CN114079929B

CN114079929B - Cell coverage adjusting method and wireless access network system

Info

Publication number: CN114079929B
Application number: CN202010849004.2A
Authority: CN
Inventors: 周徐; 方东旭; 柏田田; 李俊; 文冰松; 谢陶; 王丽秋
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Chongqing Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Chongqing Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2023-08-15
Anticipated expiration: 2040-08-21
Also published as: CN114079929A

Abstract

The embodiment of the invention relates to the technical field of wireless communication, and discloses a cell coverage adjusting method and a system, wherein the method comprises the following steps: setting the antenna mechanical downtilt angle of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the wireless radio frequency of the first NR cell and the first LTE cell to be smaller than or equal to a preset value; setting the antenna mechanical azimuth angle of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna mechanical azimuth angle of the wireless radio frequency of the first NR cell and the first LTE cell to be smaller than or equal to a preset value; setting the antenna height of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna height of the wireless radio frequency of the first NR cell and the antenna height of the first LTE cell to be smaller than or equal to a preset value. Through the mode, the embodiment of the invention realizes that the coverage area of the first LTE cell is consistent with that of the first NR cell, thereby achieving the aim of switching and synchronizing the LTE cell and the NR cell.

Description

Cell coverage adjusting method and wireless access network system

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to a cell coverage adjusting method and a wireless access network system.

Background

In the process of 5G communication network construction, considering evolution of an operator network and minimizing excessive large-scale investment, in the early stage of network construction, a network deployment mode of the 5G network generally adopts a NSA (non-stand alone networking) mode. The NSA networking mode uses EPC (Evolved Packet Core, evolved packet core network) +lte (Long Term Evolution, long term evolution access network) +nr (New Radio, new air interface) in a relatively large number of ways, that is, a non-independent networking mode mainly comprising a 4G core network and a 4G Radio access network, and uses a 4G LTE site as an anchor point to provide 5G services. In this mode, a 5G User Equipment (UE) based on the dual connectivity technology (DC, dual Connectivity) will connect the 4GLTE network and the 5GNR network simultaneously.

The characteristics of the current 4G/5G dual connectivity of the 5G user puts higher requirements on mobility management of the access network: as the UE location moves, it is imperative to face handovers between different 4G LTE cells and handovers between different 5G NR cells.

In carrying out embodiments of the present invention, the inventors found that: because the LTE cell switching band and the NR cell switching band connected by the UE are different, the LTE cell switching and the NR cell switching of the UE are often asynchronous in switching, so that the user experiences two rate dip, and the 5G user experience is affected.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a cell coverage adjustment method and a radio access network system, which are used to solve the problem in the prior art that the handover between an LTE cell and an NR cell connected by a UE is not synchronous.

According to an aspect of an embodiment of the present invention, there is provided a cell coverage adjustment method, where the cell includes a first LTE cell and a first NR cell, and the first LTE cell and the first NR cell are a first cell pair, the method includes:

setting the antenna mechanical downtilt angle of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the wireless radio frequency of the first NR cell and the antenna mechanical downtilt angle of the wireless radio frequency of the first LTE cell to be smaller than or equal to a preset value;

setting the antenna mechanical azimuth angle of the first LTE cell radio frequency within a preset range, and adjusting the absolute value of the difference between the antenna mechanical azimuth angle of the first NR cell radio frequency and the antenna mechanical azimuth angle of the first LTE cell radio frequency to be smaller than or equal to a preset value; and

Setting the antenna height of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna height of the wireless radio frequency of the first NR cell and the antenna height of the wireless radio frequency of the first LTE cell to be smaller than or equal to a preset value; so that the coverage areas of the first LTE cell and the first NR cell are consistent.

In an optional manner, the setting the antenna mechanical downtilt angle of the radio frequency of the first LTE cell to be within a predetermined range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the radio frequency of the first NR cell and the antenna mechanical downtilt angle of the radio frequency of the first LTE cell to be less than or equal to a preset value includes:

setting the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees;

the setting the antenna mechanical azimuth angle of the first LTE cell radio frequency within a predetermined range, and adjusting the absolute value of the difference between the antenna mechanical azimuth angle of the first NR cell radio frequency and the antenna mechanical azimuth angle of the first LTE cell radio frequency to be less than or equal to a preset value includes:

setting the vertical lobe width of a macro station antenna of the wireless radio frequency of the first LTE cell to be 5-8 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the macro station antenna of the wireless radio frequency of the first NR cell and the vertical lobe width of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 degree;

The setting the antenna height of the first LTE cell radio frequency within a predetermined range, and adjusting the absolute value of the difference between the antenna height of the first NR cell radio frequency and the antenna height of the first LTE cell radio frequency to be less than or equal to a preset value includes:

setting the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the macro station antenna of the wireless radio frequency of the first NR cell and the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 meter.

setting the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees;

Setting the vertical lobe width of the MM antenna of the wireless radio frequency of the first LTE cell to be 8-10 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the MM antenna of the wireless radio frequency of the first NR cell and the vertical lobe width of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 degree;

setting the height of the MM antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the MM antenna of the wireless radio frequency of the first NR cell and the height of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 meters.

In an alternative, the method further comprises:

and according to the coverage range of the first LTE cell and the coverage scene requirement of the first NR cell, selecting a mode Pattern configuration from a scene configuration table to adjust the horizontal wave width and the vertical wave width of the large-scale MIMO antenna of the first NR cell so as to enable the coverage range of the first NR cell to be consistent with the coverage range of the first LTE cell.

In an alternative, the method further comprises:

and the NR base station to which the first NR cell belongs transmits broadcast beams in a polling mode, and the UE measures a plurality of broadcast beams transmitted by the NR base station at a plurality of times and selects one broadcast beam with better signal quality from the plurality of broadcast beams as a broadcast channel.

In an alternative, the method further comprises:

and the NR base station selects a control wave beam with stronger reference signal receiving power intensity as a control channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

In an alternative, the method further comprises:

and the NR base station selects a service wave beam with stronger reference signal receiving power intensity as a service channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

In an alternative, the method further comprises:

the first cell pair is a second cell pair, the second cell pair comprises a second LTE cell and a second NR cell, the first LTE cell is adjacent to the second LTE cell, the first NR cell is adjacent to the second NR cell, and the UE is connected with the second LTE cell and the second NR cell at the same time;

When the UE is switched from the second cell pair to the first cell pair, the UE is switched from a second LTE cell to a first LTE cell at a first switching time and is switched from a second NR cell to a first NR cell at a second switching time;

if the second switching time is longer than the first switching time, reducing CIO parameters of the second LTE cell and the first LTE cell so that the absolute value of the difference between the second switching time and the first switching time is smaller than or equal to a preset value;

if the first switching time is longer than the second switching time, increasing CIO parameters of the second LTE cell and the first LTE cell so that the absolute value of the difference between the first switching time and the second switching time is smaller than or equal to a preset value.

In an alternative, the method further comprises:

If the second switching time is longer than the first switching time, increasing CIO parameters of the second NR cell and the first NR cell so that the absolute value of the difference between the second switching time and the first switching time is smaller than or equal to a preset value;

and if the first switching time is longer than the second switching time, reducing CIO parameters of the second NR cell and the first NR cell so that the absolute value of the difference between the first switching time and the second switching time is smaller than or equal to a preset value.

