CN110876161A

CN110876161A - Cell discovery method, device and computer readable storage medium

Info

Publication number: CN110876161A
Application number: CN201811012025.8A
Authority: CN
Inventors: 夏中英; 柯雅珠
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-03-10
Anticipated expiration: 2038-08-31
Also published as: CN110876161B; WO2020043189A1

Abstract

The invention discloses a cell discovery method, a device and a computer readable storage medium, comprising: a network node acquires a Physical Cell Identity (PCI) and a frequency point of a first cell from a measurement report reported by User Equipment (UE); the first cell is a cell which does not exist in a neighbor relation table pre-stored by a network node; searching a cell which is located in a preset search range, has the same PCI as that of the first cell and has the same frequency point as that of the first cell in prestored parameter configuration information, and using the cell as a second cell; and if the second cell is unique, determining the second cell as an unknown cell, and acquiring a global cell identity (CGI) of the unknown cell from the parameter configuration information. It can be seen from the embodiments of the present invention that, since the CGI of the unknown cell is obtained in a non-air interface manner, an increase in call drop rate is avoided, and a decrease in network performance is prevented.

Description

Cell discovery method, device and computer readable storage medium

Technical Field

Embodiments of the present invention relate to the field of communications technologies, and in particular, to a cell discovery method and apparatus, and a computer-readable storage medium.

Background

An Automatic Neighbor Relation (ANR) function is an important function in a self-organizing and self-optimizing Network (SON) technology, and different from a traditional method that a Network engineer is mainly used for configuration and adjustment according to a field survey situation, the ANR function can trigger a base station to open measurement and collect data, so that the Neighbor Relation is optimized.

In Long Term Evolution (LTE) technology, an ANR function is implemented with assistance of User Equipment (UE), and an ANR measurement procedure is that a serving Cell/base station issues measurement configuration reporting a Global Identity (CGI) to the UE, so that the UE measures CGIs of an unknown Cell adjacent to a serving Cell where the UE is located.

However, due to the introduction of additional measurements, if multiple UEs perform CGI measurements simultaneously, the call drop rate may be increased and the network performance may be degraded.

Disclosure of Invention

In order to solve the foregoing technical problem, embodiments of the present invention provide a cell discovery method, an apparatus, and a computer-readable storage medium, which can avoid an increase in a call drop rate and prevent a decrease in network performance.

In order to achieve the object of the present invention, an embodiment of the present invention provides a cell discovery method, including:

the network node acquires the PCI and the frequency point of the first cell from the measurement report reported by the UE; wherein the first cell is a cell that does not exist in a neighbor relation table pre-stored by the network node;

searching a cell which is located in a preset search range, has the same PCI as that of the first cell and has the same frequency point as that of the first cell in prestored parameter configuration information, and using the cell as a second cell;

and if the second cell is unique, determining that the second cell is an unknown cell, and acquiring the CGI of the unknown cell from the parameter configuration information.

An embodiment of the present invention further provides a network node, including:

an obtaining module, configured to obtain a PCI and a frequency point of a first cell from a measurement report reported by a UE; wherein the first cell is a cell that does not exist in a neighbor relation table pre-stored by the network node;

the searching module is used for searching a cell which is located in a preset searching range, has the same PCI as that of the first cell and has the same frequency point as that of the first cell in the prestored parameter configuration information to serve as a second cell;

and the processing module is used for determining that the second cell is an unknown cell if the second cell is unique, and acquiring the CGI of the unknown cell from the parameter configuration information.

An embodiment of the present invention further provides a network node, including: a processor and a memory, wherein the memory has stored therein the following instructions executable by the processor:

obtaining the PCI and the frequency point of a first cell from a measurement report reported by UE; wherein the first cell is a cell that does not exist in a neighbor relation table pre-stored by the network node;

An embodiment of the present invention further provides a computer-readable storage medium, where the storage medium stores computer-executable instructions, and the computer-executable instructions are configured to perform the following steps:

Compared with the prior art, the CGI of the unknown cell is obtained by the network node according to the parameter configuration information and the measurement report reported by the UE, so that the CGI of the unknown cell is obtained in a non-air interface mode, the increase of the call drop rate is avoided, and the reduction of the network performance is prevented.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a flowchart illustrating a cell discovery method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of directions of a serving cell and an unknown neighboring cell according to an embodiment of the present invention;

fig. 3 is a schematic view of a location of another serving cell and an unknown neighboring cell according to an embodiment of the present invention;

fig. 4 is a schematic diagram of directions of another serving cell and an unknown neighboring cell according to an embodiment of the present invention;

fig. 5 is a schematic diagram of directions of another serving cell and an unknown neighboring cell according to an embodiment of the present invention;

fig. 6 is a schematic diagram of directions of another serving cell and an unknown neighboring cell according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a network node according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

Before explaining the cell discovery method provided by the embodiment of the present invention, some prior arts are explained:

a complete ANR measurement flow mainly comprises the following steps:

step 1, the service cell/base station issues measurement configuration to the UE.

And step 2, the UE reports the detected Physical Cell Identity (PCI) to the serving Cell/base station through a measurement report.

And 3, comparing the PCI with all the neighbor cells in the neighbor cell list by the serving cell/base station, and judging whether the PCI is unknown in the neighbor cell list. If the CGI is unknown, selecting proper UE, and sending report CGI measurement configuration to enable the UE to measure the CGI of the unknown neighboring cell.

And step 4, the UE executes measurement according to the measurement configuration of the service cell/base station, obtains the CGI of the neighboring cell and reports the CGI to the eNB.

