CN107404746B - Reselection optimization system and method after random access cell failure - Google Patents
Reselection optimization system and method after random access cell failure Download PDFInfo
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- CN107404746B CN107404746B CN201710743689.0A CN201710743689A CN107404746B CN 107404746 B CN107404746 B CN 107404746B CN 201710743689 A CN201710743689 A CN 201710743689A CN 107404746 B CN107404746 B CN 107404746B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention relates to a reselection optimization system and method after random access cell failure, comprising: s1, when the user terminal has accessed and resided in the first cell, the access prejudgment module prejudges whether the user terminal and the second cell meet the access criterion; s2, when the user terminal and the second cell are judged to meet the access reselection criterion, the timing module sets a time threshold value for the second cell for allowing access; s3, after the time threshold is reached, the user terminal sends the request of random access to the second cell through the access request module, and the timing module updates the time threshold according to the request result. The invention can solve the problem that the user terminal repeatedly initiates random access to the cell and causes frequent offline, thereby effectively improving the user experience.
Description
Technical Field
The invention relates to a system and a method for randomly accessing a cell, in particular to a reselection optimization system and a reselection optimization method for an intelligent mobile terminal after the random access of the cell fails, and belongs to the technical field of communication.
Background
Currently, a Random Access (Random Access) procedure refers to a procedure from a User Equipment (UE) sending a Random Access preamble to attempting to Access a PLMN network to establishing a basic signaling connection with the PLMN network. The PLMN Network refers to a Public Land Mobile Network (Public Land Mobile Network), which is established and operated by the government or an authorized operator thereof for the purpose of providing a Land Mobile communication service to the Public. The user of the PLMN network needs to use the mobile terminal to realize the connection with the base station through wireless signals, and finally realizes the convenient communication in the moving process through the switch in the network.
Random access is a very critical step in mobile communications, and is also the last step for a user terminal to establish a communication link with a cell base station. The user terminal can achieve the purpose of information interaction with the cell base station through random access, and complete the following operations: communication steps such as calling, resource request, data transmission, etc.; and the user terminal can realize uplink time synchronization with the cell base station through random access. Therefore, the performance of random access will directly affect the user experience.
As shown in fig. 1, a flow chart of a prior art user terminal randomly accessing to a network includes the following steps:
s1, the user terminal sends a lead code requesting random access to the cell base station;
s2, after receiving the lead code, the cell base station sends response information of random access to the user terminal;
s3, after receiving the response message, the ue sends an RRC (Radio Resource Control) connection request to the cell bs;
s4, after receiving the RRC connection request, the cell base station establishes communication connection with the user terminal.
For a particular user terminal, several different types of PLMNs are typically maintained, including:
RPLMN (Registered PLMN), which is a PLMN to which the user terminal is Registered before the last power-off or network disconnection. The parameters are stored in the memory of the user terminal according to the decision of TSG TP-21 meeting in 3GPP 2003.
The EPLMN (Equivalent PLMN) is a PLMN that is located at the same level as the PLMN currently selected by the user terminal for access, and has the same priority.
The EHPLMN (Equivalent Home PLMN) is a Home PLMN that is located at the same position as the PLMN currently selected by the user terminal for access. The method comprises the following steps: the EHPLMN and EPLMN are as if they are mobile new 158 networks, while the PLMN is as if it is a native 135-139 network.
The HPLMN (Home PLMN) is a PLMN to which the user terminal belongs.
VPLMN (Visited PLMN) is a PLMN Visited by the user terminal.
FPLMN (Forbidden PLMN), which is a PLMN that the user terminal is prohibited from accessing, is usually set as FPLMN after the user terminal is rejected to try to access a certain PLMN.
An APLMN (adaptive PLMN, captive PLMN) is a PLMN on which a user terminal can find at least one cell and can read PLMN identification information thereof.
In the prior art, when a user terminal initiates a random access request to a cell a, it is likely that a response of denying access by the cell a is received, which may cause the user terminal to disconnect from the network, trigger a PLMN to re-search for other cells meeting a camping criterion, and finally cause the user terminal to camp on other choices. Although the random access of the user terminal to the cell a fails, the user terminal may initiate a random access request to the cell a again, and if the cell a reselects the parameter configuration at this time, the situation that the user terminal frequently goes offline is easily triggered, and the user experience is seriously affected.
