CN110601788B

CN110601788B - Cell search method and device, storage medium and terminal

Info

Publication number: CN110601788B
Application number: CN201910850831.0A
Authority: CN
Inventors: 张敏; 王星
Original assignee: Spreadtrum Semiconductor Chengdu Co Ltd
Current assignee: Spreadtrum Semiconductor Chengdu Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2022-02-08
Anticipated expiration: 2039-09-09
Also published as: CN110601788A

Abstract

A cell search method and device, a storage medium and a terminal are provided, wherein the cell search method comprises the following steps: when the CSG member cell is successfully resided, recording key information of the CSG member cell, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity; and when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell, and trying to reside the CSG member cell. The technical scheme provided by the invention can be rapidly resided in the CSG member cell so as to avoid the waste of storage space and measurement resources as much as possible.

Description

Cell search method and device, storage medium and terminal

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a cell search method and apparatus, a storage medium, and a terminal.

Background

A Long Term Evolution (LTE) terminal supporting a Closed Subscriber Group (CSG) function generally preferentially resides in a suitable CSG member cell included in a CSG white list when the CSG white list is provided by a Non Access Stratum (NAS), so as to enjoy a specific service provided by the CSG member cell to the terminal.

If the terminal has the CSG white list provided by the NAS, but currently resides in a non-CSG cell, a CSG autonomous search function (CSG autonomous search function) should be used to search for a CSG member cell visited before on a non-service frequency, so as to achieve the purpose of reselecting the CSG member cell as soon as possible.

In the prior art, how to rapidly reside in the CSG member cell is still under further study.

Disclosure of Invention

The invention solves the technical problem of how to rapidly reside in the CSG member cell so as to avoid the waste of storage space and measurement resources as much as possible.

To solve the foregoing technical problem, an embodiment of the present invention provides a cell search method, including: when the CSG member cell is successfully resided, recording key information of the CSG member cell, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity; and when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell, and trying to reside the CSG member cell.

Optionally, the recording the key information of the CSG member cell includes: detecting whether the key information of the CSG member cell is recorded; and if the key information is not recorded and the total number of the recorded key information of other CSG member cells does not reach the maximum allowable recorded number, recording the key information of the CSG member cell.

Optionally, the recording the key information of the CSG member cell further includes: and if the key information of the CSG member cell is not recorded and the total number of the recorded key information of other CSG member cells reaches the maximum allowable recording number, removing the key information of the CSG member cell recorded firstly based on a first-in first-out mode and recording the key information of the CSG member cell.

Optionally, the maximum allowable number of records is 16.

Optionally, the critical information is stored in a non-volatile memory.

Optionally, when the CSG autonomous search function is used, the searching according to the recorded key information of the CSG member cell includes: and when the CSG member cell resides in a non-CSG cell and needs to be searched and attempted to reside by the CSG autonomous search function, searching according to the recorded key information of the CSG member cell.

Optionally, when the CSG autonomous search function is used, for the recorded key information of each CSG member cell, if a cell frequency in the key information is an inter-frequency measurement frequency, and a PLMN and a CSG cell identifier in the key information are included in a CSG white list, adding the cell frequency to a physical layer inter-frequency measurement frequency list.

Optionally, the adding the cell frequency to the physical layer inter-frequency measurement frequency list includes: setting the measurement type of the cell frequency to the high priority measurement if the measurement type of the cell frequency is not the high priority measurement.

Optionally, the physical layer inter-frequency measurement frequency list is an inter-frequency list in SIB 5.

To solve the foregoing technical problem, an embodiment of the present invention further provides a cell search apparatus, including: a recording module, configured to record key information of a CSG member cell when the CSG member cell successfully resides, where the key information includes one or more of the following: cell frequency, physical cell identity, PLMN, CSG cell identity; and the searching module is used for searching according to the recorded key information of the CSG member cell and trying to reside the CSG member cell when the CSG autonomous searching function is used.