According to another aspect of an embodiment of the present invention, there is provided a radio access network system including:

a first station having a first LTE cell; a second station having a first NR cell; the first LTE cell and the first NR cell are a first cell pair;

the antenna mechanical downward inclination angle of the first station wireless radio frequency is set in a preset range, and the absolute value of the difference between the antenna mechanical downward inclination angle of the second station wireless radio frequency and the antenna mechanical downward inclination angle of the first station wireless radio frequency is smaller than or equal to a preset value;

the antenna mechanical azimuth angle of the first station wireless radio frequency is set in a preset range, and the absolute value of the difference between the antenna mechanical azimuth angle of the second station wireless radio frequency and the antenna mechanical azimuth angle of the first station wireless radio frequency is smaller than or equal to a preset value; and

The antenna height of the first station wireless radio frequency is set in a preset range, and the absolute value of the difference between the antenna height of the second station wireless radio frequency and the antenna height of the first station wireless radio frequency is smaller than or equal to a preset value; so that the coverage areas of the first LTE cell and the first NR cell are consistent.

According to the embodiment of the invention, for the situation that the switching between the LTE cell and the NR cell is asynchronous, through the optimized adjustment of the wireless radio frequency of the first cell, the wireless radio frequency parameters such as the mechanical downtilt angle, the mechanical azimuth angle, the antenna height and the like of the wireless radio frequency of the first LTE cell and the first NR cell are adjusted to be consistent, so that the change of the switching band of the first LTE cell and the first NR cell is controlled, the coverage range of the first LTE cell and the coverage range of the first NR cell are consistent, and the aim of switching synchronization of the LTE cell and the NR cell is achieved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present invention can be more clearly understood, and the following specific embodiments of the present invention are given for clarity and understanding.

Drawings

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

fig. 1 is a schematic diagram of a scenario in which a UE is switched in a moving process in NSA networking mode according to an embodiment of the present invention;

fig. 2 shows a flowchart of a cell coverage adjustment method according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a radio access network system according to an embodiment of the present invention.

Detailed Description

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

The embodiment of the invention is mainly applied to the 5G network scene of NSA networking mode, and when the 5G user terminal accesses the wireless network to carry out 5G service, the 4G network and the 5G network are simultaneously connected. Specifically, the 5G UE is simultaneously connected with a 4G LTE base station and a 5G NR base station, wherein the LTE base station is an LTE base station to which a UE resident cell belongs, and the LTE base station is set as a master base station (MeNB); and the NR base station is the NR base station configured by the MeNB to the UE through RRC connection signaling, and the NR base station is set as a secondary base station (SgNB). The RRC is Radio Resource Control, radio resource control.

The 4G LTE Cell (LTE Cell for short) connected by the user terminal UE is a Primary Cell (Pcell) under the MeNB, and is a Cell where the NSA DC user terminal resides; the 5G NR cell (abbreviated as NR cell) connected by the UE is a primary cell (PSCell, primary Secondary Cell) under the SgNB, and is a primary cell configured by the MeNB to the NSA DC terminal on the SgNB through RRC connection signaling, where the PSCell remains active once the configuration is successful. The LTE cell and the NR cell connected by the UE are a cell pair.

In the embodiment of the invention, the switching refers to a process of judging whether to transfer the original used channel to a more suitable channel for information transmission or not through the distance between the mobile station and the base station, the quality of the channel, the capacity of the base station and other information when the mobile station, namely the UE, performs information transmission with the base station. I.e. a procedure for transferring the UE from one LTE cell or NR cell to another LTE cell or NR cell depending on the distance of the UE from the base station, the quality of the wireless network, etc. Since the UE connects the LTE cell and the NR cell at the same time, in NSA networking mode, the above-mentioned handover procedure is that the UE is handed over from one cell pair to another cell pair.

The switching in NSA networking mode is mainly based on the coverage and channel quality of the cell, and the flow includes two aspects, namely the switching flow of the LTE cell and the changing flow of the 5G NR cell. Because the 4G LTE base station (eNB, eNodeB) or the 5G NR base station (gNB, gNodeB) does not know the position and the wireless quality condition of the UE, the wireless quality information related to the UE reporting needs to be controlled to judge, and the mode of reporting the wireless quality information by the UE comprises two modes of periodic reporting and event reporting. In general, the gNB/eNB monitors the wireless quality change critical point of the UE in an event measurement report mode, when the eNB receives a measurement or switching event report, a switching command is issued to the UE, after receiving the switching command, the UE interrupts interaction with a source cell, switches to a new target cell according to the switching command requirement, and notifies the target cell through signaling interaction so as to complete the whole switching process.

The switching process under NSA architecture relates to interaction between gNB and eNB, PCell and PSCell changing process based on NSA networking are consistent in involved links, for example, in the changing process of PSCell, a measurement control issuing link describes a measurement control message issued by gNodeB to UE, a measurement report reporting link describes a measurement report reported by UE to gNodeB, a changing judging link describes whether gNodeB carries out switching according to measurement report judgment, a changing preparation link describes master station eNodeB judges whether secondary station gNodeB is ready to succeed or not, if so, changing execution can be issued, and finally, a changing execution link describes that UE carries out PSCell changing and result feedback.

Switching between the PCell and the PSCell can be specifically classified into intra-station switching and inter-station switching according to whether the source cell and the target cell before and after switching belong to the same base station; the switching of the PCell and the PSCell can be divided into the same frequency switching and different frequency switching according to whether the frequencies of the cells before and after the switching are the same.

Based on the above description about handover in NSA networking mode, the handover policies of the 4G LTE network and the 5G NR network are independent from each other, and the two networks respectively determine and execute handover changes of each cell based on coverage and radio quality. Fig. 1 is a schematic diagram of a scenario in which a UE is switched in a moving process in NSA networking mode, as shown in fig. 1, as the UE location moves, the UE is switched from one cell pair to another cell pair, and the following three situations can be classified:

Scene a: LTE cell handover, NR cell is unchanged. That is, the LTE cell to which the UE is connected is switched from LTE cell 2 to LTE cell 1, but the NR cell to which it is connected is not changed, but is still NR cell 2.

Scene b: the LTE cell is unchanged and the NR cell is handed over. That is, the NR cell connected to the UE is switched from NR cell 2 to NR cell 1, and the LTE cell connected to the NR cell is not changed and is still LTE cell 1.

Scene c: the LTE cell is handed over simultaneously with the NR cell. That is, the LTE cell to which the UE is connected is handed over from LTE cell 1 to LTE cell 3, while the NR cell to which it is connected is handed over from NR cell 1 to NR cell 3.

In order to avoid overlarge difference of front-back switching time of an LTE cell and an NR cell in the moving process of the UE, two rate sudden drops occur, and the speed stability in the moving process of the UE is ensured, the switching synchronization of the LTE cell and the NR cell is needed, so that the simultaneous switching proportion of a scene c is improved by optimizing and adjusting the coverage area of the cell. In the embodiment of the invention, setting the switching time of the LTE cell as the first switching time, setting the switching time of the NR cell as the second switching time, and switching synchronization of the LTE cell and the NR cell means that: the absolute value of the difference between the first switching time and the second switching time is less than or equal to t seconds, preferably t=5; otherwise, the LTE cell and NR cell handover are not synchronized. As shown in fig. 1, a scenario c of handover from a first cell to a third cell pair is a case of synchronization of LTE cell and NR cell handover; however, for scenario a and scenario b of handover from the second cell pair to the first cell pair, the LTE cell and NR cell handover bands are different, and assuming that the absolute value of the difference between the handover time of scenario a from LTE cell 2 to LTE cell 1 and the handover time of scenario b from NR cell 2 to NR cell 1 is > 5 seconds, the handover from the second cell pair to the first cell pair is an LTE cell and NR cell handover unsynchronized case.

