CN107484180B - Resource allocation method based on D2D communication in very high frequency band - Google Patents
Resource allocation method based on D2D communication in very high frequency band Download PDFInfo
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- 238000013468 resource allocation Methods 0.000 title claims abstract description 17
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Abstract
The invention requests to protect a resource allocation method for D2D communication in a very high frequency band. Firstly, selecting cellular user resources which can be multiplexed by a D2D user by utilizing a linear correlation method; secondly, finding a set of D2D user pairs multiplexing each cellular user resource by using a data rate maximization criterion; finally, a resource allocation method based on interference control is provided, by comparing the throughput, the best cellular user is selected from the reusable cellular user resources to share the resources with the D2D user, and the service quality (QoS) of cellular communication and D2D communication is ensured. The invention can control the interference between the D2D user and the cellular user, improve the system throughput and the spectrum efficiency and reduce the complexity of the algorithm.
Description
Technical Field
The present invention belongs to the technical field of wireless communication, and in particular, to a resource allocation scheme for D2D (Device to Device) communication in a very high frequency band.
Background
In recent years, with the prevalence of intelligent terminals such as mobile phones and tablet computers, mobile data traffic is rapidly increased, and the available frequency band is increasingly tense, so that to meet the increasing diversified service requirements of terminals, it is necessary to greatly improve the spectrum utilization rate and throughput of a wireless network, and a 5G communication technology capable of greatly improving the data transmission rate is a research hotspot, wherein the 5G technology which attracts the most attention in the industry is millimeter wave and D2D communication.
The introduction of the D2D communication technology into a cellular network can increase the capacity of a communication system, improve the spectrum efficiency of the system, increase the data transmission rate, reduce the load of a base station, and the like. The D2D communication technology can use cell resources (orthogonal mode) or multiplexed cell resources (non-orthogonal mode is also called multiplexed mode) to perform communication under the control of the base station, and at present, the D2D communication is mostly studied in the multiplexed mode. The reuse mode may generate serious interference to affect the system performance, and how to make the resource allocation method with interference reduction become the research focus of D2D communication while ensuring the service quality of cellular users and D2D users, therefore, a lot of research has been focused on this and discussed and studied. However, most models are that one D2D user can only multiplex one cellular user, and in a real scene, a plurality of cellular users and a plurality of D2D users exist simultaneously.
As the millimeter waves belong to a very high frequency band (30-300GHz), the frequency spectrum resources of the band are rich, and a large number of continuous frequency spectrums, such as 28GHz, 60GHz and 38GHz, E bandwidths (71-76GHz and 77-81GHz) and the like, can effectively relieve the current situation of the shortage of frequency spectrum resources. Meanwhile, the millimeter wave has the advantages of short single-hop communication distance, few interference sources, capacity of providing gigabit communication service, capability of greatly improving system capacity and transmission rate and the like.
The advantages of the millimeter wave and D2D communication are significant, making the use of D2D communication in millimeter wave cellular networks of increasing interest. There are some researchers who have studied this, but rarely study the interference problem in resource allocation.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. A resource allocation method based on D2D communication under a very high frequency band is provided, which can effectively control the complexity of an algorithm, control the interference between cellular users and D2D users and ensure the reliability of the cellular users and D2D communication links. The technical scheme of the invention is as follows:
a resource allocation method based on D2D communication in a very high frequency band, comprising the steps of:
the method comprises the following steps: the base station acquires the position information of all users, and selects cellular user resources which can be multiplexed by each D2D user by using a linear correlation method;
step two: using a data rate maximization criterion to find a set of D2D user pairs that reuse each cellular user resource;
step three: the resource allocation scheme comprises the following steps: through interference control, the best cellular user is selected from the reusable cellular user resources to share the resources with the D2D user, and the service quality of cellular communication and D2D communication is ensured.
Further, the selecting, in the step one, cellular user resources that can be multiplexed by each D2D user by using a linear correlation method specifically includes:
first, the constraint is found by the SINR for both cellular users and D2D users; then, the value at the intersection of two lines b1 and b2 in FIG. 3 is obtained, and the intersection value is A; finally, determining a cellular user set which can be reused by the D2D user: the D2D user has a reusable cellular user resource only if intersection a exists. And the intersection point a is within the area enclosed by the dotted line and the coordinates in fig. 3, the QoS of the cellular user and the D2D user can be guaranteed. The shaded area in FIG. 3 is pcAnd pdCan be used.
Wherein p iscAnd pdIs the transmit power, H, of the cellular user, D2D user transmitterd,d、Hc,d、Hc,B、Hd,BChannel gains, N, for D2D transmitter to D2D receiver, cellular user to D2D receiver, cellular user to base station, D2D transmitter to base station, respectivelycAnd NdIs Gaussian white noise, and is N0，xAIndicating the transmit power, y, of the cellular userARepresenting the transmit power of the D2D user,
SINR thresholds for cellular users and D2D users, provided that the value at the intersection satisfies the following equation
Then there are cellular users that can be multiplexed, where,
the maximum transmit power for cellular users and D2D users.
