CN114071555A - Cell switching evaluation method, device, equipment and storage medium - Google Patents

Abstract

The embodiment of the invention relates to the technical field of wireless communication, and discloses a cell switching evaluation method, a device, equipment and a storage medium, wherein the method comprises the following steps: acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network; the first cell and the second cell are a cell pair; the MR data comprises time information and information of two cells; according to the information, the UE is respectively identified that the switching of the first cell occurs at the first switching time and the switching of the second cell occurs at the second switching time; and if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that an asynchronous switching event occurs in the cell pair. Through the mode, the embodiment of the invention realizes the comprehensive and accurate discovery and evaluation of the asynchronous switching problem of the first cell and the corresponding second cell in the network, saves the expenditure cost and improves the evaluation efficiency.

Description

Cell switching evaluation method, device, equipment and storage medium

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a cell switching evaluation method, a device, equipment and a storage medium.

Background

In the process of 5G communication network construction, considering the evolution of the operator network and minimizing the large-scale investment in the initial stage, before the 5G traffic in the wireless communication network does not substantially exceed the 4G traffic, the networking mode of the 5G network generally adopts the NSA (non-stand alone networking) mode, in which the access network is based on the dual connectivity technology, so that the 4G base station is dependent on the 5G base station, or the 5G base station is dependent on the 4G base station to provide the control channel. In the NSA networking mode, an EPC (Evolved Packet Core ) + LTE (Long Term Evolution, Long Term Evolution access network) + NR (New Radio, New air interface) mode is also common, that is, a non-independent networking mode mainly including a 4G Core network and a 4G Radio access network. In this case a 5G User terminal (UE) will simultaneously connect the 4G and 5G networks, the 4G network typically being used to carry information for the control plane and the 5G network typically being used to carry information for the User plane.

The characteristics of the 4G/5G dual connectivity of the current 5G users put higher demands on the mobility management of the network: the switching of the 4G LTE connection approximately affects the user perception rate for 4 seconds, the switching of the 5G NR connection approximately affects the user perception rate for 2 seconds, and if the LTE and NR switching are asynchronous and the time difference of the switching is large, the user experiences two times of rate sudden drop and affects the 5G user experience. Therefore, it is necessary to timely find out the asynchronous handover problem of the 5G NR cell and the LTE anchor cell corresponding to the same.

The existing technical scheme is mainly based on a large amount of road tests, and the problem of asynchronous switching of the 5G NR cell and the corresponding LTE anchor point cell is found through manual analysis of test data.

In the process of implementing the embodiment of the present invention, the inventors found that: according to the technical scheme, a large amount of manpower, material resources and financial resources are consumed, the resource cost is greatly wasted, the collected samples have obvious limitations, the cell switching condition of the tested road can be evaluated only, and the evaluation and analysis on the whole switching synchronism in the network cannot be carried out.

Disclosure of Invention

In view of the foregoing problems, embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for evaluating a cell handover, so as to solve the problems in the prior art that a large amount of resource cost is wasted and the limitation is too large when evaluating handover synchronization.

According to an aspect of the embodiments of the present invention, there is provided a cell handover evaluation method, including:

acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

identifying that the UE is switched to a first cell at a first switching time according to the time information and the first cell information in the MR data;

identifying that the UE is switched to the second cell at a second switching time according to the time information and the second cell information in the MR data;

and if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that an asynchronous switching event occurs in the cell pair.

According to another aspect of the embodiments of the present invention, there is provided a cell handover evaluation apparatus, including:

the acquisition module is used for acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

a first identification module, configured to identify that the UE performs handover of the first cell at a first handover time according to the time information and the first cell information in the MR data;

a second identification module, configured to identify that the UE performs handover of the second cell at a second handover time according to the time information and the second cell information in the MR data;

and the judging module is used for judging that an asynchronous switching event occurs to the cell pair once when the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value.

According to another aspect of the embodiments of the present invention, there is provided a cell handover evaluation device, including: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;

the memory is configured to store at least one executable instruction that causes the processor to perform the operations of the cell handover evaluation method.

According to another aspect of the embodiments of the present invention, there is provided a computer-readable storage medium, in which at least one executable instruction is stored, and when the executable instruction is executed on a cell handover evaluation device/apparatus, the cell handover evaluation device/apparatus executes the operations of the cell handover evaluation method.

The embodiment of the invention evaluates each cell switching condition by utilizing MR data of an evaluation network, wherein the MR data comprises a large amount of data such as cell switching related time information and cell information before and after switching reported by user terminal measurement, and the data is analyzed and compared, so that the occurrence of all cell switching conditions can be detected more comprehensively and accurately, and further, the asynchronous switching event of a cell can be accurately judged by comparing the switching time of two cells connected by a double-connection user terminal, thereby comprehensively and accurately finding out the asynchronous switching problem of a first cell and a corresponding second cell in the evaluation network.

Drawings

The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic flow chart illustrating a cell handover evaluation method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cell handover evaluation apparatus according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a cell handover evaluation device according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein.

The embodiment of the invention is mainly applied to the 5G network scene of the NSA networking mode, when a 5G user terminal accesses a wireless network to carry out 5G service, the 4G network and the 5G network are connected simultaneously, the 4G network is used for bearing information of a control plane, the 5G network is used for bearing information of a user plane, and the 5G user terminal uses an EPC core network of the 4G. A 4G LTE cell (LTE cell for short) and a 5G NR cell (NR cell for short) connected to a user terminal are a cell pair, and the user terminal measures the NR cell and the LTE cell at the same time and reports a measurement report. Therefore, in a certain analysis area, that is, in an evaluation network, two types of MR (Measurement Report) data, namely 4G and 5G, reported by each user terminal are obtained, and correlation analysis is performed, so that each NR cell and the corresponding LTE cell switching synchronization can be evaluated.

Fig. 1 shows a flowchart of a cell handover evaluation method according to an embodiment of the present invention. The cell handover evaluation method provided by the embodiment of the present invention is usually implemented on a wireless side of a communication network, and is typically specifically implemented by a dedicated cell handover evaluation device/apparatus. The cell switching evaluation device/equipment is provided with a database, and the MR data of all 4G LTE sites and the MR data of 5G NR sites in the evaluation network are stored on the database. The cell switching evaluation device/equipment can be used for acquiring MR data by a docking server, and extracting, adjusting, correlating and analyzing the MR data, thereby judging and evaluating the switching synchronicity of each NR cell and the LTE cell corresponding to the NR cell. As shown in fig. 1, the method comprises the steps of:

step 110: acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data includes time information, the first cell information, and the second cell information.

Specifically, the first cell is an NR cell, and the second cell is an LTE cell.

As described above, in a 5G network scenario of NSA networking, a certain analysis area (defined as an evaluation network in the embodiment of the present invention) includes a plurality of 4G LTE sites (LTE sites for short) and 5G NR sites (NR sites for short), where each site has a plurality of cells, and each site has MR sampling data reported by each UE under the site. The UE is connected with a cell pair of an NR cell and an LTE cell at the same time, and measures and reports 4G MR data and 5G MR data, correspondingly, the MR data of the LTE station comprises 4GMR data reported by each UE under the station, and the MR data of the NR station comprises 5GMR data reported by each UE under the station. Preferably, the MR data of all LTE sites is stored in one 4G FTP (File Transfer Protocol) server, and the MR data of all NR sites is stored in one 5G FTP server, although both MR data may be stored in one FTP server.

Preferably, step 110 is preceded by step 100: acquiring MR data of all stations in the evaluation network, extracting evaluation related fields, respectively acquiring first MR data and second MR data after extraction, adjusting and associating the first MR data and the second MR data, and acquiring MR data of the evaluation network after data association.

The first MR data is 5G MR data, and the second MR data is 4G MR data.

Specifically, the step 100 may include the following steps:

step 101: acquiring MR data of all LTE sites and NR sites in an evaluation network in a preset period, and extracting evaluation related fields to obtain extracted MR data, wherein the extracted MR data comprises 4G MR data and 5G MR data.

