CN107948447B - Method and device for detecting call drop rate - Google Patents
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- CN107948447B CN107948447B CN201711397702.8A CN201711397702A CN107948447B CN 107948447 B CN107948447 B CN 107948447B CN 201711397702 A CN201711397702 A CN 201711397702A CN 107948447 B CN107948447 B CN 107948447B
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- 238000007726 management method Methods 0.000 description 5
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- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2218—Call detail recording
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The embodiment of the invention provides a method and a device for detecting a call drop rate, wherein the method comprises the following steps: aiming at each call in the system, acquiring first call time of a calling side and second call time of a called side; determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system; and calculating the call drop rate of the system according to the call times and the call connection times in the system. The method and the device provided by the embodiment of the invention can accurately determine the call drop rate of the system and provide accurate data reference for system maintenance.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for detecting a call drop rate.
Background
The mobile communication system has been developed from the first generation system to the fourth generation system (4G), and is currently evolving to the 4G + system, and there are operators who have deployed a test network of the fifth generation system and plan to formally deploy the fifth generation system. No matter how the system evolves, the current voice service is still the core service of the mobile communication network, and the quality of the voice service is a key factor influencing the quality evaluation of the mobile communication network by the user.
The quality of the voice service can be obtained through a network management system and also can be obtained through a drive test mode, and main evaluation indexes comprise an access success rate, a Mean Opinion (MOS) value of the voice service, a call drop rate and the like. The reason is that once a call drop is interrupted after a call of a user is successfully established, the user can feel a strong dislike emotion and cause complaints, and the user who frequently encounters the call drop has a risk of leaving the network. Therefore, the call drop rate of the voice service is a key index reflecting user perception and network quality, and how to accurately evaluate the call drop rate of the system is very important.
Disclosure of Invention
The embodiment of the invention provides a call drop rate detection method and device, which are used for accurately evaluating the call drop rate in a mobile communication system.
A first aspect of an embodiment of the present invention provides a method for detecting a dropped call rate, where the method includes:
aiming at each call in the system, acquiring first call time of a calling side and second call time of a called side;
determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
and calculating the call drop rate of the system according to the call times and the call connection times in the system.
Optionally, the obtaining the first call time of the calling side and the second call time of the called side includes:
the method comprises the steps of obtaining a first time length from the successful call establishment to the call completion of a calling side, and obtaining a second time length from the successful call establishment to the call completion of a called side.
Optionally, the obtaining the first call time of the calling side and the second call time of the called side includes:
the method comprises the steps of obtaining a first time of a calling side call ending time and obtaining a second time of a called side call ending time.
Optionally, the method further includes:
and setting the preset threshold as the duration of the bearer release of the wireless side in the system or the duration of the bearer release of the core network side in the system.
Optionally, the method further includes:
and setting the preset threshold as the minimum value of the duration of the wireless side bearer release in the system and the duration of the core network side bearer release in the system or the sum of the two.
A second aspect of the embodiments of the present invention provides a dropped call evaluation apparatus, including:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring first call time of a calling side and second call time of a called side aiming at each call in the system;
the determining module is used for determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
and the calculating module is used for calculating the call drop rate of the system according to the call times and the call connection times in the system.
Optionally, the obtaining module includes:
the first obtaining submodule is used for obtaining a first time length from the successful call establishment to the call termination of the calling side and obtaining a second time length from the successful call establishment to the call termination of the called side.
Optionally, the obtaining module includes:
and the second obtaining submodule is used for obtaining the first time of the call ending time of the calling side and obtaining the second time of the call ending time of the called side.
Optionally, the apparatus further comprises:
a first setting module, configured to set the preset threshold as a duration of bearer release at a radio side in the system or a duration of bearer release at a core network side in the system.
Optionally, the apparatus further comprises:
and the second setting module is used for setting the preset threshold value as the minimum value or the sum of the duration of the bearer release of the wireless side in the system and the duration of the bearer release of the core network side in the system.
