CN103648128A - Method and device for determining switching threshold between systems - Google Patents
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Abstract
The invention discloses a method and a device for determining a switching threshold between systems. The method comprises the following steps: when the switching threshold needs to be determined, acquiring the reception level in a measurement report reported by UE in the most recent period of time T, and drop call reception levels corresponding to drop calls in the most recent period of time T; dividing the acquired reception levels into a plurality of level sections according to set level length, and determining the drop call probability index of each level section according the drop call times in each level section; according to the pre-stored drop call probability indexes of the level section in which a plurality of pre-used switching thresholds exist, selecting the maximum pre-used switching threshold which is not smaller than the set probability and corresponds to the drop call probability index as the switching threshold, or selecting the minimum pre-used switching threshold which is smaller than the preset probability and corresponds to the drop call probability index as the switching threshold. According to the method, the switching threshold of a cell can be automatically determined in a short period, manpower and material resources are saved, and the efficiency is high.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for determining an intersystem handover threshold.
Background
At present, users using a TD (TD-SCDMA) network are increasing, the coverage of the TD network is increasing, and in order to enable users to have better use experience, a network operator has developed a dual-preference policy, that is, a joint optimization policy between a 3G (TD) network and a 2G network, that is, under the condition of ensuring user experience, it is ensured that more user terminals (both supporting the 2G network and the 3G network) stay in the 3G network, so that a proper switching threshold between the 3G network and the 2G network needs to be set, and the lower the switching threshold, the more user terminals stay in the 3G network, the higher the switching threshold, the more user terminals stay in the 2G network.
Therefore, to ensure that as many user terminals as possible stay in the 3G network, the switching threshold between networks needs to be reduced, but if the threshold is set too low, when the signal of the 3G network is not good, the user cannot switch to the 2G network (because the maturity of the 2G network is higher than that of the 3G network, the stability of the network signal is generally better than that of the 3G network, but under the 2G network, the internet speed is slower), and when the user terminal staying in the 3G network frequently has events such as call drop and network drop, the advantage of the 3G high-speed internet access cannot be utilized, and inconvenience is brought to the user.
Similarly, if the threshold is set too high, the number of users staying in the 3G network is reduced, and the number of users staying in the 2G network is relatively increased, and at this time, when the signal of the 3G network is good, users who can use the 3G network originally cannot be switched to the 3G network due to the too high switching threshold, so that the resources of the 3G network are wasted. Therefore, the problem to be solved by the joint optimization strategy between the 3G (TD) network and the 2G network is as follows: how to set a proper switching threshold on the premise of ensuring user experience is that users staying in the 3G network are as many as possible.
The existing scheme for solving the problems is that a switching threshold between networks is obtained through software simulation and simulation, and then is modified for many times according to field tests and statistics of complaints of users, so that the switching threshold between networks is obtained, but the switching threshold can be determined by one day or even one week. Although the switching threshold can be obtained by the scheme, the switching thresholds corresponding to different cell scenes are different, the scheme cannot automatically obtain the switching thresholds of all the cell scenes, and only can pass the later test modification, so that the manpower and material resources are wasted, and the efficiency is low.
Disclosure of Invention
The invention provides a method and a device for determining a switching threshold between systems, which are used for solving the problems of long time, waste of manpower and material resources and low efficiency in determining the switching threshold in the prior art.
The invention provides a method for determining a switching threshold between systems, which comprises the following steps:
when a switching threshold needs to be determined, acquiring a receiving level in a measurement report reported by UE within a latest period of time T and a dropped call receiving level corresponding to each dropped call occurring within the latest period of time T;
dividing all the obtained receiving levels into a plurality of level intervals according to a set level step length, and determining a drop call probability index of each level interval according to the drop call frequency of each level interval, wherein the drop call frequency of each level interval is the drop call receiving level number in each level interval;
according to the pre-stored drop call probability indexes of the level intervals where the plurality of pre-used switching thresholds are located, selecting the maximum pre-used switching threshold corresponding to the drop call probability index not less than the set probability as the switching threshold, or selecting the minimum pre-used switching threshold corresponding to the drop call probability index less than the set probability as the switching threshold.
