TWI695640B - Group base stations transmit power and antenna pattern joint optimization system and method - Google Patents

Abstract

The invention discloses Group base stations transmit power and antenna pattern joint optimization system and method. User equipments (UE) report UE data to base stations, the base stations report the UE data, number of handovers of adjacent base stations, and information of environment scan to a network controller, and then the network controller divides the base stations into a group base station to establish a group base station list. The network controller instructs the base stations to switch their antenna beam directions one by one or successively to each of different antenna beam directions to collect sufficient UE data, and establishs a sorted list of transmit power and antenna pattern or antenna beam direction of the group base station. The network controller finds a best solution from the sorted list to instruct the base stations to jointly adjust their transmit power and antenna pattern or beam radiation direction to the optimal solution.

Description

System and method for joint optimization of group base station transmit power and antenna pattern

The invention relates to a base station transmission power and antenna field pattern optimization technology, in particular to a group base station transmission power and antenna field pattern joint optimization system and method.

Due to the increasing demand for mobile network traffic, operators tend to intensively deploy small base stations in crowded areas with high traffic demand to achieve high network coverage and provide sufficient mobile network capacity. And reduce the cost of network deployment.

Traditionally, omnidirectional antennas are built in small base stations, and the radiation pattern of the antenna is fixed and radiates evenly around. However, as the demand for mobile network communications continues to increase, densely deploying small base stations becomes the future trend, but when multiple adjacent base stations coexist, co-channel interference between multiple base stations will be seriously affected Wireless signal quality. In other words, if there are base stations with the same frequency in the adjacent area, the same frequency interference between multiple base stations will cause the signal quality of the wireless environment to degrade, reducing the transmission rate and the user equipment (UE) transmission rate. Quality greatly affects the user's feelings.

Furthermore, in a network environment where there are multiple (eg, n) base stations, if there are multiple (eg, m) switchable antenna patterns or antenna beam directions for each base station’s antenna, then In the wireless environment of this group of base stations, there should be possible solutions of m nth power (ie m ⁿ ) antenna field patterns or antenna beam directions, so that the wireless system needs to perform m nth power (ie m ⁿ ) antennas Scanning can find the best solution for the configuration of the antenna pattern of the base station, thereby greatly increasing the number and time cost of switching or scanning the antennas of multiple base stations.

Therefore, how to optimize the transmission power of the group base station and the antenna pattern or antenna beam direction has become a major issue for those skilled in the art.

The invention provides a system and method for jointly optimizing the transmission power of a group base station and the antenna pattern, which can jointly optimize the transmission power of the group base station and the antenna pattern or antenna beam direction.

The group base station transmission power and antenna pattern joint optimization system of the present invention includes: multiple user devices with the ability to report user device data; multiple base stations receiving user device data reported by multiple user devices , And can report the user device data, the number of handovers between neighboring base stations and the information scanned by the base station measurement environment to the network controller; and at least one network controller based on users from multiple base stations The device data, the number of handovers between neighboring base stations and the information scanned by the base station's measurement environment divides multiple base stations into at least one group of base stations to establish the transmission power and antenna field for the group of base stations Optimized list of group base stations; where the network controller instructs multiple base stations in the group base station to switch their antenna beam directions one by one or one by one to multiple different antenna beam directions according to the group base station list Each of them is used by the network controller to collect data for a certain period of time or enough user device data in multiple different antenna beam directions, and the network controller is based on the collected user equipment Set the data and the adjustable range of the transmission power of multiple base stations to create a sorted list of the transmission power of the group base station and the antenna pattern or antenna beam direction, and then select the transmission power of the group base station and the antenna pattern or antenna Find the best solution in the sorted list of beam directions for the network controller to instruct multiple base stations to jointly adjust their transmit power and antenna pattern or beam radiation direction to the best solution.

The group base station transmission power and antenna pattern joint optimization method of the present invention includes: multiple user devices report user device data, and multiple base stations receive user device data reported by multiple user devices for Multiple base stations report user device data, the number of handovers between neighboring base stations, and the information scanned by the base station measurement environment to the network controller; at least one network controller based on the user devices from multiple base stations The data, the number of handovers between neighboring base stations and the information scanned by the base station's measurement environment divides multiple base stations into at least one group of base stations to establish the transmission power and antenna pattern for the group of base stations Optimized group base station list; the network controller instructs multiple base stations in the group base station to switch their antenna beam directions one by one or sequentially to each of multiple different antenna beam directions according to the group base station list In order for the network controller to collect user device data in a plurality of different antenna beam directions for a period of time or enough; the network controller according to the collected user device data and the transmission power of multiple base stations Adjustable range to create a sorted list of the transmission power of the group base station and the antenna pattern or antenna beam direction; find out from the sorted list of the transmission power of the group base station and the antenna pattern or antenna beam direction by the network controller The best solution; and the network controller instructs multiple base stations to jointly adjust their transmission power and antenna pattern or beam radiation direction to the best solution.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description. The following description will partially explain the additional features of the present invention Features and advantages, and these features and advantages will be partially apparent from the description, or may be learned by practicing the present invention. The features and advantages of the present invention are recognized and achieved by means of the elements and combinations particularly pointed out in the scope of the patent application. It should be understood that both the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the claimed scope of the invention.

