RU2799879C1 - Equipment and method for cell selection - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: group of inventions is related to equipment and a method for selecting a cell. The communication terminal is configured to determine the first measurement frequency and the 5G anchor cell at the first measurement frequency based on the previous historical information. The communication terminal is configured to shorten the evaluation duration corresponding to the 5G anchor cell that satisfies the preferred condition at the first measurement frequency.

EFFECT: increase of the likelihood that the terminal will gain connection to the 5G anchor cell, thereby improving the communication quality of the terminal.

13 cl, 18 dwg, 1 tbl

Description

[0001] The present application claims the priority of China Patent Application No. 202010039106.8, filed with the National Intellectual Property Office of China on January 14, 2020, entitled "CELL SELECTION METHOD AND APPARATUS", which is hereby incorporated by reference in its entirety.

FIELD OF TECHNOLOGY

[0002] Embodiments of this application relate to the field of communication and, in particular, to the apparatus and method of selecting a cell.

BACKGROUND OF THE INVENTION

[0003] In existing non-standalone (NSA) networks, there is usually a 5G anchor cell in the network. In the process of selecting the current cell, the frequency is usually selected based on the energy level of the frequency to which the cell belongs, or the measurement result of the cell. If a frequency corresponding to a 5G anchor cell is not selected, the terminal camps on a non-5G anchor cell, such as a 4G cell. However, in fact, the terminal can obtain a higher transmission rate when camping on a 5G anchor cell compared to camping on a 4G cell.

SUMMARY OF THE INVENTION

[0004] This application provides a cell selection apparatus and method to increase the likelihood that a terminal camps on a 5G anchor cell to some extent.

[0005] To achieve the above goal, the following technical solutions are used in this application:

[0006] According to a first aspect, an embodiment of this application provides a cell selection method. The method includes: the terminal receives a configuration message sent by a network side, wherein the configuration message includes frequency information. The terminal determines the first measurement frequency based on the locally stored previous historical (historical) information and the configuration message, wherein the cell on which the historical anchoring corresponding to the first measurement frequency was performed includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell. Then, the terminal performs a cell measurement at the first measurement frequency and obtains a measurement result at the first measurement frequency, the measurement result including first cell ID information for the first cell at the first measurement frequency and a first cell measurement result corresponding to the first cell ID information. Then, the terminal determines, based on the previous history information and the first cell ID information, whether the first cell is the 5G anchor cell. In this application, if the first cell is a 5G cell and meets the preferred condition, the terminal estimates the first cell based on the first preset duration. If the first cell is not a 5G cell, the terminal estimates the first cell based on the second preset duration, the second preset duration being greater than the first preset duration. When the estimation result of the first cell satisfies the predetermined condition, the terminal camps on the first cell, or the terminal reports the measurement result of the first cell to the base station.

[0007] Based on the foregoing, it is realized that the terminal can determine, based on the locally stored prior history information, the first measurement frequency, where the first measurement frequency is a 5G LTE frequency, and the cell on which history has been assigned corresponding to said frequency includes a 5G anchor cell, and perform cell measurement at the first measurement frequency. Then, the terminal can further determine, based on the previous history information, the 5G anchor cell that is at the first measurement frequency and whose cell measurement result has been obtained, and optimize the 5G anchor cell evaluation policy that satisfies the preferred condition to increase the probability that the 5G anchor cell is selected as the serving cell, thereby improving the communication quality of the terminal.

[0008] In an exemplary implementation, the preferred condition includes: the measurement result of the first cell is greater than or equal to the first threshold, or the difference between the QoS of the currently anchored serving cell, which is obtained by the terminal through the measurement, and the measurement result of the first cell is less than or equal to the second threshold.

[0009] Based on the foregoing, it is realized that the terminal can predetermine a 5G anchor cell that meets the "good cell" requirement to increase the probability that the 5G anchor cell is selected as a serving cell in a subsequent process.

[0010] In an exemplary implementation, the prior history information includes frequency history information of at least one frequency and cell information for a cell on which history has been anchored corresponding to each of the at least one frequency, the cell information including cell type information.

[0011] Based on the above, it is realized that the terminal can store the previous history information, and the previous history information records the frequency information of each frequency and the cell information of each frequency. The terminal may determine the 5G LTE frequency and the 5G anchor cell based on the frequency information and/or cell information.

[0012] In an exemplary implementation, the frequency information includes reselection frequency information for the reselection frequency, a priority corresponding to the reselection frequency, a first measurement threshold, and a second preset evaluation duration; and that the terminal determines the first measurement frequency based on the locally stored previous history information and the configuration message includes: the terminal determines the first measurement frequency based on the previous history information and reselection rate information.

[0013] Based on the above, it is realized that in the reselection scenario, the terminal can determine, based on the previous history information, the first measurement frequency in the reselection frequencies configured on the network side, that is, determine the frequency of the cell on which the history camping was performed, including the 5G anchor cell.

[0014] In an exemplary implementation, after the terminal determines the first measurement frequency based on the previous history information and the reselection frequency information, the method includes: if the quality of service of the serving cell on which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, the terminal increases the first measurement threshold to exceed the quality of service of the serving cell.

[0015] Based on the foregoing, it is realized that after the terminal determines that it is necessary to measure the first measurement frequency, the terminal can improve the first measurement threshold configured on the network side so that the quality of service of the serving cell is lower than the first measurement threshold, and then cell measurement can be performed at all frequencies configured on the network side, including performing cell measurement at frequencies whose priorities are higher than, equal to, or lower than the priority of the frequency to which the serving cell belongs. That is, the measurement coverage includes a low priority 5G LTE frequency that is not initially within the measurement range.

[0016] In an exemplary implementation, after the terminal determines the first measurement frequency based on the previous historical information and the reselection frequency information, the method includes: if the quality of service of the serving cell to which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, the terminal determines that the priority of the first measurement frequency is the second priority, the second priority being higher than the first priority. Accordingly, estimating the first cell based on the first preset duration includes: the terminal estimates the first cell using a high priority threshold, the high priority threshold being included in the configuration message.

[0017] Based on the above, it is realized that the terminal can improve the priority of the first measurement frequency, which has a low priority, so that the priority of the first measurement frequency becomes a high priority, so that the first measurement frequency, which did not meet the measurement requirement, meets the measurement requirement.

[0018] In an exemplary implementation, if the first cell is a 5G anchor cell and meets the preferred condition, the method further includes: if the priority of the first measurement frequency is less than or equal to the first priority corresponding to the frequency of the serving cell on which the terminal is currently anchored, determining that the priority of the first measurement frequency is the second priority, wherein the second priority is higher than the first priority; and estimating the first cell based on the first preset duration includes: the terminal estimates the first cell using a high priority threshold, the high priority threshold being included in the configuration message.

[0019] Based on the above, it is realized that the terminal can improve the priority of the first measurement frequency, so that the terminal estimates the first cell using the high priority threshold, thereby increasing the probability that the first cell is estimated successfully, to further increase the probability that the first cell (i.e., the 5G anchor cell) will be selected as the serving cell.

[0020] In an exemplary implementation, the preset rule is a cell reselection rule, and the preset rule includes: the measurement result of the first cell is optimal in the obtained cell measurement results; or the difference between the measurement result of the first cell and the obtained optimal value in the measurement results of the cell is less than or equal to the third threshold.

[0021] Based on the above, it can be realized that in the reselection scenario, when the terminal determines that there are many estimated cells at the same frequency, the terminal can select the first cell that matches the preset rule, that is, the 5G anchor cell to camp on.

[0022] In an exemplary implementation, the frequency information includes frequency handoff information for the handover frequency, a second measurement threshold, and a second preset estimation duration. That the terminal determines the first measurement frequency based on the locally stored previous history information, and the configuration message includes: the terminal determines the first measurement frequency based on the previous history information and frequency handover information; and if the quality of service of the serving cell on which the terminal is currently anchored is less than the second measurement threshold, and the serving cell is not a 5G anchor cell, the terminal increases the second measurement threshold to exceed the quality of service of said serving cell.

[0023] Based on the foregoing, it is realized that in the handover scenario, the terminal can determine, based on the previous history information, the first measurement frequency in the handover frequencies configured on the network side, that is, determine the frequency of the cell on which history camping was performed, including the 5G anchor cell. In addition, after determining the first measurement frequency, the terminal may adjust the current measurement policy so that the first measurement frequency meets the measurement requirement to perform a cell measurement at the first measurement frequency.

[0024] In an exemplary implementation, the preset condition is a cell handoff condition.

[0025] In an exemplary implementation, before the terminal estimates the first cell based on the first preset duration, the method further includes: the terminal adds the measurement result of the first cell to obtain the measurement result of the second cell, wherein the difference between the measurement result of the second cell and the measurement result of the first cell is less than or equal to a fourth threshold; and estimating the first cell based on the first preset duration includes: the terminal estimating the measurement result of the second cell; and the measurement result of the first cell and the measurement result of the second cell include at least one of a received reference signal power (RSRP) and a signal-to-interference plus noise ratio (SINR).

[0026] Based on the above, it is realized that the terminal can improve the gain of the first cell, that is, the measurement result of the first cell, so that the first cell satisfies the evaluation criterion, thereby further increasing the probability that the first cell is selected as a serving cell.

[0027] In an exemplary implementation, if the first cell is not a 5G anchor cell and the terminal camps on the first cell, the method further includes: the terminal receives a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and the terminal respectively writes the neighbor cell ID information and the cell type information into the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[0028] Based on the foregoing, it is realized that the terminal can acquire cell ID information and cell type information of the neighbor cell in the background search mode, and record cell ID information and cell type information in the previous history information. The terminal may perform a subsequent pinning operation based on the received prior history information.

[0029] In an exemplary implementation, cell type information is included in the system message SIB2 of the neighbor cell.

[0030] Based on the foregoing, it is realized that in the background search process, the terminal can obtain the cell type information of the neighbor cell by reading the SIB2 of the neighbor cell and write the cell type information to the previous history information.

[0031] According to a second aspect, an embodiment of this application provides a cell selection method. The method includes: the terminal determines at least one candidate frequency based on locally stored prior historical information, wherein at least one 5G LTE frequency is included in at least one candidate frequency, the cell on which the history anchoring corresponding to the 5G LTE frequency was performed includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell; the terminal performs an energy scan on the at least one candidate frequency to obtain an energy scan result of the one candidate frequency on the at least one candidate frequency; if the preferred frequency is included in at least one 5G LTE frequency, the terminal preferably performs a cell search on the preferred frequency, and the energy scan result of the preferred frequency matches the preferred condition; and if a first cell exists on the preferred frequency that satisfies the camping condition, the terminal camps on the first cell.

[0032] Based on the foregoing, it is realized that the terminal can improve the search order of the preferred frequency that meets the preferred condition, so that the preferred frequency preferentially performs a cell search, thereby increasing the probability that a 5G anchor cell on the preferred frequency is selected as a serving cell.

[0033] In an exemplary implementation, the prior history information includes frequency information of at least one candidate frequency and cell information of some cell at one candidate frequency. That the terminal determines at least one candidate frequency based on the locally stored prior history information includes: the terminal determines the 5G LTE frequency based on the frequency information, the frequency information including frequency type information; or the terminal determines the 5G LTE frequency based on the cell information, where the cell information includes cell type information.

[0034] Based on the above, it is realized that the terminal can determine the frequency type of each frequency by retrieving the locally stored prior history information to obtain a frequency whose frequency type is a 5G LTE frequency.

[0035] In an exemplary implementation, the preferred condition includes: the preferred frequency energy scan result is greater than or equal to a first threshold; or the difference between the energy scan result corresponding to the candidate frequency with the highest energy scan result and the energy scan result corresponding to the preferred frequency is less than or equal to the second threshold.

[0036] Based on the above, it is realized that the terminal can perform the subsequent optimization process on the 5G LTE frequency that meets the preferred condition, and does not need to perform the subsequent optimization process on the 5G LTE frequency and non-5G LTE frequency (other than 5G) that do not meet the preferred condition.

[0037] In an exemplary implementation, that the terminal camps on the first cell includes: the terminal obtains a cell search result on a preferred frequency, the cell search result including cell ID information and a cell measurement result corresponding to the cell ID information; and the terminal determines the preferred cell based on the previous history information, the cell ID information, and the corresponding cell measurement result, and camps on the preferred cell; and the preferred cell is a 5G anchor cell that meets the camping condition.

[0038] Based on the above, it is realized that the terminal can further determine the 5G anchor cell on the same frequency by extracting the previous history information based on the ID information of each cell in the obtained cell search result, and the terminal can try to camp on the 5G reference cell that meets the camping condition, thereby improving the communication quality of the terminal.

[0039] In an exemplary implementation, the sticky condition includes: a cell measurement result for the preferred cell is optimal in the obtained cell measurement results; or the difference between the cell measurement result of the preferred cell and the obtained optimal cell measurement result value is less than or equal to the fourth threshold.

[0040] Based on the above, it is realized that a terminal can select, based on a preset camping condition, a 5G anchor cell that meets the "good cell" criterion on the same frequency, and camp on the 5G anchor cell.

[0041] In an exemplary implementation, if the serving cell on which the terminal camps is a non-5G anchor cell, the method further includes: the terminal receives a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and the terminal respectively writes the neighbor cell ID information and the cell type information into the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[0042] In an exemplary implementation, cell type information is included in the system message SIB2 of the neighbor cell.

[0043] According to a third aspect, an embodiment of this application provides hardware, wherein the hardware includes a memory and a processor, and the memory is coupled to the processor. The memory stores a program instruction, and when the program instruction is executed by the processor, the apparatus may perform the following steps: receiving a configuration message sent by the network side, the configuration message including frequency information; determining a first measurement frequency based on the locally stored historical history information and the configuration message, wherein the cell on which the history anchoring corresponding to the first measurement frequency was performed includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell; performing a cell measurement at the first measurement frequency to obtain a measurement result of the first measurement frequency, the measurement result including first cell ID information and a first cell measurement result corresponding to the first cell ID information; determining, based on the previous history information and the first cell ID information, whether the first cell is the 5G anchor cell; if the first cell is a 5G anchor cell and meets the preferred condition, estimating the first cell based on the first preset duration, or if the first cell is not a 5G anchor cell, estimating the first cell based on the second preset duration, the second preset duration being greater than the first preset duration; and when the estimation result of the first cell satisfies the predetermined condition, camping by the terminal on the first cell or reporting by the terminal the measurement result of the first cell to the base station.

[0044] In an exemplary implementation, the preferred condition includes: the measurement result of the first cell is greater than or equal to the first threshold, or the difference between the quality of service of the currently anchored serving cell, which is obtained by the terminal through the measurement, and the measurement result of the first cell is less than or equal to the second threshold.

[0045] In an exemplary implementation, the prior history information includes frequency history information of at least one frequency and cell information for a cell on which history has been anchored corresponding to each of the at least one frequency, the cell information including cell type information.

[0046] In an exemplary implementation, the frequency information includes reselection frequency reselection frequency information, a priority corresponding to the reselection frequency, a first measurement threshold, and a second evaluation preset duration; and when the program instruction is executed by the processor, the apparatus may perform the following steps: determining the first measurement frequency based on the previous history information and the reselection frequency information.

[0047] In an exemplary implementation, when a program instruction is executed by the processor, the hardware may perform the following step: if the quality of service of the serving cell on which the terminal is currently camped is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is less than or equal to the first priority corresponding to the frequency to which the serving cell belongs, increasing the first measurement threshold so that it exceeds the quality of service of the serving cell.

[0048] In an exemplary implementation, when a program instruction is executed by the processor, the hardware may perform the following step: if the quality of service of the serving cell on which the terminal is currently anchored is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, determining by the terminal that the priority of the first measurement frequency is the second priority, with the second priority being higher than the first priority. Accordingly, estimating the first cell based on the first preset duration includes: the terminal estimates the first cell using a high priority threshold, the high priority threshold being included in the configuration message.

[0049] In an exemplary implementation, if the first cell is a 5G anchor cell and meets the preferred condition when a program instruction is executed by the processor, the hardware may perform the following step: if the priority of the first measurement frequency is less than or equal to the first priority corresponding to the frequency of the serving cell on which the terminal is currently anchored, determining that the priority of the first measurement frequency is the second priority, with the second priority higher than the first priority; and estimating the first cell using the high priority threshold, the high priority threshold being included in the configuration message.

[0050] In an exemplary implementation, the preset rule is a cell reselection rule, and the preset rule includes: the measurement result of the first cell is optimal in the obtained cell measurement results; or the difference between the first cell measurement result and the obtained optimum value in the cell measurement results is less than or equal to the third threshold.

