CN106888468B - Anti-ping-pong switching optimization method and system and base station - Google Patents
Anti-ping-pong switching optimization method and system and base station Download PDFInfo
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- CN106888468B CN106888468B CN201510937443.8A CN201510937443A CN106888468B CN 106888468 B CN106888468 B CN 106888468B CN 201510937443 A CN201510937443 A CN 201510937443A CN 106888468 B CN106888468 B CN 106888468B
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Abstract
The invention discloses an optimization method and system for preventing ping-pong handover and a base station, which are used for avoiding or reducing the occurrence of ping-pong handover between cells of a terminal. In some possible embodiments, the method comprises: detecting whether the terminal has ping-pong switching between two cells; if yes, determining a normal cell and a problem cell in the two cells; when the starting condition is met, starting a protection mode; wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell; the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a ping-pong handover prevention optimization method, a ping-pong handover prevention optimization system and a base station.
Background
In GSM (Global System for Mobile Communication) voice calls, GSM is subject to cell switching due to user mobility. GSM cell handover requires first interrupting the contact with the original cell and then initiating access in the new cell, this handover is called hard handover, where there is a short interruption in communication.
Because the handover command is issued by the network, when the network issues the handover command, the terminal must perform cell handover, otherwise, communication interruption occurs. The prior art does not provide for particular optimization and protection for cell handover. Due to the real-time property of voice communication, no retransmission mechanism exists, which can cause the voice of the user to be interrupted, and cause poor user experience.
In the middle zone covered by the two cells, because the signal quality of the two cells is equivalent, if the network control is not good, the terminal can be frequently switched back and forth, namely ping-pong switching, the more the switching times are, the more the voice interruption occurs, and the worse the user experience is. In addition, when the signal conditions of the broadcast frequency point and the service frequency point assigned by the network are greatly different, ping-pong switching is also easily caused.
Disclosure of Invention
The embodiment of the invention provides an optimization method and system for preventing ping-pong handover and a base station, which are used for avoiding or reducing the occurrence of ping-pong handover between cells of a terminal.
The invention provides an optimization method for preventing ping-pong handover, which comprises the following steps: detecting whether the terminal has ping-pong switching between two cells; if yes, determining a normal cell and a problem cell in the two cells; when the starting condition is met, starting a protection mode; wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell; the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
Wherein, the protection mode can be exited when the stop condition is met; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
The second aspect of the present invention provides an anti-ping-pong handover optimization system, comprising: the processing module is used for detecting whether the terminal has ping-pong switching between the two cells; if yes, determining a normal cell and a problem cell in the two cells; the control module is used for entering a protection mode when the starting condition is met; wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell; the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
The control module can also be used for exiting the protection mode when the stop condition is met; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
A third aspect of the present invention provides a base station, including: a transmitter, a receiver, a modulator, a demodulator, a processor, a controller, and an antenna; the controller is used for detecting whether the terminal has ping-pong handover between two cells; if yes, determining a normal cell and a problem cell in the two cells; when the starting condition is met, starting a protection mode; wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell; the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
The controller can also be used for exiting the protection mode when the stop condition is met; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
As can be seen from the above, in some feasible embodiments of the present invention, a ping-pong handover scenario can be identified, and a protection mode is started when a start condition is satisfied, and in the protection mode, the probability of cell handover can be reduced by correcting a reported signal measurement value, so that ping-pong handover occurring between cells by a terminal is avoided or reduced. And the terminal can exit the protection mode in time when the stop condition is met, so that the terminal can be switched by normal cells, and the problem of mobility call drop caused by the fact that the terminal is not switched is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only 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 creative efforts.
Fig. 1 is a schematic diagram of a communication system to which the present invention relates;
fig. 2 is a schematic flow chart of an anti-ping-pong handover optimization method according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating an exemplary application scenario of the present invention;
fig. 4 is a schematic structural diagram of an anti-ping-pong handover optimization system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the 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.
The terms "first," "second," "third," and the like in the description and in the claims, and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The technical solution of the embodiment of the present invention relates to a communication system, as shown in fig. 1, the communication system includes a network side and a user side, the user side includes a terminal 101, which may also be called a Mobile Station (MS); the network side includes a Base Station (Node B)102 and a Base Station Controller (BSC) 103, wherein the Base Station may include a Base Transceiver Station (BTS).
