CN111866895B - Unauthorized frequency band mode selection method of 5G NR base station - Google Patents

Unauthorized frequency band mode selection method of 5G NR base station Download PDF

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CN111866895B
CN111866895B CN202010488474.0A CN202010488474A CN111866895B CN 111866895 B CN111866895 B CN 111866895B CN 202010488474 A CN202010488474 A CN 202010488474A CN 111866895 B CN111866895 B CN 111866895B
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mode selection
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frequency band
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CN111866895A (en
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费泽松
蒋逸凡
郭婧
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Beijing Institute of Technology BIT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Abstract

The invention provides an unauthorized frequency band mode selection method of a 5G NR base station, belonging to the technical field of wireless transmission. The invention sends a measurement report to a base station gNB serving the UE through the user terminal UE accessed to the 5G NR network, and a central server CS calculates the average SINR coverage probability of the whole 5G NR network according to the measurement report of the UE collected by the gNB
Figure DDA0002519985390000011
And according to
Figure DDA0002519985390000012
Informs the gNB of the completion of the unlicensed band mode selection with probability p. The method can provide better flexibility and better SINR coverage performance, is designed based on the new technology of the next generation mobile communication network, and can be more widely applied to the future 5G communication network; compared with the situation that mode selection is not carried out, the method can effectively improve the SINR coverage performance of the whole network under the scene that the 5G NR network and the Wi-Fi network coexist, and provides better communication service quality.

Description

Unauthorized frequency band mode selection method of 5G NR base station
Technical Field
The invention provides an unauthorized frequency band mode selection method of a 5G NR base station, belonging to the technical field of wireless transmission.
Background
Due to the development of various communication networks such as Wi-Fi and 5G, a Heterogeneous Network (HCN) becomes a dense networking architecture with a wide prospect, and has attracted extensive attention in academia and industry. Due to The scarcity of spectrum resources, in order to meet The communication requirements of a large number of intelligent devices, The next generation 5G mobile communication network (5G NR) uses an unauthorized frequency band, i.e., uses other communication networks such as Wi-Fi frequency bands to perform communication of The network. However, when the unlicensed frequency band is used, since the communication system of the 5G NR is incompatible with the communication systems of other communication networks, there is a problem that the communication system interferes with other communication networks. To solve this problem, an Unlicensed spectrum system (NR-U) of the 5G NR network is proposed. The 5G NR device under the unlicensed spectrum system can realize the compatibility with other communication systems by modifying the communication system of the device, thereby realizing the reduction of the interference with other communication networks and realizing the fair coexistence with the other communication networks. It is anticipated that a 5G NR device will have the capability to use both licensed and unlicensed frequency bands for communication.
However, with the development of dense networking, a large number of base stations of the 5G NR network are deployed, and co-channel interference among the base stations is aggravated. In this case, if all 5G NR devices use a single licensed or unlicensed band, the Signal to Interference plus Noise Ratio (SINR) coverage performance of the network will still be poor. To solve this problem, a mode selection method between two communication modes can be designed to improve the overall SINR coverage performance of the 5G NR network coexisting with other networks.
Disclosure of Invention
The invention aims to solve the problem of overall SINR coverage performance of an NR network and a Wi-Fi network when the NR network and the Wi-Fi network coexist in a dense networking scene, and provides an unauthorized frequency band mode selection method of a 5G NR base station.
The purpose of the invention is realized by the following technical scheme.
