account the impact of coverage enhancement on cell reselection. The serving cell adds an offset that is opposite to the change rule of coverage enhancement gain. s To make it more difficult for UE to leave the service cell supporting coverage enhancement, the neighboring cell subtracts an offset proportional to the change law of the coverage enhancement gain. n To make it easier for the UE to reselect to a neighboring cell that supports coverage enhancement. In short, this method can make the UE stay in the cell that supports coverage enhancement as much as possible to improve the communication quality of the UE.

[0188] Optionally, if the first message indicates whether the neighboring cell supports redcap UE, the second condition may be changed accordingly. For example, the offset in formula 9 and / or formula 11 may be changed to s Replace with (offset s +offset n,r ), and the offset in Formula 10 and / or Formula 12 can be n Replace with (offset n +offset n,r ), offset n,r Indicates the value of the fifth parameter of the cell. In this way, both the impact of coverage enhancement on cell reselection and the impact of whether redcap UE is supported on cell reselection are taken into account, making it easier for UE to reselect to a cell that supports coverage enhancement and redcap UE. If the second condition is implemented in this way, it is not necessary to require the second candidate cell to support redcap UE, because the impact of whether redcap UE is supported on cell reselection can be reflected through the judgment process of the second condition.

[0189] If the first message indicates whether the neighboring cell supports coverage enhancement, the UE can select a cell according to the second condition regardless of whether the first message indicates support for redcap UE. Alternatively, if the first message does not indicate whether the neighboring cell supports coverage enhancement but indicates whether the neighboring cell supports redcap UE, the second candidate cell determined by the UE can be a cell that supports redcap UE, and the UE can select a cell from the second candidate cells in the existing manner.

[0190] S505: When the second cell in the second candidate cells meets the second condition, the UE returns to the second cell.

[0191] For example, the second cell is one of the second candidate cells, and the UE may judge the second cell according to the second condition. If the second cell satisfies the second condition, the UE may reselect the second cell, and the cell reselection process ends.

[0192] If none of the second candidate cells meet the first condition, the UE may select from cells with the same frequency or the same priority (as the UE's serving cell), and the UE will execute subsequent steps accordingly. Alternatively, if none of the second candidate cells meet the first condition, the UE may also end the cell reselection process.

[0193] S506. The UE determines a measurement value of a first-category cell in a third candidate cell.

[0194] If none of the first candidate cells satisfies the first condition, the UE may determine the measurement value of the first type of cell. Alternatively, if none of the first candidate cells satisfies the first condition and none of the second candidate cells satisfies the second condition, the UE may determine the measurement value of the first type of cell in the third candidate cell.

[0195] Optionally, the third candidate cell includes, for example, cells with the same frequency as the serving cell and / or cells with different frequencies but the same priority as the serving cell among all candidate cells for cell reselection by the UE, but does not include other cells. For example, when the UE performs cell reselection, there are 10 candidate cells in total, 5 of which are cells with high priority frequencies, 2 of the other 5 are cells with low priority frequencies, and the remaining 3 include cells with the same frequency as the serving cell and / or cells with different frequencies but the same priority as the serving cell, then the third candidate cell may refer to the remaining 3 cells.

[0196] Alternatively, if the UE receives the first message, and the first message indicates whether the neighboring cell supports redcap UE, the third candidate cell may be a cell that supports redcap UE, that is, the UE may screen cells that support redcap UE as candidate cells for cell reselection. If the first message does not indicate whether the neighboring cell supports redcap UE, the third candidate cell may include cells that support redcap UE and / or cells that do not support redcap UE. Alternatively, even if the first message indicates whether the neighboring cell supports redcap UE, the third candidate cell may include cells that support redcap UE and / or cells that do not support redcap UE, that is, the UE may not consider whether redcap UE is supported when determining the third candidate cell.

[0197] The third candidate cell includes one or more cells, and the third candidate cell may include a first type of cell and a second type of cell. For example, the number of cells included in the first type of cell is greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell. For example, the first message indicates whether the neighboring cell supports coverage enhancement, so that the UE can determine the first type of cell from the third candidate cell, and the first type of cell, for example, includes a cell that supports coverage enhancement. The measurement value of a cell in the first type of cell can be determined according to the value of the second parameter measured by the UE for the cell and the value of the third parameter of the cell. Among them, "measurement value" is just a name, and the feature can also have other names, such as "ranking value". It should be understood that although it is called "measurement value", the value is not necessarily directly measured. For example, the measurement value of a cell can be directly measured by the UE, or it can be obtained by the UE after the measured value is transformed accordingly. For example, the measurement value of a cell in the first type of cell can be equal to the sum of the value of the first parameter measured by the UE for the cell and the value of the second parameter of the cell, for example, the first parameter is RSRP or RSRQ. For example, R represents the measurement value of a cell in the first type of cell, R′ represents the value of the first parameter measured by the UE for the cell, and offset n represents the value of the second parameter of the cell, then the measured value of the cell can satisfy the following relationship:

[0198] R=R′+offset n (Formula 13)

[0199] The third candidate cell may also include a second type of cell, where the second type of cell is a cell that does not support coverage enhancement, for example, the number of cells included in the second type of cell is greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell. The UE also needs to determine the measurement value of the second type of cell, for example, the measurement value of a cell in the second type of cell can be determined based on the value of the first parameter measured by the UE for the cell. For example, R represents the measurement value of a cell in the second type of cell, and R′ represents the value of the first parameter measured by the UE for the cell, then the measurement value of the cell can satisfy R=R′.