Based on the above aspects, the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the call drop rate of the system is calculated by acquiring the first call time of the calling side and the second call time of the called side in each call in the system, determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side in the system is greater than the preset threshold value and according to the determined number of calls and the number of call-on times of the calling side in the system. Therefore, the problem of inaccurate dropped call statistics caused by the incoordination between the network side setting and the signaling dropped call definition in the conventional system can be solved, and the accuracy of dropped call rate detection is improved. In addition, the embodiment of the invention does not need to count the call drop times of the system through drive test, thereby overcoming the limitations of the prior art on time and space.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a call drop rate detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dropped call evaluation apparatus according to an embodiment of the present invention.
Detailed Description
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 "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover non-exclusive inclusions, e.g., a process or an apparatus that comprises a list of steps is not necessarily limited to those structures or steps expressly listed but may include other steps or structures not expressly listed or inherent to such process or apparatus.
The prior art method for detecting the call drop rate of a mobile communication system (hereinafter referred to as system) includes the following steps:
in one detection mode, the number of dropped calls of the system can be counted through the signaling of the drive test, and the dropped call rate of the system can be calculated according to the number of dropped calls of the system.
Specifically, the definition of the prior art for the drive test signaling drop call is as follows: after the call is successfully established, the terminal returns to an idle state or receives a disconnection (Disconnect) signaling message, a Release (Release) signaling message or a Release Complete (Release Complete) signaling message under the condition that the terminal does not receive the disconnection (Disconnect) signaling message, the Release (Release) signaling message or the Release Complete signaling message, but the reason value is abnormal, and the signaling drop call is counted as one signaling drop call.
After the signaling dropped call times of the system are obtained, according to the expression: and calculating the call drop rate of the system by the signaling call drop times, the connection times and 100%.
In another detection mode, the number of times of signaling dropped calls of the system can be determined by the network management side.
Specifically, the definition of the prior art for the signaling drop at the network management side is as follows: a Radio Network Controller (RNC) sends a "Radio access bearer RELEASE REQUEST" signaling message and an "IU connection RELEASE REQUEST" signaling message to a CN, and after that, the RNC receives the "IU connection RELEASE COMMAND" (IU RELEASE COMMAND) signaling message sent by the CN, it counts as a signaling drop call.
After the signaling dropped call times of the system are obtained, according to the expression: and calculating the call drop rate of the system by the signaling call drop times, the connection times and 100%.
In another detection mode, the dropped call times of the system can be counted through the voice MOS value obtained by the drive test, and then the dropped call rate of the system can be calculated according to the dropped call times of the system.
Specifically, it is defined in the prior art that if a sampling point whose MOS value is less than or equal to 2.5 times continuously occurs, a call drop is considered to have occurred.
In this detection mode, according to the expression: and calculating the call drop rate of the system according to the call drop times/turn-on times.
However, there is a drawback in the method for obtaining the dropped call times through signaling analysis, if the action mechanism of the core network side or other network elements can make the terminal have abnormal dropped call, the situation specified in the signaling dropped call definition does not occur, that is, the terminal returns to idle state or receives "Disconnect" signaling message, "Release" signaling message, or "Release Complete" signaling message under the condition that the terminal does not receive "Disconnect" signaling message, "Release" signaling message, or "Release Complete" signaling message after the call is successfully established, but the reason value is abnormal, then the statistics of dropped call times during the road test will be reduced, correspondingly, if the flow of "RAB Release" signaling message sent to the CN or "IU Release REQUEST" signaling message sent by the RNC to the CN does not occur, the dropped call times captured by the network management side will also be reduced, this results in an inaccurate final calculated dropped call rate.
Although the initial purpose of the design of statistically counting the number of dropped calls through the MOS value of the drive test is to reflect the user's perception of the voice service quality, the MOS value is not really felt by the user after all, and the MOS value lower than 2.5 is taken as the standard for dropped calls, which is not really dropped calls but only conceptually dropped calls. In addition, generally, a sound segment with a certain time duration is adopted for the MOS value test, and the condition of a period of time is reflected rather than the condition of accurately reflecting a call drop point when the MOS value is low. The MOS value can only be collected in the drive test, and therefore, the drive test technology itself has limitations in time and space.