Fig. 2 shows a flowchart of a cell coverage adjustment method according to an embodiment of the present invention. The cell coverage adjustment method provided by the embodiment of the invention is generally implemented on the wireless side of the communication network. The present embodiment is described taking a scenario in which the UE shown in fig. 1 is switched from a second cell pair to a first cell pair as an example, that is, the UE is switched from the second cell pair to the first cell pair, the second cell pair includes a second LTE cell and a second NR cell, the first cell pair includes a first LTE cell and a first NR cell, the first LTE cell is adjacent to the second LTE cell, the first NR cell is adjacent to the second NR cell, the UE is simultaneously connected to the second LTE cell and the second NR cell, the UE is switched from the second LTE cell to the first LTE cell at a first switching time, and is switched from the second NR cell to the first NR cell at a second switching time. The adjustment of the cell coverage of other handover unsynchronized case cell pairs is similar. The first LTE cell is LTE cell 1 shown in fig. 1, the first NR cell is NR cell 1 shown in fig. 1, the second LTE cell is LTE cell 2 shown in fig. 1, and the second NR cell is NR cell 2 shown in fig. 1.

As shown in fig. 2, the method comprises the steps of:

Step 210: setting the antenna mechanical downtilt angle of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the wireless radio frequency of the first NR cell and the antenna mechanical downtilt angle of the wireless radio frequency of the first LTE cell to be smaller than or equal to a preset value. The first LTE cell and the first NR cell are a first cell pair.

When coverage optimization adjustment is performed on the 4G and 5G wireless networks, a good Radio Frequency (RF) structure is the basis of network optimization. In general, the number and scale of 4G LTE base stations serving as anchor sites are larger than those of 5G NR base stations, so that an anchor signal is necessarily present in a place where 5G network coverage is ensured, and thus, the 4G LTE network and the 5G NR network form two networks with continuous coverage.

Because there is usually a large difference between the 4G and 5G antenna positions, in order to obtain better coverage, engineering parameters such as the mechanical downtilt angle and the like need to be adjusted through RF optimization to obtain better network experience.

In this embodiment, RF optimization refers to changing the coverage area and strength of the antenna by adjusting parameters such as the mechanical downtilt angle, the mechanical azimuth angle, and the height of the 4G LTE base station and the 5G NR base station antenna, and controlling the change of the cell switching band under the base station, so that the coverage areas of the LTE cell and the NR cell are as consistent as possible, thereby achieving the purpose of switching synchronization between the LTE cell and the NR cell.

When the RF parameters of the LTE cell and the NR cell are inconsistent, the situation of asynchronous switching can occur in a high probability, and the coverage areas of the LTE cell or the NR cell are kept consistent as much as possible by adjusting the parameters such as the mechanical downtilt angle, the mechanical azimuth angle and the like of the base station RF antenna to which the LTE cell or the NR cell belongs.

Since the 4G wireless network is an existing network, it is preferable that the overall principle of RF optimization adjustment is to keep the 5G NR network coverage as consistent as possible with the 4G LTE network coverage without shrinking.

In step 210, the adjustment of the RF antenna mechanical downtilt angle of the first LTE cell is specifically implemented by adjusting the antenna mechanical downtilt angle of the LTE base station to which the first LTE cell belongs; the adjustment of the RF antenna mechanical downtilt of the first NR cell is specifically achieved by adjusting the antenna mechanical downtilt of the NR base station to which the first NR cell belongs.

Preferably, before step 210, the cell coverage adjustment method further includes:

step 201: and acquiring information of an LTE base station to which a first LTE cell belongs and an NR base station to which a first NR cell belongs, and acquiring industrial parameter data of the LTE base station and the NR base station.

The working parameter data comprise various parameter information of the RF antenna of each base station, such as antenna height, mechanical downtilt angle, mechanical azimuth angle, distance between the coverage area edge and the base station, digital downtilt angle and the like.

The collected information can also comprise data such as traffic statistics, performance indexes and the like of the LTE base station and the NR base station. Specifically, in a certain test evaluation range, information of all LTE base stations and NR base stations can be collected at one time; the information of the base station to be adjusted can also be obtained when the cell switching is not synchronous.

Step 202: and in a certain test evaluation range, testing and evaluating the switching process of each cell pair, and finding that the UE is switched from the second cell pair to the first cell pair and is not synchronous.

Specifically, the test evaluation mainly uses a test terminal to analyze and discover the area, the road section and the corresponding site which need to be optimally adjusted in the modes of road test and the like. If the UE is found to be switched from the second cell pair to the first cell pair, the absolute value of the difference between the first switching time and the second switching time is larger than t seconds, the second cell pair is considered to be switched to the first cell pair to be out of synchronization, and the cell coverage of the first cell pair needs to be adjusted.

Step 201 and step 202 are optional steps, and through the preliminary information acquisition and test evaluation, the cell pairs needing to be adjusted can be accurately found, site engineering parameter data can be obtained more quickly, and the time for optimizing and adjusting is shortened. Of course, the RF parameters of the site may be directly adjusted without information collection and test evaluation.

Step 220: setting the antenna mechanical azimuth angle of the first LTE cell radio frequency within a preset range, and adjusting the absolute value of the difference between the antenna mechanical azimuth angle of the first NR cell radio frequency and the antenna mechanical azimuth angle of the first LTE cell radio frequency to be smaller than or equal to a preset value.

Specifically, in step 220, the adjustment of the RF antenna mechanical azimuth angle of the first LTE cell is implemented by adjusting the antenna mechanical azimuth angle of the LTE base station to which the first LTE cell belongs; the adjustment of the RF antenna mechanical azimuth angle for the first NR cell is achieved by adjusting the antenna mechanical azimuth angle of the NR base station to which the first NR cell belongs.

Step 230: setting the antenna height of the wireless radio frequency of the first LTE cell within a preset range, and adjusting the absolute value of the difference between the antenna height of the wireless radio frequency of the first NR cell and the antenna height of the wireless radio frequency of the first LTE cell to be smaller than or equal to a preset value; so that the coverage areas of the first LTE cell and the first NR cell are consistent.

Specifically, in step 230, the adjustment of the RF antenna height of the first LTE cell is achieved by adjusting the antenna height of the LTE base station to which the first LTE cell belongs; the adjustment of the RF antenna height for the first NR cell is achieved by adjusting the antenna height of the NR base station to which the first NR cell belongs.

The foregoing steps 210 to 230 are schemes for optimizing and adjusting the cell RF in the cell coverage area adjustment method provided by the embodiment of the present invention, and since the antennas of the base station are classified into two types, namely, macro station antennas and MM (Multiple Input Multiple Output ) antennas, the following description is given for the foregoing optimizing and adjusting the cell RF in two embodiments:

in a first embodiment, the macro station antenna is RF optimized for adjustment.