[0200] S507. The UE reselects to a third cell among the third candidate cells according to the measurement value of the third candidate cell.

[0201] The UE determines the measurement values ​​of the first type of cell and / or the second type of cell. If the network does not configure the best cell range (range to best cell), the UE may sort the cells included in the third candidate cell according to the relationship from large to small in terms of the measurement values, and reselect to the cell with the largest measurement value. For example, if the third cell is the cell with the largest measurement value, the UE reselects to the third cell.

[0202] If the network configures the best cell range, the UE can sort the cells included in the third candidate cell according to the relationship from large to small in the measured value, and select the third type of cell from them. The third type of cell includes one or more cells. The third type of cell is a cell whose measured value is within the first interval. The first interval can indicate the best cell range, or the first interval can also be other interval ranges. Each cell has a corresponding number of downlink beams. The UE can reselect the cell with the largest number of downlink beams in the third type of cells. For example, the third cell is the cell with the largest number of downlink beams in the third type of cells, and the UE reselects to the third cell. If there are multiple cells with the largest number of downlink beams in the third type of cells, the UE can reselect the cell with the largest measured value among the multiple cells. For example, the maximum number of downlink beams corresponding to the third type of cells is 5, and there are 2 cells corresponding to 5 downlink beams, so the UE can reselect the cell with the largest measured value among the two cells. For example, the two cells include the third cell and the fourth cell, and the measured value of the third cell is greater than that of the fourth cell, then the UE can reselect to the third cell.

[0203] Alternatively, after the UE selects the third type of cell, it can reselect the cell with the largest number of downlink beams whose communication quality is greater than the first quality threshold in the third type of cell. Each cell has a corresponding downlink beam, and each downlink beam has its own communication quality. The communication quality of some downlink beams may be poor, for example, the communication quality is less than or equal to the first quality threshold, and the communication quality of some downlink beams may be good, for example, the communication quality is greater than the first quality threshold, then it is equivalent to that the UE can select a cell with a large number of downlink beams with good communication quality. The first quality threshold is, for example, configured by a network device, or determined by the UE itself, or can also be specified by a protocol. For example, the third cell in the third type of cell has a total of 5 downlink beams, and the communication quality of 3 of the downlink beams is greater than the first quality threshold, and the number of downlink beams with communication quality greater than the first quality threshold owned by other cells in the third type of cell is less than 3, then the UE reselects to the third cell. If there are multiple cells in the third type of cell with the same number of downlink beams greater than the first quality threshold, and they are all the largest, then the UE can reselect to the cell with the largest measurement value among these multiple cells. For example, the third cell in the third category of cells has a total of 5 downlink beams, and the communication quality of 3 of them is greater than the first quality threshold. The fourth cell has a total of 4 downlink beams, and the communication quality of 3 of them is greater than the first quality threshold. The number of downlink beams with communication quality greater than the first quality threshold owned by other cells in the third category of cells is less than 3. Then the UE can choose between the third cell and the fourth cell. For example, if the measurement value of the third cell is greater than the measurement value of the fourth cell, the UE reselects to the third cell.

[0204] It can be seen that the UE adds an additional offset for the cell that supports coverage enhancement. n , and the greater the gain of the neighboring cell's coverage enhancement, the greater the offset of the neighboring cell. n The larger the value of is, the larger the measurement value of the cell supporting coverage enhancement is, so that the UE can more easily reselect the cell supporting coverage enhancement, thereby improving the communication quality of the UE.

[0205] If the first message indicates whether the neighboring cell supports coverage enhancement, the UE can select a cell according to the method described in S506 and S507 regardless of whether the first message indicates the support for redcap UE. Alternatively, if the first message does not indicate whether the neighboring cell supports coverage enhancement but indicates whether the neighboring cell supports redcap UE, the third candidate cell determined by the UE can be a cell that supports redcap UE, and the UE can select a cell from the third candidate cells in the existing manner.

[0206] S508. The UE determines a first part of cells from the third candidate cells, where the first part of cells includes at least one cell.

[0207] If none of the first candidate cells meets the first condition, the UE may determine the measurement value of the first type of cells. Alternatively, if none of the first candidate cells meets the first condition and none of the second candidate cells meets the second condition, the UE may determine the first part of cells from the third candidate cells.

[0208] As a first optional implementation of the first part of cells, the first part of cells are cells whose measurement values ​​are greater than the seventh threshold. This implementation is applicable to the case where the network has not configured the best cell range. For example, the UE selects cells whose measurement values ​​are greater than the seventh threshold from the third candidate cells, and these cells constitute the first part of cells. This implementation does not require adding an offset to the cells supporting coverage enhancement. n Instead, a seventh threshold is set for the first parameter (such as RSRP or RSRQ), and reselection is performed in cells exceeding the seventh threshold. Compared with adding an offset to a cell supporting coverage enhancement, n This implementation is simpler than the previous one.

