CN104023382B - Poewr control method and base station in co-channel full duplex system - Google Patents

Abstract

The application provides a power control method and a base station in a same-frequency full-duplex system. The method includes: the base station broadcasts the transmission power and transmission mode of the uplink reference signal to each UE, and each uplink UE sends an uplink reference signal according to the transmission power and transmission mode of the uplink reference signal; the base station receives M pairs of signals sent by any downlink UE. The UE ID of the uplink UE with the smallest interference level of the downlink UE, according to the uplink path loss of each uplink UE, the path loss between each uplink UE and the downlink UE, and the downlink path loss of the downlink UE, in the M uplink The UE selects an uplink UE paired with the downlink UE, sends the matched uplink transmission power to the uplink UE, and sends a service to the downlink UE according to the matched downlink transmission power, and the M is an integer greater than 1. The invention can reduce the interference between the uplink and downlink services in the same-frequency full-duplex system, so that the capacity of the uplink and downlink services is the largest.

Description

Power control method and base station in same-frequency full-duplex system

technical field

The present application relates to the technical field of power control, in particular to a power control method and a base station in a same-frequency full-duplex system.

Background technique

In the time division duplex (TDD, Time Division Duplexing) system, such as my country's dominant communication system Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) and Time Division Long Term Evolution (TD-LTE, Time Division Long Term Evolution) divides a radio frame into 10 subframes, which are used as downlink subframes or uplink subframes. Match asymmetric uplink and downlink services by configuring different numbers of downlink subframes and uplink subframes.

With the rapid growth of mobile Internet traffic, the capacity and coverage problems of the TDD system, especially hot spots and indoor problems are becoming more and more prominent. First, a more flexible uplink and downlink subframe configuration mechanism needs to be designed to match the dynamic characteristics of service uplink and downlink. Second, it is necessary to further improve the spectrum efficiency of the TDD system to enhance network capacity. In this context, low-power high-density cells are introduced in the design of the new generation communication system, for example: a large number of pico base stations to improve the frequency reuse rate, while the same-frequency full-duplex transmission technology based on low-power base stations is getting better and better. Deeper and deeper attention.

The so-called full-duplex at the same frequency, the main idea is that the base station transmits downlink data and receives uplink data at the same time in the same time-frequency resource, so that the spectral efficiency can be doubled theoretically. The same-frequency full-duplex needs to configure the receiving antenna and the transmitting antenna separately at the base station, and the base station needs to eliminate the interference caused by the sending signal when receiving the uplink signal. At present, research institutions have achieved 73dB interference cancellation. If a directional antenna is used, it can even eliminate 113dB interference. In low-power base station application scenarios, for example: home base stations and pico base stations have achieved full-duplex transmission at the same frequency condition.

Since interference elimination requires high hardware requirements, it is not recommended to operate the same-frequency full-duplex transmission at the user end. In this way, the simplest and most effective method is that the base station simultaneously sends and receives two different user end data, as shown in Figure 1 The same-frequency full-duplex transmission scheme also improves the transmission efficiency of the entire system.

According to the same-frequency full-duplex transmission scheme shown in FIG. 1 , the base station sends data to user equipment (UE, User Equipment) 1 in the same subframe, and receives data sent by UE2 in the same subframe. In this way, the same-frequency full-duplex transmission also needs to solve the multi-user scheduling problem and the signaling transmission problem related to scheduling.

The existing same-frequency full-duplex transmission scheme has the following problems:

1. For two users transmitting in full-duplex at the same frequency as the base station, one sends uplink signals and the other receives downlink signals. In this way, the uplink signals will interfere with the downlink signals received by the other user. If the interference cannot be avoided or eliminated, then It will cause another user to fail to receive downlink data.

2. The existing multi-user scheduling mechanism cannot estimate the interference between two users, so it cannot realize full-duplex transmission on the same frequency.

Contents of the invention

The present application provides a power control method in a same-frequency full-duplex system, a base station, and a downlink UE, so as to reduce interference in the same-frequency full-duplex system.

A power control method in a same-frequency full-duplex system, the method comprising:

The base station broadcasts the transmission power and transmission mode of the uplink reference signal to each user equipment UE, so that: each uplink UE sends the uplink reference signal according to the transmission power and transmission mode of the uplink reference signal;

The base station receives the UE IDs of M uplink UEs with the least interference level to the downlink UE sent by any downlink UE, and according to the uplink path loss of each uplink UE, the path loss between each uplink UE and the downlink UE, the For the downlink path loss of the downlink UE, select the uplink UE paired with the downlink UE among the M uplink UEs, send the matched uplink transmit power to the uplink UE, and send services to the downlink UE according to the matched downlink transmit power,

The M is an integer greater than 1, and the M uplink UEs with the smallest interference level to the downlink UE are: when the downlink UE receives an uplink reference signal sent by any uplink UE, calculate the interference level, and select M uplink UEs with the smallest interference level among all uplink UEs.

