CN110381571B

CN110381571B - Dynamic power adjustment method and system for LTE base station

Info

Publication number: CN110381571B
Application number: CN201910445918.XA
Authority: CN
Inventors: 刘宏飞; 朱延欣; 刘忠江
Original assignee: Beijing Tuoming Communication Technology Co ltd
Current assignee: Beijing Tuoming Communication Technology Co ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2022-08-16
Anticipated expiration: 2039-05-27
Also published as: CN110381571A

Abstract

The invention discloses a dynamic power adjustment method and a dynamic power adjustment system for an LTE (Long term evolution) base station, wherein the method comprises the following steps: step 101, judging whether each LTE cell in the LTE base station meets an adjustable condition, and if so, adding the LTE cell serving as a cell to be adjusted into a power adjustment cell list; step 102, in the set adjustable date and adjustable time, judging whether the cell to be adjusted in the power adjustment cell list is adjustable or not at intervals of an adjustment period, if so, performing power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, performing no adjustment, wherein the wireless network optimization parameter comprises: CRS reference signal power, PA, PB, number of transmit antennas, number of CRS ports, and carrier bandwidth. The method and the system provided by the invention can reduce the transmitting power of the base station as much as possible under the condition of ensuring that the coverage perception of the user is not changed when the service is idle by automatically combining and setting the open network optimization parameters so as to improve the overall energy efficiency level of the base station.

Description

Dynamic power adjustment method and system for LTE base station

Technical Field

The invention relates to the field of mobile communication, in particular to a dynamic power adjustment method and system for an LTE (Long term evolution) base station.

Background

An LTE base station is a radio transceiver station that performs information transfer with mobile phone terminals through a mobile communication switching center in a certain radio coverage area using OFDMA technology. Can reach dozens of times of TD-SCDMA technology, and makes ubiquitous high-speed internet access possible.

However, when the service is idle, for example, between 0:00 and 06:00, the PRB utilization rate of the LTE cell is low, and the number of connected users is also small, and under this condition, it is obviously more wasteful for an operator to provide the same base station transmission power as that in busy time, so there is an urgent need to provide a power adjustment method to monitor the cell service in real time, and under the condition that the user coverage perception is not changed when the service is idle, the base station transmission power is reduced as much as possible, and the overall energy saving goal of the communication operator is achieved, thereby achieving sustainable development.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a dynamic power adjustment method and a dynamic power adjustment system for an LTE (long term evolution) base station.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a dynamic power adjustment method for an LTE base station comprises the following steps:

(1) judging whether each LTE cell in the LTE base station meets an adjustable condition, if so, adding the LTE cell serving as a cell to be adjusted into a power adjustment cell list;

(2) judging whether the cells to be adjusted in the power adjustment cell list are adjustable or not at intervals of an adjustment period within a set adjustable date and adjustable time, if so, performing power adjustment on the cells to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, adjusting the wireless network optimization parameter, wherein the wireless network optimization parameter comprises: CRS reference signal power, PA, PB, number of transmit antennas, number of CRS ports, and carrier bandwidth.

Further, according to the dynamic power adjustment method for the LTE base station, the adjustable conditions are as follows: the PRB utilization rate of the continuous preset number of adjustment periods of the LTE cell in idle is lower than the preset PRB utilization rate, the number of RRC connection users is not higher than the preset number of RRC connection users, the carrier bandwidth is greater than 10M, and the number of CRS ports is greater than 1.

Further, in the above method for dynamically adjusting power of an LTE base station, in step (2), the determining, every adjustment period, whether a cell to be adjusted in the power adjustment cell list is adjustable includes:

in the current adjustment period, judging whether the cells to be adjusted in the power adjustment cell list simultaneously meet the conditions that the PRB utilization rate is lower than the preset PRB utilization rate and the RRC connection user number is not higher than the preset RRC connection user number;

if the bandwidth required to be adjusted by the cell to be adjusted reaches the preset amplitude, judging whether the bandwidth required to be adjusted by the cell to be adjusted reaches the preset amplitude, if so, adjusting the cell to be adjusted in the adjusting period, and if not, not adjusting the cell to be adjusted in the adjusting period.

