WO2021195993A1 - 小区搜索的方法、装置及系统 - Google Patents

小区搜索的方法、装置及系统 Download PDF

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Publication number
WO2021195993A1
WO2021195993A1 PCT/CN2020/082528 CN2020082528W WO2021195993A1 WO 2021195993 A1 WO2021195993 A1 WO 2021195993A1 CN 2020082528 W CN2020082528 W CN 2020082528W WO 2021195993 A1 WO2021195993 A1 WO 2021195993A1
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WIPO (PCT)
Prior art keywords
cell
rat
plmn
terminal
search
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PCT/CN2020/082528
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English (en)
French (fr)
Inventor
王胜
夏苗方
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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 CN202080001785.8A priority Critical patent/CN113748716B/zh
Priority to PCT/CN2020/082528 priority patent/WO2021195993A1/zh
Publication of WO2021195993A1 publication Critical patent/WO2021195993A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • This application relates to the field of communications, and in particular to a method, device and system for cell search.
  • a possible mode for a terminal to search for a network is: first select a network, select a PLMN, and then according to the search priority order corresponding to the radio access technology (RAT), the search priority is from high to low
  • the order is the fifth-generation (5th-Generation, 5G) wireless access technology, the fourth-generation (4th-generation, 4G) wireless access technology, the third-generation (3rd-Generation, 3G) wireless access technology, and the second
  • the second generation (2G) radio access technology uses the RATs supported by all terminals and the frequency bands supported by each RAT for cell search in turn. If the PLMN broadcast by the searched cell matches the selected PLMN, the network selection is considered successful . Then, the terminal resides in the selected network.
  • SA 5G standalone
  • 4G network architecture 4G network architecture
  • the embodiments of the present application provide a cell search method, device, and system, which are used to improve network search efficiency and reduce time delay.
  • a computing device refers to a device that can be abstracted as a computer system.
  • a computing device that supports wireless communication functions may be referred to as a wireless communication device.
  • the wireless communication device may be the entire computer of the computing device, or part of the device in the computing device, such as a chip related to wireless communication functions, such as a system chip or a communication chip.
  • the system chip is also called system-on-chip, or SoC chip.
  • the wireless communication device may be a terminal such as a smart phone, or may be a system chip or a communication chip that can be set in the terminal.
  • the wireless communication device may be a wireless access network device such as a base station, or a related chip that can be set in the wireless access network device, such as an SoC chip or a communication chip.
  • the communication chip may include a radio frequency processing chip and a baseband processing chip.
  • the baseband processing chip is sometimes called a modem.
  • the communication chip can be integrated inside the SoC chip or not integrated with the SoC chip.
  • the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip.
  • an embodiment of the present application provides a cell search method.
  • the method includes: starting a cell search after powering on or entering a signal coverage area from a signal blind area, and searching for a cell corresponding to the first public land mobile network PLMN identity When it is determined that the cell corresponding to the first PLMN identifier has not been successfully camped on the first RAT within the first preset time period, the cell corresponding to the first PLMN identifier is searched first on the second RAT, where the standard of the second RAT is low Based on the first RAT system.
  • the method may be executed by a communication device, and the communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip.
  • the communication device is a terminal, or a chip set in the terminal for realizing the function of the terminal, or other component for realizing the function of the terminal.
  • the communication device is an example of a terminal.
  • the cell search is initiated.
  • the terminal determines that the terminal is not on the first RAT within the first preset time period. You have successfully camped on the cell corresponding to the first PLMN ID. In this case, if you search for the cell corresponding to the first PLMN ID on the first RAT, you cannot find the cell corresponding to the first PLMN ID that can provide communication services for the terminal. This is equivalent to searching for the cell corresponding to the first PLMN identity on the invalid RAT.
  • the terminal preferentially searches for the cell corresponding to the first PLMN identity on the second RAT, and skips on the invalid first RAT.
  • communication services can be obtained faster, thereby improving network search efficiency and reducing time delay.
  • the method further includes: when the terminal searches for the first cell on the second RAT, camping on the first cell, where the first cell supports the second RAT and corresponds to the first PLMN identity Community.
  • the terminal can camp on the first cell when searching for the first cell corresponding to the first PLMN identity on the second RAT, so as to obtain the communication service of the first cell.
  • the method further includes: when any of the following conditions is met, the terminal switches or reselects from the first cell to the second cell, where the second cell supports the first RAT and corresponds to the first PLMN The identified cell, and the second cell is the cell with the best signal quality among the neighboring cells of the first cell; where:
  • Condition 1 After starting intra-frequency measurement, the signal quality of the second cell is greater than the signal quality of the first cell within a second preset time period;
  • Condition 2 After the inter-frequency or inter-system measurement is started, the signal quality of the second cell is greater than the signal quality of the first cell within the second preset time period, and the frequency point corresponding to the second cell takes precedence The level is equal to the frequency priority of the first cell;
  • Condition 3 After starting the inter-frequency or inter-system measurement, the signal quality of the second cell within the second preset time period is greater than the first preset threshold, and the frequency point priority corresponding to the second cell Higher than the frequency priority of the first cell;
  • Condition 4 After the inter-frequency or inter-system measurement is started, the signal quality of the first cell within the second preset time period is less than a second preset threshold, and the signal quality of the second cell is greater than the third A threshold is preset, and the frequency priority corresponding to the second cell is lower than the frequency priority of the first cell.
  • the terminal After the terminal camps on the first cell, it can switch from the first cell or reselect to the second cell corresponding to the first PLMN with better service quality, so that it can be in the second cell under the first RAT. Get better communication services.
  • the method further includes: when the terminal searches for the cell corresponding to the first PLMN identifier after the terminal is powered on next time or enters the signal coverage area from the signal blind zone, the terminal preferentially searches for the first PLMN on the first RAT Identify the corresponding cell.
  • the terminal is handing over or reselecting to the second cell, indicating that the terminal has successfully camped on the cell corresponding to the first PLMN identification.
  • the first PLMN When searching for the cell corresponding to the identification, the cell corresponding to the first PLMN identification is preferentially searched on the first RAT, which helps to quickly obtain the communication service provided by the cell supporting the first RAT.
  • preferentially searching for the cell corresponding to the first PLMN identity on the first RAT includes: when the distance between the first position and the second position of the terminal is less than a preset distance threshold, preferentially searching for the cell corresponding to the first PLMN Search for the cell corresponding to the first PLMN identification on the RAT; where the first location is the current location of the terminal, and the second location is the location corresponding to the first PLMN identification after the terminal was powered on the last time or entered the signal coverage area from the blind zone. The location of the cell when searching.
  • the terminal when the terminal searches for the cell corresponding to the first PLMN identity after it is powered on or enters the signal coverage area from the signal blind area, by comparing the position changes of the two searches, the distance between the two searched positions is less than the expected distance.
  • Set the distance threshold indicating that the terminal has a small moving distance.
  • the terminal will preferentially search for the cell corresponding to the first PLMN identity on the first RAT, and it can also search for the cell corresponding to the first PLMN identity in the second position, which is helpful
  • the communication service provided by the cell corresponding to the first PLMN identity can be quickly obtained, so that the network search efficiency can be improved and the time delay can be reduced.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • an embodiment of the present application provides a method for cell search applied to a terminal.
  • the method includes: starting a cell search after powering on or entering a signal coverage area from a signal blind area; When searching for the cell of, it is determined that the terminal has successfully camped on the cell corresponding to the first PLMN identity on the first RAT within the first preset time period; preferentially searches for the cell corresponding to the first PLMN identity on the first RAT.
  • the method may be executed by a communication device, and the communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip.
  • the communication device is a terminal, or a chip set in the terminal for realizing the function of the terminal, or other component for realizing the function of the terminal.
  • the communication device is an example of a terminal.
  • the cell search is initiated.
  • the terminal determines that the terminal has successfully camped on the first RAT within the first preset period of time
  • the terminal preferentially searches for the cell corresponding to the first PLMN identification on the first RAT, and can quickly obtain the communication service provided by the cell corresponding to the first PLMN identification, thereby It can improve the efficiency of network search and reduce time delay.
  • preferentially searching for the cell corresponding to the first PLMN identity on the first RAT includes: when the distance between the first position and the second position of the terminal is less than a preset distance threshold, preferentially searching for the cell corresponding to the first PLMN Search for the cell corresponding to the first PLMN identification on the RAT; where the first location is the current location of the terminal, and the second location is the location corresponding to the first PLMN identification after the terminal was powered on the last time or entered the signal coverage area from the blind zone. The location of the cell when searching.
  • the terminal when the terminal searches for the cell corresponding to the first PLMN identifier after powering on or entering the signal coverage area from the signal blind zone, the distance between the two searched positions is less than the preset by comparing the changes in the positions of the two searches.
  • the distance threshold indicates that the terminal has a small moving distance.
  • the terminal preferentially searches for the cell corresponding to the first PLMN identity on the first RAT, and can also search for the cell corresponding to the first PLMN identity in the second position, which is helpful for fast
  • the communication service provided by the cell corresponding to the first PLMN identity is acquired, so that the efficiency of network search can be improved.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • an embodiment of the present application provides a communication device, the communication device (hereinafter referred to as the device) has a function of implementing the steps performed in the method example of the first aspect described above.
  • the device can be located in the terminal device or the chip corresponding to the terminal device.
  • the above-mentioned functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the structure of the communication device includes a starting unit, a determining unit, and a searching unit, and these units can execute the corresponding steps or functions performed by the terminal in the method example of the first aspect.
  • the starting unit is used to start the cell search after powering on or entering the signal coverage area from the signal blind zone;
  • the determining unit is used to determine the first preset when searching for the cell corresponding to the first public land mobile network PLMN identity The cell corresponding to the first PLMN identification has not been successfully camped on the first RAT within the time period;
  • the searching unit is used to search for the cell corresponding to the first PLMN identification on the second RAT first, wherein the standard of the second RAT is lower than that of the first The standard of RAT.
  • the communication device further includes a processing unit, configured to: when the first cell is searched for on the second RAT, camp on the first cell, where the first cell supports the second RAT and corresponds to the first cell A cell identified by a PLMN.
  • the processing unit is further configured to: when any of the following conditions is met, handover or reselect from the first cell to the second cell, where the second cell supports the first RAT and corresponds to The cell identified by the first PLMN, and the second cell is the cell with the best signal quality among the neighboring cells of the first cell;
  • Condition 1 After starting intra-frequency measurement, the signal quality of the second cell is greater than the signal quality of the first cell within a second preset time period;
  • Condition 2 After the inter-frequency or inter-system measurement is started, the signal quality of the second cell is greater than the signal quality of the first cell within the second preset time period, and the frequency point corresponding to the second cell takes precedence The level is equal to the frequency priority of the first cell;
  • Condition 3 After starting the inter-frequency or inter-system measurement, the signal quality of the second cell within the second preset time period is greater than the first preset threshold, and the frequency point priority corresponding to the second cell Higher than the frequency priority of the first cell;
  • Condition 4 After the inter-frequency or inter-system measurement is started, the signal quality of the first cell within the second preset time period is less than a second preset threshold, and the signal quality of the second cell is greater than the third A threshold is preset, and the frequency priority corresponding to the second cell is lower than the frequency priority of the first cell.
  • the search unit is also used to search for the cell corresponding to the first PLMN identity after the next power-on or enter the signal coverage area from the signal blind zone, and to search for the first PLMN identity on the first RAT first The corresponding cell.
  • the search unit is specifically configured to: when the distance between the first position and the second position of the communication device is less than a preset distance threshold, preferentially search for the cell corresponding to the first PLMN identifier on the first RAT ;
  • the first location is the location where the communication device is currently located
  • the second location is the location when the communication device was searched for the cell corresponding to the first PLMN identifier after the last time the communication device was turned on or entered the signal coverage area from the signal blind zone.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • the structure of the communication device includes a starting unit, a determining unit, and a searching unit, and these units can execute the corresponding steps or functions performed by the terminal in the method example of the first aspect described above.
  • the starting unit is used to start the cell search after powering on or entering the signal coverage area from the signal blind zone;
  • the determining unit is used to determine the first preset when searching for the cell corresponding to the first public land mobile network PLMN identity The cell corresponding to the first PLMN identity has been successfully camped on the first RAT within the time period;
  • the searching unit is configured to preferentially search for the cell corresponding to the first PLMN identity on the first RAT.
  • the search unit is specifically configured to: when the distance between the first position and the second position of the communication device is less than a preset distance threshold, preferentially search for the cell corresponding to the first PLMN identifier on the first RAT ;
  • the first location is the location where the communication device is currently located
  • the second location is the location when the communication device was searched for the cell corresponding to the first PLMN identifier after the last time the communication device was turned on or entered the signal coverage area from the signal blind zone.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • the communication device has the function of implementing the above method, which includes a method for implementing any one of the first aspect or the first aspect, or executing any one of the second aspect or the second aspect.
  • the steps or functions can be realized by software, or by hardware (such as a circuit), or by a combination of hardware and software.
  • the device may be a terminal or a chip on the terminal.
  • the foregoing apparatus includes one or more processors and communication units.
  • One or more processors are configured to support the communication device to perform corresponding functions in the above-mentioned methods.
  • the communication device may further include one or more memories, where the memory is used for coupling with the processor and stores necessary program instructions and/or data of the device.
  • One or more memories may be integrated with the processor, or may be provided separately from the processor. This application is not limited.
  • the foregoing communication device includes a transceiver, a processor, and a memory.
  • the processor is used to control the transceiver or the input/output circuit to send and receive signals
  • the memory is used to store a computer program
  • the processor is used to run the computer program in the memory, so that the communication device executes the first aspect or any one of the first aspect.