In the current 3GPP protocol, it is not explicitly specified that when the ue requests the random access cell and is rejected to cause access failure, any special optimization process needs to be performed in the subsequent cell reselection process for the cell, so that the ue will repeatedly initiate the random access to the cell and cause frequent offline.
Based on the foregoing, there is a need to provide a reselection optimization system and method after a random access cell fails, which effectively solve the problems and limitations in the prior art to improve user experience.
Disclosure of Invention
The invention aims to provide a reselection optimization system and method after a random access cell fails, which can solve the problem that frequent offline occurs due to the fact that a user terminal repeatedly initiates random access to the cell, and effectively improve user experience.
In order to achieve the above object, the present invention provides a reselection optimization system for a failed random access cell, comprising: the access pre-judging module is used for pre-judging whether the user terminal and the second cell meet the access criterion when the user terminal is currently accessed to and resides in the first cell; the timing module is connected with the access pre-judging module and sets a time threshold value for allowing access for the second cell when judging that the user terminal and the second cell meet the access reselection criterion; and the access request module is connected with the timing module, after the time threshold is reached, the user terminal initiates a request of random access to the second cell through the access request module, and the timing module updates the time threshold according to the request result.
The timing module comprises: the counter is connected with the access request module and records the failure times of the user terminal initiating the random access request to the second cell; a time threshold updating unit connected with the counter and resetting the time threshold according to the failure times of the user terminal initiating the random access request to the second cell; and the timer is connected with the time threshold updating unit and is used for timing the request of the user terminal for initiating the random access to the second cell according to the latest time threshold.
The time threshold updating unit sets the time threshold to be linearly increased or exponentially increased along with the increase of the failure times of the user terminal to initiate the random access request to the second cell.
The access anticipation module comprises: the adjacent cell pre-judging unit is connected with the time threshold updating unit, and when the second cell is judged to be not the adjacent cell of the first cell, the time threshold updating unit sets the time threshold to zero; the PLMN prejudging unit is connected with the time threshold updating unit, and when the first cell is judged to belong to a new PLMN and the new PLMN does not belong to the EPLMN of the original PLMN, the time threshold updating unit sets the time threshold to zero; and the restart prejudging unit is connected with the time threshold updating unit, and when the user terminal is judged to be restarted or the SIM card is replaced, the time threshold updating unit sets the time threshold to zero.
The access request module comprises: a lead code sending unit, by which the user terminal sends a lead code requesting random access to the second cell; the response unit is connected with the lead code sending unit, and the second cell sends response information of random access to the user terminal through the response unit; the RRC request unit is connected with the response unit, and the user terminal sends an RRC connection request to the second cell through the RRC request unit; the access feedback unit is respectively connected with the RRC request unit and the counter, when the user terminal is fed back to be successfully accessed into the second cell, the counter sets the failure times of the user terminal initiating the random access request to the second cell to zero, and the time threshold updating unit sets the time threshold to zero; when the user terminal is fed back to be unsuccessfully accessed to the second cell, the counter updates the failure times of the user terminal initiating the random access request to the second cell, and the time threshold value updating unit resets the time threshold value.
The invention also provides a reselection optimization method after the random access cell fails, which is realized by adopting the reselection optimization system and comprises the following steps:
s1, when the user terminal has accessed and resided in the first cell, the access prejudgment module prejudges whether the user terminal and the second cell meet the access criterion;
s2, when the user terminal and the second cell are judged to meet the access reselection criterion, the timing module sets a time threshold value for the second cell for allowing access;
s3, after the time threshold is reached, the user terminal sends the request of random access to the second cell through the access request module, and the timing module updates the time threshold according to the request result.
The step S1 specifically includes the following steps:
s11, the adjacent cell prejudging unit judges whether the second cell is the adjacent cell of the first cell; if yes, proceed to S12; if not, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
s12, the PLMN prejudging unit judges whether the first cell belongs to a new PLMN or not and whether the new PLMN belongs to the EPLMN of the original PLMN or not; if not, continue to execute S13; if so, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
s13, the restart prejudging unit judges whether the user terminal restarts or whether the SIM card is replaced; if not, continue to execute S2; if so, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal.