To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions, where the computer instructions execute the steps of the above method when executed.

In order to solve the foregoing technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the foregoing method.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a cell search method, which comprises the following steps: when the CSG member cell is successfully resided, recording key information of the CSG member cell, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity; and when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell, and trying to reside the CSG member cell. When the terminal successfully resides in the CSG member cell, the embodiment of the invention records one or more items of key information in the cell frequency, the physical cell identifier, the PLMN and the CSG cell identifier, so that when the terminal uses the autonomous search function, the terminal can reasonably arrange the measurement resource through the recorded key information of the CSG member cell, thereby more quickly residing in the proper CSG member cell and further avoiding the waste of storage space and measurement resource to the maximum extent.

Further, still include: for the recorded key information of each CSG member cell, if the cell frequency in the key information is the pilot frequency measurement frequency and the PLMN and CSG cell identification in the key information is contained in a CSG white list, adding the cell frequency to a physical layer pilot frequency measurement frequency list. When the pilot frequency measurement frequency is determined to be the cell frequency in the key information and the PLMN and CSG cell identifiers corresponding to the pilot frequency measurement frequency are included in the CSG white list, the embodiment of the present invention may add the pilot frequency measurement frequency to the physical layer pilot frequency measurement frequency list, and further provide a feasible technical solution for quickly searching the CSG member cell for a terminal within the coverage range of the CSG member cell visited before.

Drawings

Fig. 1 is a flowchart illustrating a cell search method according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a physical layer inter-frequency measurement frequency processing according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a physical layer inter-frequency measurement frequency processing according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a cell search apparatus according to an embodiment of the present invention.

Detailed Description

As background, fast camping to a CSG member cell remains to be further investigated.

According to the third Generation Partnership Project (3 GPP) protocol TS36.304, when there is a CSG white list provided by the NAS, a terminal residing in a non-CSG normal cell should search for a previously visited CSG member cell on a non-service frequency using a CSG autonomous search function. If a CSG member cell is searched and is the highest ranked (rank) cell on the frequency, the UE may directly reselect to the CSG member cell regardless of the frequency priority. The above CSG cell search and reselection procedure should be completed within 6 minutes as described in 3GPP protocol TS 36.133.

In the performance requirements specified in 3GPP TS36.304-f20 protocol and 3GPP protocol TS36.133, when the CSG white list of the UE includes at least one CSG Identity (ID) with an associated Public Land Mobile Network (PLMN) identity, the terminal should detect at least previously visited CSG member cells, including frequencies between Radio Access Technologies (RATs), on non-serving frequencies using a CSG autonomous search function in addition to conventional cell reselection. The terminal may also use autonomous searching on the serving frequency. If the CSG white list of the terminal is empty, the terminal should disable the autonomous search function of the CSG cell.

If the terminal detects one or more suitable CSG cells on the non-service frequency, when the relevant CSG cell is the highest-ranking cell, the terminal can reselect the highest-ranking CSG cell without considering the frequency priority of the currently resident cell. If the terminal detects a suitable CSG cell on the same frequency, the terminal may reselect the cell according to a conventional reselection rule, and further details of the prior art may be referred to as the 3GPP TS36.304-f20 protocol and the 3GPP TS36.133-e40 protocol, which are not described herein again.

The inventor of the present application has found through research that the prior art has the following disadvantages: the existing protocol only specifies the purpose and time limit of the CSG autonomous search function, but no description is made on the specific implementation details, which brings uncertain factors to the implementation of each terminal manufacturer. In the process of searching the CSG member cell by using the CSG autonomous search function, the more complicated processes such as the recording of the CSG member cell, the arrangement of the measurement resource, the change of the reselection strategy and the like are involved. If the implementation of the terminal is not reasonable, the following problems may occur to the terminal: (1) the terminal cannot preferentially reside in a suitable CSG member cell, or the residence time does not meet the 6-minute requirement of the protocol; (2) wasting the terminal storage space; (3) the terminal measurement resources are wasted, which leads to the increase of the terminal power consumption and the reduction of the performance.