Further, in the above method for dynamically adjusting power of an LTE base station, in step (2), performing power adjustment on a cell to be adjusted in the power adjustment cell list through an open radio network optimization parameter includes:

judging the sector type of the cell to be adjusted in the power adjustment cell list;

if the cell to be adjusted is a single-layer frequency point cell, reducing the cell to be adjusted to a first preset bandwidth, if the CRS port number of the cell to be adjusted is 1, finishing the adjustment, if the CRS port number of the cell to be adjusted is 2, reducing the CRS reference signal power, adjusting the CRS port number to 1, and finishing the adjustment;

if the cell to be adjusted belongs to a multi-layer frequency point sector, sequencing the cells in the sector according to the frequency, wherein the minimum frequency is a covering layer cell, and the other cells are thickness layer cells, sequentially adjusting the thickness layer cells according to the frequency from large to small, closing the thickness layer cell if the carrier bandwidth reduced by one thickness layer cell for a single time exceeds a second preset bandwidth, finishing the adjustment if the CRS port number of the covering layer cell is 1, reducing the CRS reference signal power and adjusting the CRS port number to 1 if the CRS port number of the covering layer cell is 2, and finishing the adjustment.

Further, in the above method for dynamically adjusting power of an LTE base station, the closing a cell is: and setting the CRS reference signal of the cell to be 0.1dBm, and adjusting the carrier bandwidth to be 5M.

A system for dynamic power adjustment of an LTE base station, comprising:

the adding module is used for judging whether each LTE cell in the LTE base station meets an adjustable condition or not, and if so, the LTE cell is used as a cell to be adjusted and added into the power adjustment cell list;

an adjusting module, configured to determine, every adjustment period, whether a cell to be adjusted in the power adjustment cell list is adjustable on a set adjustable date and at an adjustable time, if so, perform power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, the wireless network optimization parameter includes: CRS reference signal power, PA, PB, number of transmit antennas, number of CRS ports, and carrier bandwidth.

Further, as to the above dynamic power adjustment system for an LTE base station, the adjustable conditions are: the PRB utilization rate of the continuous preset number of adjustment periods of the LTE cell in idle is lower than the preset PRB utilization rate, the number of RRC connection users is not higher than the preset number of RRC connection users, the carrier bandwidth is greater than 10M, and the number of CRS ports is greater than 1.

Further, in the system for dynamically adjusting power of an LTE base station, the adjusting module is configured to determine, every adjustment period, whether a cell to be adjusted in the power adjustment cell list is adjustable, and the determining includes:

Further, in the system for dynamically adjusting power of an LTE base station, the adjusting module is configured to perform power adjustment on the cell to be adjusted in the power adjustment cell list through an open radio network optimization parameter, and the power adjustment includes:

Further, in the above dynamic power adjustment system for an LTE base station, the closing a cell is: and setting the CRS reference signal of the cell to be 0.1dBm, and adjusting the carrier bandwidth to be 5M.

The invention has the beneficial effects that: the method and the system provided by the invention can reduce the transmitting power of the base station as much as possible under the condition of ensuring that the user coverage perception is not changed when the service is idle by automatically combining and setting the open network optimization parameters, thereby improving the overall energy efficiency level of the base station, realizing the overall energy-saving target of a communication operator, reducing the operation cost, realizing sustainable development and being generally suitable for all LTE equipment manufacturers.

Drawings

Fig. 1 is a schematic flow chart of a method for dynamically adjusting power of an LTE base station according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an overall control flow of a method for dynamically adjusting power of an LTE base station according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a determination process of whether a cell to be adjusted is adjustable in each adjustment period according to an embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating adjustment according to an embodiment of the present invention;

fig. 5 is a schematic flow chart illustrating adjustment according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

Related concept:

1. RB (resource Block): resource allocation frequency domain minimum unit of physical layer data transmission, time domain: 1 slot, frequency domain: 12 consecutive subcarriers (Subcarrier), typically 84 physical resource elements, REs.

2. Carrier bandwidth: that is, the number of RBs available in the frequency domain dimension of the LTE cell, the larger the number of RBs, the wider the carrier bandwidth, and the total LTE supports 6 bandwidth settings, which are 1.4M (6RB), 3M (15RB), 5M (25RB), 10M (50RB), 15M (75RB), and 20M (100RB), respectively. Although 20M bandwidth is about 130% higher (at 2 x 2 mimo) than 10M bandwidth rate, 20M bandwidth power is 2 times that of 10 megabits of bandwidth and power consumption is multiplied to achieve the same degree of coverage.