The step S2 specifically includes the following steps:
s21, the timer times the request of the user terminal for initiating the random access to the second cell according to the time threshold; during the period, the user terminal needs to initiate a random access request to other cells meeting the reselection criterion;
and S22, after the time threshold is reached, the user terminal selects the second cell as the object for initiating the random access request again according to the reselection rule.
The step S3 specifically includes the following steps:
s31, the user terminal sends a lead code requesting random access to the second cell through the lead code sending unit;
s32, the second cell sends the response information of random access to the user terminal through the response unit;
s33, the user terminal sends RRC connection request to the second cell through the RRC request unit;
s34, the access feedback unit feeds back the result of the random access;
when the user terminal is successfully accessed into the second cell, the counter sets the failure times of the user terminal initiating the random access request to the second cell to zero, so that the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
when the user terminal is not successfully accessed to the second cell, the counter updates the failure times of the user terminal initiating the random access request to the second cell, so that the time threshold updating unit resets the time threshold and the user terminal still stays in the first cell.
In S34, the time threshold updating unit sets the time threshold to linearly increase or exponentially increase with the number of times of failure of the ue to initiate the random access request to the second cell.
In summary, the reselection optimization system and method for the failed random access cell provided by the present invention, by setting the time threshold for the cell which once requested to have access failure, ensures that the user terminal does not initiate a random access request to the cell until the time threshold is reached, thereby solving the problem that the user terminal repeatedly initiates random access to the cell and causes frequent network disconnection, and effectively improving user experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a flow chart of a ue randomly accessing a network in the prior art;
fig. 2 is a schematic structural diagram of a reselection optimization system after a random access cell fails in the present invention;
FIG. 3 is a schematic diagram of a timing module according to the present invention;
fig. 4 is a schematic structural diagram of an access anticipation module in the present invention;
FIG. 5 is a schematic structural diagram of an access request module according to the present invention;
fig. 6 is a basic flowchart of a reselection optimization method after a random access cell fails in the present invention;
fig. 7 is a flowchart of determining whether the ue and the second cell meet the access criteria in the present invention;
fig. 8 is a detailed flowchart of a reselection optimization method after a random access cell fails in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
It is noted that, in this document, relational terms such as "first," "second," "third," and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
The technical solution of the present invention will be described in detail with reference to fig. 2 to 8 as specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
As shown in fig. 2, the reselection optimization system for a failed random access cell according to the present invention is a connection communication system between a user equipment and a cell network, and includes: an access pre-judging module 1, which is used for pre-judging whether the user terminal and the second cell meet the access criterion when the user terminal is currently accessed and resided in the first cell; the timing module 2 is connected with the access pre-judging module 1, and sets a time threshold value for allowing access for the second cell when the user terminal and the second cell are judged to meet the access reselection criterion, namely the user terminal is not allowed to initiate a random access request to the second cell when the time threshold value is not reached; and the access request module 3 is connected with the timing module 2, after the time threshold is reached, the user terminal initiates a request of random access to the second cell through the access request module 3, and the timing module 2 updates the time threshold according to the request result.
As shown in fig. 3, the timing module 2 includes: the counter 21 is connected with the access request module 3 and records the failure times of the user terminal initiating the random access request to the second cell; a time threshold updating unit 22, connected to the counter 21, for resetting the time threshold according to the number of failures of the ue to initiate a random access request to the second cell; and the timer 23 is connected to the time threshold updating unit 22, and performs timing for the request of the user terminal for initiating the random access to the second cell according to the latest time threshold, that is, when the time threshold is not reached, the user terminal is not allowed to initiate the request of the random access to the second cell.
In a preferred embodiment of the invention, the time threshold is set to TcellAnd 0 < Tcell≤TmaxWherein, TmaxIndicating a set maximum time threshold.
