CN112996095A

Movatterモバイル変換

Info

Publication number: CN112996095A
Application number: CN201911297889.3A
Authority: CN
Inventors: 黄伟; 鲜柯; 王亮
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-06-18
Anticipated expiration: 2039-12-17
Also published as: CN112996095B

Abstract

The application discloses a base station self-adaptive downlink power adjustment method, which comprises the following steps: the base station determines a first uplink loss threshold TH1 according to the saturation power of the terminal, the transmitting power of the base station and the cell bandwidth; calculating a second uplink path loss threshold TH2 according to the maximum uplink path loss of the allowed terminal; the base station periodically calculates the current path loss information of each terminal in the cell aiming at the cell; comparing the current path loss information of each terminal with the first uplink path loss threshold TH1 and the second uplink path loss threshold TH2, and if the current path loss information of any terminal is less than TH1 and the current path loss information of no terminal is greater than TH2, reducing the downlink transmission power of the cell when the transmission power of the cell is allowed to be reduced; otherwise, the transmitting power of the cell is unchanged. By applying the method and the device, the problem of downlink power saturation in a base station scene can be solved.

Description

Base station self-adaptive downlink power adjustment method

Technical Field

The present application relates to power adjustment techniques in communication systems, and in particular, to a method for adjusting downlink power adaptively in a base station.

Background

In current base stations, a fixed transmission power is generally adopted to transmit downlink signals. However, this downlink transmission scheme may have problems for the base station in some cases.

In particular, in current practical applications, backpack base stations appear, which are small in size and can be carried on board or with them. For such a base station, a handheld or CPE terminal may be close to the base station, but the reception power of the terminal is limited, in this case, the reception power of the terminal in the downlink direction may exceed the limit of its own reception power, so that power saturation occurs, and further, traffic abnormality may occur.

Disclosure of Invention

The application provides a base station self-adaptive downlink power adjusting method which can solve the problem of downlink power saturation in a base station scene.

In order to achieve the purpose, the following technical scheme is adopted in the application:

a method for adjusting base station self-adaptive downlink power comprises the following steps:

the base station determines a first uplink loss threshold TH1 according to the saturation power of the terminal, the transmitting power of the base station and the cell bandwidth; calculating a second uplink path loss threshold TH2 according to the maximum uplink path loss of the allowed terminal;

the base station periodically calculates the current path loss information of each terminal in the cell aiming at the cell;

comparing the current path loss information of each terminal with the first uplink path loss threshold TH1 and the second uplink path loss threshold TH2, and if the current path loss information of any terminal is less than TH1 and the current path loss information of no terminal is greater than TH2, reducing the downlink transmission power of the cell when the transmission power of the cell is allowed to be reduced; otherwise, the transmitting power of the cell is unchanged.

Preferably, the calculating the current path loss information of each terminal in the cell includes:

the base station receives a power headroom PHR reported by a terminal, and is used for updating a maximum power spectral density Pc (i) of the terminal and calculating the current path loss information PL _ Uplink (Pmax-Pc (i)) -RSRP _ ul by using the Pc (i); wherein Pmax is a preset maximum power value, and RSRP _ ul is an uplink RSRP measurement value of RB level.

Preferably, the determining the first uplink loss threshold TH1 includes:

and taking the difference between the preset fixed transmission power of the base station and the terminal saturation power on the RB level as the first uplink loss threshold.

Preferably, the calculating the second uplink loss threshold TH2 includes:

and taking the difference between the maximum path loss of the allowed UE and a preset offset value as the second uplink path loss threshold.

Preferably, the reducing the downlink transmission power of the cell includes:

the reduction value of the downlink transmitting power is as follows: the difference between the current path loss information of any of the terminals and TH 1.

Preferably, if there are a plurality of terminals with current path loss information smaller than TH1, selecting a terminal with the smallest current path loss information, and taking the difference between the current path loss information of the selected terminal and TH1 as the reduction value of the downlink transmission power.

According to the technical scheme, in the application, the first uplink loss threshold TH1 is determined in advance according to the saturation power of the terminal, the transmitting power of the base station and the cell bandwidth; calculating a second uplink path loss threshold TH2 according to the maximum uplink path loss of the allowed terminal; the base station periodically calculates the current path loss information of each terminal in the cell aiming at the cell; . Comparing the current path loss information of each terminal with a first uplink path loss threshold TH1 and a second uplink path loss threshold TH2, and if the current path loss information of any terminal is less than TH1 and the current path loss information of no terminal is greater than TH2, reducing the downlink transmission power of the cell when the transmission power of the cell is allowed to be reduced; otherwise, the transmission power of the cell is unchanged. In the mode, the terminal reaching the saturation power is determined through the first uplink loss threshold, and the terminal receiving a weaker signal is determined through the second uplink loss threshold; and when the terminal reaching the saturation power exists and the terminal with weak received signals does not exist, reducing the transmitting power so as to ensure that the power of the terminal is not saturated any more and avoid causing abnormal service.

Drawings

Fig. 1 is a basic flowchart of a power adjustment method according to the present application.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic basic flow chart of a power adjustment method in the present application, as shown in fig. 1, the method includes:

step 101, determining a first uplink loss threshold TH1 according to the saturation power of a terminal, the transmitting power of a base station and the cell bandwidth; and calculating a second uplink loss threshold TH2 according to the maximum uplink loss of the allowed terminal.

