CN114513854B - Uplink resource sharing method for cellular network and D2D communication and related equipment - Google Patents

Uplink resource sharing method for cellular network and D2D communication and related equipment Download PDF

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CN114513854B
CN114513854B CN202210112433.0A CN202210112433A CN114513854B CN 114513854 B CN114513854 B CN 114513854B CN 202210112433 A CN202210112433 A CN 202210112433A CN 114513854 B CN114513854 B CN 114513854B
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cellular
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users
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CN114513854A (en
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刘芳
李志昕
刘元安
于翠屏
黎淑兰
吴帆
刘晓龙
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The application provides an uplink resource sharing method and related equipment for cellular network and D2D communication, wherein the method comprises the following steps: by establishing a resource sharing model of uplink cellular multi-user and multi-group D2D user pairs, an optimization problem aiming at maximizing the number of shared D2D user pairs is provided, the problem is converted into a system interference minimum problem to be solved step by step, and under the condition that the minimum service quality requirement of all users is ensured, more D2D user pairs can work on the same frequency resource by designing the sharing sequence and the sending power of the D2D user pairs, so that the frequency spectrum utilization rate is effectively improved.

Description

Uplink resource sharing method for cellular network and D2D communication and related equipment
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and related device for sharing uplink resources in cellular network and D2D communications.
Background
With the rapid development of wireless mobile communication, in the case of limited wireless spectrum resources, in order to meet the explosive growth demands of mobile communication devices and wireless data traffic, a communication system in which Device-to-Device (D2D) technology and wireless cellular network perform resource sharing is an important research direction.
The D2D technology allows adjacent devices to directly communicate without depending on participation of a base station, and has the characteristics of high speed, small delay, wide coverage and the like. At present, the multiplexing mode in the D2D communication mode is that the D2D user pair shares the same spectrum resource with the cellular user under the control of the base station, and under the constraint condition of meeting certain communication, multiple groups of D2D user pairs can share the same resource with one cellular user or can share the same resource with multiple cellular users, so that the D2D multiplexing cellular network has remarkable advantages in terms of improving the spectrum utilization rate and supporting multi-user communication. In addition, the introduction of Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology is also further helpful for Multi-User collaborative communication. MU-MIMO refers to a technology in which a base station makes full use of spatial resources of antennas to communicate with multiple users simultaneously, and a transmitting end and a receiving end each use multiple antennas to form an antenna system of multiple channels between transmission and reception. The MU-MIMO can realize resource sharing in time, frequency and power through multi-antenna diversity gain, and obtains gains in both reliability and effectiveness by utilizing space resources on the basis of fully utilizing the existing spectrum resources. Therefore, in view of the simplicity and efficiency of D2D, applying D2D technology to an uplink cellular system of multi-user MIMO has become an effective way to expand multi-user communication.
However, the introduction of the D2D technology multiplexing mode brings the gain to the MU-MIMO cellular network, and at the same time, also causes a complex interference problem, mainly including co-channel interference between D2D users and cellular users and interference between D2D user pairs. Therefore, how to choose a D2D pair sharing resources with a cellular network to reduce the interference problem to it is studied by many. In the existing D2D pair sharing sequence design scheme, most of the D2D pairs are aimed at maximizing the signal-to-noise ratio of the system and the rate or the link, and the fixed number of D2D pairs are selected to realize the communication of the system, so that no further study is made on whether more user communication can be shared after the system and the rate reach the maximum, and how to select the D2D pair sharing sequence to realize the problem of maximizing the number of multiplexing users is further discussed.
Disclosure of Invention
In view of this, an object of the present application is to provide an uplink resource sharing method and related device for D2D communication in a cellular network.
Based on the above objects, the present application provides an uplink resource sharing method for cellular network and D2D communication, including:
constructing a cellular D2D resource sharing network model, wherein the network model comprises a base station with multiple configured antennas, a plurality of cellular users with single configured antennas and a plurality of groups of D2D user pairs, the cellular users communicate with the base station in a multi-input multi-output MU-MIMO mode, and the plurality of groups of D2D users communicate with uplink cellular users in the plurality of cellular users by using the same frequency spectrum resources;
In the cellular uplink communication, grouping a plurality of cellular users, and respectively calculating the transmission power of each of the cellular users in each group with the aim of maximizing the total communication rate, wherein a group of cellular users with the minimum total transmission power is taken as the uplink cellular users, and meanwhile, each of the cellular users in the uplink cellular users meets the constraint conditions of the minimum service quality and the maximum transmission power;
taking the minimum interference of the D2D user to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs, selecting one D2D user pair with the minimum transmission power to carry out resource sharing with the uplink cellular user, wherein the D2D user pair meets the constraint condition of the minimum service quality and the maximum transmission power of the uplink cellular user and a D2D link;
performing the following operation on each group of the D2D user pairs of all the remaining D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting one D2D user pair with the minimum transmission power as the D2D user pair to be resource-shared and the uplink cellular user,
Until all the D2D pairs complete resource sharing or all the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints of the uplink cellular users and D2D links.
