Method for controlling random access power of UE, UE and computer storage medium

Abstract

Disclosed are a method for controlling random access power of a user equipment (UE), the UE and a computer storage medium, wherein the method comprises: receiving system broadcast information sent from a network side; acquiring a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed comprises at least one of the following: a power adjustment parameter for random access of the UE, a power climbing step adjustment parameter, and a random access fallback adjustment parameter; based on the scaling factor corresponding to the UE speed, correcting the power of the UE during random access and correcting the preamble sending time during random access.

Description

Technical Field

[0001] The present disclosure relates to the field of information processing technology, and in particular to a method for controlling random access power of a user equipment (UE), a UE and a computer storage medium. Background Art

[0002] Currently, in New Radio (NR), system broadcast information is divided into minimum system information (MSI) and other system information (OSI), where OSI can be sent by the network side based on UE request, rather than the traditional periodic broadcast. For UE request, MSG1 or MSG3 of the random access process can be used to indicate the network side to request OSI.

[0003] For UEs with high mobile speed, in order for the UE to quickly select neighbor cells, it is necessary to obtain OSI as soon as possible to meet the idle state (idle) mobility requirements. For handover scenarios, UEs with high mobile speed also need to quickly handover to meet the handover performance requirements. Therefore, it is necessary to shorten the random access time for high-speed UEs. Summary of the invention

[0004] To solve the above technical problems, the embodiments of the present disclosure provide a method for controlling the random access power of a UE, a UE and a computer storage medium.

[0005] The present disclosure provides a method for controlling random access power of a user equipment UE, which is applied to the UE. The method includes:

[0006] Receive system broadcast information from the network side;

[0007] Acquire a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed includes at least one of the following: a power adjustment parameter for random access of the UE, a power climbing step adjustment parameter, and a random access fallback adjustment parameter;

[0008] Based on the scaling factor corresponding to the UE speed, the power of the UE in the random access process is corrected and the preamble code sending time in the random access process is corrected.

[0009] The present disclosure provides a UE, including:

[0010] A communication unit receives system broadcast information sent from the network side;

[0011] A processing unit obtains a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed includes at least one of the following: a power adjustment parameter for random access of the UE, a power climbing step adjustment parameter, and a random access fallback adjustment parameter; based on the scaling factor corresponding to the UE speed, the power of the UE in the random access process is corrected, and the preamble code sending time in the random access process is corrected.

[0012] A user equipment UE provided in an embodiment of the present disclosure includes: a processor and a memory for storing a computer program that can be run on the processor,

[0013] Wherein, the processor is used to execute the steps of the aforementioned method when running the computer program.

[0014] An embodiment of the present disclosure provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can implement the aforementioned method steps when executed.

[0015] The technical solution of the disclosed embodiment can determine the corresponding scaling factor based on the speed of the UE, and then perform random access processing based on at least one parameter of the power adjustment parameter, power climbing step adjustment parameter, and random access fallback adjustment parameter of the UE in the scaling factor. In this way, the random access process can be combined with the speed of the UE, thereby adjusting the progress of the random access process, achieving the purpose of quickly accessing the network and improving mobile robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for controlling random access power of a UE provided in an embodiment of the present disclosure;

[0017] Figure 2 This is a schematic diagram of the structure of the user equipment according to the embodiment of the present disclosure;

[0018] Figure 3 A schematic diagram of a hardware architecture of an embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure.

[0020] Embodiment 1

[0021] The present disclosure provides a method for controlling random access power of a UE, which is applied to a UE, such as Figure 1 As shown, the method includes:

[0022] Step 101: receiving system broadcast information sent from the network side;

[0023] Step 102: Acquire a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed includes at least one of the following: a power adjustment parameter for random access of the UE, a power climbing step adjustment parameter, and a random access fallback adjustment parameter;

[0024] Step 103: Based on the scaling factor corresponding to the UE speed, the power of the UE during the random access process is corrected and the preamble sending time during the random access process is corrected.