Preferably, the system (such as the above cell switching evaluation apparatus/device) may interface with the FTP server every 15 minutes, acquire MR data of all LTE sites and NR sites in the evaluation network with a granularity of 15 minutes, and perform data extraction on the MR data of all LTE sites and the MR data of all NR sites respectively to obtain extracted 4R MR data and 5G MR data.

Specifically, the evaluation-related fields extracted from the MR data include:

1. fields extracted from 4G MR data (i.e. MR data of all LTE stations):

ltetimesamp: the time when the UE generates the measurement sampling point,

Ltemmecode: MME (Mobility Management Entity) code of MME (Mobility Management Entity) connected to UE (user Equipment),

Ltemmegroupid: MME group identification of MME connected with UE,

Ltemmeues1apid: identity of the UE on the S1 interface of the MME side,

Ltescrsrp: the signal strength of the 4G serving cell measured by the UE,

Ltesitid: LTE station number,

Ltescearfcn: frequency point number of LTE serving cell,

Ltescpci: a physical cell identity of an LTE serving cell;

optionally, the following fields may be further extracted:

ltesctaddv: the signal propagation time from the UE to the serving cell is a main index reflecting the distance between the UE and the serving cell,

Ltescaoa: the reference azimuth angle of the UE relative to the communication service cell should be north and counterclockwise.

2. Fields extracted from the 5G MR data (i.e., MR data of all NR sites):

mr.5gtimestamp: the time when the UE generates the measurement sampling point,

Mr.5gmmecode: MME code of MME connected to UE,

MR.5GMmeGroupid: MME group identification of MME connected with UE,

Mr.5gmmeuesiapld: identity of the UE on the S1 interface of the MME side,

Mr.5gscrrp: the signal strength of the 5G serving cell measured by the UE,

Mr.5gsiteid: NR site number,

Mr.5gscearfcn: frequency point number of NR serving cell,

Mr.5gscpci: a physical cell identity of the NR serving cell;

optionally, the following fields may be further extracted:

mr.5gscttadv: the signal propagation time from UE to the serving cell is a main index reflecting the distance between the UE and the serving cell

Mr.5gscaoa: the reference azimuth angle of the UE relative to the communication service cell should be north and counterclockwise.

It should be noted that, since the 5G UE uses the 4G EPC core network, the MME related information of the same UE is the same in the 4G MR data and the 5G MR data, that is, the mr.ltemmecode field and the mr.5gmmecode field in the 4G MR data and the 5G MR data that are reported by the same UE through measurement are the same, the mr.ltemmecoroupid field and the mr.5gmmegroupid field are the same, and the mr.ltemmeme esi1apid field and the mr.5gmmeess1apid field are the same. In addition, one UE is identified by mr.ltemmecode + mr.ltemmegroupid + mr.ltemmeues1apid or mr.5gmmecode + mr.5gmmegroupid + mr.5gmmeuess1apid. For convenience of description, in the embodiment of the present invention, mr.ltemmecode + mr.ltemmegroupid + mr.ltemmeues1apid or mr.5gmmecode + mr.5gmmegroupid + mr.5gmmeeues1apid is defined as one UE identity, and the same one in all three fields is the same UE. In addition, mr.ltesitid + mr.ltescearfcn + mr.ltescpci may identify an LTE cell and mr.5gsititid + mr.5gsceearfcn + mr.5gscpci may identify an NR cell. For convenience of description, in the embodiment of the present invention, mr. ltesitid + mr. ltescearfcn + mr. ltescpci is defined as an LTE cell identifier, and the same three fields are the same, i.e., the same LTE cell; and defining the MR.5Gsiteid + MR.5GScEarfcn + MR.5GScPci as an NR cell identifier, wherein the same three fields are the same, namely the same NR cell. Similarly, since which NR cell and LTE cell is a cell pair is network construction infrastructure data, a cell pair may be identified by a cell pair identifier, such as mr.ltesiteid + mr.ltescearfcn + mr.ltescpci, and mr.5gsitid + mr.5gsceearfcn + mr.5gscpci, in the MR data.

Step 102: adjusting a time point field in the extracted MR data, unifying the time granularity of the 4G MR data and the 5G MR data, and obtaining the time-adjusted MR data; in the time-adjusted 4G MR data and 5G MR data, one sampling data is respectively reserved for the same UE at the same time.

Because the reporting periods of the measurement sampling points in the 4GMR data and the 5G MR data are different, and the reporting time points are different, the time point fields in the MR data need to be unified according to a certain time granularity. This step is to adjust the time point fields (MR. ltetimestamp field, mr.5gtimestam field) in the MR data at a certain time granularity for subsequent time correlation. The method specifically comprises the following steps:

1. the time point fields in the MR data are unified in seconds with a minimum time granularity of seconds.

Specifically, the period k seconds is taken as the period, k > is 1 and can be divided by 60, one minute is divided into 60/k time intervals from 0, and the time point field of each sampling point in the MR data is adjusted to the uniform time point closest to the time point field. If k is 2, one minute is divided into 30 time intervals, and the data of the original time point field is adjusted to 2019-11-1908:00: 03.51 if the data is 2019-11-1908:00: 04.

2. In 4G MR data, only one sampling data is reserved for a plurality of sampling data of the same UE at the same time; in the 5G MR data, only one sample data is retained for a plurality of sample data of the same UE at the same time. In other words, except for the reserved sampling point data, other sampling data with the same fields of the MR.LteTimeStamp, the MR.LteMmeCode, the MR.LteMmeGroupID and the MR.LteMmeUeS1apId are removed from the 4G MR data, and other sampling data with the same fields of the MR.5GTimeStamp, the MR.5GMmeCode, the MR.5GMmeGroupID and the MR.5GMmeUeS1apId are removed from the 5G MR data, so that only 1 sampling data is respectively contained in the 4G or 5G MR data at the same time of the same UE.

Step 103: and respectively sequencing the 4G MR data and the 5G MR data according to the time sequence, and then sequencing according to the UE to obtain the 4G MR data and the 5G MR data after sequencing.

Specifically, the measurement sampling data in the 4G MR data is sorted according to the adjusted time sequence in the time point field mr.ltemetimestamp, and then sorted according to the UE identifier (i.e., mr.ltemeccode + mr.lteme group id + mr.lteme uese 1 apid); the measurement sampling data in the 5G MR data are firstly sorted according to the adjusted time sequence in the time point field MR.5GTimeStamp, and then sorted according to the UE identifier (namely, MR.5GMmecode + MR.5GMmeGroupID + MR.5GMmeUeS1apId).

Step 104: and performing data association on the sorted 4G MR data and the sorted 5G MR data according to the same time and the same UE to obtain the MR data of the evaluation network after the data association.

Specifically, for the sorted 4G MR data and 5G MR data, correlation is performed according to the same time (i.e., MR. ltetmestamp ═ mr.5gtimestam) and the same UE identity (i.e., MR. lttemmecode ═ mr.5gmmecode, MR. lttemmegroupidd ═ mr.5gmmegroupidd, and MR. lttemmeues1apid ═ mr.5gmmeues1apid), and the correlation mode is outijin (external correlation), so as to completely record the whole service process of the UE, that is, the case that 4G and 5G signals of all UEs in the evaluation network at all time points within a certain time range are all reflected in the MR data of the evaluation network after correlation, and the MR data can be used as analysis base data to comprehensively and accurately evaluate the handover synchronicity of all cell pairs. The MR data of the associated evaluation network is then entered into a database.

Preferably, step 100 may further comprise:

step 105: parameter information of all NR sites in the evaluation network is acquired in a predetermined period and input into a database.

Specifically, information such as transmission power information and handover parameters of each NR station in the evaluation network may be acquired at a specific time every day, for example, at 01:00am, and optionally, parameter information such as a massive mimo pattern (massive mimo template) of the NR station may be further acquired. The above parameter information is basic configuration information of the NR station.

