WO2015013968A1

WO2015013968A1 - Adjustment method and relevant device for downlink transmission power

Info

Publication number: WO2015013968A1
Application number: PCT/CN2013/080669
Authority: WO
Inventors: 黎超
Original assignee: 华为技术有限公司
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2015-02-05
Also published as: CN105264975A

Abstract

An adjustment method and a relevant device for a downlink transmission power. The method comprises: determining a base station to be adjusted in various candidate base stations; acquiring a value or change value of a performance parameter calculated by various candidate base stations, wherein the value of the performance parameter of various candidate base stations is calculated according to a value of channel quality parameter reported by a user equipment (UE) respectively residing in various candidate base stations when a current downlink transmission power is used, and the change value of the performance parameter of various candidate base stations is calculated according to a value of channel quality parameter reported by a user equipment (UE) respectively residing in various candidate base stations when a current downlink transmission power is used and when a previous downlink transmission power is used; and according to the value or change value of the performance parameter calculated by the acquired various candidate base stations, updating a downlink transmission power of the base station to be adjusted. The solution realizes the dynamical adjustment of the downlink transmission power of a base station to be adjusted.

Description

Method for adjusting downlink transmission power and related device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a device for adjusting downlink transmit power. Background technique

The wireless communication system with the main research purpose of improving spectral efficiency has experienced the development from the second generation ( ^2nd Generation, 2G) to 4G. In particular, after undergoing the development of Orthogonal Frequency Division Multiplexing (OFDM)-based modulation and multi-antenna-based Multiple Input Multiple Output (MIMO) technology, It is very difficult to increase the transmission efficiency on the unit spectrum. With the development of wireless communication and the popularity of smart phones, users are increasingly demanding large-capacity transmissions. The huge difference between transmission efficiency and transmission demand has caused reflections in academia and industry. In recent years, it is an effective implementation method to increase the transmission efficiency of hotspots by increasing the deployment of small cells. The small cell deployment can increase the deployment of multiple small cell sites in the hotspot area with a smaller coverage radius, thereby increasing the throughput of the entire system.

At present, the mainstream systems have also strengthened research on small communities. The Long Term Evolution (LTE) and its evolutionary version, which are based on the 3rd Generation Partnership Project (3GPP), are the most important systems in 4G mobile communications. There are a variety of application scenarios in the LTE system, including: small-cell outdoor deployment scenarios with macro coverage, small-cell indoor deployment scenarios with macro coverage, and small-cell indoor deployment scenarios without macro coverage.

The deployment of small cells is equivalent to deploying more transmission points per unit area. The total throughput of the system will be greatly improved compared to the system without small cell deployment. However, the downlink transmit power of the small cell is usually configured in the background by the operation and maintenance system. Once configured, it usually does not change. Therefore, if the downlink transmit power of the small cell is too large, it will cause co-channel interference. Do not The necessary transmission power is wasted; if the downlink transmission power of the small cell is too small, some user service restrictions may occur. In addition, if the location of the user equipment changes in the system, or the throughput of each small cell changes significantly, the downlink transmit power of the small cell cannot adapt to these changes, and a reasonable adjustment needs to be made. However, there is currently no method for dynamically adjusting the transmit power of a small cell. Summary of the invention

The embodiment of the invention provides a method for adjusting downlink transmit power and related devices, which are used to dynamically adjust downlink transmit power of a small cell.

In a first aspect, a method for adjusting downlink transmit power is provided, including:

Determining a base station to be adjusted in each candidate base station;

Acquiring a value or a change value of the performance parameter calculated by each candidate base station, where the value of the performance parameter of each candidate base station is based on when the current downlink transmit power reported by the user equipment UE camped by each candidate base station is used. Calculating the value of the channel quality parameter, the change value of the performance parameter of each candidate base station is based on the channel when the current downlink transmit power reported by the UE camped by each of the candidate base stations is used and the previous downlink transmit power is used. The value of the quality parameter is calculated;

And updating the downlink transmit power of the base station to be adjusted according to the obtained value or the change value of the performance parameter calculated by each candidate base station.

With reference to the first aspect, in a first possible implementation, determining a base station to be adjusted in each candidate base station includes:

And a base station that receives the downlink transmit power adjustment command in each candidate base station is used as the to-be-tuned base station; or

A candidate base station that matches the current downlink transmit power and the value of the base station decision parameter to be adjusted in the candidate base stations according to the setting criterion is used as the base station to be adjusted.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following:

The current downlink transmit power is the largest and the minimum value of CQI is the largest; The current downlink transmit power is the smallest and the minimum value of CQI is the smallest;

The current downlink transmit power is the largest and the maximum value of CQI is the largest;

If the determining parameter of the to-be-adjusted base station is a load, the setting criterion specifically includes one of the following: the current downlink transmitting power is the largest and the load is the minimum;

The current downlink transmit power is the smallest and the load is the largest;

The current downlink transmit power is the same and the load is minimum;

If the base station decision parameter to be adjusted is the number of UEs that camp on, the setting criterion specifically includes one of the following:

The current downlink transmit power is the largest and the number of UEs camping is the least;

The current downlink transmit power is the smallest and the number of UEs that camp on is the largest;

The current downlink transmit power is the same and the number of UEs camping is the least.

With reference to the first aspect, in a third possible implementation, the downlink transmit power of the to-be-adjusted base station is updated according to the obtained value or change value of the performance parameter that is calculated by each candidate base station, and specifically includes:

Determining, according to the obtained value or the change value of the performance parameter calculated by each candidate base station, whether the current downlink transmit power of the to-be-adjusted base station can ensure the performance of the communication system where the base station to be adjusted is located;

If it can be ensured, the current downlink transmit power of the base station to be adjusted is updated according to the set difference value. With reference to the first aspect, in a fourth possible implementation, the downlink transmit power of the to-be-adjusted base station is updated according to the obtained value or the change value of the performance parameter that is calculated by the candidate base stations, which specifically includes:

If it is not ensured, the current downlink transmit power of the base station to be adjusted is updated to the previous downlink transmit power.

Combining the third possible implementation of the first aspect or the fourth possible implementation of the first aspect In a fifth possible implementation manner, determining whether the current downlink transmit power of the to-be-adjusted base station can ensure the to-be-determined according to the obtained value or the change value of the performance parameter calculated by each candidate base station Adjust the performance of the communication system where the base station is located, including:

If the performance parameter is CQI, the value of the CQI corresponding to the edge UE is selected from the obtained CQI value, and the value of the selected CQI is compared with the quality of service threshold. If the quality of service threshold is exceeded, the Adjusting the current downlink transmit power of the base station can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system; and the value of the reported CQI of the edge UE is less than or equal to a UE that sets a threshold;

And if the performance parameter is a throughput, calculating a sum value of the obtained change value of the throughput, and determining whether the sum value is greater than or equal to zero, and if the value is greater than or equal to zero, the current downlink transmit power of the to-be-adjusted base station can ensure the Performance of the communication system; otherwise, the current downlink transmission power of the base station to be adjusted cannot ensure the performance of the communication system;

If the performance parameter is a load, determining whether the obtained value of the load of the to-be-adjusted base station is less than a load threshold, and if the value is smaller than the load threshold, the current downlink transmit power of the to-be-adjusted base station can ensure the communication system. performance.

