WO2021051326A1 - 一种接入控制方法及装置 - Google Patents

一种接入控制方法及装置 Download PDF

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Publication number
WO2021051326A1
WO2021051326A1 PCT/CN2019/106525 CN2019106525W WO2021051326A1 WO 2021051326 A1 WO2021051326 A1 WO 2021051326A1 CN 2019106525 W CN2019106525 W CN 2019106525W WO 2021051326 A1 WO2021051326 A1 WO 2021051326A1
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Prior art keywords
cell
frequency point
frequency
carrier frequency
lte
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PCT/CN2019/106525
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English (en)
French (fr)
Inventor
韩磊
张志勇
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/106525 priority Critical patent/WO2021051326A1/zh
Priority to CN201980091193.7A priority patent/CN113412647A/zh
Publication of WO2021051326A1 publication Critical patent/WO2021051326A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • This application relates to the field of communications, and in particular to an access control method and device.
  • the fourth-generation mobile communication (4G) enters the stage of large-scale commercial use, the future-oriented fifth-generation mobile communication technology (5G) has become a global research and development hotspot.
  • 3GPP has defined two schemes for 5G new radio (NR) networking, namely standalone (SA) and non-standalone (NSA).
  • SA standalone
  • NSA non-standalone
  • For a UE that supports NSA mode when the UE is in the coverage area of a 5G cell, the UE needs to first camp on a 4G cell that supports NSA mode, and then through the process of adding EN-DC, the 4G cell that supports NSA mode will pass Send RRC connection configuration information to the UE to instruct the UE to access the 5G cell.
  • the UE can access the 5G cell through the cell selection process, or camp on a 4G cell that supports SA mode, according to the 4G cell broadcast Initiate the cell reselection to the 5G cell to the 5G cell reselection information, thereby accessing the 5G cell.
  • the UE accesses a more advanced mobile communication network, and generally speaking, the user experience is better.
  • operators may use NSA for 5G coverage of the entire network, or SA for 5G coverage of the entire network, or use NSA or SA or NSA/SA hybrid networking for 5G hotspot coverage.
  • 5G coverage is incomplete or network optimization is not in place, making UEs unable to access 5G cells and use 5G services, which reduces user experience.
  • the embodiments of the present application provide an access control method and device, which are used to improve the success rate of a UE in accessing a 5G cell.
  • the first aspect of the embodiments of the present application provides an access control method, which can be applied to a terminal supporting the dual connectivity technology ENDC in a 5G networking mode to control the cell that the terminal accesses.
  • the terminal may perform cell selection in some cases, for example, when the terminal is turned on, or when returning from a radio resource control (Radio Resource Control, RRC) connected state to the RRC idle state, or when re-entering the service area, it may perform cell selection.
  • Cell selection generally occurs after PLMN selection, and the purpose is to enable the terminal to select a cell that meets the camping conditions for camping as soon as possible.
  • the terminal generally supports cell selection on the frequency points of multiple network standards.
  • the access control method provided in this application mainly involves the process of cell selection on the long-term evolution technology LTE frequency point (or 4G frequency point).
  • LTE frequency point or 4G frequency point.
  • 5G frequency points usually have higher priority, and the terminal can first select cells on the 5G frequency point, so as to preferentially reside on the 5G frequency point.
  • cell selection can be performed on the LTE frequency point.
  • frequency point and carrier frequency in the embodiments of the present application have the same meaning.
  • Cell selection generally includes initial cell selection and cell selection using stored information or historical information.
  • "cell selection on LTE frequency points” can refer to scanning LTE frequency bands according to their own capabilities. The frequency points on the frequency band are used for initial cell selection, or it may refer to using the LTE frequency points stored by the terminal to perform cell selection. The terminal's cell selection on a certain frequency point generally refers to searching for the cell with the best channel quality on the frequency point. If the cell meets the camping condition, it will camp in the cell; if the camping condition is not met, then Continue cell selection on other frequency points.
  • the frequency point can camp on, and the cell on this frequency point can camp on the frequency point, and it can be considered that it can camp on the frequency point.
  • Dual connectivity means that the UE can maintain a connected state with multiple systems or multiple carriers to improve user experience.
  • 3GPP defines the dual connectivity technology in the 5G networking mode as ENDC (E-UTRA-NR Dual Connectivity).
  • ENDC E-UTRA-NR Dual Connectivity
  • 5G cells or NR cells cannot independently provide end-to-end services, but need to rely on 4G cells or LTE cells to provide services.
  • This networking mode is called NSA (Non-standalone Architecture). Coupling architecture) networking.
  • the terminal in the process of cell selection on the LTE frequency point, the terminal first performs cell search on the frequency point where the LTE cell supporting ENDC is located.
  • the frequency point where the LTE cell supporting ENDC is located is referred to as the first frequency point. If the first frequency point can reside, it will reside on the first frequency point.
  • Operators generally increase a large number of LTE frequency points for terminals to camp on, and can set a higher cell selection priority for some of these frequency points, so that when the terminal selects a cell on the LTE frequency point, first set the A higher cell selects a frequency point with a higher priority to perform a cell search, so as to preferentially camp on this type of frequency point.
  • first performing cell search on the frequency point where the ENDC-enabled LTE cell is located refers to setting a higher cell selection priority for the frequency point where the ENDC-enabled LTE cell is located Level, so that the frequency point where the LTE cell supporting ENDC is located is searched before the frequency point that is not set with a higher cell selection priority.
  • LTE frequency points in addition to the frequency points where the higher cell selection priority is not set and the frequency point where the LTE cell supporting ENDC is located, it can also include the higher cell selection according to other standards.
  • Priority frequency points does not limit the search order of the frequency points where the LTE cell supporting ENDC is located and the frequency points set to higher cell selection priority according to other standards.
  • the terminal can access the 5G cell through the LTE cell supporting ENDC, which is beneficial to improve the success rate of the terminal accessing the 5G cell and improve the user experience.
  • the terminal after the terminal accesses the 5G cell through the camped LTE cell, it can store the frequency or frequency band where the LTE cell is located in a storage medium, and store The stored frequency point is called the historical frequency point, and the stored frequency band is called the historical frequency band.
  • the terminal can first perform the cell selection on the historical frequency point or the frequency point in the historical frequency band. Cell search.
  • the first frequency point may be the anchor point frequency point of the 5G non-independent NSA network, or the anchor point frequency point corresponding to the 5G NSA network .
  • the anchor point frequency point or the anchor point frequency band is recorded in a tender issued by an operator.
  • the anchor point frequency point or the anchor point frequency band is pushed by a terminal manufacturer.
  • the method It also includes: if the first frequency point cannot be camped on, then perform cell search at other frequency points. Since the first frequency point refers to the frequency point where there is a cell that supports ENDC, the other frequency point refers to that there is no cell that supports ENDC. For the convenience of description, the “other frequency points” are referred to as the second frequency point. If the second frequency point can reside, then it resides on the second frequency point.
  • the terminal even if the terminal detects that the received signal strength of the second frequency point is higher than the received signal strength of the first frequency point, The terminal still searches for the cell on the first frequency point first.
  • cell search in the process of camping on the second frequency point, cell search can be performed in an idle state, If a cell that supports the 5G networking mode is searched, a cell reselection is initiated to the cell that supports the 5G networking mode, and reselection to the cell that supports the 5G networking mode is added to the existing reselection trigger conditions.
  • the trigger condition helps the terminal access a cell that supports the 5G networking mode through cell reselection, improves the success rate of the terminal accessing the 5G cell, and improves the user experience.
  • a terminal that uses discontinuous reception when there is no data transmission, it can By turning off its receiving circuit to reduce power consumption, thereby increasing its battery life.
  • the basic mechanism of DRX is to configure the DRX cycle.
  • Each DRX cycle includes an active period and a dormant period.
  • the terminal usually wakes up according to the calculated paging moment and monitors the paging message of the cell where it resides, and evaluates the triggering conditions for cell reselection; after completing the active period task, the terminal enters the dormant period of DRX. Accept the data of the downlink channel to reduce power consumption.
  • the terminal can perform cell search during the DRX dormant period after completing the active period tasks and before the next DRX active period arrives.
  • cell search in the process of camping on the second frequency point, cell search can be performed in an idle state, If a cell supporting the 5G networking mode with a channel quality better than the channel quality threshold is found, a cell reselection is initiated to the cell supporting the 5G networking mode.
  • the channel quality of the cell supporting the 5G networking mode described in the reselection trigger condition is better than the channel quality threshold.
  • the cell search may include: on a 5G frequency point Perform a cell search; the searched cell supporting the 5G networking mode is a 5G cell.
  • the cell search includes: on the LTE frequency point Perform cell search; the searched cell supporting the 5G networking mode is an LTE cell supporting ENDC.
  • the system information (for example, SIB2) broadcast by the LTE cell that supports ENDC is carried to indicate that ENDC is supported. ⁇ .
  • the unique identifier of the LTE cell supporting ENDC is stored in the storage medium of the terminal, and the The terminal used to access the 5G cell by camping on the LTE cell supporting ENDC.
  • the second aspect of the embodiments of this application provides an access control method. If a terminal resides in an LTE cell that does not support 5G networking mode, the terminal can perform cell search in an idle state, and if it finds support for 5G networking mode In the cell, you can initiate a cell reselection to the searched cell that supports the 5G networking mode. By adding the reselection trigger condition to the cell that supports the 5G networking mode on the basis of the existing reselection trigger conditions, it is helpful to help The terminal accesses the cell that supports the 5G networking mode through cell reselection, which improves the success rate of the terminal accessing the 5G cell and improves the user experience.
  • a terminal that adopts discontinuous reception (DRX), when there is no data transmission, it can turn off Its receiving circuit reduces power consumption, thereby increasing its battery life.
  • the basic mechanism of DRX is to configure the DRX cycle.
  • Each DRX cycle includes an active period and a dormant period.
  • the terminal usually wakes up according to the calculated paging moment and monitors the paging message of the cell where it resides, and evaluates the triggering conditions for cell reselection; after completing the active period task, the terminal enters the dormant period of DRX.
  • the terminal can perform cell search during the DRX dormant period after completing the active period tasks and before the next DRX active period arrives.
  • cell search can be performed in an idle state.
  • a cell reselection is initiated to the cell that supports the 5G networking mode.
  • the channel quality of the cell supporting the 5G networking mode described in the reselection trigger condition is better than the channel quality threshold.
  • perform The cell search may specifically include: performing cell search on 5G frequency points; the searched cell supporting the 5G networking mode is a 5G cell.
  • perform The cell search may specifically include: performing cell search on LTE frequency points; the searched cell supporting the 5G networking mode is the LTE cell supporting ENDC.
  • the system information of the ENDC-enabled LTE cell broadcast is carried to indicate that ENDC is supported. ⁇ .
  • the unique identifier of the LTE cell supporting ENDC is stored in the storage medium of the terminal , And the terminal once accessed a 5G cell by camping on the LTE cell supporting ENDC.
  • a third aspect of the present application provides an access control device, which is characterized by comprising: a transceiver module, configured to perform cell search at the first frequency in the process of cell selection on the frequency of the long-term evolution technology LTE,
  • the cell of the first frequency point supports the dual connectivity technology ENDC in the 5G networking mode of the 5th generation mobile communication technology;
  • the processing module is configured to reside in the first frequency point if the first frequency point can reside Frequency.
  • the first frequency point is a historical frequency point stored by the terminal or corresponds to a stored historical frequency band, and the terminal has passed the resident An LTE cell on the historical frequency point or the historical frequency band accesses a 5G cell.
  • the first frequency point is an anchor point frequency point of a 5G non-independent NSA network, or an anchor point frequency point corresponding to a 5G NSA network.
  • the anchor point frequency point or the anchor point frequency band is recorded in a tender issued by an operator.
  • the anchor point frequency point or the anchor point frequency band is pushed by a terminal manufacturer.
  • the transceiver The module is also used to, if the first frequency point cannot be camped on, then perform a cell search at the second frequency point, and the cell of the second frequency point does not support ENDC; the processing module is also used to, if the If the second frequency point can reside, it will reside on the second frequency point.
  • the received signal strength of the second frequency point detected by the terminal is higher than that of the first frequency point The received signal strength.
  • the transceiver module is further configured to, in the process of staying at the second frequency point, when idle In the state, a cell search is performed; the processing module is further configured to, if a cell that supports the 5G networking mode is searched, initiate a cell reselection to the cell that supports the 5G networking mode.
  • the transceiver module is specifically configured to perform a cell search during a sleep period of a discontinuous reception period.
  • the channel quality of the cell supporting the 5G networking mode is better than the channel quality threshold.
  • the transceiver module is specifically configured to perform on the 5G frequency point.
  • Cell search; the cell supporting the 5G networking mode is a 5G cell.
  • the transceiver module is specifically configured to: Perform cell search; the cell supporting the 5G networking mode is an LTE cell supporting ENDC.
  • the system information broadcast by the LTE cell supporting ENDC carries information elements for indicating that ENDC is supported.
  • the unique identifier of the LTE cell supporting ENDC is stored in the storage medium of the terminal, and the The terminal used to access the 5G cell by camping on the LTE cell supporting ENDC.
  • the fourth aspect of the embodiments of the present application provides an access control device, including a transceiver module and a processing module.
  • the transceiver module is used to, if you reside in an LTE cell that does not support 5G networking mode, in an idle state, cell search can be performed ;
  • the processing module is used to, if a cell that supports the 5G networking mode is searched, it can initiate a cell reselection to the searched cell that supports the 5G networking mode, and by adding to the existing reselection trigger conditions to support 5G
  • the reselection trigger condition of the cell in the networking mode is conducive to helping the terminal access the cell that supports the 5G networking mode through cell reselection, improving the success rate of the terminal in accessing the 5G cell, and improving the user experience.
  • the transceiver module is specifically configured to perform a cell search during a sleep period of a discontinuous reception period.
  • the channel quality of the cell supporting the 5G networking mode is better than the channel quality threshold.
  • the transceiver module is specifically used to perform cell search on 5G frequency points;
  • the cell supporting the 5G networking mode is a 5G cell.
  • the transceiver module is specifically used to perform cell search on LTE frequency points;
  • the cell supporting the 5G networking mode is an LTE cell supporting ENDC.
  • the system information of the ENDC-enabled LTE cell broadcast is carried to indicate that ENDC is supported. ⁇ .
  • the unique identifier of the LTE cell supporting ENDC is stored in the storage medium of the terminal , And the terminal once accessed a 5G cell by camping on the LTE cell supporting ENDC.
  • the access control apparatus provided by the third aspect and the fourth aspect of the embodiments of the present application may be a computer device or a chip in the computer device.
  • the third aspect of the embodiments of the present application has the function of implementing the embodiments of the above-mentioned first aspect
  • the fourth aspect of the embodiments of the present application has the function of implementing the various embodiments of the above-mentioned second aspect.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the processing module in the access control device may be, for example, a processor
  • the transceiver module may be, for example, a transceiver
  • the transceiver may include a radio frequency circuit
  • the access control device may further include a memory.
  • the memory is used to store computer instructions
  • the processing module is connected to the memory, and the processing module executes the computer instructions stored in the memory so that the access control device executes the first aspect or any possible implementation of the first aspect. Or make the access control device execute the above-mentioned second aspect or any one of the possible implementation manners of the second aspect.
  • the access control device when the access control device is a chip in a computer device, the chip includes: a processing module and a transceiver module.
  • the processing module may be, for example, a processor, and the transceiver module may be, for example, on the chip.
  • the processing module can execute the computer instructions stored in the memory, so that the chip of the computer device can execute any one of the possible implementations of the first aspect or the first aspect, or the access control device can execute the second or the first aspect. Any one of the two possible implementations.
  • the memory is a storage unit in the chip, such as a register, a cache, etc.
  • the memory may also be a memory located outside the chip in a computer device, such as a read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.
  • ROM read-only memory
  • RAM random access memory
  • the processor mentioned in any of the above can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the aforementioned computer equipment can be terminal equipment.
  • Common terminal equipment includes, for example, mobile phones, tablets, desktop computers, wearable devices (such as smart watches), and smart home devices (such as smart speakers or smart TVs or smart screens, etc.) , Vehicle-mounted intelligent equipment, unmanned driving equipment, virtual reality equipment, augmented reality equipment, mixed reality equipment, and artificial intelligence equipment, etc.
  • a fifth aspect of the present application provides a computer device, which includes a processor and a memory, and when the processor runs a computer instruction stored in the memory, it executes any one of the first aspect or the first aspect of the embodiments of the present application. Or execute the method in the second aspect or any one of the possible implementation manners of the second aspect of the embodiments of the present application.
  • the sixth aspect of the present application provides a chip product to implement the method in any one of the possible implementation manners of the first aspect or the first aspect of the embodiments of the present application, or to perform the method as the second aspect or the first aspect of the embodiments of the present application.
  • the method in any one of the possible implementations of the two aspects.
  • a seventh aspect of the present application provides a computer-readable storage medium.
  • the computer-readable storage medium includes instructions.
  • the instructions run on a computer, the computer executes any one of the first aspect or the first aspect of the embodiments of the present application.
  • the method in a possible implementation manner, or execute the method in the second aspect or any one of the possible implementation manners of the second aspect of the embodiments of the present application.
  • the eighth aspect of the present application provides a computer program product.
  • the computer program product includes instructions.
  • the computer executes the first aspect or any possible implementation manner of the first aspect of the embodiments of the present application. Or execute the method in the second aspect or any one of the possible implementation manners of the second aspect of the embodiments of the present application.
  • each device provided in the embodiment of the present application can be used to execute the foregoing corresponding embodiment method, the technical effect that can be obtained by each device embodiment of the present application can refer to the foregoing corresponding method embodiment, and will not be repeated here.
  • Figure 1A is a schematic diagram of the 5G networking mode corresponding to option 3;
  • Figure 1B is a schematic diagram of the 5G networking mode corresponding to option 2;
  • Figure 1C is a schematic diagram of a scenario where the UE cannot access a 5G cell
  • Figure 2 is a flow chart of the state transition of the UE through cell selection and cell reselection
  • FIG. 3A is a schematic diagram of an embodiment of a cell selection method of a UE supporting NSA mode according to this application;
  • FIG. 3B is a detailed step flowchart of step 303 in FIG. 3A;
  • Figure 4 is a schematic diagram of another embodiment of the cell selection method according to the application.
