CN103298092A - Power distributing method, device and system - Google Patents

Abstract

The invention provides a power distributing method, device and system. The power distributing method comprises the steps of obtaining channel information, on an nth frequency resource and an mth frequency resource, of user equipment, determining the vector Kn of interference transmitted by base stations in a first base station set on the nth frequency resource to downlinks of M frequency resources occupied by a second base station, the signal interference noise ratio reciprocal vector wn of the user equipment, served by the base stations in the first base station set, on the nth frequency resource and the channel gain vector An of the user equipment of the base stations in the first base station set and the first base station on the nth frequency resource, and determining an optimal emitting power, of the base stations in the first base station set, on the nth frequency resource when the value of interference transmitted by the base stations in the first base station set to the downlinks of the M frequency resources of the second base station, on N frequency resources is less than or equal to a preset interference threshold and the total transmission volume, of the base stations in the first base station set, on N frequency resources reaches a maximum value.

Description

Power distribution method, device and system

Technical Field

The present invention relates to communications technologies, and in particular, to a power allocation method, device, and system.

Background

With the continuous development of mobile communication, various multimedia services are combined with mobile communication, and the requirement of a user for the transmission rate of mobile communication is higher and higher, in order to meet the increasing demand of high-speed data transmission, improve the utilization rate of frequency spectrum resources, and enhance the capacity of a system, more Access points (Access points) are deployed in a wireless communication system to obtain frequency multiplexing gain similar to cell splitting. The access points are divided into high power base stations and low power base stations. The low power base station is also called a capacity station or a small base station. In general, the transmission power of the high power node is greater than that of the capacity station, and the coverage area of the high power base station may be greater than that of the low power base station. The high power Base Station may be a Macro Base Station (Macro BS for short), the low power Base Station may also be a capacity Station, and may be a Micro Base Station (Micro BS for short), a Pico Base Station (Pico BS for short), a Home Base Station (Femto/Home Base Station), a Relay Base Station (Relay Base Station), a Radio remote head (RRH for short), and the like. Different access points are suitable for different application scenarios. After the low power base station is introduced into the network, the interference situation of the network is more complicated.

The current power allocation method of the low power base station is suitable for a scene that only one low power cell exists in a high power cell. When a plurality of low power cells coexist, the interference situation is complicated. Taking a case where a plurality of Pico cells and Macro cells coexist, the interference includes mutual interference between the Pico cells and mutual interference between the Macro cells and the Pico cells. In the downlink transmission, the downlink transmission of the Macro BS to the user equipment of the Pico BS and the downlink transmission of the Pico BS to the user equipment user of the Macro BS generate serious interference. The Pico BS also has interference to user equipments in other Pico cells. Therefore, the power allocation method of each low power base station in a heterogeneous network in which a plurality of low power cells coexist with one high power base station cannot be adopted.

Disclosure of Invention

The embodiment of the invention provides a power distribution method, a device and a system, which are used for solving the problem of power distribution of each base station in a base station set in a heterogeneous network when the base station belonging to the same base station set coexists with another base station.

In one aspect, an embodiment of the present invention provides a power allocation method, including:

acquiring channel information of user equipment on an nth frequency resource and an mth frequency resource, wherein the channel information of the user equipment comprises channel gains of the user equipment of a base station in a first base station set and the base station in the first base station set on the nth frequency resource, channel gains of the user equipment of the base station in the first base station set and a second base station on the mth frequency resource, and channel gains of the user equipment of the second base station and the base station in the first base station set on the mth frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

determining, according to the obtained channel information, an interference vector K for downlink transmission of M frequency resources occupied by the base station in the first base station set on the nth frequency resource to the second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A between a user equipment of a base station in the first set of base stations and the first base station on the nth frequency resource_n；

According to the determined interference vector K_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining the optimal transmitting power of the base station in the first base station set on the nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

and informing the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

In another aspect, an embodiment of the present invention provides a power distribution apparatus. The method comprises the following steps:

an obtaining module, configured to obtain channel information of a user equipment on an nth frequency resource and an mth frequency resource, where the channel information of the user equipment includes a channel gain on the nth frequency resource between a user equipment of a base station in a first base station set and the base station in the first base station set, a channel gain on the mth frequency resource between a user equipment of a base station in the first base station set and a second base station, and a channel gain on the mth frequency resource between a user equipment of the second base station and the base station in the first base station set; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

an interference determining module, configured to determine, according to the obtained channel information, an interference vector K for downlink transmission of M frequency resources occupied by the second base station on the nth frequency resource by a base station in the first base station set_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A between a user equipment of a base station in the first set of base stations and the first base station on the nth frequency resource_n；

A power determination module for determining the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining the optimal transmitting power of the base station in the first base station set on the nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

a sending module, configured to notify the base stations in the first base station set of the optimal transmit power on the nth frequency resource according to the optimal transmit power vector of the base station in the first base station set on the nth frequency resource.

In another aspect, an embodiment of the present invention further provides a ue, configured to report channel information to a base station serving the ue;

when the user equipment is user equipment of a base station in a first base station set, channel information of the user equipment includes channel gain of the user equipment and the base station serving for the user equipment in the first base station set on an nth frequency resource, channel gain of the user equipment and the base station not serving for the user equipment in the first base station set on the nth frequency resource, and channel gain of the user equipment and a second base station on an mth frequency resource;

when the user equipment is user equipment of a second base station, channel information of the user equipment comprises channel gains of the user equipment and base stations in the first base station set on an m-th frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station.

In another aspect, an embodiment of the present invention further provides a power allocation method, including:

the method comprises the steps that a first user device reports channel information of the first user device to a service base station of the first user device; the first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set; the channel information of the first user equipment comprises channel gains of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gains of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gains of the first user equipment and a second base station on an mth frequency resource;

the second user equipment reports the channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

the service base station of the first user equipment reports the channel information of the first user equipment to a power distribution device;

the second base station reports the channel information of the second user equipment to the power distribution device;

the power allocation device determines, according to the channel information of the first user equipment and the channel information of the second user equipment, an interference vector K for downlink transmission of M frequency resources occupied by the second base station on the nth frequency resource by the base stations in the first base station set_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n；

The power distribution device determines the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining that the first base station set has a maximum total transmission capacity on the N frequency resources when the interference value of the base station in the first base station set on the N frequency resources for downlink transmission of the M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is metAn optimal transmission power vector of a base station in a base station set on an nth frequency resource;

and the power allocation device informs the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

In another aspect, an embodiment of the present invention further provides a power distribution system, including:

the first user equipment is used for reporting the channel information of the first user equipment to a service base station of the first user equipment; the first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set; the channel information of the first user equipment comprises channel gains of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gains of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gains of the first user equipment and a second base station on an mth frequency resource;

the second user equipment is configured to report channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

a base station of a first user equipment, configured to report channel information of the first user equipment to a power allocation apparatus;

the second base station is used for reporting the channel information of the second user equipment to the power distribution device;

the power distribution apparatus includes: the device comprises an acquisition module, an interference determination module, a power determination module and a sending module;

an obtaining module, configured to obtain channel information of the first user equipment and channel information of the second user equipment; the interference determining module is configured to determine, according to the channel information of the first user equipment and the channel information of the second user equipment, an interference vector K for downlink transmission of M frequency resources occupied by the base station in the first base station set on the nth frequency resource to the second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n；

A power determination module for determining the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining an optimal transmission power vector of a base station in the first base station set on an nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of a second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

a sending module, configured to notify the base stations in the first base station set of the optimal transmit power on the nth frequency resource according to the optimal transmit power vector of the base station in the first base station set on the nth frequency resource.