The method records call drop time and a UE identifier of the call drop when the call drop occurs each time, and acquires a receiving level corresponding to each call drop occurring within a latest period of time T, and specifically comprises the following steps:
and searching the UE measurement report which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the corresponding call drop receiving level when the call is dropped.
Therefore, the drop call receiving level corresponding to each drop call can be found, and the occurrence of the drop call of the UE and the measurement report reported by the UE before the drop call are ensured to be in the same cell.
In the method, the drop probability index of each level interval is determined according to the drop times of each level interval, and the method specifically comprises the following steps:
for each level interval, taking the ratio of the number of dropped calls of the level interval to the number of received levels in the level interval as a dropped call probability index of the level interval; or,
for each level interval, taking the ratio of the number of dropped calls of the level interval to the total number of dropped calls as a dropped call probability index of the level interval; or
For each level interval, obtaining the sampling point occupation ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call times occupation ratio of the level interval according to the drop call times/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call times occupation ratio of the level interval/the sampling point occupation ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
The drop call probability indexes calculated by the three modes can reflect the drop call conditions of all level intervals to a certain extent, but the drop call probability indexes obtained by combining the drop call frequency ratio and the sampling point ratio are more accurate and reliable.
In the method, according to the pre-stored drop call probability indexes of the level intervals in which the multiple pre-used switching thresholds are located, selecting a maximum pre-used switching threshold corresponding to the drop call probability index not less than a set probability as the switching threshold, or selecting a minimum pre-used switching threshold corresponding to the drop call probability index less than the set probability as the switching threshold specifically includes:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
Therefore, the over-finding operation can be stopped when the required pre-used switching threshold is found, and the speed of determining the switching threshold is improved.
In the method, selecting, according to the pre-stored drop call probability indexes of the level intervals in which the plurality of pre-used switching thresholds are located, the maximum pre-used switching threshold corresponding to the drop call probability index not less than the set probability as the switching threshold specifically includes:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
The averaging method can enable the drop probability index corresponding to one of the pre-used switching thresholds to be more accurate and reliable, and further enable the obtained switching threshold to be more accurate.
The method further comprises the following steps:
and when the call drop probability indexes of the level intervals in which the pre-used switching thresholds are positioned are all smaller than the set probability, selecting the minimum value in the pre-used switching thresholds as the switching threshold.
The implementation mode provides a mechanism for determining the switching threshold when the call drop probability of the level interval in which all the pre-used switching thresholds are located is less than the set probability, so as to ensure that the switching threshold is finally determined.
The method further comprises the following steps:
and when the fact that the call drop does not occur within the latest period of time T is determined, selecting the minimum value of a plurality of prestored pre-used switching thresholds as the switching threshold.
When the call drop does not occur within the last period of time T, in order to ensure that more users stay in the 3G network, the minimum value of a plurality of pre-used switching thresholds stored in advance is used as the switching threshold.
The invention also provides a device for determining the switching threshold between systems, which comprises:
an obtaining unit, configured to obtain, when a handover threshold needs to be determined, a reception level in a measurement report reported by a UE within a latest time T, and a dropped call reception level corresponding to each dropped call occurring within the latest time T;
the first determining unit is used for dividing all the acquired receiving levels into a plurality of level intervals according to a set level step length, and determining the drop probability index of each level interval according to the drop frequency of each level interval, wherein the drop frequency of each level interval is the drop receiving level number in each level interval;
and the second determining unit is used for selecting a maximum pre-used switching threshold corresponding to the drop probability index which is not less than the set probability as the switching threshold or selecting a minimum pre-used switching threshold corresponding to the drop probability index which is less than the set probability as the switching threshold according to the drop probability indexes of the level intervals in which the pre-stored multiple pre-used switching thresholds are positioned.
In the apparatus, the obtaining unit is specifically configured to:
and recording the call drop time and the UE identification of the call drop when the call drop occurs every time, searching the measurement report of the UE which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the call drop receiving level corresponding to the call drop.
