CN102904018B - A kind of method and device of active antenna self-adaptative adjustment angle of declination - Google Patents

Abstract

The invention discloses a method and device for adaptively adjusting the downtilt angle of an active antenna, wherein the method of the invention includes: increasing the uplink downtilt angle of the antenna according to a predetermined step size, until the collected key performance index KPI no longer increases , and then perform the first parameter rollback operation; after the first parameter rollback operation, reduce the angle of the uplink and downtilt angles of the antenna according to the predetermined step size one by one until the KPIs collected later no longer increase, and then perform the second Secondary parameter rollback operation: After the second parameter rollback operation, the downlink downtilt angle of the antenna is fixed, and the uplink downtilt angle of the antenna is gradually reduced by a predetermined step size until the cell edge coverage performance is no longer improved. The invention can automatically optimize the network, effectively utilize the characteristics of the active antenna, and avoid the problems of resource consumption, untimely and inaccurate manual optimization.

Description

A method and device for adaptively adjusting the downtilt angle of an active antenna

technical field

The invention relates to the technical field of wireless communication, in particular to a method and a device for adaptively adjusting the downtilt angle of an active antenna.

Background technique

The radio frequency unit and the antenna of the traditional base station are designed separately. The antenna has multiple passive elements to realize the antenna beamforming. For the electrically adjustable antenna, only the phase of each element is adjusted to realize the downtilt control.

The active antenna combines the traditional passive antenna and RRU into a whole, and feeds each element of the antenna separately, which will bring many benefits: green environmental protection, ultra-wideband, easy installation, high robustness, and system capacity will lift.

Compared with traditional passive antennas, the advantages of active antennas are as follows:

1. Up and down independent downtilt

Traditional antennas use the same downtilt angle for uplink and downlink. When the downlink performance is optimal, the uplink performance may not be optimal. Active antennas can use different downtilt angles for uplink and downlink. When the downlink downtilt angle is fixed, the uplink performance is not necessarily optimal. Capacity or terminal battery life etc. will be improved.

2. Carrier/system independent downtilt

Different carriers/systems have different requirements for the downtilt angle. Traditional antennas can only take a compromise among them. Active antennas can independently control the beams of different carriers/systems, so that the performance of the network can reach optimal, and the sharing of the wireless access network will be further simplified. For example, GSM and UMTS R99 systems have different requirements for downtilt.

3. Vertical multi-sector

Vertical multi-sector splits the original sector into two sectors, doubling the resources, and thus significantly improving the system capacity.

The above three functional advantages all need to optimize and adjust the downtilt angle of the uplink and downlink. The existing technology has the following defects or deficiencies: the uplink downtilt angle of the active antenna cannot be adaptively adjusted according to the network conditions to achieve the optimization of network performance.

Contents of the invention

The object of the present invention is to provide a method for adaptively adjusting the downtilt angle of an active antenna, so as to adaptively adjust the uplink downtilt angle of the active antenna according to network conditions, so as to optimize network performance.

With the development of wireless networks, the proportion of data services has increased significantly, and the uplink and downlink service traffic generally presents an asymmetrical characteristic, usually due to limited downlink capacity; moreover, due to the limitation of terminal power, generally uplink coverage is limited . Therefore, the method described in this paper is based on network KPI (including capacity), and then focuses on uplink edge coverage.

Another object of the present invention is to provide a device for implementing the above method.

According to the first aspect of the present invention, a method for adaptively adjusting the downtilt angle of an active antenna provided includes the following steps:

Increase the uplink and downtilt angles of the antenna successively according to the predetermined step size until the collected key performance indicators KPI no longer increase, and then perform the first parameter rollback operation;

After performing the first parameter rollback operation, reduce the angle of the antenna’s uplink and downtilt angles successively according to the predetermined step size, until the subsequently collected KPIs are no longer increased, and then perform the second parameter rollback operation;

After the second parameter rollback operation, the downlink downtilt angle of the antenna is fixed, and the uplink downtilt angle of the antenna is gradually reduced by a predetermined step size until the cell edge coverage performance is no longer improved.

