CN111314971A

CN111314971A - Network switching method and device

Info

Publication number: CN111314971A
Application number: CN201811519666.2A
Authority: CN
Inventors: 梁立涛; 马云飞; 侯普
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Beijing Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Beijing Co Ltd
Priority date: 2018-12-12
Filing date: 2018-12-12
Publication date: 2020-06-19
Anticipated expiration: 2038-12-12
Also published as: CN111314971B

Abstract

The invention relates to the technical field of wireless, in particular to a network switching method and a network switching device, which are used for acquiring call perception performance indexes of a 4G cell reported by a terminal and 2G adjacent cells corresponding to the 4G cell; respectively determining the cell grades of the 4G cell and each 2G adjacent cell; wherein the cell level characterizes a user call perceived quality of a terminal in a cell; adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target; based on the adjusted SRVCC switching threshold, SRVCC service switching is carried out, so that based on the call perception performance index, 4G cells and 2G adjacent cells are evaluated, the SRVCC switching threshold is adjusted, level-based switching is changed into perception-based switching, the problem that the perception of a user is poor after switching is avoided, and the whole call perception of the user is improved.

Description

Network switching method and device

Technical Field

The present invention relates to the field of wireless technologies, and in particular, to a network switching method and apparatus.

Background

At present, all services can be loaded on a 4G network based on the Voice over LTE (Voice over LTE) technology of the IMS, so that the data and the Voice services can be unified in the same network, and in an area where the Voice Call awareness based on the Voice over LTE is degraded, the Voice over LTE can be switched to 2G by Single Radio Voice Call Continuity (SRVCC) switching to maintain the Voice awareness.

In the prior art, switching between SRVCC systems is mainly determined based on a level, and when a switching determination is made, only whether a level of a 2G cell meets a switching threshold is considered, and the 2G cell is switched to when the level meets the switching threshold, but in the method in the prior art, whether a call perception of a user is good after the switching to the 2G cell is not considered, which may cause the user perception to be poor after the switching to the 2G cell.

Disclosure of Invention

Embodiments of the present invention provide a network handover method and apparatus, so as to solve a problem in the prior art that a user perception after handover is not considered in handover between SRVCC systems, which may cause the user perception after handover to be poor.

The embodiment of the invention provides the following specific technical scheme:

a network handover method, comprising:

acquiring call perception performance indexes of a 4G cell reported by a terminal and 2G adjacent cells corresponding to the 4G cell;

respectively determining the cell grades of the 4G cell and each 2G adjacent cell; wherein the cell level characterizes a user call perceived quality of a terminal in a cell;

adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target;

and switching the SRVCC service based on the adjusted SRVCC switching threshold.

Optionally, if the call sensing performance index at least includes the MOS value and the reception quality of the voice;

determining the cell grades of the 4G cell and each 2G neighbor cell respectively, specifically including:

counting the MOS value of the voice in the 4G cell within a preset time period, if the voice ratio of the MOS value larger than a preset sensing inflection point is determined to be smaller than a first preset threshold, determining that the cell grade of the 4G cell is smaller than a first grade, otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade;

and respectively counting the receiving quality of each 2G cell in a preset time period, if the voice ratio of the receiving quality greater than the preset level is determined to be less than a second preset threshold, determining that the cell level of the corresponding 2G cell is less than the first level, and otherwise, determining that the cell level of the corresponding 2G cell is not less than the first level.

Optionally, the call awareness performance indicator at least includes the number of voice events, a packet loss rate, a packet sending number, and a reception quality.

if the number of the voice events in the 4G cell in a preset time period is determined to be larger than a first preset number, or the uplink packet loss rate is not smaller than a first preset packet loss threshold value and the uplink packet sending number is not smaller than a second preset number, or the downlink packet loss rate is not smaller than a second preset packet loss threshold value and the downlink packet sending number is not smaller than a third preset number, determining that the cell grade of the 4G cell is smaller than a first grade, otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade;

if the ratio of the uplink or downlink receiving quality in the 2G cell in the time period is larger than the preset level is smaller than a third preset threshold, or the number of unsatisfied voice events is not smaller than a fourth preset threshold, determining that the cell level of the corresponding 2G cell is smaller than the first level, otherwise, determining that the cell level of the corresponding 2G cell is not smaller than the first level.

Optionally, adjusting the SRVCC handover threshold according to the cell levels of the 4G cell and each 2G neighboring cell, and a preset adjustment strategy and an optimization target, specifically including:

determining the total SEVCC switching times of the 4G cell and each 2G adjacent cell, and respectively determining the switching ratio of the SEVCC switching times of the 4G cell and each 2G adjacent cell to the total SEVCC switching times;

determining the quality difference proportion of the 2G adjacent cells of the 4G cells according to the determined cell grade of each 2G adjacent cell and the switching ratio;

dividing the 4G cell and each 2G adjacent cell into a preset sensing four-quadrant according to the determined cell grade of the 4G cell and the quality difference proportion of the 2G adjacent cells of the 4G cell; the preset sensing four quadrants comprise four quadrants which are respectively used for distinguishing the call sensing performance of the 4G cell and the call sensing performance of the 2G cell;

and adjusting the SRVCC switching threshold according to a preset adjusting strategy and an optimization target corresponding to each quadrant of the preset sensing four quadrants.