[0051] In an exemplary implementation, the frequency information includes frequency handover information for frequency handover, a second measurement threshold, and a second preset estimation duration. When the program instruction is executed by the processor, the apparatus may perform the following steps: determining the first measurement frequency based on the previous historical information and the frequent handoff information; and if the quality of service of the serving cell on which the terminal is currently camped is less than the second measurement threshold, and the serving cell is not a 5G anchor cell, increasing the second measurement threshold to exceed the quality of service of the serving cell.

[0052] In an exemplary implementation, when a program instruction is executed by a processor, the hardware may perform the following steps: adding a first cell measurement to obtain a second cell measurement, wherein the difference between the second cell measurement and the first cell measurement is less than or equal to a fourth threshold; and evaluating the measurement result of the second cell; and the measurement result of the first cell and the measurement result of the second cell include at least one of a received reference signal power (RSRP) and a signal-to-interference plus noise ratio (SINR).

[0053] In an exemplary implementation, if the first cell is not a 5G anchor cell, and the terminal camps on the first cell when a program instruction is executed by the processor, the hardware may perform the following steps: receiving a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and, accordingly, recording the neighbor cell ID information and the cell type information in the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[0054] In an exemplary implementation, cell type information is included in the system message SIB2 of the neighbor cell.

[0055] According to a fourth aspect, an embodiment of this application provides hardware, wherein the hardware includes a memory and a processor, and the memory is coupled to the processor. The program instruction is stored in memory. When a program instruction is executed by the processor, the hardware may perform the following steps: determining at least one frequency candidate based on the locally stored prior history information, wherein at least one 5G LTE frequency is included in at least one candidate frequency, the cell on which history camping was performed corresponding to the 5G LTE frequency includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell in as a secondary cell; performing an energy scan on the at least one candidate frequency to obtain an energy scan result of the one candidate frequency on the at least one candidate frequency; if the preferred frequency is included in at least one 5G LTE frequency, preferentially performing a cell search on the preferred frequency when the energy scan result of the preferred frequency meets the preferred condition; and if the first cell that satisfies the camping condition exists on the preferred frequency, camping by the terminal on the first cell.

[0056] In an exemplary implementation, the prior history information includes frequency information of at least one candidate frequency and cell information at one candidate frequency. That the terminal determines at least one candidate frequency based on the locally stored prior history information includes: the terminal determines the 5G LTE frequency based on the frequency information, the frequency information including frequency type information; or the terminal determines the 5G LTE frequency based on the cell information, where the cell information includes cell type information.

[0057] In an exemplary implementation, the preferred condition includes: the preferred frequency energy scan result is greater than or equal to a first threshold; or the difference between the energy scan result corresponding to the candidate frequency with the highest energy scan result and the energy scan result corresponding to the preferred frequency is less than or equal to the second threshold.

[0058] In an exemplary implementation, when a program instruction is executed by a processor, the hardware may perform the following steps: obtaining a cell search result on a preferred frequency, the cell search result including cell ID information and a cell measurement result corresponding to the cell ID information; and determining a preferred cell based on the previous history information, the cell ID information, and the corresponding cell measurement result, and attaching to the preferred cell; and the preferred cell is a 5G anchor cell that meets the camping condition.

[0059] In an exemplary implementation, the sticky condition includes: a preferred cell measurement result is optimal in the obtained cell measurement results; or the difference between the cell measurement result of the preferred cell and the obtained optimal cell measurement result value is less than or equal to the third threshold.

[0060] In an exemplary implementation, if the serving cell on which the terminal camps is a non-5G anchor cell, when the program instruction is executed by the processor, the apparatus may perform the following steps: receiving a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and, accordingly, recording the neighbor cell ID information and the cell type information in the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive the system message.

[0061] In an exemplary implementation, cell type information is included in the system message SIB2 of the neighbor cell.

[0062] According to a fifth aspect, an embodiment of this application provides hardware, the hardware including a transceiver module and a processing module; and the transceiver module is configured to receive the configuration message sent by the network side, the configuration message including frequency information. The processing module is configured to determine the first measurement frequency based on the locally stored previous historical information and the configuration message, the cell on which the historical anchoring corresponding to the first measurement frequency was performed includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell. The processing unit is configured to perform cell measurement at the first measurement frequency to obtain a measurement result of the first measurement frequency, the measurement result including first cell ID information and a first cell measurement result corresponding to the first cell ID information. The processing unit is further configured to determine, based on the previous history information and the first cell ID information, whether the first cell is the 5G anchor cell. The processing unit is further configured to: if the first cell is a 5G anchor cell and meets the preferred condition, estimating the first cell based on the first preset duration. The processing unit is further configured to: if the first cell is not a 5G anchor cell, estimating the first cell based on the second preset duration, the second preset duration being greater than the first preset duration. The processing unit is further configured to: when the estimation result of the first cell meets the predetermined condition, camping on the first cell or reporting, by the transceiver unit, the measurement result of the first cell to the base station.

[0063] In an exemplary implementation, the preferred condition includes: the measurement result of the first cell is greater than or equal to the first threshold, or the difference between the measurement result of the cell for the currently camping serving cell, which is obtained by the terminal through the measurement, and the measurement result of the first cell is less than or equal to the second threshold.

[0064] In an exemplary implementation, the prior history information includes frequency history information of at least one frequency and cell information for a cell on which history has been anchored corresponding to each of the at least one frequency, the cell information including cell type information.

[0065] In an exemplary implementation, the frequency information includes reselection frequency information for the reselection frequency, a priority corresponding to the reselection frequency, a first measurement threshold, and a second evaluation preset duration; and the processing unit is specifically configured to determine the first measurement frequency based on the previous history information and the reselection frequency information.

[0066] In an exemplary implementation, the processing module is further configured to: if the quality of service of the serving cell on which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is less than or equal to the first priority corresponding to the frequency to which the serving cell belongs, increasing the first measurement threshold by the terminal to exceed the quality of service of the serving cell.

[0067] In a possible implementation, the processing module is further configured to: if the quality of service of the serving cell on which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, determining that the priority of the first measurement frequency is the second priority, and the second priority is higher than the first priority. The processing module may be further specifically configured to estimate the first cell using the high priority threshold, with the high priority threshold included in the configuration message.

[0068] In an exemplary implementation, if the first cell is a 5G anchor cell and meets the preferred condition, the processing module is further configured to: if the priority of the first measurement frequency is less than or equal to the first priority corresponding to the frequency of the serving cell on which the terminal is currently anchored, determining that the priority of the first measurement frequency is the second priority, with the second priority higher than the first priority; and the processing module is further configured to estimate the first cell using the high priority threshold, the high priority threshold being included in the configuration message.

[0069] In an exemplary implementation, the preset rule is a cell reselection rule, and the preset rule includes: the measurement result of the first cell is optimal in the obtained cell measurement results; or the difference between the measurement result of the first cell and the obtained optimal value in the measurement results of the cell is less than or equal to the third threshold.

[0070] In an exemplary implementation, the frequency information includes frequency handover information for frequency handover, a second measurement threshold, and a second preset estimation duration. The processing unit is specifically configured to determine the first measurement frequency based on the previous history information and the frequency handover information; and if the quality of service of the serving cell on which the terminal is currently anchored is less than the second measurement threshold, and the serving cell is not a 5G anchor cell, the processing module increases the second measurement threshold to exceed the quality of service of the serving cell.

[0071] In an exemplary implementation, the preset condition is a cell handoff condition.

[0072] In an exemplary implementation, the processing module is further configured for the terminal to add the measurement result of the first cell to obtain the measurement result of the second cell, wherein the difference between the measurement result of the second cell and the measurement result of the first cell is less than or equal to a fourth threshold; and the processing unit may be further specifically configured to evaluate the measurement result of the second cell by the terminal; and the measurement result of the first cell and the measurement result of the second cell include at least one of a received reference signal power (RSRP) and a signal-to-interference plus noise ratio (SINR).

[0073] In an exemplary implementation, if the first cell is not a 5G anchor cell and the terminal camps in the first cell, the processing module is further configured to receive a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information. The processing unit is further configured to appropriately write the neighbor cell ID information and the cell type information to the previous history information, the neighbor cell being a cell configured on the network side, or the neighbor cell being a cell from which the terminal can receive the system message.

[0074] In an exemplary implementation, the cell type information is included in the system message SIB2 of the neighbor cell.

[0075] According to a sixth aspect, an embodiment of this application provides a hardware, the hardware including a processing module, an energy scanning module, and a cell search module. The processing module is configured to determine at least one candidate frequency according to the locally stored prior history information, wherein at least one 5G LTE frequency is included in at least one candidate frequency, and the cell on which the 5G LTE frequency has been historically anchored includes a 5G anchor cell, and the 5G anchor cell is an LTE Long Term Evolution cell that uses a 5G cell as a secondary cell. The energy scanning module is configured to perform an energy scan on at least one candidate frequency to obtain an energy scan result of one candidate frequency on at least one candidate frequency. The cell search module is configured to: if the preferred frequency is included in at least one 5G LTE frequency, preferentially perform a cell search on the preferred frequency if the energy scan result of the preferred frequency meets the preferred condition. The processing unit is further configured to: if a first cell meeting the camping condition exists at the preferred frequency, camping on the first cell.

[0076] In an exemplary implementation, the prior history information includes frequency information for at least one candidate frequency and cell information for one frequency candidate. That the terminal determines at least one candidate frequency based on the locally stored prior history information includes: the terminal determines the 5G LTE frequency based on the frequency information, the frequency information including frequency type information; or the terminal determines the 5G LTE frequency based on the cell information, where the cell information includes cell type information.

[0077] In an exemplary implementation, the preferred condition includes: the preferred frequency energy scan result is greater than or equal to a first threshold; or the difference between the energy scan result corresponding to the candidate frequency with the highest energy scan result and the energy scan result corresponding to the preferred frequency is less than or equal to the second threshold.

[0078] In an exemplary implementation, the processing module is specifically configured to obtain a preferred frequency cell search result, the cell search result including cell ID information and a cell measurement result corresponding to the cell ID information; and determining the preferred cell based on the previous history information, the cell ID information, and the measurement result of the corresponding cell, and camping on the preferred cell; and the preferred cell is a 5G anchor cell that meets the camping condition.

[0079] In an exemplary implementation, the sticky condition includes: a cell measurement result for the preferred cell is optimal in the obtained cell measurement results; or the difference between the cell measurement result of the preferred cell and the obtained optimal cell measurement result value is less than or equal to the third threshold.

[0080] In an exemplary implementation, if the serving cell on which the terminal is anchored is a non-5G anchor cell, the processing module is further configured to receive a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and the processing unit is further configured to appropriately record the neighbor cell ID information and the cell type information in the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[0081] In an exemplary implementation, the cell type information is included in the system message SIB2 of the neighbor cell.

[0082] According to a seventh aspect, an embodiment of this application provides a computer-readable medium configured to store a computer program, the computer program including an instruction used to perform the method according to the first aspect, or any possible implementation of the first aspect.

[0083] According to an eighth aspect, an embodiment of this application provides a computer-readable medium configured to store a computer program, the computer program including an instruction used to perform a method according to the second aspect, or any possible implementation of the second aspect.

[0084] According to a ninth aspect, an embodiment of this application provides a computer program, the computer program including an instruction used to perform a method according to the first aspect, or any possible implementation of the first aspect.

[0085] According to a tenth aspect, an embodiment of this application provides a computer program, the computer program including an instruction used to perform a method according to the second aspect, or any possible implementation of the second aspect.

[0086] According to an eleventh aspect, an embodiment of this application provides a chip, the chip including a processing circuit and a transceiver output. The transceiver terminal and the processing circuit communicate with each other using an internal connection channel, and the processing circuit performs a method according to any of the first aspect or possible implementations of the first aspect to control a receive terminal to receive a signal and control a transmit terminal to send a signal.

[0087] According to a twelfth aspect, an embodiment of this application provides a chip, the chip including a processing circuit and a transceiver output. The transceiver terminal and the processing circuit communicate with each other using an internal connection channel, and the processing circuit performs a method according to any of the possible implementations of the first aspect or the second aspect to control a receive terminal to receive a signal and control a transmit terminal to send a signal.

BRIEF DESCRIPTION OF THE DRAWINGS

[0088] FIG. 1 is a schematic representation of an exemplary communication system;

[0089] FIG. 2 is a schematic block diagram of an exemplary terminal;

[0090] FIG. 3a is a schematic representation of an exemplary application scenario;

[0091] FIG. 3b is a schematic representation of an exemplary application scenario;

[0092] FIG. 3c is a schematic representation of an exemplary application scenario;

[0093] FIG. 4 is a flowchart of a cell selection method according to an embodiment of this application;

[0094] FIG. 5 is a flowchart of a cell selection method according to an embodiment of this application;

[0095] FIG. 6 is a flowchart of a cell selection method according to an embodiment of this application;

[0096] FIG. 7 is a flowchart of a cell selection method according to an embodiment of this application;

[0097] FIG. 8 is a flowchart of a cell selection method according to an embodiment of this application;

[0098] FIG. 9A-FIG. 9B is a flowchart of a cell selection method according to an embodiment of this application;

[0099] FIG. 10 is a flowchart of a cell selection method according to an embodiment of this application;

[00100] FIG. 11 is a flowchart of a cell selection method according to an embodiment of this application;

[00101] FIG. 12 is a flowchart of a cell selection method according to an embodiment of this application;

[00102] FIG. 13 is a block diagram of a terminal according to an embodiment of the present application;

[00103] FIG. 14 is a schematic block diagram of a terminal according to an embodiment of this application; And

[00104] FIG. 15 is a block diagram of a hardware according to an embodiment of this application.

Description of Embodiments

[00105] The following clearly and fully describes the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the embodiments described are some, and not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by a person skilled in the art without creative effort fall within the protection scope of this application.

[00106] In this specification, the term "and/or" is only used to describe an association relationship between associated objects and indicates that three relationships can exist. For example, A and/or B could mean that only A exists, both A and B exist, and only B exists.

[00107] In the description and claims, the terms "first", "second", "third", "fourth", etc. are intended to distinguish between different objects, but do not indicate a specific order of objects. For example, the first target and the second target are used to distinguish between different targets and are not used to describe a particular order of targets.

[00108] In embodiments of this application, a word such as "example" or "for example" is used to represent an example, illustration, or description. Any embodiment or design described as "example" or "example" in the embodiments of this application should not be explained as preferable or more advantageous than another embodiment or design. In particular, the use of the word "example" or "for example" is intended to present the concept in a particular way.

[00109] In the descriptions of the embodiments of this application, unless otherwise indicated, "many" means two or more than two. For example, a plurality of processing units refers to two or more processing units. Multiple systems refers to two or more systems; and multiple systems refer to two or more systems.

[00110] Before describing the technical solutions in the embodiments of this application, the communication system of the embodiments of this application is first described with reference to the accompanying drawings. Fig. 1 is a schematic representation of a communication system in accordance with an embodiment of this application. The communication system includes a base station 1, a base station 2, a base station 3, a base station 4, and a terminal. In a specific implementation process of this embodiment of this application, the terminal may be a device such as a computer, smart phone, telephone, cable TV set-top box, or digital subscriber line router. It should be noted that in an actual application there may be one or more base stations and terminals. The number of base stations and terminals in the communication system shown in FIG. 1 is only an example of adaptation. In this application, it is expressly not limited.

[00111] The communication system may be configured to support a fourth generation (4G) access technology such as long term evolution (LTE) access technology. Alternatively, the communication system may support a fifth generation access technology (5G), such as new radio access technology (new radio, NR). Alternatively, the communication system may be configured to support a third generation (3G) access technology such as a universal mobile telecommunications system (UMTS) access technology. Alternatively, the communication system may be configured to support a second generation (2G) access technology, such as a global system for mobile communications (GSM) access technology. Alternatively, the communication system may be further configured to support communication systems of multiple wireless technologies, such as support for LTE technology and NR technology. In addition, the communication system can also be applied to the Narrow Band-Internet of Things (NB-IoT), the Enhanced Data rate for GSM Evolution (EDGE) GSM development system, the Wideband Code Division Multiple Access (WCDMA) system, the Code Division Multiple Access (CDMA2000) system, the time division multiple access system, and code division synchronization (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), long-term evolution (Long Term Evolution, LTE) and future-oriented communication technology.

[00112] The base station in FIG. 1 can be configured to support terminal access. For example, the base station in FIG. 1 can be a base transceiver station (BTS) and a base station controller (BSC) in a 2G access technology communication system, a node B (node B) and a radio network controller (RNC) in a 3G access technology communication system, an evolved node B (evolved nodeB, eNB) in a 4G access technology communication system, a next Generation nodeB (gNB) in a communication system with 5G access technology, a transmission node and a receiving point (transmit and receive point, TRP), a relay node (relay node), an access point (AP), etc. For ease of description, in all embodiments of this application, the hardware for providing a wireless communication function to terminals is collectively referred to as network devices or base stations.

