Cache enabling user association method suitable for heterogeneous communication network

A communication network and user technology, applied in wireless communication, network planning, network traffic/resource management, etc., can solve the problems of inability to fully consider transmission performance, easy implementation and low cost, etc., to achieve easy implementation, improve network efficiency, and low cost Effect

Active Publication Date: 2021-08-17
SOUTHEAST UNIV
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a caching-enabled user association method suitable for heterogeneous communication networks, so as t...
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Method used

[0057] FIG. 3 shows a graph showing the relationship between cache placement parameters and successful transmission probability in the embodiment of the present invention, wherein it represents the probability associated with the sub-6G base station when it has nothing to do with the cache, and is negatively correlated with the density λ2 of the millimeter wave base station . It can be seen from th...
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Abstract

The invention discloses a cache enabling user association method suitable for a heterogeneous communication network, and the method comprises the following steps: a millimeter wave base station caches the most popular content, and a sub-6G base station caches a part of the most popular content and a part of the most popular content except the cached content of the millimeter wave base station. When the two base stations cache the content required by the user, the user firstly associates to the millimeter wave base station which meets the signal-to-noise ratio condition and has the strongest signal, otherwise, a plurality of sub-6G base stations with the strongest signal perform joint transmission; when only the sub-6G base station caches the content required by the user, a plurality of sub-6G base stations with the strongest signals carry out joint transmission; and in other cases, the sub-6G base station with the strongest signal retrieves the content from the central server through the optical fiber and transmits the content to the user. According to the method, caching and joint transmission technologies are combined, and the optimal design of related parameters is provided, so that the network performance is effectively improved.

Application Domain

Technology Topic

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  • Cache enabling user association method suitable for heterogeneous communication network
  • Cache enabling user association method suitable for heterogeneous communication network
  • Cache enabling user association method suitable for heterogeneous communication network

Examples

  • Experimental program(1)