[0025] First, the UE receives information sent by the network side, which may include: the network side broadcasts a scaling factor based on the UE speed through system broadcast;

[0026] The power adjustment parameter for random access of the UE includes: a factor or offset of a target power of receiving the initial preamble code sent by the UE for random access;

[0027] The power climbing step length adjustment parameter includes: a factor or bias of the power climbing step length when the UE performs random access;

[0028] The adjustment parameters of the random access fallback include: a factor or a bias of the random access fallback.

[0029] Specifically, the scaling factor includes at least one of the following: a factor or bias of a receiving target power of a preamble code PREAMBLE initially sent by a UE for random access, a factor or bias of a random access power climbing step, and a factor or bias of a random access fallback.

[0030] It can also be understood that a series of scaling factors may be sent down by the network side, that is, different scaling factors corresponding to multiple UE speeds or multiple UE speed ranges, and then the UE may select the corresponding scaling factor as the scaling factor for random access correction according to its current moving speed, that is, as follows:

[0031] The acquiring the scaling factor corresponding to the UE speed includes:

[0032] The UE determines a corresponding speed range based on the moving speed;

[0033] Based on the speed range corresponding to the UE, a corresponding scaling factor is selected.

[0034] Here, the UE speed can be a relative value or an absolute UE speed value or range, corresponding to a scaling factor or offset. For example, a relative speed, such as the UE mobility state, normal, medium speed, and high speed, corresponds to a scaling factor or offset respectively. The UE determines which speed level to use. An absolute speed range, such as a km / h to b km / h, corresponds to a scaling factor or offset, and the UE determines which scaling factor or offset to use based on its actual speed.

[0035] The following is a detailed description of how to use the various parameters in the aforementioned scaling factors:

[0036] The first method is to correct the receiving target power of the initial transmission preamble:

[0037] The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes:

[0038] The reception target power of the initial transmission preamble code for random access based on the UE is multiplied by a factor of the reception target power of the initial transmission preamble code for random access to obtain the corrected reception target power of the initial transmission preamble code.

[0039] or,

[0040] The reception target power of the initial transmission preamble code for random access based on the UE is added to the offset of the reception target power of the initial transmission preamble code for random access to obtain the corrected reception target power of the initial transmission preamble code.

[0041] That is to say, the UE corrects the receiving target power of the PREAMBLE initially sent by the random access UE during the random access process, and the receiving target power of the PREAMBLE initially sent by the random access UE is corrected to: the receiving target power of the PREAMBLE initially sent by the random access UE broadcast in the system broadcast x the factor of the receiving target power of the PREAMBLE initially sent by the random access UE, or the receiving target power of the PREAMBLE initially sent by the random access UE broadcast in the system broadcast + the bias of the receiving target power of the PREAMBLE initially sent by the random access UE.

[0042] The second method is to modify the power climbing step size when the UE performs random access:

[0043] The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes:

[0044] A power climbing step size when the UE performs random access is multiplied by a factor of the power climbing step size when the UE performs random access to obtain a corrected power climbing step size when the UE performs random access.

[0045] or,

[0046] A corrected power climbing step size when the UE performs random access is obtained by adding the power climbing step size when the UE performs random access to the offset of the power climbing step size when the UE performs random access.

[0047] Here, the power climbing step size can be understood as the power climbing step size of random access modified by the UE during the random access process. Accordingly, the UE modifies the power climbing step size of random access during the random access process, and the power climbing step size of random access is modified to: the power climbing step size of random access broadcasted in the system broadcast x the factor of the power climbing step size of random access, or the power climbing step size of random access broadcasted in the system broadcast + the bias of the power climbing step size of random access.

