CN109413701B - VoLTE service switching method and system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
- G10L25/60—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination for measuring the quality of voice signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The invention provides a VoLTE service switching method, which comprises the following steps: s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells; and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching. According to the VoLTE service switching method and system provided by the invention, the voice quality of the user is detected at the network side, so that the user is controlled to switch to the cell with better voice perception, and the problem of user perception degradation is avoided to the maximum extent.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a VoLTE service switching method and system.
Background
Handover (handover) is an indispensable important function of a mobile communication system, and particularly refers to a function of switching a communication channel from one wireless channel to another wireless channel in the process of mobile communication on the premise of ensuring uninterrupted communication. Generally, a handover is triggered when a mobile station moves from one coverage area of a base station to another or when the communication quality is degraded due to external interference or other reasons.
In the LTE network, a Mobile Assisted Handover (MAHO) strategy is adopted in the prior art, that is, the network requires the mobile station to measure the surrounding signal strength and report the measured signal strength to the network side according to a certain rule, and the network side performs judgment according to the measurement result of the mobile station. The specific process can be divided into 3 steps of measurement, decision and execution. The measurement is divided into two processes of measurement control issuing and measurement report reporting, the measurement control is that a network side issues to a User (UE) side, a measurement type and a reporting rule of the UE are specified, a specific measurement control message type and message carrying content information are specified in a document 3GPP TS 36.331, a measurement type in an LTE system such as Reference Signal Received Power (RSRP), LTE Reference Signal Received Quality (RSRQ) and the like is specified in a 3GPP TS 36.214, the UE performs measurement according to the requirement of the measurement control, and a measurement report is uploaded to the network side when the reporting rule is met. The handover decision is performed for a measurement report reported by the UE, and 7 event report types in the LTE system are specified in document 3GPP TS 36.331, and are divided into two categories: different event report combinations can be selected according to actual conditions in the LTE system and between the LTE systems, and different switching algorithms are constructed. The handover execution considers the downward compatibility of the LTE system, which should support not only intra-system handover but also inter-system handover at the same time, and a corresponding handover procedure is specified in 3GPP TS 36.300.
The VoLTE service in the prior art completely inherits the switching policy of the LTE data service, according to the expression of 3GPP TS 36.214, the UE can perform 15 measurements such as RSRP, RSRQ, etc., and the network side can perform 7 measurements such as RS TX power, Routing Information Protocol (RIP), advance Time (TADV), etc., so the existing switching policy can only be designed according to these measurements.
However, the VoLTE service is a multimedia voice network based on the IP transmission technology, and the call quality thereof is not only related to the quality of the wireless environment, but also related to the packet loss rate, the time delay jitter, the handover state, etc. of the VoIP packet, and these indexes directly affect the perception of the VoLTE user, and in the scenario where these indexes are continuously degraded, the problems of user one-way connection, interruption, poor quality, etc. may be caused.
Disclosure of Invention
The present invention provides a VoLTE service switching method and system that overcomes or at least partially solves the above mentioned problems.
According to an aspect of the present invention, there is provided a VoLTE service switching method, including:
s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells;
and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching.
Wherein the method further comprises:
and if the voice quality of the user in the current cell is higher than a first preset threshold value and the wireless signal quality of the user in the current cell is lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching.
Wherein the method further comprises:
when the wireless signal quality of the user in the current cell is lower than a second preset threshold value and the voice quality of the user in the current cell is lower than a first preset threshold value,
if the wireless signal quality of the user in the current cell is detected to be lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching, or
If the voice quality of the user in the current cell is detected to be lower than a first preset threshold value, the adjacent cell with the highest voice quality is selected for switching.
Wherein, step S1 includes:
s11, acquiring the frame error rate and the continuous frame deletion rate of the user in the target cell based on a preset voice quality detection algorithm;
and S12, calculating the voice quality of the user in the target cell based on the frame error rate and the continuous deleting frame rate.
Wherein, step S12 specifically includes:
VQILTE＝A*FERm+B*LFEn+Constsingle_AMR，
wherein, VQILTEFor speech quality, FER is the frame error rate, LFE is the continuous frame erasure rate, Constsingle_AMRA, B, m, n are constants for the coding rate.
Wherein, step S2 includes:
s21, if the voice quality of the user in the current cell is lower than a first preset threshold value, starting a timer;
and S22, in the timing range of the timer, if the voice quality of the user in the current cell is continuously lower than a first preset threshold value, selecting the adjacent cell with the highest voice quality for switching.
After one switching, the next switching is not performed within the preset protection duration.
According to a second aspect of the present invention, there is provided a VoLTE service switching system, including:
the system comprises a VQI module, a voice quality detection module and a voice quality analysis module, wherein the VQI module is used for calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, and the target cell comprises a current cell and a plurality of adjacent cells;
and the switching module is used for selecting the adjacent cell with the highest voice quality to switch if the voice quality of the user in the current cell is lower than a first preset threshold value.