In the apparatus, the first determining unit is specifically configured to:
for each level interval, taking the ratio of the number of dropped calls of the level interval to the number of received levels in the level interval as a dropped call probability index of the level interval; or,
for each level interval, taking the ratio of the number of dropped calls of the level interval to the total number of dropped calls as a dropped call probability index of the level interval; or
For each level interval, obtaining the sampling point occupation ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call times occupation ratio of the level interval according to the drop call times/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call times occupation ratio of the level interval/the sampling point occupation ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
In the apparatus, the second determining unit is specifically configured to:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
In the apparatus, the second determining unit is specifically configured to:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
In the apparatus, the second determining unit is further configured to:
and when the call drop probability indexes of the level intervals in which the pre-used switching thresholds are positioned are all smaller than the set probability, selecting the minimum value in the pre-used switching thresholds as the switching threshold.
In the apparatus, the second determining unit is further configured to:
and when the fact that the call drop does not occur within the latest period of time T is determined, selecting the minimum value of a plurality of pre-stored pre-used switching thresholds as a switching threshold.
The method and the device for determining the switching threshold between the systems have the following beneficial effects that: the switching thresholds corresponding to different cells can be determined according to the call drop conditions of the different cells within several hours or even shorter time, so that the switching thresholds of all cell scenes can be obtained, the obtained switching thresholds are more accurate and reliable, manpower and material resources are saved, and the efficiency is high.
Drawings
Fig. 1 is a flowchart of a method for determining an intersystem handover threshold according to an embodiment of the present invention;
fig. 2 is a flowchart of a preferred implementation of determining a handover threshold according to an embodiment of the present invention;
FIG. 3 is a flow chart of a specific implementation provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus for determining a handover threshold according to an embodiment of the present invention.
Detailed Description
The method for determining the intersystem handover threshold according to the present invention is described in more detail with reference to the accompanying drawings and embodiments.
The present invention provides a method for determining an intersystem handover threshold, as shown in fig. 1, including:
Specifically, when a set period is reached or when the current call drop probability index is detected to be excessively large in up-down floating, it is determined that the switching threshold needs to be determined, wherein the set period is preferably one week.
The latest period of time T represents a period of time T before the switching threshold needs to be determined, the period of time T is preferably one week, and the total number of the receiving levels in the period of time T and the value range of the receiving levels in the period of time T can be counted according to the receiving levels in the measurement report of the latest period of time reported by the UE; the drop call receiving level corresponding to each drop call refers to the receiving level corresponding to each drop call when the drop call occurs.
Preferably, the dropped call reception level may be recorded with reference to the occurrence of a dropped call in one call, i.e., the dropped call reception level is recorded once in one call.
The setting step length can be set according to actual conditions, and is preferably set to be 1 dBm.
Specifically, the number of the divided level intervals can be obtained according to the value ranges of all the acquired receiving levels and the set level step length; and counting the total number of the dropped call receiving levels corresponding to all dropped calls to be used as the total number of the dropped calls, wherein the dropped call receiving level corresponding to each dropped call has a level interval to which the dropped call receiving level belongs, counting the number of the telephone receiving levels in each level interval to be used as the dropped call times of the interval, and the dropped call times of each level interval can reflect the dropped call condition of the interval to a certain extent.
And 103, selecting a maximum pre-used switching threshold corresponding to the drop probability index not less than the set probability as a switching threshold or selecting a minimum pre-used switching threshold corresponding to the drop probability index less than the set probability as the switching threshold according to the drop probability indexes of the level intervals in which the pre-stored plurality of pre-used switching thresholds are positioned.
Preferably, the minimum value of the pre-stored pre-used switching thresholds is-103 dBm and the maximum value is-85 dBm.
Preferably, the value of the set probability is 0.02, and may be set to other values according to actual situations such as user perception.
Specifically, a plurality of pre-used switching thresholds are stored in advance, a level interval in which each pre-used switching threshold is located is determined, drop probability indexes which are not smaller than a set probability in the drop probability indexes of the level interval in which each pre-used switching threshold is located are screened out, the largest pre-used switching threshold corresponding to each screened drop probability index is selected as the switching threshold, and therefore the determined switching threshold value can be guaranteed to be as small as possible.