The BTS includes radio transmitting/receiving equipment, an antenna, and a signal processing section unique to all radio interfaces. The BTS may be considered as a radio modem responsible for the processing of the reception and transmission of mobile signals. The BTS is controlled by the BSC and serves the radio transceiver equipment of a cell. A BSC typically controls several BTSs and its main functions are radio channel management, call and communication link setup and teardown, and control of handoffs for mobile stations within the control area.
In a conventional cellular mobile communication network, a group of adjacent cells exists around a terminal, the terminal communicates with only one cell at the same time, and when the terminal moves to cause the terminal to cross the boundary of two cells, an inter-cell handover is triggered. Typically, the handover is performed between two cells within a base station controller, and the two cells may belong to the same base station or to different base stations.
The triggering process of the cell switching comprises the following steps: the terminal measures information such as signal strength, signal-to-noise ratio and the like of downlink signals of a group of surrounding cells, sends the signal measurement information to a base station, and reports the signal measurement information to a base station controller; and the base station controller analyzes according to the signal measurement information and performs cell switching on the terminal.
In order to solve the problem of ping-pong handover described in the background section, embodiments of the present invention provide a method and a system for optimizing ping-pong handover prevention, and a base station, so as to avoid or reduce ping-pong handover between cells of a terminal.
The following are detailed descriptions of the respective embodiments.
(example one)
Referring to fig. 2, an embodiment of the present invention provides an optimization method for preventing ping-pong handover, which includes:
210. detecting whether the terminal has ping-pong switching between two cells; and if so, determining a normal cell and a problem cell in the two cells.
The base station may detect whether the terminal has performed cell handover, and when the terminal performs repeated handover between two cells in a short time, for example, one cell is handed over at least twice in a short time, or each cell is handed over at least twice, it means that the terminal may perform ping-pong handover. Ping-pong handover refers to frequent back-and-forth handover of a terminal between two cells within a short time. The short time may be, for example, 1 minute or 30 seconds or a value between 1 minute and 30 seconds.
In some embodiments, the following method may be adopted to determine whether the detecting terminal performs ping-pong handover between two cells:
a1, acquiring the cell switching sequence, the residence time of each cell and the signal quality of each cell of the terminal in the communication process;
a2, if the terminal is switched repeatedly between two cells, calculating whether the average time of the two cells is less than the threshold value, if yes, then judging that the terminal is switched ping-pong between the two cells.
In some embodiments, the determining the normal cell and the problem cell of the two cells may include:
a3, calculating the average time of stay of the two cells, if the average time of stay of one cell is not less than twice of the average time of stay of the other cell, determining the cell with smaller average time of stay as the problem cell, and determining the cell with longer average time of stay as the normal cell, otherwise, determining that the two cells are both normal cells.
In some embodiments, the signal quality of the cell may be expressed in terms of bit-error-rate (ber), but in other embodiments, other parameters may be used.
The following examples illustrate:
the two cells are denoted by a and B, respectively, and as shown in table 1, when a handover occurs between the two cells a and B, the cell handover sequence may be expressed, for example, in the form of a-B-a (indicating a handover from a to B to a), and the signal quality of the cell may be specifically denoted by the filtered ber.
TABLE 1
| Cell A | B cell | Cell A | B cell | Cell A | B cell |
If the terminal is repeatedly switched between two cells in the conversation process, for example, the cell switching sequence is A-B-A-B, or A-B-A, or B-A-B, or A-B-A-B-A, and the like, the terminal high-speed moving scene of the terminal can be excluded, and the possibility of ping-pong switching is high, the following parameters can be calculated so as to judge whether ping-pong switching occurs according to the calculated parameters.
Average _ Timing _ AB: AB average time of residence of two cells; (it is possible that the residence time of B is only one sample)
Average _ Timing _ A: average time of residence of A cell;
average _ Timing _ B: average time of residence of B cell; (it is possible that the residence time of B is only one sample)
Taking the cell switching sequence as a-B-a-B as an example, the time spent in each cell is 5,3,5, and 3 (unit is second), the average time spent in two cells AB is 4 seconds (i.e. the first four values and the second value are divided by 4), the average time spent in cell a is 5 seconds, and the average time spent in cell B is 3 seconds.