In this embodiment, the antenna types of the LTE base station to which the first LTE cell belongs and the NR base station to which the first NR cell belongs are the macro station antennas. The step 210 specifically includes:

step 211: setting the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees.

Preferably, the mechanical downtilt angle α1 of the macro station antenna of the first LTE cell RF and the mechanical downtilt angle α2 of the macro station antenna of the first NR cell RF may be set to 10 °.

The step 220 specifically includes:

step 221: setting the vertical lobe width of the macro station antenna of the radio frequency of the first LTE cell to be 5-8 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the macro station antenna of the radio frequency of the first NR cell and the vertical lobe width of the macro station antenna of the radio frequency of the first LTE cell to be less than or equal to 1 degree.

Preferably, the vertical lobe width β1 of the macro station antenna of the first LTE cell RF and the vertical lobe width β2 of the macro station antenna of the first NR cell RF may be set to 6.5 °.

The step 230 specifically includes:

step 231: setting the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the macro station antenna of the wireless radio frequency of the first NR cell and the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 meter.

Preferably, the macro antenna height H1 of the first LTE cell RF and the macro antenna height H2 of the first NR cell RF may be set to 20 meters.

In the second embodiment, the RF of the MM antenna is optimally adjusted.

In this embodiment, the antenna types of the LTE base station to which the first LTE cell belongs and the NR base station to which the first NR cell belongs are the same MM antennas. The step 210 specifically includes:

step 212: setting the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees.

Preferably, the mechanical downtilt angle M-Tilt1 of the MM antenna of the first LTE cell RF and the mechanical downtilt angle M-Tilt2 of the MM antenna of the first NR cell RF may be set to 10 °.

The step 220 specifically includes:

step 222: setting the vertical lobe width of the MM antenna of the wireless radio frequency of the first LTE cell to be 8-10 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the MM antenna of the wireless radio frequency of the first NR cell and the vertical lobe width of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 degree.

Preferably, the MM antenna vertical lobe width β3 of the first LTE cell RF and the MM antenna vertical lobe width β4 of the first NR cell RF may be set to 8 °.

The step 230 specifically includes:

step 232: setting the height of the MM antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the MM antenna of the wireless radio frequency of the first NR cell and the height of the MM antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 meters.

Preferably, the MM antenna height H3 of the first LTE cell RF may be set to 20 meters, and the MM antenna height H4 of the first NR cell RF may be set to 22 meters.

Optionally, the MM antenna may be further provided with a digital downtilt angle thereof to control the total downtilt angle of the MM antenna in combination with the mechanical downtilt angle. The second embodiment may further include:

step 241: setting the MM antenna digital downtilt angle of the wireless radio frequency of the first LTE cell to be 0.5-1.5 degrees, and adjusting the absolute value of the difference between the MM antenna digital downtilt angle of the wireless radio frequency of the first NR cell and the MM digital downtilt angle of the wireless radio frequency of the first LTE cell to be less than or equal to 0.2 degrees.

Preferably, the MM antenna digital downtilt angle E-Tilt1 of the first LTE cell RF and the MM antenna digital downtilt angle E-Tilt2 of the first NR cell RF may be set to 1 °.

The above-described optimal adjustment scheme for cell RF may further include:

step 240: setting the distance between the coverage area edge of the radio frequency of the first LTE cell and an LTE base station within a preset range, adjusting the distance between the coverage area edge of the radio frequency of the first NR cell and the NR base station, and the absolute value of the difference between the coverage area edge of the wireless radio frequency of the first LTE cell and the distance between the coverage area edge of the wireless radio frequency of the first LTE cell and the LTE base station is smaller than or equal to a preset value.

Specifically, the distance D1 between the coverage area edge of the first LTE cell RF and the LTE base station is set to 160 meters to 180 meters, and the absolute value of the difference between the coverage area edge of the first NR cell RF and the distances D2 and D1 between the coverage area edge of the first NR cell RF and the NR base station is adjusted to be 10 meters or less.

Preferably, the distance D1 between the coverage area edge of the first LTE cell RF and the LTE base station may be set to 170 meters, and the distance D2 between the coverage area edge of the first NR cell RF and the NR base station may be set to 162.9 meters.

Typically, the antennas of one base station are macro station antennas or MM antennas, but it is also possible that one base station has two types of antennas, and then macro station antennas and MM antenna parameters of the LTE cell and the NR cell RF need to be adjusted according to the first and second embodiments.

The above-mentioned optimization adjustment to RF may be adjustment to a 4g &5g dual mode AAU (Active Antenna Unit ) with antenna feedback, or adjustment to other antenna feedback conditions, and in the dual mode AAU case, the coverage of the LTE cell and the NR cell may be more consistent by further improving the deep coverage capability of the cell with the additional gain of the AAU.

For the situation that the UE is switched from the second cell pair to the first cell pair and the switching between the LTE cell and the NR cell is not synchronous, the RF parameters of the first LTE cell and the RF parameters of the first NR cell are set to be consistent through the optimized adjustment of the RF of the first cell, so that the change of a switching band of the first LTE cell and the first NR cell is controlled, the coverage range of the first LTE cell and the coverage range of the first NR cell are basically consistent, and the aim of switching synchronization of the LTE cell and the NR cell is fulfilled. On the basis of adjusting the mechanical downtilt angle, the mechanical azimuth angle and the height of the cell RF antenna, the distance parameter between the coverage area edge of the cell RF and the base station can be further adjusted, so that the coverage area of the first LTE cell is more matched with the coverage area of the first NR cell. For the MM antenna, the digital downtilt parameters can be further adjusted so as to optimize the coverage range matching degree of the first LTE cell and the first NR cell, and further improve the switching synchronism of the LTE cell and the NR cell.

The above scheme is to optimally adjust the RF parameters of the first cell pair (i.e. the target cell pair after handover), and further optimally adjust the RF parameters of the second cell pair (i.e. the source cell pair before handover), so as to further improve the handover synchronism of the UE from the second cell pair to the first cell pair for LTE cell and NR cell. The specific method is similar to the above-mentioned RF optimization adjustment for the first cell pair, and will not be repeated.

After the RF optimization adjustment is performed on the first cell, the adjustment result can be verified and analyzed, and specifically, whether the expected switching synchronization effect is achieved or not can be analyzed by combining the road test result and the telephone traffic statistical data. If the conditions of the LTE cell and the NR cell handover are still asynchronous, antenna mode (Pattern) configuration adjustment can be further performed on the NR cell coverage in the first cell pair. Of course, antenna Pattern configuration adjustment can also be directly performed on the NR cells without verification analysis, so as to further improve the coverage matching degree of the LTE cells and the NR cells.

The cell coverage adjusting method provided by the embodiment of the invention can further comprise the following steps:

step 250: and according to the coverage range of the first LTE cell and the coverage scene requirement of the first NR cell, selecting a mode Pattern configuration from a scene configuration table to adjust the horizontal wave width and the vertical wave width of the large-scale MIMO antenna of the first NR cell so as to enable the coverage range of the first NR cell to be consistent with the coverage range of the first LTE cell.

