CN109996254A - Voice service single-pass reason localization method, device, equipment and medium - Google Patents

Abstract

The embodiment of the invention provides a kind of voice service single-pass reason localization method, device, equipment and media.This method comprises: 1) acquire the specific field in LTE network measurement report sample data, the field includes at least any single or multiple fields in voice uplink packet loss field and voice downstream packet loss field and following field: downlink reference signal receives power field, uplink covering field, upstream sinr field, base station reception jamming power field and adjacent area Reference Signal Received Power field；2) when voice uplink packet loss field or voice downstream packet loss field meet the first threshold of setting, then it is judged as that there are one-way voices；3) the reason of positioning single-pass.Data source used by the embodiment of the present invention is easy to get, and easy to accomplish, and can segment single-pass reason.

Description

Method, device, device and medium for locating cause of single-pass voice service

technical field

The present invention relates to the technical field of wireless network optimization, and in particular, to a method, device, equipment and medium for locating the cause of a single-pass voice service.

Background technique

In the 4G communication network, with the solution of a large number of end-to-end cooperation problems of terminals, base stations, core networks, and IMS (IP Multimedia Subsystem) network elements, the current VoLTE (Voice LET) services are in terms of accessibility and retention. It is no longer the main problem, and poor voice perception problems such as poor quality and single-pass during the call will become the focus of VoLTE optimization.

In view of the single-pass problem of voice services, the existing technology proposes to use the massive user plane data RTP/RTCP of each interface to evaluate the single-pass with "the RTP packet loss rate exceeds 80% within a 5-second monitoring period", and delimit the end-to-end chain. The method in the five fields of "IMS", "core network", "CS (circuit switched domain)", "terminal" and "air interface" in the road.

The above single-pass evaluation and delimitation methods have the following problems: the data source collection and deployment are complex and costly, and when the S1-U port RTP data is not collected, it is impossible to evaluate the single-pass and other perception problems according to RTP packet loss and delay. , the optimization of VoLTE voice quality improvement cannot be carried out in time. According to voice quality demarcation experience, wireless issues are the most common factor affecting user perception. However, after the existing method is defined as an air interface problem, it is impossible to continue to locate and subdivide the TOP users, weak uplink/downlink coverage, interference, handover, capacity and other reasons. The traditional method on the wireless side only has downlink coverage and interference statistics at the cell level, which will conceal the real reasons for the poor quality of VoLTE users.

To sum up, the means for judging single-pass voice services in the prior art are complicated, and the obtained data cannot analyze the specific reasons for the single-pass, which is inconvenient for subsequent processing and improvement. Therefore, there is a need for a more convenient language single-pass service evaluation method, which can subdivide the reasons for the single-pass service, so that the single-pass data can truly reflect the voice service status and be corrected in time.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method, apparatus, device and medium for locating the cause of a single-pass voice service. Specifically, a technical solution for user-level VoLTE single-pass evaluation and cause location based on MRO (measurement report sample data) is provided. This technical solution can accurately and efficiently evaluate the degree of cell single-pass on the wireless side of the network and locate the cause of single-pass at the user level only by analyzing, processing and analyzing specific field data in the MRO data, so as to guide the improvement and optimization of VoLTE voice quality.

In a first aspect, an embodiment of the present invention provides a method for locating a single-pass cause of a voice service, the method comprising:

1) Collect specified fields in the LTE network measurement report sample data, the fields include at least a voice uplink packet loss rate field and a voice downlink packet loss rate field, and any single or multiple fields in the following fields: downlink reference signal reception Power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field;

2) When the voice uplink packet loss rate field or the voice downlink packet loss rate field meets the set first threshold, it is judged that there is a voice single-pass;

3) According to the result of step 2), locate the cause of the single pass through any one or more of the following fields: the downlink reference signal received power field, the uplink coverage field, the uplink SINR field, the base station received interference power field, and the neighbor Zone Reference Signal Received Power field.

In a second aspect, an embodiment of the present invention provides a device for locating a single-pass cause of a voice service, the device comprising:

Data collection unit: used to collect the specified fields in the sample data of the LTE network measurement report, the fields include at least the voice uplink packet loss rate field and the voice downlink packet loss rate field, and any one or more of the following fields: Downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field;

Single-pass evaluation unit: used to judge whether there is a single-pass voice according to whether the voice uplink packet loss rate field or the voice downlink packet loss rate field satisfies the set first threshold;

Single-pass cause locating unit: used to locate the cause of single-pass through any one or more of the following fields: downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell Reference signal received power field.

