CN109195190B - Method and terminal for cell reselection - Google Patents
Method and terminal for cell reselection Download PDFInfo
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- CN109195190B CN109195190B CN201811240210.2A CN201811240210A CN109195190B CN 109195190 B CN109195190 B CN 109195190B CN 201811240210 A CN201811240210 A CN 201811240210A CN 109195190 B CN109195190 B CN 109195190B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The invention provides a method and a terminal for cell reselection, wherein the method comprises the following steps: when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell; acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows a terminal to access or not through the first system information block; when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; initiating a reselection request to the reselection target cell, and finishing reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block. The invention realizes the effect of fast connection of paging message monitoring between the current service cell and the target cell when the terminal reselects the cell, thereby greatly reducing the probability of missed calls during the reselection of the terminal.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and a terminal for cell reselection.
Background
When no data is transmitted, the LTE/NB-IoT/eMTC terminal waits in an IDLE state (IDLE), and during the IDLE state, it needs to complete mobility management and Paging Information (Paging) monitoring functions according to broadcast Information (System Information) configuration of a base station cell.
The broadcast Information of the cell is divided into a plurality of system Information blocks SIB (system Information Block), the terminal needs to acquire the SIBs in sequence according to a certain sequence, and the specific time for acquiring each SIB is different and is determined by the specific configuration of the base station. Wherein, the SIB1 (systemlnformation Block 1) contains basic information of Cell access, before the terminal accesses the Cell, the terminal must first obtain SIB1, so as to determine whether the Cell is a Cell (Suitable Cell) Suitable for access according to the information; SIB2 System Information Block 2) includes configuration Information for the terminal to monitor the cell paging message, and if the terminal cannot acquire SIB2, the terminal cannot monitor the Information for paging the terminal, which may result in call leakage.
The transmission period of SIB2 in NB-IoT may be up to 40.96 seconds, that is, in an extreme case, the terminal may not receive the paging message in 40.96 seconds, resulting in missed call in about 40 seconds.
Disclosure of Invention
The invention aims to provide a method for cell reselection of an LTE/NB-IoT/eMTC terminal, which realizes that the paging message configuration of a current resident cell is always possessed (the paging configuration of a source cell is used before reselection and the paging configuration of a target cell is used immediately after reselection), so that the terminal achieves the effect of seamless connection of the paging message configuration between a current service cell and a reselected target cell, and the probability of call leakage of the terminal during reselection is greatly reduced.
The technical scheme provided by the invention is as follows;
the invention provides a method for reselecting a cell, which comprises the following steps:
when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows a terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
initiating a reselection request to the reselection target cell, and finishing reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
Specifically, the terminal initiates a reselection request to the reselected target cell after acquiring the second system information block, and immediately monitors the paging message of the reselected target cell after completing reselection. Compared with the traditional method, the invention reduces the handover time of the terminal monitoring the paging message during the period of acquiring the second system information block after finishing reselection, thereby reducing the call leakage rate.
Further preferably, in the method for cell reselection of the present invention, the performing neighboring cell detection further includes:
according to the broadcast information of the neighboring cells around the terminal, detecting the same-frequency cell and different-frequency cell to obtain the neighboring cell detection result of the terminal;
and performing reselection evaluation on the detection result of the adjacent cell according to a reselection criterion, and selecting the adjacent cell with the optimal reselection evaluation result as a reselection target cell.
Specifically, after the terminal acquires the detection result of the adjacent cell through the detection of the same-frequency cell and the different-frequency cell, the terminal performs reselection evaluation on the detection result according to the reselection criterion, thereby realizing the determination of the reselection target cell.
Further preferably, in a method for cell reselection of the present invention, the determining whether the reselection target cell allows the terminal to access further includes:
and when the reselection target cell does not allow the terminal to access, detecting the neighboring cell again to obtain another reselection target cell.
Specifically, in the present invention, after acquiring the second system information block of the target reselection cell, the terminal determines whether the target reselection cell allows the terminal to access, and if it is determined that the terminal is not allowed to access, performs the neighboring cell detection again, and acquires another reselection target cell, thereby implementing continuous and cyclic reselection process, and avoiding the terminal being unable to continue reselection because the reselection target cell does not allow access.
