NR-U and WiGig coexistence network deployment method in outdoor building scene

Abstract

The invention provides an NR-U and WiGig coexistence network deployment method in an outdoor building scene. The method comprises the following steps: constructing an NR-U and WiGig coexistence network model in the outdoor building scene; calculating the channel access probabilities of the NR-U base station NBS and the WiGig base station WAP by combining the transmission probabilities of the user equipment accessing the LOS channel and the NLOS channel; according to the channel access probability, calculating a successful transmission probability of NR-U user equipment NUE and WiGig user equipment WUE; calculating throughput and spatial spectrum efficiency of the NR-U network and the WiGig network according to the successful transmission probability; and completing NR-U and WiGig coexistence network deployment based on the throughput and the spatial spectrum efficiency. According to the method, an NR-U and WiGig coexistence network model in an outdoor building scene is constructed, independent probability calculation of line-of-sight and non-line-of-sight channels under the building shielding effect is combined, the problem that in the prior art, the influence of building shielding in an actual city scene on millimeter wave signal transmission performance is ignored is solved, and large-scale coexistence network deployment can be completed conveniently.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a method for deploying a coexistence network of NR-U and WiGig in an outdoor building scenario. Background Art

[0002] With the popularization of smart phones, wearable devices and Internet of Things terminals, wireless data traffic has shown explosive growth, resulting in problems such as tight bandwidth resources and increased transmission delays in cellular networks, seriously reducing the quality of user services. Although 5G millimeter-wave communication provides rich spectrum resources through high-frequency bands, the limited nature of licensed spectrum still makes it difficult to support the continuously growing data demand in the future. To alleviate this contradiction, the communication industry has turned to unlicensed bands to expand network capacity. However, the spectrum sharing mechanism between existing cellular networks and networks such as Wi-Fi / WiGig in unlicensed bands has not been perfected, which may cause network performance conflicts.

[0003] Currently, the NR-U (New Radio Unlicensed) technology proposed by the 3GPP (the 3rd Generation Partnership Project) Rel-15 standard supports multiple unlicensed bands such as 5 GHz, 6 GHz, and 60 GHz. However, in actual deployment, bands such as 5 GHz and 6 GHz have been widely occupied by Wi-Fi networks, and the 60 GHz band is dominated by the WiGig (Wireless Gigabit) network. If a cellular network directly accesses such bands, the throughput of the coexistence system will decrease and fairness will be imbalanced due to resource competition. Although existing research has proposed coexistence solutions based on mechanisms such as channel sensing and duty cycle adjustment, they are mainly designed for open environments and do not fully consider physical layer interference factors such as building blockages commonly existing in outdoor building scenarios.

[0004] Especially in the 60 GHz millimeter-wave band, signals are easily affected by building blockages, resulting in limited network coverage and decreased link stability. However, current research on NR-U and WiGig coexistence networks is mostly based on ideal channel models, ignoring the impact of building blockages on the performance of coexistence networks, unable to ensure the performance stability of coexistence networks in complex outdoor building scenarios, and difficult to carry out large-scale coexistence network deployment. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for deploying a coexistence network of NR-U and WiGig in an outdoor building scenario, the method comprising:

[0006] Constructing a coexistence network model of NR-U and WiGig in an outdoor building scenario;

[0007] Based on the coexistence network model, calculate the channel access probability of the NR-U base station (NBS) according to the transmission probability of the NR-U user equipment (NUE) accessing the line-of-sight (LOS) channel and the transmission probability of accessing the non-line-of-sight (NLOS) channel, and calculate the channel access probability of the WiGig base station (WAP) according to the transmission probability of the WiGig user equipment (WUE) accessing the LOS channel and the transmission probability of accessing the NLOS channel;

[0008] Calculate the successful transmission probability of the NUE according to the channel access probability of the NBS, and calculate the successful transmission probability of the WUE according to the channel access probability of the WAP;

[0009] Calculate the throughput of the NR-U network and the spatial spectrum efficiency of the NR-U network according to the successful transmission probability of the NUE, and calculate the throughput of the WiGig network and the spatial spectrum efficiency of the WiGig network according to the successful transmission probability of the WUE;

[0010] Complete the deployment of the NR-U and WiGig coexistence network based on the throughput of the NR-U network, the spatial spectrum efficiency of the NR-U network, the throughput of the WiGig network, and the spatial spectrum efficiency of the WiGig network.

[0011] Preferably, the NR-U and WiGig coexistence network model in the outdoor building scenario includes:

[0012] Two types of base stations: NBS and WAP, whose positions both follow independent Poisson point processes;

[0013] Two types of user equipment: NUE and WUE, whose positions both follow independent Poisson point processes, and the density of the user equipment is greater than the density of the base stations. Each NUE is connected to the nearest NBS, and each WUE is connected to the nearest WAP;

[0014] Buildings, whose distribution range covers the base stations and the user equipment. The building position distribution follows a Boolean model, and the building density is greater than the base station density;

[0015] Channel access method. Each NBS and WAP adopts a time backoff mechanism before accessing the channel and accesses when detecting the channel is idle. And each NBS and WAP sets a signal sensing threshold to judge the range of the base station sensing area.