And step 5, the base station adds the neighbor cell relation (the corresponding relation between the PCI and the CGI) to a neighbor cell relation table (NRT).

It should be noted that the number of PCIs is limited, and different cells can reuse the same PCI, but the CGI is unique. Therefore, only if the CGI is obtained, it can be uniquely determined which neighbor cell the UE measured. Therefore, the UE can be migrated to the correct adjacent cell when services such as switching, load balancing and the like are carried out. Otherwise, the network performance is reduced once the error occurs.

An embodiment of the present invention provides a cell discovery method, as shown in fig. 1, the method includes:

step 101, a network node acquires a PCI and a frequency point of a first cell from a measurement report reported by UE.

The first cell is a cell which does not exist in a neighbor relation table pre-stored by the network node.

It should be noted that the network node may specifically be a base station, and may also be a network manager located at an upper layer of the base station. The parameter configuration information includes information such as PCI, CGI, frequency point, latitude and longitude of all cells, and may be displayed in a table form, that is, a parameter configuration table.

It should be further noted that the measurement report includes: PCI information, signal strength information and frequency point information of the cell searched by the UE. The neighbor relation table includes all known cell PCIs, frequency points, and CGIs.

And 102, searching a cell which is located in a preset search range, has the same PCI as that of the first cell and has the same frequency point as that of the first cell in the prestored parameter configuration information, and using the cell as a second cell.

And 103, if the second cell is unique, determining that the second cell is an unknown cell, and acquiring the CGI of the unknown cell from the parameter configuration information.

It should be noted that, because the new air interface (5 generation new Radio, 5GNR) standard of the fifth generation mobile communication technology is not yet perfect, the UE cannot implement CGI measurement in the 5G NR cell by using the existing method, but the cell discovery method provided in the embodiment of the present invention is performed based on a non-air interface manner, and thus can be used in the 5G NR cell.

According to the cell discovery method provided by the embodiment of the invention, the network node acquires the CGI of the unknown cell according to the parameter configuration information and the measurement report reported by the UE, so that the CGI of the unknown cell is acquired in a non-air interface manner, the increase of the call drop rate is avoided, and the reduction of the network performance is prevented.

Optionally, searching for a cell, which is located in a preset search range and has the same PCI as that of the first cell and has the same frequency point as that of the first cell, in the pre-stored parameter configuration information, includes:

the signal strengths of the serving cell and the first cell are obtained from the measurement report.

And judging whether the signal intensity of the serving cell is greater than a first preset threshold value or not and whether the signal intensity of the first cell is greater than a second preset threshold value or not.

And if the signal intensity of the service cell is not less than the first preset threshold value and the signal intensity of the first cell is not less than the second preset threshold value, searching for the cell which is located in the preset search range, has the same PCI as the PCI of the first cell and has the same frequency point as the frequency point of the first cell in the parameter configuration information.

It should be noted that the first cell may or may not be unique. And if the signal strength of the serving cell is smaller than a first preset threshold value, or no cell with the signal strength not smaller than a second preset threshold value exists in the first cell, discarding the measurement report.

Optionally, if the second cell is not unique, further comprising:

and searching a cell which exists in the adjacent cell relation and has the signal intensity larger than a third preset threshold value according to the measurement report, and using the cell as a reference cell.

And acquiring beam information of the second cell, the reference cell and the serving cell from the measurement report.

And determining an unknown cell in the second cell according to the beam information and the parameter configuration information of the second cell, the reference cell and the serving cell, and acquiring the CGI of the unknown cell from the parameter configuration information.

Optionally, determining an unknown cell in the second cell according to the beam information and the parameter configuration information of the second cell, the reference cell, and the serving cell includes:

calculating the number of the overlapping of the wave beam of each second cell and the wave beam of the target cell according to the wave beam information and the parameter configuration information of the second cells, the reference cell and the service cell; wherein the target cell comprises: a serving cell and a reference cell.

And selecting the cell with the maximum number of the overlapped beams and the target cell as a third cell according to the obtained number of the overlapped beams.

And if the third cell is unique, determining the third cell as an unknown cell.

Optionally, calculating the number of overlapping beams of each second cell and the target cell according to the beam information and the parameter configuration information of the second cells, the reference cell, and the serving cell includes:

judging whether the wave beam of the ith second cell is overlapped with the wave beam of the jth target cell according to the wave beam information and the parameter configuration information of the second cell, the reference cell and the service cell; where i is 1 … M, j is 1 … N, M is the number of second cells, and N is the number of target cells.

And if the beams overlap, increasing the number of the overlapping of the beam of the ith second cell and the beam of the target cell by 1 until j equals to N, and obtaining the number of the overlapping of the beam of the ith second cell and the beam of the target cell.

Specifically, if the ith second cell and the serving cell overlap in angular range, the result of the counting is 1, and if the ith second cell and the serving cell and a reference cell overlap in angular range, the result of the counting is 2, and so on.

Optionally, the determining, according to the beam information and the parameter configuration information of the second cell, the reference cell, and the serving cell, whether the beam of the ith second cell overlaps with the beam of the jth target cell includes:

and respectively acquiring the direction angle, the longitude and the latitude of the ith second cell and the jth target cell from the parameter configuration information.

And calculating the angle range corresponding to the beams of the ith second cell and the jth target cell according to the direction angles of the ith second cell and the jth target cell and the beam information of the ith second cell and the jth target cell.

And calculating the included angle between the connecting line from the ith second cell to the jth target cell and the horizontal direction of the jth target cell according to the longitude and latitude of the ith second cell and the jth target cell.