And after each cell switching, calculating whether the average time of the stay of the two cells is less than a threshold value, and if so, judging that the terminal has ping-pong switching between the two cells. For example, the threshold may be set to 30S, and if there is (Average _ Timing _ AB <30S), it may be determined that the terminal performs ping-pong handover between the two cells a and B, and the following steps of determining a normal cell and a problem cell are continuously performed.
Then, problem cells can be identified according to the residence time of the cells, for example, whether the average residence time of one cell is not less than twice the average residence time of the other cell can be judged:
if the cell A is (Average _ Timing _ A > -2 × Average _ Timing _ B), determining that the cell B is a problem cell and the cell A is a normal cell;
if the cell is (Average _ Timing _ B > -2 × Average _ Timing _ A), determining the cell A as a problem cell and the cell B as a normal cell;
otherwise, determining that the cells A and B are both normal cells. In other embodiments, the problem cell may be identified in other manners, for example, a cell with a shorter average time to stay is determined as the problem cell, and a cell with a longer average time to stay is determined as the normal cell.
In this step, if ping-pong handover is identified and a problem cell is identified, it can be further determined whether a protection mode for preventing ping-pong handover needs to be started.
220. When the starting condition is met, starting a protection mode;
wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell;
the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
It should be noted that the precondition for determining whether to perform a handover is that a ping-pong handover occurs. If the ping-pong switching occurs, and the starting condition is met; the protected mode may be initiated.
In some embodiments, the condition that the signal quality of the current serving cell meets the requirement may be: three consecutive bers after Alpha (Alpha) filtering are less than 0.5 percent; of course, in other embodiments, other requirements are possible, such as four consecutive bers < ═ 0.6%, and so on.
In some embodiments, the start-up condition may further include: the problem cell is within m strong, m being a natural number, for example a natural number not greater than 6. The problem cell is within m strong, which means that: the signal strength of the problem cell is ranked within the top m in all neighboring cells of the current serving cell.
When the starting condition is met, starting a protection mode, wherein in the protection mode:
if the terminal sends the signal measurement information containing the signal measurement value to the base station, the base station does not directly report the signal measurement values to the base station controller after acquiring the signal measurement values of the current service cell and all the adjacent cells (including the two cells) of the terminal, but firstly reduces the signal measurement value of the designated cell and reports the reduced signal measurement value to the base station controller.
Wherein the designated cell includes at least the problem cell. In some embodiments, the designated cell may include all neighboring cells of the current serving cell, and at this time, signal measurement values of all neighboring cells of the current serving cell are subjected to reduction processing and reported to the base station controller.
Wherein, the signal measurement specifically refers to a signal strength measurement. The signal strength measurement can be expressed in dBm, which is a value representing the absolute value of the power (which can be considered as a ratio based on 1mW power) and is calculated by the formula: 10log (power value/1 mw). In the dB, dBm calculation, when one dBm is subtracted by another dBm, the result is dB.
The higher the signal measurement for a cell, the higher the probability that the cell is handed over. In the protection mode, the probability that the terminal is switched to the adjacent cell can be reduced by reducing the signal measurement value reported by each adjacent cell, so that the probability that the terminal resides in the current serving cell is improved, the probability of switching can be reduced, and ping-pong switching is avoided or the probability of ping-pong switching is reduced.
In some embodiments, the reporting to the base station controller after performing reduction processing on the signal measurement values of all neighboring cells of the current serving cell may include:
b1, subtracting the signal measured values of all the adjacent cells by a first preset value, such as 20db respectively;
b2, for any cell, if the signal measured value of the cell after subtracting 20db is less than a second preset value, for example, -110db, then taking the second preset value, for example, -110db, as the signal measured value after the cell reduction processing, otherwise, taking the signal measured value of the cell after subtracting the first preset value, for example, 20db, as the signal measured value after the cell reduction processing;
b3, reporting the signal measurement value of all adjacent cells after reduction processing to the base station controller.