Preferably, the step of increasing the up and down tilt angle of the antenna successively according to a predetermined step size until the collected KPI no longer increases comprises: after increasing the up and down tilt angle of the antenna by a predetermined step size each time, collecting the KPI and Determine whether it is improved; if it is determined that the KPI is improved, continue to increase the downtilt angle of the antenna, otherwise, stop the increase in the uplink and downlink angles of the antenna.

Preferably, performing the first parameter fallback operation includes: returning the downtilt angle of the uplink and downlink of the antenna to the last position when the downtilt angle stopped increasing.

Preferably, the step of decreasing the downtilt angle of the antenna successively by a predetermined step until the KPI collected thereafter no longer increases comprises: after reducing the downtilt angle of the antenna up and down by a predetermined step each time, collecting KPI and judge whether it is increased; if it is judged that the KPI is increased, then continue to decrease the uplink downtilt angle of the antenna, otherwise, stop the decrease of the antenna uplink downtilt angle.

Preferably, performing the second parameter fallback operation includes: returning the downtilt angle of the uplink and downlink of the antenna to the last position when the downtilt angle stopped decreasing.

Preferably, the step of reducing the uplink downtilt angle of the antenna successively according to a predetermined step size until the cell edge coverage performance is no longer improved comprises: after reducing the uplink downtilt angle angle of the antenna according to a predetermined step size each time, receiving the reflected If it is judged that the coverage index of the cell edge is improved, then continue to reduce the uplink downtilt angle of the antenna, otherwise, stop the reduction of the uplink downtilt angle of the antenna.

Preferably, the signal reflecting the coverage performance of the cell edge is the serving cell radio link measurement signal RSRP and /RSRQ reported by the cell edge user.

Preferably, the cell edge user is obtained by comparing the distance between the user location and the station location.

Preferably, the KPI includes: one or a combination of a cell KPI, a switching matrix and an interference matrix.

According to the second aspect of the present invention, a device for adaptively adjusting the downtilt angle of an active antenna provided includes:

The uplink downtilt angle increase adjustment module is used to increase the uplink downtilt angle of the antenna according to the predetermined step size until the collected KPI is no longer improved, and then perform the first parameter rollback operation;

The uplink downtilt angle reduction adjustment module is used to reduce the uplink downtilt angle of the antenna according to the predetermined step size after the first parameter rollback operation until the KPIs collected later are no longer increased, and then perform the second Secondary parameter rollback operation;

The uplink downtilt angle reduction adjustment module is used to fix the downlink downtilt angle of the antenna after the second parameter rollback operation, and gradually reduce the uplink downtilt angle of the antenna according to the predetermined step size until the received cell edge coverage index No longer improving.

Compared with the prior art, the beneficial technical effect of the present invention is:

1) It can automatically optimize the network, effectively utilize the characteristics of active antennas, and avoid the problems of resource consumption, untimely and inaccurate manual optimization.

2) By automatically optimizing the uplink downtilt angle, the capacity and quality of the wireless network can be effectively improved, uplink coverage can be improved and terminal power consumption can be reduced.

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of a method for adaptively adjusting the downtilt angle of an active antenna of the present invention;

Fig. 2 is a schematic diagram of a device for adaptively adjusting the downtilt angle of an active antenna according to the present invention;

Fig. 3 is a flow chart of an embodiment of the active antenna adaptively adjusting the downtilt angle of the present invention.

detailed description

Fig. 1 has shown the method for a kind of active antenna adaptive adjustment downtilt angle of the present invention, comprises the following steps:

Increase the uplink and downtilt angles of the antenna successively according to the predetermined step size until the collected key performance indicators KPI no longer increase, and then perform the first parameter rollback operation;

After performing the first parameter rollback operation, reduce the angle of the antenna’s uplink and downtilt angles successively according to the predetermined step size, until the subsequently collected KPIs are no longer increased, and then perform the second parameter rollback operation;

After the second parameter rollback operation, the downlink downtilt angle of the antenna is fixed, and the uplink downtilt angle of the antenna is gradually reduced by a predetermined step size until the cell edge coverage performance is no longer improved.