The transmission mode of the uplink reference signal is:

The sequence numbers of the uplink reference signals sent by different uplink UEs are different, or different uplink UEs use different resources to send the uplink reference signals.

Selecting, by the base station, the uplink UE that best matches the downlink UE among the M uplink UEs includes:

Step A. For any uplink UE sent by the downlink UE, the base station calculates and satisfies inequality (1)-(4):

SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1)

Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2)

Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3)

SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4)

At the same time, make: the maximum capacity of uplink and downlink and Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the maximum value of Pw_dl_ui and Pw_ul_uj;

Among them, Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE;

Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE;

PL_ui is the downlink path loss of the downlink UE, which is measured by the downlink UE according to the downlink reference signal sent by the base station and sent to the base station, or obtained by the base station according to the uplink signal of the downlink UE;

PL_ui_uj is the path loss between the uplink UE and the downlink UE, which is measured by the downlink UE according to the uplink reference signal sent by the uplink UE and sent to the base station, and if the downlink UE does not send the PL_ui_uj value to the base station, it is considered Its value is 0;

PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the uplink reference signal;

Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users;

Th_1, Th_2, and Th_3 are the preset first threshold, the preset second threshold, and the preset third threshold, which are set according to the uplink service requirements of the uplink UE;

SINR_dl_ui is the signal-to-interference-plus-noise ratio SINR of the downlink UE;

SINR_ul_uj is the SINR of the uplink UE;

N0 is the preset noise power;

Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and use the corresponding Pw_dl_ui as the downlink UE assigned to the downlink UE by the base station For the transmit power, the corresponding Pw_ul_uj is used as the uplink transmit power allocated by the base station to the uplink UE.

The calculation of Pw_dl_ui and Pw_ul_uj satisfying the inequalities (1) to (4) further includes:

For any uplink UE, when Pw_dl_ui and Pw_ul_uj satisfying the inequalities (1)-(4) cannot be calculated, it is considered that the uplink UE cannot be paired with the downlink UE.

The method further includes: the base station broadcasts the total number of uplink UEs to each UE;

The downlink UE selecting M uplink UEs with the smallest interference level among all uplink UEs includes:

The downlink UE judges whether it has received the uplink reference signals sent by all uplink UEs according to the total number of uplink UEs, and if so, selects M uplink UEs with the smallest interference level according to the calculated interference level of each uplink UE to itself, and determines Send the UE IDs of the M uplink UEs and the path loss between the M uplink UEs and itself to the base station; otherwise, determine whether the number of uplink UEs that have not received the uplink reference signal sent by them is greater than or equal to M, if greater than or equal to M, select M arbitrarily among the uplink UEs that have not received the uplink reference signal sent by them, and determine to send the UE IDs of the M uplink UEs to the base station, if it is less than M, then determine to send the M-T interference level The UE ID of the smallest uplink UE, the path loss between the M-T uplink UEs and itself, and the UE IDs of all uplink UEs that have not received the uplink reference signal sent by them are sent to the base station, where T is the The number of uplink UEs that receive the uplink reference signal.

A base station in a same-frequency full-duplex system, comprising:

Transceiver module: broadcast the transmission power and transmission mode of the uplink reference signal to each UE, so that: each uplink UE sends the uplink reference signal according to the transmission power and transmission mode of the uplink reference signal;

Power control module: Receive the UE IDs of M uplink UEs with the least interference level to the downlink UE sent by any downlink UE, according to the uplink path loss of each uplink UE, the path between each uplink UE and the downlink UE loss, the downlink path loss of the downlink UE, select the uplink UE paired with the downlink UE among the M uplink UEs, send the matching uplink transmission power to the uplink UE, and send the matching downlink transmission power to the downlink UE For business, the M is an integer greater than 1, and the M uplink UEs with the least interference level to the downlink UE are: when the downlink UE receives an uplink reference signal sent by any uplink UE, calculate the to its own interference level, and select M uplink UEs with the smallest interference level among all uplink UEs. .