[00113] The terminal in FIG. 1 may be a device providing voice or data communications to a user, for example, a terminal may also be referred to as a mobile station, subscriber unit, station, or terminal equipment (TE). The terminal may be a cellular phone (cellular phone), a personal digital assistant (PDA), a wireless modem (modem), a handheld device (handheld), a laptop computer (laptop computer), a cordless phone (cordless phone), a wireless local area network station (Wireless Local Loop, WLL), a tablet computer (pad), etc. With the development of wireless communication technologies, the terminal in this embodiment of this application may be a device that can access the communication system, can communicate with the network side of the communication system, or can communicate with another entity using the communication system, such as a terminal or a vehicle in smart traffic, a home device in a smart home, a smart grid electricity meter reader, a voltage monitoring device, an environmental monitoring device, a smart security network video monitoring device, or a cash register. In this embodiment of this application, the terminal may communicate with a base station, such as the base station of FIG. 1. A plurality of terminals may communicate with each other. The terminal may be fixed or may be mobile.

[00114] For example, in FIG. 1 is a schematic block diagram of a terminal as a mobile phone. The mobile phone 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170V, microphone 170C, headset interface 170D, sensor module 180, key 190, motor 191, indicator 192, camera 193, display 194, and subscriber identity module (SIM) card interface 195. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, a pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a proximity sensor 180F, an optical proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 18 0M etc.

[00115] It can be understood that the structure shown in this embodiment of this application does not represent a specific limitation for mobile phone 100. In some other embodiments of this application, mobile phone 100 may include more or fewer components than shown in the figure, or some components may be combined, or some components may be separated, or a different layout of components may be used. The components shown may be implemented in hardware, software, or a combination of software and hardware.

[00116] Processor 110 may include one or more processing units. For example, processor 110 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural-network processing unit (NPU). The various processing units may be independent devices or may be integrated into one or more processors.

[00117] The controller may be the main center and command center of the mobile phone 100. The controller may generate an operation control signal based on the instruction's operation code and the time sequence signal to control instruction retrieval and execution of instructions.

[00118] Memory may also be placed within processor 110 to store instructions and data. In some embodiments, the memory in processor 110 is a cache. The memory may store an instruction or data that has just been used or is being cycled by the processor 110. If the processor 110 needs to use the instruction or data again, the instruction or data may be directly recalled from the memory. Re-access is avoided and the processor 110 wait time is shortened, thereby improving system efficiency.

[00119] In some embodiments, processor 110 may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input/output interface /output, GPIO), subscriber identity module (SIM) interface, universal serial bus (USB) interface, and/or the like.

[00120] The USB interface 130 is an interface that conforms to the USB standard or specification, and may be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like, in particular. USB interface 130 may be configured to connect to a charger to charge mobile phone 100, or may be configured to transfer data between mobile phone 100 and a peripheral device. The interface can also be configured to connect to a headset to play audio through the headset. The interface can be further configured to connect to another mobile phone, such as an augmented reality device.

[00121] It can be understood that the inter-module interface connection relationship shown in this embodiment of this application is merely a schematic description and does not constitute a limitation on the design of mobile phone 100. In some other embodiments of this application, mobile phone 100 may alternatively use various interface connection methods or a combination of multiple interface connection methods in the previous embodiment.

[00122] The charge management module 140 is configured to receive charging input from the charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, charge management module 140 may receive charging input from a wired charger using USB interface 130. In some wireless charging embodiments, the charge manager 140 may receive a wireless charging input using the wireless charging coil of the mobile phone 100. In addition to charging the battery 142, the charge manager 140 can further power the mobile phone with the power manager 141.

[00123] The module 141 of the power administration is made with the possibility of connecting to the battery 142, module 140 of charging administration and processor 110. Module 141 administration of the power supply from the battery 142 and/or input from the module of 140 of the administrator 110, internal memory 121, display 194, module 193, module 193 linen communication, module 160 wireless communication, etc. The power management module 141 can be further configured to monitor parameters such as battery capacity, battery cycles, and battery health status (leakage or impedance). In some other embodiments, power management module 141 may alternatively be located in processor 110. In some other embodiments, power management module 141 and charge management module 140 may alternatively be located in the same device.

[00124] The wireless communication function of mobile phone 100 can be implemented using antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, modem processor, baseband processor, and the like.

[00125] The mobile phone 100 can implement an audio function (eg, playing or recording music) with an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, a headset interface 170D, an application processor, and the like.

[00126] The audio module 170 is configured to convert the digital audio information to an analog audio output signal, and is configured to convert the analog input audio to a digital audio signal. Audio module 170 may be further configured to encode and decode audio signals. In some embodiments, audio module 170 may be located in processor 110, or some functional modules of audio module 170 may be located in processor 110.

[00127] Speaker 170A, also referred to as a "loudspeaker", is configured to convert an electrical audio signal into an audio signal. Mobile phone 100 can be used to listen to music or receive a call hands-free using speaker 170A.

[00128] Receiver 170B is configured to convert an electrical audio signal into an audio signal. When the mobile phone 100 answers a call or voice message, the receiver 170B can be placed near the human ear to hear the voice.

[00129] Microphone 170C is configured to convert an audio signal into an electrical signal. When making a call or sending a voice message, the user can make a sound by placing his mouth on the microphone 170C and input a sound signal into the microphone 170C. Mobile phone 100 may be provided with one or more microphones 170C. In some other embodiments, the mobile phone 100 may be provided with two microphones 170C to provide a noise canceling function in addition to collecting the audio signal. In some other embodiments, mobile phone 100 may alternatively be provided with three or more microphones 170C to provide features such as directional recording and audio source identification in addition to audio collection and noise reduction.

[00130] The headset interface 170D is configured to connect to a wired headset. The headset interface 170D may be a USB interface 130 or may be a standard 3.5 mm open mobile terminal platform (OMTP) interface or a standard cellular telecommunications industry association of the USA (CTIA) interface.

[00131] The mobile phone 100 implements a display function using a graphics processing unit (GPU), a display 194, an application processor, or the like. The GPU is an image processing microprocessor and is connected to the display 194 and the application processor. The GPU is configured to perform mathematical and geometric calculations for rendering graphics. Processor 110 may include one or more GPUs that execute a software instruction to generate or modify displayed information.

[00132] The display 194 is configured to display an image, video, and the like. Display 194 includes a display panel. The display panel may be a liquid crystal display (LCD), organic light-emitting diode (OLED), active-matrix organic light emitting diode (AMOLED), flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, quantum dot light emitting diode (QLED), etc. In some embodiments, mobile phone 100 may include one or N displays 194, where N is a positive integer greater than 1.

[00133] The mobile phone 100 may implement a photographing function using an ISP, a camera 193, a video codec, a GPU, a display 194, an application processor, and the like.

[00134] The ISP is configured to process the data returned by the camera 193. For example, during photography, when the shutter is opened, light is transmitted to the photosensitive element of the camera using a lens, the optical signal is converted into an electrical signal, and the photosensitive element of the camera transmits the electrical signal to the ISP for processing to convert the electrical signal into an image visible to the naked eye. The ISP may further optimize the algorithm for image noise, brightness, and skin tone. The ISP may further optimize parameters such as exposure and color temperature of the photographic scene. In some embodiments, the ISP may be located in chamber 193.

[00135] Camera 193 is configured to capture a still image or video. The object generates an optical image using a lens, and the optical image is projected onto a light-sensitive element. The light sensitive element can be a charge coupled device (CCD) or a phototransistor based on a complementary metal-oxide-semiconductor (CMOS) structure. The light sensing element converts the optical signal into an electrical signal and then passes the electrical signal to the ISP for conversion into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into a standard image signal in a format such as RGB or YUV. In some embodiments, mobile phone 100 may include one or N cameras 193, where N is a positive integer greater than 1.

[00136] The digital signal processor is configured to process the digital signal. In addition to processing the digital image signal, the digital signal processor may further process another digital signal. For example, when mobile phone 100 selects a frequency, the digital signal processor is configured to perform a Fourier transform of the frequency energy.

[00137] The video codec is configured to compress or decompress digital video. Mobile phone 100 may support one or more types of video codecs. Thus, the mobile phone 100 can play back or record video in a variety of coding formats such as moving picture experts group (MPEG) 1, MPEG 2, MPEG3, and MPEG4.

[00138] NPU is a neural network (neural-network, NN) computing processor. When using the structure of a biological neural network, for example, when using the transmission mode between human brain neurons, the input information is quickly processed, and self-learning can be performed continuously. Applications such as image recognition, face recognition, voice recognition, and text understanding of the mobile phone 100 can be implemented using the NPU.

[00139] The external memory interface 120 may be configured to connect to an external memory card such as a Micro SD card to realize the storage capability of the extended mobile phone 100. The external memory card communicates with the processor 110 via the external memory interface 120 to realize a data storage function. For example, a file such as music or video is stored on an external memory card.

[00140] The internal memory 121 may be configured to store computer-executable program code, the executable program code including an instruction. The processor 110 executes various functional applications and data processing of the mobile phone 100 by executing an instruction stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. The program storage area may store an operating system, an application program required by one or more functions (such as a sound reproduction function or a picture reproduction function), and the like. The data storage area may store data (such as audio data or a phone book) generated during use of the mobile phone 100. In addition, the internal memory 121 may include high-speed random access memory, and may include non-volatile memory such as one or more magnetic disk storage devices, a flash memory device, or universal flash storage (UFS).

[00141] The key 190 includes a power key, a volume key, and the like. The key 190 may be a mechanical key or a touch key. Mobile phone 100 may receive keyboard input and generate keyboard input associated with user setup or control of mobile phone 100 functions.

[00142] Motor 191 may generate a vibration prompt. The motor 191 may be configured to provide a vibrational prompt of an incoming call, or may be configured to provide vibrational touch feedback. For example, a touch operation performed in different applications (such as photography and audio playback) may correspond to different vibration feedback effects. The motor 191 may also correspond to different vibration feedback effects when applied to touch operations in different areas of the display 194. Different application scenarios (eg, time reminder, get information, alarm clock, and game) may also correspond to different vibration feedback effects. Alternatively, the vibration feedback effect on touch can be customized.

[00143] Indicator 192 may be an indicator, and may be used to indicate charging status, power change, or may be used to indicate a message, missed call, notification, or the like.

[00144] The SIM card interface 195 is configured to connect to the SIM card. The SIM card may be inserted into the SIM card interface 195 or removed from the SIM card interface 195 to contact or be separated from the mobile phone 100. The mobile phone 100 may support one or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 may support a nano SIM card, a micro SIM card, a SIM card, or the like. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The plurality of cards may be of the same type or different types. The SIM card interface 195 can also be compatible with various types of SIM cards. The SIM card interface 195 may also be compatible with an external memory card. The mobile phone 100 communicates with the network using a SIM card to perform functions such as calling and data transfer. In some embodiments, mobile phone 100 uses an eSIM card, ie an embedded SIM card. The eSIM card may be embedded in the mobile phone 100 and cannot be separated from the mobile phone 100.

[00145] Based on the communication system shown in FIG. 1, the following briefly describes the underlying technology used in this application. Specifically:

[00146] (1) First, the architecture and functions of the architecture used in this application are briefly described.

A. Non-Stand Alone (NSA) Network Architecture

[00147] The NSA network includes an E-UTRA NR Dual Connectivity (E-UTRA NR Dual Connectivity, ENDC) architecture, an E-UTRA NR Dual Connectivity (NEDC) NR architecture, and a Next Generation E-UTRA NR Dual Connectivity (NGENDC) E-UTRA NR architecture in a 5G core network. In the ENDC architecture, the eNB is used as the primary base station and all control plane signaling is forwarded by the eNB. The LTE eNB and NR gNB provide the user with a high data rate service in the form of a dual connection to increase system capacity and throughput. Fig. 3a is a schematic representation of an application scenario in an ENDC architecture. In this scenario, all control plane signaling is forwarded by the eNB and the eNB uploads the data to the gNB.

[00148] In the NEDC architecture, the gNB is used as the primary base station, and the LTE eNB and NR gNB provide the user with a high data rate service in the form of a dual connection. Fig. 3b is a schematic representation of an application scenario for the NEDC architecture. In this scenario, all control plane signaling is forwarded by the gNB and the gNB uploads the data to the eNB.

[00149] In the NGENDC architecture, all control plane signaling is forwarded to the eNB, and the LTE eNB and NR gNB provide the user with a high data rate service in the form of a dual connection. Fig. 3c is a schematic representation of an application scenario in the NEDC architecture. In this scenario, all control plane signaling is forwarded by the eNB and the eNB uploads the data to the gNB.

b. Honeycomb binding

[00150] The primary base station in each dual connection scenario is an anchor base station, a cell that is under the anchor base station and configured as a primary cell is called an anchor cell. Optionally, in the ENDC scenario, the 5G cell is used as the secondary cell. Therefore, although the primary cell is an LTE cell, the primary cell may be referred to as a 5G anchor cell.

c. 5G LTE frequency

[00151] The 5G LTE frequency refers to a frequency whose cells include a 5G anchor cell. It should be noted that the 5G LTE frequency may include one or more cells, and one or more cells includes at least one 5G anchor cell. That is, the 5G LTE frequency may include one or more 5G anchor cells, or include one or more 5G anchor cells and one or more non-5G anchor cells.

[00152] With reference to FIG. 1, the following briefly describes cell selection methods in various prior art scenarios. Specifically:

[00153] (1) Network search script

[00154] For example, in a network search scenario, the terminal may perform an energy scan at a history frequency based on a stored history frequency to determine if a cell exists at each history frequency, that is, if the frequency has some energy value, a cell exists at said frequency, or if the frequency has no energy value, there is no cell at the frequency. It should be noted that the chronological frequency is the frequency at which the terminal has previously camped or the frequency at which the terminal has previously searched or measured in the cell search or cell measurement process.

[00155] The terminal may then sort the frequencies based on the received chronological frequency energy values in ascending order, and perform a cell search based on the queue order. In this case, if the cell search performed on the first frequency of the queue succeeds, the terminal may attempt to camp on any cell on that frequency.

[00156] That is, in the process of searching for a cell network, the terminal performs sequential search based on the frequency energy value, and the terminal preferably searches for a cell on the frequency with the optimal energy scan result (i.e., the maximum energy value). If the cell search is successful, the terminal may select a cell on the frequency as the serving cell and camp on that cell.

[00157] In this scenario, if the LTE frequency energy value (that is, the frequency that does not include the 5G anchor cell frequency) is greater than the 5G LTE frequency energy value, the location of the LTE frequency in the sequence precedes the 5G LTE frequency, and if the LTE frequency is in the first position in the queue and the cell search process is completed successfully, the terminal can camp on an LTE cell at that LTE frequency. However, in reality, the 5G anchor cell can provide better service for the terminal. For example, compared to a non-5G anchor cell, a 5G anchor cell can provide a 5G service to a terminal, that is, a data rate is higher than a data rate in a non-5G anchor cell.

[00158] (2) Reselect scenario

[00159] For example, in a reselection scenario, the terminal may perform cell measurement based on a frequency configured on the network side. Specifically, after receiving the frequency measurement result, the terminal proceeds to the evaluation step, that is, it evaluates the frequency measurement result to determine whether the subsequent frequency reselection process can be performed. It should be noted that in the evaluation step, a predetermined evaluation duration is set for each frequency. Every time the terminal receives a measurement result of one frequency, the terminal starts estimating the frequency. That is, the frequency whose measurement result can be obtained first can be estimated first, and when the estimation is successful, the terminal can attempt to camp on any cell at that frequency.

[00160] Finally, in the reselection scenario, the terminal preferably performs the subsequent reselection operation on the frequency that meets the evaluation criterion and whose evaluation is completed first, that is, the terminal can camp on a cell at that frequency. Optionally, in the evaluation process, if the non-5G LTE frequency measurement result meets the evaluation criterion, and the non-5G LTE frequency evaluation is completed first, the terminal may camp on the non-5G anchor cell at the non-5G LTE frequency. Optionally, if the 5G LTE frequency evaluation is completed first in the evaluation process, but the 5G LTE frequency does not meet the evaluation criterion, the terminal can still camp on a non-5G anchor cell that is on a non-5G LTE frequency and whose evaluation is completed after the 5G LTE frequency. That is, the success or failure of the evaluation and the completion sequence of the evaluation affect the probability that the 5G anchor cell will be selected as the serving cell.

[00161] However, in fact, a 5G anchor cell can provide a better service for the terminal. For example, compared to a non-5G anchor cell, a 5G anchor cell can provide a 5G service to a terminal, that is, a data rate is higher than a data rate in a non-5G anchor cell.