The aforementioned KPIs include: one or a combination of a cell KPI, a switching matrix, and an interference matrix.

The above-mentioned signals reflecting the coverage performance of the cell edge are the radio link measurement signals RSRP and /RSRQ of the serving cell reported by the cell edge users, wherein the cell edge users are obtained by comparing the distance between the user location and the station location.

In addition, the above step of increasing the up and down tilt angle of the antenna successively according to the predetermined step size until the collected KPI no longer increases includes: after each time the up and down tilt angle of the antenna is increased according to the predetermined step size, collecting KPI and judging its Whether to increase; if it is judged that the KPI is improved, continue to increase the downtilt angle of the antenna, otherwise, stop the increase in the uplink and downlink angles of the antenna.

In addition, the above-mentioned first parameter fallback operation includes: returning the downtilt angle of the antenna to the last position when the downtilt angle stopped increasing; that is, after the downtilt angle of the antenna stops increasing , the downtilt angle decreases by a predetermined step size, for example, if the predetermined step size is 0.5 degrees, the downtilt angle decreases by 0.5 degrees from the angle at which the increase was stopped.

In addition, the step of decreasing the downtilt angle of the antenna successively according to the predetermined step size until the subsequently collected KPI no longer increases includes: after each time the uplink downtilt angle of the antenna is reduced according to the predetermined step size, the KPI is collected and Judging whether it is improved; if it is judged that the KPI is increased, continue to decrease the uplink and downtilt angles of the antenna, otherwise, stop the decrease of the uplink and downlink downtilt angles of the antenna.

In addition, the above-mentioned performing the second parameter fallback operation includes: returning the downtilt angle of the uplink and downlink of the antenna to the previous position when the downtilt angle stopped decreasing. That is, after the downtilt angle of the antenna stops decreasing, the downtilt angle increases by a predetermined step; for example, if the predetermined step is 0.5 degrees, the downtilt angle increases by 0.5 degrees from the angle when the increase is stopped .

In addition, the step of reducing the uplink downtilt angle of the antenna according to the predetermined step size until the cell edge coverage performance is no longer improved includes: after reducing the uplink downtilt angle angle of the antenna according to the predetermined step size each time, receiving the reflected cell edge Cover performance signals and judge whether the cell edge coverage performance is improved; if it is judged that the cell edge coverage index is improved, continue to reduce the uplink downtilt angle of the antenna, otherwise, stop the reduction of the antenna uplink downtilt angle.

Figure 2 shows a device for adaptively adjusting the downtilt angle of an active antenna of the present invention, as shown in Figure 2, including:

The uplink downtilt angle increase adjustment module is used to increase the uplink downtilt angle of the antenna according to the predetermined step size until the collected KPI is no longer improved, and then perform the first parameter rollback operation;

The uplink downtilt angle reduction adjustment module is used to reduce the uplink downtilt angle of the antenna according to the predetermined step size after the first parameter rollback operation until the KPIs collected later are no longer increased, and then perform the second Secondary parameter rollback operation;

The uplink downtilt angle reduction adjustment module is used to fix the downlink downtilt angle of the antenna after the second parameter rollback operation, and gradually reduce the uplink downtilt angle of the antenna according to the predetermined step size until the received cell edge coverage index No longer improving.

Fig. 3 shows the flow of a specific embodiment of the present invention, which is the self-adaptive adjustment of uplink and downlink independent downtilt angles. As shown in Figure 3, the process of this embodiment includes:

Step 1. The downtilt angle of the up and down lines increases in steps of 0.5 degrees.

