CN110233650B - Power adjustment method and system in MIMO-NOMA system - Google Patents

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

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CN110233650B
CN110233650B CN201910383034.6A CN201910383034A CN110233650B CN 110233650 B CN110233650 B CN 110233650B CN 201910383034 A CN201910383034 A CN 201910383034A CN 110233650 B CN110233650 B CN 110233650B
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power
downlink
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cqi
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CN110233650A (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
    • 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
    • H04W52/143—Downlink 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
    • 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
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • 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

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Abstract

The invention provides a power adjusting method in a MIMO-NOMA system. The method comprises the following steps: determining the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user; and adjusting the downlink initial power of each user according to the received CQI reported by each user. The distribution of the downlink power of each user meets the demodulation requirement of the user receiver, so that the user can demodulate the signal, the spectrum efficiency of the system is improved, and the access capacity of the system is increased.

Description

Power adjustment method and system in MIMO-NOMA system
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a power adjustment method and system 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 system for adjusting power 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 downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;
and adjusting the downlink initial power of each user according to the received CQI reported by each user.
In the above method, determining the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user includes:
the downlink initial power of the first user is larger than the sum of the downlink initial power of the other users and the demodulation threshold of the user receiver; the path loss of the first user is less than that of the other users;
the difference between the downlink initial power of each user and the corresponding path loss is larger than the coverage threshold;
the sum of the downlink initial power of the different users on each RE is equal to the power per RE.
In the above method, adjusting the downlink initial power of each user according to the received CQI reported by each user includes:
and determining whether the CQI reported by each user meets a specified condition according to NP criteria, and if so, adjusting the downlink initial power of each user.
In the above method, each RE multiplexes a first user and a second user;
correspondingly, determining whether the CQI reported by each user meets the specified conditions according to NP criteria, if so, adjusting the downlink initial power of each user, comprising:
determining whether P CQI values in the N CQI values reported by the first user and the second user are smaller than a low threshold, if so, increasing the downlink initial power of the first user by a first preset value and reducing the downlink initial power of the second user by the first preset value when the received signal strength of the first user is determined to be larger than the signal strength of the second user; when the signal intensity received by the first user is determined to be smaller than the signal intensity of the second user, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
Or, determining whether P CQI values in the N CQI values reported by the first user are greater than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold or not, if so, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
Or, determining whether P CQI values in the N CQI values reported by the first user are smaller than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are larger than the low threshold or not, if so, increasing the downlink initial power of the first user by a first preset value, and reducing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
Before adjusting the downlink power allocated to each user according to the received CQI reported by each user, the method further includes:
and judging whether the current time slot is in a power adjustment period, if so, executing a step of adjusting downlink power distributed to each user according to the received CQI reported by each user.
The method further comprises the following steps:
the user end determines the power of the downlink channel state information reference signal of each user according to the power of the downlink channel state information reference signal of the base station and the distribution proportion of the downlink initial power;
the user side calculates the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
and the user side maps the SINRs of each user into corresponding CQI and sends the CQI to the base station.
In another aspect, the present invention provides a power adjustment system in a MIMO-NOMA system, including:
the first determining module is used for determining the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;
a second determining module, configured to determine, according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation proportion, the downlink channel state information reference signal power of each user;
the calculation module is used for calculating the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
the mapping module is used for mapping the SINRs of each user into corresponding CQIs and sending the CQIs to the adjusting module;
and the adjusting module is used for adjusting the downlink initial power of each user according to the received CQI reported by each user.
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:
1) the embodiment of the invention determines the downlink initial power of each user on each RE according to the downlink power of each RE and the path loss of each user, and then adjusts the downlink initial power of each user according to the received CQI reported by each user, so that the downlink power distribution of each user meets the demodulation requirement of a user receiver, the user receiver demodulates the signal, the spectrum efficiency of the system is improved, and the access capacity of the system is increased.