Namely, the signal measurement values reported by all the adjacent cells are-20 dB, and the protection of-110 dBm is carried out at the minimum value.
Optionally, the method may further include the following steps:
230. when the stop condition is met, the protection mode is exited;
wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
After the ping-pong switching occurs, if the protection mode is started, judging whether a stop condition for exiting the protection mode is met in real time after the protection mode is started, and if so, exiting the protection mode.
For example, the following steps are carried out: and if the current serving cell is a normal cell and the signal quality of the current serving cell is degraded and the degradation amplitude is larger than a threshold value, for example ber after Alpha filtering is larger than 0.5%, exiting the protection mode.
Therefore, once the signal of the current serving cell is degraded, the protection mode can be exited, and then the terminal can be performed with normal cell handover, so that the problem of mobility call drop caused by the handover failure can be avoided.
It is worth noting that in some embodiments, the signal quality of a cell, such as bit error rate (ber), may be counted as follows:
only sub ber (sub bit error rate) can be counted, 1/2alpha filtering is carried out on the sub ber, and the filtered ber is judged:
performing alpha filtering calculation once in each measurement period, wherein the calculation method comprises the following steps:
wherein the first measurement cycle: sub _ ber _ filter (0) ═ sub _ ber (0)
The following measurement cycle:
sub_ber_filter(n)＝alpha*sub_ber(n)+(1-alpha)*sub_ber_filter(n-1)；
the filtered ber of each measurement period can be calculated by adopting the formula.
Referring to table 2, in the embodiment of the present invention, the technical scheme of the present invention is further subjected to time delay verification, and in a problem scene (static state) regression, compared with the scheme in the prior art, the optimization scheme of the present invention greatly reduces the switching times and obviously improves the voice discontinuity. In addition, regression comparison is carried out on fast moving scenes such as high-speed rails and high-speed rails, and abnormality caused by an optimization scheme is avoided.
TABLE 2
In order to better understand the technical solutions provided by the embodiments of the present invention, the following description is given by taking an implementation mode in a specific scenario as an example.
Referring to fig. 3, a specific process of the present scenario embodiment may include:
beginning:
and S1, recording the switching sequence of each cell, the staying time of each cell and the signal quality during the conversation.
S2, if the switching path is found to be a repeated switching of a-B-a-B (four times of switching occurs), then calculate the following parameters:
average _ Timing _ AB: average time of stay of AB cell;
average _ Timing _ A: average time of residence of A cell;
average _ Timing _ B: average time of B cell stay.
S3, determining whether there is Average _ Timing _ AB <30S, if not, indicating that ping-pong handover does not occur, and if so, indicating that ping-pong handover occurs, and then, entering step S4.
And S4, setting the cell with short stay time as the problem cell.
S5, judging whether the following switching conditions are met: flag & (current serving cell is normal cell) & (three consecutive bers after Alpha filtering < ═ 0.5%) & (problem cell is within 6 strength); wherein, "& &" represents "and". If the judgment result is yes, the process proceeds to step S6, otherwise, the process proceeds to step S7.
S6, starting a protection mode: and measuring the reported signal values of all the adjacent cells to 20dB, and performing protection with the minimum value of 110 dBm.
S7, judging whether the following exit conditions are met: flag & (current serving cell is normal cell) & (ber after Alpha filtering > 0.5%).
S8, if yes in step S7, the protection mode is exited with Flag set to false.
And (6) ending.
As can be seen from the above, in some possible embodiments of the present invention, an optimization method for preventing ping-pong handover is disclosed, and it can be understood that the above-described scheme can be embodied in, for example, a base station device. The technical scheme can identify the ping-pong switching scene and start the protection mode when the starting condition is met, and under the protection mode, the probability of cell switching can be reduced by correcting the reported signal measurement value, so that the ping-pong switching of the terminal between the cells can be avoided or reduced. And the terminal can exit the protection mode in time when the stop condition is met by monitoring the signal quality condition of the current service cell, so that the terminal can be switched by the normal cell, and the problem of mobility call drop caused by the switching failure is avoided.
(example two) in order to better implement the above-mentioned solution of the embodiment of the present invention, the following also provides a related apparatus for implementing the above-mentioned solution cooperatively.
