WO2020216167A1 - 小区选择的方法、小区重选的方法和芯片 - Google Patents

小区选择的方法、小区重选的方法和芯片 Download PDF

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Publication number
WO2020216167A1
WO2020216167A1 PCT/CN2020/085554 CN2020085554W WO2020216167A1 WO 2020216167 A1 WO2020216167 A1 WO 2020216167A1 CN 2020085554 W CN2020085554 W CN 2020085554W WO 2020216167 A1 WO2020216167 A1 WO 2020216167A1
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Prior art keywords
cell
candidate cell
terminal device
candidate
information
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PCT/CN2020/085554
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English (en)
French (fr)
Inventor
李勇
侯志远
Original Assignee
华为技术有限公司
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Priority claimed from CN201910651489.1A external-priority patent/CN111866972B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20794364.8A priority Critical patent/EP3952445A4/en
Priority to US17/594,493 priority patent/US12101675B2/en
Publication of WO2020216167A1 publication Critical patent/WO2020216167A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • This application relates to the field of communications, in particular to a method for cell selection, a method for cell reselection, and a chip.
  • the terminal device After the terminal device is turned on, it needs to perform the public land mobile network (PLMN) selection and cell selection process, and then reside and register in the selected cell to enjoy network services.
  • PLMN public land mobile network
  • the non-access stratum (NAS) of the terminal device first performs public land mobile network (PLMN) selection.
  • PLMN public land mobile network
  • RAT radio access technology
  • AS access stratum
  • the terminal device searches for a cell that meets the preset conditions and resides in the selected cell.
  • the conditions for selecting a cell mainly include information such as cell parameter information and cell measurement results, but the information considered in the above method of selecting a cell is not comprehensive, resulting in poor communication quality of the cell where the terminal device resides and poor user experience. .
  • This application provides a cell selection method, cell reselection method, terminal equipment and chip, which can improve user experience.
  • a method for cell selection including: a terminal device searches for a first candidate cell; the terminal device receives a system message of the first candidate cell, and the system message of the first candidate cell includes an indication Information of the following content: the PLMN of the first candidate cell is the PLMN selected by NAS, or the PLMN of the first candidate cell is a registered PLMN, or the PLMN of the first candidate cell is in the equivalent PLMN list PLMN; the first candidate cell is a cell that is not barred; the TAI of the first candidate cell is not a TAI in the roaming prohibited tracking area list; parameter information of the first candidate cell; the first candidate cell
  • the bandwidth information is used to indicate the bandwidth of the first candidate cell; the terminal device determines the cell selection reception of the first candidate cell according to the cell measurement value and the parameter information of the first candidate cell Rank value Srxlev and cell selection quality value Squal, and determine Srxlev>0, Squal>0; when the bandwidth of the first candidate cell is greater than the
  • the terminal device considers the factor of the cell bandwidth during the cell selection process, so that when the terminal device selects the cell to camp on, it can preferentially select a cell with a bandwidth greater than a preset threshold, thereby ensuring that it will not be due to bandwidth. The reason causes the data transmission rate to decrease, thereby improving the user experience.
  • the method further includes: when the bandwidth of the first candidate cell is less than or equal to the preset threshold, the terminal device does not reside in the first candidate cell.
  • the bandwidth of the first candidate cell is less than or equal to the preset threshold, the terminal device does not reside in the first candidate cell.
  • Candidate cell when the bandwidth of the first candidate cell is less than or equal to the preset threshold, the terminal device does not reside in the first candidate cell.
  • the terminal device if the bandwidth of the candidate cell is less than or equal to the preset threshold, the terminal device does not camp on the candidate cell, so as to continue to search for cells with a bandwidth greater than the preset threshold, thereby ensuring that the bandwidth will not be caused As a result, the data transmission rate is reduced and the user experience is improved.
  • the method further includes: in the case that the bandwidths of all candidate cells that meet the first preset condition searched by the terminal device are less than or equal to the preset threshold, The terminal device determines a cell to camp on among candidate cells that meet a first preset condition; the first preset condition includes: the PLMN of the candidate cell is the PLMN selected by NAS, or the PLMN of the candidate cell is The registered PLMN, or the PLMN of the candidate cell is a PLMN in the equivalent PLMN list; the candidate cell is a cell that is not barred; the TAI of the candidate cell is not a TAI in the list of tracking areas where roaming is prohibited; Srxlev >0, and Squal>0.
  • the terminal device selects a cell to camp on among the searched cells to ensure that the terminal device can Stay in the cell smoothly to improve user experience.
  • the method further includes: in a case where the bandwidth of the first candidate cell is less than or equal to a preset threshold, the terminal device marks the first candidate cell as the current The cell with the lowest priority in the radio access technology RAT, or the cell with the lowest priority in all RATs supported by the terminal device.
  • the priority information can be referenced locally to reside in Cells with bandwidth greater than the preset threshold improve user experience.
  • the search for the first candidate cell by the terminal device includes: in a case where a priori message is stored locally, the terminal device searches for the For the first candidate cell, the a priori message is used to indicate cell information of the historical camping cell.
  • searching for the first candidate cell by the terminal device further includes: in the case where the first candidate cell is not found according to the a priori message, the terminal device passes The full frequency band search determines the first candidate cell.
  • the search for the first candidate cell by the terminal device includes: in the case that no a priori message is stored locally, the terminal device searches for the first candidate cell in the full frequency band. For candidate cells, the a priori message is used to indicate cell information of the historical camping cell.
  • a method for cell reselection including: a terminal device receives a system message of a serving cell where it resides, the system message includes neighboring cell information, and the neighboring cell information includes information about the first candidate cell. Priority information and parameter information; the terminal device determines that the first candidate cell satisfies the cell reselection condition according to the priority information and parameter information of the first candidate cell; the terminal device receives the first candidate cell
  • the system message of the first candidate cell includes the bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the bandwidth of the first candidate cell; the bandwidth of the first candidate cell If it is greater than the preset threshold, the terminal device switches from the serving cell to the first candidate cell.
  • the terminal device takes the factor of cell bandwidth into consideration during the cell reselection process, so that when the terminal device selects a cell to camp on, it can preferentially select a cell with a bandwidth greater than a preset threshold as the camp cell. It can be guaranteed that the data transmission rate will not be reduced due to bandwidth, thereby improving the user experience.
  • the terminal device determines to continue to camp on the current serving cell.
  • the terminal device during the cell reselection process, if the bandwidth of the candidate cell is less than or equal to the preset threshold, the terminal device does not switch to the candidate cell, thereby ensuring that the data transmission rate will not decrease due to bandwidth. Improve the user experience.
  • the terminal device marks the first candidate cell as prohibited Of the cell.
  • the terminal device determining that the first candidate cell satisfies a cell reselection condition according to the priority information and parameter information of the first candidate cell includes: According to the priority information of the first candidate cell, the terminal device determines that the priority of the first candidate cell is greater than the priority of the serving cell; the terminal device determines that the cell measurement value of the first candidate cell and the all The parameter information of the first candidate cell determines the cell selection reception level value Srxlev of the first candidate cell; the terminal device determines that the Srxlev of the first candidate cell is greater than a first threshold within a preset time period; and The terminal device determines to camp on the serving cell for more than one second.
  • the terminal device determining that the first candidate cell satisfies a cell reselection condition according to the priority information and parameter information of the first candidate cell includes: According to the priority information of the first candidate cell, the terminal device determines that the priority of the first candidate cell is equal to the priority of the serving cell; the terminal device determines the priority of the first candidate cell according to the parameter information of the first candidate cell.
  • the terminal device determining that the first candidate cell satisfies a cell reselection condition according to the priority information and parameter information of the first candidate cell includes: The terminal device determines, according to the priority information of the first candidate cell, that the priority of the first candidate cell is less than the priority of the serving cell; the terminal device determines that the cell measurement value of the first candidate cell and the all The parameter information of the first candidate cell determines the cell selection reception level value Srxlev of the first candidate cell; the terminal device determines that within a preset time period, the Srxlev of the first candidate cell is greater than a second threshold, and The Srxlev of the serving cell is less than a third threshold; and it is determined that the terminal device resides in the serving cell for more than one second.
  • a terminal device in a third aspect, has a function of implementing the method performed by the terminal device in the first aspect or the second aspect.
  • These functions 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.
  • a chip in a fourth aspect, includes a processor for invoking a computer program from a memory, and when the computer program is executed, a terminal device installed with the chip executes the first aspect or The method in the second aspect.
  • a communication device may be the terminal device in the above method embodiment, or a chip set in the terminal device.
  • the communication device includes a memory and a processor.
  • the memory is used to store computer executable program codes, and the processor is coupled with the memory.
  • the program code stored in the memory includes instructions, and when the processor executes the instructions, the communication device is caused to execute the method executed by the terminal device in the first aspect or the second aspect.
  • a computer program product comprising: computer program code, when the computer program code runs on a computer, the computer executes the method in the first aspect or the second aspect.
  • a computer-readable medium stores program code, and when the computer program code runs on a computer, the computer executes the method in the first or second aspect above .
  • Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • Fig. 2 is a schematic flowchart of a cell selection method according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a cell selection method according to another embodiment of the present application.
  • Fig. 4 is a schematic flowchart of a cell reselection method according to an embodiment of the present application.
  • Fig. 5 is a schematic flowchart of a cell selection method according to another embodiment of the present application.
  • Fig. 6 is a schematic flowchart of a cell selection method and a cell reselection method according to another embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • the terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application does not limit this.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • PLMN public land mobile network
  • the network device in the embodiment of the present application may be a device used to communicate with terminal devices.
  • the network device may be an evolved base station (evolutional nodeB, eNB or eNodeB) in an LTE system, or a cloud radio access network (cloud wireless access network).
  • Radio access network, CRAN) wireless controller, or the network equipment can be relay station, access point, in-vehicle equipment, wearable equipment, network equipment in the future 5G network or network equipment in the future evolved PLMN network, etc.
  • CRAN radio access network
  • the embodiments of this application are not limited.
  • Fig. 1 is a schematic diagram of a communication scenario in an embodiment of the present application.
  • the application scenario includes a terminal device 10 and a network device 20, and the network device 20 may be an access network device, such as a base station.
  • Each network device 20 includes one or more cells.
  • cell selection refers to a process in which a terminal device selects a cell that meets preset conditions and camps on when the terminal device accesses the network for the first time. For example, cell selection can occur when the terminal device is turned on or re-enters the network after being offline. Or cell selection can also occur when the terminal device enters the idle state from the connected state.
  • Cell reselection refers to the process in which the terminal device reselects and camps on the cell when there is a cell with better signal quality than the current serving cell after the terminal device accesses the network. For example, cell reselection can occur when the terminal device is in an idle state.
  • the NAS of the terminal device first selects a PLMN, and selects a radio access technology (RAT) from the selected PLMN, and then The AS of the terminal device executes the cell search process and judges whether the searched cell meets the conditions for camping.