Based on the same inventive concept, the application also provides an uplink resource sharing device for cellular network and D2D communication, which comprises:
a model building module configured to build a cellular D2D resource sharing network model, where the network model includes a base station configured with multiple antennas, multiple cellular users configured with single antennas, and multiple sets of D2D user pairs, where the cellular users communicate with the base station through a multiple-input multiple-output MU-MIMO manner, and multiple sets of D2D users communicate with uplink cellular users of the multiple cellular users using the same spectrum resources;
an uplink cellular user determining module, configured to group a plurality of cellular users in cellular uplink communication, and respectively calculate a transmission power of each of the cellular users in each group, with a goal of maximizing a total communication rate, and take a group of cellular users with a minimum total transmission power as the uplink cellular users, where each of the cellular users in the uplink cellular users meets constraint conditions of a minimum service quality and a maximum transmission power;
A D2D user-to-resource sharing module configured to calculate a transmission power of each group of the D2D user pairs with minimum interference of the D2D user pair to the uplink cellular user as an optimization target, and select one D2D user pair with minimum transmission power to perform resource sharing with the uplink cellular user, where the D2D user pair meets constraint conditions of minimum service quality and maximum transmission power of the uplink cellular user and D2D link;
performing the following operation on each group of the D2D user pairs of all the remaining D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting one D2D user pair with the minimum transmission power as the D2D user pair to be resource-shared and the uplink cellular user,
until all the D2D pairs complete resource sharing or all the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints of the uplink cellular users and D2D links.
Based on the same inventive concept, the application also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, the processor implementing the method as described above when executing the computer program.
Based on the same inventive concept, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method as described above.
From the above, it can be seen that, by establishing the uplink resource sharing network model of the MU-MIMO and the D2D user pairs, the method and the related device for sharing uplink resources between the cellular network and the D2D communication provided by the present application propose a D2D user pair sharing sequence selection scheme for combining channel state information and power allocation, and select a shared D2D pair set to solve the optimization problem on the basis of the principle of minimum interference to the network model, thereby significantly improving the system spectrum utilization. According to the D2D user pair selection scheme, under the given spectral efficiency and node power limitation, after a group of D2D user pairs are shared each time, the optimal transmitting power of each group of D2D user pairs in a shared set is updated, namely, the transmitting power of the D2D user pairs which are shared is required to be readjusted along with the latest D2D user pairs which are shared. Aiming at the current situation that the existing resources are tense and the mass of users is increased, under the condition that the basic communication quality of working users is ensured, more D2D user pairs can work on the same frequency spectrum by adjusting the sharing sequence and the sending power of the D2D user pairs, and the frequency spectrum utilization rate is effectively improved.
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In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a flow chart of an uplink resource sharing method of a cellular network and D2D communication according to an embodiment of the present application;
fig. 2 is a schematic diagram of D2D link and cellular uplink spectrum sharing according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an uplink resource sharing device for D2D communication in the cellular network according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present application provides an uplink resource sharing method for cellular network and D2D communication, including the following steps:
step S101, constructing a cellular D2D resource sharing network model, wherein the network model comprises a base station with multiple configured antennas, a plurality of cellular users with single configured antennas and a plurality of groups of D2D user pairs, the cellular users communicate with the base station in a multi-input multi-output MU-MIMO mode, and the plurality of groups of D2D users communicate with uplink cellular users in the plurality of cellular users by using the same frequency spectrum resources.
Specifically, a network model of sharing a frequency spectrum between a plurality of groups of D2D user pairs and uplink multi-user multi-input multi-output MU-MIMO cellular users is constructed, so that the D2D user pairs and the uplink cellular users work in the same frequency spectrum, and the maximization of the number of the shared D2D user pairs is realized under the condition of ensuring the basic communication quality of the uplink cellular users.
Step S102, in the cellular uplink communication, grouping a plurality of cellular users, and respectively calculating the transmission power of each of the cellular users in each group with the aim of maximizing the total communication rate, wherein a group of cellular users with the minimum total transmission power is used as the uplink cellular users, and meanwhile, each of the cellular users in the uplink cellular users meets the constraint conditions of the minimum service quality and the maximum transmission power.
In this embodiment, in the network model, the number N of base station antennas should be less than or equal to the number C of cellular users, and N cellular users are arbitrarily selected from C cellular users to perform uplink MU-MIMO transmission with the goal of maximizing the MU-MIMO uplink total communication capacity under the condition of meeting the communication quality requirements of the cellular users, and according to the permutation and combination theory, the method can obtain
Figure BDA0003495206560000061
The possible uplink MU-MIMO transmission cellular user group is planted, then the total communication capacity of each group of MU-MIMO transmission cellular users is maximized as target, and the optimization algorithm is adopted for the uplink MU-MIMO transmission cellular users>
Figure BDA0003495206560000062
Each group of MU-MIMAnd performing power distribution on the O transmission cellular users, and selecting a group of cellular users with the smallest total transmission power as uplink cellular users for uplink communication with the base station.