Optionally, the dividing the 4G cell and each 2G neighboring cell into preset sensing four quadrants according to the determined cell rank of the 4G cell and the quality difference ratio of the 2G neighboring cells of the 4G cell specifically includes:

if the cell grade of the 4G cell is not less than the first grade and the corresponding quality difference proportion is less than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a first quadrant;

if the cell grade of the 4G cell is smaller than the first grade and the corresponding quality difference proportion is smaller than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a second quadrant;

if the cell grade of the 4G cell is smaller than the first grade and the corresponding quality difference proportion is not smaller than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a third quadrant;

and if the cell grade of the 4G cell is not less than the first grade and the corresponding quality difference proportion is not less than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a fourth quadrant.

Optionally, adjusting the SRVCC handover threshold according to a preset adjustment strategy and an optimization target corresponding to each quadrant of a preset sensing four-quadrant, specifically including:

adjusting an SRVCC switching threshold aiming at a 4G cell and a 2G adjacent cell in a first quadrant to reduce SRVCC switching times until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, and returning to the SRVCC switching threshold before adjustment, or stopping adjustment optimization until the threshold is determined to be reached;

aiming at a 4G cell and a 2G adjacent cell in a second quadrant, adjusting a switching threshold in a 4G system, and adjusting an SRVCC switching threshold to increase SRVCC switching times until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, returning to the switching threshold in the 4G system and the SRVCC switching threshold before adjustment, or stopping adjustment optimization if the cell grade of the adjusted 4G cell is not less than a first grade, or stopping adjustment optimization until the threshold is determined to be reached;

aiming at a 4G cell and a 2G adjacent cell in a third quadrant, adjusting a switching threshold in a 4G system, and adjusting an SRVCC switching threshold to reduce SRVCC switching times, and returning to the switching threshold in the 4G system and the SRVCC switching threshold before adjustment until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, or stopping adjustment optimization if the cell grade of the adjusted 4G cell is not less than a first grade, or stopping adjustment optimization until the threshold is determined to be reached;

and adjusting the SRVCC switching threshold aiming at the 4G cell and the 2G adjacent cell in the fourth quadrant to reduce the SRVCC switching times, and returning to the SRVCC switching threshold before adjustment until the call perception performance index of the adjusted 4G cell is determined to be reduced, or stopping adjustment optimization until the call perception performance index is determined to reach the threshold.

Optionally, adjusting the SRVCC handover threshold to reduce the SRVCC handover times includes: counting the values of a B2 threshold and a B1 threshold in a first preset period, if the value of a B2 threshold is not less than a first value and the value of a B1 threshold is not more than a second value, reducing the B2 threshold and increasing the value of a B1 threshold according to a set step length so as to reduce the SRVCC switching times; wherein, the B1 threshold represents the 2G system cut-in threshold from 4G cut-in to the 2G system, and the B2 threshold represents the 4G system cut-out threshold from 4G cut-out to the 2G system.

Optionally, adjusting the handover threshold in the 4G system, and adjusting the SRVCC handover threshold to increase the SRVCC handover frequency includes:

screening 4G adjacent cells of which the cell grade is not less than the first grade of the 4G cell, adjusting the individual deviation CIO of the 4G cell to the cells of the adjacent cells, and starting a pilot frequency switching function based on voice quality;

counting the values of the B2 threshold and the B1 threshold in a second preset period, if the value of the B2 threshold is not larger than the third value and the value of the B1 threshold is not smaller than the fourth value, increasing the B2 threshold and reducing the value of the B1 threshold according to a set step length so as to increase the SRVCC switching times.

A network switching apparatus comprising:

the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring call perception performance indexes of a 4G cell reported by a terminal and each 2G adjacent cell corresponding to the 4G cell;

a determining module, configured to determine cell levels of a 4G cell and each 2G neighbor cell respectively; wherein the cell level characterizes a user call perceived quality of a terminal in a cell;

the adjusting module is used for adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target;

and the switching module is used for switching the SRVCC service based on the adjusted SRVCC switching threshold.

An electronic device, comprising:

at least one memory for storing a computer program;

at least one processor configured to implement the steps of any of the above-described network handover methods when executing a computer program stored in a memory.

A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of any of the above-mentioned network handover methods.

In the embodiment of the invention, the call perception performance indexes of a 4G cell reported by a terminal and each 2G adjacent cell corresponding to the 4G cell are obtained; respectively determining the cell grades of the 4G cell and each 2G adjacent cell; wherein the cell level characterizes a user call perceived quality of a terminal in a cell; adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target; based on the adjusted SRVCC switching threshold, SRVCC service switching is carried out, so that based on the call perception performance index, 4G cells and 2G adjacent cells are evaluated, the cell grade is determined, the SRVCC switching threshold is adjusted according to the cell grade of each cell, level-based switching is changed into perception-based switching, the problem that the perception of users is poor after switching is solved by considering the perception of the users after switching, and the whole call perception of the users is improved.

Drawings

Fig. 1 is a flowchart of a network handover method according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating an influence of a ratio of a 4G MOS to an uplink MOS on call sensing in an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating the influence of 2G MOS on call sensing compared with the receiving quality in the embodiment of the present invention;

FIG. 4 is a diagram illustrating sensing four quadrants according to an embodiment of the present invention;

FIG. 5 is a flow chart of another network handover method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a network switching apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an electronic device in an embodiment of the 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.

At present, in order to implement smooth handover between Voice over LTE (Voice over LTE) based on IMS and a Voice Call of a 2G/3G network, that is, handover between 4G and 2G/3G, a Single Radio Voice Call Continuity (SRVCC) scheme is proposed, so that in the whole process of handover of a user terminal from an LTE network to a 2G/3G network, the Call is kept continuous, the problem of Voice Call Continuity when the user terminal moves between the LTE network and the 2G/3G network is well solved, and in an area based on poor Call perception of Voice over LTE, the Voice over LTE is handed over to the 2G/3G network by SRVCC handover to keep Call perception.