To solve the foregoing technical problem, an embodiment of the present invention provides a cell search method, including: when the CSG member cell is resided successfully, recording key information of the CSG member cell, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity; and when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell, and trying to reside the CSG member cell.

When the terminal successfully resides in the CSG member cell, the embodiment of the invention records one or more items of key information in the cell frequency, the physical cell identifier, the PLMN and the CSG cell identifier, so that when the terminal uses the CSG autonomous search function, the terminal can reasonably arrange the measurement resources through the recorded CSG member cell, thereby more quickly residing in the proper CSG member cell and further avoiding the waste of storage space and measurement resources to the maximum extent.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

A Closed Subscriber Group (CSG) in this context is an operator-defined set of users that are allowed to access one or more cells with special access restrictions. In an implementation, the operator may provide a special Universal Subscriber Identity Module (USIM) to the subscribers.

CSG Whitelist (CSG Whitelist) in this context, a list obtained by the NAS from the USIM, which contains CSG Identities (IDs) of all closed subscriber groups to which the subscriber belongs and associated PLMN IDs.

The CSG cell identity (CSG ID) refers to an identity broadcasted by a CSG cell or a hybrid cell, and is used to help a User Equipment (User Equipment, abbreviated as UE) to access a corresponding closed subscriber group for a User with an authority.

A CSG cell (CSG cell) herein refers to a cell that broadcasts a specific CSG ID and sets a CSG indication (indication) to true.

The hybrid cell herein refers to a cell that includes a specific CSG ID in a broadcast and sets a CSG indication to false.

A CSG member cell (CSG cell) in this document refers to a cell broadcasting a selected (selected) PLMN, a registered PLMN (registered PLMN), or an equivalent PLMN, and a record consisting of a CSG ID of the cell and an associated PLMN is included in the CSG whitelist of the UE.

A Suitable Cell (Suitable Cell) herein refers to a Cell where a UE can camp and obtain normal service, and specifically, refer to 3GPP protocol TS 25.304 or TS36.304, or TS 43.022.

Fig. 1 is a flowchart illustrating a cell search method according to an embodiment of the present invention. The cell search method may be performed by a terminal, for example, by an LTE UE or a terminal for subsequent evolved wireless communication. Specifically, the cell search method may include the steps of:

step S101, when the CSG member cell is resided successfully, the key information of the CSG member cell is recorded, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity;

and step S102, when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell, and trying to reside the CSG member cell.

More specifically, in step S101, the UE may camp in the CSG member cell. Once a UE successfully camps on any CSG member cell, the UE may store key information for the CSG member cell. The key information may include one or more of a cell frequency, a physical cell identity, a PLMN, a CSG cell identity.

In a specific implementation, when recording the key information, the UE may first check whether the UE has recorded the key information of the CSG member cell. Then, if the UE does not record the key information of the CSG member cell, and the total number of the key information of other CSG member cells that the UE has recorded does not reach the maximum allowable number of records, the UE may directly record and store the key information of the CSG member cell. Wherein the maximum allowable number of records may be 16. Those skilled in the art will appreciate that the maximum allowed number of records may vary according to actual requirements or UE storage capabilities or protocol specifications, which are not listed here.

As a variation, if the UE does not record the key information of the CSG member cell, but the total number of the key information of other CSG member cells that the UE has recorded reaches the maximum allowable number of records, the UE may remove the key information of the CSG member cell that is recorded First (recording time is earliest) based on a First In First Out (FIFO) manner, and record the key information of the CSG member cell.

As yet another variation, the UE may ignore the critical information of the CSG member cell if the UE has recorded the critical information of the CSG member cell.

It should be noted that, in order to avoid the influence caused by the shutdown or other operations of the UE, the recorded key information of the CSG member cell may be stored in a non-volatile storage (non-volatile).