In order to better evaluate the handover synchronization of the cell pair, optionally, the cell handover evaluation method of this embodiment further includes:

step 110 a: and detecting and evaluating the physical identical coverage of each NR cell and LTE cell pair in the network, and outputting an antenna feed system adjusting scheme to ensure that the cell pairs are physically identical in coverage.

The corresponding relation between the NR cell and the LTE cell and the work parameter information of each cell are known network construction basic data. And detecting the physical identical coverage of the cell pair by utilizing the parameter information according to the corresponding relation. The specific detection judgment is based on the industrial parameter information such as the distance of the cell pair, the antenna included angle, the mechanical declination angle difference and the like. The specific detection judgment process is as follows:

if the distance between two cells in a cell pair is > d, or the antenna included angle is > e, or the | mechanical downtilt difference | > f, it is considered that the corresponding relationship between the NR cell and the LTE cell in the cell pair is different in physical configuration, and physical coverage does not exist, and physical adjustment is required. Further, a physical antenna feeder system adjustment scheme aiming at the NR cell and/or the LTE cell by the cell is generated, so that the distance between the two cells in the cell pair is less than or equal to d, the antenna included angle is less than or equal to e, and the absolute mechanical declination angle difference is less than or equal to f, and the physical same coverage is met. The suggested value ranges of the parameters d, e and f are respectively as follows: d is more than or equal to 10m and less than or equal to 20m, e is more than or equal to 10 degrees and less than or equal to 15 degrees, f is more than or equal to 5 degrees and less than or equal to 10 degrees, and the adjustment can be respectively carried out according to the specific network conditions.

Step 110a is an optional step, if there is no physical co-coverage between the NR cell and the LTE cell in the cell pair, the cell handover evaluation method of this embodiment may also be performed, but if the above-mentioned cell pair has physical co-coverage, the evaluation of the handover synchronization of each cell pair in the evaluation network is more accurate, the adjustment space for the cell pair that does not achieve handover synchronization is larger, and the adjustment scheme is more optimized.

In order to more comprehensively and accurately analyze and evaluate the handover synchronicity of the cell pairs in the evaluation network, the MR data of the evaluation network after the data association should be MR data in a certain period. Because the MR data is extracted and processed within a predetermined time, such as 15 minutes, and the sample size has certain limitation, preferably, the system acquires the correlated evaluation network MR data for at least one day for analysis, so that enough MR sampling data is available as analysis basic data, and the handover synchronization evaluation of each cell pair in the evaluation network is more comprehensive and accurate, so as to accurately find all cell pairs which do not achieve handover synchronization.

Specifically, in step 110, the MR data of a certain UE in a certain time period is obtained from the MR data of the evaluation network after association as the analysis basic data, and since the MR data is sorted by time and UE identifier, the MR data includes information of the NR cell and the LTE cell that the UE is doubly connected to, and certainly, the NR cell and the LTE cell are a cell pair. Thus, the complete cell switching track of the UE in a certain time period can be found in time sequence.

Step 120: and identifying that the UE is switched to the first cell at the first switching time according to the time information and the first cell information in the MR data.

Specifically, the first cell is an NR cell, and the second cell is an LTE cell. Method of identifying NR cell handover in correlated MR data: for the same UE, two consecutive MR sampling point data are respectively different NR cells, and the time difference of the two sampling points is less than g seconds, preferably, g is less than or equal to 5. The first switching time (i.e., the NR cell switching time) is defined as the time midpoint of two sampling points. And if g is too large, namely two sampling points are separated by a longer time, judging that the NR cell is not changed due to switching.

Step 130: and identifying that the UE is switched to the second cell at the second switching time according to the time information and the second cell information in the MR data.

Specifically, the first cell is an NR cell, and the second cell is an LTE cell. The method for identifying LTE cell switching in the associated MR data comprises the following steps: for the same UE, two continuous MR sampling point data are different LTE cells respectively, and the time difference of the two sampling points is less than g seconds, preferably, g is less than or equal to 5. The second switching time (i.e., the LTE cell switching time) is defined as the time midpoint of the two sampling points. And if g is too large, namely two sampling points are separated for a long time, judging that the LTE cell change caused by switching is not the case.

Step 140: and if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that an asynchronous switching event occurs in the cell pair.

Specifically, in an NSA scenario, for a cell pair of an NR cell and an LTE cell, an MR measurement process from when a UE simultaneously connects the NR cell and the corresponding LTE cell to when 4G and 5G connections of the UE are respectively switched to other cells is defined as a handover event, which may be referred to as a handover event of the cell pair.

As described above, one cell pair in the correlated MR data can be distinguished by identifying such a cell pair as mr.ltesiteid + mr.ltescfcn + mr.ltescpci and mr.5gsitied + mr.5gscearfcn + mr.5gscpci.

Specifically, the handover events can be divided into asynchronous handover events and synchronous handover events: and if m is less than or equal to | the first switching time-the second switching time |, namely the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, the cell pair is considered to have an asynchronous switching event. Optionally, it may further limit that when m is less than or equal to | the first handover time-the second handover time | < n, the handover event is one asynchronous handover event of the cell pair, that is, an abnormal condition that the absolute value of the difference between some handover times is greater than or equal to n is excluded. The event in this category continuously experiences 2 rate dips in n times from the perspective of user perception.

Correspondingly, if the absolute value of the difference between the first switching time and the second switching time is less than m, namely the absolute value of the difference between the first switching time and the second switching time is less than a preset value, the cell pair is considered to have a synchronous switching event.

The values of m and n can be flexibly set according to actual conditions, and in a preferred embodiment of the present embodiment, m is 3 seconds, and n is 20 seconds.

Specifically, step 140 includes two asynchronous handover events:

1. first out-of-sync handover event: the first switching time is greater than the second switching time, that is, the switching time of the LTE cell is earlier and the switching time of the NR cell is later;

2. a second out-of-sync handover event: the second handover time is greater than the first handover time, that is, the NR cell handover time is earlier and the LTE cell handover time is later.

The embodiment of the invention evaluates each cell switching condition by utilizing MR data of an evaluation network, wherein the MR data comprises a large amount of data such as cell switching related time information and cell information before and after switching reported by user terminal measurement, and the data is analyzed and compared, so that the occurrence of all cell switching conditions can be detected more comprehensively and accurately, and further, the asynchronous switching event of a cell can be accurately judged by comparing the switching time of two cells connected by double-connection user terminals, thereby comprehensively and accurately finding out the asynchronous switching problem of a first cell (NR cell) and a second cell (LTE cell) corresponding to the first cell in the evaluation network.

After the problem of asynchronous switching of the cell pair is found, the adjustment scheme needs to be output for the asynchronous switching cell pair. In the prior art, the establishment of adjustment measures is determined by subjective judgment of operators, the quality of the adjustment measures depends on the business experience of the operators to a great extent, and the adjustment efficiency is low. After the asynchronous switching problem of the cell pair is found, the adjusting level can be calculated according to the cell signal strength information contained in the MR data, namely the data of the MR.LtescRSRP and/or the MR.5GScRSRP fields, and the power of the NR cell in the cell pair is adjusted, so that the synchronous switching of the NR cell and the corresponding LTE cell is maximized.

Preferably, the cell handover evaluation method in the embodiment of the present invention further includes a step of adjusting the transmission power of an NR cell in the cell pair, which is specifically as follows:

due to the difference between the frequency bands of the 5G NR cell and the 4G LTE cell, the bandwidth of the carrier, and other factors, the overall signal strength levels of the two cells are different. In general, NR cells are typically lower in signal strength than LTE cells. On the other hand, since coverage technologies of antennas of 5G NR and LTE are also significantly different, signal strengths of cell coverage edges at the time of handover are different, and synchronization of cell handover cannot be easily achieved by matching the coverage signal strengths of the two. In order to maximize the ratio of synchronous handover between the NR cell and the LTE cell, the coverage edge of the NR cell and the coverage edge of the LTE cell need to be better matched.