In the power allocation method, device and system of the embodiment of the invention, in the heterogeneous network when the second base station and the base station in the first base station set coexist, when the power allocating means allocates the optimal transmission power of the nth frequency resource to the base stations in the first set of base stations coexisting with the second base station, instead of separately determining the transmission power of one base station, but according to the interference of the base stations in the first base station set on the nth frequency resource to all the M frequency resources occupied by the second base station, the interference of the second base station on all the M frequency resources to the nth frequency resource of the base stations in the first base station set, the interference of the base stations in the first base station set on the nth frequency resource to the nth frequency resources of other base stations in the first base station set, and determining the transmission power of each base station in the first base station, wherein the distribution of the transmission power of each base station is related to the distribution of the transmission power of other base stations. Therefore, the power allocation method provided by the embodiment of the invention can improve the total transmission throughput of the base stations in the first base station set, and can reduce unnecessary power consumption of the base stations in the first base station set. When the base station in the first base station set works with the optimal transmission power on the nth frequency resource, the interference value of the base station in the first base station set on all the N frequency resources to downlink transmission of the M frequency resources of the second base station does not exceed the preset interference threshold, and the total transmission capacity of the base station in the first base station set on all the N frequency resources occupied by the base station can be maximized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flowchart of a power allocation method according to an embodiment of the present invention;

fig. 2 is a flowchart of another power allocation method according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating the use of frequency bands of a Macro base station and a Pico base station according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a power distribution apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another power distribution apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a power distribution system according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a flowchart of a power allocation method according to an embodiment of the present invention. The execution main body power allocation device of this embodiment may be located in the second base station or in the network side entity. As shown in fig. 1, the present embodiment includes:

step 11: acquiring channel information of user equipment on an nth frequency resource and an mth frequency resource, wherein the channel information of the user equipment comprises channel gains of the user equipment of a base station in a first base station set and the base station in the first base station set on the nth frequency resource, channel gains of the user equipment of the base station in the first base station set and a second base station on the mth frequency resource, and channel gains of the user equipment of the second base station and the base station in the first base station set on the mth frequency resource.

In this embodiment, the total number of frequency resources occupied by the base stations in the first base station set is N, and the total number of frequency resources occupied by the second base station set is M. Wherein N and M are both positive integers. The frequency resources may comprise physical resource blocks, subbands, carriers, or subcarriers. The first set of base stations may include one base station or may include a plurality of base stations. The base stations in the first set of base stations may be in the coverage area of the second base station, or in the edge zone of the coverage area of the second base station, i.e. the base stations in the first set of base stations are outside the coverage area of the second base station and in the area adjacent to the coverage area of the second base station. Optionally, in this embodiment, the base stations in the first set of base stations may be low-power base stations, the second base station may be a high-power base station, and the base stations in the first set of base stations are within the coverage of the second base station. This embodiment mainly describes a power allocation method of a base station in an operating state in a first base station set on one frequency resource in a heterogeneous network when the base station in the first base station set coexists with a second base station.

For clarity and simplicity of description, in various embodiments of the present invention, a user equipment served by each base station in the first set of base stations is referred to as a first user equipment, a user equipment served by the second base station is referred to as a second user equipment, a base station serving a certain first user equipment in the first set of base stations is referred to as a serving base station of the first user equipment, and a base station not serving the first user equipment in the first set of base stations is referred to as a non-serving base station of the first user equipment.

When the base stations in the first base station set coexist with the second base station, the user equipment served by the base stations in the first base station set has a cognitive function to perform spectrum sensing, and the frequency resources not occupied by the second base station are used for performing data transmission with the serving base station of the first user equipment. In this case, the interference on the downlink mainly includes interference of the base station in the first set of base stations to the second user equipment, interference of the base station in the first set of base stations to the user equipment served by other base stations in the first set of base stations, and interference of the second base station to the first user equipment. In order to enable the power allocation apparatus to allocate the optimal power to the nth frequency resource for the base station in the first set of base stations, the channel information of the following user equipment needs to be obtained: channel gain on the nth frequency resource between the first user equipment and a base station in the first set of base stations, channel gain on the mth frequency resource between the first user equipment and the second base station, and channel gain on the mth frequency resource between the second user equipment and a base station in the first set of base stations. The channel gain of the first user equipment and a base station in the first base station set on the nth frequency resource comprises the channel gain of the first user equipment and a serving base station of the first user equipment on the nth frequency resource and the channel gain of the first user equipment and a non-serving base station of the first user equipment on the nth frequency resource.

The first user equipment may report the following channel information to a serving base station of the first user equipment: channel gain on the nth frequency resource for the first user equipment and a base station within the first set of base stations, and channel gain on the mth frequency resource for the first user equipment and the second base station. And after receiving the channel information, the serving base station of the first user equipment sends the channel information to a power distribution device. The second user equipment may report the following channel information to the second base station: and the second user equipment and the first base station gain the channel on the mth frequency resource, and the second base station sends the channel information to the power distribution device.

Step 12: according to the obtained channel information, determining an interference vector K of downlink transmission of M frequency resources occupied by a base station in a first base station set on an nth frequency resource to a second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd channel gain vector A of user equipment of base stations in the first base station set and the first base station on nth frequency resource_n。

The power distribution device determines the following vectors according to the acquired channel information: interference vector K formed by interference of each base station in the first base station set on the nth frequency resource to downlink transmission of M frequency resources occupied by the second base station_nThe reciprocal vector w of SINR formed by reciprocal SINR of user equipment served by each base station in the first set of base stations on the nth frequency resource_nA channel gain vector A formed by the user equipment of each base station in the first base station set and the channel gain of the first base station on the nth frequency resource_n。

Step 13: according to the determined interference vector K_nSINR reciprocal vector w_nSum channel gain vector A_nWithin the first set of base stationsThe optimal transmitting power vector of the base station in the first base station set on the nth frequency resource is determined under the condition that the interference value of the base station on the N frequency resources to downlink transmission of the M frequency resources of the second base station is smaller than or equal to the preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum.

Distributing power means on the basis of the determined interference vector K_nSINR reciprocal vector w_nSum channel gain vector A_nWhen determining the optimal transmission power of the base stations in the first base station set on the nth frequency resource, considering the interference of the base stations in the first base station set on the downlink transmission of the M frequency resources of the second base station on the N frequency resources and the total transmission capacity of the base stations in the first base station set on the N frequency resources. When the base stations in the first base station set work at the nth frequency resource with the optimal transmitting power, the interference value of the base stations in the first base station set on the N frequency resources for downlink transmission of the M frequency resources of the second base station does not exceed a preset interference threshold, and the total transmission capacity of the base stations in the first base station set on the N frequency resources can be maximized.

Step 14: and informing the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

The means for allocating power informs the base stations in the first set of base stations of the optimal transmit power on the nth frequency resource each. And the base stations in the first base station set communicate with the served user equipment according to the optimal transmitting power on the nth frequency resource allocated by the power allocation device. If the power distribution device is located in a second base station, the second base station sends the optimal transmitting power on the nth frequency resource to the base stations in the first base station set through an X-2 interface; if the power allocation apparatus is located in the network side entity, the network side entity sends the optimal transmit power on the nth frequency resource to the base stations in the first set of base stations through the S1 interface. Wherein, the X-2 interface is an interface between the base station and the base station, and the S1 interface is an interface between the base station and the network side entity.

Further, the transmission power may be periodically allocated to the base stations in the first set of base stations, or may be non-periodically allocated to the base stations in the first set of base stations. When the transmission power is periodically distributed, the power distribution device periodically determines the transmission power of each base station in the first base station set according to the acquired channel information of the user equipment, so that the transmission power of each base station is periodically adjusted. In each power allocation time interval, the user equipment of the base station in the first base station set carries out frequency perception, the base in the first base station set dynamically selects the frequency resource not occupied by the second base station for data transmission, and meanwhile, the power allocation device carries out optimal transmission power allocation on the base stations in the first base station set according to the obtained channel information of the user equipment and informs the optimal transmission power to each base station. For example, the adjustment time interval of power allocation, i.e., the power allocation period, is T, T ═ x TTI; TTI is the transmission time interval, x is a positive integer. The value of x can be set according to the channel condition, and if the channel fading is flat, a larger value of x can be set; if the channel fading is changing faster, a smaller value of x is set. The selection of x is required to enable the power adjustment during the T time period to meet the channel variation requirement. If T is too large, the power adjustment is too slow, and the power adjustment cannot meet the requirement of channel change; too small a T will result in frequent power adjustments, increasing system load.