  • judging whether a cell meets the camping condition in the prior art includes the following:
  • the PLMN of the cell is the PLMN selected by NAS, the PLMN of the cell is a registered PLMN, or the PLMN of the cell is a PLMN in the equivalent PLMN list;
  • the cell is not a forbidden cell
  • the tracking area identifier (TAI) of the cell is not the TAI in the list of forbidden tracking areas for roaming (forbidden tracking areas for roaming);
  • the cell satisfies the cell selection criteria (cell selection criteria), and the cell selection criteria are: Srxlev>0 and Squal>0, where Srxlev represents the cell selection RX level value (cell selection RX level value) (dB)), Squal represents the cell selection quality value (dB).
  • Srxlev and Squal can be expressed by the following formulas:
  • Q rxlevmeas may be reference signal receiving power (RSRP), and Q qualmeas may be reference signal receiving quality (RSRQ).
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • the measured cell reception level value Q rxlevmeas and the measured cell selection quality value Q qualmeas may also be collectively referred to as cell measurement values.
  • other parameters in formula (1) and formula (2) can be obtained from system messages.
  • the terminal device After the terminal device successfully camps in a certain cell, it searches for a cell with better signal quality according to cell reselection criteria.
  • the cell reselection criteria can be divided into the following three scenarios (a)-(c).
  • the Srxlev of the target cell is greater than the first threshold within the preset time period
  • the terminal equipment camps on the serving cell for more than one second.
  • Srxlev represents a cell selection reception (RX) level value
  • the first threshold represents a threshold condition that Srxlev needs to meet when the terminal device reselects a RAT/frequency with a higher priority than the current service frequency.
  • the first threshold may be expressed as Thresh X, High , and its unit may be decibels (dB).
  • the size of the preset time period may be defined according to a standard, and the preset time period may be expressed as Treselection RAT .
  • the size of the foregoing preset time period may be different in different situations.
  • the size of the preset time period may be different when the candidate cell and the serving cell are in the same frequency and different frequencies.
  • the target cell satisfies that Rs is greater than Rs within a preset time period.
  • the cell reselection conditions in this scenario can be referred to as cell-ranking criteria, or simply as R criteria.
  • R criteria cell-ranking criteria
  • Rs and Rn respectively represent the cell ranking criteria of the serving cell and the candidate cell.
  • Rs and Rn can be expressed by the following formula:
  • Rn Q meas,n -Qoffset-Qoffset temp ;
  • Qmeas,s and Qmeas,n respectively represent the reference signal receiving power (RSRP) measurement quality used in cell selection by the serving cell and the candidate cell
  • Q hyst represents the hysteresis value of the cell ranking criteria
  • Qoffset represents the cell Qoffset temp represents the offset temporarily applied to the cell.
  • the parameters involved in formula (3) and formula (4) can be obtained through system messages.
  • the target cell satisfies that the Srxlev is greater than the second threshold within a preset time period, and the Srxlev of the serving cell is less than the third threshold;
  • the terminal equipment camps on the serving cell for more than one second.
  • the Srxlev represents the cell selection RX level value
  • the second and third thresholds represent the threshold conditions that the Srxlev of the target cell and the serving cell need to meet when the terminal device reselects a lower priority RAT/frequency than the current serving frequency.
  • the second threshold may be called Thresh Serving, LowP
  • the third threshold may be called Thresh X, LowP
  • its unit may be dB.
  • the size of the preset time period may be defined according to a standard, and the preset time period may be expressed as Treselection RAT .
  • the size of the foregoing preset time period may be different in different situations.
  • the size of the preset time period may be different when the candidate cell and the serving cell are in the same frequency and different frequencies.
  • the above cell reselection conditions are not limited to the above examples, and several conditions may be added or reduced on the basis of the above examples of cell reselection conditions.
  • Squal can also be used instead of Srxlev as a condition for determining cell reselection.
  • the parameters used in the above calculation criteria for cell selection and cell reselection come from cell parameters and cell measurement values, and mainly rely on the priority information and measurement values of the cell, without considering the limitation of the cell bandwidth. Therefore, it may happen that the terminal device selects and resides in a narrowband cell. In this case, even if the signal quality of the cell is good, the data transmission rate of the terminal device is low due to bandwidth limitations, which affects the user experience. For example, the data transmission rate may be only a few thousand bits per second (Kbps) or tens of Kbps.
  • Kbps bits per second
  • this application proposes a solution for cell selection and cell reselection.
  • This solution considers the bandwidth information of the cell in the process of cell selection and cell reselection, so that the terminal device can reside in a cell with a higher data transmission rate, and the user experience is improved.
  • Fig. 2 is a schematic flowchart of a cell selection method according to an embodiment of the present application. As shown in FIG. 2, the specific content of the method 200 includes the following steps.
  • the terminal device searches for the first candidate cell.
  • the terminal device searches for the first candidate cell through a cell selection process.
  • the candidate cell in the embodiment of the present application may also be referred to as a suitable cell (suitable cell).
  • the cell selection procedure may include two ways.
  • One method is called a stored information cell selection process, which refers to a search performed by a terminal device based on a priori information when the prior information is stored.
  • the a priori information is used to indicate the cell information of the historical camping cell, such as frequency point information, carrier frequency, and cell parameters.
  • the terminal device may perform cell synchronization according to the cell frequency information in the prior information, and obtain the system information of the cell after the cell synchronization.
  • the terminal device can only search in the cells where cell information is stored. Then it is judged whether the searched cell meets the preset condition, if the preset condition is met, it is judged whether to camp in the cell, if not, the cell selection process is continued.
  • There is another method called the initial cell selection process which refers to a full frequency search performed when the terminal device does not store prior information.
  • the terminal device can perform a full-band search according to its own capabilities and configuration.
  • the NAS of the terminal device may perform a PLMN selection process and select a PLMN.
  • PLMN selection can also be called network selection.
  • the terminal device can maintain a PLMN list, and select a PLMN from the PLMN list according to priority.
  • the NAS of the terminal device can indicate the radio access technology (RAT) related to the selected PLMN to the AS, and instruct the AS of the terminal device to perform a cell selection process.
  • RAT radio access technology
  • the terminal device receives the system message of the first candidate cell, where the system message of the first candidate cell includes information indicating the following: the PLMN of the first candidate cell is a PLMN selected by NAS, or The PLMN of the first candidate cell is a registered PLMN, or the PLMN of the first candidate cell is a PLMN in an equivalent PLMN list; the first candidate cell is a cell that is not prohibited; the first candidate cell
  • the TAI is not in the tracking area identifier (TAI) in the roaming prohibited tracking area list; the parameter information of the first candidate cell; the bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the first The bandwidth of the candidate cell.
  • TAI tracking area identifier
  • the foregoing bandwidth information may be dl-Bandwidth (bandwidth) information in a master information block (master information block, MIB) message in a system message.
  • dl-Bandwidth information can be expressed as follows:
  • SQUENCE means sequence
  • ENUMERATED means enumeration.
  • n6, n15, n25, n50, n75, etc. are used to indicate different bandwidths.
  • the plmn-IdentityList (PLMN-identity list) information in the system information block type 1 (system information block type 1, SIB1) message can be used to indicate the PLMN of the cell
  • the trackingAreaCode in the SIB1 message Track area code
  • the cellBarred (barred cell) information in the SIB1 message is used to indicate whether the cell is a barred cell.
  • SIB1 information can be expressed as follows:
  • the parameter information of the first candidate cell may include parameters for calculating the cell selection reception level value Srxlev and the cell selection quality value Squal.
  • the above parameter information can also be carried in the SIB1 information.
  • the SIB1 information may include the parameter Q rxlevmin (q-RxLevMin) and the parameter Q rxlevminoffset (q-RxLevMinOffset).
  • the terminal device determines the cell selection reception level value Srxlev and the cell selection quality value Squal of the first candidate cell according to the cell measurement value and the parameter information of the first candidate cell, and determines that Srxlev>0, Squal> 0.
  • the terminal device may determine whether the first candidate cell meets the cell selection condition based on the system message included in the first candidate cell.
  • this condition may be referred to as the first preset condition.
  • the first preset condition may include the following:
  • the PLMN of the first candidate cell is a PLMN selected by NAS, the PLMN of the first candidate cell is a registered PLMN, or the PLMN of the first candidate cell is a PLMN in an equivalent PLMN list;
  • the first candidate cell is not a barred cell
  • the TAI of the first candidate cell is not the TAI in the list of forbidden tracking areas for roaming (forbidden tracking areas for roaming);
  • the first candidate cell satisfies cell selection criteria (cell selection criteria), and the cell selection criteria are: Srxlev>0 and Squal>0, where Srxlev represents a cell selection reception (RX) level value, Squal represents the cell selection quality value.
  • the terminal device can determine the cell selection reception level value Srxlev and the cell selection quality value Squal according to the cell measurement value and the parameter information of the first candidate cell, and determine that the cell selection reception level value Srxlev and the cell selection quality value Squal meet the conditions (4) Requirements.
  • the above-mentioned cell measurement value may include the measured cell reception level value Q rxlevmeas and the measured cell selection quality value Q qualmeas .
  • the specific method for determining the cell selection reception level value Srxlev and the cell selection quality value Squal refer to the description of formula (1) and formula (2) in the foregoing, and will not be repeated here.
  • the terminal device In a case where the bandwidth of the first candidate cell is greater than a preset threshold, the terminal device camps on the first candidate cell.
  • the terminal device on the basis that the first candidate cell satisfies the first preset condition, the terminal device also needs to determine whether the bandwidth of the first candidate cell is greater than a preset threshold. Only when the bandwidth of the first candidate cell is greater than the preset threshold , The terminal device determines to camp on the first candidate cell. The terminal device may determine the bandwidth of the first candidate cell according to the bandwidth information obtained in S202.
  • the terminal device selects a cell with a bandwidth greater than a preset threshold as a camping cell, thereby ensuring that the data transmission rate will not be reduced due to bandwidth, thereby improving user experience.
  • the size of the preset threshold is not limited, and the size of the preset threshold can be set according to communication practice.
  • a preset threshold may be set so that when the bandwidth of the cell is greater than the preset threshold, the data transmission rate is greater than a certain preset value.
  • the terminal device may also adopt other methods to determine whether the bandwidth of the first candidate cell meets the camping condition.
  • the bandwidth size of the cell can be corresponded to the bandwidth level.
  • bandwidth levels can be divided into level 1, level 2, level 3, level 4, and so on.
  • the terminal device may determine whether to camp in the first candidate cell according to the bandwidth level corresponding to the bandwidth of the first candidate cell. For example, suppose that in a case where the bandwidth level of the first candidate cell is greater than or equal to level 3, the terminal device determines to camp on the first candidate cell.