In a third aspect, an embodiment of the present invention provides a device for locating a cause of a single call of a voice service, including: at least one processor, at least one memory, and computer program instructions stored in the memory, which are implemented when the computer program instructions are executed by the processor. As in the method of the first aspect in the above embodiment.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method of the first aspect in the foregoing embodiments is implemented.

The method, device, device, and medium for locating the cause of a single-pass voice service provided by various embodiments of the present invention can have at least one of the following advantages:

Data source is easy to obtain: the present invention is a method for judging VoTLE single-pass based on MRO data, avoiding the limitation of collecting and analyzing S1-U interface RTP data;

Easy to implement: only by analyzing the data in the MRO data, such as MR.LteScPlrULQci1 (voice uplink packet loss rate), MR.LteScPlrDLQci1 (voice downlink packet loss rate), MR.LteScRSRP (downlink reference signal received power) and other fields, can be Accurately and efficiently evaluate the cell single-pass situation on the wireless side of the network and locate the user-level single-pass reason;

Refinement of air interface reasons: after delimiting the air interface problems by traditional methods, the reasons cannot be further refined, but the present invention can further subdivide VoLTE user-level single-pass reasons: weak uplink/downlink coverage, interference, handover, TOP users, capacity, etc.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments of the present invention will be briefly introduced below. For those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

Figure 1 shows the VoLTE protocol framework in an LTE network;

Fig. 2 shows the data packet that user equipment sends to eNodeB;

Figure 3 shows measurement report sample data;

FIG. 4 shows a method for evaluating and locating a cause of a single-pass voice service according to an embodiment of the present invention;

FIG. 5 shows a field calculation priority order according to another embodiment of the present invention;

6 shows a structural diagram of a device for locating a cause of a single-pass voice service provided by an embodiment of the present invention;

FIG. 7 shows a schematic diagram of a hardware structure of a voice single-pass service device provided by an embodiment of the present invention.

Detailed ways

The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention, and are not configured to limit the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention.

It should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprises" does not preclude the presence of additional identical elements in a process, method, article, or device that includes the element.

In the prior art, a short-time single pass is defined as: the RTP packet loss rate exceeds 80% within a 5-second monitoring period. The applicant found that the MR (measurement report) sampling period is 5120ms, which is approximately equal to 5S. Meanwhile, in the existing VoLTE protocol architecture shown in FIG. 1 , the RTP packet loss is carried by the PDCP packet, that is, the number of PDCP packets corresponds to the number of RTP packets one-to-one. As shown in Figure 2, if the PDCP packet number is incremented by 1, the RTP packet number is also incremented by 1. If PDCP loses packets, RTP must lose packets. Therefore, by analyzing the PDCP sample sampling point data of MR.LteScPlrULQci1 (voice uplink packet loss rate) and MR.LteScPlrDLQci1 (voice downlink packet loss rate) in the MRO (measurement report sample) file as shown in Figure 3, it is possible to determine a single The user-level single-pass cause can be further located by combining the coverage, interference, and neighboring cell information of the sampling point at the time when the packet loss occurs in the MRO.

Through the above analysis, according to the first aspect of the present invention, in conjunction with Fig. 4, the voice single-pass service evaluation and cause location method of the present invention includes the following steps:

In step S1, the specified fields in the sample data of the LTE network measurement report are collected, and the fields include at least a voice uplink packet loss rate field and a voice downlink packet loss rate field, and any one or more of the following fields: downlink Reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field;

In step S2, when the voice uplink packet loss rate field or the voice downlink packet loss rate field meets the set first threshold, it is judged that there is a voice single-pass;

In step S3, according to the result of step S2, the cause of the single pass is located by any one or more of the following fields: downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and Neighbor Reference Signal Received Power field.

In a preferred embodiment of the present invention, the step S1 further includes data cleaning, that is, judging whether the value of the collected field is available, specifically including: when the voice uplink packet loss rate field or the voice downlink packet loss rate field is a null value, Then the data is invalid; when there are multiple rows of records in the adjacent cell reference signal received power field, only the row with the maximum value is reserved.