  • FIG. 5 is a schematic diagram of an embodiment of a cell selection method of a UE supporting SA mode according to this application;
  • Fig. 6 is a flowchart of a cell reselection method in the prior art
  • FIG. 7 is a schematic diagram of an embodiment of a cell reselection method for a UE supporting NSA mode according to this application;
  • FIG. 8 is a schematic diagram of another embodiment of a cell reselection method for a UE supporting NSA mode according to this application;
  • FIG. 9 is a schematic diagram of an embodiment of a cell reselection method for a UE supporting SA mode according to this application.
  • FIG. 10 is a schematic diagram of an embodiment of an access control device according to this application.
  • Fig. 11 is a schematic diagram of an embodiment of a computer device of this application.
  • UE user equipment
  • UE user equipment
  • UE user equipment
  • UE user equipment
  • MID mobile internet devices
  • wearable devices such as smart watches
  • smart homes devices
  • Devices such as smart speakers or smart TVs
  • driverless devices virtual reality devices
  • augmented reality devices mixed reality devices
  • artificial intelligence devices etc.
  • 5G base stations In the initial stage of 5G applications, 5G base stations, or New Radio (NR) base stations, are most likely to be arranged through hotspots. It is used in conjunction with long-term evolution (LTE) base stations that already exist in large numbers around, and 5G services are used first in hotspots and high-traffic areas.
  • LTE long-term evolution
  • the Third Generation Partnership Project (3GPP, Third Generation Partnership Project) defines a networking architecture for 5G new air interface networking-Option 3 series. In this networking mode, the UE is connected through LTE and dual-connected
  • the technology uses 5G air interface resources. Dual connectivity means that the UE can maintain a connected state with multiple systems or multiple carriers to improve user experience.
  • 3GPP defines the dual connectivity technology in the 5G networking mode as ENDC (E-UTRA-NR Dual Connectivity).
  • ENDC E-UTRA-NR Dual Connectivity
  • 5G cells or NR cells cannot independently provide end-to-end services, but need to rely on 4G cells or LTE cells to provide services.
  • This networking mode is called NSA (Non-standalone Architecture). Coupling architecture) networking.
  • Figure 1A is a schematic diagram of the 5G networking mode corresponding to Option 3. Both 4G base stations and 5G base stations are connected to the 4G core network.
  • the 4G base station always acts as the master base station (ie MeNB) and the 5G base station as the slave base station (ie SeNB).
  • the S1-C on the control plane is terminated at the 4G base station, and the control plane information between the 4G base station and the 5G base station is exchanged through the Xx-C interface.
  • the user plane has different user plane protocol architectures.
  • the data plane radio bearer can be independently served by the master base station or the slave base station, or can be served by the master base station and the slave base station at the same time.
  • a 4G cell that supports the addition of 5G connections is referred to as a 4G cell that supports the NSA mode.
  • SIB2 System Information Block Type2
  • FIG. 1B is a schematic diagram of the 5G networking mode corresponding to Option 2.
  • the 5G end-to-end network needs to be deployed independently, and new 5G base stations and 5G core networks, 5G base stations and 5G cores are required Therefore, the UE does not need to access the 4G cell first to use the 5G service.
  • the UE can access the 5G cell in the following ways:
  • Access to a 5G cell through the process of cell selection; or stay in a 4G cell that supports reselection to 5G cells, and initiate cell reselection to 5G cells according to the reselection information broadcasted by the 4G cell to 5G cells, thereby accessing 5G cell.
  • a 4G cell that supports reselection to a 5G cell is referred to as a 4G cell that supports the SA mode.
  • the system information related to cell reselection broadcast by 4G cells supporting SA mode includes System Information Block Type 24 (SIB24).
  • SIB24 carries reselection information from 4G cell reselection to 5G cell reselection, based on The UE determines that the 5G cell meets the reselection trigger condition according to the reselection information carried by the SIB24, and the UE can initiate a cell reselection to the 5G cell.
  • the UE accesses a more advanced mobile communication network, and generally speaking, the user experience is better.
  • operators may use NSA for 5G coverage of the entire network, or SA for 5G coverage of the entire network, or use NSA or SA or NSA/SA hybrid networking for 5G hotspot coverage.
  • 5G coverage is incomplete or network optimization is not in place, making UEs unable to access 5G cells and use 5G services, which reduces user experience.
  • the lack of network optimization mentioned here mainly refers to the fact that although there is 5G coverage in a certain area, due to network configuration problems, the UE cannot access the 5G cell and thus cannot obtain 5G services, which affects the user experience.
  • Figure 1C shows two intersecting circular areas (area A and area B) on the ground.
  • the area where area A and area B intersect is area c.
  • the area in area A that does not intersect with area B is area a and area B.
  • the area that does not intersect with area A is area b.
  • area A is covered by 4G cell 1 and 4G cell 2 at the same time, area B is covered by 5G cell 3, and 4G cell 2 neither supports NSA mode nor SA mode.
  • the following respectively takes the scenario where NSA is used for 5G coverage and the scenario where SA is used for 5G coverage as examples, and analyzes the case where the UE cannot access the 5G cell due to network configuration problems.
  • the key to obtaining 5G services when it is in area c is that when the UE selects a cell from 4G cell 1 and 4G cell 2 to camp on in area A, it should choose a cell that supports NSA mode. 4G cell 1 camps on.
  • the UE selects one from multiple 4G cells to perform When camping, the UE should be made to stay in a 4G cell that supports the corresponding 5G networking mode as much as possible, so as to improve the success rate of the UE's subsequent access to the 5G cell.
  • 5G networking mode for example, supporting NSA mode, or supporting SA mode, or supporting both SA mode and NSA mode, etc.
  • the method of selecting a cell to camp on includes, but is not limited to, cell selection.
  • cell switching, redirection, and cell change instructions need to be completed under the leadership and scheduling of the network side.
  • Cell selection and cell reselection are relatively autonomous processes performed by the UE. This application mainly discusses cell selection and cell reselection methods.
  • Figure 2 is a flow chart of the state transition for the UE through cell selection and cell reselection.
  • a priori information generally refers to information related to cell selection stored by the UE, such as carrier frequency, and may also include some cell parameter information.
  • the a priori information may be the information preset in the UE, or the information of the cell where the UE resides during the cell selection process saved for the UE. If the UE stores a priori information, the UE generally preferentially uses the a priori information for cell selection.
  • the prior information generally includes multiple carrier frequencies, and the UE sequentially searches for a suitable cell on the stored multiple carrier frequencies in a certain search order.
  • the UE can initiate an initial cell selection.
  • the initial cell selection means that the UE does not store a priori information, and the UE needs to scan the supported frequency bands according to its own capabilities in order to find a suitable cell to camp on.
  • the order in which each carrier frequency in the prior information is stored in the UE is generally used as the search order.
  • the UE can measure the stored received signal strength indication (RSSI) of each carrier frequency, and use the magnitude order of the RSSI as the search order.
  • RSSI received signal strength indication
  • the UE will select the cell to camp on.
  • the technical solution provided by the embodiments of this application aims to enable a UE that supports 5G networking mode to select one of multiple 4G cells to camp on, and preferentially camp on a 4G cell that supports 5G networking mode, so as to improve the subsequent access of the UE.
  • the success rate of entering a 5G cell when the signal quality of the 5G cell is not very bad, enables the UE to access the 5G cell and use 5G services to improve user experience.
  • a design idea of the technical solution of this application is to design a cell selection method. For UEs that support NSA mode, make the UE preferentially camp on 4G cells that support NSA mode; for UEs that support SA mode, make the UE preferentially camp on Stay in a 4G cell that supports SA mode.
  • the cell selection method provided in this application will be introduced below.
  • FIGS 3A and 3B are schematic diagrams of an embodiment of a cell selection method, which is applied to a UE that supports NSA mode.
  • the UE can use 5G services only through 4G cells that support NSA mode.
  • an embodiment of the cell selection method of this application may include The following steps:
  • the UE can use the prior information for cell selection.
  • Cell selection generally occurs after the PLMN selection. Select a cell that meets the camping conditions as soon as possible to camp. After the UE selects the PLMN, it can read the prior information under the PLMN, and the prior information includes multiple 4G carrier frequencies.
  • the a priori information may be preset in the UE when the UE leaves the factory, or may be the information of the cell where the UE resides during the cell selection process saved before.
  • the UE may store a carrier frequency record, and the carrier frequency record is used to indicate the carrier frequency of the 4G cell supporting the NSA mode.
  • the UE may save multiple carrier frequency records, and each carrier frequency record corresponds to a PLMN. After the UE selects the PLMN, it may read the carrier frequency record corresponding to the PLMN.
  • the UE can determine the target carrier frequency indicated by the carrier frequency record from the multiple 4G carrier frequencies.
  • the target carrier frequency can be one, or two or more.
  • the prior information saved by the UE includes 5 carrier frequencies—carrier frequency A, carrier frequency B, carrier frequency C, carrier frequency D, and carrier frequency E.
  • the carrier frequency record includes three carrier frequencies—carrier frequency D.
  • Carrier frequency E and carrier frequency F are the carrier frequencies of 4G cells that support NSA mode.
  • the target carrier frequency indicated by the carrier frequency record is carrier frequency D and carrier frequency E, or the target carrier frequency can be understood as the common carrier frequency in the prior information and carrier frequency records.
  • the sequence of the target carrier frequency is prior to other carrier frequencies among the multiple carrier frequencies, and the sequence of other carrier frequencies among the multiple carrier frequencies is not limited.
  • the order in the target search sequence from first to last is: carrier frequency D, carrier frequency E, carrier frequency A, carrier frequency B, and carrier frequency C.
  • the sequence of other carrier frequencies among the multiple carrier frequencies may be consistent with the sequence stored in the UE.
  • the later the storage is The carrier frequency is higher in the target search order.
  • the UE can measure the RSSI of each carrier frequency in multiple carrier frequencies, and the order of other carrier frequencies in the multiple carrier frequencies can be consistent with their magnitude order. For other carrier frequencies other than the carrier frequency, the carrier frequency with the larger RSSI has the higher the order in the target search order.
  • step 303 may specifically include the following steps:
  • the UE can search for a cell on the current carrier frequency, which is called the current cell, and obtain synchronization channel information of the current cell, such as the identity (for example) of the current cell and the primary scrambling code, and perform time slot synchronization and frame synchronization. After that, the UE can obtain the information on the broadcast channel of the current cell according to the obtained synchronization channel information, which is called broadcast information, and measure the channel quality of the current cell.
  • the channel quality of the current cell may be signal to interference plus noise ratio (SINR), reference signal receiving power (RSRP), and reference signal receiving quality (reference signal receiving quality). , RSRQ) one or more of.
  • the UE obtaining the broadcast information of the current cell generally includes the following process:
  • MIB Master Information Block
  • the MIB includes the reference and scheduling information of most of the SIBs in the current cell.
  • the MIB is periodically sent on the broadcast channel and its scheduling is static.
  • SIBs System Information Blocks
  • the UE After reading the MIB, the UE can detect the SIBs required for cell selection based on the scheduling information in the MIB, including System Information Block Type1 (SIB1), and obtain cell selection parameters, such as the tracking area where the current cell is located. area, TA), the PLMN of the current cell, the identity of the current cell, and the minimum receiving level of the current cell, etc.
  • SIB1 System Information Block Type1
  • step 3033 Determine whether the current cell meets the camping condition according to the information of the current cell, if it is satisfied, perform step 3034, if not, perform step 3035;
  • the residency conditions can generally include:
  • the PLMN indicated in the SIB1 broadcast by the current cell is one of the following: selected PLMN or registered PLMN or PLMN in Equivalent PLMN. This information is provided by the NAS layer;
  • the TA (indicated in SIB1) where the current cell is located has at least one non-roaming TA;
  • the UE may calculate the S value according to the cell selection parameters in SIB1 and the UE's own capabilities to determine whether the channel quality of the current cell meets the S value requirement, and if it does, it determines that the channel quality of the current cell meets the cell selection S criterion; If not, it is determined that the channel quality of the current cell does not meet the cell selection S criterion.
  • the UE can determine that the current cell meets the camping conditions; if the current cell does not meet any of the above camping conditions, the UE can determine that the current cell does not meet the camping conditions.
  • the UE can camp in the current cell, enter the camping state, or enter the idle state, perform location registration, and initiate a radio resource control (Radio Resource Control, RRC) connection request according to business needs. Migrate to the RRC connection state.
  • RRC Radio Resource Control
  • the UE can perform initial cell selection and continue to search for suitable cells according to its own ability to scan multiple frequency bands supported by it.
  • the UE determines that the current cell is a suitable cell and camps on the current cell; and For different technologies, after the UE reads multiple carrier frequencies, it finds out the target carrier frequency of the 4G cell that supports the NSA mode, and adjusts the search sequence so that the target carrier frequency is selected as the current carrier before other carrier frequencies. Frequency. If the UE can search for a 4G cell that meets the camping conditions on the target carrier frequency, it will camp on the 4G cell. Since the 4G cell is likely to be a 4G cell that supports the NSA mode, the embodiments of this application are beneficial This allows the UE to preferentially camp in a 4G cell that supports the NSA mode.
  • carrier frequency C corresponds to carrier frequency D
  • carrier frequency C and carrier frequency D are recorded in the prior information
  • the RSSI of the carrier frequency C is higher than the RSSI of the carrier frequency D.
  • the UE preferentially selects carrier frequency C as the current carrier frequency, and preferentially searches for 4G cell 2. Based on the 4G cell 2 meeting the camping conditions, the UE camps on 4G cell 2. Since 4G cell 2 does not support NSA mode, when the UE enters area c, the UE cannot access 5G cell C.
  • the UE preferentially selects the carrier frequency D as the current carrier frequency and searches first To 4G cell 1, based on the 4G cell 1 meeting the camping conditions, the UE camps on the 4G cell 1. Since 4G cell 1 supports the NSA mode, when the UE enters area c, the UE can access 5G cell 3 via 4G cell 1 to obtain 5G services.
  • step 303 if the RSSI of the target carrier frequency is too small, it indicates that the cell cannot be searched on the target carrier frequency. If the target carrier frequency is still preferentially selected, it is impossible to use the target carrier frequency to reside in a 4G cell that supports NSA mode. , It will also reduce the efficiency of cell selection. In order to improve the efficiency of cell selection as much as possible on the premise of preferentially camping on 4G cells that support NSA mode, in a possible implementation manner, the UE can set an RSSI threshold. After the UE selects the target carrier frequency, it can measure on the target carrier frequency.
  • the RSSI of the carrier frequency determine whether the measured RSSI is higher than the RSSI threshold, and if the RSSI of the target carrier frequency is higher than the RSSI threshold, search for suitable cells on multiple carrier frequencies according to the target search sequence provided in the embodiments of the present application; If the RSSI of the target carrier frequency is not higher than the RSSI threshold, the current carrier frequency is not selected according to the search order provided in this embodiment of the application. For example, one carrier frequency can be selected from multiple carrier frequencies as the current search order according to the existing search order. Carrier frequency.
  • step 3031 may specifically include the following steps:
  • carrier frequencies D and E are target carrier frequencies.
  • step 3034 If the target carrier frequency does not precede other carrier frequencies in the search sequence, then judge whether the RSSI of the target carrier frequency is higher than the RSSI threshold, if it is higher, go to step 3034, if not higher, go to step 3035;
  • the adjusted search order is from first to last: carrier frequency D, carrier frequency A, carrier Frequency B, carrier frequency C and carrier frequency E.
  • the UE may perform step 3031 multiple times. The following explains how the UE performs step 3031.
  • the UE needs to search for suitable cells on multiple carrier frequencies in sequence (that is, perform cell search and judge the camping condition of the searched cell).
  • the UE selects a carrier frequency from multiple carrier frequencies as the current carrier frequency according to the search order. It can be understood that during a cell selection process, if the UE performs step 3031 for the first time, the UE may select the first carrier frequency in the search order as Current carrier frequency; if the UE is not performing step 3031 for the first time, the UE can select the next carrier frequency in the search sequence as the current carrier frequency, so as to perform cell search and camping condition judgment on multiple carrier frequencies one by one.
  • multiple 4G carrier frequencies include carrier frequency A, carrier frequency B, carrier frequency C, carrier frequency D, and carrier frequency E.
  • the order from first to last is: carrier frequency D, carrier frequency A , Carrier Frequency B, Carrier Frequency C, and Carrier Frequency E.
  • the UE in the same cell selection process, the UE is the first When performing step 303, the UE selects carrier frequency D as the current carrier frequency; when the UE performs step 303 for the second time, the UE selects carrier frequency A after carrier frequency D from multiple carrier frequencies in the search order as the current carrier frequency; When step 303 is executed three times, the UE selects the carrier frequency B after the carrier frequency A from the multiple carrier frequencies as the current carrier frequency according to the search order.
  • the UE can perform initial cell selection and scan multiple frequency bands supported by its own capabilities.
  • the existing process of initial cell selection can be improved with reference to the aforementioned solution.
  • the UE can store a carrier frequency band record, which is used to indicate the carrier of the 4G cell supporting the NSA mode. Frequency band.
  • the UE performs initial cell selection, it can select the target carrier frequency band indicated by the carrier frequency band record from the multiple carrier frequency bands supported, and preferentially search for a suitable cell for camping on the target carrier frequency band.
  • the UE when the UE can add the information of the camped 4G cell to the non-volatile storage medium according to the prior art, the NSA mode is supported based on the camped 4G cell, and the carrier frequency record is added to indicate The carrier frequency corresponding to the 4G cell in the current PLMN is the carrier frequency of the 4G cell supporting the NSA mode.
  • the UE may also add a carrier frequency band record to indicate that the carrier frequency band corresponding to the carrier frequency is the carrier frequency band where the 4G cell supporting the NSA mode is located.
  • the UE may generate a carrier frequency record, or a carrier frequency record, or a carrier frequency record and a carrier frequency record according to information provided by the operator or collected by the manufacturer (for example, according to the bidding issued by the operator).