  • the method completed in the possible implementation manners, or the method completed in the second aspect or any one of the possible implementation manners of the second aspect is executed.
  • a computer-readable storage medium is provided.
  • the computer-readable storage medium is used to store computer instructions.
  • the computer instructions When the computer instructions are executed on a computer, the computer can execute the first aspect or any one of the above.
  • the method described in the possible implementation manners, or the method completed in the second aspect or any one of the possible implementation manners of the second aspect is executed.
  • a computer program product is provided.
  • the computer program product is used to store computer instructions.
  • the computer instructions When the computer instructions are run on a computer, the computer can execute the first aspect or any one of the possibilities.
  • the method described in the implementation manner, or the method described in the second aspect or any one of the possible implementation manners of the second aspect is performed.
  • a communication device such as a chip system, which is coupled with a memory, and the communication device calls the program instructions stored in the memory during operation, so that the first aspect or any one of the above-mentioned first aspect may be realized
  • the method in the manner is executed, or the method described in the second aspect or any one of the possible implementation manners of the second aspect is executed.
  • a communication system including: a network device, and a communication device in any possible implementation manner of the third aspect to the fourth aspect.
  • the network device may be a wireless interface such as a base station.
  • the network access device may also be a related chip that can be set in the wireless access network device, such as an SoC chip or a communication chip.
  • FIG. 1 is a schematic diagram of the architecture of a communication system to which an embodiment of this application is applicable;
  • FIG. 2 is a schematic diagram of a network selection process provided by an embodiment of this application.
  • FIG. 3 is a schematic flowchart of a cell search method provided by an embodiment of this application.
  • FIG. 4 is a schematic flowchart of another cell search method provided by an embodiment of this application.
  • FIG. 5 is a schematic flowchart of another cell search method provided by an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • the embodiments of this application can be applied to mobile communication systems, such as global system for mobile communications (GSM), general packet radio service (GPRS) communication systems, code division multiple access (code division multiple access) multiple access (CDMA) communication system, wideband code division multiple access (WCDMA) communication system, time-division code division multiple access (TD-SCDMA) communication system, long-term evolution (long-term evolution) Term evolution, LTE) communication systems, fifth generation (5th Generation, 5G) communication systems (such as next-generation radio (NR) systems), future communication systems, etc.
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • TD-SCDMA time-division code division multiple access
  • LTE long-term evolution
  • 5G fifth generation
  • FIG. 1 it is a schematic diagram of the architecture of a communication system to which the embodiments of this application are applicable.
  • the communication system shown in FIG. 1 includes a network device 101 and a
  • the network device 101 includes an access network device, such as a base station (for example, an access point), which may be a device that communicates with a wireless terminal device through one or more cells through an air interface in an access network, for example, an access point.
  • the network equipment may include a base transceiver station (BTS) in a GSM communication system or a CDMA communication system, a node B (node B) in a WCDMA communication system, and an evolutional node B (evolutional node B) in an LTE communication system.
  • BTS base transceiver station
  • node B node B
  • WCDMA WCDMA communication system
  • evolutional node B evolutional node B
  • eNB evolutional node B
  • gNB in the NR system, etc.
  • the device used to implement the function of the network device may be a network device, or a device capable of supporting the network device to implement the function, such as a chip system, and the device may be installed in the network device.
  • the device used to implement the functions of the network equipment is a network device as an example to describe the technical solutions provided in the embodiments of the present application.
  • the terminal device 102 includes a device that provides voice and/or data connectivity to the user, specifically, includes a device that provides voice to the user, or includes a device that provides data connectivity to the user, or includes a device that provides voice and data connectivity to the user device of. For example, it may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem.
  • the terminal device can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • RAN radio access network
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and wireless terminals in transportation safety , Wireless terminals in smart cities, wireless terminals in smart homes, user equipment (UE), etc.
  • the terminal device is described below by taking a terminal as an example.
  • a computing device refers to a device that can be abstracted as a computer system.
  • a computing device that supports wireless communication functions may be referred to as a wireless communication device.
  • the wireless communication device may be the complete computer of the computing device, or part of the device in the computing device, such as a chip related to wireless communication functions, such as a system chip or a communication chip.
  • the system chip is also called system-on-chip, or SoC chip.
  • the wireless communication device may be a terminal device such as a smart phone, or may be a system chip or a communication chip that can be set in the terminal device.
  • the wireless communication device may be a wireless access network device such as a base station, or a related chip that can be set in the wireless access network device, such as an SoC chip or a communication chip.
  • the communication chip may include a radio frequency processing chip and a baseband processing chip.
  • the baseband processing chip is sometimes called a modem.
  • the communication chip can be integrated inside the SoC chip or not integrated with the SoC chip.
  • the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip.
  • the public land mobile network is a network established and operated for the purpose of providing land mobile communication services to the public.
  • the network is usually interconnected with the public switched telephone network (PSTN) to form a regional or national-scale communication network .
  • the PLMN identifier includes a mobile country code (Mobile Country Code, MCC) and a mobile network code (Mobile Network Code, MNC).
  • MCC Mobile Country Code
  • MNC Mobile Network Code
  • the MCC is 460, which means China
  • MNC Mobile Network Code
  • China Mobile’s PLMN ID can be 46000, 46002, 46007, 46008, and for example, China Unicom’s PLMN ID is 46001, 46006, 46009 .
  • At least one refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects before and after are in an “or” relationship.
  • the following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • the terminal when the terminal is turned on or enters the signal coverage area from the signal blind area, it will search for the network in order to find a suitable network to provide communication services for the terminal.
  • the terminal first selects the network, and then the network registration process is performed after the network selection is successful. Detailed description.
  • the purpose of network selection is to search for cell signals in the network corresponding to the current PLMN identity, and identify the PLMN identity corresponding to the cell based on the information broadcast by the cell. If the terminal expects to select the PLMN identity that matches the PLMN identity broadcast by the cell, the network is considered The selection is successful.
  • FIG. 2 is a schematic diagram of a network selection process provided by an embodiment of this application.
  • Step 201 In a scenario where the terminal is powered on or enters the signal coverage area from the signal blind area, the terminal selects a PLMN for network selection.
  • Step 202 The terminal selects a RAT to start network selection.
  • Step 203 The terminal selects a band under the RAT to start network selection.
  • Step 204 The terminal selects a certain frequency point in the frequency band under the RAT to start a network search.
  • Step 205 The terminal performs a cell search under a certain frequency point in the frequency band under the RAT, and matches the PLMN identity broadcast by the searched cell with the PLMN identity selected by the terminal.
  • step 206 the terminal determines whether the matching is successful; if so, execute step 207; if not, execute step 208.
  • Step 207 The network selection is successful, and a registration process is initiated to the network corresponding to the PLMN ID.
  • Step 208 Continue to select the next frequency point in the frequency band under the RAT for cell search.
  • Step 209 If the search for all frequency points in the frequency band under the RAT is completed, and no cell with a PLMN identity matching the PLMN identity selected by the terminal is found, the terminal selects the next frequency band under the RAT for network search.
  • Step 210 If the search for all frequency bands under the RAT is completed, and no cell with a PLMN identity matching the PLMN identity selected by the terminal is found, the UE selects the next RAT under the PLMN to search.
  • Step 211 If all RATs under the PLMN have been searched, and no cell matching the PLMN identity with the PLMN identity selected by the terminal has been searched, then this round of network search fails, and the next PLMN identity is selected for network selection until the network selection is successful .
  • this round of network search fails, and the next PLMN identity is selected for network selection until the network selection is successful .
  • the next PLMN identity for network selection refer to the above steps 201 to 211.
  • the terminal when the terminal is powered on or after recovering from coverage, the terminal uses the access technology it supports and the band supported by each access technology to perform network search.
  • the RAT performs network search according to 5G, 4G, 3G and 2G search in turn, and then select a suitable PLMN. After the terminal successfully selects the PLMN, it tries to perform the network registration process.
  • the 5G network may include independent networking (stand alone, SA) and non-stand alone networking (non-stand alone, NSA).
  • the terminal when the terminal searches for the network corresponding to 46000, it will first search for the SA network on the frequency band supported by 5G. If the SA network is not searched within a certain period of time, then Search for the NSA network on the frequency band supported by 5G. If the NSA network is not found on the frequency band supported by 5G within a certain period of time, search for the network on the frequency band supported by 4G. If the corresponding PLMN identification is not found on the frequency band supported by 4G for a certain period of time If the network corresponding to the PLMN ID is not found in the frequency band supported by 3G/2G within a certain period of time, it means that the search for the network corresponding to 46000 has failed.
  • Reselect a PLMN ID Continue to search for the network corresponding to the newly selected PLMN ID in sequence according to 5G, 4G, 3G, and 2G, and so on, until a network matching the selected PLMN ID is searched, that is, the network selection is successful.
  • Network registration is used to register user information on the network and establish user context in the network so that the network can identify users and provide users with different network services.
  • the process of registering user information may include authentication, authentication, and other processes.
  • the signaling interaction between the terminal and the network device is as follows: Steps S1 to S6:
  • the terminal sends a registration request to the network device, where the registration request is used to request registration to the network corresponding to the selected PLMN identifier.
  • the network device sends an identity request (identity request) message to the terminal, and the identity request message is used to request to obtain the identity information of the terminal.
  • identity request identity request
  • the terminal sends an identity request (identity request) message to the network device, where the identity request message includes the identity information of the terminal.
  • S4 The network device sends an authentication request message to the terminal, and the authentication request message includes authentication information.
  • the terminal sends an authentication response message to the network device.
  • the authentication response message includes the authentication value calculated by the terminal according to the authentication information, so that the network device can verify the identity of the terminal according to the authentication value, and execute it after the authentication is successful.
  • the network device sends a response message indicating successful registration to the terminal.
  • many current terminals support 5G SA network architecture, but each operator has not yet deployed the network architecture of 5G SA network architecture.
  • the network construction status of each operator is preset. In this way, when the terminal needs to search the network corresponding to a certain PLMN ID, it reads the preset information. If the configured preset information does not include a certain RAT, that is, when the network corresponding to the PLMN ID to be searched does not support a certain RAT, For example, if the RAT is 5G, the terminal skips the 5G search, or lowers the priority of the 5G search.
  • each operator may adopt different network architecture deployments in different regions.
  • the terminal needs to collect a large amount of data for each PLMN and needs to be preset in the terminal in advance, and the terminal cannot effectively collect all of the global operators. Only the information of individual operators can be selected to be pre-configured in the terminal, which causes the terminal to search the network for invalid RATs, which leads to a longer time for users to obtain services.
  • the terminal supports the 5G SA network architecture, and the operator has already carried out the network construction of the 5G SA network architecture, but the terminal that supports the 5G SA network architecture has not opened an account, then even if the terminal searches for the 5G SA network, it cannot be used in the 5G SA network. If the network registration is successful, the terminal cannot obtain the 5G SA network service. In this case, even the SA network searched by the terminal is meaningless. In this case, the 5G SA search network process is also the process of invalid RAT search network. It will also lead to a longer time for users to obtain services.
  • FIG. 3 a schematic flowchart of a method for cell search is provided in an embodiment of this application.
  • This method may be executed by a terminal or a component of the terminal (such as a chip, a circuit, etc.).
  • the terminal takes the terminal to execute the method as an example for description.
  • the method includes the following steps:
  • Step 301 After the terminal is powered on or enters the signal coverage area from the signal blind area, a cell search is started.
  • the signal blind area may be an area without network signal coverage, and the signal coverage area may be an area covered by network signals.
  • Step 302 When searching for the cell corresponding to the first PLMN identity, the terminal determines that the cell corresponding to the first PLMN identity has not been successfully camped on the first RAT within the first preset time period.
  • step 302 the cell corresponding to the first PLMN identifier has not been successfully camped on the first RAT, which may mean that the cell corresponding to the first PLMN identifier has not been successfully camped on all frequency bands supported by the first RAT.
  • the specific value of the first preset duration is not limited, and will not be described in detail later.
  • step 302 may have multiple possible implementation manners, including but not limited to the following two implementation manners:
  • the terminal has never successfully camped on the cell corresponding to the first PLMN identifier on the frequency band supported by the first RAT before powering on this time or entering the signal coverage area from the signal blind zone.
  • the cell corresponding to the first PLMN identifier has been searched for many times within a period of time, but the cell corresponding to the first PLMN identifier has not been successfully camped on.
  • the terminal has successfully camped on the cell corresponding to the first PLMN identifier on the frequency band supported by the first RAT before powering on this time or entering the signal coverage area from the signal blind area.
  • the cell corresponding to the first PLMN identifier is successfully camped on the frequency band supported by the RAT to start timing, and it ends when the search for the cell corresponding to the first PLMN identifier is performed after this power-on or entering the signal coverage area from the signal blind area. This period of time has exceeded the first PLMN identifier.
  • a preset duration In this case, it can be determined that the cell corresponding to the first PLMN identifier has not been successfully camped on the first RAT within the first preset duration.
  • the embodiment of the present application does not limit the specific implementation manner of determining that the cell corresponding to the first PLMN identity has not successfully camped on the frequency band supported by the first RAT within the first preset time period.
  • a possible implementation manner may be: the terminal stores record information that the cell corresponding to the first PLMN identity has successfully camped on the frequency band supported by the first RAT is stored in the terminal.
  • the terminal stores record information that the cell corresponding to the first PLMN identity has successfully camped on the frequency band supported by the first RAT is stored in the terminal.