[00162] (3) Handover scenario

[00163] For example, in a handover scenario, the terminal may perform cell measurement based on a frequency configured on the network side. Specifically, after receiving the frequency measurement result, the terminal proceeds to the evaluation step, that is, evaluates the frequency measurement result, to determine whether a subsequent reselection process can be performed at said frequency. As in the reselection scenario, in the evaluation phase, a predetermined evaluation duration is set for each frequency. Every time the terminal receives a frequency measurement result, the terminal starts estimating the frequency. That is, if a frequency measurement result is obtained first, frequency estimation can be completed first; and when the evaluation is successful, the terminal may report the frequency measurement result to the network side. That is, the success or failure of the evaluation and the completion sequence of the evaluation affects the probability that the 5G anchor cell will be selected as the serving cell.

[00164] In the handover scenario, if the terminal first reports the non-5G LTE frequency measurement result, the base station may first consider using the non-5G frequency anchor cell as the serving cell of the terminal and direct the terminal to handover to that cell. Obviously, if the terminal can be handed over to the 5G anchor cell, the terminal can obtain a higher data rate than in the non-5G anchor cell.

[00165] In order to solve the above problem, in this application, the terminal can optimize the frequency estimation policy (which may be referred to as the preferred frequency) to which the preferred cell belongs to increase the likelihood that the preferred cell is selected as the serving cell, thereby further improving the communication quality of the terminal.

[00166] It should be noted that in this application, only the E-UTRA NR (E-UTRA NR Dual Connectivity, ENDC) scenario, in which a 5G anchor cell is used as the preferred cell, is used as an example for description. The solution in this application can also be applied when another preferred cell is selected. For example, in the NEDC scenario, a 5G cell is used as an anchor cell and an LTE cell is used as a secondary cell. That is, the technical solution in this application is also applied to an application scenario in which a 5G cell is used as an anchor cell. It is not limited in this application scenario.

[00167] Optionally, in this application, the preferred cell is a cell of the specified type or a preset type. Optionally, in this application, the preferred cell is the 5G anchor cell, and the frequency to which the 5G anchor cell belongs may be referred to as the LTE frequency including the 5G anchor cell (abbreviated 5G LTE frequency).

[00168] Optionally, in this application, the terminal may store previous history information, and the previous history information records one or more frequency ID information and corresponding cell type information, or cell ID information and corresponding cell type information. Optionally, the cell ID information includes ID information of the frequency to which the cell belongs, ID information of the frequency band (Band), and cell ID information (i.e., cell ID) of said cell in the base station of which said cell belongs. The frequency type information is used to indicate a frequency type, and the cell type information is used to indicate a cell type. Specifically, in this application, the frequency includes the frequency of the 5G reference cell, the frequency type information of said frequency is the 5G LTE frequency, and the cell type information corresponding to the 5G reference cell ID information is the 5G reference cell. .

[00169] In an exemplary implementation, the one or more frequencies or cells recorded in the prior history information may include the cell to which the terminal camps and the frequency to which the cell belongs. Optionally, after the terminal has camped on a cell, the terminal may read system information 2 (SIB2) of that cell to obtain cell type information included in SIB2. Optionally, the terminal may record in the previous history information only the information of the 5G anchor cell type and the frequency to which the 5G anchor cell belongs, and the information of the other cell type and the frequency of the other cell type may be ignored. Optionally, after the terminal has camped on the cell, the cell can be configured as a 5G anchor cell based on the user's instruction, that is, a 5G secondary cell is added to the cell. For this cell type, the type in the previous history information is also a 5G anchor cell, and the frequency type to which the cell belongs is labeled as a 5G LTE frequency.

[00170] In an exemplary implementation, one or more frequencies or cells in the prior history information may include a cell identified during the terminal's background search process. The specific process is described in detail in the following embodiments.

[00171] In particular, in this application, the terminal can extract the previous history information based on the candidate frequency ID information and/or the candidate cell ID information to determine whether the candidate frequency is a 5G LTE frequency or whether the candidate cell is a 5G anchor cell, that is, a preferred frequency or a preferred cell in this specification. It should be noted that a candidate frequency is a frequency to be executed and can also be understood as a frequency that can be used as a candidate frequency. The terminal may select a target frequency candidate from the candidate frequencies to perform a subsequent cell search, reselection, or handover action. A candidate cell is a cell at a candidate frequency. The candidate frequency may include one or more cells. The target candidate cell is a cell at the target candidate frequency.

[00172] In particular, in this application, the terminal may optimize the preferred frequency estimation policy to increase the likelihood that a preferred cell on a preferred frequency will be selected as a serving cell. Optionally, the estimation policy includes, but is not limited to, at least one of the following: cell frequency search sequence, frequency estimation duration, cell frequency gain, or frequency priority.

[00173] Optionally, in this application, for different application scenarios, the terminal may select different evaluation policies for optimization. Next, the cell selection method in various application scenarios will be described in detail with reference to FIG. 1. In particular, for the cell selection method in the cell search scenario, refer to scenario 1; for the cell selection method in the reselection scenario, refer to scenario 2; and for the cell selection method in the handover scenario, refer to scenario 3.

[00174] For example, with reference to FIG. 1, in this application, cells A1-A3 (not shown in the figure) in base station A are LTE cells, and cells B1-B3 (not shown in the figure) in base station B are LTE cells, and B1 is a 5G anchor cell of cell D1 in base station D. Cells C1-C3 (not shown in the figure) in base station C are LTE cells, and C1 is a 5G anchor cell of cell D2 in base station D. Cells D1-D4 (not shown in the figure) in base station D are 5G cells, cell D1 being the secondary 5G cell of cell B1. Cell D2 is the secondary 5G cell of cell C1. For example, in this application, in Option mode 3, in the dual connection scenario for cell B1 and cell D1 and cell C1 and cell D2, the eNB (the base station that owns the 5G anchor cell, that is, base station C or base station B) provides the control plane connection, and the eNB uploads data to the gNB (the base station that owns the 5G cell, that is, base station D). For example, cells A1-A3 belong to frequency 1, cells B1-B2 belong to frequency 2, and cells C1-C3 belong to frequency 3.

[00175] Scenario 1

[00176] With reference to FIG. 1, fig. 4 is a flowchart example of a cell selection method. Specifically:

[00177] Step 101: The terminal performs an energy scan on at least one frequency in the previous history information.

[00178] Specifically, in this application, the terminal may retrieve the prior history information locally stored by the terminal and perform an energy scan based on one or more frequencies recorded in the prior history information to detect the presence of energy at that frequency. It should be noted that the frequency at which the energy exists can be considered as the frequency existing in the cell, and it is necessary to further determine whether the cell actually exists by cell search.

[00179] Additionally, it should be noted that in this scenario, all frequencies in the previous history information may be understood as candidate frequencies, and cells at each frequency may be referred to as candidate cells.

[00180] FIG. 5 is a specific flowchart of a method for implementing a cell selection method by a terminal. Referring to FIG. 5, the process in which the terminal performs energy scanning may specifically include the following steps:

[00181] Step 201: The RRC layer sends a scan request message to the physical layer.

[00182] In particular, after determining whether to perform a cell search, the Radio Resource Control (RRC) layer in the terminal retrieves the previous historical information locally stored in the terminal. As described above, the previous history information includes one or more frequency ID information and/or cell ID information.

[00183] The RRC layer may direct the physical layer to measure the energy values of all frequencies recorded in the previous history information, that is, to perform an energy scan at all frequencies in the previous history information.

[00184] Specifically, the RRC layer sends frequency identifier information to the physical layer to instruct the physical layer to perform energy scanning on that frequency. Optionally, the frequency identifier information may be carried in the scan request message.

[00185] Step 202: The physical layer sends a scan response message to the RRC layer.

[00186] Specifically, the physical layer performs an energy scan at the respective frequencies based on the frequency ID information specified by the RRC layer, and sends the result of the energy scan to the RRC layer.

[00187] Optionally, the physical layer performs an energy scan based on the ID information of the frequencies indicated by the RRC layer one by one, and sends the scan result of each frequency to the RRC layer after receiving the energy scan result.

[00188] Optionally, the scan result may be included in the scan response message. Optionally, the scan response message further includes, but is not limited to, frequency ID information to indicate a mapping relationship between a frequency and an energy scan result.

[00189] Optionally, the scan result includes, among other things, one or more frequency energy values and/or a cell correlation result. For example, the cell correlation result may be a Primary Synchronization Signal (PSS ratio), and the result is used to indicate the probability that a cell exists at a certain frequency. For example, the frequency energy value may be a Received Signal Strength Indication (RSSI) indication. In this application, it is expressly not limited.

[00190] Step 102: The terminal determines if the 5G LTE frequency matches the preferred condition. If necessary, this application sets a preferred condition for the terminal. In a cell search scenario, the preferred condition includes, but is not limited to, at least one of the following:

[00191] The 5G LTE frequency energy scan result is greater than or equal to the first frequency threshold (which may be set based on the actual requirement); or

the difference between the frequency energy scan result with the highest frequency energy value and the 5G LTE frequency energy scan result is less than or equal to the second frequency threshold (which can be set based on the actual requirement).

[00192] It should be noted that in this application, when the 5G LTE frequency energy scan result is greater than or equal to the first frequency threshold, or the difference between the 5G LTE frequency energy scan result and the frequency energy scan result with the largest energy value is less than or equal to the second frequency threshold, the 5G LTE frequency can be considered as a "good frequency", i.e., there is a higher probability of a cell existing at that frequency. For example, the first frequency threshold may be -90 dB (relative to RSSI) and the second frequency threshold may be 10 dB. The first frequency threshold and the second frequency threshold may be specifically set based on the actual requirement. In this application, it is expressly not limited.

[00193] That is, in this application, if the frequency energy scan result is too poor, for example, less than the first frequency threshold or has a large difference from the energy scan result of the first queue frequency, this frequency cannot be used as a target frequency candidate to participate in the subsequent cell search process.

[00194] Still referring to FIG. 5, in particular in this application, as shown in FIG. 5:

[00195] Step 203: The RRC layer determines whether the 5G LTE frequency meets the preferred condition.

[00196] Optionally, as described above, the RRC layer can determine whether the frequency is a 5G LTE frequency by extracting previous historical information based on the frequency ID information. In particular, the RRC layer may sequentially match the frequency identifier information with one or more frequencies recorded in the previous history information. If the matching is successful, the cell type corresponding to the successfully matched frequency is obtained.

[00197] In an exemplary implementation in this application, the RRC layer may search for a plurality of frequencies that satisfy the aforementioned 5G LTE frequency preference condition to determine if there is a 5G LTE frequency that satisfies the preference condition.

[00198] In another possible implementation, the RRC layer may further first determine if the 5G LTE frequency is queued and then detect if the 5G LTE frequency matches the preferred condition. Optionally, before step 101, the RRC layer may request, by extracting the frequency type information for each frequency recorded in the previous history information, whether the frequencies to be scanned include a 5G LTE frequency. For example, if the 5G LTE frequency is enabled, processing is performed in accordance with the procedure described in this application. In another example, if the 5G LTE frequency is not enabled, processing is performed in accordance with a network search procedure known in the art.

[00199] It should be noted that if the 5G LTE frequency does not exist in the queue or the 5G LTE frequency corresponding to the preferred condition does not exist in the queue, the terminal may camp on a non-5G cell on a non-5G LTE frequency and perform reselection or handover, or after a predetermined duration (which may be set based on some requirement), perform a background search operation (background search is described in the following embodiments).

[00200] Step 103: The terminal determines the cell search sequence.

[00201] Specifically, the terminal may determine the current cell search target (ie, frequency) based on the obtained energy scan result for each frequency. As described above in the prior art, the terminal performs an energy scan based on a sequence of energy scan results. That is, the cell search is preferably performed on the frequency with the largest energy scan result, and on that cell, on that frequency, it is possible to secure. Compared with the prior art, in this application, if at step 102 the terminal determines that one or more 5G LTE frequencies that meet the preferred condition are included in the frequencies whose energy scan results are obtained, at this step, the terminal can determine that the energy scan sequence of the 5G LTE frequencies that meet the above preferred condition is performed to search for a preferred cell relative to other frequencies (including 5G LTE frequencies and/or LTE frequencies that do not meet the preference condition). For example, if the terminal obtains the energy scan result for frequency 1 and frequency 2, frequency 1 is the LTE frequency, frequency 2 is the 5G LTE frequency, and the energy scan result for frequency 1 is greater than frequency 2. According to the cell search method known from the prior art, the terminal preferably searches for a cell at frequency 1, and when frequency 1 satisfies the condition, camps on an LTE cell at frequency 1, that is, a non-5G LTE anchor cell. In this application, if the energy scan result at frequency 2 meets a specific threshold (i.e., the preferred condition described in this application), the terminal preferably searches for a cell at frequency 2 and can camp on a 5G anchor cell at frequency 2.

[00202] Still referring to FIG. 5, in particular, step 103 may be performed by the RRC layer in the terminal. Specifically:

[00203] Step 204: The RRC layer determines the cell search sequence.

[00204] In particular, the RRC layer receives the scan response message sent by the physical layer and reads the frequency ID information and the corresponding energy scan result. The RRC layer may then determine the cell search sequence of said frequencies based on the obtained energy scan result for each frequency.

[00205] In an exemplary implementation, the method by which the RRC layer determines the cell search sequence may be that the RRC layer may determine the cell search queue, with the 5G LTE frequency meeting the preferred condition being at the front of the queue to preferentially perform the cell search operation on the 5G LTE frequency. Optionally, the 5G LTE frequency that meets the preferred condition can be further sorted based on the size of the energy scan result for each frequency. Optionally, other frequencies other than 5G LTE and/or 5G LTE frequencies that do not meet the preferred condition may be sorted based on the scan result of each frequency.

[00206] In another possible implementation, the terminal may determine only the object for which it is currently necessary to perform a cell search. For example, a cell search rule may be set in the terminal, and the 5G LTE frequency with the highest energy scan result among the 5G LTE frequencies satisfying the preferred condition is determined as the object on which the cell search is currently to be performed.

[00207] Step 104: The terminal performs a cell search based on the cell search sequence.

[00208] Specifically, after determining, in step 103, a frequency at which a cell search is currently to be performed, the terminal may perform a cell search on the frequency to obtain a cell search result of said frequency, the cell search result including, but not limited to, the ID information of each cell at said frequency and the corresponding cell energy measurement result.

[00209] Still referring to FIG. 5, in step 104, the process of performing a cell search by the terminal may specifically include:

[00210] Step 205: The RRC layer sends a cell search request message to the physical layer.

[00211] In particular, after determining the frequency on which cell search is currently to be performed, the RRC layer may send frequency identifier information to the physical layer to instruct the physical layer to search for the cell of that frequency.

[00212] For example, as described in step 204, if the sequencing method of the RRC layer is to determine the cell search queue, the frequency indicated by the RRC layer to the physical layer may be the frequency identifier information that is in the first position in the queue.

[00213] Step 206: The physical layer sends a cell search response message to the RRC layer.

[00214] In particular, the physical layer performs, in response to the cell search request message sent by the RRC layer, a cell search at a frequency indicated by the frequency identifier information, and obtains a cell search result for each cell at that frequency. Optionally, the cell search result includes, but is not limited to, the cell energy value for each cell at a frequency, and the cell energy value includes, but is not limited to, Reference Signal Receiving Power (RSRP), Signal to Interference plus Noise Ratio (SINR), and the like. For a specific cell search process, refer to the prior art. Details are not described in this application.

[00215] In an exemplary implementation, if at step 205 the RRC layer indicates that the frequency at which the physical layer cell search is performed is a 5G LTE frequency, at step 206 the physical layer returns a cell search result for each cell on the 5G LTE frequency. The RRC layer can further determine, based on the ID information of each cell, whether one or more cells on the 5G LTE frequency include a 5G anchor cell by extracting the ID information of one or more cells and the corresponding cell type information that is recorded in the previous history information.

[00216] Optionally, if the RRC layer determines, by extraction, that the cells whose cell search results have been obtained do not include a 5G anchor cell, the reason may be that the cell is not found in the cell search process, or there may be another reason. Optionally, in this case, the RRC layer may indicate to the physical layer to try to camp on a cell with an optimal cell search result on the frequency, or if the next frequency to be found in the cell search sequence is still a 5G LTE frequency, the RRC layer may perform a cell search on the next 5G LTE frequency based on the cell search sequence.

[00217] Optionally, if the RRC layer determines through the search that the cells whose cell search results were obtained include at least one 5G anchor cell, the RRC layer may further determine whether the 5G anchor cell satisfies the cell search condition. For example, the cell search condition may be that the cell search result of the 5G anchor cell is optimal among the cells at the same frequency, or the difference between the cell search result of the 5G anchor cell and the optimal cell search result of the cells at the same frequency is less than or equal to the first camping threshold (which may be set based on the actual requirement).