[0016] Preferably, the process of calculating the channel access probability of the NBS and the channel access probability of the WAP includes:

[0017] Assign a channel access metric to each NBS and WAP respectively. The channel access metric is a binary variable, which takes the value of 1 when the base station accesses the channel, otherwise it is 0;

[0018] Calculate the transmission probability of the NUE accessing the LOS channel based on the channel access metric of the NBS, the signal sensing threshold of the NBS, the transmission power of the NBS, and the path loss of the NUE accessing the LOS channel. Calculate the transmission probability of the NUE accessing the NLOS channel based on the channel access metric of the NBS, the signal sensing threshold of the NBS, the transmission power of the NBS, and the path loss of the NUE accessing the NLOS channel.

[0019] Calculate the transmission probability of the WUE accessing the LOS channel based on the channel access metric of the WAP, the signal sensing threshold of the WAP, the transmission power of the WAP, and the path loss of the WUE accessing the LOS channel. Calculate the transmission probability of the WUE accessing the NLOS channel based on the channel access metric of the WAP, the signal sensing threshold of the WAP, the transmission power of the WAP, and the path loss of the WUE accessing the NLOS channel;

[0020] Calculate the channel access probability of the NBS based on the transmission probability of the NUE accessing the LOS and the transmission probability of the NUE accessing the NLOS channel. Calculate the channel access probability of the WAP based on the transmission probability of the WUE accessing the LOS channel and the transmission probability of the WUE accessing the NLOS channel.

[0021] Preferably, the expression for calculating the channel access probability of the NBS is:

[0022]

[0023] Where is the channel access probability of the i-th NBS, is the transmission probability of the user equipment accessing the NLoS channel at the backoff time t for the i-th NBS, is the channel access metric of the i-th NBS, is the backoff time of the i-th NBS, P(NLoS) is the probability that there is a building obstruction between the base station and the user equipment, is the transmission probability of the user equipment accessing the LoS channel at the backoff time t for the i-th NBS, P(LOS) is the probability that there is no building obstruction between the base station and the user equipment;

[0024] The expression for calculating the channel access probability of the WAP is:

[0025]

[0026] Where is the channel access probability of the j-th WAP, is the transmission probability of the user equipment accessing the NLoS channel at the backoff time t for the j-th WAP, is the channel access metric of the j-th WAP, is the backoff time of the j-th WAP, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the j-th WAP is t.

[0027] Preferably, the process of calculating the successful transmission probability of the NUE and the successful transmission probability of the WUE includes:

[0028] Calculating the signal-to-interference ratio of the NUE according to the interference formed by the NBS and WAP whose access channels are reserved on the NBS to which the NUE is connected, and calculating the signal-to-interference ratio of the WUE according to the interference formed by the NBS and WAP whose access channels are reserved on the WAP to which the WUE is connected;

[0029] Calculating the successful transmission probability of the NUE according to the Nakagami-m fading model, the signal-to-interference ratio of the NUE, and the channel access probability of the NUS, and calculating the successful transmission probability of the WUE according to the Nakagami-m fading model, the signal-to-interference ratio of the WUE, and the channel access probability of the WAP.

[0030] Preferably, the expression for calculating the signal-to-interference ratio of the NUE is:

[0031]

[0032] where SIR N is the signal-to-interference ratio of the NUE, l(||x0||) is the path loss between the NUE x0 and the NBS to which it is connected, is the interference formed by the NBS whose access channel is reserved on the NBS to which the NUE is connected, is the interference formed by the WAP whose access channel is reserved on the NBS to which the NUE is connected, P N is the transmission power of the NBS, is the small-scale fading of the channel between the NUE and the NBS to which it is connected;

[0033] The expression for calculating the signal-to-interference ratio of the WUE is:

[0034]

[0035] where SIR W is the signal-to-interference ratio of the WUE, l(||y0||) is the path loss between the WUE y0 and the WAP to which it is connected, is the interference formed by the NBS whose access channel is reserved on the WAP to which the WUE is connected, is the interference formed by the WAP whose access channel is reserved on the WAP to which the WUE is connected, P W is the transmission power of the WAP, is the small-scale fading of the channel between the WUE and the WAP to which it is connected.

