CN105992251B - A switching belt optimization method and device - Google Patents

Abstract

The invention discloses a handover band optimization method. In the method, the handover abnormality is detected for the neighbor cell relationship in each direction according to the signaling soft sampling data, and the measurement parameters are adjusted for the neighbor cell relationship that needs to be optimized according to the detection result; At the same time, the invention also discloses a switching belt optimization device.

Description

A switching belt optimization method and device

technical field

The present invention relates to wireless communication technology, in particular to a switching band optimization method and device.

Background technique

Handover is an important part of the mobility management of the Long Term Evolution (LTE) system, and the handover success rate is an important indicator of the mobility management performance of the LTE system.

The configuration of handover parameters of an LTE cell is a key factor for determining the successful handover of a user equipment (UE) from this cell to a neighboring cell. Handover parameter optimization has always been the focus and difficulty of mobile communication network optimization.

At present, the optimization of handover parameters mainly collects drive test data and measurement report (MR) data of the live network, and obtains recommended configuration values of handover parameters through manual analysis. Due to the large number of cells in the existing network, the recommended configuration values of handover parameters are the same for all neighboring cells of a cell by using manual analysis methods.

At present, the optimization of handover parameters cannot be optimized for a specific neighboring cell. This parameter setting method has the following disadvantages:

(1) The handover parameter configurations of all neighboring cells of a cell are basically the same, and handover optimization for a specific neighboring cell direction cannot be realized.

(2) The setting of handover parameters is only based on drive test data and measurement reports, the amount of data is insufficient, and the data is one-sided, which cannot fully reflect the detailed coverage and handover relationship between the source cell and each neighboring cell.

(3) When a problem occurs in the handover, the problem cannot be located quickly and accurately, and the execution efficiency of the optimization work is not high.

Contents of the invention

In order to solve the existing technical problems, the present invention mainly provides a switching band optimization method and device.

Technical scheme of the present invention is realized like this:

The present invention provides a switching band optimization method, the method comprising:

Handover anomalies are detected for neighbor cell relationships in each direction according to signaling soft sampling data;

According to the detection results, the measurement parameters are adjusted for the neighbor relationship that needs to be optimized.

In the above-mentioned scheme, the detection of handover abnormality of the neighboring cell relationship in each direction according to the signaling soft acquisition data includes:

According to the external data representation (XDR, External Data Representation) data collected by the signaling software, the radio resource control (RRC) connection re-establishment process information of the UU interface and the X2 handover process information of the X2 interface switch the neighbor cell relationship in each direction abnormally. Situation detection.

In the above scheme, the RRC connection reconstruction process information of the UU interface and the X2 handover process information of the X2 interface in the XDR data collected by the signaling software are used to perform handover abnormality detection on the neighbor cell relationship in each direction, including:

Extract all X2 switching process records from X2AP data and store them in the database;

Extract all RRC connection reconstruction process records in the same period of time from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, to determine whether the RRC connection reconstruction event is due to handover The abnormal condition causes, and toggles the type of abnormal condition.

In the above solution, the adjustment of the measurement parameters of the neighboring cell relationship that needs to be optimized according to the detection results includes: according to the detected type of abnormal handover of each neighboring cell relationship and the severity of the handover abnormality, the neighbor cell relationship that needs to be optimized Adjust the parameters that affect the handover behavior between cells.

In the above scheme, the method further includes: performing ping-pong handover detection on neighbor cell relations in each direction according to signaling soft sampling data, and adjusting measurement parameters for neighbor cell relations where ping-pong handover occurs according to the detection result of ping-pong handover.