The power control module is further configured to perform the following steps when selecting an uplink UE that best matches the downlink UE among the M uplink UEs:

Step A. For any uplink UE sent by the downlink UE, the calculation satisfies inequality (1)-(4):

SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1)

Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2)

Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3)

SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4)

At the same time, make: the maximum capacity of uplink and downlink and Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the maximum value of Pw_dl_ui and Pw_ul_uj;

Among them, Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE;

Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE;

PL_ui is the downlink path loss of the downlink UE, which is measured by the downlink UE according to the downlink reference signal sent by the base station and sent to the base station, or obtained by the base station according to the uplink signal of the downlink UE;

PL_ui_uj is the path loss between the uplink UE and the downlink UE, which is measured by the downlink UE according to the uplink reference signal sent by the uplink UE and sent to the base station, and if the downlink UE does not send the PL_ui_uj value to the base station, it is considered Its value is 0;

PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the uplink reference signal;

Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users;

Th_1 and Th_2 are the preset first threshold and the preset second threshold, which are set according to the uplink service requirements of the uplink UE;

SINR_dl_ui is the signal-to-interference-plus-noise ratio SINR of the downlink UE;

SINR_ul_uj is the SINR of the uplink UE;

N0 is the preset noise power;

Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and use the corresponding Pw_dl_ui as the downlink UE assigned to the downlink UE by the base station For the transmit power, the corresponding Pw_ul_uj is used as the uplink transmit power allocated by the base station to the uplink UE.

The power control module is further configured to consider that the uplink UE cannot be paired with the downlink UE when Pw_dl_ui and Pw_ul_uj satisfying the inequalities (1)-(4) cannot be calculated.

A downlink UE in a same-frequency full-duplex system, comprising:

Measurement module: when receiving an uplink reference signal sent by any uplink UE, measure the interference level from the uplink UE to the downlink UE according to the uplink reference signal, and select M uplink UEs with the smallest interference level among all uplink UEs, Send the UE IDs of M uplink UEs with the smallest interference levels to the transmission module;

Transmission module: Send the UE IDs of the M uplink UEs with the smallest interference level sent by the measurement module to the base station, so that the base station selects the uplink UE paired with the current downlink UE among the M uplink UEs.

The measurement module is further used for receiving the total number of uplink UEs broadcast by the base station, and judging whether the uplink reference signals sent by all uplink UEs have been received according to the total number of uplink UEs, and if so, according to the calculated interference of each uplink UE to itself Level, select M uplink UEs with the smallest interference level, and send the UE IDs of the M uplink UEs to the transmission module; otherwise, judge whether the number of uplink UEs that have not received the uplink reference signal sent by them is greater than or equal to M, if If it is greater than or equal to M, select M arbitrarily among the uplink UEs that have not received the uplink reference signal sent by them, and send the UE IDs of the M uplink UEs to the transmission module. If it is less than M, then M-T interference level The UE ID of the smallest uplink UE and the UE IDs of all uplink UEs that have not received the uplink reference signal sent by it are sent to the transmission module, where T is the number of uplink UEs that have not received the uplink reference signal sent by it.

The measurement module is further configured to, when receiving an uplink reference signal sent by any uplink UE, measure the path loss between the uplink UE and the current downlink UE according to the uplink reference signal, and select M uplink UEs with the smallest interference level The path loss is sent to the transmission module;

The transmission module is further configured to send the path losses of the M uplink UEs with the smallest interference levels sent by the measurement module to the base station.

The measurement module is further configured to receive a downlink reference signal sent by the base station, measure its own downlink path loss according to the downlink reference signal, and send the downlink path loss to the transmission module;

The transmission module is further configured to send the downlink path loss of the downlink UE sent by the measurement module to the base station.

It can be seen from the above technical solutions that the present invention can reduce the interference between the uplink and downlink services in the same-frequency full-duplex system, so as to maximize the uplink and downlink service capacity.

Description of drawings

FIG. 1 is a schematic diagram of an existing same-frequency full-duplex transmission scheme;

FIG. 2 is a flowchart of a power control method in a same-frequency full-duplex system provided by an embodiment of the present invention;

FIG. 3 is a schematic composition diagram of a base station in a same-frequency full-duplex system provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of composition of a downlink UE provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The goal of the present invention is to adjust the uplink and downlink power of each resource so that the service transmission performance on the resource is the best, but considering:

1) The uplink power meets the needs of uplink services;

2) The downlink power meets the needs of downlink services;

3) Uplink power does not affect the reception of downlink users;

4) Downlink power does not affect the reception of uplink users.

Like this, the difficulty of the present invention is:

In order to meet the requirements of uplink services, the uplink transmission power must be large enough, but uplink users may cause unbearable interference to the downlink service reception of some downlink users;

In order to meet the requirements of downlink services, the downlink transmission power must be large enough, but limited by the interference suppression capability of the base station, too much downlink transmission power may cause unbearable interference to the service reception of the paired uplink users.

If the uplink service interferes too much with the downlink service, and the transmission power of the uplink user needs to be reduced, the uplink service may not be guaranteed;

If the uplink service interferes too much with the downlink service and the downlink transmission power needs to be increased, problems may arise in the detection of the uplink service at the base station side.