Or, according to the pre-stored dropped call probability indexes of the level intervals in which the plurality of pre-used switching thresholds are located, selecting the minimum pre-used switching threshold corresponding to the dropped call probability index smaller than the set probability as the switching threshold, so that the determined switching threshold can ensure the user experience, the user experience staying in the 3G network system can be better, and when the user experience of accessing the 3G network system is mainly considered, the mode can be selected.
In practical applications, generally, the switching thresholds determined by the two methods can both satisfy the user experience and the user access number.
Based on the above embodiment, when it is determined that a call drop has not occurred within the latest period of time T, the minimum value of the pre-stored pre-used switching thresholds is selected as the switching threshold.
The embodiment of the invention is preferably applied to the cell of which the current network is a 3G network system, the more users staying in the 3G network, the smaller the inter-system switching threshold value is needed, when the call drop does not occur in the cell time T, the signal of the 3G network is relatively stable in the cell scene, and at the moment, the minimum value of a plurality of pre-used switching thresholds stored in advance can be used as the switching threshold, so that more users can use the 3G network.
Based on the above embodiments, each time a call drop occurs, recording a call drop time and a UE identity of the call drop occurs, and acquiring a receiving level corresponding to each call drop occurring within a recent period of time T, specifically including:
and searching the UE measurement report which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the corresponding call drop receiving level when the call is dropped.
Specifically, for each call drop, recording the call drop time and the UE identifier where the call drop occurs, searching for the measurement report of the UE that is closest to the call drop time of the call drop and within a set time period before the call drop time of the call drop, and taking the reception level in the searched measurement report as the call drop reception level corresponding to the call drop.
Therefore, the drop call receiving level corresponding to each drop call can be found, and the occurrence of the drop call of the UE and the measurement report reported by the UE before the drop call are ensured to be in the same cell.
Further preferably, when detecting that the cell where the UE that has dropped the call is different from the cell where the found measurement report UE closest to the dropped call is located, the drop call reception level corresponding to the dropped call is discarded, so that it can be ensured that the drop call corresponding to the obtained drop call reception level occurs in the cell for which the handover threshold needs to be determined.
The set time period may be, but is not limited to, 25 seconds, or other values, and the specific value may be determined according to actual conditions.
Based on the above embodiment, there are various ways to determine the drop probability index of each level interval according to the drop frequency of each interval, which specifically include:
in the method 1, for each level interval, the ratio of the number of dropped calls in the level interval to the number of received levels in the level interval is used as the dropped call probability index of the level interval.
Mode 2, regarding each level section, taking the ratio of the number of dropped calls of the level section to the total number of dropped calls as the dropped call probability index of the level section, wherein the total number of dropped calls is the sum of the number of dropped calls of all the level sections.
Mode 3, for each level interval, obtaining the sampling point ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call frequency ratio of the level interval according to the drop call frequency/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call frequency ratio of the level interval/the sampling point ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
In the three manners, after the ratio is calculated, the ratio is multiplied by 100%, and the calculated percentage is used as the call drop probability index, and at this time, the value of the set probability is preferably 2%.
The drop call probability indexes of each interval calculated by the mode 1 and the mode 2 can reflect the drop call condition of each interval to a certain extent, but the two modes cannot accurately reflect the drop call condition of each interval, the mode 1 considers the drop call times of each level interval and the number of receiving levels of the level interval, but the distribution conditions of the receiving levels in each interval are different, the number of the receiving levels in the interval with more drop call times is very small, and the number of the receiving levels in the interval with less drop call times is very large, so that the calculated drop call probability indexes are not accurate and reliable enough, the mode 2 only considers the drop call times, and similarly, the receiving level distributions in each level interval are different, and the drop call condition of each interval cannot be comprehensively reflected, the mode 3 comprehensively considers the drop call times and the number of the receiving levels of each interval, for each level interval, the percentage of dropped call times in the level interval is calculated firstly, and then the percentage of received levels in the interval, namely the percentage of sampled points, is calculated, the dropped call probability index of each level interval can be obtained according to different dropped call times and the number of received levels in different level intervals, and the obtained dropped call probability index is accurate and reliable.