And judging whether the wave beam of the ith second cell is overlapped with the wave beam of the jth target cell according to the angle range corresponding to the wave beam of the ith second cell, the angle range corresponding to the wave beam of the jth target cell and the obtained included angle.

Optionally, if the third cell is not unique, further comprising:

and acquiring the longitude and latitude of the service cell and each third cell from the parameter configuration information.

And calculating the distance between each third cell and the service cell according to the obtained longitude and latitude.

And acquiring a third cell with the shortest distance to the serving cell as an unknown cell.

Optionally, the preset search range includes: and taking the serving cell as a center, and taking the distance from the signal propagation of the serving cell to the intensity attenuation to the third preset threshold value as a radius to form a coverage range.

Optionally, after obtaining the CGI of the unknown cell, the method further includes:

and adding the corresponding relation of the CGI, the PCI and the frequency point of the unknown cell into the neighbor cell relation table.

The embodiment of the invention also provides a cell discovery method, which comprises the following steps:

step 1, a network side collects a measurement report of a UE, and obtains a PCI of an unknown neighboring cell, where the unknown neighboring cell is a neighboring cell that needs to determine a CGI in the cell sending method provided in this embodiment.

And 2, if the signal strengths of the serving cell and the unknown neighbor cell in the measurement report are both greater than or equal to a set threshold, reserving the cell and continuing to execute the subsequent steps. Otherwise, discarding.

And 3, searching the frequency point and the PCI of the unknown neighbor cell in the parameter configuration information by the network side, wherein the search range is a square area taking the service cell as the center, and the side length of the square can be determined according to the signal coverage range of the service cell.

And 4, if a plurality of cells with the same frequency point and PCI as the unknown neighbor cells exist in the search range, further judging which cell is the real unknown neighbor cell by utilizing the beam information of the serving cell and the unknown neighbor cells in the measurement report.

The detailed judgment step of the step 4 is as follows:

and 4.1, traversing each unknown neighboring cell in the search range.

And 4.2, respectively judging whether the angle range corresponding to the wave beam of the unknown neighbor cell is overlapped with the angle ranges corresponding to the wave beams of the service cell and other known neighbor cells in the measurement report. The known neighbor cell comprises a known neighbor cell with the signal strength greater than or equal to a set threshold.

And 4.3, finding out the unknown adjacent cell with the maximum count value after all the unknown adjacent cells are traversed. If there is only one, the unknown neighbor cell is the true unknown neighbor cell. And if the number of the unknown neighbor cells is more than one, respectively calculating the distances from the unknown neighbor cells to the service cell by utilizing the longitude and latitude information in the parameter configuration information. And selecting the cell with the closest distance as a real unknown neighbor cell.

And 5, after the judgment is finished, adding the determined relevant information of the unknown adjacent cell into the adjacent cell list.

In the above step, the method for determining whether the angle ranges corresponding to the beams of the two cells overlap is as follows:

and 4.2.1, respectively calculating the angle ranges of the beams of the serving cell and the unknown neighbor cells by using the direction angles of the serving cell and the unknown neighbor cells in the parameter configuration information and the beam information of the serving cell and the unknown neighbor cells in the measurement report.

And 4.2.2, calculating an included angle between a connection line from the serving cell to the unknown neighbor cell and the horizontal direction of the serving cell by utilizing the longitude and latitude of the serving cell and the unknown neighbor cell in the parameter configuration information.

And 4.2.3, judging whether the angle ranges of the two cells are overlapped or not according to the angle range of the beam of the service cell, the angle range of the beam of the unknown neighbor cell and the obtained included angle.

Specifically, assume that the angle range of the beam of the serving cell is [ a1, a2], the angle range of the beam of the unknown neighboring cell is [ θ 1, θ 2], and the angle between the connection line from the serving cell to the unknown neighboring cell and the horizontal direction of the serving cell is c. If Δ θ is θ 2 — θ 1 and is the width of the unknown neighbor beam, the determination condition may be as shown in table 1 below, and if the determination condition is satisfied, it indicates that the angular ranges of the two cells overlap, otherwise, there is no overlap.

TABLE 1

Note that N/a indicates that no other condition exists. If the unknown neighbor beam is in the horizontal direction, then θ 1 refers to the angle below the horizontal line. I.e. the beam is considered to be from a negative angle to a positive angle. But the expression needs to be scaled to a positive angle.

It should be noted that if the unknown neighboring cell is compared with the reference neighboring cell, the reference neighboring cell is used to replace the location of the serving cell, that is, [ a1, a2] in the table represents the beam of the reference neighboring cell, and c represents the included angle between the connection line from the reference neighboring cell to the unknown neighboring cell and the horizontal direction of the reference neighboring cell.

Several of the cases in table 1 are illustrated below:

case one, a1< c < a2

As shown in fig. 2, if the angle between the connection line from the serving cell to the unknown neighboring cell and the horizontal direction of the serving cell is c and the angle between the beam of the serving cell and the horizontal direction is [ a1, a2], if c falls between [ a1, a2], that is, a1< c < a2, the beams of the unknown neighboring cells overlap each other regardless of the beam direction.

Case two, c < a1, or c > a2

Assuming that the angle range of the serving cell beam is [ a1, a2], and the included angle between the connection line from the serving cell to the unknown neighboring cell and the horizontal direction of the serving cell is c, the region where the unknown neighboring cell beam and the serving cell beam overlap is the region starting from the solid line of the unknown neighboring cell in fig. 3 and rotating counterclockwise to the region of the dashed line of the unknown neighboring cell in fig. 4.