However, in the prior art, only whether the level of the 2G cell meets the handover threshold is considered in handover decision, the 2G cell is handed over when the handover threshold is met, and the problem that the call perception of the user after the handover to the 2G cell is poor is often caused because the call perception of the user after the handover becomes good is not considered.

Therefore, in the embodiment of the invention, the user perception of the 4G cell and the 2G cell is mainly considered, and the switching threshold is optimized, so that the user perception of the 4G cell and the 2G cell before and after switching is comprehensively considered, and the problem that the user perception is poor after the switching to the 2G cell is avoided.

Of course, the embodiment of the present invention is not limited to the handover between the 4G cell and the 2G cell, but may also be applied to the handover between the 4G cell and the 3G cell, and may be applied to similar scenarios and problems, and in the embodiment of the present invention, only the handover between the 4G cell and the 2G cell is schematically illustrated as an example.

Referring to fig. 1, in the embodiment of the present invention, a specific process of the network switching method is as follows:

step 100: and acquiring call perception performance indexes of the 4G cell reported by the terminal and each 2G adjacent cell corresponding to the 4G cell.

The call awareness performance index at least includes a Mean Opinion Score (MOS) value and a reception quality of the voice, and may also include the number of voice events, a packet loss rate, a packet sending number, and the like, and is mainly used for evaluating the call awareness quality of the user, which is not limited in the embodiment of the present invention.

Step 110: respectively determining the cell grades of the 4G cell and each 2G adjacent cell; wherein the cell level characterizes a user perceived quality of speech of the terminal in the cell.

When step 110 is executed, the following two ways can be used:

the first mode is as follows: and judging based on the perception inflection point.

In practice, based on a standard and combined with a test, a sensing inflection point of 2G and 4G can be obtained, when the sensing inflection point is lower than the sensing inflection point, the user sensing is deteriorated, for example, when VoLTE MoS <2.9 and 2G MoS <2.1 in the current standard, the user sensing is obviously deteriorated, and sensing problems such as single pass, inaudibility and the like occur, and the conclusion is verified by testing the actual call of the current network, so that VoLTE MoS <3 and 2G MoS <2 can be used as the sensing inflection point threshold.

However, in practice, MOS sensing needs to be obtained by methods such as drive test, which cannot be directly extracted from the existing network, and cannot evaluate all cells of the entire network, and it is difficult to implement the method.

For example, the call awareness performance index at least includes a MOS value of voice and a reception quality, among others.

Then specifically: 1) and counting the MOS value of the voice in the 4G cell in a preset time period, if the voice ratio of the MOS value larger than a preset sensing inflection point is determined to be smaller than a first preset threshold, determining that the cell grade of the 4G cell is smaller than a first grade, and otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade.

The preset sensing inflection point is, for example, MOS3.0, and the first preset threshold is, for example, 97%, which is not limited in the embodiment of the present invention and may be set according to actual situations and requirements.

In the embodiment of the present invention, the first level may represent a level for distinguishing how well the user is perceived to be, where cells smaller than the first level may be considered as poor-perceived cells, and cells not smaller than the first level may be considered as good-perceived cells.

For example, referring to fig. 2, a schematic diagram of the impact of the ratio of the 4G MOS and the uplink MOS on the call sensing in the embodiment of the present invention is shown. In the embodiment of the invention, the relation between the user perception MOS and the VoLTE network index statistics is searched through big data statistics, and through data analysis of a large number of cells, as can be seen from fig. 2, the ratio of the VoLTE MOS to the SEQ MOS is positively correlated with the ratio of more than 3.0, and the VoLTE user perception is deteriorated when the ratio of more than 3.0 MOS is lower than 97%, so that the VoLTE user perception is used as a judgment threshold of a poor call perception cell of the VoLTE cell according to the mapping relation, that is, when the ratio of the MOS value greater than 3.0 to the voice is smaller than 97%, the 4G cell is determined to be a poor cell, otherwise, the 4G cell is determined to be a good cell.

2) And respectively counting the receiving quality of each 2G cell in a preset time period, if the voice ratio of the receiving quality greater than the preset level is determined to be less than a second preset threshold, determining that the cell level of the corresponding 2G cell is less than the first level, and otherwise, determining that the cell level of the corresponding 2G cell is not less than the first level.

The preset level represents a level of the reception quality, for example, a level of 0 to 4, and the second preset threshold is, for example, 90%, and also in the embodiment of the present invention, the preset level is not limited, and may be set according to actual situations and requirements.

Specifically, referring to fig. 3, a schematic diagram of the influence of 2G MOS and reception quality occupation ratio on call sensing in the embodiment of the present invention is shown. In the embodiment of the present invention, the relationship between the user sensing MOS and the 2G network index statistics is determined through big data statistics, and through correlation analysis of call data of a large number of cells, as can be seen from fig. 3, the 2G MOS is positively correlated with the reception quality 0-4, and when the reception quality ratio is lower than 90%, the 2G user sensing is degraded, so that the 2G MOS can be used as a judgment threshold of the call sensing poor cell of the 2G cell according to the mapping relationship, that is, if it is determined that the speech ratio of the reception quality 0-4 level is lower than 90%, the 2G cell is determined to be the poor cell, otherwise, the 2G cell is determined to be the good cell.

The second mode is as follows: and judging based on the network index.

