CN112996095B - Self-adaptive downlink power adjustment method for base station - Google Patents
Self-adaptive downlink power adjustment method for base stationDownload PDFInfo
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- CN112996095B CN112996095BCN201911297889.3ACN201911297889ACN112996095BCN 112996095 BCN112996095 BCN 112996095BCN 201911297889 ACN201911297889 ACN 201911297889ACN 112996095 BCN112996095 BCN 112996095B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
Description
Technical Field
The present disclosure relates to power adjustment techniques in communication systems, and in particular, to a base station adaptive downlink power adjustment method.
Background
In the current base station, the downlink signal is generally transmitted with a fixed transmission power. However, this downlink transmission method may be problematic for the base station in some cases.
In particular, in the current practical application, a knapsack base station appears, and the base station has small volume and can be carried on-board or with a person. For such base stations, the handheld or CPE terminal may be very close to the base station, however, the reception power of the terminal is limited, in which case the reception power of the downlink terminal may exceed the limit of its own reception power, so that power saturation occurs, and thus, the traffic may be abnormal.
Disclosure of Invention
The application provides a self-adaptive downlink power adjustment method for a base station, which can overcome the problem of downlink power saturation in a base station scene.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a base station self-adaptive downlink power adjustment method comprises the following steps:
the base station determines a first uplink path loss threshold TH1 according to the saturated 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 smaller than the TH1 and the current path loss information of no terminal is larger than the 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 margin PHR reported by a terminal, and is used for updating the maximum power spectrum 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 measured value of RB level.
Preferably, the determining the first uplink path loss threshold TH1 includes:
and taking the difference between the preset base station fixed transmitting power and the terminal saturated power on the RB level as the first uplink path loss threshold.
Preferably, the calculating the second uplink path loss threshold TH2 includes:
and taking the difference between the maximum allowed path loss of the 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: and the difference between the current path loss information of any terminal and TH1.
Preferably, if the number of the terminals whose current path loss information is smaller than TH1 is plural, one terminal whose current path loss information is the smallest is selected, and the difference between the current path loss information of the selected terminal and TH1 is used as the reduction value of the downlink transmission power.
As can be seen from the above technical solution, in the present application, a first uplink path loss threshold TH1 is determined in advance according to saturated power of a terminal, transmitting power of a base station, and 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 smaller than TH1 and the current path loss information of no terminal is larger than TH2, reducing the downlink transmission power of a cell when the transmission power of the cell is allowed to be reduced; otherwise, the transmitting power of the cell is unchanged. By the method, the terminal reaching saturated power is determined through the first uplink path loss threshold, and the terminal with weaker received signal is determined through the second uplink path loss threshold; when a terminal reaching saturated power exists and a terminal with weak received signals does not exist, the transmitting power is reduced, so that the terminal power is not saturated any more, and service abnormality is avoided.
Drawings
Fig. 1 is a basic flow chart of a power adjustment method in the present application.
Detailed Description
In order to make the objects, technical means and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings.
Fig. 1 is a basic flow chart of a power adjustment method in the present application, as shown in fig. 1, the method includes:
The process of calculating TH1 and TH2 in this step may be performed in advance, and need not be recalculated each time it is necessary to adjust the calculation power. The first uplink path loss threshold TH1 is related to the saturated power of the terminal and is used for determining whether the terminal reaches the saturated power; the second uplink path loss threshold TH2 is related to the maximum path loss allowed by the terminal, and is used for determining whether a terminal with weak received signal and affected receiving performance if the received power is reduced exists in the cell.
The manner of determining the first uplink path loss threshold TH1 may include: and taking the difference between the preset base station fixed transmitting power and the terminal saturated power on the RB level as a first uplink path loss threshold. Specifically, the base station fixed transmission power is of RB level, and the saturation power of the terminal is generally of full bandwidth, so that it is generally necessary to convert the terminal saturation power into the terminal saturation power on RB level according to the cell bandwidth first, and then to make a difference with the base station fixed transmission power, and the difference is taken as TH1.
The calculating the second uplink path loss threshold TH2 may include: and taking the difference between the maximum allowed path loss of the UE and a preset offset value as a second uplink path loss threshold. The maximum path loss allowed for the UE is usually fixed, and is generally determined by the device capability of the radio frequency hardware of the base station, and the bias value may be set empirically.