Preferably, the reselection target cell that is determined not to be allowed to access by the terminal is added to the blacklist, and is no longer used as the reselection target cell within a preset time range, so that reduction of reselection efficiency due to repeated use of the cell that is not allowed to access by the terminal as the reselection target cell is avoided.
Further preferably, in a method for performing cell reselection in the present invention, before completing reselection of the reselection target cell, the method further includes:
and when the reselection of the reselection target cell fails, the detection of the neighboring cell is carried out again to obtain another reselection target cell.
Specifically, in the present invention, after the terminal acquires the second system information block of the reselection target cell, a reselection request is initiated to the reselection target cell, and if reselection fails, another cell reselection cycle is entered, neighboring cell detection is performed again, and another reselection target cell is acquired, so that continuous and cyclic reselection process is realized, and the terminal cannot continue reselection due to reselection failure.
Further preferably, in a method for cell reselection of the present invention, after the terminal monitors the paging message of the reselection target cell, the method further includes:
the terminal reads other system information blocks of the reselection target cell;
and when the terminal is in the idle state again, the neighbor cell detection is carried out again, and another reselection target cell is obtained.
Specifically, in the present invention, when the terminal completes reselection and successfully monitors the paging message of the reselection target cell, the terminal continues to read other system information blocks of the reselection target cell. When the terminal is in the idle state again, the neighbor cell detection is carried out again, another reselection target cell is obtained, the terminal is enabled to circularly and continuously carry out new reselection, and therefore the terminal can continuously obtain the optimal cell confirmed by the reselection criterion to carry out call monitoring.
The invention also provides a terminal for cell reselection, comprising:
the detection module is used for detecting the adjacent cell when the terminal is in an idle state to acquire a reselection target cell;
the first acquisition module is used for acquiring a first system information block of the reselection target cell and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
the judging module is used for judging whether the reselected target cell allows the terminal to access or not through the first system information block of the reselected target cell acquired by the first acquiring module;
the second acquisition module is used for acquiring a second system information block of the reselection target cell when the judgment module judges that the reselection target cell allows the terminal to access; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
the reselection module initiates a reselection request to the reselection target cell and completes reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
Further, the detection module includes:
the detection submodule detects the cells with the same frequency and different frequencies according to the broadcast information of the adjacent cells around the terminal to obtain the adjacent cell detection result of the terminal;
and the selection submodule is used for performing reselection evaluation on the detection result of the adjacent cell according to a reselection criterion and selecting the adjacent cell with the optimal reselection evaluation result as a reselection target cell.
Further, when the determining module further determines that the target cell does not allow the terminal to access, the detecting module performs neighbor cell detection again to obtain another reselected target cell.
Further, when the reselection module initiates a reselection request to the reselection target cell and the reselection of the reselection target cell fails, the detection module performs neighbor cell detection again to obtain another reselection target cell.
Further, a terminal for performing cell reselection further includes a third obtaining module: after the terminal reselection module monitors the paging message of the reselection target cell, the third acquisition module reads other system information blocks of the reselection target cell;
and when the terminal is in the idle state again, the detection module carries out the detection of the adjacent cell again to obtain another reselection target cell.
The method and the terminal for cell reselection provided by the invention can bring at least one of the following beneficial effects:
1. when the terminal reselects the cell, after acquiring the first system information block of the target cell, the terminal continues to acquire the second system information block of the target cell, and then the terminal starts to reselect the target cell. After reselection is successful, paging message monitoring can be immediately carried out by using the paging message configuration in the second system information block, so that the problem of call missing caused by the conventional method for acquiring the second system information block of the target cell after reselection is finished before the second system information block is acquired is solved.
2. When the terminal reselects the cell, after the terminal acquires the second system information block of the target reselected cell, the terminal judges whether the target reselected cell allows the terminal to access, if the terminal is judged not to be allowed to access, the adjacent cell detection is carried out again, and another reselected target cell is acquired.
3. When the terminal reselects the cell, the reselection target cell which is judged not to be accessed by the terminal is added into the blacklist, and the reselection target cell is not taken as the reselection target cell within the preset time range, so that the phenomenon that the reselection efficiency is reduced because the cell which is not allowed to be accessed by the terminal is taken as the reselection target cell repeatedly is avoided.