With reference to the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, the fourth possible aspect of the first aspect In an implementation manner, or a fifth possible implementation manner of the first aspect, in a sixth possible implementation, the downlink transmit power of the to-be-adjusted base station is updated, and specifically includes: transmit power.

With reference to the sixth possible implementation of the first aspect, in a seventh possible implementation, the power includes:

Updating downlink transmit power of selected symbols in the selected subframe or the selected subframe for the selected UE camping on the base station to be adjusted.

Combining the first aspect, the first possible implementation of the first aspect, the second aspect of the first aspect Possible implementation, a third possible implementation of the first aspect, a fourth possible implementation of the first aspect, a fifth possible implementation of the first aspect, a sixth possibility of the first aspect And the seventh possible implementation manner of the first aspect, in the eighth possible implementation manner, after updating the downlink transmit power of the to-be-adjusted base station, the method further includes: reporting, The other candidate base stations outside the base station to be adjusted.

With reference to the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, the fourth possible aspect of the first aspect The implementation manner, the fifth possible implementation manner of the first aspect, the sixth possible implementation manner of the first aspect, the seventh possible implementation manner of the first aspect, or the eighth possible implementation of the first aspect In a ninth possible implementation manner, the channel quality parameter includes one or a combination of a channel quality indicator CQI, a reference signal received power RSRP, a reference signal received quality RSRQ, and a received signal strength indicator RSSI.

In a second aspect, an apparatus for adjusting downlink transmit power is provided, including:

a determining unit, configured to determine, in each candidate base station, a base station to be adjusted;

An acquiring unit, configured to obtain a value or a change value of the performance parameter calculated by each candidate base station, where the value of the performance parameter of each candidate base station is used according to the current usage reported by the user equipment UE that each of the candidate base stations resides Calculating the value of the channel quality parameter in the downlink transmit power, the change value of the performance parameter of each candidate base station is based on the current downlink transmit power reported by the UE camped by each candidate base station, and the previous downlink is used. Calculated by the value of the channel quality parameter at the time of transmission power;

And an update unit, configured to update downlink transmit power of the to-be-adjusted base station according to the obtained value or change value of the performance parameter calculated by each candidate base station.

With reference to the second aspect, in a first possible implementation manner, the determining unit is specifically configured to: use, as the to-be-tuned base station, a base station that receives a downlink transmit power adjustment command in each candidate base station; or

Determining the current downlink transmit power and the value of the base station decision parameter to be adjusted in each candidate base station The candidate base station that sets the criterion is used as the base station to be adjusted.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following:

The current downlink transmit power is the largest and the minimum value of CQI is the largest;

The current downlink transmit power is the smallest and the minimum value of CQI is the smallest;

The current downlink transmit power is the same and the load is minimum;

With reference to the second aspect, in a third possible implementation, the updating unit is specifically configured to: determine, according to the obtained value or change value of the performance parameter calculated by each candidate base station, the base station to be adjusted Whether the current downlink transmit power can ensure the performance of the communication system in which the base station to be adjusted is located;

If it can be ensured, the current downlink transmit power of the base station to be adjusted is updated according to the set difference value. With reference to the second aspect, in a fourth possible implementation, the updating unit is specifically configured to: determine, according to the obtained value or change value of the performance parameter calculated by each candidate base station, the base station to be adjusted Whether the current downlink transmit power can ensure the performance of the communication system in which the base station to be adjusted is located;

Combining the third possible implementation of the second aspect or the fourth possible implementation of the second aspect In a fifth possible implementation manner, the updating unit is specifically configured to: if the performance parameter is CQI, select a CQI value corresponding to the edge UE from the obtained CQI value, and select The value of the CQI is compared with the QoS threshold. If the QoS threshold is exceeded, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted The performance of the communication system cannot be ensured; the edge UE is a UE whose reported CQI value is less than or equal to a set threshold;

With reference to the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, the third possible implementation of the second aspect, and the fourth possible aspect of the second aspect In an implementation manner, or a fifth possible implementation manner of the second aspect, in the sixth possible implementation, the updating unit is specifically configured to: transmit power.

With reference to the sixth possible implementation of the second aspect, in a seventh possible implementation, the updating unit is specifically configured to:

With reference to the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, the third possible implementation of the second aspect, and the fourth possible aspect of the second aspect The implementation manner, the fifth possible implementation manner of the second aspect, the sixth possible implementation manner of the second aspect, or the seventh possible implementation manner of the second aspect, in the eighth possible implementation In the current mode, the update unit is further configured to: after updating the downlink transmit power of the to-be-adjusted base station, the update amount of the rate is notified to other candidate base stations except the base station to be adjusted.

With reference to the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, the third possible implementation of the second aspect, and the fourth possible aspect of the second aspect The implementation manner, the fifth possible implementation manner of the second aspect, the sixth possible implementation manner of the second aspect, the seventh possible implementation manner of the second aspect, or the eighth possible implementation of the second aspect In a ninth possible implementation manner, the channel quality parameter includes one or a combination of a channel quality indicator CQI, a reference signal received power RSRP, a reference signal received quality RSRQ, and a received signal strength indicator RSSI.

With reference to the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, the third possible implementation of the second aspect, and the fourth possible aspect of the second aspect The implementation manner, the fifth possible implementation manner of the second aspect, the sixth possible implementation manner of the second aspect, the seventh possible implementation manner of the second aspect, and the eighth possible implementation of the second aspect The ninth possible implementation manner of the second aspect, in the tenth possible implementation manner, the apparatus for adjusting the downlink transmit power is a macro base station, a micro base station, or a control device.

In a third aspect, a communication device is provided, including:

a transceiver, configured to obtain a value or a change value of a performance parameter calculated by each candidate base station, where a value of the performance parameter of each candidate base station is used according to a current downlink transmission reported by a user equipment UE that is resident in each candidate base station Calculating the value of the channel quality parameter at the time of the power, the change value of the performance parameter of each candidate base station is based on the current downlink transmit power reported by the UE camped by each of the candidate base stations, and the previous downlink transmit power is used. The value of the channel quality parameter is calculated;

And a processor, configured to determine, in the candidate base stations, a base station to be adjusted; and update, according to the obtained value or a change value of the performance parameter calculated by each candidate base station, a downlink transmit power of the to-be-adjusted base station.

With reference to the third aspect, in a first possible implementation, the processor is specifically configured to: And a base station that receives the downlink transmit power adjustment command in each candidate base station is used as the base station to be adjusted; or

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following:

The current downlink transmit power is the same and the load is minimum;

With reference to the third aspect, in a third possible implementation, the processor is specifically configured to: determine, according to the obtained value or change value of the performance parameter calculated by each candidate base station, the base station to be adjusted Whether the current downlink transmit power can ensure the performance of the communication system in which the base station to be adjusted is located;

If it can be ensured, the current downlink transmit power of the base station to be adjusted is updated according to the set difference value. With reference to the third aspect, in a fourth possible implementation, the processor is specifically configured to: determine, according to the obtained value or change value of the performance parameter calculated by each candidate base station, the base station to be adjusted Whether the current downlink transmit power can ensure the performance of the communication system in which the base station to be adjusted is located; If not, the current downlink transmit power of the to-be-adjusted base station is updated to the previous downlink transmit power.