In the embodiment of the present invention, when a second base station coexists with a base station in a first base station set in a heterogeneous network, and an optimal transmission power of an nth frequency resource is allocated to a base station in the first base station set coexisting with the second base station, a power allocation apparatus does not determine the transmission power of one base station individually, but determines the transmission power of each base station in the first base station set simultaneously according to interference of the base station in the first base station set on the nth frequency resource to all M frequency resources occupied by the second base station, interference of the second base station on all M frequency resources to the nth frequency resource of the base station in the first base station set, and interference of the base station in the first base station set on the nth frequency resource to nth frequency resources of other base stations in the first base station set. Therefore, the power allocation method provided by the embodiment of the invention can improve the total transmission throughput of the base stations in the first base station set, and can reduce unnecessary power consumption of the base stations in the first base station set. In the embodiment of the present invention, when the base station in the first base station set operates at the optimal transmission power on the nth frequency resource, the interference value of the base station in the first base station set to downlink transmission of the M frequency resources of the second base station on all N frequency resources does not exceed the preset interference threshold, and the total transmission capacity of the base station in the first base station set on all N frequency resources occupied can be maximized.

Fig. 2 is a flowchart of another power allocation method according to an embodiment of the present invention. Fig. 3 is a schematic diagram of frequency band usage of a Macro base station and a Pico base station according to an embodiment of the present invention. In this embodiment, the base stations in the first base station set are Pico base stations, and the second base station is a Macro base station. This embodiment illustrates a power allocation method for each Pico base station in the first set of base stations when the Pico base station coexists with one Macro base station. The method described in this embodiment can be applied to other scenarios where a low power base station and a high power base station coexist. The power distribution apparatus in this embodiment is located within a Macro base station.

As shown in fig. 3, the number of frequency bands used by the Pico base station after dynamic spectrum selection is the same as the number of frequency bands used by the Macro base station, and the Pico base station performs dynamic spectrum selection and uses subcarriers not occupied by Macro for data transmission. The Macro base station occupies M frequency bands, B₁，B₂，...，B_MEach Pico base station has N (N < X) total OFDM subcarriers which can be used, and X is the total number of the OFDM subcarriers occupied by the Pico base station and the Macro base station. The continuous subcarriers occupied by the Pico base station form M cognitive frequency bands: CR band 1, CR band 2. The Macro base station and the Pico base station adopt the same OFDM multiple access mode. Similarly, the power allocation method provided by this embodiment is also suitable for a scenario where the number of frequency bands used by the Pico base station is different from the number of frequency bands used by the Macro base station。

Step 21: the Macro base station acquires channel information of the user equipment.

And the user equipment of the Pico base station performs spectrum sensing and performs data transmission with the Pico base station by using the sub-carrier not occupied by the Macro base station. The user equipment of the Pico base station sends the following channel information to the Pico base station serving itself through a wireless channel: the channel gain of the user equipment and the served Pico base station on the nth sub-carrier, the channel gain of the user equipment and the non-served Pico base station on the nth sub-carrier, and the channel gain of the user equipment and the Macro base station on the mth frequency band. The Pico base station transfers the channel information to the Macro base station. The channel information reported to the Macro base station by the user equipment of the Macro base station is as follows: and the user equipment and each Pico base station have channel gain in the mth frequency band. For example, the user equipment of the Pico base station a reports the channel information to the Pico base station a, and the Pico base station a transmits the channel information of the served user equipment to the Macro base station; the user equipment of the Pico base station B reports the channel information to the Pico base station B, and the Pico base station B transmits the channel information of the served user equipment to the Macro base station

Step 22: the Macro base station determines an interference vector K according to the acquired channel information_nThe SINR reciprocal vector w_nAnd the channel gain vector A_n。

$w_n=\left(\begin{array}{c}\frac{1}{{\mathrm{\&chi;}}_{1,\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">n</figure-callout>}}}\\ \frac{1}{{\mathrm{\&chi;}}_{2,n}}\\ .\\ .\\ .\\ \frac{1}{{\mathrm{\&chi;}}_{K,n}}\end{array}\right),$ ${\mathrm{<figure-callout\; id="1"\; label="K\; n"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">K</figure-callout>}}_n\left(\begin{array}{c}\frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">K</figure-callout>}}_{1,\mathrm{<figure-callout\; id="1"\; label="n\; m"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">n</figure-callout>}}^m}\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">K</figure-callout>}}_{2,n}^m}\\ .\\ .\\ .\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{K,n}^m}\end{array}\right)$

K is the total number of Pico base stations in the first base station set; when k is equal to l, the process is repeated,

represents the kth Pico base station in the first base station set and the users served by the base stationChannel gain of the device at the nth subcarrier; when k is not equal to l, the ratio,

representing channel gains of an nth subcarrier of user equipment served by an ith Pico base station in the first base station set and a kth Pico base station in the first base station set; lambda is greater than 0.

χ_k，nIndicating the signal-to-interference-and-noise ratio of the user equipment served by the kth Pico base station in the first base station set on the nth sub-carrier,

representing the noise on the nth subcarrier of the kth Pico base station in said first set of base stations,

representing interference of the Macro base station on the nth sub-carrier on the mth frequency band to the user equipment served by the kth Pico base station in the first base station set. In particular, the amount of the solvent to be used,

determined according to equation 1:

$J_{k,n}^m(d_{\mathrm{nm}},P_{\mathrm{MBS}})={\left|h_{k,m}^{\mathrm{ps}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}-\mathrm{\&Delta;f}/2}^{d_{\mathrm{nm}}+\mathrm{\&Delta;f}/2}E\left\{I_N\left(w\right)\right\}\mathrm{dw}$ (formula 1)

Wherein,

channel gain on mth frequency band for user equipment of kth Pico base station in the second base station and the first base station set, d_nmRepresenting the frequency interval between the nth subcarrier and the mth frequency band, af being the bandwidth of each subcarrier in the kth Pico base station in the first set of base stations,

wherein, the parameter M refers to the processing procedure of M-point FFT, and the expression of the formula E { I (w) } refers to the procedure of M-point FFT; w denotes the angular frequency, there is a quantitative relationship between w and f, w ═ 2 × pi × f.

And the interference of the nth subcarrier of the kth Pico base station in the first base station set to the mth frequency band of the Macro base station is represented. In particular, the amount of the solvent to be used,

determined according to equation 2:

$K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df}$ (formula 2)

Wherein,

can be expressed by equation 3:

$I_{k,n}^m(d_{\mathrm{nm}},p_{k,n})={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{p}_{k,n}{T}_s{\&Integral;}_{d_{\mathrm{nm}}-B_m/2}^{d_{\mathrm{nm}}+B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df}$ (formula 3)

Wherein p is_k，nRepresents the transmission power of the kth base station in the first base station set on the nth sub-carrier,

channel gain on an m-th frequency band for user equipment served by a k-th base station and the Macro base station in the first base station set; b is_mDenotes the bandwidth of the mth frequency band, T_sRepresents the length of a single Orthogonal Frequency Division Multiple access (OFDM) symbol, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band.

Step 23: macro base station according to formula

And

determining that the interference value of each Pico base station on N sub-carriers to M frequency band downlink transmissions of the Macro base station is less than or equal to a preset interference threshold I_thAnd when the total transmission capacity R of all the Pico base stations on the N subcarriers reaches the maximum, the optimal transmitting power vector p consisting of the optimal transmitting power of all the Pico base stations on the nth subcarrier_n。

Can be combined with

Conversion to K linear equations, and

a linear equation set having K +1 linear equations is formed. The number of unknowns is K +1, and the number of linear equations is K +1, so that the linear equation set can be solved. Wherein p is_nFor an optimal transmit power vector consisting of the optimal transmit powers of the Pico base stations in said first set of base stations on the nth subcarrier, I_thIs a preset interference threshold.

Further, if there are a total of Q Pico base stations in the Macro base station coverage, at t₁At time K Pico works and at t₂And newly adding S Pico base stations at the moment. If t is₂-t₁T is less than or equal to T, the two moments are in different power distribution periods. Time t₁In the first period, the power distribution device can detect that K Pico base stations work simultaneously, and carry out power distribution on the K working Pico base stations to obtain the transmitting power of the K Pico base stations on each subcarrier; time t₂In the second period, detecting that K + S Pico base stations work simultaneously, and performing power distribution on the K + S Pico to obtain the transmitting power of the K + S Pico in each subcarrier. The invention is also applicable to the scenario that there are Q total Pico base stations in the coverage area of the Macro base station and at the time t₁There are K Pico operations and at time t₂The system newly shuts down S Pico base stations. Let t₂-t₁Not more than T, time T₁In the first period, the power distribution device can detect that K Pico base stations work simultaneously, and carry out power distribution on the K working Pico base stations to obtain the transmitting power of the K Pico base stations on each subcarrier; time t₂And in the second period, detecting that K-S Pico base stations work simultaneously, and performing power distribution on the K-S Pico to obtain the transmitting power of the K-S Pico in each subcarrier.