Drawings
The above features, technical features, advantages and implementations of a method and terminal for cell reselection will be further explained in the following detailed description of preferred embodiments in a clearly understandable manner, in conjunction with the accompanying drawings.
Fig. 1 is a flow chart of one embodiment of a method of cell reselection of the present invention;
fig. 2 is a flow chart of yet another embodiment of a method of cell reselection of the present invention;
fig. 3 is a flow chart of another embodiment of a method of cell reselection of the present invention;
fig. 4 is a flow chart of yet another embodiment of a method of cell reselection of the present invention;
fig. 5 is a flow chart of another embodiment of a method of cell reselection of the present invention;
fig. 6 is a flow chart of yet another embodiment of a method of cell reselection of the present invention;
fig. 7 is a schematic structural diagram of a terminal performing cell reselection according to the present invention, wherein:
10-detection Module
11-detection submodule
12-selection submodule
20-first acquisition Module
30-judging Module
40-second acquisition Module
50-reselection Module
60-third acquisition Module
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
The conventional cell reselection main process is as follows:
(1) the terminal configures parameters according to the broadcast information of the Cell, and performs measurement on the same-frequency Cell and the different-frequency Cell to obtain a measurement result of a Neighbor Cell (Neighbor Cell);
(2) the terminal carries out Reselection Evaluation (Reselection Evaluation) on all the measured neighbor cell results according to Reselection Criteria (Reselection Criteria), and selects a Reselection candidate cell (Reselection candidate) with the best ranking as a Reselection target cell;
(3) the terminal tries to reselect to a target Cell, firstly tries to acquire an SIB1 of the target Cell so as to obtain basic information about whether the Cell allows the terminal to access, and if the SIB1 is acquired, judges that the Cell is a Cell (Suitable Cell) Suitable for access, the terminal starts to reselect to the Cell; if the SIB1 acquisition fails or the cell cannot be used as a cell suitable for access, restarting a new round of cell reselection evaluation;
(4) after the reselection to the target cell is successful, continuing to acquire other SIBs (generally SIB2, SIB3, SIB4, and SIB5) of the cell, and after acquiring the SIB2 of the target cell, obtaining the paging message related configuration of the cell, and starting to monitor the paging message in the cell.
In this process, if there is a paging message of the terminal during the period, the call will be missed because the terminal cannot listen to the paging message after the reselection to the target cell is successful and before the target cell SIB2 is acquired. The transmission period of SIB2 in NB-IoT may be up to 40.96 seconds, that is, in an extreme case, the terminal may not receive the paging message in 40.96 seconds, resulting in missed call in about 40 seconds.
In order to solve the problem of call leakage during reselection, and achieve the technical effects that during terminal reselection, after reselection is successful, the paging message configuration in the SIB2 can be used immediately, and the target cell SIB2 is not acquired after reselection, and call leakage is caused during acquisition of the SIB2, so that the probability of call leakage is reduced.
A first embodiment of the present invention, as shown in fig. 1, provides a method for cell reselection, including:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
a terminal refers to an LTE or NB-IoT or eMTC terminal.
The terminal idle state refers to a state that the terminal does not communicate with the current serving cell, and the communication service of the terminal cannot be influenced by cell switching at the moment.
The neighboring cells refer to other cells around the current serving cell, which can be detected by the terminal.
When the terminal is in an idle state, the neighboring cells around the current serving cell of the terminal need to be detected for obtaining a reselection target cell for reselection, so that the terminal can be ensured to be always connected with the cell with the optimal call quality for call message monitoring.
S200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
the basic information refers to information broadcasted by the cell, and includes parameters of system configuration information of each cell, such as system type, global identification number, absolute frequency number used by a channel, number of modules and terminals allowed to be accessed, and the like.
And after detecting the reselection target cell, the terminal acquires a first system information block of the reselection target cell, wherein the information in the first system information block is used for judging whether the selected reselection target cell allows the terminal to access, and if the selected reselection target cell allows the terminal to access, the terminal can enter the next step to continuously acquire other system information blocks of the reselection target cell to monitor the call message.
