CN106912080B - Method and system for reselecting cell and applicable mobile terminal - Google Patents
Method and system for reselecting cell and applicable mobile terminal Download PDFInfo
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- CN106912080B CN106912080B CN201510973914.0A CN201510973914A CN106912080B CN 106912080 B CN106912080 B CN 106912080B CN 201510973914 A CN201510973914 A CN 201510973914A CN 106912080 B CN106912080 B CN 106912080B
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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
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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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
Abstract
The invention provides a method and a system for reselecting a cell and a mobile terminal suitable for the method and the system. The mobile terminal may access a plurality of mobile network types. The method comprises the following steps: acquiring network quality information communicated with each adjacent cell according to each network type which can be accessed; according to the preset priority sequence of each network type, starting from the network type with the lowest priority in each adjacent cell, comparing whether the network quality information of the adjacent cells reaches a preset threshold corresponding to the network type one by one, and starting reselection timing corresponding to the network type with the comparison result reaching the corresponding threshold one by one until the network type with the earliest overtime in the reselection timing is determined; wherein the reselection time length corresponding to the high-priority network type is not greater than the reselection time length corresponding to the low-priority network type; and selecting the adjacent cell corresponding to the determined network type according to the determined network type. The invention effectively solves the problem of unbalanced mechanism of cell reselection.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a system for reselecting a cell, and a mobile terminal suitable for the method and the system.
Background
The development of mobile communication is changing day by day, from the early 2G network GSM, to the 3G network TD-SCDMA/WCDMA, and to the 4G LTE that has come into wide use in recent years, the services that mobile terminals can provide are increasing, and the operation speed is also increasing. Because of the huge network investment of the mobile communication system, the construction period of each generation of mobile communication network often spans from several years to ten years, even more than twenty years, so that networks of different standards exist simultaneously in the same period. And this condition will be maintained for a long time. Therefore, for a mobile terminal supporting multiple systems, a reselection function between different systems is essential.
In the process of operating a network, a mobile operator generally wants to be able to camp on a network with a higher priority system as much as possible, and the general priority order is LTE >3G >2G, that is, the network priority of LTE is the highest. When the terminal resides in a cell of a certain system, if the area covered by the cell of a higher priority system is reached, the network always hopes that the terminal can be reselected to the cell of the higher priority system. Since the higher priority cells generally have larger network capacity, can provide higher rate, and have higher spectrum utilization, more cells using higher priority can maximize the investment benefit. In order to make the terminal able to reselect to the cell with higher system priority as much as possible, some methods are described in the protocol of 3GPP, and there are some descriptions of tendencies. However, in the current reselection mechanism, too much stay in the high-priority cell, so that the high-priority cell cannot provide a good communication service; or a low priority cell is preferentially selected so that the mobile terminal cannot obtain better network service.
Accordingly, there is a need for improvements in the art.
Disclosure of Invention
The embodiment of the invention provides a method and a system for reselecting a cell and a mobile terminal suitable for the method and the system, which are used for solving the problem of unbalanced cell reselection mechanism in the prior art.
In view of the above, the present invention provides a method for reselecting a cell, which is used for a mobile terminal capable of accessing multiple mobile network types, and comprises: when the monitored network quality information communicated with the current cell is reduced to a reselection threshold, acquiring the network quality information communicated with each adjacent cell according to each network type which can be accessed; according to the preset priority sequence of each network type, starting from the network type with the lowest priority in each adjacent cell, comparing whether the network quality information of the adjacent cells reaches a preset threshold corresponding to the network type one by one, and starting reselection timing corresponding to the network type with the comparison result reaching the corresponding threshold one by one until the network type with the earliest overtime in the reselection timing is determined; wherein the reselection time length corresponding to the high-priority network type is not greater than the reselection time length corresponding to the low-priority network type; and selecting the adjacent cell corresponding to the determined network type according to the determined network type.
Preferably, the comparing step of comparing the network quality information of the neighboring cells one by one to determine whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type, and the starting step of starting the reselection timing corresponding to the network type with the comparison result that the network type reaches the corresponding threshold one by one includes: presetting a plurality of timers for timing fixed time duration, wherein each timer corresponds to a network type; 1) comparing the network quality information corresponding to the network type with the lowest priority in the adjacent cells with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting a corresponding untimed timer, and executing the step 2); if not, executing the step 2); 2) comparing network quality information corresponding to the network type with the higher priority in the adjacent cell with whether the network quality information reaches a corresponding preset threshold or not; if yes, executing step 3); if not, repeatedly executing the step 2); 3) starting an untimed timer corresponding to the current priority network type and restarting each timer which is timing and is lower than the current priority; and (5) repeatedly executing the step 2) until all the adjacent cells are compared, monitoring the network type corresponding to the timer with the first overtime timing, and determining the network type with the first overtime reselection timing according to the monitored network type.
Preferably, during the time that each monitored timer has not timed out, the method further comprises: re-acquiring the network quality information of each adjacent cell; repeating steps 1) -3); and when the network quality information of each adjacent cell does not reach the corresponding preset threshold, closing the timing of the timer which is timing and corresponds to the network type of the current adjacent cell.
Preferably, the method further comprises the following steps: counters corresponding to the timers; when the timer is started/restarted each time, indicating a counter corresponding to the timer to add 1 until the count value of the counter reaches a preset count threshold, and stopping restarting the timer corresponding to the counter; at each time the timer is turned off, the counter is turned off at the same time.