  • the terminal device determines not to camp on the first candidate cell. Further, the terminal device may continue to search for other candidate cells that meet the first preset condition, and if the bandwidth of the searched second candidate cell is greater than the preset threshold, the terminal device camps on the second candidate cell.
  • the terminal device if the bandwidth of the candidate cell is less than or equal to the preset threshold, the terminal device continues to search for other cells until it finds a cell with a bandwidth that meets the conditions, thereby ensuring that the data transmission rate will not be reduced due to the bandwidth, and the increase Improve the user experience.
  • the terminal device when the bandwidth of all candidate cells that meet the first preset condition searched by the terminal device is less than or equal to a preset threshold, the terminal device is in the candidate cells that meet the first preset condition Determine a cell to camp on, and the candidate cell that meets the first preset condition includes the first candidate cell.
  • the terminal device may temporarily not camp on the first candidate cell and continue to search for other candidate cells.
  • the bandwidth of the candidate cells is less than or equal to the preset threshold, and the terminal device arbitrarily selects a cell to camp on among the candidate cells that have been searched. And you can start periodic search to search for cells with a bandwidth greater than a preset threshold. If a cell that meets the conditions is searched, the cell can be switched in the cell reselection process.
  • other equivalent or variable methods may be used to determine whether the cell bandwidth meets the conditions for camping in the cell, which is not limited in the embodiment of the present application.
  • the terminal device selects the cell to reside in among the cells that have been searched and meets the first preset condition, so as to ensure that the terminal device can smoothly Stay in the cell to improve user experience.
  • the terminal device marks the first candidate cell as the cell with the lowest priority in the current RAT, or as the The cell with the lowest priority in all RATs supported by the terminal device.
  • the current RAT refers to the RAT corresponding to the cell currently camped on.
  • a PLMN can support multiple RATs.
  • China Mobile can support GSM, time division-synchronous code division multiple access (TD-SCDMA) and LTE.
  • the terminal device can obtain the priority information of the first candidate cell through a system message.
  • the priority of the cell from low to high can be represented by numbers 0-7. If the bandwidth of the first candidate cell is less than or equal to the preset threshold. Then, the terminal device may locally modify the priority information of the first candidate cell to modify it to the cell with the lowest priority in the current RAT, or mark it as the cell with the lowest priority in all RATs supported by the terminal device.
  • the lowest priority in the LTE standard is 5. If it is modified in the current RAT, the priority of the first candidate cell can be modified to 5. If the priority is modified in all RATs, the priority of the first candidate cell can be modified to 0. After modifying the priority, the terminal device can refer to the locally modified priority information to perform the subsequent cell reselection process.
  • the terminal device locally marks the cell with a bandwidth less than or equal to the preset threshold as the cell with the lowest priority, so that in the subsequent cell reselection process, it can preferentially camp on the cell with a bandwidth greater than the preset threshold.
  • the community improves the user experience.
  • the terminal device searches for the first candidate cell according to the a priori message, and the a priori message is used to indicate cell information of a historical camping cell.
  • the terminal device searches for the first candidate cell in the full frequency band, and the a priori message is used to indicate cell information of a historical camping cell.
  • the terminal device searches for the first candidate cell in the full frequency band, and the a priori message is used to indicate cell information of a historical camping cell.
  • the cell selection method assume that the first cell A and the second cell B both meet the first preset condition within the coverage of the first cell A and the second cell B of the terminal device.
  • the bandwidth of the first cell A is less than the preset threshold, and the second cell B is greater than the preset threshold.
  • the terminal device if the terminal device first searches for the first cell A, the terminal device will choose to reside in the first cell A without considering the bandwidth factor. Due to the bandwidth limitation, the data of the terminal device The transmission rate will be much lower than the user's expectations, resulting in a poor user experience.
  • the terminal device if the terminal device first searches for the first cell A in the cell selection process, the terminal device does not reside in the first cell A because the bandwidth of the first cell A is less than the preset threshold. Continue to search for other candidate cells that meet the first preset condition until the second cell B is found. Since the bandwidth of the second cell B is greater than the preset threshold, the terminal device finally resides in the second cell B, thereby ensuring the data transmission rate of the terminal device and improving user experience.
  • Fig. 3 is a schematic diagram of a cell selection method according to another embodiment of the present application. As shown in FIG. 3, the cell selection method 300 includes the following contents.
  • S301 The NAS of the terminal device selects a PLMN, and instructs the AS of the terminal device to perform a cell selection process.
  • the terminal device determines whether the bandwidth of the candidate cell is greater than a preset threshold. If the bandwidth of the candidate cell is greater than the preset threshold, then camp on the candidate cell. If the bandwidth of the candidate cell is less than or equal to the preset threshold, the candidate cell can be marked as the cell with the lowest priority in the current RAT, or as the cell with the lowest priority in all RATs, and then the terminal device continues to perform storage information Cell selection process. If the bandwidth of all candidate cells searched by the terminal device is less than the preset threshold, the terminal device may select a cell from the searched candidate cells as a camping cell.
  • the terminal device may continue to perform S303.
  • the terminal device may search for candidate cells that meet the first preset condition in the entire frequency band. If the bandwidth of the candidate cell is greater than the preset threshold, then camp on the candidate cell. If the bandwidth of the candidate cell is less than or equal to the preset threshold, the candidate cell can be marked as the cell with the lowest priority in the current RAT, or as the cell with the lowest priority in all RATs, and the terminal device continues to perform the initial cell selection process . If the bandwidth of all candidate cells searched by the terminal device is less than the preset threshold, the terminal device can select a cell among the candidate cells that have been searched and meet the first preset condition as the camping cell, and the terminal device can turn on the periodicity Search. The periodic search is used to search for a cell whose cell bandwidth is greater than a preset threshold.
  • the terminal device if the terminal device does not search for a candidate cell through the initial cell selection process, the terminal device performs an arbitrary cell search (any cell search) process.
  • the arbitrary cell search process refers to a process in which a terminal device attempts to camp on a restricted basis when it cannot obtain normal services.
  • the serving cell that resides through any cell search process only provides emergency services.
  • the cell where it resides also needs to meet the following conditions: (1) It is not a forbidden cell; (2) It meets the basic criteria for cell camping. Or, the terminal device can report the search failure and trigger the network selection process again.
  • the method 400 includes the following content.
  • a terminal device receives a system message of a serving cell where it resides, where the system message includes neighboring cell information, and the neighboring cell information includes priority information and parameter information of the first candidate cell.
  • the parameter information of the first candidate cell may include parameters used to determine whether the cell meets the cell reselection condition.
  • the above-mentioned parameter information may include parameters required for calculating Srxlev or Squal.
  • the above-mentioned parameter information may include parameters required for calculating Rs and Rn.
  • the neighboring cell information may be located in system information block type 4 (SIB4) information, system information block type 5 (system information block type 5, SIB5) in the system message.
  • SIB4 system information block type 4
  • SIB5 system information block type 5, SIB5
  • SIB6 system information block type 6
  • the terminal device determines, according to the priority information and parameter information of the first candidate cell, that the first candidate cell satisfies a cell reselection condition.
  • the terminal device may compare the priorities of the first candidate cell and the currently camped cell according to the priority information of the first candidate cell, and determine which of the scenarios (a)-(c) applicable to the cell reselection criteria which one. Then, according to the cell measurement result and parameter information, it is further judged whether the first candidate cell satisfies the cell reselection condition.
  • the terminal device receives the system message of the first candidate cell, where the system message of the first candidate cell includes bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the first candidate cell The bandwidth of the cell.
  • the terminal device may obtain the frequency information of the first candidate cell according to the neighboring cell information, perform cell synchronization with the first candidate cell according to the frequency information of the first candidate cell, and then receive the system message of the first candidate cell.
  • the bandwidth information may be dl-Bandwidth (bandwidth) information in a master information block (MIB) message in a system message.
  • MIB master information block
  • the serving cell currently camped on may also be referred to as a source cell, and the first candidate cell may also be referred to as a suitable cell.
  • the first candidate cell may be referred to as a target cell.
  • the terminal device on the basis that the first candidate cell satisfies the cell reselection condition, the terminal device also needs to determine whether the bandwidth of the first candidate cell is greater than a preset threshold. Only when the bandwidth of the first candidate cell is greater than the preset threshold, The terminal device determines to switch to the first candidate cell. The terminal device may determine the bandwidth of the first candidate cell according to the bandwidth information obtained in S403.
  • the terminal device selects to switch to a cell with a bandwidth greater than a preset threshold, thereby ensuring that the data transmission rate will not be reduced due to bandwidth, thereby improving user experience.
  • the terminal device determines to continue camping on the current serving cell.
  • the terminal device may locally mark the first candidate cell as a barred cell. After the first candidate cell is marked as a barred cell, the terminal device is prohibited from camping on the first candidate cell within a preset time period.
  • the duration of the preset time period can be determined according to practice, which is not limited in the embodiment of the present application.
  • the first candidate cell when the bandwidth of the first candidate cell is less than or equal to the preset threshold, the first candidate cell can be added to the cell barred list for limited bandwidth to prohibit camping on the cell. Describe the first candidate cell, and then end the cell reselection process. Or, instead of processing the first candidate cell, it is determined that the cell reselection fails, so as to continue to camp in the current serving cell.
  • the terminal device currently resides in the second cell B, and the first cell A is a neighboring cell of the terminal device.
  • the priority of the first cell A is higher than that of the second cell B, and the first cell A complies with the cell reselection conditions in the prior art (see the scenario (a) of the cell reselection criterion in the foregoing).
  • the bandwidth of the first cell A is less than the preset threshold, and the bandwidth of the second cell B is greater than the preset threshold.
  • the terminal device will switch to the first cell A.
  • the data transmission rate of the terminal device will be much lower than the user's expectation, resulting in poor user experience.
  • the terminal device since the bandwidth of the first cell A is less than the preset threshold, the terminal device will not switch to the first cell A, but continue to camp on the second cell B.
  • the terminal device searches for the first cell A during the previous cell selection or cell reselection process, it will mark the first cell A as the cell with the lowest priority locally. Therefore, during the cell reselection process, it will not The first cell A will be given priority to ensure the data transmission rate of the terminal equipment and improve the user experience.
  • Fig. 5 is a schematic flowchart of a cell reselection method according to another embodiment of the present application. As shown in FIG. 5, the flow of the cell reselection method 500 is as follows.
  • the terminal device resides in the source cell.
  • the terminal device performs cell measurement on the candidate cell, and determines to start a cell reselection process according to the result of the cell measurement.
  • the cell reselection conditions are as described above, and will not be repeated here.
  • the terminal device may determine whether it has stored bandwidth information of the candidate cell. If the bandwidth information of the candidate cell is not stored, the terminal device may obtain the bandwidth information of the candidate cell by receiving the system message of the candidate cell, and the system message of the candidate cell includes the bandwidth information.
  • the terminal device continues to perform the cell measurement and cell reselection procedures.