[0036] Preferably, the expression for calculating the successful transmission probability of the NUE is:

[0037]

[0038] Among them, is the successful transmission probability of NUE, is the channel access probability of NBS under the LOS channel, is the channel access probability of NBS under the NLOS channel, ζ N(LOS) is the LOS coverage probability of NUE, ζ N(NLOS) is the NLOS coverage probability of NUE, P(LOS) is the probability that there is no building obstruction between the base station and the user equipment, and P(NLOS) is the probability that there is a building obstruction between the base station and the user equipment;

[0039] The expression for calculating the successful transmission probability of WUE is:

[0040]

[0041] Among them, is the successful transmission probability of WUE, is the channel access probability of WAP under the LOS channel, is the channel access probability of WAP under the NLOS channel, ζ W(LOS) is the LOS coverage probability of WUE, ζ W(NLOS) is the NLOS coverage probability of WUE.

[0042] Preferably, the expressions for calculating the throughput of the NR-U network and the spatial spectral efficiency of the NR-U network are:

[0043]

[0044] Among them, V N is the throughput of the NR-U network, B is the bandwidth, T N is the signal-to-interference ratio threshold of NUE, is the successful transmission probability of NUE, C N is the spatial spectral efficiency of the NR-U network, λ N is the density of NBS,;

[0045] The expressions for calculating the throughput of the WiGig network and the spatial spectral efficiency of the WiGig network are:

[0046]

[0047] Among them, V W is the throughput of the WiGig network, T W is the signal-to-interference ratio threshold of WUE, is the successful transmission probability of WUE, C wFor the spatial spectral efficiency of the WiGig network, λ W is the density of the WAPs.

[0048] Preferably, in the coexistence network model, the base station uses directional antennas to transmit data, and the directional antennas are adaptive antennas.

[0049] Advantages of the present invention:

[0050] The present invention proposes a method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario. The method constructs an NR-U and WiGig coexistence network model in the outdoor building scenario, calculates the successful transmission probability of user equipment by combining the independent probabilities of line-of-sight and non-line-of-sight channels under the building occlusion effect, analyzes the throughput and spatial spectral efficiency of the NR-U network and the WiGig network, and solves the problem that the prior art ignores the influence of building occlusion on the transmission performance of millimeter-wave signals in the actual urban environment. The method can quantitatively analyze the influence of the deployment density, transmission power, and signal sensing threshold of the base station on the network performance, provide a theoretical basis and optimization guidance for the coexistence deployment of the NR-U and WiGig networks in the outdoor high-density building scenario, improve the efficiency and reliability of network planning, and is applicable to the actual deployment requirements in complex environments of cities and large towns. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following introduces the related technical solution drawings of the embodiments of the present invention. It should be understood that the drawings in the following introduction are only for conveniently and clearly expressing some embodiments of the technical solutions in the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0052] Figure 1 is a schematic flowchart of a method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario provided in an embodiment of the present invention;

[0053] Figure 2 is a schematic diagram of the model structure of an NR-U and WiGig coexistence network in an outdoor building scenario provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention. For the step numbers in the following embodiments, they are only set for the convenience of explanation and description, and no limitation is made on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0055] The embodiment of the present invention provides a method for deploying a coexistence network of NR-U and WiGig in an outdoor building scenario. The method flow is as Figure 1 shown.

[0056] In the embodiment of the present invention, in the 60GHz frequency band, a coexistence network model of NR-U and WiGig in an outdoor building scenario is constructed. The model structure is as Figure 2 shown. The positions of the NR-U base stations (NBS) and the WiGig access points (WAP) respectively follow independent Poisson point processes. Before accessing an idle channel, each NBS and WAP adopts a time backoff mechanism and will wait for a certain time before transmitting data. It will access the channel for data transmission only when the channel is detected to be idle. Each NBS and WAP has a signal sensing threshold. When the received signal energy is greater than this threshold, the signal can be detected by the base station. Otherwise, the signal will not interfere with the base station. The size of the signal sensing threshold determines the range of the base station sensing area.

[0057] The embodiment of the present invention divides the user equipment into two independent groups: NR-U user equipment (NUE) and WiGig user equipment (WUE). Each NUE is connected to the nearest NBS, and each WUE is connected to the nearest WAP. The position distributions of NUE and WUE also respectively follow independent Poisson point processes. The probability density function of the distance between the user equipment and the nearest base station is:

[0058]

[0059] where is the probability density function of the distance between the user equipment η and the nearest base station, λ η is the density of the base station corresponding to the user equipment η, is the distance between the user equipment η and the nearest corresponding base station, and η ∈ {N, W} respectively represent NUE and WUE.

[0060] In the embodiments of the present invention, since the millimeter-wave frequency band has characteristics such as severe path loss and short transmission distance, both the NR-U base station and the WiGig base station use directional antennas to transmit data to improve antenna gain, and can achieve a longer transmission distance in the millimeter-wave frequency band. The directional antenna adopts a three-dimensional cone-plus-sphere model, and when all base stations are in the same plane in the two-dimensional space, it can also be directly applied to the two-dimensional scenario.