Preferably, the method further comprises the following steps: before the reselection timing is not monitored to be overtime, the network quality information of each adjacent cell is repeatedly acquired, whether the network quality information of the adjacent cells reaches a preset threshold corresponding to the network type is compared one by one from the network type with the lowest priority, and the reselection timing corresponding to the network type with the comparison result that the network quality information of the adjacent cells does not reach the corresponding threshold is closed one by one.
Based on the above object, the present invention further provides a system for reselecting a cell, which is used for a mobile terminal capable of accessing multiple mobile network types, and comprises: the reselection starting module is used for acquiring the network quality information communicated with each adjacent cell according to each network type which can be accessed when the monitored network quality information communicated with the current cell is reduced to a reselection threshold; a reselection module, configured to compare, one by one, whether network quality information of neighboring cells reaches a preset threshold corresponding to a network type from a network type with a lowest priority in neighboring cells according to a preset priority ranking of each network type, and start a reselection timer, whose comparison result is a network type that reaches the corresponding threshold, one by one, until determining a network type that is the earliest overtime in the reselection timer; wherein the reselection time length corresponding to the high-priority network type is not greater than the reselection time length corresponding to the low-priority network type; and the access module is used for selecting and accessing the adjacent cell corresponding to the determined network type according to the determined network type.
Preferably, a plurality of timers for timing fixed time duration are preset in the reselection module, and each timer corresponds to one network type; the reselection module comprises: the first comparison sub-module is used for comparing the network quality information corresponding to the network type with the lowest priority in the adjacent cells with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting a corresponding untimed timer, and executing a second comparison submodule; if not, executing a second comparison submodule; the second comparison submodule is used for comparing network quality information corresponding to the network type with the higher priority in the adjacent cell with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting an untimed timer corresponding to the current priority network type, restarting each timer which is lower than the current priority and timing, and repeatedly executing the second comparison sub-module; if not, the second comparison submodule is executed repeatedly; and until all the adjacent cells are compared, the second comparison submodule is also used for determining the network type corresponding to the timer with the first overtime timing and determining the network type with the first overtime reselection timing according to the monitored network type.
Preferably, during the time that each monitored timer has not timed out, the second comparing sub-module is further configured to instruct the reselection starting module to reacquire the network quality information of each neighboring cell; the first comparison submodule and the second comparison submodule are also used for closing the timing of the timing timer corresponding to the network type of the current adjacent cell when the network quality information of each adjacent cell does not reach the corresponding preset threshold.
Preferably, the method further comprises the following steps: counters corresponding to the timers; the second comparison submodule is also used for indicating a counter corresponding to the timer to add 1 when the timer is started/restarted each time until the count value of the counter reaches a preset count threshold, and the timer corresponding to the counter is not restarted any more; the first and second comparison sub-modules are further configured to simultaneously turn off the counter each time the timer counts.
Preferably, the method further comprises the following steps: before the reselection timing is not monitored to be overtime, the reselection module is further configured to instruct the reselection starting module to repeatedly acquire the network quality information of each neighboring cell, compare whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type one by one from the network type with the lowest priority, and close the reselection timing corresponding to the network type whose comparison result is that the network type does not reach the corresponding threshold one by one.
Based on the above object, the present invention further provides a mobile terminal, comprising: a system for reselecting a cell as described in any one of the above.
As described above, the method, system and mobile terminal for reselecting a cell according to the present invention have the following advantages: setting reselection timings with different reselection durations aiming at network types with different priorities, thereby effectively solving the problems that cells with high priorities cannot be selected or always reside in cells with high priorities and low network quality when multiple network types are reselected; in addition, the equal-time-length timers are adopted, and when the network quality of the high-priority adjacent cell is higher than the corresponding threshold, the timers with low priority and timing are restarted, so that the restarting time length of low priority can be fully prolonged, and time delay is provided for reselecting the high-priority adjacent cell; meanwhile, when the quality of the high-priority cell is not good, the probability that the adjacent cell with low priority is selected is increased; in addition, during the time that each timer is not overtime, the times of reselection judgment are increased, and the selected adjacent cells can be ensured to provide stable network communication; in addition, in order to prevent the reselection judgment from being performed too long, the invention also adopts a counter counting mode to limit the restarting times of the timer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a method flow diagram of one embodiment of a method of reselecting a cell of the present invention.
Fig. 2 is a method flow diagram of yet another embodiment of a method of reselecting a cell of the present invention.
Fig. 3 is a method flow diagram of yet another embodiment of a method of reselecting a cell of the present invention.
Fig. 4 is a block diagram of the structure of one embodiment of the system for reselecting a cell of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the present invention provides a method for reselecting a cell. The reselection method is primarily performed by a reselection system. The reselection system is installed in a mobile terminal. Wherein the mobile terminal includes but is not limited to: cell phones, wearable electronics, and the like. The mobile terminal comprises a plurality of communication modules, and each communication module is correspondingly accessed to a mobile network type (hereinafter referred to as network type). The communication module includes but is not limited to: a GSM communication module, an LTE communication module, a 3G communication module and the like. And after the mobile terminal is accessed to the current cell, the mobile terminal detects the network quality information of the current cell at regular time.
If the current accessed cell is a GSM cell, the mobile terminal acquires RSSI (signal strength indicator) regularly during the idle state. And the reselection system determines whether to reselect the cell according to the comparison between the RSSI and a preset RSSI threshold. For example, when the reselection system detects that the RSSI is less than or equal to an RSSI threshold, it determines to reselect a cell; otherwise, the next time the timing is reached, the detection is performed again. The step of reselecting a cell is as follows.