As described above, there may be two cases for the asynchronous handover event of a cell pair, and correspondingly, the calculation of the adjustment level in this embodiment is described according to the first asynchronous handover event and the second asynchronous handover event:

1. first out of sync handover event condition

In this case, the LTE cell switching time in the cell pair to which the UE is connected is before, and the NR cell switching time is after, that is, the difference between the first switching time and the second switching time is greater than or equal to the preset value.

Accordingly, step 140 includes:

step 141: and if the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that a first asynchronous switching event occurs in the cell pair.

Assume that the first asynchronous handover event of this time is the ith first asynchronous handover event of the cell pair.

After the asynchronous handover of the cell pair is judged, the cell handover evaluation method further comprises the following steps:

step 150: and averaging the signal intensity of r NR cells in preset number before the second switching time to obtain a first actual level.

The associated MR data includes signal strength information of the NR cell to which the UE is connected, that is, a sampling value of an mr.5 gscrrp field in the MR data. Specifically, a first actual level i is calculated according to NR cell signal strength data in an mr.5 gscrrp field in the associated MR data, where the first actual level i is Mean (r mr.5 gscrrp fields before the second switching time), that is, the values of the mr.5 gscrrp field in r pieces of sampling data before the LTE cell switching time are averaged to obtain a first actual level i, and the preset parameter r can be flexibly valued according to the situation.

Step 160: and averaging the signal intensity of r NR cells in a preset number before the first switching time to obtain a first target level.

Specifically, a first target level i is calculated according to NR cell signal strength data in an mr.5 gscrrp field in the associated MR data, where the first target level i is Mean (r mr.5 gscrrp before the first switching time), that is, the value of the mr.5 gscrrp field in r pieces of sample data before the NR cell switching time is averaged to obtain a first target level i, and the preset parameter r may be flexibly valued according to the situation, and may be the same as or different from the value in calculating the first actual level.

Step 170: the first adjustment level is calculated as the first target level minus the first actual level.

Let X_iA first adjustment level for the first out-of-sync handover event of the current time for the cell is then determined

X_iFirst target level i-first actual level i;

the principle of the first adjustment level calculation is that the signal strength of the NR cell connected to the UE at the LTE cell switching time is the first actual level, and the NR connection switching is not triggered, and if the signal strength is the first target level at the time point, the NR cell switching is triggered, so that the synchronous switching of the cell pair is realized.

As shown in table 1 below, an example of a first out-of-sync handover event is shown.

TABLE 1

According to the basic data of the correspondence between the NR cell and the LTE cell, it is assumed that NRCELL1 and Anchorcell1 are a cell pair, and NRCELL2 and Anchorcell2 are a cell pair.

The user terminal Phone1 has carried out LTE cell switching from 2019-11-1908:00: 12 to 2019-11-1908:00: 16, and the second switching time takes the time midpoint of two sampling points as 2019-11-1908:00: 14; and NR cell switching occurs between 2019-11-1908:00: 22 to 2019-11-1908:00: 26, the first switching time takes the midpoint of two sampling points as 2019-11-1908:00:24, and the difference between the first switching time and the second switching time is 10 seconds.

Assuming that m is 3 seconds, n is 20 seconds, m is not more than the first handover time, the second handover time is less than n, the current NR cell and LTE cell of Phone1 are switched to the first asynchronous handover event of the NRCELL1 and Anchorcell1 cell pair.

Assuming that r is 2, the first actual level should use the NR level of the two sampling points 2019-11-1908:00: 10 and 2019-11-1908:00: 12 before the second switching time 2019-11-1908:00: 14, and the first actual level is (43+43)/2 is 43; the first target level should use the NR level of two sampling points 2019-11-1908:00: 20 and 2019-11-1908:00: 22 before the first switching time 2019-11-1908:00:24, and the first target level is (39+39)/2 is 39; a first adjustment level is calculated-a first target level-a first actual level-39-43-4.

It should be noted that, for simplification of the table, table 1 is not shown according to the actual table field of the correlated MR sampling data. The UE identification field actually corresponds to an mr.ltemmeconode + mr.ltemmecongroupid + mr.ltemmueset1apid field or an mr.5gmmecode + mr.5gmmeggroupid + mr.5gmmeueset1apid field, the NR time field actually corresponds to an mr.5gtimestomp field, the NR cell field actually corresponds to an mr.5gsitieid + mr.5gsceasfcn + mr.5gscpci field, the NR level field actually corresponds to an mr.5gscsrsrp field, the LTE time field actually corresponds to a.lttesestamp field, the LTE cell field actually corresponds to an mr.lttesisteid + mr.lttesserfcn + mr.lttespci field, and the LTE level field actually corresponds to an mr.lttesrpp field.

2. Second out-of-sync handover event condition

In this case, the switching time of the NR cell in the cell pair to which the UE is connected is before, and the switching time of the LTE cell is after, that is, the difference between the second switching time and the first switching time is greater than or equal to the preset value.

Accordingly, step 140 includes:

step 142: and if the difference between the second switching time and the first switching time is greater than or equal to a preset value, judging that a second asynchronous switching event occurs in the cell pair.

Assume that this second asynchronous handover event is a jth second asynchronous handover event of the cell pair.

After the asynchronous handover of the cell pair is judged, the cell handover evaluation method further comprises the following steps:

step 180: and averaging the signal intensity of the LTE cells with the preset number r before the first switching time to obtain a second actual level.

The associated MR data includes signal strength information of the LTE cell to which the UE is connected, that is, a sampling value of an MR. Specifically, the second actual level j is calculated according to LTE cell signal strength data in the mr.ltescrsrp field in the associated MR data, where the second actual level j is Mean (r mr.ltescrsrp fields before the first switching time), that is, the value of the mr.ltescrsrp field in r sample data before the NR cell switching time is averaged to obtain the second actual level j, and the preset parameter r may be flexibly valued according to the situation, and may be the same as or different from the value in the first asynchronous switching event situation.

Step 190: and averaging the signal intensity of the LTE cells with the preset number r before the second switching time to obtain a second target level.

Specifically, a second target level j is calculated according to LTE cell signal strength data in an mr.ltescrsrp field in the associated MR data, where the second target level j is Mean (r mr.ltescrsrp fields before the second switching time), that is, the value of the mr.ltescrsrp field in r pieces of sample data before the LTE cell switching time is averaged to obtain the second target level j, and the preset parameter r may be flexibly valued according to the situation, and may be the same as or different from the value in calculating the second actual level.

Step 1100: the second adjustment level is calculated as the second actual level minus the second target level.

Is provided with Y_jA second adjustment level for the cell for the second asynchronous handover event of this time is then determined

Y_jSecond actual level j — second target level j;

the principle of the second adjustment level calculation is that the LTE cell signal strength connected to the UE at the NR cell switching time is the second actual level, and the LTE connection switching is not triggered, and if the LTE cell signal strength is the second target level at the time point, the LTE cell switching is triggered, so that the synchronous switching of the cell pair is realized. Since the adjustment of the levels is done on the NR cell, which has the opposite direction of the adjustment of the coverage of the LTE cell, this is the second actual level minus the second target level.

As shown in table 2 below, an example of a second out-of-sync handover event is shown.

TABLE 2

According to the basic data of the correspondence between the NR cell and the LTE cell, it is assumed that NRCELL1 and Anchorcell1 are a cell pair, and NRCELL3 and Anchorcell3 are a cell pair.

The user terminal Phone2 has performed NR cell switching from 2019-11-1908:00: 12 to 2019-11-1908:00: 16, and the first switching time takes the time midpoint of two sampling points as 2019-11-1908:00: 14; and the LTE cell switching occurs between 2019-11-1908:00: 22 and 2019-11-1908:00: 26, the second switching time takes the middle point of two sampling points as 2019-11-1908:00:24, and the difference between the second switching time and the first switching time is 10 seconds.