According to a third aspect of the present invention, a computer program product is provided, which includes program codes for executing the VoLTE service switching method described above.
According to a fourth aspect of the invention, there is provided a non-transitory computer readable storage medium storing the computer program as described above.
According to the VoLTE service switching method and system provided by the invention, the voice quality of the user is detected at the network side, so that the user is controlled to switch to the cell with better voice perception, and the problem of user perception degradation is avoided to the maximum extent.
Drawings
Fig. 1 is a flowchart of a VoLTE service switching method according to an embodiment of the present invention;
fig. 2 is a structural diagram of a VoLTE service switching system according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a flowchart of a VoLTE service switching method provided by an embodiment of the present invention, and as shown in fig. 1, the method includes:
s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells;
and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching.
In the prior art, because the VoLTE service completely inherits the switching strategy of the LTE data service, the network environment of the user can only be determined according to the wireless indexes for switching, but the VoLTE service is a multimedia voice network based on the IP transmission technology, the call quality of the VoLTE service is not only related to the quality of the wireless environment, but also related to the packet loss rate, the time delay jitter, the switching state and the like of the VoIP packet, the indexes directly influence the perception of the VoLTE user, and in the scene of continuous degradation of the indexes, the problems of one-way communication, interruption, poor quality and the like of the user can be caused.
Aiming at the problems in the prior art and a large number of cases for analysis, the VoLTE service switching method provided by the invention is additionally provided with a VQI (Voice Quality indicator) index for mixed switching on the basis of the existing wireless index switching, and under the condition that the VQI index is deteriorated, a network side controls to issue an emergency switching command and controls a user to switch to a cell with better VQI in an adjacent cell.
Specifically, in S1, the preset voice quality detection algorithm is an algorithm included in a VQI module added to a network management entity or a base station on a network side, and information interaction of the VQI module is implemented through an X2 interface and an S1 interface, where the added VQI module can detect indexes such as a packet loss rate, a time delay, and a time delay jitter of a VoIP packet;
and inputting the uplink and downlink detection results into the VQI model, and outputting the uplink and downlink air interface voice quality. The voice quality is used for the statistics of the relevant performance indexes of the cell-level voice quality and the performance monitoring of the user level, and is output through the network management indexes.
It can be understood that, the VQI value calculation process of the VQI model is directed to one cell, and the solution provided in the embodiment of the present invention stores a plurality of VQI values of the user in the current cell and the neighboring cells at the same time when the network side is going to calculate.
In S2, it is understood that when the calculated VQI value does not satisfy the first preset threshold, the handover is performed. The first preset threshold is a voice quality judging threshold set according to the historical data of the voice quality, the VQI value higher than the threshold can be regarded that the voice quality meets the requirement, and the VQI value lower than the threshold can be regarded that the voice quality does not meet the requirement.
It can be understood that, when the VQI value of the user in the current cell is lower than the preset threshold, that is, the voice quality does not meet the requirement, it can be determined that the user needs to perform handover at this time, and then the neighboring cell with the higher VQI value is selected for handover.
And if all the VQI values of all the adjacent cells are lower than a preset threshold value, selecting the cell with the highest VQI value from the current cell and the adjacent cells for switching.
According to the VoLTE service switching method and system provided by the invention, the voice quality of the user is detected at the network side, so that the user is controlled to switch to the cell with better voice perception, and the problem of user perception degradation is avoided to the maximum extent.
On the basis of the above embodiment, the method further includes:
and if the voice quality of the user in the current cell is higher than a first preset threshold value and the wireless signal quality of the user in the current cell is lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching.
It can be understood that the VoLTE service switching method provided in the embodiment of the present invention is a method that is added on the basis of the switching based on the radio signal quality in the prior art, and thus the radio signal quality of the user needs to be determined while the voice quality of the user is determined, and if the radio signal quality of the user is lower than the second preset threshold, a cell meeting the radio signal quality is selected for switching according to the switching method in the prior art.
It can be understood that, in the embodiment of the present invention, two switching conditions are considered simultaneously in a parallel manner of two switching modes: if the handover is based on the quality of the wireless signal, the target cell is a cell of which the wireless environment reported by the user meets the handover condition, and if the handover is based on the VQI, the target cell is a target cell searched by the VQI module.
On the basis of the above embodiment, the method further includes:
when the wireless signal quality of the user in the current cell is lower than a second preset threshold value and the voice quality of the user in the current cell is lower than a first preset threshold value,
if the wireless signal quality of the user in the current cell is detected to be lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching, or
If the voice quality of the user in the current cell is detected to be lower than a first preset threshold value, the adjacent cell with the highest voice quality is selected for switching.