[0209] As a second optional implementation of the first part of cells, the measurement values ​​of the first part of cells are all within the first interval, and the number of downlink beams corresponding to the first part of cells is greater than the ninth threshold; or, the measurement values ​​of the first part of cells are all within the first interval, and the number of downlink beams corresponding to the first part of cells whose communication quality is greater than the first quality threshold is greater than the eighth threshold. The first interval, for example, indicates the best cell range. This implementation method is applicable to the case where the network is configured with the best cell range. The eighth threshold is, for example, determined by the UE itself, or configured by the network device, or it can also be specified by the protocol. The ninth threshold is, for example, determined by the UE itself, or configured by the network device, or it can also be specified by the protocol. This implementation method does not need to add an offset to the cell that supports coverage enhancement. n Instead, an eighth threshold (or a ninth threshold) is set for the first parameter (such as RSRP or RSRQ), and reselection is performed in cells exceeding the eighth threshold (or the ninth threshold). Compared with adding an offset to a cell supporting coverage enhancement, n This implementation is simpler than the previous one.

[0210] In the above two implementations of the first part of cells, the measurement value of a cell in the third candidate cells can be determined according to the value of the first parameter measured by the UE for the cell. For example, R represents the measurement value of a cell in the third candidate cells, and R′ represents the value of the first parameter measured by the UE for the cell, then the measurement value of the cell can satisfy R=R′.

[0211] As a third optional implementation of the first part of cells, the measurement values ​​of the first part of cells are all located in the first interval. This implementation is applicable to the case where the network is configured with the best cell range.

[0212] Selecting the first part of cells is equivalent to setting a selection threshold. If no cell in the third candidate cells can meet the requirement of being selected into the first part of cells, that is, no cell can be one of the first part of cells, then it indicates that there may be no cell with better conditions. Then, the UE may not perform cell reselection to reduce the power consumption caused by cell reselection and the probability of reselecting to a worse cell.

[0213] S509: The UE reselects to a third cell in the first part of cells.

[0214] If the first optional implementation method of the first part of cells is adopted, then after determining the first part of cells, the UE can select a cell in the first part of cells that supports coverage enhancement and has the largest measurement value, and reselect to the cell. For example, the first part of cells includes the third cell, the fourth cell, and the fifth cell. The third cell and the fifth cell support coverage enhancement, and the fourth cell does not support coverage enhancement. The measurement values ​​of these three cells are in the following relationship: the measurement value of the fourth cell> the measurement value of the third cell> the measurement value of the fifth cell. Then the UE can reselect to the third cell. In other words, when performing cell reselection, the UE not only considers the measurement value, but also considers the support for coverage enhancement, and tries to reselect to a cell that supports coverage enhancement.

[0215] If the second optional implementation method of the first part of cells is adopted, then after determining the first part of cells, the UE can reselect to the cell in the first part of cells that supports coverage enhancement and has the largest number of corresponding downlink beams. For example, in the first part of cells, the third cell and the fourth cell both support coverage enhancement, and the other cells do not support coverage enhancement, the number of downlink beams corresponding to the third cell is 5, and the number of downlink beams corresponding to the fourth cell is 4, then the UE can reselect to the third cell.

[0216] Alternatively, if the second optional implementation method of the first part of cells is adopted, then after determining the first part of cells, the UE can reselect to the cell with the largest number of downlink beams in the first part of cells that supports coverage enhancement and whose corresponding communication quality is greater than the first quality threshold. For example, in the first part of cells, the third cell and the fourth cell both support coverage enhancement, and other cells do not support coverage enhancement, the number of downlink beams corresponding to the third cell is 5, of which the communication quality of 4 downlink beams is greater than the first quality threshold, and the number of downlink beams corresponding to the fourth cell is 4, of which the communication quality of 3 downlink beams is greater than the first quality threshold, then the UE can reselect to the third cell.

[0217] If the third optional implementation of the first part of cells is adopted, then after determining the first part of cells, the UE can determine the adjustment value of the number of downlink beams of the cells supporting coverage enhancement in the first part of cells. For example, the adjustment value of the number of downlink beams of a cell supporting coverage enhancement in the first part of cells can be re-determined according to the number of downlink beams of the cell and the sixth parameter, the sixth parameter being represented as offset, for example. n,b, where n represents the identification of the cell, such as the number or ID of the cell, and b represents the downlink beam. The sixth parameter can be set according to the number of downlink beams of the cell. For different cells, the value of the sixth parameter can be different, or the sixth parameter can be the same for all cells supporting coverage enhancement, that is, the value of the sixth parameter is a fixed value. The sixth parameter is set by the UE, or configured by the network device, or can also be specified by the protocol, etc. There may be cells that do not support coverage enhancement in the first part of the cells. For these cells, there is no need to determine the adjustment value of the number of downlink beams. After determining the adjustment value of the number of downlink beams of the cells that support coverage enhancement in the first part of the cells, the UE can reselect the cell with the largest number of downlink beams in the first part of the cells, wherein for the cell with the adjustment value of the number of downlink beams (such as the cell that supports coverage enhancement), the UE considers the adjustment value of the number of downlink beams of the cell when selecting, instead of the number of downlink beams of the cell, and for the cell that does not have the adjustment value of the number of downlink beams (such as the cell that does not support coverage enhancement), the UE considers the number of downlink beams of the cell when selecting. For example, the first part of cells includes the third cell, the fourth cell and the fifth cell, wherein the third cell and the fourth cell have adjustment values ​​for the number of downlink beams, and the fifth cell does not have an adjustment value for the number of downlink beams. For example, the adjustment value for the number of downlink beams of the third cell is 5, the adjustment value for the number of downlink beams of the fourth cell is 4, and the number of downlink beams of the fifth cell is 4, then the UE reselects to the third cell. This method increases the number of downlink beams used as the basis for selection of cells supporting coverage enhancement during the cell reselection process, while stipulating that the UE reselects to the cell with the largest number of downlink beams. Therefore, this is conducive to the UE reselecting to the cell supporting coverage enhancement as much as possible to improve the communication quality of the UE. This implementation method does not need to add an offset to the cell supporting coverage enhancement. n Instead, an offset is added to the number of downlink beams in the cell that supports coverage enhancement. n,b ,It can be seen that the impact of coverage enhancement on ,cell reselection should be considered and there are multiple ,flexible implementation methods.