2) The method comprises the steps that a user side determines the power of a downlink channel state information reference signal of each user according to the power of the downlink channel state information reference signal of a base station and a downlink initial power distribution proportion, then the user side calculates the downlink signal-to-noise ratio of each user according to the power and the path loss of the downlink channel state information reference signal of each user, finally the user side maps a plurality of SINRs of each user into corresponding CQIs and sends the CQIs to the base station, the base station adjusts the downlink initial power of each user according to the CQIs, the distribution of the downlink power of each user meets the demodulation requirements of a user receiver, and therefore the user receiver can demodulate signals, the spectrum efficiency of a 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. 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 structural diagram of a power adjustment system in a MIMO-NOMA system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power adjustment system in another MIMO-NOMA system according to an embodiment of the present invention;
fig. 5 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 downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;
in the NOMA-MIMO system, each RE has multiple user multiplexes, and the 3GPP protocol does not specify how to allocate downlink power of different users of each RE, and the embodiment of the present invention takes two users multiplexed per RE as an example to explain how to allocate downlink power of two users of each RE.
In the 3GPP protocol, the downlink power per RE is set as PRE，
Figure BDA0002053963550000061
Wherein N isBSIs an antenna of a base station and is,
Figure BDA0002053963550000062
for the power per RE of the downlink single antenna,
Figure BDA0002053963550000063
wherein the content of the first and second substances,
Figure BDA0002053963550000064
is the maximum transmit power of the base station, af is the carrier spacing,
Figure BDA0002053963550000065
for the number of RBs in the downlink,
Figure BDA0002053963550000066
as the number of carriers per RB.
Assuming that the path loss of the first user is smaller than that of the second user, the downlink initial power allocation of each RE different user needs to meet the following requirements:
the downlink initial power of the first user is larger than the sum of the downlink initial power of the other users and the demodulation threshold of the user receiver; the path loss of the first user is less than that of the other users;
the difference between the downlink initial power of each user and the corresponding path loss is larger than the coverage threshold;
the sum of the downlink initial power of the different users on each RE is equal to the power per RE.
For example, let PL1Path loss, PL, for the first user2Path loss for the second user, Pdown1Is the downlink initial power, P, of the first userdown2Is the downlink initial power of the second user, when PL1＜PL2Time of flight
Figure BDA0002053963550000067
Wherein alpha isThrDemodulation threshold, beta, for user SIC receiverThrIs the coverage threshold.
Similarly, if the second user path loss is smaller than the first user path loss, PL1＞PL2And downlink initial power allocation of different users per RE needs to meet the following requirements:
Figure BDA0002053963550000068
if there are three users per RE, when PL1＜PL2，PL1＜PL3Time of flight
Figure BDA0002053963550000069
Wherein, Pdown3And the downlink initial power is the downlink initial power of the third user, and so on, the downlink initial power distribution of the multiplexing multiple users on each RE can be obtained.
In the embodiment of the invention, the base station is assumed to be two antennas, the maximum transmitting power of the base station is 46dBm, the bandwidth of a downlink signal is 20MHz, the base station comprises 100RB, each RB comprises 12 REs, and the path loss of two users multiplexed by each RE is respectively 80dB and 95dB, then P isREIs PRE＝46dBm-10log(100*12)＝15dBm
Setting demodulation threshold alpha of user SIC receiverThrIs 6dB, the coverage threshold is betaThrAt-110 dBm, the path loss PL of the first user180dB, path loss PL of the second user2Is 95dB, then
Figure BDA0002053963550000071
Obtaining the downlink initial power, P, of the first user and the second userdown1＝12，Pdown2＝3。
Further, the embodiment of the present invention further includes:
a. the user end determines the power of the downlink channel state information reference signal of each user according to the power of the downlink channel state information reference signal of the base station and the distribution proportion of the downlink initial power;
the embodiment of the present invention continues to be explained by taking an example of multiplexing two users per RE, where P is setCRSIs a downlink channel state information reference signal of a base station,
Figure BDA0002053963550000072
in order to allocate the proportion of the downlink power,
Figure BDA0002053963550000073
which can be obtained according to step 101 of the method shown in fig. 1, PCRS，1Is a downlink channel state information reference signal, P, of a first userCRS，2Is the downlink channel state information reference signal of the second user, then
Figure BDA0002053963550000074
Figure BDA0002053963550000075
b. The user side calculates the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
let SINR1Is the downlink signal-to-noise ratio, SINR of the first user2Is the downlink signal-to-noise ratio of the second user, when Prx1＞Prx2When the first user and the second user are in use, the SIC receivers of the first user and the second user demodulate the signal of the first user first and then demodulate the signal of the second user, and then
Figure BDA0002053963550000076
Figure BDA0002053963550000077
Wherein, Iother1For downlink interference information from other cells to the first user, Iother2For the interference information of other downlink cells to the second user, No,1Is the background noise of the first user, No,2Is the noise floor of the second user.