In the above scheme, the ping-pong switching detection of the neighbor cell relationship in each direction according to the signaling soft sampling data includes:

Obtain the first time after the handover of the UE in the first neighboring cell relationship according to the X2 handover process record in the XDR data collected by the signaling software, and find the last time the UE performed handover in the second neighboring cell relationship before the first time. In the X2 handover record, the direction of the second neighbor relationship is opposite to that of the first neighbor relationship, if found, calculate the difference between the first time and the second time when the UE starts handover in the found X2 handover record value, determine whether the difference is smaller than the second threshold, if it is smaller than the second threshold, then determine that the handover of the UE in the first neighboring cell relationship is a ping-pong handover, if not found or greater than the second threshold, then determine The current handover of the UE in the first neighbor cell relationship is a non-ping-pong handover.

The present invention provides a switching belt optimization device, which includes: a first detection module and an adjustment module; wherein,

The first detection module is used to detect the handover abnormality of the neighbor cell relationship in each direction according to the signaling soft sampling data, and transmit the detection result to the adjustment module;

The adjustment module is used to adjust the measurement parameters of the neighboring cell relationship that needs to be optimized according to the detection result.

In the above solution, the first detection module is specifically used to switch the relationship between adjacent cells in each direction according to the RRC connection reconstruction process information of the UU interface in the XDR data of the signaling software and the X2 handover process information of the X2 interface. detection.

In the above solution, the first detection module is specifically used to extract all X2 switching process records from the X2AP data and store them in the database;

Extract all RRC connection reconstruction process records in the same period of time from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, to determine whether the RRC connection reconstruction event is due to handover The abnormal condition causes, and toggles the type of abnormal condition.

In the above scheme, the adjustment module is specifically used to make a parameter that affects inter-cell handover behavior in the neighboring cell relationship that needs to be optimized according to the type of the abnormal handover situation detected in each neighboring cell relationship and the severity of the abnormal handover situation. Adjustment.

In the above scheme, the device also includes: a second detection module, which is used to perform ping-pong handover detection on the neighbor cell relationship in each direction according to the signaling soft sampling data, and transmit the detection result to the adjustment module;

Correspondingly, the adjustment module is further configured to adjust the measurement parameters of the neighbor cell relationship where the ping-pong handover occurs according to the detection result of the ping-pong handover.

In the above solution, the second detection module is specifically configured to obtain the first time after the handover of the UE in the first neighbor cell relationship according to the X2 handover process record in the XDR data collected by the signaling software, and search the database for the UE in the first neighbor cell relationship. The X2 handover record of the last handover performed in the second adjacent cell relationship before the first time. The direction of the second adjacent cell relationship is opposite to that of the first adjacent cell relationship. If found, calculate the first time The difference between the found X2 handover record and the second time at which the UE starts handover is judged whether the difference is less than the second threshold, and if it is less than the second threshold, then determine the current time of the UE in the first neighbor relationship The handover is a ping-pong handover, and if it is not found or is greater than the second threshold, it is determined that the handover of the UE in the first neighboring cell relationship is a non-ping-pong handover.

The present invention provides a handover band optimization method and device, which detects the handover abnormality of the neighboring cell relations (Cell Relation) in each direction according to the signaling soft acquisition data, and measures the parameters of the neighboring cell relations that need to be optimized according to the detection results In this way, handover problems in the network can be found automatically, timely and accurately, and a detailed handover parameter optimization scheme for specific neighbor relationship can be proposed quickly, which greatly improves the efficiency of handover optimization and saves manpower , material resources. According to the existing network optimization experience, the processing speed of manual analysis is about 200 cells/person/day, and the processing speed of this method is 16,000 cells/hour, which improves the efficiency by about 640 times.