In conjunction with the third possible implementation of the third aspect, or the fourth possible implementation of the third aspect, in a fifth possible implementation, the processor is specifically configured to:

With reference to the third aspect, the first possible implementation of the third aspect, the second possible implementation of the third aspect, the third possible implementation of the third aspect, and the fourth possible aspect of the third aspect In an implementation manner, or a fifth possible implementation manner of the third aspect, in a sixth possible implementation, the processor is specifically configured to: transmit power.

With reference to the sixth possible implementation of the third aspect, in a seventh possible implementation, the processor is specifically configured to:

Combining the third aspect, the first possible implementation manner of the third aspect, the second aspect of the third aspect Possible implementation, a third possible implementation of the third aspect, a fourth possible implementation of the third aspect, a fifth possible implementation of the third aspect, and a sixth possibility of the third aspect The implementation manner of the third aspect, or the seventh possible implementation manner of the third aspect, in the eighth possible implementation manner, the processor is further configured to update an update rate of the downlink transmit power of the to-be-adjusted base station The quantity is notified to other candidate base stations except the base station to be adjusted.

With reference to the third aspect, the first possible implementation of the third aspect, the second possible implementation of the third aspect, the third possible implementation of the third aspect, and the fourth possible aspect of the third aspect The implementation manner, the fifth possible implementation manner of the third aspect, the sixth possible implementation manner of the third aspect, the seventh possible implementation manner of the third aspect, or the eighth possible implementation manner of the third aspect In a ninth possible implementation manner, the channel quality parameter includes one or a combination of a channel quality indicator CQI, a reference signal received power RSRP, a reference signal received quality RSRQ, and a received signal strength indicator RSSI.

With reference to the third aspect, the first possible implementation of the third aspect, the second possible implementation of the third aspect, the third possible implementation of the third aspect, and the fourth possible aspect of the third aspect The implementation manner, the fifth possible implementation manner of the third aspect, the sixth possible implementation manner of the third aspect, the seventh possible implementation manner of the third aspect, and the eighth possible implementation of the third aspect The ninth possible implementation manner of the third aspect, in the tenth possible implementation manner, the communications device is a macro base station, a micro base station, or a control device.

According to the method for adjusting the downlink transmit power provided by the first aspect, the device for adjusting the downlink transmit power provided by the second aspect, or the communication device provided by the third aspect, after determining the base station to be adjusted in each candidate base station, each candidate base station receives each Calculating the value of the performance parameter after the value of the channel quality parameter when the current downlink transmit power is reported by the resident UE, or receiving the channel quality when the currently camped UE uses the current downlink transmit power and the previous downlink transmit power is used. After the value is calculated, the change value of the performance parameter is calculated, and then the downlink transmit power of the base station to be adjusted is updated according to the value or the change value of the performance parameter calculated by each candidate base station, and the downlink transmit power of the base station to be adjusted is dynamically adjusted, and the base station to be adjusted is adjusted. When the downlink transmit power is too large, the downlink transmit power can be lowered to avoid co-frequency interference. If the downlink transmit power of the base station to be adjusted is too small, the downlink transmit power can be adjusted to ensure the quality of service of the UE. In the case of the location change of the UE, the downlink transmit power of the base station to be adjusted can also be adjusted to ensure the service of the UE. Quality and performance of the communication system in which the base station is located. DRAWINGS

1 is a flowchart of a method for adjusting downlink transmit power according to an embodiment of the present invention;

2 is a comparison diagram of effects of adjusting a method for adjusting downlink transmit power in a first embodiment according to an embodiment of the present invention;

FIG. 3 is a comparison diagram of effects of adjusting a method for adjusting downlink transmit power in a second embodiment according to an embodiment of the present invention; FIG.

4 is a flowchart of updating downlink transmit power of a base station to be adjusted in an embodiment of the present invention;

6 is a schematic diagram of transmitting, by each candidate base station, CSI-RS signals of different powers according to Embodiment 1 of the present invention;

7 is a flowchart of a method for adjusting downlink transmit power according to Embodiment 1 of the present invention;

FIG. 8 is a schematic structural diagram of an apparatus for adjusting downlink transmit power in an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a communication device according to an embodiment of the present invention. detailed description

In order to dynamically adjust the downlink transmit power of the small cell, the embodiment of the present invention provides a method for adjusting downlink transmit power, which can be applied to an LTE system, a Wideband Code Division Multiple Access (WCDMA) system, and a high speed. In a communication system such as a High Speed Packet Access (HSPA) system or a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, the following is an example of application in an LTE system. Be explained. The flow of the method for adjusting the downlink transmit power is shown in Figure 1. The execution process is as follows: S10: Determine, in each candidate base station, a base station to be adjusted.

The executor of the method may be a macro base station, a micro base station, or a control device, etc., and the candidate base station may be a macro base station, a micro base station, or the like. The base station to be adjusted is determined in the candidate, and the base station to be adjusted may be one or multiple.

S11: Obtain a value or a change value of the performance parameter calculated by each candidate base station.

The value of the performance parameter of each candidate base station is based on the user equipment resident in each candidate base station.

The user equipment (UE) calculates the value of the channel quality parameter when the current downlink transmit power is used. The change value of the performance parameter of each candidate base station is based on the current downlink transmit power reported by the UE camped by each candidate base station. Calculated by the value of the channel quality parameter when using the previous downlink transmit power. The candidate base stations can transmit information through the X2 interface, or can transmit information through other interfaces such as the airborne wireless transmission interface.

S12: Update downlink transmit power of the base station to be adjusted according to the obtained value or change value of the performance parameter calculated by each candidate base station.

The downlink transmit power of the base station to be adjusted is updated according to the obtained value or change value of the performance parameter calculated by each candidate base station. The downlink transmit power of the base station can be adjusted multiple times until the best downlink transmit power is obtained.

In the process of adjustment, the downlink transmit power of the selected signal may be adjusted first, and after obtaining the optimal downlink transmit power, the downlink transmit power of the entire base station to be adjusted may be updated, and the downlink transmit power of the base station to be adjusted may also be adjusted. After the adjustment is performed to obtain the optimal downlink transmit power, the downlink transmit power of the entire base station to be adjusted is updated to the optimal downlink transmit power.

The selected signal may be a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), or the like.

The following two examples are used to describe the effect that the downlink transmit power adjustment method in this embodiment can be used to adjust the downlink transmit power adjustment of the base station.