From the perspective of system performance, the transmission power of uplink and downlink should be as large as possible, and should be jointly optimized.

The optimization of uplink and downlink transmission power results in different pairs for different uplink and downlink users.

The power control of the full-duplex system should comprehensively consider: uplink transmission power, downlink transmission power, uplink and downlink user pairing, and scheduling algorithms.

Based on the above considerations, the following embodiments of the present invention are provided:

Fig. 2 is the flow chart of the power control method in the same-frequency full-duplex system provided by the embodiment of the present invention, as shown in Fig. 2, the specific steps are as follows:

Step 201: the base station sends a broadcast message to each UE, and the message carries the transmission power of the uplink reference signal, the transmission mode of the uplink reference signal, the total number of uplink UEs, and the transmission power of the downlink reference signal.

An uplink UE is a UE that sends an uplink service to a base station; a downlink UE is a UE that receives a downlink service delivered by a base station.

In this embodiment, the base station specifies that all uplink UEs use the same transmission power to send the uplink reference signal.

The uplink reference signal needs to distinguish different uplink UEs, which can be achieved in the following ways:

Mode 1: The sequence numbers of the uplink reference signals sent by different uplink UEs are different. Correspondingly, the transmission method of the uplink reference signal carried in the broadcast message in this step includes: the correspondence between each uplink UE identifier (ID) and the sequence number used when the UE sends the uplink reference signal.

Mode 2: Different uplink UEs use different resources to send uplink reference signals. Correspondingly, the way of sending the uplink reference signal carried in the broadcast message in this step includes: the correspondence between each uplink UE ID and the resource number used by the UE when sending the uplink reference signal.

Step 202: Each uplink UE receives the broadcast message, sends an uplink reference signal according to the transmission power of the uplink reference signal in the message and the transmission mode of the uplink reference signal, and each downlink UE receives the broadcast message, and records the information carried in the message The transmission power of the uplink reference signal, the total number of uplink UEs and the transmission power of the downlink reference signal; the base station sends the downlink reference signal to each downlink UE.

Step 203: For any downlink UE, when the downlink UE receives the uplink reference signal sent by any uplink UE, measure the received power of the uplink reference signal, according to the received power and the transmitted power of the uplink reference signal recorded by itself , calculate the interference level from the uplink UE to itself and the path loss between the uplink UE and the downlink UE, and record the corresponding relationship between the uplink UE ID and the interference level and the path loss; at the same time, when the downlink UE receives the When receiving a downlink reference signal, measure the received power of the downlink reference signal, and calculate its own downlink path loss according to the received power and the transmitted power of the downlink reference signal recorded by itself.

The uplink reference signal sent by the uplink UE will be received by the base station, and will also be received by the downlink UE with a closer distance.

Step 204: For any downlink UE, according to the total number of uplink UEs recorded by the downlink UE, judge whether it has received the uplink reference signals of all uplink UEs, if so, perform step 205; otherwise, perform step 206.

Step 205: The downlink UE selects M uplink UEs with the smallest interference level according to the interference levels recorded by itself from all uplink UEs to itself, and the UE IDs of the M uplink UEs, the path loss between the M uplink UEs and itself and send its own downlink path loss to the base station, and go to step 209.

M is a preset integer, M>1.

For the downlink UE, the smaller the interference level of an uplink UE is, the smaller the interference caused by the uplink UE to the downlink UE will be if the uplink UE and the downlink UE are paired to use the same resource.

If the interference levels of the M uplink UEs are all less than the preset threshold a, the downlink UE can also only send the UE IDs of the M uplink UEs to the base station without sending the path loss between each uplink UE and itself at the same time .

Step 206: The downlink UE judges whether the number T of uplink UEs that have not received the uplink reference signal is greater than M, if yes, execute step 207; otherwise, execute step 208.

Step 207: The downlink UE arbitrarily selects M out of the T uplink UEs, sends the UE IDs of the M uplink UEs and its own downlink path loss to the base station, and proceeds to step 209.

If the downlink UE does not receive the uplink reference signal sent by an uplink UE, it means that the distance between the downlink UE and the uplink UE is far enough, so that if the downlink UE and the uplink UE are paired to use the same resource, the mutual interference will be very small .

Step 208: The downlink UE sends the UE IDs of the T uplink UEs, the UE IDs of M-T uplink UEs with the smallest interference level, the path loss between the M-T uplink UEs and itself, and its own downlink path loss to the base station.

If the interference levels of the M-T uplink UEs with the smallest SINR are all less than the preset threshold a, then only the UE IDs of the M-T uplink UEs can be sent to the base station without sending the path loss between the M-T uplink UEs and itself at the same time .