[00218] Optionally, if the PHY fails to camp on the 5G anchor cell, the RRC layer may again instruct the PHY to try camping on another 5G anchor cell that satisfies the cell search condition on the same frequency. Optionally, if there is no other 5G anchor cell on the same frequency that satisfies the cell search condition, the RRC layer may indicate to the physical layer to try to camp on another non-5G anchor cell on the same frequency. Optionally, if all cells fail to camp on said frequency, the RRC layer may repeat steps 205 and 206, ie search for a cell on the next frequency based on the cell search sequence and attempt to camp on some cell.

[00219] In another possible implementation, if at step 205 the RRC layer indicates that the frequency at which the physical layer cell search is performed is a frequency other than 5G LTE, at step 206 the physical layer returns a cell search result for each cell at a frequency other than 5G LTE. The RRC layer may instruct the physical layer to attempt to camp on a cell with an optimal cell search result on said frequency.

[00220] Further, in an exemplary implementation, if the number of frequencies recorded in the prior history information is less than or equal to a threshold number, the RRC layer may not perform the energy scanning process (i.e., step 201 and step 202) on the frequencies recorded in the prior history information, and the RRC layer may detect whether the frequencies in the prior history information include the 5G LTE frequency. Optionally, if the RRC layer detects that the frequencies in the previous history information do not include the 5G LTE frequency, the RRC layer may perform a cell search based on the sequence of frequencies recorded in the previous history information. That is, in this embodiment, the cell search sequence determined by the RRC level is the frequency arrangement sequence in the previous history information. Optionally, if the RRC layer detects that the frequencies in the previous history information include at least one 5G LTE frequency, the RRC layer preferably performs a cell search on the 5G LTE frequencies based on the cell search sequence determined by the RRC layer.

[00221] Finally, in the cell search scenario, the RRC layer can adjust the sequence of 5G LTE frequencies that satisfy the preferred condition to preferentially perform the cell search operation on the 5G LTE frequencies, thereby increasing the likelihood that a 5G anchor cell that may exist on the 5G LTE frequency serves as a serving cell.

[00222] With reference to FIG. 1 based on the embodiments shown in FIG. 4 and FIG. 5, fig. 6 is a flowchart example of a cell selection method. In FIG. 6:

[00223] Step 301: The RRC layer sends a scan request message to the physical layer.

[00224] Specifically, as described above, the prior history information includes frequency information (including ID information and frequency type information) and cell information (including cell ID information and cell type information) for at least one frequency. It should be noted that the cell ID may indicate the frequency to which the cell belongs.

[00225] In this application, the terminal must first perform an energy scan at said frequency. Accordingly, the RRC layer can obtain, by extracting the previous history information, the identifier information of each frequency recorded in the previous history information, and instruct the physical layer to perform an energy scan on each frequency.

[00226] For example, in this embodiment, the prior historical information is shown in Table 1.

Table 1

Frequency Frequency Type Information Cells on frequency Cell type information Frequency 1 LTE frequency Honeycomb A1 LTE cell Honeycomb A2 LTE cell Honeycomb A3 LTE cell Frequency 2 5G LTE frequency Honeycomb B1 cell binding 5G Honeycomb B2 LTE cell Honeycomb B3 LTE cell Frequency 3 5G LTE frequency Honeycomb C1 cell binding 5G Honeycomb C2 LTE cell Honeycomb C3 LTE cell

[00227] It should be noted that the preceding historical information shown in Table 1 is only an example. The previous history information actually records the ID information of each frequency and each cell. In Table 1. For example, "frequency 1" can be understood as frequency identifier information 1; similarly, "cell A1" can be understood as cell ID information of A1. In an actual application, the cell ID information includes a combination of frequency, bandwidth, and cell ID.

[00228] This application does not impose restrictions on the method of recording the correspondence between parameters in the prior historical information and the method of identifying the parameters.

[00229] Specifically, the RRC layer retrieves the previous history information and obtains identifier information (i.e., "frequency 1") that includes frequency 1, identifier information (i.e., "frequency 2") that includes frequency 2, and identifier information (i.e., "frequency 3") that includes frequency 3.

[00230] The RRC layer sends a scan request message to the physical layer, where the scan request message contains a frequency 1, a frequency 2, and a frequency 3.

[00231] For other specific details, see step 201. Details are not repeated here.

[00232] Step 302: The physical layer sends a scan response message to the RRC layer.

[00233] Specifically, in response to receiving the ID information of each frequency, the physical layer performs an energy scanning operation at each frequency.

[00234] For example, in this embodiment, the physical layer detects the presence of an energy value at each frequency and returns the energy value to the RRC layer, with the energy value (eg, RSSI) of each frequency carried in the scan response message.

[00235] For other specific details, refer to step 202. Details are not repeated here.

[00236] Step 303: The RRC layer sorts the energy scan results of all frequencies.

[00237] For example, the RRC layer sorts the RSSI values of all frequencies in descending order, and the sort result is as follows:

[00238] Frequency 1, frequency 3 and frequency 2.

[00239] For other specific details, see step 204. Details are not repeated here.

[00240] Step 304: The RRC layer determines if the 5G LTE frequency meets the preferred condition.

[00241] For example, based on the ID information of each frequency, the RRC layer determines that frequency 2 and frequency 3 are 5G LTE frequencies by extracting the previous information.

[00242] In addition, the RRC layer detects whether the RSSI values of frequency 2 and frequency 3 are greater than or equal to the RSSI threshold (which may be set based on the actual requirement).

[00243] For example, in this embodiment, the RSSI value for frequency 3 is greater than the RSSI threshold, and the RSSI value for frequency 2 is less than the RSSI threshold. That is, frequency 3 is the 5G LTE frequency that meets the preferred condition, and frequency 2 is the 5G LTE frequency that does not meet the preferred condition.

[00244] For other specific details, see step 203. Details are not repeated here.

[00245] Step 305: The RRC layer adjusts frequency 3 to the first position in the queue.

[00246] For example, the configured queue sequence is as follows: frequency 3, frequency 1, and frequency 2.

[00247] For other specific details, see step 204. Details are not repeated here.

[00248] Step 306: The RRC layer sends a cell search request message to the physical layer.

[00249] For example, the RRC layer sends frequency ID information (i.e. frequency 3) in the first queue position to the physical layer to instruct the physical layer to perform a cell search operation on frequency 3. Frequency ID 3 information is carried in the cell search request message.

[00250] For other specific details, see step 205. Details are not repeated here.

[00251] Step 307: The physical layer sends a cell search response message to the RRC layer.

[00252] For example, the physical layer performs a cell search operation at frequency 3. The specific cell search process includes, but is not limited to: The physical layer reads the system message of each cell at frequency 3, parses the system message, and the like. See the prior art for specific details. Details are not described in this application again.

[00253] For example, the physical layer returns the cell search result of frequency 3 to the RRC layer, and the cell search result is included in the cell search response message.

[00254] For example, in this embodiment, the cell search response message may carry the identifier information of each of the cells C1-C3 and the corresponding energy values. After receiving the cell search response message, the RRC layer determines, based on the ID information of each cell, that cell C1 is a 5G anchor cell by extracting the previous historical information.

[00255] Optionally, the RRC layer may further determine if cell C1 satisfies the following conditions:

(1) Cell C1 is the cell with the highest energy value at the same frequency.

(2) The difference between the energy value of the cell with the maximum energy value and the energy value of the C1 cell is less than or equal to the first anchoring threshold.

[00256] If any of the above conditions are met, the RRC layer may indicate to the physical layer to try to camp in cell C1. Conversely, if cell C1 does not satisfy the above condition, the RRC layer may indicate to the physical layer to try to camp in the cell with the maximum energy value in cell C1 and cell C2. That is, when the energy value of the 5G anchor cell is the maximum value, the terminal can camp on the 5G anchor cell. When the energy value of the 5G anchor cell is not the maximum value, if the terminal is expected to camp on the 5G anchor cell considering the co-channel interference between the 5G anchor cell and the cell with the maximum energy value, the 5G anchor cell can be used as a serving cell only when the difference between the energy value of the 5G anchor cell and the energy value of the cell with the maximum energy value is less than the first camping threshold. Optionally, if the cell energy value includes RSRP, the first anchoring threshold may be 3 dB; and/or if the cell energy value includes SINR, the first anchoring threshold may be 3 dB or 5 dB. This can be specifically set based on the actual requirement, and is not limited in this application.

[00257] Scenario 2

[00258] With reference to FIG. 1, fig. 7 shows an example flowchart of the cell selection method. Specifically:

[00259] Step 401: The terminal receives at least one frequency identifier information sent by the network side.

[00260] Specifically, after camping on the current serving cell, the terminal may perform cell reselection while the terminal is in the idle state.

[00261] Specifically, the network side periodically sends a system message, the system message including, among other things, at least one frequency identifier information (which may also be referred to as a neighbor cell frequency), each frequency priority information, a measurement threshold, and a reselection threshold.

[00262] Specifically, in this application, the RRC layer in the terminal may parse the system message from the network side after the terminal has camped in the current serving cell to obtain the ID information of each frequency configured on the network side, the priority information of each frequency, the measurement threshold, the reselect threshold, and the like, which are included in the system message.

[00263] It should be noted that the timer may be set at the RRC level. After the timer expires, the RRC layer re-parses the system message from the network side. For example, a system message from the network side may be updated. When the RRC layer timer expires, parameters such as identifier information and priority information, which are related to each frequency and which are carried in a new system message, are obtained by parsing the new system message from the network side.

[00264] In particular, according to the protocol, in the process in which the terminal performs the frequency measurement, it is necessary to measure the frequency with a high priority. The same priority frequency and the low priority frequency are measured only when the quality of service of the currently busy serving cell is less than the measurement threshold. That is, frequency by same priority or low priority threshold is measured only when the quality of service of the serving cell is less than the measurement threshold. It should be noted that one or more frequencies configured on the network side are candidate frequencies described in this application. It should be noted that the quality of service of a cell includes, but is not limited to, the RSRP and/or SINR of the cell.

[00265] Further, it should be noted that a high priority frequency means that the frequency priority is higher than the frequency priority to which the serving cell belongs, a frequency with the same priority means that the frequency priority is the same as the frequency priority to which the serving cell belongs, and a low priority frequency means that the frequency priority is lower than the priority of the frequency to which the serving cell belongs.

[00266] Step 402: The terminal determines whether the 5G LTE frequency is included in at least one frequency configured on the network side.

[00267] Specifically, after the terminal parses and obtains the frequency identifier information in the system message, the terminal matches at least one frequency in the previous history information with the identifier information of each frequency, and obtains the type information corresponding to the associated frequency to determine whether the frequencies configured on the network side include the 5G LTE frequency. It should be noted that if the frequency configured on the network side does not match the previous history information, that is, the frequency configured on the network side is not recorded in the previous history information, if necessary, the frequency can be used as the default LTE frequency. Optionally, if the frequency is actually a 5G LTE frequency, the terminal can camp on the 5G anchor cell at the 5G LTE frequency and determine, after reading system message 2 (system message 2 carries cell type) of frequency, that the cell on which camping is performed is a 5G anchor cell, and that the frequency to which the cell belongs is the 5G LTE frequency, the RRC layer can update the previous history information and record the cell, frequency to which the cell belongs, and types corresponding to cell and frequency to the previous historical information. Optionally, if the terminal does not camp in said cell, but camps in an LTE cell on an LTE frequency other than 5G, the terminal can obtain, by performing a background search, type information related to the 5G anchor cell and the frequency of the 5G anchor cell, and accordingly write the type information to the previous history information. The specific background search process is described in detail in the following embodiments, and details are not described here.

[00268] Optionally, if the terminal determines that the 5G LTE frequency is included in the frequencies configured on the network side, the terminal may execute step 403, that is, optimize the 5G LTE frequency measurement condition. It can also be understood that in this application, after the terminal determines based on the previous history information that the 5G LTE frequency is included in the frequencies configured on the network side, it is determined that the 5G LTE frequency needs to be measured. To ensure that the 5G LTE frequency meets the measurement requirement, the terminal may optimize the 5G LTE frequency measurement condition or modify the terminal's measurement policy so that the terminal can measure the 5G LTE frequency. It should be noted that in the prior art, if the 5G LTE frequency does not meet the measurement requirement or the measurement criterion, the 5G LTE frequency is not measured in the prior art, that is, the terminal is not secured to the 5G LTE frequency. In this application, by optimizing the 5G LTE frequency measurement condition, the subsequent cell measurement process can also be performed at a 5G LTE frequency that does not meet the measurement condition, thereby increasing the likelihood that the terminal will camp on the 5G anchor cell at the 5G LTE frequency.

[00269] Optionally, if the terminal determines that the 5G LTE frequency is not included in the frequencies configured on the network side, step 404 is executed to start the frequency measurement. This should also be understood in the same way as the prior art.

[00270] FIG. 8 is a flowchart of a method for selecting a cell within a terminal in a reselection scenario. Referring to FIG. 8, in particular:

[00271] Step 501: The RRC layer determines whether the 5G LTE frequency is included in at least one frequency configured on the network side.

[00272] Specifically, in this application, the RRC layer can determine, based on the frequency ID information, whether the 5G LTE frequency is included in at least one frequency configured on the network side by extracting the frequency type information for each frequency recorded in the previous history information.

[00273] If yes, step 502 is performed. If not, step 503 is performed. That is, if the 5G LTE frequency is not included in the frequencies configured on the network side, the terminal can camp on a non-5G anchor cell after reselection. In this case, the terminal re-executes step 401 or searches in the background after docking for a preset duration.

[00274] Step 403: The terminal determines a 5G LTE frequency measurement condition.

[00275] Optionally, in this application, after determining that one or more 5G LTE frequencies are included in the frequencies configured on the network side, the terminal can optimize the 5G LTE frequency measurement condition. That is, for a 5G LTE frequency that does not meet the measurement criterion, the terminal can optimize the 5G LTE frequency measurement condition so that the 5G LTE frequency meets the measurement criterion, thereby increasing the probability that the 5G LTE frequency is selected as a serving cell.

[00276] Specifically, in this application, the 5G LTE frequency measurement condition determination process may be performed by the RRC layer in the terminal. Still referring to FIG. 8, in particular:

[00277] Step 502: The RRC layer determines the 5G LTE frequency measurement conditions.

[00278] Specifically, in this application, the RRC layer measures the quality of service of a currently camped serving cell in real time. For a specific measurement process, refer to the prior art. Details are not described in this application again.

[00279] Optionally, if the quality of service of the serving cell is higher than the measurement threshold configured on the network side, the terminal performs cell measurement only on the high priority frequency that is configured on the network side. In this scenario, if there is a 5G LTE frequency with the same or low priority, the RRC layer can optimize the 5G LTE frequency measurement conditions to increase the probability that the 5G LTE frequency is selected as the serving cell. .

[00280] Additionally, the RRC layer may optimize the 5G LTE frequency measurement conditions by one of the following optimization methods:

(1) Increase 5G LTE frequency priority. For the low priority 5G LTE frequency, the 5G LTE frequency priority can be increased so that the 5G LTE frequency priority is higher than the frequency priority of the serving cell, that is, the 5G LTE frequency becomes a high priority frequency. For example, if the quality of service of the serving cell is higher than the measurement threshold, the terminal only measures the frequency which is configured on the network side and whose priority is higher than that of the serving cell. It is assumed that the 5G LTE frequency priority configured on the network side is 5, and the serving cell threshold is 4 (a lower priority value indicates a higher priority), that is, the serving cell priority is higher than the 5G LTE frequency priority, and the 5G LTE frequency is a low priority frequency. In this case, the RRC layer can increase the 5G LTE frequency priority. For example, the 5G LTE frequency priority is set to 3, so that the 5G LTE frequency priority is higher than the serving cell's frequency priority, and the 5G LTE frequency can participate in the subsequent reselection process.

(2) Modification of the measurement threshold. For example, the threshold is increased. The RRC layer may increase the measurement threshold so that the quality of service of the serving cell is below the measurement threshold to initiate frequency measurement with the same priority and low priority.

[00281] In an exemplary implementation, after determining the 5G LTE frequency in step 402, the terminal may also perform step 404. That is, after determining that a 5G LTE frequency exists, the terminal may measure the frequencies (which may include the 5G LTE frequency) and the 5G LTE frequency that satisfy the measurement requirement.

[00282] Step 404: The terminal performs a cell measurement on each frequency configured on the network side.

[00283] In particular, the terminal can perform a cell measurement on a frequency that is tuned on the network side and which meets the measurement criterion, that is, a cell measurement on a frequency, to obtain a frequency measurement result, the frequency measurement result including a cell measurement result of at least one cell on said frequency. Optionally, the cell measurement result may include, but is not limited to: RSRP, SINR, and/or the like. In this application, it is expressly not limited.

[00284] Still referring to FIG. 8, step 404 may specifically include:

[00285] Step 503: The RRC layer sends a measurement request message to the physical layer.