3. CRS port number: that is, the cell uses dual stream or single stream, and the cell using CRS port 1 has a power amplifier total power completely consistent with that of the cell using CRS port number 2, but the cell using CRS port 1 is 3dB stronger in port power per antenna than the cell using CRS port number 2. In another aspect, if a single stream is used, the power of the RRU has a wattage that is only half of a cell with a CRS port number of 2 when the same coverage is achieved.

4. Reference signal power: in an LTE frame structure, the power of an RS-type RE located in 0 and 4 symbols in each PRB is obvious for LTE coverage, and RSRP refers to the total field strength power of the RE received by the UE, and the power setting provided by the mainstream equipment manufacturer is the parameter, but the actual signal strength of the user is perceived as "power per port", rather than the reference signal power.

5. Power per port: it is the value that is sent to the UE in the LTE external field test and SIB, and LTE network managers such as hua shi, zhongxing, ericsson, etc. do not directly provide the modification of the parameter, but obtain it through the calculation of the associated parameter, although the user mobile phone directly measures the reference signal power, the measured signal strength is often the final decision of the power of each port. When the reference signal power set by cell a is 3dB higher than that of cell B, but cell B has twice more transmission channels than cell a, then cell a and cell B have practically the same power per port. In addition, when the reference signal power set by the cell a is 3dB higher than that of the cell B, the number of reference signal ports of the cell B is set to 1, and the cell a is set to 2, the power per port of the cell a and the cell B is still consistent. The number of RRC connection users: i.e. the total number of users currently accessing a cell.

6. PRB utilization rate: the LTE actual minimum scheduling Time domain unit is tti (transmission Time interval), that is, 1ms, and corresponds to an RB Pair (RB Pair) consisting of 2 RBs in the Time domain, where the RBs are referred to by different names in the Physical layer and the MAC layer, and are Physical RBs (L1 concept of Time-frequency resources in the Physical layer). Therefore, the PRB utilization is defined as the ratio of the average value of the actually used PRBs of the enodeb downlink physical channel to the available PRBs of the enodeb downlink physical channel in the statistical period.

7. Wireless network optimization parameters: the wireless parameters which are opened by equipment manufacturers to network optimization and planning departments can be set for mainstream equipment manufacturers, and the setting meanings are the same. The energy-saving algorithm bypassing the proprietary of the manufacturer can be realized. The realization of the invention is totally dependent on the network optimization parameters of the open and universal network.

8. Sector and cell: the area in which one or more antennas are simultaneously directed is referred to as a sector, and each carrier within the sector that covers the same area is referred to as a cell.

9. Multilayer simultaneous coverage: LTE is different from the GSM system, and the GSM system only need increase TCH carrier wave quantity when expanding the capacity can, and original carrier frequency, BCCH all do not need the change, and the expansion is newly-increased and does not influence the coverage yet. One carrier of the LTE system is a cell, and therefore when the capacity of one carrier is not satisfied, one or more carriers with different frequencies need to be added in the coverage direction, and each carrier is an independent cell. These cells are referred to as co-coverage.

10. Covering thickness: the width of the electromagnetic spectrum covering the same geographical area is generally referred to as the coverage thickness, a 20M frequency bandwidth cell has a higher coverage thickness than a 10M frequency bandwidth, and an F + D coverage has a higher coverage thickness than an F single frequency point coverage. The thicker the coverage of a certain area, the greater the system capacity of that area, and the more users that can be carried.

11. And closing the cell: closing a cell in a general sense means deactivating a certain LTE cell to make the LTE cell completely unable to provide a service, but deactivating the cell may affect an existing fault assessment system due to a fallback assessment and the like, so that closing the cell in the algorithm means reducing a cell carrier bandwidth to 5M, adjusting a reference signal power to 0.1dBm, where a typical power consumption is 5 watts for an 8T8R cell, and is less than 1.3 watts for a 2T2R cell.