Because the 5G network adopts a Massive MIMO (multiple input multiple output) antenna, the Massive antenna array is configured to serve a plurality of users in a coverage area simultaneously, thereby improving the space division multiplexing capability and the beam forming capability of multiple users and the capability of suppressing interference and greatly improving the overall utilization rate of wireless spectrum resources. And matching different Massive MIMO antenna weights according to different coverage scenes, and obtaining an optimal weight combination through various combinations. Parameters with adjustable Massive MIMO antenna weight values include horizontal wave width, vertical wave width and the like, and one combination of the parameters is Pattern. The horizontal bandwidth and the vertical bandwidth may also be referred to as digital azimuth parameters of the NR cell Massive MIMO antenna. Table 1 is an example of a passive MIMO antenna Pattern scene configuration table, and flexible and various configurations can be performed in a practical application scene.

TABLE 1

According to actual coverage scene requirements (such as road and bridge scenes, square scenes, building scenes, market scenes and the like), referring to the supporting capability of the radio frequency unit, the horizontal wave width and the vertical wave width of the large-scale multiple-input multiple-output antenna can be configured by selecting the corresponding scene Pattern from the table 1 so as to obtain a better coverage effect. For example, selecting a Pattern with a wider horizontal bandwidth for a square scene to obtain a better lateral coverage; and selecting a Pattern with wider vertical wave width for a high-rise building scene to obtain better vertical coverage.

In practical applications, the coverage scene requirements of the cells may be diversified, and in order to make the coverage of the first NR cell and the coverage of the first LTE cell consistent, the horizontal bandwidth and the vertical bandwidth of the massive mimo antenna of the first NR cell need to be adjusted according to the coverage situation of the first LTE cell and the coverage scene requirements of the first NR cell. If the coverage area of the first NR cell has a square and a road bridge scene, and the coverage area of the first LTE cell mainly aims at the road bridge scene, then the Pattern (25 °,6 °) corresponding to the scene 5 sceniario_5 may be selected to configure the horizontal bandwidth and the vertical bandwidth of the Massive MIMO antenna of the first NR cell so as to be consistent with the coverage area of the first LTE cell.

The foregoing adjustment of the Massive MIMO antenna Pattern configuration may be implemented by changing the weight parameters of the antenna by the network management background, so as to change the coverage area of the NR cell, and further improve the switching synchronicity of the LTE cell and the NR cell.

Optionally, when the Pattern configuration is adjusted, the broadcast beam, the control beam and the service beam of the first NR cell received by the UE may be optimized, so as to further improve the matching degree of the coverage areas of the LTE cell and the NR cell for the UE. Wherein the broadcast beam is mainly used for user paging, the control beam mainly transmits control signaling, and the service beam mainly transmits service data. The cell coverage adjustment method of this embodiment may further include:

Step 260: and the NR base station to which the first NR cell belongs transmits broadcast beams in a polling mode, and the UE measures a plurality of broadcast beams transmitted by the NR base station at a plurality of times and selects one broadcast beam with better signal quality from the plurality of broadcast beams as a broadcast channel.

Specifically, the NR base station (i.e., gNodeB) to which the first NR cell belongs transmits broadcast beams by a polling method, and the UE measures the beams and obtains an optimal beam. The polling mode transmits a broadcast beam once every certain period. For example, the NR base station transmits a broadcast beam every 60 seconds, where the broadcast beams at different times have different channel qualities, and the UE measures the different broadcast beams received at different times, and selects a beam with a better signal quality, that is, the highest channel quality value, as the broadcast beam of the UE. The broadcast beam is used as a broadcast channel of the UE, and is used for transmitting a synchronization signal to the UE, so that the coverage of an NR cell to the broadcast channel and the synchronization signal of the UE is enlarged relative to the wide beam of an LTE cell, and the NR cell coverage of the UE is improved.

Step 270: and the NR base station selects a control wave beam with stronger reference signal receiving power intensity as a control channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

Specifically, the UE periodically sends a cell sounding signal (Sounding Reference Signal, SRS) to an NR base station (i.e., gndeb) to which the first NR cell belongs, where the NR base station obtains reference signal received powers (Reference Signal Received Power, RSRP) of a plurality of SRS signals sent by the UE at different times, and selects a control beam corresponding to an SRS signal with a stronger reference signal received power strength, i.e., a highest RSRP value, from the reference signal received powers as a control channel of the UE. The control beam transmits pilot signals to the UE, and compared with the wide beam of the LTE cell, the demodulation signal to noise ratio of the NR cell to the control channel and the pilot signals of the UE is improved, and the NR cell coverage of the UE is improved.

Step 280: and the NR base station selects a service wave beam with stronger reference signal receiving power intensity as a service channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

Specifically, the UE periodically sends a cell sounding signal (Sounding Reference Signal, SRS) to an NR base station (i.e., gndeb) to which the first NR cell belongs, where the NR base station obtains reference signal received powers (Reference Signal Received Power, RSRP) of a plurality of SRS signals sent by the UE at different times, and selects a service beam corresponding to an SRS signal with a stronger reference signal received power strength, i.e., a highest RSRP value, from the reference signal received powers as a service channel of the UE. The service beam aims at the UE to send data signals, and compared with the wide beam of the LTE cell, the demodulation signal to noise ratio of the NR cell to the service channel and the data signals of the UE is improved, and the NR cell coverage of the UE is improved.

And for the situation that the UE is switched from the second cell pair to the first cell pair and the switching between the LTE cell and the NR cell is not synchronous, the antenna Pattern configuration adjustment is carried out on the coverage area of the NR cell in the first cell pair, so that the coverage area of the NR cell is changed, the coverage area is consistent with the coverage area of the LTE cell, and the switching synchronism of the LTE cell and the NR cell is further improved. Furthermore, the control beam and the service beam are user-level beams and can cover all users under the cell, and through the beam optimization scheme, a more refined NR cell coverage effect can be provided for each UE so as to be matched with the wider beam coverage of the LTE cell. The broadcast beam is used as a cell grade beam, the coverage of a broadcast channel and a synchronous signal under an NR cell is enhanced through the Pattern configuration adjustment, and through the broadcast beam optimization scheme, a more refined NR cell coverage effect can be provided for each UE, the matching degree with the coverage of an LTE cell is improved, and the switching synchronicity of the LTE cell and the NR cell is improved.

After the antenna Pattern configuration adjustment is performed on the coverage area of the first NR cell in the first cell pair, verification analysis can be performed on the adjustment result, and specifically whether the expected switching synchronization effect is achieved can be analyzed through the result of the road test. If the handover asynchronization condition of the LTE cell and the NR cell still exists, the handover of the LTE cell and the NR cell can be synchronized by adjusting a CIO (cell independent offset) parameter to control the first handover time and the second handover time within a certain range. Of course, the CIO parameter may also be adjusted directly after the RF optimization adjustment for the first cell.

step 290: and if the second switching time is longer than the first switching time, reducing CIO parameters of the second LTE cell and the first LTE cell so that the absolute value of the difference between the second switching time and the first switching time is smaller than or equal to a preset value.

The CIO parameter is a cell mobility robustness optimization (Mobility Robust Optimization, MRO) parameter for optimizing inter-cell mobility robustness, the parameter value giving a unidirectional cell independent bias between the present cell (handover source cell) and the neighboring cell (handover target cell). When the CIO parameter is used, the UE adds the parameter value to the signal of the target cell to speed up or slow down the handover of the cell. Therefore, when the parameter value is increased and the UE is switched from the source cell to the target cell, the signal quality of the target cell is improved due to the bias treatment on the signal quality of the target cell, so that the switching zones of the two cells are advanced, and the switching from the source cell to the target cell is advanced; conversely, when the parameter value is reduced, the UE performs bias processing on the signal quality of the target cell when switching from the source cell to the target cell, so that the signal quality of the target cell is reduced, which may cause delay of switching between the two cells and delay of switching from the source cell to the target cell.