[00286] Specifically, the RRC layer sends a measurement request message to the physical layer, the message carrying one or more frequency identifier information.

[00287] Optionally, the identifier information related to one or more frequencies and indicated by the RRC layer for the physical layer may include identification information of at least one 5G LTE frequency.

[00288] Step 504: The physical layer sends a measurement confirmation message to the RRC layer.

[00289] In particular, after receiving the measurement request message sent by the RRC layer, the physical layer sends a measurement response message to the RRC layer to indicate that the request has been successfully received and the corresponding configuration has been completed.

[00290] Step 505: The physical layer sends a measurement response message to the RRC layer.

[00291] In particular, in response to one or more frequencies sent by the RRC layer, the physical layer performs a cell measurement on one or more frequencies and obtains a frequency measurement result for each frequency.

[00292] Optionally, after receiving a measurement result of any frequency (including a cell measurement result for each cell on a frequency), the physical layer sends a frequency measurement result of said frequency to the RRC layer, including, but not limited to, frequency ID information, each cell ID information on said frequency, and the corresponding cell measurement result. It should be noted that after receiving the measurement result of one frequency, the physical layer can send the frequency measurement result to the RRC layer. Optionally, the frequency measurement result of said frequency may be carried in the measurement response message.

[00293] For other specific details on cell measurement, see the prior art. Details are not described in this application again.

[00294] Optionally, in steps 501-503, the RRC layer may determine if the 5G LTE frequency is included in the frequencies indicated for measurement by the physical layer. Optionally, if the 5G LTE frequencies indicated by the RRC layer to be measured by the physical layer include the 5G LTE frequency, after receiving the measurement result sent by the physical layer, step 506 is executed. Optionally, if the 5G LTE frequencies indicated by the RRC layer to be measured by the physical layer do not include the 5G LTE frequency, step 508 is executed, that is, the reselection method known from the prior art is still used.

[00295] Step 405: The terminal determines whether the cell measurement result of a certain 5G anchor cell on the 5G LTE frequency meets the preferred condition.

[00296] In particular, as shown at 506 in FIG. 8, in particular, this step is performed by the RRC layer. Specifically, after receiving the measurement response message sent by the physical layer, the RRC layer obtains the frequency ID information carried in the measurement response message, the cell ID information on the frequency, and the corresponding cell measurement result.

[00297] Optionally, the RRC layer may determine whether the frequency is a 5G LTE frequency by extracting previous history information based on the received frequency identifier information. Optionally, if the frequency is not a 5G LTE frequency, step 508 is performed. Optionally, if the frequency is a 5G LTE frequency, it is further determined if the 5G LTE frequency meets the preferred condition.

[00298] In particular, in this application, the RRC layer determines whether the 5G anchor cell on the 5G LTE frequency meets the preferred condition; and if the 5G anchor cell on the 5G LTE frequency meets the preferred condition, step 507 is performed; or if the 5G anchor cell on the 5G LTE frequency does not meet the preferred condition, step 508 is executed.

[00299] Optionally, the preferred condition may include, but is not limited to, at least one of the following:

[00300] 5G The measurement result of the anchor cell is greater than or equal to the third frequency threshold (which may be set based on the actual requirement); or

when the measurement result of the 5G anchor cell is less than the measurement result of the serving cell, the difference between the measurement result of the serving cell and the measurement result of the cell of said 5G anchor cell is less than or equal to the fourth frequency threshold (which may be set based on the actual requirement).

[00301] It should be noted that the purpose of the preferred condition is to detect whether the 5G anchor cell can be used as a serving cell, that is, whether the 5G anchor cell is a good cell. Optionally, in this application, the definition of a "good cell" is that the RSRP value is greater than -90 dB and/or the SINR value is greater than 10 dB. Therefore, the third frequency threshold may be that the RSRP value is greater than -90 dB and/or the SINR value is greater than 10 dB. Optionally, in this application, a cell whose measurement is less than the measurement of the serving cell and the difference between the measurement and the measurement of the serving cell (i.e., quality of service) is less than or equal to the fourth frequency threshold may be used as a "good cell"; that is, even if the measurement result of the serving cell is less than or equal to the cell measurement result of the 5G anchor cell, less than or equal to the fourth frequency threshold, the 5G anchor cell can still be regarded as a "good cell". For example, the fourth frequency threshold may be 5 dB (including RSRP and/or SINR).

[00302] Step 406: The terminal determines a 5G anchor cell evaluation policy that matches the preferred condition.

[00303] In particular, after determining that the 5G LTE frequency meets the preferred condition, the terminal can optimize the 5G LTE frequency estimation policy that meets the preferred condition to increase the likelihood that a 5G LTE anchor cell that meets the preferred condition is selected as a serving cell. It should be noted that in this application, the terminal may obtain cell measurements for cells on one or more frequencies. The evaluation policy optimization described in this application is to optimize a 5G anchor cell that is at a certain frequency and for which a cell measurement result has been obtained. In addition, in this application, the optimization of the 5G LTE frequency estimation policy is to optimize the estimation policy of the 5G anchor cell that is on the 5G LTE frequency and for which the cell measurement result has been obtained.

[00304] In particular, as shown at step 507 in FIG. 8, the RRC layer in the terminal determines the 5G anchor cell evaluation policy that satisfies the preferred condition. Optionally, evaluation policy optimization techniques include:

(1) Reducing the duration of 5G LTE frequency estimation. Specifically, the system message on the network side further carries an evaluation duration, that is, a duration set for evaluation after the RRC layer receives the frequency measurement result. Upon receipt of the measurement response message, the RRC layer shall estimate the frequency carried in the measurement response message. For example, the evaluation duration may be 300 ms. The RRC level evaluates the frequency within the evaluation duration. After the evaluation duration ends and the frequency measurement result meets the evaluation criterion, a subsequent reselection procedure is performed. In this application, by shortening the duration of 5G LTE frequency estimation, the RRC layer can preferably perform 5G LTE cell reselection, thereby increasing the probability that a 5G LTE anchor cell will be selected as a serving cell. Optionally, in step 506, the estimation duration of the frequency corresponding to the 5G anchor cell that satisfies the preferred condition can be set to the first estimation duration, and the estimation duration of the 5G LTE frequency or non-5G LTE frequency that corresponds to the 5G anchor cell that does not meet the preferred condition can be set to the second estimation duration (i.e., the estimation duration configured on the network side), the first estimation duration being less than the second estimation duration. For example, if the second evaluation duration is 300 ms, the first evaluation duration may be 100 ms. That is, in this embodiment, both the first evaluation duration and the second evaluation duration are fixed values. Optionally, the RRC layer may alternatively dynamically set the 5G LTE frequency estimation duration that corresponds to the preferred condition. For example, if the measurement result currently received by the RRC layer is a frequency other than 5G LTE, and the corresponding estimation duration is the first estimation duration (300ms), and the RRC layer receives the measurement result of the 5G LTE frequency after an interval of 20ms, the RRC layer can increase the 5G LTE frequency estimation duration by at least 20ms, for example, increase the 5G LTE frequency estimation duration by 30ms, that is, the 5G LTE frequency estimation duration can be 29 0 ms. For example, if the RRC layer receives a 5G LTE frequency measurement result after a 20ms interval, and the 5G LTE frequency measurement result is larger than the 5G LTE previous frequency measurement result, the RRC layer may further increase the 5G LTE frequency estimation duration so that the 5G LTE frequency estimation duration is shorter than the 5G LTE previous frequency estimation duration, for example, increase the 5G LTE frequency estimation duration to 100ms (relative to the estimation duration configured on the network side), that is, the estimation duration is 100 ms. It should be noted that shortening the duration of the 5G LTE frequency means shortening the evaluation duration of the 5G anchor cell on the 5G LTE frequency.

(2) Increase 5G LTE frequency priority. In particular, in this application, the reselection thresholds configured on the network side include, but are not limited to, a high priority threshold and a low priority threshold. The high priority threshold is set for the high priority frequency, and the low priority threshold is set for the low priority frequency. For example, if the difference between the gain of the frequency to which the serving cell belongs and the gain of the high priority frequency is greater than or equal to the high priority threshold, it can be determined that said frequency meets the evaluation criterion. For example, if the difference between the gain of the frequency to which the serving cell belongs and the gain of the low priority frequency is greater than or equal to the low priority threshold, it can be determined that the frequency meets the evaluation criterion. The high priority threshold is lower than the low priority threshold, i.e. the high priority frequency is more likely to meet the evaluation criterion. Therefore, in this application, the RRC layer may increase the priority of a low priority frequency to convert that frequency to a high priority frequency to increase the likelihood that the frequency meets the evaluation criterion. Optionally, the priority increase process may alternatively be performed during step 508. That is, when the RRC layer predicts during the evaluation process that the 5G LTE frequency may not meet the evaluation criterion, the gain and/or priority may be increased to increase the likelihood that the 5G LTE frequency meets the evaluation criterion. In addition, if the RRC layer predicts that the 5G LTE frequency can meet the evaluation criterion, there is no need to perform the gain and priority optimization process. It should be noted that the high priority threshold and the low priority threshold include, but are not limited to, the RSRP threshold and/or the SINR threshold. For details, reference can be made to the prior art. In this application, it is expressly not limited. It should be noted that 5G LTE frequency priority can also be understood as 5G anchor cell priority. Therefore, in this application, an increase in the priority of the 5G LTE frequency can also be understood as an increase in the priority of the 5G anchor cell.

(3) Increase the gain of the 5G anchor cell. It should be noted that during the determination process in step 506, when the 5G anchor cell satisfies the preference condition in step 506, the gain of the 5G anchor cell may still be below the reselection threshold configured on the network side. Accordingly, the RRC layer can increase the gain of the 5G anchor cell so that the 5G anchor cell meets the reselection threshold, thereby increasing the probability that the 5G anchor cell will be selected as a serving cell. It should be noted that the increased gain of the 5G anchor cell needs to be controlled within the preset range, for example, the preset range is 1-5dB, that is, the maximum RSRP value of 5dB is increased. Optionally, a gain increase optimization technique may be performed during step 508. This application is not expressly limited.

[00305] Optionally, the RRC layer may optimize the 5G LTE frequency estimation policy with any one or more of the above optimization techniques. Optionally, since reducing the evaluation duration more significantly increases the likelihood that the 5G LTE frequency will be selected as the target candidate frequency, the RRC layer may preferentially select a method for reducing the evaluation duration and combine it with any one or more other optimization methods for optimization.

[00306] Step 407: The terminal evaluates the frequency measurement result.

[00307] Optionally, in this application, after the terminal receives the frequency measurement result for any frequency and determines that the frequency is not a 5G LTE frequency that satisfies the preferred condition, the terminal can evaluate the frequency measurement result, that is, the obtained cell measurement result of each cell at that frequency during the evaluation duration (configured on the network side) corresponding to the frequency, to determine whether each cell meets the evaluation criterion. It should be noted that if any cell on a frequency meets the evaluation criterion, the frequency can also be considered to meet the evaluation criterion, that is, the evaluation was successful; otherwise, if none of the cells on the frequency meet the evaluation criterion, the frequency can be considered not to meet the evaluation criterion, that is, the evaluation is not successful.

[00308] Optionally, if the frequency received by the terminal is a 5G LTE frequency that meets the preferred condition, i.e., the 5G anchor cell of the 5G LTE frequency meets the preferred condition, and the terminal completes 5G anchor cell estimation policy optimization of the 5G LTE frequency, the terminal may evaluate the obtained cell measurement result for each cell of the 5G LTE frequency within the optimized estimation duration corresponding to the 5G LTE frequency.

[00309] Optionally, the evaluation criterion may be whether a cell is included in a frequency, whether a measurement result of any cell in a frequency meets a reselection threshold, or the like. For specific details of the evaluation, see the prior art. The details are not repeated here.

[00310] In particular, in this application, this step may be performed by the RRC layer in the terminal, as shown at step 508 in FIG. 8.

[00311] It should be noted that during the evaluation process, the RRC layer can simultaneously evaluate cell measurements for cells on a plurality of frequencies. However, the terminal may receive frequency measurement results of said frequencies at different times, and/or the frequency estimation duration may also be different, i.e., the terminal may estimate frequencies at different times and the frequency estimation duration may not be the same, and, therefore, the final frequency estimation times may also be different. Upon completion of the evaluation at any frequency (which means the end of the evaluation duration and the fulfillment of the evaluation criteria), the RRC layer may perform a subsequent reselection operation at the frequency, i.e., execute step 408.

[00312] Step 408: The terminal performs an estimated cell reselection operation.

[00313] In particular, after evaluating any frequency (in particular, a cell measurement result for a cell at said frequency), the terminal may attempt to camp on a cell at a frequency that meets the evaluation criterion, i.e., meets the reselection threshold. Optionally, if the terminal fails to camp on any cell on a frequency, the terminal may re-execute step 408, i.e., perform a reselect operation on the next estimated frequency and attempt to camp on any cell on the next estimated frequency.

[00314] Refer to FIG. 8. Specifically:

[00315] Step 509: The RRC layer sends a reselect request message to the physical layer.

[00316] In particular, after evaluating any frequency, the RRC layer in the terminal may perform a subsequent cell reselection process on that frequency.

[00317] In an exemplary implementation, if the RRC determines by extracting prior history information that the current estimation is complete, or if the estimated frequency is a 5G LTE frequency, the RRC layer may further determine a 5G anchor cell on the 5G LTE frequency by extracting prior historical information based on each 5G LTE frequency cell ID information and sending a reselect request message to the physical layer, the message may carry 5G anchor cell ID information to indicate the physical layer to perform subsequent 5G anchor cell reselection. An exemplary reselection process performed by the physical layer includes, among other things, parsing a 5G anchor cell system message and attempting to camp on the 5G anchor cell.

[00318] In another exemplary implementation, if the RRC determines by extracting prior historical information that the current estimation is complete or that the estimated frequency is a frequency other than 5G LTE, the RRC layer sends a reselection request message to the physical layer, where the message may carry cell ID information on the frequency to instruct the physical layer to perform a subsequent reselection process for the cell. An exemplary reselection process performed by the physical layer includes, but is not limited to: parsing a cell's system message and attempting to camp on the cell. Optionally, the cell to camp on may be a cell with an optimal cell measurement result at the same frequency.

[00319] Step 510: The physical layer sends a reselection response message to the RRC layer.

[00320] In particular, after determining that the terminal has successfully camped in the selected serving cell, the physical layer sends a reselection response message to the RRC layer. Optionally, if the sticky failed, the physical layer may return a sticky failure message to the RRC layer and wait for the next time the RRC layer indicates the frequency of the sticky attempt.

[00321] In an exemplary implementation, if the terminal does not reselect another cell, i.e., the terminal is still camped on the current serving cell, the terminal may re-execute steps 509 to 510, i.e., re-execute the re-select step until the timer expires; and after receiving a new system message through parsing, the terminal may perform a reselection operation at a frequency configured in the new system message or before reselecting a new serving cell.

[00322] Finally, before the measurement, the RRC layer may optimize the 5G LTE frequency measurement condition to increase the probability that a 5G anchor cell that may exist at the 5G LTE frequency will be selected as a serving cell. In addition, the RRC layer can further increase the likelihood that a 5G anchor cell will be selected as a serving cell by optimizing the 5G anchor cell evaluation policy at the 5G LTE frequency.

[00323] With reference to FIG. 1 based on the embodiments shown in FIG. 7 and FIG. 8, fig. 9A-FIG. 9B is an example flowchart of the cell selection method. In FIG. 9A-Fig. 9B:

[00324] Step 601: The RRC layer obtains the identity information of the plurality of frequencies configured on the network side and the corresponding priorities.

[00325] For example, in this embodiment, the frequencies configured on the network side for the terminal include frequency 1, frequency 2, and frequency 3. The RRC layer obtains frequency ID 1 information, frequency 1 priority 1, frequency ID 2 information, frequency 2 priority 2, frequency ID 3 information, frequency 3 priority 3, measurement threshold, reselection threshold, and evaluation duration (300 ms) which are configured on the network side.

[00326] Step 602: The RRC layer determines whether the 5G LTE frequency is included in the plurality of frequencies configured on the network side.

[00327] For example, in this embodiment, the RRC layer determines that frequency 2 and frequency 3 are 5G LTE frequencies.

[00328] See Scenario 1 for further details. Details are not repeated here.

[00329] Step 603: The RRC layer determines the 5G LTE frequency measurement conditions.

[00330] For example, in this application, frequency 2 is a high priority frequency (see the previous description for the concept) and frequency 3 is a low priority frequency.

[00331] For example, in this embodiment, the quality of service of the serving cell is above the measurement threshold, that is, the terminal only performs measurement on a high priority frequency.

[00332] For example, in this embodiment, the RRC layer may improve frequency priority 3 so that frequency priority 3 is higher than the priority of the frequency currently assigned, that is, optimize frequency 3 for a high priority cell.