In view of the foregoing problems in the prior art, an embodiment of the present invention provides a method for detecting a dropped call rate, where the method is applicable to a second-generation communication system, a third-generation communication system, a fourth-generation communication system, and a situation where a future communication system carries a voice service. The method may be performed by a call drop rate detection device (hereinafter referred to as an evaluation device). Alternatively, the evaluation apparatus may be embodied as a server on the network side, or a controller disposed in the server on the network side, where the controller includes a processor and a memory, and the memory stores program instructions executable by the processor, and when the processor executes the program instructions, the call drop rate detection method of the embodiment is performed. Referring to fig. 1, fig. 1 is a flowchart of a method for detecting a call drop rate according to an embodiment of the present invention, as shown in fig. 1, the method includes:
In this embodiment, the first call time of the calling side and the second call time of the called side may be extracted from a network management side of the system, or extracted from call records of the calling user and the called user.
The acquiring of the first call time of the calling side and the second call time of the called side related in the embodiment includes:
the method comprises the steps of obtaining a first time length from the successful call establishment to the call completion of a calling side, and obtaining a second time length from the successful call establishment to the call completion of a called side. Or, acquiring a first time of the call ending time of the calling side and acquiring a second time of the call ending time of the called side.
And 102, determining the number of calls in the system, wherein the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value.
In a first possible implementation manner, if the first time length T1 from the successful call establishment to the call end of the calling side and the second time length T2 from the successful call establishment to the call end of the called side are obtained, then if T1 and T2 satisfy the condition: if the value of T1-T2 is larger than sigma, the call drop between the calling party and the called party can be determined. Wherein σ is a preset threshold value.
In a second possible implementation manner, if the first time t1 of the end time of the calling side call and the second time t2 of the end time of the called side call are obtained, if t1 and t2 satisfy the condition: if t1-t2 is greater than sigma, the call drop between the calling party and the called party can be determined.
In the present embodiment, the preset threshold σ is a number greater than or equal to zero in units of time, but considering the factor of the system time recording error, it is considered that a larger value is appropriately adopted. The setting method comprises the following steps:
in one possible setting method, the preset threshold may be arbitrarily set to a number greater than or equal to zero as needed.
In another possible setting method, the preset threshold may be set as a duration required for releasing a radio bearer in the system, or a duration required for releasing a core network bearer in the system.
The duration required for bearer release on the radio side as referred to herein is determined mainly by the principle and flow of the radio side equipment and the set relevant parameters (which may be associated with the core network equipment), and is the length of time required for bearer release on the radio side when an abnormality occurs on one or both of the voice calls. The time length affects the time length of the call between the calling party and the called party recorded by the system, so that the time lengths of the calling party and the called party are different; or the system will influence the respective call ending time of the calling party and the called party, which causes the difference between the call ending time of the calling party and the call ending time of the called party.
The duration required for bearer release on the core network side is determined mainly by the principle and flow of the device on the core network side and the set related parameters (which may also be associated with the device on the wireless side), and when one or both of the voice calls are abnormal, the duration required for bearer release on the core network side is the length of time required. The time length affects the time length of the call between the calling party and the called party recorded by the system, so that the time lengths of the calling party and the called party are different; or the system will influence the respective call ending time of the calling party and the called party, which causes the difference between the call ending time of the calling party and the call ending time of the called party.
In yet another possible setting method, the preset threshold may be set as a minimum value or a sum of a duration required by bearer release on the radio side in the system and a duration required by bearer release on the core network side in the system, for example, if the duration required by bearer on the radio side is a (time unit may be second or millisecond), the duration required by bearer release on the core network side is b (time unit may be second or millisecond), and a is smaller than b, the preset threshold may be set as a value or a sum of a and b.
For example, for the third generation communication system, when downlink desynchronization occurs on the air interface of the wireless side, the processing flow of the system is as follows:
when the terminal in the call state continuously receives a first preset number of consecutive out of sync indications from the physical layer, a timer T313 is started.
In this process, if a second preset number of "in sync" indications from the physical layer are continuously received, T313 stops; otherwise, T313 is overtime, and the downlink wireless link is regarded as out-of-step.