  • Fig. 4 is a schematic diagram of another embodiment of a cell selection method, which is still applied to UEs supporting NSA mode.
  • another embodiment of the cell selection method of the present application may include the following steps:
  • the order of the target carrier frequency in the target search sequence is earlier than other carrier frequencies among the multiple carrier frequencies;
  • Steps 401 to 403 can be understood with reference to the aforementioned step 301, step 302, and step 3031 respectively, and will not be repeated here.
  • step 402 may not be performed.
  • a 4G carrier frequency is selected from multiple 4G carrier frequencies according to the existing search order (for example, the order of carrier frequency preservation or the order of RSSI strength). Current carrier frequency.
  • step 405. Determine whether the current cell meets the camping condition according to the information of the current cell, if it is satisfied, perform step 406, and if not, perform step 409;
  • the method for the UE to determine whether the current cell meets the camping condition based on the information of the current cell can be understood by referring to the corresponding steps of the existing cell selection. The difference is that in the prior art, once the UE determines that the current cell meets the camping condition, it will directly It is determined that the current cell is a suitable cell for camping; and in the embodiment of the present application, after determining that the current cell meets the camping condition, the UE will not directly determine that the current cell is a suitable cell, but will perform step 406.
  • the UE may store a cell record for indicating a 4G cell that supports the NSA mode.
  • the cell record may include the identity of the 4G cell that supports the NSA mode.
  • the identity of the 4G cell may include the cell identity (CellIdentity) of the 4G cell and the PLMN-Identity List (PLMN-Identity List) obtained by SIB1.
  • the information of the current cell obtained by the UE in step 404 may include the information of the current cell.
  • Identifiers such as the CellIdentity and PLMN-Identity List obtained from the SIB1 of the current cell, the UE can determine whether the current cell supports the NSA mode according to the stored cell records and the current cell identity.
  • an information element is added to SIB2 to indicate whether the current cell supports EN-DC.
  • the information of the current cell obtained in step 404 may include the SIB2 broadcast by the current cell.
  • UE can judge whether the current cell supports NSA mode according to SIB2.
  • the previous two implementations can be combined to determine whether the current cell supports the NSA mode.
  • the UE can obtain the SIB1 broadcast by the current cell to obtain the identity of the current cell, and the UE can determine Whether the identity of the current cell matches the stored cell record, if it matches, it is determined that the current cell supports the NSA mode; if it does not match, the UE continues to obtain the SIB2 of the current cell, and judges whether the current cell supports the NSA mode according to the SIB2.
  • determining whether the current cell supports the NSA mode is only an example. In actual applications, the UE may also use other methods to determine whether the current cell supports the NSA mode.
  • the UE can choose to camp on the current cell.
  • the information of the current cell includes the carrier frequency where the current cell is located, and may also include the identity of the current cell, etc.
  • step 408 and step 409 can be performed, but the embodiment of the present application does not limit the sequence of step 408 and step 409.
  • a suitable cell can be searched for on the carrier frequency in the candidate cell record. Once a cell that meets the camping conditions is searched, the UE selects the cell as a suitable cell for camping, if no cell meeting the camping conditions is found , The UE can continue to perform the initial cell selection, and the specific process can be understood by referring to the existing method of using a priori information for cell selection.
  • the UE Based on the fact that the current cell meets the camping conditions but does not support NSA mode, the UE adds the current cell information to the candidate cell record.
  • the current carrier frequency is the last carrier frequency among multiple carrier frequencies
  • the UE uses the candidate cell record for cell selection. It is helpful to shorten the time of cell selection and improve user experience. It should be noted that in a possible implementation manner, the embodiment of this application may not perform step 408 and step 410. If step 406 determines that the current cell does not support the NSA mode, the UE may perform step 409. In step 409, if the current cell does not support the NSA mode, the UE can perform step 409.
  • the carrier frequency is the last carrier frequency among the multiple carrier frequencies, and the UE can use the stored multiple carrier frequencies for cell selection according to the existing method.
  • the UE can directly select the current cell as a suitable cell for camping , There is no need to perform cell search and staying condition judgment, which is beneficial to further shorten the time of cell selection and improve user experience.
  • the UE sequentially selects a 4G carrier frequency from multiple 4G carrier frequencies as the current carrier frequency. Once the current cell searched on the current carrier frequency meets the camping conditions, the UE immediately determines that the current cell is a suitable cell for camping. In the embodiment of this application, even if the current cell searched on the current carrier frequency meets the camping conditions, if it does not support the NSA mode, the UE can continue to select the next carrier frequency from multiple carrier frequencies as the current carrier frequency When finding a cell that meets the camping conditions and supports the NSA mode, the UE determines that the cell is a suitable cell for camping, which is beneficial for the UE to preferentially camp on a 4G cell that supports the NSA mode.
  • carrier frequency C corresponds to carrier frequency D
  • carrier frequency C and carrier frequency D are recorded in the prior information
  • the RSSI of the carrier frequency C is higher than the RSSI of the carrier frequency D.
  • the UE preferentially selects carrier frequency C as the current carrier frequency, and preferentially searches for 4G cell 2. Based on the 4G cell 2 meeting the camping conditions, the UE camps on 4G cell 2. Since 4G cell 2 does not support NSA mode, when the UE enters area c, the UE cannot access 5G cell C.
  • the UE preferentially selects carrier frequency C as the current carrier frequency, and then preferentially searches for 4G cell 2, although 4G cell 2 satisfies the Remaining conditions, because 4G cell 2 does not support NSA mode, the UE will not immediately select 4G cell 2 as a suitable cell to camp on. Instead, it will continue to search for the cell on carrier frequency D to find 4G cell 1 and determine 4G cell 1. If the camping condition is met and the NSA mode is supported, the UE selects 4G cell 1 as a suitable cell for camping. Since 4G cell 1 supports the NSA mode, when the UE enters area c, the UE can access 5G cell 3 via 4G cell 1 to obtain 5G services.
  • the UE can perform initial cell selection and scan multiple frequency bands supported by its own capabilities.
  • the existing process of initial cell selection can be improved with reference to the aforementioned solution.
  • the UE can store a carrier frequency band record, which is used to indicate the carrier of the 4G cell supporting the NSA mode. Frequency band.
  • the UE performs the initial cell selection, it can select the target carrier frequency band indicated by the carrier frequency band record from the multiple frequency bands supported, and preferentially search for the target carrier frequency band.
  • the UE can store the information of the current cell, and the stored content is called the cell record.
  • the cell record may include the current PLMN, the current carrier frequency, and the information of the current cell.
  • An identifier to indicate that the cell corresponding to the identifier under the current PLMN and the current carrier frequency supports the NSA mode.
  • the UE may delete some cell records according to an aging strategy, for example, may delete cell records whose storage time exceeds a certain period of time.
  • step 406 can be performed before step 405.
  • step 406 if it is determined that the current cell does not support NSA mode, step 409 is performed, and if NSA mode is supported, step 409 is performed. 405;
  • step 405 if the current cell meets the camping condition, then step 407 is executed, and if the current cell does not meet the camping condition, then step 409 is executed.
  • step 408 does not need to be performed, and in step 410, the UE uses a priori information for cell selection. Since the UE cannot use candidate cell records for cell selection, it needs to use all prior information for cell selection. Therefore, it is not conducive to the control of cell selection time.
  • Figure 5 is a schematic diagram of another embodiment of a cell selection method, which is applied to a UE that supports SA mode.
  • the UE needs to pass a 4G cell that supports SA mode to reselect to a 5G cell and use 5G services.
  • Another embodiment of the cell selection method of the present application may include the following steps:
  • step 505. Determine whether the current cell meets the camping condition according to the information of the current cell, if it is satisfied, perform step 506, if not, perform step 509;
  • step 506. Determine whether the current cell supports the SA mode according to the information of the current cell, if it does, execute step 507, and if it does not, execute step 508;
  • the design idea of the embodiment corresponding to FIG. 5 is similar to that of the embodiment corresponding to FIG. 4.
  • the difference is mainly caused by the difference between SA mode and NSA mode.
  • the carrier frequency record selected in step 502 is used to indicate 4G that supports SA mode.
  • the carrier frequency of the cell is not used to indicate the carrier frequency of the 4G cell that supports the NSA mode; for example, in step 506, the UE judges whether the current cell supports the SA mode according to the information of the current cell, instead of judging whether the current cell supports the SA mode NSA mode.
  • the parts other than the above differences and the beneficial effects in steps 501 to 510 can be understood with reference to the corresponding description of the embodiment corresponding to FIG. 4, and will not be repeated here.
  • the UE may store a cell record, which is used to indicate the information of the 4G cell that supports the SA mode, and the information of the 4G cell may include the identity of the 4G cell.
  • the identity of the 4G cell may include the cell identity (CellIdentity) of the 4G cell and the PLMN-Identity List (PLMN-Identity List) obtained by SIB1, and the information of the current cell obtained in step 504 may include the identity of the current cell.
  • the UE can determine whether the current cell supports the SA mode according to the stored cell record and the current cell identity.
  • the UE may obtain the system information of the current cell, and determine whether the current cell supports the SA mode according to the system information.
  • SIB1 generally carries scheduling information for other system information blocks. If the current cell supports reselection to 5G cells, then SIB1 will carry scheduling information for SIB24. Therefore, the UE can obtain SIB1 of the current cell. If SIB1 includes scheduling for SIB24 Information, it can be determined that the current cell supports the SA mode. On the contrary, if SIB1 does not include the scheduling information for SIB24, it can be determined that the current cell does not support the SA mode.
  • the UE in the idle state, can monitor the signal quality of the camping cell and neighboring cells to select a cell that can provide better services.
  • Cell reselection is a standard-defined behavior in mobile communication networks. Referring to Figure 6, the existing cell reselection process generally includes the following steps:
  • step 604 According to the reselection information and the measured signal quality, judge whether there is a target neighboring cell that meets the trigger condition for cell reselection in each neighboring cell, if it is satisfied, perform step 603, if not, perform step 604;
  • the triggering conditions of the existing cell reselection mainly include: 1. The signal quality of the camping cell; 2. The quality or energy of the neighboring cell; 3. The reselection priority of the neighboring cell and the current cell; 4. Reselection parameters, such as signal The quality threshold.
  • the technical solution provided by the embodiments of this application aims to enable a UE that supports 5G networking mode to select one of multiple 4G cells to camp on, and preferentially camp on a 4G cell that supports 5G networking mode, so as to improve the subsequent access of the UE.
  • the success rate of entering a 5G cell when the signal quality of the 5G cell is not very bad, enables the UE to access the 5G cell and use 5G services to improve user experience.
  • Another design idea of the technical solution of the present application is to design a cell reselection method. For a UE that supports NSA mode, when the UE resides in a 4G cell that does not support NSA mode, it is added to initiate a 4G cell that supports NSA mode.
  • the trigger condition of cell reselection increases the probability of UE camping on 4G cells that support NSA mode, thereby increasing the success rate of UE accessing 5G cells; for UEs that support SA mode, when the UE is camping on a 4G cell that does not support SA mode
  • For 4G cells increase the trigger conditions for initiating cell reselection to 4G cells that support SA mode to increase the probability of UE staying in 4G cells that support SA mode, thereby increasing the success rate of UE accessing 5G cells.
  • the cell selection method provided in this application will be introduced below.
  • FIG. 7 is a schematic diagram of an embodiment of a cell reselection method, which is applied to a UE that supports NSA mode.
  • the UE can use 5G services only through 4G cells that support NSA mode.
  • an embodiment of the cell reselection method of this application may include the following step:
  • step 702. Determine whether the searched second 4G cell supports the NSA mode, based on support, perform step 703, and based on non-support, perform step 704;
  • 4G cell 1 If according to the existing cell reselection process, 4G cell 1 does not meet the existing trigger conditions for cell reselection, the UE will not initiate a cell reselection to 4G cell 1, and continue to reside in 4G cell 2. When the UE enters In area c, it will be difficult to access 5G cell 3 that supports NSA mode or SA mode;
  • 4G cell 1 does not meet the existing trigger conditions for cell reselection, since 4G cell 1 supports NSA mode, the UE can still initiate a cell reselection to 4G cell 1.
  • 4G cell 1 supports the NSA mode.
  • the UE can access 5G cell 3 via 4G cell 1 to obtain 5G services.
  • DRX discontinuous reception
  • the basic mechanism of DRX is to configure the DRX cycle.
  • Each DRX cycle includes an active period and a dormant period.
  • the UE usually wakes up according to the calculated paging moment and monitors the paging message of the first 4G cell, and evaluates the trigger conditions for cell reselection; after completing the active period task, the UE enters the dormant period of DRX. Accept the data of the downlink channel to reduce power consumption.
  • the UE may perform the cell reselection provided in the embodiment of this application after completing the active period tasks and before the arrival of the next DRX active period.
  • the method, or it can be understood that the UE can perform the cell reselection method provided in this embodiment in the DRX dormant period in the existing DRX cycle.
  • a timer mechanism can be designed.
  • the duration of the timer can be fixed or gradually extended.
  • the timer can be turned on, and the timer corresponding to FIG. 7 can be started again.
  • the process of the embodiment of the above requires an interval duration T. If cell reselection is not initiated, the timer is started again and the duration of the timer is extended, for example, to 2T, and so on.
  • the UE sets the signal quality threshold and measures the signal quality of the second 4G cell. Based on the signal quality of the second 4G cell being better than the signal quality threshold, and the second 4G cell supports the NSA mode, the UE can initiate a cell reset to the second 4G cell. selected.
  • the UE may perform a cell search based on the neighboring cell information broadcast by the first 4G cell, or, in a possible implementation manner, the UE may perform a cell search based on a pre-stored prior Information for cell search.
  • the UE can detect the information of the second 4G cell based on the stored a priori information.
  • the following takes the 4G cell on the 4G carrier frequency in the a priori information that the second 4G cell can store for the UE as an example to introduce another cell reselection method of this application ⁇ Example.
  • FIG. 8 is a schematic diagram of another embodiment of a cell reselection method, which is applied to a UE that supports NSA mode.
  • the UE can use 5G services only through 4G cells that support NSA mode.
  • another embodiment of the cell reselection method of this application can be Including the following steps:
  • the carrier frequency record is used to indicate the carrier frequency of the 4G cell that supports the NSA mode
  • step 805. Determine whether the signal quality of the current cell is better than the signal quality threshold according to the information of the current cell, if yes, perform step 806, and if it is not higher, perform step 808;
  • step 806 Determine whether the current cell supports the NSA mode according to the information of the current cell, if it does, execute step 807, if not, execute step 808;
  • step 808 Determine whether the current carrier frequency is the last carrier frequency among the multiple carrier frequencies, if yes, perform step 809, and if not, perform step 803;
  • the information of the current cell obtained by the UE in step 804 is mainly used to perform step 805 and step 806, and the UE can perform step 804 according to the information required by step 805 and step 806.
  • another design idea of the technical solution of this application is to design another cell reselection method, which is helpful for supporting For a UE in SA mode, when the UE resides in a 4G cell that does not support the SA mode, a method is provided for the UE to initiate a cell reselection to a 5G cell that supports the SA mode, thereby improving the success rate of the UE in accessing the 5G cell.
  • the following introduces another embodiment of the cell reselection method provided by the present application.
  • Fig. 9 is a schematic diagram of another embodiment of a cell reselection method, which is applied to a UE supporting SA mode.
  • another embodiment of the cell reselection method of the present application may include the following steps:
  • the UE that supports the SA mode can select the 5G frequency point, search for the 5G cell on the 5G frequency point, and detect the information of the 5G cell, such as the channel quality of the 5G cell.
  • step 506 For the method for the UE to determine whether the 4G cell it is camping on supports the SA mode, reference may be made to the corresponding introduction in the foregoing embodiment, for example, the related description of step 506, which is not repeated here.
  • step 902. Determine whether the 5G cell meets the preset trigger condition for cell reselection according to the information of the 5G cell, if it is satisfied, perform step 903, and if it is not satisfied, perform step 904;
  • the system message that it broadcasts does not configure the trigger condition for the cell reselection to the 5G cell.
  • the UE can customize the cell reselection to the 5G cell.
  • the trigger condition may include the channel quality threshold of the 5G cell.
  • the UE moves to the area c, and the channel quality of the 5G cell 3 detected by the UE in the area c is higher.
  • 4G cell 2 does not support SA mode, and the broadcast information does not include reselection information to 5G cells, for example, if SIB24 is not included, UE cannot initiate a cell to 5G cell 3 in area c Re-election, therefore unable to obtain 5G service;
  • the broadcast information does not include reselection information to 5G cells.
  • the 4G cell where the UE resides does not support SA mode, it can search for 5G In cell 3, if the channel quality of 5G cell 3 is better than the channel quality threshold preset by the UE, the UE can initiate a cell reselection to 5G cell 3, access 5G cell 3, and obtain 5G service.
  • the UE usually wakes up according to the calculated paging moment and monitors the paging message of the 4G cell, evaluates the trigger condition of the cell reselection, and then enters the dormant state to save power.
  • the UE may perform the method of this embodiment in the paging gap, for example, after completing the evaluation of the trigger condition of the existing cell reselection and After no neighboring cell meeting the trigger condition is found, the process of the embodiment of the present application is executed.
  • the UE may enter a sleep state.
  • a timer mechanism can be designed.
  • the duration of the timer can be fixed or gradually extended.
  • the timer can be started, and the timer corresponding to FIG. 9 can be started again.
  • the process of the embodiment of the above requires an interval duration of T. If the cell reselection is not initiated, the timer is started again, and the duration of the timer is extended, for example, to 2T, and so on.
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the UE or the chip in the UE includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • each functional module can be divided corresponding to each function, or two or more The functions are integrated in a functional module.
  • the above-mentioned integrated functional modules can be implemented in the form of hardware or software functional units.
  • FIG. 10 shows a schematic structural diagram of an access control device.
  • the access control apparatus 1000 may include: a transceiver module 1001 and a processing module 1002.
  • the transceiver module 1001 is used to perform cell search on the first frequency point in the process of cell selection on the frequency of the long-term evolution technology LTE.
  • the cell supports the dual connectivity technology ENDC in the 5G networking mode of the 5th generation mobile communication technology; the processing module 1002 is configured to camp on the first frequency point if the first frequency point can reside.