Step 24: if the optimal transmission power vector p_nThe vector with the optimal transmitting power less than zero exists, and the vector with the optimal transmitting power less than zero in the optimal transmitting power vector is set to be zero.

The optimal transmitting power vector obtained by final solution is as follows:

if p is_nIf there is a negative value, thenSetting negative value to zero, and p_nThe method for setting the negative value as zero is that the subcarrier with the transmission power less than zero is recorded as n^*(ii) a Pico base station is k^*Resetting A_nAnd K_nIs composed of $\left\{\begin{array}{c}{A}_{n^{*}}(k^{*},:)=0\\ A_{n^{*}}(k^{*},K^{*})=1\end{array}\right.$ And $K_{n^{*}}\left(k^{*}\right)=1/{\mathrm{\&lambda;g}}_{n^{*}}\left(k^{*}\right).$

step 25: and determining the total transmission throughput R of the K Pico base stations on the N subcarriers according to the optimal transmitting power vector.

The total transmission throughput R of K Pico base stations on N sub-carriers is

Wherein R is_k，n＝log₂(1+γ_k，n(p_k，n) Is the transmission throughput of the kth Pico base station on the nth sub-carrier. Gamma ray_k，n(p_k，n) For the signal-to-interference-and-noise ratio, gamma, of the kth Pico base station on the nth subcarrier_k，n(p_k，n) Can be expressed by equation 4:

${\mathrm{\&gamma;}}_{k,n}\left(p_{k,n}\right)=\frac{p_{k,n}{g}_{k,n}^k}{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m+\underset{s=1,s\&NotEqual;n}{\overset{N}{\mathrm{\&Sigma;}}}{F}_{k,s}^n}$ (formula 4)

Wherein,

representing the noise on the nth subcarrier of the kth Pico base station in said first set of base stations,

representing interference of the Macro base station on the nth sub-carrier on the mth frequency band to the user equipment served by the kth Pico base station in the first base station set.

Indicating that the s sub-carrier of the k Pico base station is at the second position of the user equipment served by the k Pico base stationInterference of n subcarriers. As can be seen from equation 3, the SINR of the nth subcarrier in the kth Pico base station is related to the adjacent channel interference of the adjacent subcarriers of the Pico base station, the adjacent channel interference of the Macro base station to the nth subcarrier, and the same channel interference of the adjacent Pico cell. Considering that the transmission power of the Pico base station is low, for example, in the LTE/LTE-a system, the transmission power of the Pico base station may be 1 watt, and the transmission power of the Macro base station may be 40 watts, so that the adjacent channel interference of the Pico base station itself will be much smaller than the adjacent channel interference of the Macro cell to the Pico base station, and therefore the influence of the adjacent channel interference of the Pico base station itself can be ignored, that is, the influence of the adjacent channel interference of the Pico base station itself can be ignored

Thus gamma_k，n(p_k，n) Can be expressed by equation 5:

${\mathrm{\&gamma;}}_{k,n}\left(p_{k,n}\right)=\frac{p_{k,n}{g}_{k,n}^k}{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}$ (formula 5)

Step 26: and according to the optimal transmitting power vector, the Macro base station sends the optimal transmitting power of the Pico base station on the nth subcarrier to the Pico base station through an S1 interface.

And the Macro base station sends the optimal transmitting power of each Pico base station on the nth sub-carrier to each Pico base station through an S1 interface. The Macro base station transmits the optimal transmission power to the Pico base station B and the Pico base station a through the S1 interface, respectively.

Simulation experiments compared the curves of the total throughput of all Pico base stations for the following three cases: when the power distribution method provided by the embodiment is adopted, the total throughput of all the Pico base stations; no cooperation exists between Pico cells, and the interference threshold of each Pico base station to the Macro base station is I_th(vi)/3, total throughput of all Pico base stations; the throughput of all the Pico base stations when each subcarrier of each Pico base station is equally power distributed. As can be seen from the simulation result graph, the power allocation method provided in this embodiment significantly improves the system performance, because the neighboring interference between neighboring Pico base stations is considered, and if the cooperation between the neighboring Pico base stations is not considered, the neighboring interference has a large influence on each other, so that the total influence is influencedThroughput.

In this embodiment, when allocating the optimal transmission power of the nth sub-carrier to a plurality of operating Pico base stations coexisting with the Macro base station, the power allocation apparatus does not determine the transmission power of one Pico base station individually, but determines the transmission power of each Pico base station simultaneously according to the interference of each Pico base station on the nth frequency resource of all M frequency resources occupied by the Macro base station, the interference of each Pico base station on the nth frequency resource of each Pico base station on all M frequency resources, and the interference of each Pico base station on the nth frequency resource of other Pico base stations, where the transmission power allocated by each Pico base station is related to the transmission power allocated by other Pico base stations. Therefore, the power distribution method provided by the embodiment of the invention can improve the total transmission throughput of all the Pico base stations and simultaneously can reduce unnecessary power consumption of the Pico base stations. In the embodiment of the invention, when the Pico base station works with the optimal transmitting power on the nth frequency resource, the interference value of all the Pico base stations on all the N frequency resources to the downlink transmission of the M frequency resources of the Macro base station does not exceed the preset interference threshold, and the total transmission capacity of all the Pico base stations on all the N frequency resources occupied can be maximized.

The following description

Andthe derivation process of (1). The purpose of this embodiment is that the interference value of each Pico base station to downlink transmission of M frequency bands of the Macro base station on N subcarriers is less than or equal to a preset interference threshold I_thAnd under the condition that the total transmission capacity R of all the Pico base stations on the N subcarriers reaches the maximum, determining the optimal transmitting power of each Pico base station on the nth subcarrier, wherein the optimal transmitting power can be expressed by the following objective function and condition function:

the objective function is: $\max \underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{\log }_2(1+{\mathrm{\&gamma;}}_{k,n}\left(p_{k,n}\right));$

the first conditional function is: p is a radical of_k，n≥0

The second conditional function is: $\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}{I}_{k,n}^m\&le;I_{\mathrm{th}};$

the parameters in the objective function and the conditional function can be seen in equations 1 to 5. The problem of solving the above objective function can be solved using optimization theory, as follows.

The objective function is p_k，nThe constraint should satisfy the kkt (karushkuhn tucker) condition. Introducing Lagrange multipliers mu for the first and second constraints respectively_k，nAnd λ, the KKT condition can be obtained as,

μ_k，nis not less than 0, lambda is not less than 0 (formula 6)

${\mathrm{\&mu;}}_{k,n}{p}_{k,n}=0,\mathrm{\&lambda;}(\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}{I}_{k,n}^m-I_{\mathrm{th}})=0$ (formula 7)

$\frac{1}{\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}+p_{k,n}}+{\mathrm{\&mu;}}_{k,n}-\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}=0$ (formula 8)

Can set $K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df},$ From equation (8), μ_k，nCan be expressed as:

${\mathrm{\&mu;}}_{k,n}=\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m\frac{1}{\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}+p_{k,n}}$ (formula 9)

Substituting equation 9 into equations 6 and 7 can result in equations 10 and 11:

$\frac{p_{k,n}}{\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}+p_{k,n}}-{\mathrm{\&lambda;p}}_{k,n}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m=0$ (formula 10)

$\frac{1}{(\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}+p_{k,n})\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m}\&le;\mathrm{\&lambda;}$ (formula 11)

The equation (11) is discussed in two cases to obtain the optimal power distribution

If it is not $\mathrm{\&lambda;}<1/\left(\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m\right),$ Because it should satisfy $\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m>0$ And p is_k，n> 0, otherwise, it contradicts the condition (equation 11), and thus the optimum transmission power

Equation 12 should be satisfied:

$p_{k,n}^{*}=\frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m}-\frac{{\mathrm{\&sigma;}}_{k.\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}$ (formula 12)

If it is not $\mathrm{\&lambda;}<1/\left(\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m\right),$ Then p is not likely to be obtained_k，n> 0 because the condition (equation 10) is not satisfied. Therefore, only $\mathrm{\&lambda;}<1/\left(\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m\right)$ The following results can be obtained:

$p_{k,n}^{*}=0$ (formula 13)

Thus, the solution for the optimal transmit power is,

$p_{k,n}^{*}=\max \{0,\frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{k,n}^m}-\frac{{\mathrm{\&sigma;}}_{k,\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">n</figure-callout>}}^2+\underset{l=1,l\&NotEqual;k}{\overset{K}{\mathrm{\&Sigma;}}}{p}_{l,n}{g}_{k,n}^l+\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{J}_{k,n}^m}{g_{k,n}^k}\}$ (formula 14)

As can be seen from the equation (12),

and p_l，n(l ≠ k) related, i.e. the transmission power of the kth Pico base stationThe allocation is related to the ith Pico base station as a result of the cooperation of the Pico base stations. To obtain a simpler expression, equation (12) can be modified as:

(formula 15)

The formula (15) is expressed as each matrix form,

as can be seen from equations (11) and (12), λ > 0, and therefore the above objective function should satisfy

The maximum total transmission throughput of the Pico cell, i.e.