The unlicensed frequency band mode selection method relates to the following definitions:
defining the total number of base stations in a 5G NR network as M, and defining the index of an ith base station gNodeB, namely gNB as i; the number of user terminals served by gNB is denoted as NiSubscript i denotes the ith gNB, i ranging from 1 to M;
wherein, a User Equipment (UE) is abbreviated;
wherein, the subscript j represents the jth UE, and the value range of j is 1 to Ni(ii) a All base stations of the 5G NR network are connected to a central server;
wherein, the Central Server, namely Central Server, is abbreviated as CS;
an unauthorized frequency band mode selection method of a 5G NR base station comprises the following steps:
step 1: a user terminal UE accesses a 5G NR network through an authorized frequency band and sends a measurement report to a base station gNB serving the UE;
wherein, the sent measurement report comprises SINR information of the network;
step 2: traversing all base stations gNB, updating the number of user terminals UE served by the base stations gNB, and uploading the number of the UE and the average SINR coverage probability of all the served user terminals UE to a central server CS;
wherein, the number of user terminals served by the ith gNB is NiThe value range of i is 1 to M; the average SINR coverage probability of all user equipments UE served by the ith gNB is recorded as
Figure GDA0002681614180000021
Wherein the content of the first and second substances,
Figure GDA0002681614180000022
the average SINR coverage probability, which represents all UEs served by the ith gNB, is calculated by equation (1):
Figure GDA0002681614180000023
wherein, the SINRijThe SINR information of j UE served by ith gNB is represented, T is a known SINR coverage threshold, II (-) is an exemplary function, and the function value is 1 when the expression in (-) is true, otherwise, the function value is 0;
and step 3: the central server CS calculates the average SINR coverage probability of the whole 5G NR network
Figure GDA0002681614180000031
Wherein the content of the first and second substances,
Figure GDA0002681614180000032
the average SINR coverage probability representing the 5G NR network as a whole is calculated by equation (2):
Figure GDA0002681614180000033
and 4, step 4: the central server CS calculates a predetermined SINR coverage probability threshold P for the 5G NR network from the known parametersc-TsAnd judge it and
Figure GDA0002681614180000034
the magnitude relationship of (1), if
Figure GDA0002681614180000035
Then step 5 is executed; otherwise, ending the method;
wherein, Pc-TsCalculated by equation (3):
Figure GDA0002681614180000036
wherein the content of the first and second substances,
Figure GDA0002681614180000037
for an estimate of the overall SINR coverage probability of the Wi-Fi network prior to mode selection,
Figure GDA0002681614180000038
for an estimate of the overall SINR coverage probability of the Wi-Fi network after mode selection,
Figure GDA0002681614180000039
for an estimate of the overall SINR coverage probability of a 5G NR device using the unlicensed band after mode selection,
Figure GDA00026816141800000310
an estimate of the overall SINR coverage probability for a 5G NR device using the unlicensed frequency band after mode selection;
wherein the content of the first and second substances,
Figure GDA00026816141800000311
calculated from equation (4):
Figure GDA00026816141800000312
where μ is an exponential fading distribution parameter, σ2Is Gaussian white noise power, PWFor the transmission power of the Wi-Fi access point AP,
Figure GDA00026816141800000313
is a reference path loss value in an unlicensed frequency band, alpha is a path loss exponent,
Figure GDA00026816141800000314
represents an integral term of Wi-Fi network interference prior to mode selection,
Figure GDA00026816141800000315
a transmission success rate influence factor, gamma, of the Wi-Fi network before mode selection under an unauthorized frequency bandcsMonitoring thresholds of the Wi-Fi devices while channel listening for Wi-Fi,
Figure GDA00026816141800000316
as a function of the location distribution probability density of the Wi-Fi AP, r0D is a differential sign, and is an integral variable of a position distribution probability density function of the Wi-Fi AP; wherein the content of the first and second substances,
Figure GDA00026816141800000317
by
Figure GDA0002681614180000041
Calculation of fUC is the central frequency of the NR device using the unauthorized frequency band, c is the speed of light, and pi is a constant;
Figure GDA0002681614180000042
calculated from equation (5):
Figure GDA0002681614180000043
wherein λ isow(x,r0) Representative pairAn integral term of Wi-Fi AP density constituting the disturbance before mode selection, x is an integral variable of spatial distance to Wi-Fi AP constituting the disturbance, theta is an integral variable of angular orientation, and lambdaow(x,r0) Calculating according to the formula (6):