  • the first frequency point is a historical frequency point that has been stored by the terminal or corresponds to a stored historical frequency band, and the terminal has been residing on the historical frequency point or the historical frequency point.
  • the LTE cell on the frequency band is connected to the 5G cell.
  • the first frequency point is an anchor point frequency point of a 5G non-independent NSA network, or an anchor point frequency point corresponding to a 5G NSA network.
  • the anchor point frequency point or the anchor point frequency band is recorded in a bid document issued by an operator.
  • the anchor point frequency point or the anchor point frequency band is pushed by the manufacturer of the terminal.
  • the transceiver module 1001 is further configured to, if the first frequency point cannot be camped on, perform a cell search at the second frequency point, and the cell at the second frequency point does not support ENDC;
  • the processing module 1002 is also used to, if the second frequency point can reside, then reside at the second frequency point.
  • the received signal strength of the second frequency point detected by the terminal is higher than the received signal strength of the first frequency point.
  • the transceiver module 1001 is also used to perform cell search in an idle state during the process of staying at the second frequency point; the processing module 1002 is also used to: If a cell that supports the 5G networking mode is found, a cell reselection is initiated to the cell that supports the 5G networking mode.
  • the transceiver module 1001 is specifically configured to perform a cell search in the dormant period of the discontinuous reception period.
  • the channel quality of the cell supporting the 5G networking mode is better than the channel quality threshold.
  • the transceiver module 1001 is specifically configured to perform cell search on a 5G frequency point; the cell supporting the 5G networking mode is a 5G cell.
  • the transceiver module 1001 is specifically configured to perform cell search on LTE frequency points; the cell supporting the 5G networking mode is an LTE cell supporting ENDC.
  • the system information broadcast by the LTE cell supporting ENDC carries information elements used to indicate that the ENDC is supported.
  • the unique identifier of the ENDC-enabled LTE cell is stored in the storage medium of the terminal, and the terminal once accessed the 5G cell by camping on the ENDC-enabled LTE cell.
  • the transceiver module 1001 is used to, if it resides in an LTE cell that does not support the 5G networking mode, it can perform cell search in an idle state; the processing module 1002 is used to: After searching for a cell that supports 5G networking mode, you can initiate a cell reselection to the searched cell that supports 5G networking mode, and by adding reselection to cells that support 5G networking mode on the basis of the existing reselection trigger conditions. The selection of trigger conditions helps the terminal to access a cell that supports the 5G networking mode through cell reselection, improves the success rate of the terminal in accessing the 5G cell, and improves the user experience.
  • the transceiver module 1001 is specifically configured to perform a cell search in the dormant period of the discontinuous reception period.
  • the channel quality of the cell supporting the 5G networking mode is better than the channel quality threshold.
  • the transceiver module 1001 is specifically configured to perform cell search on 5G frequency points; and the support 5G networking The cell of the mode is a 5G cell.
  • the transceiver module 1001 is specifically configured to perform cell search on LTE frequency points; the cell supporting the 5G networking mode is an LTE cell supporting ENDC.
  • the system information broadcast by the LTE cell supporting ENDC carries information elements used to indicate that the ENDC is supported.
  • the unique identifier of the ENDC-enabled LTE cell is stored in the storage medium of the terminal, and the terminal once accessed the 5G cell by camping on the ENDC-enabled LTE cell.
  • the access control apparatus 1000 may be a computer device, specifically a terminal device, the processing module in the access control apparatus 1000 may be, for example, a processor, and the transceiver module may be, for example, a transceiver, and the transceiver may include a radio frequency circuit.
  • the access control apparatus 1000 may further include a memory.
  • the memory is used to store computer instructions
  • the processing module is connected to the memory, and the processing module executes the computer instructions stored in the memory, so that the access control device 1000 executes the method in the foregoing embodiment.
  • the processor in the computer equipment can perform baseband processing and radio frequency processing on the signal
  • the transceiver such as an antenna, can receive and send the signal.
  • the access control apparatus 1000 may be the computer device 1100 shown in FIG. 11.
  • the computer equipment may include: a processor radio frequency (RF) circuit 1110, a memory 1120, an input unit 1130, a display unit 1140, a sensor 1150, an audio circuit 1160, a wireless fidelity (WiFi) module 1170, a processor 1180, and power supply 1190 and other components.
  • RF radio frequency
  • FIG. 11 does not constitute a limitation on the computer device, and may include more or fewer components than those shown in the figure, or a combination of certain components, or different component arrangements.
  • the RF circuit 1110 can be used for receiving and sending signals in the process of sending and receiving information or talking.
  • the processor 1180 After receiving the downlink information of the network side device, it is processed by the processor 1180; in addition, the designed uplink data is sent to the network side device.
  • the RF circuit 1110 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, and the like.
  • LNA low noise amplifier
  • the RF circuit 1110 can also communicate with the network and other devices through wireless communication.
  • the above-mentioned wireless communication can use any communication standard or protocol, including but not limited to global system of mobile communication (GSM), general packet radio service (GPRS), code division multiple access (code division multiple access) multiple access (CDMA), wideband code division multiple access (WCDMA), long term evolution (LTE), email, short messaging service (SMS), etc.
  • GSM global system of mobile communication
  • GPRS general packet radio service
  • code division multiple access code division multiple access
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • LTE long term evolution
  • email short messaging service
  • the memory 1120 may be used to store software programs and modules.
  • the processor 1180 executes various functional applications and data processing of the computer device by running the software programs and modules stored in the memory 1120.
  • the memory 1120 may mainly include a program storage area and a data storage area.
  • the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of a computer device.
  • the memory 1120 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.
  • the input unit 1130 may be used to receive inputted numeric or character information, and generate key signal input related to user settings and function control of the computer device.
  • the input unit 1130 may include a touch panel 1131 and other input devices 1132.
  • the touch panel 1131 also called a touch screen, can collect user touch operations on or near it (for example, the user uses any suitable objects or accessories such as fingers, stylus, etc.) on the touch panel 1131 or near the touch panel 1131. Operation), and drive the corresponding connection device according to the preset program.
  • the input unit 1130 may also include other input devices 1132.
  • other input devices 1132 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackball, mouse, and joystick.
  • the display unit 1140 may be used to display information input by the user or information provided to the user and various menus of the computer device.
  • the display unit 1140 may include a display panel 1141.
  • the display panel 1141 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
  • the touch panel 1131 can cover the display panel 1141. When the touch panel 1131 detects a touch operation on or near it, it transmits it to the processor 1180 to determine the type of touch event, and then the processor 1180 responds to the touch event. The type provides corresponding visual output on the display panel 1141.
  • the touch panel 1131 and the display panel 1141 are used as two independent components to realize the input and input functions of the computer device, but in some embodiments, the touch panel 1131 and the display panel 1141 can be integrated And realize the input and output functions of computer equipment.
  • the computer device may also include at least one sensor 1150, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor can include an ambient light sensor and a proximity sensor.
  • the ambient light sensor can adjust the brightness of the display panel 1141 according to the brightness of the ambient light.
  • the proximity sensor can close the display panel 1141 and the display panel 1141 when the computer device is moved to the ear. / Or backlight.
  • the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary.
  • the speaker 1161 and the microphone 1162 can provide an audio interface between the user and the computer device.
  • the audio circuit 1160 can transmit the electrical signal converted from the received audio data to the speaker 1161, which is converted into a sound signal by the speaker 1161 for output; on the other hand, the microphone 1162 converts the collected sound signal into an electrical signal, and the audio circuit 1160 After being received, it is converted into audio data, and then processed by the audio data output processor 1180, and then sent to another device via the RF circuit 1110, or the audio data is output to the memory 1120 for further processing.