As shown in Figure 2, the macro base station Macro is responsible for the coverage of a large area transmission, and the micro base stations LPN1-LPN4 are responsible for the capacity increase of each hotspot area, and the frequencies used by LPN1~LPN4 are the same. The frequencies used by Macro and LPN1~LPN4 can be the same or different. It can be assumed that there is no a priori information when the LPN is powered on, so the LPN1 LPN4 is initially set to the same downlink transmit power, such as 30 dBm. In the same environment, the coverage of LPN1 LPN4 is approximately the same. As shown in the left diagram of Figure 2, the resident micro-base station of UE1 is LPN3, and the resident micro-base station of UE2 is LPN2. At this time, UE1 is subject to LPN2 and LPN1. Strong co-channel interference, and there is no UE camping under LPN4, but it still uses the same downlink transmit power transmission signal as other micro base stations, and the signal transmitted by LPN4 causes unnecessary power waste and interference. After the method for adjusting the downlink transmit power in this embodiment, the micro base station that does not camp on the UE can be turned off. As shown in the right side of FIG. 2, turning off the LPN4 can save power and reduce unnecessary. Interference, it is also possible to reduce the downlink transmit power of the micro base station with fewer UEs and the number of edge UEs, so that the same-frequency interference to the adjacent micro base stations can be reduced, as shown in the right figure of FIG. It shows that after the power reduction, the coverage radius of LPN2 and LPN3 is significantly reduced. As seen from FIG. 2, the overlap of the coverage of the micro base station is greatly reduced, and the number of camped UEs does not change, so that the co-channel interference between different micro base stations is greatly reduced.

According to the actual situation of each LPN, not only the downlink transmit power of the LPN can be lowered, but also the coverage range can be reduced. The downlink transmit power and the downward transmit power can be down-regulated for different LPN stations. The number of UEs camping on the LPN2 in the left-hand diagram of Figure 3 is increased. At this time, the quality of service of some UEs is not guaranteed, that is, the signal quality of UE1 and UE2 is degraded. After the downlink transmit power adjustment method in this embodiment is used to increase the downlink transmit power of the LPN2, the UE3 switches, and the LPN3 switches to the LPN2, and the LPN3 lowers the downlink transmit power, and since the LPN2 raises the downlink transmit power, The coverage is also increased. UE1 and UE2, which were originally at the edge of the cell, get better service, and the downlink transmit power of LPN1 does not change throughout the process.

It can be seen that the method for adjusting the downlink transmit power in this embodiment dynamically adjusts the downlink transmit power of the base station to be adjusted. When the downlink transmit power of the base station to be adjusted is too large, the downlink transmit power can be adjusted downward to avoid co-channel interference. If the downlink transmit power of the base station is too small, the downlink transmit power can be adjusted to ensure the quality of service of the UE. In the case of the location change of the UE, the downlink transmit power of the base station to be adjusted can be adjusted to ensure the quality of service of the UE and the base station. The performance of the communication system. Specifically, the channel quality parameter includes a channel quality indicator (CQI), a reference signal received power (RSRP), a reference signal received quality (RSRQ), and a received signal strength indicator ( One or a combination of Received Signal Strength Indication, RSSI.

Specifically, the base station to be adjusted is determined in each candidate base station in the foregoing S11, and may be used in the following two manners:

The first type is a passive selection or triggering manner, and the base station that receives the downlink transmission power adjustment command in each candidate base station is used as the base station to be adjusted.

In this manner, the control device or the macro base station determines whether the base station of the candidate base station needs to perform downlink transmission power adjustment, determines the determined base station as the base station to be adjusted, and also determines that the base station to be adjusted needs to uplink the downlink transmission power. Still need to downgrade the downlink transmit power.

The principle determined by the control device or the macro base station may be based on the number of camped UEs of each candidate base station, the load condition, the quality of service of the edge UE, and the like.

The second method is to actively adjust or trigger, and the candidate base station that matches the current downlink transmit power and the value of the base station decision parameter to be adjusted in each candidate base station according to the set criterion is used as the base station to be adjusted.

In this way, each candidate base station determines whether it needs to adjust the downlink transmit power. It is determined whether the current downlink transmit power and the received channel quality parameter meet the set criteria, and can also determine Is it necessary to up-regulate the downlink transmit power or to down-convert the downlink transmit power.

The base station decision parameters to be adjusted may include multiple types, such as: CQI, load, number of camped UEs, and the like. When the base station decision parameters to be adjusted are different, the setting criteria are also different. The setting criteria corresponding to the decision parameters.

The first type, if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following: the current downlink transmit power is the largest and the CQI minimum value is the largest;

The current downlink transmit power is the largest and the maximum CQI is the largest.

At the same time, the downlink power adjustment mode of the base station to be adjusted may also be determined according to the setting criterion. When the downlink transmit power is the largest and the minimum value of the CQI is the largest, and the downlink transmit power is the largest and the maximum value of the CQI is the maximum, the downlink transmit power of the base station to be adjusted needs to be adjusted downward; when the downlink transmit power is the smallest and the minimum value of the CQI is the minimum, The downlink transmit power of the base station to be adjusted needs to be adjusted.

The downlink transmit power of each candidate base station and the minimum or maximum value of the CQI may be compared to determine whether the set criteria are met. The minimum value of the CQI refers to the minimum value of the CQI reported by the UE camped in the base station, which may be reported by one UE or reported by multiple UEs. The maximum value of the CQI refers to the UE reported by the UE stationed in the station. The value of the CQI is the largest, which can be reported by one UE or reported by multiple UEs.

Second, if the base station decision parameter to be adjusted is a load, the setting criterion specifically includes one of the following: The current downlink transmit power is the largest and the load is the minimum;

The current downlink transmit power is the same and the load is minimal.

At the same time, the downlink power adjustment mode of the base station to be adjusted may be determined according to the setting criterion. When the downlink transmission power is the largest and the load is the smallest, and the downlink transmission power is the same and the load is the minimum, the downlink transmission power of the base station to be adjusted needs to be adjusted. When the downlink transmit power is the smallest and the load is the largest, the downlink transmit power of the base station to be adjusted needs to be adjusted.

The downlink transmit power of each candidate base station can be compared with the load to determine whether the set criteria are met.

Third, if the base station decision parameter to be adjusted is the number of UEs that camp on, the setting criteria specifically include one of the following:

At the same time, the downlink power adjustment mode of the base station to be adjusted may be determined according to the setting criterion. When the downlink transmission power is the largest, the minimum value of the CQI is the largest, and the downlink transmission power is the largest and the maximum value of the CQI is the maximum, the situation needs to be lowered. Adjusting the downlink transmit power of the base station; when the downlink transmit power is the smallest and the minimum value of the CQI is the smallest, the downlink transmit power of the base station to be adjusted needs to be adjusted. The downlink transmit power of each candidate base station and the number of camped UEs may be compared to determine whether the set criteria are met.

Whether it is passive selection or triggering, or active selection or triggering, once the base station to be adjusted is determined, the assistance of other candidate base stations is needed to adjust the downlink transmission power of the base station to be adjusted.

Specifically, in the foregoing S12, the downlink transmit power of the base station to be adjusted is updated according to the value or the change value of the performance parameter calculated by each candidate base station, as shown in FIG. 4, the execution steps are as follows:

S40: Obtain a value or a change value of a performance parameter calculated by each candidate base station.

S41: Determine whether the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system where the base station is to be adjusted. If it can be ensured, execute S42; if not, perform S43.