1‧‧‧ Group base station transmission power and antenna pattern joint optimization system

10‧‧‧User device (UE)

11‧‧‧User device data

20‧‧‧ group base station

21‧‧‧ Base Station (BS)

30‧‧‧Network Controller

31‧‧‧ Group base station list

32‧‧‧Sort list

Sector_i, Sector_j, Sector_k‧‧‧‧ antenna beam direction

S1 to S6‧‧‧ steps

Figure 1 is a schematic architecture diagram of a group base station transmission power and antenna pattern joint optimization system of the present invention; Figure 2 is a switchable three different antenna beam directions of a smart antenna system such as a base station of the present invention Schematic diagram; Figure 3 is a schematic diagram of the initial antenna beam directions of multiple base stations of the present invention are the first antenna beam direction (such as Sector_i direction); Figure 4 is a group base station transmit power and antenna field of the present invention 5A to 5C are schematic diagrams of the network controller of the present invention instructing multiple base stations in a group of base stations to switch their antenna beam directions to the same antenna beam direction; 6 is a sorted list of the transmission power of the group base station and the antenna pattern or antenna beam direction in the present invention; and FIGS. 7A and 7B are respectively the average signal-to-noise ratio of multiple user devices of the present invention before optimization And the optimized simulation result graph, Figure 7C is the related label, signal-to-noise ratio (SINR) and signal quality table of Figure 7A and Figure 7B.

The following describes the embodiments of the present invention by specific specific embodiments. Those familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification, and can also be implemented by other different specific embodiments. Or application.

FIG. 1 is a schematic architecture diagram of a group base station transmission power and antenna pattern joint optimization system 1 of the present invention. As shown in the figure, the group base station transmit power and antenna field pattern joint optimization system 1 can be applied to the network environment of multiple adjacent base stations 21 (such as mobile base stations), and includes multiple user devices (UE 10.) A plurality of base stations (BS) 21 and at least one network controller (Network controller) 30.

The multiple user devices 10 can report the user device data 11 to the multiple base stations 21 or the network controller 30. The multiple base stations 21 can receive the user device data 11 reported by the multiple user devices 10, and can report the user device data 11, the number of handovers between adjacent base stations 21, and the base station 21 measurement environment scan (REM )'S information to the network controller 30. The network controller 30 may divide the plurality of base stations 21 into at least one based on the user device data data 11 from the plurality of base stations 21, the number of handovers between neighboring base stations 21, and the information of the base station 21 measurement environment scan The group base station 20 establishes a group base station list 31 for optimizing the transmission power and antenna pattern of the group base station 20.

At the same time, the network controller 30 can instruct the plurality of base stations 21 in the group base station 20 to switch their antenna beam directions one by one or sequentially to multiple (eg, three) different antenna beam directions according to the group base station list 31 Each of them is used by the network controller 30 to collect user device data 11 in a plurality of different antenna beam directions for a period of time or enough. The network controller 30 can adjust the transmission power of the collected user device data 11 and the multiple base stations 21 A sorted list 32 of the transmission power of the group base station 20 and the antenna pattern or antenna beam direction is established over the entire range, and the network controller 30 calculates the number of base stations 21 (base station cells) in the group base station 20 The number of people served and the degree of load, find the best solution from the sorted list 32 of the transmission power of the group base station 20 and the antenna field pattern or antenna beam direction, for the network controller 30 to instruct multiple base stations 21 to jointly adjust their The best solution is to transmit power and antenna pattern or beam radiation direction.

The user device 10 may be a smart phone, a smart watch, a tablet computer, a notebook computer, or the like. The network controller 30 can be a self-organizing network (Self-Organizing Network, SON) controller, etc., and the network controller 30 is not limited to a single physical network element, as long as it can provide such a centralized processing computing network The elements are included in the definition category of the network controller 30.