  • S504 The terminal device determines whether to switch from the source cell to the candidate cell according to the bandwidth information of the candidate cell.
  • the terminal device switches from the source cell to the candidate cell.
  • the terminal device For example, if the bandwidth of the candidate cell is less than or equal to the preset threshold, the terminal device camps on the source cell.
  • the terminal device may add the candidate cell to the list of forbidden cells with limited bandwidth, and end the cell reselection process. In this case, the terminal device is prohibited from camping on the candidate cell for a period of time. Or the terminal device may not perform any special processing on the candidate cell, but instead determine that the cell reselection fails, and continue to camp in the source cell.
  • Fig. 6 is a schematic flowchart of a method for cell selection and cell reselection according to another embodiment of the present application.
  • Figure 6 shows the detailed flow of cell selection and cell reselection. As shown in Figure 6, the method includes:
  • the terminal device selects a PLMN.
  • the NAS of the terminal device selects a network from a pre-stored PLMN list and selects a PLMN. For example, the terminal device can select a PLMN from the PLMN list according to the priority ranking. After the PLMN is selected, the NAS of the terminal device can indicate the RAT related to the selected PLMN to the AS, and instruct the AS of the terminal device to perform the cell selection process.
  • the AS of the terminal device executes the cell selection process with the stored information or the initial cell selection process according to whether the cell information corresponding to the PLMN is stored, and the cell information includes a priori information.
  • the cell selection process is used to search for candidate cells that meet the above-mentioned first preset condition.
  • the terminal device may search for candidate cells that meet the first preset condition according to the frequency information of the historical camping cell in the prior information.
  • the terminal device executes S603.
  • the initial cell selection process is to search for candidate cells that meet the first preset condition in the entire frequency band.
  • the terminal device determines whether the bandwidth of the candidate cell is greater than a preset threshold. If the bandwidth of the candidate cell is greater than the preset threshold, camp on the candidate cell. If the bandwidth of the candidate cell is less than the preset threshold, return to S602 or S603 to continue the cell selection process.
  • the terminal device can obtain the bandwidth information of the candidate cell through the system message.
  • the bandwidth information of the candidate cell may be dl-Bandwidth (bandwidth) information in the MIB message in the system message.
  • any cell selection process in step S608 can be performed if the bandwidth of the candidate cell is greater than the preset threshold.
  • the terminal device searches for one or more candidate cells that meet the first preset condition in S603 and S604, but the bandwidth of all the candidate cells searched is less than or equal to the preset threshold, the terminal device is in the candidate cell Choose a cell to camp on. If the terminal device does not find a candidate cell that meets the first preset condition in S603 and S604, the terminal device executes any cell selection procedure in S608.
  • S606 When the terminal device returns from the connected state to the idle state or the inactive state, it may perform the cell selection process after leaving the connected state. Wherein, the terminal device first searches for the last camped cell, determines whether the first preset condition is met, and executes S604. If the last camped cell does not meet the first preset condition, the terminal device executes the cell selection process with stored information in S602.
  • the terminal device After camping on the cell, the terminal device leaves the idle state and/or the inactive state and is in the connected state.
  • the terminal device can perform the cell selection process after leaving the connected state.
  • the terminal device preferentially tries to camp in the last camped serving cell, and if it cannot camp, it searches for other cells and tries to camp.
  • the terminal device may trigger a cell reselection process when it detects a candidate cell that meets the cell reselection condition.
  • the terminal device may perform the step of S604 to determine whether to switch from the source cell where it resides to the candidate cell. If the bandwidth of the candidate cell is less than or equal to the preset threshold, the cell reselection process can be ended, and the candidate cell can camp on the source cell again. Or, if no candidate cell meeting the reselection condition is found, any cell selection process in S608 can be executed.
  • S608 The terminal device executes any cell selection process.
  • any cell selection process can be performed.
  • the arbitrary cell selection process can also be referred to as an arbitrary cell search process, which refers to a process in which a terminal device attempts to camp on a restricted basis when a normal service cannot be obtained.
  • an arbitrary cell search process refers to a process in which a terminal device attempts to camp on a restricted basis when a normal service cannot be obtained.
  • FIG. 7 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application.
  • the terminal device 700 may be used to execute the cell selection method or step performed by the terminal device in the method embodiment of the present application.
  • the terminal device 700 includes: a searching unit 710, a receiving unit 720, and a processing unit 730.
  • the searching unit 710 is used to search for the first candidate cell.
  • the receiving unit 720 is configured to receive a system message of the first candidate cell, and the system message of the first candidate cell includes information indicating the following: the PLMN of the first candidate cell is a non-access stratum NAS
  • the selected PLMN, or the PLMN of the first candidate cell is a registered PLMN, or the PLMN of the first candidate cell is a PLMN in an equivalent PLMN list;
  • the first candidate cell is a cell that is not barred;
  • the TAI of the first candidate cell is not the TAI in the roaming prohibited tracking area list; the parameter information of the first candidate cell; the bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the first The bandwidth of the candidate cell;
  • the processing unit 730 is configured to determine the cell selection reception level value Srxlev and the cell selection quality value Squal of the first candidate cell according to the cell measurement value and the parameter information of the first candidate cell, and determine Srxlev>0
  • FIG. 8 is a schematic structural diagram of a terminal device 800 according to an embodiment of the present application.