[0061] In the embodiments of the present invention, because the signal transmission of the directional antenna has directivity and beam width, the directional antenna cannot connect to all adjacent nodes in the coexisting network. Therefore, an adaptive antenna array is adopted to make the main lobe of the directional antenna intelligently face the direction of the target signal through beamforming technology. The directional antenna consists of a main lobe with a beam width of θ ξ and a side lobe with a beam width of 2π - θ ξ . When the directional antenna adopts uniform gain, the antenna gains of NBS and WAP are:

[0062]

[0063] where G ξ (θ ij ) is the antenna gain of base station ξ, θ ij is the angle formed between the signal transmitter and the signal receiver and the signal transmission direction, M ξ is the main lobe gain of base station ξ, S ξ is the side lobe gain of base station ξ, θ ξ is the beam width of the main lobe of base station ξ, and ξ ∈ {N, W} respectively represent NBS and WAP.

[0064] In the embodiments of the present invention, the following relationship is satisfied between the main lobe gain M ξ and the side lobe gain S ξ :

[0065]

[0066] where θ ξ is the beam width of the main lobe, and 2π - θ ξ is the beam width of the side lobe.

[0067] In the embodiments of the present invention, the NR-U base station mainly adopts a directional listening mechanism or a paired listening mechanism to coexist fairly with the WiGig base station to ensure the performance of the coexisting network in the 60GHz frequency band. The NR-U base station uses an antenna with a listening direction pointing to the user equipment connected to the base station and a listening width of θ dir to sense the energy magnitude of the signal transmitted on the unlicensed frequency band channel. When the NR-U base station adopts the directional listening mechanism, the gain of the antenna receiving the signal is:

[0068]

[0069] Among them, J(θ ij ) is the gain of the antenna receiving signal, M D is the main lobe gain of the directional listening, S D is the side lobe gain of the directional listening, θ dir is the listening width.

[0070] In the omniLBT and dirLBT mechanisms of the embodiments of the present invention, random backoff with a contention window is adopted. A backoff timer is used in each NBS and WAP to determine the period that the NBS or WAP should wait before transmitting on the idle UC. The backoff timer follows a uniform distribution within the range of [0, 1]. The signal sensing thresholds of the NBS and WAP are represented by β N and β W respectively, and they determine the sensing range of the base station. Therefore, the channel access of the NBS and WAP can be described as follows: If the backoff time of a specific NBS or WAP is the smallest among all NBSs and WAPs, then the specific NBS or WAP will be granted transmission. In addition, if the power received from the NBS and WAP with a smaller backoff timer is less than its sensing threshold, the NBS or WAP will be granted transmission. A channel access metric is assigned to each NBS or WAP. If the NBS or WAP is authorized to transmit, the metric is configured to 1, otherwise it is configured to 0. The channel access metrics of the NBS and WAP are represented as follows:

[0071]

[0072] Among them, is the channel access metric of the i-th NBS, is the channel access metric of the j-th WAP, y j is the j-th WAP, Φ W is the set of WAPs, x i is the i-th NBS, Φ N is the set of NBSs, l||y j -x i || is the path loss between y j and x i , l||x i -y j || is the path loss between x i and y j , l||x k -x i || is the path loss between y k and x i , l||y k -y j || is the path loss between yk The path loss with respect to y j is the backoff timer for y The backoff timer for y j is the backoff timer for y The backoff timer for x i is the backoff timer for x The backoff timer for y k is the backoff timer for y The backoff timer for x k is the backoff timer for x The backoff timer for y j and the small-scale fading of the connection between y and the NUE associated with x i is the small-scale fading of the connection between x and the NUE associated with x The small-scale fading of the connection between x and the NUE associated with x i and the small-scale fading of the connection between y and the WUE associated with y j is the small-scale fading of the connection between y and the WUE associated with y The small-scale fading of the connection between x and the NUE associated with x k and the small-scale fading of the connection between y and the WUE associated with y, β i is the signal sensing threshold of the NBS, β The signal sensing threshold of the WAP, P k is the transmission power of the NBS, P j is the transmission power of the WAP, x N is the k-th NBS, y W is the k-th WAP, G N (θ W ) is the antenna gain of y k The antenna gain of y k is the antenna gain of x W (θ ji ) is the antenna gain of x j The antenna gain of x N (θ ki ) is the antenna gain of x k The antenna gain of x N (θ ij ) is the antenna gain of y i The antenna gain of y W (θ kj ) is the antenna gain of y k The gain of the antenna receiving the signal of y, J(θ ji ) is the gain of the antenna receiving the signal of y j The gain of the antenna receiving the signal of x, J(θ ij ) is the gain of the antenna receiving the signal of x i The gain of the antenna receiving the signal of x ki ) is the gain of the antenna receiving the signal of x k The gain of the antenna receiving the signal of y kj ) is the gain of the antenna receiving the signal of y k is the gain of the antenna receiving the signal.