[00333] Step 604: The RRC layer sends a measurement request message to the physical layer.

[00334] For example, in this embodiment, the RRC layer sends a measurement request message to the physical layer when determining that frequency 1, frequency 2, and frequency 3 satisfy the measurement condition, that is, all cells are high priority cells, and the message includes, but is not limited to, frequency ID information 1, frequency ID information 2, and frequency ID information 3.

[00335] Step 605: The physical layer sends a measurement confirmation message to the RRC layer.

[00336] Step 606: The physical layer sends a measurement response message to the RRC layer.

[00337] For example, the physical layer measures a cell at each frequency in response to a measurement request message sent by the RRC layer.

[00338] In particular, the physical layer obtains a frequency measurement result for frequency 1, including the measurement result of each of the cells A1-A3. The physical layer sends a measurement response message 1 to the RRC layer, the message including: frequency ID information 1, cell ID information A1 at frequency 1, and a cell measurement result corresponding to cell A1; cell ID information of A2 at frequency 1 and a cell measurement result corresponding to cell A2; and cell ID information of A3 at frequency 1, and a cell measurement result corresponding to the cell of A3.

[00339] Then, the physical layer obtains the frequency measurement result for frequency 2, including the measurement result of each of the cells B1-B3. The physical layer sends a measurement response message 2 to the RRC layer, the message including: frequency ID information 2, cell ID information B1 at frequency 2, and a cell measurement result corresponding to cell B1; cell ID information of B2 at frequency 2 and a cell measurement result corresponding to cell B2; and cell ID information of B3 at frequency 2, and a cell measurement result corresponding to cell B3.

[00340] Then, the physical layer obtains the frequency measurement result for frequency 3, including the measurement result of each of cells C1-C3. The physical layer sends a measurement response message 3 to the RRC layer, the message including: frequency ID information 3, cell ID information C1 at frequency 3, and a cell measurement result corresponding to cell C1; cell ID information C2 at frequency 3 and a cell measurement result corresponding to cell C2; and cell ID information C3 at frequency 3, and a cell measurement result corresponding to cell C3.

[00341] Step 607: The RRC layer determines whether the frequency corresponding to the obtained measurement result is a 5G LTE frequency.

[00342] For example, the RRC layer receives the measurement response message 1 sent by the physical layer, and obtains identifier information and other information that is related to frequency 1 and carried in the measurement response message 1. If the RRC layer determines by extracting the previous history information based on the frequency identifier information 1 that frequency 1 is not a 5G LTE frequency, step 609 is performed.

[00343] For example, if the PHY receives a frequency measurement for frequency 1 and receives a frequency measurement for frequency 2 after a 20 ms interval, the PHY sends the frequency measurement for frequency 2 to the RRC layer. Accordingly, after receiving the frequency measurement result (i.e., measurement response message 1) for frequency 1, after an interval of 20 ms, the RRC layer receives the measurement response message 2 sent by the physical layer, and obtains the identifier information and other information related to frequency 2 carried in the measurement response message 2. If the RRC layer determines by extracting previous history information based on the frequency ID information 2 that frequency 2 is not a 5G LTE frequency, step 608 is executed.

[00344] For example, after an interval of 20 ms, the RRC layer receives the measurement response message 3 sent by the physical layer, and obtains the identifier information and other information that is related to the frequency 3 carried in the measurement response message 3. If the RRC layer determines by extracting the previous history information based on the frequency identifier information 3 that frequency 3 is not a 5G LTE frequency, step 608 is performed.

[00345] Step 608: The RRC layer determines whether the 5G anchor cell at frequency 2 and the 5G anchor cell at frequency 3 satisfy the preferred condition.

[00346] For example, both the 5G anchor cell (ie cell B1) at frequency 2 and the 5G anchor cell (ie cell C1) at frequency 3 satisfy the preferred condition.

[00347] For other details, refer to step 507. Details are not repeated here.

[00348] Step 609: The RRC layer optimizes the 5G anchor cell evaluation policy.

[00349] For example, the RRC layer shortens the evaluation duration of both frequency 2 and frequency 3 to 100 ms. It should be noted that the non-5G LTE frequency estimation duration is 300ms. Both frequency priority 2 and enhanced frequency priority 3 (see step 603) satisfy the high priority threshold requirement, that is, both frequency priority 2 and enhanced frequency priority 3 are high priorities. For example, the RRC layer detects that the cell measurement gain (RSRP and SINR) of the 5G anchor cell (cell B1) at frequency 2 meets the high priority threshold, and the cell measurement result (RSRP and SINR) of the 5G anchor cell (cell C1) at frequency 3 does not meet the high priority threshold. The RRC layer may increase the gain (RSRP and SINR) of cell C1 so that the gain of cell C1 meets the high priority threshold.

[00350] Step 610: The RRC layer evaluates the measurement result of each cell.

[00351] In particular, after receiving the frequency measurement result and determining the evaluation policy for each measurement result, the RRC layer may begin to evaluate the frequency measurement result, that is, the cell measurement result for each cell in the frequency. For example, the RRC layer first evaluates the measurement result of each cell at frequency 1, and the evaluation duration is 300ms. Then, after optimizing the frequency estimation policy 2, the RRC layer evaluates the optimized measurement result of each cell at frequency 2, and the estimation duration is 100 ms.

[00352] In addition, RRC evaluates the optimized measurement result of each cell at frequency 3, and the evaluation duration is 100 ms.

[00353] It should be noted that the frequency measurement start time points are different, which is specifically determined based on the duration of the reception and the duration of the estimation policy optimization.

[00354] Step 611: The RRC layer sends a reselect request message to the physical layer.

[00355] For example, in this application, the RRC layer preferably completes the evaluation of the measurement result of each cell at frequency 2, and the measurement result of each cell at frequency 2 meets the evaluation criterion. The RRC layer determines that cell B1 is a 5G anchor cell by extracting the previous history information based on the ID information of each cell (cells B1-B3) at frequency 2.

[00356] Optionally, the RRC layer may further determine whether the measurement result of cell B1 matches the reselection rule. The reselection rule includes:

(1) The cell measurement result is optimal (ie, maximum RSRP and/or maximum SINR) among all cells on the same frequency.

(2) The difference between the cell measurement result of the cell and the optimal cell measurement result of the cell at the same frequency is less than or equal to the first anchoring threshold (which may be set based on the actual requirement, eg, 5 dB).

[00357] In this embodiment, the RRC layer has optimized the cell measurement result (i.e., gain) of cell B1 in step 609. At this step, the optimized cell measurement result for cell B1 matches the reselection rule, and the RRC layer may determine that the terminal can camp on cell B1.

[00358] The RRC layer sends a reselect request message to the physical layer, wherein the reselect request message includes B1 cell ID information to direct the physical layer to perform a subsequent reselection operation in cell B1, for example, to try to camp on cell B1.

[00359] For example, if the RRC layer receives the reselection response message sent by the physical layer, the evaluation procedure ends. If the RRC layer receives the reselection failure message, or after estimating frequency 3, does not receive the reselection response message sent by the physical layer, the RRC layer continues to send a reselection request message to the physical layer, which carries 5G anchor cell ID information on frequency 3.

[00360] Step 612: The physical layer sends a reselection response message to the RRC layer.

[00361] For example, if the terminal has successfully camped on cell B1, the physical layer sends a reselection response message to the RRC layer, and the procedure ends. If the terminal fails to camp on cell B1, the physical layer sends a reselection failure message to the RRC layer or does not send any message and waits for the RRC layer to continue sending the next estimated frequency identifier information.

[00362] Scenario 3

[00363] With reference to FIG. 1, fig. 10 is an exemplary flowchart of a cell selection method. Specifically:

[00364] Step 701: The terminal receives at least one frequency identifier information sent by the network side.

[00365] Specifically, in the connected state, the terminal can receive a configuration message sent by the network side, the configuration message including at least one frequency identifier information, a measurement threshold, and a handover threshold.

[00366] For specific details, see the prior art. Details are not described in this application.

[00367] Step 702: The terminal determines whether the 5G LTE frequency is included in at least one frequency configured on the network side.

[00368] See Scenario 2 for details. Details are not repeated here.

[00369] Step 703: The terminal determines a 5G LTE frequency measurement condition.

[00370] In particular, in a handover scenario, a measurement threshold is configured on the network side. If the quality of the serving cell is above the measurement threshold, then the subsequent procedure need not be initiated; or if the quality of the serving cell is below the measurement threshold, a subsequent measurement procedure is initiated, i.e., step 704 is performed.

[00371] Optionally, if the currently anchored cell is not a 5G anchor cell, the terminal may increase the measurement threshold to expect the terminal to be handed over to the 5G anchor cell.

[00372] It should be noted that step 703 is an optional step that may not be performed. In this application, it is expressly not limited.

[00373] Step 704: The terminal performs a cell measurement on each frequency configured on the network side.

[00374] See Scenario 2 for details. Details are not repeated here.

[00375] Step 705: The terminal determines whether the 5G anchor cell on the 5G LTE frequency meets the preferred condition.

[00376] See Scenario 2 for details. Details are not repeated here.

[00377] Step 706: The terminal determines a 5G anchor cell evaluation policy that matches the preferred condition.

[00378] Specifically, in a handover scenario, an evaluation policy optimization method includes:

(1) Reducing the duration of the evaluation.

(2) Gain increase. In particular, in the handover scenario, the handover threshold is configured on the network side. The terminal may increase the gain of the 5G anchor cell so that the 5G anchor cell meets the handover threshold requirement, thereby satisfying the evaluation criterion.

[00379] The specific details are the same as described in Scenario 2. The details are not repeated here.

[00380] Step 707: The terminal evaluates the frequency measurement result.

[00381] See Scenario 2 for details. Details are not repeated here.

[00382] Step 708: The terminal sends a measurement report to the network side.

[00383] Specifically, in this application, after the terminal evaluates the cell measurement result for each cell at one frequency (that is, the evaluation duration ends and the evaluation criterion is satisfied), the terminal can send a measurement report to the network side, the report including the identifier information and the cell measurement result for each cell at the estimated frequency. That is, the terminal sends the frequency measurement result to the network side after estimating the frequency. In this application, after the terminal optimizes the 5G anchor cell estimation duration, the measurement result of the 5G anchor cell can preferably be reported. In addition, after optimizing the gain of the 5G anchor cell, the probability that the base station will select the 5G anchor cell as the serving cell may increase.

[00384] Finally, in a handover scenario, the terminal can optimize the 5G LTE anchor cell estimation policy to increase the likelihood that the base station will select the 5G LTE anchor cell as the serving cell of the terminal.

[00385] Based on the embodiment shown in FIG. 10, fig. 11 is an exemplary flowchart of a cell selection method. In FIG. eleven:

[00386] Step 801: The RRC layer obtains ID information of at least one frequency configured on the network side.

[00387] See Scenario 2 for details. Details are not repeated here.

[00388] Step 802: The RRC layer determines whether the 5G LTE frequency is included in at least one frequency configured on the network side.

[00389] See Scenario 2 for details. Details are not repeated here.

[00390] Step 803: The RRC layer determines a 5G LTE frequency measurement condition.

[00391] In particular, in a handover scenario, a measurement threshold is configured on the network side. If the quality of the serving cell is above the measurement threshold, then the subsequent procedure need not be initiated; or if the quality of the serving cell is below the measurement threshold, a subsequent measurement procedure is initiated, i.e., step 804 is performed.

[00392] Optionally, if the currently anchored cell is not a 5G anchor cell, the RRC layer may increase the measurement threshold to expect the terminal to be handed over to the 5G anchor cell.

[00393] It should be noted that step 803 is an optional step that may not be performed. In this application, it is expressly not limited.

[00394] Step 804: The RRC layer sends a measurement request message to the physical layer.

[00395] See Scenario 2 for details. Details are not repeated here.

[00396] Step 805: The physical layer sends a measurement confirmation message to the RRC layer.

[00397] For example, the message is used to indicate that the physical layer should receive the measurement request message sent by the RRC layer and complete the appropriate preparation for the measurement.

[00398] Step 806: The physical layer sends a measurement response message to the RRC layer.

[00399] See Scenario 2 for details. Details are not repeated here.

[00400] Step 807: The RRC layer determines whether the 5G anchor cell on the 5G LTE frequency meets the preferred condition.

[00401] See Scenario 2 for details. Details are not repeated here.

[00402] Step 808: The RRC layer determines a 5G anchor cell evaluation policy that meets the preferred condition.

[00403] Specifically, in a handover scenario, an estimation policy optimization method includes:

(1) Reducing the duration of the evaluation.

(2) Gain increase.

[00404] See Scenario 2 for details. Details are not repeated here.

[00405] Step 809: The RRC layer evaluates the frequency measurement result.

[00406] See Scenario 2 for details. Details are not repeated here.

[00407] Step 810: The RRC layer sends a measurement report to the network side.

[00408] Specifically, in this application, after the RRC layer completes the evaluation at one frequency and the frequency meets the evaluation criterion, the RRC layer may send a measurement report to the network side, the report including identifier information and a cell measurement result for each cell at said frequency.

[00409] The following describes a background search procedure for this application based on a particular embodiment. With reference to FIG. 1, fig. 12 is an exemplary flowchart of a cell selection method. Specifically:

[00410] Step 901: The terminal determines if the background search trigger condition is met.

[00411] In particular, in this application, the RRC layer may determine, based on the current docking status of the terminal, whether a background search condition is met.

[00412] Optionally, the background search condition includes, but is not limited to:

(1) No previous historical information is stored in the terminal.

(2) The terminal camps on a non-5G anchor cell. It can be understood that if the terminal fails to camp on the 5G anchor cell in the previous scenario 1 to 3, the RRC layer performs a background search in this claim to wait for the terminal to camp on the 5G anchor cell. The current sticky scenario may include, without limitation, the following specific scenarios or conditions: the terminal is in an idle state, the terminal is in an online state or is in a night period, or the terminal is in a fixed location.

[00413] Optionally, upon detecting that the terminal satisfies the above background search condition, the RRC layer may wait a predetermined duration (which may be set based on the actual requirement, eg, 2 minutes) before performing a subsequent background search procedure.

[00414] Step 902: The terminal scans the cell and obtains identifier information and cell type information for the cell.

[00415] In particular, in this application, the RRC layer may scan one or more cells to receive system messages of one or more cells. The RRC layer can read system messages to obtain cell ID information and read System Information Blocks 2 to obtain cell type information included in said system information blocks.

[00416] In a possible implementation, one or more cells may be neighbor cells configured on the network side.

[00417] In another possible implementation, one or more cells may be all cells that can be scanned by the RRC layer, or this can be understood as a full range scan.

[00418] Step 903: The terminal respectively writes the identifier information and the cell type information to the previous history information.

[00419] Optionally, in this application, if the terminal does not store previous history information, the RRC layer in the terminal may generate a table of previous history information, and accordingly write the received one or more cell ID information and cell type information of each cell into the previous history information.

[00420] Optionally, in this application, if the terminal stores the previous history information, the RRC layer in the terminal appropriately writes the received one or more cell ID information and the cell type information of each cell into the previous history information to update the previous history information.

[00421] Optionally, in this application, when performing a background search, the terminal may additionally obtain information about the frequency of each cell, or this may be understood as obtaining each cell on each frequency. The terminal may record the frequency ID information and the corresponding frequency type information in the previous history information. If the frequency includes a 5G anchor cell, the frequency type information for said frequency is a 5G LTE frequency. It should be noted that the frequency and cell recording method can be shown in Table 1, that is, each frequency and each cell in a frequency can be obtained from Table 1. Alternatively, frequencies can be recorded separately from cells. For example, frequencies are written to a table, and cells are written to another table. In this application, it is expressly not limited.

[00422] In an exemplary implementation, if a terminal camps in a non-5G cell, the RRC layer terminates the background search and determines by performing a background search process that at least one 5G anchor cell is included in the neighboring cells of the terminal, a procedure such as reselection or handover can be performed in at least one 5G anchor cell. For example, the terminal may directly camp on or handoff a 5G anchor cell, or the terminal may again perform the steps in Scenario 1, Scenario 2, or Scenario 3 based on the updated previous history information. In this application, it is expressly not limited.

[00423] The solutions presented in the embodiments of this application are mainly described in terms of interaction between various network elements. It can be understood that in order to implement the above functions, the terminal includes appropriate hardware structures and/or software modules to perform the above functions. One skilled in the art will appreciate that the blocks and steps of the algorithm in the examples described with reference to the embodiments disclosed herein may be implemented in hardware form or in the form of a combination of hardware and computer software in this application. Whether the function is performed by hardware or by hardware controlled by computer software depends on particular applications and design constraints. A person skilled in the art may use different methods to implement the described functions for each particular application, but the implementation should not be considered outside the scope of the technical solutions in the embodiments of this application.