The user device data 11 periodically reported by the multiple user devices 10 includes at least: the code name of the multiple base stations 21 (base station cells) in the group base station 20, and the antennas of the multiple base stations 21 radiate to the multiple user devices 10 The received signal strength value (eg, Reference Signal Receiving Power (RSRP)), the type of service communication of multiple user devices 10, etc. The report of the user device data data 11 can send the measured wireless measurement report (Measurement Report, MR) to the base station 21 and then to the network controller 30 through multiple user devices 10, or in multiple user devices 10 Install the measurement software (APP), and then multiple user devices 10 report the measured received signal strength value (RSRP) and the user device data 11 to the network controller 30.

Taking an application scenario as an example, when multiple (eg, n) base stations 21 (base station cells) in a group of base stations 20 are adjacent, each base station 21 (base station cell) has a type of smart Antenna system, this type of smart antenna system has multiple fixed fields or multiple fixed antennas For the beam direction, one or more specific beams can be selected from multiple antenna patterns or antenna beam directions for transmission and reception.

In the prior art antenna scanning method, if a smart antenna system such as each base station antenna system can switch m different beam radiation directions, there should be m to the nth power in the wireless environment of this group of base stations (I.e. m ⁿ ) possible solutions of various antenna field patterns or antenna beam directions, where m and n are positive integers. However, the present invention can escape from the prior art antenna scanning method, which requires m-th power (ie m ⁿ ) of base station antenna switching or scanning to find the best solution for the antenna field pattern or antenna beam direction.

In other words, the present invention can reduce the number of times the group base station 20 needs to switch or scan the antenna for wireless environment optimization to only m times, by periodically and centrally acquiring multiple bases in the same group base station 20 Under the station 21, the user device data 11 reported by the user device 10 is used as a basis, and then according to the adjustable range of the transmission power of the base station 21 (base station cell), the network controller 30 cross-calculates the antenna of the group base station 20 Various possible solutions of the field pattern are related to the received signal strength value (RSRP) and signal-to-noise ratio (such as Signal to Interference plus Noise Ratio (SINR)) of multiple user devices 10 after the adjustment of the transmission power , And sort the average signal-to-noise ratio (SINR) of multiple user devices 10 in various possible solutions (such as sorting from large to small), so that the transmission power and antenna pattern corresponding to the large to small average signal-to-noise ratio may be De-sorting to create a sorted list 32 of the transmission power of the group base station 20 with the best wireless signal quality and the antenna pattern or antenna beam direction.

The network controller 30 can estimate the sorted list 32 of the transmission power and the antenna pattern or antenna beam direction at the group base station 20 based on the user device service traffic type in the user device data data 11 etc. The base station in the possible solution of each antenna beam direction The number of servings of 21 and the degree of loading, and excluding the possible solution of the number of servings of the base station 21 is too small or the load is too low, you can choose from the sorted list 32 of the transmission power of the group base station 20 and the antenna pattern or antenna beam direction Find the best solution. After optimizing the quality of the wireless signal, the optimization of the system capacity is also completed, which can greatly improve the spectrum efficiency of the base station 21 (base station cell), thereby improving the transmission rate of the user device 10 and the user's experience.

The network controller 30 can adjust the transmission power of multiple base stations 21 and the antenna pattern or beam radiation direction through an algorithm and control commands, and then collectively adjust the transmission power of multiple base stations 21 in the group base station 20 It is compatible with the antenna pattern or beam radiation direction, so a better wireless signal coverage can be planned to avoid coverage holes, overlapping coverage, or too far coverage in the network environment of densely deployed base stations 21 (base station cells) occur. At the same time, the adjustment of the antenna pattern can include the adjustment of the antenna's radiation pattern (such as Half Power Beam width (HPBW)), the adjustment of the antenna beam direction (downtilt angle or horizontal direction), or a combination of the two The adjustment of the antenna radiation pattern in various ways.

FIG. 2 is a schematic diagram of three different antenna beam directions that can be switched in a smart antenna system such as a base station 21 (base station cell) of the present invention.

Taking an application scenario as an example, it includes multiple adjacent base stations 21 (such as four base stations BS_A, BS_B, BS_C, and BS_D). The wireless operating frequency of the four base stations 21 is 2600 MHz (megahertz). It is located at a height of 3.4 meters. The initial transmission power of the four base stations 21 is 27 dBm (decibel milliwatts). Each base station 21 has a type of smart antenna system with three different antennas. The beam direction, such as the first antenna beam direction (such as Sector_i direction), the second antenna beam direction (such as Sector_j direction), and the third antenna beam direction (such as Sector_k direction) shown in Figure 2, can be different from three Antenna beam direction Select a specific antenna beam direction for transmission and reception.

FIG. 3 is a schematic diagram of the initial antenna beam directions of multiple base stations 21 of the present invention all being the first antenna beam direction (such as the Sector_i direction), please refer to FIG. 2 together.

