CN114245437A - Method and system for improving 5G terminal service call completing rate - Google Patents
Method and system for improving 5G terminal service call completing rate Download PDFInfo
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- 230000008569 process Effects 0.000 claims description 39
- 238000004891 communication Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 description 6
- 230000006855 networking Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The invention provides a method and a system for improving the service connection rate of a 5G terminal, which comprises the following steps: selecting and searching cell information by a cell, and reading a message; judging whether the current cell meets the criterion of residing; if the current cell does not satisfy the residence, continuously reading the system information of the searched cell until the residence criterion is satisfied or all searches are completed; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion; the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside. The invention can improve the success rate of the user for initiating normal service and the user experience.
Description
Technical Field
The invention relates to the field of communication systems, in particular to a method and a system for improving the service connection rate of a 5G terminal.
Background
The Service Area Restriction (Service Area Restriction) defines in which NR regions the terminal can initiate normal traffic and in which NR regions the terminal cannot initiate normal traffic. A general network may set some special areas (e.g., military areas, operator-specific areas, etc.) as service restricted areas, allowing only specific terminals to access service. When other non-specific terminals are located in the service restricted area, they may register with the NR network but cannot initiate a service request, and can only make emergency services or respond to network paging.
According to the 3GPP-TS24.501 standard, the service Area restriction information is generally composed of Tracking Area (Tracking Area) information of allowed Area or non-allowed Area, each type containing up to 16 TAs. After the terminal accesses the NR network, the network may configure the service area restriction information to the terminal through a REGISTRATION response MESSAGE (REGISTRATION ACCEPT MESSAGE), or may notify the terminal of the service area restriction information through a CONFIGURATION UPDATE MESSAGE (CONFIGURATION UPDATE COMMAND MESSAGE). When the terminal is powered off or the card is dropped, the service area restriction information is cleared.
If the terminal is in the service area limitation area, no matter in an idle state or a connection state, the normal service flow is not allowed to be initiated. The terminal can initiate normal service only when the terminal moves out of the service restricted area or the network updates that the area is not the service restricted area.
According to the 3GPP-TS38.304 standard, when a terminal attempts to camp on an NR cell normally, the following four criteria are satisfied:
1. the candidate NR cell belongs to a specified PLMN or a registered PLMN or an equivalent PLMN thereof;
2. the candidate NR cell does not belong to a forbidden cell;
3. the TAI of a candidate NR cell does not belong to "Forbidden Tracking Areas";
4. the candidate NR cell quality satisfies the S criterion.
When the 5G terminal is in the edge area covered by multiple NR cells, there may be multiple NR cells all satisfying the above criteria. If the NR cell where the terminal selects to camp belongs to the limited service area, the terminal cannot initiate normal services in the area. And according to the 3GPP-TS23.501 standard, at this time, the terminal cannot trigger a reselection or PLMN selection process because it is in a limited service area, which will cause the terminal to be in the edge of another NR cell with unlimited service, but only wait for the limited service area of the current NR cell to update, or move away from the current limited service area, and then initiate a normal service, so that the terminal cannot initiate a normal service in this nearby area, which seriously affects the user experience.
In order to solve the above problems, a method for improving the service connection rate of the 5G terminal is provided. In the method, when the 5G terminal selects the cell or the PLMN with high priority, the candidate cell which does not belong to a non-allowed service area is preferentially selected to reside after the candidate cell is judged to meet the residence criterion. The method realizes the cell optimization when the 5G terminal is positioned in the edge area covered by the plurality of NR cells, and ensures the success rate of the terminal initiating normal service.
According to the analysis, and aiming at the problem that the terminal cannot perform normal service for a long time because the 5G terminal cannot trigger reselection or PLMN selection due to being in the limited service area as required by the 3GPP standard, the method for completing the NR cell optimization by combining the condition of the limited service area after the NR cell residence judgment is met in the cell selection or high-priority PLMN selection process of the 5G terminal is innovatively provided. The method realizes the cell optimization of the 5G terminal in the edge area of the NR cell, improves the normal service call completing rate of the 5G terminal and improves the user experience.
The relevant contents of cell classification, action restriction, 3GPP access service area restriction of 3GPP protocols are described in documents 3GPP TS 38.304-g00, 3GPP TS 23.501-g70, 3GPP TS 24.501-g 50.