The call perception performance index at least comprises the number of voice events, the packet loss rate, the number of transmitted packets and the receiving quality.

Then specifically: 1) if the number of the voice events in the 4G cell in the preset time period is determined to be larger than a first preset number, or the uplink packet loss rate is not smaller than a first preset packet loss threshold value and the uplink packet sending number is not smaller than a second preset number, or the downlink packet loss rate is not smaller than a second preset packet loss threshold value and the downlink packet sending number is not smaller than a third preset number, determining that the cell grade of the 4G cell is smaller than a first grade, otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade.

The first preset number, the second preset number, the third preset number, and the preset packet loss threshold value are specifically values, which are not limited in the embodiment of the present invention and may be set according to actual situations.

That is to say, three possible ways of determining the cell level of the 4G cell are provided in the embodiment of the present invention, and the cell level of the 4G cell may be determined according to the number of voice events in the 4G cell, the uplink packet loss rate and the uplink packet sending number, the downlink packet loss rate and the downlink packet sending number, or according to any combination of two or three of them.

For example, if the first preset number is 20, the second preset number is 5000, the third preset number is 5000, the first preset packet loss threshold and the second preset packet loss threshold are both 0.2%, and the preset time period is 1 day, it may be determined that the cell level of the 4G cell is less than the first level, that is, the difference cell, when any of the following conditions is met:

(1) the number of day-granularity VoLTE voice events >20, which can be understood as the number of voice events determined to be unsatisfactory in a 4G cell.

(2) The uplink packet loss rate of the day granularity VoLTE is 0.2%, and the uplink packet transmission number of the VoLTE is 5000.

(3) The packet loss rate of the day granularity VoLTE downlink is 0.2%, and the number of VoLTE downlink packets is 5000.

2) If the ratio of the uplink or downlink receiving quality in the 2G cell in the time period is larger than the preset level is smaller than a third preset threshold, or the number of unsatisfied voice events is not smaller than a fourth preset threshold, determining that the cell level of the corresponding 2G cell is smaller than the first level, otherwise, determining that the cell level of the corresponding 2G cell is not smaller than the first level.

The specific values of the third preset threshold and the fourth preset threshold are not limited in the embodiment of the present invention, and may be set according to actual situations.

That is to say, two possible ways of determining the cell rank of the 2G cell are provided in the embodiment of the present invention, the number of unsatisfactory voice events may be determined according to the ratio of the uplink received quality to the downlink received quality in the 2G cell, which is greater than the preset rank, or of course, the cell rank of the 2G cell may also be determined according to a combination of the two.

For example, if the third preset threshold is 85% and the fourth preset threshold is 14%, it may be determined that the cell rank of the 2G cell is smaller than the first rank when any of the following conditions is met, that is, the cell rank is a bad cell:

1) the receiving quality of the uplink 0-4 level of the day granularity accounts for less than 85 percent, or the receiving quality of the downlink 0-4 level of the day granularity accounts for less than 85 percent.

2) The number of speech events that are unsatisfied with the day granularity > -14.

Therefore, the user call perception quality of the 2G cell and the 4G cell can be judged through various voice call perception indexes in the 2G cell and the 4G cell, the cell grade is determined, namely the cell with good perception or the cell with poor perception is determined, and the switching threshold can be optimized according to the user perception in the follow-up process.

Step 120: and adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target.

Because one 4G cell generally corresponds to a plurality of 2G neighbor cells, the embodiment of the present invention provides an evaluation method for comprehensively evaluating perceived four quadrants of 4G and 2G neighbor cells, which divides the 4G cell and each 2G neighbor cell into different quadrants, and continuously optimizes a handover threshold according to a corresponding adjustment strategy and an optimization target.

Specifically, when step 120 is executed, the method specifically includes:

1) and determining the total SEVCC switching times of the 4G cell and each 2G adjacent cell, and respectively determining the switching ratio of the SEVCC switching times of the 4G cell and each 2G adjacent cell to the total SEVCC switching times.

For example, the number of SRVCC handover times at the neighbor pair level of the 4G cell is determined and is denoted as N _ i (i is 1,2, …, N), and the handover duty ratio of each neighbor pair, that is, the handover duty ratio of the number of SEVCC handover times of the 4G cell to each 2G neighbor cell is denoted as alpha _ i (i is 1,2, …, N), and then alpha _ i is N _ i/sum (N _ i).

2) And determining the quality difference proportion of the 2G adjacent cells of the 4G cells according to the determined cell grade of each 2G adjacent cell and the switching ratio.

For example, each 2G neighbor cell is assigned a weight value, which is denoted as K _ i, according to the cell level of each 2G neighbor cell, if the cell level of the 2G neighbor cell is less than the first level, that is, the cell with poor sensing, the weight value K _ i is 1, and if the cell level of the 2G neighbor cell is not less than the first level, that is, the cell with good sensing, the weight value K _ i is 0.

The quality difference ratio of the 2G neighbor cell of the 4G cell is calculated as sum (alpha _ i × K _ i) (i is 1,2, …, n).

3) Dividing the 4G cell and each 2G adjacent cell into a preset sensing four-quadrant according to the determined cell grade of the 4G cell and the quality difference proportion of the 2G adjacent cells of the 4G cell; the preset sensing four quadrants comprise four quadrants which are respectively used for distinguishing the call sensing performance of the 4G cell and the 2G cell.

Specifically, the following four cases are classified:

in the first case: and if the cell grade of the 4G cell is not less than the first grade and the corresponding quality difference proportion is less than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a first quadrant.