S300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
the configuration information refers to terminal configuration parameter information required by the terminal to connect with the target cell and monitor the cell paging message.
S410, a reselection request is sent to the reselection target cell, and the reselection of the reselection target cell is completed; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
Reselection refers to a process that a terminal selects an optimal cell to provide a call service by monitoring the signal quality of a neighboring cell and the current cell in an idle mode.
The configuration information refers to the relevant parameter information needed by the terminal to connect with the reselection target cell and monitor the paging message of the cell.
In the first embodiment of the present invention, after the first system information block of the reselection target cell is obtained in S200, the second system information block is continuously obtained in S300, and after the second system information block is successfully obtained, the reselection request operation is initiated to the reselection target cell in S410, which is performed after the reselection request operation is successfully obtained.
A second embodiment of the present invention, as shown in fig. 2, provides a method for performing cell reselection, including the steps of:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell; s110, according to the broadcast information of the adjacent cell around the terminal, carrying out same-frequency and different-frequency cell detection to obtain the adjacent cell detection result of the terminal;
s120, according to reselection criteria, performing reselection evaluation on the detection results of the neighboring cells, and selecting the neighboring cell with the optimal reselection evaluation result as a reselection target cell;
the reselection criterion refers to an algorithm for evaluating and sequencing the detected adjacent cells when the terminal performs cell reselection, and includes, but is not limited to, an S criterion, an R criterion, and an HCS criterion, and the algorithm is used to obtain that the optimal cell on the highest priority frequency is a reselection target cell.
S200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
s300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
s410, a reselection request is sent to the reselection target cell, and the reselection of the reselection target cell is completed; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
In the second embodiment, when the terminal is idle, the implementation step 110 obtains the detection result of the co-frequency cell and the inter-frequency cell around the current cell by using a detection method, where the detection result is a neighboring cell that can be a reselection candidate, that is, a neighboring cell detection result, and then the implementation step 120 evaluates the result of the neighboring cell detection by using reselection criteria specified by the terminal, where the reselection criteria include, but are not limited to, an S criterion, an R criterion, and the like, and obtains a neighboring cell with an optimal evaluation result by re-evaluating as a reselection target cell. Specifically, the second embodiment provides a method how to acquire a reselection target cell in a cell reselection process.
A third embodiment of the present invention, as shown in fig. 3, provides a method for cell reselection, including the steps of:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
s200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
s210, when the reselection target cell is judged not to allow the terminal to access, the neighbor cell detection is carried out again to obtain another reselection target cell;
s300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
and judging that the target cell is the cell which is not allowed to be accessed means that the terminal is judged not to be in the range which is allowed to be accessed by the target cell according to the terminal information of the cell which is allowed to be accessed in the first system information block.
S410, a reselection request is sent to the reselection target cell, and the reselection of the reselection target cell is completed; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
In the third embodiment, in S210, when the terminal determines that the target cell is a cell that is not allowed to access, that is, after acquiring the first system information block of the target cell, the terminal finds that the target cell refuses to provide a call service for the target cell, then it returns to S100 to reselect a new reselected target cell. A third embodiment provides a method, where after a terminal acquires a second system information block of a target reselected cell, it is determined whether the target reselected cell allows the terminal to access, and if it is determined that the terminal is not allowed to access, neighboring cell detection is performed again to acquire another reselected target cell, thereby implementing continuous and cyclic reselection, and avoiding that the terminal cannot continue reselection because the reselected target cell does not allow access.
Preferably, the reselection target cell that is determined not to be allowed to access by the terminal is added to the blacklist, and is no longer used as the reselection target cell within a preset time range, so that reduction of reselection efficiency due to repeated use of the cell that is not allowed to access by the terminal as the reselection target cell is avoided.
The fourth embodiment of the present invention, as shown in fig. 4: a method for cell reselection is provided, which comprises the following steps:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
s200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
s300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
s400, a reselection request is initiated to the reselection target cell;
s401, when the reselection of the reselection target cell fails, detecting the neighboring cell again to obtain another reselection target cell;
s411 completes reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
In the fourth embodiment, after the second system information block is obtained in S300, the terminal initiates a reselection request to the reselection target cell, and if reselection fails, the terminal returns to S100 to reselect a new reselection target cell, so that a reselection process is continuously and cyclically performed, and the terminal is prevented from being unable to perform reselection because the reselection target cell is not allowed to access.