Figure GDA0002681614180000044
wherein λ isWTo cover the density of Wi-Fi APs in an area,
Figure GDA0002681614180000045
an estimate of the number of successfully transmitted Wi-Fi APs prior to mode selection,
Figure GDA0002681614180000046
calculated according to equation (7):
Figure GDA0002681614180000047
wherein Γ () is a gamma function;
Figure GDA0002681614180000048
calculated from equation (8):
Figure GDA0002681614180000049
wherein Q isW(r0,Γcs) Represents the probability of interference experienced by a transmitting Wi-Fi AP, as calculated by equation (9):
Figure GDA00026816141800000410
wherein r is an integral variable of the spatial distance of the Wi-Fi AP interfering with transmission;
Figure GDA00026816141800000411
calculated from equation (10):
Figure GDA00026816141800000412
wherein λ isNIs the density, P, of the coverage area gNBNIs the transmission power of the gbb and,
Figure GDA00026816141800000413
for the reference path loss value in the licensed band,
Figure GDA00026816141800000414
by
Figure GDA00026816141800000415
Calculation of fLIs the center frequency of the NR device using the licensed frequency band;
in formula (3)
Figure GDA0002681614180000051
Calculated from equation (11):
Figure GDA0002681614180000052
wherein the content of the first and second substances,
Figure GDA0002681614180000053
an integral term representing interference to the Wi-Fi network after mode selection,
Figure GDA0002681614180000054
for the transmission success rate impact factor of the Wi-Fi network after the mode selection in the unlicensed frequency band,
Figure GDA0002681614180000055
a position distribution probability density function for the Wi-Fi AP after mode selection;
Figure GDA0002681614180000056
calculated from equation (12):
Figure GDA0002681614180000057
wherein the content of the first and second substances,
Figure GDA0002681614180000058
an integral term representing the density of Wi-Fi APs that interfere with the Wi-Fi APs after mode selection,
Figure GDA0002681614180000059
an integral term representing the density of the gNB that interferes with the Wi-Fi AP after mode selection, y is an integral variable of the spatial distance to the gNB,
Figure GDA00026816141800000510
calculated from equation (13):
Figure GDA00026816141800000511
wherein the content of the first and second substances,
Figure GDA00026816141800000512
for an estimate of the number of successfully transmitted Wi-Fi APs after mode selection,
Figure GDA00026816141800000513
calculated according to equation (14):
Figure GDA00026816141800000514
wherein λ isuDensity, Γ, of gNB for use of unlicensed band after mode selectionedMonitoring threshold, lambda, of NR devices using unlicensed frequency bands for Wi-Fi channel sensinguBy the formula lambdau＝pλNCalculating, wherein p is the mode selection probability;
Figure GDA00026816141800000515
calculated from equation (15):
Figure GDA00026816141800000516
wherein the content of the first and second substances,
Figure GDA00026816141800000517
is an estimate of the number of Wi-Fi APs successfully transmitted after mode selection, ΓUIn order to monitor the threshold of the presence or absence of other devices when using an NR device of an unlicensed band for channel sensing,
Figure GDA00026816141800000518
calculated according to equation (16):
Figure GDA0002681614180000061
Figure GDA0002681614180000062
calculated from equation (17):
Figure GDA0002681614180000063
wherein Q isU(.) represents the probability that the transmitted gNB is interfered with, as calculated by equation (18):
Figure GDA0002681614180000064
Figure GDA0002681614180000065
calculated from equation (19):
Figure GDA0002681614180000066
wherein λ islIndicates the density of gNB using the licensed band after mode selection, λlBy the formula lambdal＝(1-p)λNAnd (3) calculating:
in formula (3)
Figure GDA0002681614180000067
Calculated from equation (20):
Figure GDA0002681614180000068
wherein the content of the first and second substances,
Figure GDA0002681614180000069
an integral term representing interference to the NR network using the unlicensed band after mode selection,
Figure GDA00026816141800000610
for the transmission success rate impact factor of the NR network using the unlicensed band after the mode selection,
Figure GDA00026816141800000611
using a gNB location distribution probability density function for the unlicensed band after mode selection; wherein the content of the first and second substances,
Figure GDA00026816141800000612
calculated from equation (21):
Figure GDA00026816141800000613
wherein the content of the first and second substances,
Figure GDA00026816141800000614
an integral term representing the density of the gNB interfering with the gNB using the unlicensed band after mode selection,
Figure GDA00026816141800000615
an integral term representing the density of Wi-Fi APs interfering with the gNB using the unlicensed band after mode selection,
Figure GDA0002681614180000071
as calculated by the equation (22),
Figure GDA0002681614180000072
calculated from equation (23):