In step S102, if the UE uses the CSG autonomous search function, the UE may search for and attempt to camp on the CSG member cell according to the recorded key information of the CSG member cell when the CSG member cell is searched using the CSG autonomous search function.

Specifically, when the UE resides in a non-CSG cell and needs to search for and attempt to reside in a CSG member cell visited before through the CSG autonomous search function, the UE searches according to the recorded key information of the CSG member cell. In an embodiment, the previously visited CSG member cell is a CSG member cell recorded by the UE.

In a specific implementation, if the cell frequency in the key information is an inter-frequency measurement frequency, and the PLMN and CSG cell identifier in the key information are included in a CSG white list, the UE may add the cell frequency to a physical layer inter-frequency measurement frequency list. In a specific implementation, the physical layer inter-frequency measurement frequency list may be an inter-frequency list in SIB 5.

Specifically, if the measurement type of the cell frequency is not a high priority measurement, the UE may set the measurement type of the cell frequency to the high priority measurement.

The following describes the embodiment of the present invention in detail by taking an example in which the terminal records the key information of the CSG member cell in a history information table of the CSG member cell.

First, a CSG member cell history information table is formed.

Specifically, when a terminal resides in a CSG member cell, the terminal may record key information of the CSG member cell. For example, key information of the CSG member cell is recorded in the CSG member cell history information table. The CSG member cell history information table is used for storing recorded key information. The key information may include: frequency of a cell, physical cell Identity of the cell, PLMN of the cell, and CSG cell Identity (CSG ID for short). For example, table 1 is referred to as a CSG member cell history information table herein. As shown in table 1, the 1 st piece of CSG member cell information indicates that the frequency of the CSG member cell is earfcn₁Physical cell identity is PCI₁Which belongs to PLMN₁CSG is identified as CSGID₁(ii) a The 3rd piece of CSG member cell information shows that the frequency of the CSG member cell is earfcn₃Physical cell identity is PCI₃Which also belongs to the PLMN₁CSG is identified as CSGID₃Similarly, other pieces of CSG member cell information may be represented, and are not listed here.

TABLE 1

Serial number	Key information
		1	earfcn₁,PCI₁,PLMN₁,CSGID ₁
2	earfcn₂,PCI₂,PLMN₂,CSGID ₂
		3	earfcn₃,PCI₃,PLMN₁,CSGID ₃
4	earfcn₁,PCI₄,PLMN₂,CSGID₄
		5	earfcn₂,PCI₅,PLMN₃,CSGID₅
…	…

When the key information of the CSG member cell is recorded in the CSG member cell history information table, the key information in the CSG member cell history information table may be checked before recording, and the same CSG member cell information is not repeatedly recorded. And if the key information of the CSG member cell is recorded, the recording is not repeated. Further, the number of pieces of information recorded in the CSG member cell history information table is determined according to the storage capability of the terminal, and 16 different pieces of key information can be stored according to the measurement capability required by the LTE protocol. Further, when the recorded key information amount of the CSG member cell reaches the maximum allowable recording amount, the oldest key information (the recording time is the earliest) is moved out first according to a first-in first-out principle, and then the latest key information of the CSG member cell is added.

When the terminal is powered off, the history information table of the CSG member cell may be written into the nonvolatile storage of the terminal according to a predetermined format, so that when the terminal is powered back on, the stored key information may be read from the nonvolatile storage again.

Next, frequency measurement at the time of autonomous search is performed.

Specifically, when the terminal is in a Radio Resource Control (RRC) idle state, the physical layer inter-frequency measurement frequency list configured for the physical layer is generally from an inter-frequency list in a System Information Block Type 5 (SIB 5).

When the terminal starts the CSG autonomous search function, in order to improve the probability of searching a CSG member cell that has been visited before, the pilot frequency list of the SIB5 and the information in the history information table of the CSG member cell may be combined to obtain an updated physical layer pilot frequency measurement frequency list.