As shown in fig. 1, a method for dynamically adjusting power of an LTE base station includes:

step 101, judging whether each LTE cell in the LTE base station meets an adjustable condition, and if so, adding the LTE cell serving as a cell to be adjusted into a power adjustment cell list;

the adjustable conditions are as follows: the PRB utilization rate of the continuous preset number of adjustment periods of the LTE cell in idle is lower than the preset PRB utilization rate, the number of RRC connection users is not higher than the preset number of RRC connection users, the carrier bandwidth is greater than 10M, and the number of CRS ports is greater than 1.

As shown in fig. 2, an initial determination is first made as to whether or not a certain LTE cell satisfies all of the following conditions, and if both of them are satisfied, it is determined to be adjustable, and the adjusted LTE cell is placed in a power adjustment cell list.

a) And judging whether the PRB utilization rate of the cell in the continuous N _ T statistical periods (namely the adjustment period, such as 15 minutes) during idle time is lower than the PRB utilization rate PRB _ USER _ THD, and the number of the RRC connection USERs in the cell is not higher than UE _ NUM. N _ T15, PRB _ USER _ THD 10%, and UE _ NUM 10 may be set. Such a determination requires that the cell must be in a stable low-traffic state when the traffic is idle, and some cells with much traffic busy and idle changes in the early morning period are determined to be cells unsuitable for adjustment; from the first N _ D day of statistics, if N _ D-2 days exist from 0:00 to 06:15 that N _ T statistical periods per day (15 minutes per period) satisfy the above condition, it may be suggested that N _ D is 7, and the cell may be determined to be an idle low traffic and smooth cell.

b) The carrier bandwidth of a cell needs to be greater than 10M and the CRS port number is greater than 1.

And simultaneously satisfying a) to b), the LTE cell can be determined to be an adjustable cell, and the cell can be added into a power adjustment cell list as a cell to be adjusted, or the power adjustment cell list can be manually imported, and the cells in the list can be adjusted for energy conservation every day. The calculation evaluation can be selected once every weekend, and the cells meeting the conditions enter the daily energy-saving adjustment of the next week.

Energy-saving adjustment date setting:

a) can be set to adjust every day;

b) can be set to adjust for certain dates;

c) it can be set to adjust every day, but some special cases do not adjust the date, such as weekends, special holidays, etc.;

although a certain cell is determined to be an adjustable cell, the cell is not adjusted unless it is within the energy saving adjustment setting date.

Step 102, in the set adjustable date and adjustable time, judging whether the cell to be adjusted in the power adjustment cell list is adjustable or not at intervals of an adjustment period, if so, performing power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, performing no adjustment, wherein the wireless network optimization parameter comprises: CRS reference signal power, PA, PB, number of transmit antennas, number of CRS ports, and carrier bandwidth.

Judging whether the cell to be adjusted in the power adjustment cell list can be adjusted every adjustment period comprises the following steps:

in the adjusting period, whether the cell to be adjusted in the power adjusting cell list simultaneously meets the condition that the PRB utilization rate is lower than the preset PRB utilization rate and the RRC connection user number is not higher than the preset RRC connection user number is judged;

As shown in fig. 3, the adjustment period is determined after the energy saving adjustment date and time interval is entered. And in a certain adjustment period, respectively judging whether the PRB utilization rate and the number of RRC connection users meet the conditions, if one of the PRB utilization rate and the number of RRC connection users does not meet the conditions, giving up adjustment in the cell in the adjustment period, and if the two meet the conditions, entering adjustment amplitude judgment. And (3) judging the adjustment range: the adjusted 5M bandwidth multiple K is (total PRB number in the current cell (sector) -total PRB usage number in the last statistical period/target PRB utilization rate)/25, and is taken as an integer downward. Assuming that the total number of PRBs in a 20M cell is 100, the PRBs occupy 10 average in the previous period, and the target PRB utilization rate is 30%, where the calculation result K is 2, that is, the cell needs to be adjusted from 20M bandwidth to 10M bandwidth, and the preset amplitude is set to 10M, where the adjusted PRB utilization rate is increased from 10% to about 20%. In order to avoid the complaint risk caused by the network speed reduction due to the too low bandwidth shrinkage, it can be suggested that the TDD LTE bandwidth is shrunk by up to 10M. The preset amplitude can also be set to 5M according to practical situations. If statistics shows that the service of the last adjustment period is increased, the PRB utilization rate is greatly increased, the carrier bandwidth of the cell is improved by the adjustment, but the improvement amplitude cannot exceed the original bandwidth of the cell.