In step S1, when it is monitored that the network quality information communicated with the current cell falls to the reselection threshold, the reselection system obtains the network quality information communicated with each neighboring cell according to each of the network types that can be accessed.
Specifically, the reselection system sends network quality test information corresponding to the network type through each communication module included in the mobile terminal, and after receiving the network quality test information, the neighboring cell feeds back the network quality test information. The reselection system obtains network quality information for communication with each neighboring cell.
The network quality information includes, but is not limited to, at least two of: RSSI, RSCP (received signal code power), RSRP (reference signal received power). The network quality information received by the GSM communication module is RSSI, the network quality information received by the 3G communication module (such as WCDMA) is RSCP, and the network quality information received by the LTE communication module is RSRP.
It should be noted that, as those skilled in the art should understand, the above-mentioned manner of acquiring the network quality information is only an example, and a new communication module appears in the future, and the reselection system acquires the corresponding network quality information according to a channel detection manner of the new communication module and the corresponding cell.
In step S2, the reselection system compares, according to the preset priority ranking of each network type, from the network type with the lowest priority in each neighboring cell, whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type one by one, and starts reselection timing, of which the comparison result is the network type that reaches the corresponding threshold, one by one until determining the network type that is the earliest time out of the reselection timing.
Here, the priorities of the network types are exemplified from low to high as: 2G type, 3G type, 4G type. Wherein the 3G types include: CDMA, WCDMA, TD-CDMA, etc. The 2G types include: GSM. The 4G types include: LTE.
It should be noted that the above network types are only examples, and new network types that come in the future can be configured to re-adjust the priority of each network type according to actual needs.
Here, each reselection time period may be performed by a timer corresponding to a network type. Different reselection time lengths can be preset in each timer. And the reselection time length corresponding to the high-priority network type is not more than the reselection time length corresponding to the low-priority network type. In a preferred mode, for two reselection durations corresponding to adjacent priorities, the reselection duration corresponding to the low priority is greater than the sum of the reselection duration corresponding to the high priority and the duration of the step of determining the network quality information.
Here, the reselection timing timeout refers to a time-out stopping due to a timer starting and counting the reselection time.
Specifically, after receiving the network quality information fed back by each neighboring cell, the reselection system may determine the network type of each neighboring cell that can currently communicate with. The reselection system also independently sets reselection timers for each network type, and each reselection timer can start reselection timing at the time set by the reselection system.
For example, the low-to-high priority order preset by the reselection system is as follows: GSM and CDMA. Starting from the network type with the lowest priority in each adjacent cell, the reselection system firstly compares whether the network quality information of the adjacent cell based on the GSM reaches a preset GSM threshold; if not, continuously comparing whether the network quality of the adjacent cell based on the CDMA reaches the preset threshold of the CDMA.
And then, when the reselection system determines that the network quality of the adjacent cells based on the CDMA is lower than a preset threshold of the CDMA, determining that all the adjacent cells are not suitable for access, and continuing to reside in the current cell.
For another example, if the reselection system determines that the network quality information of the neighboring cell based on GSM reaches the preset GSM threshold, the timer T1 corresponding to GSM is started to start reselection timing, and then the network quality of the neighboring cell based on CDMA is continuously compared to determine whether the network quality information of the neighboring cell based on GSM reaches the preset CDMA threshold.
When the reselection system determines that the network quality of the neighboring cell based on the CDMA is higher than or equal to a preset CDMA threshold, starting a timer T2 corresponding to the CDMA to start reselection timing, and waiting for the two timers to be overtime, in which case, the timer T2 will be overtime first because the reselection time of the timer T2 is less than the reselection time of the timer T1, the reselection system determines that the network type is the CDMA, and performs step S3
In a preferred scheme, before the reselection system waits for the timing of the two timers to end, the reselection system repeatedly acquires the network quality information of each neighboring cell, compares the network quality information of the neighboring cells one by one from the network type with the lowest priority to determine whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type, and closes the reselection timing corresponding to the network type with the comparison result that the network quality information of the neighboring cells does not reach the corresponding threshold one by one.
Still taking the above reselection schemes of the CDMA neighboring cell and the GSM neighboring cell as an example, if the reselection system determines that the network quality information of both the CDMA-based neighboring cell and the GSM-based neighboring cell is always higher than or equal to the respective corresponding thresholds, since the reselection time corresponding to the CDMA is shorter than the reselection time corresponding to the GSM, it means that the timer corresponding to the CDMA is earlier than the timer corresponding to the GSM and times out, the reselection system determines that the network type corresponding to the timer which is the earliest time out is CDMA, and performs step S3.
If the network quality information of the neighboring cell based on GSM is always higher than or equal to the corresponding threshold and the network quality information of the neighboring cell based on CDMA is lower than the corresponding threshold, which means that the timer corresponding to CDMA is closed in advance before timeout occurs, the timer corresponding to GSM must be timed out first, and the reselection system determines that the network type corresponding to the timer which is timed out first is GSM, and performs step S3.
In step S3, the reselection system selects a neighboring cell corresponding to the determined network type for access according to the determined network type.
The reselection system may issue an access request to a corresponding neighboring cell according to the determined network type to perform an access procedure with the neighboring cell.
Here, performing the access procedure with the neighboring cell is prior art and will not be described in detail here.
Example two
Unlike the first embodiment, the complexity of reselection system improvement is reduced for downward compatibility. A plurality of timers for timing fixed time length are preset in the reselection system. Each timer corresponds to a network type. After the reselection system has performed step S1, the reselection system performs the following steps. As shown in fig. 2.