In the same way, when Prx1＜Prx2When it is, then
Figure BDA0002053963550000081
Figure BDA0002053963550000082
c. And the user side maps the SINRs of each user into corresponding CQI and sends the CQI to the base station, so that the base station adjusts the downlink initial power of each user according to the CQI.
Table 1 is a 4-bit CQI table in the 3GPP protocol, and as shown in table 1, there are 16 CQIs, that is, the channel quality is quantized to a sequence number of 0 to 15, and each CQI corresponds to one modulation and coding scheme, so that the downlink power corresponding to each user can be determined.
TABLE 1
Figure BDA0002053963550000083
102. And adjusting the downlink initial power of each user according to the received CQI reported by each user.
It should be noted that the adjustment of the downlink power is determined by the base station, and the base station, which serves as the transmitting end, does not know how to the channel condition, so the base station adjusts the downlink initial power of each user according to the CQI reported by the receiving user, and obtains the final downlink power of each user.
The following describes specifically a process of the base station adjusting the downlink initial power of the user:
and determining whether the CQI reported by each user meets a specified condition according to NP criteria, and if so, adjusting the downlink initial power of each user.
Specifically, whether P CQI values in N CQI values reported by a first user and a second user are smaller than a low threshold or not is determined, if so, when the strength of a signal received by the first user is determined to be larger than that of the second user, the downlink initial power of the first user is reduced by a first preset value, and the downlink initial power of the second user is reduced by a first preset value;
when the signal intensity received by the first user is determined to be smaller than the signal intensity of the second user, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
Or, determining whether P CQI values in the N CQI values reported by the first user are greater than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold or not, if so, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
Or, determining whether P CQI values in the N CQI values reported by the first user are smaller than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are larger than the low threshold or not, if so, increasing the downlink initial power of the first user by a first preset value, and reducing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
In this embodiment of the present invention, the first preset value may be one or more step lengths, and specifically, the first preset value may be set according to a speed of power adjustment, which is not specifically limited in this embodiment of the present invention.
Table 2 is a table for adjusting downlink initial power according to CQI, wherein CQI1CQI reported for a first user, CQI2CQI reported for a second user, CQIThr1Is CQI1Low threshold of (CQI)Thr2Is CQI2Low threshold of (P)rx1For the signal strength, P, received by the first userrx2The received signal strength for the second user.
TABLE 2
Figure BDA0002053963550000101
Further, before adjusting the downlink power allocated to each user according to the received CQI reported by each user, the method further includes:
and judging whether the current time slot is in a power adjustment period, if so, executing a step of adjusting downlink power distributed to each user according to the received CQI reported by each user.
The NP criterion of the embodiment of the invention is set as N-4, P-3 and CQIThr1＝4，CQIThr2If the current time slot is in the power adjustment period, the CQI reported by the first user is 4, 3, 2, respectively,that is, 3 of the 4 CQIs reported by the first user are less than the low threshold, and the 4 CQIs reported by the second user are {6, 7, 7, 8} respectively, that is, the 4 CQIs reported by the second user are all greater than the low threshold, the downlink initial power of the first user is increased by a first preset value, the downlink initial power of the second user is decreased by the first preset value, and the first preset value is set to be 0.5dBm, so that the downlink initial power of the first user is increased by 0.5dBm, and the downlink initial power of the second user is decreased by 0.5 dBm.
The embodiment of the invention determines the downlink initial power of each user on each RE according to the downlink power of each RE and the path loss of each user, and then adjusts the downlink initial power of each user according to the received CQI reported by each user, so that the downlink power distribution of each user meets the demodulation requirement of a user receiver, the user receiver demodulates signals, the spectrum efficiency of a system is improved, and the access capacity of the system is increased; and simultaneously, the user side determines the power of the reference signal of the downlink channel state information of each user according to the power of the reference signal of the downlink channel state information of the base station and the distribution proportion of the downlink initial power, then the user side calculates the downlink signal-to-noise ratio of each user according to the power of the reference signal of the downlink channel state information of each user and the path loss, and finally the user side maps a plurality of SINRs of each user into corresponding CQIs and sends the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQIs, the distribution of the downlink power of each user meets the demodulation requirements of a user receiver, the user receiver can demodulate the signals, the spectral efficiency of a system is improved, and the access capacity of the system is.