Based on the above embodiment, according to the pre-stored drop call probability indexes of the level intervals in which the multiple pre-used switching thresholds are located, selecting the maximum pre-used switching threshold corresponding to the drop call probability index not less than the set probability as the switching threshold, or selecting the minimum pre-used switching threshold corresponding to the drop call probability index less than the set probability as the switching threshold specifically includes:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
Therefore, the over-finding operation can be stopped when the required pre-used switching threshold is found, and the speed of determining the switching threshold is improved.
Specifically, the implementation process is shown in fig. 2, and includes:
Based on the above embodiment, according to the pre-stored drop call probability indexes of the level intervals in which the multiple pre-used switching thresholds are located, selecting the maximum pre-used switching threshold corresponding to the drop call probability index not less than the set probability as the switching threshold specifically includes:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
The set value can be set according to the actual situation, is preferably 1dBm, and is the same as the set step length for dividing the level interval, so that the call drop probability index of the level interval in which the pre-used switching threshold is positioned, the call drop probability indexes of the level intervals in which the two pre-used switching thresholds adjacent to the pre-used switching threshold are positioned and the average value of the three call drop probability indexes can be obtained, and the average value mode can enable the call drop probability index corresponding to one pre-used switching threshold to be more accurate and reliable, and further enable the obtained switching threshold to be more accurate.
In addition, when there are two level intervals in which one of the pre-used switching thresholds is located, there is a problem that it is not possible to determine which interval the drop probability index corresponding to the pre-used switching threshold is taken as the drop probability index, the drop probability indexes of the level intervals in which the level values before and after the pre-used switching threshold are located are taken as the drop probability indexes, and at this time, the average value of the drop probability indexes of the level intervals in which the level values before and after the pre-used switching threshold are located is taken as the drop probability index corresponding to the pre-used switching threshold, so that the problem can be solved.
The specific implementation process of the embodiment of the present invention is similar to that of the method 1, and is not described herein again.
In practical applications, there is a trend to: the larger the value of the pre-use threshold is, the smaller the drop probability index of the level interval in which the pre-use threshold is located is, the embodiment of the present invention compares the drop probability index of the level interval in which each pre-use switching threshold is located with the set probability from the maximum value of the pre-use threshold, that is, from the minimum drop probability index of the level interval in which each pre-use switching threshold is located, if the drop probability index of the level interval in which one pre-use switching threshold is located is not less than the set probability, it indicates that the drop probability index of the level interval in which the pre-use switching threshold is located after the pre-use switching threshold is also not less than the set probability, and in order to ensure user experience, when it is determined for the first time that the drop probability index of the level interval in which the pre-use switching threshold is located is not less than the set probability.
Based on the above embodiment, when it is determined that the dropped call probability indexes of the level intervals in which the pre-used switching thresholds are located are all smaller than the set probability, the minimum value of the pre-used switching thresholds is selected as the switching threshold.
In this way, when no call drop occurs within the last period of time T, in order to ensure that more users stay in the 3G network, the minimum value of the pre-used handover thresholds stored in advance is used as the handover threshold.
In addition, the following method can be adopted to determine the switching threshold:
according to the pre-stored drop call probability indexes of the level intervals where the plurality of pre-used switching thresholds are located, sequentially performing the following accumulation operation from the maximum value (the 1 st pre-used switching threshold) in the plurality of pre-used switching thresholds to determine the switching threshold according to the sequence from large to small:
judging whether the sum of the drop probability indexes of the level intervals where the first N pre-use switching thresholds are located in the plurality of pre-use switching thresholds is not less than a set probability, wherein N is more than or equal to 1 and is less than or equal to the number of the plurality of pre-use switching thresholds stored in advance;
if yes, the Nth pre-used switching threshold is used as the switching threshold.
When the call drop probability indexes of the level intervals in which the pre-used switching thresholds are located are all smaller than the set probability, the call drop probability of the level intervals in which the pre-used switching thresholds are located is smaller, and at this time, in order to enable more users to be switched to the 3G network, the minimum value of the pre-used switching thresholds is selected as the switching threshold.
