CN117641546A - Method and base station for controlling uplink power of cell edge UE - Google Patents
Method and base station for controlling uplink power of cell edge UE Download PDFInfo
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Abstract
The invention relates to a method and a base station for controlling uplink power of cell edge UE, which are characterized in that by measuring noise interference of each subcarrier of the edge UE, calculating the average value of the noise interference of the subcarrier of the edge UE, comparing the average value with a preset threshold value, and then carrying out targeted power control on the edge UE, the edge UE can be controlled to have reasonable transmitting power, the reliability of services such as data transmission and the like is improved, the interference among cells is reduced, the power consumption of the edge UE is reduced, and the service time is prolonged.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and a base station for controlling uplink power of a cell edge UE.
Background
For OFDM (Orthogonal Frequency Division Multiplexing ) or SC-FDMA (Single-carrier Frequency-Division Multiple Access, single carrier frequency division multiple access) systems, frequency resources used by UEs (User Equipment) in the same physical cell are mutually orthogonal, so long as time and frequency are synchronized, there is no interference between UEs in the same cell, and uplink interference mainly comes from UEs in neighboring cells, especially at the cell edge. According to the traditional power control mode, the edge UE can improve the transmitting power of the edge UE in order to ensure that the signal-to-noise ratio is not lower than the set gate line, and the edge UE is closer to the uplink receiving end of the interfered cell, so that the edge UE has larger interference to the adjacent cell than the central UE.
The conventional method of controlling the power of the edge UE has the following disadvantages:
1. the edge UE has large path loss and large interference, and needs to boost power, but the edge UE is close to the Remote Unit (RU) of the other party, and the signal thereof forms interference to the neighboring UE.
2. The neighboring cell coordination mostly adopts information sharing, and needs to acquire the information of the neighboring cell, so that the system is complex, and the processing time delay is improved.
In view of this, it is necessary to provide a method and apparatus for controlling uplink power of a cell edge UE, which can ensure that the edge UE has reasonable transmit power and improve reliability of services such as data transmission.
Disclosure of Invention
The invention aims to provide a method and a base station for controlling uplink power of cell edge UE, which can accurately acquire modulation and coding modes suitable for the current channel transmission conditions.
In order to solve the above technical problems, the present invention provides a method for controlling uplink power of a cell edge UE, including the following steps:
s1, calculating path loss PL between a UE transmitting end and a base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The method comprises the steps that the maximum transmitting power of the UE is preset, PHR is the power allowance reported by the UE, and RSRP is the reference signal receiving power of the UE;
s2, judging that the path loss PL is higher than a preset threshold value, confirming that the UE is edge UE, measuring single subcarrier noise interference of the edge UE, and calculating a subcarrier noise interference average value of the edge UE;
s3, if the subcarrier noise interference average value is smaller than a preset second threshold value, performing power control according to a preset power control strategy; if the subcarrier noise interference average value is larger than the preset second threshold value and smaller than the preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; and if the subcarrier noise interference average value is larger than the preset first threshold value, not distributing the RB for the edge UE.
Further, the average value of the subcarrier noise interference of the edge UE may be according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Is a single subcarrier noise interference of the edge UE.
Still further, the preset power control strategy includes:
calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to the preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
Further, the preset target signal to noise ratio calculation scheme includes: if the path loss PL is less than 52dB, the target signal-to-noise ratio is equal to 33dB, and if the path loss PL is greater than or equal to 52dB and less than or equal to 76dB, the target signal-to-noise ratio is equal to 85dB minus the path loss PL; if the path loss PL is greater than 76dB and less than or equal to 98dB, the target signal-to-noise ratio is equal to 51.5dB minus one half of the path loss PL; if the path loss PL is greater than 98dB, the target signal-to-noise ratio is equal to 2dB.
Further, the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
In order to solve the technical problem, the invention also provides a base station for controlling the uplink power of the cell edge UE, which comprises a path loss calculation unit, an edge UE judgment unit and a power control unit;
the path loss calculation unit calculates the path loss PL from the UE transmitting end to the base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The method comprises the steps that the maximum transmitting power of the UE is preset, PHR is the power allowance reported by the UE, and RSRP is the reference signal receiving power of the UE;
the edge UE judging unit judges that the path loss PL is higher than a preset threshold value, confirms that the UE is edge UE, measures single subcarrier noise interference of the edge UE, and calculates a subcarrier noise interference average value of the edge UE;
the power control unit is used for performing power control according to a preset power control strategy if the subcarrier noise interference average value is smaller than a preset second threshold value; if the subcarrier noise interference average value is larger than the preset second threshold value and smaller than the preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; and if the subcarrier noise interference average value is larger than the preset first threshold value, not distributing the RB for the edge UE.
Further, the average value of the subcarrier noise interference of the edge UE may be according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Is a single subcarrier noise interference of the edge UE.