  • the terminal when the terminal successfully camps on the cell corresponding to the SA network on the frequency band supported by 5G, it will record that it has successfully camped on the cell corresponding to the SA network on the frequency band supported by 5G. , And the record information of the successful stay time.
  • the terminal When the terminal is turned on the next time or enters the signal coverage area from the signal blind area, when searching for the cell corresponding to the SA network, it is judged whether the storage time corresponding to the record information exceeds the first preset If the duration exceeds the first preset duration, the record information will be deleted.
  • the embodiment of this application does not limit the specific representation of the record information, such as recording in a collective manner, which can be understood as all PLMN identities corresponding to the cells that have successfully camped on the frequency band supported by each RAT constitute the PLMN set corresponding to the RAT .
  • the terminal can search for the first PLMN ID in the PLMN set corresponding to 5G. If the first PLMN ID is found, it means that the terminal has successfully camped on the first PLMN ID corresponding to the frequency band supported by 5G. Cell; if the first PLMN identity is not found, it means that the terminal has not successfully camped on the cell corresponding to the first PLMN identity on the frequency band supported by 5G.
  • recording in the form of a list can be understood as recording all the PLMN identities corresponding to each RAT and the cells successfully registered on the frequency band supported by the RAT in the list, for example, expressed as [RAT, PLMN identity].
  • Step 303 The terminal preferentially searches for the cell corresponding to the first PLMN identity on the second RAT.
  • the standard of the second RAT is lower than the standard of the first RAT.
  • the order of the RAT system from high to low is: fifth-generation 5G wireless access technology, fourth-generation 4G wireless access technology, third-generation 3G wireless access technology, and second-generation 2G wireless access technology .
  • the first RAT may be 5G
  • the second RAT may be any of 4G, 3G, and 2G.
  • the first RAT may be 4G
  • the second RAT may be 3G or 2G.
  • the first RAT may be 3G
  • the second RAT may be 2G
  • the specific implementation manner for the terminal to preferentially search for the cell corresponding to the first PLMN identity on the second RAT is not limited.
  • the implementation manner may include, but is not limited to:
  • Method 1 First search for the cell corresponding to the first PLMN ID on the frequency band supported by the second RAT. If the cell corresponding to the first PLMN ID is not found on the frequency band supported by the second RAT, then, search for the cell corresponding to the first PLMN ID on the frequency band supported by the first RAT. Search for the cell corresponding to the first PLMN identity; if the cell corresponding to the first PLMN identity is successfully searched on the frequency band supported by the second RAT, camp on the cell corresponding to the first PLMN identity and send the searched first PLMN identity The corresponding cell performs the network registration process. Among them, the network registration process here can refer to the relevant content of the aforementioned network registration, which will not be repeated here.
  • Manner 2 Only search for the cell corresponding to the first PLMN identity on the frequency band supported by the second RAT.
  • the cell corresponding to the first PLMN identity can be searched on the frequency band supported by other RATs except the first RAT and the second RAT, or, You can re-select other PLMN identities to continue searching for the cell. If the cell corresponding to the first PLMN identity is successfully searched on the frequency band supported by the second RAT, the cell corresponding to the first PLMN identity is camped on, and the network registration procedure is performed to the cell corresponding to the searched first PLMN identity.
  • the network registration process here can refer to the relevant content of the aforementioned network registration, which will not be repeated here.
  • the cell corresponding to the first PLMN identity is successfully searched on the frequency band supported by the second RAT, camp on the cell corresponding to the first PLMN identity, and camp on the cell corresponding to the first PLMN identity successfully. Later, the first PLMN identity can be recorded, so that when the cell corresponding to the first PLMN identity is searched after a power-on, it can be determined that the cell corresponding to the first PLMN identity has been successfully camped on the frequency band supported by the second RAT. Avoiding the process of searching for the cell corresponding to the first PLMN identity on an invalid RAT helps to obtain communication services faster, thereby improving the efficiency of network search.
  • the terminal after the terminal is powered on or enters the signal coverage area from the signal blind area, it starts the cell search.
  • searching for the cell corresponding to the first PLMN identity it is determined to be on the frequency band supported by the first RAT within the first preset period of time. Unsuccessfully camped on the cell corresponding to the first PLMN ID. In this case, if the cell corresponding to the first PLMN ID is searched on the first RAT, the cell corresponding to the first PLMN ID that can provide communication services for the terminal cannot be found.
  • this is equivalent to searching for the first PLMN identifier corresponding to a cell in an invalid RAT, and therefore in this case, the terminal search priority on the second RAT corresponding to the first cell PLMN identity, the first skip invalid RAT
  • communication services can be obtained faster, thereby improving network search efficiency and reducing time delay.
  • the terminal preferentially searches for the cell corresponding to the first PLMN identity on the frequency band supported by the second RAT. For example, when searching for the first cell corresponding to the first PLMN identity on the second RAT, the terminal camps on The first cell in order to obtain the communication service of the first cell.
  • the terminal After the terminal camps in the first cell, in order to ensure the stability and better performance of the network service, the terminal measures the signal quality of the first cell and the neighboring cells of the first cell in the idle state, so as to obtain information from the neighboring cells. Select an optimal cell for cell reselection, or, in the connected state, the terminal can measure the signal quality of the first cell and the neighboring cells of the first cell to select an optimal cell from the neighboring cells.
  • Cell handover provides communication services for the terminal.
  • the signal quality in the first cell of the terminal satisfies: select the received level (Srxlev) to be less than or equal to the same frequency measurement start power threshold (SIntraSearchP), and select the received signal quality (Squal) to be less than or equal to the same frequency measurement start quality Threshold (SIntraSearchQ), start the same frequency measurement.
  • the signal quality in the first cell of the terminal satisfies: select the reception level (Srxlev) to be less than or equal to the inter-frequency and inter-system measurement start power threshold (SnonIntraSearchP) (SIntraSearchP), and select the received signal quality (Squal) to be less than or equal to the inter-frequency and inter-system measurement start power threshold System measurement start quality threshold (SnonIntraSearchQ), start different frequency or different system measurement.
  • the terminal after the terminal starts co-frequency measurement, when the signal quality of the second cell is greater than the signal quality of the first cell within the second preset time period, the terminal can switch from the first cell or reselect to the second cell.
  • the second cell the second cell is the cell with the highest signal quality among the neighboring cells of the first cell.
  • the terminal after the terminal starts inter-frequency or inter-system measurement, the signal quality of the second cell is greater than the signal quality of the first cell within the second preset time period, and the frequency point priority corresponding to the second cell is When it is equal to the frequency priority of the first cell, the terminal can switch from the first cell or reselect to the second cell, and the second cell is the cell with the highest signal quality among the neighboring cells of the first cell.
  • the signal quality of the second cell within the second preset period of time is greater than the first preset threshold, and the frequency point corresponding to the second cell takes precedence.
  • the terminal can switch from the first cell or reselect to the second cell, and the second cell is the cell with the highest signal quality among the neighboring cells of the first cell.
  • the frequency priority of the second cell is lower than the frequency priority of the first cell, and the frequency priority of the first cell within the second preset time period is lower than that of the first cell.
  • the terminal can switch from the first cell or reselect to the second cell, and the second cell is the first The cell with the highest signal quality among the neighboring cells of the cell.
  • the terminal can switch from the first cell or reselect to a second cell with better service quality.
  • the second cell is a cell that supports the first RAT and corresponds to the first PLMN identity, so that the terminal can be in the first cell.
  • the second cell under the RAT obtains better communication services.
  • the terminal switches or reselects to the second cell, indicating that the terminal has successfully camped on the cell corresponding to the first PLMN identifier on the first RAT. After that, the terminal can also switch on or switch from the signal blind zone next time. After entering the signal coverage area, when searching for the cell corresponding to the first PLMN identity, the terminal preferentially searches for the cell corresponding to the first PLMN identity on the first RAT. This helps to quickly obtain the information provided by the cell that supports the first RAT. Communication service.
  • the terminal can also determine the current location of the terminal. Whether the location has changed from the location where the cell corresponding to the first PLMN identity was searched last time, to determine whether to preferentially search for the cell corresponding to the first PLMN identity on the first RAT.
  • the cell corresponding to the first PLMN identity is preferentially searched on the first RAT; wherein, the first position is the current terminal Where it is located, the second location is the location when the terminal was last powered on or entered the signal coverage area from the signal blind area when searching for the cell corresponding to the first PLMN identifier. Since the distance between the two searched locations is less than the preset distance threshold, it indicates that the terminal has a small moving distance.
  • the terminal will preferentially search for the cell corresponding to the first PLMN identifier on the first RAT, that is, it can also be in the second location Searching for the cell corresponding to the first PLMN identifier helps to quickly obtain the communication service provided by the cell corresponding to the first PLMN identifier, thereby improving the efficiency of network search.
  • the terminal after the terminal is powered on at location A or enters the signal coverage area from the signal blind zone, it starts a cell search.
  • searching for the cell corresponding to the first PLMN identity it successfully searches for the first PLMN identity corresponding to the first RAT.
  • the terminal moves from location A to location B, and the distance between location B and location A is greater than the preset distance threshold, and the terminal at location B has priority in the second Searching for the cell corresponding to the first PLMN identity on the frequency band supported by the RAT, the terminal can successfully search for the cell B corresponding to the first PLMN identity on the second RAT.
  • location A is Shanghai
  • location B is Hefei
  • the user of the terminal is traveling from Shanghai to Hefei on a business trip.
  • Hefei he can search for the cell corresponding to the first PLMN identification on the frequency band supported by the second RAT.
  • the user who returned from Hefei to Shanghai can search for the cell corresponding to the first PLMN identification on the frequency band supported by the first RAT first, so as to avoid wasting time by searching for the first RAT in a location that does not support the first RAT , So that you can search for a cell that can provide network services as soon as possible.
  • the terminal camps on the second cell, and the PLMN identity broadcast by the second cell can be the first PLMN identity. Then the terminal can correspond to the first PLMN identity after it is powered on next time or enters the signal coverage area from the signal blind zone.
  • the cell corresponding to the first PLMN identity is first searched for in the frequency band supported by the first RAT.
  • the PLMN identity broadcast by the second cell may also be the second PLMN identity.
  • the second PLMN identity is any PLMN identity other than the first PLMN identity.
  • the cell corresponding to the second PLMN identifier is preferentially searched on the frequency band supported by the first RAT.
  • the corresponding record information can be generated.
  • the record information is recorded as a PLMN set, and the terminal can Record the first PLMN identifier in the PLMN set corresponding to the first RAT.
  • the terminal needs to search for the cell corresponding to the first PLMN identifier the next time it is powered on or enters the signal coverage area from the blind zone, the first RAT can be determined first.
  • the cell corresponding to the first PLMN identity is preferentially searched on the frequency band supported by the first RAT; If the first PLMN identity is not included in the PLMN set corresponding to a RAT, the cell corresponding to the first PLMN identity is searched first in the frequency band supported by the second RAT.
  • the terminal may successfully camp on the cell corresponding to the first PLMN identity in a certain location on the frequency band supported by the first RAT, and record the first PLMN identity in the PLMN set corresponding to the first RAT, after a period of time, the terminal If you move to another location that does not support the first RAT, if you search for the cell corresponding to the first PLMN identity on the frequency band supported by the first RAT, it will cause the search process for invalid RATs, and prolong the terminal's location in another location area.
  • the terminal can successfully camp on the cell corresponding to the first PLMN identifier on the frequency band supported by the first RAT, and record the successful camping
  • the first PLMN identifies the time of the corresponding cell.
  • the terminal When the terminal is turned on the next time or enters the signal coverage area from the signal blind area, when it needs to search the network corresponding to the first PLMN identifier, the first PLMN identifier is found from the PLMN set corresponding to the first RAT, and it is determined that the first RAT corresponds to The storage duration of the first PLMN identity in the PLMN set.
  • the cell corresponding to the first PLMN identity will be searched first in the frequency band supported by the first RAT; if the storage duration is greater than the first preset duration, If the duration is set, the first PLMN identity is deleted from the PLMN set corresponding to the first RAT, and the cell corresponding to the first PLMN identity is preferentially searched on the frequency band supported by the second RAT.
  • the implementation manner of preferentially searching for the cell corresponding to the first PLMN identity on the frequency band supported by the second RAT may be: searching for the first PLMN identity from the PLMN set corresponding to the second RAT, and if the first PLMN identity is found, then Determine the storage duration of the first PLMN identity in the PLMN set corresponding to the second RAT.
  • the storage duration is not greater than the first preset duration, preferentially search for the cell corresponding to the first PLMN identity on the frequency band supported by the second RAT; if stored If the duration is greater than the first preset duration, the first PLMN identity will be deleted from the PLMN set corresponding to the second RAT, and the cell corresponding to the first PLMN identity will be searched first in the frequency band supported by the third RAT, where the standard of the third RAT The system is lower than the second RAT.
  • the specific implementation of preferentially searching for the cell corresponding to the first PLMN identity on the frequency band supported by the third RAT can be found in the relevant description of preferentially searching for the cell corresponding to the first PLMN identity on the frequency band supported by the second RAT. Go into details again.
  • the terminal By deleting the first PLMN identity in the PLMN set corresponding to a certain RAT (for example, the first RAT or the second RAT), it can be avoided that the terminal has successfully camped on the location area of the network corresponding to the first PLMN identity in a short time. Stay, the next time you turn on or enter the signal coverage area from the blind area, you will search the network for an invalid RAT at another location that does not support the RAT (that is, the cell corresponding to the first PLMN identifier cannot be searched on the frequency band supported by the RAT) the process of.