Specifically, when the UE switches from the second cell pair to the first cell pair, if the second switching time is greater than the first switching time, that is, the time of switching from the second LTE cell to the first LTE cell is before, and the time of switching from the second NR cell to the first NR cell is after, the CIO parameters of the second LTE cell and the first LTE cell may be reduced, so that the time of switching from the second LTE cell to the first LTE cell is delayed, and thus the absolute value of the difference between the second switching time and the first switching time is less than or equal to a preset value t, that is, the LTE cell and the NR cell switch are synchronized.

Step 2100: if the first switching time is longer than the second switching time, increasing CIO parameters of the second LTE cell and the first LTE cell so that the absolute value of the difference between the first switching time and the second switching time is smaller than or equal to a preset value.

Specifically, when the UE switches from the second cell pair to the first cell pair, if the first switching time is greater than the second switching time, that is, the time of switching from the second NR cell to the first NR cell is before, and the time of switching from the second LTE cell to the first LTE cell is after, the CIO parameters of the second LTE cell and the first LTE cell may be increased, so that the time of switching from the second LTE cell to the first LTE cell is advanced, and thus the absolute value of the difference between the first switching time and the second switching time is less than or equal to a preset value t, that is, the switching between the LTE cell and the NR cell is synchronous.

The above is adjustment of the CIO parameters of the LTE cell, and the adjustment of the CIO parameters of the NR cell can also be performed. The cell coverage adjusting method provided by the embodiment of the invention can further comprise the following steps:

step 2110: if the second switching time is longer than the first switching time, increasing CIO parameters of the second NR cell and the first NR cell so that the absolute value of the difference between the second switching time and the first switching time is smaller than or equal to a preset value.

Specifically, when the UE switches from the second cell pair to the first cell pair, if the second switching time is greater than the first switching time, that is, the time of switching from the second LTE cell to the first LTE cell is before, and the time of switching from the second NR cell to the first NR cell is after, the CIO parameters of the second NR cell and the first NR cell may be increased, so that the time of switching from the second NR cell to the first NR cell is advanced, and thus the absolute value of the difference between the second switching time and the first switching time is less than or equal to a preset value t, that is, the LTE cell and the NR cell switch are synchronized.

Step 2120: and if the first switching time is longer than the second switching time, reducing CIO parameters of the second NR cell and the first NR cell so that the absolute value of the difference between the first switching time and the second switching time is smaller than or equal to a preset value.

Specifically, when the UE switches from the second cell pair to the first cell pair, if the first switching time is greater than the second switching time, that is, the time of switching from the second NR cell to the first NR cell is before, and the time of switching from the second LTE cell to the first LTE cell is after, the CIO parameters of the second NR cell and the first NR cell may be reduced, so that the time of switching from the second NR cell to the first NR cell is delayed, and thus the absolute value of the difference between the first switching time and the second switching time is less than or equal to a preset value t, that is, the LTE cell and the NR cell switch are synchronized.

The above adjustment of the CIO parameter may be performed by selecting one of the CIO parameter of the LTE cell and the CIO parameter of the NR cell, or may be performed by both the adjustment.

The CIO parameter has a certain range, and the maximum value and the minimum value of the adjustment range are required to be set for the parameter. The adjustment range of the CIO parameters can be limited according to algorithm rules by combining MRO adjustment and other switching parameters. In a preferred implementation manner of the embodiment of the present invention, the minimum value CioAdjLowerLimit of the CIO parameter adjustment range during the same frequency handover (the frequencies of the source cell and the target cell are the same before and after the handover) is set as:

CioAdjLowerLimit＝Off+Ofs+Ocs-Ofn+Hys-5；

wherein Off is the same-frequency switching Offset value parameter IntraFreqHoA3Offset, ofs is the serving cell frequency Offset QoffsetFreq, ocs is the serving cell Offset cellspecific Offset, ofn is the neighbor cell frequency Offset QoffsetFreqConn, and Hys is the same-frequency switching amplitude hysteresis IntraFreqHoA3Hyst. The above parameters are basic handover parameters for mobility management of the wireless network system.

The larger the CioAdjLowerLimit parameter value is, the larger the lower limit of CIO parameter adjustment of an A3 event is when the MRO adjustment is performed in the same frequency switching, and the larger the lower limit of CIO parameter adjustment of an A3/A4 event is when the MRO adjustment is performed in the different frequency switching; the smaller the parameter value is, the smaller the CIO parameter adjustment lower limit of the A3 event is when the same frequency is switched with MRO adjustment, and the smaller the CIO parameter adjustment lower limit of the A3/A4 event is when the different frequency is switched with MRO adjustment.

The events A3 and A4 are trigger mechanisms for starting a cell switching flow in the mobility management of the wireless network system, and if the event A3 represents that the signal quality of a neighboring cell is higher than the signal quality of a serving cell by a certain bias, a source station starts a switching request when the event meeting the condition is reported; a4, when the event meeting the condition is reported, the source station starts a switching request; a5 event indicates that the quality of the service cell is lower than a certain threshold 1 and the quality of the neighbor cell is higher than a certain threshold 2, and when the event meeting the condition is reported, the source station starts a switching request.

In a preferred embodiment, the maximum value CioAdjUpperLimit of the co-channel switching CIO parameter adjustment range is set to:

CioAdjUpperLimit＝Off+Ofs+Ocs-Ofn+Hys-2；

wherein the meaning of each parameter is consistent with the meaning of each parameter in the formula of computing CioAdjLowerLimit.

The larger the CioAdjUpperLimit parameter value is, the larger the upper limit of CIO parameter adjustment of the A3 event is when the MRO adjustment is performed in the same frequency switching, and the larger the upper limit of CIO parameter adjustment of the A3/A4 event is when the MRO adjustment is performed in the different frequency switching; the smaller the parameter value is, the smaller the CIO parameter adjustment upper limit of the A3 event is when the same frequency is switched with MRO adjustment, and the smaller the CIO parameter adjustment upper limit of the A3/A4 event is when the different frequency is switched with MRO adjustment.

In a preferred embodiment, the minimum value of the CIO parameter adjustment range of the inter-frequency handover (the frequencies of the source cell and the target cell are different before and after the handover) is set as:

InterFreqCioAdjLowerLimit＝Off+Ofs+Ocs-Ofn+Hys-5；

wherein Off is an inter-frequency handover Offset value parameter InterFreqHoA3Offset, ofs is a serving cell frequency Offset QoffsetFreq, ocs is a serving cell Offset CellSpecificOoffset, ofn is a neighbor cell frequency Offset QoffsetFreqCon, and Hys is an inter-frequency handover amplitude hysteresis InterFreqHoA3Hyst. The above parameters are basic handover parameters for mobility management of the wireless network system.

The larger the InterFreqCioAdjLowerLimit parameter value is, the larger the CIO parameter adjustment lower limit of the A3/A4/A5 event is when the MRO is adjusted in the inter-frequency switching; the smaller the parameter value is, the smaller the CIO parameter adjustment lower limit of the A3/A4/A5 event is when the inter-frequency switching MRO is adjusted.