[0218] If the first message indicates whether the neighboring cell supports coverage enhancement, the UE can select a cell according to the method described in S508 and S509 regardless of whether the first message indicates the support for redcap UE. Alternatively, if the first message does not indicate whether the neighboring cell supports coverage enhancement but indicates whether the neighboring cell supports redcap UE, the third candidate cell determined by the UE can be a cell that supports redcap UE, and the UE can select a cell from the third candidate cell in the existing manner.

[0219] S510. The UE determines a measurement value of a third candidate cell.

[0220] If none of the first candidate cells satisfy the first condition, the UE may determine the measurement value of the first type of cell. Alternatively, if none of the first candidate cells satisfy the first condition, and none of the second candidate cells satisfy the second condition, the UE may determine the measurement value of the third candidate cell. The third candidate cell may include multiple types of cells, for example, the third candidate cell may include one or more of the following cells: first type of cells, second type of cells, third type of cells, or fourth type of cells. The number of cells included in the first type of cells may be greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell; the number of cells included in the second type of cells may be greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell; the number of cells included in the third type of cells may be greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell; the number of cells included in the fourth type of cells may be greater than or equal to 0, and less than or equal to the total number of cells included in the third candidate cell. Among them, the first type of cell is a cell that does not support redcap UE and does not support coverage enhancement, the second type of cell is a cell that supports redcap UE and does not support coverage enhancement, the third type of cell is a cell that does not support redcap UE and supports coverage enhancement, and the fourth type of cell is a cell that supports redcap UE and supports coverage enhancement. It can be seen that the first type of cell described in S510 is a different concept from the first type of cell described in S506 and S507; the second type of cell described in S510 is a different concept from the second type of cell described in S506 and S507; the third type of cell described in S510 is a different concept from the third type of cell described in S506 and S507. For these types of cells, the UE can determine the measurement value in a corresponding manner.

[0221] For example, the measurement value of a cell in the first type of cells may be determined according to the value of a first parameter (such as RSRP or RSRQ) obtained by the UE measuring the cell. For example, R represents the measurement value of a cell in the first type of cells, and R′ represents the value of a second parameter obtained by the UE measuring the cell, then the measurement value of the cell may satisfy R=R′.

[0222] The measurement value of a cell in the second type of cell can be determined according to the value of the first parameter measured by the UE for the cell and the value of the fifth parameter of the cell, and the fifth parameter can indicate whether the cell supports redcap UE. For example, the fifth parameter is represented as offset n,r , where n represents the cell identifier, such as the cell number or ID, and r represents redcap. For example, for a cell, if the cell does not support redcap, the offset of the cell n,r The value of is "0", and if the cell supports redcap, the offset of the celln,r The value of is "1", which can be used to simply distinguish whether the cell supports redcap. For example, R represents the measurement value of a cell in the second type of cell, and R' represents the value of the first parameter measured by the UE for the cell, then the measurement value of the cell can satisfy the following relationship:

[0223] R=R′+offset n,r (Formula 14)

[0224] The measurement value of a cell in the third type of cell may be determined according to the value of the first parameter measured by the UE for the cell and the value of the second parameter of the cell. For example, R represents the measurement value of a cell in the third type of cell, and R′ represents the value of the first parameter measured by the UE for the cell, then the measurement value of the cell may satisfy the following relationship:

[0225] R=R′+offset n (Formula 15)

[0226] The measurement value of a cell in the fourth category of cells may be determined according to the value of the first parameter measured by the UE for the cell, the value of the fifth parameter of the cell, and the value of the second parameter of the cell. For example, R represents the measurement value of a cell in the fourth category of cells, and R′ represents the value of the first parameter measured by the UE for the cell, then the measurement value of the cell may satisfy the following relationship:

[0227] R=R′+offset n +offset n,r (Formula 16)

[0228] Among them, if the first message indicates whether the neighboring cell supports redcap UE and indicates whether the neighboring cell supports coverage enhancement, then the way in which the UE determines the value of the fifth parameter of a cell can be referred to the previous description. If the first message indicates whether the neighboring cell supports coverage enhancement but does not indicate whether the neighboring cell supports redcap UE, the fifth parameter of the cell may not be considered when determining the measurement values ​​of various cells in the third candidate cell. For example, formula 14 can be changed to R=R′, and formula 16 can be changed to R=R′+offset n If this is the case, it is equivalent to dividing the third candidate cells into two categories, one of which supports coverage enhancement and the other does not support coverage enhancement. For the cells that do not support coverage enhancement, Formula 14 is used, and for the cells that support coverage enhancement, Formula 16 is used.