Further, the time threshold updating unit 22 sets the time threshold TcellThe number of times of failure N of the user terminal to initiate the random access request to the second cell increases linearly, that is, when the number of times of failure N of the random access request increases gradually, each time the time threshold updating unit 22 updates TcellIs increased by the same time interval t. For example, when the number of failures of the user terminal to initiate the random access request to the second cell is increased from 1 to 2, let T becell＝Tcell+ t; when the number of failure times of the user terminal to initiate the random access request to the second cell is increased from 4 times to 5 times, the T is still enabledcell＝Tcell+t。
Alternatively, the time threshold updating unit 22 sets the time threshold TcellThe number of times of failure N of the user terminal to initiate the random access request to the second cell increases exponentially, that is, when the number of times of failure N of the random access request increases gradually, each time the time threshold updating unit 22 updates TcellIs increased by a different time interval tN. For example, when the number of failures of the user terminal to initiate the random access request to the second cell is increased from 0 to 1, let T becell＝Tcell+ t; when the user terminal initiates the random access request to the second cell, the number of times of failure is determined byIncreasing T from 1 to 2 timescell＝Tcell+t2(ii) a And when the failure times of the user terminal to initiate the random access request to the second cell is increased from 4 times to 5 times, making Tcell＝Tcell+t5。
Of course, in other preferred embodiments of the present invention, the time threshold T is setcellThe number N of failures of the ue to initiate the random access request to the second cell may be increased according to any other setting.
As shown in fig. 4, the access pre-judging module 1 includes a neighboring cell pre-judging unit 11, connected to the time threshold updating unit 22, and configured to determine whether the second cell is a neighboring cell of the first cell; and the time threshold updating unit 22 sets the time threshold to zero when it is determined that the second cell is not the neighbor of the first cell.
As shown in fig. 4, the access prejudging module 1 further includes a PLMN prejudging unit 12, connected to the time threshold updating unit 22, for judging whether the first cell belongs to a new PLMN, and whether the new PLMN belongs to an EPLMN (equivalent PLMN) of the original PLMN; and when the first cell is judged to belong to the new PLMN and the new PLMN does not belong to the EPLMN of the original PLMN, the time threshold updating unit 22 sets the time threshold to zero.
As shown in fig. 4, the access pre-judging module 1 further includes a restart pre-judging unit 13, connected to the time threshold updating unit 22, for judging whether the user terminal is restarted or whether the SIM card is replaced; and when it is determined that the user terminal restarts or changes the SIM card, the time threshold updating unit 22 sets the time threshold to zero.
As shown in fig. 5, the access request module 3 includes: a preamble transmission unit 31, by which the user terminal transmits a preamble requesting random access to the second cell through the preamble transmission unit 31; a response unit 32 connected to the preamble transmission unit 31, wherein the second cell transmits response information of random access to the user terminal through the response unit 32; the RRC requesting unit 33 is connected to the responding unit 32, and the user terminal transmits an RRC connection request to the second cell through the RRC requesting unit 33.
Further, the access request module 3 further includes: an access feedback unit 34, respectively connected to the RRC requesting unit 33 and the counter 21, wherein when the user terminal is fed back to successfully access the second cell, the counter 21 sets the number of failures of the user terminal to initiate a random access request to the second cell to zero, and the time threshold updating unit 22 sets the time threshold to zero; when it is fed back that the ue fails to access the second cell, the counter 21 updates the number of failures of the ue to initiate a random access request to the second cell, and the time threshold updating unit 22 resets the time threshold.
According to the above, in the reselection optimization system after the random access cell fails, the following conditions exist for setting the time threshold to zero:
1. when a cell (a second cell) which a user terminal wants to initiate a random access request is no longer a neighboring cell of a cell (a first cell) which the user terminal has currently accessed and resided in;
2. when a cell (a first cell) which is accessed and resided by a user terminal currently belongs to a new PLMN, and the new PLMN is not an EPLMN of an original PLMN;
3. when the user terminal is restarted, or the SIM card is replaced;
4. after the user terminal has initiated a request for random access to the second cell and successfully camps on it.
As shown in fig. 6, the present invention further provides a reselection optimization method after a random access cell fails, which is implemented by using the reselection optimization system described above, and includes the following steps:
s1, when the user terminal has accessed and resided in the first cell, the access prejudgment module 1 prejudges whether the user terminal and the second cell meet the access criterion;
s2, when it is determined that the ue and the second cell satisfy the access reselection criterion, the timing module 2 sets a time threshold for allowing access for the second cell, that is, when the time threshold is not reached, the ue is not allowed to initiate a random access request to the second cell;
s3, after the time threshold is reached, the ue initiates a request for random access to the second cell through the access request module 3, and the timing module 2 updates the time threshold according to the request result.