The following describes a method for determining an intersystem handover threshold according to an embodiment of the present invention with reference to a specific implementation manner, as shown in fig. 3, including:
step 301, when a set period is reached, determining that a handover threshold needs to be determined, and obtaining a receiving level in a measurement report reported by the UE within a latest period of time T and a dropped call receiving level corresponding to each dropped call occurring within the latest period of time T.
Specifically, call data of a user in a recent period of time T may be acquired, where the call data includes various services (such as circuit domain service and packet domain service) and MR (Measurement Report) data of the user, the MR data includes a main serving cell reception level and an adjacent cell reception level, and when a handover threshold of which cell is determined, the cell is taken as a main serving cell, and the reception level of the main serving cell is further acquired.
When a receiving level corresponding to each call drop occurring in a latest period of time T is obtained, taking the call drop occurring in a call as a reference, if the call drop occurs in the call, obtaining a call drop signaling of the call drop, wherein the call drop signaling comprises a timestamp for recording the call drop time when the UE drops and a cell identifier of a main service cell where the UE is located when the UE drops; simultaneously acquiring a measurement report signaling of the UE closest to the call drop time of the call drop, wherein the measurement report signaling comprises a timestamp for recording the measurement report time reported by the UE and a cell identifier of a current main service cell needing to determine a switching threshold reported by the UE; and if the cell identifications in the two signaling are the same, further judging whether the time difference recorded by the timestamps in the two signaling is less than 25 seconds (set time period), and if so, acquiring the receiving level which is closest to the call drop time of the call drop and in a set time period in the latest time period T and is in the measurement report of the UE, and taking the receiving level as the call drop receiving level corresponding to the call drop. And counting the number of all the dropped call receiving levels in the time T to be used as the total dropped call number.
And 304, for each level interval, calculating the number of the receiving levels/the total number of the receiving levels in the level interval to obtain the sampling point ratio of the level interval, wherein the total number of the receiving levels is the sum of the number of the receiving levels in all the level intervals.
And 305, for each level interval, calculating the dropped call times/dropped call total number of the level interval to obtain the dropped call times ratio of the level interval, wherein the dropped call times of each level interval is the dropped call receiving level number in each level interval, and the dropped call total number is the sum of the dropped call times of all the level intervals.
And step 306, for each level interval, obtaining the drop call probability index of the level interval according to the drop call frequency ratio of the level interval/the sampling point ratio of the level interval.
Therefore, the call drop probability index of the call drop of the cell under each level value can be counted, the number of the receiving levels can be used as the number of sampling points of the cell, each sampling point represents that a User (UE) stays for a period of time under the receiving level value of the sampling point, and the user perception is reflected by the call drop probability index.
And 307, sequencing the pre-stored multiple pre-used switching thresholds according to a descending order.
In step 308, the maximum value of the plurality of pre-used switching thresholds is first used as a judgment object.
In step 310, calculating the average value of the determined call drop probability indexes in step 309, and determining whether the average value is not less than the set probability, if so, executing step 311, otherwise, executing step 312.
Step 311, the pre-used handover threshold is used as the handover threshold.
And step 313, taking the minimum value of all the pre-used switching thresholds as a switching threshold.
Based on the same inventive concept as the method for determining the inter-system handover threshold provided in the embodiment of the present invention, the present invention further provides an apparatus for determining an inter-system handover threshold, as shown in fig. 4, including:
an obtaining unit 401, configured to obtain, when a handover threshold needs to be determined, a receiving level in a measurement report reported by a UE within a latest time T, and a dropped call receiving level corresponding to each dropped call occurring within the latest time T;
a first determining unit 402, configured to divide all the obtained receiving levels into a plurality of level intervals according to a set level step length, and determine a drop probability index of each level interval according to the drop frequency of each level interval, where the drop frequency of each level interval is the number of drop receiving levels in each level interval;
a second determining unit 403, configured to select, according to the pre-stored drop call probability indexes of the level intervals in which the multiple pre-used switching thresholds are located, a maximum pre-used switching threshold corresponding to the drop call probability index that is not less than a set probability as a switching threshold, or select a minimum pre-used switching threshold corresponding to the drop call probability index that is less than the set probability as a switching threshold.