Step 2. Collection and analysis of KPI indicators, including cell KPI, handover matrix, interference matrix, etc.

Examples of KPI indicators

category KPI indicators

Community KPIs throughput E-RAB establishment success rate E-RAB drop rate Handover success rate Interference matrix (reported by UE) Serving cell RSRP Neighboring Cell RSRP

Step 3. OAM (operation management and maintenance platform) evaluates the effect after optimization according to the KPI index for a period of time. If the performance is improved, OAM confirms the optimization operation, and the downtilt angle of the uplink and downlink continues to increase in steps of 0.5 degrees; if If the performance is not improved, parameter rollback can be performed to return the system to the state before the last optimization operation.

Step 4. If the parameter is reversed, the downtilt angle of the up and down lines is reduced in steps of 0.5 degrees. OAM evaluates the optimized effect according to the KPI index. If the performance is improved, OAM confirms the optimization operation, and the downtilt angle of the uplink and downlink continues to decrease with a step size of 0.5 degrees; if the performance is not improved, the parameters can be rolled back so that The system returns to the state before the last optimization operation.

Step 5. Fix the downward inclination angle, and decrease the upward inclination angle in steps of 0.5 degrees. OAM evaluates the effect of optimization according to the RSRP and RSRQ messages of the cell edge users. If the performance is improved, OAM confirms the optimization operation, and the uplink downtilt angle is reduced in steps of 0.5 degrees; if the performance is not improved, parameter return can be performed. Back, let the system return to the state before the optimization operation.

The method for judging whether it is a cell edge user is to match the ECGI/CGI reported by the terminal with the site, and then compare the distance between the location reported by the terminal and the location of the matching site.

In addition, the process of the embodiment of the present invention may also include the step of setting the area to be optimized. In this step, the system sends a measurement configuration message to the terminal in the area to be optimized, wherein the measurement configuration message is independent of the normal RRM (Radio Resource Management, radio resource management) purpose of the network; the terminal records and periodically reports the measurement message and location information and time information.

The above measurement messages include but are not limited to the following messages: downlink pilot strength measurement, serving cell quality RSRQ, serving cell ECGI/CGI (Evolved Cell Global Identifier, global cell identification code), neighbor PCI (Physical Cell Identifier, physical cell identification) , terminal transmit power, paging channel demodulation failure, broadcast channel demodulation failure, traffic channel demodulation failure, RLF (Radio Link Failure, radio link failure), radio link measurement (RSRP, RSRQ, etc.) of the serving cell is lower than a certain threshold etc.

Wherein, the terminal performs location positioning first, and then reports the location information. Positioning methods based on mobile communication networks include, but are not limited to: Observed Time Difference of Arrival (OTDOA), Observed Time Difference of Arrival, and GPS (Global Positioning System, Global Positioning System) integrated positioning. The observed time difference of arrival and GPS integrated positioning are preferred. If the number of GPS locked satellites is less than 4, the observed time difference of arrival method is used.

Configuration parameter information of sites and cells, including but not limited to:

category configuration Site Configuration Parameters Site location and height Cell Configuration Parameters Antenna model Antenna azimuth up and down inclination down slope number of vertical sectors

To sum up, the present invention can automatically perform network optimization, effectively utilize the characteristics of active antennas, and avoid problems such as resource consumption, untimely, and inaccurate manual optimization. In addition, the present invention can effectively improve the capacity and quality of the wireless network by automatically optimizing the uplink and downtilt angles.

The above are only preferred implementation examples of the present invention, and are not intended to limit the present invention. The present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can Various corresponding changes and modifications are made in the present invention, but these corresponding changes and modifications should all belong to the protection scope of the appended claims of the present invention.

