CN106060763B - D2D communication interference coordination method based on user position information - Google Patents

D2D communication interference coordination method based on user position information Download PDF

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CN106060763B
CN106060763B CN201610355014.4A CN201610355014A CN106060763B CN 106060763 B CN106060763 B CN 106060763B CN 201610355014 A CN201610355014 A CN 201610355014A CN 106060763 B CN106060763 B CN 106060763B
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cellular
users
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receiving end
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CN106060763A (en
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韦世红
黄祥
刘远航
叶宗刚
赵迎芝
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Abstract

The invention discloses a D2D communication interference coordination method based on user position information, which relates to an interference coordination technology in a cellular and D2D hybrid communication network, introduces D2D communication in an LTE-A system, and generates mutual interference between cellular users and D2D users. The method mainly comprises two stages, wherein in the first stage, a circular area which takes a base station as a center is obtained through the analysis of the interruption probability of cellular users, and the circular area is called a non-reuse area, namely D2D users in the area can not reuse the resources of the cellular users; in the second stage, through the analysis of the outage probability of the D2D users, a circular area centered on the D2D receiving end is obtained, which is called a non-resource area, i.e., the D2D users cannot reuse the resources of the cellular users within this range. The method can obviously reduce the interruption probability of cellular users and D2D users, simultaneously reduces the signaling burden on the base station side, and has good realizability.