The preset ratio is, for example, 20%, and the embodiment of the present invention is not limited, and may be set according to an actual situation.

That is, the cell rank of the 4G cell is not less than the first rank and is a good cell, and the quality difference ratio of the corresponding 2G neighboring cell is less than the preset ratio, the 4G cell is classified into the first quadrant, that is, the 4G cell is considered as a good cell and the 2G neighboring cell is also a good cell.

In the second case: and if the cell grade of the 4G cell is less than the first grade and the corresponding quality difference proportion is less than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a second quadrant.

Namely, the cell grade of the 4G cell is smaller than the first grade, and is a bad cell, and the quality difference ratio of the corresponding 2G neighbor cell is smaller than the preset ratio, the 4G cell is classified into the second quadrant, that is, the 4G cell is considered as a bad cell and the 2G neighbor cell is considered as a good cell.

In the third case: and if the cell grade of the 4G cell is less than the first grade and the corresponding quality difference proportion is not less than the preset proportion, dividing the 4G cell and each 2G adjacent cell into a third quadrant.

Namely, the 4G cell is a bad cell, and the quality difference ratio of the corresponding 2G neighbor cell is not less than the preset ratio, the cells are divided into the third quadrant, namely, the 4G cell is considered as a bad cell and the 2G neighbor cell is also a bad cell.

In a fourth case: and if the cell grade of the 4G cell is not less than the first grade and the corresponding quality difference ratio is not less than the preset ratio, dividing the 4G cell and each 2G adjacent cell into a fourth quadrant.

Namely, the 4G cell is a good cell, and the quality difference ratio of the corresponding 2G neighbor cell is not less than the preset ratio, the cell is divided into the fourth quadrant, namely, the 4G cell is considered as a good cell and the 2G neighbor cell is considered as a bad cell.

For example, referring to fig. 4, which is a schematic diagram of sensing a four-quadrant in an embodiment of the present invention, as shown in fig. 4, a 4G cell and a 2G neighbor cell are divided into different quadrants according to a cell rank and a quality ratio of the 4G and 2G neighbor cells, a horizontal axis represents a cell rank of the 4G cell, that is, represents how good the 4G cell senses, the rightward direction represents the better the 4G cell senses, the leftward direction represents the 4G cell senses, a vertical axis represents a cell rank of the 2G cell, that is, represents the 2G cell senses, the bottom-up represents the better the 2G cell senses, and vice versa represents the 2G cell senses.

Then it can also be seen from fig. 4 that the first quadrant represents a 4G good cell and a 2G good cell, the second quadrant represents a 4G bad cell and a 2G good cell, the third quadrant represents a 4G bad cell and a 2G bad cell, and the fourth quadrant represents a 4G good cell and a 2G bad cell.

4) And adjusting the SRVCC switching threshold according to a preset adjusting strategy and an optimization target corresponding to each quadrant of the preset sensing four quadrants.

In the embodiment of the invention, the optimization principle is that the switching to the 2G cell is not performed as much as possible, if the 4G cell is a good cell, the SRVCC switching frequency is reduced, so that a user can have better user perception based on the 4G cell environment; if the 4G cell is a bad cell, there are two situations, if the 2G neighboring cell is a good cell at this time, the SRVCC handover frequency is increased, and the handover is performed to the 2G neighboring cell, so as to ensure that the user perception after the handover is better, and if the 2G neighboring cell is also a bad cell at this time, the user perception will be worse after the handover to the 2G neighboring cell, so that the SRVCC handover frequency is still reduced at this time.

Specifically, for different quadrants, the following four cases are correspondingly divided:

in the first case: and adjusting the SRVCC switching threshold aiming at the 4G cell and the 2G adjacent cell in the first quadrant to reduce the SRVCC switching times, and returning to the SRVCC switching threshold before adjustment until the call perception performance index of the adjusted 4G cell is determined to be reduced, or stopping adjustment and optimization until the call perception performance index is determined to be reduced.

The method specifically comprises the following two aspects:

in a first aspect: adjusting the SRVCC handover threshold value to reduce the SRVCC handover times, specifically comprising:

counting the values of a B2 threshold and a B1 threshold in a first preset period, if the value of a B2 threshold is not less than a first value and the value of a B1 threshold is not more than a second value, reducing the B2 threshold and increasing the value of a B1 threshold according to a set step length so as to reduce the SRVCC switching times; wherein, the B1 threshold represents the 2G system cut-in threshold from 4G cut-in to the 2G system, and the B2 threshold represents the 4G system cut-out threshold from 4G cut-out to the 2G system.

The first preset period, the first value, the second value and the set step length may be set according to actual conditions, and the embodiment of the present invention is not limited.

That is, reducing the SRVCC handover times requires reducing the 4G system handover threshold and increasing the 2G system handover threshold, so that the 4G cell is handed over to the 2G neighbor cell only when the 4G is worse than the B2 threshold and the 2G is better than the B1 threshold, thereby reducing the SRVCC handover times.

For example, adjust B2 threshold: if the B2 threshold is not less than the first value, for example, higher than-115 dBm, for example, the step length is set to 3dBm, the B2 threshold is adjusted down by 3dBm, and the minimum is adjusted to-118 dBm, that is, the threshold of B2 is-118 dBm.

As another example, adjust the B1 threshold: if the B1 threshold is not greater than a second value, e.g., less than-90 dBm, the B1 threshold is adjusted up to 3dBm, and the highest B1 threshold is adjusted to-87 dBm, i.e., the threshold of B1 is-87 dBm.