Figure GDA0002681614180000073
Figure GDA0002681614180000074
Figure GDA0002681614180000075
calculated from equation (24):
Figure GDA0002681614180000076
Figure GDA0002681614180000077
calculated from equation (25):
Figure GDA0002681614180000078
in formula (3)
Figure GDA0002681614180000079
Calculated from equation (26):
Figure GDA00026816141800000710
wherein the content of the first and second substances,
Figure GDA00026816141800000711
an integral term representing interference to the NR network using the licensed band after mode selection,
Figure GDA00026816141800000712
using a gNB location distribution probability density function for the licensed band after mode selection; wherein the content of the first and second substances,
Figure GDA00026816141800000713
calculated from equation (27):
Figure GDA00026816141800000714
Figure GDA00026816141800000715
calculated from equation (28):
Figure GDA00026816141800000716
and 5: the central server CS sends a 'starting mode selection' signaling to all gNBs connected with the central server CS, and transmits the mode selection probability p to all gNBs connected with the current CS;
step 6: each gNB generates a random number after receiving the 'start mode selection' signaling, if the random number is less than p, sends 'use unauthorized frequency band' signaling to all the UE served by the gNB, executes step 7, otherwise sends 'use authorized frequency band' signaling to all the UE served by the gNB, and executes step 8;
and 7: after receiving the signaling of using the unlicensed frequency band, the UE sends an ACK-1 response message to the gNB serving the UE, and prepares to use fUTransmitting and receiving control and service data on the unlicensed frequency band of the center frequency, and executing step 9;
and 8: after receiving the signaling of 'using authorized frequency band', the UE sends ACK-2 response message to gNB serving the UE, and fLTransmitting and receiving control and service data for the original authorized frequency band of the center frequency, and executing step 10;
and step 9: if the gNB receives the ACK-1 response message from the UE, the message is sent at fUSending a 'mode selection completion' signaling to the UE on the frequency band of the central frequency, sending and receiving control and service data on the frequency band, and executing the step 11, otherwise, sending a 'mode selection failure' signaling to the UE by using the original authorized frequency band, sending and receiving the control and service data from the gNB serving the UE by using the original authorized frequency band, and quitting the mode selection;
step 10: if the gNB receives the ACK-2 response message from the UE, at fLSending a 'mode selection completion' signaling to the UE on an original authorized frequency band of the central frequency, and sending and receiving control and service data on the frequency band to complete mode selection;
step 11: after receiving the 'mode selection complete' signaling, the UE performs the operation at fUControl and service data are transmitted and received on the frequency band of the central frequency, and mode selection is completed;
so far, from step 1 to step 11, the unlicensed frequency band mode selection method of the 5G NR base station is completed.
Advantageous effects
Compared with the prior art, the unauthorized frequency band mode selection method of the 5G NR base station has the following beneficial effects:
1. compared with the existing unlicensed frequency band communication technology only considering the design in the unlicensed frequency band, the method considers the mode selection of two communication modes of the licensed frequency band and the unlicensed frequency band, can provide better flexibility and better SINR coverage performance, is designed based on the new technology of the next generation mobile communication network, and can be more widely applied to the future 5G communication network;
2. compared with the situation that mode selection is not carried out, the method can effectively improve the SINR coverage performance of the whole network under the scene that the 5G NR network and the Wi-Fi network coexist, and provides better communication service quality.
Drawings
Fig. 1 is a schematic system structure diagram of an unlicensed frequency band mode selection method for a 5G NR base station according to the present invention;
fig. 2 is a schematic diagram illustrating a comparison between the overall SINR coverage performance of the network without mode selection and the unlicensed frequency band mode selection method for the 5G NR base station proposed in the embodiment of the present invention under different T values;
fig. 3 is a flowchart of an unlicensed frequency band mode selection method for a 5G NR base station according to the present invention.
Detailed Description
The following describes the unlicensed frequency band mode selection method of the 5G NR base station in detail with reference to the accompanying drawings and embodiments.