The solid line region is characterized by b2 ═ a1, i.e., if the serving cell beam is moved in parallel to the unknown neighbor, the line to the far right of the serving cell beam and the line to the far left of the unknown neighbor beam coincide. In this case, since the two lines are parallel, neither beam will ever intersect, but once the unknown neighbor beam is deflected a little to the left, i.e., b2> a1, the two beams overlap. This is therefore a boundary.

The dotted area is characterized by b1 ═ c +180, that is, the leftmost line of the unknown neighbor beam coincides with the line connecting two cells, so that the serving cell beam and the unknown neighbor beam can be measured at the serving cell site at the same time, and once the unknown neighbor beam deviates a little to the right, that is, b1> c +180, there is no overlap. This is therefore another boundary.

Assuming that the angle range of the unknown neighbor cell beam is [ θ 1, θ 2], according to the above analysis, if the unknown neighbor cell beam overlaps with the serving cell beam, it must satisfy:

a1-Δθ<θ1<c+180

Δθ＝θ2-θ1

that is, if the unknown neighboring cell satisfies the above condition, it is a possible unknown neighboring cell.

The reverse direction of the third case and the c is between the cases [ a1, a2]

The opposite direction of the angle c between the connection line from the serving cell to the unknown neighboring cell and the horizontal direction of the serving cell is between serving cell beams, i.e. a1< c +180< a 2. In this case, the region where the unknown neighbor beam and the serving cell beam overlap is an interval starting from the region of the solid line of the unknown neighbor in fig. 5 and rotating counterclockwise to the region of the dashed line of the unknown neighbor in fig. 6.

The solid line region is characterized by b2 being a1, i.e. if the serving cell beam is moved in parallel to the unknown neighbor, the line to the far left of the serving cell beam and the line to the far right of the unknown neighbor beam coincide, in which case the two beams never intersect because they are parallel, but once the unknown neighbor beam is shifted a little to the right, i.e. b2> a1, the two beams overlap. This is therefore a boundary.

The dashed area is characterized by b 1-a 2. I.e. if the serving cell beam is moved in parallel to the unknown neighbor, the rightmost line of the serving cell beam and the leftmost line of the unknown neighbor beam coincide, in which case the two beams never intersect because they are parallel, but once the unknown neighbor beam is shifted a little to the left, i.e. b1< a2, the two beams overlap, and thus are another boundary.

a1-Δθ<θ1<a2

Δθ＝θ2-θ1

that is, if the unknown neighboring cell satisfies the above condition, it is a possible unknown neighboring cell

Specifically, the calculation method of c: and converting the longitude and latitude of the service cell and the unknown adjacent cell in the parameter configuration information into rectangular coordinates x and y, calculating delta x and delta y of the two points, and obtaining an included angle between a connecting line of the two points and the horizontal direction by utilizing an arc tangent function. Note that the reference point here is the serving cell. I.e. the vector is directed from the serving cell to an unknown neighbor.

[ a1, a2] calculation method: here, a mapping relationship, i.e. a corresponding relationship between the beam and the direction angle, is required, and the beam is usually relative to the coverage area of the cell. For example, the coverage area of a cell is [0,120], the cell has 8 beams in total, and the width of each beam is 15 degrees. Then beam 1 corresponds to an angular range of [0,15], beam 2 corresponds to an angular range of [15,30], and so on.

The direction angle of the cell can be obtained from the parameter configuration information, if it is a directional station, the sector center line (assumed as x) of the cell can be obtained according to the parameter configuration information, and if each sector covers 120 degrees, the coverage area of the cell is [ x-60, x +60] degrees. The angular range of beam 1 is then [ x-60, x-60+15] degrees, the angular range of beam 2 is [ x-60+15, x-60+30], and so on. In the case of an omni-directional station, the cell has a total of 8 beams, each having a width of 45 degrees. Then beam 1 corresponds to an angular range of [0,45], beam 2 corresponds to an angular range of [45,90], and so on.

[ θ 1, θ 2] calculation method: the calculation method of [ theta 1, theta 2] is similar to [ a1, a2] and is not repeated here.

It should be noted that, by using the measurement report and the parameter configuration information acquired by the LTE external field, the correct probability of the method may be obtained through simulation, and we assume that a certain neighboring cell is an unknown neighboring cell, and determine the CGI of the neighboring cell by using the method, and then compare the CGI with the cell id in the measurement report data, where the two are consistent, that is, the judgment is correct.

The simulation result of the accuracy of the cell discovery method provided by the present invention is shown in table 2, and when the Reference Signal Receiving Power (RSRP) threshold is higher, the accuracy is higher, so that if the RSRP threshold is configured properly, the accuracy can reach 100%.

TABLE 2

Several scenarios are provided below to illustrate the cell discovery method provided by the present invention:

in a scenario one, an independent networking (SA) scenario, that is, a 5G NR independent networking scenario, the cell discovery method provided in the embodiment of the present invention includes:

step 1, the network side collects a measurement report of the UE, acquires a PCI of the neighboring cell, and determines whether the PCI exists in the neighboring cell table, and if the PCI does not exist in the neighboring cell table, it is an unknown neighboring cell (collectively referred to as an unknown neighboring cell in this scenario for convenience of description) for which the CGI needs to be determined in this embodiment.

And 2, the network side judges according to the related information in the measurement report reported by the UE, if the signal strength of the service cell and the unknown neighbor cell is greater than or equal to the set threshold, the measurement report is considered to be an effective sample, otherwise, the measurement report is considered not to be an effective sample and the sample is discarded.

And 3, if the sample is valid, the network side continuously judges whether other neighbor cells exist in the measurement report corresponding to the sample, wherein the CGI is known in a neighbor cell list, and the signal strength is greater than or equal to a set threshold.