In another preferred embodiment of the present invention, the field collected in the step S1 further includes a time point field, which is used to identify the period of data collection.

In another preferred embodiment of the present invention, the fields collected in the step S1 further include a user equipment identification field; in the step S2, when it is determined that a single-pass voice occurs, the field further includes: when the user equipment identification field is full When the proportion of sampling points whose days are the same value is not greater than the set second threshold, it is determined that the user is not a TOP user.

In another preferred embodiment of the present invention, the reasons for judging the single pass in the step S3 specifically include:

When the value of the downlink signal received power field is less than the preset third threshold, it is determined that the single-pass reason is weak downlink coverage; or

When the value of the uplink coverage field is less than the preset fourth threshold, it is determined that the single-pass reason is weak uplink coverage; or

When the value of the uplink SINR field is less than the preset fifth threshold, or when the value of the base station received interference power field is greater than the preset sixth threshold, it is determined that the single-pass cause is interference; or

When the value of the received power field of the neighbor cell reference signal is higher than the value of the received power field of the downlink reference signal by a preset seventh threshold, it is determined that the cause of the single pass is abnormal handover.

In another preferred embodiment of the present invention, when any of the conditions for judging the single-pass cause in the step S3 are not satisfied, that is, the single-pass reason cannot be judged as weak downlink coverage, weak uplink coverage, interference or abnormal handover. In any case, the single-pass cause is judged to be high load.

In the above-mentioned embodiments of the present invention, the collected MRO data can be parsed and stored in the database according to the fields shown in Table 1:

Table 1: MRO data fields

After the data is collected, the data can be cleaned to remove the useless data rows, so that the calculation results are more accurate. To facilitate software implementation, the cleaning process can be performed sequentially in the following order:

(1) If the fields of MR.LteScPlrULQci1 and MR.LteScPlrDLQci1 are both null, it means that no VOLTE service occurs, and this row is discarded.

(2) If MR.LteNcRSRP has multiple rows of records, only the row with the maximum value is retained.

(3) For the remaining fields, if the value of each field exceeds the range, the data of this row is discarded (for the value range, please refer to Table 1).

In each of the above embodiments, 8 newly added fields shown in Table 2 can also be used to store the results of single-pass judgment and cause location: whether uplink single-pass, whether downlink single-pass, whether downlink weak coverage, whether uplink weak coverage , Whether the switching is abnormal, whether there is interference, whether it is a TOP user, whether it is a high load. The 8-field value is obtained according to the MRO data field in Table 1, the specific algorithm is shown in Table 2, and the field calculation priority is shown in Figure 5. Among them, in order to improve the calculation efficiency, the following reason judgment is only performed when the judgment of "whether the single-pass judgment of uplink/downlink" is 1.

Table 2: New 8-field algorithm

According to the priority levels shown in FIG. 5 and referring to the judgment criteria in Table 2, user-level single-pass samples can be obtained, and a "User-level Single-pass Sample Table" can be produced.

Those skilled in the art should understand that the value ranges of the fields provided in Table 1 and the thresholds provided in Table 2 for judging whether a specific single-pass reason is an example of a preferred embodiment of the present invention, It should not be considered as a limitation of the present invention.

In yet another embodiment of the present invention, according to the collected serving cell identification field (ie, the "id" field in the second row of Table 1); the single-pass data of all users in the cell can also be counted and summarized into cell-level single-pass data. pass data. Specifically, the data of each cell in the "User-Level Single-Pass Sample Table" are "whether single-pass uplink, whether single-pass downlink, whether downlink weak coverage, whether uplink weak coverage, abnormal handover, whether interference, whether high load" 8 By summarizing the fields, the "Cell-level Single-pass Table" can be obtained.

In the embodiment of the present invention, when user-level single-pass data is aggregated into cell-level single-pass data, the preferred statistical time window is hour-level, that is, hourly user single-pass data is used for aggregation.

The above-mentioned "User-level Single-pass Sample Table" and "Residential-level Single-pass Table" can be stored in the equipment and storage media provided according to the third and fourth aspects of the present invention, provide query and download links, and be embedded in daily routines. Auxiliary analysis processing is performed in the single-pass TOP cell processing flow.