Fig. 3 is a schematic structural diagram of a power adjustment system in a MIMO-NOMA system according to an embodiment of the present invention, as shown in fig. 3, the system includes: a first determination module 11 and an adjustment module 12;
a first determining module 11, configured to determine, according to the downlink per-RE power and the path loss of each user, a downlink initial power of each user on each RE;
specifically, the downlink initial power of the first user determined by the first determining module 11 is greater than the sum of the downlink initial power of the remaining users and the demodulation threshold of the user receiver; the path loss of the first user is less than that of the other users;
the difference between the downlink initial power of each user and the corresponding path loss is larger than the coverage threshold;
the sum of the downlink initial power of the different users on each RE is equal to the power per RE.
And an adjusting module 12, configured to adjust the downlink initial power of each user according to the received CQI reported by each user.
Fig. 4 is a schematic structural diagram of a power adjustment system in another MIMO-NOMA system according to an embodiment of the present invention, further including: a second determination module 21, a calculation module 22 and a mapping module 23;
a second determining module 21, configured to determine, according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation proportion, the downlink channel state information reference signal power of each user;
a calculating module 22, configured to calculate a downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
and a mapping module 23, configured to map the multiple SINRs of each user into corresponding CQIs, and send the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQIs.
Specifically, the adjusting module 12 includes a determining unit and an adjusting unit;
a determining unit, configured to determine whether the CQI reported by each user meets a specified condition according to an NP criterion, and if so, trigger the adjusting unit;
and the adjusting unit is used for adjusting the downlink initial power of each user.
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.
Further, the determining unit comprises a first determining subunit and a second determining subunit; the adjusting unit comprises a first adjusting subunit and a second adjusting subunit;
the first determining subunit is used for determining whether P CQI values in the N CQI values reported by the first user and the second user are smaller than a low threshold, and if so, triggering the second determining subunit;
the second determining subunit is used for determining whether the signal strength received by the first user is greater than that of the second user, and if so, the first adjusting subunit is triggered; otherwise, triggering a second adjusting subunit;
a first adjusting subunit, configured to reduce the downlink initial power of the first user by a first preset value, and reduce the downlink initial power of the second user by the first preset value;
a second adjusting subunit, configured to reduce the downlink initial power of the first user by a first preset value, and increase the downlink initial power of the second user by the first preset value;
and after the first adjusting subunit or the second adjusting subunit adjusts, the sum of the downlink power of the first user and the downlink power of the second user is equal to the power per RE.
Or, the determining unit is configured to determine whether P CQI values of the N CQI values reported by the first user are greater than the low threshold, and whether P CQI values of the N CQI values reported by the second user are less than the low threshold, and if so, trigger the adjusting unit;
correspondingly, the adjusting unit is used for reducing the downlink initial power of the first user by a first preset value and increasing the downlink initial power of the second user by the first preset value;
the sum of the downlink power of the first user and the downlink power of the second user after being adjusted by the adjusting unit is equal to the power per RE.
Or, the determining unit is configured to determine whether P CQI values of the N CQI values reported by the first user are smaller than a low threshold, and whether P CQI values of the N CQI values reported by the second user are larger than the low threshold, and if so, trigger the adjusting unit;
correspondingly, the adjusting unit is configured to increase the downlink initial power of the first user by a first preset value, and decrease the downlink initial power of the second user by the first preset value;
the sum of the downlink power of the first user and the downlink power of the second user after being adjusted by the adjusting unit is equal to the power per RE.
Further, the embodiment of the present invention further includes a determining module, configured to determine whether the current time slot is within the power adjustment period, and if so, trigger the adjusting module.