Fig. 4 is a schematic structural diagram of a power distribution apparatus according to an embodiment of the present invention. As shown in fig. 4, the present embodiment includes: an acquisition module 41, an interference determination module 42, a power determination module 43 and a transmission module 44.

An obtaining module 41, configured to obtain channel information of a user equipment on an nth frequency resource and an mth frequency resource, where the channel information of the user equipment includes channel gains of the user equipment of a base station in a first base station set and the base station in the first base station set on the nth frequency resource, channel gains of the user equipment of the base station in the first base station set and a second base station on the mth frequency resource, and channel gains of the user equipment of the second base station and the base station in the first base station set on the mth frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station. Further, the frequency resources include physical resource blocks, frequency bands, sub-bands, carriers, or subcarriers.

An interference determining module 42, configured to determine, according to the obtained channel information, an interference vector K for downlink transmission of M frequency resources occupied by the base station in the first base station set on the nth frequency resource to the second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A between a user equipment of a base station in the first set of base stations and the first base station on the nth frequency resource_n；

A power determination module 43 for determining the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining that when an interference value of a base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and a total transmission capacity of the base station in the first base station set on the N frequency resources reaches a maximum, an optimal transmission power of the base station in the first base station set on an nth frequency resource;

a sending module 44, configured to notify base stations in the first set of base stations of the optimal transmit power on the nth frequency resource. Further, the sending module 44 is specifically configured to send the optimal transmit power on the nth frequency resource to the base stations in the first set of base stations through an X-2 interface or an S1 interface.

As shown in fig. 5, on the basis of fig. 4, the method further includes: and a setting module 45, configured to, if there is a base station with an optimal transmit power smaller than zero in the optimal transmit power vector. And setting the optimal transmitting power of the base station with the optimal transmitting power less than zero in the optimal transmitting power vector to be zero.

The power distribution device provided by the embodiment of the invention can improve the total transmission throughput of the base stations in the first base station set, and can reduce unnecessary power consumption of the base stations in the first base station set. In the embodiment of the present invention, when the base station in the first base station set operates at the optimal transmission power on the nth frequency resource, the interference value of the base station in the first base station set to downlink transmission of the M frequency resources of the second base station on all N frequency resources does not exceed the preset interference threshold, and the total transmission capacity of the base station in the first base station set on all N frequency resources occupied can be maximized.

Further, the power determining module 43 is specifically configured to determine the optimal transmit power of the base stations in the first set of base stations on the nth frequency resource according to the following formula: the frequency resource occupied by the second base station is a frequency band, and the frequency resource occupied by the base stations in the first base station set is a subcarrier;

$A_n\&CenterDot;p_n+w_n=\frac{1}{\mathrm{\&lambda;}{K}_n};$

$\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{p}_n^T\&CenterDot;K_n<=I_{\mathrm{th}};$

wherein p is_nFor a vector consisting of the optimal transmit powers on the nth sub-carriers for the base stations in the first set of base stations, λ > 0, I_thAnd the preset interference threshold is set.

In particular, channel gain vector a_nThe following were used:

wherein K is the total number of base stations in the first set of base stations; when k is equal to l, the process is repeated,

representing the channel gain of the kth base station in the first base station set and the user equipment served by the kth base station in the nth subcarrier; when k is not equal to l, the ratio,

and the channel gain of the nth sub-carrier of the user equipment served by the ith base station in the first base station set and the kth base station in the first base station set is represented.

In particular, the interference vector K_nThe following were used:

${\mathrm{<figure-callout\; id="1"\; label="K\; n"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">K</figure-callout>}}_n\left(\begin{array}{c}\frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">K</figure-callout>}}_{1,\mathrm{<figure-callout\; id="1"\; label="n\; m"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">n</figure-callout>}}^m}\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000138259570000031.png"\; state="\{\{state\}\}">K</figure-callout>}}_{2,n}^m}\\ .\\ .\\ .\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{K,n}^m}\end{array}\right),$

representing interference of the nth subcarrier of the kth base station in the first base station set to the mth frequency band of the second base station.

In particular, the SINR reciprocal vector w_nThe following were used:

$w_n=\left(\begin{array}{c}\frac{1}{{\mathrm{\&chi;}}_{1,\mathrm{<figure-callout\; id="1"\; label="n"\; filenames="HDA0000138259570000021.png"\; state="\{\{state\}\}">n</figure-callout>}}}\\ \frac{1}{{\mathrm{\&chi;}}_{2,n}}\\ .\\ .\\ .\\ \frac{1}{{\mathrm{\&chi;}}_{K,n}}\end{array}\right),$

wherein,χ_k，nrepresenting the signal-to-interference-and-noise ratio of the user equipment served by the kth base station in the first base station set on the nth sub-carrier,

representing noise on the nth subcarrier of the kth base station in the first set of base stations,

represents interference of the second base station on the mth frequency band to the user equipment served by the kth base station in the first base station set.

The embodiment of the invention also provides the user equipment. The user equipment is used for reporting channel information to a base station serving the user equipment.

When the ue is a ue of a base station in a first base station set, the channel information of the ue includes channel gains of the ue and the base station serving itself in the first base station set on an nth frequency resource, channel gains of the ue and the base station not serving itself in the first base station set on an nth frequency resource, and channel gains of the ue and a second base station on an mth frequency resource. In addition, the user equipment of the base stations in the first base station set has a cognitive function to perform spectrum sensing, and performs data transmission with the base stations in the first base station set by using frequency resources not occupied by the second base station.

When the user equipment is user equipment of a second base station, channel information of the user equipment comprises channel gains of the user equipment and base stations in the first base station set on an m-th frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station.

After the power allocation device respectively acquires the channel information of the user equipment through the base station and the second base station in the first base station set, the optimal transmitting power of the base station in the first base station set on the nth frequency resource is determined.

The following embodiments illustrate the interaction process between the user equipment, the base station and the power distribution apparatus:

the first step is as follows: the user equipment reports the channel information to the base station serving itself. The first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set.

The method comprises the steps that first user equipment reports channel information of the first user equipment to a service base station of the first user equipment; the channel information of the first user equipment includes channel gain of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gain of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gain of the first user equipment and a second base station on an mth frequency resource.

The second user equipment reports channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station.

The second step is that: and the base station in the first base station set and the second base station respectively upload the channel information reported by the user equipment to the power distribution device.

For the service base station of the first user equipment, reporting the channel information of the first user equipment to a power distribution device;

and for the second base station, reporting the channel information of the second user equipment to the power distribution device.

The third step: and the power distribution device calculates the optimal transmitting power of each base station in the first base station set according to the acquired channel information. The specific allocation method of the power allocation device is as follows:

the power allocation device determines, according to the channel information of the first user equipment and the channel information of the second user equipment, an interference vector K for downlink transmission of M frequency resources occupied by the second base station on the nth frequency resource by the base stations in the first base station set_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n。

The power distribution device determines the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nAnd determining an optimal transmission power vector of the base station in the first base station set on the nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum.

And the power allocation device informs the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

Fig. 6 is a schematic structural diagram of a power distribution system according to an embodiment of the present invention. As shown in fig. 6, the system provided by the present embodiment includes: a first user equipment 61, a second user equipment 62, a base station 63 within the first set of base stations, a second base station 64 and a power allocation means 65. The power distribution device 65 includes: the device comprises an acquisition module, an interference determination module, a power determination module and a sending module.