[0048] The third method is to modify the random access fallback value:

[0049] This correction process may include two methods. The first method is to obtain a modified random access backoff reference value by multiplying the random access backoff factor based on the random access backoff indicated by the network side; or to obtain a modified random access backoff reference value by adding the random access backoff bias based on the random access backoff indicated by the network side;

[0050] A modified random access backoff value is generated according to the modified random access backoff reference value; wherein the modified random access backoff value is greater than zero and less than the modified random access backoff reference value.

[0051] That is, the UE modifies the random access fallback during the random access process, and the random access fallback reference value is: the random access fallback indicated in the random access response (RAR) x the factor of the random access fallback, or the random access fallback indicated in the RAR + the offset of the random access fallback;

[0052] Then, according to the modified random access backoff reference value, a random access backoff value between 0 and the modified random access backoff reference value is randomly generated.

[0053] Second way:

[0054] A modified random access backoff is obtained by multiplying the randomly generated random access backoff by a factor of the random access backoff;

[0055] Alternatively, a modified random access backoff is obtained by adding a randomly generated random access backoff to an offset of the random access backoff.

[0056] The difference from the first method is that this method directly calculates the random access backoff, that is, the UE corrects the random access backoff during the random access process, and the random access backoff is corrected to: randomly generated random access backoff x random access backoff factor, or randomly generated random access backoff + random access backoff bias.

[0057] Based on the previous introduction, the corrected receiving target power of the initial transmission preamble, the corrected power climbing step size when the UE performs random access, and the corrected random access fallback can be obtained to perform the transmission processing of the preamble in random access. Specifically:

[0058] Determine the transmission power of the preamble based on at least one of the revised receiving target power of the initial transmission preamble and the revised power climbing step size when the UE performs random access; and determine the transmission time of the preamble based on the revised random access backoff.

[0059] That is, the preamble transmit power can be obtained by adding the corrected preamble receiving target power and the corrected power climbing step size when the UE performs random access. Of course, there may be other processing methods, which will not be exhaustively listed here.

[0060] It can be seen that by adopting the above solution, the corresponding scaling factor can be determined based on the speed of the UE, and then the random access processing can be performed based on at least one parameter of the power adjustment parameter, step adjustment parameter, and random access fallback adjustment parameter of the UE in the scaling factor. In this way, the random access process can be combined with the speed of the UE, thereby adjusting the progress of the random access process, achieving the purpose of quickly accessing the network and improving the robustness of mobility.

[0061] Embodiment 2

[0062] The present disclosure provides a UE, such as Figure 2 As shown, the UE includes:

[0063] The communication unit 21 receives system broadcast information sent from the network side;

[0064] The processing unit 22 obtains a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed includes at least one of the following: a power adjustment parameter for random access of the UE, a power climbing step adjustment parameter, and a random access fallback adjustment parameter; based on the scaling factor corresponding to the UE speed, the power of the UE in the random access process is corrected, and the time when the preamble code is sent in the random access process is corrected.

[0065] First, the UE receives information sent by the network side, which may include: the network side broadcasts a scaling factor based on the UE speed through system broadcast;

[0066] The power adjustment parameter for random access of the UE includes: a factor or offset of a target power of receiving the initial preamble code sent by the UE for random access;

[0067] The power climbing step length adjustment parameter includes: a factor or bias of the power climbing step length when the UE performs random access;

[0068] The adjustment parameters of the random access fallback include: a factor or a bias of the random access fallback.

[0069] Specifically, the scaling factor includes at least one of the following: a factor or bias of a receiving target power of a preamble code PREAMBLE initially sent by a UE for random access, a factor or bias of a random access power climbing step, and a factor or bias of a random access fallback.

[0070] It can also be understood that a series of scaling factors may be sent down by the network side, that is, different scaling factors corresponding to multiple UE speeds or multiple UE speed ranges, and then the UE may select the corresponding scaling factor as the scaling factor for random access correction according to its current moving speed, that is, as follows:

[0071] The processing unit 22 determines a corresponding speed range based on the moving speed;

[0072] Based on the speed range corresponding to the UE, a corresponding scaling factor is selected.