  • a certain RAT for example, the first RAT or the second RAT
  • FIG. 4 a schematic flowchart of another method for cell search is provided in an embodiment of this application.
  • This method may be executed by a terminal or a component of the terminal (such as a chip, a circuit, etc.).
  • the following takes the terminal to execute the method as an example for description.
  • the method includes the following steps:
  • Step 401 After the terminal is powered on or enters the signal coverage area from the signal blind area, a cell search is started.
  • the signal blind area may be an area without network signal coverage, and the signal coverage area may be an area covered by network signals.
  • Step 402 When searching for a cell corresponding to the first PLMN identity, it is determined that the cell corresponding to the first PLMN identity has been successfully camped on the first RAT within a first preset time period.
  • step 402 the cell corresponding to the first PLMN identifier has not been successfully camped on the first RAT, which may mean that the cell corresponding to the first PLMN identifier has not been successfully camped on any frequency band supported by the first RAT.
  • step 402 may have multiple possible implementation manners.
  • specific implementation manners refer to the related description of the implementation manner of step 302, which will not be repeated here.
  • Step 403 Search for the cell corresponding to the first PLMN identity on the first RAT first.
  • the cell search is initiated.
  • the terminal determines that the terminal succeeds in the first RAT within the first preset time period. Have camped on the cell corresponding to the first PLMN identity.
  • the terminal preferentially searches for the cell corresponding to the first PLMN identity on the first RAT, and can quickly obtain the communication services provided by the cell corresponding to the first PLMN identity , Which can improve the efficiency of web search.
  • the specific implementation manner for the terminal to preferentially search for the cell corresponding to the first PLMN identity on the first RAT is not limited.
  • the implementation manner may include, but is not limited to:
  • Method 1 Search for the cell corresponding to the first PLMN identity on the frequency band supported by the first RAT. If the cell corresponding to the first PLMN identity is searched on the frequency band supported by the first RAT, initiate network registration to the cell corresponding to the first PLMN identity process. Among them, the network registration process here can refer to the relevant content of the aforementioned network registration, which will not be repeated here. If the cell corresponding to the first PLMN identification is not found in the frequency band supported by the first RAT, continue to search for the cell corresponding to the first PLMN identification in the frequency band supported by the RAT with a lower standard than the first RAT.
  • the network registration process can refer to the relevant content of the aforementioned network registration, which will not be repeated here.
  • the first RAT may be 5G
  • the second RAT may be any of 4G, 3G, and 2G.
  • the first RAT may be 4G
  • the second RAT may be 3G or 2G.
  • the first RAT may be 3G
  • the second RAT may be 2G.
  • Manner 2 Only search for the cell corresponding to the first PLMN identity on the frequency band supported by the first RAT.
  • the terminal After the above step 403, if the terminal searches for the cell corresponding to the first PLMN identity on the first RAT, it will camp on the cell corresponding to the first PLMN identity. The next time the terminal is powered on or enters the signal coverage area from the signal blind zone, the cell search is started. When searching for the cell corresponding to the first PLMN identity, the terminal can also determine that the current location of the terminal corresponds to the last time the first PLMN identity is corresponding Whether the search position of the cell of the cell is changed to determine whether to preferentially search for the cell corresponding to the first PLMN identity on the first RAT.
  • preferentially searching for the cell corresponding to the first PLMN identity on the first RAT specifically includes: when the distance between the first position and the second position of the terminal is less than a preset distance threshold, preferentially Search for the cell corresponding to the first PLMN identification on the first RAT; where the first location is the current location of the terminal, and the second location is the identification of the first PLMN after the terminal was last powered on or entered the signal coverage area from the blind zone. The location of the corresponding cell when searching. Since the distance between the two searched locations is less than the preset distance threshold, it indicates that the terminal has a small moving distance.
  • the terminal will preferentially search for the cell corresponding to the first PLMN identifier on the first RAT, that is, it can also be in the second location Searching for the cell corresponding to the first PLMN identifier on the first RAT helps to quickly obtain the communication service provided by the cell corresponding to the first PLMN identifier, thereby improving the efficiency of network search.
  • the cell search is initiated.
  • searching for the cell corresponding to the first PLMN identity it is determined that the cell corresponding to the first PLMN identity has been successfully camped on the first RAT within the first preset time period.
  • the distance between the first position and the second position of the terminal is greater than or equal to the preset distance threshold, the cell corresponding to the first PLMN identity is preferentially searched on the second RAT.
  • the distance between the two searched locations is greater than or equal to the preset distance threshold, indicating that the terminal has moved a long distance.
  • the terminal if the cell corresponding to the first PLMN identity is searched for on the first RAT, the terminal cannot be searched.
  • the cell corresponding to the first PLMN identity that provides communication services is equivalent to searching for the cell corresponding to the first PLMN identity on an invalid RAT. Therefore, in this case, the terminal preferentially searches for the first PLMN identity corresponding to the first PLMN on the second RAT the cell search procedure is skipped corresponding to a first PLMN identifier of a cell in a first invalid-RAT, contributes to a faster communication service is acquired, so that the network can enhance search efficiency.
  • FIG. 5 it is a schematic flowchart of another cell search method provided in an embodiment of this application. The method includes the following steps:
  • Step 501 After the terminal is powered on or enters the signal coverage area from the signal blind area, it starts a cell search, and when searching for the cell corresponding to the first PLMN identifier, it reads the registration information of the 5G SA network.
  • the registration information of the 5G SA network includes the PLMN identifiers corresponding to the cells covering the 5G SA network that have been successfully registered on the frequency bands supported by the 5G SA before starting this time or entering the signal coverage area from the signal blind zone.
  • Step 502 The terminal determines whether the registration information of the 5G SA network includes the first PLMN identity; if so, execute step 503; if not, execute step 504.
  • Step 503 The terminal searches for a cell covering the SA network corresponding to the first PLMN identifier on the frequency band supported by the 5G SA.
  • Step 504 Skip the process of searching for a cell covering the SA network corresponding to the first PLMN identity on the frequency band supported by 5G SA, and the terminal searches for the cell corresponding to the first PLMN identity on the frequency band supported by other RATs.
  • the other RAT may be any of 4G, 3G, and 2G.
  • Step 505 The terminal searches for a cell covering the 5G SA network through other methods.
  • Step 506 whether the terminal successfully camps on a cell covering the 5G SA network, if yes, execute step 507; if not, execute step 505.
  • Step 507 The terminal adds the first PLMN identifier to the registration information of the 5G SA network.
  • Step 508 When the terminal searches for the cell corresponding to the first PLMN identifier after it is powered on the next time or enters the signal coverage area from the signal blind area, the process of steps 501 to 507 is repeated.
  • an embodiment of the present application also provides a communication device.
  • the communication device 600 includes a starting unit 601, a determining unit 602, and a searching unit 603.
  • the processing unit 604 may also be included, and the communication device 600 (hereinafter referred to as the device 600) may be used to implement the method executed in the foregoing embodiment.
  • the apparatus 600 may be a terminal, or may be located in the terminal.
  • the above-mentioned apparatus 600 may be a terminal, or a chip applied in the terminal or other combination devices or components having the above-mentioned terminal function.
  • the activation unit 601, the determination unit 602, the search unit 603, and the processing unit 604 may be processors.
  • the terminal may also include a transceiver unit, which may be a transceiver, may include an antenna and a radio frequency circuit, etc., for example: central Processing unit (central processing unit, CPU).
  • CPU central processing unit
  • the transceiver unit may be a radio frequency unit
  • the processing unit may be a processor.
  • the transceiver unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system.
  • the apparatus 600 may be used to execute the steps performed by the terminal in the foregoing method embodiment.
  • the starting unit 601 is used to start a cell search after powering on or entering the signal coverage area from the signal blind zone; the determining unit 602 is used to perform cell search on the cell corresponding to the PLMN identity of the first public land mobile network. During the search, it is determined that the cell corresponding to the first PLMN identity has not been successfully camped on the first RAT within the first preset time period; the searching unit 603 is configured to preferentially search for the cell corresponding to the first PLMN identity on the second RAT, where , The standard of the second RAT is lower than the standard of the first RAT.
  • the communication device further includes a processing unit 604, configured to: when the first cell is searched for on the second RAT, camp on the first cell, where the first cell supports the second RAT and corresponds to The cell identified by the first PLMN.
  • the processing unit 604 is further configured to: when any of the following conditions is met, switch from the first cell or reselect to the second cell, where the second cell supports the first RAT and corresponds to the first RAT.
  • a cell identified by a PLMN, and the second cell is the cell with the best signal quality among the neighboring cells of the first cell;
  • Condition 1 After starting intra-frequency measurement, the signal quality of the second cell is greater than the signal quality of the first cell within a second preset time period;
  • Condition 2 After the inter-frequency or inter-system measurement is started, the signal quality of the second cell is greater than the signal quality of the first cell within the second preset time period, and the frequency point corresponding to the second cell takes precedence The level is equal to the frequency priority of the first cell;
  • Condition 3 After starting the inter-frequency or inter-system measurement, the signal quality of the second cell within the second preset time period is greater than the first preset threshold, and the frequency point priority corresponding to the second cell Higher than the frequency priority of the first cell;
  • Condition 4 After the inter-frequency or inter-system measurement is started, the signal quality of the first cell within the second preset time period is less than a second preset threshold, and the signal quality of the second cell is greater than the third A threshold is preset, and the frequency priority corresponding to the second cell is lower than the frequency priority of the first cell.
  • the searching unit 603 is further configured to search for the cell corresponding to the first PLMN identifier after the next power-on or enter the signal coverage area from the signal blind area, and search for the first PLMN on the first RAT first. Identify the corresponding cell.
  • the searching unit 603 is specifically configured to: when the distance between the first position and the second position of the communication device is less than a preset distance threshold, preferentially search for the first PLMN identifier corresponding to the first RAT Cell; where the first location is the location where the communication device is currently located, and the second location is the location where the cell corresponding to the first PLMN identifier was searched after the communication device was last powered on or entered the signal coverage area from the signal blind zone last time.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • the starting unit 601 is used to start a cell search after powering on or entering the signal coverage area from the signal blind area;
  • the determining unit 602 is used to identify the cell corresponding to the first public land mobile network PLMN When searching, it is determined that the cell corresponding to the first PLMN identity has been successfully camped on the first RAT within the first preset time period;
  • the searching unit 603 is configured to preferentially search for the cell corresponding to the first PLMN identity on the first RAT.
  • the searching unit 603 is specifically configured to: when the distance between the first position and the second position of the communication device is less than a preset distance threshold, preferentially search for the first PLMN identifier corresponding to the first RAT Cell; where the first location is the location where the communication device is currently located, and the second location is the location where the cell corresponding to the first PLMN identifier was searched after the communication device was last powered on or entered the signal coverage area from the signal blind zone last time.
  • the first RAT is the fifth-generation 5G wireless access technology
  • the second RAT is the fourth-generation 4G wireless access technology, the third-generation 3G wireless access technology, and the second-generation 2G wireless access technology. Any one of them.
  • each functional unit in each embodiment of this application may be Integrated in one processing unit, it can also be a separate physical presence, or two or more units can be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit 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 the present application essentially or the part that contributes to the existing technology or all or 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 to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps in the method embodiments 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 .
  • an embodiment of the present application also provides a communication device 700.
  • the communication device 700 (hereinafter referred to as the device 700) can be used to implement the method executed in the foregoing method embodiment.
  • the device 700 may be a terminal device or may be located in a terminal device.
  • the apparatus 700 includes one or more processors 701.
  • the processor 701 may be a general-purpose processor or a special-purpose processor or the like. For example, it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, terminals, or chips), execute software programs, and process data in the software programs.
  • the communication device 700 may include a transceiving unit to implement signal input (reception) and output (transmission).
  • the transceiver unit may be a transceiver, a radio frequency chip, and so on.
  • the apparatus 700 includes one or more processors 701, and the one or more processors 701 can implement the methods executed in the above-described embodiments.
  • the processor 701 may implement other functions in addition to the method in the above-mentioned embodiment.
  • the processor 701 may execute instructions to make the apparatus 700 execute the method executed in the foregoing method embodiment.
  • the instruction can be stored in whole or in part in the processor 701, such as the instruction 703, or stored in the memory 702 coupled to the processor 701 in whole or in part, such as the instruction 704, or the device 700 can be executed by the instructions 703 and 704 together. The method performed in the above method embodiment.
  • the communication device 700 may also include a circuit, which may implement the functions performed by the terminal device in the foregoing method embodiment.
  • the apparatus 700 may include one or more memories 702, on which instructions 704 are stored, and the instructions may be executed on a processor, so that the apparatus 700 executes the cell described in the above method embodiments. Search method.
  • data may also be stored in the memory.
  • instructions and/or data may also be stored in the processor.
  • the foregoing one or more memories 702 may store the association or correspondence described in the foregoing embodiment, or related parameters or tables involved in the foregoing embodiment.
  • the processor and the memory may be separately provided, or may be integrated or coupled together.
  • the apparatus 700 may further include a transceiver unit 705.
  • the processor 701 may be referred to as a processing unit, and controls a device (terminal or base station).
  • the transceiving unit 705 may be referred to as a transceiver, a transceiving circuit, or a transceiver, etc., for implementing the transceiving of the device.
  • the apparatus 700 may include a transceiver unit 705.
  • the device 700 may further include a transceiver unit 705 and an antenna 706.
  • the processor 701 may be referred to as a processing unit, which controls the device.
  • the transceiving unit 705 may be called a transceiver, a transceiving circuit, or a transceiver, etc., and is used to implement the transceiving function of the device through the antenna 706.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments may be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • Programming logic devices discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present 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.