The processing of calculating TH1 and TH2 in this step may be performed in advance without recalculation each time whether the calculated power needs to be adjusted. The first uplink loss threshold TH1 is related to the saturation power of the terminal, and is used for determining whether the terminal reaches the saturation power; the second uplink path loss threshold TH2 is associated with the maximum path loss allowed by the terminal, and is used to determine whether there is a terminal in the cell whose received signal is weak and which would affect the receiving performance if the receiving power is reduced.

The manner of determining the first uplink loss threshold TH1 may include: and taking the difference between the preset fixed transmission power of the base station and the terminal saturation power on the RB level as a first uplink loss threshold. Specifically, the fixed transmission power of the base station is in RB level, and the saturation power of the terminal is generally full bandwidth, so generally, it is necessary to first convert the saturation power of the terminal into the saturation power of the terminal in RB level according to the cell bandwidth, and then calculate the difference with the fixed transmission power of the base station, and take the difference as TH 1.

The manner of calculating the second uplink loss threshold TH2 may include: and taking the difference between the maximum path loss of the allowed UE and a preset offset value as a second uplink path loss threshold. The maximum allowed path loss of the UE is usually fixed, and is generally determined by the device capability of the radio frequency hardware of the base station, and the offset value may be set empirically.

Step 102, the base station periodically calculates the current path loss information of each terminal in the cell aiming at the cell.

Wherein, preferably, the calculation period may be set to 5 s.

The way of calculating the current path loss information may be:

the base station receives a Power Headroom (PHR) reported by the terminal, calculates an updated maximum power spectral density Pc (i) by using the PHR, and then calculates current path loss information PL _ Uplink (Pmax-Pc (i)) -RSRP _ ul by using Pc (i). Wherein max is a preset maximum power value, RSRP _ ul is an uplink RSRP measurement value of RB level, and i is a PHR reporting number index.

Step 103, comparing the current path loss information of each terminal with the first uplink path loss threshold TH1 and the second uplink path loss threshold TH 2.

And 104, judging whether the current path loss information of the terminal in the cell is smaller than a first uplink path loss threshold, if so, executing astep 105, otherwise, executing astep 108.

As described above, the first uplink loss threshold TH1 is used to determine whether there is a terminal reaching the saturation power in the cell, specifically, if the current path loss information of the terminal is less than the first uplink loss threshold, it indicates that the terminal has reached the saturation power, and it is necessary to reduce the power; if no terminal in the cell reaches saturation power, then it may not be necessary to reduce the power.

And 105, judging whether the current path loss information of the terminal in the cell is larger than a second uplink path loss threshold, if so, executing astep 108, otherwise, executing astep 106.

As described above, the second uplink loss threshold TH2 is used to determine whether there is a terminal in the cell whose received signal is weak and whose reception performance is affected if the base station reduces the transmission power. Specifically, if the current path loss information of the terminal is greater than the second uplink path loss threshold, it indicates that the path loss of the terminal (for example, the terminal located at the edge of the cell) has reached the limit, and if the transmission power of the base station is further reduced, the path loss of the terminal is inevitably further reduced, which may seriously affect the receiving performance, and in this case, the power cannot be reduced any more. If no such terminal is present in the cell, further power reduction may be considered.

Step 106, determining whether the transmission power of the base station is allowed to be further reduced, if yes, executingstep 107 to reduce the transmission power, otherwise, executingstep 108.

The base station transmitting power has a basic range limit, and can not be infinitely reduced, the base station transmitting power is judged to be allowed to be further reduced, and if the base station transmitting power is not allowed, the transmitting power can not be reduced when the terminal reaches the saturation power.

Step 107, reducing the transmitting power of the cell.

The reduction in transmit power may be: the difference between the current path loss information of the terminal reaching the saturation power and the first uplink path loss threshold TH 1. If a plurality of terminals reach the saturation power, the terminal with the largest current path loss information can be selected from the terminals reaching the saturation power, and the difference between the current path loss information of the terminal and TH1 is used as the reduction value of the transmission power.

Step 108, the existing transmitting power of the cell is kept unchanged.

The power adjustment method in the present application is ended.

In the technical scheme, the maximum downlink path loss allowed by the terminal is calculated through the cell transmitting power and the terminal saturation power, the base station periodically calculates the path loss of all terminals in the cell, and the downlink power is adaptively adjusted according to the allowed path loss, so that the transmitting power is reduced as much as possible when the terminal reaching the saturation power appears, the terminal power is not saturated any more, and the abnormal service caused by the terminal reaching the saturation power is avoided.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for adjusting adaptive downlink power of a base station is characterized by comprising the following steps:

2. The method of claim 1, wherein the calculating the current path loss information of each terminal in the cell comprises:

3. The method of claim 1, wherein the determining the first uplink loss threshold TH1 comprises:

4. The method of claim 1, wherein the calculating the second uplink loss threshold TH2 comprises:

5. The method of claim 1, wherein the reducing the downlink transmit power of the cell comprises:

6. The method of claim 5, wherein if there are a plurality of terminals with current path loss information less than the TH1, selecting a terminal with the smallest current path loss information, and using the difference between the current path loss information of the selected terminal and the TH1 as the downlink transmission power reduction value.