[0073] Here, the UE speed can be a relative value or an absolute UE speed value or range, corresponding to a scaling factor or offset. For example, a relative speed, such as the UE mobility state, normal, medium speed, and high speed, corresponds to a scaling factor or offset respectively. The UE determines which speed level to use. An absolute speed range, such as a km / h to b km / h, corresponds to a scaling factor or offset, and the UE determines which scaling factor or offset to use based on its actual speed.

[0074] The following is a detailed description of how to use the various parameters in the aforementioned scaling factors:

[0075] The first method is to correct the receiving target power of the initial transmission preamble:

[0076] The processing unit 22 obtains a corrected reception target power of the initial transmission preamble code based on the multiplication of the reception target power of the initial transmission preamble code for random access by a factor of the reception target power of the initial transmission preamble code for random access.

[0077] or,

[0078] The reception target power of the initial transmission preamble code for random access based on the UE is added to the offset of the reception target power of the initial transmission preamble code for random access to obtain the corrected reception target power of the initial transmission preamble code.

[0079] That is to say, the UE corrects the receiving target power of the PREAMBLE initially sent by the random access UE during the random access process, and the receiving target power of the PREAMBLE initially sent by the random access UE is corrected to: the receiving target power of the PREAMBLE initially sent by the random access UE broadcast in the system broadcast x the factor of the receiving target power of the PREAMBLE initially sent by the random access UE, or the receiving target power of the PREAMBLE initially sent by the random access UE broadcast in the system broadcast + the bias of the receiving target power of the PREAMBLE initially sent by the random access UE.

[0080] The second method is to modify the power climbing step size when the UE performs random access:

[0081] The processing unit 22 obtains a corrected power climbing step size when the UE performs random access based on the power climbing step size when the UE performs random access and multiplies the power climbing step size when the UE performs random access by a factor of the power climbing step size when the UE performs random access.

[0082] or,

[0083] A corrected power climbing step size when the UE performs random access is obtained by adding the power climbing step size when the UE performs random access to the offset of the power climbing step size when the UE performs random access.

[0084] Here, the power climbing step size can be understood as the power climbing step size of random access modified by the UE during the random access process. Accordingly, the UE modifies the power climbing step size of random access during the random access process, and the power climbing step size of random access is modified to: the power climbing step size of random access broadcasted in the system broadcast x the factor of the power climbing step size of random access, or the power climbing step size of random access broadcasted in the system broadcast + the bias of the power climbing step size of random access.

[0085] The third method is to modify the random access fallback value:

[0086] This correction process may include two methods. In the first method, the processing unit 22 obtains a modified random access backoff reference value by multiplying the random access backoff factor based on the random access backoff indicated by the network side; or obtains a modified random access backoff reference value by adding the random access backoff bias based on the random access backoff indicated by the network side;

[0087] A modified random access backoff value is generated according to the modified random access backoff reference value; wherein the modified random access backoff value is greater than zero and less than the modified random access backoff reference value.

[0088] That is, the UE modifies the random access fallback during the random access process, and the random access fallback reference value is: the random access fallback indicated in the RAR x the factor of the random access fallback, or the random access fallback indicated in the RAR + the offset of the random access fallback;

[0089] Then, according to the modified random access backoff reference value, a random access backoff value between 0 and the modified random access backoff reference value is randomly generated.

[0090] Second way:

[0091] The processing unit 22 obtains a modified random access backoff by multiplying the randomly generated random access backoff by a factor of the random access backoff;

[0092] Alternatively, a modified random access backoff is obtained by adding a randomly generated random access backoff to an offset of the random access backoff.

[0093] The difference from the first method is that this method directly calculates the random access backoff, that is, the UE corrects the random access backoff during the random access process, and the random access backoff is corrected to: randomly generated random access backoff x random access backoff factor, or randomly generated random access backoff + random access backoff bias.