The first user equipment 61 is configured to report channel information of the first user equipment to a serving base station of the first user equipment; the first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set; the channel information of the first user equipment includes channel gain of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gain of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gain of the first user equipment and a second base station on an mth frequency resource.

The second user equipment 62 is configured to report channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station.

A base station 63 in the first base station set, configured to report the channel information of the served first user equipment to a power allocation apparatus.

And the second base station 64 is configured to report channel information of the second user equipment to the power distribution apparatus.

The power distribution device 65 includes the following modules:

an obtaining module, configured to obtain channel information of the first user equipment and channel information of the second user equipment.

The interference determining module is configured to determine, according to the channel information of the first user equipment and the channel information of the second user equipment, an interference vector K for downlink transmission of M frequency resources occupied by the base station in the first base station set on the nth frequency resource to the second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n。

The power determination module is used for determining the interference vector K according to the determined interference vector_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nAnd determining an optimal transmission power vector of the base station in the first base station set on the nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum.

The sending module is configured to notify the base stations in the first base station set of the optimal transmit power on the nth frequency resource according to the optimal transmit power vector of the base station in the first base station set on the nth frequency resource.

Specific functions of the user equipment, each base station, and the power allocation apparatus may be described in the embodiments corresponding to fig. 1, fig. 2, and fig. 3, and are not described herein again.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (36)

1. A method of power allocation, comprising:

acquiring channel information of user equipment on an nth frequency resource and an mth frequency resource, wherein the channel information of the user equipment comprises channel gains of the user equipment of a base station in a first base station set and the base station in the first base station set on the nth frequency resource, channel gains of the user equipment of the base station in the first base station set and a second base station on the mth frequency resource, and channel gains of the user equipment of the second base station and the base station in the first base station set on the mth frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

determining, according to the obtained channel information, an interference vector K for downlink transmission of M frequency resources occupied by the base station in the first base station set on the nth frequency resource to the second base station_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A between a user equipment of a base station in the first set of base stations and the first base station on the nth frequency resource_n；

According to the determined interference vector K_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining an optimal transmission power vector of a base station in the first base station set on an nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

and informing the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

2. The method of claim 1, wherein the first set of base stations comprises a single base station or a plurality of base stations; and the base stations in the first base station set are low-power base stations, and the second base station is a high-power base station.

3. The method of claim 2, further comprising, after determining an optimal transmit power vector for base stations in the first set of base stations on an nth frequency resource:

and if the vector with the optimal transmitting power less than zero exists in the optimal transmitting power vector, setting the vector with the optimal transmitting power less than zero as zero.

4. A method according to claim 1, 2 or 3, wherein the frequency resources comprise physical resource blocks, frequency bands, sub-bands, carriers or sub-carriers.

5. The method according to claim 1, 2 or 3, wherein the frequency resources occupied by the second base station are frequency bands, and the frequency resources occupied by the base stations in the first set of base stations are subcarriers; determining an optimal transmit power on an nth frequency resource for a base station within the first set of base stations according to the following formula:

$A_n\&CenterDot;p_n+w_n=\frac{1}{\mathrm{\&lambda;}{K}_n};$

$\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{p}_n^T\&CenterDot;K_n<=I_{\mathrm{th}};$

wherein p is_nFor a vector consisting of the optimal transmit powers on the nth sub-carriers for the base stations in the first set of base stations, λ > 0, I_thAnd the preset interference threshold is set.

6. Method according to claim 5, characterized in that said interference vector K_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nRespectively as follows:

$w_n=\left(\begin{array}{c}\frac{1}{{\mathrm{\&chi;}}_{1,n}}\\ \frac{1}{{\mathrm{\&chi;}}_{2,n}}\\ .\\ .\\ .\\ \frac{1}{{\mathrm{\&chi;}}_{K,n}}\end{array}\right),$

wherein K is the total number of base stations in the first set of base stations; when k is equal to l, the process is repeated,

representing the channel gain of the kth base station in the first base station set and the user equipment served by the kth base station in the nth subcarrier; when k is not equal to l, the ratio,

representing channel gains of an nth subcarrier of user equipment served by an ith base station in the first base station set and a kth base station in the first base station set;

wherein,χ_k，nrepresenting the signal-to-interference-and-noise ratio of the user equipment served by the kth base station in the first base station set on the nth sub-carrier,

representing noise on the nth subcarrier of the kth base station in the first set of base stations,

representing interference on an m-th frequency band by the second base station to user equipment served by a k-th base station in the first set of base stations;

wherein,

representing interference of the nth subcarrier of the kth base station in the first base station set to the mth frequency band of the second base station.

7. The method of claim 6, wherein:

$J_{k,n}^m(d_{\mathrm{nm}},P_{\mathrm{MBS}})={\left|h_{k,m}^{\mathrm{ps}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}-\mathrm{\&Delta;f}/2}^{d_{\mathrm{nm}}+\mathrm{\&Delta;f}/2}E\left\{I_N\left(w\right)\right\}\mathrm{dw},$

wherein, $E\left\{I_N\left(w\right)\right\}=\frac{1}{2\mathrm{\&pi;M}}{\&Integral;}_{-\mathrm{\&pi;}}^{\mathrm{\&pi;}}{\mathrm{\&phi;}}_{P_{\mathrm{MBS}}}\left(e^{\mathrm{jw}}\right){\left(\frac{\sin (w-\mathrm{\&psi;})M/2}{\sin (w-\mathrm{\&psi;})}\right)}^2\mathrm{d\&psi;},$

channel gain on m frequency band for user equipment of k base station in the second base station and the first base station set, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band,_Δfthe bandwidth of each subcarrier in the kth base station in the first base station set.

8. The method of claim 6, wherein:

$K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein, $I_{k,n}^m(d_{\mathrm{nm}},p_{k,n})={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{p}_{k,n}{T}_s{\&Integral;}_{d_{\mathrm{nm}}-B_m/2}^{d_{\mathrm{nm}}+B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein p is_k，nRepresents the transmission power of the kth base station in the first base station set on the nth sub-carrier,

for the first base station setChannel gain of a kth base station and user equipment served by the second base station on an mth frequency band; b is_mDenotes the bandwidth of the mth frequency band, T_sDenotes the length of a single OFDM symbol, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band.

9. The method according to claim 2, wherein the step of informing the base stations in the first base station set of the optimal transmit power on the nth frequency resource comprises:

transmitting the optimal transmit power on the nth frequency resource to base stations within the first set of base stations over an X-2 interface or an S1 interface.

10. A user equipment, configured to report channel information to a base station serving the user equipment;

when the user equipment is user equipment of a base station in a first base station set, channel information of the user equipment includes channel gain of the user equipment and the base station serving for the user equipment in the first base station set on an nth frequency resource, channel gain of the user equipment and the base station not serving for the user equipment in the first base station set on the nth frequency resource, and channel gain of the user equipment and a second base station on an mth frequency resource;

when the user equipment is user equipment of a second base station, channel information of the user equipment comprises channel gains of the user equipment and base stations in the first base station set on an m-th frequency resource; the N is a positive integer smaller than N, the N is a total number of frequency resources occupied by the base stations in the first base station set, the M is a positive integer smaller than M, and the M is a total number of frequency resources occupied by the second base station.

11. A power distribution apparatus, comprising:

an obtaining module, configured to obtain channel information of a user equipment on an nth frequency resource and an mth frequency resource, where the channel information of the user equipment includes a channel gain on the nth frequency resource between a user equipment of a base station in a first base station set and the base station in the first base station set, a channel gain on the mth frequency resource between a user equipment of a base station in the first base station set and a second base station, and a channel gain on the mth frequency resource between a user equipment of the second base station and the base station in the first base station set; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

an interference determining module, configured to determine, according to the obtained channel information, an interference vector K for downlink transmission of M frequency resources occupied by the second base station on the nth frequency resource by a base station in the first base station set_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A between a user equipment of a base station in the first set of base stations and the first base station on the nth frequency resource_n；

A power determination module for determining the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining an optimal transmission power vector of a base station in the first base station set on an nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

a sending module, configured to notify the base stations in the first base station set of the optimal transmit power on the nth frequency resource according to the optimal transmit power vector of the base station in the first base station set on the nth frequency resource.