S42: Update the current downlink transmit power of the base station to be adjusted according to the set difference.

The difference is set to reflect whether the downlink transmit power of the base station to be adjusted needs to be adjusted upwards or downwards. When the uplink is adjusted upwards, the set difference is positive; when the downward adjustment is made, the set difference is negative.

S43: Update the current downlink transmit power of the base station to be adjusted to the previous downlink transmit power. If the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system where the base station is to be adjusted, it indicates that the current downlink transmit power of the base station to be adjusted is not optimal, and the previous downlink transmit power is optimal, and may be adjusted. The current downlink transmit power of the base station is updated to the previous downlink transmit power.

Specifically, the value or the change value of the performance parameter calculated according to the acquired candidate base stations in the foregoing S40, and whether the current downlink transmit power of the base station to be adjusted in the foregoing S41 can ensure the performance of the communication system where the base station is to be adjusted, When the performance parameters are different, the process of judgment is different. The following three process parameters are judged:

The first type, if the performance parameter is CQI, the value of the CQI corresponding to the edge UE is selected from the obtained CQI values, and the value of the selected CQI is compared with the quality of service threshold. If the quality of service threshold is exceeded, the base station to be adjusted is to be adjusted. The current downlink transmit power can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system.

The concept of an edge UE is introduced. The edge UE refers to a UE that resides in a base station and reports a value of CQI that is less than or equal to a specific threshold. The specific threshold can be CQI index 4, of course Other values are not described here.

As shown in the following table, in the LTE system, CQI index 4 corresponds to Quaternary Phase Shift Keying (QPSK) modulation, and the transmission efficiency is 0.6016, corresponding to Additive White Gaussian Noise (AWGN). The lower operating threshold is approximately -ldB. If the number of UEs camped on the base station to be adjusted is small and relatively close to the base station to be adjusted, the base station to be adjusted may not have edge UEs.

The UE corresponding to the minimum value of the CQI refers to the UE corresponding to the minimum value selected from the values of the CQI reported by the base station. The UE corresponding to the minimum value of CQI may be one or more. At the same time, the UE corresponding to the minimum value of CQI may be an edge UE or an edge UE.

The quantization table for CQI in the existing protocol (LTE version -11 and earlier) is as follows:

CQI Index modulation rate x l024 efficiency

0 over range

1 QPSK 78 0.1523

2 QPSK 120 0.2344

3 QPSK 193 0.3770

4 QPSK 308 0.6016

5 QPSK 449 0.8770

6 QPSK 602 1.1758

7 16QAM 378 1.4766

8 16QAM 490 1.9141

9 16QAM 616 2.4063

10 64QAM 466 2.7305

11 64QAM 567 3.3223

12 64QAM 666 3.9023

13 64QAM 772 4.5234

14 64QAM 873 5.1152

15 64QAM 948 5.5547 Secondly, if the performance parameter is throughput, calculate the sum of the changed values of the obtained throughput, and determine whether the sum value is greater than or equal to zero. If the value is greater than or equal to zero, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system. Otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system.

The sum of the throughput of each candidate base station when the current downlink transmit power is used is compared with the change value of the throughput when the previous downlink transmit power is used, and whether the obtained sum value is greater than or equal to zero, and further determining whether the base station to be adjusted can ensure communication System performance.

The third type, if the performance parameter is the load, determines whether the value of the obtained load of the base station to be adjusted is less than the load threshold, and if it is less than the load threshold, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system; otherwise, the data to be adjusted The current downlink transmit power of the base station is not capable of ensuring the performance of the communication system.

It is also possible to determine whether the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system according to the value of the load when the base station uses the current downlink transmit power to be adjusted.

The method for adjusting the downlink transmit power of the base station to be adjusted in the foregoing S12 includes: the method for adjusting the downlink transmit power in the embodiment may be a sub-frame level, or may be a symbol level in a sub-frame. The selected symbols of the stator frame and the selected subframe can be determined as needed.

FIG. 5 is a schematic diagram of a downlink transmit power adjustment method at a subframe level or a symbol level, where subframes 1, 2, 3, 4, 7, 8, and 9 are single frequency network multicast/broadcast (Multicast/Broadcast over Single) /Frequency Network, MBSFN) Subframe, subframes 0, 5, and 6 are Non-MBSFN subframes. In each 10ms radio frame, MBSFN subframes can be configured by signaling. The MBSFN subframe differs from the non-MBSFN subframe in that the MBSFN subframe has CRS symbols on the first 1-2 OFDM symbols, and the remaining OFDM symbols have no CRS symbols; and the Non-MB SFN subframes in all OFDMs. There are CRS symbols in the symbol. Therefore, the power of the Non-MBSFN subframe needs to be adjusted together with the selected signal or the downlink transmit power of the base station to be adjusted, and the downlink transmit power in the MBSFN subframe, the symbol carrying the CRS symbol can be related to the selected signal or the downlink of the base station to be adjusted. The transmit power is adjusted together, no Specifically, the updating the downlink transmit power of the selected subframe of the to-be-adjusted base station or the selected one of the selected subframes includes: updating the selected subframe or selecting the selected UE that is camped on the base station to be adjusted The downlink transmit power of the selected symbol in the stator frame.

The downlink transmit power adjustment may also be performed on selected symbols of the selected subframe or the selected subframe for the selected UE camping in the base station to be adjusted, and the selected UE may be all or part of the base station to be adjusted. The UE, thereby achieving flexible adjustment of downlink transmit power.

Specifically, after updating the downlink transmit power of the to-be-adjusted base station in the foregoing S12, the method further includes: updating the update amount of the rate to other candidate base stations except the base station to be adjusted.

After the base station is adjusted to update the downlink transmit power, the other candidate base stations may be notified, and the update amount may be notified, and the downlink transmit power adjustment may be prepared for re-adjustment. Embodiment 1:

As shown in Fig. 6, each of the candidate base stations, LPN1 and LPN2, can transmit CSI-RS signals with different downlink transmission powers, wherein the CSI-RS1 signals are transmitted with P-cl and the CSI-RS2 signals are transmitted with P-c2.

In this embodiment, LPN2 is a base station to be adjusted, and LPN2 is used as an execution body to perform downlink transmission power adjustment, which is first used to adjust the downlink transmit power of the CSI-RS, when determining the optimal downlink transmit power. Then, adjust the downlink transmit power of LPN2, as shown in Figure 7, the specific process is as follows:

S70: The process begins.

The number of adjustments of the downlink transmission power can be represented by i, and i=0 represents the initial state, and the value of i is increased by one every time the downlink transmission power is adjusted. The power increase and decrease indication can be indicated by ΔΡ_flag. It can be determined whether the downlink transmit power needs to be adjusted up or down when determining the base station to be adjusted, or the initial value can be set, and the power increase and decrease indication is changed in the process of adjustment. Wherein, when the downlink transmit power is increased, ΔΡ_flag=l, ΔΡ_flag=0 when the downlink transmission power is reduced, of course, it can also be set to other values. In this embodiment, the initial value of the setting is used as an example.