Preferably, the reselection target cell that is determined not to be allowed to access by the terminal is added to the blacklist, and is no longer used as the reselection target cell within a preset time range, so that reduction of reselection efficiency due to repeated use of the cell that is not allowed to access by the terminal as the reselection target cell is avoided.
A fifth embodiment of the present invention, as shown in fig. 5, provides a method for performing cell reselection, including:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
s200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell.
S300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block contains configuration information of the terminal monitoring the paging message of the reselection target cell.
S410, a reselection request is sent to the reselection target cell, and the reselection of the reselection target cell is completed; monitoring the paging message of the reselection target cell in combination with the configuration information in the second system information block;
s420 the terminal reads other system information blocks of the reselection target cell;
and S430, when the terminal is in the idle state again, the neighboring cell detection is carried out again to obtain another reselection target cell.
In the fifth embodiment, after the terminal successfully completes S200 obtaining the first system information block of the reselection target cell and S300 obtaining the second system information block thereof, and performs S410 completing reselection of the reselection target cell, through the step S420, other system information blocks of the reselection target cell, including the third, fourth, and fifth system information blocks, and the like, are read, after the reading of the other system information blocks of the reselection target cell is completed, the step S430 is performed, and when the terminal enters an idle state again, a new reselection target cell is reselected. The fifth embodiment provides a method for ensuring that a terminal reselects in time when the terminal moves or the signal quality of a current serving cell and a neighboring cell changes, so that the terminal cyclically and continuously performs new reselection, and thus the terminal continuously acquires an optimal cell determined by a reselection criterion to perform call monitoring.
A sixth embodiment of the present invention, as shown in fig. 6, provides a method for cell reselection, including the steps of:
s100, when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
s120, according to reselection criteria, performing reselection evaluation on the detection results of the neighboring cells, and selecting the neighboring cell with the optimal reselection evaluation result as a reselection target cell;
s200, acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
s210, when the reselection target cell is judged not to allow the terminal to access, the neighbor cell detection is carried out again to obtain another reselection target cell;
s300, when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of the paging message of the reselection target cell monitored by the terminal;
s400, a reselection request is initiated to the reselection target cell;
s401, when the target cell reselection fails, the neighbor cell detection is carried out again to obtain another reselection target cell;
s411 completes reselection of the reselection target cell; monitoring the paging message of the reselection target cell in combination with the configuration information in the second system information block;
s420 the terminal reads other system information blocks of the reselection target cell;
and S430, when the terminal is in the idle state again, the neighboring cell detection is carried out again to obtain another reselection target cell.
In the sixth embodiment, when the terminal is idle, the implementation step 110 obtains, by a detection method, the detection result of the co-frequency cell and the inter-frequency cell around the current cell, that is, the neighboring cell that can be a reselection candidate, that is, the detection result of the neighboring cell, and then the implementation step 120 evaluates the result of the neighboring cell according to reselection criteria specified by the terminal, where the reselection criteria include, but are not limited to, an S criterion, an R criterion, and the like, and obtains, by re-evaluation, the neighboring cell with the optimal evaluation result as a reselection target cell.
After the terminal determines that the target cell is a cell that is not allowed to access S210, that is, after acquiring the first system information block of the target cell, the terminal finds that the target cell refuses to provide a call service for the target cell, and then returns to S100 to reselect a new reselected target cell. A third embodiment provides a method, where after a terminal acquires a second system information block of a target reselected cell, it is determined whether the target reselected cell allows the terminal to access, and if it is determined that the terminal is not allowed to access, neighboring cell detection is performed again to acquire another reselected target cell, thereby implementing continuous and cyclic reselection, and avoiding that the terminal cannot continue reselection because the reselected target cell does not allow access.