FIG. 4 is a schematic flowchart of a method for joint optimization of group base station transmit power and antenna pattern of the present invention, and FIGS. 5A to 5C are network controller 30 of the present invention instructing a plurality of group base stations 20 A schematic diagram of the base station 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) switching its antenna beam direction to, for example, the same antenna beam direction. FIG. 6 is the transmission power and antenna of the group base station 20 in the present invention For the sorting list 32 of field patterns or antenna beam directions, please refer to FIGS. 1 to 3 together.

The group base station transmission power and antenna pattern joint optimization method of the present invention mainly includes: (1) multiple user devices 10 report user device data 11 to multiple base stations 21 or network controllers 30, and the multiple Each base station 21 receives the user device data data 11 reported by the multiple user devices 10 for the multiple base stations 21 to report the user device data data 11, the number of handovers between neighboring base stations 21, and the measurement environment of the base station 21 Scanned information to the network controller 30; (2) At least one network controller 30 according to user device data data 11 from multiple base stations 21, the number of handovers between neighboring base stations 21 and the base station 21 Measure the information scanned by the environment and divide multiple base stations 21 into at least one group of base stations 20 to establish a group of base stations list 31 for optimizing the transmission power and antenna pattern of the group base stations 20; (3) According to the group base station list 31, the network controller 30 instructs the plurality of base stations 21 in the group base station 20 to switch their antenna beam directions one by one or sequentially to each of a plurality of different antenna beam directions for The network controller 30 collects user device data 11 for a period of time or enough under multiple different antenna beam directions; (4) The network controller 30 is based on the collected user device data 11 and multiple base stations The adjustable range of the transmission power of 21 establishes a sorted list 32 of the transmission power of the group base station 20 and the antenna field pattern or antenna beam direction 32; (5) The transmission power and antenna of the group base station 20 from the network controller 30 Find the best solution in the sorted list 32 of field patterns or antenna beam directions; (6) The network controller 30 instructs multiple base stations 21 to jointly adjust their transmission power and antenna field pattern or beam radiation direction to the best solution.

For example, in step S1 of FIG. 4, the user device 10 connected within the service range of the multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) shown in FIG. 3 periodically reports back to the user The device data 11 (see FIG. 1) is given to multiple base stations 21 or network controllers 30. Multiple base stations 21 (e.g., four base stations BS_A, BS_B, BS_C, BS_D) can receive user device data information 11 periodically reported by multiple user devices 10, and combine the user device data information 11 with neighboring base stations 21 The number of inter-delivery times and the information of the base station 21's measurement environment scan (REM) (such as the received signal strength value between adjacent base stations 21)... etc. are reported to the network controller 30.

In step S2 of FIG. 4, the network controller 30 of FIG. 1 can scan based on the user device data data 11 from multiple base stations 21, the number of handovers between neighboring base stations 21 and the measurement environment scan (REM ) To determine the information, divide multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) into at least one group of base stations 20 to establish a group of base stations 20 A list of base stations in a group of joint optimization of the transmission power and antenna field pattern 31.

In step S3 of FIG. 4, the network controller 30 of FIG. 1 may instruct the plurality of base stations 21 in the group base station 20 according to the group base station list 31 to switch their antenna beam directions one by one or one by one Each of the different antenna beam directions for the network controller 30 Collect user device data 11 for a period of time or enough in multiple different antenna beam directions.

For example, the network controller 30 may instruct a plurality of base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) in the group base station 20 shown in FIG. The beam direction is switched to the first antenna beam direction (such as the Sector_i direction in Figure 5A, but it can also be the Sector_j direction in Figure 5B, the Sector_k direction in Figure 5C or other directions) to be collected in the first antenna A period of time in the beam direction (eg, Sector_i direction) or sufficient user device data 11.

When the data of each user device 10 served under the group base station 20 measures a sufficient number of user devices 10 to the group base station 20, each base station 21 is in the direction of the first antenna beam (e.g. Sector_i direction) received signal strength value (RSRP), and when reported back to the network controller 30, the network controller 30 can instruct the plurality of base stations 21 in the group base station 20 according to the group base station list 31 (such as Four base stations BS_A, BS_B, BS_C, BS_D), the first antenna beam direction of multiple base stations 21 is switched to the second antenna beam direction (such as Sector_j direction in FIG. 5B, but it can also be the first (Sector_i direction in FIG. 5A, Sector_k in FIG. 5C or other directions) to collect user device data 11 for a period of time or enough in the second antenna beam direction.