  • the steps of the method disclosed in the embodiments of the present 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 memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM
  • the embodiments of the present application also provide a computer-readable storage medium that stores a computer program.
  • the computer program When executed by a computer, the computer can implement any of the above-mentioned method embodiments applied to the terminal.
  • the method of cell search The method of cell search.
  • the embodiments of the present application also provide a computer program product, the computer program product is used to store a computer program, when the computer program is executed by a computer, the computer can implement the cell search function of any of the above-mentioned method embodiments applied to the terminal method.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • 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 through a wired (for example, coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium can be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)) )Wait.
  • a magnetic medium for example, a floppy disk, a hard disk, and a magnetic tape
  • an optical medium for example, a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD solid state disk
  • the embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the method of any of the above-mentioned method embodiments applied to the terminal device.
  • the foregoing processing device may be a chip, and the processor may be implemented by hardware or software.
  • the processor When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor It may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated in the processor, or may be located outside the processor and exist independently.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

一种小区搜索的方法、装置及系统，其中方法包括：终端开机或从信号盲区进入信号覆盖区后，启动小区搜索，在终端对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定终端在预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区，在这种情况下，终端优先在制式较低的第二RAT上搜索第一PLMN标识对应的小区，跳过在无效的第一RAT上搜索第一PLMN标识对应的小区的搜索过程，可以更快的获取到通信服务，从而可以提升网络搜索效率，降低时延。

Description

小区搜索的方法、装置及系统 技术领域
本申请涉及通信领域，尤其涉及一种小区搜索的方法、装置及系统。
背景技术
在终端开机或者从信号盲区进入信号覆盖区时需要搜索网络，以便接入公共陆地移动网络(public land mobile network，PLMN)，从而获取通信服务。目前，一种终端搜索网络时可能采用的模式为：首先进行网络选择，选择一个PLMN，然后根据无线接入技术(radio access technology，RAT)对应的搜索优先级顺序，搜索优先级由高到低的顺序为第五代(5th-Generation，5G)无线接入技术、第四代(4th-generation，4G)无线接入技术、第三代(3rd-Generation，3G)无线接入技术、第二代(second generation，2G)无线接入技术，依次使用所有终端支持的RAT以及每个RAT支持的频段进行小区搜索，如果搜索到的小区所广播的PLMN与选择的PLMN匹配，就认为网络选择成功。然后，终端驻留在所选择的网络中。
目前，各运营商在不同地区网络架构部署情况不同，例如，很多地区还没有部署5G独立组网(stand alone，SA)网络架构，有些偏远山区没有部署4G网络架构等，如果终端设备在每次开机或从信号盲区进入信号覆盖区时都按照目前的模式搜索网络，需要很长时间才能搜索到能够为终端设备提供服务的网络，导致网络搜索效率很低。
发明内容
本申请实施例提供一种小区搜索的方法、装置及系统，用于提升网络搜索效率，降低时延。
应理解，本申请实施例提供的方案中，计算设备是指能够被抽象为计算机系统的设备。支持无线通信功能的计算设备，可称为无线通信设备。无线通信装置可以是该计算设备的整机，也可以是该计算设备中的部分器件，例如无线通信功能相关的芯片，如系统芯片或通信芯片。其中，系统芯片也称为片上系统，或称为SoC芯片。具体地，无线通信装置可以是诸如智能手机这样的终端，也可以是能够被设置在终端中的系统芯片或通信芯片。此外，无线通信装置可以是诸如基站这样的无线接入网设备，也可以是能够被设置在无线接入网设备中的相关芯片，例如SoC芯片或通信芯片。通信芯片可以包括射频处理芯片和基带处理芯片。基带处理芯片有时也称为调制解调器(modem)。在物理实现中，通信芯片可集成在SoC芯片内部，也可以不与SoC芯片集成。例如，基带处理芯片集成在SoC芯片中，射频处理芯片不与SoC芯片集成。
第一方面，本申请实施例提供一种小区搜索的方法，该方法包括：开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区，优先在第二RAT上搜索第一PLMN标识对应的小区，其中，第二RAT的制式低于第 一RAT的制式。
该方法可由通信装置执行，通信装置可以是通信设备或能够支持通信设备实现该方法所需的功能的通信装置，例如芯片。示例性地，所述通信装置为终端，或者为设置在终端中的用于实现终端的功能的芯片，或者为用于实现终端的功能的其他部件。在下文的介绍过程中，以通信装置是终端为例。
通过上述方法，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，终端确定所述终端在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区，在这种情况下如果在第一RAT上搜索第一PLMN标识对应的小区，无法搜索到可以为终端提供通信服务的第一PLMN标识对应的小区，这相当于是在无效的RAT上搜索第一PLMN标识对应的小区，因此对于这种情况，终端优先在第二RAT上搜索所述第一PLMN标识对应的小区，跳过在无效的第一RAT上搜索第一PLMN标识对应的小区的过程，可以更快的获取到通信服务，从而可以提升网络搜索效率，降低时延。
一种可能的设计中，该方法还包括：终端在第二RAT上搜索到第一小区时，驻留到第一小区，其中，第一小区为支持第二RAT且对应于第一PLMN标识的小区。
通过上述方法，终端可以在第二RAT上搜索到第一PLMN标识对应的第一小区时，驻留到该第一小区，以便获取该第一小区的通信服务。
一种可能的设计中，该方法还包括：在满足以下任一条件时，终端从第一小区切换或重选至第二小区，其中，第二小区为支持第一RAT且对应于第一PLMN标识的小区，且所述第二小区为所述第一小区的邻小区中信号质量最好的小区；其中：
条件一，在启动同频测量后，第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量；
条件二，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量，且所述第二小区对应的频点优先级等于所述第一小区的频点优先级；
条件三，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于第一预设门限值，且所述第二小区对应的频点优先级高于所述第一小区的频点优先级；
条件四，在启动异频或异系统测量后，所述第二预设时长内所述第一小区的信号质量小于第二预设门限值，且所述第二小区的信号质量大于第三预设门限值，且所述第二小区对应的频点优先级低于所述第一小区的频点优先级。
通过上述方法，终端在驻留到第一小区后，可以从第一小区切换或重选至服务质量更好的第一PLMN标识对应的第二小区，这样可以在第一RAT下的第二小区获取到更好的通信服务。
一种可能的设计中，该方法还包括：在终端下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，终端优先在第一RAT上搜索第一PLMN标识对应的小区。
通过上述方法，终端在切换或重选至第二小区，说明终端已经成功驻留过第一PLMN标识对应的小区，这样在终端下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，优先在第一RAT上搜索第一PLMN标识对应的小区，有助于快速获取到支持第一RAT的小区提供的通信服务。
一种可能的设计中，优先在第一RAT上搜索第一PLMN标识对应的小区，具体包括：在终端的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为终端当前所在的位置，第二位置为终端上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
通过上述方法，终端在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，通过比较两次搜索的位置变化，两次搜索的位置之间的距离小于预设距离阈值，说明终端移动距离较小，这种情况下终端优先在第一RAT上搜索第一PLMN标识对应的小区，在第二位置也可以搜索到第一PLMN标识对应的小区，有助于快速获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率，降低时延。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
第二方面，本申请实施例提供一种应用于终端的小区搜索的方法，该方法包括：开机或从信号盲区进入信号覆盖区后，启动小区搜索；在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定终端在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区；优先在第一RAT上搜索第一PLMN标识对应的小区。
该方法可由通信装置执行，通信装置可以是通信设备或能够支持通信设备实现该方法所需的功能的通信装置，例如芯片。示例性地，通信装置为终端，或者为设置在终端中的用于实现终端的功能的芯片，或者为用于实现终端的功能的其他部件。在下文的介绍过程中，以通信装置是终端为例。
通过上述方法，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，终端确定终端在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区，在这种情况下，终端优先在第一RAT上搜索第一PLMN标识对应的小区，可以很快的获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率，降低时延。
一种可能的设计中，优先在第一RAT上搜索第一PLMN标识对应的小区，具体包括：在终端的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为终端当前所在的位置，第二位置为终端上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
通过上述方法，终端在开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，通过比较两次搜索的位置变化，两次搜索的位置之间的距离小于预设距离阈值，说明终端移动距离较小，这种情况下终端优先在第一RAT上搜索第一PLMN标识对应的小区，在第二位置也可以搜索到第一PLMN标识对应的小区，有助于快速获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
第三方面，本申请实施例提供一种通信装置，该通信装置(以下简称装置)具有实现上述第一方面的方法实例中所执行的步骤的功能。该装置可以位于终端设备中，也可以位 于终端设备所对应的芯片。上述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模块。
在一种可能的实现中，通信装置的结构中包括启动单元、确定单元和搜索单元，这些单元可以执行上述第一方面方法示例中终端所执行的相应步骤或功能。其中，启动单元，用于开机或从信号盲区进入信号覆盖区后，启动小区搜索；确定单元，用于在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区；搜索单元，用于优先在第二RAT上搜索第一PLMN标识对应的小区，其中，第二RAT的制式低于第一RAT的制式。
一种可能的设计中，通信装置还包括处理单元，用于：在第二RAT上搜索到第一小区时，驻留到第一小区，其中，第一小区为支持第二RAT且对应于第一PLMN标识的小区。
一种可能的设计中，处理单元，还用于：在满足以下任一条件时，从所述第一小区切换或重选至第二小区，其中，第二小区为支持第一RAT且对应于第一PLMN标识的小区，且所述第二小区为所述第一小区的邻小区中信号质量最好的小区；其中：
条件一，在启动同频测量后，第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量；
条件二，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量，且所述第二小区对应的频点优先级等于所述第一小区的频点优先级；
条件三，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于第一预设门限值，且所述第二小区对应的频点优先级高于所述第一小区的频点优先级；
条件四，在启动异频或异系统测量后，所述第二预设时长内所述第一小区的信号质量小于第二预设门限值，且所述第二小区的信号质量大于第三预设门限值，且所述第二小区对应的频点优先级低于所述第一小区的频点优先级。
一种可能的设计中，搜索单元，还用于：在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，优先在第一RAT上搜索第一PLMN标识对应的小区。
一种可能的设计中，搜索单元，具体用于：在通信装置的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为通信装置当前所在的位置，第二位置为通信装置上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
在另一个可能的实现中，通信装置的结构中包括启动单元、确定单元和搜索单元，这些单元可以执行上述第一方面方法示例中终端所执行的相应步骤或功能。其中，启动单元，用于开机或从信号盲区进入信号覆盖区后，启动小区搜索；确定单元，用于在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区；搜索单元，用于优先在第一RAT上搜索第一PLMN标识对应的小区。