The power adjustment of the cell to be adjusted in the power adjustment cell list through the open wireless network optimization parameter comprises the following steps:

judging the sector type of a cell to be adjusted in the power adjustment cell list;

The cell shutdown is: and setting the CRS reference signal of the cell to be 0.1dBm, and adjusting the carrier bandwidth to be 5M.

As shown in fig. 4, if a certain cell to be adjusted is a single-layer frequency-point cell, the cell is a sector at this time, the cell bandwidth is reduced to 10M bandwidth, if the bandwidth is adjusted downward by 5M each time, the cell bandwidth can be adjusted only 3 times at most, and finally reduced to 10M, then the CRS port number of the cell is determined, if the CRS port number is 1, the adjustment is finished, if the CRS port number is 2, the CRS reference signal power is adjusted downward by 3dB, and the CRS port number is adjusted to 1, and the adjustment is finished.

If a certain cell to be adjusted belongs to a multilayer frequency point sector, when the longitude and latitude distances of two cells are within 50 meters and the difference of direction angles is within 30 degrees, the cell is generally judged to belong to a sector, the cells in the sector are numbered, the cells are sorted according to the frequency from small to large, the adjustment frequency is preferentially high, the cell with the lowest frequency in the sector is a covering layer cell, the other cells are thickness layer cells, the thickness layer cells are sequentially adjusted from large to low according to the frequency, the thickness layer cell with the highest frequency is preferentially adjusted and is adjusted for multiple times, if the carrier bandwidth reduced once exceeds 20M, the thickness layer cell needs to be closed, wherein the reference signal power is set to be 0.1dBm when the cell is closed, and the carrier bandwidth is reduced to be 5M. And after closing the cells with the partial thickness layers, judging the number of CRS ports of the covering layer cell, if the number of the CRS ports is 1, finishing the adjustment, if the number of the CRS ports is 2, reducing the power of the CRS reference signal of the covering layer cell by 3dB, adjusting the number of the CRS ports to 1, and finishing the adjustment.

It should be noted that, the technical solution of the present invention is described in terms of hua as a device, and some names such as network quality parameters may have different meanings from different manufacturers, such as "reference signal power", hua as RE power of reference signal, zhongxing as per-port power of reference signal, but the two may be converted. However, the technical solution of the present invention is not limited to a specific name, but should include actual concepts represented by the name.

Example one

As shown in fig. 5, after determining that a certain cell is in an adjustable state, an adjustment procedure is performed:

(1) and judging that a certain cell is a single-layer or multi-layer frequency point LTE cell.

(2) The average number of PRB occupancies PRB _ USED _ NUM per statistical period (15 minutes) for all cells within the same coverage is summarized in 0 to 6: 30.

(3) Dividing the average PRB occupancy number PRB _ USED _ NUM by the target PRB utilization ratio PRB _ TAR, obtains the required PRB number PRB _ NEED _ NUM0, that is, PRB _ NEED _ NUM0 ═ PRB _ USED _ NUM/PRB _ TAR. Dividing the required PRB number PRB _ NEED _ NUM0 by 25 and taking an integer upward to obtain the sector direction required 5M carrier bandwidth multiple CELL _5M _ NEED, that is, CELL _5M _ NEED ═ round (PRB _ NEED _ NUM/25, 0).

3.1) when the sector direction demand 5M carrier bandwidth multiple 25 is larger than the total PRB number-25 of the total cell in the sector, the sector is considered to have no energy-saving regulation condition, and the regulation is abandoned.

3.2) when the sector direction demand 5M carrier bandwidth multiple 25 is less than the total PRB-25 of the total cell in the sector, the sector is considered to have the adjustment condition.

3.2.1) when the sector direction demand 5M carrier bandwidth multiple 25 is less than the total PRB number of the total cells in the sector exceeds 100, the sector is considered to have a partial carrier off condition. And closing part of carriers. Instead of turning off, the bandwidth is reduced to 5M, the power is set to 0.1dBm, and the actual power is about 1.3 watts.