It can be understood that the foregoing embodiments provide a method for performing handover when only one of the two handover methods satisfies the condition, and the embodiments of the present invention herein provide a handover method when both handover methods satisfy the condition.
It should be noted that, in the handover based on the radio signal quality and the handover based on the VQI value provided in the embodiments of the present invention, the handover relationship between the two is a competitive relationship, i.e., the sequence is performed first on the previous side, and there is no priority relationship between the two.
On the basis of the above embodiment, step S1 includes:
s11, acquiring the frame error rate and the continuous frame deletion rate of the user in the target cell based on a preset voice quality detection algorithm;
and S12, calculating the voice quality of the user in the target cell based on the frame error rate and the continuous deleting frame rate.
Wherein, step S12 specifically includes:
VQILTE＝A*FERm+B*LFEn+Constsingle_AMR，
wherein, VQILTEFor speech quality, FER is the frame error rate, LFE is the continuous frame erasure rate, Constsingle_AMRA, B, m, n are constants for the coding rate.
The embodiment of the invention provides a method for calculating a VQI value, which is mainly used for calculating the VQI value of a user at the moment according to an acquired Frame Error Rate (FER) and a continuous frame erasure rate (LFE) index.
Wherein the FER is the primary factor causing the reduction of VQI. The embodiment of the invention is obtained by calculation according to the wrong packet number, the overtime lost packet number and the total packet number of the voice packets.
A nonlinear relation exists between the LFE and the FER, and when the FER is low, the LFE can be ignored.
Specifically, the VQI value can be calculated by the following formula:
VQILTE＝A*FERm+B*LFEn+Constsingle_AMR，
wherein, VQILTEFor speech quality, FER is the frame error rate, LFE is the continuous frame erasure rate, Constsingle_AMRA, B, m, n are constants for the coding rate.
Note that Const issingle_AMRThe maximum value of the VQI is determined, the maximum value is related to the coding rate, A, B, m and n are constants and can be set independently according to different scenes of the current network.
On the basis of the above embodiment, step S2 includes:
s21, if the voice quality of the user in the current cell is lower than a first preset threshold value, starting a timer;
and S22, in the timing range of the timer, if the voice quality of the user in the current cell is continuously lower than a first preset threshold value, selecting the adjacent cell with the highest voice quality for switching.
In S21, the timer is located in the VQI module in the above embodiment, and it can be understood that, if the voice quality of the cell where the user is located is determined to be not good only by detecting the VQI value once, the detection result may not be accurate, and may be only a sudden voice quality problem, so the embodiment of the present invention adds the timer in the VQI module. When the VQI value is below the threshold, a timer is triggered.
In S22, the embodiment of the present invention provides a preset timing range, and if the voice quality of the user in the current cell is continuously lower than the first preset threshold, the neighboring cell with the highest voice quality is selected for handover.
It can be understood that, in the embodiments of the present invention, the issuing process of the handover command based on the VQI is controlled by the threshold and the timing, the VQI module measures and calculates the VQI value of the VoLTE user, when the VQI calculated value of the UE is lower than the set VQI target value, the timer is started, and if the UE voice perception indicator is continuously deteriorated and reaches the time lag, the VQI directly issues the handover command through the network side.
On the basis of the above embodiment, after one switching is performed, the next switching is not performed within the preset protection duration.
It can be understood that the handover is to enable a user to obtain better VoLTE service experience, but frequent handover itself may affect the experience of the user, so the embodiment of the present invention provides a protection mechanism here, so that the frequent handover phenomenon may not occur.
In the method provided by the embodiment of the present invention, after one switching is finished, a protection duration is added, and a second switching cannot be performed within the protection duration, specifically, for example: after the user is switched from the cell a to the cell B by using the VQI-based switching strategy, the user cannot be quickly switched from the cell B to other cells within the protection duration, which includes two scenarios:
1. and the VQI module does not send a switching command based on the VQI to the user any more in a short time, so that the frequent switching based on the VQI of the user is avoided.
2. The cell B does not send the measurement control information based on the wireless quality to the user in a short time, and the user is prevented from frequently switching between two switching mechanisms based on the VQI and the wireless quality.
According to the protection mechanism provided by the embodiment of the invention, frequent switching can be effectively solved, so that the user experience is better.
Fig. 2 is a structural diagram of a VoLTE service switching system according to an embodiment of the present invention, as shown in fig. 2, including:
the VQI module 1 is configured to calculate a voice quality of a user in a target cell based on a preset voice quality detection algorithm, where the target cell includes a current cell and a plurality of neighboring cells;
the switching module 2 is configured to select a neighboring cell with the highest voice quality for switching if the voice quality of the user in the current cell is lower than a first preset threshold.