Fig. 2 is a flowchart illustrating a physical layer inter-frequency measurement frequency processing according to an embodiment of the present invention. Referring to fig. 2, first, the terminal may perform operation S201 to empty the current physical layer inter-frequency measurement frequency list in order to ensure that the new physical layer inter-frequency measurement frequency list generated this time is not affected by the previous measurement configuration. Next, operation S202 is performed to fill all the information in the inter-frequency list of the SIB5 into the physical layer inter-frequency measurement frequency list. The information includes a frequency and a measurement priority type. Again, operation S203 is performed, i.e., one unprocessed record in the history information table (abbreviated as history information table in the figure) of the CSG member cells is sequentially selected.

Further, operation S204 is performed to determine whether the recorded frequency is an inter-frequency, and the PLMN and the CSGID associated therewith are included in the CSG white list. If not, operation S208 is performed; if yes, performing operation S205, that is, determining whether the frequency is included in the physical layer inter-frequency measurement frequency list, and if not, performing operation S2062; if yes, operation S2061 is executed to determine whether the measurement type of the frequency is high priority measurement in the physical layer inter-frequency measurement frequency list, and if yes, operation S208 is executed to determine whether there is any unprocessed record in the CSG member cell history information table. If there are no unprocessed records, i.e., all processing is complete, the process ends.

Further, if the following condition is not satisfied: if the recorded frequency is the pilot frequency and the PLMN and CSGID associated therewith are included in the CSG white list, operation S208 is performed to determine whether there is any unprocessed record in the CSG member cell history information table. If there are no unprocessed records, i.e., all processing is complete, the process ends. Otherwise, if the condition is satisfied: if the recorded frequency is an inter-frequency and its associated PLMN and CSGID are included in the CSG white list but the frequency is not included in the physical layer inter-frequency measurement frequency list, operation S2062 is performed, that is, the frequency is added to the physical layer inter-frequency measurement frequency list.

Further, after operation S2062, operation S207 may be performed to set a measurement type of the frequency as a high priority measurement in the physical layer inter-frequency measurement frequency list. Then, operation S208 is continuously performed to determine whether there is an unprocessed record in the CSG member cell history information table, and if the determination result is negative, the procedure is ended, otherwise, operation S203 is performed to continuously process the next unprocessed record.

It should be noted that in operation S207, the reason why the measurement priority type needs to be set as the high priority measurement is to ensure that the measurement of the frequency point is always started, and a situation that the frequency measurement is not started due to the measurement parameter configuration in the system information block type3 (systemlnformationblocktype 3, abbreviated as SIB3) does not occur. See in detail the cell reselection measurement criteria in 3GPP protocol TS36.304-f 20. Further, in operation S2062, the frequency added to the physical layer inter-frequency measurement frequency list should not participate in the evaluation of the general reselection criterion. By modifying the measurement type of the frequency to a high priority frequency in operation S207, it is necessary to determine whether to participate in the evaluation of the normal reselection criterion according to the parameters in the SIB3, through operation S2061.

Fig. 3 is a flowchart illustrating a physical layer inter-frequency measurement frequency processing according to another embodiment of the present invention. With reference to fig. 2 and fig. 3, after the terminal records the key information of the CSG member cell in the CSG member cell history information table 301, a new physical layer pilot frequency measurement frequency list 304 may be generated in combination with the CSG whitelist 302 and the pilot frequency list 303 delivered by the SIB 5.

Specifically, in the CSG member cell history information table 301, 5 pieces of CSG member cell information are recorded, each CSG member cell being represented by a frequency and other key information associated therewith. Frequency earfcn1 and its associated key information PCI1, PLMN1, CSGID1, respectively; frequency earfcn2 and its associated key information PCI 2, PLMN2, CSGID 2; frequency earfcn3 and its associated key information PCI3, PLMN1, CSGID 3; frequency earfcn1 and its associated key information PCI4, PLMN2, CSGID 4; frequency earfcn2 and its associated key information PCI5, PLMN3, CSGID 5.