Similarly, when a period of time is collected until the data of each user device 10 measures a sufficient number of user devices 10 against the group of base stations 20, each base station 21 (eg, base stations BS_A, BS_B, BS_C, BS_D) When the received signal strength value (RSRP) in the second antenna beam direction (eg, Sector_j direction) is reported to the network controller 30, the network controller 30 instructs the plurality of base stations 21 in the group base station 20 ( Such as four base stations BS_A, BS_B, BS_C, BS_D), the second antenna beam direction of multiple base stations 21 is switched to the third antenna beam direction (such as the Sector_k direction in Figure 5C, but it can also be the Sector_i direction in Figure 5A, Sector_j in Figure 5B) Direction or other directions) to collect user device data 11 in the third antenna beam direction for a period of time or enough. When data is collected for a period of time until a sufficient number of user devices 10 are measured in the group of base stations 20, each base station 21 (eg, base stations BS_A, BS_B, BS_C, BS_D) is in the third When the received signal strength value (RSRP) in the antenna beam direction (eg Sector_k direction) is reported to the network controller 30, the collection of the received signal strength value (RSRP) and the user device data 11 can be completed.

In short, the network controller 30 will instruct multiple base stations 21 in the group base station 20 to switch or scan three different antenna beam directions, and transmit the received signal strength value (RSRP) and the user device data 11 through The base station 21 may directly report to the network controller 30. The network controller 30 may obtain each user device 10 for a plurality of base stations 21 (such as four base stations BS_A, BS_B, BS_C, and BS_D) in three different Received signal strength value (RSRP) in the antenna beam direction (eg Sector_i, Sector_i, Sector_k). Since the network controller 30 can instruct a plurality of base stations 21 to switch to a certain antenna beam direction to measure and collect user device data 11, the antenna switching or scanning of the group base station 20 only needs to be performed three times. The aforementioned user device data 11 may include: the codes of a plurality of base stations 21 (base station cells) in the group base station 20 and their received signal strength values (such as _{RSRP_BS_A} , _{RSRP_BS_B} , RSRP_ _{BS_C, RSRP_ BS_D} ...), type of user device service-traffic-related information 10 ... and so on.

The base station 21 can also send base station information and load information to the network controller 30, including: (1) the identification code of the base station 21 (base station cell), such as CID, serial number (Serial number) etc. (2) The transmit power of the base station 21 (base station cell), such as TX power and reference signal power. (3) The adjustable range of the transmit power of the base station 21 (base station cell), for example, ΔTX: -20dB~0dB. (4) UL/DL total PRB utilization% (UL/DL total PRB utilization %). (5) Average/Max active UE number on the UL/DL. (6) Average/Max UL/DL cell throughput (Average/Max UL/DL cell throughput) related parameters.

In step S4 of FIG. 4, the network controller 30 of FIG. 1 can generate different antenna beam directions of multiple base stations 21 (eg, four base stations BS_A, BS_B, BS_C, BS_D) in the group base station 20 (For example, Sector_i, Sector_j, Sector_k three directions), there are three possible solutions to the antenna beam direction of the group base station 20 of three to the fourth power (ie 3 ⁴ =81). For each antenna beam direction Possibly, the network controller 30 obtains the adjustable range ΔTX of the transmission power of the multiple base stations 21 (ΔTX=0dB, -5dB, -10dB in this embodiment) and the multiple base stations 21 from the above step S3 Before adjusting the transmission power, each user equipment 10 can calculate the received signal strength value (RSRP) of multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, and BS_D) in different antenna beam directions. Under the possible solution of the antenna beam direction, after the transmission power of multiple base stations 21 is adjusted, the received signal strength of each user device 10 to multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) Value (RSRP).

Possible solution for one of the antenna beam directions of the group base station 20, for example, the antenna beam direction of the base station BS_A is Sector_i, the antenna beam direction of the base station BS_B is Sector_i, and the antenna beam of the base station BS_C is Sector_j, and the base station BS_D The antenna beam direction is Sector_k. It is known from the above step S3 that before the transmission power of the base station 21 is adjusted, the received signal of a certain user equipment 10 to multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) strength _{(RSRP_ BS_A_Sector_i, RSRP_ BS_B_Sector_i, RSRP_} BS_C_Sector_j, RSRP_ BS_D_Sector_k), the controller 30 may calculate a plurality of network base stations 21 after the transmission power is adjusted, a plurality of base stations 10 pairs of user equipment 21 (e.g., four bases Taiwan BS_A, BS_B, BS_C, BS_D) received signal strength _{(RSRP_after_ BS_A_Sector_i, RSRP_after_BS_ B_Sector_i, RSRP_after_} BS_C_Sector_j, RSRP_after_BS_ D_Sector_k), as in the following equation (1) to equation (4) shown in FIG.