Description

D2D communication interference coordination method based on user position information
Technical Field
The invention belongs to the technical field of mobile communication, and relates to an interference coordination technology in a cellular and D2D hybrid communication system.
Background
With the large-scale commercial use of 3G and 4G cellular networks and the popularization of various portable terminals such as smart phones and tablet computers, people have an explosive increase in the demand for large-bandwidth data communication. Although the bandwidth of the above network is continuously increasing, it is still difficult to meet the user's demand for large bandwidth services such as online high definition video, online real-time game, data real-time sharing, etc. How to use limited wireless resources to meet the requirements of users on efficient and reliable mobile broadband data services becomes a focus of common attention in the academic and industrial fields at present.
Since the licensed cellular spectrum bandwidth is limited, and the demand of users for cellular communication bandwidth is increasing, improving the spectrum utilization rate is a main method for solving the contradiction, which is also a core subject of the evolution of the wireless access network of the cellular system. In order to be able to efficiently utilize the limited cellular spectrum, an advanced near field communication technology, D2D communication technology, has come to work, and in 2012, the SA working group of 3GPP studies and discusses the feasibility of near field communication; in 12 months 2012, the university company proposed a "D2D proximity services under cell" project in the RAN congress. The project has been officially approved by the 3GPP, and the D2D technology has been officially entered into the standardization process of the LTE-a subsequent evolution.
In a conventional cellular communication system, data of both communication parties needs to be forwarded by a base station. The D2D communication means that the terminal and the terminal are in direct communication, when the distance between two users is relatively short, the two users can directly forward data without a base station, and the load of the base station is greatly reduced. The D2D communication technology not only can improve the throughput of the system, but also can reduce the energy consumption of the terminal, and at the same time, because it can multiplex the spectrum resources of the cellular users for communication, the spectrum efficiency of the system can be improved.
While the D2D communication brings many benefits, it also presents new challenges for radio resource management, especially when the D2D users reuse cellular user resources for communication, which brings serious co-channel interference between the two. When D2D users reuse cellular uplink resources for communication, interference will be generated to cellular users 'receptions at the base station side, and corresponding cellular users will generate interference to D2D users' receptions, and how to perform effective interference coordination and resource optimization to ensure QoS between D2D users and cellular users becomes an important issue for studying D2D communication.
However, in the existing research, the base station needs to know the channel state information of all communication links, and the channel state information between the cellular user and the D2D receiving end and between the D2D communication links is difficult to be acquired by the base station. Meanwhile, when a plurality of pairs of D2D users and cellular users are owned in a cell, the signaling burden of the base station is increased undoubtedly when acquiring the channel state information between communication links.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide an interference coordination method based on user location information, which can significantly reduce the outage probability between cellular users and D2D users, and reduce the signaling burden on the base station side, and the technical solution of the present invention is as follows:
a D2D communication interference coordination method based on user position information comprises the following steps:
101. in the first stage, a threshold value of the probability of interruption is setCalculating the interruption probability of the cellular user at the base station side to obtain a circular area which takes the base station as the center and takes the distance from the transmitting end of the D2D user to the base station as the radius, namely a non-multiplexing area, namely that the D2D user in the circular area can not multiplex the resources of the cellular user; the resources of the cellular users can be reused for communication only outside the area;
102. in the second stage, by calculating the outage probability of the D2D receiver under the cellular user interference, a circular area with the D2D receiver as the center and the distance from the cellular user to the D2D user receiver as the radius is obtained, i.e. the circular area is the non-resource area, i.e. the D2D user multiplexes the resources of the cellular users outside the range.
Further, step 101 adopts an interference model in a single-cell scenario, that is: the base station BS is positioned in the central area of a cell, and cellular users and D2D users are randomly distributed in the cell; suppose there is a pair of D2D users, N cellular users, in a cell and that one D2D user can reuse the resource of at most one cellular user, D2D-TXRepresenting the D2D transmitting end,D2D-RXIndicating the D2D recipient and the nth cellular user as the CUEn,Expressed as the distance, r, from the nth cellular user to the base stationDDenoted as the distance D2D from the transmitting end to the base station,denoted as cellular subscriber CUE1The distance to the receiving end of D2D, ρ, is the distance from the transmitting end of D2D to the receiving end.
Further, the received signal at the receiving end of D2D may be represented as:
in the above formula, xDDenoted as the signal transmitted by the transmitting end of D2D to the receiving end,a transmission signal, h, representing a cellular user iDD、Channel fading coefficients of the communication link denoted D2D and the communication link of the cellular user to the receiving end of D2D, respectively, all obey a Gaussian distribution, pD、Respectively representing the transmitting power of a D2D transmitting end and a cellular user, alpha is represented as a path loss exponent, n0Is additive white gaussian noise.
Further, the outage probability of the cellular user at the base station side in step 101 is:
whereinAndare respectively rDOf the probability density function and the distribution function, gammaBSSINR, gamma, representing cellular users at the base station sidemin|rDExpressing conditional probability, in case of protecting cellular user QoS:
firstly, according to their communication distance and SNR value to be realized, the safe distance r from D2D user to base station under the condition of guaranteeing QoS of cellular user is calculatedDminI.e. if the D2D user is located within a safe distance, the resources of the multiplexed cellular user are not allowed to communicate.
Further, the step 102 of calculating the interruption probability of the D2D user specifically includes:
first, the signal-to-dryness ratio of the receiving end of D2D is obtained hDDRepresents the channel fading coefficient between the receiving end and the transmitting end of the D2D user, eta represents the SNR of the D2D user, N0Which represents white gaussian noise, is generated,indicating the channel fading coefficients of the i-th cellular user to the D2D receiver,the transmitting power L representing the ith cellular user represents the ratio of the distance from the cellular user to the base station to the distance from the cellular user to the receiving end of D2D;
the outage probability for the D2D user is expressed as:
whereinAndare respectively asOf the probability density function and the distribution function, gamma0Representing the target SINR for the D2D user.