The information included in the CSG whitelist 302 is PLMN1, CSGID1, respectively; PLMN2, CSGID3 and PLMN3, CSGID 5. In the pilot frequency list 303 issued by the SIB5, it is recorded that the measurement priority type of the frequency earfcn2 is a low priority; the measurement priority type of the frequency earfcn3 is equal priority; the measurement priority type of the frequency earfcn4 is low priority.

Then, the terminal may modify the measurement priority type of the frequency earfcn2 to a high priority in conjunction with the CSG member cell history information table 301, the CSG whitelist 302, and the inter-frequency list 303; the measurement priority type of earfcn1 is modified to high priority (shown in bold in the figure) and recorded in the physical layer inter-frequency measurement frequency list 304.

In summary, when the terminal performs the CSG autonomous search function, it may configure the physical layer measurement according to the physical layer pilot frequency measurement frequency list 304 generated as shown in fig. 3, and may ensure that when the terminal is in the coverage area of the CSG member cell visited before, the CSG member cell can be searched at the fastest speed. After searching the CSG member cell, the terminal can reselect and judge the CSG member cell according to the conditions specified by the protocol, and when the conditions such as relevant reselection and the like are met, the terminal can reselect the CSG member cell to enjoy the special service provided by the CSG member cell.

Fig. 4 is a schematic structural diagram of a cell search apparatus according to an embodiment of the present invention. The cell search apparatus may be configured to implement the method technical solutions shown in fig. 1 to fig. 3, and is executed by a user equipment side, for example, by a UE.

Specifically, the cell search apparatus may include: a recording module 41, configured to record key information of a CSG member cell when the CSG member cell is successfully camped, where the key information includes one or more of the following: cell frequency, physical cell identity, PLMN, CSG cell identity; and a searching module 42, configured to search according to the recorded key information of the CSG member cell when using the CSG autonomous search function, and attempt to camp on the CSG member cell.

In a specific implementation, the recording module 41 may include a detection sub-module (not shown) for detecting whether the key information of the CSG member cell has been recorded; and a recording sub-module (not shown) for recording the key information of the CSG member cell if the key information is not recorded and the total number of the recorded key information of other CSG member cells does not reach the maximum allowable number of records.

In a specific implementation, the recording module 41 may further include: a removing sub-module (not shown), if the key information of the CSG member cell is not recorded and the total number of the recorded key information of other CSG member cells reaches the maximum allowable number of records, the removing sub-module removes the key information of the CSG member cell recorded first based on a first-in first-out manner and records the key information of the CSG member cell.

In a specific implementation, the maximum allowed number of records may be 16.

In a specific implementation, the critical information is stored in non-volatile memory.

In a specific implementation, the searching module 42 may include a searching sub-module (not shown) configured to search according to the recorded key information of the CSG member cell when the CSG member cell needs to be searched and attempted to reside in a non-CSG cell and needs to be searched by the CSG autonomous searching function.

In a specific implementation, the cell search apparatus may further include: an adding module (not shown) adds the cell frequency to a physical layer inter-frequency measurement frequency list if the cell frequency in the key information is an inter-frequency measurement frequency and the PLMN and CSG cell identifier in the key information are included in a CSG white list, for the recorded key information of each CSG member cell when the CSG autonomous search function is used.

In a specific implementation, the adding module may further include a setting sub-module (not shown), and if the measurement type of the cell frequency is not the high priority measurement, the setting sub-module is configured to set the measurement type of the cell frequency as the high priority measurement.

In a specific implementation, the physical layer inter-frequency measurement frequency list may be an inter-frequency list in SIB 5.

For more contents of the working principle and working mode of the cell search apparatus, reference may be made to the related description in the embodiments shown in fig. 1 to fig. 3, and details are not repeated here.

Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the technical solutions of the methods in the embodiments shown in fig. 1 to fig. 3 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The computer readable storage medium may include ROM, RAM, magnetic or optical disks, and the like.

Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 1 to 3 when running the computer instruction. Specifically, the terminal may be an LTE UE, a 5G UE, or the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method of cell search, comprising:

when the CSG member cell is successfully resided, recording key information of the CSG member cell, wherein the key information comprises one or more of the following items: cell frequency, physical cell identity, PLMN, CSG cell identity;

when the CSG autonomous search function is used, searching according to the recorded key information of the CSG member cell and trying to reside the CSG member cell;

when a CSG autonomous search function is started, combining the pilot frequency list of SIB5 with the information of a CSG member cell history information table to obtain an updated physical layer pilot frequency measurement frequency list, and measuring a physical layer according to the updated physical layer pilot frequency measurement frequency list configuration, wherein the CSG member cell history information table is used for storing recorded key information;

combining the pilot frequency list of the SIB5 with the information of the history information table of the CSG cell member to obtain an updated physical layer pilot frequency measurement frequency list, including:

performing operation S201, clearing the current physical layer inter-frequency measurement frequency list;

performing operation S202, and filling all information in the pilot frequency list of the SIB5 into the physical layer pilot frequency measurement frequency list, where the information includes a frequency and a measurement priority type;

executing operation S203, and selecting an unprocessed record in the CSG member cell history information table in sequence;

executing operation S204, and judging whether the selected recorded frequency is pilot frequency, and the PLMN and the CSGID associated with the selected recorded frequency are included in the CSG white list;

if the determination result of operation S204 is yes, performing operation S205 to determine whether the frequency is included in the physical layer inter-frequency measurement frequency list;

if the judgment result of the operation S205 is no, performing operation S2062, and adding the frequency to the physical layer inter-frequency measurement frequency list; after operation S2062, operation S207 is performed, in which the measurement type of the frequency is set as a high priority measurement in the physical layer inter-frequency measurement frequency list;

if the determination result of operation S205 is yes, then operation S2061 is performed to determine whether the measurement type of the frequency is a high priority measurement in the physical layer inter-frequency measurement frequency list; if the determination result of operation S2061 is negative, then operation S207 is performed;

after operation S207, operation S208 is performed to determine whether there is any unprocessed record in the CSG member cell history information table;

if the determination result of operation S204 is no or the determination result of operation S2061 is yes, operation S208 is performed;

when the judgment result of the operation S208 is no, the flow is ended; when the judgment result of the operation S208 is yes, jumping to an operation S203 to continue processing a next unprocessed record;

if there are no unprocessed records, i.e., all processing is complete, the process ends.

2. The cell search method according to claim 1, wherein the recording key information of the CSG member cell comprises:

detecting whether the key information of the CSG member cell is recorded;

and if the key information is not recorded and the total number of the recorded key information of other CSG member cells does not reach the maximum allowable recorded number, recording the key information of the CSG member cell.

3. The cell search method of claim 2, wherein the recording key information of the CSG member cell further comprises:

and if the key information of the CSG member cell is not recorded and the total number of the recorded key information of other CSG member cells reaches the maximum allowable recording number, removing the key information of the CSG member cell recorded firstly based on a first-in first-out mode and recording the key information of the CSG member cell.

4. The cell search method of claim 2 or 3, wherein the maximum allowed number of records is 16.

5. The cell search method according to any of claims 1 to 3, wherein the key information is stored in a non-volatile memory.

6. The cell search method according to any one of claims 1 to 3, wherein the searching according to the recorded key information of the CSG member cell when the CSG autonomous search function is used comprises:

and when the CSG member cell resides in a non-CSG cell and needs to be searched and attempted to reside by the CSG autonomous search function, searching according to the recorded key information of the CSG member cell.

7. A cell search apparatus, comprising:

a recording module, configured to record key information of a CSG member cell when the CSG member cell successfully resides, where the key information includes one or more of the following: cell frequency, physical cell identity, PLMN, CSG cell identity;

the searching module is used for searching according to the recorded key information of the CSG member cell and trying to reside the CSG member cell when the CSG autonomous searching function is used;

8. A storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 6.

9. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 6.