CN112383954A - Method and device for controlling power of simultaneous same-frequency full duplex system - Google Patents

Method and device for controlling power of simultaneous same-frequency full duplex system Download PDF

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CN112383954A
CN112383954A CN202011279371.XA CN202011279371A CN112383954A CN 112383954 A CN112383954 A CN 112383954A CN 202011279371 A CN202011279371 A CN 202011279371A CN 112383954 A CN112383954 A CN 112383954A
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user equipment
base station
power
power control
full duplex
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CN112383954B (en
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何宏
孙笑笑
李光远
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Dragon Totem Technology Hefei Co ltd
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Hangzhou Dianzi University
Hangzhou Dianzi University Shangyu Science and Engineering Research Institute Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

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Abstract

The invention discloses a method and a device for controlling the power of a simultaneous co-frequency full duplex system, and belongs to the technical field of 5G. The invention provides a simultaneous co-frequency full duplex system, a receiver demodulates uplink and downlink transmission signals, and the transmission power of a 5G base station and user equipment needs to meet the conditions; meanwhile, a method for controlling the power of a simultaneous co-frequency full duplex system is provided, and the minimum transmitting power of the 5G base station and the user equipment is ensured on the premise of meeting the service requirement and the demodulation performance. The invention ensures a full duplex system, and the base station and the user receiver can correctly demodulate data on the premise of meeting the service requirement, and simultaneously reduces the energy consumption of equipment and the interference. Moreover, the method of the invention is obviously different from the prior related technology and is easy to realize in engineering.

Description

Method and device for controlling power of simultaneous same-frequency full duplex system
Technical Field
The invention belongs to the technical field of 5G, and particularly relates to a system power control technology.
Background
With the increasing demand of people for high-speed multi-service, the mobile communication technology has gradually advanced from the 2G era mainly including voice service to the 5G era including higher-speed data service, and the frequency spectrum resource is more precious. Meanwhile, the same-Frequency full Duplex is an important technology of the 5G system, and compared with Time Division Duplex (TDD) and Frequency Division Duplex (FDD) technologies, the Frequency spectrum efficiency can be theoretically doubled, so that the same-Frequency full Duplex technology becomes a research hotspot at present.
Meanwhile, the same-frequency full duplex system receives and transmits information at the same time and frequency, which inevitably causes strong signal interference. In order to eliminate these interferences, according to different characteristics of the base station side and the terminal side, a self-Interference Cancellation technique is adopted on the base station side, and a Successive Interference Cancellation (SIC) technique is adopted on the terminal side.
However, for the simultaneous same-frequency full duplex system, how to perform power control to ensure that the receiver can correctly demodulate the transmitted data is urgently needed to be further studied.
In the current prior art, the related patents are mainly as follows:
1. the patent of application number CN201310065346.5 discloses a power control method and a base station in a co-frequency full duplex system, where the base station receives UE IDs of M uplink UEs with the minimum interference level to a downlink UE from any downlink UE, selects an uplink UE paired with the downlink UE from the M uplink UEs 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, sends matched uplink transmission power to the uplink UE, and sends a service to the downlink UE according to the matched downlink transmission power. The scheme focuses on selecting uplink UE paired with the downlink UE from M uplink UEs.
2. The invention discloses a cross-layer serial interference deleting method based on full-duplex communication in a heterogeneous network, which comprises the steps of acquiring full-duplex micro base station information, verifying the feasibility of serial interference deletion by a micro base station, calculating a weighted value of a transmitting signal by the micro base station, sending a weighted training signal to a micro user by the micro base station, judging the feasibility of fSICIC and feeding back adjustment information and weight, and adjusting the transmitting signal by the micro base station according to the received adjustment information and weight. The scheme focuses on that the proposed full-duplex based successive interference cancellation technique only needs to be done independently by each micro base station.
3. The patent of application No. CN201610209180.3 discloses a power control method and device, in which a user equipment performs transmit power compensation on subframes in different subframe sets by using different power compensation amounts, and transmits data on the subframes by using uplink transmit power compensated by the transmit power. The scheme focuses on ensuring the smooth signal-to-noise ratio of each uplink subframe when the full duplex technology is applied by a power compensation method.