Assuming that m is 3 seconds, n is 20 seconds, m is not more than the second handover time — the first handover time is less than n, the current NR cell and LTE cell of Phone2 are handed over to a second unsynchronized handover event of the NRCELL1 and Anchorcell1 cell pair.

Assuming that r is 2, the second actual level should use the LTE level of the first two sampling points 2019-11-1908:00: 10 and 2019-11-1908:00: 12 before the first switching time 2019-11-1908:00: 14, and the second actual level is (52+52)/2 is 52; the second target level should use the LTE level of two sampling points 2019-11-1908:00: 20 and 2019-11-1908:00: 22 before the second switching time 2019-11-1908:00:24, where the second target level is (46+46)/2 is 46; a second adjustment level, second actual level, second target level 52-46, 6 is calculated.

Similarly, the fields in table 2 are also simplified fields, and the correspondence with the actual fields is the same as table 1, which is not described herein again.

Optionally, in order to accurately record the situations of asynchronous handover events and synchronous handover events of a cell pair, a cell handover event statistical table may be maintained, where a sample table is shown in table 3 below:

TABLE 3

After the system judges the switching condition of the UE in one cell pair every time, the system records a piece of switching event data related to the cell pair in the switching event statistical table. As shown in the example of table 1, after the adjustment level is calculated, the first out-of-sync handover event of the cell pair NRCELL1 and ancorcell 1 is recorded in the handover event statistics table once, and the adjustment level is recorded as-4. Also for the example shown in table 2, after the adjustment level is calculated, a second out-of-sync handover event of the cell pair NRCELL1 and ancorcell 1 is recorded in the handover event statistics table and the adjustment level is recorded as 6.

After the adjustment level of each asynchronous switching event in the correlated evaluation network MR data is calculated and recorded in the statistical table, the required adjustment level of the transmission power of an NR cell of a certain cell can be calculated.

Preferably, the method for cell handover evaluation after calculating the adjustment level of this embodiment further includes the following steps:

step 1110: if the absolute value of the difference between the first switching time and the second switching time is smaller than a preset value, judging that a synchronous switching event occurs in the cell pair; and counting the number s of the synchronous switching events of the cell pairs in the MR data of the evaluation network.

Specifically, as described above, if | the first handover time-the second handover time | < m, the system determines that a synchronous handover event occurs in the pair of cells, and records the synchronous handover event in the handover event statistical table. A synchronous handover event is recorded for the NRCELL1 and Anchorcell1 cell pair as in line 5 of the above statistical table.

Correspondingly, the number s of handover synchronization events of the cell pair can be counted in the handover event counting table for the cell pair.

Step 1120: calculating a demand adjustment level μ for the NR cell of the pair of cells as:

argmin(∑(X_i-μ)²+∑(Y_j-μ)²+s*μ²)；

the [ mu ] belongs to an integer; said X_iA first adjustment level for an ith first out-of-sync handover event of the cell pair in the MR data of the evaluation network; said Y is_jA second adjustment level for a jth second out-of-sync handover event of the cell pair in the MR data of the evaluation network.

Specifically, by looking up the record of the first asynchronous handover event of the cell pair in the handover event statistical table, the first adjustment level of all the first asynchronous handover events of the cell pair can be obtained, for example, for the cell pair of NRCELL1 and ancorcell 1, the X1 is-4, the X2 is-5, and the X3 is-3. Similarly, the second adjustment level for all second out-of-synch handover events for the cell pair may be obtained by looking up a record of the second out-of-synch handover events for the cell pair in a statistical table, e.g., for the NRCELL1 and anchocell 1 cell pair, Y1 may be 6 and Y2 may be 3.

The calculation of the demand adjustment level μ is exemplified as follows:

according to the formula argmin (∑ (X)_i-μ)²+∑(Y_j-μ)²+s*μ²) And (5) carrying out derivation to obtain a formula: -2 ∑ (X)_i-μ)-2∑(Y_j- μ) +2s ═ 0. Assuming that there are 5 first out-of-sync handover events for the cell pair, the first adjustment level X is set for each time_iRespectively-5, -4, -3, -2, -1; the second asynchronous switching event has 3 times, each time the second adjustment level Y_jRespectively 3, 2 and 1; there are 2 simultaneous handover events for this cell pair, i.e. s equals 2. Substituting the data into the formula to obtain: 10 μ +30+6 μ -12+4 ═ 0, i.e. 16 μ ═ -22, then μ ═ -1.2, and after rounding μ ═ -1. The calculations show that overall coverage of the NR cell is slightly greater from the handover event for that cell pair as a whole, and therefore the transmit power needs to be adjusted by 1 dB.

After calculating the adjustment level μ required by the NR cell in the pair of cells, an adjustment strategy for the synchronized handover of the pair of cells may be generated. Preferably, the cell handover evaluation method of this embodiment further includes the following steps:

step 1130: acquiring the current transmitting power B of the NR cell;

if B + μ e [ P ]_c，Q_c]Adjusting the occurrence power of the NR cell from B to B + mu; said [ P ]_c，Q_c]Is a transmit power range of the NR cell; the P is_cIs the minimum value of the NR cell transmit power, the Q_cIs the maximum value of the NR cell transmit power. The c represents the c-th cell pair in the evaluation network, which needs to be adjusted in transmission power.

LaunchingPower B, P_cAnd Q_cMay be obtained from the parameter information of each NR station acquired in step 105.

Step 1140: if B + mu>Q_cAdjusting the NR cell generation power from B to Q_c；

Optionally, the redundant level adjustment requirement can be compensated by adjusting the switching hysteresis HYST. However, the switching hysteresis HYST cannot be set too large, and too large excessively delays switching, so that signal quality is reduced, and user perception is affected. There is therefore a switching hysteresis maximum threshold HYST_max. Optionally, the step may further include adjusting the NR cell switching hysteresis:

comparing the NR cell original handover hysteresis HYST_oldHysteresis maximum threshold HYST for handover with the NR cell_maxSize of (e), if HYST_old<HYST_maxSetting the NR cell handover hysteresis HYST to Min (HYST)_old+(B+μ-Q_c)，HYST_max) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

Step 1150: if B + mu<P_cAdjusting the NR cell generation power from B to P_c；

Optionally, the redundant level adjustment requirement can be compensated by adjusting the switching hysteresis HYST. The switching hysteresis HYST cannot be set too low, which may cause ping-pong switching and cause unreasonable increase of switching times. There is therefore a handover hysteresis minimum threshold HYST_min. Optionally, the step may further include adjusting the NR cell switching hysteresis:

comparing the NR cell original handover hysteresis HYST_oldHysteresis minimum threshold HYST for handover with the NR cell_minSize of (e), if HYST_old>HYST_minSetting the NR cell switching hysteresis HYST to Max (HYST)_old-(P_c-B-μ)，HYST_min) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

Through the above steps, NR cells in all cell pairs that need to be subjected to transmit power adjustment in the evaluation network may be adjusted to generate an adjustment policy, and specifically, the cell switching evaluation apparatus/device may be connected to a 5G OMC (Operation and Maintenance Center) system, and execute a corresponding adjustment policy.

By the cell switching evaluation method, after the asynchronous switching problem of the cell pair is found, the adjustment level of the cell pair for each asynchronous switching event is calculated according to the cell signal strength information contained in the MR data, the adjustment level of the cell pair for a plurality of asynchronous switching events and the synchronous switching times are integrated, the required adjustment level of the cell pair on the whole can be calculated, the transmitting power of the NR cell in the cell pair is adjusted, and an adjustment strategy is generated, so that the coverage ranges of the NR cell and the LTE cell in the cell pair are consistent as much as possible, and the synchronous switching of the NR cell and the corresponding LTE cell is maximized. When the transmission power of the NR cell is specifically adjusted, if the adjusted transmission power exceeds the power range of the NR cell, the transmission power of the NR cell may be set to the maximum power value or the minimum power value, and the switching delay of the NR cell may be further finely adjusted, so that the adjustment of the transmission power of the NR cell is more refined, and the coverage areas of the NR cell and the LTE cell in the cell pair are matched as much as possible. Compared with the existing mode of outputting an adjusting scheme according to experience by an operator, the method has the advantages that the adjustment of the cell to the transmitting power is more comprehensive, objective, accurate and efficient according to a large amount of data, and the adjusted cell has better switching synchronism.