Example Embodiment

[0034] In order to better understand the purpose, structure and function of the present invention, a cache-enabled user association method suitable for heterogeneous communication networks of the present invention will be described in further detail below with reference to the accompanying drawings.
[0035] For the heterogeneous wireless communication network operating in the sub-6G and millimeter-wave frequency bands, the Poisson point process of the two-dimensional plane is used to model the positions of the sub-6G and millimeter-wave base stations, respectively, and their densities are denoted by λ 1 and λ 2 Representation, assuming that a user is located at the origin of the coordinates (according to the correlation theorem of random geometry, the user can represent any user), the central server and the sub-6G base station are connected by optical fibers, and the content of the entire system is divided into a total number of J and the same size of sub- content. Assume that the content popularity obeys the Zipf distribution and uses Represents the content popularity, where the subscript j represents the content serial number, and satisfies j∈{1,...,J}, ζ represents the coefficient of Zipf distribution, j represents the content serial number, and the smaller the j is, the more popular the content is. The cache-enabled user association method suitable for heterogeneous communication networks is as follows: figure 1 As shown, the scheme includes the following steps:
[0036] Step 1: All base stations deploy memory, and cache the most popular J in each millimeter-wave base station according to the popularity of the content 2 content, cache the most popular J in each sub-6G base station o content and popularity from J 2 +1 to J 2 +J 1 -J o the content of which J 1 Indicates the number of contents buffered by the sub-6G base station. Generally, J, J 1 and J 2 Depending on the actual hardware system, J o The content storage mechanism is obtained from step 6 and determined.
[0037]Step 2: The user sends a request to the surrounding base stations according to the content required by the user, and determines the type of the base station that caches the required content. When the user requests the content number J * ∈{1,…,J 2}, the millimeter-wave base station caches the content requested by the user; when J * ∈{1,…,J o}∪{J 2 +1,…,J 1 +J 2 -J o} Then the sub-6G base station caches the content requested by the user.
[0038] Step 3: If the millimeter-wave base station caches the content required by the user and the maximum path loss gain with the user is greater than the given threshold S 0 , the user is associated with the millimeter-wave base station with the largest path loss gain, and the base station adjusts the antenna direction so that the user obtains the main lobe antenna gain. The received signal-to-interference-noise ratio of the user associated with the mmWave base station with the maximum received signal power can be expressed as
[0039]
[0040] where P 2 Indicates the transmit power of the millimeter-wave base station, h 2,0 Represents the small-scale fading channel coefficient between the associated base station and the user and obeys the Nakagami distribution. For the line-of-sight link and the non-line-of-sight link, there are parameters m respectively L and m N , Mainlobe antenna gain, N 2 is the received noise power of the user, r 0 Indicates the distance from the millimeter-wave base station providing the service to the user, L 2 (r) represents the path loss gain, for line-of-sight links and non-line-of-sight links, L 2 (r) are expressed as and where a L and α N are the path loss fading coefficients for line-of-sight links and non-line-of-sight links, respectively. Interference caused by other millimeter-wave base stations around the user, where n 2 Indicates the number of other millimeter-wave base stations, h 2,i Represents the small-scale fading coefficients between the remaining i-th base station and the user and obeys the Nakagami distribution. For the line-of-sight link and the non-line-of-sight link, there are parameters m respectively L and m N. G i represents the antenna gain and can be modeled as
[0041]
[0042] where θ and θ 2 represent the departure angle and main lobe width of the millimeter-wave base station antenna, respectively, is the corresponding side lobe gain. In addition, assuming that a link is line-of-sight and non-line-of-sight related to distance, the line-of-sight link and non-line-of-sight probabilities are denoted as p, respectively L =e -βr and p N =1-e -βr , where β is a parameter related to obstacles in the link. When all the millimeter-wave base stations do not meet the conditions, the K sub-6G base stations closest to the user (that is, with the strongest signal) use a joint transmission strategy to transmit signals to the user. At this time, the received signal-to-interference-noise ratio of the user is
[0043]
[0044] where P 1 Indicates the transmit power of the sub-6G base station, h 1,l represents the small-scale fading channel coefficient from the lth sub-6G base station to the user and obeys Rayleigh fading, represents the path loss gain, α 1 is the path loss coefficient, N 1 is the received noise power of the user, for the user around n 1 interference caused by a sub-6G base station. Generally, sub-6G base stations and users use omnidirectional antennas, so the antenna gain here is 1. h 1,k Represents the small-scale fading coefficients of the remaining k-th base station-to-user links and follows a Rayleigh distribution.
[0045] Step 4: If the millimeter-wave base station does not cache the content required by the user but the sub-6G base station caches the content required by the user, the K nearest sub-6G base stations to the user transmit signals to the user using a joint transmission strategy.
[0046] Step 5: If all base stations do not cache the content required by the user, the sub-6G base station closest to the user (ie the strongest signal) retrieves the corresponding content from the central server through optical fiber and transmits it to the user. At this time, let K=1, that is Indicates the received signal-to-interference-noise ratio when the user is associated with the nearest sub-6G base station.
[0047] Step 6: According to Step 3 to Step 5, for any content requested by the user, the probability of successful transmission can be expressed as:
[0048]
[0049] where Pr{·} represents the calculated probability, S 0 Represents a given mmWave base station path loss gain threshold, R T is the rate threshold at which the network can successfully transmit. with P s (R T ) is the optimization objective J o Create an optimization problem for the optimization variables:
[0050]
[0051] s.t.J o ∈Z +
[0052] J o ≤min{J 1 , J 2}
[0053] where max means to find the maximum value, s.t. means to obey the corresponding conditions, min{·} means to find the minimum value in the curly brackets, Z + Represents a positive integer. Solve the optimization problem and find the optimal solution It is used to configure the cache content of the sub-6G base station in the design step 1.
[0054] Simulation example:
[0055] In the embodiment of the present invention, the parameters of the heterogeneous wireless communication network with sub-6G and millimeter wave coexistence involved in the cache-enabled user association method applicable to the heterogeneous communication network are set as follows: λ 1 =5(km -2 ), λ 2 =80(km -2 ), P 1 =50(W), P 2 =5(W), ζ=0.8, J=100, J 1 =J 2 =40, K=2, α L =2, a N =4, a 1 =3, θ 2 =30°, β=1/141.4(m -1 ).
[0056] figure 2 A graph showing the relationship between the probability of successful transmission and a given rate threshold in the embodiment of the present invention is given. As can be seen from the figure, the probability of successful transmission decreases as the given rate threshold increases. Also, in part R T The probability of successful transmission in the changing interval varies with the density of millimeter-wave base stations λ 2 increases with the increase of , while in other intervals it increases with λ 2 decreases with the increase of , this is due to the density λ 2 The increase of , leads to an increase in the interference between base stations. The simulation diagram shows the simulation case and parameter λ of the embodiment of the present invention 2 possible effect on the probability of successful transmission.
[0057] image 3 The graph of the relationship between the cache placement parameters and the probability of successful transmission in the embodiment of the present invention is given, wherein Indicates the probability of being associated with a sub-6G base station when independent of the cache, and is related to the density λ of the millimeter-wave base station 2 negative correlation. As can be seen from the figure, by selecting the appropriate buffer allocation parameter J o can maximize the probability of successful transmission; in addition, the optimal J o Density λ with mmWave base stations 2 related, λ 2 When the larger is, the optimal J o The smaller, by J o The optimal probability of successful transmission can be achieved according to the adaptive changes of the network environment.
[0058] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, in the teachings of this invention, these features and embodiments may be modified to adapt a particular situation and material without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application fall within the protection scope of the present invention.
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