3.2.2) when the sector direction demand 5M carrier bandwidth multiple 25 is less than the total PRB of the total cells in the sector does not exceed 100, the sector is considered to have a condition to reduce bandwidth saving power. Reducing carrier bandwidth performance.

The implementation principle of the above adjustment scheme is as follows:

and the coverage thickness of the LTE cell is adjusted through open wireless parameters, so that the power of the equipment is adjusted and energy is saved. The actual power calculation of the RRU radio frequency equipment of the LTE base station requires 6 wireless parameter association calculations, which are CRS reference signal power, PA, PB, number of transmitting antennas, CRS port number, and carrier bandwidth RB, respectively. The association is as follows:

a) under the condition that other parameters are not changed, the number of CRS ports is adjusted from 2 to 1, the power of CRS reference signals is synchronously adjusted down by 3dB, the total power occupied by the cell RRU is reduced to half of the original power, but the power of each logic antenna port is not changed, the signal intensity of a user mobile phone is not changed, and the download rate is reduced by about half.

b) Under the condition that other parameters are not changed, the carrier bandwidth is reduced by half, the power occupied by the RRU in the cell is reduced to half of the original power, and at the moment, the signal intensity of the mobile phone of the user is not changed, but the downloading rate is reduced by about 60%.

c) In a multi-layer same-coverage scene, in idle time, a coverage layer is reserved, and cells with one or more thickness layers are closed, so that the coverage thickness is reduced, and the purpose of reducing power consumption is achieved.

Adjusting basis: according to the PRB utilization rate and the number of RRC connection users in the last statistical period and the set target PRB utilization rate and the number of RRC connection users, the coverage thickness of the cell is continuously reduced, namely the available PRB number is continuously reduced, and when the actual PRB utilization rate and the number of RRC connection users reach the target value, the adjustment is stopped.

Setting an adjustment limit: the minimum amplitude is 5M bandwidth, namely 25 RBs, and the amplitude is adjusted to be less than 25 RBs, so that the adjustment is abandoned. The adjusted limit of the single-layer frequency point sector is 10M bandwidth, the power of a reference signal is reduced by 3dB, the number of CRS ports is 1, and only 1/4 before adjustment exists even if the full-load maximum power of a cell is achieved. After the sector covered by the multi-layer frequency points together is adjusted, the bandwidth of the covering layer needs to be ensured to be unchanged, but the power of the reference signal is reduced by 3dB, meanwhile, the number of CRS ports is 1, and the thickness layer cell can be partially or completely closed as required.

Setting an adjustment period: one conditioning cycle every 15 minutes during the conditioning period.

The adjustment effect is estimated as follows:

watch 1

From the above table, by adjusting the bandwidth and closing the thickness layer, the transmission power of the base station is reduced as much as possible under the condition that the user coverage perception is not changed in the idle service, so that the overall energy efficiency level of the base station is improved, the overall energy-saving goal of a communication operator is achieved, the operation cost is reduced, and sustainable development is achieved.

The LTE network is "made thinner" when idle by means of radio network optimization parameters, which in the radio sense is to narrow the electromagnetic spectrum used by the network. From the perspective of user experience, coverage in idle time is unchanged, user perception is unchanged, and the method is generally applicable to all LTE equipment manufacturers.

The embodiment of the present invention further provides a system for dynamically adjusting power of an LTE base station, including:

an adjusting module, configured to determine, every adjustment period, whether a cell to be adjusted in the power adjustment cell list is adjustable on a set adjustable date and adjustable time, if so, perform power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, the wireless network optimization parameter includes: CRS reference signal power, PA, PB, number of transmit antennas, number of CRS ports, and carrier bandwidth.