一种可能的设计中，搜索单元，具体用于：在通信装置的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中， 第一位置为通信装置当前所在的位置，第二位置为通信装置上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
第四方面，本申请提供的通信装置具有实现上述方法的功能，其包括用于执行第一方面或第一方面中任一种可能实现方式，或者，执行第二方面或第二方面中任一种可能实现方式所描述的步骤或功能相对应的部件(means)。步骤或功能可以通过软件实现，或硬件(如电路)实现，或者通过硬件和软件结合来实现。其中，该装置可以为终端或终端上的芯片。
在一种可能的实现中，上述装置包括一个或多个处理器和通信单元。一个或多个处理器被配置为支持通信装置执行上述方法中相应的功能。可选的，通信装置还可以包括一个或多个存储器，存储器用于与处理器耦合，其保存装置必要的程序指令和/或数据。一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置。本申请并不限定。
另一个可能的实现中，上述通信装置，包括收发器、处理器和存储器。该处理器用于控制收发器或输入/输出电路收发信号，该存储器用于存储计算机程序，该处理器用于运行该存储器中的计算机程序，使得该通信装置执行第一方面或第一方面中任一种可能实现方式中完成的方法，或者，执行第二方面或第二方面中任一种可能实现方式中完成的方法。
第五方面，提供了一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机指令，当所述计算机指令在计算机上运行时，使得所述计算机执行上述第一方面或任意一种可能的实现方式中所述的方法，或者，执行第二方面或第二方面中任一种可能实现方式中完成的方法。
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用于存储有计算机指令，当所述计算机指令在计算机上运行时，使得所述计算机执行上述第一方面或任意一种可能的实施方式中所述的方法，或者，执行第二方面或第二方面中任一种可能实现方式中所述的方法。
第七方面，提供了一种通信装置，例如芯片系统等，该装置与存储器耦合，所述通信装置在运行时调用所述存储器中存储的程序指令，使得上述第一方面或任意一种可能实现方式中的方法被执行，或者，第二方面或第二方面中任一种可能实现方式中所述的方法执行。
第八方面，提供了一种通信系统，包括：网络设备，以及如上述第三方面至第四方面任一种可能实现方式中的通信装置，示例的，网络设备可以是诸如基站这样的无线接入网设备，也可以是能够被设置在无线接入网设备中的相关芯片，例如SoC芯片或通信芯片。
附图说明
图1为本申请实施例适用的一种通信系统的架构示意图；
图2为本申请实施例提供一种网络选择流程示意图。
图3为本申请实施例提供的一种小区搜索的方法流程示意图；
图4为本申请实施例提供的另一种小区搜索的方法流程示意图；
图5为本申请实施例提供的另一种小区搜索的方法流程示意图；
图6为本申请实施例提供的一种通信装置的结构示意图；
图7为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。
本申请实施例可以应用于移动通信系统，例如全球移动通讯系统(global system for mobile communications，GSM)、通用分组无线服务(general packet radio service，GPRS)通信系统、码分多址接入(code division multiple access，CDMA)通信系统、宽带码分多址(wideband code division multiple access，WCDMA)通信系统、时分码分多址(time-division code division multiple access，TD-SCDMA)通信系统、长期演进(long term evolution，LTE)通信系统、第五代(5th Generation，5G)通信系统(比如下一代无线(next radio，NR)系统)、未来的通信系统等。示例的，如图1所示，为本申请实施例适用的一种通信系统的架构示意图。具体的，如图1所示的通信系统包括网络设备101和终端设备102。其中，图1所示的通信系统仅为一个举例说明。
网络设备101，例如包括接入网设备，例如基站(例如，接入点)，可以是接入网中在空口通过一个或多个小区与无线终端设备通信的设备，又例如接入点等。示例的，网络设备可以包括GSM通信系统或CDMA通信系统中的基站(base transceiver station，BTS)、WCDMA通信系统中的节点B(node B)、LTE通信系统中的演进型基站(evolutional node B，eNB)、NR系统中的gNB等。需要说明的是，本申请实施例对通信系统中网络设备的个数以及实现形式不作限定。
本申请实施例中，用于实现网络设备的功能的装置可以是网络设备，也可以是能够支持网络设备实现该功能的装置，例如芯片系统，该装置可以被安装在网络设备中。在本申请实施例提供的技术方案中，以用于实现网络设备的功能的装置是网络设备为例，描述本申请实施例提供的技术方案。
终端设备102，包括向用户提供语音和/或数据连通性的设备，具体的，包括向用户提供语音的设备，或包括向用户提供数据连通性的设备，或包括向用户提供语音和数据连通性的设备。例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。该终端设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音或数据，或与RAN交互语音和数据。所述终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、用户设备(user equipment，UE)等。为便于描述，在下文中终端设备以终端为例进行说明。
应理解，本申请实施例提供的方案中，计算设备是指能够被抽象为计算机系统的设备。支持无线通信功能的计算设备，可称为无线通信设备。无线通信装置可以是该计算设备的整机，也可以是该计算设备中的部分器件，例如无线通信功能相关的芯片，如系统芯片或 通信芯片。其中，系统芯片也称为片上系统，或称为SoC芯片。具体地，无线通信装置可以是诸如智能手机这样的终端设备，也可以是能够被设置在终端设备中的系统芯片或通信芯片。此外，无线通信装置可以是诸如基站这样的无线接入网设备，也可以是能够被设置在无线接入网设备中的相关芯片，例如SoC芯片或通信芯片。通信芯片可以包括射频处理芯片和基带处理芯片。基带处理芯片有时也称为调制解调器(modem)。在物理实现中，通信芯片可集成在SoC芯片内部，也可以不与SoC芯片集成。例如，基带处理芯片集成在SoC芯片中，射频处理芯片不与SoC芯片集成。
以下，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
公共陆地移动网络(public land mobile network，PLMN)为公众提供陆地移动通信业务目的而建立和经营的网络，该网络通常与公众交换电话网(PSTN)互连，形成整个地区或国家规模的通信网。PLMN标识包括移动国家码(Mobile Country Code，MCC)和移动网络码(Mobile Network Code，MNC)，以PLMN标识为46000为例，MCC为460，表示中国；MNC为00，表示移动。对于同一个运营商来说，在不同的区域可以有不同的PLMN标识，例如，中国移动的PLMN标识可以有46000、46002、46007、46008，又例如，中国联通的PLMN标识为46001、46006、46009。
本申请实施例中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A,B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
以及，除非有相反的说明，本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。
目前，终端在开机或从信号盲区进入信号覆盖区时会搜索网络，以便搜索到合适的网络为终端提供通信服务，终端先进行网络选择，在网络选择成功之后进行网络注册的过程，下面分别进行详细说明。
(1)网络选择
网络选择的目的是搜索当前PLMN标识对应的网络中存在的小区信号，并根据小区广播的信息识别小区对应的PLMN标识，如果终端预期选择的PLMN标识与小区广播的PLMN标识能够匹配，则认为网络选择成功。
图2为本申请实施例提供一种网络选择流程示意图。
步骤201，在终端开机或从信号盲区进入信号覆盖区的场景下，终端选择一个PLMN进行网络选择。
步骤202，终端选择一个RAT开始进行网络选择。
步骤203，终端选择该RAT下的一个频段(band)开始进行网络选择。
步骤204，终端选择该RAT下该频段下的某个频点开始进行网络搜索。
步骤205，终端在该RAT下该频段下的某个频点下进行小区搜索，将搜索到的小区所广播的PLMN标识与终端选择的PLMN标识进行匹配。
步骤206，终端确定是否匹配成功；若是，则执行步骤207；若否，则执行步骤208。
步骤207，网络选择成功，向该PLMN标识对应的网络发起注册过程。
步骤208，继续在该RAT下该频段中选择下一个频点进行小区搜索。
步骤209，若该RAT下该频段下的所有频点搜索完毕，都没有搜索到PLMN标识与终端选择的PLMN标识匹配的小区，则终端选择该RAT下的下一个频段进行网络搜索。
步骤210，如果该RAT下的所有频段搜索完毕，都没有搜索到PLMN标识与终端选择的PLMN标识匹配的小区，则UE选择该PLMN下的下一个RAT进行搜索。
步骤211，如果该PLMN下的所有RAT都搜索完毕，都没有搜索到PLMN标识与终端选择的PLMN标识匹配的小区，则本轮搜索网络失败，选择下一个PLMN标识进行网络选择，直至网络选择成功。其中，选择下一个PLMN标识进行网络选择的具体参见上述步骤201～步骤211。
如图2所示，在终端开机时或从出覆盖范围恢复之后，终端使用其所支持的接入技术以及每个接入技术支持的频段(band)进行网络搜索，例如RAT按照5G、4G、3G、2G依次搜索，然后选择合适的PLMN，终端在选择PLMN成功后尝试执行网络注册过程。其中，5G网络可以包括独立组网(stand alone，SA)和非独立组网(non-stand alone，NSA)。
在一个示例中，以终端选择的PLMN标识为46000为例，当终端在搜索46000对应的网络时，会优先在5G支持的频段上搜索SA网络，若在一定时间内未搜索到SA网络，则在5G支持的频段上搜索NSA网络，若一定时间内在5G支持的频段上未搜索到NSA网络，则在4G支持的频段上搜索网络，若一定时间内在4G支持的频段上未搜索到PLMN标识对应的网络，则在3G/2G支持的频段上搜索网络，若一定时间内在3G/2G支持的频段上未搜索到PLMN标识对应的网络，则说明搜索46000对应的网络失败，重新选择一个PLMN标识，继续按照5G、4G、3G、2G依次搜索重新选择的PLMN标识对应的网络，以此类推，直到搜索到与所选择的PLMN标识匹配的网络，即网络选择成功。
(2)网络注册
网络注册用于在网络上注册用户信息，并在网络中建立用户上下文，以便网络识别用户，并为用户提供不同的网络服务。
示例性的，注册用户信息的过程可以包括认证、鉴权等过程，在此过程中终端与网络设备之间的信令交互如下述步骤S1～S6：
S1，终端向网络设备发送注册请求，该注册请求用于请求注册到所选择的PLMN标识对应的网络。
S2，网络设备向终端发送身份识别请求(identity request)消息，身份识别请求消息用于请求获取终端的身份信息。
S3，终端向网络设备发送身份识别响应(identity request)消息，该身份识别响应消息包括终端的身份信息。
S4，网络设备向终端发送鉴权请求消息，鉴权请求消息中包括鉴权信息。
S5，终端向网络设备发送鉴权响应消息，鉴权响应消息包括终端根据鉴权信息，计算得到的鉴权值，以便网络设备根据鉴权值对终端的身份进行验证，并在验证成功后执行步骤S6。
S6，网络设备向终端发送注册成功的响应消息。
在一些示例中，目前的很多终端支持5G SA网络架构，但是各运营商还没有部署5G SA 网络架构的网络架构，终端可以根据收集当前的各个运营商对5G SA网络架构的支持情况，在终端内预置各个运营商的网络建设情况，例如PLMN标识与支持的RAT。这样终端在需要搜索某个PLMN标识对应的网络时，读取预置信息，如果配置的预置信息不包括某个RAT，即该需要搜索的PLMN标识对应的网络不支持某个RAT时，以RAT为5G为例，则终端跳过该5G搜索，或者，降低5G的搜索优先级。但是每个运营商在不同地区可能会采用不同的网络架构部署，终端需要针对每个PLMN收集大量的数据，并需要提前预置到终端中，而终端无法有效的收集到全球的运营商的所有的信息，只能针对性的选择个别运营商的信息在终端中进行预配置，从而造成终端进行无效RAT的搜索网络过程，导致用户获取到服务的时间延长。
在其它一些示例中，终端支持5G SA网络架构，运营商已进行5G SA网络架构的网络建设，但是支持5G SA网络架构的终端没有开户，那么即使终端搜索到5G SA网络，但无法在5G SA网络下注册成功，则终端也无法获取到5G SA网络服务，这种情况下终端即使搜索到的SA网络也是没有实际意义，这种情况下的5G SA搜索网络过程也是无效RAT搜索网络的过程，也会导致用户获取到服务的时间延长。
为解决上述各示例提到的问题，如图3所示，为本申请实施例提供一种小区搜索的方法流程示意图。该方法可以由终端或终端的部件(如芯片、电路等)执行，为便于说明，下面以终端执行该方法为例进行说明。
该方法包括以下步骤：
步骤301，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索。
示例的，信号盲区可以为无网络信号覆盖的区域，信号覆盖区可以为有网络信号覆盖的区域。
步骤302，终端在对第一PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区。
在步骤302中，在第一RAT上未成功驻留过第一PLMN标识对应的小区，可以是指在第一RAT支持的所有频段上未成功驻留过第一PLMN标识对应的小区。
本申请实施例中，不对第一预设时长的具体数值进行限定，后文不在赘述。
本申请实施例中，步骤302可以有多种可能的实现方式，包括但不限于如下两种实现方式：
作为一种实现方式，终端在本次开机或从信号盲区进入信号覆盖区前，从未在第一RAT支持的频段上成功驻留过第一PLMN标识对应的小区，可以是在第一预设时长内曾多次对第一PLMN标识对应的小区进行搜索，但均未成功驻留过第一PLMN标识对应的小区。
作为另一种实现方式，终端在本次开机或从信号盲区进入信号覆盖区前，在第一RAT支持的频段上成功驻留过第一PLMN标识对应的小区，但是，自上一次在第一RAT支持的频段上成功驻留第一PLMN标识对应的小区开始计时，至本次开机或从信号盲区进入信号覆盖区后对第一PLMN标识对应的小区进行搜索时终止，这段时长已超过第一预设时长，这种情况下，可以确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区。
本申请实施例对确定在第一预设时长内在第一RAT支持的频段上未成功驻留过第一PLMN标识对应的小区的具体实现方式不作限定。
作为示例，一种可能的实现方式可以为：终端中存储有在第一RAT支持的频段上成功驻留过第一PLMN标识对应的小区的记录信息。以终端驻留5G SA网络对应的小区为例，当终端每次在5G支持的频段上成功驻留SA网络对应的小区时，则记录在5G支持的频段上成功驻留过SA网络对应的小区、以及驻留成功的时间的记录信息，当终端下一次开机或从信号盲区进入信号覆盖区后，对SA网络对应的小区进行搜索时，判断该记录信息对应的存储时间是否超出第一预设时长，若超出第一预设时长，则删除该记录信息。
本申请实施例对记录信息的具体表示方式不作限定，比如以集合的方式记录，可以理解为在每个RAT支持的频段上成功驻留过的小区对应的所有PLMN标识组成该RAT对应的PLMN集合。以第一RAT为5G为例，终端可以在5G对应的PLMN集合中查找第一PLMN标识，若查找到第一PLMN标识，说明终端在5G支持的频段上成功驻留过第一PLMN标识对应的小区；若未查找到第一PLMN标识，说明终端在5G支持的频段上未成功驻留过第一PLMN标识对应的小区。再比如，以列表的方式记录，可以理解为将每个RAT与在该RAT支持的频段上成功注册过的小区对应的所有PLMN标识记录在列表中，比如表示为[RAT，PLMN标识]。
步骤303，终端优先在第二RAT上搜索第一PLMN标识对应的小区。其中，第二RAT的制式低于第一RAT的制式。
示例的，RAT的制式从高到低的顺序依次为：第五代5G无线接入技术、第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术。