Therefore, the related prior patents do not provide the power condition and the minimum transmit power that the base station and the user receiver can correctly demodulate the transmitted data in the simultaneous co-frequency full duplex system.
Disclosure of Invention
The present invention is directed to solve the problems of the prior art, and provides a method and an apparatus for controlling power of a simultaneous co-frequency full duplex system.
In order to achieve the purpose of the invention, the invention adopts the following specific technical scheme:
in a first aspect, the present invention provides a method for controlling power of a simultaneous co-frequency full duplex system, where a 5G base station in the simultaneous co-frequency full duplex system sends data to a first user equipment, and receives data sent by a second user equipment at the same frequency; the method comprises the following steps:
s1: the 5G base station measures the sounding reference symbol sent by the second user equipment to obtain a 5G baseInterference plus background noise power of a station
Figure BDA0002780224110000021
And a path loss value PL from the second user equipment to the 5G base station20；
S2: the first user equipment measures and obtains the power of the interference plus the background noise of the first user equipment in a channel state information reference signal sent by a 5G base station
Figure BDA0002780224110000022
And a path loss value PL from the 5G base station to the first user equipment01And reporting to the 5G base station through a physical uplink control channel;
s3: the first user equipment measures the path loss PL from the second user equipment to the first user equipment in the sounding reference symbol sent by the second user equipment21And reporting to the 5G base station through a physical uplink control channel;
s4: in each power control period, based on the measurement results of S1-S3, the maximum transmission power P of the 5G base station is combined0maxAnd maximum transmission power P of the second user equipment2maxAnd carrying out power control judgment, wherein:
if P2max-PL21>P0max-PL01Then the minimum transmission power allocated by the 5G base station to the first user equipment is determined
Figure BDA0002780224110000023
And P is0min≤P0max(ii) a Simultaneous determination of the minimum transmit power of a second user equipment
Figure BDA0002780224110000024
Figure BDA0002780224110000031
Figure BDA0002780224110000032
And P is2min≤P2max；
If P0max-PL01≥P2max-PL21Then determining the minimum transmission power of the second user equipment
Figure BDA0002780224110000033
Figure BDA0002780224110000034
And P is2min≤P2max(ii) a Simultaneously determining the minimum transmission power allocated by the 5G base station to the first user equipment
Figure BDA0002780224110000035
Figure BDA0002780224110000036
And P is0min≤P0max；
Wherein, delta01Demodulation threshold, delta, for the first subscriber device when demodulating 5G base station transmission signals20Demodulation threshold, delta, for a 5G base station demodulating a signal transmitted by a second user equipment21A demodulation threshold for the first user equipment when demodulating a signal sent by the second user equipment; delta is the transmission power headroom of the 5G base station allocated to the first user equipment, Delta′Max { A, B } represents taking the larger of A and B, which is the minimum transmit power headroom of the second user equipment;
s5: in each power control period, according to the power control decision result, the 5G base station adjusts the transmission power P distributed to the first user equipment0So that it is at a determined minimum power P0minSending; meanwhile, the 5G base station sends a power control command to the second user equipment through a physical downlink control channel to carry out uplink power control, and adjusts the sending power P of the second user equipment2So that it is at a determined minimum transmission power P2minAnd (5) sending.