The adjusting module is used for judging whether the cells to be adjusted in the power adjusting cell list can be adjusted every adjusting period and comprises the following steps:

in the adjusting period, judging whether the cells to be adjusted in the power adjusting cell list simultaneously meet the conditions that the PRB utilization rate is lower than the preset PRB utilization rate and the RRC connection user number is not higher than the preset RRC connection user number;

The adjusting module is used for adjusting the power of the cell to be adjusted in the power adjusting cell list through the open wireless network optimization parameter, and comprises:

if the cell to be adjusted is a single-layer frequency point cell, reducing the cell to be adjusted to a first preset bandwidth, if the CRS port number of the cell to be adjusted is 1, finishing the adjustment, if the CRS port number of the cell to be adjusted is 2, reducing the CRS reference signal power, adjusting the CRS port number to be 1, and finishing the adjustment;

The method and the system for dynamically adjusting the power of the LTE base station have the following advantages that:

1. no matter how the adjustment is carried out, the signal intensity perceived by the user is not changed, and the number of signal grids displayed by the mobile phone is not subject to obvious fluctuation change, so that the method is generally suitable for all LTE equipment manufacturers.

2. The number of the existing LTE cells is unchanged, the LTE cells do not quit the service, no alarm is given, the daily fault assessment is not influenced, and the influence on the existing system is small.

3. The minimum bandwidth of the single-layer network can be configured, and the minimum available carrier number of the multi-layer network can be set.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A method for dynamically adjusting power of an LTE base station is characterized by comprising the following steps:

(1) judging whether each LTE cell in the LTE base station meets adjustable conditions, if so, adding the LTE cell as a cell to be adjusted into a power adjustment cell list, wherein the adjustable conditions are as follows: the PRB utilization rate of continuous preset number of adjustment periods in idle time of the LTE cell is lower than the preset PRB utilization rate, the number of RRC connection users is not higher than the preset number of RRC connection users, the carrier bandwidth is greater than 10M, and the number of CRS ports is greater than 1;

(2) judging whether the cells to be adjusted in the power adjustment cell list are adjustable or not at intervals of an adjustment period within a set adjustable date and adjustable time, if so, performing power adjustment on the cells to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, adjusting the wireless network optimization parameter, wherein the wireless network optimization parameter comprises: CRS reference signal power, PA, PB, number of transmitting antennas, CRS port number and carrier bandwidth;

in the step (2), performing power adjustment on the cell to be adjusted in the power adjustment cell list through the open wireless network optimization parameter includes:

if the cell to be adjusted belongs to a multi-layer frequency point sector, sequencing the cells in the sector according to the frequency, wherein the minimum frequency is a covering layer cell, the other cells are thickness layer cells, sequentially adjusting the thickness layer cells according to the frequency from large to small, if the carrier bandwidth reduced by one thickness layer cell at a time exceeds a second preset bandwidth, closing the thickness layer cell, if the CRS port number of the covering layer cell is 1, finishing the adjustment, if the CRS port number of the covering layer cell is 2, reducing the CRS reference signal power and adjusting the CRS port number to 1, and finishing the adjustment.

2. The method of claim 1, wherein in step (2), the determining whether the cell to be adjusted in the power adjustment cell list is adjustable every adjustment period includes:

3. The method of claim 2, wherein the step of turning off the cell comprises: and setting the CRS reference signal of the cell to be 0.1dBm, and adjusting the carrier bandwidth to be 5M.

4. A dynamic power adjustment system for an LTE base station, comprising:

an adding module, configured to determine whether each LTE cell in the LTE base station satisfies an adjustable condition, and if yes, add the LTE cell as a cell to be adjusted to a power adjustment cell list, where the adjustable condition is: the PRB utilization rate of continuous preset number of adjustment periods in idle time of the LTE cell is lower than the preset PRB utilization rate, the number of RRC connection users is not higher than the preset number of RRC connection users, the carrier bandwidth is greater than 10M, and the number of CRS ports is greater than 1;

an adjusting module, configured to determine, every adjustment period, whether a cell to be adjusted in the power adjustment cell list is adjustable on a set adjustable date and at an adjustable time, if so, perform power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, and if not, the wireless network optimization parameter includes: CRS reference signal power, PA, PB, the number of transmitting antennas, the number of CRS ports and carrier bandwidth;

the adjusting module is configured to perform power adjustment on the cell to be adjusted in the power adjustment cell list through an open wireless network optimization parameter, including:

5. The system of claim 4, wherein the adjusting module is configured to determine, every adjustment period, whether the cell to be adjusted in the power adjustment cell list is adjustable includes:

6. The system of claim 5, wherein the cell shutdown step comprises: and setting the CRS reference signal of the cell to be 0.1dBm, and adjusting the carrier bandwidth to be 5M.