[0094] Based on the previous introduction, the corrected receiving target power of the initial transmission preamble, the corrected power climbing step size when the UE performs random access, and the corrected random access fallback can be obtained to perform the transmission processing of the preamble in random access. Specifically:

[0095] The processing unit 22 determines the transmission power of the preamble code based on at least one of the revised reception target power of the initial transmission preamble code and the revised power climbing step size when the UE performs random access; and determines the transmission time of the preamble code based on the revised random access backoff.

[0096] That is, the preamble transmit power can be obtained by adding the corrected preamble receiving target power and the corrected power climbing step size when the UE performs random access. Of course, there may be other processing methods, which will not be exhaustively listed here.

[0097] It can be seen that by adopting the above solution, the corresponding scaling factor can be determined based on the speed of the UE, and then the random access processing can be performed based on at least one parameter of the power adjustment parameter, step adjustment parameter, and random access fallback adjustment parameter of the UE in the scaling factor. In this way, the random access process can be combined with the speed of the UE, thereby adjusting the progress of the random access process, achieving the purpose of quickly accessing the network and improving the robustness of mobility.

[0098] The present disclosure also provides a hardware structure of a user device, such as Figure 3 As shown, the system includes: at least one processor 31, a memory 32, and at least one network interface 33. The various components are coupled together through a bus system 34. It can be understood that the bus system 34 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 34 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Figure 3 Various buses are labeled as bus system 34 .

[0099] It can be understood that the memory 32 in the embodiment of the present disclosure may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories.

[0100] In some embodiments, the memory 32 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

[0101] Operating system 321 and application program 322 .

[0102] The processor 31 is configured to be capable of processing the method steps of the aforementioned embodiment 1, which will not be described in detail here.

[0103] An embodiment of the present disclosure provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and when the computer executable instructions are executed, the method steps of the above-mentioned embodiment 1 are implemented.

[0104] If the above-mentioned device of the embodiment of the present disclosure is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present disclosure can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a magnetic disk or an optical disk. In this way, the embodiment of the present disclosure is not limited to any specific combination of hardware and software.

[0105] Accordingly, an embodiment of the present disclosure further provides a computer storage medium, in which a computer program is stored, and the computer program is configured to execute the method of the embodiment of the present disclosure.

[0106] Although the preferred embodiments of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and thus, the scope of the present disclosure should not be limited to the above embodiments.

Claims

1. A method for controlling random access power of a user equipment UE, applied to the UE, the method comprising: Receive system broadcast information from the network side; Acquire a scaling factor corresponding to the UE speed from the system broadcast information; wherein the scaling factor corresponding to the UE speed includes an adjustment parameter for random access fallback and at least one of the following: a power adjustment parameter for random access of the UE and a power climbing step adjustment parameter; Based on the scaling factor corresponding to the UE speed, correct the power of the UE during random access and correct the preamble sending time during the random access; The power adjustment parameter for random access of the UE includes: a factor or offset of a target power of receiving the initial preamble code sent by the UE for random access; The power climbing step length adjustment parameter includes: a factor or bias of the power climbing step length when the UE performs random access; The adjustment parameters of the random access fallback include: a factor or a bias of the random access fallback; Wherein, the method further comprises: The modified random access backoff reference value is obtained by multiplying the random access backoff factor based on the random access backoff indicated by the network side; or the modified random access backoff reference value is obtained by adding the random access backoff indicated by the network side to the bias of the random access backoff; Generate a modified random access backoff value according to the modified random access backoff reference value; wherein the modified random access backoff value is greater than zero and less than the modified random access backoff reference value; The correcting the power of the UE during the random access process and the correcting the preamble sending time during the random access process include: The transmission power of the preamble is determined based on the revised reception target power of the initial transmission preamble and the revised power climbing step size when the UE performs random access; and the transmission time of the preamble is determined based on the revised random access backoff.

2. The method according to claim 1, wherein: The acquiring the scaling factor corresponding to the UE speed includes: The UE determines a corresponding speed range based on the moving speed; Based on the speed range corresponding to the UE, a corresponding scaling factor is selected.