In a preferred embodiment, the inter-frequency handover CIO parameter tuning range maximum value, interffreqcioadjupperlimit, is set to:

InterFreqCioAdjUpperLimit＝Off+Ofs+Ocs-Ofn+Hys-2。

Wherein the meaning of each parameter is consistent with the meaning of each parameter in the formula of calculating InterFreqCioAdjLowerLimit.

The larger the InterFreqCioAdjUpperLimit parameter value is, the larger the CIO parameter adjustment upper limit of the A3/A4/A5 event is when the MRO is adjusted in the different frequency switching; the smaller the parameter value is, the smaller the CIO parameter adjustment upper limit of the A3/A4/A5 event is when the inter-frequency switching MRO is adjusted.

When the UE is switched from the second cell pair to the first cell pair and the CIO parameter between the first cell pair and the second cell pair is required to be adjusted, after the same-frequency switching CIO parameter adjustment range and the different-frequency switching CIO parameter adjustment range are calculated, one CIO parameter value can be selected in the same-frequency switching CIO parameter adjustment range to increase or decrease the same-frequency switching CIO parameter under the same-frequency switching condition, and one CIO parameter value can be selected in the different-frequency switching CIO parameter adjustment range to increase or decrease the different-frequency switching CIO parameter under the different-frequency switching condition. The same-frequency switching CIO parameter adjustment range and the different-frequency switching CIO parameter adjustment range of the LTE cell and the NR cell can be respectively determined according to the calculation method for determining the CIO parameter adjustment range. It should be noted that, the adjustment range of the CIO parameter in the inter-frequency switching may not be set separately, and other adjustment ranges of the CIO number in the same-frequency switching may be adopted.

And for the situation that the UE is switched from the second cell pair to the first cell pair and the switching between the LTE cell and the NR cell is not synchronous, the switching time of the LTE cell and/or the switching time of the NR cell is controlled through the adjustment of CIO parameters between the first cell pair and the second cell pair, and the switching band of the LTE cell and/or the NR cell is finely adjusted so as to further improve the switching synchronism of the LTE cell and the NR cell.

After CIO parameters are adjusted, verification analysis can be performed on the adjustment results, and whether the expected switching synchronization effect is achieved can be analyzed through the road test results. If the handover asynchronization condition of the LTE cell and the NR cell still exists, the steps related to the RF optimization adjustment and/or the antenna Pattern configuration adjustment and/or the CIO parameter adjustment can be repeated until the handover synchronization of the LTE cell and the NR cell is achieved.

In summary, in the cell coverage adjustment method provided by the embodiment of the present invention, for the situation that the LTE cell and the NR cell are not synchronized, by the foregoing optimization adjustment of the RF of the first cell, the RF parameters such as the mechanical downtilt angle, the mechanical azimuth angle, and the height of the antenna of the radio frequency of the first LTE cell and the first NR cell are adjusted to be consistent, so as to control the change of the switching band of the first LTE cell and the first NR cell, so that the coverage of the first LTE cell and the first NR cell are consistent, thereby achieving the purpose of synchronization of the LTE cell and the NR cell switching.

In specific practice, after the evaluation area and the test site are selected and optimized and adjusted according to the cell coverage adjustment method provided by the embodiment of the invention, the switching synchronicity of the LTE cell and the NR cell is greatly improved, the switching times are reduced by 32%, the synchronous switching proportion of 32.14% before optimized and adjusted is improved to 73.68%, the synchronous switching improving proportion reaches 42%, and the wireless network performance and 5G user service experience in NSA networking mode are effectively improved.

Fig. 3 shows a schematic structural diagram of a radio access network system according to an embodiment of the present invention, and as shown in fig. 3, the system 300 includes:

a first station 310 having a first LTE cell; a second station 320 having a first NR cell; the first LTE cell and the first NR cell are a first cell pair;

the antenna mechanical downtilt angle of the radio frequency of the first station 310 is set in a predetermined range, and the absolute value of the difference between the antenna mechanical downtilt angle of the radio frequency of the second station 320 and the antenna mechanical downtilt angle of the radio frequency of the first station 310 is smaller than or equal to a preset value;

the antenna mechanical azimuth angle of the radio frequency of the first station 310 is set in a predetermined range, and the absolute value of the difference between the antenna mechanical azimuth angle of the radio frequency of the second station 320 and the antenna mechanical azimuth angle of the radio frequency of the first station 310 is smaller than or equal to a preset value; and

The antenna height of the wireless radio frequency of the first station 310 is set within a predetermined range, and the absolute value of the difference between the antenna height of the wireless radio frequency of the second station 320 and the antenna height of the wireless radio frequency of the first station 310 is smaller than or equal to a preset value; so that the coverage areas of the first LTE cell and the first NR cell are consistent.

Optionally, the antenna mechanical downtilt angle of the radio frequency of the first station 310 is set within a predetermined range, and the absolute value of the difference between the antenna mechanical downtilt angle of the radio frequency of the second station 320 and the antenna mechanical downtilt angle of the radio frequency of the first station 310 is less than or equal to a preset value further includes:

the mechanical downtilt angle of the macro station antenna of the radio frequency of the first station 310 is 8 degrees to 12 degrees, and the absolute value of the difference between the mechanical downtilt angle of the macro station antenna of the radio frequency of the second station 320 and the mechanical downtilt angle of the macro station antenna of the radio frequency of the first station 310 is less than or equal to 2 degrees;

the antenna mechanical azimuth angle of the radio frequency of the first station 310 is set within a predetermined range, and the absolute value of the difference between the antenna mechanical azimuth angle of the radio frequency of the second station 320 and the antenna mechanical azimuth angle of the radio frequency of the first station 310 is less than or equal to a preset value further includes:

The width of the vertical lobe of the macro station antenna of the radio frequency of the first station 310 is 5 degrees to 8 degrees, and the absolute value of the difference between the width of the vertical lobe of the macro station antenna of the radio frequency of the second station 320 and the width of the vertical lobe of the macro station antenna of the radio frequency of the first station 310 is less than or equal to 1 degree;

the antenna height of the radio frequency of the first station 310 is set within a predetermined range, and the absolute value of the difference between the antenna height of the radio frequency of the second station 320 and the antenna height of the radio frequency of the first station 310 is less than or equal to a preset value further includes:

the height of the macro station antenna of the radio frequency of the first station 310 is 18 meters to 22 meters, and the absolute value of the difference between the height of the macro station antenna of the radio frequency of the second station 320 and the height of the macro station antenna of the radio frequency of the first station 310 is less than or equal to 1 meter.

the mechanical downtilt angle of the MM antenna of the radio frequency of the first station 310 is 8 ° to 12 °, and the absolute value of the difference between the mechanical downtilt angle of the MM antenna of the radio frequency of the second station 320 and the mechanical downtilt angle of the MM antenna of the radio frequency of the first station 310 is less than or equal to 2 °;

the width of the MM antenna vertical lobe of the radio frequency of the first station 310 is 8 ° to 10 °, and the absolute value of the difference between the width of the MM antenna vertical lobe of the radio frequency of the second station 320 and the width of the MM antenna vertical lobe of the radio frequency of the first station 310 is 1 ° or less;

the height of the MM antenna of the radio frequency of the first station 310 is 18 m to 22 m, and the absolute value of the difference between the height of the MM antenna of the radio frequency of the second station 320 and the height of the MM antenna of the radio frequency of the first station 310 is less than or equal to 2 m.