Preferably, the reselection target cell that is determined not to be allowed to access by the terminal is added to the blacklist, and is no longer used as the reselection target cell within a preset time range, so that reduction of reselection efficiency due to repeated use of the cell that is not allowed to access by the terminal as the reselection target cell is avoided.
After the second system information block is obtained in S300, the terminal initiates a reselection request to the reselected target cell, and if reselection fails, returns to S100 to reselect a new reselected target cell, thereby implementing continuous and cyclic reselection process, and avoiding that the terminal cannot continue reselection because the reselected target cell does not allow access.
Preferably, the reselection target cell that is determined not to be allowed to access by the terminal is added to the blacklist, and is no longer used as the reselection target cell within a preset time range, so that reduction of reselection efficiency due to repeated use of the cell that is not allowed to access by the terminal as the reselection target cell is avoided.
After the second system information block is acquired in S300, the step S410 is performed to complete reselection of the reselected target cell, and then other system information blocks, including the third, fourth, fifth system information blocks, and the like, of the reselected target cell are read in the step S420, and after the step S430 is completed to read other system information blocks of the reselected target cell, when the terminal enters an idle state again, a new reselected target cell is reselected. The fifth embodiment provides a method for ensuring that a terminal reselects in time when the terminal moves or the signal quality of a current serving cell and a neighboring cell changes, so that the terminal cyclically and continuously performs new reselection, and thus the terminal continuously acquires an optimal cell determined by a reselection criterion to perform call monitoring.
Compared with the traditional reselection operation step after the first system information block of the reselection target cell is obtained, the reselection operation step is carried out, when the reselection request operation is initiated, the paging message configuration information of the reselection target cell is obtained, paging can be carried out immediately, and the handover time of monitoring the paging message by the terminal during the period of obtaining the second system information block after reselection is reduced, so that the call leakage rate is reduced.
A seventh embodiment of the present invention, as shown in fig. 7, provides a terminal for performing cell reselection, where the terminal includes:
and the detection module 10 performs neighbor cell detection to obtain a reselection target cell when the terminal is in an idle state.
The detection module 10 includes:
the detection submodule 11 performs the same-frequency and different-frequency cell detection according to the broadcast information of the neighboring cells around the terminal to obtain the neighboring cell detection result of the terminal;
and the selecting submodule 12 performs reselection evaluation on the detection result of the neighboring cell obtained by the detecting submodule 11 according to a reselection criterion, and selects the neighboring cell with the optimal reselection evaluation result as a reselection target cell.
A first obtaining module 20, configured to obtain a first system information block of the reselected target cell selected by the selecting sub-module 12, and determine whether the reselected target cell allows a terminal to access through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell.
A determining module 30, configured to determine whether the reselecting target cell allows the terminal to access through the first system information block of the reselecting target cell acquired by the first acquiring module 20;
when the determining module 30 further determines that the target cell does not allow the terminal to access, the detecting module 10 performs neighbor cell detection again to obtain another reselected target cell.
A second obtaining module 40, configured to obtain a second system information block of the reselection target cell when the determining module 30 determines that the reselection target cell allows the terminal to access; the second system information block contains configuration information of the terminal monitoring the paging message of the reselection target cell.
A reselection module 50, configured to initiate a reselection request to the reselection target cell after the second obtaining module 40 obtains the second system information block, and complete reselection of the reselection target cell; monitoring the paging message of the reselection target cell in combination with the configuration information in the second system information block;
when the reselection module 50 initiates a reselection request to the reselection target cell and the reselection of the reselection target cell fails, the detection module 10 performs neighbor cell detection again to obtain another reselection target cell.
A third obtaining module 60, where after the terminal reselection module 50 monitors the paging message of the reselection target cell, the third obtaining module 60 reads other system information blocks of the reselection target cell.
When the terminal is in the idle state again, the detection module 10 performs neighbor cell detection again to obtain another reselection target cell.