Further, the duration of the first preset period may be increased to reduce the SRVCC handover times. For example, the first preset period is 2560ms, that is, the values of the B2 threshold and the B1 threshold need to be kept stable in the first preset period, and then the values are determined to be equal to the first value or the second value. And if the duration of the current first preset period is less than 2560ms, adjusting the first preset period to a high gear by the adjustment step length, and adjusting the maximum time to 2560 ms.

Further, the SRVCC handover threshold is optimized, and the SRVCC handover times are reduced, which may also be implemented in other ways in the embodiments of the present invention, and specifically, several other possible implementation manners are provided: (1) optimizing a packet loss rate threshold for quality-based SRVCC handover: sequentially increasing the packet loss rate threshold by 5% and setting the maximum packet loss rate threshold to 60%; (2) optimizing a statistical period of quality-based SRVCC handover: the statistical period is sequentially incremented by 1s upwards, and is set to 5s at maximum.

In a second aspect: and judging an optimization target, specifically comprising: and returning to the SRVCC switching threshold before adjustment until the adjusted 4G cell call perception performance index is determined to be reduced, or stopping adjustment and optimization until the threshold is determined to be reached.

That is to say, in the embodiment of the present invention, after each parameter adjustment, the call awareness performance index of the 4G cell needs to be obtained and observed again.

For example, if the 4G cell is originally a non-poor cell, if the call sensing performance index of the adjusted 4G cell is reduced and the index is deteriorated, which indicates that the previous adjustment may be not reasonable, the operation is backed off, or the adjustment optimization is stopped when the threshold of the maximum adjustment is reached.

For another example, if the 4G cell is originally a bad cell, if the call sensing performance index of the adjusted 4G cell is deteriorated, the operation is backed off; or if the call perception performance index of the adjusted 4G cell becomes good but is still a poor cell, continuing to perform adjustment optimization; or if the adjusted 4G cell becomes a non-poor cell, stopping optimization; or, if the maximum adjusted threshold has been reached, stopping the optimization of the adjustment of the parameters.

That is, for the first quadrant, the 4G cell is a good cell, at this time, the SRVCC handover number is reduced, and the SRVCC handover threshold is adjusted based on the optimization target.

In the second case: and adjusting the switching threshold in the 4G system and adjusting the SRVCC switching threshold aiming at the 4G cell and the 2G adjacent cell in the second quadrant to increase the SRVCC switching times until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, returning to the switching threshold in the 4G system and the SRVCC switching threshold before adjustment, or stopping adjusting optimization until the cell grade of the adjusted 4G cell is not less than the first grade, or stopping adjusting optimization until the threshold is determined to be reached.

The method specifically comprises the following two aspects:

in a first aspect: and adjusting the switching threshold in the 4G system and adjusting the SRVCC switching threshold to increase the SRVCC switching times.

The method specifically comprises the following steps: (1) adjusting the switching threshold in the 4G system: screening out 4G adjacent cells of which the cell grade of the 4G cell is not less than the first grade, adjusting Cell Individual Offset (CIO) of the 4G cell to the adjacent cells, and starting an inter-frequency switching function based on voice quality.

For example, screening 4G good neighbor cells: the judgment rule of the 4G good cell is satisfied and the success rate of the switching between the serving cell and the adjacent cell is more than 99.8 percent.

As another example, the CIO of the point-to-point cell is adjusted: and if the CIO is set to be 0, the CIO of the serving cell to the adjacent cell offset is increased by 3db to 3db at most.

As another example, inter-frequency handover based on voice quality is turned on: this function is turned on for cells that do not have voice quality based inter-frequency handover turned on.

(2) Adjusting SRVCC switching threshold to increase SRVCC switching times: counting the values of the B2 threshold and the B1 threshold in a second preset period, if the value of the B2 threshold is not larger than the third value and the value of the B1 threshold is not smaller than the fourth value, increasing the B2 threshold and reducing the value of the B1 threshold according to a set step length so as to increase the SRVCC switching times.

The values of the second preset period, the third value, the fourth value and the set step length can be set according to actual conditions, and the embodiment of the invention is not limited.

For example, adjust B2 threshold: if the B2 threshold is not greater than the third value, for example, lower than-113 dBm, for example, the step length is set to 3dBm, the B2 threshold is adjusted to 3dBm, and is adjusted to-110 dBm at maximum, that is, the B2 threshold of the adjustment is-110 dBm.

As another example, adjust the B1 threshold: if the B1 threshold is not less than the fourth value, for example, higher than-92 dBm, the B1 threshold is adjusted down by 3dBm, and the lowest B1 threshold is adjusted to-95 dBm, that is, the down-adjusted threshold of B1 is-95 dBm.

Further, the duration of the first preset period may be reduced to increase the SRVCC handover times. For example, if the duration of the current first preset period is greater than 640ms, the first preset period is adjusted to a lower gear by the adjustment step length, and the minimum time is adjusted to 640 ms.

Further, the SRVCC handover threshold is optimized, and the SRVCC handover times are increased, which may also be implemented in other ways in the embodiments of the present invention, and specifically, several other possible implementation manners are provided: (1) starting quality based SRVCC handover: the method comprises the steps that a cell switched by SRVCC based on quality is not started, the function is started, a packet loss statistical period is set to be 1s by default, and a packet loss rate threshold is set to be 20%; (2) optimizing a quality-based SRVCC handover threshold: and sequentially reducing the packet loss rate threshold by 5%. The specific numerical values herein are merely examples and are not limiting.