[0229] Alternatively, the first message may also indicate whether the neighboring cell supports redcap UE without indicating whether the neighboring cell supports coverage enhancement. If this is the case, the second parameter of the cell may not be considered when determining the measurement values ​​of various types of cells in the third candidate cell. For example, formula 15 may be changed to R=R′, and formula 16 may be changed to R=R′+offset n,r If this is the case, it is equivalent to dividing the third candidate cell into two categories, one of which supports redcap UE and the other does not support redcap UE. For the cell that does not support redcap UE, formula 15 is used, and for the cell that supports redcap UE, formula 16 is used.

[0230] S511. The UE reselects the third cell with the largest measurement value among the third candidate cells.

[0231] After the UE determines the measurement values ​​of the cells included in the third candidate cell in the manner described in S510, the UE may sort the measurement values ​​corresponding to the third candidate cells in descending order of the measurement values, and reselect the cell with the largest measurement value. For example, if the third cell is the cell with the largest measurement value, the UE reselects the third cell.

[0232] The scheme of S510 to S511 does not need to select a part of cells from the third candidate cells according to corresponding conditions, thus saving the process of selecting cells. In addition, the scheme also sets a fifth parameter for cells supporting redcap UEs, and uses the fifth parameter and the second parameter to respectively represent the support for redcap UEs and the gain of coverage enhancement. In the reselection of cells with the same frequency or the same priority, the UE can be reselected to the cell that supports both redcap UEs and coverage enhancement as much as possible, so as to improve the communication quality of the UE.

[0233] The embodiment of the present application establishes a relationship between the judgment condition when the UE performs cell reselection and the support of the cell for coverage enhancement, taking into account the impact of coverage enhancement on cell reselection. In this way, the UE can be made to reselect to a cell that supports coverage enhancement more easily, thereby improving the communication quality of the UE. Optionally, the judgment condition when the UE performs cell reselection can also be related to the support of the cell for redcap UE, so that the UE can be reselected to a cell that supports coverage enhancement and supports redcap UE as much as possible, reducing the probability of the UE reselecting to a cell that does not support redcap UE.

[0234] Figure 6 A schematic diagram of the structure of a communication device 600 provided in an embodiment of the present application is given. The communication device 600 may be Figure 5The terminal device described in the embodiment shown is used to implement the method performed by the terminal device in the above method embodiment. Alternatively, the communication device 600 may also be Figure 5 The network device described in the embodiment shown is used to implement the method corresponding to the network device in the above method embodiment. For specific functions, please refer to the description in the above method embodiment.

[0235] The communication device 600 includes one or more processors 601. The processor 601 may also be referred to as a processing unit, which may implement certain control functions. The processor 601 may be a general-purpose processor or a dedicated processor, etc. For example, it may include: a baseband processor, a central processing unit, an application processor, a modem processor, a graphics processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, and / or a neural network processor, etc. The baseband processor may be used to process communication protocols and communication data. The central processing unit may be used to control the communication device 600, execute software programs and / or process data. Different processors may be independent devices, or they may be integrated into one or more processors, for example, integrated into one or more dedicated integrated circuits.

[0236] Optionally, the communication device 600 includes one or more memories 602 for storing instructions 604, and the instructions 604 can be executed on the processor so that the communication device 600 performs the method described in the above method embodiment. Optionally, data can also be stored in the memory 602. The processor and the memory can be set separately or integrated together.

[0237] Optionally, the communication device 600 may include instructions 603 (sometimes also referred to as codes or programs), and the instructions 603 may be executed on the processor so that the communication device 600 executes the method described in the above embodiment. The processor 601 may store data.

[0238] Optionally, the communication device 600 may further include a transceiver 605 and an antenna 606. The transceiver 605 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, a transceiver, an input / output interface, etc., and is used to implement the transceiver function of the communication device 600 through the antenna 606.

[0239] Optionally, the communication device 600 may also include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, a speaker, a microphone, an input / output module, a sensor module, a motor, a camera, or a display screen, etc. It is understood that in some embodiments, the communication device 600 may include more or fewer components, or some components may be integrated, or some components may be separated. These components may be implemented in hardware, software, or a combination of software and hardware.

[0240] The processor 601 and the transceiver 605 described in the embodiment of the present application may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFID), a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), or an electronic device, etc. The communication device described herein may be an independent device (e.g., an independent integrated circuit, a mobile phone, etc.), or may be a part of a larger device (e.g., a module that can be embedded in other devices). For details, please refer to the aforementioned description of the terminal device and the network device, which will not be repeated here.