S71: The LPN2 configures the CSI-RS2 measurement resource and notifies the LPN1, and the LPN1 and the LPN2 respectively transmit the CSI-RS1 signal and the CSI-RS2 signal to the respective camped UEs.

The LPN2 configures the measurement resources of the CSI-RS2 for the UE camped in the base station, and notifies the neighboring LPN1 of the configuration information of the CSI-RS2 and the current downlink transmission power through the X2 interface. The configuration information of the CSI-RS2 includes: configuration information of a transmission period and configuration information of a CSI-RS signal, which can uniquely determine a period in which the CSI-RS2 appears, a subframe number, an antenna port number, and a time-frequency position.

After receiving the configuration information of the CSI-RS2 and the current downlink transmission power transmitted by the LPN2, the LPN1 sends the configuration information of the CSI-RS1 to the resident UE at the same or different location from the CSI-RS2. There are two ways. In the first way, the position and period of the CSI-RS1 signal sent by LPN1 are exactly the same as CSI-RS2, except that the sequence and downlink transmit power are different from CSI-RS2. The second way is CSI-RS1 signal. It is different from the time-frequency resource of the CSI-RS2 signal.

LPN2 and LPN1 respectively transmit the CSI-RS2 signal and the CSI-RS1 signal to the respective camped UEs using the current downlink transmit power at the location of the configured CSI-RS.

S72: Each UE camped in LPN2 and LPN1 performs CQI measurement on the measured resource of the received CSI-RS, and then feeds back the value of CQI.

If the UEs in the LPN2 and the LPN1 are in the idle state, the value of the CQI reported by the UE may be obtained, or the UE may be activated first, and then the value of the CQI fed back by the UE is received. The value of the CQI may be the value of the CQI of the wideband, or the value of the CQI of the subband, and at least the value of the CQI of the wideband, which can reduce the signaling overhead of the feedback and smooth out the frequency selectivity. The fluctuation of the signal strength at which CQI occurs is measured on the sub-band.

S73: The LPN2 determines whether the current downlink transmit power used on the CSI-RS2 can ensure the performance of the communication system. If yes, execute S84; otherwise, execute S88.

The LPN1 calculates the throughput according to the value of the CQI corresponding to the current downlink transmission power fed back by the UE, and then calculates the throughput of the CQI corresponding to the previous downlink transmission power to obtain the throughput change value ΔΤΡ1. , notify ΔΤΡ1 of LPN2. At the same time, LPN2 also uses phase In the same way, the change value ΔΤΡ2 of its own throughput is obtained.

LPN2 calculates the change value of the throughput of the communication system in which it is located ΔΤΡ=ΔΤΡ2+ΔΤΡ1. If ΔΤΡ > 0, it indicates that the current downlink transmit power used on CSI-RS2 will not cause performance loss of the communication system; if ΔΤΡ<0, it indicates that the current downlink transmit power used on CSI-RS2 will bring communication. The performance loss of the system, the previous downlink transmit power as the best downlink transmit power.

Of course, the change value of the CQI can also be calculated according to the value of the CQI, and then the current downlink transmit power can be determined according to the change value of the CQI to ensure the performance of the communication system.

S74: The LPN2 determines whether the current downlink transmit power used on the CSI-RS2 reaches a threshold value. If yes, execute S85; otherwise, execute S86.

S75: Update the current downlink transmit power of LPN2 and execute S86.

In the LTE system, the downlink transmit power for the CSI-RS is set relative to the power on each UE on the Physical Downlink Shared Channel (PDSCH). The downlink transmit power for CSI-RS can be up to 8dB higher than PDSCH, and can be at least 15dB lower than PDSCH. It can be judged whether the current downlink transmission power is within this range, and if it is within the range, the downlink transmission power can be continuously updated.

S76: Update LPN2 for the current downlink transmit power used on CSI-RS2.

S77: Increase the value of i by 1 and execute S81.

S78: Determine if i is 0, if yes, execute S89; otherwise, execute S90.

S79: Change the power increase and decrease indication and execute S81.

When i is 0, it indicates that the value of the initial power increase and decrease indication is unreasonable. It is necessary to change the power increase indication, that is, change the direction of adjustment of the downlink transmit power.

S80: The previous downlink transmit power used on the CSI-RS2 is used as the best downlink transmit power of the LPN2, and the process ends.

Embodiment 2:

Still referring to FIG. 6, LPN2 is a base station to be adjusted, and LPN2 is used as an execution body to perform downlink transmission power adjustment. Different from the method in Embodiment 1, the LPN2 is directly adjusted at a selected time (subframe or Part of the symbol within the sub-frame) downlink transmit power, rather than first Transmit power value over the entire CSI-RS. After determining the optimal downlink transmit power, the downlink transmit power of the LPN2 is updated to the optimal downlink transmit power. The specific process is as follows:

The LPN2 notifies the neighboring LPN1 of the current downlink transmit power, and LPN1 and LPN2 use the current downlink transmit power to notify the respective camped UEs to perform CQI measurement, and then receive the value of the CQI fed back by the UE. The LPN1 selects the value of the CQI corresponding to the edge UE from the value of the CQI corresponding to the current downlink transmission power fed back by the UE, and notifies the LPN2 of the value of the selected CQI. At the same time, LPN2 also selects the value of the CQI corresponding to the edge UE in which it resides in the same manner.

The LPN2 compares the value of the CQI corresponding to the edge UE of the LPN1 with the QoS threshold. If the QoS threshold is exceeded, the current downlink transmit power of the LPN2 can ensure the performance of the communication system; otherwise, the current downlink transmit power of the LPN2 cannot Ensure the performance of the communication system, the previous downlink transmit power as the best downlink transmit power.

If the current downlink transmit power of LPN2 can ensure the performance of the communication system, the downlink transmit power can be continuously adjusted, and the above process is repeated until the optimal downlink transmit power is obtained.

Based on the same inventive concept, an embodiment of the present invention provides a device for adjusting downlink transmit power. The structure of the device is as shown in FIG. 8, and includes:

The determining unit 80 is configured to determine, in each candidate base station, a base station to be adjusted.

The obtaining unit 81 is configured to obtain a value or a change value of the performance parameter calculated by each candidate base station, where the value of the performance parameter of each candidate base station is based on the channel quality when the current downlink transmit power is reported by the UE camped by each candidate base station. Calculated by the value of the parameter, the change value of the performance parameter of each candidate base station is calculated according to the value of the channel quality parameter when the current downlink transmit power reported by the UE camped by each candidate base station is used and the previous downlink transmit power is used. .

The updating unit 82 is configured to update the downlink transmit power of the base station to be adjusted according to the obtained value or the change value of the performance parameter calculated by each candidate base station.

Specifically, the determining unit 80 is specifically configured to:

The base station that receives the downlink transmit power adjustment command in each candidate base station is used as the base station to be adjusted; or

Matching the current downlink transmit power in each candidate base station with the value of the base station decision parameter to be adjusted The candidate base station of the criterion is used as the base station to be adjusted.