[0073] The embodiments of the present invention consider two signal transmission paths. One is the LOS path without obstruction between the base station and the user, and the other is the NLOS path that is reflected to the user (the signal cannot pass through the building and can be reflected). The probability that there is no building obstruction between the base station and the user equipment is P(LoS) = 1 - exp(-λπS(x)x 2 ), where: λ is the density of the base station, x is the distance from the base station to the user equipment, L is the length of the building, and μ is the density of the building. The probability that there is building obstruction between the base station and the user equipment is P(NLoS) = 1 - P(LoS).

[0074] According to the signal sensing thresholds and transmission powers of NBS and WAP in the embodiments of the present invention, since the positions of NBS and WAP follow independent Poisson point processes, the transmission probabilities of the user equipment accessing the LOS channel and the NLOS channel can be obtained through the probability generating function (PGFL). The expressions for calculating the transmission probabilities of the user equipment accessing the LOS channel and the NLOS channel when the j-th NBS has a backoff time of t are respectively:

[0075]

[0076] Among them, is the transmission probability of the user equipment accessing the NLoS channel when the i-th NBS has a backoff time of t, is the transmission probability of the user equipment accessing the LoS channel when the i-th NBS has a backoff time of t, Γ ed is the signal sensing threshold of NBS, Γ cs is the signal sensing threshold of WAP, P N is the transmission power of NBS, P W is the transmission power of WAP, μ is the density of the building, y j is the j-th WAP, Φ W is the set of WAPs, x i is the i-th NBS, Φ N is the set of NBSs, t is the backoff time, G N (θ ij ) is the antenna gain of x i , G W (θ ij ) is the antenna gain of y j , l′(r) is the path loss of the LOS channel, and l″(r) is the path loss of the NLOS channel;

[0077] The expressions for the transmission probabilities of the user equipment accessing the LOS channel and the NLOS channel when the j-th WAP has a backoff time of t are:

[0078]

[0079] Among them, is the transmission probability of the user equipment accessing the NLoS channel when the backoff time of the j-th WAP is t, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the j-th WAP is t.

[0080] In the embodiment of the present invention, the channel access probability of the base station is a key parameter for obtaining the successful transmission probability, throughput, and spatial spectrum efficiency of the coexisting network. t follows a uniform distribution within [0, 1]. According to the transmission probability of the NUE accessing the LOS and the transmission probability of the NUE accessing the NLOS channel, the expression for calculating the channel access probability of the NBS is:

[0081]

[0082] Among them, is the channel access probability of the i-th NBS, is the transmission probability of the user equipment accessing the NLoS channel when the backoff time of the i-th NBS is t, is the channel access metric of the i-th NBS, is the backoff time of the i-th NBS, P(NLoS) is the probability that there is a building obstruction between the base station and the user equipment, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the i-th NBS is t, and P(LOS) is the probability that there is no building obstruction between the base station and the user equipment;

[0083] According to the transmission probability of the WUE accessing the LoS channel and the transmission probability of the WUE accessing the NLOS channel, the expression for calculating the channel access probability of the WAP is:

[0084]

[0085] Among them, is the channel access probability of the j-th WAP, is the transmission probability of the user equipment accessing the NLoS channel when the backoff time of the j-th WAP is t, is the channel access metric of the j-th WAP, is the backoff time of the j-th WAP, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the j-th WAP is t.

[0086] In the embodiment of the present invention, according to the interference caused by the NBS and WAP to which the access channel is reserved to the NBS connected by the NUE, the expression for calculating the signal-to-interference ratio of the NUE is:

[0087]

[0088] wherein, SIR N is the signal-to-interference ratio of the NUE, l(||x0||) is the path loss between the user equipment x0 and the base station to which it is connected, is the interference caused by the NBS with the access channel reserved to the NBS to which the NUE is connected, is the interference caused by the WAP with the access channel reserved to the NBS to which the NUE is connected, P N is the transmission power of the NBS, is the small-scale fading of the channel between the NUE and the NBS to which it is connected, is the first parameter, is the second parameter;

[0089] According to the interference caused by the NBS and WAP with the access channel reserved to the WAP to which the WUE is connected, the expression for calculating the signal-to-interference ratio of the WUE is:

[0090]

[0091] wherein, SIR W is the signal-to-interference ratio of the WUE, l(||y0||) is the path loss between the user equipment y0 and the base station to which it is connected, is the interference caused by the NBS with the access channel reserved to the WAP to which the WUE is connected, is the interference caused by the WAP with the access channel reserved to the WAP to which the WUE is connected, P W is the transmission power of the WAP, is the small-scale fading of the channel between the WUE and the WAP to which it is connected, is the third parameter, is the fourth parameter.