In step S21, the reselection system compares the network quality information corresponding to the network type with the lowest priority in the neighboring cells with whether a corresponding preset threshold is reached; if yes, starting a corresponding untimed timer, and executing step S22; if not, step S22 is executed.
Herein, the untimed timer means that the timer is not running yet. At this point the timer may never be started or have stopped timing due to a condition.
Here, the timer that is counting time means that the timer has started reselection timing under the current condition and has not timed out yet. The timing mode of closing the timer in timing is as follows: the reselection system stops the timer that is counting.
In step S22, the reselection system compares the network quality information corresponding to the network type with the higher priority in the neighboring cell with whether the network quality information reaches a preset threshold; if yes, go to step S23; if not, step S22 is repeated to compare the network quality information of the higher-level network type neighbor cell.
In step S23, the reselection system starts an untimed timer corresponding to the current priority network type and restarts each timer that is running at a lower priority than the current priority.
Here, the reselection system may simultaneously start and restart the current priority and timers lower than the current priority. Preferably, the reselection system starts an untimed timer corresponding to the current priority network type first, and then restarts each timer which is timing and is lower than the current priority.
Here, the restarting of each timer that is counting time means: and restarting the timer within the timeout period of the timer, so that the timer is restarted.
After the reselection system performs step S23, the reselection system repeatedly performs step S22 until all neighboring cells are compared, monitors the network type corresponding to the timer that is timed out first, determines the network type that is timed out first according to the monitored network type, and then performs step S3 in the first embodiment.
It should be noted that, as will be understood by those skilled in the art, the manner of determining whether each timer has expired may be determined collectively after polling all network types of neighboring cells for network quality information against corresponding thresholds. Alternatively, a high priority interrupt may be adopted, and when a timer sends out a timeout signal due to timeout, the reselection system forcibly interrupts the above loop step due to the timeout signal, and then executes step S3.
Taking a mobile terminal including a GSM communication module, a CDMA communication module, and an LTE communication module as an example, the reselection system described in this embodiment is built in the mobile terminal. When monitoring that the network quality information communicated with the current cell is lower than the preset threshold, the reselection system performs step S1, obtains the network quality information of the neighboring cells of the three network types, and performs the steps in this embodiment.
That is, the reselection system presets the priorities of the network types from low to high as GSM, CDMA, and LTE. The reselection system compares network quality information of adjacent cells of GSM with a preset GSM threshold; if the value is higher than the threshold, starting a timer T1 corresponding to the GSM, and continuing to compare the network quality information corresponding to the higher-level network type; if not, the network quality information corresponding to the higher-level network type is continuously compared.
Then, the reselection system continuously compares the network quality information of the adjacent cells of the CDMA with a preset CDMA threshold; if the value is higher than the threshold, starting a timer T2 corresponding to the CDMA, then restarting a timer T1 which is timing, and continuing to compare network quality information corresponding to the higher-level network type; if not, the network quality information corresponding to the higher-level network type is continuously compared.
Then, the reselection system continuously compares the network quality information of the adjacent cells of the LTE with a preset LTE threshold; if the threshold is still higher than or equal to the threshold, the timer T3 corresponding to the LTE is started first, and then the timers T1 and T2 that are counting time are restarted. If the timers are judged at the moment, and the timer T3 is determined to be overtime, the step S3 in the first embodiment is executed; if not, the network quality information of the adjacent cells of the three network types is obtained again, and the comparison is executed again. Continuing to reside in the current cell until the preset total timing duration of reselection is overtime; alternatively, if the timer of one of the network types expires, the reselection system performs step S3 in embodiment one.
In a preferred manner, the reselection system re-acquires the network quality information of each neighboring cell and performs the above steps S21-S23 when no timer timeout period is monitored.
Unlike the above example, during the comparison of the network quality information of each priority, the timer of the corresponding priority may be already running at the time. At this time, when the network quality information of each adjacent cell does not reach the corresponding preset threshold, the reselection system closes the timing of the timer which is timing and corresponds to the network type of the current adjacent cell, so that the timer is not timing any more. When the comparison result is higher than or equal to the corresponding threshold, the reselection system does not start the timer of the corresponding priority, but restarts each timer which is counting time and has lower priority than the current priority.
For example, when the reselection system first compares the network quality information of each of the GSM, CDMA, and LTE neighboring cells to the respective corresponding thresholds, timers T1, T2, and T3 are started. When the timers T1, T2, and T3 are not expired, the reselection system obtains the network quality information of the three neighboring cells, and performs the above steps S21-S23 again, and compares that the network quality information corresponding to GSM is still higher than the corresponding threshold, so as not to process the current timer T1. And continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, and closing the timing of the timer T2. And continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, not restarting the timer T3, but restarting the timer T1. If the timers are determined at this time, and the timer T3 is determined to be overtime, the reselection system takes the LTE type corresponding to the timer T3 as the reselected network type, and then performs step S3.
Referring to fig. 3, in order to prevent the reselection system from performing a reselection judgment too long, a further preferred embodiment is that the reselection system further includes: and a counter corresponding to each timer. And the reselection system indicates a counter corresponding to the timer to add 1 when the timer is started/restarted each time, and the timer corresponding to the counter is not restarted until the count value of the counter reaches a preset count threshold. In addition, the reselection system simultaneously turns off the counter each time the timer is turned off.