Specifically, when the VQI module 1 calculates the voice quality of the user in the current cell and the neighboring cell according to the obtained voice information, the handover module 2 determines whether the calculated VQI value is lower than a first preset threshold value according to the calculation result of the VQI module 1, and if the calculated VQI value is lower than the first preset threshold value, selects the neighboring cell with the highest voice quality to handover.
The VoLTE service switching system provided by the embodiment of the invention calculates the voice quality of the user by adding the VQI module at the network side, thereby judging whether the user is in an environment with poor voice quality, if the user is in the environment with poor voice quality, the network side actively initiates switching, and the user is switched to an adjacent cell with good voice quality.
The embodiment of the invention provides a VoLTE service switching system, which comprises: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor calls the program instructions to perform the methods provided by the method embodiments, for example, including: s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells; and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells; and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells; and S2, if the voice quality of the user in the current cell is lower than a first preset threshold, selecting the adjacent cell with the highest voice quality for switching.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A VoLTE service switching method is characterized by comprising the following steps:
s1, calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, wherein the target cell comprises a current cell and a plurality of adjacent cells;
s2, if the voice quality of the user in the current cell is lower than a first preset threshold value, selecting the adjacent cell with the highest voice quality for switching;
if the voice quality of the user in the current cell is higher than a first preset threshold value and the wireless signal quality of the user in the current cell is lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching;
when the wireless signal quality of the user in the current cell is lower than a second preset threshold value and the voice quality of the user in the current cell is lower than a first preset threshold value:
if the wireless signal quality of the user in the current cell is detected to be lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching, or
If the voice quality of the user in the current cell is detected to be lower than a first preset threshold value, the adjacent cell with the highest voice quality is selected for switching.
2. The method according to claim 1, wherein step S1 includes:
s11, acquiring the frame error rate and the continuous frame deletion rate of the user in the target cell based on a preset voice quality detection algorithm;
and S12, calculating the voice quality of the user in the target cell based on the frame error rate and the continuous deleting frame rate.
3. The method according to claim 2, wherein step S12 specifically includes:
VQILTE＝A*FERm+B*LFEn+Constsingle_AMR，
wherein, VQILTEFor speech quality, FER is the frame error rate, LFE is the continuous frame erasure rate, Constsingle_AMRA, B, m, n are constants for the coding rate.
4. The method according to claim 1, wherein step S2 includes:
s21, if the voice quality of the user in the current cell is lower than a first preset threshold value, starting a timer;
and S22, in the timing range of the timer, if the voice quality of the user in the current cell is continuously lower than a first preset threshold value, selecting the adjacent cell with the highest voice quality for switching.
5. The method of claim 1, wherein after one handover, the next handover is not performed within a preset guard period.
6. A VoLTE service switching system, comprising:
the system comprises a VQI module, a voice quality detection module and a voice quality analysis module, wherein the VQI module is used for calculating the voice quality of a user in a target cell based on a preset voice quality detection algorithm, and the target cell comprises a current cell and a plurality of adjacent cells;
the switching module is used for selecting the adjacent cell with the highest voice quality for switching if the voice quality of the user in the current cell is lower than a first preset threshold value; if the voice quality of the user in the current cell is higher than a first preset threshold value and the wireless signal quality of the user in the current cell is lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching; when the wireless signal quality of the user in the current cell is lower than a second preset threshold value and the voice quality of the user in the current cell is lower than a first preset threshold value:
if the wireless signal quality of the user in the current cell is detected to be lower than a second preset threshold value, selecting the cell with the wireless signal quality higher than the second preset threshold value for switching, or
If the voice quality of the user in the current cell is detected to be lower than a first preset threshold value, the adjacent cell with the highest voice quality is selected for switching.
7. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 5.
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| CN110139316B (en) * | 2019-05-31 | 2022-07-08 | 中国联合网络通信集团有限公司 | Voice call switching method, device, equipment and computer readable storage medium |
| CN112055378B (en) * | 2019-06-05 | 2023-05-09 | 成都鼎桥通信技术有限公司 | Method and device for judging voice quality of narrow-band digital cluster |
| CN112908346B (en) * | 2019-11-19 | 2023-04-25 | 中国移动通信集团山东有限公司 | Packet loss recovery method and device, electronic equipment and computer readable storage medium |
| CN113055924B (en) * | 2019-12-26 | 2023-04-07 | 中国电信股份有限公司 | Voice quality evaluation method and device and computer readable storage medium |
| CN111816209A (en) * | 2020-06-19 | 2020-10-23 | 天通畅达(深圳)科技有限公司 | Voice switching method and device based on voice quality evaluation |
| CN111917468A (en) * | 2020-06-29 | 2020-11-10 | 西安理工大学 | Method for reducing switching times in VLC/Wi-Fi wireless heterogeneous network |
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