Referring to fig. 4, an embodiment of the invention provides a ping-pong handover prevention optimization system 400, which may include: .
A processing module 410, configured to detect whether a terminal performs ping-pong handover between two cells; if yes, determining a normal cell and a problem cell in the two cells;
a control module 420 for entering a protection mode when a start condition is satisfied;
wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell;
the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
Wherein the processing module 410 and the control module 420 may correspond to a controller of a base station.
In some embodiments, the processing module 410 may include:
an obtaining unit 4101, configured to obtain a cell switching sequence, a residence time of each cell, and a signal quality of each cell during a terminal communication process;
a processing unit 4102, configured to calculate whether an average time for the terminal to stay in two cells is less than a threshold value if the terminal performs repeated handover between the two cells, and if so, determine that the terminal performs ping-pong handover between the two cells.
In some embodiments, the processing module 410 may include:
a determining unit 4103, calculating the average time of stay of each of the two cells, if the average time of stay of one cell is not less than twice the average time of stay of the other cell, determining the cell with the smaller average time of stay as a problem cell, and determining the cell with the longer average time of stay as a normal cell, otherwise, determining that the two cells are both normal cells.
In some embodiments, the system 400 may further include: a reporting module 430, configured to report to the base station controller after the terminal enters the protection mode and after the signal measurement values of all neighboring cells of the current serving cell are all subjected to reduction processing.
In some embodiments, the reporting module 430 is specifically configured to: subtracting 20db from the signal measurements of all neighbouring cells respectively; for any one of the cells, if the signal measurement value of the cell minus 20db is less than-110 db, then taking-110 db as the signal measurement value after the cell reduction processing, otherwise, taking the signal measurement value of the cell minus 20db as the signal measurement value after the cell reduction processing; and reporting the signal measurement values of all the adjacent cells after the reduction processing to the base station controller.
The reporting module 430 may correspond to a transmitter of a base station.
In some embodiments, the control module 420 is further configured to exit the protection mode when a stop condition is satisfied; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
It can be understood that the functions of each functional module of the ping-pong handover prevention optimization system according to the embodiment of the present invention can be specifically implemented according to the method in the embodiment of the method, and the specific implementation process thereof can refer to the related description in the embodiment of the method, which is not described herein again.
As can be seen from the above, in some feasible embodiments of the present invention, a ping-pong handover scenario can be identified, and a protection mode is started when a start condition is satisfied, and in the protection mode, the probability of cell handover can be reduced by correcting a reported signal measurement value, so that ping-pong handover occurring between cells by a terminal is avoided or reduced. And the terminal can exit the protection mode in time when the stop condition is met by monitoring the signal quality condition of the current service cell, so that the terminal can be switched by the normal cell, and the problem of mobility call drop caused by the switching failure is avoided.
(embodiment three) referring to fig. 5, an embodiment of the present invention further provides a base station 500, which may include:
a transmitter 501, a receiver 502, a demodulator 503, a modulator 504, a processor 505, a controller 506, an antenna 507; wherein, the processor 505 may include a transmit data processor 5501 for a transmit channel, and a receive data processor 5502 for a receive channel;
the transmitter 501 and the receiver 502 are respectively connected with an antenna 507, the demodulator 503 is connected with the receiver 502, the modulator 504 is connected with the transmitter 501, and the processor 505 is respectively connected with the demodulator 503 and the modulator 504. The processor 505 is configured to process received data or data to be transmitted, wherein the received data processor 5502 is coupled to the demodulator 503, and the transmitted data processor 5501 is coupled to the modulator 504. The controller 506 is connected to the demodulator 503, the modulator 504 and the processor 505 respectively, and is configured to control the demodulator 503, the modulator 504 and the processor 505; optionally, a memory 508 may be included, and the controller 506 may be further coupled to the memory 508 for performing necessary data reading.