Example 1
The scenario considered by the present invention is as shown in fig. 1, 1509 gbbs and 503 Wi-Fi APs are deployed in a circular area with a radius of 4000 m. The total number of base stations in the 5G NR network is M1509, where the index of the ith base station gNB is i, i 1,2, …, 1509. Each gNB serves 1 UE, i.e. the number of user terminals UE served by each gNB is N i1. All base stations of the 5G NR network are connected to one Central Server (CS). At this time lambdaW＝10-5m-2,λN＝3×10-5m-2. gNB licensed band center frequency fLFrequency band center frequency f used by Wi-Fi AP at 2.4GHzUIs 5 GHz. Each Wi-Fi AP is in a communication state. In this scenario, the Wi-Fi AP transmission power PWTransmission power P of 23dBm, gNBNMonitoring threshold gamma of Wi-Fi equipment when channel interception is carried out on Wi-Fi (23 dBm)csThreshold Γ for monitoring NR devices using unlicensed frequency bands when channel sensing is performed at-82 dBm Wi-FiedThreshold Γ for monitoring presence of other devices when using an NR device of an unlicensed band for channel sensing at-62 dBmU-82dBm, mode selection probability p 0.3, center frequency f of NR device using licensed frequency bandLCenter frequency f of NR device using unlicensed band at 2.4GHzU5CHz, 4 path loss exponent, 1 exponential fading distribution parameter mu, 0dB, sigma 20 dBm. The NR equipment comprises a 5G NR base station and a 5G mobile phoneAnd an intelligent internet access terminal.
An unauthorized frequency band mode selection method of a 5G NR base station comprises the following steps:
step 1: the UE accesses an NR network through the authorized frequency band and sends a measurement report including SINR information to a base station gNB serving the UE;
step 2: base station gNB updates UE quantity information N of authorized frequency band served by base station gNBiAnd the UE number information NiAverage SINR coverage probability with all UEs served
Figure GDA0002681614180000101
Uploading to a central server CS;
and step 3: the central server CS calculates the average SINR coverage probability of the NR network as a whole
Figure GDA0002681614180000102
And 4, step 4: the central server CS calculates a preset SINR coverage probability threshold P of the NR network according to the known parametersc-Ts0.58, and the product is judged to be
Figure GDA0002681614180000103
The size of (d); at this time
Figure GDA0002681614180000104
Executing the step 5;
and 5: the central server CS sends "start mode selection" signaling, including mode selection probability 0.3, to all the gnbs connected thereto, and executes step 6;
step 6: after receiving the 'start mode selection' signaling, the gNB generates a random number pi(ii) a At this time, there are 453 gNB pi<0.3, and sends "use unlicensed band" signaling to all UEs served by it, execute step 7, as shown in the upper half of the horizontal line in fig. 3, and the other 1056 gnbs send "use licensed band" signaling to all UEs served by it, execute step 8, as shown in the lower half of the horizontal line in fig. 3;
and 7: after receiving the signaling of using the unauthorized frequency band, the UE sends an ACK-1 response message to the gNB serving the UE, prepares to send and receive control and service data on the unauthorized frequency band with 5GHz as the center frequency, and executes step 9;
and 8: after receiving the signaling of 'using authorized frequency band', the UE sends an ACK-2 response message to the serving gNB, and sends and receives control and service data in the original authorized frequency band with 2.4GHz as the center frequency, and then executes step 10;
and step 9: 453 gNB receives ACK-1 response message from its served UE, sends 'mode selection complete' signaling to UE on the frequency band with 5GHz as center frequency, and sends and receives control and service data on the frequency band, and executes step 11;
step 10: 1056 gNB receives ACK-2 response message from UE served by it, sends 'mode selection completion' signaling to UE on original authorized frequency band with 2.4GHz as center frequency, and sends and receives control and service data on the frequency band to complete mode selection;
step 11: after receiving the 'mode selection complete' signaling, the UE performs the operation at fUControl and service data are transmitted and received on the frequency band of the central frequency, and mode selection is completed;
this completes the selection of the unlicensed band mode of the 5G NR base station.
Those skilled in the art will appreciate that the parameters are not limited to the specific assignment in the embodiment, and those skilled in the art can make the specific assignment according to the specific application scenario and the physical meaning of the parameters.