[0241] The present application embodiment provides a terminal device, which can be used in the above embodiments (for the convenience of description, referred to as UE). The terminal device includes a Figure 5 The corresponding means, units and / or circuits of the terminal device functions described in the illustrated embodiments are as follows: For example, the terminal device includes a transceiver module to support the terminal device to implement the transceiver function, and a processing module to support the terminal device to process the signal.

[0242] Figure 7 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application is given.

[0243] The terminal device 700 can be applied to Figure 4 For ease of illustration, Figure 7 Only the main components of the terminal device 700 are shown. Figure 7As shown, the terminal device 700 includes a processor, a memory, a control circuit, an antenna, and an input-output device. The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device 700, execute the software program, and process the data of the software program. The memory is mainly used to store the software program and data. The control circuit is mainly used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. The input-output device, such as a touch screen, a display screen, a microphone, a keyboard, etc., is mainly used to receive data input by the user and output data to the user.

[0244] Taking the terminal device 700 as a mobile phone as an example, when the terminal device 700 is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the control circuit. The control circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal outward through the antenna in the form of electromagnetic waves. When data is sent to the terminal device 700, the control circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

[0245] Those skilled in the art will appreciate that for ease of description, Figure 7 Only one memory and processor are shown. In some embodiments, the terminal device 700 may include multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiments of the present invention.

[0246] As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process the communication protocol and communication data, and the central processing unit is mainly used to control the entire terminal device 700, execute software programs, and process software program data. Figure 7The processor in the embodiment integrates the functions of the baseband processor and the central processing unit. It can be understood by those skilled in the art that the baseband processor and the central processing unit can also be independent processors, which are interconnected through technologies such as buses. The terminal device 700 may include multiple baseband processors to adapt to different network standards, and the terminal device 700 may include multiple central processing units to enhance its processing capabilities. The various components of the terminal device 700 may be connected through various buses. The baseband processor may also be described as a baseband processing circuit or a baseband processing chip. The central processing unit may also be described as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built into the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

[0247] In one example, the antenna with transceiver functions and the control circuit can be regarded as the transceiver unit 710 of the terminal device 700, and the processor with processing function can be regarded as the processing unit 720 of the terminal device 700. Figure 7 As shown, the terminal device 700 includes a transceiver unit 710 and a processing unit 720. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, etc. Optionally, the device used to implement the receiving function in the transceiver unit 710 may be regarded as a receiving unit, and the device used to implement the sending function in the transceiver unit 710 may be regarded as a sending unit, that is, the transceiver unit 710 includes a receiving unit and a sending unit. Exemplarily, the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0248] The present application also provides a network device, which can be used in the above embodiments. The network device includes a Figure 5 The means, units and / or circuits of the functions of the network device described in the illustrated embodiments are as follows: For example, the network device includes a transceiver module to support the network device to implement the transceiver function, and a processing module to support the network device to process signals.

[0249] Figure 8 A schematic diagram of the structure of a network device provided in an embodiment of the present application is given. Figure 8 As shown, the network device can be applied to the architecture shown in Figure 4. The network device includes: a baseband device 801, a radio frequency device 802, and an antenna 803. In the uplink direction, the radio frequency device 802 receives information sent by the terminal device through the antenna 803, and sends the information sent by the terminal device to the baseband device 801 for processing. In the downlink direction, the baseband device 801 processes the information of the terminal device and sends it to the radio frequency device 802, and the radio frequency device 802 processes the information of the terminal device and sends it to the terminal device through the antenna 803.

[0250] The baseband device 801 includes one or more processing units 8011, a storage unit 8012 and an interface 8013. The processing unit 8011 is used to support the network device to perform the functions of the network device in the above method embodiment. The storage unit 8012 is used to store software programs and / or data. The interface 8013 is used to interact with the radio frequency device 802. The interface includes an interface circuit for inputting and outputting information. In one implementation, the processing unit is an integrated circuit, such as one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip. The storage unit 8012 and the processing unit 8011 can be located in the same chip, that is, an on-chip storage element. Alternatively, the storage unit 8012 can also be on a different chip from the processing unit 8011, that is, an off-chip storage element. The storage unit 8012 can be a memory, or a general term for multiple memories or storage elements.

[0251] The network device may implement some or all of the steps in the above method embodiment in the form of one or more processing unit schedulers. Figure 5 The corresponding functions of the network device in the illustrated embodiment. The one or more processing units may support the same wireless access technology or different wireless access technologies.

[0252] Those of ordinary skill in the art will appreciate that the units and steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0253] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0254] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned computer-readable storage medium can be any available medium that can be accessed by a computer. By way of example and not limitation, computer-readable media may include random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), universal serial bus flash disk, mobile hard disk, or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer. In addition, by way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), or direct rambus RAM (DR RAM).

[0255] The above is only a specific implementation of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the embodiments of the present application, which should be included in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be based on the protection scope of the claims.

Claims

1. A cell reselection method, applied to a terminal device, characterized in that: The method comprises: When performing cell reselection, determining whether a cell in first candidate cells satisfies a first condition, wherein the first candidate cells include one or more cells; If a first cell among the first candidate cells meets the first condition, reselecting to the first cell; The first cell meeting the first condition includes: The first cell satisfies that a value of a first parameter within a first duration is greater than a first value, wherein the first value is related to a second parameter of the first cell, and the second parameter is used to indicate a coverage enhancement gain of a cell; The first parameter is RSRQ, the first value is the difference between a first threshold and the value of the second parameter of the first cell, and the first threshold is the value threshold of RSRQ of the one cell during cell reselection; and / or the first parameter is RSRP, the first value is the difference between a second threshold and the value of the second parameter of the first cell, and the second threshold is the value threshold of RSRP of the one cell during cell reselection.