And 4, searching in the parameter configuration information by the network side according to the frequency point and the PCI of the unknown neighbor cell in the effective sample, finding out all cells with the (frequency point + PCI) value equal to that of the unknown neighbor cell (frequency point + PCI), and recording as unknown PCILIst.

And 5, if the unknown PCIList is unique, directly determining that the cell is a real unknown neighbor cell.

And 6, if the unknown PCILIsts are not unique, the network side excludes all cells which are not in the distance search range of the service cell in the unknown PCILIsts according to the service cell ID in the effective sample and the distance search threshold CellCoverDistTh configured on the network manager, the rest is the updated unknown neighbor search set of the unknown PCILIsts, and the true unknown neighbor is in the set.

And 7, initializing a counter queue CellCntList for the unknown PCIList by the network side. The length of this queue is the same as the unwwnpcilist. Namely, each unknown neighboring cell corresponds to a counter. The initial values are all 0.

And 8, traversing each unknown neighbor cell in the unknown PCIList by the network side, judging whether the angle range corresponding to the wave beam of the unknown neighbor cell is overlapped with the angle ranges corresponding to the wave beams of the serving cell and the reference neighbor cell, and if so, adding 1 to a corresponding counter.

And 8.1, assuming that the angle range of the beam of the service cell is [ a1, a2], the angle range of the beam of the unknown neighbor cell is [ theta 1, theta 2], and the included angle between the connection line from the service cell to the unknown neighbor cell and the horizontal direction of the service cell is c. And delta theta is theta 2-theta 1 and represents the width of the unknown neighbor beam.

And 8.2, if the angle range corresponding to the beam of the unknown neighbor cell meets the judgment condition of the table 1, indicating that the angle range corresponding to the beam of the unknown neighbor cell and the angle range corresponding to the beam of the serving cell are overlapped. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

And 8.3, if the reference neighbor cell meeting the condition of the step 3 exists in the current measurement report sample, assuming that the angle range of the beam of the reference neighbor cell is [ a1, a2], the angle range of the beam of the unknown neighbor cell is [ θ 1, θ 2], the included angle between the connecting line from the reference cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, and Δ θ is θ 2- θ 1, which represents the width of the beam of the unknown neighbor cell.

And 8.4, if the beam corresponding angle range of the unknown neighbor cell meets the judgment conditions of the table 1, indicating that the beam corresponding angle range of the unknown neighbor cell and the beam corresponding angle range of the reference neighbor cell are overlapped. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

And 8.5, executing the operation of the step 8.3 and the operation of the step 8.4 to each reference adjacent cell.

Step 8.6, finally obtaining the number cellcntlist (i) of times that the angle range corresponding to the beam of the unknown neighboring cell (assumed to be the ith cell) and the angle ranges corresponding to the beams of the serving cell and the reference neighboring cell overlap.

And 9, after traversing the unknown PCIList, selecting the neighbor cell with the largest value of the CellCntList counter.

Step 9.1, if there is only one neighboring cell corresponding to max (cellcntlist), the CGI corresponding to the cell is the CGI of the unknown neighboring cell.

And 9.2, if a plurality of adjacent cells corresponding to max (cellcntlist) exist, respectively calculating the distances from the adjacent cells to the serving cell by using longitude and latitude information in the parameter configuration information, and selecting the adjacent cell with the closest distance as the most possible unknown adjacent cell, wherein the CGI corresponding to the cell is the CGI of the unknown adjacent cell.

In a scenario two, a Long Term Evolution-New Radio (LTE-NR) dual connection scenario, when an LTE cell needs to add an NR neighbor, the cell discovery method provided in the embodiment of the present invention includes:

step 1, the network side collects a measurement report of the UE, obtains a PCI of the neighboring cell, and determines whether the PCI exists in the neighboring cell table, and if the PCI does not exist in the neighboring cell table, it is an unknown neighboring cell (collectively referred to as an unknown neighboring cell in this scenario for convenience of description) for which the CGI needs to be determined in the method.

And 4, searching in the parameter configuration information by the network side according to the frequency point and the PCI of the unknown adjacent cell in the effective sample. Finding out all cells with the (frequency point + PCI) value equal to that of the unknown neighbor cell (frequency point + PCI), and recording as unbwnPCILIst.

And 6, if the unknown PCILIst is not unique, the network side excludes all cells which are not in the distance search range of the service cell in the unknown PCILIst according to the service cell ID in the effective sample and the distance search threshold CellCoverDistTh configured on the network manager, and the rest is the updated unknown PCILIst. The true unknown neighbor is in the set.

And 7, initializing a counter queue CellCntList for the unknown PCIList by the network side. The length of the queue is the same as that of the unknown PCILIst, namely, each unknown neighbor cell corresponds to a counter. The initial values are all 0.

a. If the serving cell is a directional station cell, then:

in step 8.1, the angle range corresponding to the serving cell direction angle is the angle range of the serving cell, and is assumed to be [ a1, a2], which can be obtained from the parameter configuration information. The angle range of the unknown neighbor cell beam is [ theta 1, theta 2], the included angle between the connection line from the serving cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, and delta theta is theta 2-theta 1, which represents the width of the unknown neighbor cell beam.

And 8.2, if the angle range corresponding to the beam of the unknown neighbor cell meets the judgment conditions of the table 1, indicating that the angle range corresponding to the beam of the unknown neighbor cell and the angle range of the serving cell are overlapped. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

b. If the serving cell is an omni station cell:

step 8.3, the angular range of the serving cell is [0,360 ].