For example, when the reselection system first compares the network quality information of neighboring cells for GSM, CDMA, and LTE with the respective corresponding thresholds, timers T1, T2, and T3 are started, and corresponding counters D1, D2, and D3 are counted as 1. When the timers T1, T2, and T3 are not overtime, the reselection system acquires the network quality information of the three neighboring cells for the second time, and performs the above steps S21-S23 again, and compares that the network quality information corresponding to GSM is still higher than the corresponding threshold, so as not to process the current timer T1. And continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, closing the timing of the timer T2 and the counting of the counter D2. And continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, the timer T3 is not restarted, but the timer T1 is restarted and the count value of the counter D1 is increased by 1 to obtain a count value of 2. If no timer is overtime at this time, the reselection system acquires the network quality information of the three neighboring cells for the third time, and compares that the network quality information of the GSM neighboring cells is still higher than the corresponding threshold, and then the current timer T1 is not processed. And continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, not restarting the timer T3, and judging whether the count value 2 of the counter D1 exceeds the preset counting threshold, if so, not restarting the timer D1, otherwise, restarting the timer T1. If the timers are determined at this time, and the timer T3 is determined to be overtime, the reselection system takes the LTE type corresponding to the timer T3 as the reselected network type, and then performs step S3.
EXAMPLE III
As shown in fig. 4, the present invention provides a system for reselecting a cell. The reselection system 1 is installed in a mobile terminal. The mobile terminal comprises a plurality of communication modules, and each communication module is correspondingly accessed to a mobile network type (hereinafter referred to as network type). The communication module includes but is not limited to: a GSM communication module, an LTE communication module, a 3G communication module and the like. After the mobile terminal accesses the current cell, the reselection starting module 11 in the reselection system 1 detects the network quality information of the current cell at regular time.
For example, if the currently accessed cell is a GSM cell, the reselection start module 11 obtains RSSI (signal strength indicator) periodically during the idle state. And the reselection starting module 11 determines whether to reselect the cell according to the comparison between the RSSI and a preset RSSI threshold. When the reselection starting module 11 detects that the RSSI is less than or equal to the RSSI threshold, determining to reselect the cell; otherwise, the next time the timing is reached, the detection is performed again.
When it is monitored that the network quality information communicated with the current cell is reduced to a reselection threshold, the reselection starting module 11 acquires the network quality information communicated with each adjacent cell according to each network type which can be accessed.
Specifically, the reselection starting module 11 sends network quality test information corresponding to the network type through each communication module included in the mobile terminal, and after receiving the network quality test information, the neighboring cell feeds back the network quality test information. The reselection start module 11 obtains network quality information communicated with each neighboring cell.
The network quality information includes, but is not limited to, at least two of: RSSI, RSCP (received signal code power), RSRP (reference signal received power). The network quality information received by the GSM communication module is RSSI, the network quality information received by the 3G communication module (such as WCDMA) is RSCP, and the network quality information received by the LTE communication module is RSRP.
It should be noted that, as those skilled in the art should understand, the above-mentioned manner of obtaining the network quality information is only an example, a new communication module appears in the future, and the reselection starting module 11 obtains the corresponding network quality information according to a channel detection manner of the new communication module and the corresponding cell.
The reselection system 1 further comprises: a reselection module 12 and an access module 13.
The reselection starting module 11 is configured to compare, according to a preset priority ranking of each network type, whether network quality information of adjacent cells reaches a preset threshold corresponding to the network type one by one from a network type with a lowest priority in each adjacent cell, and start reselection timing, of which a comparison result is a network type that reaches the corresponding threshold, one by one until a network type that is the earliest time out of the reselection timing is determined.
Here, the priorities of the network types are exemplified from low to high as: 2G type, 3G type, 4G type. Wherein the 3G types include: CDMA, WCDMA, TD-CDMA, etc. The 2G types include: GSM. The 4G types include: LTE.
It should be noted that those skilled in the art should understand that the above network types are only examples, and that the reselection module 12 may be configured to re-adjust the priority of each network type according to actual needs when new network types appear in the future.
Here, each reselection time period may be performed by a timer corresponding to a network type. Different reselection time lengths can be preset in each timer. And the reselection time length corresponding to the high-priority network type is not more than the reselection time length corresponding to the low-priority network type. In a preferred mode, for two reselection durations corresponding to adjacent priorities, the reselection duration corresponding to the low priority is greater than the sum of the reselection duration corresponding to the high priority and the duration of the step of determining the network quality information.
Here, the reselection timing timeout refers to a time-out stopping due to a timer starting and counting the reselection time.
Specifically, after receiving the network quality information fed back by each neighboring cell, the reselection module 12 is capable of determining the network type of each neighboring cell that can currently communicate with. The reselection module 12 further sets a reselection timer for each network type, and each reselection timer may start reselection timing at the time set by the reselection module 12.
For example, the low-to-high priority order preset by the reselection module 12 is: GSM and CDMA. Starting from the network type with the lowest priority in each neighboring cell, the reselection module 12 first compares whether the network quality information of the neighboring cell based on the GSM reaches a preset GSM threshold; if not, continuously comparing whether the network quality of the adjacent cell based on the CDMA reaches the preset threshold of the CDMA.
Then, when the reselection module 12 determines that the network quality of the neighboring CDMA-based cell is lower than a preset threshold of CDMA, it determines that none of the neighboring cells is suitable for access, and continues to camp on the current cell.
For another example, if the reselection module 12 determines that the network quality information of the neighboring cell based on GSM reaches the preset GSM threshold, the timer T1 corresponding to GSM is started to start reselection timing, and then the network quality of the neighboring cell based on CDMA is continuously compared to determine whether the network quality information of the neighboring cell based on GSM reaches the preset CDMA threshold.