2. The method according to claim 1, characterized in that The first value is related to the second parameter and a third parameter, and the third parameter is used to indicate a coverage enhancement gain of a service cell of the terminal device.

3. The method according to claim 1 or 2, characterized in that: The first parameter is RSRQ, S=Q+offset s -offset n , S represents the first value, Q represents the first threshold, offset s Indicates the value of the third parameter, offset n represents a value of the second parameter of the first cell, wherein the first threshold is a value threshold of the RSRQ of the first cell during cell reselection; and / or, The first parameter is RSRP, S=P+offset s -offset n , S represents the first value, offset s Indicates the value of the third parameter, offset n represents the value of the second parameter of the first cell, P represents the second threshold, and the second threshold is the value threshold of the RSRP of the first cell during cell reselection.

4. The method according to claim 1 or 2, characterized in that: The method further comprises: If none of the first candidate cells satisfies the first condition, determining whether any of the second candidate cells satisfies the second condition; If a second cell in the second candidate cells satisfies the second condition, reselecting to the second cell; The second cell meeting the second condition includes: The service cell of the terminal device satisfies that the value of the first parameter within the first time period is less than the second value, and the second cell satisfies that the value of the first parameter within the first time period is greater than a third value, wherein the second value is related to a third parameter, the third value is related to the second parameter of the second cell, and the third parameter is used to indicate the coverage enhancement gain of the service cell.

5. The method according to claim 4, characterized in that The first parameter is RSRQ, the second value is the sum of a third threshold and a value of the third parameter, and the third threshold is a value threshold of the RSRQ of the serving cell during cell reselection; and / or, The first parameter is RSRP, the second value is the sum of a fourth threshold and a value of the third parameter, and the fourth threshold is a value threshold of the RSRP of the serving cell during cell reselection.

6. The method according to claim 4, characterized in that The first parameter is RSRQ, the third value is a difference between a fifth threshold and a value of the second parameter of the second cell, and the fifth threshold is a value threshold of the RSRQ of the one cell during cell reselection; and / or, The first parameter is RSRP, the third value is the difference between a sixth threshold and a value of the second parameter of the second cell, and the sixth threshold is a value threshold of RSRP of the one cell during cell reselection.

7. The method according to claim 1 or 2, characterized in that: The method further comprises: In a case where none of the first candidate cells satisfies the first condition, determining a measurement value of a third candidate cell, where the third candidate cell includes a first type of cell and a second type of cell, the first type of cell supports coverage enhancement, the second type of cell does not support coverage enhancement, and the measurement value of the first type of cell is determined according to a value of the first parameter obtained by the terminal device measuring the first type of cell and a value of the second parameter of the first type of cell; According to the measurement value of the third candidate cell, reselect to a third cell among the third candidate cells.

8. The method according to claim 7, characterized in that The third cell is a cell with the largest measurement value among the third candidate cells; or, The third cell is a cell whose measurement value belongs to the first interval and whose corresponding number of downlink beams greater than the first quality threshold is the largest, and the first interval is used to indicate the best cell range.

9. The method according to claim 1 or 2, characterized in that: The method further comprises: If none of the first candidate cells satisfies the first condition, determining a first part of cells from third candidate cells, where the first part of cells includes at least one cell; Reselect to a third cell among the at least one cell.

10. The method according to claim 9, characterized in that The measurement value of the at least one cell is greater than a seventh threshold, and the measurement value of one cell among the at least one cell is determined according to the value of the first parameter obtained by the terminal device measuring the one cell.

11. The method according to claim 10, characterized in that The third cell is a cell that supports coverage enhancement and has the largest measurement value among the at least one cell.

12. The method according to claim 9, characterized in that The measurement values ​​of the at least one cell are all within the first interval, and the number of downlink beams corresponding to the at least one cell that is greater than the first quality threshold is greater than the eighth threshold, and the first interval is used to indicate the optimal cell range.

13. The method according to claim 12, characterized in that The third cell is the cell that supports coverage enhancement and has the largest number of corresponding downlink beams greater than the first quality threshold among the at least one cell.

14. The method according to claim 9, characterized in that The measurement values ​​of the at least one cell are all within the first interval.

15. The method according to claim 14, characterized in that The method further comprises: Determine an adjustment value for the number of downlink beams of a cell supporting coverage enhancement in the at least one cell, wherein the adjustment value is determined based on the number of downlink beams of the cell supporting coverage enhancement and a fourth parameter, and the fourth parameter is used to indicate the number of downlink beams of the cell.

16. The method according to claim 15, characterized in that The third cell is the cell having the largest number of corresponding downlink beams among the at least one cell.