Further, the step two of finding the set of D2D user pairs multiplexing each cellular user resource by using the rate maximization criterion is according to argmax { R }c+RdDetermine which D2D users each cellular user can share its own spectrum resources, where Rc，RdIs the data rate of the cellular user and the D2D user.
Further, the selecting the best cellular user from the reusable cellular user resources to share the resources with the D2D user through the interference control in the third step specifically includes: first, an interference threshold is preset
When multiple D2D users reuse the same resource, mutual interference will also occur between them, and the total interference of D2D users to the base station is less than the interference threshold
Only D2D users that meet both the QoS requirements of D2D users' own quality of service QoS and the QoS of the cellular system can access the communication.
Further, the screening process of each cellular user and which D2D users finally share the resource is as follows:
first, it is judged
If it does, move the D2D user out of the set omegacIn which Id,BIs the interference, Ω, of the D2D user transmitter to the base stationcFor the D2D user pair set of the multiplexing cellular user c resource, then judge
If it is not true, then the value is omegacThe D2D user causing the largest interference to the base station is removed until the requirement is met
And put the removed D2D users into set D*，D*Is a set of updated D2D users;
secondly, determining rho value, rho being optimized allocation value, if D2D user D reuses the resources of cellular user c, rhoc,d1, otherwise ρc,dρ is the solution of the optimization problem, 0;
finally, judge D*Whether the distribution is empty or not, and if the distribution is empty, the distribution is finished; otherwise, for D*The D2D users are allocated to the cellular users which are not multiplexed according to the above steps, if there are no cellular users which are not multiplexed, the cellular users which make the system throughput reach suboptimum are allocated, and the above steps are repeated, so that the above steps are iterated until the D2D users can be allocated with resources.
The invention has the following advantages and beneficial effects:
the invention is researched under a very high frequency band, can relieve the problem of scarce frequency spectrum resources, and provides a resource allocation scheme based on interference control under the condition of meeting the QoS requirement of a user. The method can screen out reusable cellular users by utilizing a linear correlation method, and finds out a D2D user pair set reusing each cellular user resource by utilizing a data rate maximization criterion, so that the calculation complexity can be reduced, the interference among users can be reduced, and the system throughput and the spectrum efficiency can be improved.
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FIG. 1 is a system model schematic of a preferred embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a preferred embodiment of the present invention;
fig. 3 is a schematic diagram illustrating selection of potential multiplexing objects according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
as shown in fig. 1: assuming that N cellular users are randomly distributed in the cell, each cellular user is allocated with an RB orthogonal to each other, the number of resource blocks is the number of cellular users, denoted as C { C1, 2,3.., N }, and M D2D users, denoted as D { D1, 2,3.., M }. Assuming that multiple pairs of D2D users in this cell can reuse the uplink resources of the same cellular user, in this scenario, interference between cellular users and D2D users can occur, and the interference between D2D users is not negligible. For these interferences, the interference between them can be controlled by controlling their power appropriately. Based on the system model of fig. 1, the present invention discloses a resource allocation scheme based on interference control, and as shown in fig. 2, the resource allocation scheme based on the restricted area may include the following steps:
the method comprises the following steps: the linear programming is utilized to determine the cellular user resources that can be reused by the D2D user, as shown in fig. 3, specifically including:
first, the constraint is found by the SINR for both cellular users and D2D users; then, the value at the intersection of two lines b1 and b2 in FIG. 3 is obtained, and the intersection value is A; finally, determining a cellular user set which can be reused by the D2D user: the D2D user has a reusable cellular user resource only if intersection a exists. And the intersection point a is within the area enclosed by the dotted line and the coordinates in fig. 3, the QoS of the cellular user and the D2D user can be guaranteed. The shaded area in FIG. 3 is pcAnd pdCan be used.
Wherein p iscAnd pdIs the cellular user, D2D transmit power to the transmitter, Hd,d、Hc,d、Hc,B、Hd,BChannel gains, N, for D2D transmitter to D2D receiver, cellular user to D2D receiver, cellular user to base station, D2D transmitter to base station, respectivelycAnd NdIs Gaussian white noise, and is N0，
SINR thresholds for cellular users and D2D users.
The cellular user resources may be shared by the D2D users as long as the value at the intersection satisfies the following equation (2).
Wherein,
maximum transmit power for cellular and D2D users
Step two: finding a set of D2D user pairs that multiplex each cellular user resource using a rate maximization criterion is according to argmax Rc+Rd}(Rc，RdThe data rates of the cellular users and the D2D users) to determine which D2D users each cellular user may share its own resources with.
Step three: the resource allocation for the D2D user is based on the interference control method, firstly, an interference threshold is preset
When multiple D2D users reuse the same resource, mutual interference will also occur between them, and the total interference of D2D users to the base station is less than the interference threshold
Only those D2D users that meet both the QoS requirements of the D2D user themselves and the QoS of the cellular system can access the communication. The screening process for each cellular user and which D2D users eventually share the resource is as follows:
1) first, it is judged
If it does, move the D2D user out of the set omegacIn which Id,BIs the D2D user transmitter pair baseInterference of stations, omegacFor the D2D user pair set of the multiplexing cellular user c resource, then judge
If it is not true, then the value is omegacThe D2D user causing the largest interference to the base station is removed until the requirement is met
And put the removed D2D users into set D*(D*A set of updated D2D users).