Patent document CN112738717A (application number: CN202110084711.1) discloses a method for improving network searching efficiency of terminals in 5G SA and NSA, in which a 5G core network records and stores networking modes of base station cells, wherein the networking modes of the base station cells are indexed and identified by a physical cell ID PCI and geographical location information of the cell, and are synchronously written into a terminal or a SIM card by a network. When a terminal searches a network, a cell preference list which is in accordance with the current geographic position range is selected according to the networking mode and strategy of the terminal, and the frequency point scanning is carried out to monitor a primary synchronization signal PSS and a secondary synchronization signal SSS respectively to select cells in the cell preference list for carrying out downlink synchronization and random access processes. But this invention cannot achieve cell preference when the 5G terminal is in the edge area covered by multiple NR cells.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for improving the service connection rate of a 5G terminal.
The method for improving the service connection rate of the 5G terminal provided by the invention comprises the following steps:
step S1: selecting a cell, searching cell information, and reading system information of the cell;
step S2: judging whether the current cell meets the criterion of residing;
step S3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
step S4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
Preferably, in the step S1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information of network broadcast;
preferably, in the step S2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
preferably, in the step S3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. completing system information reading of all searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, and ending the process;
preferably, in the step S4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
Preferably, in the step S3 or S4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
The system for improving the service connection rate of the 5G terminal provided by the invention comprises the following components:
module M1: selecting a cell, searching cell information, and reading system information of the cell;
module M2: judging whether the current cell meets the criterion of residing;
module M3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
module M4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
Preferably, in said module M1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information of network broadcast;
preferably, in said module M2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
preferably, in said module M3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. completing system information reading of all searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, and ending the process;
preferably, in said module M4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
Preferably, in said module M3 or M4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention improves the success rate of the 5G terminal for initiating the normal service, can realize the cell optimization when the 5G terminal is positioned in the edge area covered by a plurality of NR cells, improves the success rate of the user for initiating the normal service and improves the user experience;
2. the invention ensures the network load in the service restriction area, and the network sets some special areas as the service restriction area, which is generally based on the service requirement of the special terminal.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of the present invention;
fig. 2 is a scene diagram.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1:
the method for improving the service connection rate of the 5G terminal provided by the invention, as shown in fig. 1-2, includes:
step S1: selecting a cell, searching cell information, and reading system information of the cell;
step S2: judging whether the current cell meets the criterion of residing;
step S3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
step S4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
Specifically, in the step S1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information of network broadcast;
specifically, in the step S2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
specifically, in the step S3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. completing system information reading of all searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, and ending the process;
specifically, in the step S4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
Specifically, in the step S3 or S4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
Example 2:
example 2 is a preferred example of example 1, and the present invention will be described in more detail.
Those skilled in the art can understand that the method for improving the 5G terminal service completion rate provided by the present invention is a specific implementation manner of a system for improving the 5G terminal service completion rate, that is, the system for improving the 5G terminal service completion rate can be implemented by executing the step flow of the method for improving the 5G terminal service completion rate.
The system for improving the service connection rate of the 5G terminal provided by the invention comprises the following components:
module M1: selecting a cell, searching cell information, and reading system information of the cell;
module M2: judging whether the current cell meets the criterion of residing;
module M3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
module M4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
Specifically, in the module M1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information of network broadcast;
specifically, in the module M2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
specifically, in the module M3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. completing system information reading of all searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, and ending the process;
specifically, in the module M4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
In particular, in said module M3 or M4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
Example 3:
example 3 is a preferred example of example 1, and the present invention will be described in more detail.
According to the behavior of the 5G terminal in the cell selection process, a cell optimization method for improving the service call completing rate of the 5G terminal at the edge of the NR cell is proposed, and the flow of the method is shown in fig. 1.
The process flow is described as follows:
step 1: and the terminal searches a cell list under the current network environment in the cell selection process.
Step 2: and the terminal reads the system messages of the cells in sequence according to the searched cell information.
And step 3: and the terminal judges whether the current cell meets the residence criterion or not according to the searched cell information and the read residence related configuration parameters in the cell system information.
And 4, step 4: if the current cell meets the residence criterion, the terminal continues to judge that the current cell does not belong to non-allowed service area, the terminal preferentially selects the cell to reside, and the process is ended.
And 5: if the current cell meets the resident criterion, the terminal continuously judges that the current cell belongs to non-allowed service area, the terminal records the candidate cell and continuously reads the system messages of other searched cells.
Step 6: and if the current cell does not meet the residing criterion, the terminal continuously reads the system messages of other searched cells.
And 7: and if the terminal finishes the system message reading of all the searched cells, selecting one recorded candidate cell to reside.
And 8: the flow ends.
In step 4/5, the non-allowed service area is configured by the network through a REGISTRATION response MESSAGE (REGISTRATION ACCEPT MESSAGE) or a CONFIGURATION UPDATE MESSAGE (CONFIGURATION UPDATE COMMAND MESSAGE). If the network is not configured, the non-allowed service area is considered to be empty.