When the reselection module 12 determines that the network quality of the neighboring cell based on CDMA is higher than or equal to a preset CDMA threshold, a timer T2 corresponding to CDMA is started to start reselection timing, and two timers are waited to be overtime, in this case, the timer T2 will be overtime first because the reselection time of the timer T2 is less than the reselection time of the timer T1, and the reselection module 12 determines that the network type is CDMA, and executes the access module 13.
In a preferred embodiment, before the reselection module 12 waits for the timing of the two timers to end, the reselection module 12 repeatedly obtains the network quality information of each neighboring cell, and compares, starting from the network type with the lowest priority, whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type one by one, and closes, one by one, the reselection timing corresponding to the network type whose comparison result is that the network type does not reach the corresponding threshold.
Still taking the above reselection schemes of the CDMA neighboring cell and the GSM neighboring cell as an example, if the reselection module 12 determines that the network quality information of both the CDMA-based neighboring cell and the GSM-based neighboring cell is always higher than or equal to the respective corresponding thresholds, since the reselection time corresponding to the CDMA is smaller than the reselection time corresponding to the GSM, it means that the timer corresponding to the CDMA is earlier than the timer corresponding to the GSM, and the reselection module 12 determines that the network type corresponding to the timer which is the earliest time-out is CDMA, and executes the access module 13.
If the network quality information of the neighboring cell based on GSM is always higher than or equal to the corresponding threshold and the network quality information of the neighboring cell based on CDMA is lower than the corresponding threshold, which means that the timer corresponding to CDMA is closed in advance before timeout occurs, the timer corresponding to GSM must be timed out first, the reselection module 12 determines that the network type corresponding to the timer which is timed out first is GSM, and executes the access module 13.
The access module 13 is configured to select, according to the determined network type, an adjacent cell corresponding to the determined network type for access.
The access module 13 may issue an access request to a corresponding neighboring cell according to the determined network type to perform an access procedure with the neighboring cell.
Here, performing the access procedure with the neighboring cell is prior art and will not be described in detail here.
Example four
In contrast to the third embodiment, the complexity of the reselection system 1 improvement is reduced for downward compatibility. A plurality of timers for timing fixed time duration are preset in the reselection system 1. Each timer corresponds to a network type. The reselection module 12 includes: the first comparison submodule and the second comparison submodule. None of which are shown.
The first comparison sub-module is used for comparing the network quality information corresponding to the network type with the lowest priority in the adjacent cells with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting a corresponding untimed timer, and executing a second comparison submodule; and if not, executing a second comparison submodule.
Herein, the untimed timer means that the timer is not running yet. At this point the timer may never be started or have stopped timing due to a condition.
Here, the timer that is counting time means that the timer has started reselection timing under the current condition and has not timed out yet. The timing mode of closing the timer in timing is as follows: the first comparison submodule stops the timer that is timing.
The second comparison submodule is used for comparing network quality information corresponding to the network type with the higher priority in the adjacent cell with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting an untimed timer corresponding to the current priority network type, and restarting each timer which is lower than the current priority and is timing; if not, the second comparison sub-module is repeatedly executed to compare the network quality information of the higher-level network type adjacent cell.
Here, the second comparison submodule may start and restart the current priority and timers lower than the current priority at the same time. Preferably, the second comparing sub-module starts an untimed timer corresponding to the current priority network type first, and then restarts each timer which is timing and has a lower priority than the current priority.
Here, the restarting of each timer that is counting time means: and restarting the timer within the timeout period of the timer, so that the timer is restarted.
The second comparing sub-module monitors the network type corresponding to the timer whose timing is timed out first until all the adjacent cells are compared, determines the network type whose timing is timed out first from the monitored network type, and then executes the access module 13 in the third embodiment.
It should be noted that, as will be understood by those skilled in the art, the second comparing sub-module may determine whether each timer has expired or not by collectively determining after polling all network types and comparing the network quality information of the neighboring cells with the corresponding thresholds. Or, a high priority interrupt mode may be adopted, and when a timer sends an overtime signal due to timeout, the second comparing submodule forcibly interrupts the above-mentioned cycle step due to the overtime signal, and executes the access module 13.
Taking a mobile terminal including a GSM communication module, a CDMA communication module, and an LTE communication module as an example, the reselection system 1 according to this embodiment is built in the mobile terminal. When it is monitored that the network quality information communicated with the current cell is lower than the preset threshold, the reselection starting module 11 obtains the network quality information of the neighboring cells of the three network types, and executes the reselection module 12 in this embodiment.
That is, the priority of each network type is preset by the first comparison sub-module to be GSM, CDMA, LTE from low to high. The first comparison sub-module compares the network quality information of the adjacent cells of the GSM with a preset GSM threshold; if the value is higher than the threshold, starting a timer T1 corresponding to the GSM, and submitting the timer T1 to the second comparison submodule to continue comparing the network quality information corresponding to the higher-level network type; if not, the second comparison sub-module continues to compare the network quality information corresponding to the higher-level network type.
Then, the second comparison sub-module continuously compares the network quality information of the adjacent cell of the CDMA with a preset CDMA threshold; if the value is higher than the threshold, starting a timer T2 corresponding to the CDMA, then restarting a timer T1 which is timing, and continuing to compare network quality information corresponding to the higher-level network type; if not, the network quality information corresponding to the higher-level network type is continuously compared.