After detecting that the downlink wireless link is out of step, the terminal performs the following actions: the radio resource control layer of the terminal sends a 'P _ RRC _ PHY _ RL _ Release _ REQ' instruction message to the physical layer, the physical channel resource is released, the terminal closes the uplink and downlink data to allow the physical layer to perform cell re-search and update, if the cell update is successful, the downlink radio link is out of step to be saved, otherwise, the terminal is dropped.
For the above processing flow, a preset threshold may be set as a timing time value of the timer T313, or a total time for releasing the downlink out-of-step bearer may be obtained through further calculation, and the preset threshold is set as a value of the total time, or a time required for releasing the bearer due to a call drop caused by an uplink out-of-step and a time required for releasing the bearer due to a call drop caused by a downlink out-of-step may be respectively calculated, and a minimum value of the two is set as the preset threshold. It is understood that this is by way of illustration and not by way of limitation.
Considering the core network side again, the action mechanisms of the core network side T305 timer and the core network side T308 timer are mainly involved here, and assuming that the terminal a and the terminal B successfully establish the voice service, the terminal a has an uplink out-of-step abnormality at a certain time, and the user of the terminal B hangs up to initiate a "DISCONNECT" message because the user cannot hear the sound. The core network forwards the DISCONNECT message to terminal a and starts the T305 timer. The "Release" message sent back to the core network by terminal a cannot be received by the core network due to uplink out-of-synchronization. After T305 times out, T305 stops and the core network sends a "RELEASE" message to terminal a and starts T308. The core network cannot receive the "RELEASE COMPLETE" message of terminal a due to the uplink loss of synchronization of terminal a. After the first time T308 times out, T308 restarts timing, and the core network resends the "RELEASE" message to terminal a. And after the second time T308 is overtime, the T308 stops timing, and the core network side actively initiates the connection release.
In this case, the preset threshold may be set as "T305 +2 × T308" of the time required by the core network side to release the bearer, and this example is only the preset threshold that may be adopted in consideration of the listed example, and of course, the preset threshold may be further accurately calculated according to actual requirements. For example, the preset threshold may be set as the minimum value of the time required by the radio side to release the bearer and the time required by the core network side to release the bearer, and a call satisfying the condition of | t1-t2| > σ is defined as a dropped call, so that the dropped call times of the whole network may be obtained, and further the dropped call rate statistics of the whole network may be obtained.
Of course, the above examples are merely illustrative and not the only limitations of the present invention.
And 103, calculating the call drop rate of the system according to the call times and the call connection times in the system.
In this embodiment, after obtaining the number of times of call in which the absolute value of the difference between the first call time of the calling side and the second call time of the called side in the system is greater than the preset threshold, that is, the number of times of call drop, according to the expression: and calculating the call drop rate of the system according to the call drop times/turn-on times.
In this embodiment, the call drop rate of the system is calculated by acquiring the first call time of the calling side and the second pass time of the called side in each call in the system, determining the number of calls in which the absolute value of the difference between the first call time of the calling side and the second call time of the called side in the system is greater than a preset threshold, and according to the determined number of calls and the number of call-on times of the calling side in the system. Therefore, the problem of inaccurate dropped call statistics caused by the incoordination between the network side setting and the signaling dropped call definition in the conventional system can be solved, and the accuracy of dropped call rate detection is improved. In addition, the embodiment does not need to count the dropped call times of the system through drive tests, so that the limitation of the prior art on time and space is overcome.
Fig. 2 is a schematic structural diagram of a dropped call evaluation apparatus according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes:
the obtaining module 11 is configured to obtain, for each call in the system, first call time of a calling side and second call time of a called side;
a determining module 12, configured to determine a number of calls in the system, where an absolute value of a difference between a first call time of a calling side and a second call time of a called side is greater than a preset threshold;
and the calculating module 13 is used for calculating the call drop rate of the system according to the call times and the call connection times in the system.
Optionally, the obtaining module 11 includes:
the first obtaining submodule is used for obtaining a first time length from the successful call establishment to the call termination of the calling side and obtaining a second time length from the successful call establishment to the call termination of the called side.
Optionally, the obtaining module 11 includes:
and the second obtaining submodule is used for obtaining the first time of the call ending time of the calling side and obtaining the second time of the call ending time of the called side.
Optionally, the apparatus further comprises:
a first setting module, configured to set the preset threshold as a duration of bearer release at a radio side in the system or a duration of bearer release at a core network side in the system.