在一个示例中，第一RAT可以为5G，第二RAT可以为4G、3G、2G中的任一项。
在另一个示例中，第一RAT可以为4G，第二RAT可以为3G或2G。
在又一个示例中，第一RAT可以为3G，第二RAT可以为2G。
本申请实施例中，对于终端优先在第二RAT上搜索第一PLMN标识对应的小区的具体实现方式不做限定，作为示例，其实现方式可以包括但不限于：
方式一，先在第二RAT支持的频段上搜索第一PLMN标识对应的小区，若第二RAT支持的频段上未搜索到第一PLMN标识对应的小区，之后，在第一RAT支持的频段上搜索第一PLMN标识对应的小区；若在第二RAT支持的频段上成功搜索到第一PLMN标识对应的小区，则驻留第一PLMN标识对应的小区，并向该搜索到的第一PLMN标识对应的小区进行网络注册流程。其中，此处的网络注册流程可以参见前述网络注册的相关内容，此处不再赘述。
方式二，只在第二RAT支持的频段上搜索第一PLMN标识对应的小区。
若第二RAT支持的频段上未搜索到第一PLMN标识对应的小区，则可以在除第一RAT和第二RAT之外的其它RAT支持的频段上搜索第一PLMN标识对应的小区，或者，可以重新选择其它PLMN标识继续搜索小区。若在第二RAT支持的频段上成功搜索到第一PLMN标识对应的小区，则驻留第一PLMN标识对应的小区，并向该搜索到的第一PLMN标识对应的小区进行网络注册流程。其中，此处的网络注册流程可以参见前述网络注册的相关内容，此处不再赘述。
上述两种方式中，若在第二RAT支持的频段上成功搜索到第一PLMN标识对应的小区，则驻留第一PLMN标识对应的小区，在成功驻留到该第一PLMN标识对应的小区后，可以记录第一PLMN标识，以便在一次开机后对第一PLMN标识对应的小区进行搜索时，可以确定已在第二RAT支持的频段上成功驻留过第一PLMN标识对应的小区，可避免在 无效的RAT上搜索第一PLMN标识对应的小区的过程，有助于可以更快的获取到通信服务，从而可以提升网络搜索效率。
本申请实施例中，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT支持的频段上未成功驻留过第一PLMN标识对应的小区，在这种情况下如果在第一RAT上搜索第一PLMN标识对应的小区，无法搜索到可以为终端提供通信服务的第一PLMN标识对应的小区，这相当于是在无效的RAT上搜索第一PLMN标识对应的小区，因此对于这种情况，终端优先在第二RAT上搜索所述第一PLMN标识对应的小区，跳过 在无效的第一RAT上搜索第一PLMN标识对应的小区的过程，可以更快的获取到通信服务，从而可以提升网络搜索效率，降低时延。
在另一些实施例中，终端优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区，例如，在第二RAT上搜索到第一PLMN标识对应的第一小区时，终端驻留到第一小区，以便获取该第一小区的通信服务。
终端在第一小区驻留之后，为保证网络服务的稳定性及更优性，终端在空闲态下，通过对第一小区和该第一小区的邻小区的信号质量进行测量，以便从邻小区中选择一个最优小区进行小区重选，或者，终端可以在连接态下，通过对第一小区和该第一小区的邻小区的信号质量进行测量，以便从邻小区中选择一个最优小区进行小区切换，为终端提供通信服务。
示例的，在终端的第一小区的信号质量满足：选择接收电平(Srxlev)小于或等于同频测量启动功率门限(SIntraSearchP)，以及选择接收信号质量(Squal)小于或等于同频测量启动质量门限(SIntraSearchQ)，启动同频测量。
在终端的第一小区的信号质量满足：选择接收电平(Srxlev)小于或等于异频异系统测量启动功率门限(SnonIntraSearchP)(SIntraSearchP)，以及选择接收信号质量(Squal)小于或等于异频异系统测量启动质量门限(SnonIntraSearchQ)，启动异频或异系统测量。
在一种可能实现方式中，在终端启动同频测量后，第二预设时长内第二小区的信号质量大于第一小区的信号质量时，终端可以从第一小区切换或重选至该第二小区，第二小区为第一小区的邻小区中信号质量最大的小区。
在另一种可能实现方式中，在终端启动异频或异系统测量后，第二预设时长内第二小区的信号质量大于第一小区的信号质量、且第二小区对应的频点优先级等于第一小区的频点优先级时，终端可以从第一小区切换或重选至该第二小区，第二小区为第一小区的邻小区中信号质量最大的小区。
在又一种可能实现方式中，在终端启动异频或异系统测量后，第二预设时长内第二小区的信号质量大于第一预设门限值、且第二小区对应的频点优先级高于第一小区的频点优先级时，终端可以从第一小区切换或重选至该第二小区，第二小区为第一小区的邻小区中信号质量最大的小区。
在又一种可能实现方式中，在终端启动异频或异系统测量后，第二小区对应的频点优先级低于第一小区的频点优先级，第二预设时长内第一小区的信号质量小于第二预设门限值、且第二小区的信号质量大于第三预设门限值时，终端可以从第一小区切换或重选至该第二小区，第二小区为第一小区的邻小区中信号质量最大的小区。
通过上述实现方式，终端可以从第一小区切换或重选至服务质量更好的第二小区，该 第二小区为支持第一RAT且对应于第一PLMN标识的小区，这样终端可以在第一RAT下的第二小区获取到更好的通信服务。
在一种可能的实现方式中，终端切换或重选至第二小区，说明终端在第一RAT上成功驻留过第一PLMN标识对应的小区，之后，终端还可以在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，终端优先在第一RAT上搜索第一PLMN标识对应的小区，如此，有助于快速获取到支持第一RAT的小区提供的通信服务。
在该实现方式中，终端切换或重选至第二小区之后，若再次开机或从信号盲区进入信号覆盖区，对第一PLMN标识对应的小区进行搜索时，终端还可以通过判断终端当前所在的位置与上一次对第一PLMN标识对应的小区进行搜索的位置是否发生变化，来确定是否优先在第一RAT上搜索第一PLMN标识对应的小区。
作为一种实现方式，在终端的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为终端当前所在的位置，第二位置为终端上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。由于两次搜索的位置之间的距离小于预设距离阈值，说明终端移动距离较小，这种情况下终端优先在第一RAT上搜索第一PLMN标识对应的小区，即在第二位置也可以搜索到第一PLMN标识对应的小区，有助于快速获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率。
在一个示例中，终端在位置A开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，在第一RAT上成功搜索到第一PLMN标识对应的小区A，并驻留过到第一PLMN标识对应的小区A，终端从位置A移动到位置B，位置B与位置A之间的距离大于预设距离阈值，终端在位置B优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区，终端可以在第二RAT上成功搜索到第一PLMN标识对应的小区B。
例如，位置A为上海市，位置B为合肥市，终端的用户从上海市到合肥市出差，在合肥市可以优先在第二RAT支持的频段上搜索所述第一PLMN标识对应的小区，终端的用户从合肥市又回到上海市，可以优先在第一RAT支持的频段上搜索所述第一PLMN标识对应的小区，这样可以避免在不支持第一RAT的位置搜索第一RAT而浪费时间，从而可以尽快搜索到可以提供网络服务的小区。
在上述实施例中，终端驻留到第二小区，第二小区广播的PLMN标识可以为第一PLMN标识，那么终端可以在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，优先在第一RAT支持的频段上搜索第一PLMN标识对应的小区。在其它一些实施例中，第二小区广播的PLMN标识也可以为第二PLMN标识，该第二PLMN标识为除第一PLMN标识之外的其它任一PLMN标识，那么在终端下一次开机或从信号盲区进入信号覆盖区后，对该第二PLMN标识对应的小区进行搜索时，优先在第一RAT支持的频段上搜索该第二PLMN标识对应的小区。
基于上述任一实施例，终端在第一RAT支持的频段上成功驻留到第一PLMN标识对应的小区，则可以生成相应的记录信息，以记录信息为PLMN集合的方式记录为例，终端可以将该第一PLMN标识记录在第一RAT对应的PLMN集合中，待终端下一次开机或从盲区进入信号覆盖区时，需要对第一PLMN标识对应的小区进行搜索时，可以先确定第一 RAT对应的PLMN集合中是否包含该第一PLMN标识，若第一RAT对应的PLMN集合中包含该第一PLMN标识，则优先在第一RAT支持的频段上搜索第一PLMN标识对应的小区；若第一RAT对应的PLMN集合中不包含该第一PLMN标识，则优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区。
考虑到终端可能某个位置在第一RAT支持的频段上成功驻留到第一PLMN标识对应的小区，并将第一PLMN标识记录在第一RAT对应的PLMN集合中，经过一段时间之后，终端移动到并不支持第一RAT的另一位置，如果在第一RAT支持的频段上搜索第一PLMN标识对应的小区，就会导致对无效的RAT的搜索过程，延长了终端在另一位置区获得网络服务的时间，为了避免出现因为终端所在位置发生变化而进行无效RAT的搜索过程，终端可以在第一RAT支持的频段上成功驻留到第一PLMN标识对应的小区时，记录成功驻留第一PLMN标识对应的小区的时间。
在终端下一次开机或从信号盲区进入信号覆盖区后，需要对第一PLMN标识对应的网络进行搜索时，从第一RAT对应的PLMN集合中查找到第一PLMN标识，并确定第一RAT对应的PLMN集合中的第一PLMN标识的存储时长，如果存储时长不大于第一预设时长，则优先在第一RAT支持的频段上搜索第一PLMN标识对应的小区；如果存储时长大于第一预设时长，则从第一RAT对应的PLMN集合中删除该第一PLMN标识，并优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区。
示例的，优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区的实现方式可以为：从第二RAT对应的PLMN集合中查找第一PLMN标识，若查找到第一PLMN标识，则确定第二RAT对应的PLMN集合中的第一PLMN标识的存储时长，如果存储时长不大于第一预设时长，则优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区；如果存储时长大于第一预设时长，则从第二RAT对应的PLMN集合中删除该第一PLMN标识，并优先在第三RAT支持的频段上搜索第一PLMN标识对应的小区，其中第三RAT的制式低于第二RAT的制式。其中，优先在第三RAT支持的频段上搜索第一PLMN标识对应的小区的具体实现方式，可以参见优先在第二RAT支持的频段上搜索第一PLMN标识对应的小区的相关描述，此处不再赘述。
通过删除某个RAT(例如，第一RAT或第二RAT)对应的PLMN集合中的第一PLMN标识的方式，可以避免因为终端短时间内在成功驻留过第一PLMN标识对应的网络的位置区停留，下一次开机或从盲区进入信号覆盖区后在另一个并不支持该RAT(即在该RAT支持的频段上搜索不到第一PLMN标识对应的小区)的位置会进行无效RAT的搜索网络的过程。
如图4所示，为本申请实施例提供另一种小区搜索的方法流程示意图。该方法可以由终端或终端的部件(如芯片、电路等)执行，为便于说明，下面以终端执行该方法为例进行说明。
该方法包括以下步骤：
步骤401，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索。
示例的，信号盲区可以为无网络信号覆盖的区域，信号覆盖区可以为有网络信号覆盖的区域。
步骤402，在对第一PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区。
在步骤402中，在第一RAT上未成功驻留过第一PLMN标识对应的小区，可以是指在第一RAT支持的任一频段上未成功驻留过第一PLMN标识对应的小区。
本申请实施例中，步骤402可以有多种可能的实现方式，具体实现方式可以参见对步骤302的实现方式的相关描述，此处不再赘述。
步骤403，优先在第一RAT上搜索第一PLMN标识对应的小区。
本申请实施例中，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，终端确定终端在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区，在这种情况下，终端优先在第一RAT上搜索第一PLMN标识对应的小区，可以很快的获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率。
本申请实施例中，对于终端优先在第一RAT上搜索第一PLMN标识对应的小区的具体实现方式不做限定，作为示例，其实现方式可以包括但不限于：
方式一，在第一RAT支持的频段上搜索第一PLMN标识对应的小区，若第一RAT支持的频段上搜索到第一PLMN标识对应的小区，则向第一PLMN标识对应的小区发起网络注册过程。其中，此处的网络注册流程可以参见前述网络注册的相关内容，此处不再赘述。若第一RAT支持的频段上未搜索到第一PLMN标识对应的小区，继续在比第一RAT的制式更低的RAT支持的频段上搜索第一PLMN标识对应的小区。例如，在第二RAT支持的频段上搜索第一PLMN标识对应的小区，其中，第二RAT的制式低于第一RAT的制式。若在第二RAT支持的频段上成功搜索到第一PLMN标识对应的小区，则驻留第一PLMN标识对应的小区，并向该搜索到的第一PLMN标识对应的小区进行网络注册流程。其中，此处的网络注册流程可以参见前述网络注册的相关内容，此处不再赘述。
例如，第一RAT可以为5G，第二RAT可以为4G、3G、2G中的任一项。再例如，第一RAT可以为4G，第二RAT可以为3G或2G。又例如，第一RAT可以为3G，第二RAT可以为2G。
方式二，只在第一RAT支持的频段上搜索第一PLMN标识对应的小区。
在上述步骤403之后，若终端在第一RAT上搜索到第一PLMN标识对应的小区，则驻留到第一PLMN标识对应的小区。终端下一次开机或从信号盲区进入信号覆盖区后，启动小区搜索，在对第一PLMN标识对应的小区进行搜索时，终端还可以通过判断终端当前所在的位置与上一次对第一PLMN标识对应的小区进行搜索的位置是否发生变化，来确定是否优先在第一RAT上搜索第一PLMN标识对应的小区。
在一种可能的实现方式中，优先在第一RAT上搜索第一PLMN标识对应的小区，具体包括：在终端的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为终端当前所在的位置，第二位置为终端上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。由于两次搜索的位置之间的距离小于预设距离阈值，说明终端移动距离较小，这种情况下终端优先在第一RAT上搜索第一PLMN标识对应的小区，即在第二位置也可以在第一RAT上搜索到第一PLMN标识对应的小区，有助于快速获取到第一PLMN标识对应的小区提供的通信服务，从而可以提升网络搜索效率。
在其它一些实施例中，终端开机或从信号盲区进入信号覆盖区后，启动小区搜索。在 对第一PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区。在终端的第一位置与第二位置之间的距离大于或等于预设距离阈值时，优先在第二RAT上搜索第一PLMN标识对应的小区。
这两次搜索的位置之间的距离大于或等于预设距离阈值，说明终端移动距离较大，这种情况下如果在第一RAT上搜索第一PLMN标识对应的小区，无法搜索到可以为终端提供通信服务的第一PLMN标识对应的小区，这相当于是在无效的RAT上搜索第一PLMN标识对应的小区，因此对于这种情况，终端优先在第二RAT上搜索所述第一PLMN标识对应的小区，跳过 在无效的第一RAT上搜索第一PLMN标识对应的小区的过程，有助于更快的获取到通信服务，从而可以提升网络搜索效率。
下面以搜索5G SA网络为例，结合具体示例对本申请实施例提供的小区搜索的方法进一步说明。
如图5所示，为本申请实施例提供另一种小区搜索的方法的流程示意图。该方法包括如下步骤：
步骤501，终端在开机或从信号盲区进入信号覆盖区后，启动小区搜索，对第一PLMN标识对应的小区进行搜索时，读取5G SA网络的注册信息。
其中，5G SA网络的注册信息包括在此次开机或从信号盲区进入信号覆盖区之前在5G SA支持的频段上成功注册过的覆盖5G SA网络的小区所对应的PLMN标识。
步骤502，终端确定5G SA网络的注册信息中是否包含第一PLMN标识；若是，则执行步骤503；若否，则执行步骤504。
步骤503，终端在5G SA支持的频段上搜索第一PLMN标识对应的覆盖SA网络的小区。