  • WiFi is a short-distance wireless transmission technology.
  • computer equipment can help users send and receive emails, browse web pages, and access streaming media. It provides users with wireless broadband Internet access.
  • FIG. 11 shows the WiFi module 1170, it is understandable that it is not a necessary component of the computer equipment and can be omitted as needed without changing the essence of the invention.
  • the processor 1180 is the control center of the computer equipment. It uses various interfaces and lines to connect the various parts of the entire computer equipment, runs or executes the software programs and/or modules stored in the memory 1120, and calls the data stored in the memory 1120. , Perform various functions of computer equipment and process data, so as to monitor the computer equipment as a whole.
  • the processor 1180 may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP, a digital signal processor (DSP), or an application specific integrated circuit (application specific integrated circuit). integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logic block diagrams disclosed in this application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. Combining the steps of the method disclosed in this application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the apparatus may include multiple processors or the processors may include multiple processing units.
  • the processor 1180 may be a single-core processor, or a multi-core or many-core processor.
  • the processor 1180 may be an ARM architecture processor.
  • the processor 1180 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 1180.
  • the computer device also includes a power supply 1190 (such as a battery) for supplying power to various components.
  • a power supply 1190 (such as a battery) for supplying power to various components.
  • the power supply 1190 can be logically connected to the processor 1180 through a power management system, so that functions such as charging, discharging, and power consumption management can be managed through the power management system. .
  • the computer device may also include a camera, a Bluetooth module, etc., which will not be repeated here.
  • the computer equipment provided in the embodiments of this application may be a mobile phone, a tablet computer, a desktop computer, a wearable device (such as a smart watch), a smart home device (such as a smart audio or a smart TV), a vehicle-mounted smart device, an unmanned driving device, and virtual reality.
  • the access control apparatus 1000 may be a chip in a computer device, and the chip includes a processing module 1002 and a transceiver module 1001.
  • the transceiver module 1001 may be implemented by a transceiver, and the processing module 1002 may be implemented by a processor.
  • the transceiver module 1001 may be, for example, an input/output interface, a pin, or a circuit.
  • the processing module 1002 can execute computer-executable instructions stored in the storage unit.
  • the memory is a storage unit in the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit in the computer device located outside the chip, such as a read-only memory (ROM) Or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.
  • ROM read-only memory
  • RAM random access memory
  • multiple processing chips can respectively complete the functions of one of the modules, or one chip can complete the functions of multiple modules. In practical applications, due to cost, performance, technology and other factors, one chip is generally used to implement the functions of multiple modules.
  • the chip type can be CPU, DSP, FPGA or a chip with similar functions.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • wired such as coaxial cable, optical fiber, digital subscriber line (DSL)
  • wireless such as infrared, wireless, microwave, etc.
  • the computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • words such as “exemplary” or “for example” are used as examples, illustrations, or illustrations. Any embodiment or design solution described as “exemplary” or “for example” in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as “exemplary” or “for example” are used to present related concepts in a specific manner.

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Abstract

本申请提供一种接入控制方法及装置，用于提高UE接入5G小区的成功率。本申请提供的接入控制方法包括：在LTE的频点上进行小区选择的过程中，先在支持ENDC的LTE小区所在的频点上进行小区搜索，为了便于描述，在本申请实施例中，将支持ENDC的LTE小区所在的频点称作第一频点。若第一频点可以驻留，则驻留在第一频点。通过将支持ENDC的LTE小区所在的频点设置为具有较高的小区选择优先级，有利于提高终端驻留在支持ENDC的LTE小区的概率，以使得终端通过支持ENDC的LTE小区接入5G小区，从而有利于提高终端接入5G小区的成功率，提高用户体验。

Description

一种接入控制方法及装置 技术领域
本申请涉及通信领域，尤其涉及一种接入控制方法及装置。
背景技术
随着第四代移动通信(4G)进入规模商用阶段，面向未来的第五代移动通信技术(5G)已成为全球研发热点。目前，3GPP针对5G新空口(new radio，NR)组网定义了两种方案，分别是独立组网(standalone，SA)和非独立组网(non-standalone，NSA)。对于支持NSA模式的UE，当该UE处于5G小区的覆盖区域内时，该UE需要首先驻留在支持NSA模式的4G小区，之后通过EN-DC的添加过程，由支持NSA模式的4G小区通过向该UE发送RRC连接配置信息来指示该UE接入5G小区。对于支持SA模式的UE，当该UE处于5G小区的覆盖区域内时，该UE可以通过小区选择的流程接入5G小区，或者，驻留在支持SA模式的4G小区，根据该4G小区广播的向5G小区的重选信息发起向5G小区的小区重选，从而接入5G小区。
UE接入更先进的移动通信网络，一般而言，用户体验更佳。根据运营商的不同需求，在5G的实际网络部署中，运营商可能采用NSA进行全网5G覆盖，或者，采用SA进行全网5G覆盖，或者，采用NSA或SA或NSA/SA混合组网进行5G热点覆盖。但是，无论运营商采用哪种方案进行5G覆盖，都存在5G覆盖不全或者网络优化没有到位的情况，使得UE无法接入5G小区，使用5G服务，降低用户体验。
发明内容
本申请实施例提供一种接入控制方法及装置，用于提高UE接入5G小区的成功率。
下面通过不同的方面示例性地介绍本申请提供的方案，应理解的是，以下各个方面的实现方式和有益效果可互相参考。
本申请实施例第一方面提供了一种接入控制方法，可以应用于支持5G组网模式下的双连接技术ENDC的终端，以控制终端接入的小区。终端在一些情况下可以进行小区选择，例如，终端在开机时，或从无线资源控制(Radio Resource Control，RRC)连接态返回RRC空闲态时，或重新进入服务区时，可以进行小区选择。小区选择一般发生在PLMN选择后，目的是使终端尽快选择一个满足驻留条件的小区进行驻留。终端一般支持在多种网络制式的频点上进行小区选择，本申请提供的接入控制方法主要涉及在长期演进技术LTE的频点(或称4G频点)上进行小区选择的过程。可以理解的是，随着5G的普及，为了提高用户体验，5G的频点通常具有更高优先级，终端可以先行在5G的频点上进行小区选择，以优先驻留在5G频点上的小区(简称驻留在5G频点)，若未搜索到可以驻留的5G频点，可以在LTE的频点上进行小区选择。需要说明的是，本申请实施例中的“频点”与“载波频率”的含义相同。
小区选择一般包括初始小区选择和利用存储信息或称作历史信息进行小区选择，本申请实施例中“在LTE的频点上进行小区选择”，可以指根据自身能力扫描LTE的频段，在LTE的频段上的频点进行初始小区选择，或者，可以指利用终端已存储的LTE的频点进行小区选择。 终端在某个频点上进行小区选择一般指，在该频点上搜索信道质量最优的小区，若该小区满足驻留条件，则在该小区进行驻留，若不满足驻留条件，则在其他频点上继续进行小区选择。本申请实施例中，某个频点上存在满足驻留条件的小区，可以认为该频点可以驻留，在该频点上的小区进行驻留，可以认为可以驻留在该频点。
双连接是指UE可以和多个系统或多个载波保持连接状态，以提升用户体验。3GPP将5G组网模式下的双连接技术定义为ENDC(E-UTRA-NR Dual Connectivity)。这种组网模式下，5G小区或称NR小区不能独立提供端到端服务，而需要依托4G小区或称LTE小区来提供服务，将这种组网模式称为NSA(Non-standalone Architecture，紧耦合架构)组网。
在本申请实施例第一方面提供的方法中，终端在LTE的频点上进行小区选择的过程中，先在支持ENDC的LTE小区所在的频点上进行小区搜索，为了便于描述，在本申请实施例中，将支持ENDC的LTE小区所在的频点称作第一频点。若第一频点可以驻留，则驻留在第一频点。
运营商一般提高大量供终端驻留的LTE的频点，可以为其中的部分频点设置较高的小区选择优先级，使得终端在LTE的频点上进行小区选择的过程中，先在设置有较高的小区选择优先级的频点上进行小区搜索，以优先驻留在这类频点。本申请实施例第一方面提供的接入控制方法中，先在支持ENDC的LTE小区所在的频点上进行小区搜索是指，为支持ENDC的LTE小区所在的频点设置较高的小区选择优先级，使得支持ENDC的LTE小区所在的频点先于未被设置较高的小区选择优先级的频点被搜索。需要说明的是，LTE的频点中，除了未被设置较高的小区选择优先级的频点和支持ENDC的LTE小区所在的频点外，还可以包括根据其他标准设置为较高的小区选择优先级的频点，本申请实施例并未限定支持ENDC的LTE小区所在的频点和根据其他标准设置为较高的小区选择优先级的频点被搜索的先后顺序。
在本申请实施例第一方面提供的接入控制方法中，通过将支持ENDC的LTE小区所在的频点设置为具有较高的小区选择优先级，有利于提高终端驻留在支持ENDC的LTE小区的概率，以使得终端通过支持ENDC的LTE小区接入5G小区，从而有利于提高终端接入5G小区的成功率，提高用户体验。
基于第一方面，在第一方面的第一种可能的实现方式中，终端通过驻留的LTE小区接入5G小区后，可以将该LTE小区所在的频点或频段存储在存储介质中，将存储的频点称作历史频点，将存储的频段称作历史频段，终端在LTE的频点上进行小区选择的过程中，可以先在该历史频点或该历史频段中的频点上进行小区搜索。
基于第一方面，在第一方面的第二种可能的实现方式中，所述第一频点可以为5G非独立NSA组网的锚点频点，或对应于5G NSA组网的锚点频段。
基于第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，所述锚点频点或所述锚点频段记录在运营商发布的标书中。
基于第一方面的第二种可能的实现方式，在第一方面的第四种可能的实现方式中，所述锚点频点或所述锚点频段为终端的厂商推送的。
基于第一方面或第一方面的第一种可能的实现方式至第四种可能的实现方式中任一种可能的实现方式，在第一方面的第五种可能的实现方式中，所述方法还包括：若所述第一频点不可以驻留，则在其他频点进行小区搜索，由于第一频点指存在支持ENDC的小区的频点，因此其他频点指不存在支持ENDC的小区的频点，为了便于描述，将“其他频点”称作第二频点。 若所述第二频点可以驻留，则驻留在所述第二频点。
基于第一方面的第五种可能的实现方式，在第一方面的第六种可能的实现方式中，即使终端检测到第二频点的接收信号强度高于第一频点的接收信号强度，终端仍然先在第一频点上搜索小区。
基于第一方面的第五种可能的实现方式，在第一方面的第七种可能的实现方式中，驻留在所述第二频点的过程中，可以在空闲状态下，进行小区搜索，若搜索到支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选，通过在现有重选触发条件的基础上增加向支持5G组网模式的小区的重选触发条件，有利于帮助终端通过小区重选接入支持5G组网模式的小区，提高终端接入5G小区的成功率，提高用户体验。
基于第一方面的第七种可能的实现方式，在第一方面的第八种可能的实现方式中，对于采用不连续接收(discontinuous reception，DRX)的终端，其在没有数据传输的时候，可以通过关闭其接收电路来降低功耗，从而提升其电池的使用时间。DRX的基本机制是为配置DRX周期，每个DRX周期包括激活期和休眠期。在DRX的激活期，终端通常按照计算的寻呼时刻唤醒并监听驻留的小区的寻呼消息，进行小区重选的触发条件的评估；完成激活期任务后，终端进入DRX的休眠期，不接受下行信道的数据以降低功耗。为了不影响终端在现有激活期需要完成的任务，终端可以在完成激活期任务后、在下一个DRX激活期到来前，即在DRX的休眠期进行小区搜索。
基于第一方面的第七种可能的实现方式，在第一方面的第九种可能的实现方式中，驻留在所述第二频点的过程中，可以在空闲状态下，进行小区搜索，若搜索到信道质量优于信道质量阈值的支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。通过向重选触发条件中所述支持5G组网模式的小区的信道质量优于信道质量阈值。
基于第一方面的第七种至第九种中任意一种可能的实现方式，在第一方面的第十种可能的实现方式中，所述进行小区搜索，可以包括：在5G的频点上进行小区搜索；所述搜索到的支持5G组网模式的小区为5G小区。
基于第一方面的第七种至第九种中任意一种可能的实现方式，在第一方面的第十一种可能的实现方式中，所述进行小区搜索，包括：在LTE的频点上进行小区搜索；所述搜索到的支持5G组网模式的小区为支持ENDC的LTE小区。
基于第一方面的第十一种可能的实现方式，在第一方面的第十二种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息(例如SIB2)携带用于指示支持ENDC的信元。
基于第一方面的第十一种可能的实现方式，在第一方面的第十二种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
本申请实施例第二方面提供一种接入控制方法，若终端驻留在不支持5G组网模式的LTE小区，在空闲状态下，该终端可以进行小区搜索，若搜索到支持5G组网模式的小区，可以向该搜索到的支持5G组网模式的小区发起小区重选，通过在现有重选触发条件的基础上增加向支持5G组网模式的小区的重选触发条件，有利于帮助终端通过小区重选接入支持5G组网模式的小区，提高终端接入5G小区的成功率，提高用户体验。
基于本申请实施例第二方面，在本申请第二方面的第一种可能的实现方式中，对于采用 不连续接收(discontinuous reception，DRX)的终端，其在没有数据传输的时候，可以通过关闭其接收电路来降低功耗，从而提升其电池的使用时间。DRX的基本机制是为配置DRX周期，每个DRX周期包括激活期和休眠期。在DRX的激活期，终端通常按照计算的寻呼时刻唤醒并监听驻留的小区的寻呼消息，进行小区重选的触发条件的评估；完成激活期任务后，终端进入DRX的休眠期，不接受下行信道的数据以降低功耗。为了不影响终端在现有激活期需要完成的任务，终端可以在完成激活期任务后、在下一个DRX激活期到来前，即在DRX的休眠期进行小区搜索。
基于本申请实施例第二方面，在本申请第二方面的第二种可能的实现方式中，驻留在所述第二频点的过程中，可以在空闲状态下，进行小区搜索，若搜索到信道质量优于信道质量阈值的支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。通过向重选触发条件中所述支持5G组网模式的小区的信道质量优于信道质量阈值。
基于本申请实施例第二方面或第二方面的第一种可能的实现方式或第二方面的第二种可能的实现方式，在本申请第二方面的第三种可能的实现方式中，进行小区搜索，可以具体包括：在5G的频点上进行小区搜索；搜索到的支持5G组网模式的小区为5G小区。
基于本申请实施例第二方面或第二方面的第一种可能的实现方式或第二方面的第二种可能的实现方式，在本申请第二方面的第四种可能的实现方式中，进行小区搜索，可以具体包括：在LTE的频点上进行小区搜索；搜索到的支持5G组网模式的小区为支持ENDC的LTE小区。
基于本申请实施例第二方面的第四种可能的实现方式，在本申请第二方面的第六种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
基于本申请实施例第二方面的第四种可能的实现方式，在本申请第二方面的第七种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
本申请第三方面提供一种接入控制装置，其特征在于，包括：收发模块，用于在长期演进技术LTE的频点上进行小区选择的过程中，先在第一频点进行小区搜索，所述第一频点的小区支持第5代移动通信技术5G组网模式下的双连接技术ENDC；处理模块，用于若所述第一频点可以驻留，则驻留在所述第一频点。
基于第三方面，在第三方面的第一种可能的实现方式中，所述第一频点为终端已存储的历史频点或对应于已存储的历史频段，并且所述终端曾经通过驻留在所述历史频点或所述历史频段上的LTE小区接入5G小区。
基于第三方面，在第三方面的第二种可能的实现方式中，所述第一频点为5G非独立NSA组网的锚点频点，或对应于5G NSA组网的锚点频段。
基于第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，所述锚点频点或所述锚点频段记录在运营商发布的标书中。
基于第三方面的第二种可能的实现方式，在第三方面的第四种可能的实现方式中，所述锚点频点或所述锚点频段为终端的厂商推送的。