12. The apparatus of claim 11, further comprising: and the setting module is used for setting the vector with the optimal transmitting power less than zero in the optimal transmitting power vector as zero if the vector with the optimal transmitting power less than zero exists in the optimal transmitting power vector.

13. The apparatus of claim 11 or 12, wherein the sending module is specifically configured to send the optimal transmit power on the nth frequency resource to the base stations in the first set of base stations through an X-2 interface or an S1 interface.

14. The apparatus of claim 11 or 12, wherein the frequency resources comprise physical resource blocks, frequency bands, sub-bands, carriers, or subcarriers.

15. The apparatus of claim 11, wherein the power determining module is specifically configured to determine the optimal transmit power of the base stations in the first set of base stations on the nth frequency resource according to the following formula: the frequency resource occupied by the second base station is a frequency band, and the frequency resource occupied by the base stations in the first base station set is a subcarrier;

$A_n\&CenterDot;p_n+w_n=\frac{1}{\mathrm{\&lambda;}{K}_n};$

$\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{p}_n^T\&CenterDot;K_n<=I_{\mathrm{th}};$

wherein p is_nFor a vector consisting of the optimal transmit powers on the nth sub-carriers for the base stations in the first set of base stations, λ > 0, I_thAnd the preset interference threshold is set.

16. The apparatus of claim 15, wherein the interference vector K is_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nRespectively as follows:

$w_n=\left(\begin{array}{c}\frac{1}{{\mathrm{\&chi;}}_{1,n}}\\ \frac{1}{{\mathrm{\&chi;}}_{2,n}}\\ .\\ .\\ .\\ \frac{1}{{\mathrm{\&chi;}}_{K,n}}\end{array}\right),$ $K_n\left(\begin{array}{c}\frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{1,n}^m}\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{2,n}^m}\\ .\\ .\\ .\\ \frac{1}{\mathrm{\&lambda;}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}{K}_{K,n}^m}\end{array}\right)$

wherein K is the total number of base stations in the first set of base stations; when k is equal to l, the process is repeated,

representing the channel gain of the kth base station in the first base station set and the user equipment served by the kth base station in the nth subcarrier; when k is not equal to l, the ratio,

representing channel gains of an nth subcarrier of user equipment served by an ith base station in the first base station set and a kth base station in the first base station set;

wherein,χ_k，nrepresenting the signal-to-interference-and-noise ratio of the user equipment served by the kth base station in the first base station set on the nth sub-carrier,representing noise on the nth subcarrier of the kth base station in the first set of base stations,

representing interference on an m-th frequency band by the second base station to user equipment served by a k-th base station in the first set of base stations;

wherein,

representing interference of the nth subcarrier of the kth base station in the first base station set to the mth frequency band of the second base station.

17. The apparatus of claim 16, wherein:

$J_{k,n}^m(d_{\mathrm{nm}},P_{\mathrm{MBS}})={\left|h_{k,m}^{\mathrm{ps}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}-\mathrm{\&Delta;f}/2}^{d_{\mathrm{nm}}+\mathrm{\&Delta;f}/2}E\left\{I_N\left(w\right)\right\}\mathrm{dw},$

wherein, $E\left\{I_N\left(w\right)\right\}=\frac{1}{2\mathrm{\&pi;M}}{\&Integral;}_{-\mathrm{\&pi;}}^{\mathrm{\&pi;}}{\mathrm{\&phi;}}_{P_{\mathrm{MBS}}}\left(e^{\mathrm{jw}}\right){\left(\frac{\sin (w-\mathrm{\&psi;})M/2}{\sin (w-\mathrm{\&psi;})}\right)}^2\mathrm{d\&psi;},$

channel gain on m frequency band for user equipment of k base station in the second base station and the first base station set, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band,_Δfthe bandwidth of each subcarrier in the kth base station in the first base station set.

18. The apparatus of claim 16, wherein:

$K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein, $I_{k,n}^m(d_{\mathrm{nm}},p_{k,n})={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{p}_{k,n}{T}_s{\&Integral;}_{d_{\mathrm{nm}}-B_m/2}^{d_{\mathrm{nm}}+B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein p is_k，nRepresents the transmission power of the kth base station in the first base station set on the nth sub-carrier,

channel gain on an m-th frequency band for user equipment served by a kth base station and the second base station in the first base station set; b is_mDenotes the bandwidth of the mth frequency band, T_sDenotes the length of a single OFDM symbol, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band.

19. A method of power allocation, comprising:

the method comprises the steps that a first user device reports channel information of the first user device to a service base station of the first user device; the first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set; the channel information of the first user equipment comprises channel gains of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gains of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gains of the first user equipment and a second base station on an mth frequency resource;

the second user equipment reports the channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

the service base station of the first user equipment reports the channel information of the first user equipment to a power distribution device;

the second base station reports the channel information of the second user equipment to the power distribution device;

the power allocation device determines, according to the channel information of the first user equipment and the channel information of the second user equipment, an interference vector K for downlink transmission of M frequency resources occupied by the second base station on the nth frequency resource by the base stations in the first base station set_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n；

The power distribution device determines the interference vector K according to_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining an optimal transmission power vector of a base station in the first base station set on an nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

and the power allocation device informs the base stations in the first base station set of the optimal transmitting power on the nth frequency resource according to the optimal transmitting power vector of the base stations in the first base station set on the nth frequency resource.

20. The method of claim 19, wherein the first set of base stations comprises a single base station or a plurality of base stations; and the base stations in the first base station set are low-power base stations, and the second base station is a high-power base station.

21. The method of claim 20, further comprising, after determining the optimal transmit power on the nth frequency resource for the base stations in the first set of base stations:

and if the vector with the optimal transmitting power less than zero exists in the optimal transmitting power vector, setting the vector with the optimal transmitting power less than zero as zero.

22. The method of claim 19, 20 or 21, wherein the frequency resources comprise physical resource blocks, frequency bands, sub-bands, carriers or subcarriers.

23. The method according to claim 19, 20 or 21, wherein the frequency resources occupied by the second base station are frequency bands, and the frequency resources occupied by the base stations in the first set of base stations are subcarriers; determining an optimal transmit power on an nth frequency resource for a base station within the first set of base stations according to the following formula:

$A_n\&CenterDot;p_n+w_n=\frac{1}{\mathrm{\&lambda;}{K}_n};$

$\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{p}_n^T\&CenterDot;K_n<=I_{\mathrm{th}};$

wherein p is_nFor a vector consisting of the optimal transmit powers on the nth sub-carriers for the base stations in the first set of base stations, λ > 0, I_thAnd the preset interference threshold is set.

24. The method of claim 23, wherein the interference vector K is_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nRespectively as follows:

wherein K is the total number of base stations in the first set of base stations; when k is equal to l, the process is repeated,

representing the channel gain of the kth base station in the first base station set and the user equipment served by the kth base station in the nth subcarrier; when k is not equal to l, the ratio,

representing channel gains of an nth subcarrier of user equipment served by an ith base station in the first base station set and a kth base station in the first base station set;

wherein,

χ_k，nrepresenting the signal-to-interference-and-noise ratio of the user equipment served by the kth base station in the first base station set on the nth sub-carrier,

representing noise on the nth subcarrier of the kth base station in the first set of base stations,

representing interference on an m-th frequency band by the second base station to user equipment served by a k-th base station in the first set of base stations;

wherein,

representing interference of the nth subcarrier of the kth base station in the first base station set to the mth frequency band of the second base station.

25. The method of claim 24, wherein:

$J_{k,n}^m(d_{\mathrm{nm}},P_{\mathrm{MBS}})={\left|h_{k,m}^{\mathrm{ps}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}-\mathrm{\&Delta;f}/2}^{d_{\mathrm{nm}}+\mathrm{\&Delta;f}/2}E\left\{I_N\left(w\right)\right\}\mathrm{dw},$

wherein, $E\left\{I_N\left(w\right)\right\}=\frac{1}{2\mathrm{\&pi;M}}{\&Integral;}_{-\mathrm{\&pi;}}^{\mathrm{\&pi;}}{\mathrm{\&phi;}}_{P_{\mathrm{MBS}}}\left(e^{\mathrm{jw}}\right){\left(\frac{\sin (w-\mathrm{\&psi;})M/2}{\sin (w-\mathrm{\&psi;})}\right)}^2\mathrm{d\&psi;},$

channel gain on m frequency band for user equipment of k base station in the second base station and the first base station set, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band,_Δfthe bandwidth of each subcarrier in the kth base station in the first base station set.