As shown in fig. 7, the step S1 specifically includes the following steps:
s11, the neighboring cell pre-judging unit 11 judges whether the second cell is a neighboring cell of the first cell; if yes, proceed to S12; if not, the time threshold updating unit 22 sets the time threshold to zero, and clears the second cell information stored in the user terminal;
s12, the PLMN prejudging unit 12 judges whether the first cell belongs to a new PLMN, and whether the new PLMN belongs to an EPLMN (equivalent PLMN) of the original PLMN; if not, continue to execute S13; if so, the time threshold updating unit 22 sets the time threshold to zero, and clears the second cell information stored in the user terminal;
s13, the restart prejudging unit 13 judges whether the user terminal restarts or whether the SIM card is replaced; if not, continue to execute S2; if so, the time threshold updating unit 22 sets the time threshold to zero, and clears the second cell information stored in the user terminal.
As shown in fig. 8, the step S2 specifically includes the following steps:
s21, the timer 23, according to the time threshold, times the request for the user terminal to initiate random access to the second cell, that is, when the time threshold is not reached, the user terminal is not allowed to initiate the request for random access to the second cell; during the period, the user terminal needs to initiate a random access request to other cells meeting the reselection criterion;
and S22, after the time threshold is reached, the user terminal selects the second cell as the object for initiating the random access request again according to the reselection rule.
It should be noted that, if the first cell that the user terminal has currently accessed and successfully resided in no longer satisfies the residence criterion, and it is found after reselection that the second cell is the only cell that currently satisfies the reselection criterion, or all other cells that satisfy the reselection criterion are all limited by the corresponding time threshold, so that the current user terminal cannot select any cell to initiate an access request, then the current user terminal will not be limited by the time threshold specifically set by the present invention, and a random access request is initiated after reselecting a cell according to the normal reselection rule.
As shown in fig. 8, the step S3 specifically includes the following steps:
s31, the ue sends a preamble requesting random access to the second cell through the preamble sending unit 31;
s32, the second cell sends response information of random access to the user equipment through the response unit 32;
s33, the ue sends an RRC connection request to the second cell through the RRC requesting unit 33;
s34, the access feedback unit 34 feeds back the result of the random access;
when the access feedback unit 34 feeds back that the user terminal successfully accesses the second cell, the counter 21 sets the number of failure times of the user terminal initiating the random access request to the second cell to zero, so that the time threshold updating unit 22 sets the time threshold to zero, and clears the second cell information stored in the user terminal;
when the access feedback unit 34 feeds back that the ue fails to access the second cell, the counter 21 updates the number of failures of the ue to initiate a random access request to the second cell, so that the time threshold updating unit 22 resets the time threshold and the ue remains camped on the first cell.
In a preferred embodiment of the invention, the time threshold is set to TcellAnd 0 < Tcell≤TmaxWherein, TmaxIndicating a set maximum time threshold.
Further, the time threshold updating unit 22 sets the time threshold TcellThe number of times of failure N of the user terminal to initiate the random access request to the second cell increases linearly, that is, when the number of times of failure N of the random access request increases gradually, each time the time threshold updating unit 22 updates TcellIs increased by the same time interval t. For example, when the number of failures of the user terminal to initiate the random access request to the second cell is increased from 1 to 2, let T becell＝Tcell+ t; when the user terminal is towards the secondWhen the failure times of the two cells to initiate the random access request are increased from 4 times to 5 times, the T is still enabledcell＝Tcell+t。
Alternatively, the time threshold updating unit 22 sets the time threshold TcellThe number of times of failure N of the user terminal to initiate the random access request to the second cell increases exponentially, that is, when the number of times of failure N of the random access request increases gradually, each time the time threshold updating unit 22 updates TcellIs increased by a different time interval tN. For example, when the number of failures of the user terminal to initiate the random access request to the second cell is increased from 0 to 1, let T becell＝Tcell+ t; when the failure times of the user terminal to initiate the random access request to the second cell is increased from 1 to 2, the T is enabledcell＝Tcell+t2(ii) a And when the failure times of the user terminal to initiate the random access request to the second cell is increased from 4 times to 5 times, making Tcell＝Tcell+t5。
Of course, in other preferred embodiments of the present invention, the time threshold T is setcellThe number N of failures of the ue to initiate the random access request to the second cell may be increased according to any other setting.