Description of drawings

FIG. 1 is a schematic flowchart of a switching band optimization method provided by an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of detecting an abnormal handover situation provided by an embodiment of the present invention;

FIG. 3 is a schematic flow diagram of detecting ping-pong switching provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a switching band optimization device provided by an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, the handover abnormality detection is performed on the neighbor cell relationship in each direction according to the soft sampling data of the signaling, and the measurement parameters of the neighbor cell relationship to be optimized are adjusted according to the detection result.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The embodiment of the present invention implements a switching band optimization method, as shown in Figure 1, the method includes the following steps:

Step 101: According to the signaling soft sampling data, the handover abnormality detection is performed on the neighbor cell relationship in each direction;

Specifically, according to the radio resource control (RRC) connection reconstruction process information of the UU interface in the XDR data collected by the signaling software and the X2 handover process information of the X2 interface, the abnormal situation of the handover is detected for the neighbor cell relationship in each direction, and the handover Abnormal situation detection includes: carry out the detection of switching too early, switching too late and switching to the wrong cell, and the neighbor cell relationship is such as: assuming that cell (Cell) A and Cell B are adjacent cells, so the direction from Cell A to Cell B is One neighbor relationship, the direction from Cell B to Cell A is another neighbor relationship.

The XDR data refers to the detailed records of signaling and services generated after processing based on the full amount of data for online log retention and signaling monitoring applications.

According to the RRC connection reconstruction process information of the UU interface and the X2 handover process information of the X2 interface in the XDR data collected by the signaling softly, the neighbor cell relationship in each direction is switched to abnormal situation detection, including:

Extract all X2 switching process records from X2AP data and store them in the database;

Extract all the RRC connection reconstruction process records in the same time period as the X2 handover process records from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, judge the RRC connection reconstruction Whether the event was due to a handover exception, and the type of handover exception.

As shown in Figure 2, taking the RRC connection reestablishment message of the UE received by Cell A in the RRC connection reestablishment process record as an example, it is judged according to the timestamp of the RRC connection reestablishment message whether it is sent during UE handover;

If the RRC connection re-establishment message is sent during UE handover, judge whether Cell A is the source cell of the handover according to the X2 handover process record corresponding to the RRC connection re-establishment message, and if Cell A is the source cell of the handover, it is considered to be During the UE handover process (handover preparation phase or handover execution phase), the source cell initiates RRC connection re-establishment, which is a case where the handover is too early; if Cell A is not the source cell of the handover, then according to the X2 handover process corresponding to the RRC connection re-establishment message Record and judge whether Cell A is the target cell for handover. If Cell A is the target cell for handover, it is considered that the UE initiates RRC connection re-establishment in the target cell during the handover process (handover preparation phase), which is too late for handover; if Cell A If it is not the target cell of the handover, it is considered that the UE initiates RRC connection re-establishment in a third cell other than the source cell and the target cell during the UE handover process, which is the case of handover to the wrong cell;

If the RRC connection re-establishment message is not sent during UE handover, judge whether the time between the RRC connection re-establishment (re-establishment) operation and the last UE handover is less than the first threshold according to the X2 handover process record corresponding to the RRC connection re-establishment message , the first threshold is a preset value, an appropriate value can be determined according to experiments, if it is less than the first threshold, then judge whether Cell A is the source cell for handover according to the X2 handover process record corresponding to the RRC connection reestablishment message , if Cell A is the source cell of the handover, it is considered that the air interface connection failure (RLF, Radio Link Failure) in the target cell CellB occurs within a short period of time after the UE handover is successful, and then RRC connection reestablishment is initiated in the source cell Cell A, for the handover Premature situation; if Cell A is not the source cell of the handover, then judge whether Cell A is the target cell of the handover according to the X2 handover flow record corresponding to the RRC connection reestablishment message, if Cell A is the target cell of the handover, then consider it to be The coverage problem causes RRC connection re-establishment to be initiated in the target cell Cell A within a short time after UE handover, which is a normal RRC connection re-establishment operation; if Cell A is not the target cell of handover, it is considered that RLF has occurred after UE handover, and the The third cell other than the target cell initiates RRC connection reestablishment, which is the case of switching to the wrong cell;

If it is greater than the first threshold, then search for the Cell B where the UE is before initiating RRC connection re-establishment, and judge whether Cell A and Cell B are the same cell (A==B?), if yes, consider that the UE is in normal business RLF is a normal RRC connection re-establishment operation; if not, it is considered that RLF occurs when the UE is in the normal service of Cell B, and the RRC connection re-establishment is indeed initiated in Cell A, which is a case where the handover is too late.