  • the terminal device 800 may be used to execute the cell reselection method or step performed by the terminal device in the method embodiment of the present application.
  • the terminal device 800 includes: a receiving unit 810 and a determining unit 820.
  • the receiving unit 810 is configured to receive a system message of a serving cell where it resides, where the system message includes neighboring cell information, and the neighboring cell information includes priority information and parameter information of the first candidate cell.
  • the determining unit 820 is configured to determine that the first candidate cell satisfies a cell reselection condition according to the priority information and parameter information of the first candidate cell.
  • the receiving unit 810 is further configured to receive a system message of the first candidate cell, where the system message of the first candidate cell includes bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the first candidate cell.
  • the bandwidth of a candidate cell is further configured to determine that the terminal device is handed over from the serving cell to the first candidate cell when the bandwidth of the first candidate cell is greater than a preset threshold.
  • FIG. 9 is a schematic structural diagram of a terminal device 900 according to another embodiment of the present application.
  • the terminal device 900 may be used to execute the methods or steps executed by the terminal device in the method embodiments of the present application.
  • the terminal device 900 includes:
  • the memory 920 is used to store programs
  • the processor 930 is configured to execute programs in the memory 920.
  • the processor 930 when the program is executed, the processor 930 is configured to search for the first candidate cell; receive the system information of the first candidate cell through the transceiver 910, and the system information of the first candidate cell Includes information indicating the following: the PLMN of the first candidate cell is the PLMN selected by NAS, or the PLMN of the first candidate cell is a registered PLMN, or the PLMN of the first candidate cell is equivalent The PLMN in the PLMN list; the first candidate cell is a cell that is not barred; the TAI of the first candidate cell is not the TAI in the roaming prohibited tracking area list; the parameter information of the first candidate cell; The bandwidth information of the first candidate cell, the bandwidth information is used to indicate the bandwidth of the first candidate cell; and the cell of the first candidate cell is determined according to the cell measurement value and the parameter information of the first candidate cell Select the reception level value Srxlev and the cell selection quality value Squal, and determine Srxlev>0, Squal>0; and when the bandwidth of the first candidate cell is
  • the processor 930 when the program is executed, is configured to receive, through the transceiver 910, a system message of a serving cell where it resides, and the system message includes neighbor cell information, and the neighbor cell information Including the priority information and parameter information of the first candidate cell; and according to the priority information and parameter information of the first candidate cell, it is determined that the first candidate cell satisfies the cell reselection condition; and through the transceiver 910 Receiving the system message of the first candidate cell, where the system message of the first candidate cell includes bandwidth information of the first candidate cell, and the bandwidth information is used to indicate the bandwidth of the first candidate cell; and In a case where the bandwidth of the first candidate cell is greater than a preset threshold, it is determined that the terminal device is handed over from the serving cell to the first candidate cell.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供了一种小区选择、小区重选的方法和芯片，能够提高用户体验。小区选择方法包括：终端设备搜索第一候选小区并接收第一候选小区的系统消息，系统消息中包括第一候选小区的参数信息和第一候选小区的带宽信息，带宽信息用于指示第一候选小区的带宽；终端设备根据小区测量值和第一候选小区的参数信息，确定第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；在第一候选小区的带宽大于预设阈值的情况下，终端设备驻留在第一候选小区。

Description

小区选择的方法、小区重选的方法和芯片
本申请要求在2019年4月26日提交中国国家知识产权局、申请号为201910342104.3的中国专利申请的优先权，发明名称为“一种小区驻留的方法”的中国专利申请的优先权，在2019年7月18日提交中国国家知识产权局、申请号为201910651489.1的中国专利申请的优先权，发明名称为“小区选择的方法、小区重选的方法和芯片”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及小区选择的方法、小区重选的方法和芯片。
背景技术
终端设备在开机之后，需要执行公共陆地移动网络(public land mobile network,PLMN)选择和小区选择流程，然后在选择的小区中驻留并进行注册，才能享受网络服务。具体地，终端设备的非接入层(non-access stratum,NAS)首先执行公共陆地移动网络(public land mobile network,PLMN)选择。在选定PLMN和无线接入技术(radio access technology,RAT)之后，终端设备的接入层(access stratum,AS)执行小区选择流程。在小区选择流程中，终端设备搜索符合预设条件的小区，并驻留在选择的小区中。其中，选择小区的条件主要包括小区参数信息以及小区测量结果等信息，但上述选择小区的方式考虑的信息并不全面，导致有些时候终端设备驻留的小区的通信质量不佳，用户体验较差。
发明内容
本申请提供一种小区选择方法、小区重选方法、终端设备和芯片，能够提高用户体验。
第一方面，提供了一种小区选择的方法，包括：终端设备搜索第一候选小区；终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的PLMN是NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；所述终端设备根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备驻留在所述第一候选小区。
在本申请实施例中，终端设备在小区选择的过程中，考虑了小区带宽的因素，从而在终端设备选择驻留小区时可优先选择带宽大于预设阈值的小区，从而能够保证不会由于带宽原因导致数据传输速率降低，从而提高了用户体验。
结合第一方面，在一种可能的实现方式中，还包括：在所述第一候选小区的带宽小于 或等于所述预设阈值的情况下，所述终端设备不驻留在所述第一候选小区。
在本申请实施例中，若候选小区的带宽小于或等于预设阈值，则终端设备不驻留在该候选小区，以便于继续搜索带宽大于预设阈值的小区，从而能够保证不会由于带宽原因导致数据传输速率降低，提高了用户体验。
结合第一方面，在一种可能的实现方式中，还包括：在所述终端设备搜索到的所有符合第一预设条件的候选小区的带宽均小于或等于所述预设阈值的情况下，所述终端设备在符合第一预设条件的候选小区中确定驻留的小区；所述第一预设条件包括：所述候选小区的PLMN是NAS选择的PLMN，或所述候选小区的PLMN是注册的PLMN，或所述候选小区的PLMN是等价的PLMN列表中的PLMN；所述候选小区是未被禁止的小区；所述候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；Srxlev>0，且Squal>0。
在本申请实施例中，若搜索到的符合第一预设条件的候选小区的带宽均小于或等于预设阈值，则终端设备在已搜索到的小区中选择驻留的小区，保证终端设备能顺利驻留在小区中，以提高用户体验。
结合第一方面，在一种可能的实现方式中，还包括：在所述第一候选小区的带宽小于或等于预设阈值的情况下，所述终端设备将所述第一候选小区标记为当前无线接入技术RAT内优先级最低的小区，或标记为所述终端设备支持的所有RAT内优先级最低的小区。
在本申请实施例中，通过将带宽小于或等于预设阈值的小区标记为优先级最低的小区，从而在后续的小区重选过程中，可以根据参考本地修改的优先级信息，优先驻留在带宽大于预设阈值的小区，提高了用户体验。
结合第一方面，在一种可能的实现方式中，所述终端设备搜索第一候选小区，包括：在本地存储有先验消息的情况下，所述终端设备根据所述先验消息搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
结合第一方面，在一种可能的实现方式中，所述终端设备搜索第一候选小区，还包括：在根据所述先验消息未搜索到第一候选小区的情况下，所述终端设备通过全频段搜索确定所述第一候选小区。
结合第一方面，在一种可能的实现方式中，所述终端设备搜索第一候选小区，包括：在本地未存储有先验消息的情况下，所述终端设备在全频段搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
第二方面，提供了一种小区重选的方法，包括：终端设备接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息；所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件；所述终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备从所述服务小区切换至所述第一候选小区。
在本申请实施例中，终端设备在小区重选的过程中，考虑了小区带宽的因素，从而在终端设备选择驻留小区时可优先选择选择带宽大于预设阈值的小区作为驻留小区，从而能够保证不会由于带宽原因导致数据传输速率降低，从而提高了用户体验。
结合第二方面，在一种可能的实现方式中，在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备确定继续驻留在当前服务小区。
在本申请实施例中，在小区重选过程中，若候选小区的带宽小于或等于预设阈值，则终端设备不切换至该候选小区，从而能够保证不会由于带宽原因导致数据传输速率降低，提高了用户体验。
结合第二方面，在一种可能的实现方式中，在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备将所述第一候选小区标记为被禁止的小区。
在本申请实施例中，通过将带宽小于或等于预设阈值的小区标记为被禁止的小区，从而在小区重选过程中避免驻留在带宽不符合条件的小区，提高了用户体验。
结合第二方面，在一种可能的实现方式中，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级大于所述服务小区的优先级；所述终端设备根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；所述终端设备确定在预设时间段内所述第一候选小区的Srxlev大于第一阈值；以及所述终端设备确定在所述服务小区驻留超过一秒。