Step 209: The base station receives the UE ID of each uplink UE and the downlink path loss of the downlink UE from any downlink UE, or the UE ID of each uplink UE, the path loss between each uplink UE and the downlink UE, and the downlink path loss of the downlink UE. The downlink path loss of the UE, for each uplink UE corresponding to the uplink UEID sent by the downlink UE, is calculated to satisfy the following inequalities (1) to (4):

SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1)

Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2)

Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3)

SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4)

At the same time, make: Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the largest Pw_dl_ui and Pw_ul_uj.

Among them, SINR_dl_ui is the signal to interference plus noise ratio (SINR, Signal toInterference plus Noise Ratio) of the downlink UE;

SINR_ul_uj is the SINR of the uplink UE;

Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE, and i is the user serial number;

Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE, and j is the user serial number;

PL_ui is the downlink path loss of the downlink UE;

PL_ui_uj is the path loss between the uplink UE and the downlink UE. When the downlink UE does not report the value of PL_ui_uj, it is considered to be 0;

PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the received power and transmission power of the uplink reference signal;

N0 is the noise power, which is a fixed value;

Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users;

Th_1, Th_2, and Th_3 are the preset first threshold, the preset second threshold, and the preset third threshold. According to different uplink services of different uplink UEs, the values of Th_1, Th_2, and Th_3 can be different for different uplink UEs .

If Pw_dl_ui and Pw_ul_uj satisfying the inequalities (1)-(4) simultaneously cannot be calculated, it is considered that the uplink UE cannot be paired with the downlink UE.

It should be noted that, for PL_ui, that is, the downlink path loss of the downlink UE, it may not be reported by the downlink UE to the base station, but directly calculated by the base station according to the uplink signal sent by the downlink UE.

Step 210: When the calculation is completed for each uplink UE, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and send the Pw_ul_uj of the uplink UE to the uplink UE, and the uplink UE uses the Pw_ul_uj to send services , and at the same time, the base station uses the Pw_dl_ui of the downlink UE to send services to the downlink UE.

FIG. 3 is a schematic diagram of the composition of the base station in the same-frequency full-duplex system provided by the embodiment of the present invention. As shown in FIG. 3 , it mainly includes: a transceiver module 31 and a power control module 32, wherein:

Transceiver module 31: broadcast to each UE the transmission power of the uplink reference signal, the transmission mode, the total number of uplink UEs, and the transmission power of the downlink reference signal; Receive power and transmit power, calculate and record the uplink path loss of the uplink UE.

Power control module 32: Receive the downlink path loss of the downlink UE from any downlink UE, UE IDs of M uplink UEs with the least interference level to the downlink UE, or, the downlink path loss of the downlink UE, M The UE ID of the uplink UE with the smallest interference level to the downlink UE, the path loss between the M uplink UEs and the downlink UE, according to the downlink path loss of the downlink UE, the path between the M uplink UEs and the downlink UE Loss, and the uplink path loss of each uplink UE recorded by the transceiver module 31, select the uplink UE paired with the downlink UE among the M uplink UEs, send the matching uplink transmit power to the uplink UE, and follow the matched downlink UE The transmit power transmits services to downlink UEs, and the M is an integer greater than 1.

The power control module 32 is further configured to perform the following steps when selecting an uplink UE that best matches the downlink UE among the M uplink UEs:

Step A. For any uplink UE sent by the downlink UE, calculate Pw_dl_ui and Pw_ul_uj that satisfy inequality (1)-(4):

Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1)

Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2)

Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3)

SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4)

At the same time, make: Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the largest Pw_dl_ui and Pw_ul_uj.

Among them, SINR_dl_ui is the SINR of the downlink UE;

SINR_ul_uj is the SINR of the uplink UE;

Pw_dl_ui is the downlink transmit power allocated by the base station to the downlink UE;

Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE;

PL_ui is the downlink path loss of the downlink UE;

PL_ui_uj is the path loss between the uplink UE and the downlink UE. When the downlink UE does not report the value of PL_ui_uj, it is considered to be 0;

PL_uj is the uplink path loss of the uplink UE;

Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users;

Th_1, Th_2, and Th_3 are the preset first threshold, the preset second threshold, and the preset third threshold, which are set according to the uplink service requirements of the uplink UE;

Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, use Pw_dl_ui as the downlink transmit power of the downlink UE, and set Pw_ul_uj as the uplink transmit power of the uplink UE.

The power control module 32 is further configured to consider that the uplink UE cannot be paired with the downlink UE when Pw_dl_ui and Pw_ul_uj satisfying the inequalities (1)-(4) cannot be calculated.