Step 102: Adjust the measurement parameters of the neighboring cell relationship to be optimized according to the detection result;

Specifically, according to the detected type of abnormal handover of each neighboring cell relationship and the severity of the abnormal handover, adjustments are made to the parameters that affect the handover behavior between cells in the neighboring cell relationship that needs to be optimized; wherein, the abnormal handover The type of handover can be premature handover, handover too late, and handover to the wrong cell, and the severity of the abnormal handover can be the number of times the handover abnormality occurs within a set period of time, and the more the number of times, the higher the severity; The parameter that affects inter-cell handover behavior may be a cell offset parameter (CIO), and the neighbor cell relationship that needs to be optimized may be an adjustment threshold, and when the severity of the handover abnormality of the neighbor cell relationship reaches the threshold value, The neighbor relationship is the neighbor relationship that needs to be optimized.

The method also includes: performing ping-pong handover detection on the neighbor cell relationship in each direction according to the signaling soft sampling data, and adjusting the measurement parameters of the neighbor cell relationship where the ping-pong handover occurs according to the detection result of the ping-pong handover;

Specifically, according to the X2 handover process record in the XDR data collected by the signaling software, the first time after the handover of the UE in the first neighbor cell relationship is obtained, and the last time the UE was in the second handover before the first time is searched in the database. The X2 handover record of the handover performed by the neighbor cell relationship. The direction of the second neighbor cell relationship is opposite to the direction of the first neighbor cell relationship. If found, calculate the first time and the UE start handover in the found X2 handover record. The difference of the second time, judge whether the difference is less than the second threshold, if it is less than the second threshold, then determine that the handover of the UE in the first neighbor relationship is a ping-pong handover, if not found or greater than With the second threshold, it is determined that the current handover of the UE in the first neighboring cell relationship is a non-ping-pong handover. Here, the second threshold is a preset value, and an appropriate value can be determined through experiments.

The adjustment of the measurement parameters for the neighbor cell relationship where ping-pong handover occurs may be to count the number of ping-pong handover occurrences in each neighbor cell relationship, and give priority to the CIO of the neighbor cell relationship with the most adjusted times.

As shown in Figure 3, all X2 handover process records are extracted from the X2AP data. Taking an X2 handover process record of UE handover from Cell A to Cell B as an example, according to the X2 handover process record, the UE handover from Cell A to Cell B is obtained. The time of Cell B is t, find the X2 handover process record of the UE that was handed over from Cell B to Cell A last time before time t, if found, calculate the time t and the UE start in the found X2 handover process record The time difference of the handover determines whether the difference is smaller than the second threshold, if it is smaller than the second threshold, it is determined that the UE handover from Cell A to Cell B is a ping-pong handover, otherwise, it is a non-ping-pong handover.

The above method can be executed by the server, and can also be executed by the client installed on the PC.

In order to realize the above method, the present invention also provides a switching band optimization device, as shown in FIG. 4 , the device includes: a first detection module 41 and an adjustment module 42; wherein,

The first detection module 41 is used to detect the handover abnormality of the neighbor cell relationship in each direction according to the soft sampling data of the signaling, and transmit the detection result to the adjustment module 42;

An adjustment module 42, configured to adjust the measurement parameters for the neighboring cell relationship to be optimized according to the detection results;

The first detection module 41 performs handover abnormality detection on the neighbor cell relationship in each direction according to the radio resource control (RRC) connection reconstruction process information of the UU interface in the XDR data collected by the signaling software and the X2 handover process information of the X2 interface, The detection of the abnormal situation of handover includes: detection of handover too early, handover too late and handover to a wrong cell.