According to the above, in the reselection optimization system after the random access cell fails, the following conditions exist for setting the time threshold to zero and clearing the cell information:
1. when a cell (a second cell) which a user terminal wants to initiate a random access request is no longer a neighboring cell of a cell (a first cell) which the user terminal has currently accessed and resided in;
2. when a cell (a first cell) which is accessed and resided by a user terminal currently belongs to a new PLMN, and the new PLMN is not an EPLMN of an original PLMN;
3. when the user terminal is restarted, or the SIM card is replaced;
4. after the user terminal has initiated a request for random access to the second cell and successfully camps on it.
In a preferred embodiment of the inventionWhen the user terminal is currently accessed and resides in a cell B (a first cell), an access pre-judging module 1 pre-judges whether the user terminal and a cell A (a second cell) meet an access criterion; the judgment result is as follows: the cell a is really a neighbor cell of the cell B, and the cell B still belongs to the original PLMN, and the user terminal is not restarted or changed. At this time, the time threshold T is set according to the corresponding A cellcellStarting a timer to count time when a time threshold T is reachedcellBefore, no access request is initiated to the cell A; upon reaching the time threshold TcellThereafter, the user terminal is allowed to initiate an access request to the a-cell if the a-cell is selected again according to the reselection rule. If the access to the cell a is successful, the counter 21 sets the number of times of failure of the user terminal to initiate the random access request to the cell a to zero, so that the time threshold updating unit 22 updates the time threshold TcellAnd setting zero and clearing the A cell information stored in the user terminal.
In a second preferred embodiment of the present invention, when a user equipment has currently accessed and resided in a cell B (a first cell), an access pre-judging module 1 pre-judges whether the user equipment and a cell a (a second cell) meet an access criterion; the judgment result is as follows: the cell a is really a neighbor cell of the cell B, and the cell B still belongs to the original PLMN, and the user terminal is not restarted or changed. At this time, the time threshold T is set according to the corresponding A cellcellStarting a timer to count time when a time threshold T is reachedcellBefore, no access request is initiated to the cell A; upon reaching the time threshold TcellThereafter, the user terminal is allowed to initiate an access request to the a-cell if the a-cell is selected again according to the reselection rule. If the access to the cell a fails, the counter 21 updates the number of failures of the ue initiating the random access request to the cell a (i.e. the number of failures is accumulated to 1), so that the time threshold updating unit 22 resets the time threshold (increases the time threshold according to the number of failures), and the ue remains camped on the cell B.
In the third preferred embodiment of the present invention, when the user terminal has currently accessed and resided in the B cell (first cell), the access anticipation module 1 is paired withWhether a user terminal and a cell A (a second cell) meet an access criterion is judged in advance; the judgment result is as follows: the cell a is really a neighbor cell of the cell B, and the cell B still belongs to the original PLMN, and the user terminal is not restarted or changed. At this time, the time threshold T is set according to the corresponding A cellcellStarting a timer to count time when a time threshold T is reachedcellBefore, no access request is initiated to the cell A; during this time, the user terminal needs to initiate a random access request to other cells that meet the reselection criteria. However, if it is found during reselection that a cell is the only cell currently meeting the reselection criteria and B cell has no longer met the camping criteria, then a cell will no longer be subject to the time threshold TcellThe user terminal may be allowed to currently initiate an access request to the a cell.
In a fourth preferred embodiment of the present invention, when the ue has currently accessed and camped in the cell B (the first cell), the access pre-determining module 1 pre-determines whether the ue and the cell a (the second cell) meet the access criterion; the judgment result is as follows: the cell a is really the neighbor cell of the cell B, and the cell B still belongs to the original PLMN, but the user terminal restarts or changes cards. At this time, the counter 21 is needed to set the number of failures of the ue to initiate the random access request to the cell a to zero, so that the time threshold updating unit 22 updates the time threshold TcellAnd setting zero and clearing the A cell information stored in the user terminal.