17. The method according to claim 1 or 2, characterized in that: The method further comprises: If none of the first candidate cells satisfies the first condition, determining a measurement value of a third candidate cell; reselecting to a third cell having the largest measurement value among the third candidate cells; wherein determining the measurement value of the third candidate cell comprises one or more of the following: The measurement value of the first type of cells included in the third candidate cells is determined according to the value of the first parameter obtained by the terminal device measuring the first type of cells, the first type of cells includes one or more cells, and the first type of cells are cells that do not support coverage enhancement or reduced capability terminal equipment; The measurement value of the second type of cells included in the third candidate cells is determined according to the value of the first parameter obtained by the terminal device measuring the second type of cells and the value of the fifth parameter of the second type of cells, the second type of cells includes one or more cells, the second type of cells are cells that do not support coverage enhancement but support reduced capability terminal devices, and the fifth parameter is used to indicate whether reduced capability terminal devices are supported; The measurement value of the third type of cell included in the third candidate cell is determined according to the value of the first parameter obtained by the terminal device measuring the third type of cell and the value of the second parameter of the third type of cell, the third type of cell includes one or more cells, and the third type of cell is a cell that supports coverage enhancement but does not support reduced capability terminal equipment; or, The measurement value of the fourth type of cell included in the third candidate cell is determined based on the value of the first parameter obtained by the terminal device measuring the fourth type of cell, the value of the fifth parameter of the fourth type of cell, and the value of the second parameter of the fourth type of cell. The fourth type of cell includes one or more cells, and the fourth type of cell is a cell that supports coverage enhancement and supports reduced capability terminal equipment. The fifth parameter is used to indicate whether reduced capability terminal equipment is supported.

18. The method according to any one of claims 1 to 2, 5 to 6, 8, 10 to 16, characterized in that: The method further comprises: A first message is received from a serving cell, where the first message is used to indicate whether a neighboring cell of the serving cell supports a reduced capability terminal device and / or supports coverage enhancement.

19. The method according to claim 18, characterized in that The first message indicating whether the neighboring cell supports a reduced capability terminal device includes: The first message includes first indication information, where the first indication information is used to indicate that the neighboring cell supports reduced capability terminal equipment or does not support reduced capability terminal equipment; or, In a case where the first message includes the first indication information, indicating that the neighboring cell supports the reduced capability terminal device, and in a case where the first message does not include the first indication information, indicating that the neighboring cell does not support the reduced capability terminal device; or, In a case where the first message includes the value of the fifth parameter of the neighboring cell, indicating that the neighboring cell supports a reduced capability terminal device; in a case where the first message does not include the value of the fifth parameter of the neighboring cell, indicating that the neighboring cell does not support a reduced capability terminal device, the fifth parameter being used to indicate whether a reduced capability terminal device is supported; or, When the value of the fifth parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports reduced capability terminal equipment. When the value of the fifth parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support reduced capability terminal equipment. The fifth parameter is used to indicate whether reduced capability terminal equipment is supported.

20. The method according to claim 18, characterized in that The first message indicates whether the neighboring cell supports reduced capability terminal equipment, including one or more of the following: In a case where the first message indicates that the neighboring cell supports coverage enhancement, indicating that the neighboring cell supports reduced capability terminal equipment, and in a case where the first message indicates that the neighboring cell does not support coverage enhancement, indicating that the neighboring cell does not support reduced capability terminal equipment; In a case where the first message indicates that the neighboring cell has configured random access resources for the reduced capability terminal device, indicating that the neighboring cell supports reduced capability terminal devices, and in a case where the first cell indicates that the neighboring cell has not configured random access resources for the reduced capability terminal device, indicating that the neighboring cell does not support reduced capability terminal devices; or, When the first message indicates that the neighboring cell has configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell supports the reduced capability terminal device; when the first message indicates that the neighboring cell has not configured an initial uplink BWP for the reduced capability terminal device, it indicates that the neighboring cell does not support the reduced capability terminal device.

21. The method according to claim 18, characterized in that The first message indicates whether the neighboring cell supports coverage enhancement, including one or more of the following: In a case where the first message includes the value of the second parameter of the neighboring cell, indicating that the neighboring cell supports coverage enhancement; in a case where the first message does not include the value of the second parameter of the neighboring cell, indicating that the neighboring cell does not support coverage enhancement; When the value of the second parameter of the neighboring cell included in the first message is not equal to 0, it indicates that the neighboring cell supports coverage enhancement; when the value of the second parameter of the neighboring cell included in the first message is equal to 0, it indicates that the neighboring cell does not support coverage enhancement; The first message includes second indication information, where the second indication information is used to indicate whether the neighboring cell supports coverage enhancement or does not support coverage enhancement; or, In case that the first message includes the second indication information, it indicates that the neighboring cell supports coverage enhancement; in case that the first message does not include the second indication information, it indicates that the neighboring cell does not support coverage enhancement.

22. A terminal device, characterized in that: include: one or more processors; one or more memories; and one or more computer programs, wherein the one or more computer programs are stored in the one or more memories, and the one or more computer programs include instructions, which, when executed by one or more processors of the terminal device, enable the terminal device to perform the method as described in any one of claims 1 to 21.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 21.

24. A chip, characterized in that: The system comprises one or more processors and a communication interface, wherein the one or more processors are used to read instructions to execute the method according to any one of claims 1 to 21.

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