The composition of the uplink UE provided by the embodiment of the present invention is given below, which mainly includes: a first module, used to receive a broadcast message sent by the base station, the message carries the transmission power and transmission mode of the uplink reference signal, and according to the uplink reference signal send uplink reference signal according to the transmit power and transmission mode.

FIG. 4 is a schematic diagram of the composition of the downlink UE provided by the embodiment of the present invention. As shown in FIG. 4, it mainly includes: a measurement module 41 and a transmission module 42, wherein:

Measurement module 41: Receive the broadcast message sent by the base station, record the transmission power of the uplink reference signal carried by the message, the total number of uplink UEs and the transmission power of the downlink reference signal; when receiving the downlink reference signal sent by the base station, according to the downlink Refer to the received power and transmit power of the signal to calculate its own downlink path loss; when receiving an uplink reference signal sent by any uplink UE, calculate the uplink UE’s response to the current downlink UE according to the received power and transmit power of the uplink reference signal The interference level of the uplink UE and the path loss between the uplink UE and the downlink UE, select M uplink UEs with the smallest interference level among all the uplink UEs, and combine the UE IDs of the M uplink UEs with the smallest interference level and the M uplink UEs with the The path loss between the current downlink UEs and the downlink path loss of the current downlink UE are sent to the transmission module 42 .

Transmission module 42: Send the UEIDs of the M uplink UEs with the smallest interference level sent by the measurement module 41, the path loss between the M uplink UEs and the downlink UE, and the downlink path loss of the downlink UE to the base station, so as to: The base station selects an uplink UE to be paired with the current downlink UE among the M uplink UEs.

The measurement module 41 is further used to judge whether the uplink reference signals sent by all uplink UEs have been received according to the total number of uplink UEs sent by the base station, and if so, select M interference The uplink UE with the smallest level determines to send the UE IDs of the M uplink UEs and the path loss between the M uplink UEs and the downlink UE to the transmission module 42; otherwise, it is determined that the uplink reference signal sent by it is not received Whether the number of uplink UEs is greater than or equal to M, if it is greater than or equal to M, randomly select M among the uplink UEs that have not received the uplink reference signal sent by them, and determine to send the UE IDs of the M uplink UEs to the transmission module 42. If it is less than M, determine the UE IDs of the M-T uplink UEs with the smallest interference level, the path losses between the M-T uplink UEs and the current downlink UE, and the IDs of all uplink UEs that have not received the uplink reference signal sent by them. The UE ID is sent to the transmission module 42, where T is the number of uplink UEs that have not received the uplink reference signal sent by them.