Formula (1): RSRP_after_ _{BS_A_Sector_i} [dBm]→RSRP_ _{BS_A_Sector_i} [dBm]+ΔTX_ _{BS_A} [dB]

Formula (2): RSRP_after_ _{BS_B_Sector_i} [dBm]→RSRP_ _{BS_B_Sector_i} [dBm]+ΔTX_ _{BS_B} [dB]

Formula (3): RSRP_after_ _{BS_C_Sector_j} [dBm]→RSRP_ _{BS_C_Sector_j} [dBm]+ΔTX_ _{BS_C} [dB]

Formula (4): RSRP_after_ _{BS_D_Sector_k} [dBm]→RSRP_ _{BS_D_Sector_k} [dBm]+ΔTX_ _{BS_D} [dB]

The network controller 30 compares the above formulas (1)(2)(3)(4), the largest of RSRP_after is RSRP_serving_after[W], and the rest are added in units of W to RSRP_deteceted_after[W] to calculate this user The signal-to-noise ratio (SINR) of the device 10 is the following formula, where ThermalNoise is the thermal noise in W.

max(min(10×log

,30),-10) SINR_after

max ( min ( 10× log

,30),-10)

The network controller 30 calculates the signal-to-noise ratio of each user device 10 of the plurality of base stations 20 in the group of base stations 20 after adjusting the transmit power under each possible antenna beam direction according to the above method ( SINR), and then sorted according to the average signal-to-noise ratio (SINR) of multiple user devices 10 (eg, sorted from large to small) to de-sort the possible transmission power and antenna pattern corresponding to the large to small average signal-to-noise ratio In order to establish a sorted list 32 of the transmission power of the group base station 20 and the antenna pattern or antenna beam direction for the best wireless signal quality, as shown in FIG. 6. Through the above calculation method, the network controller 30 instructs the antenna of the group base station 20 to perform only three handover scans, and can estimate three of the fourth powers (that is, 3 ⁴ =81) related to the group base station 20 Wireless signal quality with possible solution of antenna beam direction.

In step S5 of FIG. 4, the network controller 30 of FIG. 1 can estimate the group base station generated in the above step S4 according to the user device service traffic type in the user device data 11... 20. In the ranking list 32 of the transmission power and the antenna field pattern or antenna beam direction, the number of service persons and the load level of the base station 21 in each possible solution of the antenna beam direction are excluded to exclude the too few service persons or the load level of the base station 21 If the possible solution is too low, the best solution can be found from the sorted list 32 of the transmission power of the group base station 20 and the antenna pattern or antenna beam direction.

In step S6 of FIG. 4, the network controller 30 of FIG. 1 instructs multiple base stations 21 (such as four base stations BS_A, BS_B, BS_C, BS_D) to jointly adjust their transmission power and antenna pattern or beam radiation Direction to the best solution.

FIGS. 7A and 7B are graphs of simulation results of the average signal-to-noise ratio (SINR) of multiple user devices 10 before and after optimization according to the present invention, and FIG. 7C is a related label of FIGS. 7A and 7B. , Signal-to-noise ratio (SINR) and signal quality table.

The simulation results shown in Figures 7A to 7C, for example: make the base station 21 (such as BS_A) adjust the transmit power ΔTX=-10dB, adjust the antenna beam direction to Sector_k; make the base station 21 (such as BS_B) adjust the transmit power ΔTX=-10dB, adjust the antenna beam direction to Sector_k; make the base station 21 (such as BS_C) adjust the transmit power ΔTX=0dB, adjust the antenna beam direction to Sector_i; and make the base station 21 (such as BS_D) adjust the transmit power ΔTX=-10dB , Adjust the antenna beam direction to Sector_k. Compared with the initial state before calculation (such as the transmission power of the four base stations are 27 dBm, and the antenna beam direction is fixed in the Sector_i direction, after the optimization of the present invention, the average signal-to-noise ratio (SINR) of multiple user devices 10 ) From 10.6dB in Figure 7A (before optimization) to 24.7dB in Figure 7B (after optimization), and each base station 21 also eliminates the situation of too little load, thereby optimizing the quality and capacity of the wireless environment .

In summary, the system and method for joint optimization of group base station transmit power and antenna pattern of the present invention may have the following features, advantages, or technical effects:

1. The present invention can be applied to the network environment of multiple adjacent base stations. The network controller instructs the group of base stations to perform antenna switching and scanning a small number of times, based on the user device data reported periodically by the user device. Calculation, and the network controller calculates the number of base stations serving and the load level, can jointly adjust the transmission power of multiple base stations in the group base station and the antenna pattern or beam radiation direction, so that the group base station wireless The signal quality and capacity are optimized.