Specifically, if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following: the current downlink transmit power is the largest and the CQI minimum value is the largest;

If the base station decision parameter is to be adjusted, the setting criterion specifically includes one of the following:

The current downlink transmit power is the largest and the load is the smallest;

The current downlink transmit power is the same and the load is minimum;

If the base station decision parameter is to be the number of UEs to be camped, the setting criteria specifically include the following: the current downlink transmit power is the largest and the number of UEs staying at least is the minimum;

Specifically, the foregoing updating unit 82 is specifically configured to:

Determining, according to the obtained value or the change value of the performance parameter calculated by each candidate base station, whether the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system where the base station is to be adjusted;

If it can be ensured, the current downlink transmit power of the base station to be adjusted is updated according to the set difference.

Specifically, the foregoing updating unit 82 is specifically configured to:

If the performance parameter is CQI, the value of the CQI corresponding to the edge UE is selected from the obtained CQI values, and the value of the selected CQI is compared with the quality of service threshold. If the quality of service threshold is exceeded, the current downlink transmission of the base station to be adjusted is adjusted. Power can ensure the performance of the communication system; otherwise, the current base station to be adjusted The downlink transmit power cannot ensure the performance of the communication system; the edge UE is the UE whose reported CQI value is less than or equal to the set threshold;

If the performance parameter is the throughput, calculate the sum of the changed values of the obtained throughput, and determine whether the sum value is greater than or equal to zero. If the value is greater than or equal to zero, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system; otherwise, Adjusting the current downlink transmit power of the base station does not ensure the performance of the communication system;

If the performance parameter is the load, it is determined whether the value of the obtained load of the base station to be adjusted is less than the load threshold. If the value is less than the load threshold, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system.

Specifically, the updating unit 82 is specifically configured to: update a downlink transmit power of a selected subframe in the base station to be adjusted or a selected symbol in the selected subframe.

Specifically, the updating unit 82 is specifically configured to: for the selected UE that is to be adjusted by the base station to be adjusted, preferably, the updating unit 82 is further configured to update the downlink transmit power of the to-be-adjusted base station, and the update amount of the rate Notify to other candidate base stations other than the base station to be adjusted.

Specifically, the foregoing downlink transmit power adjusting device is a macro base station, a micro base station, or a control device. Based on the same inventive concept, an embodiment of the present invention provides a communication device, and the structure of the communication device is as shown in FIG.

The transceiver 90 is configured to obtain a value or a change value of the performance parameter calculated by each candidate base station, where the value of the performance parameter of each candidate base station is based on the channel quality when the current downlink transmit power is reported by the UE camped by each candidate base station. Calculated by the value of the parameter, the change value of the performance parameter of each candidate base station is calculated according to the value of the channel quality parameter when the current downlink transmit power is reported by the UE camped by each candidate base station and when the previous downlink transmit power is used. ;

The processor 91 is configured to determine a base station to be adjusted in each candidate base station, and update a downlink transmit power of the base station to be adjusted according to the obtained value or a change value of the performance parameter calculated by each candidate base station.

The transceiver 90 and the processor 91 are connected by a bus. Specifically, the foregoing processor 91 is specifically configured to: use, as the to-be-adjusted base station, the base station that receives the downlink transmit power adjustment command in each candidate base station; or set the current downlink transmit power and the value of the base station decision parameter to be adjusted in each candidate base station. The candidate base station that meets the set criteria is used as the base station to be adjusted.

The current downlink transmit power is the same and the load is minimum;

Specifically, the foregoing processor 91 is specifically configured to:

If the performance parameter is CQI, the value of the CQI corresponding to the edge UE is selected from the obtained CQI values, Comparing the value of the selected CQI with the quality of service threshold. If the quality of service threshold is exceeded, the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the communication system. The performance of the edge UE is that the reported CQI value is less than or equal to the set threshold;

Specifically, the foregoing processor 91 is specifically configured to: rate.

Specifically, the foregoing processor 91 is specifically configured to:

The downlink transmit power of the selected symbol in the selected subframe or selected subframe is updated for the selected UE camping on the base station to be adjusted.

Preferably, the processor 91 is further configured to: after updating the downlink transmit power of the base station to be adjusted, the update amount of the rate is notified to other candidate base stations except the base station to be adjusted.

Specifically, the foregoing communication device is a macro base station, a micro base station, or a control device.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.

The present invention is directed to a method, apparatus (system), and computer program according to an embodiment of the present invention. The flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and modifications The spirit and scope of the embodiments of the present invention are departed. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

Rights request

1. A method for adjusting downlink transmission power, characterized by including:

Determine the base station to be adjusted among each candidate base station;

Obtain the value or change value of the performance parameter calculated by each candidate base station. The value of the performance parameter of each candidate base station is based on the current downlink transmit power reported by the user equipment UE resident in each candidate base station. The value of the channel quality parameter is calculated. The change value of the performance parameter of each candidate base station is based on the channel when using the current downlink transmit power and when using the previous downlink transmit power reported by the UE resident in each candidate base station. The value of the quality parameter is calculated;

The downlink transmit power of the base station to be adjusted is updated according to the obtained value or change value of the performance parameter calculated by each candidate base station.

2. The method according to claim 1, characterized in that determining the base station to be adjusted among each candidate base station specifically includes:

The base station that receives the downlink transmit power adjustment instruction among the candidate base stations is used as the base station to be adjusted; or

Among the candidate base stations, the candidate base station whose current downlink transmit power and the value of the base station decision parameter to be adjusted meet the setting criteria is regarded as the base station to be adjusted.

3. The method of claim 2, wherein if the base station decision parameter to be adjusted is a channel quality indicator (CQI), the setting criterion specifically includes one of the following:

The current downlink transmission power is the largest and the minimum value of CQI is the largest;

The current downlink transmit power is the smallest and the minimum CQI value is the smallest;

The current downlink transmit power is the largest and the maximum CQI value is the largest;

If the base station decision parameter to be adjusted is load, the setting criteria specifically include one of the following: The current downlink transmission power is the maximum and the load is the minimum;

The current downlink transmit power is the same and the load is minimal;

If the base station decision parameter to be adjusted is the number of camping UEs, the setting criteria specifically include One of the following:

The current downlink transmission power is the largest and the number of camping UEs is the smallest;

The current downlink transmit power is the smallest and the number of camping UEs is the largest;

The current downlink transmit power is the same and the number of camping UEs is the smallest.

4. The method according to claim 1, characterized in that, updating the downlink transmit power of the base station to be adjusted according to the obtained value or change value of the performance parameter calculated by each candidate base station, specifically including:

According to the obtained value or change value of the performance parameter calculated by each candidate base station, determine whether the current downlink transmit power of the base station to be adjusted can ensure the performance of the communication system where the base station to be adjusted is located;

If it can be ensured, the current downlink transmit power of the base station to be adjusted is updated according to the set difference value.

5. The method according to claim 1, characterized in that, updating the downlink transmit power of the base station to be adjusted according to the obtained value or change value of the performance parameter calculated by each candidate base station, specifically including:

If it cannot be ensured, update the current downlink transmission power of the base station to be adjusted to the previous downlink transmission power.