3. The method according to claim 1, wherein: The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes: The reception target power of the initial transmission preamble code for random access based on the UE is multiplied by a factor of the reception target power of the initial transmission preamble code for random access to obtain the corrected reception target power of the initial transmission preamble code.

4. The method according to claim 1, wherein: The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes: The reception target power of the initial transmission preamble code for random access based on the UE is added to the offset of the reception target power of the initial transmission preamble code for random access to obtain the corrected reception target power of the initial transmission preamble code.

5. The method according to claim 1, wherein: The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes: A power climbing step size when the UE performs random access is multiplied by a factor of the power climbing step size when the UE performs random access to obtain a corrected power climbing step size when the UE performs random access.

6. The method according to claim 1, wherein: The correcting the power of the UE in the random access process based on the scaling factor corresponding to the UE speed includes: A corrected power climbing step size when the UE performs random access is obtained by adding the power climbing step size when the UE performs random access to the offset of the power climbing step size when the UE performs random access.

7. A user equipment UE, comprising: A communication unit receives system broadcast information sent from the network side; A processing unit is configured to obtain, from the system broadcast information, a scaling factor corresponding to the UE speed; wherein the scaling factor corresponding to the UE speed includes an adjustment parameter for random access fallback and at least one of the following: a power adjustment parameter for random access by the UE and a power climbing step adjustment parameter; based on the scaling factor corresponding to the UE speed, the power of the UE in the random access process is corrected and the preamble code sending time in the random access process is corrected; The power adjustment parameter for random access of the UE includes: a factor or offset of a target power of receiving the initial preamble code sent by the UE for random access; The power climbing step length adjustment parameter includes: a factor or bias of the power climbing step length when the UE performs random access; The adjustment parameters of the random access fallback include: a factor or a bias of the random access fallback; The processing unit obtains a modified random access fallback reference value by multiplying the random access fallback factor based on the random access fallback indicated by the network side; or obtains a modified random access fallback reference value by adding the random access fallback indicated by the network side to the bias of the random access fallback; Generate a modified random access backoff value according to the modified random access backoff reference value; wherein the modified random access backoff value is greater than zero and less than the modified random access backoff reference value; The processing unit determines the transmission power of the preamble code based on the revised receiving target power of the initial transmission preamble code and the revised power climbing step size when the UE performs random access; and determines the sending time of the preamble code based on the revised random access backoff.

8. The UE according to claim 7, wherein: The processing unit determines a corresponding speed range based on the moving speed; Based on the speed range corresponding to the UE, a corresponding scaling factor is selected.

9. The UE according to claim 7, wherein: The processing unit obtains a corrected reception target power of the initial transmission preamble code based on the reception target power of the initial transmission preamble code for random access of the UE multiplied by a factor of the reception target power of the initial transmission preamble code for random access.

10. The UE according to claim 7, wherein: The processing unit obtains a corrected reception target power of the initial transmission preamble code based on the reception target power of the initial transmission preamble code for random access of the UE and the addition of the offset of the reception target power of the initial transmission preamble code for random access.

11. The UE according to claim 7, wherein: The processing unit obtains a corrected power climbing step size when the UE performs random access based on the power climbing step size when the UE performs random access and multiplies it by a factor of the power climbing step size when the UE performs random access.

12. The UE according to claim 7, wherein: The processing unit obtains a corrected power climbing step size when the UE performs random access based on the power climbing step size when the UE performs random access and adds the offset of the power climbing step size when the UE performs random access.

13. A user equipment UE, comprising: a processor and a memory for storing a computer program capable of being executed on the processor, Wherein, the processor is used to execute the steps of the method according to any one of claims 1 to 6 when running the computer program.

14. A computer storage medium storing computer executable instructions, wherein the computer executable instructions, when executed, implement the steps of the method according to any one of claims 1 to 6.

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