Optionally, the horizontal bandwidth and the vertical bandwidth of the massive mimo antenna of the second station 320 are adjusted by selecting a Pattern configuration from a scene configuration table according to the coverage area of the first LTE cell and the coverage scene requirement of the first NR cell, so that the coverage area of the first NR cell is consistent with the coverage area of the first LTE cell.

Optionally, the second station 320 transmits the broadcast beam in a polling manner, so that the UE measures a plurality of broadcast beams transmitted by the second station 320 at a plurality of times, and selects one broadcast beam with better signal quality as a broadcast channel.

Optionally, the second station 320 receives a cell sounding signal sent by the UE in a predetermined period, and selects, as the control channel, a control beam with stronger reference signal received power strength for the UE according to a plurality of cell sounding signals sent by the UE in a plurality of times.

Optionally, the second station 320 receives the cell probing signals sent by the UE in a predetermined period, and selects a service beam with stronger reference signal receiving power strength for the UE as a service channel according to the multiple cell probing signals sent by the UE in multiple times.

The first station 310 is specifically an LTE base station, and the second station 320 is specifically an NR base station.

It should be noted that, the above-mentioned radio access network system and the cell coverage adjustment method provided by the embodiment of the present invention are based on the same concept, and specific content can be referred to the description in the embodiment of the cell coverage adjustment method of the present invention, which is not repeated here.

In summary, in the radio access network system provided by the embodiment of the present invention, for the situation that the handover between the LTE cell and the NR cell is not synchronous, by the above-mentioned optimization adjustment for the RF of the station, the RF parameters such as the mechanical downtilt angle, the mechanical azimuth angle, the height, etc. of the antenna of the radio frequency of the first station 310, to which the first LTE cell belongs, and the radio frequency of the second station 320, to which the first NR cell belongs, are adjusted to be consistent, so as to control the change of the handover between the first LTE cell and the first NR cell, so that the coverage range between the first LTE cell and the first NR cell is basically consistent, and the purpose of handover synchronization between the LTE cell and the NR cell is achieved. Further, by performing the antenna Pattern configuration adjustment on the second station 320, the coverage area of the NR cell is further changed, and the coverage area is consistent with that of the LTE cell, so as to further improve the handover synchronicity of the LTE cell and the NR cell. Further, through the beam optimization scheme, a more refined NR cell coverage effect can be provided for each UE so as to be matched with the wider beam coverage of the LTE cell. The broadcast beam is used as a cell grade beam, the coverage of a broadcast channel and a synchronous signal under an NR cell is enhanced through the Pattern configuration adjustment, and through the broadcast beam optimization scheme, a more refined NR cell coverage effect can be provided for each UE, the matching degree with the coverage of an LTE cell is improved, and the switching synchronicity of the LTE cell and the NR cell is improved.

The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.

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

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

Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component, and they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.

Claims

1. A method for adjusting cell coverage, wherein the cells include a first LTE cell and a first NR cell, the first LTE cell and the first NR cell being a first cell pair, the method comprising:

setting the antenna mechanical downtilt angle of the first LTE cell radio frequency within a preset range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the first NR cell radio frequency and the antenna mechanical downtilt angle of the first LTE cell radio frequency to be smaller than or equal to a preset value, wherein the method comprises the following steps: setting the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees;

setting the antenna mechanical azimuth angle of the first LTE cell radio frequency within a preset range, adjusting the absolute value of the difference between the antenna mechanical azimuth angle of the first NR cell radio frequency and the antenna mechanical azimuth angle of the first LTE cell radio frequency to be smaller than or equal to a preset value, and comprising: setting the vertical lobe width of a macro station antenna of the wireless radio frequency of the first LTE cell to be 5-8 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the macro station antenna of the wireless radio frequency of the first NR cell and the vertical lobe width of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 degree; and

Setting the antenna height of the first LTE cell radio frequency within a predetermined range, adjusting the absolute value of the difference between the antenna height of the first NR cell radio frequency and the antenna height of the first LTE cell radio frequency to be less than or equal to a preset value, including: setting the height of a macro station antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the macro station antenna of the wireless radio frequency of the first NR cell and the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 meter; so that the coverage areas of the first LTE cell and the first NR cell are consistent.

2. The method of claim 1, wherein the setting the antenna mechanical downtilt angle of the first LTE cell radio frequency to be within the predetermined range, and adjusting the absolute value of the difference between the antenna mechanical downtilt angle of the first NR cell radio frequency and the antenna mechanical downtilt angle of the first LTE cell radio frequency to be less than or equal to a preset value comprises:

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. A method according to claim 3, characterized in that the method further comprises:

and the NR base station to which the first NR cell belongs transmits broadcast beams in a polling mode, and the UE measures a plurality of broadcast beams transmitted by the NR base station at a plurality of times and selects one broadcast beam with the best signal quality from the plurality of broadcast beams as a broadcast channel.

5. The method according to claim 4, wherein the method further comprises:

and the NR base station selects a control wave beam with the strongest reference signal receiving power intensity as a control channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

6. The method according to claim 4, wherein the method further comprises:

and the NR base station selects a service wave beam with the strongest reference signal receiving power intensity as a service channel for the UE according to a plurality of cell detection signals sent by the UE at a plurality of times.

7. The method according to claim 1 or 2, characterized in that the method further comprises:

8. The method according to claim 1 or 2, characterized in that the method further comprises:

9. A radio access network system, the system comprising:

The antenna mechanical downtilt angle of the first station wireless radio frequency is set in a preset range, the absolute value of the difference between the antenna mechanical downtilt angle of the second station wireless radio frequency and the antenna mechanical downtilt angle of the first station wireless radio frequency is smaller than or equal to a preset value, and the method comprises the following steps: setting the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be 8-12 degrees, and adjusting the absolute value of the difference between the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first NR cell and the mechanical downtilt angle of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 2 degrees;

the antenna mechanical azimuth angle of the first station wireless radio frequency is set in a preset range, the absolute value of the difference between the antenna mechanical azimuth angle of the second station wireless radio frequency and the antenna mechanical azimuth angle of the first station wireless radio frequency is smaller than or equal to a preset value, and the method comprises the following steps: setting the vertical lobe width of a macro station antenna of the wireless radio frequency of the first LTE cell to be 5-8 degrees, and adjusting the absolute value of the difference between the vertical lobe width of the macro station antenna of the wireless radio frequency of the first NR cell and the vertical lobe width of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 degree; and

The antenna height of the first station wireless radio frequency is set in a preset range, the absolute value of the difference between the antenna height of the second station wireless radio frequency and the antenna height of the first station wireless radio frequency is smaller than or equal to a preset value, and the method comprises the following steps: setting the height of a macro station antenna of the wireless radio frequency of the first LTE cell to be 18-22 meters, and adjusting the absolute value of the difference between the height of the macro station antenna of the wireless radio frequency of the first NR cell and the height of the macro station antenna of the wireless radio frequency of the first LTE cell to be less than or equal to 1 meter; so that the coverage areas of the first LTE cell and the first NR cell are consistent.