It can be seen from the above embodiments that the present invention fully utilizes the advantages of MRO big data, and can evaluate the single-pass situation of VOLTE at the cell level and user level of the entire network. Only by analyzing and processing the data in the fields of MR.LteScPlrULQci1, MR.LteScPlrDLQci1, MmeUeS1apId, MR.LteScRSRP and other fields in the MRO data, it is possible to accurately and efficiently evaluate the cell single-pass situation on the wireless side of the network and locate the user-level single-pass cause. . Through the software, the user-level single-pass analysis results are processed as needed, and the cell-level uplink and downlink single-pass times, uplink and downlink weak coverage reasons, interference reasons, and TOP user reasons are directly output. At a glance, it is convenient for priority personnel to carry out targeted optimization on site.

For example, using the method of the present invention, after analyzing the MRO data of a certain cell for a certain period of time, the results shown in Table 3 are obtained: when the cell is uplink single-pass (PDCP packet loss> 80%), the downlink RSRP is normal, and the UE transmits The power headroom is seriously insufficient, the uplink coverage is weak, and the uplink and downlink are unbalanced.

After the down-tilt angle of the antenna is pressed down to shrink the coverage, the packet loss rate of the uplink PDCP is improved to about 0.8%, and the problem of the uplink single pass is solved.

table 3

As shown in Figure 6, according to the second aspect of the present invention, a device for locating a single-pass cause of a voice service includes:

The data collection unit 10 is configured to collect specified fields in the sample data of the LTE network measurement report, the fields at least include a voice uplink packet loss rate field and a voice downlink packet loss rate field, and any single or multiple fields in the following fields : Downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field;

The single-pass evaluation unit 20 is used to judge whether there is a single-pass voice according to whether the voice uplink packet loss rate field or the voice downlink packet loss rate field satisfies the set first threshold;

The single-pass cause locating unit 30 is configured to locate the cause of the single-pass through any one or more of the following fields: a downlink reference signal received power field, an uplink coverage field, an uplink SINR field, a base station received interference power field, and a neighbor Zone Reference Signal Received Power field.

In addition, the method for locating the cause of the single-pass voice service according to the above embodiments of the present invention may be implemented by a device for locating the cause of the single-pass voice service. FIG. 7 shows a schematic diagram of a hardware structure of a device for locating a cause of a single-pass voice service provided by an embodiment of the present invention.

The device for locating the cause of a single call of a voice service may include a processor 401 and a memory 402 storing computer program instructions.

Specifically, the above-mentioned processor 401 may include a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits implementing the embodiments of the present invention.

Memory 402 may include mass storage for data or instructions. By way of example and not limitation, memory 402 may include a Hard Disk Drive (HDD), a floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape or Universal Serial Bus (USB) drive or two or more A combination of more than one of the above. Memory 402 may include removable or non-removable (or fixed) media, where appropriate. Memory 402 may be internal or external to the data processing device, where appropriate. In certain embodiments, memory 402 is non-volatile solid state memory. In particular embodiments, memory 402 includes read only memory (ROM). Where appropriate, the ROM may be a mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM) or flash memory or A combination of two or more of the above.

The processor 401 reads and executes the computer program instructions stored in the memory 402 to implement any one of the methods for locating the cause of a single-pass voice service in the above-mentioned embodiments.

In one example, the voice service single-pass cause locating device may further include a communication interface 403 and a bus 410 . Among them, as shown in FIG. 7 , the processor 401 , the memory 402 , and the communication interface 403 are connected through the bus 410 and complete the mutual communication.

The communication interface 403 is mainly used to implement communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.

The bus 410 includes hardware, software, or both, coupling the components of the voice traffic single-pass cause locating device to each other. By way of example and not limitation, the bus may include Accelerated Graphics Port (AGP) or other graphics bus, Enhanced Industry Standard Architecture (EISA) bus, Front Side Bus (FSB), HyperTransport (HT) Interconnect, Industry Standard Architecture (ISA) Bus, Infiniband Interconnect, Low Pin Count (LPC) Bus, Memory Bus, Microchannel Architecture (MCA) Bus, Peripheral Component Interconnect (PCI) Bus, PCI-Express (PCI-X) Bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of the above. Bus 410 may include one or more buses, where appropriate. Although embodiments of the present invention describe and illustrate a particular bus, the present invention contemplates any suitable bus or interconnect.