2. The present invention jointly adjusts the group base stations through a central network controller The transmission power of multiple base stations and the antenna pattern or beam radiation direction can optimize the wireless signal quality and capacity of the group of base stations, which can reduce the interference of wireless signals between adjacent base stations of the same frequency and increase the number of base stations. The spectrum efficiency improves the communication reception quality and transmission rate of the overall user device.

3. The invention can reduce the number of times the antennas of multiple base stations need to be switched or scanned to only m times (such as m switchable antenna field patterns or antenna beam directions), that is, the antenna field pattern of the group base station can be found Or the best solution for the antenna beam direction. That is, the method of the present invention that can escape from the prior art antenna scanning requires the m-th power (ie m ⁿ ) of base station antenna switching or scanning to find the best solution for the antenna field pattern or antenna beam direction Therefore, the present invention can greatly reduce the number and time cost of switching or scanning the antennas of multiple base stations.

The above-mentioned embodiments only exemplarily illustrate the principles, characteristics and effects of the present invention, and are not intended to limit the scope of the invention. Anyone who is familiar with this skill can do the above without departing from the spirit and scope of the present invention. The embodiment is modified and changed. Any equivalent changes and modifications made using the disclosure of the present invention should still be covered by the scope of the patent application. Therefore, the scope of protection of the rights of the present invention should be as listed in the scope of patent application.

1‧‧‧ Group base station transmission power and antenna pattern joint optimization system

10‧‧‧User device (UE)

11‧‧‧User device data

20‧‧‧ group base station

21‧‧‧ Base Station (BS)

30‧‧‧Network Controller

31‧‧‧ Group base station list

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Claims (17)