The general workflow of the base station 500 is: data to be transmitted enters the processor 505 first, and is subjected to baseband operations such as blocking, encoding, interleaving, scrambling and the like, and then is sent to the modulator 504 for signal modulation, and finally is transmitted through the transmitter 501; for the received signal, the opposite process is performed, the demodulation is performed through the demodulator 503, and then the signal enters the receiving processor 505 to perform operations such as descrambling, deinterleaving, decoding and the like, so as to obtain the required received data; the specific parameters and implementation steps of the processor 505, the modulator 504 and the demodulator 503 are all controlled by the controller 506.
In the embodiment of the present invention, the controller 506 is configured to detect whether a ping-pong handover occurs between two cells of a terminal; if yes, determining a normal cell and a problem cell in the two cells; when the starting condition is met, starting a protection mode; wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell; the protection mode includes: and if the signal measurement value of each cell comprising the two cells is obtained, at least the signal measurement value of the cell with the problem is subjected to reduction processing and reported to a base station controller.
In some embodiments, the controller 506 is further configured to obtain a cell switching sequence of the terminal during a call, a time of each cell staying, and a signal quality of each cell; if the terminal is switched repeatedly between the two cells, calculating whether the average time of the stay of the two cells is less than a threshold value, and if so, judging that the terminal is switched between the two cells in a ping-pong manner.
In some embodiments, the controller 506 is further configured to calculate an average time of residence of each of the two cells, determine a cell with a smaller average time of residence as a problem cell and a cell with a longer average time of residence as a normal cell if the average time of residence of one cell is not less than twice the average time of residence of the other cell, and otherwise determine that both the two cells are normal cells.
In some embodiments, the controller 506 is further configured to perform reduction processing on signal measurement values of all neighboring cells of a current serving cell of the terminal after the protection mode is started;
the transmitter 501 is configured to report, according to the control of the controller 506, signal measurement values of all neighboring cells of the current serving cell of the terminal after reduction processing to the base station controller.
In some embodiments, the controller 506 is further configured to subtract 20db from the signal measurements of all neighboring cells; and for any one cell, if the signal measurement value of the cell minus 20db is less than-110 db, then taking-110 db as the signal measurement value after the cell reduction processing, otherwise, taking the signal measurement value of the cell minus 20db as the signal measurement value after the cell reduction processing.
In some embodiments, the controller 506 is further configured to exit the protection mode when the stop condition is satisfied; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
As can be seen from the above, in some feasible embodiments of the present invention, the base station may identify a ping-pong handover scenario, and start the protection mode when the start condition is satisfied, and in the protection mode, the probability of cell handover may be reduced by correcting the reported signal measurement value, thereby avoiding or reducing the occurrence of ping-pong handover between cells by the terminal. And the terminal can exit the protection mode in time when the stop condition is met by monitoring the signal quality condition of the current service cell, so that the terminal can be switched by the normal cell, and the problem of mobility call drop caused by the switching failure is avoided.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
It should be noted that, in essence, part of the technical solutions or all or part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The ping-pong handover prevention optimization method, the ping-pong handover prevention optimization system and the base station provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (12)
1. An optimization method for preventing ping-pong handover, the method comprising:
detecting whether the terminal has ping-pong switching between two cells;
if yes, determining a normal cell and a problem cell in the two cells;
when the starting condition is met, starting a protection mode;
wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell;
the protection mode includes: if the signal measurement value of each cell including the two cells is obtained, subtracting 20db from the signal measurement values of all the adjacent cells respectively; for any one of the cells, if the signal measurement value of the cell minus 20db is less than-110 db, then taking-110 db as the signal measurement value after the cell reduction processing, otherwise, taking the signal measurement value of the cell minus 20db as the signal measurement value after the cell reduction processing; and reporting the signal measurement values of all the adjacent cells after the reduction processing to a base station controller.
2. The method of claim 1, wherein the detecting whether the terminal has ping-pong handover between two cells comprises:
acquiring a cell switching sequence, residence time of each cell and signal quality of each cell of the terminal in a call process;
if the terminal is switched repeatedly between the two cells, calculating whether the average time of the stay of the two cells is less than a threshold value, and if so, judging that the terminal is switched between the two cells in a ping-pong manner.
3. The method of claim 2, wherein the determining a normal cell and a problem cell of the two cells comprises:
and calculating the average residence time of the two cells, if the average residence time of one cell is not less than twice of the average residence time of the other cell, determining the cell with the smaller residence time as a problem cell, and determining the cell with the longer residence time as a normal cell, otherwise, determining that the two cells are both normal cells.