Wherein, preferably, the calculation period may be set to 5s.
The way of calculating the current path loss information can be as follows:
and the base station receives a power margin (PHR) reported by the terminal, calculates updated maximum power spectrum density Pc (i) by using the PHR, and then calculates current path loss information PL_uplink=Pmax-Pc (i) -RSRP_ul by using the Pc (i). Wherein, max is the preset maximum power value, RSRP_ul is the RB-level uplink RSRP measured value, and i is PHR reporting frequency index.
Andstep 103, 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.
As mentioned above, the first uplink path loss threshold TH1 is used for determining whether a terminal reaching saturated power exists in the cell, specifically, if the current path loss information of the terminal is smaller than the first uplink path loss threshold, it indicates that the terminal has reached saturated power, and it is necessary to reduce the power; if no terminal in the cell reaches saturated power, then no power reduction may be necessary.
As described above, the second uplink loss threshold TH2 is used to determine whether there is a terminal in the cell where the received signal is weak, and the receiving performance of the terminal 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 cell edge) has reached the limit, and if the base station transmission power is further reduced, the path loss of the terminal must be further reduced, the receiving performance will be seriously affected, and in this case, the power cannot be reduced any more. If no such terminals are present in the cell, a further power reduction may be considered.
The base station transmitting power has a basic range limitation, and cannot be reduced infinitely, wherein the base station transmitting power is judged to be allowed to be further reduced, and if the base station transmitting power is not allowed to be further reduced, the terminal reaches saturated power in time, and the transmitting power cannot be reduced.
The reduction value of the transmission power may be: the difference between the current path loss information of the terminal reaching the saturated power and the first uplink path loss threshold TH1. If a plurality of terminals reach saturated power, one of the terminals with the maximum current path loss information can be selected from the terminals with the saturated power, and the difference between the current path loss information of the terminal and TH1 is used as a reduction value of the transmitting power.
Thus, the flow of the power adjustment method in the application is ended.
In the above technical solution, the maximum downlink path loss allowed by the terminal is calculated through the cell transmitting power and the terminal saturated power, and the base station periodically calculates the path loss of all the terminals in the cell, and performs downlink power self-adaptive adjustment according to the allowed path loss, so that when the terminal reaching the saturated power occurs, the transmitting power is reduced as much as possible, and the terminal power is not saturated any more, so as to avoid abnormal service caused by the terminal reaching the saturated power.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (6)
1. The self-adaptive downlink power adjustment method for the base station is characterized by comprising the following steps:
the base station determines a first uplink path loss threshold TH1 according to the saturated 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 smaller than the TH1 and the current path loss information of no terminal is larger than the 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;
the first uplink loss threshold TH1 is related to the saturated power of the terminal, and is used for determining whether the terminal reaches the saturated power; the second uplink path loss threshold TH2 is related to the maximum path loss allowed by the terminal, and is used for determining whether a terminal with weak received signal and affected receiving performance if the received power is reduced exists in the cell.
2. The method of claim 1, wherein the calculating current path loss information for each terminal in the cell comprises:
the base station receives a power margin PHR reported by a terminal, and is used for updating the maximum power spectrum 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 measured value of RB level.
3. The method of claim 1, wherein determining the first uplink loss threshold TH1 comprises:
and taking the difference between the preset base station fixed transmitting power and the terminal saturated power on the RB level as the first uplink path loss threshold.
4. The method of claim 1, wherein calculating the second uplink loss threshold TH2 comprises:
and taking the difference between the maximum allowed path loss of the UE and a preset offset value as the second uplink path loss threshold.
5. The method of claim 1, wherein the reducing the downlink transmit power of the cell comprises:
the reduction value of the downlink transmitting power is as follows: and the difference between the current path loss information of any terminal and TH1.
6. The method of claim 5 wherein if the current path loss information is less than the 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 transmit power.
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| CN201911297889.3ACN112996095B (en) | 2019-12-17 | 2019-12-17 | Self-adaptive downlink power adjustment method for base station |
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| CN116744424B (en)* | 2023-08-11 | 2023-11-10 | 深圳国人无线通信有限公司 | Base station power threshold alarming method and device |
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