Specifically, this embodiment is an embodiment of the apparatus of the sixth embodiment, and the technical solutions and technical effects adopted by the embodiment are the same as those of the sixth embodiment, and are not described herein again.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for performing cell reselection, comprising the steps of:
when the terminal is in an idle state, detecting a neighboring cell to obtain a reselection target cell;
acquiring a first system information block of the reselection target cell, and judging whether the reselection target cell allows a terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
when the reselection target cell allows the terminal to access, acquiring a second system information block of the reselection target cell; the second system information block comprises configuration information of paging information of the reselected target cell monitored by the terminal;
initiating a reselection request to the reselection target cell, and finishing reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
2. The method of claim 1, wherein the performing neighbor cell detection and acquiring a reselection target cell comprises:
according to the broadcast information of the neighboring cells around the terminal, detecting the same-frequency cell and different-frequency cell to obtain the neighboring cell detection result of the terminal;
and performing reselection evaluation on the detection result of the adjacent cell according to a reselection criterion, and selecting the adjacent cell with the optimal reselection evaluation result as a reselection target cell.
3. The method of claim 1, wherein after determining whether the reselection target cell allows the terminal to access, the method further comprises:
and when the reselection target cell does not allow the terminal to access, detecting the neighboring cell again to obtain another reselection target cell.
4. The method of claim 1, wherein before completing the reselection of the reselection target cell, the method further comprises:
and when the reselection of the reselection target cell fails, the detection of the neighboring cell is carried out again to obtain another reselection target cell.
5. The method for cell reselection according to any one of claims 1-4, wherein after the terminal monitors the paging message of the reselection target cell, the method further comprises the steps of:
the terminal reads other system information blocks of the reselection target cell, and the terminal is in an idle state again;
and when the terminal is in the idle state again, the neighbor cell detection is carried out again, and another reselection target cell is obtained.
6. A terminal for performing cell reselection, the terminal comprising:
the detection module is used for detecting the adjacent cell when the terminal is in an idle state to acquire a reselection target cell;
the first acquisition module is used for acquiring a first system information block of the reselection target cell and judging whether the reselection target cell allows the terminal to access or not through the first system information block; the first system information block contains basic information whether the terminal is allowed to access the reselection target cell or not;
the judging module is used for judging whether the reselected target cell allows the terminal to access or not through the first system information block of the reselected target cell acquired by the first acquiring module;
the second acquisition module is used for acquiring a second system information block of the reselection target cell when the judgment module judges that the reselection target cell allows the terminal to access; the second system information block comprises configuration information of paging information of the reselected target cell monitored by the terminal;
the reselection module initiates a reselection request to the reselection target cell and completes reselection of the reselection target cell; and monitoring the paging message of the reselection target cell by combining the configuration information in the second system information block.
7. The terminal of claim 6, wherein the detecting module comprises:
the detection submodule detects the cells with the same frequency and different frequencies according to the broadcast information of the adjacent cells around the terminal to obtain the adjacent cell detection result of the terminal;
and the selection submodule is used for performing reselection evaluation on the detection result of the adjacent cell according to a reselection criterion and selecting the adjacent cell with the optimal reselection evaluation result as a reselection target cell.
8. The terminal for cell reselection according to claim 6, wherein:
and when the judging module further judges that the target cell does not allow the terminal to access, the detecting module performs neighbor cell detection again to obtain another reselected target cell.
9. The terminal for cell reselection according to claim 6, wherein:
and when the reselection module initiates a reselection request to the reselection target cell and the reselection of the reselection target cell fails, the detection module performs neighbor cell detection again to acquire another reselection target cell.
10. The terminal of claim 6, further comprising a third obtaining module:
after the terminal reselection module monitors the paging message of the reselection target cell, the third acquisition module reads other system information blocks of the reselection target cell;
and when the terminal is in the idle state again, the detection module carries out the detection of the adjacent cell again to obtain another reselection target cell.
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| CN111294883B (en) * | 2019-01-31 | 2021-12-14 | 展讯通信（上海）有限公司 | Cell reselection method and device, storage medium and user terminal |
| CN112889316B (en) * | 2019-05-20 | 2022-10-21 | Oppo广东移动通信有限公司 | Cell reselection method and device, and terminal |
| WO2021243636A1 (en) * | 2020-06-04 | 2021-12-09 | Qualcomm Incorporated | Inter-radio access technology reselection |
| CN114640952B (en) * | 2020-12-15 | 2023-11-03 | 上海华为技术有限公司 | Message processing method, terminal and network equipment |
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