基于第三方面或第三方面的第一种可能的实现方式至第四种可能的实现方式中任一种可能的实现方式，在第三方面的第五种可能的实现方式中，所述收发模块还用于，若所述第一 频点不可以驻留，则在第二频点进行小区搜索，所述第二频点的小区不支持ENDC；所述处理模块还用于，若所述第二频点可以驻留，则驻留在所述第二频点。
基于第三方面的第五种可能的实现方式，在第三方面的第六种可能的实现方式中，终端检测到的所述第二频点的接收信号强度高于所述第一频点的接收信号强度。
基于第三方面的第五种可能的实现方式，在第三方面的第七种可能的实现方式中，所述收发模块还用于，驻留在所述第二频点的过程中，在空闲状态下，进行小区搜索；所述处理模块还用于，若搜索到支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。
基于第三方面的第七种可能的实现方式，在第三方面的第八种可能的实现方式中，所述收发模块具体用于，在不连续接收周期的休眠期进行小区搜索。
基于第三方面的第七种可能的实现方式，在第三方面的第九种可能的实现方式中，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
基于第三方面的第七种至第九种中任一种可能的实现方式，在第三方面的第十种可能的实现方式中，所述收发模块具体用于，在5G的频点上进行小区搜索；所述支持5G组网模式的小区为5G小区。
基于第三方面的第七种至第九种中任一种可能的实现方式，在第三方面的第十一种可能的实现方式中，所述收发模块具体用于，在LTE的频点上进行小区搜索；所述支持5G组网模式的小区为支持ENDC的LTE小区。
基于第三方面的第十一种可能的实现方式，在第三方面的第十二种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
基于第三方面的第十一种可能的实现方式，在第三方面的第十三种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
本申请实施例第四方面提供一种接入控制装置，包括收发模块和处理模块，收发模块用于，若驻留在不支持5G组网模式的LTE小区，在空闲状态下，可以进行小区搜索；处理模块用于，若搜索到支持5G组网模式的小区，可以向该搜索到的支持5G组网模式的小区发起小区重选，通过在现有重选触发条件的基础上增加向支持5G组网模式的小区的重选触发条件，有利于帮助终端通过小区重选接入支持5G组网模式的小区，提高终端接入5G小区的成功率，提高用户体验。
基于本申请实施例第四方面，在本申请第四方面的第一种可能的实现方式中，所述收发模块具体用于，在不连续接收周期的休眠期进行小区搜索。
基于本申请实施例第四方面，在本申请第四方面的第二种可能的实现方式中，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
基于本申请实施例第四方面或第四方面的第一种可能的实现方式或第四方面的第二种可能的实现方式，在本申请第四方面的第三种可能的实现方式中，所述收发模块具体用于，在5G的频点上进行小区搜索；
所述支持5G组网模式的小区为5G小区。
基于本申请实施例第四方面或第四方面的第一种可能的实现方式或第四方面的第二种可 能的实现方式，在本申请第四方面的第四种可能的实现方式中，所述收发模块具体用于，在LTE的频点上进行小区搜索；
所述支持5G组网模式的小区为支持ENDC的LTE小区。
基于本申请实施例第四方面的第四种可能的实现方式，在本申请第四方面的第六种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
基于本申请实施例第四方面的第四种可能的实现方式，在本申请第四方面的第七种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
本申请实施例第三方面和第四方面提供的接入控制装置，可以是计算机设备，也可以是计算机设备内的芯片。本申请实施例第三方面具有实现上述第一方面的各实施例的功能，本申请实施例第四方面具有实现上述第二方面的各实施例的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。
在一种可能的设计中，当接入控制装置为计算机设备时，接入控制装置中的处理模块可以例如是处理器，收发模块可以例如是收发器，该收发器可以包括射频电路。
可选地，该接入控制装置还可以包括存储器。该存储器用于存储计算机指令，该处理模块与该存储器连接，该处理模块执行该存储器存储的计算机指令，以使该接入控制装置执行上述第一方面或第一方面的任意一种可能的实现方式，或使该接入控制装置执行上述第二方面或第二方面的任意一种可能的实现方式。
在另一种可能的设计中，当接入控制装置为计算机设备内的芯片时，该芯片包括：处理模块和收发模块，该处理模块例如可以是处理器，该收发模块例如可以是该芯片上的输入/输出接口、管脚或电路等。该处理模块可执行存储器存储的计算机指令，以使该计算机设备的芯片执行上述第一方面或第一方面的任意一种可能的实现方式，或使该接入控制装置执行上述第二方面或第二方面的任意一种可能的实现方式。
可选地，所述存储器为所述芯片内的存储单元，如寄存器、缓存等，所述存储器还可以是计算机设备内的位于所述芯片外部的存储器，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
其中，上述任一处提到的处理器，可以是一个通用中央处理器(CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制上述第一方面或第一方面的任意一种可能的实现方式，或使该接入控制装置执行上述第二方面或第二方面的任意一种可能的实现方式的程序执行的集成电路。
上述提到的计算机设备可以为终端设备，常见的终端设备例如包括：手机、平板电脑、台式电脑、可穿戴设备(例如智能手表)、智能家庭设备(例如智能音响或智能电视或智慧屏等)、车载智能设备、无人驾驶设备、虚拟现实设备、增强现实设备、混合现实设备、以及人工智能设备等。
本申请第五方面提供一种计算机设备，该计算机设备包括处理器和存储器，该处理器在 运行存储器存储的计算机指令时，执行如本申请实施例第一方面或第一方面的任意一种可能的实现方式中的方法，或执行如本申请实施例第二方面或第二方面的任意一种可能的实现方式中的方法。
本申请第六方面提供了一种芯片产品，以执行如本申请实施例第一方面或第一方面的任意一种可能的实现方式中的方法，或执行如本申请实施例第二方面或第二方面的任意一种可能的实现方式中的方法。
本申请第七方面提供一种计算机可读存储介质，该计算机可读存储介质包括指令，当指令在计算机上运行时，使得计算机执行如本申请实施例第一方面或第一方面的任意一种可能的实现方式中的方法，或执行如本申请实施例第二方面或第二方面的任意一种可能的实现方式中的方法。
本申请第八方面提供一种计算机程序产品，该计算机程序产品包括指令，当指令在计算机上运行时，使得计算机执行如本申请实施例第一方面或第一方面的任意一种可能的实现方式中的方法，或执行如本申请实施例第二方面或第二方面的任意一种可能的实现方式中的方法。
由于本申请实施例提供的各装置可用于执行前述对应的实施例方法，因此本申请各装置实施例所能获得到的技术效果可参考前述对应的方法实施例，此处不再赘述。
附图说明
图1A为选项3对应的5G组网模式的示意图；
图1B为选项2对应的5G组网模式的示意图；
图1C为UE无法接入5G小区的场景示意图；
图2为UE通过小区选择和小区重选进行状态转移的流程图；
图3A为本申请支持NSA模式的UE的小区选择方法一个实施例示意图；
图3B为图3A中步骤303的细化步骤流程图；
图4为本申请小区选择方法另一个实施例示意图；
图5为本申请支持SA模式的UE的小区选择方法一个实施例示意图；
图6为现有技术中小区重选方法的流程图；
图7为本申请支持NSA模式的UE的小区重选方法一个实施例示意图；
图8为本申请支持NSA模式的UE的小区重选方法另一个实施例示意图；
图9为本申请支持SA模式的UE的小区重选方法一个实施例示意图；
图10为本申请接入控制装置一个实施例示意图；
图11为本申请计算机设备一个实施例示意图。
具体实施方式
以下，对本申请中的部分用语进行解释说明，以便于本领域技术人员理解。
终端，又称之为用户设备(user equipment，UE)，常见的UE例如：手机、平板电脑、台式电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备(例如智能手表)、智能家庭设备(例如智能音响或智能电视)、车载智能设备、无人驾驶设备、虚拟现实设备、 增强现实设备、混合现实设备、以及人工智能设备等。
随着第五代移动通信技术(5G，Fifth-generation)时代的到来，在5G应用的初级阶段，5G基站或称作新空口(NR，New Radio)基站，开始最可能通过热点插花的方式，与周围已经大量存在的长期演进技术(Long Term Evolution，LTE)基站配合使用，在热点地区和大流量地区先使用5G服务。第三代合作伙伴计划(3GPP，Third Generation Partnership Project)针对5G新空口组网定义了一种组网架构——选项3系列，在这种组网模式下，UE通过LTE接入并通过双连接技术使用5G的空口资源。双连接是指UE可以和多个系统或多个载波保持连接状态，以提升用户体验。3GPP将5G组网模式下的双连接技术定义为ENDC(E-UTRA-NR Dual Connectivity)。这种组网模式下，5G小区或称NR小区不能独立提供端到端服务，而需要依托4G小区或称LTE小区来提供服务，将这种组网模式称为NSA(Non-standalone Architecture，紧耦合架构)组网。
图1A为选项3对应的5G组网模式示意图，4G基站和5G基站都连接在4G核心网上，4G基站总是作为主基站(即MeNB)，5G基站作为从基站(即SeNB)。控制面上S1-C终结在4G基站，4G基站和5G基站之间的控制面信息通过Xx-C接口进行交互。在不同选项对应的不同组网模式下，用户面有不同的用户面协议架构，数据面无线承载可以由主基站或者从基站独立服务，也可以由主基站和从基站同时服务。
对于支持NSA模式的UE，当该UE处于5G小区的覆盖区域内时，该UE需要首先驻留在支持添加5G连接的4G小区，之后通过EN-DC的添加过程，由驻留的4G小区向该UE发送RRC连接配置信息，以指示该UE接入5G小区，获取5G服务。在本申请实施例中，将支持添加5G连接的4G小区称作支持NSA模式的4G小区。3GPP在新的标准中，对LTE小区广播的第2类系统信息块(System Information Block Type2，SIB2)增加了一个信元，用于指示当前的LTE小区是否支持EN-DC，该信元如下所示：
PLMN-Info-r15::＝SEQUENCE{
upperLayerIndication-r15，ENUMERATED{true}，OPTIONAL，--Need OR
}。
3GPP针对5G新空口(new radio，NR)组网还定义了一种组网架构，例如选项2，采用的组网模式为独立组网(standalone，SA)。NSA将NR控制面锚定于现有的4G核心网，而SA将NR的用户面和控制面独立部署于5G。本申请实施例所描述的SA和NSA均是指针对NR的组网模式。图1B为选项2对应的5G组网模式示意图，参考图1B，选项2对应的5G组网模式下，需要独立部署5G的端到端网络，新建5G基站和5G核心网，5G基站和5G核心网互联，因此，UE使用5G服务不需要先接入4G小区。
对于支持SA模式的UE，当该UE处于5G小区的覆盖区域内时，该UE可以通过以下方式接入该5G小区：
通过小区选择的过程接入5G小区；或者，驻留在支持向5G小区重选的4G小区，根据该4G小区广播的向5G小区的重选信息发起向5G小区的小区重选，从而接入5G小区。
本申请实施例中，将支持向5G小区重选的4G小区称作支持SA模式的4G小区。支持SA模式的4G小区所广播的与小区重选相关的系统信息包括第24类系统信息块(System Information Block Type24，SIB24)，SIB24携带了由4G小区重选至5G小区的重选信息， 基于UE根据SIB24携带的重选信息判定该5G小区满足重选触发条件，UE可以发起向该5G小区的小区重选。
UE接入更先进的移动通信网络，一般而言，用户体验更佳。根据运营商的不同需求，在5G的实际网络部署中，运营商可能采用NSA进行全网5G覆盖，或者，采用SA进行全网5G覆盖，或者，采用NSA或SA或NSA/SA混合组网进行5G热点覆盖。但是，无论运营商采用哪种方案进行5G覆盖，都存在5G覆盖不全或者网络优化没有到位的情况，使得UE无法接入5G小区，使用5G服务，降低用户体验。这里所说的网络优化没有到位主要指，某个区域内虽然存在5G覆盖，但是由于网络配置的问题，UE无法接入5G小区，从而无法获取5G服务，影响用户体验。
图1C示出了地面上两个相交的圆形区域(区域A和区域B)，区域A和区域B相交的区域为区域c，区域A中未与区域B相交的区域为区域a，区域B中未与区域A相交的区域为区域b。假设区域A同时被4G小区1和4G小区2覆盖，区域B被5G小区3覆盖，4G小区2既不不支持NSA模式，也不支持SA模式。下面分别以采用NSA进行5G覆盖的场景和采用SA进行5G覆盖的场景为例，对UE因网络配置问题无法接入5G小区的情况进行举例分析。
场景1、UE、4G小区1和5G小区3支持NSA模式，UE在区域A中：
1.1)假设UE驻留在4G小区1，UE位于区域c时，由于4G小区1支持NSA模式，因此UE可以通过EN-DC的添加过程接入5G小区3，获得5G服务；
1.2)假设UE驻留在4G小区2，UE位于区域c时，由于4G小区2不支持NSA模式，因此UE无法接入5G小区3，进而无法获得5G服务。
通过比较1.1)和1.2)可知，虽然UE所处的区域c存在5G覆盖，但是若UE驻留的4G小区不支持NSA模式，UE将无法接入5G小区。因此，对于支持NSA模式的UE，其处于区域c时能够获得5G服务的关键在于：UE在区域A中从4G小区1和4G小区2中选择一个小区进行驻留时，应选择支持NSA模式的4G小区1进行驻留。
场景2、UE、4G小区1和5G小区3支持SA模式，UE由区域a移动至区域c：
2.1)假设UE在区域a中驻留在4G小区1，由于4G小区1支持SA模式，因此，UE进入区域c时，UE可以根据4G小区1广播的向5G小区的重选信息发起向5G小区3的小区重选，接入5G小区3，获得5G服务；
2.2)假设UE在区域a中驻留在4G小区2，由于4G小区2不支持SA模式，UE无法获取到向5G小区的重选信息，UE无法发起向5G小区3的小区重选，进而无法获得5G服务。
通过比较2.1)和2.2)可知，虽然UE由区域a移动至存在5G覆盖的区域c，但是若UE在区域a驻留的4G小区不支持SA模式，UE在区域c将无法发起向5G小区的重选。因此，对于支持SA模式的UE，其处于区域c时能够获得5G服务的关键在于：UE在区域a中从4G小区1和4G小区2中选择一个小区进行驻留时，应选择支持SA模式的4G小区1进行驻留。
综合上述两种场景的分析，对于支持5G组网模式(例如支持NSA模式、或支持SA模式、或既支持SA模式又支持NSA模式等)的UE，在UE从多个4G小区中选择一个进行驻留时，应使UE尽量驻留在支持相应的5G组网模式的4G小区，以提高UE后续接入5G小区的成功率。
UE选择一个小区进行驻留一般有几种典型的方式：小区选择、小区重选、小区切换、重定向(Redirect)和小区改变指示(Cell Change Order)等。可见，本申请实施例中，选择一个小区进行驻留的方式包括但不限于小区选择。其中，小区切换、重定向和小区改变指示需要在网络侧的主导和调度下完成，小区选择和小区重选是UE相对自主执行的流程，本申请主要讨论小区选择和小区重选的方法。
在3GPP标准中，对UE通过小区选择和小区重选进行状态转移的流程进行了定义，图2为UE通过小区选择和小区重选进行状态转移的流程图。
一、首先对小区选择的过程进行描述：参考图2，UE选定公用陆地移动通信网(public land mobile network，PLMN)后，UE可以通过进行初始的小区选择或利用先验信息进行小区选择，来寻找适合小区。先验信息一般指UE存储的与小区选择相关的信息，例如载波频率，同时也可能包括一些小区参数信息。先验信息可以为UE中出厂预置的信息，或者为UE保存的小区选择的过程中驻留的小区的信息。若UE存储了先验信息，UE一般优先利用先验信息进行小区选择。先验信息一般包括多个载波频率，UE按照一定的搜索顺序依次在存储的多个载波频率上寻找适合小区。如果UE在存储的各个载波频率上均找不到适合小区，UE可以发起初始的小区选择。初始的小区选择指UE没有存储先验信息，UE需要根据自身能力扫描支持的频段，以便找到一个适合小区进行驻留。
现有小区选择的过程中，一般以先验信息中的各载波频率存储在UE中的先后顺序作为上述搜索顺序，越晚存储的载波频率，其在搜索顺序中的次序越靠前；或者，UE可以测量存储的各个载波频率的接收信号强度指示(received signal strength indication，RSSI)，以RSSI的大小顺序作为搜索顺序，RSSI越大的载波频率，其在搜索顺序中的次序越靠前。并且，现有小区选择的过程中，UE一旦搜索到一个适合小区，UE便会选择该小区进行驻留。
可见，现有小区选择的方法中，没有机制使UE从多个4G小区中优先选择支持NSA模式或SA模式的4G小区作为适合小区进行驻留。
本申请实施例提供的技术方案，旨在使得支持5G组网模式的UE从多个4G小区中选择一个进行驻留时，优先驻留在支持5G组网模式的4G小区，以提高UE后续接入5G小区的成功率，在5G小区的信号质量不是很差的情况下，使得UE接入5G小区，使用5G服务，提高用户体验。
本申请技术方案的一个设计思路是：设计一种小区选择方法，对于支持NSA模式的UE，使该UE优先驻留在支持NSA模式的4G小区；对于支持SA模式的UE，使该UE优先驻留在支持SA模式的4G小区。下面对本申请提供的小区选择方法进行介绍。
图3A和图3B为小区选择方法一个实施例示意图，应用于支持NSA模式的UE，UE只有通过支持NSA模式的4G小区才能使用5G服务，参考图3A，本申请小区选择方法一个实施例可以包括如下步骤：
301、读取存储的多个4G载波频率；
UE开机时，或者从RRC连接状态返回至空闲状态时，或者重新进入服务区时，若UE存储有先验信息，UE可以利用先验信息进行小区选择，小区选择一般发生在PLMN选择之后，目的时尽快选择一个满足驻留条件的小区进行驻留。UE选择PLMN之后，可以读取该PLMN下的先验信息，该先验信息包括多个4G载波频率。该先验信息可以是UE出厂时预置在UE中的， 也可以是之前保存的小区选择过程中驻留的小区的信息。
302、从多个4G载波频率中确定载波频率记录所指示的目标载波频率，载波频率记录用于指示支持NSA模式的4G小区所在的载波频率；
UE可以存储有载波频率记录，该载波频率记录用于指示支持NSA模式的4G小区所在的载波频率。在一种可能的实现方式中，UE可以保存多个载波频率记录，每个载波频率记录对应于一个PLMN，UE选择PLMN之后，可以读取该PLMN对应的载波频率记录。
UE读取多个4G载波频率后，可以从多个4G载波频率中确定载波频率记录所指示的目标载波频率，目标载波频率可以为一个，也可以为两个或两个以上。
作为举例，假设UE保存的先验信息包括5个载波频率——载波频率A、载波频率B、载波频率C、载波频率D和载波频率E，载波频率记录包括三个载波频率——载波频率D、载波频率E和载波频率F，均为支持NSA模式的4G小区所在的载波频率，那么先验信息中的5个载波频率中，载波频率记录所指示的目标载波频率为载波频率D和载波频率E，或者可以将目标载波频率理解为先验信息与载波频率记录中的公共载波频率。
303、按照目标搜索顺序在多个4G载波频率上搜索适合小区进行驻留；
本申请实施例所采用的目标搜索顺序中，目标载波频率的次序先于多个载波频率中的其他载波频率，不对多个载波频率中的其他载波频率之间的先后次序进行限定。继续沿用步骤302中的举例，目标搜索顺序中次序从先至后依次为：载波频率D、载波频率E、载波频率A、载波频率B和载波频率C。
在一种可能的实现方式中，多个载波频率中的其他载波频率的先后次序可以与其存储在UE中的先后顺序一致，对于多个载波频率中目标载波频率以外的其他载波频率，越晚存储的载波频率，其在目标搜索顺序中的次序越靠前。
或者，在一种可能的实现方式中，UE可以测量多个载波频率中各个载波频率的RSSI，多个载波频率中的其他载波频率的先后次序可以与其大小顺序一致，对于多个载波频率中目标载波频率以外的其他载波频率，RSSI越大的载波频率，其在目标搜索顺序中的次序越靠前。
示例性的，参考图3B，步骤303可以具体包括如下步骤：
3031、按照搜索顺序从多个4G载波频率中选择一个4G载波频率作为当前载波频率，目标载波频率在该搜索顺序中的次序先于多个载波频率中的其他载波频率；
3032、检测当前载波频率上的当前小区的信息；
UE可以搜索当前载波频率上的小区，称作当前小区，获取当前小区的同步信道信息，比如当前小区的标识(比如)和主扰码等，进行时隙同步和帧同步。之后，UE可以根据获取到的同步信道信息获取当前小区的广播信道上的信息，称作广播信息，并测量当前小区的信道质量。示例性的，当前小区的信道质量可以为信号与干扰加噪声比(signal to interference plus noise ratio，SINR)、参考信号接收功率(reference signal receiving power，RSRP)和参考信号接收质量(reference signal receiving quality，RSRQ)中的一种或多种。
UE获取当前小区的广播信息一般包括如下过程：
a)获取主信息块(Master Information Block，MIB)；
MIB包括当前小区中大部分SIB的参考和调度信息，MIB在广播信道上周期的发送并且其 调度是静态的。
b)获取系统信息块(System Information Blocks，SIBs)；
读到MIB后，UE可以根据MIB中的调度信息检测小区选择所需的SIBs，包括第1类系统信息块(System Information Block Type1，SIB1，获取小区选择参数，例如当前小区所在的跟踪区(tracking area，TA)、当前小区的PLMN、当前小区的标识和当前小区的最小接收电平等。
3033、根据当前小区的信息判断当前小区是否满足驻留条件，若满足，则执行步骤3034，若不满足，则执行步骤3035；
示例性的，驻留条件一般可以包括：
1)当前小区广播的SIB1中指示的PLMN是下列之一：selected PLMN或者registered PLMN或者Equivalent PLMN中的PLMN，这些信息由NAS层提供；
2)当前小区不是禁止小区；
3)当前小区所在的TA(SIB1中指示)至少有一个非禁止漫游TA；
4)当前小区的信道质量满足小区选择S准则；
具体的，UE可以根据SIB1中的小区选择参数以及UE自身的能力计算S值，判断当前小区的信道质量是否满足该S值要求，若满足，则判定当前小区的信道质量满足小区选择S准则；若不满足，则判定当前小区的信道质量不满足小区选择S准则。
一般来说，若当前小区满足上述各个驻留条件，UE可以判定当前小区满足驻留条件；若当前小区不满足上述任意一个驻留条件，UE可以判定当前小区不满足驻留条件。
3034、判定当前小区为适合小区；
若UE判定当前小区为适合小区，UE可以驻留在当前小区，进入驻留状态，或者说进入空闲状态，进行位置登记，并根据业务需要发起无线资源控制(Radio Resource Control，RRC)连接请求，向RRC连接状态迁移。
3035、判断当前载波频率是否为多个载波频率中的最后一个载波频率，若是，则执行步骤3036，若不是，则执行步骤3031；