In a second aspect, the present invention provides a power control apparatus for a simultaneous co-frequency full duplex system, where a 5G base station in the simultaneous co-frequency full duplex system transmits data to a first user equipment, and receives data transmitted by a second user equipment at the same frequency; the device includes:
a first measurement module for enabling the 5G base station to transmit at the second user equipmentIn the sounding reference symbol, the power of the interference plus the background noise of the 5G base station is measured and obtained
Figure BDA0002780224110000037
And a path loss value PL from the second user equipment to the 5G base station20；
A second measurement module, configured to enable the first user equipment to measure, in a channel state information reference signal sent by the 5G base station, power of the first user equipment for interference plus noise floor
Figure BDA0002780224110000038
And a path loss value PL from the 5G base station to the first user equipment01And reporting to the 5G base station through a physical uplink control channel;
a third measurement module, configured to enable the first user equipment to obtain, from the sounding reference symbol sent by the second user equipment, a path loss PL from the second user equipment to the first user equipment through measurement21And reporting to the 5G base station through a physical uplink control channel;
a power control decision module, configured to combine the maximum transmit power P of the 5G base station based on the measurement results of the first measurement module, the second measurement module, and the third measurement module in each power control period0maxAnd maximum transmission power P of the second user equipment2maxAnd carrying out power control judgment, wherein:
if P2max-PL21＞P0max-PL01Then the minimum transmission power allocated by the 5G base station to the first user equipment is determined
Figure BDA0002780224110000041
And P is0min≤P0max(ii) a Simultaneous determination of the minimum transmit power of a second user equipment
Figure BDA0002780224110000042
Figure BDA0002780224110000043
Figure BDA0002780224110000044
And P is2min≤P2max；
If P0max-PL01≥P2max-PL21Then determining the minimum transmission power of the second user equipment
Figure BDA0002780224110000049
Figure BDA0002780224110000046
And P is2min≤P2max(ii) a Simultaneously determining the minimum transmission power allocated by the 5G base station to the first user equipment
Figure BDA0002780224110000047
Figure BDA0002780224110000048
And P is0min≤P0max；
Wherein, delta01Demodulation threshold, delta, for the first subscriber device when demodulating 5G base station transmission signals20Demodulation threshold, delta, for a 5G base station demodulating a signal transmitted by a second user equipment21A demodulation threshold for the first user equipment when demodulating a signal sent by the second user equipment; Δ is the transmission power margin allocated to the first user equipment by the 5G base station, Δ' is the minimum transmission power margin of the second user equipment, and max { A, B } represents the larger value of A and B;
and a power control execution module, configured to, in each power control period, adjust, by the 5G base station, the transmission power P allocated to the first user equipment according to the power control decision result0So that it is at a determined minimum power P0minSending; meanwhile, the 5G base station sends a power control command to the second user equipment through a physical downlink control channel to carry out uplink power control, and adjusts the sending power P of the second user equipment2So that it is at a determined minimum transmission power P2minAnd (5) sending.
Compared with the prior art, the invention has the following beneficial effects:
the method for controlling the power of the simultaneous co-frequency full duplex system ensures the full duplex system, and the base station and the user receiver can correctly demodulate data on the premise of meeting the service requirement, and simultaneously reduces the energy consumption of equipment and the interference. Moreover, the method of the invention is obviously different from the prior related technology and is easy to realize in engineering.
Drawings
FIG. 1 is a schematic diagram of a simultaneous co-frequency full duplex system;
FIG. 2 is a diagram illustrating data transceiving at a base station side;
FIG. 3 is a block diagram of a SIC receiver;
fig. 4 is a flow chart of power control for a simultaneous co-frequency full duplex system.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
As shown in fig. 1, the simultaneous co-frequency full duplex system includes a 5G base station (gnnodeb, gNB) and a User Equipment (UE), and for convenience of description, a first User Equipment is denoted as UE1, and a second User Equipment is denoted as UE 2. The gNB transmits data to UE1 while receiving data transmitted by UE2 on the same frequency. Therefore, the gNB transmit signal will generate self-interference to the receive signal; at the same time, the received signal of UE1 may also be interfered by the transmitted signal of UE 2.
Signal y received by up base station side0Is composed of
y0＝h00x0+h20x2+n0 (1)
Wherein h is00Is the fading coefficient of the gNB channel from the sending end to the receiving end, h20For the UE2 to gNB receiving end channel fading coefficient, n0For gNB background noise and other interference, x0For gNB signaling, x2Signaling UE 2.
The base station side detects and obtains x by adopting a self-interference elimination method2As shown in fig. 2, the base station transmits a Demodulation reference signal (Demodulation reference) via the gNB and the UE2nce Signal, DMRS) channel estimation to obtain channel fading coefficient h00And h20And simultaneously, the receiving end informs a self-interference signal x through the sending end0Namely, the self-interference signal is eliminated at the receiving end to obtain the received signal y 'with the self-interference eliminated'0Comprises the following steps:
y′0＝h20x2+n0 (2)
in order to transmit a signal x from equation (2)2Demodulated out and needs to satisfy
Figure BDA0002780224110000051
Wherein, in the formula, P2Signalling x for UE22Power of (PL)20For the UE2 to gNB path loss value,
Figure BDA0002780224110000052
power of other interference and noise floor for gNB, where Iother0Other interference power representative of the gbb's,
Figure BDA0002780224110000053
representing the noise floor power, δ, of gNB20Demodulating Signal x for gNB2The demodulation threshold of time.
A downlink user side adopts a SIC receiver to demodulate data, as shown in FIG. 3, the SIC receiver arranges signals according to the power from large to small, firstly demodulates the signal with large power, and takes other signals as interference; the demodulated signal is then reconstructed and removed from the received signal, which in turn demodulates the other signals.
Signal y received by UE11Comprises the following steps:
y1＝h01x0+h21x2+n1 (4)
wherein h is01Is the gNB to UE1 channel fading coefficient, h21For UE2 to UE1 channel fading coefficients, n1For UE1 receiver background noise and interference, x0For gNB signaling, x2Signaling UE 2.
1) If P2-PL21＞P0-PL01Then the SIC receiver of UE1 demodulates the received interference signal x of UE2 first2Then demodulates gNB signal x0。
In order to interfere with signal x2Demodulated out and needs to satisfy
Figure BDA0002780224110000061
Wherein, P2Signalling x for UE22Power of (PL)21Is the path loss value, P, from UE2 to UE10Signal x for gNB0Power of (PL)01For the value of the path loss from the gNB to the UE1,
Figure BDA0002780224110000062
power values for other interference and noise floor for the UE1 receiver, where Iother1Other interference power on behalf of the UE1,
Figure BDA0002780224110000063
representing the background noise power, δ, of the UE121Demodulating Signal x for UE1 receiver2The demodulation threshold of time.
The UE1 can obtain h through the DMRS channel estimation sent by the gNB and the UE201And h21The demodulated interference signal x2Substituting into equation (4), and eliminating, can yield:
y′1＝h01x0+n1 (6)
also for demodulating gNB signal x0Need to satisfy
Figure BDA0002780224110000064
Wherein, delta01Demodulating Signal x for UE1 receiver0The demodulation threshold and other parameters have the same meanings as the formula.
2) If P0-PL01＞P2-PL21Then the SIC receiver first demodulates the received gNB signal x0The following requirements are met:
Figure BDA0002780224110000065
in the formula, the meaning of the parameters is the same as that of the above formula.
In summary, in order to demodulate the uplink and downlink transmission signals, the receiver of the simultaneous co-frequency full duplex system needs to satisfy the following conditions:
if P2max-PL21＞P0max-PL01Then, the following conditions are satisfied:
Figure BDA0002780224110000066
wherein, P2maxFor the UE2 maximum transmit power, P0maxIs the maximum transmit power of the gbb. The other parameters in the formula have the same meanings as the former formula.
If P0max-PL01≥P2max-PL21Then, the following conditions are satisfied:
Figure BDA0002780224110000071
in the formula, the meaning of the parameters is the same as that of the above formula.
Thus, based on the foregoing theory, a flow chart of the power control of the simultaneous co-frequency full duplex system is shown in fig. 4.
Next, the foregoing control procedure will be described. In a preferred implementation manner of the present invention, a method for controlling power of a simultaneous co-frequency full duplex system is provided, and referring to fig. 1, in the simultaneous co-frequency full duplex system, a 5G base station transmits data to a first user equipment, and simultaneously receives data transmitted by a second user equipment on the same frequency. A5G base station (gNB) in a simultaneous co-frequency full duplex system transmits data to a first user equipment (UE1) and receives data transmitted by a second user equipment (UE2) on the same frequency. The power control method comprises the following specific steps:
s1: the gNB measures, in a Sounding Reference Symbol (SRS) sent by the UE2, the interference plus background noise power of the gNB
Figure BDA0002780224110000072
And path loss value PL of UE2 to gNB20。
S2: the UE1 measures the power of the interference-plus-background noise of the UE1 in a Channel State Information Reference Signal (CSI-RS) sent by the gNB
Figure BDA0002780224110000073
And gNB to UE1 path loss value PL01And reporting the gNB through a Physical Uplink Control Channel (PUCCH).
S3: UE1 measures path loss PL from UE2 to UE1 in SRS transmitted by UE221And reports the gNB through a physical uplink control channel.
S4: in each power control period, based on the measurement results of S1-S3, the maximum transmission power P of the 5G base station is combined0maxAnd maximum transmission power P of the second user equipment2maxAnd carrying out power control judgment. When power control judgment is carried out, the related measurement value is obtained according to the measurement module in the last step, and the sending signal power P from the gNB to the UE1 is calculated through the formula (9) or the formula (10)0And UE2 transmit signal power P2A minimum value. In the same-frequency full duplex system, each device adjusts power according to a certain power control period, so that when the next power control period arrives, the power P is sent according to the current gNB0And UE2 transmit power P2And the path loss value PL obtained by the measuring module21And PL01And judging to obtain the minimum transmission power of the gNB and the UE2 which meet the condition of simultaneous same-frequency full duplex, and adjusting the transmission power of the gNB and the UE2 to the minimum transmission power value.
Therefore, as described above, the calculation of the minimum transmission power value is performed according to the formula (9) or the formula (10), and it is necessary to select the minimum transmission power value according to the different cases 1) or 2), where:
1) if P2max-PL21＞P0max-PL01Should be calculated according to equation (9) and converted to dB value, then:
the minimum transmit power allocated by the gNB to the UE1 is determined to be:
Figure BDA0002780224110000081
and P is0min≤P0max；
Meanwhile, the minimum transmit power of the UE2 is determined to be:
Figure BDA0002780224110000082
Figure BDA0002780224110000083
and P is2min≤P2max；
2) If P0max-PL01≥P2max-PL21If the calculation is carried out according to the formula (10), then:
the minimum transmit power of the UE2 is determined to be:
Figure BDA0002780224110000084
and P is2min≤P2max；
Meanwhile, the minimum transmit power allocated by the gNB to the UE1 is determined to be:
Figure BDA0002780224110000085
and P is0min≤P0max；
Wherein, delta01For the demodulation threshold, δ, at which the UE1 demodulates the gNB transmitted signal20For demodulation threshold, δ, when the gNB demodulates signals sent by UE221A demodulation threshold for UE1 when demodulating UE2 transmitted signals; Δ is the transmit power headroom allocated by gNB to UE1, Δ' is the minimum transmit power headroom of UE2, and max { A, B } represents the larger of A and B. Wherein the demodulation thresholdδ20，δ21，δ01It can be configured by higher layer parameters according to the service requirements and demodulation capabilities of the gbb and the UE. The transmit power margins Δ and Δ' may also be configured by higher layer parameters.
S5: in each power control period, according to the power control decision result, the gNB adjusts the transmission power P allocated to the UE10So that it is at a determined minimum power P0minSending; meanwhile, the gNB sends a Power Control command (TPC) to the UE2 through a Physical Downlink Control Channel (PDCCH) to perform uplink Power Control, and adjusts the transmission Power P of the UE22So that it is at a determined minimum transmission power P2minAnd (5) sending.
The power control decision at S4 and the power adjustment at S5 may be performed when each power control period arrives, so as to transmit data at the minimum transmission power in the power control period, thereby saving energy consumption of the device and reducing interference.
Example 1
Assuming a signal bandwidth of 20MHz, a gNB maximum transmit power of 46dBm, and a UE maximum transmit power of 23 dBm.
The first step is as follows: firstly, a relevant measured value is obtained through a measuring module.
Suppose that: the gNB measures the SRS sent by the UE2
Figure BDA0002780224110000086
And path loss value PL of UE2 to gNB20107 dB; the UE1 obtains the measurement through the CSI _ RS sent by the gNB
Figure BDA0002780224110000091
And gNB to UE1 path loss value PL01126 dB; reporting the gNB through PUUCH; the UE1 can obtain the path loss PL from the UE2 to the UE1 by measuring the SRS transmitted by the UE22192dB and reports gbb via PUUCH.
According to the service requirement and the demodulation capability of the gNB and the UE, the demodulation threshold delta is configured by the high-level parameters20＝6dB，δ21＝12dB，δ01＝10dB。
The second step is that: according to the last step of measurementThe module obtains the relevant measured value due to P2max-PL21＞P0max-PL01The gNB-to-UE 1 transmission signal power P is calculated by the equation (9)0And UE2 transmit signal power P2A minimum value.
Assuming that the higher layer configuration gNB allocates the UE1 with a transmission power margin Δ of 3dB and the UE2 with a minimum transmission power margin Δ' of 2dB, it is determined that:
minimum transmit power allocated by the gNB to the UE1
Figure BDA0002780224110000092
Figure BDA0002780224110000093
Minimum transmit power of UE2
Figure BDA0002780224110000094
Figure BDA0002780224110000095
Similarly, the demodulation threshold δ is configured by the higher layer parameters according to the service requirement and the demodulation capability of the gNB and the UE20＝6dB，δ21＝12dB，δ01＝10dB。
The third step: and re-adjusting the power according to the power distribution algorithm. When the power control period is reached, according to the power control decision result of the previous step, the gNB adjusts the transmission power P distributed to the UE10To make it at a minimum power P0minThe value 41dBm is transmitted.
Transmit power P for UE22The gNB transmits a Power Control (TPC) command through a Physical Downlink Control Channel (PDCCH), performs uplink Power Control, and changes the transmission Power P of the UE22To make it at a minimum transmission power P2minThe value 21dBm is transmitted.
Example 2
Assuming a signal bandwidth of 20MHz, a gNB maximum transmit power of 46dBm, and a UE maximum transmit power of 23 dBm.
The first step is as follows: firstly, a relevant measured value is obtained through a measuring module.
Suppose that: the gNB measures the SRS sent by the UE2
Figure BDA0002780224110000096
And path loss value PL of UE2 to gNB20108 dB; the UE1 obtains the measurement through the CSI _ RS sent by the gNB
Figure BDA0002780224110000101
And gNB to UE1 path loss value PL01120 dB; reporting the gNB through PUUCH; the UE1 can obtain the path loss PL from the UE2 to the UE1 by measuring the SRS transmitted by the UE221125dB and reports gbb via PUUCH.
According to the service requirement and the demodulation capability of the gNB and the UE, the demodulation threshold delta is configured by the high-level parameters20＝6dB，δ21＝12dB，δ01＝10dB
The second step is that: obtaining the relevant measured value according to the last step of the measuring module, since P0max-PL01≥P2max-PL21The gNB-to-UE 1 transmission signal power P is calculated by the equation (10)0And UE2 transmit signal power P2A minimum value.
Assuming that the higher layer configuration gNB allocates the UE1 with a transmission power margin Δ of 3dB and the UE2 with a minimum transmission power margin Δ' of 2dB, it is determined that:
minimum transmit power of UE2
Figure BDA0002780224110000102
Figure BDA0002780224110000103
Minimum transmit power allocated by the gNB to the UE1
Figure BDA0002780224110000104
Figure BDA0002780224110000105
Similarly, depending on traffic demand and solution of gNB and UETuning capability, demodulation threshold delta being configured by higher-level parameters20＝6dB，δ21＝12dB，δ01＝10dB
The third step: and re-adjusting the power according to the power distribution algorithm. Upon arrival of the power control period, the gNB adjusts the transmit power P allocated to the UE10To make it at a minimum power P0minThe value 33.8dBm is transmitted.
Transmit power P for UE22The gNB transmits a Power Control (TPC) command through a Physical Downlink Control Channel (PDCCH), performs uplink Power Control, and changes the transmission Power P of the UE22To make it at a minimum transmission power P2minThe value 18dBm is transmitted.
Therefore, the invention provides a simultaneous co-frequency full duplex system, and the receiver needs to meet the conditions of gNB and UE transmission power in order to demodulate the uplink and downlink transmission signals; meanwhile, a method for controlling the power of a simultaneous co-frequency full duplex system is provided, and the minimum transmitting power of the gNB and the UE is ensured on the premise of meeting the service requirement and the demodulation performance.
In addition, the present invention can further provide a device for controlling power of a simultaneous co-frequency full duplex system, which corresponds to the above method for controlling a simultaneous co-frequency full duplex system one to one, and comprises a measurement module (a first measurement module, a second measurement module, and a third measurement module, respectively), a power decision module, and a power control execution module. The specific functions of each module are as follows: a first measurement module to implement S1; a second measurement module to implement S2; a third measurement module to implement S3; a power decision module for implementing S4; and the power control execution module is used for realizing S5.
In addition, those skilled in the art should understand that the modules and functions related to the present invention can be implemented by circuits, other hardware, or executable program codes as long as the corresponding functions can be implemented. If code is employed, the code may be stored in a storage device and executed by a corresponding element in a computing device. Implementations of the invention are not limited to any specific combination of hardware and software. The hardware models in the invention can adopt products sold in the market, and can be selected according to the actual user requirements. Of course, the above-mentioned devices may be matched with other necessary hardware, software and systems if necessary, and those skilled in the art may design the devices according to the actual situation, and will not be described herein again.
In addition, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.

Claims (10)

1. A power control method of a simultaneous same-frequency full duplex system is disclosed, wherein a 5G base station in the simultaneous same-frequency full duplex system transmits data to a first user equipment and receives data transmitted by a second user equipment on the same frequency; the method is characterized by comprising the following steps:
s1: the 5G base station measures the power of the interference plus the background noise of the 5G base station in the sounding reference symbol sent by the second user equipment
Figure FDA0002780224100000011
And a path loss value PL from the second user equipment to the 5G base station20；
S2: the first user equipment measures and obtains the power of the interference plus the background noise of the first user equipment in a channel state information reference signal sent by a 5G base station
Figure FDA0002780224100000012
And a path loss value PL from the 5G base station to the first user equipment01And reporting to the 5G base station through a physical uplink control channel;
s3: sounding reference sent by first user equipment at second user equipmentIn the reference symbols, the path loss PL from the second user equipment to the first user equipment is measured21And reporting to the 5G base station through a physical uplink control channel;
s4: in each power control period, based on the measurement results of S1-S3, the maximum transmission power P of the 5G base station is calculated0maxAnd maximum transmission power P of the second user equipment2maxAnd carrying out power control judgment, wherein:
if P2max-PL21＞P0max-PL01Then the minimum transmission power allocated by the 5G base station to the first user equipment is determined
Figure FDA0002780224100000013
And P is0min≤P0max(ii) a Simultaneous determination of the minimum transmit power of a second user equipment
Figure FDA0002780224100000014
Figure FDA0002780224100000015
Figure FDA0002780224100000016
And P is2min≤P2max；
If P0max-PL01≥P2max-PL21Then determining the minimum transmission power of the second user equipment
Figure FDA0002780224100000017
Figure FDA0002780224100000018
And P is2min≤P2max(ii) a Simultaneously determining the minimum transmission power allocated by the 5G base station to the first user equipment
Figure FDA0002780224100000019
Figure FDA00027802241000000110
And P is0min≤P0max；
Wherein, delta01Demodulation threshold, delta, for the first subscriber device when demodulating 5G base station transmission signals20Demodulation threshold, delta, for a 5G base station demodulating a signal transmitted by a second user equipment21A demodulation threshold for the first user equipment when demodulating a signal sent by the second user equipment; Δ is the transmission power margin allocated to the first user equipment by the 5G base station, Δ' is the minimum transmission power margin of the second user equipment, and max { A, B } represents the larger value of A and B;
s5: in each power control period, according to the power control decision result, the 5G base station adjusts the transmission power P distributed to the first user equipment0So that it is at a determined minimum power P0minSending; meanwhile, the 5G base station sends a power control command to the second user equipment through a physical downlink control channel to carry out uplink power control, and adjusts the sending power P of the second user equipment2So that it is at a determined minimum transmission power P2minAnd (5) sending.