The embodiment of the invention determines the downlink initial power of each user on each RE according to the downlink power of each RE and the path loss of each user, and then adjusts the downlink initial power of each user according to the received CQI reported by each user, so that the downlink power distribution of each user meets the demodulation requirement of a user receiver, the user receiver demodulates signals, the spectrum efficiency of a system is improved, and the access capacity of the system is increased; further, in the embodiment of the present invention, the user end determines the power of the reference signal of the downlink channel state information of each user according to the power of the reference signal of the downlink channel state information of the base station and the allocation proportion of the downlink initial power, then the user end calculates the downlink signal-to-noise ratio of each user according to the power of the reference signal of the downlink channel state information of each user and the path loss, and finally the user end maps a plurality of SINRs of each user to corresponding CQIs and sends the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQIs, and the allocation of the downlink power of each user meets the demodulation requirements of the user receiver, so that the user receiver can demodulate the signals, the spectral efficiency of the system is improved, and the access capacity of the system.
Fig. 5 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 the drawings.
As shown in fig. 5, 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 the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user, and meeting the following requirements:
the downlink initial power of the first user is larger than the sum of the downlink initial power of the other users and the demodulation threshold of the user receiver; the path loss of the first user is less than that of the other users;
the difference between the downlink initial power of each user and the corresponding path loss is larger than the coverage threshold;
the sum of the downlink initial power of different users on each RE is equal to the power of each RE;
and adjusting the downlink initial power of each user according to the received CQI reported by each user.
2. The method of claim 1, wherein adjusting the downlink initial power of each user according to the received CQI reported by each user comprises:
and determining whether the CQI reported by each user meets a specified condition according to NP criteria, and if so, adjusting the downlink initial power of each user.
3. The method of claim 2, wherein a first user and a second user are multiplexed on each RE;
determining whether the CQI reported by each user meets a specified condition according to NP criteria, if so, adjusting the downlink initial power of each user, comprising the following steps:
determining whether P CQI values in the N CQI values reported by the first user and the second user are smaller than a low threshold, if so, increasing the downlink initial power of the first user by a first preset value and reducing the downlink initial power of the second user by the first preset value when the received signal strength of the first user is determined to be larger than the signal strength of the second user; when the signal intensity received by the first user is determined to be smaller than the signal intensity of the second user, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
4. The method of claim 2, wherein a first user and a second user are multiplexed on each RE;
determining whether the CQI reported by each user meets a specified condition according to NP criteria, if so, adjusting the downlink initial power of each user, comprising the following steps:
determining whether P CQI values in the N CQI values reported by the first user are greater than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold or not, if so, reducing the downlink initial power of the first user by a first preset value, and increasing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
5. The method of claim 2, wherein a first user and a second user are multiplexed on each RE;
determining whether the CQI reported by each user meets a specified condition according to NP criteria, if so, adjusting the downlink initial power of each user, comprising the following steps:
determining whether P CQI values in the N CQI values reported by the first user are smaller than a low threshold or not, and whether P CQI values in the N CQI values reported by the second user are larger than the low threshold or not, if so, increasing the downlink initial power of the first user by a first preset value, and reducing the downlink initial power of the second user by the first preset value;
and the sum of the adjusted downlink power of the first user and the adjusted downlink power of the second user is equal to the power per RE.
6. The method according to any of claims 1 to 5, before adjusting the downlink power allocated to each user according to the received CQI reported by each user, further comprising:
and judging whether the current time slot is in a power adjustment period, if so, executing a step of adjusting downlink power distributed to each user according to the received CQI reported by each user.
7. The method of any of claims 1 to 5, comprising:
the user end determines the power of the downlink channel state information reference signal of each user according to the power of the downlink channel state information reference signal of the base station and the distribution proportion of the downlink initial power;
the user side calculates the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
and the user side maps the SINRs of each user into corresponding CQI and sends the CQI to the base station.
8. A power adjustment system in a MIMO-NOMA system, comprising:
the first determining module is used for determining the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;
a second determining module, configured to determine, according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation proportion, the downlink channel state information reference signal power of each user;
the calculation module is used for calculating the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and the path loss of each user;
the mapping module is used for mapping the SINRs of each user into corresponding CQIs and sending the CQIs to the adjusting module;
and the adjusting module is used for adjusting the downlink initial power of each user according to the received CQI reported by each user.
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 6.
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 6.
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