6. The method according to claim 4 or 5, characterized in that, based on the obtained value or change value of the performance parameter calculated by each candidate base station, it is determined whether the current downlink transmit power of the base station to be adjusted can be adjusted. Ensure the performance of the communication system where the base station to be adjusted is located, specifically including:

If the performance parameter is CQI, select the CQI value corresponding to the edge UE from the obtained CQI value, compare the selected CQI value with the service quality threshold, and if it exceeds the service quality threshold, then the Adjusting the current downlink transmit power of the base station can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system; the edge UE reports a CQI value less than or equal to UE setting threshold; If the performance parameter is throughput, calculate the sum of the obtained throughput change values, and determine whether the sum is greater than or equal to zero. If it is greater than or equal to zero, then the current downlink transmit power of the base station to be adjusted can ensure that the The performance of the communication system; Otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system;

If the performance parameter is load, determine whether the obtained load value of the base station to be adjusted is less than the load threshold. If it is less than the load threshold, then the current downlink transmit power of the base station to be adjusted can ensure the communication system's performance.

7. The method according to any one of claims 1 to 6, characterized in that updating the downlink transmit power of the base station to be adjusted specifically includes: transmit power.

8. The method of claim 7, wherein: updating the selection of the base station to be adjusted is for the selected UE camping on the base station to be adjusted, updating the selected subframe or the selected Downlink transmit power of selected symbols in the subframe.

9. The method according to any one of claims 1 to 8, characterized in that, after updating the downlink transmit power of the base station to be adjusted, it further includes: notifying other parties except the base station to be adjusted of the update amount of the transmit power. Candidate base station.

10. The method according to any one of claims 1 to 9, characterized in that the channel quality parameters include one or a combination of CQI, reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI.

11. A device for adjusting downlink transmission power, characterized in that it includes:

A determining unit, used to determine the base station to be adjusted among the candidate base stations;

The acquisition unit is configured to obtain the value or change value of the performance parameter calculated by each candidate base station. The value of the performance parameter of each candidate base station is based on the current usage reported by the user equipment UE resident in each candidate base station. The values of the channel quality parameters when the downlink transmit power is calculated, each candidate The change value of the performance parameter of the base station is calculated based on the value of the channel quality parameter reported by the UE resident in each candidate base station when the current downlink transmission power is used and when the previous downlink transmission power is used;

An update unit, configured to update the downlink transmit power of the base station to be adjusted according to the obtained value or change value of the performance parameter calculated by each candidate base station.

12. The device according to claim 11, wherein the determining unit is specifically configured to: use the base station that receives the downlink transmit power adjustment instruction among the candidate base stations as the base station to be adjusted; or

13. The device according to claim 12, wherein if the base station decision parameter to be adjusted is a channel quality indicator (CQI), the setting criterion specifically includes one of the following:

The current downlink transmit power is the same and the load is minimal;

14. The device according to claim 11, wherein the update unit is specifically configured to: determine the base station to be adjusted based on the obtained value or change value of the performance parameter calculated by each candidate base station. Can the current downlink transmit power ensure the reliability of the communication system where the base station to be adjusted is located? performance;

15. The device according to claim 11, wherein the update unit is specifically configured to: determine the base station to be adjusted based on the obtained value or change value of the performance parameter calculated by each candidate base station. Whether the current downlink transmit power can ensure the performance of the communication system where the base station to be adjusted is located;

16. The device according to claim 14 or 15, characterized in that the update unit is specifically used to:

If the performance parameter is CQI, select the CQI value corresponding to the edge UE from the obtained CQI value, compare the selected CQI value with the service quality threshold, and if it exceeds the service quality threshold, then the Adjusting the current downlink transmit power of the base station can ensure the performance of the communication system; otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system; the edge UE reports a CQI value less than or equal to UE setting threshold;

If the performance parameter is throughput, calculate the sum of the obtained throughput change values, and determine whether the sum is greater than or equal to zero. If it is greater than or equal to zero, then the current downlink transmit power of the base station to be adjusted can ensure that the The performance of the communication system; Otherwise, the current downlink transmit power of the base station to be adjusted cannot ensure the performance of the communication system;

17. The device according to any one of claims 11 to 16, characterized in that the update unit is specifically used to: transmit power.

18. The device according to claim 17, characterized in that the update unit is specifically used to: For the selected UE camping on the base station to be adjusted, update the downlink transmit power of the selected subframe or the selected symbol in the selected subframe.

19. The device according to any one of claims 11 to 18, wherein the update unit is further configured to, after updating the downlink transmission power of the base station to be adjusted, update the updated downlink transmission power or the updated The update amount of the downlink transmit power relative to the current downlink transmit power is notified to other candidate base stations except the base station to be adjusted.

20. The device according to any one of claims 11 to 19, wherein the channel quality parameters include one of channel quality indicator CQI, reference signal received power RSRP, reference signal received quality RSRQ, received signal strength indicator RSSI, or combination.

21. The device according to any one of claims 11 to 20, characterized in that the device for adjusting the downlink transmission power is a macro base station, a micro base station or a control device.

22. A communication device, characterized by including:

The transceiver is used to obtain the value or change value of the performance parameter calculated by each candidate base station. The value of the performance parameter of each candidate base station is based on the current downlink transmission reported by the user equipment UE resident in each candidate base station. The value of the channel quality parameter when the power is used is calculated. The change value of the performance parameter of each candidate base station is based on the current downlink transmit power and the previous downlink transmit power reported by the UE resident in each candidate base station. Calculated from the value of the channel quality parameter at the time;

A processor, configured to determine the base station to be adjusted among the candidate base stations; and update the downlink transmit power of the base station to be adjusted according to the obtained value or change value of the performance parameter calculated by each candidate base station.

23. The communication device according to claim 22, characterized in that the processor is specifically used to:

Among the candidate base stations, the candidate base station whose current downlink transmit power and the value of the base station decision parameter to be adjusted meet the setting criteria is used as the base station to be adjusted.

24. The communication device according to claim 23, wherein if the base station decision parameter to be adjusted is CQI, the setting criterion specifically includes one of the following:

The current downlink transmit power is the same and the load is minimal;

25. The communication device according to claim 22, characterized in that the processor is specifically used to:

26. The communication device according to claim 22, characterized in that the processor is specifically used to:

27. The communication device according to claim 25 or 26, characterized in that the processor is specifically used to:

28. The communication device according to any one of claims 22 to 27, characterized in that the processor is specifically used to: transmit power.

29. The base station according to claim 28, wherein the processor is specifically configured to: update the selected subframe or the selected UE camping on the base station to be adjusted. Downlink transmit power of selected symbols in the subframe.

30. The communication device according to any one of claims 22 to 29, characterized in that, the processor is further configured to, after updating the downlink transmit power of the base station to be adjusted, update the updated downlink transmit power or the The update amount of the downlink transmit power relative to the current downlink transmit power is notified to other candidate base stations except the base station to be adjusted.

31. The communication device according to any one of claims 22 to 30, characterized in that the channel quality parameters include CQI, reference signal received power RSRP, reference signal received quality RSRQ, received signal Signal strength indicates one or a combination of RSSI.

32. The communication device according to any one of claims 22 to 31, characterized in that the communication device is a macro base station, a micro base station or a control device.