Example 4:
example 4 is a preferred example of example 1, and the present invention will be described in more detail.
According to the technical scheme, in the process of executing cell selection, after the residence judgment criterion meets the condition, the 5G terminal preferentially selects the cell without service limitation to reside by combining with the judgment of the service limitation.
Taking the scenario shown in fig. 2 as an example, the current network includes NR cell 1 and NR cell 2, and a terminal NR cell 1 and NR cell 2 are edge regions, and NR cell 1 and NR cell 2 both satisfy a criterion of normal camping for the terminal, but NR cell 1 is configured as non-allowed service area for the terminal, and NR cell 2 is not configured as non-allowed service area for the terminal.
According to the method, the cell optimization process performed by the 5G terminal is described as follows:
1. the terminal searches for an NR cell 1 and an NR cell 2, reads a system message of the NR cell 1, determines that the NR cell 1 meets a normal residence criterion, but the NR cell 1 belongs to a non-allowed service area, and records the NR cell 1 as a candidate cell.
2. And the terminal continuously reads the system message of the NR cell 2, and judges that the NR cell 2 meets the normal residence criterion and the NR cell 2 does not belong to a non-allowed service area.
3. The terminal selects the preferential residing NR cell 2, and then can normally initiate the service flow.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A method for improving the service connection rate of a 5G terminal is characterized by comprising the following steps:
step S1: selecting a cell, searching cell information, and reading system information of the cell;
step S2: judging whether the current cell meets the criterion of residing;
step S3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
step S4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
2. The method for improving the service connection rate of the 5G terminal according to claim 1, wherein in the step S1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information broadcast by the network.
3. The method for improving the service connection rate of the 5G terminal according to claim 1, wherein:
in the step S2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
in the step S3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
4. The method for improving the service connection rate of the 5G terminal according to claim 1, wherein in the step S4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
5. The method of claim 1, wherein in the step S3 or S4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
6. A system for improving the service connection rate of a 5G terminal is characterized by comprising the following components:
module M1: selecting a cell, searching cell information, and reading system information of the cell;
module M2: judging whether the current cell meets the criterion of residing;
module M3: the current cell does not meet the residence criterion, and continues to read system messages of other searched cells until the residence criterion is met or a candidate cell of all search selection records is resided; judging whether the current cell belongs to a service area which is not allowed or not when the current cell meets the resident criterion;
module M4: the terminal records the candidate cell and continues to read system messages of other searched cells until the cell meeting the residence criterion and not belonging to the service area is resided, or residence judgment of all the searched cells is completed, and a recorded candidate cell is selected to reside; and the current cell does not belong to the service area which is not allowed to service, and the cell is preferentially selected to reside.
7. The system for improving the service connection rate of the 5G terminal according to claim 6, wherein in the module M1:
the terminal searches a cell list under the current network environment in the cell selection process, and sequentially reads system messages of the cells according to the searched cell information;
cell selection, cell information search and information reading are carried out by utilizing a basic communication technology of 5G; the searched cell information includes: frequency points of the cells, scrambling codes of the cells and signal intensity of the cells;
the read information refers to system information broadcast by the network.
8. The system for improving the service connection rate of the 5G terminal according to claim 6, wherein:
in the module M2:
the terminal judges whether the residence criterion is met according to the 3GPP protocol according to the searched cell information and the read residence related configuration parameters in the cell system information;
in the module M3:
when the current cell does not meet the residence criterion, the condition for continuing reading is that one of the following two conditions is met:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
9. The system for improving the service connection rate of the 5G terminal according to claim 6, wherein in the module M4:
when the current cell belongs to the service area which is not allowed to be operated, the condition for continuously reading and finishing is to meet one of the following two conditions:
a. if the current cell meets the residence criterion and does not belong to the service area which is not allowed, the terminal prefers the cell to reside, and the process is finished;
b. and finishing the system information reading of all the searched cells, selecting a cell meeting the residence condition to reside, or selecting a cell not meeting the condition to reside, wherein the cell cannot reside, and ending the process.
10. The system for improving the service connection rate of 5G terminals according to claim 3, wherein in the module M3 or M4:
if the terminal finishes reading the system messages of all the searched cells, selecting a recorded candidate cell to reside, and judging whether the cell can reside but belongs to a service area which is not allowed to be resident by searching and reading the system messages before, wherein the cell can be recorded as the candidate cell;
whether the cell belongs to the service area of the unallowable service is not judged in the criterion of selecting the candidate cell, so that the cell meeting the residence criterion has probability of belonging to the service area of the unallowable service, and the service cannot be initiated when the service area is in the service area;
when a plurality of candidate cells exist, the cell which does not belong to the service area which is not allowed to be operated is selected to be resident.
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