[00424] In embodiments, a terminal device may be divided into functional blocks based on method examples. For example, each function module may be obtained by separation based on a corresponding function, or two or more functions may be integrated into one processing module. The above integrated module may be implemented as a hardware or may be implemented as a functional software module. It should be noted that the modular separation in this embodiment of this application is an example and is simply a logical separation of functions, and there may be another way of separation during actual implementation.

[00425] When each functional unit is divided based on respective functions, and when each functional unit is divided based on respective functions, FIG. 13 is an exemplary block diagram of a terminal 200 used in the previous embodiments. As shown in FIG. 13, the terminal 200 may include a transceiver module 201 and a processing module 202, the transceiver module 201 is configured to receive a configuration message sent by the network side, and the configuration message includes frequency information. The processing unit 202 is configured to determine the first measurement frequency based on the locally stored prior historical information and the configuration message, where the historical anchoring cell corresponding to the first measurement frequency includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell. The processing unit 202 is configured to perform a cell measurement at the first measurement frequency to obtain a measurement result of the first measurement frequency, the measurement result including first cell ID information and a first cell measurement result corresponding to the first cell ID information. The processing unit 202 is further configured to determine, based on the previous history information and the first cell ID information, whether the first cell is the 5G anchor cell. The processing unit 202 is further configured to: if the first cell is a 5G anchor cell and meets the preferred condition, estimating the first cell based on the first preset duration. The processing unit 202 is further configured to: if the first cell is not a 5G anchor cell, estimating the first cell based on the second preset duration, the second preset duration being greater than the first preset duration. The processing unit 202 is further configured to: when the estimation result of the first cell meets a predetermined condition, camping on the first cell or reporting, by the transceiver unit, the measurement result of the first cell to the base station.

[00426] Based on the above technical solution, the preferred condition includes: the measurement result of the first cell is greater than or equal to the first threshold, or the difference between the measurement result of the cell for the currently anchored serving cell, which is obtained by the terminal through the measurement, and the measurement result of the first cell is less than or equal to the second threshold.

[00427] Based on the foregoing technical solution, the previous history information includes frequency history information of at least one frequency and cell information for a cell on which history has been anchored corresponding to each of the at least one frequency, wherein the previous frequency information includes frequency type information, and the cell information includes cell type information.

[00428] Based on the above technical solution, the frequency information includes reselection frequency information of the reselection frequency, a priority corresponding to the reselection frequency, a first measurement threshold, and a second evaluation preset duration; and the processing unit 202 is specifically configured to determine the first measurement frequency based on the previous history information and the reselection frequency information.

[00429] Based on the above technical solution, the processing module 202 is further configured to: if the quality of service of the serving cell to which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is less than or equal to the first priority corresponding to the frequency to which the serving cell belongs, to increase, by the terminal, the first measurement threshold so that it exceeds the quality of service of the serving cell.

[00430] Based on the above technical solution, the processing module 202 is further configured to: if the quality of service of the serving cell on which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, determining that the priority of the first measurement frequency is the second priority, and the second priority is higher than the first priority. The processing module 202 may be further specifically configured to estimate the first cell using a high priority threshold, with the high priority threshold included in the configuration message.

[00431] Based on the above technical solution, if the first cell is a 5G anchor cell and meets the preferred condition, the processing unit 202 is further configured to: if the priority of the first measurement frequency is less than or equal to the first priority corresponding to the frequency of the serving cell on which the terminal is currently assigned, determining that the priority of the first measurement frequency is the second priority, and the second priority is higher than the first priority; and the processing module 202 is further configured to estimate the first cell using the high priority threshold, the high priority threshold being included in the configuration message.

[00432] Based on the above technical solution, the preset rule is a cell reselection rule, and the preset rule includes: the measurement result of the first cell is optimal in the obtained cell measurement results; or the difference between the measurement result of the first cell and the obtained optimal value in the measurement results of the cell is less than or equal to the third threshold.

[00433] Based on the above technical solution, the frequency information includes frequency handover information for the handover frequency, a second measurement threshold, and a second preset estimation duration. The processing unit 202 is specifically configured to determine the first measurement frequency based on the previous history information and the frequency handover information; and if the quality of service of the serving cell on which the terminal is currently anchored is less than the second measurement threshold, and the serving cell is not a 5G anchor cell, the processing unit 202 increases the second measurement threshold to exceed the quality of service of the serving cell.

[00434] Based on the above technical solution, the predetermined condition is the handover condition of the cell.

[00435] Based on the above technical solution, the processing module 202 is further configured to add the measurement result of the first cell to the terminal to obtain the measurement result of the second cell, wherein the difference between the measurement result of the second cell and the measurement result of the first cell is less than or equal to a fourth threshold. The processing unit 202 may be further specifically configured to evaluate the measurement result of the second cell by the terminal. The measurement result of the first cell and the measurement result of the second cell include at least one of the following: the reception power of the reference signal RSRP and the signal-to-interference plus noise ratio SINR.

[00436] Based on the above technical solution, if the first cell is not a 5G anchor cell and the terminal camps on the first cell, the processing unit 202 is further configured to receive a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information. The processing unit 202 is further configured to appropriately write the neighbor cell ID information and the cell type information to the previous history information, where the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[00437] Based on the above technical solution, cell type information is included in the neighbor cell system message SIB2.

[00438] FIG. 14 is an exemplary block diagram of a terminal 300 used in the previous embodiment. As shown in FIG. 14, the terminal 300 may include a processing unit 301, an energy scanning unit 302, and a cell search unit 303. The processing unit 301 is configured to determine at least one candidate frequency based on the locally stored prior history information, wherein the at least one 5G LTE frequency is included in at least one candidate frequency, the history anchoring cell corresponding to the 5G LTE frequency includes a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell. The energy scanning module 302 is configured to perform an energy scan on at least one candidate frequency to obtain an energy scan result of one candidate frequency on the at least one candidate frequency. The cell search module 303 is configured: if the preferred frequency is included in at least one 5G LTE frequency, it is preferable to perform a cell search on the preferred frequency if the energy scan result of the preferred frequency meets the preferred condition. The processing unit 304 is further configured to: if there is a first cell on the preferred frequency that meets the camping condition, camping on the first cell.

[00439] Based on the above technical solution, the previous history information includes frequency information of at least one candidate frequency and cell information for a cell at a single candidate frequency. That the terminal determines at least one candidate frequency based on the locally stored prior history information includes: the terminal determines the 5G LTE frequency based on the frequency information, the frequency information including frequency type information; or the terminal determines the 5G LTE frequency based on the cell information, where the cell information includes cell type information.

[00440] Based on the above technical solution, the preferred condition includes: the preferred frequency energy scan result is greater than or equal to the first threshold; or the difference between the energy scan result corresponding to the candidate frequency with the highest energy scan result and the energy scan result corresponding to the preferred frequency is less than or equal to the second threshold.

[00441] Based on the above technical solution, the processing unit 301 is specifically configured to obtain a cell search result at a preferred frequency, the cell search result including cell ID information and a cell measurement result corresponding to the cell ID information; and determining a preferred cell based on the previous history information, the cell ID information, and the corresponding cell measurement result, and camping on the preferred cell; and the preferred cell is a 5G anchor cell that meets the camping condition.

[00442] Based on the above technical solution, the sticking condition includes: the preferred cell measurement result is optimal in the obtained cell measurement results; or the difference between the measurement result of the preferred cell and the obtained optimal value of the measurement result of the cell is less than or equal to the third threshold.

[00443] Based on the above technical solution, if the serving cell in which the terminal is anchored is a non-5G anchor cell, the processing unit 301 is further configured to receive a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to neighbor cell ID information; and the processing unit 301 is further configured to respectively record neighbor cell ID information and cell type information in the previous history information; and the neighbor cell is a cell configured on the network side, or the neighbor cell is a cell from which the terminal can receive a system message.

[00444] Based on the above technical solution, cell type information is included in the neighbor cell system message SIB2.

[00445] All related contents of the steps in the above method embodiments can be cited in the function descriptions of the respective functional modules. The details are not repeated here.

[00446] The following describes the apparatus provided in an embodiment of this application. As shown in FIG. 15:

[00447] The apparatus includes a processing module 401 and a communication module 402. Optionally, the hardware further includes a storage module 403. The processing unit 401, the communication unit 402, and the storage unit 403 are connected using a communication bus.

[00448] The communication module 402 may be a transceiver-functional apparatus and configured to communicate with another network device or communication network.

[00449] The storage module 403 may include one or more memories, and the memory may be a device used to store programs or data in one or more devices or circuits.

[00450] The storage module 403 may exist independently and be connected to the processing module 401 using a communication bus. Alternatively, the storage module may be integrated with the processing module 401 .

[00451] Hardware 400 may be used in a network device, circuit, hardware component, or chip.

[00452] Apparatus 400 may be a terminal in embodiments of this application. A schematic diagram of a terminal can be shown in FIG. 2. Additionally, communication module 402 of apparatus 400 may include an antenna and a terminal transceiver. Optionally, the communication module 402 may further include an output device and an input device.

[00453] Hardware 400 may be a chip in a terminal in embodiments of this application. The communication module 402 may be an input or output interface, an output, a circuit, or the like. Optionally, the storage unit may store a computer instruction for executing the terminal-side method, so that the processing unit 401 executes the terminal-side method in the above embodiments. The storage unit 403 may be a register, cache, RAM, or the like, and the storage unit 403 may be integrated with the processing unit 401. The storage module 403 may be a ROM or other type of static storage device that can store static information and instructions, and the storage module 403 may be independent of the processing module 401. Optionally, with the development of wireless communication technologies, the transceiver may be integrated into the apparatus 400.

[00454] When the hardware 400 is a terminal in the embodiments of this application or a chip in the terminal, the hardware 400 can implement the method performed by the terminal in the previous embodiments. The details are not repeated here.

[00455] An embodiment of this application further provides a computer-readable storage medium. The method described in the preceding embodiments may be wholly or partially implemented in software, hardware, firmware, or a combination thereof. If the method is implemented in software, the function may be stored or transmitted on a computer-readable medium as one or more instructions or code. A computer-readable medium may include a computer storage medium and a communication medium, and may further include any medium that can transfer a computer program from one place to another. The storage medium may be any available medium accessible to the computer.

[00456] Optionally, the computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk memory, magnetic disk memory or other magnetic memory, or any other medium that can be used to transfer data or store the desired program code in the form of an instruction or data structure, and can be accessed by a computer. In addition, any connection is appropriately referred to as a computer-readable medium. For example, if coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, or microwave) is used to transmit software from a website, server, or other remote source, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, or microwave) is included in the definition of media. The disc (disk) and optical disc (disc) used herein include an optical disc (CD), a laser disc, an optical disc, a digital versatile disc (DVD), a floppy disk, and a Blue-ray disc, wherein the disc (disk) usually reproduces data in a magnetic way, and the optical disc (disc) reproduces data optically using a laser. The above combination should also be included in the scope of the computer-readable medium.

[00457] An embodiment of this application further provides a computer program product. The method described in the preceding embodiments may be wholly or partially implemented in software, hardware, firmware, or a combination thereof. If the method is implemented in software, then the method may be fully or partially implemented as a computer program product. The computer program product includes one or more computer instructions. When a computer program instruction is downloaded and executed on a computer, a procedure or function based on embodiments of this application is generated in whole or in part. The computer may be a general purpose computer, a specialized computer, a network of computers, or other programmable hardware system.

[00458] Embodiments of this application are described above with reference to the accompanying drawings. However, this application is not limited to the specific implementations set forth above. The above specific implementations are merely examples and are not limiting. A person skilled in the art can create a variety of forms without departing from the purpose and protection scope of the claims of the present application, and such forms should fall within the protection scope of this application.

Claims (39)

1. A cell selection method, comprising: receiving, by the terminal, a configuration message sent by the network side, wherein the configuration message contains frequency information; determination by the terminal of the first measurement frequency based on the locally stored previous history information and said configuration message, wherein the cell on which the history has been assigned corresponding to the first measurement frequency contains a 5G anchor cell, and the 5G anchor cell is a Long Term Evolution (LTE) cell that uses a 5G cell as a secondary cell; performing, by the terminal, a cell measurement at the first measurement frequency and obtaining a measurement result of the first measurement frequency, the measurement result comprising first cell ID information and a first cell measurement result corresponding to the first cell ID information; determining by the terminal, based on the previous history information and the first cell ID information, whether the first cell is the 5G anchor cell; if the first cell is a 5G anchor cell and meets the preferred condition, estimating the first cell based on the first preset duration; or if the first cell is not a 5G anchor cell, estimating the first cell based on the second preset duration, wherein the second preset duration is greater than the first preset duration; And when the first cell estimation result satisfies the predetermined condition, latching by the terminal to the first cell or reporting by the terminal said first cell measurement result to the base station. 2. The method according to p. 1, characterized in that the preferred condition contains: said measurement result of the first cell is greater than or equal to the first threshold, or the difference between the QoS of the currently camping serving cell, which is obtained by the terminal through the measurement, and the measurement result of the first cell is less than or equal to the second threshold. 3. The method according to claim 1 or 2, characterized in that the previous chronological information contains chronological information about the frequency of at least one frequency and information about the cell for the cell on which the chronological fixing was carried out corresponding to each of at least one frequency, and the cell information contains information about the cell type. 4. The method according to claim 3, wherein the frequency information comprises reselection frequency information of the reselection frequency, a priority corresponding to the reselection frequency, a first measurement threshold, and a second evaluation preset duration; And wherein the determination by the terminal of the first measurement frequency based on the locally stored prior historical information and the configuration message comprises: determining, by the terminal, a first measurement frequency based on the previous history information and the reselection frequency information. 5. The method of claim 4, wherein after the terminal determines the first measurement frequency based on the locally stored prior history information and the configuration message, the method comprises: if the quality of service of the serving cell on which the terminal is currently assigned is higher than the first measurement threshold, and the priority corresponding to the first measurement frequency is lower than or equal to the first priority corresponding to the frequency to which the serving cell belongs, the terminal increases the first measurement threshold so that it exceeds the quality of service of the serving cell. 6. The method of claim 4, wherein if the first cell is a 5G anchor cell and meets the preferred condition, the method further comprises: if the priority of the first measurement frequency is lower than or equal to the first priority corresponding to the frequency of the serving cell on which the terminal is currently assigned, determining that the priority of the first measurement frequency is the second priority, while the second priority is higher than the first priority; And wherein the estimate of the first cell based on the first preset duration comprises: the terminal's estimation of the first cell using the high priority threshold, with the high priority threshold included in the configuration message. 7. The method of claim 1, wherein the preset rule is a cell reselection rule, and the preset rule comprises: the measurement result of the first cell is optimal among the obtained cell measurement results; or the difference between the first cell measurement result and the optimum value in the obtained cell measurement results is less than or equal to the third threshold. 8. The method of claim 7, wherein the frequency information comprises frequency handover information for frequency handover, a second measurement threshold, and a second estimation preset duration; And wherein the determination by the terminal of the first measurement frequency based on the locally stored prior historical information and the configuration message comprises: determining, by the terminal, a first measurement frequency based on the previous history information and the frequency handover information; And if the quality of service of the serving cell on which the terminal is currently anchored is lower than the second measurement threshold and the serving cell is not a 5G anchor cell, increase, by the terminal, the second measurement threshold to be greater than said quality of service of the serving cell. 9. The method of claim 8, wherein the predetermined condition is a cell handover condition. 10. The method of claim 1, wherein before estimating the first cell based on the first preset duration, the method further comprises: adding by the terminal the measurement result of the first cell to obtain the measurement result of the second cell, wherein the difference between the measurement result of the second cell and the measurement result of the first cell is less than or equal to the fourth threshold; And wherein the estimate of the first cell based on the first preset duration comprises: evaluation by the terminal of the measurement result of the second cell, while the measurement result of the first cell and the measurement result of the second cell comprise at least one of a received reference signal power (RSRP) and a signal-to-interference plus noise ratio (SINR). 11. The method of claim 1, wherein if the first cell is not a 5G anchor cell and the terminal camps on the first cell, the method further comprises: the terminal receiving a neighbor cell system message, the system message including neighbor cell ID information and cell type information corresponding to the neighbor cell ID information; And respectively, the terminal records the neighbor cell ID information and the cell type information in the previous history information, wherein said neighbor cell is a cell configured on the network side, or said neighbor cell is a cell from which the terminal can receive a system message. 12. A communication terminal, wherein the communication terminal comprises a memory and a processor, the memory being coupled to the processor, the memory storing a program instruction, and when the program instruction is executed on the processor, the communication terminal is able to perform the method of any one of claims. 1-11. 13. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and wherein the computer program includes an instruction used to perform the method according to any one of paragraphs. 1-11.

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