That is to say, for the second quadrant, the 4G cell is the bad cell and its 2G neighbor cell is the good cell, immediately switches to the 2G cell, and also can guarantee that the user perception is better, so at this moment, the SRVCC handover number of times is increased, switches to the better 2G cell of the call perception, and promotes the call perception of the user.

In a second aspect: and judging an optimization target, specifically comprising: and returning to the switching threshold and the SRVCC switching threshold in the 4G system before the adjustment until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, or stopping the adjustment optimization if the cell grade of the adjusted 4G cell is not less than the first grade, or stopping the adjustment optimization until the threshold is determined to be reached.

In the third case: and adjusting the switching threshold in the 4G system and the SRVCC switching threshold aiming at the 4G cell and the 2G adjacent cell in the third quadrant to reduce the SRVCC switching times, and returning to the switching threshold in the 4G system and the SRVCC switching threshold before adjustment until the conversation perception performance index of the adjusted 4G cell is determined to be reduced, or stopping adjustment optimization if the cell grade of the adjusted 4G cell is not less than the first grade, or stopping adjustment optimization until the threshold is determined to be reached.

The method specifically comprises the following two aspects:

in a first aspect: and adjusting the switching threshold in the 4G system and adjusting the SRVCC switching threshold to reduce the SRVCC switching times.

And adjusting the switching threshold in the 4G system in the same manner as that in the second quadrant, namely screening out 4G adjacent cells of which the cell grade of the 4G cell is not less than the first grade, adjusting the individual deviation CIO of the 4G cell to the cells of the adjacent cells, and starting the pilot frequency switching function based on the voice quality.

Adjusting the SRVCC handover threshold to reduce the SRVCC handover frequency in the same manner as in the first quadrant, that is, counting the values of the B2 threshold and the B1 threshold in the first preset period, and if the value of the B2 threshold is not less than the first value and the value of the B1 threshold is not greater than the second value, reducing the B2 threshold and increasing the value of the B1 threshold according to the set step length to reduce the SRVCC handover frequency, which is not described in detail again.

In a fourth case: and adjusting the SRVCC switching threshold aiming at the 4G cell and the 2G adjacent cell in the fourth quadrant to reduce the SRVCC switching times, and returning to the SRVCC switching threshold before adjustment until the call perception performance index of the adjusted 4G cell is determined to be reduced, or stopping adjustment optimization until the call perception performance index is determined to reach the threshold.

The method specifically comprises the following two aspects:

in a first aspect: adjusting the SRVCC handover threshold to reduce the SRVCC handover frequency, specifically in the same manner as in the first quadrant, that is, counting values of a B2 threshold and a B1 threshold in the first preset period, and if the value of the B2 threshold is not less than the first value and the value of the B1 threshold is not greater than the second value, reducing the B2 threshold and increasing the value of the B1 threshold according to the set step length to reduce the SRVCC handover frequency, which is not described in detail again.

Therefore, in the embodiment of the invention, the 4G cell and each 2G adjacent cell are divided into corresponding quadrants, and then the SRVCC switching threshold can be continuously adjusted according to the adjustment strategy and the optimization target corresponding to different quadrants, so that the user perception before and after switching is better, and the whole call perception of the user is improved.

Step 130: and switching the SRVCC service based on the adjusted SRVCC switching threshold.

In the embodiment of the invention, the call perception performance indexes of a 4G cell and each 2G adjacent cell corresponding to the 4G cell reported by a terminal are obtained; respectively determining the cell grades of the 4G cell and each 2G adjacent cell; adjusting the SRVCC switching threshold according to the cell grades of the 4G cell and each 2G adjacent cell, and a preset adjusting strategy and an optimizing target; based on the adjusted SRVCC switching threshold, SRVCC service switching is carried out, thus, based on the call perception performance index, 4G cells and 2G adjacent cells are evaluated, the cell grade is determined, the SRVCC switching threshold is adjusted according to the cell grade of each cell, the level-based switching is changed into perception-based switching, the SRVCC service switching can be executed according to the adjusted SRVCC switching threshold, the user perception after switching is considered, the problem that the user perception after switching is poor is avoided, and the whole call perception of a user is improved.

Specifically, referring to fig. 5, a flowchart of another network switching method according to an embodiment of the present invention is described in detail below with specific application scenarios, which specifically includes:

step 500: and judging based on the perception inflection point.

Step 501: and taking VoLTE MoS <3 and 2G MoS <2 as a sensing inflection point threshold.

Step 502: and determining a corresponding cell grade rule of the 4G cell based on the 4G network index.

I.e. the call perception indicator is the MOS value of speech.

Specifically, the method comprises the following steps: and counting the MOS value of the voice in the 4G cell in a preset time period, if the voice ratio of the MOS value larger than a preset sensing inflection point is determined to be smaller than a first preset threshold, determining that the cell grade of the 4G cell is smaller than a first grade, and otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade.

Step 503: a rule to determine a cell rank of a corresponding 2G cell based on the 2G network indicator.

I.e. the call awareness performance indicator is the reception quality.

Specifically, the method comprises the following steps: and respectively counting the receiving quality of each 2G cell in a preset time period, if the voice ratio of the receiving quality greater than the preset level is determined to be less than a second preset threshold, determining that the cell level of the corresponding 2G cell is less than the first level, and otherwise, determining that the cell level of the corresponding 2G cell is not less than the first level.

Step 504: and judging based on the network index.

Step 505: and determining a cell level rule of the 4G cell based on the call perception performance index.

Namely, the call perception performance index at least comprises the number of voice events, the packet loss rate, the number of transmitted packets and the receiving quality.