In this embodiment, the unlicensed frequency band mode selection method of the 5G NR base station proposed by the present invention can improve the SINR coverage performance of the NR network and the Wi-Fi network as a whole. As shown in fig. 2, by comparing the overall SINR coverage performance of the network without and after mode selection under different T values, it can be seen that the overall SINR coverage performance of the network after mode selection is significantly improved. This result demonstrates the effectiveness of the present method.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A method for selecting an unauthorized frequency band mode of a 5G NR base station is characterized in that: the definitions referred to are as follows:
defining the total number of base stations in a 5G NR network as M, and defining the index of an ith base station gNodeB, namely gNB as i; the number of user terminals served by gNB is denoted as NiSubscript i denotes the ith gNB;
wherein, a User Equipment (UE) is abbreviated;
wherein, the subscript j represents the jth UE, and all base stations of the 5G NR network are connected to one central server;
wherein, the Central Server, namely Central Server, is abbreviated as CS;
the mode selection method comprises the following steps:
step 1: a user terminal UE accesses a 5G NR network through an authorized frequency band and sends a measurement report to a base station gNB serving the UE;
step 2: traversing all base stations gNB, updating the number of user terminals UE served by the base stations gNB, and uploading the number of the UE and the average SINR coverage probability of all the served user terminals UE to a central server CS;
wherein, the number of user terminals served by the ith gNB is NiThe average SINR coverage probability of all user equipments UE served by the ith gNB is recorded as
Figure FDA0003130410860000011
Wherein the content of the first and second substances,
Figure FDA0003130410860000012
the average SINR coverage probability, which represents all UEs served by the ith gNB, is calculated by equation (1):
Figure FDA0003130410860000013
wherein, the SINRijSINR information representing the jth UE served by the ith gNB, T is a known SINR coverage threshold,
Figure FDA0003130410860000014
for an illustrative function, the function value is 1 when the expression in (-) is true, otherwise it is 0;
and step 3: the central server CS calculates the average SINR coverage probability of the whole 5G NR network
Figure FDA0003130410860000015
Wherein the content of the first and second substances,
Figure FDA0003130410860000016
the average SINR coverage probability representing the 5G NR network as a whole is calculated by equation (2):
Figure FDA0003130410860000021
and 4, step 4: the central server CS calculates a predetermined SINR coverage probability threshold P for the 5G NR network from the known parametersc-TsAnd judge it and
Figure FDA0003130410860000022
the magnitude relationship of (1), if
Figure FDA0003130410860000023
Then step 5 is executed; otherwise, the method is ended,
Figure FDA0003130410860000024
if not, the mode selection is executed;
wherein, Pc-TsCalculated by equation (3):
Figure FDA0003130410860000025
wherein the content of the first and second substances,
Figure FDA0003130410860000026
for an estimate of the overall SINR coverage probability of the Wi-Fi network prior to mode selection,
Figure FDA0003130410860000027
for an estimate of the overall SINR coverage probability of the Wi-Fi network after mode selection,
Figure FDA0003130410860000028
for an estimate of the overall SINR coverage probability of a 5G NR device using the unlicensed band after mode selection,
Figure FDA0003130410860000029
an estimate of the overall SINR coverage probability for a 5G NR device using the unlicensed frequency band after mode selection;
wherein the content of the first and second substances,
Figure FDA00031304108600000210
calculated from equation (4):
Figure FDA00031304108600000211
where μ is an exponential fading distribution parameter, σ2Is Gaussian white noise power, PWFor the transmission power of the Wi-Fi access point AP,
Figure FDA00031304108600000212
is a reference path loss value in an unlicensed frequency band, alpha is a path loss exponent,
Figure FDA00031304108600000213
representing selection of modesThe integral term of the first Wi-Fi network interference,
Figure FDA00031304108600000214
a transmission success rate influence factor, gamma, of the Wi-Fi network before mode selection under an unauthorized frequency bandcsMonitoring thresholds of the Wi-Fi devices while channel listening for Wi-Fi,
Figure FDA00031304108600000215
as a function of the location distribution probability density of the Wi-Fi AP, r0D is a differential sign, and is an integral variable of a position distribution probability density function of the Wi-Fi AP;