According to the radio resource control (RRC) connection reconstruction process information of the UU interface and the X2 handover process information of the X2 interface in the XDR data collected by the signaling softly, the neighbor cell relationship in each direction is switched to abnormal situation detection, including:

Extract all X2 switching process records from X2AP data and store them in the database;

Extract all RRC connection reconstruction process records in the same period of time from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, to determine whether the RRC connection reconstruction event is due to handover The abnormal condition causes, and toggles the type of abnormal condition.

The adjustment module 42 is specifically configured to adjust the parameters that affect inter-cell handover behavior in the neighboring cell relationship that needs to be optimized according to the type of the detected abnormal handover situation of each neighboring cell relationship and the severity of the abnormal handover situation; wherein , the type of the abnormal handover can be too early handover, too late handover and handover to the wrong cell, the severity of the abnormal handover can be counted the number of times the abnormal handover occurs within a set time period, the more the number of times , the higher the severity; the parameter that affects inter-cell handover behavior may be CIO, and the neighbor relationship that needs to be optimized may be an adjustment threshold, and when the severity of the handover abnormality of the neighbor relationship reaches the threshold, The neighbor relationship is the neighbor relationship that needs to be optimized.

The device also includes: a second detection module 43, which is used to perform ping-pong handover detection on the neighbor cell relationship in each direction according to the signaling soft sampling data, and transmit the detection result to the adjustment module 42;

Correspondingly, the adjustment module 42 adjusts the measurement parameters for the neighbor cell relationship where the ping-pong handover occurs according to the detection result of the ping-pong handover;

Specifically, the second detection module 43 obtains the first time after the handover of the UE in the first neighboring cell relationship according to the X2 handover process record in the XDR data collected by the signaling software, and searches the database for the UE in the first neighbor cell relationship. The X2 handover record of the last handover performed in the second neighboring cell relationship before the time. The direction of the second neighboring cell relationship is opposite to that of the first neighboring cell relationship. If found, calculate the first time and the found X2 The difference of the second time when the UE starts handover in the handover record, judge whether the difference is less than the second threshold, if it is less than the second threshold, then determine that the handover of the UE in the first neighbor relationship is a ping-pong handover , if not found or greater than the second threshold, determine that the current handover of the UE in the first neighbor relationship is a non-ping-pong handover.

In practical applications, the functions of the first detection module 41, the adjustment module 42 and the second detection module 43 can be controlled by a central processing unit (CPU), a microprocessor (MPU), or a digital signal processor (DSP) located in the device. ), or programmable gate array (FPGA) implementation.

To sum up, according to the soft mining data of signaling, detection and optimization of handover anomalies and ping-pong handovers can greatly improve the accuracy and pertinence of handover optimization, significantly reduce the occurrence of handover anomalies and ping-pong handovers, and improve handover performance. Success rate.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (10)