26. The method of claim 25, wherein:

$K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein, $I_{k,n}^m(d_{\mathrm{nm}},p_{k,n})={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{p}_{k,n}{T}_s{\&Integral;}_{d_{\mathrm{nm}}-B_m/2}^{d_{\mathrm{nm}}+B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein p is_k，nRepresents the transmission power of the kth base station in the first base station set on the nth sub-carrier,

channel gain on an m-th frequency band for user equipment served by a kth base station and the second base station in the first base station set; b is_mDenotes the bandwidth of the mth frequency band, T_sDenotes the length of a single OFDM symbol, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band.

27. The method according to claim 26, wherein informing the base stations in the first set of base stations of the optimal transmit power on the nth frequency resource is:

transmitting the optimal transmit power on the nth frequency resource to base stations within the first set of base stations over an X-2 interface or an S1 interface.

28. A power distribution system, comprising:

the first user equipment is used for reporting the channel information of the first user equipment to a service base station of the first user equipment; the first user equipment is user equipment served by each base station in a first base station set, and a serving base station of the first user equipment is a base station served by the first user equipment in the first base station set; the channel information of the first user equipment comprises channel gains of the first user equipment and a serving base station of the first user equipment on an nth frequency resource, channel gains of the user equipment and a non-serving base station of the first user equipment on the nth frequency resource, and channel gains of the first user equipment and a second base station on an mth frequency resource;

the second user equipment is configured to report channel information of the second user equipment to the second base station: the second user equipment is user equipment served by a second base station, and the channel information of the second user equipment comprises channel gains of the second user equipment and base stations in the first base station set on an m-th frequency resource; n is a positive integer smaller than N, N is a total number of frequency resources occupied by base stations in the first set of base stations, M is a positive integer smaller than M, and M is a total number of frequency resources occupied by the second base station;

a base station of a first user equipment, configured to report channel information of the first user equipment to a power allocation apparatus;

the second base station is used for reporting the channel information of the second user equipment to the power distribution device;

the power distribution apparatus includes: the device comprises an acquisition module, an interference determination module, a power determination module and a sending module;

the acquiring module is configured to acquire channel information of the first user equipment and channel information of the second user equipment;

the interference determining module is configured to determine, according to the channel information of the first user equipment and the channel information of the second user equipment, that the base stations in the first base station set perform downlink transmission on the nth frequency resource for the M frequency resources occupied by the second base stationInterference vector K of_nThe SINR reciprocal vector w of the user equipment served by the base station in the first set of base stations on the nth frequency resource_nAnd a channel gain vector A on the nth frequency resource for the first user equipment and base stations in the first set of base stations_n；

The power determination module is used for determining the interference vector K according to the determined interference vector_nThe SINR reciprocal vector w_nAnd the channel gain vector A_nDetermining an optimal transmission power vector of a base station in the first base station set on an nth frequency resource under the condition that the interference value of the base station in the first base station set on N frequency resources for downlink transmission of M frequency resources of the second base station is less than or equal to a preset interference threshold and the total transmission capacity of the base station in the first base station set on the N frequency resources is maximum;

the sending module is configured to notify the base stations in the first base station set of the optimal transmit power on the nth frequency resource according to the optimal transmit power vector of the base station in the first base station set on the nth frequency resource.

29. The system of claim 28, wherein the first set of base stations comprises a single base station or a plurality of base stations; and the base stations in the first base station set are low-power base stations, and the second base station is a high-power base station.

30. The system of claim 29, wherein the power distribution apparatus further comprises: and the setting module is used for setting the vector with the optimal transmitting power less than zero as zero if the vector with the optimal transmitting power less than zero exists in the optimal transmitting power vector.

31. The system according to claim 28, 29 or 30, wherein the frequency resources comprise physical resource blocks, frequency bands, sub-bands, carriers or sub-carriers.

32. The system according to claim 28, 29 or 30, wherein the power determination module is specifically configured to determine the optimal transmit power of the base stations in the first set of base stations on the nth frequency resource according to the following formula: the frequency resource occupied by the second base station is a frequency band, and the frequency resource occupied by the base stations in the first base station set is a subcarrier;

$A_n\&CenterDot;p_n+w_n=\frac{1}{\mathrm{\&lambda;}{K}_n};$

$\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{p}_n^T\&CenterDot;K_n<=I_{\mathrm{th}};$

wherein p is_nFor a vector consisting of the optimal transmit powers on the nth sub-carriers for the base stations in the first set of base stations, λ > 0, I_thAnd the preset interference threshold is set.

33. The system of claim 32, wherein the interference vector K is_nThe SINR reciprocal vectorw_nAnd the channel gain vector A_nRespectively as follows:

wherein K is the total number of base stations in the first set of base stations; when k is equal to l, the process is repeated,

representing the channel gain of the kth base station in the first base station set and the user equipment served by the kth base station in the nth subcarrier; when k is not equal to l, the ratio,

representing channel gains of an nth subcarrier of user equipment served by an ith base station in the first base station set and a kth base station in the first base station set;

wherein,

χ_k，nrepresenting the signal-to-interference-and-noise ratio of the user equipment served by the kth base station in the first base station set on the nth sub-carrier,

representing noise on the nth subcarrier of the kth base station in the first set of base stations,

indicating that the second base station is paired with the first base station on the m-th frequency bandInterference of user equipment served by a kth base station in the set;

wherein,representing interference of the nth subcarrier of the kth base station in the first base station set to the mth frequency band of the second base station.

34. The system of claim 33, wherein:

$J_{k,n}^m(d_{\mathrm{nm}},P_{\mathrm{MBS}})={\left|h_{k,m}^{\mathrm{ps}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}-\mathrm{\&Delta;f}/2}^{d_{\mathrm{nm}}+\mathrm{\&Delta;f}/2}E\left\{I_N\left(w\right)\right\}\mathrm{dw},$

wherein, $E\left\{I_N\left(w\right)\right\}=\frac{1}{2\mathrm{\&pi;M}}{\&Integral;}_{-\mathrm{\&pi;}}^{\mathrm{\&pi;}}{\mathrm{\&phi;}}_{P_{\mathrm{MBS}}}\left(e^{\mathrm{jw}}\right){\left(\frac{\sin (w-\mathrm{\&psi;})M/2}{\sin (w-\mathrm{\&psi;})}\right)}^2\mathrm{d\&psi;},$

channel gain on m frequency band for user equipment of k base station in the second base station and the first base station set, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band,_Δfthe bandwidth of each subcarrier in the kth base station in the first base station set.

35. The system of claim 34, wherein:

$K_{k,n}^m=\frac{{\&PartialD;I}_{k,n}^m}{{\&PartialD;p}_{k,n}}={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{\&Integral;}_{d_{\mathrm{nm}}+B_m/2}^{d_{\mathrm{nm}}-B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein, $I_{k,n}^m(d_{\mathrm{nm}},p_{k,n})={\left|h_{k,m}^{\mathrm{sp}}\right|}^2{p}_{k,n}{T}_s{\&Integral;}_{d_{\mathrm{nm}}-B_m/2}^{d_{\mathrm{nm}}+B_m/2}{\left(\frac{{\sin \mathrm{\&pi;fT}}_s}{{\mathrm{\&pi;fT}}_s}\right)}^2\mathrm{df};$

wherein p is_k，nRepresents the kth base station in the first base station setThe transmit power of the base station on the nth subcarrier,

channel gain on an m-th frequency band for user equipment served by a kth base station and the second base station in the first base station set; b is_mDenotes the bandwidth of the mth frequency band, T_sDenotes the length of a single OFDM symbol, d_nmIndicating the frequency separation between the nth subcarrier and the mth frequency band.

36. The system according to claim 35, wherein the base stations in the first set of base stations are informed of the optimal transmit power on the nth frequency resource specifically:

transmitting the optimal transmit power on the nth frequency resource to base stations within the first set of base stations over an X-2 interface or an S1 interface.

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