In a fifth preferred embodiment of the present invention, when the ue has currently accessed and camped in the B cell (the first cell), the access pre-determining module 1 pre-determines whether the ue and the a cell (the second cell) meet the access criterion; the judgment result is as follows: the a-cell is indeed a neighbor of the B-cell, but the B-cell already belongs to a new PLMN, and the new PLMN is not the EPLMN of the original PLMN. At this time, the counter 21 is needed to set the number of failures of the ue to initiate the random access request to the cell a to zero, so that the time threshold updating unit 22 updates the time threshold TcellAnd setting zero and clearing the A cell information stored in the user terminal.
In a sixth preferred embodiment of the invention, the user terminalWhen a cell B (a first cell) is accessed and resided at present, an access pre-judging module 1 pre-judges whether a user terminal and a cell A (a second cell) meet an access criterion; the judgment result is as follows: the cell a is not a neighbor of the cell B. At this time, the counter 21 is needed to set the number of failures of the ue to initiate the random access request to the cell a to zero, so that the time threshold updating unit 22 updates the time threshold TcellAnd setting zero and clearing the A cell information stored in the user terminal.
In summary, the reselection optimization system and method for the failed random access cell provided by the present invention, by setting the time threshold for the cell which once requested to have access failure, ensures that the user terminal does not initiate a random access request to the cell until the time threshold is reached, thereby solving the problem that the user terminal repeatedly initiates random access to the cell and causes frequent network disconnection, and effectively improving user experience.
As will be appreciated by one skilled in the art, the above-described embodiments may be provided as a method, apparatus, or computer program product. These embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. All or part of the steps in the methods according to the embodiments may be implemented by a program instructing related hardware, where the program may be stored in a storage medium readable by a computer device and used to execute all or part of the steps in the methods according to the embodiments.
The various embodiments described above are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a computer apparatus to produce a machine, such that the instructions, which execute via the processor of the computer apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (7)
1. A system for optimizing reselection after a random access cell failure, comprising:
the access pre-judging module is used for pre-judging whether the user terminal and the second cell meet the access criterion when the user terminal is currently accessed to and resides in the first cell;
the timing module is connected with the access pre-judging module and sets a time threshold value for allowing access for the second cell when judging that the user terminal and the second cell meet the access reselection criterion;
the access request module is connected with the timing module, after the time threshold is reached, the user terminal initiates a request of random access to the second cell through the access request module, and the timing module updates the time threshold according to the request result;
the timing module comprises:
the counter is connected with the access request module and records the failure times of the user terminal initiating the random access request to the second cell;
a time threshold updating unit connected with the counter and resetting the time threshold according to the failure times of the user terminal initiating the random access request to the second cell;
the timer is connected with the time threshold updating unit and is used for timing the request of the user terminal for initiating the random access to the second cell according to the latest time threshold;
the access anticipation module comprises: the device comprises a neighbor cell pre-judging unit, a PLMN pre-judging unit and a restart pre-judging unit;
the time threshold updating unit sets the time threshold to zero and clears the information of the second cell stored in the user terminal when the second cell is judged to be not the neighbor cell of the first cell; otherwise, the PLMN prejudging unit judges;
the PLMN prejudging unit is connected with the time threshold updating unit, and when the first cell is judged to belong to a new PLMN and the new PLMN does not belong to the EPLMN of the original PLMN, the time threshold updating unit sets the time threshold to zero and clears second cell information stored in the user terminal; otherwise, restarting the prejudgment unit for judgment;
the restarting prejudging unit is connected with the time threshold updating unit, and when the user terminal is judged to be restarted or the SIM card is replaced, the time threshold updating unit sets the time threshold to zero and clears second cell information stored in the user terminal; otherwise, the time threshold updating unit sets the time threshold allowing access for the second cell;
the access request module comprises:
the access feedback unit is connected with the counter, and when the user terminal is fed back to be successfully accessed into the second cell, the counter sets the failure times of the user terminal for initiating the random access request to the second cell to zero, so that the time threshold updating unit sets the time threshold to zero, and clears the second cell information stored in the user terminal; when the user terminal is fed back to be unsuccessfully accessed to the second cell, the counter updates the failure times of the user terminal initiating the random access request to the second cell, so that the time threshold updating unit resets the time threshold, and the user terminal still stays in the first cell.