Still further, the preset power control strategy includes:
calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to the preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
Further, the preset target signal to noise ratio calculation scheme includes: if the path loss PL is less than 52dB, the target signal-to-noise ratio is equal to 33dB, and if the path loss PL is greater than or equal to 52dB and less than or equal to 76dB, the target signal-to-noise ratio is equal to 85dB minus the path loss PL; if the path loss PL is greater than 76dB and less than or equal to 98dB, the target signal-to-noise ratio is equal to 51.5dB minus one half of the path loss PL; if the path loss PL is greater than 98dB, the target signal-to-noise ratio is equal to 2dB.
Further, the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, by measuring the noise interference of each subcarrier of the edge UE, calculating the average value of the noise interference of the subcarriers of the edge UE, comparing the average value with the preset threshold value, and then carrying out targeted power control on the edge UE, the edge UE can be controlled to have reasonable transmitting power, the reliability of services such as data transmission and the like is improved, the interference among cells is reduced, the power consumption of the edge UE is reduced, and the service time is prolonged.
Drawings
Fig. 1 is a method step diagram of controlling uplink power of a cell edge UE according to an embodiment of the present invention;
fig. 2 is a block diagram of a base station controlling uplink power of a cell edge UE according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged where appropriate to implement in other sequences than those of the embodiments of the invention.
As shown in fig. 1, a method for controlling uplink power of a cell edge UE according to an embodiment of the present invention includes the following steps:
s1, calculating path loss PL between a UE transmitting end and a base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The method comprises the steps that the maximum transmitting power of the UE is preset, PHR is the power allowance reported by the UE, and RSRP is the reference signal receiving power of the UE;
s2, if the path loss PL is judged to be higher than a preset threshold value, confirming that the UE is edge UE, measuring single subcarrier noise interference of the edge UE, and calculating a subcarrier noise interference average value of the edge UE;
s3, if the subcarrier noise interference average value is smaller than a preset second threshold value, performing power control according to a preset power control strategy; if the subcarrier noise interference average value is larger than a preset second threshold value and smaller than a preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; if the average value of the subcarrier noise interference is greater than a preset first threshold value, no RB (Resource Block) is allocated to the edge UE.
In this embodiment, the reference signal received power RSRP (Reference Signal Receiving Power, reference signal received power) of the UE can be measured by the base station, and the UE maximum transmit power P max Preset in the UE hardware parameters.
Specifically, the subcarrier noise interference average value of the edge UE may be according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Single subcarrier noise interference, NI, which is edge UE i Can be measured in real time by a base station.
Specifically, the preset power control strategy includes: calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
In this embodiment, the preset threshold is 80dB, the first threshold is-112 dB, the second threshold is-118 dB, the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
As further shown in fig. 2, the base station for controlling uplink power of a cell edge UE according to the embodiment of the present invention includes a path loss calculation unit, an edge UE judgment unit, and a power control unit.
A path loss calculation unit for calculating the path loss PL from the UE transmitting end to the base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The PHR is the power allowance reported by the UE, and the RSRP is the reference signal receiving power of the UE.
In this embodiment, the reference signal received power RSRP of the UE can be obtained by real-time measurement, and the maximum UE transmit power P max Preset in the UE hardware parameters.
And the edge UE judging unit judges that the path loss PL is higher than a preset threshold value, confirms that the UE is the edge UE, measures single subcarrier noise interference of the edge UE, and calculates a subcarrier noise interference average value of the edge UE.
The power control unit is used for performing power control according to a preset power control strategy if the subcarrier noise interference average value is smaller than a preset second threshold value; if the subcarrier noise interference average value is larger than a preset second threshold value and smaller than a preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; if the average value of the subcarrier noise interference is larger than a preset first threshold value, the RB is not allocated to the edge UE.
Specifically, the subcarrier noise interference average value of the edge UE may be according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Single subcarrier noise interference, NI, which is edge UE i Can be measured in real time by a base station.
Specifically, the preset power control strategy includes:
calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
Specifically, the preset target signal-to-noise ratio calculation scheme includes: if the path loss PL is smaller than 52dB, the target signal-to-noise ratio is equal to 33dB, and if the path loss PL is larger than or equal to 52dB and smaller than or equal to 76dB, the target signal-to-noise ratio is equal to 85dB, and the path loss PL is subtracted; if the path loss PL is more than 76dB and less than or equal to 98dB, the target signal-to-noise ratio is equal to 51.5dB, and one half of the path loss PL is reduced; if the path loss PL is greater than 98dB, then the target signal-to-noise ratio is equal to 2dB.
The power control unit may control the transmit power of the UE by sending a TPC (Transmission Power Control, transmit power control) signaling, where the TPC signaling carries a specific value for reducing or raising the transmit power, and the UE may perform a corresponding operation after receiving the TPC signaling.
In this embodiment, the preset threshold is 80dB, the first threshold is-112 dB, the second threshold is-118 dB, the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
In summary, in the embodiment of the invention, by measuring the noise interference of each subcarrier of the edge UE, calculating the average value of the noise interference of the subcarriers of the edge UE, comparing the average value with the preset threshold value, and then performing targeted power control on the edge UE, the edge UE can be controlled to have reasonable transmitting power, the reliability of services such as data transmission and the like is improved, the interference among cells is reduced, the power consumption of the edge UE is reduced, and the service time is prolonged.