Then, the second comparison submodule continuously compares the network quality information of the adjacent cell of the LTE with a preset LTE threshold; if the threshold is still higher than or equal to the threshold, the timer T3 corresponding to the LTE is started first, and then the timers T1 and T2 that are counting time are restarted. If the timers are judged at the moment, and the timer T3 is determined to be overtime, the step S3 in the third embodiment is executed; if not, the network quality information of the adjacent cells of the three network types is obtained again, and the comparison is executed again. Continuing to reside in the current cell until the preset total timing duration of reselection is overtime; or, when a timer of one of the network types is expired, the access module 13 in the third embodiment is executed.
In a preferred manner, the second comparing sub-module instructs the reselection initiating module 11 to reacquire the network quality information of each neighboring cell when no timer timeout period is monitored.
Unlike the above example, during the time when the reselection module 12 compares the network quality information of each priority, the timer of the corresponding priority may be running. At this time, when the network quality information of each neighboring cell does not reach the corresponding preset threshold, the reselection module 12 closes the timing of the timer that is timing and corresponds to the network type of the current neighboring cell, so that the timer does not count any more. When the comparison result is higher than or equal to the corresponding threshold, the reselection module 12 does not start the timer of the corresponding priority, but restarts each timer that is counting time and has a lower priority than the current priority.
For example, when the first comparison submodule and the second comparison submodule in the reselection module 12 compare the network quality information of neighboring cells of GSM, CDMA, and LTE with the corresponding thresholds for the first time, the timers T1, T2, and T3 are started. During the time that none of the timers T1, T2, and T3 has timed out, the reselection start module 11 obtains the network quality information of the three neighboring cells again, and delivers the network quality information to the first comparison sub-module and the second comparison sub-module to compare again that the network quality information corresponding to GSM is still higher than the corresponding threshold, so as not to process the current timer T1. And continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, and closing the timing of the timer T2. And continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, not restarting the timer T3, but restarting the timer T1. If the respective timer is determined at this time, it is determined that the timer T3 is overtime, and the second comparing sub-module takes the LTE type corresponding to the timer T3 as the reselected network type, and executes the access module 13.
Refer to fig. 3. In another preferred embodiment, in order to prevent the reselection module 12 from performing the reselection judgment too long, the reselection system 1 further includes: and a counter corresponding to each timer. The reselection module 12 indicates the counter corresponding to the timer to add 1 when starting/restarting the timer each time, until the count value of the counter reaches a preset count threshold, the timer corresponding to the counter is not restarted. In addition, the first comparison submodule and the second comparison submodule in the reselection module 12 simultaneously turn off the counting of the counter each time the timer is turned off.
For example, when the first comparison submodule and the second comparison submodule compare the network quality information of each neighboring cell of GSM, CDMA, and LTE with the corresponding threshold for the first time, the timers T1, T2, and T3 are started, and the corresponding counters D1, D2, and D3 are counted to 1. When the timers T1, T2, and T3 are not overtime, the reselection start module 11 obtains the network quality information of the three neighboring cells for the second time, and executes the first comparison sub-module and the second comparison sub-module again, and determines that the network quality information corresponding to GSM is still higher than the corresponding threshold, then the current timer T1 is not processed; and continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, closing the timing of the timer T2 and the counting of the counter D2. And continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, the timer T3 is not restarted, but the timer T1 is restarted and the count value of the counter D1 is increased by 1 to obtain a count value of 2. If no timer is overtime at this time, the reselection starting module 11 obtains the network quality information of the three neighboring cells for the third time, and the first comparison sub-module and the second comparison sub-module compare that the network quality information of the GSM neighboring cells is still higher than the corresponding threshold, and then the current timer T1 is not processed; and continuing to compare and determine that the network quality information corresponding to the newly acquired CDMA is lower than the corresponding threshold, continuing to compare and determine that the network quality information corresponding to the newly acquired LTE is higher than the corresponding threshold, not restarting the timer T3, and judging whether the count value 2 of the counter D1 exceeds the preset counting threshold, if so, not restarting the timer D1, otherwise, restarting the timer T1. If the second comparing sub-module determines that the timer T3 is out of time, the second comparing sub-module takes the LTE type corresponding to the timer T3 as the reselected network type, and executes the access module 13.
In summary, the invention sets reselection timings with different reselection durations for network types of different priorities, thereby effectively solving the problem that a plurality of network types cannot select a cell with high priority or always reside in a cell with high priority and low network quality during reselection; in addition, the equal-time-length timers are adopted, and when the network quality of the high-priority adjacent cell is higher than the corresponding threshold, the timers with low priority and timing are restarted, so that the restarting time length of low priority can be fully prolonged, and time delay is provided for reselecting the high-priority adjacent cell; meanwhile, when the quality of the high-priority cell is not good, the probability that the adjacent cell with low priority is selected is increased; in addition, during the time that each timer is not overtime, the times of reselection judgment are increased, and the selected adjacent cells can be ensured to provide stable network communication; in addition, in order to prevent the reselection judgment from being performed too long, the invention also adopts a counter counting mode to limit the restarting times of the timer. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A method for reselecting a cell for a mobile terminal having access to a plurality of mobile network types, comprising:
when the monitored network quality information communicated with the current cell is reduced to a reselection threshold, acquiring the network quality information communicated with each adjacent cell according to each network type which can be accessed;
according to the preset priority sequence of each network type, starting from the network type with the lowest priority in each adjacent cell, comparing whether the network quality information of the adjacent cells reaches a preset threshold corresponding to the network type one by one, and starting reselection timing corresponding to the network type with the comparison result reaching the corresponding threshold one by one until the network type with the earliest overtime in the reselection timing is determined; wherein the reselection time length corresponding to the high-priority network type is not greater than the reselection time length corresponding to the low-priority network type;
selecting an adjacent cell corresponding to the determined network type according to the determined network type;
further comprising: before the reselection timing is not monitored to be overtime, the network quality information of each adjacent cell is repeatedly acquired, whether the network quality information of the adjacent cells reaches a preset threshold corresponding to the network type is compared one by one from the network type with the lowest priority, and the reselection timing corresponding to the network type with the comparison result that the network quality information of the adjacent cells does not reach the corresponding threshold is closed one by one.