1. A switching band optimization method, characterized in that the method comprises: According to the signaling soft sampling data, the abnormal situation of the neighbor cell in each direction is detected. Among them, if the starting point and the end point are exchanged between adjacent cells, the direction is changed and different neighbor cell relationships are formed; According to the detection results, the measurement parameters are adjusted for the neighbor relationship that needs to be optimized; According to the signaling soft acquisition data, the detection of the abnormal situation of handover of the neighbor cell relationship in each direction includes: According to the radio resource control (RRC) connection reestablishment process information of the UU interface and the X2 handover process information of the X2 interface in the external data representation (XDR) data collected by the signaling software, the handover abnormality detection is performed on the neighbor cell relationship in each direction. 2. The method according to claim 1, characterized in that the neighbor cell relationship in each direction is carried out according to the RRC connection reconstruction process information of the UU interface and the X2 handover process information of the X2 interface in the XDR data according to the signaling software Toggle anomaly detection, including: Extract all X2 switching process records from X2AP data and store them in the database; Extract all RRC connection reconstruction process records in the same period of time from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, to determine whether the RRC connection reconstruction event is due to handover The abnormal condition causes, and toggles the type of abnormal condition. 3. The method according to claim 2, characterized in that, the adjustment of the measurement parameters for the neighboring cell relationships that need to be optimized according to the detection results includes: according to the detected type and abnormal handover of each neighboring cell relationship The severity of the situation adjusts the parameters that affect inter-cell handover behavior in the neighbor cell relationship that needs to be optimized. 4. The method according to claim 1, characterized in that, the method also includes: according to the signaling soft sampling data, the neighbor cell relationship in each direction is detected by ping-pong handover, and according to the detection result of ping-pong handover, the ping-pong handover occurs Adjust the measurement parameters based on the neighbor cell relationship. 5. method according to claim 4, is characterized in that, described according to signaling softly collects data and carries out ping-pong handover detection to the neighboring cell relation of each direction comprises: Obtain the first time after the handover of the UE in the first neighboring cell relationship according to the X2 handover process record in the XDR data collected by the signaling software, and find the last time the UE performed handover in the second neighboring cell relationship before the first time. In the X2 handover record, the direction of the second neighbor relationship is opposite to that of the first neighbor relationship, if found, calculate the difference between the first time and the second time when the UE starts handover in the found X2 handover record value, determine whether the difference is smaller than the second threshold, if it is smaller than the second threshold, then determine that the handover of the UE in the first neighboring cell relationship is a ping-pong handover, if not found or greater than the second threshold, then determine The current handover of the UE in the first neighbor cell relationship is a non-ping-pong handover. 6. A switching band optimization device, characterized in that the device comprises: a first detection module and an adjustment module; wherein, The first detection module is used to detect the handover abnormality of the neighbor cell relationship in each direction according to the soft sampling data of the signaling, and transmit the detection result to the adjustment module, wherein, if the starting point and the end point are changed between adjacent cells, the The direction is determined to form different neighborhood relationships; An adjustment module is used to adjust the measurement parameters of the neighboring cell relationship that needs to be optimized according to the detection results; The first detection module is specifically used to detect the handover abnormality of the neighbor cell relationship in each direction according to the RRC connection reconstruction process information of the UU interface and the X2 handover process information of the X2 interface in the XDR data collected by the signaling software. 7. The device according to claim 6, wherein the first detection module is specifically configured to extract all X2 switching process records from X2AP data and store them in a database; Extract all RRC connection reconstruction process records in the same period of time from the UU interface data, and scan the scene of each RRC connection reconstruction event one by one, combined with the corresponding X2 handover process records in the database, to determine whether the RRC connection reconstruction event is due to handover The abnormal condition causes, and toggles the type of abnormal condition. 8. The device according to claim 7, wherein the adjustment module is specifically configured to select the neighbor cells to be optimized according to the type of the detected abnormal handover situation and the severity of the abnormal handover situation of each neighboring cell relationship detected. Adjust the parameters in the relationship that affect the handover behavior between cells. 9. The device according to claim 6, further comprising: a second detection module, configured to perform ping-pong handover detection on neighbor cell relations in each direction according to signaling soft sampling data, and transmit the detection results to said adjustment module; Correspondingly, the adjustment module is further configured to adjust the measurement parameters of the neighbor cell relationship where the ping-pong handover occurs according to the detection result of the ping-pong handover. 10. The device according to claim 9, wherein the second detection module is specifically configured to obtain the first UE handover process record in the first neighbor cell relationship according to the X2 handover process record in the XDR data collected by the signaling software. time, and search the database for the X2 handover record of the last handover performed by the UE in the second neighboring cell relationship before the first time, and the direction of the second neighboring cell relationship is opposite to that of the first neighboring cell relationship , if it is found, calculate the difference between the first time and the second time when the UE starts handover in the found X2 handover record, and determine whether the difference is less than a second threshold, and if it is less than the second threshold, determine the The current handover of the UE in the first neighboring cell relationship is a ping-pong handover, and if it is not found or exceeds the second threshold, it is determined that the current handover of the UE in the first neighboring cell relationship is a non-ping-pong handover.