Moreover, when the base station finds that the downlink UE has only sent the UE ID of one uplink UE but not the interference level of the uplink UE, it defaults that the path loss between the uplink UE and the downlink UE is 0.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. A power control method in a same-frequency full-duplex system, characterized in that, the method comprises: The base station broadcasts the transmission power and transmission mode of the uplink reference signal to each user equipment UE, so that: each uplink UE sends the uplink reference signal according to the transmission power and transmission mode of the uplink reference signal; The base station receives the UE IDs of M uplink UEs with the least interference level to the downlink UE sent by any downlink UE, and according to the uplink path loss of each uplink UE, the path loss between each uplink UE and the downlink UE, and the For the downlink path loss of the downlink UE, select the uplink UE paired with the downlink UE among the M uplink UEs, send the matched uplink transmit power to the uplink UE, and send services to the downlink UE according to the matched downlink transmit power, The M is an integer greater than 1, and the M uplink UEs with the smallest interference level to the downlink UE are: when the downlink UE receives an uplink reference signal sent by any uplink UE, calculate the interference level, and select M uplink UEs with the smallest interference level among all uplink UEs; Selecting, by the base station, the uplink UE that best matches the downlink UE among the M uplink UEs includes: Step A. For any uplink UE sent by the downlink UE, the base station calculates that it satisfies inequality (1)-(4): SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1) Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2) Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3) SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4) At the same time, make: the maximum capacity of uplink and downlink and Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the maximum value of Pw_dl_ui and Pw_ul_uj; Among them, Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE; Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE; PL_ui is the downlink path loss of the downlink UE, which is measured by the downlink UE according to the downlink reference signal sent by the base station and sent to the base station, or obtained by the base station according to the uplink signal of the downlink UE; PL_ui_uj is the path loss between the uplink UE and the downlink UE, which is measured by the downlink UE according to the uplink reference signal sent by the uplink UE and sent to the base station, and if the downlink UE does not send the PL_ui_uj value to the base station, it is considered Its value is 0; PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the uplink reference signal; Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users; Th_1, Th_2, and Th_3 are the preset first threshold, the preset second threshold, and the preset third threshold, which are set according to the uplink service requirements of the uplink UE; SINR_dl_ui is the signal-to-interference-plus-noise ratio SINR of the downlink UE; SINR_ul_uj is the SINR of the uplink UE; N0 is the preset noise power; Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and use the corresponding Pw_dl_ui as the downlink UE assigned to the downlink UE by the base station For the transmit power, the corresponding Pw_ul_uj is used as the uplink transmit power allocated by the base station to the uplink UE. 2. The method according to claim 1, wherein the transmission mode of the uplink reference signal is: The sequence numbers of the uplink reference signals sent by different uplink UEs are different, or different uplink UEs use different resources to send the uplink reference signals. 3. The method according to claim 1, wherein said calculating Pw_dl_ui and Pw_ul_uj satisfying inequality (1)～(4) further comprises: For any uplink UE, when Pw_dl_ui and Pw_ul_uj satisfying inequalities (1)-(4) cannot be calculated, it is considered that the uplink UE cannot be paired with the downlink UE. 4. The method according to claim 1, further comprising: the base station broadcasting the total number of uplink UEs to each UE; The downlink UE selecting M uplink UEs with the smallest interference level among all uplink UEs includes: The downlink UE judges whether it has received the uplink reference signals sent by all uplink UEs according to the total number of uplink UEs, and if so, selects M uplink UEs with the smallest interference level according to the calculated interference level of each uplink UE to itself, and determines Send the UE IDs of the M uplink UEs and the path loss between the M uplink UEs and itself to the base station; otherwise, determine whether the number of uplink UEs that have not received the uplink reference signal sent by them is greater than or equal to M, if greater than or equal to M, select M arbitrarily among the uplink UEs that have not received the uplink reference signal sent by them, and determine to send the UE IDs of the M uplink UEs to the base station, if it is less than M, then determine to send the M-T interference level The UE ID of the smallest uplink UE, the path loss between the M-T uplink UEs and itself, and the UE IDs of all uplink UEs that have not received the uplink reference signal sent by them are sent to the base station, where T is the The number of uplink UEs that receive the uplink reference signal. 5. A base station in a same-frequency full-duplex system, characterized in that, comprising: Transceiver module: broadcast the transmission power and transmission mode of the uplink reference signal to each UE, so that: each uplink UE sends the uplink reference signal according to the transmission power and transmission mode of the uplink reference signal; Power control module: Receive the UEIDs of M uplink UEs with the least interference level to the downlink UE from any downlink UE, according to the uplink path loss of each uplink UE, the path loss between each uplink UE and the downlink UE and the downlink path loss of the downlink UE, select the uplink UE paired with the downlink UE among the M uplink UEs, send the matched uplink transmit power to the uplink UE, and send services to the downlink UE according to the matched downlink transmit power , the M is an integer greater than 1, and the M uplink UEs with the smallest interference level to the downlink UE are: when the downlink UE receives an uplink reference signal sent by any uplink UE, calculate the uplink UE to own interference level, and select M uplink UEs with the smallest interference level among all uplink UEs; The power control module is further configured to perform the following steps when selecting an uplink UE that best matches the downlink UE among the M uplink UEs: Step A. For any uplink UE sent by the downlink UE, the calculation satisfies inequality (1)-(4): SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1) Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2) Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3) SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4) At the same time, make: the maximum capacity of