In summary, in the embodiments of the present invention, the MR data of the evaluation network is used to evaluate each cell handover situation, and the MR data includes a large amount of data of cell handover-related time information, cell information before and after handover, and the like, which are reported by the ue measurement, so that the ues become "test terminals," thereby greatly reducing the cost of acquiring analysis data. Through analyzing and comparing the data, the occurrence of the switching situation of all cells can be detected more comprehensively and accurately, and then the switching time of two cells connected by comparing double-connection user terminals can be accurately judged out the switching event of the cells to the asynchronization, thereby comprehensively and accurately finding out the asynchronization switching problem of the 5G NR cells and the corresponding LTE cells in the evaluation network.

Fig. 2 is a schematic structural diagram of an embodiment of the cell handover evaluation apparatus of the present invention. As shown in fig. 2, the apparatus 200 includes:

an obtaining module 210, configured to obtain MR data of the UE from the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

a first identifying module 220, configured to identify that the UE performs a first cell handover at a first handover time according to the time information and the first cell information in the MR data;

a second identifying module 230, configured to identify, according to the time information and the second cell information in the MR data, that the UE has performed a second cell handover at a second handover time;

the determining module 240 is configured to determine that an asynchronous handover event occurs to the cell pair when an absolute value of a difference between the first handover time and the second handover time is greater than or equal to a preset value.

Specifically, the first cell is an NR cell, and the second cell is an LTE cell.

Preferably, the cell handover evaluating apparatus 200 according to the embodiment of the present invention further includes:

the MR data association module 250 is configured to acquire MR data of all stations in the evaluation network, extract evaluation-related fields, obtain the extracted first MR data and second MR data, and adjust and associate the first MR data and the second MR data to obtain MR data of the evaluation network after data association.

The first MR data is 5G MR data, and the second MR data is 4G MR data.

Specifically, the MR data association module 250 includes:

the MR data extracting unit 251 is configured to acquire MR data of all LTE sites and NR sites in the evaluation network in a predetermined period, and extract evaluation-related fields to obtain extracted MR data, where the extracted MR data includes 4G MR data and 5G MR data;

a time adjusting unit 252, configured to adjust a time point field in the extracted MR data, unify time granularities of the 4G MR data and the 5G MR data, and obtain time-adjusted MR data; respectively keeping one sampling data for the same UE at the same time in the time-adjusted 4G MR data and 5G MR data;

the sorting unit 253 is configured to sort the 4G MR data and the 5G MR data according to a time sequence, and then sort the 4G MR data and the 5G MR data according to the UE, so as to obtain sorted 4G MR data and sorted 5G MR data;

and a data association unit 254, configured to perform data association on the sorted 4G MR data and the sorted 5G MR data according to the same time and the same UE, so as to obtain MR data of the evaluation network after data association.

The MR data of the evaluation network after the association completely records the whole service process of the UE, that is, the conditions of 4G and 5G signals of all UEs in the evaluation network at all time points within a certain time range are reflected in the MR data of the evaluation network after the association. The handover synchronicity of all cell pairs can be comprehensively, objectively and accurately evaluated by using the cell pairs as analysis basic data.

Preferably, the MR data association module 250 may further include:

a parameter information obtaining unit 255 configured to obtain parameter information of all NR stations in the evaluation network in a predetermined period;

a database unit 256, configured to store the associated MR data of the evaluation network and parameter information of the NR station.

Optionally, the cell handover evaluating apparatus 200 further includes:

and the detecting module 260 is configured to detect and evaluate physical coverage of each NR cell and LTE cell pair in the network, and output an antenna feeder system adjustment scheme.

Preferably, the judging module 240 includes:

a first determining unit 241, configured to determine that a first asynchronous handover event occurs to the cell pair when a difference between the first handover time and the second handover time is greater than or equal to a preset value;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the NR cell;

the apparatus 200 further comprises:

a first actual level calculation module 270, configured to average signal strengths of r NR cells, which are preset number before the second switching time, to obtain a first actual level;

a first target level calculation module 280, configured to average signal strengths of r NR cells that are preset before the first handover time to obtain a first target level;

the first adjustment level calculation module 290 is configured to calculate the first adjustment level as the first target level minus the first actual level.

Preferably, the judging module 240 includes:

a second determining unit 242, configured to determine that a second asynchronous handover event occurs to the cell pair when a difference between the second handover time and the first handover time is greater than or equal to a preset value;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the LTE cell;

the apparatus 200 further comprises:

a second actual level calculation module 2100, configured to average signal strengths of r LTE cells, which are preset number before the first handover time, to obtain a second actual level;

a second target level calculation module 2110, configured to average signal strengths of r LTE cells, which are preset number before the second switching time, to obtain a second target level;

and a second adjustment level calculating module 2120, configured to calculate a second adjustment level as a second actual level minus a second target level.

Preferably, the determining module 240 further includes:

a third determining unit 243, configured to determine that a synchronous handover event occurs in the cell pair when an absolute value of a difference between the first handover time and the second handover time is smaller than a preset value;

the apparatus 200 further comprises:

a counting module 2130, configured to count a number s of synchronous handover events of the cell pair in the MR data of the evaluation network;

a demand level calculating module 2140, configured to calculate a demand adjustment level μ of the NR cell in the cell pair as:

argmin(∑(X_i-μ)²+∑(Y_j-μ)²+s*μ²)；

the [ mu ] belongs to an integer; said X_iA first adjustment level for an ith first out-of-sync handover event of the cell pair in the MR data of the evaluation network; said Y is_jA second adjustment level for a jth second out-of-sync handover event of the cell pair in the MR data of the evaluation network.

Preferably, the apparatus 200 further comprises:

a transmission power obtaining module 2150, configured to obtain the current transmission power B of the NR cell;

a first adjusting module 2160 for adjusting if B + μ e [ P ∈_c，Q_c]Adjusting the occurrence power of the NR cell from B to B + mu;

said [ P ]_c，Q_c]Is a transmit power range of the NR cell; the P is_cIs the minimum value of the NR cell transmit power, the Q_cIs the maximum value of the NR cell transmit power; c represents the c-th cell pair which needs to be adjusted in the evaluation network;

optionally, the apparatus 200 further comprises: a second adjusting module 2170 for if B + mu>Q_cAdjusting the NR cell generation power from B to Q_c；

Optionally, the second adjusting module 2170 further includes: first switching hysteresis setting sheetElement 2171 for comparing the NR cell original handover hysteresis HYST_oldHysteresis maximum threshold HYST for handover with the NR cell_maxSize of (e), if HYST_old<HYST_maxSetting the NR cell handover hysteresis HYST to Min (HYST)_old+(B+μ-Q_c)，HYST_max) Otherwise, not adjusting the NR cell handover hysteresis HYST;

optionally, the apparatus 200 further comprises: a third adjusting module 2180 for adjusting the phase difference of B + mu<P_cAdjusting the NR cell generation power from B to P_c；

Optionally, the third adjusting module 2180 further includes: a second handover hysteresis setting unit 2181, configured to compare the NR cell original handover hysteresis HYST_oldHysteresis minimum threshold HYST for handover with the NR cell_minSize of (e), if HYST_old>HYST_minSetting the NR cell switching hysteresis HYST to Max (HYST)_old-(P_c-B-μ)，HYST_min) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

In summary, the cell handover evaluation device in the embodiment of the present invention evaluates each cell handover situation by using MR data of an evaluation network, where the MR data includes a large amount of data of cell handover-related time information of a measurement report of a user terminal, cell information before and after handover, and the like, so that the user terminals become "test terminals," thereby greatly reducing the cost of acquiring analysis data. Through analyzing and comparing the data, the occurrence of the switching situation of all cells can be detected more comprehensively and accurately, and then the switching time of two cells connected by comparing double-connection user terminals can be accurately judged out the switching event of the cells to the asynchronization, thereby comprehensively and accurately finding out the asynchronization switching problem of 5G NR cells and corresponding LTE cells in the evaluation network.