4. The method according to any one of claims 1-3, further comprising:
when the stop condition is met, the protection mode is exited;
wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
5. An anti-ping-pong handover optimization system, the system comprising:
the processing module is used for detecting whether the terminal has ping-pong switching between the two cells; if yes, determining a normal cell and a problem cell in the two cells;
the control module is used for entering a protection mode when the starting condition is met;
wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell;
the protection mode includes: if the signal measurement value of each cell including the two cells is obtained, subtracting 20db from the signal measurement values of all the adjacent cells respectively; for any one of the cells, if the signal measurement value of the cell minus 20db is less than-110 db, then taking-110 db as the signal measurement value after the cell reduction processing, otherwise, taking the signal measurement value of the cell minus 20db as the signal measurement value after the cell reduction processing; and reporting the signal measurement values of all the adjacent cells after the reduction processing to a base station controller.
6. The system of claim 5, wherein the processing module comprises:
an obtaining unit, configured to obtain a cell switching sequence, a residence time of each cell, and a signal quality of each cell during a terminal call;
and the processing unit is used for calculating whether the average time of the stay of the two cells is less than a threshold value or not if the terminal is repeatedly switched between the two cells, and judging that the terminal is subjected to ping-pong switching between the two cells if the average time of the stay of the two cells is less than the threshold value.
7. The system of claim 5, wherein the processing module comprises:
and the determining unit is used for calculating the average residence time of the two cells, if the average residence time of one cell is not less than twice of the average residence time of the other cell, the cell with the smaller residence average time is determined as a problem cell, and the cell with the longer residence average time is determined as a normal cell, otherwise, the two cells are both determined as normal cells.
8. The system according to any one of claims 5-7,
the control module is also used for exiting the protection mode when the stop condition is met;
wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
9. A base station, characterized in that the base station comprises:
a transmitter, a receiver, a modulator, a demodulator, a processor, a controller, and an antenna; wherein the content of the first and second substances,
the controller is used for detecting whether the terminal has ping-pong switching between the two cells; if yes, determining a normal cell and a problem cell in the two cells; when the starting condition is met, starting a protection mode;
wherein the start-up conditions include: the current serving cell is a normal cell, the signal quality of the current serving cell meets the requirement, and the other cell is a problem cell;
the protection mode includes: if the signal measurement value of each cell including the two cells is obtained, subtracting 20db from the signal measurement values of all the adjacent cells respectively; for any one of the cells, if the signal measurement value of the cell minus 20db is less than-110 db, then taking-110 db as the signal measurement value after the cell reduction processing, otherwise, taking the signal measurement value of the cell minus 20db as the signal measurement value after the cell reduction processing; and reporting the signal measurement values of all the adjacent cells after the reduction processing to a base station controller.
10. The base station of claim 9,
the controller is further configured to obtain a cell switching sequence of the terminal during a call, a residence time of each cell, and a signal quality of each cell; if the terminal is switched repeatedly between the two cells, calculating whether the average time of the stay of the two cells is less than a threshold value, and if so, judging that the terminal is switched between the two cells in a ping-pong manner.
11. The base station of claim 10,
the controller is further configured to calculate an average time of stay of each of the two cells, determine, if the average time of stay of one of the two cells is not less than twice the average time of stay of the other cell, the cell with the smaller average time of stay of the two cells as a problem cell, and determine, if not, the cell with the longer average time of stay of the two cells as a normal cell.
12. Base station according to any of claims 9-11,
the controller is also used for exiting the protection mode when the stop condition is met; wherein the stop condition includes: the current serving cell is a normal cell, and the signal quality of the current serving cell is degraded and the degradation amplitude is greater than a threshold value.
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| CN102131267B (en) * | 2010-01-15 | 2014-01-15 | 电信科学技术研究院 | Method, system and device for transmitting measurement control of pilot frequency report |
| US20130229931A1 (en) * | 2012-03-02 | 2013-09-05 | Electronics And Telecommunications Research Institute | Methods of managing terminal performed in base station and terminal |
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