uplink and downlink and Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the maximum value of Pw_dl_ui and Pw_ul_uj; Among them, Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE; Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE; PL_ui is the downlink path loss of the downlink UE, which is measured by the downlink UE according to the downlink reference signal sent by the base station and sent to the base station, or obtained by the base station according to the uplink signal of the downlink UE; PL_ui_uj is the path loss between the uplink UE and the downlink UE, which is measured by the downlink UE according to the uplink reference signal sent by the uplink UE and sent to the base station, and if the downlink UE does not send the PL_ui_uj value to the base station, it is considered Its value is 0; PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the uplink reference signal; Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users; Th_1 and Th_2 are the preset first threshold and the preset second threshold, which are set according to the uplink service requirements of the uplink UE; SINR_dl_ui is the signal-to-interference-plus-noise ratio SINR of the downlink UE; SINR_ul_uj is the SINR of the uplink UE; N0 is the preset noise power; Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and use the corresponding Pw_dl_ui as the downlink UE assigned to the downlink UE by the base station For the transmit power, the corresponding Pw_ul_uj is used as the uplink transmit power allocated by the base station to the uplink UE. 6. The base station according to claim 5, wherein the power control module is further configured to consider that the uplink UE cannot communicate with The downlink UE is paired. 7. A downlink UE in a same-frequency full-duplex system, characterized in that it comprises: Measurement module: when receiving an uplink reference signal sent by any uplink UE, measure the interference level from the uplink UE to the downlink UE according to the uplink reference signal, and select M uplink UEs with the smallest interference level among all uplink UEs, Send the UE IDs of M uplink UEs with the smallest interference levels to the transmission module; Transmission module: Send the UE IDs of the M uplink UEs with the smallest interference level sent by the measurement module to the base station, so that: the base station selects the uplink UE paired with the downlink UE among the M uplink UEs; Selecting, by the base station, an uplink UE paired with the present downlink UE among the M uplink UEs includes: Step A. For any uplink UE sent by the downlink UE, the base station calculates that it satisfies inequality (1)-(4): SINR_dl_ui=Pw_dl_ui-PL_ui-(Pw_ul_uj-PL_ui_uj)-N0>=Th_1 (1) Pw_dl_ui-(Pw_ul_uj-PL_uj)<=Th_2 (2) Pw_dl_ui<=Pmax_dl; Pw_ul_uj<=Pmax_ul (3) SINR_ul_uj=Pw_ul_uj-PL_uj-N0>=Th_3 (4) At the same time, make: the maximum capacity of uplink and downlink and Cul+Cdl=lg(1+SINR_dl_ui)+lg(1+SINR_ul_uj) the maximum value of Pw_dl_ui and Pw_ul_uj; Among them, Pw_dl_ui is the downlink transmission power allocated by the base station to the downlink UE; Pw_ul_uj is the uplink transmission power allocated by the base station to the uplink UE; PL_ui is the downlink path loss of the downlink UE, which is measured by the downlink UE according to the downlink reference signal sent by the base station and sent to the base station, or obtained by the base station according to the uplink signal of the downlink UE; PL_ui_uj is the path loss between the uplink UE and the downlink UE, which is measured by the downlink UE according to the uplink reference signal sent by the uplink UE and sent to the base station, and if the downlink UE does not send the PL_ui_uj value to the base station, it is considered Its value is 0; PL_uj is the uplink path loss of the uplink UE. When the base station receives the uplink reference signal sent by the uplink UE, it can calculate the uplink path loss of the uplink UE according to the uplink reference signal; Pmax_dl is the maximum downlink transmission power configured by the base station, and Pmax_ul is the maximum uplink transmission power configured by the base station. Pmax_dl and Pmax_ul do not distinguish between users, that is, their values are the same for all users; Th_1, Th_2, and Th_3 are the preset first threshold, the preset second threshold, and the preset third threshold, which are set according to the uplink service requirements of the uplink UE; SINR_dl_ui is the signal-to-interference-plus-noise ratio SINR of the downlink UE; SINR_ul_uj is the SINR of the uplink UE; N0 is the preset noise power; Step B. When the calculation of each uplink UE sent by the downlink UE is completed, select the uplink UE with the largest Cul+Cdl as the paired uplink UE of the downlink UE, and use the corresponding Pw_dl_ui as the downlink UE assigned to the downlink UE by the base station For the transmit power, the corresponding Pw_ul_uj is used as the uplink transmit power allocated by the base station to the uplink UE. 8. The downlink UE according to claim 7, wherein the measurement module is further used for receiving the total number of uplink UEs broadcast by the base station, and judging whether the uplink references sent by all uplink UEs have been received according to the total number of uplink UEs If yes, select M uplink UEs with the smallest interference level according to the calculated interference level of each uplink UE to itself, and send the UE IDs of the M uplink UEs to the transmission module; otherwise, it is judged that the transmission module has not received Whether the number of uplink UEs of the incoming uplink reference signal is greater than or equal to M, if it is greater than or equal to M, select M arbitrarily from the uplink UEs that have not received the uplink reference signal sent by them, and use the UE of the M uplink UEs Send the ID to the transmission module, if it is less than M, send the UE IDs of M-T uplink UEs with the smallest interference level and UE IDs of all uplink UEs that have not received the uplink reference signal sent by them to the transmission module, where T is The number of uplink UEs that have not received the uplink reference signal sent by them. 9. The downlink UE according to claim 7, wherein the measurement module is further configured to, when receiving an uplink reference signal sent by any uplink UE, measure the relationship between the uplink UE and the local terminal according to the uplink reference signal For the path loss between downlink UEs, send the path losses of M uplink UEs with the smallest interference level to the transmission module; The transmission module is further configured to send the path losses of the M uplink UEs with the smallest interference levels sent by the measurement module to the base station. 10. The downlink UE according to claim 7, wherein the measurement module is further configured to receive a downlink reference signal sent by the base station, measure its own downlink path loss according to the downlink reference signal, and determine the downlink path loss Send to the transmission module; The transmission module is further configured to send the downlink path loss of the downlink UE sent by the measurement module to the base station.