The foregoing examples only illustrate preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that modifications and improvements can be made without departing from the spirit of the invention, such as combining different features of the various embodiments, which are all within the scope of the invention.
Claims (10)
1. A method for controlling uplink power of a cell edge UE, comprising the steps of:
s1, calculating path loss PL between a UE transmitting end and a base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The method comprises the steps that the maximum transmitting power of the UE is preset, PHR is the power allowance reported by the UE, and RSRP is the reference signal receiving power of the UE;
s2, judging that the path loss PL is higher than a preset threshold value, confirming that the UE is edge UE, measuring single subcarrier noise interference of the edge UE, and calculating a subcarrier noise interference average value of the edge UE;
s3, if the subcarrier noise interference average value is smaller than a preset second threshold value, performing power control according to a preset power control strategy; if the subcarrier noise interference average value is larger than the preset second threshold value and smaller than the preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; and if the subcarrier noise interference average value is larger than the preset first threshold value, not distributing the RB for the edge UE.
2. The method for controlling uplink power of cell edge UE according to claim 1, wherein the average value of subcarrier noise interference of the edge UE can be expressed according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Is a single subcarrier noise interference of the edge UE.
3. The method for controlling uplink power of a cell edge UE according to claim 1, wherein the preset power control policy includes:
calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to the preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
4. The method for controlling uplink power of a cell edge UE according to claim 3, wherein the preset target signal to noise ratio calculation scheme includes: if the path loss PL is less than 52dB, the target signal-to-noise ratio is equal to 33dB, and if the path loss PL is greater than or equal to 52dB and less than or equal to 76dB, the target signal-to-noise ratio is equal to 85dB minus the path loss PL; if the path loss PL is greater than 76dB and less than or equal to 98dB, the target signal-to-noise ratio is equal to 51.5dB minus one half of the path loss PL; if the path loss PL is greater than 98dB, the target signal-to-noise ratio is equal to 2dB.
5. A method of controlling uplink power of a cell edge UE according to claim 3, wherein the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
6. The base station for controlling the uplink power of the cell edge UE is characterized by comprising a path loss calculation unit, an edge UE judgment unit and a power control unit;
the path loss calculation unit calculates the path loss PL from the UE transmitting end to the base station antenna receiving end; wherein pl=p max –PHR–RSRP，P max The method comprises the steps that the maximum transmitting power of the UE is preset, PHR is the power allowance reported by the UE, and RSRP is the reference signal receiving power of the UE;
the edge UE judging unit judges that the path loss PL is higher than a preset threshold value, confirms that the UE is edge UE, measures single subcarrier noise interference of the edge UE, and calculates a subcarrier noise interference average value of the edge UE;
the power control unit is used for performing power control according to a preset power control strategy if the subcarrier noise interference average value is smaller than a preset second threshold value; if the subcarrier noise interference average value is larger than the preset second threshold value and smaller than the preset first threshold value, correspondingly reducing the power of the edge UE according to one half of the difference value between the subcarrier noise interference average value and the preset second threshold value; and if the subcarrier noise interference average value is larger than the preset first threshold value, not distributing the RB for the edge UE.
7. The base station for controlling uplink power of cell edge UE according to claim 6, wherein the average value of subcarrier noise interference of the edge UE can be expressed according to the formula:calculating to obtain; wherein, NI Average of Is the average value of the subcarrier noise interference of the edge UE, M is the total RB number of the edge UE, and NI i Is a single subcarrier noise interference of the edge UE.
8. The base station for controlling uplink power of a cell edge UE according to claim 6, wherein the preset power control strategy comprises:
calculating a target signal-to-noise ratio according to the path loss PL and a preset target signal-to-noise ratio calculation scheme; if the difference value between the target signal-to-noise ratio and the current measured signal-to-noise ratio is smaller than or equal to a preset fifth threshold value, correspondingly reducing the power of the edge UE according to the preset fifth threshold value; if the power of the edge UE is larger than or equal to a preset fourth threshold value and smaller than a preset third threshold value, correspondingly lifting the power of the edge UE according to the preset fourth threshold value; and if the power of the edge UE is larger than or equal to the preset third threshold value, correspondingly lifting the power of the edge UE according to the preset third threshold value.
9. The base station for controlling uplink power of a cell edge UE according to claim 8, wherein the preset target signal to noise ratio calculation scheme comprises: if the path loss PL is less than 52dB, the target signal-to-noise ratio is equal to 33dB, and if the path loss PL is greater than or equal to 52dB and less than or equal to 76dB, the target signal-to-noise ratio is equal to 85dB minus the path loss PL; if the path loss PL is greater than 76dB and less than or equal to 98dB, the target signal-to-noise ratio is equal to 51.5dB minus one half of the path loss PL; if the path loss PL is greater than 98dB, the target signal-to-noise ratio is equal to 2dB.
10. The base station for controlling uplink power of a cell edge UE according to claim 8, wherein the third threshold is 3dB, the fourth threshold is 1dB, and the fifth threshold is 1dB.
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