In addition, in combination with the method for locating the cause of a single-pass voice service in the foregoing embodiment, the embodiment of the present invention may provide a computer-readable storage medium for implementation. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by the processor, any one of the above-mentioned methods for locating a single-pass cause of a voice service is implemented.

It is to be understood that the present invention is not limited to the specific arrangements and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above-described embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the sequence of steps after comprehending the spirit of the present invention.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.

It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be different from the order in the embodiments, or several steps may be performed simultaneously.

The above are only specific implementations of the present invention. Those skilled in the art can clearly understand that, for the convenience and simplicity of the description, the specific working process of the above-described systems, modules and units may refer to the foregoing method embodiments. The corresponding process in , will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all cover within the protection scope of the present invention.

Claims (11)

1. a method for locating the cause of a single-pass voice service, characterized in that the method comprises: 1) Collect specified fields in the LTE network measurement report sample data, the specified fields include at least a voice uplink packet loss rate field and a voice downlink packet loss rate field, and any single or multiple fields in the following fields: downlink reference signal Received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field; 2) When the voice uplink packet loss rate field or the voice downlink packet loss rate field meets the set first threshold, it is judged that there is a voice single-pass; 3) Locate the cause of the single-pass voice through any one or more of the following fields: downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field, and adjacent cell reference signal reception Power field. 2. method according to claim 1, is characterized in that, described step 1) also comprises: when voice uplink packet loss rate field or voice downlink packet loss rate field is null, then this data is invalid; When there are multiple rows of records in the reference signal received power field, only the row with the maximum value is reserved. 3 . The method according to claim 2 , wherein the field collected in the step 1) further includes a time point field, which is used to identify the period of data collection. 4 . 4. The method according to claim 3, wherein the field collected in the step 1) also includes a user equipment identification field; in the step 2), when it is judged that a single-pass voice occurs, it also includes: When the proportion of sampling points in which the identifier field of the user equipment is the same value throughout the day is not greater than the set second threshold, it is determined that the user is not a TOP user. 5. The method according to claim 4, wherein the step 3) comprises: When the value of the downlink signal received power field is less than the preset third threshold, it is determined that the single-pass reason is weak downlink coverage; or When the value of the uplink coverage field is less than the preset fourth threshold, it is determined that the single-pass reason is weak uplink coverage; or When the value of the uplink SINR field is less than the preset fifth threshold, or when the value of the base station received interference power field is greater than the preset sixth threshold, it is determined that the single-pass cause is interference; or When the value of the received power field of the neighbor cell reference signal is higher than the value of the received power field of the downlink reference signal by a preset seventh threshold, it is determined that the cause of the single pass is abnormal handover. 6. method according to claim 5, is characterized in that: when described step 3) in single-pass reason can not be judged to be any in downlink weak coverage, uplink weak coverage, interference or handover abnormality, then judge the single-pass reason. The common cause is high load. 7. The method according to any one of claims 1-6, wherein the field collected in the step 1) further comprises a serving cell identification field; the method further comprises: according to the judgment result of the step 3) , count the single-pass data of all users in the cell, and summarize it into cell-level single-pass data. 8 . The method according to claim 7 , wherein when the single-pass data of all users in the cell is counted, hourly user single-pass data is used for aggregation. 9 . 9. A device for locating a single-pass cause of a voice service, wherein the device comprises: A data collection unit, configured to collect specified fields in the sample data of the LTE network measurement report, the fields at least include a voice uplink packet loss rate field and a voice downlink packet loss rate field, and any one or more of the following fields: Downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and adjacent cell reference signal received power field; A single-pass evaluation unit, configured to judge whether there is a single-pass voice according to whether the voice uplink packet loss rate field or the voice downlink packet loss rate field satisfies the set first threshold; A single-pass cause locating unit, configured to locate the cause of the single-pass voice through any one or more of the following fields: downlink reference signal received power field, uplink coverage field, uplink SINR field, base station received interference power field and Neighbor Reference Signal Received Power field. 10. A single-pass reason location device for voice services, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, when the computer program instructions are executed by the processor When the method according to any one of claims 1-8 is implemented. 11. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, when the computer program instructions are executed by a processor, the method according to any one of claims 1-8 is implemented.