Step 8.4, in this case, both are overlapping regardless of the angular range of the unknown neighbouring cell. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

c. If the reference neighbor cell meeting the condition of the step 3 exists in the current measurement report sample and the reference neighbor cell is an LTE directional station cell, then:

and 8.5, the angle range corresponding to the direction angle of the reference adjacent cell is the angle range of the reference adjacent cell, the assumption is that [ a1, a2], the angle range of the beam of the unknown adjacent cell is [ theta 1, theta 2], and the included angle between the connecting line from the reference cell to the unknown adjacent cell and the horizontal direction of the service cell is c. And delta theta is theta 2-theta 1 and represents the width of the unknown neighbor beam.

And 8.6, if the beam corresponding angle range of the unknown neighbor cell meets the judgment conditions of the table 1, indicating that the beam corresponding angle range of the unknown neighbor cell and the beam corresponding angle range of the reference neighbor cell are overlapped. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

d. If the reference neighbor cell meeting the condition of the step 3 exists in the current measurement report sample and the reference neighbor cell is an LTE omni-directional station cell, then:

step 8.7, the angle range of the reference neighbor is [0,360 ].

Step 8.8, in this case, both are overlapping regardless of the angular range of the unknown neighboring cell. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

e. If the reference neighbor cell meeting the condition of the step 3 exists in the current measurement report sample and the reference neighbor cell is an NR cell, then:

and 8.9, assuming that the angle range of the reference neighbor cell beam is [ a1, a2], the angle range of the unknown neighbor cell beam is [ theta 1, theta 2], and the included angle between the connection line from the reference cell to the unknown neighbor cell and the horizontal direction of the serving cell is c. And delta theta is theta 2-theta 1 and represents the width of the unknown neighbor beam.

And 8.10, if the beam corresponding angle range of the unknown neighbor cell meets the judgment condition of the table 1, indicating that the beam corresponding angle range of the unknown neighbor cell and the beam corresponding angle range of the reference neighbor cell are overlapped. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

And 8.11, judging whether the reference adjacent cell belongs to the conditions c, d or e, and executing the corresponding steps.

Step 8.12, finally obtaining the number cellcntlist (i) of times that the angle range corresponding to the beam of the unknown neighboring cell (assumed to be the ith cell) and the angle ranges corresponding to the beams of the serving cell and the reference neighboring cell overlap.

It should be noted that, since the LTE cell has no concept of beams, the signal coverage is the coverage of the whole cell. While the signal coverage of the NR cell is still the angular range to which its beam corresponds. Therefore, the coverage of the LTE cell needs to be treated as a wide beam.

Scene three, when an NR cell needs to add an LTE neighbor, the cell discovery method provided by the embodiment of the present invention includes:

And 6, if the unknown PCILIsts are not unique, the network side excludes all cells which are not in the distance search range of the service cell in the unknown PCILIsts according to the service cell id in the effective sample and the distance search threshold CellCoverDistTh configured on the network manager, the rest is the updated unknown neighbor cell search set unknown PCILIsts, and the true unknown neighbor cells are in the set.

And 7, initializing a counter queue CellCntList for the unknown PCILIst by the network side, wherein the length of the queue is the same as that of the unknown PCILIst, namely each unknown neighbor cell corresponds to a counter, and the initial value is 0.

a. If the unknown neighbor cell is a directional station:

step 8.1, assuming that the angle range of the beam of the serving cell is [ a1, a2], the angle range of the unknown neighboring cell is the angle range [ θ 1, θ 2] corresponding to the direction angle of the unknown neighboring cell, the included angle between the connection line from the serving cell to the unknown neighboring cell and the horizontal direction of the serving cell is c, and Δ θ is θ 2- θ 1. If the angle range of the unknown neighboring cell meets the judgment condition of table 1, it indicates that the angle range of the unknown neighboring cell and the angle range corresponding to the beam of the serving cell overlap, and a counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

Step 8.2, if the reference neighbor cell meeting the condition in step 3 exists in the current measurement report sample and the reference neighbor cell is an NR cell, assuming that the angle range of the beam of the reference neighbor cell is [ a1, a2], the angle range of the unknown neighbor cell is [ θ 1, θ 2], and the included angle between the connection line from the reference cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, where Δ θ is θ 2- θ 1. If the angle range of the unknown neighboring cell meets the judgment condition of table 1, it indicates that the angle range of the unknown neighboring cell and the angle range corresponding to the beam of the reference cell overlap, and a counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

And 8.3, if the reference neighbor cell meeting the condition in the step 3 exists in the current measurement report sample and the reference neighbor cell is an LTE directional station cell, the angle range of the reference neighbor cell is an angle range corresponding to the direction angle of the reference neighbor cell, assuming that [ a1, a2], the angle range of the unknown neighbor cell is [ θ 1, θ 2], the included angle between the connection line from the reference cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, and Δ θ is θ 2- θ 1. If the angle range of the unknown neighboring cell meets the judgment condition of table 1, it indicates that the angle range of the unknown neighboring cell and the angle range of the reference cell overlap. Then the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith cell).

And 8.4, if the reference neighbor cells meeting the conditions in the step 3 exist in the current measurement report sample and the reference neighbor cells are LTE omni-directional station cells, the reference neighbor cells and the unknown neighbor cells are overlapped regardless of the angle range of the unknown neighbor cells. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

And 8.5, executing the operation of the step 8.2, the step 8.3 or the step 8.4 to each reference adjacent cell.

b. If the unknown neighbor cell is the omni-directional cell, then:

and 8.6, setting the angle range of the unknown adjacent region as 0, 360.