[0092] The calculation expressions of the parameters and in the embodiments of the present invention are respectively:

[0093]

[0094] wherein, is the aggregated interference power from the reserved NBS to the NUE, is the aggregated interference power of the reserved NBS and the WUE, is the aggregated interference power from the reserved WAP to the NUE, is the aggregated interference power from the reserved WAP to the WUE, P N is the transmission power of the NBS, P W is the transmission power of the WAP, l(||x i ||) is the user equipment x iThe path loss between it and the connected base station, l(||y j ||) is for the user equipment y j The path loss between it and the connected base station, G N (θ ij ) is for x i 's antenna gain, G W (θ ij ) is for y j 's antenna gain, y j is the j-th WAP, x i is the i-th NBS, Φ N is the NBS set, Φ W is the WAP set, is the small-scale fading of the channel between the NBS and NUE for which the access channel is reserved, is the small-scale fading of the channel between the NBS and WUE for which the access channel is reserved, is the small-scale fading of the channel between the WAP and NUE for which the access channel is reserved, is the small-scale fading of the channel between the WAP and NUE for which the access channel is reserved.

[0095] In the embodiment of the present invention, in the downlink, the expression for the typical user successful transmission probability (i.e., the probability that the signal-to-interference ratio is greater than a certain threshold on the basis that the base station to which the user is linked is reserved) is:

[0096]

[0097] Among them, is the successful transmission probability of η, T η is the signal-to-interference ratio threshold of η, is the signal-to-interference ratio of η, P(e η =1) is the channel access probability of the base station corresponding to η, e η is the channel access metric of the base station to which η is linked, E represents the expectation operation, and η∈{N,W} respectively represent NUE and WUE.

[0098] In the embodiment of the present invention can be represented according to h following the Nakagami-m fading model as Among them, h represents the channel. By using PGFL for derivation and simplification, the expression for calculating the successful transmission probability of NUE is obtained as:

[0099]

[0100] Among them, is the successful transmission probability of NUE, is the channel access probability of NBS under the LOS channel, is the channel access probability of NBS in the NLOS channel, ζ N(LOS) is the LOS coverage probability of NUE, ζ N(NLOS) is the NLOS coverage probability of NUE, P(LOS) is the probability that there is no building obstruction between the base station and the user equipment, and P(NLOS) is the probability that there is a building obstruction between the base station and the user equipment;

[0101] The expression for calculating the successful transmission probability of WUE is:

[0102]

[0103] where, is the successful transmission probability of WUE, is the channel access probability of WAP in the LOS channel, is the channel access probability of WAP in the NLOS channel, ζ W(LOS) is the LOS coverage probability of WUE, ζ W(NLOS) is the NLOS coverage probability of WUE.

[0104] In the embodiments of the present invention The expression for the channel access probability of NBS in the NLOS channel is:

[0105]

[0106] where, respectively represent the antenna gains in different cases, β N is the signal sensing threshold of NBS, β W is the signal sensing threshold of WAP, λ N is the density of NBS, λ W is the density of WAP, r is the distance between the user equipment and the base station, and l″(r) is the path loss of the NLOS channel.

[0107] The expression for the channel access probability of NBS in the LOS channel is:

[0108]

[0109] where, where, respectively represent the antenna gains in different cases, β N is the signal sensing threshold of NBS, β W is the signal sensing threshold of WAP, λ N is the density of NBS, λ W is the density of WAP, r is the distance between the user equipment and the base station, and l′(r) is the path loss of the LOS channel.

[0110] The coverage probability ζ of LOS in the embodiments of the present invention N(LOS) and the coverage probability ζ of NLOS N(NLOS) are expressed as:

[0111]

[0112] where m is the fading factor of the Nakagami-m fading model (when m = 1, it is close to Rayleigh fading, applicable to the NLOS case; when m > 1, the signal fading is reduced, close to Rice fading, applicable to the LOS case), P(LOS) is the probability that there is no building obstruction between the base station and the user equipment, and P(NLOS) is the probability that there is a building obstruction between the base station and the user equipment.

[0113] In the embodiments of the present invention, through the complementary cumulative distribution function (CCDF) of the gamma distribution and the stochastic process tool, and L Z (s) can be obtained:

[0114]

[0115]

[0116] where m is the fading factor of the Nakagami-m fading model, λ N(NLOS) is the NBS density under NLOS, λ N(LOS) is the NBS density under LOS, λ W(NLOS) is the WAP density under NLOS, λ W(LOS) is the WAP density under LOS, θ N is the wave velocity width of the main lobe of the NBS, θ W is the wave velocity width of the main lobe of the WAP, P N is the transmission power of the NBS, P W is the transmission power of the WAP, r is the path loss between the user equipment and the base station, l(||x i ||) is the path loss between the user equipment x i and the base station it is connected to, l(||y j ||) is the path loss between the user equipment y j and the base station it is connected to, T N is the signal-to-interference ratio threshold of the NUE, M N is the main lobe gain of the NBS, M W is the main lobe gain of the WAP, S N is the side lobe gain of the NBS, S W is the side lobe gain of the WAP, is the expression of the channel access probability of the NBS in the LOS channel, It is the expression of the channel access probability of the WAP in the NLOS channel.