The invention has the following advantages and beneficial effects:
in the prior research, the base station needs to acquire the channel state information of all communication links to perform interference coordination, but the channel state information of the communication links which are not directly connected with the base station is difficult to acquire, and meanwhile, the signaling load of the base station is increased. Interference coordination based on user position information does not need to accurately acquire channel state information, so that the method has better practicability and reduces the signaling burden of a base station. During the communication process, the user only needs to continuously report the own position information to the base station. The base station judges whether the user can carry out D2D communication according to the position information of the user and allocates resources for the user.
Drawings
Fig. 1 is a diagram of an interference model when a D2D user multiplexes uplink resources of cellular users according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of a non-multiplexing area.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in FIG. 1, 1. System model
In this context, we consider interference analysis in a single cell scenario, as shown in fig. 1. The base station BS is positioned in the central area of the cell, and cellular users and D2D users are randomly distributed in the cellAnd (4) the following steps. In this document we assume that there is a pair of D2D users, N cellular users, in the cell. And specifies that a D2D user can reuse the resources of only one cellular user at most. In FIG. 1, D2D-TXDenotes the D2D transmitting terminal, D2D-RXIndicating the D2D recipient and the nth cellular user as the CUEn,Expressed as the distance, r, from the nth cellular user to the base stationDDenoted as the distance D2D from the transmitting end to the base station,denoted as cellular subscriber CUE1The distance to the receiving end of D2D, ρ, is the distance from the transmitting end of D2D to the receiving end.
Among them are:
in the D2D communication system, the D2D users communicate with the uplink resources of the multiplexed cellular users. In the case that the D2D user multiplexes uplink resources of the cellular user, interference may be generated on the base station side for communication of the cellular user, such as D2C interference in fig. 1; meanwhile, the cellular user interferes with the D2D communication at the receiving end of the conference D2D, such as the C2 conference in fig. 1. Therefore, the received signal at the receiving end of D2D can be expressed as:
in the above formula, xDDenoted as the signal transmitted by the transmitting end of D2D to the receiving end,a transmission signal, h, representing a cellular user iDD、Denoted D2D communication link and cellular user to D, respectivelyAnd the channel fading coefficients of the communication link at the 2D receiving end are distributed according to Gaussian distribution. p is a radical ofD、Respectively, the transmit power of the D2D transmitting end and the cellular user. Alpha is expressed as path loss exponent, n0Is additive white gaussian noise.
For the power of the cellular users and the D2D users, we adopt a fixed SNR scheme to set the transmit power of the cellular users and the D2D users. We set the SNR for cellular users and D2D users to η and ξ, respectively, as follows:
from equation (2), we can obtain that the SINR at the receiving end of D2D is:
in the same way, we can find that, under the interference of the D2D user, the SINR of the cellular user at the base station side is:
2. distance-based interference coordination technique
In this section, we resolve the interference between the D2D user and the cellular user in two steps. In the first step we will limit the interference of D2D users to cellular users by limiting the distance of D2D users to the base station; in the second step we mitigate the cellular user's interference to D2D users by limiting the distance from the cellular user to the D2D user.
2.1 base station side interference coordination
In the case where the D2D users reuse cellular user resources, the D2D users may interfere with the communication of the cellular users on the base station side. Since we use a fixed SNR scheme to control the cellular user transmit power, the equation (3A), (5) can be transformed into:
from the above equation, it can be seen that the SINR of the base station is independent of the location information of the cellular user, and in the case that the power of the D2D transmitting end is constant, the SINR of the base station is a function of the distance from the D2D transmitting end to the base station. We define the outage probability of the cellular user uplink as: when the SINR of the base station side is less than the minimum signal-to-interference-plus-noise ratio gamma required by the cellular communicationminWhen the cellular communication is interrupted.
The outage probability of a cellular subscriber at the base station side is therefore:
whereinAndare respectively rDThe probability density function and the distribution function.
If | h1|2And | h2|2For independent exponential distributions, let X ═ α | h1|2，Y＝β|h2|2+1/δ, and α, β, δ > 0, then the combined distribution function of Z ═ X/Y is:
in the formula (6), theAnd | hDBS|2For independent exponential distribution, the cellular usersThe outage probability at the base station side is:
we characterize the QoS of cellular users by the outage probability, and we can set an outage probability thresholdWhen the interruption probability of the cellular user is less than the threshold, the performance of the system is not affected, for example, we can setIs 0.05. Thus in case of protecting the QoS of cellular users, we have:
from the formulas (9) and (10), we can obtain:
we can further obtain from formula (3B):
let us order
That is, if the D2D users perform direct communication, the base station will first calculate the safe distance r from the D2D users to the base station under the condition of guaranteeing the QoS of the cellular users according to their communication distance and the SNR value to be achievedDminI.e. if the D2D user is located within a safe distance, and the resources of the cellular user are reused to perform communication, which causes serious interference to the cellular user, we define the distance to the base station to be within the safe distanceThe area within the distance is a non-multiplexing area. If the distance from the D2D user to the base station is beyond the safe distance, the D2D user can multiplex the resources of the cellular user for communication. The schematic diagram is shown in fig. 2.
2.2D2D receiver side interference coordination
In the following article we propose a distance-based method for selecting multiplexed cellular user resources for D2D users. As with the above interference on the coordinated base station side, we still characterize the QoS of D2D users with the outage probability on the D2D receiving side.
From equations (3B) and (4), we can also write the SINR at the receiving end of D2D as:
the outage probability for the D2D user can be expressed as:
whereinAndare respectively asThe probability density function and the distribution function. Then, from the formulas (4) and (8), we can obtain:
to ensure that the D2D user can communicate, the probability of interruption should be less than a certain threshold, we setFurther we can get:
by substituting formula (3A) into formula (16), we can obtain:
in this cell, let us assume the coordinates of the base station as (0,0), the coordinates of the cellular user as C (0,0), the coordinates of the receiving end of D2D as (a, b), and the coordinates of the cellular user as (x, y). Order:
then we have:
further comprises the following steps:
that is, in the case of a >1, the resources of the cellular users outside the circular area can be multiplexed for communication.
The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.