Further, by the cell handover evaluation device of this embodiment, after the asynchronous handover problem of the cell pair is found, the adjustment level of the cell pair for each asynchronous handover event is calculated according to the cell signal strength information included in the MR data, the adjustment level of the multiple asynchronous handover events and the number of synchronous handovers of the cell pair are integrated, the required adjustment level of the cell pair as a whole can be calculated, the transmission power of the NR cell in the cell pair is adjusted, and an adjustment strategy is generated, so that the coverage ranges of the NR cell and the LTE cell in the cell pair are as consistent as possible, thereby maximizing the synchronous handover of the NR cell and the corresponding LTE cell. When the transmission power of the NR cell is specifically adjusted, if the adjusted transmission power exceeds the power range of the NR cell, the transmission power of the NR cell may be set to the maximum power value or the minimum power value, and the switching delay of the NR cell may be further finely adjusted, so that the adjustment of the transmission power of the NR cell is more refined, and the coverage areas of the NR cell and the LTE cell in the cell pair are matched as much as possible. Compared with the existing mode of outputting an adjusting scheme according to experience by an operator, the method has the advantages that the adjustment of the cell to the transmitting power is more comprehensive, objective, accurate and efficient according to a large amount of data, and the adjusted cell has better switching synchronism.

Fig. 3 is a schematic structural diagram illustrating an embodiment of a cell handover evaluation device according to the present invention, and the specific embodiment of the present invention does not limit the specific implementation of the cell handover evaluation device.

As shown in fig. 3, the cell handover evaluating apparatus may include: a processor (processor)302, a communication Interface 304, a memory 306, and a communication bus 308.

Wherein: the processor 302, communication interface 304, and memory 306 communicate with each other via a communication bus 308. A communication interface 304 for communicating with network elements of other devices, such as clients or other servers. The processor 302 is configured to execute the program 310, and may specifically execute the relevant steps in the above-described cell handover evaluation method embodiment.

In particular, program 310 may include program code comprising computer-executable instructions.

The processor 302 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement an embodiment of the present invention. The one or more processors included in the cell switching evaluation device may be the same type of processor, such as one or more CPUs; or may be different types of processors such as one or more CPUs and one or more ASICs.

And a memory 306 for storing a program 310. Memory 306 may comprise high-speed RAM memory and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.

Specifically, the program 310 may be invoked by the processor 302 to cause the cell handover evaluation device to perform the following operations:

acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

identifying that the UE is switched to a first cell at a first switching time according to the time information and the first cell information in the MR data;

identifying that the UE is switched to the second cell at a second switching time according to the time information and the second cell information in the MR data;

and if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that an asynchronous switching event occurs in the cell pair.

Preferably, in the data-correlated MR data of the evaluation network, acquiring MR data of the UE includes:

acquiring MR data of all stations in the evaluation network, extracting evaluation related fields, respectively acquiring first MR data and second MR data after extraction, adjusting and associating the first MR data and the second MR data, and acquiring MR data of the evaluation network after data association.

Specifically, the first MR data is 5G MR data, and the second MR data is 4G MR data. The steps further include:

acquiring MR data of all LTE sites and NR sites in an evaluation network in a preset period, and extracting evaluation related fields to obtain extracted MR data, wherein the extracted MR data comprises 4G MR data and 5G MR data;

adjusting a time point field in the extracted MR data, unifying the time granularity of the 4G MR data and the 5G MR data, and obtaining the time-adjusted MR data; respectively keeping one sampling data for the same UE at the same time in the time-adjusted 4G MR data and 5G MR data;

sequencing 4G MR data and 5G MR data according to a time sequence, and then sequencing according to UE to obtain sequenced 4G MR data and sequenced 5G MR data;

and performing data association on the sorted 4G MR data and the sorted 5G MR data according to the same time and the same UE to obtain the MR data of the evaluation network after the data association.

The MR data of the associated evaluation network completely records the whole service process of the UE, that is, the conditions of 4G and 5G signals of all UEs in the evaluation network at all time points within a certain time range are all reflected in the MR data of the associated evaluation network, and the MR data is used as analysis basic data to comprehensively, objectively and accurately evaluate the handover synchronization of all cell pairs. The MR data of the associated evaluation network is then entered into a database.

Optionally, the step of acquiring MR data may further include: parameter information of all NR sites in the evaluation network is acquired in a predetermined period and input into a database.

In a preferred embodiment, the communication interface 304 may interface with a server storing MR data to obtain MR data of all stations in the evaluation network, extract evaluation-related fields through the processor 702, respectively obtain extracted first MR data and second MR data, and adjust and associate the first MR data and the second MR data to obtain MR data of the evaluation network after data association. The database is stored in memory 306.

Optionally, the cell handover evaluation method further includes:

and detecting and evaluating the physical identical coverage of each NR cell and LTE cell pair in the network, and outputting an antenna feed system adjusting scheme to ensure that the cell pairs are physically identical in coverage.

In an optional manner, if an absolute value of a difference between the first handover time and the second handover time is greater than or equal to a preset value, the determining that an asynchronous handover event occurs in the cell pair includes:

if the difference between the first switching time and the second switching time is larger than or equal to a preset value, judging that a first asynchronous switching event occurs to the cell pair;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the NR cell; the cell switching evaluation method further comprises the following steps:

averaging the signal intensity of r NR cells in a preset number before the second switching time to obtain a first actual level;

averaging the signal intensity of r NR cells in a preset number before the first switching time to obtain a first target level;

the first adjustment level is calculated as the first target level minus the first actual level.

In an optional manner, if an absolute value of a difference between the first handover time and the second handover time is greater than or equal to a preset value, the determining that an asynchronous handover event occurs in the cell pair includes:

if the difference between the second switching time and the first switching time is larger than or equal to a preset value, judging that a second asynchronous switching event occurs to the cell pair;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the LTE cell; the cell switching evaluation method further comprises the following steps:

averaging the signal intensity of the LTE cells with the preset number r before the first switching time to obtain a second actual level;

averaging the signal intensity of a preset number r of LTE cells before the second switching time to obtain a second target level;

the second adjustment level is calculated as the second actual level minus the second target level.

In an optional manner, the cell handover evaluation method further includes:

if the absolute value of the difference between the first switching time and the second switching time is smaller than a preset value, judging that a synchronous switching event occurs in the cell pair;

counting the number s of synchronous switching events of the cell pairs in the MR data of the evaluation network;

calculating a demand adjustment level μ for the NR cell of the pair of cells as:

argmin(∑(X_i-μ)²+∑(Y_j-μ)²+s*μ²)；

the [ mu ] belongs to an integer; said X_iA first adjustment level for an ith first out-of-sync handover event of the cell pair in the MR data of the evaluation network; said Y is_jA second adjustment level for a jth second out-of-sync handover event of the cell pair in the MR data of the evaluation network.

In an optional manner, the calculating the demand adjustment level μ of the NR cell in the cell pair further includes:

acquiring the current transmitting power B of the NR cell;

if B + μ e [ P ]_c，Q_c]Adjusting the occurrence power of the NR cell from B to B + mu; said [ P ]_c，Q_c]Is a transmit power range of the NR cell; the P is_cIs the minimum value of the NR cell transmit power, the Q_cIs the maximum value of the NR cell transmit power.