Step 8.7, in this case both have an overlap, regardless of the type of serving cell (NR or LTE). Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

Step 8.8, both the reference neighbourhood, regardless of type (NR or LTE), and whether omni-directional or directional, are overlapping. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

Step 8.9, finally obtaining the number cellcntlist (i) of times that the angle range corresponding to the beam of the unknown neighboring cell (assumed to be the ith cell) and the angle ranges corresponding to the beams of the serving cell and the reference neighboring cell overlap.

Scene four, when an LTE cell needs to add an LTE neighbor, the cell discovery method provided by the embodiment of the present invention includes:

And 2, the network side judges according to the relevant information in the measurement report reported by the UE. If the signal strength of the service cell and the unknown neighbor cell is larger than or equal to the set threshold, the measurement report is considered to be a valid sample, otherwise, the measurement report is considered not to be a valid sample and the sample is discarded.

And 3, if the sample is valid, the network side continuously judges whether other adjacent cells exist in the measurement report corresponding to the sample, wherein the CGI is known in an adjacent cell list, and the signal strength is greater than or equal to a set threshold. If such neighboring cells exist, each neighboring cell is a reference point, and may be used to assist in determining a CGI of an unknown neighboring cell (collectively referred to as a reference neighboring cell in this scenario for convenience of description).

And 4, searching in a parameter configuration table by the network side according to the frequency point and the PCI of the unknown adjacent cell in the effective sample. Finding out all cells with the (frequency point + PCI) value equal to that of the unknown neighbor cell (frequency point + PCI), and recording as unbwnPCILIst.

a. If the unknown neighbor cell is a directional station:

step 8.1, assuming that the angle range of the serving cell beam is [ a1, a2], the angle range of the known neighbor cell is the angle range [ θ 1, θ 2] corresponding to the unknown neighbor cell direction angle, the included angle between the connection line from the serving cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, and Δ θ is θ 2 — θ 1. If the angle range of the unknown neighboring cell meets the judgment condition in table 1, it indicates that the angle range of the unknown neighboring cell and the angle range of the serving cell overlap, and the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is set.

Step 8.2, if a reference neighbor cell meeting the condition in step ③ exists in the current measurement report sample, and the reference neighbor cell is an LTE directional station cell, the angle range of the reference neighbor cell is the angle range corresponding to the direction angle of the reference neighbor cell, and is assumed to be [ a1, a2], the angle range of the unknown neighbor cell is [ θ 1, θ 2], and the included angle between the connection line from the reference cell to the unknown neighbor cell and the horizontal direction of the serving cell is c, Δ θ ═ θ 2- θ 1.

And 8.3, if the reference neighbor cells meeting the conditions in the step 3 exist in the current measurement report sample and the reference neighbor cells are LTE omni-directional station cells, the reference neighbor cells and the unknown neighbor cells are overlapped regardless of the angle range of the unknown neighbor cells. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

And 8.4, performing the operation of ii, iii or iv on each reference neighbor.

b. If the unknown neighbor cell is the omni-directional cell, then:

and 8.5, setting the angle range of the unknown adjacent region as 0, 360.

Step 8.6, in this case, there is an overlap of the serving cell, whether it is a directional or an omni-directional station. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

Step 8.7, both the reference neighbor and the omni-directional station have an overlap. Therefore, the counter cellcntlist (i) ═ cellcntlist (i) +1 corresponding to the unknown neighboring cell (assumed to be the ith) is directly added.

And 8.8, finally obtaining the times CellCntList (i) that the angle range of the unknown neighboring cell (assumed to be the ith) and the angle ranges of the serving cell and the reference neighboring cell have overlapping.

And 9.2, if a plurality of adjacent cells corresponding to max (cellcntlist) exist, respectively calculating the distances from the adjacent cells to the serving cell by using longitude and latitude information in the parameter configuration table, and selecting the adjacent cell with the closest distance as the most possible unknown adjacent cell, wherein the CGI corresponding to the cell is the CGI of the unknown adjacent cell.

An embodiment of the present invention provides a network node, as shown in fig. 7, where the network node 2 includes:

an obtaining module 21, configured to obtain a PCI and a frequency point of a first cell from a measurement report reported by a UE; the first cell is a cell which does not exist in a neighbor relation table pre-stored by the network node.

The searching module 22 is configured to search, in the pre-stored parameter configuration information, a cell that is located within a preset search range, has the same PCI as the PCI of the first cell, and has the same frequency point as the first cell, as a second cell.

And the processing module 23 is configured to determine that the second cell is an unknown cell if the second cell is unique, and obtain a CGI of the unknown cell from the parameter configuration information.

Optionally, the search module 22 is specifically configured to:

Optionally, if the second cell is not unique, the processing module 23 is further configured to:

Optionally, the processing module 23 is further specifically configured to:

And if the third cell is unique, determining the third cell as an unknown cell.

Optionally, the processing module 23 is further specifically configured to:

Optionally, if the third cell is not unique, the processing module 23 is further configured to:

acquiring the longitude and latitude of the service cell and each third cell from the parameter configuration information;

calculating the distance between each third cell and the service cell according to the obtained longitude and latitude;

Optionally, the processing module 23 is further configured to add the correspondence between the CGI, the PCI, and the frequency point of the unknown cell to the neighboring cell relation table.

According to the network node provided by the embodiment of the invention, the CGI of the unknown cell is obtained by the network node according to the parameter configuration information and the measurement report reported by the UE, so that the CGI of the unknown cell is obtained in a non-air interface mode, the increase of the call drop rate is avoided, and the reduction of the network performance is prevented.

In practical applications, the obtaining module 21, the searching module 22 and the Processing module 21 may be implemented by a Central Processing Unit (CPU), a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like located in a network node.