Optionally, the apparatus further comprises:
and the second setting module is used for setting the preset threshold value as the minimum value or the sum of the duration of the bearer release of the wireless side in the system and the duration of the bearer release of the core network side in the system.
The device provided by the embodiment of the present invention can be used to execute the method of the embodiment of fig. 1, and the execution mode and the beneficial effect are similar, which are not described herein again.
In an exemplary embodiment, there is also provided a dropped call evaluation apparatus comprising a processor and a memory for storing executable instructions of the processor, which when executed by the processor performs the method of:
aiming at each call in the system, acquiring first call time of a calling side and second call time of a called side;
determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
and calculating the call drop rate of the system according to the call times and the call connection times in the system.
In this embodiment, the call drop rate of the system is calculated by acquiring the first call time of the calling side and the second call time of the called side in each call in the system, determining the number of calls in which the absolute value of the difference between the first call time of the calling side and the second call time of the called side in the system is greater than a preset threshold, and according to the determined number of calls and the number of call-on times of the calling side in the system. Therefore, the problem of inaccurate dropped call statistics caused by the incoordination between network setting and signaling dropped call definition in the conventional system can be solved, and the accuracy of dropped call rate detection is improved. In addition, the embodiment does not need to count the dropped call times of the system through drive tests, so that the limitation of the prior art on time and space is overcome.
In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided that includes instructions, such as a memory, that are executable by a processor of the dropped call evaluation apparatus to perform the method described above. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
A non-transitory computer readable storage medium having instructions therein which, when executed by a processor of a dropped call evaluation apparatus, enable the dropped call evaluation apparatus to perform a method comprising:
aiming at each call in the system, acquiring first call time of a calling side and second call time of a called side;
determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
and calculating the call drop rate of the system according to the call times and the call connection times in the system.
Finally, it should be noted that, as one of ordinary skill in the art will appreciate, all or part of the processes of the methods of the embodiments described above may be implemented by hardware related to instructions of a computer program, where the computer program may be stored in a computer-readable storage medium, and when executed, the computer program may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for detecting a dropped call rate includes:
aiming at each call in the system, acquiring first call time of a calling side and second call time of a called side;
determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
calculating the call drop rate of the system according to the call times and the call connection times in the system;
the acquiring of the first call time of the calling side and the second call time of the called side includes:
acquiring a first time length from the successful call establishment to the call completion of a calling side and a second time length from the successful call establishment to the call completion of a called side;
the acquiring of the first call time of the calling side and the second call time of the called side includes:
the method comprises the steps of obtaining a first time of a calling side call ending time and obtaining a second time of a called side call ending time.
2. The method of claim 1, further comprising:
and setting the preset threshold as the duration of the bearer release of the wireless side in the system or the duration of the bearer release of the core network side in the system.
3. The method of claim 2, further comprising:
and setting the preset threshold as the minimum value of the duration of the wireless side bearer release in the system and the duration of the core network side bearer release in the system or the sum of the two.
4. A dropped call evaluation apparatus, comprising:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring first call time of a calling side and second call time of a called side aiming at each call in the system;
the determining module is used for determining the number of calls of which the absolute value of the difference between the first call time of the calling side and the second call time of the called side is greater than a preset threshold value in the system;
the calculating module is used for calculating the call drop rate of the system according to the call times and the call connection times in the system;
the acquisition module includes:
the first obtaining submodule is used for obtaining a first time length from the successful call establishment to the call termination of the calling side and obtaining a second time length from the successful call establishment to the call termination of the called side;
the acquisition module includes:
and the second obtaining submodule is used for obtaining the first time of the call ending time of the calling side and obtaining the second time of the call ending time of the called side.
5. The apparatus of any of claim 4, further comprising:
a first setting module, configured to set the preset threshold as a duration of bearer release at a radio side in the system or a duration of bearer release at a core network side in the system.
6. The apparatus of any one of claims 4 or 5, further comprising:
and the second setting module is used for setting the preset threshold value as the minimum value or the sum of the duration of the bearer release of the wireless side in the system and the duration of the bearer release of the core network side in the system.
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