wherein the content of the first and second substances,
Figure FDA00031304108600000216
by
Figure FDA00031304108600000217
Calculation of fUC is the central frequency of the NR device using the unauthorized frequency band, c is the speed of light, and pi is a constant;
Figure FDA00031304108600000218
calculated from equation (5):
Figure FDA00031304108600000219
wherein λ isoW(x,r0) An integral term representing the density of the interfering Wi-Fi APs prior to mode selection, x being an integral variable of the spatial distance to the interfering Wi-Fi APs, θ being an integral variable of the angular orientation, λoW(x,r0) Calculating according to the formula (6):
Figure FDA0003130410860000031
wherein λ isWTo cover the density of Wi-Fi APs in an area,
Figure FDA0003130410860000032
an estimate of the number of successfully transmitted Wi-Fi APs prior to mode selection,
Figure FDA0003130410860000033
calculated according to equation (7):
Figure FDA0003130410860000034
wherein Γ () is a gamma function;
Figure FDA0003130410860000035
calculated from equation (8):
Figure FDA0003130410860000036
wherein Q isW(r0，Γcs) Represents the probability of interference experienced by a transmitting Wi-Fi AP, as calculated by equation (9):
Figure FDA0003130410860000037
wherein r is an integral variable of the spatial distance of the Wi-Fi AP interfering with transmission;
Figure FDA0003130410860000038
calculated from equation (10):
Figure FDA0003130410860000039
wherein λ isNIs the density, P, of the coverage area gNBNIs the transmission power of the gbb and,
Figure FDA00031304108600000310
for the reference path loss value in the licensed band,
Figure FDA00031304108600000311
by
Figure FDA00031304108600000312
Calculation of fLIs the center frequency of the NR device using the licensed frequency band;
in formula (3)
Figure FDA00031304108600000313
Calculated from equation (11):
Figure FDA00031304108600000314
wherein the content of the first and second substances,
Figure FDA00031304108600000315
an integral term representing interference to the Wi-Fi network after mode selection,
Figure FDA00031304108600000316
for the transmission success rate impact factor of the Wi-Fi network after the mode selection in the unlicensed frequency band,
Figure FDA00031304108600000317
a position distribution probability density function for the Wi-Fi AP after mode selection;
Figure FDA0003130410860000041
calculated from equation (12):
Figure FDA0003130410860000042
wherein the content of the first and second substances,
Figure FDA0003130410860000043
an integral term representing the density of Wi-Fi APs that interfere with the Wi-Fi APs after mode selection,
Figure FDA0003130410860000044
an integral term representing the density of the gNB that interferes with the Wi-Fi AP after mode selection, y is an integral variable of the spatial distance to the gNB,
Figure FDA0003130410860000045
calculated from equation (13):
Figure FDA0003130410860000046
wherein the content of the first and second substances,
Figure FDA0003130410860000047
for an estimate of the number of successfully transmitted Wi-Fi APs after mode selection,
Figure FDA0003130410860000048
calculated according to equation (14):
Figure FDA0003130410860000049
wherein λ isuDensity, Γ, of gNB for use of unlicensed band after mode selectionedMonitoring threshold, lambda, of NR devices using unlicensed frequency bands for Wi-Fi channel sensinguBy the formula lambdau＝pλNCalculating, wherein p is the mode selection probability;
Figure FDA00031304108600000410
calculated from equation (15):
Figure FDA00031304108600000411
wherein the content of the first and second substances,
Figure FDA00031304108600000412
is an estimate of the number of successfully transmitted gNBs after mode selection, ΓUIn order to monitor the threshold of the presence or absence of other devices when using an NR device of an unlicensed band for channel sensing,
Figure FDA00031304108600000413
calculated according to equation (16):
Figure FDA00031304108600000414
Figure FDA00031304108600000415
calculated from equation (17):
Figure FDA0003130410860000051
wherein Q isU(.) represents the probability that the transmitted gNB is interfered with, as calculated by equation (18):
Figure FDA0003130410860000052
Figure FDA0003130410860000053
calculated from equation (19):
Figure FDA0003130410860000054
wherein λ islIndicates the density of gNB using the licensed band after mode selection, λlBy the formula lambdal＝(1-p)λNAnd (3) calculating:
in formula (3)
Figure FDA0003130410860000055
Calculated from equation (20):
Figure FDA0003130410860000056
wherein the content of the first and second substances,
Figure FDA0003130410860000057