结合第二方面，在一种可能的实现方式中，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级等于所述服务小区的优先级；所述终端设备根据所述第一候选小区的参数信息，确定所述第一候选小区的小区排序准则Rn；所述终端设备确定Rn大于Rs，Rs表示所述服务小区的小区排序准则。
结合第二方面，在一种可能的实现方式中，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级小于所述服务小区的优先级；所述终端设备根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；所述终端设备确定在预设时间段内，所述第一候选小区的Srxlev大于第二阈值，且所述服务小区的Srxlev小于第三阈值；以及确定所述终端设备在所述服务小区驻留超过一秒。
第三方面，提供了一种终端设备，该终端设备具有实现上述第一方面或第二方面中的终端设备执行的方法的功能。这些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。所述硬件或软件包括一个或多个与上述功能相对应的单元。
第四方面，提供了一种芯片，该芯片包括处理器，该处理器用于从存储器调用计算机程序，当所述计算机程序被执行时，使得安装有所述芯片的终端设备执行上述第一方面或第二方面中的方法。
第五方面，提供了一种通信装置，该通信装置可以为上述方法实施例中的终端设备，或者为设置在终端设备中的芯片。该通信装置包括：存储器以及处理器。存储器用于存储计算机可执行程序代码，处理器与存储器耦合。其中存储器所存储的程序代码包括指令，当处理器执行所述指令时，使通信装置执行上述第一方面或第二方面中由终端设备所执行的方法。
第六方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面或第二方面中的方法。
第七方面，提供了一种计算机可读介质，所述计算机可读介质存储有程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述第一方面或第二方面中的方法。
附图说明
图1是本申请实施例的应用场景的示意图。
图2是本申请实施例的小区选择方法的流程示意图。
图3是本申请又一实施例的小区选择方法的流程示意图。
图4是本申请实施例的小区重选方法的流程示意图。
图5是本申请又一实施例的小区选择方法的流程示意图。
图6是本申请又一实施例的小区选择方法和小区重选方法的流程示意图。
图7是本申请实施例的终端设备的结构示意图。
图8是本申请又一实施例的终端设备的结构示意图。
图9是本申请又一实施例的终端设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，该网络设备可以是LTE系统中的演进型基站(evolutional nodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，本申请实施例并不限定。
图1是本申请实施例的通信场景的示意图。如图1所示，该应用场景包括终端设备10和网络设备20，所述网络设备20可以为接入网设备，例如基站。每个网络设备20包 括一个或多个小区。当终端设备10移动到小区的覆盖范围内时，可以执行小区选择或小区重选。其中，小区选择是指终端设备在第一次接入网络时选择符合预设条件的小区并进行驻留的过程，例如，小区选择可以发生在终端设备开机时或脱网之后重新入网的时候。或者小区选择也可以发生在终端设备从连接态进入空闲态的时候。小区重选是指终端设备在接入网络之后，当存在比当前服务小区信号质量更好的小区的情况下，终端设备重新选择小区并驻留的过程。例如，小区重选可以发生在终端设备为空闲态的时候。
在现有的小区选择过程中，终端设备在开机或其他场景下，首先由终端设备的NAS进行PLMN选择，并在选择的PLMN中选择一个无线接入技术(radio access technology,RAT)，然后由终端设备的AS执行小区搜索流程，并判断搜索到的小区是否符合驻留的条件。作为示例，现有技术中判断小区是否符合驻留条件包括以下内容：
(1)小区的PLMN是NAS选择的PLMN，小区的PLMN是注册的PLMN，或小区的PLMN是等价PLMN列表中的PLMN；
(2)小区不是被禁止的小区；
(3)小区的跟踪区域标识(tracking area identifier,TAI)不是漫游禁止的跟踪区域列表(forbidden tracking areas for roaming)中的TAI；
(4)小区满足小区选择准则(cell selection criteria)，所述小区选择准则为：Srxlev>0，且Squal>0，其中，Srxlev表示小区选择接收(reception,RX)等级值(cell selection RX level value(dB))，Squal表示小区选择质量值(cell selection quality value(dB))。其中，作为一个示例，Sxlev和Squal分别可以用以下公式来表示：
Srxlev＝Q rxlevmeas–(Q rxlevmin+Q rxlevminoffset)–Pcompensation-Qoffset temp    (1)
Squal＝Q qualmeas–(Q qualmin+Q qualminoffset)-Qoffset temp     (2)
其中，以LTE系统为例，上述公式中涉及到的参数可以如表1所示。
表1
Figure PCTCN2020085554-appb-000001
Figure PCTCN2020085554-appb-000002
在一些示例中，Q rxlevmeas可以是参考信号接收功率(reference signal receiving power,RSRP)，Q qualmeas可以是参考信号接收质量(reference signal receiving quality,RSRQ)。
可选地，测量的小区接收等级值Q rxlevmeas以及测量的小区选择质量值Q qualmeas也可以统称为小区测量值。可选地，公式(1)和公式(2)中的其它参数可以从系统消息中获取。
在小区选择的过程中，终端设备成功驻留在某个小区之后，会按照小区重选准则(cell reselection criteria)搜索信号质量更好的小区。作为一个示例，根据网络侧配置的优先级信息，小区重选准则可分为以下三种场景(a)-(c)。
场景(a)：若目标小区的优先级比服务小区的优先级高，则触发小区重选的条件如下：
(1)在预设时间段内目标小区的Srxlev大于第一阈值；
(2)所述终端设备在所述服务小区驻留超过一秒。
其中Srxlev表示小区选择接收(reception,RX)等级值，第一阈值表示在终端设备在重新选择比当前服务频率更高优先级的RAT/频率时，Srxlev需要满足的阈值条件。例如，第一阈值可以表示为Thresh X,High，其单位可以为分贝(dB)。可选地，在本申请实施例中，预设时间段的大小可根据标准定义，预设时间段可以表示为Treselection RAT。上述预设时间段的大小在不同情形下可以不同，例如，候选小区和服务小区在同频和异频的情形下，预设时间段的大小可以不同。
场景(b)：若目标小区的优先级与服务小区的优先级相同，则触发小区重选的条件如下：
目标小区在预设时间段内满足Rs大于Rs。
该场景下的小区重选条件可以称为小区排序准则(cell-ranking criteria)，也可以简称 为R准则。其中，Rs和Rn分别表示服务小区和候选小区的小区排序准则。在一个示例中，Rs和Rn可以由以下公式表示：
Rs＝Q meas,s+Q hyst–Qoffset temp；       (3)
Rn＝Q meas,n-Qoffset–Qoffset temp；      (4)
其中，Qmeas,s和Qmeas,n分别表示服务小区和候选小区在小区选择中使用的参考信号接收功率(reference signal receiving power,RSRP)测量质量，Q hyst表示小区排序准则的迟滞值，Qoffset表示小区的偏移量，Qoffset temp表示临时应用于小区的偏移量。可选地，公式(3)和公式(4)中涉及的参数可以通过系统消息中获取。
场景(c)：若目标小区的优先级比服务小区的优先级低，则触发小区重选的条件如下：
(1)目标小区在预设时间段内满足Srxlev大于第二阈值，且所述服务小区的Srxlev小于第三阈值；
(2)所述终端设备在所述服务小区驻留超过一秒。
其中Srxlev表示小区选择RX等级值，第二阈值和第三阈值表示当终端设备重新选择比当前服务频率更低优先级RAT/频率时，目标小区和服务小区的Srxlev需要满足的阈值条件。例如，第二阈值可以称为Thresh Serving,LowP，第三阈值可以称为Thresh X,LowP，其单位可以为dB。可选地，在本申请实施例中，预设时间段的大小可根据标准定义，预设时间段可以表示为Treselection RAT。上述预设时间段的大小在不同情形下可以不同，例如，候选小区和服务小区在同频和异频的情形下，预设时间段的大小可以不同。
可选地，上述小区重选条件不限于上述示例，也可以在上述示例的小区重选条件的基础上增加或减少若干条件。可选地，在场景(a)和场景(c)中，也可以采用Squal替代Srxlev，作为判断小区重选的条件。
上述计算小区选择和小区重选的准则所使用的参数来自于小区参数和小区测量值，并主要依赖与小区的优先级信息以及测量值，并未考虑小区的带宽(bandwidth)的限制。因此可能会出现终端设备选择并驻留在窄带(narrow band)小区的情况。在这种情况下，即使小区的信号质量较好，但由于带宽的限制，终端设备的数据传输速率较低，从而影响了用户体验。例如数据传输速率可能只有几千比特每秒(Kbps)或几十Kbps。
为了解决上述问题，本申请提出了一种小区选择和小区重选的方案。该方案在小区选择和小区重选的过程中考虑了小区的带宽信息，从而使得终端设备驻留在数据传输速率较高的小区，提高了用户体验。
图2是本申请实施例的小区选择方法的流程示意图。如图2所示，方法200的具体内容包括如下步骤。
S201、终端设备搜索第一候选小区。
可选地，终端设备通过小区选择流程搜索第一候选小区。可选地，本申请实施例中的候选小区也可以称为可用小区(suitable cell)。
可选地，小区选择流程可以包括两种方式。一种方式称为有存储信息的小区选择(stored information cell selection)流程，是指终端设备在存储有先验信息的情况下根据先验信息进行的搜索。先验信息用于指示历史驻留小区的小区信息，例如频点信息、载波频率、小区参数等。例如，终端设备可以根据先验信息中的小区频点信息，进行小区同步，在小区同步之后，获取小区的系统消息。终端设备可以只在存储有小区信息的小区中进行 搜索。然后判断是搜索到的小区是否满足预设条件，若满足预设条件，则判断是否在该小区驻留，若不满足，则继续进行小区选择流程。还有一种方式称为初始小区选择(initial cell selection)流程，是指在终端设备没有存储先验信息的情况下进行的全频段搜索。终端设备可以根据自身的能力和配置进行全频段搜索。
可选地，在一些具体示例中，在S201之前，终端设备的NAS可以执行PLMN选择流程，并选定一个PLMN。其中PLMN选择也可以称为选网。例如，终端设备可以维护一个PLMN列表，并根据优先级排序从PLMN列表中选定PLMN。在选定PLMN之后，终端设备的NAS可以向AS指示与选定的PLMN相关的无线接入技术(radio access technology,RAT)，并指示终端设备的AS执行小区选择流程。
S202、终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的PLMN是NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的TAI不是漫游禁止的跟踪区域列表中的(tracking area identifier,TAI)；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽。
可选地，以LTE系统为例，上述带宽信息可以是系统消息中的主信息块(master information block,MIB)消息中的dl-Bandwidth(带宽)信息。例如，在通信协议中，dl-Bandwidth信息可以表示如下：
Figure PCTCN2020085554-appb-000003
其中，SQUENCE表示序列，ENUMERATED表示列举。n6,n15,n25,n50,n75等用于指示不同的带宽。
可选地，以LTE系统为例，系统信息块类型1(system information block type 1，SIB1)消息中的plmn-IdentityList(PLMN-身份列表)信息可以用于指示小区的PLMN，SIB1消息中的trackingAreaCode(跟踪区域码)新可以用于指示小区的TAI是否属于漫游禁止的TAI列表，SIB1消息中的cellBarred(被禁止小区)信息用于指示小区是否为禁止小区。在通信协议中，SIB1信息可以表示如下：
Figure PCTCN2020085554-appb-000004
可选地，上述第一候选小区的参数信息，可以包括用于计算小区选择接收等级值Srxlev和小区选择质量值Squal的参数。上述参数信息也可以携带于SIB1信息中。例如，SIB1信息中可以包括参数Q rxlevmin(q-RxLevMin)和参数Q rxlevminoffset(q-RxLevMinOffset)。
本领域技术人员能够理解，上述关于各信息的描述仅仅作为例子，系统消息也可以在其他位置携带上述各信息，本申请实施例对此不做限定。
S203、所述终端设备根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0。
可选地，终端设备可以根据第一候选小区包括的系统消息，判断第一候选小区是否符合小区选择的条件，在本申请实施例中，该条件可以称为第一预设条件。第一预设条件可以包括以下内容：
(1)所述第一候选小区的PLMN是NAS选择的PLMN，所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价PLMN列表中的PLMN；
(2)所述第一候选小区不是被禁止的小区；
(3)所述第一候选小区的TAI不是漫游禁止的跟踪区域列表(forbidden tracking areas for roaming)中的TAI；
(4)所述第一候选小区满足小区选择准则(cell selection criteria)，所述小区选择准则为：Srxlev>0，且Squal>0，其中，Srxlev表示小区选择接收(reception,RX)等级值，Squal表示小区选择质量值。
其中，根据S202中的信息，第一候选小区已符合条件(1)-(3)。在S203中，终端设备可以根据小区测量值和第一候选小区的参数信息，确定小区选择接收等级值Srxlev和小区选择质量值Squal，并确定小区选择接收等级值Srxlev和小区选择质量值Squal符合条件(4)的要求。
其中，上述小区测量值可以包括测量的小区接收等级值Q rxlevmeas以及测量的小区选择质量值Q qualmeas。关于确定小区选择接收等级值Srxlev和小区选择质量值Squal的具体方式，可以参见前文中关于公式(1)和公式(2)的描述，此处不再赘述。
S204、在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备驻留在所述第一候选小区。
可选地，在第一候选小区满足第一预设条件的基础上，终端设备还需判断第一候选小区的带宽是否大于预设阈值，只有第一候选小区的带宽大于预设阈值的情况下，终端设备确定驻留在第一候选小区。终端设备可以根据S202中获取的带宽信息确定第一候选小区的带宽。
在本申请实施例中，终端设备在小区选择的过程中，选择带宽大于预设阈值的小区作为驻留小区，从而能够保证不会由于带宽原因导致数据传输速率降低，从而提高了用户体验。
在本申请实施例中，对预设阈值的大小不作限定，可以根据通信实践对预设阈值的大小进行设置。例如，可以设置预设阈值，使得在小区的带宽大于该预设阈值时，数据传输速率大于某个预设值。
可选地，除了将带宽与预设阈值比较之外，终端设备也可以采取其它方式判断第一候 选小区的带宽是否符合驻留的条件。例如，可以将小区的带宽大小与带宽等级对应。例如，根据带宽由小到大的顺序，可以将带宽等级划分为等级1、等级2、等级3、等级4等。终端设备可以根据第一候选小区的带宽对应的带宽等级，确定是否驻留在第一候选小区。例如，假设在第一候选小区的带宽等级大于或等于等级3的情况下，终端设备确定驻留在所述第一候选小区。