[0117] In the embodiment of the present invention, according to the successful transmission probabilities of the NUE and the WUE, the expressions for calculating the throughput of the NR-U network and the spatial spectral efficiency of the NR-U network are:

[0118]

[0119] Among them, V N is the throughput of the NR-U network, B is the bandwidth, and T N is the signal-to-interference-plus-noise ratio threshold of the NUE, is the successful transmission probability of the NUE, C N is the spatial spectral efficiency of the NR-U network, and λ N is the density of the NBS;

[0120] The expressions for calculating the throughput of the WiGig network and the spatial spectral efficiency of the WiGig network are:

[0121]

[0122]

[0123] Among them, V W is the throughput of the WiGig network, B is the bandwidth, and T W is the signal-to-interference-plus-noise ratio threshold of the WUE, is the successful transmission probability of the WUE, C w is the spatial spectral efficiency of the WiGig network, and λ W is the density of the WAP.

[0124] In summary, the present invention effectively solves the problem of the lack of modeling of the influence of building occlusion on the millimeter-wave signal transmission performance in the real urban environment by introducing the calculation of the independent probabilities of the LOS and NLOS channels under the building occlusion effect. According to the throughput characteristics and spatial spectral efficiency indicators of the NR-U network and the throughput characteristics and spatial spectral efficiency indicators of the WiGig network, the deployment density, transmission power, and signal sensing threshold of the NBS and the deployment density, transmission power, and signal sensing threshold of the WAP are adjusted, and a more optimal solution is selected in combination with the actual application scenario to complete the deployment of the large-scale coexisting network.

[0125] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to the embodiments of the present invention without departing from the principles and spirits of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario, characterized in that, Including the following steps: Construct a coexistence network model of NR-U and WiGig in an outdoor building scenario; Based on the coexistence network model, calculate the channel access probability of the NR-U base station (NBS) according to the transmission probability of the NR-U user equipment (NUE) accessing the line-of-sight (LOS) channel and the transmission probability of accessing the non-line-of-sight (NLOS) channel, and calculate the channel access probability of the WiGig base station (WAP) according to the transmission probability of the WiGig user equipment (WUE) accessing the LOS channel and the transmission probability of accessing the NLOS channel; Calculate the successful transmission probability of the NUE according to the channel access probability of the NBS, and calculate the successful transmission probability of the WUE according to the channel access probability of the WAP; Calculate the throughput of the NR-U network and the spatial spectrum efficiency of the NR-U network according to the successful transmission probability of the NUE, and calculate the throughput of the WiGig network and the spatial spectrum efficiency of the WiGig network according to the successful transmission probability of the WUE; Complete the deployment of the coexistence network of NR-U and WiGig based on the throughput of the NR-U network, the spatial spectrum efficiency of the NR-U network, the throughput of the WiGig network, and the spatial spectrum efficiency of the WiGig network.

2. The method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 1, wherein The coexistence network model of NR-U and WiGig in an outdoor building scenario includes: Two types of base stations: NBS and WAP, whose positions both follow independent Poisson point processes; Two types of user equipment: NUE and WUE, whose positions both follow independent Poisson point processes, and the density of user equipment is greater than the density of base stations. Each NUE is connected to the nearest NBS, and each WUE is connected to the nearest WAP; Buildings, whose distribution range covers the base stations and user equipment. The building position distribution follows a Boolean model, and the building density is greater than the density of base stations; Channel access method. Each NBS and WAP adopts a time backoff mechanism before accessing the channel and accesses when detecting the channel is idle. And each NBS and WAP sets a signal sensing threshold to determine the range of the base station sensing area.

3. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 1, characterized in that The process of calculating the channel access probability of the NBS and the channel access probability of the WAP includes: Assign a channel access metric to each NBS and WAP respectively. The channel access metric is a binary variable, taking the value of 1 when the base station accesses the channel, otherwise 0; Calculate the transmission probability of the NUE accessing the LOS channel according to the channel access metric of the NBS, the signal sensing threshold of the NBS, the transmission power of the NBS, and the path loss of the NUE accessing the LOS channel. Calculate the transmission probability of the NUE accessing the NLOS channel according to the channel access metric of the NBS, the signal sensing threshold of the NBS, the transmission power of the NBS, and the path loss of the NUE accessing the NLOS channel. Calculate the transmission probability of the WUE accessing the LOS channel according to the channel access metric of the WAP, the signal sensing threshold of the WAP, the transmission power of the WAP, and the path loss of the WUE accessing the LOS channel. Calculate the transmission probability of the WUE accessing the NLOS channel according to the channel access metric of the WAP, the signal sensing threshold of the WAP, the transmission power of the WAP, and the path loss of the WUE accessing the NLOS channel; Calculate the channel access probability of the NBS according to the transmission probability of the NUE accessing the LOS and the transmission probability of the NUE accessing the NLOS channel, and calculate the channel access probability of the WAP according to the transmission probability of the WUE accessing the LOS channel and the transmission probability of the WUE accessing the NLOS channel.

4. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 3, characterized in that The expression for calculating the channel access probability of the NBS is: wherein, is the channel access probability of the i-th NBS, is the transmission probability of the user equipment accessing the NLoS channel when the backoff time of the i-th NBS is t, is the channel access metric of the i-th NBS, is the backoff time of the i-th NBS, and P(NLoS) is the probability that there is a building obstruction between the base station and the user equipment, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the i-th NBS is t, and P(LOS) is the probability that there is no building obstruction between the base station and the user equipment; The expression for calculating the channel access probability of the WAP is: Among them, is the channel access probability of the j-th WAP, is the transmission probability of the user equipment accessing the NLoS channel when the backoff time of the j-th WAP is t, is the channel access metric of the j-th WAP, is the backoff time of the j-th WAP, is the transmission probability of the user equipment accessing the LoS channel when the backoff time of the j-th WAP is t.

5. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 1, characterized in that The process of calculating the successful transmission probability of the NUE and the successful transmission probability of the WUE includes: Calculate the signal-to-interference ratio of the NUE according to the interference caused by the NBS and WAP whose access channels are reserved to the NBS connected by the NUE, and calculate the signal-to-interference ratio of the WUE according to the interference caused by the NBS and WAP whose access channels are reserved to the WAP connected by the WUE; Calculate the successful transmission probability of the NUE according to the Nakagami-m fading model, the signal-to-interference ratio of the NUE and the channel access probability of the NUS, and calculate the successful transmission probability of the WUE according to the Nakagami-m fading model, the signal-to-interference ratio of the WUE and the channel access probability of the WAP.

6. The method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 5, wherein The expression for calculating the signal-to-interference ratio of the NUE is: Among them, SIR N is the signal-to-interference ratio of the NUE, and l(||x0||) is the path loss between the NUEx0 and the NBS to which it is connected. is the interference formed by the NBS with the access channel reserved for the NBS to which the NUE is connected. is the interference formed by the WAP with the access channel reserved for the NBS to which the NUE is connected. P N is the transmission power of the NBS. is the small-scale fading of the channel between the NUE and the NBS to which it is connected. The expression for calculating the signal-to-interference ratio of the WUE is: Among them, SIR W is the signal-to-interference ratio of WUE, and l(||y0||) is the path loss between WUE y0 and the WAP it is connected to. is the interference caused by the NBS whose access channel is reserved to the WAP connected to the WUE. is the interference caused by the WAP whose access channel is reserved to the WAP connected to the WUE, and P W is the transmission power of the WAP. is the small-scale fading of the channel between the WUE and the WAP it is connected to.

7. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 5, characterized in that, The expression for calculating the successful transmission probability of the NUE is: Among them, is the successful transmission probability of NUE, is the channel access probability of NBS under the LOS channel, is the channel access probability of NBS under the NLOS channel, is the LOS coverage probability of NUE, is the NLOS coverage probability of NUE, P(LOS) is the probability that there is no building obstruction between the base station and the user equipment, and P(NLOS) is the probability that there is a building obstruction between the base station and the user equipment; The expression for calculating the successful transmission probability of the WUE is: wherein, is the successful transmission probability of WUE, is the channel access probability of WAP under LOS channels, is the channel access probability of WAP under NLOS channels, is the LOS coverage probability of WUE, is the NLOS coverage probability of WUE.

8. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 1, characterized in that The expressions for calculating the throughput of the NR-U network and the spatial spectral efficiency of the NR-U network are: Among them, V N is the throughput of the NR-U network, B is the bandwidth, T N is the signal-to-interference ratio threshold of the NUE, is the successful transmission probability of the NUE, C N is the spatial spectral efficiency of the NR-U network, λ n is the density of the NBS; The expressions for calculating the throughput of the WiGig network and the spatial spectral efficiency of the WiGig network are: Among them, V W is the throughput of the WiGig network, T W is the signal-to-interference ratio threshold of the WUE, is the successful transmission probability of the WUE, C w is the spatial spectrum efficiency of the WiGig network, λ W is the density of the WAP.

9. A method for deploying an NR-U and WiGig coexistence network in an outdoor building scenario according to claim 1, characterized in that In the coexistence network model, the base station uses a directional antenna to transmit data, and the directional antenna is an adaptive antenna.

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