an integral term representing interference to the NR network using the unlicensed band after mode selection,
Figure FDA0003130410860000058
for the transmission success rate impact factor of the NR network using the unlicensed band after the mode selection,
Figure FDA0003130410860000059
using a gNB location distribution probability density function for the unlicensed band after mode selection; wherein the content of the first and second substances,
Figure FDA00031304108600000510
calculated from equation (21):
Figure FDA00031304108600000511
wherein the content of the first and second substances,
Figure FDA00031304108600000512
an integral term representing the density of the gNB interfering with the gNB using the unlicensed band after mode selection,
Figure FDA00031304108600000513
an integral term representing the density of Wi-Fi APs interfering with the gNB using the unlicensed band after mode selection,
Figure FDA00031304108600000514
as calculated by the equation (22),
Figure FDA00031304108600000515
calculated from equation (23):
Figure FDA00031304108600000516
Figure FDA0003130410860000061
Figure FDA0003130410860000062
calculated from equation (24):
Figure FDA0003130410860000063
Figure FDA0003130410860000064
calculated from equation (25):
Figure FDA0003130410860000065
in formula (3)
Figure FDA0003130410860000066
Calculated from equation (26):
Figure FDA0003130410860000067
wherein the content of the first and second substances,
Figure FDA0003130410860000068
an integral term representing interference to the NR network using the licensed band after mode selection,
Figure FDA0003130410860000069
using a gNB location distribution probability density function for the licensed band after mode selection; wherein the content of the first and second substances,
Figure FDA00031304108600000610
calculated from equation (27):
Figure FDA00031304108600000611
Figure FDA00031304108600000612
calculated from equation (28):
Figure FDA00031304108600000613
and 5: the central server CS sends a 'starting mode selection' signaling to all gNBs connected with the central server CS, and transmits the mode selection probability p to all gNBs connected with the current CS;
step 6: each gNB generates a random number after receiving the 'start mode selection' signaling, if the random number is less than p, sends 'use unauthorized frequency band' signaling to all the UE served by the gNB, executes step 7, otherwise sends 'use authorized frequency band' signaling to all the UE served by the gNB, and executes step 8;
and 7: after receiving the signaling of using the unlicensed frequency band, the UE sends the signaling to the gNB serving the UESending an ACK-1 response message and preparing at fUTransmitting and receiving control and service data on the unlicensed frequency band of the center frequency, and executing step 9;
and 8: after receiving the signaling of 'using authorized frequency band', the UE sends ACK-2 response message to gNB serving the UE, and fLTransmitting and receiving control and service data for the original authorized frequency band of the center frequency, and executing step 10;
and step 9: if the gNB receives the ACK-1 response message from the UE, the message is sent at fUSending a 'mode selection completion' signaling to the UE on the frequency band of the central frequency, sending and receiving control and service data on the frequency band, and executing the step 11, otherwise, sending a 'mode selection failure' signaling to the UE by using the original authorized frequency band, sending and receiving the control and service data from the gNB serving the UE by using the original authorized frequency band, and quitting the mode selection;
step 10: if the gNB receives the ACK-2 response message from the UE, at fLSending a 'mode selection completion' signaling to the UE on an original authorized frequency band of the central frequency, and sending and receiving control and service data on the frequency band to complete mode selection;
step 11: after receiving the 'mode selection complete' signaling, the UE performs the operation at fUThe mode selection is done for transmitting and receiving control and traffic data on the frequency band of the center frequency.
2. The method of claim 1, wherein the method for selecting the unlicensed frequency band mode of the 5G NR base station comprises: in step 1, the transmitted measurement report includes SINR information of the network.
3. The method of claim 1, wherein the method for selecting the unlicensed frequency band mode of the 5G NR base station comprises: the value of i ranges from 1 to M.
4. The method of claim 1, wherein the method for selecting the unlicensed frequency band mode of the 5G NR base station comprises: j ranges from 1 to Ni。
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