In the apparatus, the obtaining unit is specifically configured to:
and recording the call drop time and the UE identification of the call drop when the call drop occurs every time, searching the measurement report of the UE which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the call drop receiving level corresponding to the call drop.
In the apparatus, the first determining unit is specifically configured to:
for each level interval, taking the ratio of the number of dropped calls of the level interval to the number of received levels in the level interval as a dropped call probability index of the level interval; or,
for each level interval, taking the ratio of the number of dropped calls of the level interval to the total number of dropped calls as a dropped call probability index of the level interval; or
For each level interval, obtaining the sampling point occupation ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call times occupation ratio of the level interval according to the drop call times/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call times occupation ratio of the level interval/the sampling point occupation ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
In the apparatus, the second determining unit is specifically configured to:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
In the apparatus, the second determining unit is specifically configured to:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
In the apparatus, the second determining unit is further configured to:
and when the call drop probability indexes of the level intervals in which the pre-used switching thresholds are positioned are all smaller than the set probability, selecting the minimum value in the pre-used switching thresholds as the switching threshold.
In the apparatus, the second determining unit is further configured to:
and when the fact that the call drop does not occur within the latest period of time T is determined, selecting the minimum value of a plurality of pre-stored pre-used switching thresholds as a switching threshold.
The method and the device for determining the switching threshold between the systems have the following beneficial effects that: the switching thresholds corresponding to different cells can be determined according to the call drop conditions of the different cells within several hours or even shorter time, so that the switching thresholds of all cell scenes can be obtained, the obtained switching thresholds are more accurate and reliable, manpower and material resources are saved, and the efficiency is high.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. A method for determining an intersystem handover threshold, comprising:
when a switching threshold needs to be determined, acquiring a receiving level in a measurement report reported by UE within a latest period of time T and a dropped call receiving level corresponding to each dropped call occurring within the latest period of time T;
dividing all the obtained receiving levels into a plurality of level intervals according to a set level step length, and determining a drop call probability index of each level interval according to the drop call frequency of each level interval, wherein the drop call frequency of each level interval is the drop call receiving level number in each level interval;
according to the pre-stored drop call probability indexes of the level intervals where the plurality of pre-used switching thresholds are located, selecting the maximum pre-used switching threshold corresponding to the drop call probability index not less than the set probability as the switching threshold, or selecting the minimum pre-used switching threshold corresponding to the drop call probability index less than the set probability as the switching threshold.
2. The method of claim 1, wherein each time a call drop occurs, recording a call drop time and a UE identity of the call drop occurs, and acquiring a reception level corresponding to each call drop occurring within a latest period of time T, specifically comprising:
and searching the UE measurement report which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the corresponding call drop receiving level when the call is dropped.
3. The method of claim 1, wherein determining the drop probability index for each level interval according to the number of drops for each level interval comprises:
for each level interval, taking the ratio of the number of dropped calls of the level interval to the number of received levels in the level interval as a dropped call probability index of the level interval; or,
for each level interval, taking the ratio of the number of dropped calls of the level interval to the total number of dropped calls as a dropped call probability index of the level interval; or
For each level interval, obtaining the sampling point occupation ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call times occupation ratio of the level interval according to the drop call times/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call times occupation ratio of the level interval/the sampling point occupation ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
4. The method according to claim 1, wherein selecting a maximum pre-used handover threshold corresponding to the drop probability index not less than a set probability as the handover threshold or selecting a minimum pre-used handover threshold corresponding to the drop probability index less than the set probability as the handover threshold according to the drop probability indexes of the level intervals in which the pre-stored multiple pre-used handover thresholds are located, specifically includes:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
5. The method according to claim 1, wherein the selecting, according to the pre-stored drop probability indexes of the level intervals in which the plurality of pre-used switching thresholds are located, the maximum pre-used switching threshold corresponding to the drop probability index not less than the set probability as the switching threshold specifically includes:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
6. The method of any of claims 1 to 5, further comprising:
and when the call drop probability indexes of the level intervals in which the pre-used switching thresholds are positioned are all smaller than the set probability, selecting the minimum value in the pre-used switching thresholds as the switching threshold.