In an optional manner, the cell handover evaluation method further includes:

if B + mu>Q_cAdjusting the NR cell generation power from B to Q_c；

Optionally, the method may further include adjusting the NR cell switching hysteresis:comparing the NR cell original handover hysteresis HYST_oldHysteresis maximum threshold HYST for handover with the NR cell_maxSize of (e), if HYST_old<HYST_maxSetting the NR cell handover hysteresis HYST to Min (HYST)_old+(B+μ-Q_c)，HYST_max) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

In an optional manner, the cell handover evaluation method further includes:

if B + mu<P_cAdjusting the NR cell generation power from B to P_c；

Optionally, the method may further include adjusting the NR cell switching hysteresis: comparing the NR cell original handover hysteresis HYST_oldHysteresis minimum threshold HYST for handover with the NR cell_minSize of (e), if HYST_old>HYST_minSetting the NR cell switching hysteresis HYST to Max (HYST)_old-(P_c-B-μ)，HYST_min) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

In summary, the cell handover evaluation device in the embodiment of the present invention evaluates the cell handover situation of each time by using the MR data of the evaluation network, where the MR data includes a large amount of data of the cell handover-related time information of the measurement report of the user terminal, the cell information before and after handover, and the like, so that the user terminals become "test terminals," thereby greatly reducing the cost of obtaining the analysis data. Through analyzing and comparing the data, the occurrence of the switching situation of all cells can be detected more comprehensively and accurately, and then the switching time of two cells connected by a dual-connection user terminal is compared, the switching event of the cells to the asynchronization can be accurately judged, so that the asynchronization switching problem of the 5G NR cells and the corresponding LTE cells in the evaluation network can be comprehensively and accurately found, in addition, the scheme is automatically evaluated by cell switching evaluation equipment, the investment of manpower, material resources and financial resources is greatly reduced, the expenditure cost is saved, and the evaluation efficiency is improved.

Further, through the cell handover evaluation device of this embodiment, after the asynchronous handover problem of the cell pair is found, the adjustment level of the cell pair for each asynchronous handover event is calculated according to the cell signal strength information included in the MR data, the adjustment level of the multiple asynchronous handover events and the number of synchronous handovers of the cell pair are integrated, the required adjustment level of the cell pair as a whole can be calculated, the transmission power of the NR cell in the cell pair is adjusted, and an adjustment strategy is generated, so that the coverage ranges of the NR cell and the LTE cell in the cell pair are as consistent as possible, thereby maximizing the synchronous handover of the NR cell and the corresponding LTE cell. When the transmission power of the NR cell is specifically adjusted, if the adjusted transmission power exceeds the power range of the NR cell, the transmission power of the NR cell may be set to the maximum power value or the minimum power value, and the switching delay of the NR cell may be further finely adjusted, so that the adjustment of the transmission power of the NR cell is more refined, and the coverage areas of the NR cell and the LTE cell in the cell pair are matched as much as possible. Compared with the existing mode of outputting an adjusting scheme according to experience by an operator, the method has the advantages that the adjustment of the cell to the transmitting power is more comprehensive, objective, accurate and efficient according to a large amount of data, and the adjusted cell has better switching synchronism.

An embodiment of the present invention provides a computer-readable storage medium, where the storage medium stores at least one executable instruction, and when the executable instruction is executed on a cell handover evaluation device/apparatus, the cell handover evaluation device/apparatus is caused to execute a cell handover evaluation method in any method embodiment described above.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specified otherwise.

Claims (10)

1. A method for evaluating cell handover, the method comprising:

acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

identifying that the UE is switched to a first cell at a first switching time according to the time information and the first cell information in the MR data;

identifying that the UE is switched to the second cell at a second switching time according to the time information and the second cell information in the MR data;

and if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, judging that an asynchronous switching event occurs in the cell pair.

2. The method of claim 1,

if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, the step of judging that an asynchronous switching event occurs in the cell pair comprises the following steps:

if the difference between the first switching time and the second switching time is larger than or equal to a preset value, judging that a first asynchronous switching event occurs to the cell pair;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the NR cell; the method further comprises the following steps:

averaging the signal intensity of r NR cells in a preset number before the second switching time to obtain a first actual level;

averaging the signal intensity of r NR cells in a preset number before the first switching time to obtain a first target level;

the first adjustment level is calculated as the first target level minus the first actual level.

3. The method according to claim 1 or 2,

if the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value, the step of judging that an asynchronous switching event occurs in the cell pair comprises the following steps:

if the difference between the second switching time and the first switching time is larger than or equal to a preset value, judging that a second asynchronous switching event occurs to the cell pair;

the first cell is an NR cell, and the second cell is an LTE cell; the MR data comprises the signal intensity information of the LTE cell; the method further comprises the following steps:

averaging the signal intensity of the LTE cells with the preset number r before the first switching time to obtain a second actual level;

averaging the signal intensity of a preset number r of LTE cells before the second switching time to obtain a second target level;

the second adjustment level is calculated as the second actual level minus the second target level.

4. The method of claim 3, further comprising:

if the absolute value of the difference between the first switching time and the second switching time is smaller than a preset value, judging that a synchronous switching event occurs in the cell pair;

counting the number s of synchronous switching events of the cell pairs in the MR data of the evaluation network;

calculating a demand adjustment level μ for the NR cell of the pair of cells as:

argmin(∑(X_i-μ)²+∑(Y_j-μ)²+s*μ²)；

the [ mu ] belongs to an integer; said X_iA first adjustment level for an ith first out-of-sync handover event of the cell pair in the MR data of the evaluation network; said Y is_jA second adjustment level for a jth second out-of-sync handover event of the cell pair in the MR data of the evaluation network.

5. The method of claim 4, wherein the calculating the demand adjustment level μ for the NR cell of the pair of cells further comprises:

acquiring the current transmitting power B of the NR cell;

if B + μ e [ P ]_c，Q_c]Adjusting the occurrence power of the NR cell from B to B + mu; said [ P ]_c，Q_c]Is a transmit power range of the NR cell; the P is_cIs the minimum value of the NR cell transmit power, the Q_cIs the maximum value of the NR cell transmit power.

6. The method of claim 5, further comprising:

if B + mu > Q_cAdjusting the NR cell generation power from B to Q_c(ii) a Comparing the NR cell original handover hysteresis HYST_oldHysteresis maximum threshold HYST for handover with the NR cell_maxSize of (e), if HYST_old＜HYST_maxSetting the NR cell handover hysteresis HYST to Min (HYST)_old+(B+μ-Q_c)，HYST_max) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

7. The method of claim 5, further comprising:

if B + mu < P_cAdjusting the NR cell generation power from B to P_c(ii) a Comparing the NR cell original handover hysteresis HYST_oldHysteresis minimum threshold HYST for handover with the NR cell_minSize of (e), if HYST_old＞HYST_minSetting the NR cell switching hysteresis HYST to Max (HYST)_old-(P_c-B-μ)，HYST_min) Otherwise, the NR cell handover hysteresis HYST is not adjusted.

8. An apparatus for evaluating cell handover, the apparatus comprising:

the acquisition module is used for acquiring MR data of the UE in the MR data of the evaluation network after data association; the UE is connected with a first cell and a second cell in the evaluation network simultaneously; the first cell and the second cell are a cell pair; the MR data comprises time information, the first cell information and the second cell information;

a first identification module, configured to identify that the UE performs handover of the first cell at a first handover time according to the time information and the first cell information in the MR data;

a second identification module, configured to identify that the UE performs handover of the second cell at a second handover time according to the time information and the second cell information in the MR data;

and the judging module is used for judging that an asynchronous switching event occurs to the cell pair once when the absolute value of the difference between the first switching time and the second switching time is greater than or equal to a preset value.

9. A cell handover evaluation device, comprising: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;

the memory is configured to store at least one executable instruction that causes the processor to perform the operations of the cell handover evaluation method of any of claims 1-7.

10. A computer-readable storage medium, having stored therein at least one executable instruction, which when run on a cell handover evaluation device/apparatus, causes the cell handover evaluation device/apparatus to perform the operations of the cell handover evaluation method according to any one of claims 1-7.

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