在一些示例中，在所述第一候选小区的带宽小于或等于预设阈值的情况下，所述终端设备确定不驻留在所述第一候选小区。进一步地，所述终端设备可以继续搜索其它符合第一预设条件的候选小区，若搜索到第二候选小区的带宽大于所述预设阈值，则终端设备驻留在第二候选小区中。
在本申请实施例中，若候选小区的带宽小于获得等于预设阈值，则终端设备继续搜索其它小区，直至找到带宽符合条件的小区，从而能够保证不会由于带宽原因导致数据传输速率降低，提高了用户体验。
在一些示例中，在所述终端设备搜索的符合第一预设条件的所有候选小区的带宽均小于或等于预设阈值的情况下，所述终端设备在符合第一预设条件的候选小区中确定驻留的小区，所述符合第一预设条件的候选小区包括所述第一候选小区。
例如，在所述第一候选小区的带宽小于或等于预设阈值的情况下，所述终端设备可以暂不驻留在所述第一候选小区，并继续搜索其它候选小区，若搜索到所有的候选小区的带宽均小于或等于所述预设阈值，则终端设备在已搜索到的候选小区中任意选择一个小区进行驻留。并且可以开启周期性搜索，以搜索带宽大于预设阈值的小区，若搜索到符合条件的小区，可以在小区重选流程中切换小区。或者，还可以采取其他等价或变化的方式判断小区带宽是否符合在小区驻留的条件，本申请实施例对此不作限定。
在本申请实施例中，若搜索到的候选小区的带宽均不符合预设条件，则终端设备在已搜索到的符合第一预设条件的小区中选择驻留的小区，保证终端设备能顺利驻留在小区中，以提高用户体验。
可选地，在所述第一候选小区的带宽小于或等于预设阈值的情况下，所述终端设备将所述第一候选小区标记为当前RAT内优先级最低的小区，或标记为所述终端设备支持的所有RAT内优先级最低的小区。其中，所述当前RAT是指当前驻留的小区所对应的RAT。其中，通常情况下，一个PLMN可支持多个RAT。例如，中国移动可支持GSM、时分-同步码分多址(time division-synchronous code division multiple access,TD-SCDMA)和LTE。
例如，终端设备通过系统消息可以获取到第一候选小区的优先级信息。可选地，小区的优先级由低到高可以由数字0-7表示。若第一候选小区的带宽小于或等于预设阈值。则终端设备可以在本地修改第一候选小区的优先级信息，将其修改为当前RAT内优先级最低的小区，或标记为所述终端设备支持的所有RAT内优先级最低的小区。例如，LTE制式内的最低优先级为5，若在当前RAT内修改，则可以将第一候选小区的优先级修改为5。若在所有RAT内对优先级进行修改，则可以将第一候选小区的优先级修改为0。在修改优先级之后，终端设备可以参考本地修改后的优先级信息，执行后续的小区重选过程。
在本申请实施例中，终端设备通过在本地将带宽小于或等于预设阈值的小区标记为优先级最低的小区，从而在后续的小区重选过程中可以优先驻留在带宽大于预设阈值的小区，提高了用户体验。
可选地，在本地存储有先验消息的情况下，所述终端设备根据所述先验消息搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。在一些示例中，在本地未存储有先验消息的情况下，所述终端设备在全频段搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
可选地，在本地未存储有先验消息的情况下，所述终端设备在全频段搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
作为小区选择方法的一个示例，假设终端设备第一小区A和第二小区B的覆盖范围内，第一小区A和第二小区B均符合第一预设条件。第一小区A的带宽小于预设阈值，第二小区B大于预设阈值。则按照现有技术中的小区选择流程，若终端设备先搜索到第一小区A，终端设备将选择驻留在第一小区A中，并不考虑带宽因素，由于带宽的限制，终端设备的数据传输速率将远低于用户的预期，从而导致用户体验较差。而在本申请实施例中，若终端设备在小区选择流程中先搜索到第一小区A，由于第一小区A的带宽小于预设阈值，终端设备并不驻留在第一小区A中，而是继续搜索符合第一预设条件的其它候选小区，直至搜索到第二小区B。由于第二小区B的带宽大于预设阈值，因此终端设备最终驻留在第二小区B中，从而保证终端设备的数据传输速率，提高用户体验。
图3是本申请又一实施例的小区选择方法的示意图。如图3所示，小区选择方法300包括以下内容。
S301、终端设备的NAS选定一个PLMN，并指示终端设备的AS执行小区选择流程。
可选地，关于小区选择流程的具体内容，可参见图2的相关描述，此处不再赘述。
S302、若终端设备存储有先验信息，则执行有存储信息的小区选择流程。
例如，若终端设备搜索到符合第一预设条件的候选小区，则终端设备确定该候选小区的带宽是否大于预设阈值。若候选小区的带宽大于预设阈值，则驻留在该候选小区上。若候选小区的带宽小于或等于预设阈值，则可以将该候选小区标记为当前RAT内优先级最低的小区，或者标记为所有RAT内优先级最低的小区，然后终端设备继续执行有存储信息的小区选择流程。若终端设备搜索的所有候选小区的带宽均小于预设阈值，则终端设备可以在搜索到的候选小区中选择一个小区作为驻留小区。
可选地，若终端设备通过执行有存储信息的小区选择流程未搜索到符合预设条件的候选小区，则可以继续执行S303。
S303、若终端设备未存储先验信息或者通过有存储信息的小区选择流程未搜索到候选小区，则终端设备执行初始小区选择流程。
在具体示例中，终端设备可以在全频段搜索符合第一预设条件的候选小区。若候选小区的带宽大于预设阈值，则驻留在该候选小区上。若候选小区的带宽小于或等于预设阈值，则可以将该候选小区标记为当前RAT内优先级最低的小区，或者标记为所有RAT内优先级最低的小区，然后终端设备继续执行初始小区选择流程。若终端设备搜索的所有候选小区的带宽均小于预设阈值，则终端设备可以在已搜索到的符合第一预设条件的候选小区中选择一个小区作为驻留小区，并且终端设备可以开启周期性搜索，该周期性搜索用于搜索小区带宽大于预设阈值的小区。
在具体示例中，若终端设备通过初始小区选择流程未搜索到候选小区，则终端设备执行任意小区搜索(any cell search)流程。其中任意小区搜索流程是指终端设备在不能获取正常服务的情况下尝试受限驻留的过程。通过任意小区搜索流程驻留的服务小区仅提供紧 急服务。其中驻留的小区还需满足以下条件：(1)不是被禁止的小区；(2)满足基本的小区驻留准则。或者，终端设备可以上报搜索失败，重新触发选网流程。
下文结合图4，介绍本申请实施例的小区重选的方法400，该方法400包括以下内容。
S401、终端设备接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息。
其中，上述第一候选小区的参数信息可以包括用于判断小区是否符合小区重选条件的参数。例如，对于前文中小区重选准则的场景(a)和场景(c)来说，上述参数信息可以包括用于计算Srxlev或Squal所需的参数。对于小区重选准则的场景(b)来说，上述参数信息可以包括用于计算Rs和Rn所需的参数等。
作为一个示例，在LTE系统中，所述邻区信息可以位于系统消息中的系统信息块类型4(system information block type 4,SIB4)信息、系统信息块类型5(system information block type 5,SIB5)信息和/或系统信息块类型6(system information block type 6,SIB6)信息中。
S402、所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件。
例如，终端设备可以根据第一候选小区的优先级信息，对第一候选小区和当前驻留的小区的优先级进行比较，确定适用于小区重选准则的场景(a)-(c)中的哪一个。然后根据小区测量结果以及参数信息，进一步判断第一候选小区是否满足小区重选条件。
其中，关于上述场景(a)-(c)的小区重选准则的具体内容，可以参考前文中的相关描述，为了简洁，此处不再赘述。
S403、所述终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽。
例如，终端设备可以根据邻区信息获取到第一候选小区的频点信息，并根据第一候选小区的频点信息与第一候选小区进行小区同步，然后接收第一候选小区的系统消息。作为一个示例，在LTE系统中，带宽信息可以是系统消息中的主信息块(master information block,MIB)消息中的dl-Bandwidth(带宽)信息。
S404、在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备从所述服务小区切换至所述第一候选小区。
可选地，所述当前驻留的服务小区也可以称为源小区，所述第一候选小区也可以称为可用小区(suitable cell)。在终端设备确定切换至所述第一候选小区的情况下，所述第一候选小区可称为目标小区。
可选地，在第一候选小区满足小区重选条件的基础上，终端设备还需判断第一候选小区的带宽是否大于预设阈值，只有第一候选小区的带宽大于预设阈值的情况下，终端设备确定切换至第一候选小区。终端设备可以根据S403中获取的带宽信息确定第一候选小区的带宽。
在本申请实施例中，终端设备在小区重选的过程中，选择切换至带宽大于预设阈值的小区上，从而能够保证不会由于带宽原因导致数据传输速率降低，从而提高了用户体验。
在一些示例中，在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备确定继续驻留在当前的服务小区。
在一些示例中，在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备可以在本地将所述第一候选小区标记为被禁止的小区。当第一候选小区被标记为被禁止的小区之后，在预设时间段段内禁止终端设备在所述第一候选小区上驻留。该预设时间段的时长可以根据实践确定，本申请实施例对此不作限定。
例如，当第一候选小区的带宽小于或等于预设阈值的情况下，可以将所述第一候选小区加入到限制带宽的禁止小区列表(cell barred list for limited bandwidth)，以禁止驻留在所述第一候选小区，然后结束小区重选流程。或者也可以不对第一候选小区进行处理，而是确定小区重选失败，从而继续驻留在当前的服务小区中。
作为小区重选方法的一个示例，假设终端设备当前驻留在第二小区B，第一小区A为终端设备的邻小区。根据系统消息，第一小区A的优先级高于第二小区B，并且第一小区A符合现有技术中的小区重选的条件(参见前文中小区重选准则的场景(a))。第一小区A的带宽小于预设阈值，第二小区B的带宽大于预设阈值。若按照现有的小区重选方案，终端设备将切换至第一小区A，由于带宽的限制，终端设备的数据传输速率将远低于用户的预期，从而导致用户体验较差。而在本申请实施例中，由于第一小区A的带宽小于预设阈值，因此，终端设备并不会切换至第一小区A，而是继续驻留在第二小区B。
另外，若终端设备在之前的小区选择或小区重选过程中搜索到第一小区A，则会在本地将第一小区A标记为优先级最低的小区，因此，在小区重选过程中，不会优先考虑第一小区A，从而保证终端设备的数据传输速率，提高用户体验。
图5是本申请又一实施例的小区重选方法的流程示意图。如图5所示，该小区重选方法500的流程如下。
S501、终端设备驻留在源小区。
S502、终端设备对候选小区进行小区测量，并根据小区测量的结果确定开始小区重选流程。
S503、若候选小区满足小区重选条件，终端设备获取候选小区的带宽信息。
其中，小区重选条件如前文所述，此处不再赘述。
可选地，终端设备可以确定自身是否存储有候选小区的带宽信息。若未存储候选小区的带宽信息，则终端设备可以通过接收候选小区的系统消息获取候选小区的带宽信息，候选小区的系统消息中包括带宽信息。
可选地，若候选小区不满足小区重选条件，终端设备继续执行小区测量和小区重选流程。
S504、终端设备根据候选小区的带宽信息，确定是否从源小区切换至候选小区。
例如，若候选小区的带宽大于预设阈值，则终端设备从源小区切换至候选小区。
例如，若候选小区的带宽小于或等于预设阈值，则终端设备驻留在源小区。可选地，终端设备可以将候选小区添加到限定带宽的禁止小区列表中，并结束小区重选流程。在这种情况下，终端设备在一段时间内禁止驻留在所述候选小区。或者终端设备也可以不对候选小区做任何特殊处理，而是确定小区重选失败，并继续驻留在源小区中。
图6是本申请又一实施例的小区选择和小区重选的方法的流程示意图。图6示出了小区选择和小区重选的详细流程。如图6所示，该方法包括：
S601、终端设备选定PLMN。
例如，终端设备的NAS在预先存储的PLMN列表中进行选网，并选定一个PLMN。 例如，终端设备可以根据优先级排序从PLMN列表中选定PLMN。在选定PLMN之后，终端设备的NAS可以向AS指示与选定的PLMN相关的RAT，并指示终端设备的AS执行小区选择流程。终端设备的AS根据是否存储有PLMN对应的小区信息，执行有存储信息的小区选择流程或者执行初始小区选择流程，该小区信息中包括先验信息。
S602、若终端设备存储有PLMN对应的小区信息，则执行有存储信息的小区选择流程。
其中，小区选择流程用于搜索符合上述第一预设条件的候选小区。例如，终端设备可以根据先验信息中历史驻留小区的频点信息，搜索符合第一预设条件的候选小区。可选地，若根据有存储信息的小区选择流程没有搜索到符合第一预设条件的候选小区，则终端设备执行S603。
S603、若终端设备未存储PLMN对应的小区信息，或者在有存储信息的小区选择流程中没有搜索到符合第一预设条件的候选小区，则执行初始小区选择流程。
其中，初始小区选择流程即在全频段搜索符合第一预设条件的候选小区。
S604、若搜索到符合第一预设条件的候选小区，终端设备判断所述候选小区的带宽是否大于预设阈值。
若通过S602或S603搜索到符合以预设条件的候选小区，则终端设备判断候选小区的带宽是否大于预设阈值。若候选小区的带宽大于预设阈值，则驻留在该候选小区。若候选小区的带宽小于预设阈值，则返回到S602或S603中继续执行小区选择流程。
其中，终端设备可以通过系统消息获取候选小区的带宽信息。例如，候选小区的带宽信息可以为系统消息中的MIB消息中的dl-Bandwidth(带宽)信息。
可选地，在候选小区的带宽大于预设阈值的情况下，若终端设备在选择的PLMN中进行NAS注册时由于一些原因(some causes)被拒绝，则可以执行步骤S608中的任意小区选择流程。
S605、若终端设备在S603和S604中搜索到一个或多个符合第一预设条件的候选小区，但搜索到的所有候选小区的带宽均小于或等于预设阈值，则终端设备在上述候选小区中选择一个小区驻留。若终端设备在S603和S604中未搜索到符合第一预设条件的候选小区，则终端设备执行S608中的任意小区选择流程。
S606、终端设备在从连接态回到空闲态或非激活态的情况下，可以执行离开连接态后的小区选择流程。其中，终端设备首先搜索上一个驻留的小区，并判断是否符合第一预设条件，并执行S604。若上一个驻留的小区不符合第一预设条件，则终端设备执行S602中的有存储信息的小区选择流程。
例如，终端设备在驻留在小区上之后，离开空闲态和/或非激活态，而处于连接态。当终端设备从连接态回到空闲态和/或非激活态时，终端设备可以执行离开连接态后的小区选择流程。其中，在离开连接态后的小区选择流程中，终端设备优先尝试在上一个驻留的服务小区中驻留，若不能驻留，则搜索其它小区并尝试驻留。
S607、终端设备在服务小区中驻留之后，在检测到符合小区重选条件的候选小区时，可以触发小区重选流程。
其中，关于小区重选条件可以参考前文中关于小区重选规则的相关描述，此处不再赘述。在搜索到符合小区重选条件的候选小区之后，终端设备可以执行S604的步骤，以判断是否从驻留的源小区切换到该候选小区。若该候选小区的带宽小于或等于预设阈值，则 可以结束小区重选流程，并重新驻留在源小区中。或者，若没有找到符合重选条件的候选小区时，可以执行S608中的任意小区选择流程。
S608、终端设备执行任意小区选择流程。
若终端设备在小区选择过程中未搜索到符合第一预设条件的候选小区，或者在小区重选过程中未搜索到符合小区重选条件的小区，或者在搜索到符合第一预设条件的候选小区，但在NAS注册被拒绝时，可以执行任意小区选择流程。任意小区选择流程也可以称为任意小区搜索流程，是指终端设备在不能获取正常服务的情况下尝试受限驻留的过程。关于任意小区搜索流程的相关内容可以参考图3中的相关描述，此处不再赘述。
图7是本申请实施例的终端设备700的结构示意图。该终端设备700可以用于执行本申请方法实施例中由终端设备执行的小区选择方法或步骤。如图7所示，该终端设备700包括：搜索单元710、接收单元720和处理单元730。