7. The method of claim 1, further comprising:
and when the fact that the call drop does not occur within the latest period of time T is determined, selecting the minimum value of a plurality of pre-stored pre-used switching thresholds as a switching threshold.
8. An apparatus for determining an intersystem handover threshold, comprising:
an obtaining unit, configured to obtain, when a handover threshold needs to be determined, a reception level in a measurement report reported by a UE within a latest time T, and a dropped call reception level corresponding to each dropped call occurring within the latest time T;
the first determining unit is used for dividing all the acquired receiving levels into a plurality of level intervals according to a set level step length, and determining the drop probability index of each level interval according to the drop frequency of each level interval, wherein the drop frequency of each level interval is the drop receiving level number in each level interval;
and the second determining unit is used for selecting a maximum pre-used switching threshold corresponding to the drop probability index which is not less than the set probability as the switching threshold or selecting a minimum pre-used switching threshold corresponding to the drop probability index which is less than the set probability as the switching threshold according to the drop probability indexes of the level intervals in which the pre-stored multiple pre-used switching thresholds are positioned.
9. The apparatus of claim 8, wherein the obtaining unit is specifically configured to:
and recording the call drop time and the UE identification of the call drop when the call drop occurs every time, searching the measurement report of the UE which is closest to the call drop time and in a set time period before the call drop time, and determining the receiving level in the searched measurement report as the call drop receiving level corresponding to the call drop.
10. The apparatus of claim 8, wherein the first determining unit is specifically configured to:
for each level interval, taking the ratio of the number of dropped calls of the level interval to the number of received levels in the level interval as a dropped call probability index of the level interval; or,
for each level interval, taking the ratio of the number of dropped calls of the level interval to the total number of dropped calls as a dropped call probability index of the level interval; or
For each level interval, obtaining the sampling point occupation ratio of the level interval according to the number of receiving levels/the total number of receiving levels in the level interval, obtaining the drop call times occupation ratio of the level interval according to the drop call times/the total number of drop calls of the level interval, and obtaining the drop call probability index of the level interval according to the drop call times occupation ratio of the level interval/the sampling point occupation ratio of the level interval;
the total number of dropped calls is the sum of dropped call times of all the level intervals, and the total number of receiving level numbers is the sum of receiving level numbers of all the level intervals.
11. The apparatus of claim 8, wherein the second determining unit is specifically configured to:
according to the sequence from big to small, starting from the maximum value in the plurality of pre-used switching thresholds, the following steps are sequentially executed until the switching threshold is determined:
judging whether the drop call probability index of the level interval in which the pre-used switching threshold is positioned is not less than the set probability;
if yes, the pre-used switching threshold is used as a switching threshold, or the pre-used switching threshold which is one of the pre-used switching thresholds is used as a switching threshold.
12. The apparatus of claim 8, wherein the second determining unit is specifically configured to:
according to the sequence from big to small, the following steps are sequentially executed from the maximum value in the plurality of pre-used switching thresholds to determine the switching threshold:
determining a dropped call probability index of a level interval in which a pre-used switching threshold is positioned, a dropped call probability index of a level interval in which a set value is added to the switching threshold, and a dropped call probability index of a level interval in which the set value is subtracted from the switching threshold;
calculating the average value of the three determined drop call probability indexes, and judging whether the average value is not less than the set probability;
and if so, taking the pre-used switching threshold as a switching threshold.
13. The apparatus according to any of claims 8 to 12, wherein the second determining unit is further configured to:
and when the call drop probability indexes of the level intervals in which the pre-used switching thresholds are positioned are all smaller than the set probability, selecting the minimum value in the pre-used switching thresholds as the switching threshold.
14. The apparatus of claim 8, wherein the second determination unit is further to:
and when the fact that the call drop does not occur within the latest period of time T is determined, selecting the minimum value of a plurality of pre-stored pre-used switching thresholds as a switching threshold.
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