3036、判定利用存储的多个4G载波频率未找到适合小区；
若判定在存储的多个4G载波频率上未找到适合小区，参考图2，UE可以进行初始的小区选择，根据自身能力扫描所支持的多个频段来继续搜索适合小区。
本申请实施例中，和现有技术相同的，UE在选择的当前载波频率上搜索到的当前小区满足驻留条件时，UE便判定当前小区为适合小区，驻留在当前小区；和现有技术不同的，UE读取多个载波频率后，从中找出支持NSA模式的4G小区所在的目标载波频率，并对搜索顺序进行了调整，使得目标载波频率先于其他载波频率被选作当前载波频率，若UE能够在目标载波频率上搜索到满足驻留条件的4G小区，便驻留在该4G小区，由于该4G小区很可能为支持NSA模式的4G小区，因此，本申请实施例有利于使得UE在优先驻留在支持NSA模式的4G小区。
下面以图1C的NSA部署场景为例，对图3对应的实施例与现有技术的区别进行具体介绍。
假设4G小区1对应于载波频率D，4G小区2对应于载波频率C，4G小区1和4G小区2均满足UE的驻留条件，载波频率C和载波频率D均记录在先验信息中，并且载波频率C的 RSSI高于载波频率D的RSSI。
1)若按照现有小区选择的流程，UE优先选择载波频率C作为当前载波频率，优先搜索到4G小区2，基于4G小区2满足驻留条件，UE驻留在4G小区2。由于4G小区2不支持NSA模式，UE进入区域c时，UE无法接入5G小区C。
2)若按照图3对应的实施例，假设UE保存的载波频率记录用于指示载波频率D为支持NSA模式的4G小区所在的载波频率，那么UE优先选择载波频率D作为当前载波频率，优先搜索到4G小区1，基于4G小区1满足驻留条件，UE驻留在4G小区1。由于4G小区1支持NSA模式，UE进入区域c时，UE可以经由4G小区1接入5G小区3，获得5G服务。
下面对图3A和图3B对应的实施例进行补充介绍。
1)在步骤303中，若目标载波频率的RSSI过小，表明无法在目标载波频率上搜索到小区，若仍然优先选择目标载波频率，既无法利用目标载波频率驻留在支持NSA模式的4G小区，还会降低小区选择的效率。为了在优先驻留在支持NSA模式的4G小区的前提下尽量提高小区选择的效率，在一种可能的实现方式中，UE可以为设置一个RSSI阈值，UE选择目标载波频率后，可以测量在目标载波频率的RSSI，并判断测量到的RSSI是否高于RSSI阈值，若目标载波频率的RSSI高于该RSSI阈值，则按照本申请实施例提供的目标搜索顺序在多个载波频率上搜索适合小区；若目标载波频率的RSSI不高于该RSSI阈值，则不按照本申请实施例提供的搜索顺序选择当前载波频率，例如，可以按照现有的搜索顺序从多个载波频率中选择一个载波频率作为当前载波频率。
示例性的，步骤3031可以具体包括如下步骤：
1、分别对多个载波频率的RSSI能量进行测量；
2、按照RSSI能量大小设置多个载波频率的搜索顺序；
假设搜索顺序中次序从先至后依次为：载波频率A、载波频率B、载波频率C、载波频率D和载波频率E，其中，载波频率D和E为目标载波频率。
3、若搜索顺序中目标载波频率未先于其他载波频率，则判断目标载波频率的RSSI是否高于RSSI阈值，若高于，则执行步骤3034，若不高于，则执行步骤3035；
4、调整该搜索顺序；
5、不对搜索顺序进行调整；
若载波频率D的RSSI高于RSSI阈值，载波频率E的RSSI低于RSSI阈值，则调整该搜索顺序，调整后的搜索顺序中次序从先至后依次为：载波频率D、载波频率A、载波频率B、载波频率C和载波频率E。
2)在图3B对应的实施例中，UE可能多次执行步骤3031，下面对UE执行步骤3031进行解释。
UE在小区选择过程中，需要依次在多个载波频率上搜索适合小区(即进行小区搜索和对搜索到的小区进行驻留条件的判断)。UE按照搜索顺序从多个载波频率中选择一个载波频率作为当前载波频率可以理解为，在一次小区选择的过程中，若UE首次执行步骤3031，UE可以选择搜索顺序中的第一个载波频率为当前载波频率；若UE非首次执行步骤3031，UE可以选择搜索顺序中的下一个载波频率为当前载波频率，从而逐一对多个载波频率进行小区搜索和驻留条件的判断。
示例性的，继续假设多个4G载波频率包括载波频率A、载波频率B、载波频率C、载波频率D和载波频率E，搜索顺序中次序从先至后依次为：载波频率D、载波频率A、载波频率B、载波频率C和载波频率E，下面对UE按照搜索顺序从多个载波频率中选择当前载波频率的一种具体过程进行举例介绍：在同一次小区选择的过程中，UE首次执行步骤303时，UE选择载波频率D作为当前载波频率；UE第二次执行步骤303时，UE按照搜索顺序从多个载波频率中选择载波频率D之后的载波频率A作为当前载波频率；UE第三次执行步骤303时，UE按照搜索顺序从多个载波频率中选择载波频率A之后的载波频率B作为当前载波频率。
3)步骤3036后，UE可以进行初始的小区选择，根据自身能力扫描所支持的多个频段。在一种可能的实现方式中，可以参考前述方案对初始的小区选择的现有流程进行改进，例如，UE可以存储有载波频段记录，载波频段记录用于指示支持NSA模式的4G小区所在的载波频段，UE进行初始的小区选择时，可以从支持的多个载波频段中选择载波频段记录所指示的目标载波频段，优先在目标载波频段上搜索适合小区进行驻留。
4)对步骤302中的载波频率记录进行介绍：
在一种可能的实现方式中，UE可以按现有技术在非易失型存储介质中添加驻留的4G小区的信息时，基于驻留的4G小区支持NSA模式，增加载波频率记录，以指示在当前PLMN下该4G小区对应的载波频率为支持NSA模式的4G小区所在的载波频率。在一种可能的实现方式中，UE还可以增加载波频段记录，以指示该载波频率对应的载波频段为支持NSA模式的4G小区所在的载波频段。
在一种可能的实现方式中，UE可以根据运营商提供或者厂商自行收集的信息(例如根据运营商发布标书)生成载波频率记录，或生成载波频段记录，或生成载波频率记录和载波频段记录。
图4为小区选择方法另一个实施例示意图，仍然应用于支持NSA模式的UE，参考图4，本申请小区选择方法另一个实施例可以包括如下步骤：
401、读取存储的多个4G载波频率；
402、从多个4G载波频率中确定载波频率记录所指示的目标载波频率；
403、按照目标搜索顺序从多个4G载波频率中选择一个4G载波频率作为当前载波频率；
目标载波频率在该目标搜索顺序中的次序先于多个载波频率中的其他载波频率；
步骤401至步骤403可以分别参考前述步骤301、步骤302和步骤3031进行理解，此处不再赘述。
在一种可能的实现方式中，也可以不执行步骤402，步骤403中按照现有搜索顺序(例如载波频率的保存顺序或RSSI的强度顺序)从多个4G载波频率中选择一个4G载波频率作为当前载波频率。
404、检测当前载波频率上的当前小区的信息；
405、根据当前小区的信息判断当前小区是否满足驻留条件，若满足，则执行步骤406，若不满足，则执行步骤409；
UE根据当前小区的信息判断当前小区是否满足驻留条件的方法可以参考现有小区选择的相应步骤进行理解，不同的是，现有技术中，一旦UE判定当前小区满足驻留条件，便会直接判定当前小区为适合小区进行驻留；而本申请实施例中，UE在判定当前小区满足驻留条件后， 不会直接判定当前小区为适合小区，而是会执行步骤406。
406、根据当前小区的信息判断当前小区是否支持NSA模式，若支持，则执行步骤407，若不支持，则执行步骤408；
在一种可能的实现方式中，UE可以存储小区记录，用于指示支持NSA模式的4G小区，例如，该小区记录可以包括支持NSA模式的4G小区的标识。示例性的，4G小区的标识可以包括由SIB1得到的4G小区的小区身份(CellIdentity)和PLMN身份列表(PLMN-Identity List)，那么步骤404中UE获取到的当前小区的信息可以包括当前小区的标识，如通过当前小区的SIB1中得到的CellIdentity和PLMN-Identity List，UE可以根据存储的小区记录和当前小区的标识判断当前小区是否支持NSA模式。
3GPP在新的标准中，对SIB2增加了一个信元，用于指示当前小区是否支持EN-DC，在一种可能的实现方式中，步骤404获取的当前小区的信息可以包括当前小区广播的SIB2，UE可以根据SIB2判断当前小区是否支持NSA模式。
或者，在一种可能的实现方式中，可以组合前面两种实现方式来判断当前小区是否支持NSA模式，例如，步骤404中UE可以获取当前小区广播的SIB1，得到当前小区的标识，UE可以判断当前小区的标识和存储的小区记录是否匹配，若匹配，则判定当前小区支持NSA模式，若不匹配，则UE继续获取当前小区的SIB2，根据SIB2判断当前小区是否支持NSA模式。
上述判断当前小区是否支持NSA模式的实现方式仅作为举例，在实际应用中UE还可以采用其他方式来判断当前小区是否支持NSA模式。
407、判定当前小区为适合小区；
若UE判定当前小区为适合小区，UE可以选择在当前小区进行驻留。
408、将当前小区的信息添加在候选小区记录中；
当前小区的信息包括当前小区所在的载波频率，此外，还可以包括当前小区的标识等。
409、根据搜索顺序判断当前载波频率是否为多个载波频率中最后一个载波频率，若否，则执行步骤403，若是，则执行步骤410；
基于判定当前小区不支持NSA模式，可以执行步骤408和步骤409，但是，本申请实施例不限定步骤408和步骤409的时序先后。
410、利用候选小区记录进行小区选择；
示例性的，可以在候选小区记录中的载波频率上搜索适合小区，一旦搜索到满足驻留条件的小区，则UE选择该小区作为适合小区进行驻留，若未搜索到满足驻留条件的小区，则UE可以继续进行初始的小区选择，具体过程可以参考现有利用先验信息进行小区选择的方法进行理解。
基于当前小区满足驻留条件但是不支持NSA模式，UE将当前小区的信息添加在候选小区记录中，当前载波频率为多个载波频率中最后一个载波频率时，UE利用候选小区记录进行小区选择，有利于缩短小区选择的时长，提高用户体验。需要说明的是，在一种可能的实现方式中，本申请实施例可以不执行步骤408和步骤410，若步骤406判定当前小区不支持NSA模式，UE可以执行步骤409，步骤409中，若当前载波频率为多个载波频率中的最后一个载波频率，UE可以按照现有方法利用存储的多个载波频率进行小区选择。
在一种可能的实现方式中，基于当前小区满足驻留条件但是不支持NSA模式，并且当前 载波频率为多个载波频率中的最后一个载波频率，UE可以直接选择当前小区为适合小区进行驻留，无需进行小区搜索和驻留条件的判断，有利于进一步缩短小区选择的时长，提高用户体验。
本申请实施例所体现的和现有技术的不同点主要在于：
现有技术中，UE从多个4G载波频率中依次选择一个4G载波频率作为当前载波频率，一旦当前载波频率上搜索到的当前小区满足驻留条件，UE便立即判定当前小区为适合小区进行驻留；而本申请实施例中，即使当前载波频率上搜索到的当前小区满足驻留条件，但是若其不支持NSA模式，UE可以继续从多个载波频率中选择下一个载波频率作为当前载波频率，当找到满足驻留条件并且支持NSA模式的小区时，UE便判定该小区为适合小区进行驻留，有利于使得UE在优先驻留在支持NSA模式的4G小区。
下面以图1C的NSA部署场景为例，对图4对应的实施例与现有技术的区别进行具体介绍。
假设4G小区1对应于载波频率D，4G小区2对应于载波频率C，4G小区1和4G小区2均满足UE的驻留条件，载波频率C和载波频率D均记录在先验信息中，并且载波频率C的RSSI高于载波频率D的RSSI。
1)若按照现有小区选择的流程，UE优先选择载波频率C作为当前载波频率，优先搜索到4G小区2，基于4G小区2满足驻留条件，UE驻留在4G小区2。由于4G小区2不支持NSA模式，UE进入区域c时，UE无法接入5G小区C。
2)不考虑步骤402和步骤403对载波频率次序的调整，若按照图4对应的实施例，UE优先选择载波频率C作为当前载波频率后，优先搜索到4G小区2，虽然4G小区2满足驻留条件，由于4G小区2不支持NSA模式，UE不会立即选择4G小区2为适合小区进行驻留，而是继续在载波频率D上搜索小区，从而搜索到4G小区1，在判定4G小区1满足驻留条件并且支持NSA模式的情况下，UE选择4G小区1作为适合小区进行驻留。由于4G小区1支持NSA模式，UE进入区域c时，UE可以经由4G小区1接入5G小区3，获得5G服务。
下面对图4对应的实施例进行补充介绍。
1)步骤410后，若利用候选小区记录未找到适合小区，UE可以进行初始的小区选择，根据自身能力扫描所支持的多个频段。在一种可能的实现方式中，可以参考前述方案对初始的小区选择的现有流程进行改进，例如，UE可以存储有载波频段记录，载波频段记录用于指示支持NSA模式的4G小区所在的载波频段，UE进行初始的小区选择时，可以从支持的多个频段中选择载波频段记录所指示的目标载波频段，优先搜索目标载波频段。
2)对步骤406的实现方式中提到的小区记录进行介绍：
在一种可能的实现方式中，基于驻留的4G小区支持NSA模式，UE可以存储当前小区的信息，将存储的内容称作小区记录，小区记录可以包括当前PLMN、当前载波频率和当前小区的标识，以指示在当前PLMN和当前载波频率下的该标识对应的小区支持NSA模式。
为了节约存储资源，在一种可能的实现方式中，UE可以根据老化策略删除部分小区记录，例如，可以删除保存时间超过一定时长的小区记录。
3)在一种可能的实现方式中，步骤406可以在步骤405之前执行，此时，在步骤406中，若判定当前小区不支持NSA模式，则执行步骤409，若支持NSA模式，则执行步骤405；在步骤405中，若当前小区满足驻留条件，则执行步骤407，若当前小区不满足驻留条件，则执 行步骤409。可见，在这种实现方式中，无需执行步骤408，并且步骤410中，UE利用先验信息进行小区选择，由于UE无法利用候选小区记录进行小区选择，而是需要利用所有先验信息进行小区选择，因此不利于小区选择时长的控制。
对于支持SA模式的UE所进行的小区选择方法可以参考前述图3A、图3B和图4对应的实施例进行理解。作为举例，图5为小区选择方法另一个实施例示意图，应用于支持SA模式的UE，UE在小区重选时需要通过支持SA模式的4G小区才能重选至5G小区，使用5G服务，参考图5，本申请小区选择方法另一个实施例可以包括如下步骤：
501、读取存储的多个4G载波频率；
502、从多个4G载波频率中确定载波频率记录所指示的目标载波频率，载波频率记录用于指示支持SA模式的4G小区所在的载波频率；
503、按照搜索顺序从多个4G载波频率中选择一个4G载波频率作为当前载波频率，目标载波频率在该搜索顺序中的次序先于多个载波频率中的其他载波频率；
504、检测当前载波频率上的当前小区的信息；
505、根据当前小区的信息判断当前小区是否满足驻留条件，若满足，则执行步骤506，若不满足，则执行步骤509；
506、根据当前小区的信息判断当前小区是否支持SA模式，若支持，则执行步骤507，若不支持，则执行步骤508；
507、判定当前小区为适合小区；
508、将当前小区的信息添加在候选小区记录中；
509、根据搜索顺序判断当前载波频率是否为多个载波频率中最后一个载波频率，若否，则执行步骤503，若是，则执行步骤510；
510、利用候选小区记录进行小区选择；
图5对应的实施例与图4对应的实施例的设计思路相似，区别主要是由SA模式和NSA模式的区别引起的，例如，步骤502中选用的载波频率记录用于指示支持SA模式的4G小区所在的载波频率，而不是用于指示支持NSA模式的4G小区所在的载波频率；例如，步骤506中，UE根据当前小区的信息来判断当前小区是否支持SA模式，而不是判断当前小区是否支持NSA模式。步骤501至步骤510中上述区别以外的部分以及有益效果，可以参考图4对应的实施例相应描述进行理解，此处不再赘述。
下面对步骤506中UE根据当前小区的信息判断当前小区是否支持SA模式的方法进行介绍：
在一种可能的实现方式中，UE可以存储小区记录，用于指示支持SA模式的4G小区的信息，4G小区的信息可以包括4G小区的标识。示例性的，4G小区的标识可以包括由SIB1得到的4G小区的小区身份(CellIdentity)和PLMN身份列表(PLMN-Identity List)，步骤504中获取到的当前小区的信息可以包括当前小区的标识，UE可以根据存储的小区记录和当前小区的标识判断当前小区是否支持SA模式。
或者，在一种可能的实现方式中，UE可以获取当前小区的系统信息，根据系统信息判断当前小区是否支持SA模式。SIB1一般携带对其他系统信息块的调度信息，若当前小区支持向5G小区重选，那么SIB1将携带对SIB24的调度信息，因此，UE可以获取当前小区的SIB1， 若SIB1中包括对SIB24的调度信息，则可以判定当前小区支持SA模式，反之，若SIB1未包括对SIB24的调度信息，则可以判定当前小区不支持SA模式。
二、下面对小区重选的过程进行描述：
继续参考图2，UE在空闲状态下，可以监测驻留小区和邻区的信号质量，以选择一个能够提供更优服务的小区的过程。小区重选在移动通信网络中是由标准定义的行为，参考图6，现有小区重选的过程一般包括如下步骤：
601、在空闲状态下，获取驻留的第一小区广播的重选信息，并测量第一小区和第一小区的各邻区的信号质量；
602、根据重选信息和测量的信号质量判断各邻区中是否存在满足小区重选的触发条件的目标邻区，若满足，则执行步骤603，若不满足，则执行步骤604；
603、发起向目标邻区的小区重选；
604、继续驻留在第一小区。
现有小区重选的触发条件主要包括：1、驻留小区的信号质量；2、邻区的质量或能量；3、邻区和当前小区的重选优先级；4、重选参数，例如信号质量的阈值。
由上述现有的小区重选方法可以看出，现有的小区重选的流程中，没有机制使UE优先向支持NSA模式或SA模式的4G小区发起小区重选。
本申请实施例提供的技术方案，旨在使得支持5G组网模式的UE从多个4G小区中选择一个进行驻留时，优先驻留在支持5G组网模式的4G小区，以提高UE后续接入5G小区的成功率，在5G小区的信号质量不是很差的情况下，使得UE接入5G小区，使用5G服务，提高用户体验。
本申请技术方案的另一个设计思路是：设计一种小区重选方法，对于支持NSA模式的UE，当该UE驻留在不支持NSA模式的4G小区时，增加向支持NSA模式的4G小区发起小区重选的触发条件，增加UE驻留在支持NSA模式的4G小区的几率，从而提高UE接入5G小区的成功率；对于支持SA模式的UE，当该UE驻留在不支持SA模式的4G小区时，增加向支持SA模式的4G小区发起小区重选的触发条件，增加UE驻留在支持SA模式的4G小区的几率，从而提高UE接入5G小区的成功率。下面对本申请提供的小区选择方法进行介绍。
图7为小区重选方法一个实施例示意图，应用于支持NSA模式的UE，UE只有通过支持NSA模式的4G小区才能使用5G服务，参考图7，本申请小区重选方法一个实施例可以包括如下步骤：
701、在空闲状态下，基于驻留的第一4G小区不支持NSA模式，进行小区搜索；
702、判断搜索到的第二4G小区是否支持NSA模式，基于支持，则执行步骤703，基于不支持，则执行步骤704；
UE判断第一小区和第二4G小区是否支持NSA模式的方法可以参考前述实施例中的相应介绍，例如步骤406中的相关描述，此处不再赘述。
703、发起向第二4G小区的小区重选；
704、执行其他操作。
下面以图1C的NSA部署场景为例，对图7对应的实施例与现有技术的区别进行具体介绍。
假设支持NSA模式的UE在区域a中驻留在4G小区2，并且UE检测到的4G小区2的信号质量优于4G小区1的信号质量。
1)若按照现有小区重选的流程，4G小区1不满足小区重选的现有触发条件，UE不会发起向4G小区1的小区重选，继续驻留在4G小区2，当UE进入区域c时，将难以接入支持NSA模式或SA模式的5G小区3；
2)若按照图7对应的实施例，虽然4G小区1不满足小区重选的现有触发条件，但是由于4G小区1支持NSA模式，因此UE仍然可以发起向4G小区1的小区重选，由于4G小区1支持NSA模式，UE进入区域c时，UE可以经由4G小区1接入5G小区3，获得5G服务。
下面对图7对应的实施例进行补充介绍。
1)对于采用不连续接收(discontinuous reception，DRX)的UE，其在没有数据传输的时候，可以通过关闭其接收电路来降低功耗，从而提升其电池的使用时间。DRX的基本机制是为配置DRX周期，每个DRX周期包括激活期和休眠期。在DRX的激活期，UE通常按照计算的寻呼时刻唤醒并监听第一4G小区的寻呼消息，进行小区重选的触发条件的评估；完成激活期任务后，UE进入DRX的休眠期，不接受下行信道的数据以降低功耗。在一种可能的实现方式中，为了不影响UE在现有激活期需要完成的任务，UE可以在完成激活期任务后、在下一个DRX激活期到来前，执行本申请实施例提供的小区重选方法，或者理解为，UE可以在现有DRX周期中的DRX休眠期执行本实施例提供的小区重选方法。
2)为了避免因频繁执行图7对应的实施例流程而导致UE在空闲状态的功耗损失，在一种可能的实现方式中，UE驻留的小区不变时，可以只执行一次图7对应的实施例流程。或者，在一种可能的实现方式中，可设计一定时器机制，定时器的时长可以是固定的，也可以逐渐延长，示例性的，步骤705后，可以开启定时器，再次启动图7对应的实施例流程需要间隔时长T，若未发起小区重选，再次启动定时器，并延长定时器的时长，例如增加到2T，依次类推。
3)若第二4G小区支持NSA模式，但是其信号质量过差，将无法为UE提供基本的通信服务，为此，在一种可能的实现方式中，步骤703之前，本申请实施例中，UE设置信号质量阈值，并测量第二4G小区的信号质量，基于第二4G小区的信号质量优于信号质量阈值，并且第二4G小区支持NSA模式，UE可以发起向第二4G小区的小区重选。
4)在一种可能的实现方式中，步骤701中，UE可以根据第一4G小区广播的邻区信息进行小区搜索，或者，在一种可能的实现方式中，UE可以根据预先存储的先验信息进行小区搜索。
UE可以根据存储先验信息来检测第二4G小区的信息，下面以第二4G小区可以为UE存储的先验信息中4G载波频率上的4G小区为例，介绍本申请小区重选方法另一个实施例。
图8为小区重选方法另一个实施例示意图，应用于支持NSA模式的UE，UE只有通过支持NSA模式的4G小区才能使用5G服务，参考图8，本申请小区重选方法另一个实施例可以包括如下步骤：
801、在空闲状态下，基于驻留的第一4G小区不支持NSA模式，读取存储的多个4G载波频率；
802、从多个4G载波频率中确定载波频率记录所指示的目标载波频率；
载波频率记录用于指示支持NSA模式的4G小区所在的载波频率；
803、按照搜索顺序从多个4G载波频率中选择一个4G载波频率作为当前载波频率，目标载波频率在该搜索顺序中的次序先于多个载波频率中的其他载波频率；
804、检测当前载波频率上的当前小区的信息；
805、根据当前小区的信息判断当前小区的信号质量是否优于信号质量阈值，若是，则执行步骤806，若不高于，则执行步骤808；
806、根据当前小区的信息判断当前小区是否支持NSA模式，若支持，则执行步骤807，若不满足，则执行步骤808；
807、发起向当前小区的小区重选；
808、判断当前载波频率是否为多个载波频率中的最后一个载波频率，若是，则执行步骤809，若不是，则执行步骤803；
809、执行其他操作；
步骤804中UE获取到的当前小区的信息主要用于执行步骤805和步骤806，UE可以根据步骤805和步骤806所需的信息执行步骤804。
图8对应的实施例中各步骤的描述可以参考前述方法实施例的相关步骤的描述，此处不再赘述。
前面通过图7和图8对应的实施例介绍了支持NSA模式的UE通过小区重选接入支持NSA模式的4G小区的方法，对于支持SA模式的UE，可以通过与图7或图8对应的实施例相似的方法通过小区重选接入支持SA模式的4G小区，本领域技术人员通过图7和图8的实施例描述能够想到，如何使支持SA模式的UE通过小区重选接入支持SA模式的4G小区，此处不再赘述。