2. The method of reselecting a cell according to claim 1, wherein the manner of comparing the network quality information of the neighboring cells one by one to determine whether the network quality information reaches a preset threshold corresponding to the network type, and starting the reselection timing corresponding to the network type with the comparison result reaching the corresponding threshold one by one comprises:
presetting a plurality of timers for timing fixed time duration, wherein each timer corresponds to a network type;
1) comparing the network quality information corresponding to the network type with the lowest priority in the adjacent cells with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting a corresponding untimed timer, and executing the step 2); if not, executing the step 2);
2) comparing network quality information corresponding to the network type with the higher priority in the adjacent cell with whether the network quality information reaches a corresponding preset threshold or not; if yes, executing step 3); if not, repeatedly executing the step 2);
3) starting an untimed timer corresponding to the current priority network type and restarting each timer which is timing and is lower than the current priority; and (5) repeatedly executing the step 2) until all the adjacent cells are compared, monitoring the network type corresponding to the timer with the first overtime timing, and determining the network type with the first overtime reselection timing according to the monitored network type.
3. The method of reselecting a cell according to claim 2, further comprising, during a time period when each of the monitored timers has not expired:
re-acquiring the network quality information of each adjacent cell;
repeating steps 1) -3); and when the network quality information of each adjacent cell does not reach the corresponding preset threshold, closing the timing of the timer which is timing and corresponds to the network type of the current adjacent cell.
4. The method of reselecting a cell according to claim 3, further comprising: counters corresponding to the timers;
when the timer is started/restarted each time, indicating a counter corresponding to the timer to add 1 until the count value of the counter reaches a preset count threshold, and stopping restarting the timer corresponding to the counter;
at each time the timer is turned off, the counter is turned off at the same time.
5. A system for reselecting a cell for a mobile terminal having access to a plurality of mobile network types, comprising:
the reselection starting module is used for acquiring the network quality information communicated with each adjacent cell according to each network type which can be accessed when the monitored network quality information communicated with the current cell is reduced to a reselection threshold;
a reselection module, configured to compare, one by one, whether network quality information of neighboring cells reaches a preset threshold corresponding to a network type from a network type with a lowest priority in neighboring cells according to a preset priority ranking of each network type, and start a reselection timer, whose comparison result is a network type that reaches the corresponding threshold, one by one, until determining a network type that is the earliest overtime in the reselection timer; wherein the reselection time length corresponding to the high-priority network type is not greater than the reselection time length corresponding to the low-priority network type;
the access module is used for selecting and accessing the adjacent cell corresponding to the determined network type according to the determined network type;
further comprising: before the reselection timing is not monitored to be overtime, the reselection module is further configured to instruct the reselection starting module to repeatedly acquire the network quality information of each neighboring cell, compare whether the network quality information of the neighboring cells reaches a preset threshold corresponding to the network type one by one from the network type with the lowest priority, and close the reselection timing corresponding to the network type whose comparison result is that the network type does not reach the corresponding threshold one by one.
6. The system for reselecting a cell according to claim 5, wherein a plurality of timers for timing a fixed time duration are preset in the reselection module, and each timer corresponds to a network type; the reselection module comprises:
the first comparison sub-module is used for comparing the network quality information corresponding to the network type with the lowest priority in the adjacent cells with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting a corresponding untimed timer, and executing a second comparison submodule; if not, executing a second comparison submodule;
the second comparison submodule is used for comparing network quality information corresponding to the network type with the higher priority in the adjacent cell with whether the network quality information reaches a corresponding preset threshold or not; if yes, starting an untimed timer corresponding to the current priority network type, restarting each timer which is lower than the current priority and timing, and repeatedly executing the second comparison sub-module; if not, the second comparison submodule is executed repeatedly;
and until all the adjacent cells are compared, the second comparison submodule is also used for determining the network type corresponding to the timer with the first overtime timing and determining the network type with the first overtime reselection timing according to the monitored network type.
7. The system for reselecting a cell according to claim 6, wherein the second comparing sub-module is further configured to instruct the reselection initiating module to reacquire the network quality information of each neighboring cell during a period when none of the monitored timers has expired;
the first comparison submodule and the second comparison submodule are also used for closing the timing of the timing timer corresponding to the network type of the current adjacent cell when the network quality information of each adjacent cell does not reach the corresponding preset threshold.
8. The system for reselecting a cell according to claim 7, further comprising: counters corresponding to the timers;
the second comparison submodule is also used for indicating a counter corresponding to the timer to add 1 when the timer is started/restarted each time until the count value of the counter reaches a preset count threshold, and the timer corresponding to the counter is not restarted any more;
the first and second comparison sub-modules are further configured to simultaneously turn off the counter each time the timer counts.
9. A mobile terminal, comprising: a system for reselecting a cell according to any one of claims 5-8.
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| CN114190114B (en) * | 2020-07-13 | 2023-10-20 | 华为技术有限公司 | Cell reselection method and related communication equipment |
| CN114258110B (en) * | 2020-09-22 | 2024-02-06 | 紫光展锐(重庆)科技有限公司 | Control method and device for triggering reconstruction, storage medium and terminal |
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