2. The system as claimed in claim 1, wherein the time threshold updating unit sets the time threshold to increase linearly or exponentially with the number of failures of the ue to initiate the random access request to the second cell.
3. The system for optimizing reselection after random access cell failure of claim 1, wherein said access request module further comprises:
a lead code sending unit, by which the user terminal sends a lead code requesting random access to the second cell;
the response unit is connected with the lead code sending unit, and the second cell sends response information of random access to the user terminal through the response unit;
the RRC request unit is connected with the response unit, and the user terminal sends an RRC connection request to the second cell through the RRC request unit;
the access feedback unit is connected with the RRC request unit.
4. A reselection optimization method after a random access cell fails, characterized in that, the reselection optimization method is implemented by the reselection optimization system according to any one of claims 1 to 3, and comprises the following steps:
s1, when the user terminal has accessed and resided in the first cell, the access prejudgment module prejudges whether the user terminal and the second cell meet the access criterion;
s2, when the user terminal and the second cell are judged to meet the access reselection criterion, the timing module sets a time threshold value for the second cell for allowing access;
s3, after reaching the time threshold, the user terminal sends the request of random access to the second cell through the access request module, and the timing module updates the time threshold according to the request result;
the step S1 specifically includes the following steps:
s11, the adjacent cell prejudging unit judges whether the second cell is the adjacent cell of the first cell; if yes, proceed to S12; if not, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
s12, the PLMN prejudging unit judges whether the first cell belongs to a new PLMN or not and whether the new PLMN belongs to the EPLMN of the original PLMN or not; if the first cell belongs to the new PLMN and the new PLMN does not belong to the EPLMN of the original PLMN, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal; otherwise, execution continues with S13;
s13, the restart prejudging unit judges whether the user terminal restarts or whether the SIM card is replaced; if not, continue to execute S2; if so, the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
the S3 specifically includes the steps of:
s34, the access feedback unit feeds back the result of the random access;
when the user terminal is successfully accessed into the second cell, the counter sets the failure times of the user terminal initiating the random access request to the second cell to zero, so that the time threshold updating unit sets the time threshold to zero and clears the second cell information stored in the user terminal;
when the user terminal is not successfully accessed to the second cell, the counter updates the failure times of the user terminal initiating the random access request to the second cell, so that the time threshold updating unit resets the time threshold and the user terminal still stays in the first cell.
5. The method as claimed in claim 4, wherein the S2 specifically includes the following steps:
s21, the timer times the request of the user terminal for initiating the random access to the second cell according to the time threshold; during the period, the user terminal needs to initiate a random access request to other cells meeting the reselection criterion;
and S22, after the time threshold is reached, the user terminal selects the second cell as the object for initiating the random access request again according to the reselection rule.
6. The method as claimed in claim 5, wherein in S34, the time threshold updating unit sets the time threshold to increase linearly or exponentially with the number of failures of the ue to initiate the random access request to the second cell.
7. The method of claim 4 for optimizing reselection after random access cell failure,
in S3, the method further includes:
s31, the user terminal sends a lead code requesting random access to the second cell through the lead code sending unit;
s32, the second cell sends the response information of random access to the user terminal through the response unit;
s33, the ue sends an RRC connection request to the second cell through the RRC request unit, and feeds back a result of the random access to the access feedback unit.
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| US8774817B2 (en) * | 2009-10-02 | 2014-07-08 | Blackberry Limited | Apparatus and method for handling a connection reject message |
| CN101820666B (en) * | 2010-04-16 | 2012-05-23 | 华为终端有限公司 | Terminal and method for acquiring network service by terminal |
| CN102548012B (en) * | 2010-12-22 | 2019-03-15 | 中兴通讯股份有限公司 | A kind of accidental access method and terminal |
| CN102857981B (en) * | 2011-06-29 | 2017-09-29 | 中兴通讯股份有限公司 | A kind of method and device for realizing cell reselection |
| ES2874199T3 (en) * | 2011-10-10 | 2021-11-04 | Samsung Electronics Co Ltd | Procedure and device to perform random access in a secondary cell |
| KR101545108B1 (en) * | 2011-11-11 | 2015-08-17 | 엘지전자 주식회사 | Method and apparatus for handling signals used for extended access class barring in a wireless communication |
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