The embodiment of the present invention further provides a network node, which includes a memory and a processor, where the memory stores the following instructions that can be executed by the processor:

obtaining the PCI and the frequency point of a first cell from a measurement report reported by UE; the first cell is a cell which does not exist in a neighbor relation table pre-stored by the network node.

And searching a cell which is located in a preset search range, has the same PCI as that of the first cell and has the same frequency point as that of the first cell in the prestored parameter configuration information, and using the cell as a second cell.

And if the second cell is unique, determining the second cell as an unknown cell, and acquiring the CGI of the unknown cell from the parameter configuration information.

Optionally, the memory has embodied therein the following instructions executable by the processor.

Optionally, if the second cell is not unique, the memory further has stored therein the following instructions executable by the processor:

Optionally, the memory further stores the following instructions executable by the processor:

And if the third cell is unique, determining the third cell as an unknown cell.

Optionally, if the third cell is not unique, the memory further has stored therein the following instructions executable by the processor:

Optionally, the computer-executable instructions are specifically configured to perform the steps of:

Optionally, if the second cell is not unique, the computer-executable instructions are further for performing the steps of:

Optionally, the computer-executable instructions are further specifically configured to perform the steps of:

And if the third cell is unique, determining the third cell as an unknown cell.

Optionally, if the third cell is not unique, the computer-executable instructions are further specifically configured to perform the steps of:

Optionally, the computer-executable instructions are further for performing the steps of:

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A cell discovery method, comprising:

a network node acquires a Physical Cell Identifier (PCI) and a frequency point of a first cell from a measurement report reported by User Equipment (UE); wherein the first cell is a cell that does not exist in a neighbor relation table pre-stored by the network node;

and if the second cell is unique, determining that the second cell is an unknown cell, and acquiring a global cell identifier (CGI) of the unknown cell from the parameter configuration information.

2. The method of claim 1, wherein the searching for the cell having the same PCI as the PCI of the first cell and the same frequency point as the first cell in the pre-stored parameter configuration information includes:

obtaining signal strengths of a serving cell and the first cell from the measurement report;

judging whether the signal intensity of the serving cell is greater than a first preset threshold value or not, and whether the signal intensity of the first cell is greater than a second preset threshold value or not;

and if the signal intensity of the service cell is not less than the first preset threshold value and the signal intensity of the first cell is not less than the second preset threshold value, searching the cell which is located in the preset search range, has the same PCI as the PCI of the first cell and has the same frequency point as the frequency point of the first cell in the parameter configuration information.

3. The cell discovery method of claim 1, further comprising, if the second cell is not unique:

searching a cell which exists in the neighbor cell relation and has signal strength greater than a third preset threshold value according to the measurement report, and using the cell as a reference cell;

acquiring beam information of the second cell, the reference cell and a serving cell from the measurement report;

and determining the unknown cell in the second cell according to the beam information and the parameter configuration information of the second cell, the reference cell, the serving cell, and the CGI of the unknown cell from the parameter configuration information.

4. The cell discovery method of claim 3, wherein said determining the unknown cell in the second cell according to the beam information and the parameter configuration information of the second cell, the reference cell, the serving cell comprises:

calculating the number of overlapping of the beam of each second cell and the beam of the target cell according to the beam information of the second cell, the reference cell, the serving cell and the parameter configuration information; wherein the target cell comprises: the serving cell and the reference cell;

selecting a cell with the largest number of overlapped wave beams of the wave beams and the target cell as a third cell according to the obtained number of overlapped wave beams;

and if the third cell is unique, determining that the third cell is the unknown cell.

5. The cell discovery method of claim 4, wherein calculating the number of overlapping beams of each second cell with the beam of the target cell according to the beam information and the parameter configuration information of the second cell, the reference cell, the serving cell comprises:

judging whether the beam of the ith second cell is overlapped with the beam of the jth target cell according to the beam information of the second cell, the reference cell, the serving cell and the parameter configuration information; wherein i is 1 … M, j is 1 … N, M is the number of the second cells, and N is the number of the target cells;

6. The cell discovery method of claim 5, wherein said determining whether the beam of the ith second cell overlaps with the beam of the jth target cell according to the beam information of the second cell, the reference cell, the serving cell, and the parameter configuration information comprises:

respectively acquiring the direction angle and the longitude and latitude of the ith second cell and the jth target cell from the parameter configuration information;

calculating an angle range corresponding to beams of the ith second cell and the jth target cell according to the direction angles of the ith second cell and the jth target cell and the beam information of the ith second cell and the jth target cell;

calculating an included angle between a connecting line from the ith second cell to the jth target cell and the jth target cell in the horizontal direction according to the longitude and latitude of the ith second cell and the jth target cell;

and judging whether the beam of the ith second cell is overlapped with the beam of the jth target cell according to the angle range corresponding to the beam of the ith second cell, the angle range corresponding to the beam of the jth target cell and the obtained included angle.

7. The cell discovery method of claim 4, further comprising, if said third cell is not unique:

and acquiring a third cell with the shortest distance to the service cell as the unknown cell.

8. The cell discovery method of claim 1, wherein said predetermined search range comprises: and taking the serving cell as a center, and taking the distance from the signal propagation of the serving cell to the intensity attenuation to a third preset threshold value as a radius to form a coverage range.

9. The cell discovery method according to claim 1, further comprising, after said obtaining the CGI of the unknown cell:

10. A network node, comprising:

11. A network node, comprising: a processor and a memory, wherein the memory has stored therein the following instructions executable by the processor:

12. A computer-readable storage medium having stored thereon computer-executable instructions for performing the steps of: