CN110149128B - Power adjustment method and device in MIMO-NOMA system - Google Patents

Power adjustment method and device in MIMO-NOMA system Download PDF

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CN110149128B
CN110149128B CN201910383035.0A CN201910383035A CN110149128B CN 110149128 B CN110149128 B CN 110149128B CN 201910383035 A CN201910383035 A CN 201910383035A CN 110149128 B CN110149128 B CN 110149128B
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power
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base station
power control
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CN110149128A (en
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徐顺清
石晶林
张宗帅
龙隆
李光远
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Institute of Computing Technology of CAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

Abstract

The invention provides a power adjusting method in a MIMO-NOMA system. The method comprises the following steps: determining the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver; calculating the uplink signal-to-noise ratio of each user according to the uplink reference signal power and the path loss of each user; and configuring a power control instruction of each user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of each user, and sending the power control instruction to the corresponding user, so that the user can adjust the transmitting power of the user according to the power control instruction. The invention can demodulate the user signal from the base station receiver, and improve the spectrum efficiency of the system and the access capacity of the system.

Description

Power adjustment method and device in MIMO-NOMA system
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a power adjustment method and device in a MIMO-NOMA system.
Background
Along with the popularization and application of the intelligent terminal and the continuous increase of the new mobile service demand, the demand of wireless transmission rate increases exponentially, and a wider application prospect is provided for 5G. Compared with 4G, 5G can greatly improve the spectrum efficiency, the transmission rate and the system capacity, and realize the sustainable development of the mobile communication network.
The advent of each generation of mobile communication systems has been accompanied by innovations in multiple access technologies. NOMA (non-orthogonal multiple access technology) changes the power domain from exclusive use by a single user to sharing by multiple users, thereby greatly improving the frequency spectrum efficiency, and thus NOMA becomes one of the key technologies in 5G; MIMO (Multiple-Input Multiple-Output) technology has been widely applied in 4G, and MIMO realizes Multiple transmission and Multiple reception through Multiple antennas, thereby fully utilizing spatial resources, and improving spectral efficiency, system capacity and transmission reliability.
Therefore, in order to further improve the spectrum efficiency of the communication system, currently, NOMA and MIMO are combined to become one of the hot techniques in the 5G research field. In the MIMO-NOMA system, a communication device is equipped with multiple antennas, and users also include multiple groups, so how to solve the power control of different users for transmitting data in uplink and receiving data in downlink is one of the key problems in the MIMO-NOMA system. The power control is based on the evaluation of the received signal strength, signal-to-noise ratio and other indexes of the receiving end, and timely changes the transmitting power to compensate the path loss and fading in the wireless channel, thereby reducing the transmitting power to the minimum extent on the premise of ensuring the communication quality of the user, not generating interference to other users in wireless resources, and increasing the system capacity.
However, the existing power adjustment method in the MIMO-NOMA system is mainly to theoretically calculate the power allocated to each user according to the current channel condition by using a preset formula or a mathematical method such as graph theory, and the power adjustment method is simple, but is difficult to apply in actual engineering development, and when the estimation of the uplink and downlink channels is not accurate, the power adjustment method has a large error, and may cause the receiver not to correctly demodulate the signal of the corresponding user.
Disclosure of Invention
Therefore, an object of the present invention is to overcome the above-mentioned drawbacks of the prior art and to provide a method and an apparatus for power adjustment in a MIMO-NOMA system.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the present invention provides a method for adjusting power in a MIMO-NOMA system, including:
determining the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver;
calculating the uplink signal-to-noise ratio of each user according to the uplink reference signal power and the path loss of each user;
and configuring a power control instruction of each user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of each user, and sending the power control instruction to the corresponding user, so that the user can adjust the transmitting power of the user according to the power control instruction.
In the method, determining the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver comprises the following steps:
the actual transmitting power of the first user is larger than the sum of the actual transmitting power of the other users and the demodulation threshold of the base station receiver, and the actual transmitting power is the difference between the initial transmitting power of each user and the corresponding path loss.
In the above method, determining the power control command of each user according to the multiple uplink snrs and the initial transmit power of each user includes:
and determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to the NP criterion, and if so, configuring a power control instruction of each user according to the initial transmitting power.
In the above method, each RE multiplexes a first user and a second user;
correspondingly, determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to an NP criterion, and if so, configuring a power control instruction of each user according to initial transmitting power, wherein the power control instruction comprises the following steps:
when P'rx1＞P′rx2If so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is kept unchanged; p'rx1Is the signal strength, P 'of the first user received by the base station'rx2Signal strength of the second user received for the base station;
when P'rx1＞P′rx2And if so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is decreased by a third preset value.
Or when P'rx1＞P′rx2And if so, configuring a power control instruction for increasing the initial transmission power of the first user and the second user by a second preset value at the same time.
In the above method, before determining the power control command of each user according to the uplink signal-to-noise ratio and the initial transmit power of each user, the method further includes:
and judging whether the current time slot is in a power regulation period, if so, executing a step of configuring a power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user.
In another aspect, the present invention provides a power adjustment apparatus in a MIMO-NOMA system, including:
a determining module, configured to determine an initial transmit power of each user according to the path loss of each user and a demodulation threshold of the base station receiver;
the calculation module is used for calculating the uplink signal-to-noise ratio of each user according to the uplink reference signal power and the path loss of each user;
and the configuration module is used for configuring the power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user, sending the power control instruction to the corresponding user and enabling the user to adjust the transmitting power of the user according to the power control instruction.
Wherein the configuration module comprises:
a determining unit, configured to determine whether the uplink snr of each user meets a specified condition according to an NP criterion, and if so, trigger the configuration unit;
and the configuration unit is used for configuring the power control instruction of each user according to the initial transmitting power.
In yet another aspect, the present invention provides an electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the executable instructions, when executed by the processor, cause the processor to perform the method of power scaling in a MIMO-NOMA system as described above.
In yet another aspect, the present invention provides a computer readable storage medium having stored thereon computer program instructions, which, when executed by a processor, cause the processor to execute the method of power adjustment in a MIMO-NOMA system.
Compared with the prior art, the invention has the advantages that:
the embodiment of the invention determines the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver, calculates the uplink signal-to-noise ratio of each user according to the uplink reference signal power and the path loss of each user, determines the power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user, and sends the power control instruction to the corresponding user, so that the user adjusts the transmitting power of the user according to the power control instruction, the transmitting power of each user meets the demodulation requirement of the base station receiver, the base station receiver demodulates the user signal, the spectrum efficiency of the system is improved, and the access capacity of the system is increased.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a MIMO-NOMA system model;
fig. 1(a) is a schematic diagram of an uplink transmission process of MIMO-NOMA;
FIG. 1(b) is a schematic diagram of a MIMO-NOMA uplink receiving process;
fig. 1(c) is a schematic diagram of a MIMO-NOMA downlink transmission process;
fig. 1(d) is a schematic diagram of a MIMO-NOMA downlink reception process;
fig. 2 is a schematic flow chart of a power adjustment method in a MIMO-NOMA system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power adjustment apparatus in a MIMO-NOMA system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic diagram of a MIMO-NOMA system model, where fig. 1(a) is a schematic diagram of an uplink transmission process, fig. 1(b) is a schematic diagram of an uplink reception process, fig. 1(c) is a schematic diagram of a downlink transmission process, and fig. 1(d) is a schematic diagram of a downlink reception process.
As shown in fig. 1(a), information generated by different users is first subjected to channel coding and modulation, then subjected to layer mapping and precoding to different antennas, and finally subjected to PDMA coding and OFDM modulation to be transmitted;
as shown in fig. 1(b), after receiving signals of different users, the base station performs OFDM demodulation, PDMA detection, space-time decoding, demodulation, and channel detection, first detects a user signal with the largest power, then eliminates the user signal, and detects signals of other users respectively;
as shown in fig. 1(c), the base station performs channel coding and modulation on signals of different users, then performs layer mapping and precoding on the signals to different antenna ports, multiplexes the signals of different users in the same Resource Element (RE) through PDMA coding, and finally transmits the multiplexed signals through OFDM modulation;
as shown in fig. 1(d), the user receives signals from different antennas, and the signals are first demodulated through OFDM, then subjected to PDMA multi-user detection, space-time decoding, demodulation, and finally recovered through a channel decoding process. In the PDMA multi-user detection process, a user with high power is detected first, and if the signal is the signal of the user, the detection is stopped; otherwise, the detected high-power user signal is eliminated from the received signal, and the detection is continued.
Various specific embodiments of the present invention are described in detail below:
fig. 2 is a schematic flow chart of a power adjustment method in a MIMO-NOMA system according to an embodiment of the present invention, as shown in fig. 2, the method includes:
101. determining the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver;
in the NOMA-MIMO system, the 3GPP protocol does not specify how to configure the initial transmit power of multiple users on each RE, and the embodiment of the present invention takes multiplexing two users per RE as an example to illustrate how to configure the initial transmit power of two users on each RE.
Let PPUSCH,c(i) For a user to initially transmit power on cell C in corresponding subframe i or slot i,
Figure GDA0002714686780000051
wherein, PCMAX,c(i) Is the maximum transmission power, M, of the User Equipment (User Equipment, hereinafter referred to as UE) on the corresponding subframe i or time slot i of the cell CPUSCH,c(i) The number of Resource blocks (RB for short) on a corresponding subframe i or slot i on a cell C of a PUSCH channel, PO_PUSCH,c(j) Including cell level parameters PO_nominal_PUSCH(j) And UE level parameter PO_UE_PUSCH(j)，αc(j) For system configuration, PLcRepresenting the value of the path loss, Δ, from the subscriber to the base stationTF,c(i) Determined by the UE level parameter deltaMCS-Enabled, fc(i) For the current PUSCH power control adjustment state, fc(i)＝fc(i-1)+δPUSCH,c(i-KPUSCH)，δPUSCH,c(i-KPUSCH) From (i-K)PUSCH) Subframe Transmission Power Control (TPC) command determination, e.g., command δPUSCH,c± 1 indicates that the power control command is to increase or decrease the initial transmit power of the user, δPUSCH,c0 means that the initial transmit power for the user is not adjusted.
Specifically, in order to ensure that the SIC receiver of the base station can demodulate different user signals, assuming that the SIC receiver first demodulates a first user signal, the initial transmit power of each user determined according to the path loss of each user and the demodulation threshold of the base station receiver needs to satisfy:
the actual transmitting power of the first user is larger than the sum of the actual transmitting power of the other users and the demodulation threshold of the base station receiver, and the actual transmitting power is the difference between the initial transmitting power of each user and the corresponding path loss.
Specifically, let PPUSCH,C,1Is the initial transmit power, P, of the first userPUSCH,C,2Is the initial transmit power of the second user, when PL1＜PL2When it is, then
PPUSCH,C,1-PL1＞PPUSCH,C,2-PL2+α'Thr
Wherein PL1Path loss, PL, for the first user2Is the road loss of the second user, alpha'ThrFor the demodulation threshold, P, of the SIC receiver of the base stationPUSCH,C,1-PL1Is the received power, P, of the first userPUSCH,C,2-PL2Is the received power of the second user.
If there are three users per RE, when PL1＜PL2When it is, then
PPUSCH,C,1-PL1＞(PPUSCH,C,2-PL2)+(PPUSCH,C,3-PL3)+α'Thr
Wherein PL3Path loss for the third user, PPUSCH,C,3Initial transmission power P for third userPUSCH,C,3-PL3Is the received power of the third user. By analogy, the downlink initial power allocation of multiplexing multiple users on each RE can be obtained.
In the embodiment of the invention, the maximum transmitting power of a user is 23dBm, the bandwidth of an uplink signal is 20MHz, and then M isPUSCH,c(i) 100, cell level parameter PO_nominal_PUSCH(j) Configuration-80, UE level parameter PO_UE_PUSCH(j) Is configured as 0; deltaTF,c(i)＝0，fc(i)＝0；
Suppose base station SIC receiver demodulation threshold alpha'Thr4dB, path loss PL for the first user180dB, path loss PL of the second user2Is 95dB, then
Figure GDA0002714686780000061
Obtaining initial transmitting power, P, of the first user and the second userPUSCH,C,1＝20dBm，PPUSCH,C,223dBm, the received power P of the first user isPUSCH,C,1-PL1Is-60 dBm, the received power P of the second userPUSCH,C,2-PL2Is-72 dBm.
102. Calculating the uplink signal-to-noise ratio of each user according to the uplink reference signal power of each user and the corresponding path loss;
is P'rx1Is the signal strength, P 'of the first user received by the base station'rx2Is the signal strength, SINR ', of the second user received by the base station'1Is the uplink signal-to-noise ratio, SINR 'of the first user'2Is the uplink signal-to-noise ratio of the second user, when P'rx1＞P′rx2When it is, then
Figure GDA0002714686780000071
Figure GDA0002714686780000072
Wherein, Psrs,1Is the uplink reference signal power, P, of the first usersrs,2Is the uplink reference signal power, I 'of the second user'other1Is interference information, I ', of other uplink cell users to the first user'other2Is the interference of other uplink cell users to the second user, N'oIs base station noise floor.
Similarly, when P'rx1＜P′rx2When the temperature of the water is higher than the set temperature,
Figure GDA0002714686780000073
Figure GDA0002714686780000074
because each user is in continuous motion, the path loss and interference of each user also change for many times, so that the signal-to-noise ratio also changes, and therefore, the uplink signal-to-noise ratio of each user needs to be calculated for many times.
103. And configuring a power control instruction of each user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of each user, and sending the power control instruction to the corresponding user, so that the user can adjust the transmitting power of the user according to the power control instruction.
The method for determining the power control instruction of each user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of each user comprises the following steps:
and determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to the NP criterion, and if so, configuring a power control instruction of each user according to the initial transmitting power.
Specifically, when P'rx1＞P′rx2If so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is kept unchanged;
further, when P'rx1＞P′rx2If so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is decreased by a third preset value;
or when P'rx1＞P′rx2And if so, configuring a power control instruction for increasing the initial transmission power of the first user and the second user by a second preset value at the same time.
In this embodiment of the present invention, the second preset value and the third preset value may be the same or different, and this is not specifically limited in this embodiment of the present invention, specifically, the second preset value and the third preset value may be one or more step lengths, and specifically, the second preset value and the third preset value may be set according to a speed of power adjustment.
Note that, in example of the present invention, P'rx1＞P′rx2Is determined by the steps ofThe step of determining whether the uplink signal-to-noise ratios of each user meet the specified conditions according to the NP criterion can also be exchanged, and the embodiment of the invention does not limit the sequential execution relationship of the two steps.
TABLE 1 initial transmit power adjustment table for each user, where SINRThr1Is SINR'1Low threshold, SINRThr2Is SINR'2The low threshold of (c).
TABLE 1 (P'rx1＞P′rx2)
Figure GDA0002714686780000081
Further, before determining the power control command of each user according to the uplink signal-to-noise ratio and the initial transmission power of each user, the method further includes:
judging whether the current time slot is in the power adjusting period, if so, executing the step of determining the power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user.
In the NP rule of the embodiment of the present invention, N is 4, P is 3, and SINRThr1＝0dB，SINRThr26dB, if the current time slot is in the power adjustment period, P'rx1＞P′rx2SINR of the first user'1{10, 8, 6, 6}, SINR 'of the second user, respectively'2{4, 5, 5, 6} respectively, the initial transmit powers of the first user and the second user are obtained according to table 3 without adjustment, so the base station will issue the TPC command δ through the PDCCH channelPUSCH,cAnd (4) setting the initial transmission power of the first user and the initial transmission power of the second user to be 0.
And after each user receives the power control instruction sent by the base station, adjusting the own transmitting power according to the corresponding power control instruction.
For example, after receiving a power control command to increase the initial transmit power of a first user, the first user increases the initial transmit power by a first specified number of steps, and after receiving a power control command to decrease the initial transmit power of a second user, the second user decreases the initial transmit power by a second specified number of steps.
The embodiment of the invention determines the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver, calculates the uplink signal-to-noise ratio of each user for multiple times according to the uplink reference signal power and the path loss of each user, determines the power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user, and sends the power control instruction to the corresponding user, so that the user adjusts the transmitting power of the user according to the power control instruction, the transmitting power of each user meets the demodulation requirement of the base station receiver, the base station receiver demodulates the user signal, the spectrum efficiency of the system is improved, and the access capacity of the system is increased.
Fig. 3 is a schematic diagram of a power adjustment apparatus in a MIMO-NOMA system according to an embodiment of the present invention, as shown in fig. 3, the apparatus includes: a determination module 11, a calculation module 12 and a configuration module 13;
the determining module 11 is configured to determine an initial transmit power of each user according to the path loss of each user and a demodulation threshold of the base station receiver;
specifically, the actual transmission power of the first user determined by the determining module 11 is greater than the sum of the actual transmission power of the remaining users and the demodulation threshold of the base station receiver, and the actual transmission power is the difference between the initial transmission power of each user and the corresponding path loss.
A calculating module 12, configured to calculate an uplink signal-to-noise ratio of each user according to the uplink reference signal power and the path loss of each user;
and the configuration module 13 is configured to configure a power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmit power of each user, and send the power control instruction to a corresponding user, so that the user adjusts the transmit power of the user according to the power control instruction.
Specifically, the configuration module 13 includes a determination unit and a configuration unit;
a determining unit, configured to determine whether the uplink snr of each user meets a specified condition according to an NP criterion, and if so, trigger the configuration unit;
and the configuration unit is used for configuring the power control instruction of each user according to the initial transmitting power.
The embodiment of the present invention takes two multiplexing users per RE as an example to describe how to allocate downlink power of two users per RE, but is not limited to multiplexing two users per RE.
Wherein the determining unit comprises a first determining subunit and a second determining subunit;
a first determining subunit for determining P'rx1＞P′rx2If so, triggering a second determining subunit;
a second determining subunit, configured to determine whether P SINRs of the N SINRs of the first user are smaller than a low threshold, and if so, trigger the configuration unit;
and the configuration unit is used for configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is kept unchanged.
It should be noted that, in the embodiment of the present invention, the order of the first determining subunit and the second determining subunit may also be exchanged, and the embodiment of the present invention does not limit the sequential action relationship between the first determining subunit and the second determining subunit. For example, the second determining subunit is configured to determine whether P SINR is less than a low threshold among N SINR of the first user, and if so, trigger the first determining subunit;
accordingly, a first determining subunit is used to determine P'rx1＞P′rx2The configuration unit is triggered.
Or, the second determining subunit is configured to determine whether P SINR is less than a low threshold among N SINR of the first user, and determine whether P SINR is greater than a high threshold among N SINR of the second user, and if so, trigger the configuration unit;
correspondingly, the configuration unit is configured to configure a power control instruction for increasing the initial transmit power of the first user by a second preset value and decreasing the initial transmit power of the second user by a third preset value.
Or, the second determining subunit is configured to determine whether P SINR is greater than the low threshold among N SINR of the first user and whether P SINR is less than the low threshold among N SINR of the second user, and if so, trigger the configuration unit;
correspondingly, the configuration unit is used for configuring the initial transmitting power of the first user and the initial transmitting power of the second user and increasing the power control instruction of the second preset value.
Further, the embodiment of the present invention further includes a determining module, configured to determine whether the current timeslot is within the power adjustment period, and if so, trigger the configuration module.
The embodiment of the invention determines the initial transmitting power of each user according to the path loss of each user and the demodulation threshold of the base station receiver, calculates the uplink signal-to-noise ratio of each user for multiple times according to the uplink reference signal power and the path loss of each user, determines the power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user, and sends the power control instruction to the corresponding user, so that the user adjusts the transmitting power of the user according to the power control instruction, the transmitting power of each user meets the demodulation requirement of the base station receiver, the base station receiver demodulates the user signal, the spectrum efficiency of the system is improved, and the access capacity of the system is increased.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and the electronic device according to an embodiment of the present application is described below with reference to fig. 4.
As shown in fig. 4, the electronic device 100 includes one or more processors 101 and memory 102.
The processor 101 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 100 to perform desired functions.
Memory 102 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, Random Access Memory (RAM), cache memory (cache), and/or the like. The non-volatile memory may include, for example, Read Only Memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium and executed by the processor 101 to implement the power adjustment method in the MIMO-NOMA system of the various embodiments of the present application described above and/or other desired functions.
In one example, the electronic device 100 may further include: an input device 103 and an output device 104, which are interconnected by a bus system and/or other form of connection mechanism (not shown).
For example, the input device 103 may include a camera device for capturing an input image. The input device 103 may also include, for example, a keyboard, a mouse, and the like.
The output device 104 may output various information to the outside, including the determined foreground mask feature map. The output devices 104 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for the sake of simplicity, only some of the components related to the present application in the electronic device 100 are shown in the diagram 100, and components such as a bus, an input/output interface, and the like are omitted. In addition, electronic device 100 may include any other suitable components depending on the particular application.
Exemplary computer program product and computer-readable storage Medium
In addition to the above-described methods and apparatus, embodiments of the present application may also be a computer program product comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps in the method of power adjustment in a MIMO-NOMA system according to various embodiments of the present application described in the "exemplary methods" section of this specification above.
The computer program product may be written with program code for performing the operations of embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present application may also be a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps in the method of power adjustment in a MIMO-NOMA system according to various embodiments of the present application described in the "exemplary methods" section of this specification above.
The computer-readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.

Claims (10)

1. A power adjustment method in a MIMO-NOMA system comprises the following steps:
determining initial transmitting power of two users according to the path loss of the two users and a demodulation threshold of a base station receiver, wherein the signal power difference of the two users received by the base station is larger than the demodulation threshold of the base station receiver;
comparing the signal powers of the two users received by the base station, wherein the one with the larger signal power is taken as a first user, and the other one is taken as a second user;
calculating the uplink signal-to-noise ratio of the first user and the second user according to the uplink reference signal power and the path loss of the first user and the second user according to the following formula,
wherein the first user signal-to-noise ratio is
Figure FDA0002714686770000011
The second user signal-to-noise ratio is
Figure FDA0002714686770000012
Wherein, Psrs,1Is the uplink reference signal power, P, of the first usersrs,2Is the uplink reference signal power, I 'of the second user'other1Is interference information, I ', of other uplink cell users to the first user'other2Is the interference of other uplink cell users to the second user, N'oBase station noise is set;
and configuring power control instructions of the first user and the second user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of the first user and the second user, and sending the power control instructions to the first user and the second user so that the first user and the second user can adjust the transmitting power of the first user and the second user according to the power control instructions.
2. The method of claim 1, wherein the initial transmit power of each user determined according to the path loss of each user and the demodulation threshold of the base station receiver is satisfied:
the actual transmitting power of the first user is larger than the sum of the actual transmitting power of the other users and the demodulation threshold of the base station receiver, and the actual transmitting power is the difference between the initial transmitting power of each user and the corresponding path loss.
3. The method of claim 1, wherein determining a power control command for each user based on a plurality of uplink snrs and initial transmit powers for each user comprises:
and determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to the NP criterion, and if so, configuring a power control instruction of each user according to the initial transmitting power.
4. The method of claim 3, wherein a first user and a second user are multiplexed on each RE;
determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to NP criteria, and if so, configuring a power control instruction of each user according to initial transmitting power, wherein the power control instruction comprises the following steps:
when P'rx1＞P′rx2If so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is kept unchanged; p'rx1Is the signal power, P ', of the first user received by the base station'rx2Signal power of a second user received for the base station;
when P'rx1＞P′rx2And if so, configuring a power control instruction that the initial transmitting power of the first user is increased by a second preset value and the initial transmitting power of the second user is decreased by a third preset value.
5. The method of claim 3, wherein a first user and a second user are multiplexed on each RE;
determining whether a plurality of uplink signal-to-noise ratios of each user meet a specified condition according to NP criteria, and if so, configuring a power control instruction of each user according to initial transmitting power, wherein the power control instruction comprises the following steps:
when P'rx1＞P′rx2If so, configuring a power control instruction for increasing the initial transmission power of the first user and the second user by a second preset value at the same time; p'rx1Is the signal power, P ', of the first user received by the base station'rx2The signal power of the second user received by the base station.
6. The method according to any one of claims 1 to 5, wherein before determining the power control command of each user according to the uplink signal-to-noise ratio and the initial transmission power of each user, further comprising:
and judging whether the current time slot is in a power regulation period, if so, executing a step of configuring a power control instruction of each user according to the uplink signal-to-noise ratio and the initial transmitting power of each user.
7. A power adjustment apparatus in a MIMO-NOMA system, comprising:
a determining module, configured to determine initial transmit powers of two users according to path losses of the two users and a demodulation threshold of a base station receiver, where a power difference between signals received by the base station by the two users is greater than the demodulation threshold of the base station receiver;
a calculation module to:
comparing the signal powers of the two users received by the base station, wherein the one with the larger signal power is taken as a first user, and the other one is taken as a second user;
calculating the uplink signal-to-noise ratio of the first user and the second user according to the uplink reference signal power and the path loss of the first user and the second user according to the following formula,
wherein the first user signal-to-noise ratio is
Figure FDA0002714686770000031
The second user signal-to-noise ratio is
Figure FDA0002714686770000032
Wherein, Psrs,1Is the uplink reference signal power, P, of the first usersrs,2Is the uplink reference signal power, I 'of the second user'other1Is interference information, I ', of other uplink cell users to the first user'other2Is the interference of other uplink cell users to the second user, N'oBase station noise is set;
and the configuration module is used for configuring power control instructions of the first user and the second user according to the plurality of uplink signal-to-noise ratios and the initial transmitting power of the first user and the second user, and sending the power control instructions to the first user and the second user so that the first user and the second user can adjust the transmitting power of the first user and the second user according to the power control instructions.
8. The apparatus of claim 7, wherein the configuration module comprises:
a determining unit, configured to determine whether the uplink snr of each user meets a specified condition according to an NP criterion, and if so, trigger the configuration unit;
and the configuration unit is used for configuring the power control instruction of each user according to the initial transmitting power.
9. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
the executable instructions, when executed by the processor, cause the processor to perform the method of power scaling in a MIMO-NOMA system of any of claims 1 to 7.
10. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform a method of power adjustment in a MIMO-NOMA system as claimed in any of claims 1 to 7.
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