步骤504，跳过在5G SA支持的频段上搜索第一PLMN标识对应的覆盖SA网络的小区的过程，终端在其它RAT支持的频段上搜索第一PLMN标识对应的小区。
此处，其它RAT可以为4G、3G、2G中的任一种。
步骤505，终端通过其它方式搜索到覆盖5G SA网络的小区。
步骤506，终端是否成功驻留到覆盖5G SA网络的小区，若是，则执行步骤507；若否，则执行步骤505。
步骤507，终端将第一PLMN标识加入至5G SA网络的注册信息中。
步骤508，终端在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，重复执行步骤501～507的过程。
基于与上述小区搜索的方法相同的发明构思，本申请实施例还提供一种通信装置，如图6所示，通信装置600中包含启动单元601、确定单元602和搜索单元603，可选的，还可以包括处理单元604，通信装置600(以下简称装置600)可用于实现上述实施例中所执行的方法。示例性地，装置600可以为终端，也可以位于终端内。
需要说明的是，上述装置600可以是终端，也可以是应用于终端中的芯片或者其他具有上述终端功能的组合器件、部件等。当装置600是终端时，启动单元601、确定单元602、搜索单元603和处理单元604可以是处理器，终端还可以包括收发单元，可以是收发器，可以包括天线和射频电路等，例如：中央处理单元(central processing unit,CPU)。当装置 600是具有上述终端功能的部件时，收发单元可以是射频单元，处理单元可以是处理器。当装置600是芯片系统时，收发单元可以是芯片系统的输入输出接口、处理单元可以是芯片系统的处理器。
在一个实施例中，装置600可以用于执行上述方法实施例中终端所执行的步骤。
在一种可能的实施方式中，启动单元601，用于开机或从信号盲区进入信号覆盖区后，启动小区搜索；确定单元602，用于在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区；搜索单元603，用于优先在第二RAT上搜索第一PLMN标识对应的小区，其中，第二RAT的制式低于第一RAT的制式。
一种可能的设计中，通信装置还包括处理单元604，用于：在第二RAT上搜索到第一小区时，驻留到第一小区，其中，第一小区为支持第二RAT且对应于第一PLMN标识的小区。
一种可能的设计中，处理单元604，还用于：在满足以下任一条件时，从第一小区切换或重选至第二小区，其中，第二小区为支持第一RAT且对应于第一PLMN标识的小区，且所述第二小区为所述第一小区的邻小区中信号质量最好的小区；其中：
条件一，在启动同频测量后，第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量；
条件二，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量，且所述第二小区对应的频点优先级等于所述第一小区的频点优先级；
条件三，在启动异频或异系统测量后，所述第二预设时长内所述第二小区的信号质量大于第一预设门限值，且所述第二小区对应的频点优先级高于所述第一小区的频点优先级；
条件四，在启动异频或异系统测量后，所述第二预设时长内所述第一小区的信号质量小于第二预设门限值，且所述第二小区的信号质量大于第三预设门限值，且所述第二小区对应的频点优先级低于所述第一小区的频点优先级。
一种可能的设计中，搜索单元603，还用于：在下一次开机或从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时，优先在第一RAT上搜索第一PLMN标识对应的小区。
一种可能的设计中，搜索单元603，具体用于：在通信装置的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其中，第一位置为通信装置当前所在的位置，第二位置为通信装置上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
在另一种可能的实施方式中，启动单元601，用于开机或从信号盲区进入信号覆盖区后，启动小区搜索；确定单元602，用于在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上成功驻留过第一PLMN标识对应的小区；搜索单元603，用于优先在第一RAT上搜索第一PLMN标识对应的小区。
一种可能的设计中，搜索单元603，具体用于：在通信装置的第一位置与第二位置之间的距离小于预设距离阈值时，优先在第一RAT上搜索第一PLMN标识对应的小区；其 中，第一位置为通信装置当前所在的位置，第二位置为通信装置上一次开机或上一次从信号盲区进入信号覆盖区后，对第一PLMN标识对应的小区进行搜索时的位置。
一种可能的设计中，第一RAT为第五代5G无线接入技术，第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
需要说明的是，本申请实施例中对模块的划分是示意性的，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，另外，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。上述集成的单元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。
上述集成的单元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全部或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)或处理器(processor)执行本申请各个方法实施例的全部或部分步骤。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。
基于与上述小区搜索的方法相同的构思，如图7所示，本申请实施例还提供一种通信装置700。通信装置700(以下简称装置700)可用于实现上述方法实施例中所执行的方法，可以参见上述方法实施例中的说明，其中装置700可以为终端设备，或者可以位于终端设备中。
装置700包括一个或多个处理器701。处理器701可以是通用处理器或者专用处理器等。例如可以是基带处理器、或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、终端、或芯片等)进行控制，执行软件程序，处理软件程序的数据。通信装置700可以包括收发单元，用以实现信号的输入(接收)和输出(发送)。例如，收发单元可以为收发器，射频芯片等。
装置700包括一个或多个处理器701，一个或多个处理器701可实现上述所示的实施例中执行的方法。
可选的，处理器701除了可以实现上述所示的实施例中的方法，还可以实现其他功能。
可选的，一种设计中，处理器701可以执行指令，使得装置700执行上述方法实施例中所执行的方法。该指令可以全部或部分存储在处理器701内，如指令703，也可以全部或部分存储在与处理器701耦合的存储器702中，如指令704，也可以通过指令703和704共同使得装置700执行上述方法实施例中所执行的方法。
在又一种可能的设计中，通信装置700也可以包括电路，该电路可以实现前述方法实施例中终端设备所执行的功能。
在又一种可能的设计中，装置700中可以包括一个或多个存储器702，其上存储有指令704，该指令可在处理器上被运行，使得装置700执行上述方法实施例中描述的小区搜索的方法。可选的，存储器中还可以存储有数据。可选的，处理器中也可以存储指令和/或数据。例如，上述一个或多个存储器702可以存储上述实施例中所描述的关联或对应关系，或者上述实施例中所涉及的相关的参数或表格等。其中，处理器和存储器可以单独设置，也可以集成或耦合在一起。
在又一种可能的设计中，装置700还可以包括收发单元705。处理器701可以称为处理单元，对装置(终端或者基站)进行控制。收发单元705可以称为收发机、收发电路、或者收发器等，用于实现装置的收发。
例如，如果装置700为应用于终端设备中的芯片或者其他具有上述终端功能的组合器件、部件等，装置700中可以包括收发单元705。
在又一种可能的设计中，装置700还可以包括收发单元705以及天线706。处理器701可以称为处理单元，对装置进行控制。收发单元705可以称为收发机、收发电路、或者收发器等，用于通过天线706实现装置的收发功能。
应注意，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、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实施例中公开的各方法、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。结合本申请实施例公开的方法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。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，该计算机程序被计算机执行时，所述计算机可以实现上述应用于终端的任一方法实施例的小区搜索的方法。
本申请实施例还提供一种计算机程序产品，所述计算机程序产品用于存储计算机程序，该计算机程序被计算机执行时，所述计算机可以实现上述应用于终端的任一方法实施例的小区搜索的方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合实现。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。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计算机指令时，全部或部分地产生按照本 申请实施例的流程或功能。该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。该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个计算机可读存储介质传输，例如，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(digital subscriber line，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。计算机可读存储介质可以是计算机能够存取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。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本申请实施例还提供一种处理装置，包括处理器和接口；处理器，用于执行上述应用于终端设备的任一方法实施例的方法。
应理解，上述处理装置可以是一个芯片，处理器可以通过硬件实现也可以通过软件实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码实现，该存储器可以集成在处理器中，也可以位于处理器之外，独立存在。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的保护范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (18)

  1. 一种应用于终端的小区搜索的方法，其特征在于，包括：
    开机或从信号盲区进入信号覆盖区后，启动小区搜索；
    在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定所述终端在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区；
    优先在第二RAT上搜索所述第一PLMN标识对应的小区，其中，所述第二RAT的制式低于所述第一RAT的制式。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    在所述第二RAT上搜索到第一小区时，驻留到第一小区，其中，所述第一小区为支持所述第二RAT且对应于所述第一PLMN标识的小区。
  3. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    在启动测量后，第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质量时，从所述第一小区切换或重选至第二小区，其中，所述第二小区为支持所述第一RAT且对应于所述第一PLMN标识的小区，且所述第二小区为所述第一小区的邻小区中信号质量最好的小区。
  4. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    在下一次开机或从信号盲区进入信号覆盖区后，对所述第一PLMN标识对应的小区进行搜索时，优先在所述第一RAT上搜索所述第一PLMN标识对应的小区。
  5. 如权利要求4所述的方法，其特征在于，所述优先在所述第一RAT上搜索第一PLMN标识对应的小区，具体包括：
    在终端的第一位置与第二位置之间的距离小于预设距离阈值时，优先在所述第一RAT上搜索所述第一PLMN标识对应的小区；其中，所述第一位置为所述终端当前所在的位置，所述第二位置为所述终端上一次开机或上一次从信号盲区进入信号覆盖区后，对所述第一PLMN标识对应的小区进行搜索时的位置。
  6. 如权利要求1-5任一项所述的方法，其特征在于，所述第一RAT为第五代5G无线接入技术，所述第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
  7. 一种通信装置，其特征在于，包括：
    启动单元，用于开机或从信号盲区进入信号覆盖区后，启动小区搜索；
    确定单元，用于在对第一公共陆地移动网络PLMN标识对应的小区进行搜索时，确定在第一预设时长内在第一RAT上未成功驻留过第一PLMN标识对应的小区；
    搜索单元，用于优先在第二RAT上搜索所述第一PLMN标识对应的小区，其中，所述第二RAT的制式低于所述第一RAT的制式。
  8. 如权利要求7所述的通信装置，其特征在于，所述通信装置还包括处理单元，用于：
    在所述第二RAT上搜索到第一小区时，驻留到第一小区，其中，所述第一小区为支持所述第二RAT且对应于所述第一PLMN标识的小区。
  9. 如权利要求8所述的通信装置，其特征在于，所述处理单元，还用于：
    在启动测量后，第二预设时长内所述第二小区的信号质量大于所述第一小区的信号质 量时，从所述第一小区切换或重选至第二小区，其中，所述第二小区为支持所述第一RAT且对应于所述第一PLMN标识的小区，且所述第二小区为所述第一小区的邻小区中信号质量最好的小区。
  10. 如权利要求9所述的通信装置，其特征在于，所述搜索单元，还用于：
    在下一次开机或从信号盲区进入信号覆盖区后，对所述第一PLMN标识对应的小区进行搜索时，优先在所述第一RAT上搜索所述第一PLMN标识对应的小区。
  11. 如权利要求10所述的通信装置，其特征在于，所述搜索单元，具体用于：
    在所述通信装置的第一位置与第二位置之间的距离小于预设距离阈值时，优先在所述第一RAT上搜索所述第一PLMN标识对应的小区；其中，所述第一位置为所述通信装置当前所在的位置，所述第二位置为所述通信装置上一次开机或上一次从信号盲区进入信号覆盖区后，对所述第一PLMN标识对应的小区进行搜索时的位置。
  12. 如权利要求7-11任一项所述的通信装置，其特征在于，所述第一RAT为第五代5G无线接入技术，所述第二RAT为第四代4G无线接入技术、第三代3G无线接入技术、第二代2G无线接入技术中的任一项。
  13. 一种通信装置，其特征在于，所述通信装置包括处理器和存储器，
    所述存储器，用于存储计算机程序或指令；
    所述处理器，用于执行存储器中的计算机程序或指令，使得权利要求1-6中任一项所述的方法被执行。
  14. 一种通信装置，其特征在于，所述装置包括处理器和通信接口，
    所述通信接口，用于输入和/或输出信息；
    所述处理器，用于执行计算机程序或指令，使得权利要求1-6中任一项所述的方法被执行。
  15. 一种芯片系统，其特征在于，所述芯片系统与存储器耦合，所述芯片系统在运行时调用所述存储器中存储的程序指令，使得权利要求1至6任一项所述的方法被执行。
  16. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令在被计算机调用时，使所述计算机执行如权利要求1至6任一项所述的方法。
  17. 一种计算机程序产品，其特征在于，所述计算机程序产品存储有计算机程序，所述计算机程序包括程序指令，所述程序指令当被计算机执行时，使所述计算机执行如权利要求1至6中任一项所述的方法。
  18. 一种通信系统，其特征在于，包括：网络设备，以及如权利要求7至14任一所述的通信装置。
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