A group base station transmission power and antenna field type joint optimization system includes: a plurality of user devices reporting data data of the user device; a plurality of base stations receiving data data of the user device reported by the plurality of user devices, And can report the user device data, the number of handovers between neighboring base stations and the information scanned by the base station's measurement environment; and at least one network controller based on the user device data from the multiple base stations 3. The number of handovers between neighboring base stations and the information scanned by the base station's measurement environment to divide the multiple base stations into at least one group of base stations to establish the transmit power and antenna pattern for the group of base stations Optimized group base station list; wherein, the network controller sequentially instructs the plurality of base stations in the group base station to switch their antenna beam directions to multiple different antennas according to the group base station list Each of the beam directions for the network controller to collect the user device data in the different antenna beam directions for a period of time or enough; and wherein, the network controller is based on the collected user device data The data and the adjustable range of the transmission power of the plurality of base stations create a sorted list of the transmission power of the group of base stations and the antenna pattern or antenna beam direction, from the group of base stations' transmission power and antenna pattern or Find the best solution in the sorted list of antenna beam directions for the network controller to instruct the multiple base stations to jointly adjust their transmit power and antenna pattern or beam radiation direction to the best solution. The system as described in item 1 of the patent application scope, wherein the plurality of user devices periodically report the user device data to the plurality of base stations or the network controller, and the user device data include the group The code name of the multiple base stations in the base station group, the multiple base stations The antenna of the platform radiates to the received signal strength value on the plurality of user devices, or the type of service traffic of the user devices. The system as described in item 1 of the patent application scope, wherein each of the plurality of base stations has a type of smart antenna system, and the type of smart antenna system has a plurality of fixed field patterns or a plurality of fixed antenna beam directions. The system as described in item 1 of the patent application scope, wherein the network controller sequentially instructs the plurality of base stations in the group of base stations to switch their antenna beam directions to the first antenna beam direction, Switch to the second antenna beam direction and switch to the third antenna beam direction together for the network controller to collect the first antenna beam direction, the second antenna beam direction and the third antenna A period of time under the beam direction or enough data data of the user device. The system as described in item 1 of the patent application scope, wherein the network controller calculates the number of service persons and the load level of the plurality of base stations in the group of base stations, based on the number of service persons and the number of service of the plurality of base stations The load level optimizes the wireless signal quality and capacity of the group of base stations. The system as described in item 1 of the patent application scope, wherein the network controller further calculates various possible solutions of the transmission power of the group of base stations and the antenna pattern, so as to include the various possible solutions in the multiple users The average signal-to-noise ratio of the device is sorted so that the network controller can establish a sorted list of the transmission power of the group of base stations and the antenna pattern or antenna beam direction according to the sorted average signal-to-noise ratio. The system as described in item 1 of the patent application scope, wherein the network controller further excludes those with too few service bases or too low load of the multiple base stations according to the user device service traffic type in the user device data Possible solutions to find the best solution from the sorted list of transmit power of the group of base stations and antenna pattern or antenna beam direction. The system as described in item 1 of the patent application scope, wherein the network controller further adjusts the transmission power of the plurality of base stations and the antenna pattern or beam radiation direction with control commands, and then jointly adjusts the group in a centralized manner The transmission power of the multiple base stations in the base station and the antenna pattern or beam radiation direction. A joint optimization method for group base station transmission power and antenna pattern includes: multiple user devices reporting user device data, and multiple base stations receiving the user device data reported by the multiple user devices, to For the plurality of base stations to report the data data of the user equipment, the number of handovers between neighboring base stations and the information scanned by the base station measurement environment; at least one network controller based on the user equipment from the plurality of base stations The data, the number of handovers between neighboring base stations and the information of the base station's measurement environment scan, divide the multiple base stations into at least one group of base stations to establish the transmission power and antenna for the group of base stations Field-optimized list of a group of base stations; the network controller instructs the base stations in the group of base stations to switch their antenna beam directions to multiple different Each of the antenna beam directions for the network controller to collect the user device data in the different antenna beam directions for a period of time or sufficient; the network controller according to the collected user device data Establish an ordered list of the transmission power of the group of base stations and the antenna pattern or antenna beam direction with the adjustable range of the transmission power of the plurality of base stations; the network controller Find the best solution in the sorted list of antenna field patterns or antenna beam directions; and the network controller instructs the multiple base stations to jointly adjust their transmit power and antenna field pattern or Beam radiation direction to this optimal solution. The method according to item 9 of the patent application scope, wherein the plurality of user devices periodically report the user device data to the plurality of base stations or the network controller, and the user device data include the group The codes of the plurality of base stations in the group of base stations, the received signal strength values of the antennas of the plurality of base stations radiated to the plurality of user devices, or the type of service traffic of the user devices. The method as described in item 9 of the patent application range, wherein each of the plurality of base stations has a type of smart antenna system, and the type of smart antenna system has a plurality of fixed field patterns or a plurality of fixed antenna beam directions. The method as described in item 9 of the patent application scope, wherein the network controller sequentially instructs the plurality of base stations in the group of base stations to switch their antenna beam directions to the first antenna beam direction, Switch to the second antenna beam direction and switch to the third antenna beam direction together for the network controller to collect the first antenna beam direction, the second antenna beam direction and the third antenna A period of time under the beam direction or enough data data of the user device. The method as described in item 9 of the patent application scope, wherein the network controller calculates the number of service persons and the load level of the plurality of base stations in the group of base stations, based on the number of service persons and the number of service of the plurality of base stations The load level optimizes the wireless signal quality and capacity of the group of base stations. The method as described in item 9 of the patent application scope, wherein the network controller calculates various possible solutions of the transmission power of the group of base stations and the antenna pattern to include the various possible solutions in the multiple user devices The average signal-to-noise ratio is sorted so that the network controller can create a sorted list of the transmission power of the group of base stations and the antenna pattern or antenna beam direction according to the sorted average signal-to-noise ratio. The method as described in item 9 of the patent application scope, wherein the network controller excludes the possibility that the number of service bases of the plurality of base stations is too small or the load is too low according to the user device service traffic type in the user device data Solution to find the best solution from the ordered list of the transmit power of the group of base stations and the antenna pattern or antenna beam direction. The method as described in item 9 of the patent application scope, wherein the network controller adjusts the transmission power of the plurality of base stations and the antenna pattern or beam radiation direction with control commands, and then jointly adjusts the group base in a centralized manner The transmission power of the multiple base stations in the station and the antenna pattern or beam radiation direction. A network controller for joint optimization of group base station transmission power and antenna pattern, including: at least one network controller, based on user device data from multiple base stations, between adjacent base stations The number of handovers and the information of the base station measurement environment scan to divide the multiple base stations into at least one group of base stations to create a group of base station lists for the optimization of the transmission power and antenna pattern of the group of base stations Where the network controller instructs the plurality of base stations in the group of base stations to switch their antenna beam directions to each of a plurality of different antenna beam directions one by one according to the group base station list, to For the network controller to collect the user equipment data in the different antenna beam directions for a period of time or enough; and wherein the network controller is based on the collected user equipment data and the plurality of base stations The adjustable range of the transmit power establishes a sorted list of the transmit power of the group of base stations and the antenna pattern or antenna beam direction to find from the sorted list of the transmit power of the group of base stations and the antenna pattern or antenna beam direction The best solution for the network controller to instruct the multiple bases The platform jointly adjusts its transmission power and antenna pattern or beam radiation direction to the optimal solution.

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