所述搜索单元710用于搜索第一候选小区。所述接收单元720用于接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的PLMN是非接入层NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；所述处理单元730用于根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；所述处理单元730还用于在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备驻留在所述第一候选小区。
图8是本申请实施例的终端设备800的结构示意图。该终端设备800可以用于执行本申请方法实施例中由终端设备执行的小区重选的方法或步骤。如图8所示，该终端设备800包括：接收单元810和确定单元820。
所述接收单元810用于接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息。所述确定单元820用于根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件。所述接收单元810还用于接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽。所述确定单元820还用于在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备从所述服务小区切换至所述第一候选小区。
图9是本申请又一实施例的终端设备900的结构示意图。该终端设备900可以用于执行本申请方法实施例中由终端设备执行的方法或步骤。如图9所示，该终端设备900包括：
收发器910；
存储器920，用于存储程序；
处理器930，用于执行存储器920中的程序。
在一个示例中，当所述程序被执行时，处理器930用于搜索第一候选小区；通过所述收发器910接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的PLMN是NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中 的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；以及根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；以及在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备驻留在所述第一候选小区。
在另一个示例中，当所述程序被执行时，处理器930用于通过所述收发器910接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息；以及根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件；以及通过所述收发器910接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；以及在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备从所述服务小区切换至所述第一候选小区。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何 熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (26)

  1. 一种小区选择的方法，其特征在于，包括：
    终端设备搜索第一候选小区；
    终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的公共陆地移动网络PLMN是非接入层NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的跟踪区域标识TAI不是漫游禁止的跟踪区域列表中的TAI；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；
    所述终端设备根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；
    在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备驻留在所述第一候选小区。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备不驻留在所述第一候选小区。
  3. 如权利要求1所述的方法，其特征在于，在所述终端设备搜索到的所有符合第一预设条件的候选小区的带宽均小于或等于所述预设阈值的情况下，所述终端设备在符合第一预设条件的候选小区中确定驻留的小区；
    所述第一预设条件包括：
    所述候选小区的PLMN是NAS选择的PLMN，或所述候选小区的PLMN是注册的PLMN，或所述候选小区的PLMN是等价的PLMN列表中的PLMN；所述候选小区是未被禁止的小区；所述候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；Srxlev>0，且Squal>0。
  4. 如权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：在所述第一候选小区的带宽小于或等于预设阈值的情况下，所述终端设备将所述第一候选小区标记为当前无线接入技术RAT内优先级最低的小区，或标记为所述终端设备支持的所有RAT内优先级最低的小区。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述终端设备搜索第一候选小区，包括：
    在本地存储有先验消息的情况下，所述终端设备根据所述先验消息搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
  6. 如权利要求5所述的方法，其特征在于，所述终端设备搜索第一候选小区，还包括：
    在根据所述先验消息未搜索到第一候选小区的情况下，所述终端设备通过全频段搜索确定所述第一候选小区。
  7. 如权利要求1至4中任一项所述的方法，其特征在于，所述终端设备搜索第一候选小区，包括：
    在本地未存储有先验消息的情况下，所述终端设备在全频段搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
  8. 一种小区重选的方法，其特征在于，所述方法包括：
    终端设备接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息；
    所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件；
    所述终端设备接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；
    在所述第一候选小区的带宽大于预设阈值的情况下，所述终端设备从所述服务小区切换至所述第一候选小区。
  9. 如权利要求8所述的方法，其特征在于，所述方法还包括：在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备确定继续驻留在当前服务小区。
  10. 如权利要求8所述的方法，其特征在于，在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，所述终端设备将所述第一候选小区标记为被禁止的小区。
  11. 如权利要求8至10中任一项所述的方法，其特征在于，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：
    所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级大于所述服务小区的优先级；
    所述终端设备根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；
    所述终端设备确定在预设时间段内所述第一候选小区的Srxlev大于第一阈值；以及
    所述终端设备确定在所述服务小区驻留超过一秒。
  12. 如权利要求8至10中任一项所述的方法，其特征在于，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：
    所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级等于所述服务小区的优先级；
    所述终端设备根据所述第一候选小区的参数信息，确定所述第一候选小区的小区排序准则Rn；
    所述终端设备确定Rn大于Rs，Rs表示所述服务小区的小区排序准则。
  13. 如权利要求8至10中任一项所述的方法，其特征在于，所述终端设备根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件，包括：
    所述终端设备根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级小于所述服务小区的优先级；
    所述终端设备根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；
    所述终端设备确定在预设时间段内，所述第一候选小区的Srxlev大于第二阈值，且所述服务小区的Srxlev小于第三阈值；以及
    确定所述终端设备在所述服务小区驻留超过一秒。
  14. 一种芯片，其特征在于，包括：
    处理器，用于从存储器调用计算机程序，当所述计算机程序被执行时，使得安装有所述芯片的终端设备执行以下步骤：
    搜索第一候选小区；
    接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括用于指示以下内容的信息：所述第一候选小区的公共陆地移动网络PLMN是非接入层NAS选择的PLMN，或所述第一候选小区的PLMN是注册的PLMN，或所述第一候选小区的PLMN是等价的PLMN列表中的PLMN；所述第一候选小区是未被禁止的小区；所述第一候选小区的跟踪区域标识TAI不是漫游禁止的跟踪区域列表中的TAI；所述第一候选小区的参数信息；所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；
    根据小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev和小区选择质量值Squal，并确定Srxlev>0，Squal>0；
    在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备驻留在所述第一候选小区。
  15. 如权利要求14所述的芯片，其特征在于，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，确定所述终端设备不驻留在所述第一候选小区。
  16. 如权利要求14所述的芯片，其特征在于，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在搜索到的所有符合第一预设条件的候选小区的带宽均小于或等于所述预设阈值的情况下，在符合第一预设条件的候选小区中确定驻留的小区；
    所述第一预设条件包括：所述候选小区的PLMN是NAS选择的PLMN，或所述候选小区的PLMN是注册的PLMN，或所述候选小区的PLMN是等价的PLMN列表中的PLMN；所述候选小区是未被禁止的小区；所述候选小区的TAI不是漫游禁止的跟踪区域列表中的TAI；Srxlev>0，且Squal>0。
  17. 如权利要求14至16中任一项所述的芯片，其特征在于，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在所述第一候选小区的带宽小于或等于预设阈值的情况下，将所述第一候选小区标记为当前无线接入技术RAT内优先级最低的小区，或标记为所述终端设备支持的所有RAT内优先级最低的小区。
  18. 如权利要求14至17中任一项所述的芯片，其特征在于，在搜索第一候选小区方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在本地存储有先验消息的情况下，根据所述先验消息搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
  19. 如权利要求18所述的芯片，其特征在于，在搜索第一候选小区方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在根据所述先验消息未搜索到第一候选小区的情况下，通过全频段搜索确定所述第一候选小区。
  20. 如权利要求14至17中任一项所述的芯片，其特征在于，在搜索第一候选小区方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在本地未存储有先验消息的情况下，在全频段搜索所述第一候选小区，所述先验消息用于指示历史驻留小区的小区信息。
  21. 一种芯片，其特征在于，包括：
    处理器，用于从存储器调用计算机程序，当所述计算机程序被执行时，使得安装有所 述芯片的终端设备执行以下步骤：
    接收驻留的服务小区的系统消息，所述系统消息中包括邻区信息，所述邻区信息中包括第一候选小区的优先级信息和参数信息；
    根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件；
    接收所述第一候选小区的系统消息，所述第一候选小区的系统消息中包括所述第一候选小区的带宽信息，所述带宽信息用于指示所述第一候选小区的带宽；
    在所述第一候选小区的带宽大于预设阈值的情况下，确定所述终端设备从所述服务小区切换至所述第一候选小区。
  22. 如权利要求21所述的芯片，其特征在于，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，确定所述终端设备继续驻留在当前服务小区。
  23. 如权利要求21所述的芯片，其特征在于，当所述计算机程序被执行时，使得安装有所述芯片的终端设备在所述第一候选小区的带宽小于或等于所述预设阈值的情况下，将所述第一候选小区标记为被禁止的小区。
  24. 如权利要求21至23中任一项所述的芯片，其特征在于，在根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备执行以下步骤：
    根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级大于所述服务小区的优先级；
    根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；
    确定在预设时间段内所述第一候选小区的Srxlev大于第一阈值；以及
    确定所述终端设备在所述服务小区驻留超过一秒。
  25. 如权利要求21至23中任一项所述的芯片，其特征在于，在根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备执行以下步骤：
    根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级等于所述服务小区的优先级；
    根据所述第一候选小区的参数信息，确定所述第一候选小区的小区排序准则Rn；
    确定Rn大于Rs，Rs表示所述服务小区的小区排序准则。
  26. 如权利要求21至23中任一项所述的芯片，其特征在于，在根据所述第一候选小区的优先级信息和参数信息，确定所述第一候选小区满足小区重选条件方面，当所述计算机程序被执行时，使得安装有所述芯片的终端设备执行以下步骤：
    根据所述第一候选小区的优先级信息，确定所述第一候选小区的优先级小于所述服务小区的优先级；
    根据所述第一候选小区的小区测量值和所述第一候选小区的参数信息，确定所述第一候选小区的小区选择接收等级值Srxlev；
    确定在预设时间段内，所述第一候选小区的Srxlev大于第二阈值，且所述服务小区的Srxlev小于第三阈值；以及
    确定所述终端设备在所述服务小区驻留超过一秒。
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