为了提升用户接入5G小区的成功率，在5G小区的信号质量不是很差的情况下，接入5G小区，本申请技术方案另一个设计思路是：设计另一种小区重选方法，对于支持SA模式的UE，当该UE驻留在不支持SA模式的4G小区时，提供UE向支持SA模式的5G小区发起小区重选的方法，从而提高UE接入5G小区的成功率。下面对本申请提供的小区重选方法另一实施例进行介绍。
图9是小区重选方法另一个实施例示意图，应用于支持SA模式的UE，参考图9，本申请小区重选方法另一个实施例可以包括如下步骤：
901、在空闲状态下，基于驻留的4G小区不支持SA模式，检测5G小区的信息；
在空闲状态下，基于驻留的4G小区不支持SA模式，支持SA模式的UE可以选择5G频点，搜索5G频点上的5G小区，检测该5G小区的信息，例如5G小区的信道质量。
UE判断驻留的4G小区是否支持SA模式的方法可以参考前述实施例中的相应介绍，例如步骤506的相关描述，此处不再赘述。
902、根据5G小区的信息判断该5G小区是否满足预设的小区重选的触发条件，若满足，则执行步骤903，若不满足，则执行步骤904；
由于当前驻留的4G小区不支持SA模式，因此其广播的系统消息中未配置向5G小区的小区重选的触发条件，在本申请实施例中，UE可以自定义向5G小区发起小区重选的触发条件， 示例性的，该触发条件可以包括5G小区的信道质量阈值。
903、发起向该5G小区的重选；
904、执行其他操作。
下面以图1C的SA部署场景为例，对图9对应的实施例与现有技术的区别进行具体介绍。
假设支持SA模式的UE在区域a中驻留在4G小区2，UE移动至区域c，UE在区域c中检测到的5G小区3的信道质量较高。
1)若按照现有小区重选的流程，4G小区2不支持SA模式，广播信息不包括向5G小区的重选信息，例如，不包括SIB24，UE在区域c无法发起向5G小区3的小区重选，因此无法获得5G服务；
2)若按照图9对应的实施例，虽然4G小区2不支持SA模式，广播信息不包括向5G小区的重选信息，UE在判定驻留的4G小区不支持SA模式后，可以搜索到5G小区3，若5G小区3的信道质量优于UE预设的信道质量阈值，UE可以发起向5G小区3的小区重选，接入5G小区3，获得5G服务。
下面对图9对应的实施例进行补充介绍。
1)UE通常按照计算的寻呼时刻唤醒并监听4G小区的寻呼消息，进行小区重选的触发条件的评估，之后进入休眠状态以省电。在一种可能的实现方式中，为了不影响UE监听4G小区广播的寻呼消息，UE可以在寻呼间隙执行本实施例方法，例如，在完成现有的小区重选的触发条件的评估且未发现满足触发条件的邻区后，执行本申请实施例流程。步骤904中UE可以进入休眠状态。
2)为了避免因频繁执行图9对应的实施例流程而导致UE在空闲状态的功耗损失，在一种可能的实现方式中，UE驻留的小区不变时，可以只执行一次图9对应的实施例流程。或者，在一种可能的实现方式中，可设计一定时器机制，定时器的时长可以是固定的，也可以逐渐延长，示例性的，步骤905后，可以开启定时器，再次启动图9对应的实施例流程需要间隔时长T，若未发起小区重选，再次启动定时器，并延长定时器的时长，例如增加到2T，依次类推。
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
可以理解的是，UE或UE内的芯片为了实现上述功能，包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的功能，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
从功能模块的角度，本领域技术人员可以根据上述方法实施例对UE或UE内的芯片进行 功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个功能模块中。上述集成的功能模块既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
例如，以采用集成的方式划分各个功能单元的情况下，图10示出了一种接入控制装置的结构示意图。如图10所示，接入控制装置1000可以包括：收发模块1001和处理模块1002。
在接入控制装置1000的一个实施例种，收发模块1001用于在长期演进技术LTE的频点上进行小区选择的过程中，先在第一频点进行小区搜索，所述第一频点的小区支持第5代移动通信技术5G组网模式下的双连接技术ENDC；处理模块1002，用于若所述第一频点可以驻留，则驻留在所述第一频点。
在一种可能的实现方式中，所述第一频点为终端已存储的历史频点或对应于已存储的历史频段，并且所述终端曾经通过驻留在所述历史频点或所述历史频段上的LTE小区接入5G小区。
在一种可能的实现方式中，所述第一频点为5G非独立NSA组网的锚点频点，或对应于5G NSA组网的锚点频段。
在一种可能的实现方式中，所述锚点频点或所述锚点频段记录在运营商发布的标书中。
在一种可能的实现方式中，所述锚点频点或所述锚点频段为终端的厂商推送的。
在一种可能的实现方式中，所述收发模块1001还用于，若所述第一频点不可以驻留，则在第二频点进行小区搜索，所述第二频点的小区不支持ENDC；所述处理模块1002还用于，若所述第二频点可以驻留，则驻留在所述第二频点。
在一种可能的实现方式中，终端检测到的所述第二频点的接收信号强度高于所述第一频点的接收信号强度。
在一种可能的实现方式中，所述收发模块1001还用于，驻留在所述第二频点的过程中，在空闲状态下，进行小区搜索；所述处理模块1002还用于，若搜索到支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。
在一种可能的实现方式中，所述收发模块1001具体用于，在不连续接收周期的休眠期进行小区搜索。
在一种可能的实现方式中，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
在一种可能的实现方式中，所述收发模块1001具体用于，在5G的频点上进行小区搜索；所述支持5G组网模式的小区为5G小区。
在一种可能的实现方式中，所述收发模块1001具体用于，在LTE的频点上进行小区搜索；所述支持5G组网模式的小区为支持ENDC的LTE小区。
在一种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
在一种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
在接入控制装置1000的另一个实施例中，收发模块1001用于，若驻留在不支持5G组网模式的LTE小区，在空闲状态下，可以进行小区搜索；处理模块1002用于，若搜索到支持5G组网模式的小区，可以向该搜索到的支持5G组网模式的小区发起小区重选，通过在现有 重选触发条件的基础上增加向支持5G组网模式的小区的重选触发条件，有利于帮助终端通过小区重选接入支持5G组网模式的小区，提高终端接入5G小区的成功率，提高用户体验。
在一种可能的实现方式中，所述收发模块1001具体用于，在不连续接收周期的休眠期进行小区搜索。
在一种可能的实现方式中，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
在一种可能的实现方式中，在本申请第四方面的第三种可能的实现方式中，所述收发模块1001具体用于，在5G的频点上进行小区搜索；所述支持5G组网模式的小区为5G小区。
在一种可能的实现方式中，所述收发模块1001具体用于，在LTE的频点上进行小区搜索；所述支持5G组网模式的小区为支持ENDC的LTE小区。
在一种可能的实现方式中，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
在一种可能的实现方式中，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
一个示例中，接入控制装置1000可以为计算机设备，具体可以为终端设备，接入控制装置1000中的处理模块可以例如是处理器，收发模块可以例如是收发器，该收发器可以包括射频电路。可选地，该接入控制装置1000还可以包括存储器。该存储器用于存储计算机指令，该处理模块与该存储器连接，该处理模块执行该存储器存储的计算机指令，以使接入控制装置1000执行上述实施例方法。计算机设备中的处理器，可对信号进行基带处理和射频处理，收发器，例如天线，可进行信号的接收和发送。
参考图11，为本申请提供的计算机设备1100的一个示意图，接入控制装置1000可以为图11所示的计算机设备1100。该计算机设备可以包括：处理器射频(radio frequency，RF)电路1110、存储器1120、输入单元1130、显示单元1140、传感器1150、音频电路1160、无线保真(wireless fidelity，WiFi)模块1170、处理器1180、以及电源1190等部件。
本领域技术人员可以理解，图11中示出的计算机设备结构并不构成对计算机设备的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
下面结合图11对计算机设备1100的各个构成部件进行具体的介绍：
RF电路1110可用于收发信息或通话过程中，信号的接收和发送，特别地，将网络侧设备的下行信息接收后，给处理器1180处理；另外，将设计上行的数据发送给网络侧设备。
通常，RF电路1110包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器(low noise amplifier，LNA)、双工器等。
此外，RF电路1110还可以通过无线通信与网络和其他设备通信。
上述无线通信可以使用任一通信标准或协议，包括但不限于全球移动通讯系统(global system of mobile communication，GSM)、通用分组无线服务(general packet radio service，GPRS)、码分多址(code division multiple access，CDMA)、宽带码分多址(wideband code division multiple access,WCDMA)、长期演进(long term evolution，LTE)、电子邮件、短消息服务(short messaging service，SMS)等。
存储器1120可用于存储软件程序以及模块，处理器1180通过运行存储在存储器1120的 软件程序以及模块，从而执行计算机设备的各种功能应用以及数据处理。
存储器1120可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据计算机设备的使用所创建的数据等。此外，存储器1120可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
输入单元1130可用于接收输入的数字或字符信息，以及产生与计算机设备的用户设置以及功能控制有关的键信号输入。
具体地，输入单元1130可包括触控面板1131以及其他输入设备1132。触控面板1131，也称为触摸屏，可收集用户在其上或附近的触摸操作(比如用户使用手指、触笔等任何适合的物体或附件在触控面板1131上或在触控面板1131附近的操作)，并根据预先设定的程式驱动相应的连接装置。除了触控面板1131，输入单元1130还可以包括其他输入设备1132。具体地，其他输入设备1132可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元1140可用于显示由用户输入的信息或提供给用户的信息以及计算机设备的各种菜单。显示单元1140可包括显示面板1141，可选的，可以采用液晶显示器(liquid crystal display，LCD)、有机发光二极管(organic light-emitting diode,OLED)等形式来配置显示面板1141。进一步的，触控面板1131可覆盖显示面板1141，当触控面板1131检测到在其上或附近的触摸操作后，传送给处理器1180以确定触摸事件的类型，随后处理器1180根据触摸事件的类型在显示面板1141上提供相应的视觉输出。虽然在图11中，触控面板1131与显示面板1141是作为两个独立的部件来实现计算机设备的输入和输入功能，但是在某些实施例中，可以将触控面板1131与显示面板1141集成而实现计算机设备的输入和输出功能。
计算机设备还可包括至少一种传感器1150，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板1141的亮度，接近传感器可在计算机设备移动到耳边时，关闭显示面板1141和/或背光。作为运动传感器的一种，加速计传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别计算机设备姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；至于计算机设备还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
扬声器1161和传声器1162可提供用户与计算机设备之间的音频接口。音频电路1160可将接收到的音频数据转换后的电信号，传输到扬声器1161，由扬声器1161转换为声音信号输出；另一方面，传声器1162将收集的声音信号转换为电信号，由音频电路1160接收后转换为音频数据，再将音频数据输出处理器1180处理后，经RF电路1110以发送给比如另一设备，或者将音频数据输出至存储器1120以便进一步处理。
WiFi属于短距离无线传输技术，计算机设备通过WiFi模块1170可以帮助用户收发电子邮件、浏览网页和访问流式媒体等，它为用户提供了无线的宽带互联网访问。虽然图11示出了WiFi模块1170，但是可以理解的是，其并不属于计算机设备的必须构成，完全可以根据 需要在不改变发明的本质的范围内而省略。
处理器1180是计算机设备的控制中心，利用各种接口和线路连接整个计算机设备的各个部分，通过运行或执行存储在存储器1120内的软件程序和/或模块，以及调用存储在存储器1120内的数据，执行计算机设备的各种功能和处理数据，从而对计算机设备进行整体监控。处理器1180可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。虽然图中仅仅示出了一个处理器，该装置可以包括多个处理器或者处理器包括多个处理单元。具体的，处理器1180可以是一个单核处理器，也可以是一个多核或众核处理器。该处理器1180可以是ARM架构处理器。可选的，处理器1180可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器1180中。
计算机设备还包括给各个部件供电的电源1190(比如电池)，优选的，电源1190可以通过电源管理系统与处理器1180逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。
尽管未示出，计算机设备还可以包括摄像头、蓝牙模块等，在此不再赘述。
本申请实施例提供的计算机设备可以为手机、平板电脑、台式电脑、可穿戴设备(例如智能手表)、智能家庭设备(例如智能音响或智能电视)、车载智能设备、无人驾驶设备、虚拟现实设备、增强现实设备、混合现实设备、以及人工智能设备等。
一个示例中，该接入控制装置1000可以为计算机设备中的芯片，则该芯片包括处理模块1002和收发模块1001。收发模块1001可以由收发器实现，处理模块1002可以由处理器实现。所述收发模块1001例如可以是输入/输出接口、管脚或电路等。该处理模块1002可执行存储单元存储的计算机执行指令。存储器为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述计算机设备内的位于所述芯片外部的存储单元，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
在使用硬件实现时，可以由多个处理芯片分别完成其中一个模块的功能，也可以使用一个芯片完成其中多个模块的功能。实际应用中，出于成本、性能、技术等因素的考虑，一般会用一个芯片实现多个模块的功能，芯片类型可以是CPU、DSP、FPGA或者具有类似功能的芯片。
上述实施例，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现，当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。
所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机执行指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换，这仅仅是描述本申请的实施例中对相同属性的对象在描述时所采用的区分方式。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，以便包含一系列单元的过程、方法、系统、产品或设备不必限于那些单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它单元。在本申请实施例中，“多个”指两个或两个以上。
本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
在本申请的各实施例中，为了方面理解，进行了多种举例说明。然而，这些例子仅仅是一些举例，并不意味着是实现本申请的最佳实现方式。
以上对本申请所提供的技术方案进行了详细介绍，本申请中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (31)

  1. 一种接入控制方法，其特征在于，包括：
    在长期演进技术LTE的频点上进行小区选择的过程中，先在第一频点进行小区搜索，所述第一频点的小区支持第5代移动通信技术5G组网模式下的双连接技术ENDC；
    若所述第一频点可以驻留，则驻留在所述第一频点。
  2. 根据权利要求1所述的方法，其特征在于，所述第一频点为终端已存储的历史频点或对应于已存储的历史频段，并且所述终端曾经通过驻留在所述历史频点或所述历史频段上的LTE小区接入5G小区。
  3. 根据权利要求1所述的方法，其特征在于，所述第一频点为5G非独立NSA组网的锚点频点，或对应于5G NSA组网的锚点频段。
  4. 根据权利要求3所述的方法，其特征在于，所述锚点频点或所述锚点频段记录在运营商发布的标书中。
  5. 根据权利要求3所述的方法，其特征在于，所述锚点频点或所述锚点频段为终端的厂商推送的。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    若所述第一频点不可以驻留，则在第二频点进行小区搜索，所述第二频点的小区不支持ENDC；
    若所述第二频点可以驻留，则驻留在所述第二频点。
  7. 根据权利要求6所述的方法，其特征在于，终端检测到的所述第二频点的接收信号强度高于所述第一频点的接收信号强度。
  8. 根据权利要求6所述的方法，其特征在于，所述驻留在所述第二频点，包括：
    在空闲状态下，进行小区搜索；
    若搜索到支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。
  9. 根据权利要求8所述的方法，其特征在于，所述进行小区搜索，包括：
    在不连续接收周期的休眠期进行小区搜索。
  10. 根据权利要求8所述的方法，其特征在于，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
  11. 根据权利要求8至10中任一项所述的方法，其特征在于，所述进行小区搜索，包括：
    在5G的频点上进行小区搜索；
    所述支持5G组网模式的小区为5G小区。
  12. 根据权利要求8至10中任一项所述的方法，其特征在于，所述进行小区搜索，包括：
    在LTE的频点上进行小区搜索；
    所述支持5G组网模式的小区为支持ENDC的LTE小区。
  13. 根据权利要求12所述的方法，其特征在于，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
  14. 根据权利要求12所述的方法，其特征在于，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
  15. 一种接入控制装置，其特征在于，包括：
    收发模块，用于在长期演进技术LTE的频点上进行小区选择的过程中，先在第一频点进行小区搜索，所述第一频点的小区支持第5代移动通信技术5G组网模式下的双连接技术ENDC；
    处理模块，用于若所述第一频点可以驻留，则驻留在所述第一频点。
  16. 根据权利要求15所述的装置，其特征在于，所述第一频点为终端已存储的历史频点或对应于已存储的历史频段，并且所述终端曾经通过驻留在所述历史频点或所述历史频段上的LTE小区接入5G小区。
  17. 根据权利要求15所述的装置，其特征在于，所述第一频点为5G非独立NSA组网的锚点频点，或对应于5G NSA组网的锚点频段。
  18. 根据权利要求17所述的装置，其特征在于，所述锚点频点或所述锚点频段记录在运营商发布的标书中。
  19. 根据权利要求17所述的装置，其特征在于，所述锚点频点或所述锚点频段为终端的厂商推送的。
  20. 根据权利要求15至19中任一项所述的装置，其特征在于，所述收发模块还用于，若所述第一频点不可以驻留，则在第二频点进行小区搜索，所述第二频点的小区不支持ENDC；
    所述处理模块还用于，若所述第二频点可以驻留，则驻留在所述第二频点。
  21. 根据权利要求20所述的装置，其特征在于，终端检测到的所述第二频点的接收信号强度高于所述第一频点的接收信号强度。
  22. 根据权利要求20所述的装置，其特征在于，所述收发模块还用于，驻留在所述第二频点的过程中，在空闲状态下，进行小区搜索；
    所述处理模块还用于，若搜索到支持5G组网模式的小区，则向所述支持5G组网模式的小区发起小区重选。
  23. 根据权利要求22所述的装置，其特征在于，所述收发模块具体用于，在不连续接收周期的休眠期进行小区搜索。
  24. 根据权利要求22所述的装置，其特征在于，所述支持5G组网模式的小区的信道质量优于信道质量阈值。
  25. 根据权利要求22至24中任一项所述的装置，其特征在于，所述收发模块具体用于，在5G的频点上进行小区搜索；
    所述支持5G组网模式的小区为5G小区。
  26. 根据权利要求22至24中任一项所述的装置，其特征在于，所述收发模块具体用于，在LTE的频点上进行小区搜索；
    所述支持5G组网模式的小区为支持ENDC的LTE小区。
  27. 根据权利要求26所述的装置，其特征在于，所述支持ENDC的LTE小区广播的系统信息携带用于指示支持ENDC的信元。
  28. 根据权利要求26所述的装置，其特征在于，所述支持ENDC的LTE小区的唯一标识存储在终端的存储介质中，并且所述终端曾经通过驻留在所述支持ENDC的LTE小区接入5G小区。
  29. 一种计算机设备，其特征在于，包括处理器和存储器，所述处理器在运行所述存储器存储的计算机指令时，执行如权利要求1至14中任一项所述的方法。
  30. 一种计算机可读存储介质，其特征在于，包括指令，当所述指令在计算机上运行时，使得计算机执行如权利要求1至14中任一项所述的方法。
  31. 一种计算机程序产品，其特征在于，包括指令，当所述指令在计算机上运行时，使得计算机执行如权利要求1至14中任一项所述的方法。
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