2) Determining rho value (rho is optimized allocation value), if D2D user D multiplexes resources of cellular user c, then rhoc,d1, otherwise ρ c,d0. ρ is the solution of the optimization problem.
3) Judgment of D*Whether the distribution is empty or not, and if the distribution is empty, the distribution is finished; otherwise, for D*The D2D user is allocated to the cellular user which is not multiplexed according to the above steps, and if there is no cellular user which is not multiplexed, the cellular user which makes the system throughput reach suboptimum is allocated to the cellular user, and the above steps are repeated. This is iterated until the D2D user can be assigned resources.
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 (3)
1. A resource allocation method based on D2D communication in very high frequency band, comprising the following steps:
the method comprises the following steps: the base station acquires the position information of all users, and selects cellular user resources which can be multiplexed by each D2D user by using a linear correlation method;
step two: using a data rate maximization criterion to find a set of D2D user pairs that reuse each cellular user resource;
step three: the resource allocation scheme comprises the following steps: through interference control, the best cellular user is selected from the reusable cellular user resources to share the resources with the D2D user, and the service quality of cellular communication and D2D communication is ensured;
the selecting the best cellular user from the reusable cellular user resources to share the resources with the D2D user through interference control in the third step specifically includes: first, an interference threshold is preset
When multiple D2D users reuse the same resource, mutual interference will also occur between them, and the total interference of D2D users to the base station is less than the interference threshold
Only the D2D users who satisfy both the QoS requirements of the D2D users themselves and the QoS of the cellular system can access the communication;
the screening process of each cellular user and which D2D users share the resource is as follows:
first, it is judged
If it is not true, move the pair of D2D out of the set omegacIn which Id,BIs the interference, Ω, of the D2D user transmitter to the base stationcFor the D2D user pair set of the multiplexing cellular user c resource, then judge
If it is not true, then the value is omegacThe D2D user causing the largest interference to the base station is removed until the requirement is met
And put the removed D2D users into set D*，D*Is a set of updated D2D users;
secondly, determining a rho value, wherein rho is an optimal allocation value, and if D2D is usedUser d multiplexes resources of cellular user c, then ρc,d1, otherwise ρc,dρ is the solution of the optimization problem, 0;
finally, judge D*Whether the distribution is empty or not, and if the distribution is empty, the distribution is finished; otherwise, for D*The D2D users are allocated to the cellular users which are not multiplexed according to the above steps, if there are no cellular users which are not multiplexed, the cellular users which make the system throughput reach suboptimum are allocated, and the above steps are repeated, so that the above steps are iterated until the D2D users can be allocated with resources.
2. The method as claimed in claim 1, wherein the step one of selecting the cellular user resources that can be reused by each D2D user by using linear correlation comprises:
first, the constraint is found by the SINR for both cellular users and D2D users; then, the value of the intersection point of the two lines b1 and b2 is obtained, and the intersection point value is A; finally, determining a cellular user set which can be reused by the D2D user: the D2D user has the reusable cellular user resource only when the intersection point A exists, and the intersection point A is used for finding the reusable cellular user resource in an area surrounded by the cellular user and the maximum transmitting power of the D2D user;
wherein p iscAnd pdIs the transmit power, H, of the cellular user, D2D user transmitterd,d、Hc,d、Hc,B、Hd,BChannel gains, N, for D2D transmitter to D2D receiver, cellular user to D2D receiver, cellular user to base station, D2D transmitter to base station, respectivelycAnd NdIs Gaussian white noise, and is N0，xAIndicating the transmit power, y, of the cellular userARepresents the transmit power, r, of the D2D userc th,rd thSINR thresholds for cellular and D2D users, as long as the intersection pointThe value of (A) satisfies the following formula
Then there are cellular users that can be multiplexed, where,
the maximum transmit power for cellular users and D2D users.
3. The method for resource allocation based on D2D communication in VHF band according to claim 1 or 2, wherein the rate maximization criterion is used to find the set of D2D user pairs multiplexing each cellular user resource in step two according to argmax { Rc+RdDetermine which D2D users each cellular user can share its own spectrum resources, where Rc，RdIs the data rate of the cellular user and the D2D user.
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| CN108848562B (en) * | 2018-05-24 | 2022-05-31 | 重庆邮电大学 | Resource allocation method based on one-to-many matching in heterogeneous network |
| CN110166149B (en) * | 2019-04-15 | 2021-05-04 | 中电科（宁波）海洋电子研究院有限公司 | Channel self-adaptive selection method suitable for very high frequency radio device |
| CN111031547B (en) * | 2019-12-19 | 2022-04-29 | 湖北大学 | Multi-user D2D communication resource allocation method based on spectrum allocation and power control |
| CN111245503B (en) * | 2020-01-17 | 2020-11-03 | 东南大学 | Spectrum sharing method for satellite communication and ground communication |
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