Claims (4)

1. A D2D communication interference coordination method based on user position information is characterized by comprising the following steps:
101. in the first stage, a threshold value of the probability of interruption is setCalculating the interruption probability of the cellular user at the base station side to obtain a circular area which takes the base station as the center and takes the distance from the transmitting end of the D2D user to the base station as the radius, namely a non-multiplexing area, namely that the D2D user in the circular area can not multiplex the resources of the cellular user; the resources of the cellular users can be reused for communication only outside the area;
102. in the second stage, by calculating the interruption probability of the D2D receiving end user under the interference of the cellular user, a circular area which takes the D2D receiving end as the center and takes the cellular user to the D2D receiving end as the radius is obtained, that is, a non-resource area, and the D2D user multiplexes the resources of the cellular user outside the circular area;
the QoS of the D2D user is characterized by the interruption probability of the D2D receiving end;
the SINR at the receiving end of D2D can be obtained as: represents the signal-to-noise-and-drying ratio, h, of the receiving end of D2DDDRepresents the channel fading coefficient between the receiving end and the transmitting end of the D2D user, eta represents the SNR of the D2D user, N0Which represents white gaussian noise, is generated,indicating the channel fading coefficients of the i-th cellular user to the D2D receiver,denotes the transmit power of the ith cellular user, alpha denotes the path loss exponent,indicating a cellular subscriber CUEiDistance to the receiving end of D2D;
the outage probability for the D2D user is expressed as:
whereinAndare respectively asThe probability density function and the distribution function of (a),signal to interference plus noise ratio, P, representing cellular usersrRepresenting the probability of interruption, gamma0Representing the target SINR for the D2D user;
the following can be obtained:
to ensure that the D2D user can communicate, the probability of interruption should be less than a certain threshold
Representing the interruption threshold, ξ represents the SNR of the D2D user,expressed as the distance of the ith cellular user from the base station;
in this cell, let us assume the coordinates of the base station as (0,0), the coordinates of the cellular user as C (0,0), the coordinates of the receiving end of D2D as (a, b), and the coordinates of the cellular user as (x, y), and let:
then there are:
further comprises the following steps:
that is, in the case where a >1, a represents a reusable value, and resources of cellular users outside the circular area can be multiplexed for communication.
2. The method of claim 1, wherein the step 101 adopts an interference model in a single-cell scenario, that is, the interference model is: the base station BS is positioned in the central area of a cell, and cellular users and D2D users are randomly distributed in the cell; suppose there is a pair of D2D users, N cellular users, in a cell and that one D2D user can reuse the resource of at most one cellular user, D2D-TXDenotes the D2D transmitting terminal, D2D-RXRepresenting the D2D receiving end, the nth cellular user is represented as CUEn,Expressed as the distance, r, from the nth cellular user to the base stationDDenoted as the distance D2D from the transmitting end to the base station,expressed as beesCUE for cellular users1The distance to the receiving end of D2D, ρ, is the distance from the transmitting end of D2D to the receiving end.
3. The method for coordinating communication interference of D2D based on user location information according to claim 2, wherein the received signal at the receiving end of D2D can be expressed as:
in the above formula, xDDenoted as the signal transmitted by the transmitting end of D2D to the receiving end,a transmission signal, h, representing a cellular user iDD、Channel fading coefficients of the communication link denoted D2D and the communication link of the cellular user to the receiving end of D2D, respectively, all obey a Gaussian distribution, pD、Respectively representing the transmitting power of a D2D transmitting end and a cellular user, alpha is represented as a path loss exponent, n0Is additive white gaussian noise.
4. The method of claim 2, wherein the outage probability of the cellular user of step 101 at the base station side is:
whereinAndare respectively rDOf the probability density function and the distribution function, gammaBSSINR, gamma, representing cellular users at the base station sidemin|rDExpressing conditional probability, in case of protecting cellular user QoS:
first based on their communication distance and the SNR value to be achieved,representing a threshold of interruption probability, calculating a safe distance r from a D2D user to a base station under the condition of guaranteeing the QoS of a cellular userminI.e. if the D2D user is located within a safe distance, the resources of the multiplexed cellular user are not allowed to communicate.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103079260A (en) * 2012-12-28 2013-05-01 浙江大学 D2D (Device to Device)-user power-controlling and resource-allocating method of fractional-frequency reuse honeycomb cell

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103079260A (en) * 2012-12-28 2013-05-01 浙江大学 D2D (Device to Device)-user power-controlling and resource-allocating method of fractional-frequency reuse honeycomb cell

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Distance-Based Interference Coordination for Device-to-Device Communications in Cellular Networks;Quang Duong;《IEEE Xplore》;20130930;正文第2-5节以及图1 *
Distance-based resource allocation scheme for device-to-device communications underlaying cellular networks;Quang Duong;《ELSEVIER》;20150620;全文 *
Distance-constrained resource-sharing criteria for device-to-device communications;H. Wang;《Electronics Letters》;20120426;全文 *
Region Division Based Spectrum Access of D2D Communication under Heterogeneous Networks;Yang Yang;《IEEE Xplore》;20150121;正文第2部分和第3部分 *

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