2. The method of claim 1, wherein the power control decision and power adjustment are performed at the arrival of each power control period.
3. The simultaneous same-frequency full duplex system power control method as in claim 1, wherein the demodulation threshold δ20、δ21、δ01Configured by higher layer parameters.
4. The simultaneous same-frequency full duplex system power control method of claim 1, wherein the transmit power headroom Δ and Δ' is configured by higher layer parameters.
5. The power control method of the simultaneous co-frequency full duplex system according to claim 1, wherein the first user equipment at the downlink user side employs a SIC receiver for data demodulation.
6. A kind of power control device of the co-time co-frequency full duplex system, the 5G base station in the said co-time co-frequency full duplex system sends the data to the first user equipment, receive the data that the second user equipment sends on the same frequency at the same time; it is characterized by comprising:
a first measurement module, configured to enable the 5G base station to measure, in the sounding reference symbol sent by the second user equipment, power of the 5G base station for interference plus noise floor
Figure FDA0002780224100000021
And a path loss value PL from the second user equipment to the 5G base station20；
A second measurement module, configured to enable the first user equipment to measure, in a channel state information reference signal sent by the 5G base station, power of the first user equipment for interference plus noise floor
Figure FDA0002780224100000022
And a path loss value PL from the 5G base station to the first user equipment01And reporting to the 5G base station through a physical uplink control channel;
a third measurement module, configured to enable the first user equipment to obtain, from the sounding reference symbol sent by the second user equipment, a path loss PL from the second user equipment to the first user equipment through measurement21And reporting to the 5G base station through a physical uplink control channel;
a power control decision module, configured to combine the maximum transmit power P of the 5G base station based on the measurement results of the first measurement module, the second measurement module, and the third measurement module in each power control period0maxAnd maximum transmission power P of the second user equipment2maxAnd carrying out power control judgment, wherein:
if P2max-PL21＞P0max-PL01Then the minimum transmission power allocated by the 5G base station to the first user equipment is determined
Figure FDA0002780224100000023
And P is0min≤P0max(ii) a Determining the minimum transmission power P of the second user equipment at the same time2min＝max
Figure FDA0002780224100000031
Figure FDA0002780224100000032
And P is2min≤P2max；
If P0max-PL01≥P2max-PL21Then determining the minimum transmission power of the second user equipment
Figure FDA0002780224100000033
Figure FDA0002780224100000034
And P is2min≤P2max(ii) a Simultaneously determining the minimum transmission power allocated by the 5G base station to the first user equipment
Figure FDA0002780224100000035
Figure FDA0002780224100000036
And P is0min≤P0max；
Wherein, delta01Demodulation threshold, delta, for the first subscriber device when demodulating 5G base station transmission signals20Demodulation threshold, delta, for a 5G base station demodulating a signal transmitted by a second user equipment21A demodulation threshold for the first user equipment when demodulating a signal sent by the second user equipment; Δ is the transmission power margin allocated to the first user equipment by the 5G base station, Δ' is the minimum transmission power margin of the second user equipment, and max { A, B } represents the larger value of A and B;
and a power control execution module, configured to, in each power control period, adjust, by the 5G base station, the transmission power P allocated to the first user equipment according to the power control decision result0So that it is at a determined minimum power P0minSending; at the same time, the 5G base station controls through physical downlinkThe channel sends a power control command to the second user equipment to perform uplink power control, and the sending power P of the second user equipment is adjusted2So that it is at a determined minimum transmission power P2minAnd (5) sending.
7. The apparatus of claim 6, wherein the power control decision and power adjustment are performed at the arrival of each power control period.
8. The simultaneous same-frequency full duplex system power control apparatus as in claim 6, wherein the demodulation threshold δ20、δ21、δ01Configured by higher layer parameters.
9. The simultaneous same-frequency full duplex system power control apparatus of claim 6, wherein the transmit power headroom Δ and Δ' is configured by higher layer parameters.
10. The apparatus for power control of a simultaneous co-frequency full duplex system according to claim 6, wherein the first user equipment at the downlink user side employs a SIC receiver for data demodulation.
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