Specifically, the method comprises the following steps: 1) if the number of the voice events in the 4G cell in the preset time period is determined to be larger than a first preset number, or the uplink packet loss rate is not smaller than a first preset packet loss threshold value and the uplink packet sending number is not smaller than a second preset number, or the downlink packet loss rate is not smaller than a second preset packet loss threshold value and the downlink packet sending number is not smaller than a third preset number, determining that the cell grade of the 4G cell is smaller than a first grade, otherwise, determining that the cell grade of the 4G cell is not smaller than the first grade.

Step 506: a cell ranking rule for the 2G cell based on the call awareness performance indicator is determined.

The method specifically comprises the following steps: if the ratio of the uplink or downlink receiving quality in the 2G cell in the time period is larger than the preset level is smaller than a third preset threshold, or the number of unsatisfied voice events is not smaller than a fourth preset threshold, determining that the cell level of the corresponding 2G cell is smaller than the first level, otherwise, determining that the cell level of the corresponding 2G cell is not smaller than the first level.

Step 507: and dividing the 4G cell and each 2G adjacent cell into a preset perception four quadrant.

Specifically, the division is performed according to the determined cell grade of the 4G cell and the quality difference proportion of the 2G neighbor cells of the 4G cell.

Step 508: and adjusting the SRVCC switching threshold according to the preset adjustment strategy corresponding to each quadrant.

Step 509: and judging whether the optimization target is reached, if so, executing step 510, otherwise, executing step 507.

If the optimization goal is determined to be reached, the adjustment optimization is finished, and if the optimization goal is not reached, the call perception indexes of the 4G and all 2G adjacent cells are continuously observed, the cell grade is determined, and therefore the SRVCC switching threshold is continuously adjusted.

Step 510: and (6) ending.

It should be noted that, in the embodiment of the present invention, the execution sequence of the above steps 500 to 503, and the step 504 to 506 is not limited, and may be alternatively executed for two different manners of determining the 4G and 2G cells, which is only one possible example.

Based on the foregoing embodiments, referring to fig. 6, in an embodiment of the present invention, a network switching apparatus specifically includes:

an obtaining module 60, configured to obtain a call sensing performance index of a 4G cell reported by a terminal and each 2G neighboring cell corresponding to the 4G cell;

a determining module 61, configured to determine cell ranks of the 4G cell and each 2G neighboring cell respectively; wherein the cell level characterizes a user call perceived quality of a terminal in a cell;

an adjusting module 62, configured to adjust an SRVCC handover threshold according to the cell classes of the 4G cell and each 2G neighboring cell, and a preset adjusting policy and an optimization target;

and a switching module 63, configured to perform SRVCC service switching based on the adjusted SRVCC switching threshold.

Referring to fig. 7, in an embodiment of the invention, a structural schematic diagram of an electronic device is shown.

Embodiments of the present invention provide an electronic device, which may include a processor 710 (CPU), a memory 720, an input device 730, an output device 740, and the like, wherein the input device 730 may include a keyboard, a mouse, a touch screen, and the like, and the output device 740 may include a display device, such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), and the like.

Memory 720 may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides processor 710 with program instructions and data stored in memory 720. In the embodiment of the present invention, the memory 720 may be used to store the program of the network switching method described above.

The processor 710 is configured to execute any of the above-mentioned methods for network handover according to the obtained program instructions by calling the program instructions stored in the memory 720.

Based on the above embodiments, in the embodiments of the present invention, there is provided a computer-readable storage medium on which a computer program is stored, where the computer program, when executed by a processor, implements the network switching method in any of the above method embodiments.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments 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 encompass such modifications and variations.

Claims

1. A method for network handover, comprising:

adjusting the SRVCC switching threshold of the single wireless voice call according to the cell grades of the 4G cell and each 2G adjacent cell, a preset adjusting strategy and an optimizing target;

2. The method of claim 1 wherein if the call awareness performance indicator comprises at least the Mean Opinion Score (MOS) value and the reception quality of the speech;

3. The method of claim 1, wherein if the call awareness performance indicator comprises at least the number of voice events, packet loss rate, number of packets sent, and reception quality;

4. The method according to any one of claims 1,2, or 3, wherein adjusting the SRVCC handover threshold according to the cell classes of the 4G cell and each 2G neighbor cell, and a preset adjustment policy and optimization objective specifically comprises:

5. The method of claim 4, wherein the step of grouping 4G cells and 2G neighbor cells into a predetermined sensing four-quadrant according to the determined cell rank of the 4G cell and the quality difference ratio of the 2G neighbor cells of the 4G cell comprises:

6. The method of claim 5, wherein adjusting the SRVCC handover threshold according to a preset adjustment policy and an optimization objective corresponding to each quadrant of a preset sensing quadrant comprises:

7. The method of claim 6, wherein adjusting the SRVCC handover threshold value to reduce SRVCC handover times comprises:

8. The method of claim 6, wherein adjusting the handover threshold in the 4G system and adjusting the SRVCC handover threshold to increase the SRVCC handover times specifically comprises:

9. A network switching apparatus, comprising:

an adjusting module, configured to adjust a single radio voice call continuity SRVCC handover threshold according to the cell classes of the 4G cell and each 2G neighboring cell, and a preset adjustment policy and an optimization target;

10. An electronic device, comprising:

at least one memory for storing a computer program;

at least one processor adapted to implement the steps of the method according to any of claims 1-8 when executing a computer program stored in a memory.

11. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program realizing the steps of the method according to any one of claims 1-8 when executed by a processor.