Claims (7)

1. the method for an active antenna self-adaptative adjustment angle of declination, it is characterised in that comprise the following steps:

Gradually increase antenna up-downgoing angle of declination angle by pre-fixed step size, until the Key Performance Indicator KPI collected no longer carries Rise, then carry out parameters back operation for the first time；

After carrying out parameters back operation for the first time, gradually reduce the angle of antenna up-downgoing angle of declination by pre-fixed step size, until The KPI collected subsequently no longer promotes, and then carries out second time parameters back operation；

After carrying out second time parameters back operation, the descending angle of declination of fixed antenna, and gradually reduce on antenna by pre-fixed step size The angle of row angle of declination, until cell edge covering performance no longer improves；

The parameters back operation for the first time of described carrying out includes: the angle of declination angle of antenna up-downgoing is returned to its angle of declination angle Degree stops last position when increasing；

Described carrying out second time parameters back operation includes: the angle of declination angle of antenna up-downgoing is returned to its angle of declination angle Degree stops last position when reducing；

Described KPI includes: one of community critical index, switching matrix and interference matrix or combination；Described community is key Index comprises handling capacity.

Method the most according to claim 1, it is characterised in that described is gradually increased under antenna up-downgoing by pre-fixed step size Tilt angles, until the step that the KPI collected no longer promotes includes:

Increasing antenna up-downgoing angle of declination angle by pre-fixed step size after every time, gather KPI and judge whether it promotes；

If judging, KPI promotes, then continue the increase of Downtilt angle, otherwise, then stop the angle of declination angle of antenna up-downgoing The increase of degree.

Method the most according to claim 2, it is characterised in that described gradually reduces Downtilt by pre-fixed step size Angle, until the step that the KPI collected subsequently no longer promotes includes:

Reducing antenna up-downgoing angle of declination angle by pre-fixed step size after every time, gather KPI and judge whether it promotes；

If judging, KPI promotes, then continue the reduction of antenna up-downgoing angle of declination angle, otherwise, then stop antenna up-downgoing and have a down dip The reduction of angle angle.

Method the most according to claim 1, it is characterised in that described gradually has a down dip by pre-fixed step size reduction antenna uplink The angle at angle, until the step that cell edge covering performance no longer improves includes:

After reducing antenna uplink angle of declination angle by pre-fixed step size, receive the signal of reflection cell edge covering performance also every time Judge whether its cell edge covering performance improves；

If judging, cell edge covers target improvement, then continue the reduction of antenna uplink angle of declination angle, otherwise, then stop antenna The reduction of up angle of declination angle.

Method the most according to claim 4, it is characterised in that the signal of described reflection cell edge covering performance is little The Serving cell wireless link of area edge reporting of user measures signal RSRP and/or RSRQ.

Method the most according to claim 5, it is characterised in that described Cell Edge User is by by customer location and station The distance of some position compares and draws.

7. the device of an active antenna self-adaptative adjustment angle of declination, it is characterised in that including:

Up-downgoing angle of declination angle increases adjusting module, for gradually increasing antenna up-downgoing angle of declination angle by pre-fixed step size, Until the KPI collected no longer promotes, then carry out parameters back operation for the first time；

Up-downgoing angle of declination angle reduces adjusting module, for after carrying out parameters back operation for the first time, gradually by predetermined step The long angle reducing antenna up-downgoing angle of declination, until the KPI collected subsequently no longer promotes, then carries out second time parameter and returns Move back operation；

Up angle of declination angle reduces adjusting module, is used for after carrying out second time parameters back operation, under fixed antenna is descending Inclination angle, and gradually reduce the angle of antenna uplink angle of declination by pre-fixed step size, until the cell edge received covers index not Improve again；

The parameters back operation for the first time of described carrying out includes: the angle of declination angle of antenna up-downgoing is returned to its angle of declination angle Degree stops last position when increasing；

Described carrying out second time parameters back operation includes: the angle of declination angle of antenna up-downgoing is returned to its angle of declination angle Degree stops last position when reducing；

Described KPI includes: one of community critical index, switching matrix and interference matrix or combination；Described community is key Index comprises handling capacity.