And step 103, calculating the transmission power of each group of D2D user pairs by taking the minimum interference of the D2D user pairs to the uplink cellular users as an optimization target, selecting a group of D2D user pairs with the minimum transmission power to carry out resource sharing with the uplink cellular users, wherein the D2D user pairs meet the constraint conditions of the minimum service quality of the uplink cellular users and D2D links and the maximum transmission power of the D2D users.
Specifically, each group of D2D user pairs are respectively shared with the network model, uplink interference of the D2D user pairs received by a base station is calculated in a minimized manner, so that the transmission power of the D2D user pairs is determined, based on the same method, uplink transmission power of all the D2D user pairs is determined, a group of D2D user pairs with the smallest transmission power is selected to share resources with the uplink cellular users, and meanwhile, the D2D user pairs meet constraint conditions of minimum service quality and maximum transmission power of the uplink cellular users and D2D links.
Step S104, performing the following operations on each group of the D2D user pairs in the remaining all D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting a group of the D2D user pairs with the minimum transmission power as the D2D user pairs to be resource-shared and the uplink cellular user,
until all the D2D pairs complete resource sharing or all the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints of the uplink cellular users and D2D links.
Specifically, a first group of D2D user pairs that perform resource sharing with the uplink cellular users is determined through step S103, a sharing set is constructed, an initial sharing set is set to be empty, interference among the D2D user pairs is not considered when the first group of D2D user pairs are selected for sharing, and only the D2D user pair with the smallest uplink interference to the cellular network is selected. And after the first group of D2D user pairs are selected, verifying constraint conditions of the first group of D2D user pairs, and if the minimum service quality of the uplink cellular users and the D2D links and the maximum transmission power constraint conditions of the D2D users are met, putting the first group of D2D user pairs into a shared set as a first sharing user pair. After each selection of a shared D2D user pair, the D2D user pairs in all shared sets will be reallocated with the goal of minimum total interference.
After the first sharing user is selected, traversing all the remaining D2D user pairs, taking the interference to the uplink cellular user, which is coacted with the first sharing user, as an optimization target, selecting the D2D user pair with the minimum transmission power as a second sharing user to share resources with the uplink cellular user, putting the second sharing user pair into a sharing set, and selecting the other sharing users by the same method as the second sharing user until all the remaining D2D user pairs are shared or the D2D pair meeting the minimum service quality and maximum transmission power constraint conditions of the uplink cellular user and the D2D link does not exist.
Finally, the number of elements in the D2D pair set is the maximum number of shared D2D user pairs. According to the method and the device, the sharing sequence and the sending power of the D2D user pairs are adjusted, so that more D2D user pairs can work on the same frequency spectrum, and the frequency spectrum utilization rate is effectively improved.
In some embodiments, the network model specifically includes: the system comprises a single cell model or a multi-cell model formed by a plurality of single cell models, wherein the single cell model comprises a base station positioned in the center of the single cell model, a plurality of cellular users and a plurality of groups of D2D user pairs, each D2D user pair comprises a transmitting end and a receiving end, the cellular users perform uplink resource sharing transmission in a multi-user MIMO mode, and signal interference among the plurality of cellular users is eliminated through a preset method.
Specifically, referring to fig. 2, which is a single-cell network model, the figure includes two concentric circles with radii R and R, a base station BS is located at the center of a circle, and C cellular users are located in small circles with radii R, which are CU respectively 1 、CU 2 …CU C . D group D2D user pairs are distributed on a circular ring formed by two concentric circles with radius, cellular users carry out uplink communication with a base station BS, and a transmitting end D in the D2D user pairs T And receiving end D R Communication is carried out as useful signals, and the D2D user pairs are (D R1 ，D T1 )、(D R2 ，D T2 )…(D RD ，D TD ). The interference signals include interference of the cellular user CU to the D2D user pair, interference of the D2D user pair to the base station BS, and interference between the D2D user pair. In the MU-MIMO system, interference among multiple signals can be eliminated by various conventional methods such as precoding, and in this embodiment, zero-forcing precoding is adopted.
In other embodiments, the network model may also be a plurality of single-cell models, and the plurality of single-cell models is composed of a plurality of single-cell network models.
In some embodiments, the calculating the transmission power of each group of the D2D user pairs with the D2D user having the minimum interference to the uplink cellular user as an optimization target includes:
determining the interference as based on an interference environment of the network model
Figure BDA0003495206560000081
wherein ,Pj Transmit power for said D2D user pair,/->
Figure BDA0003495206560000082
Transmitting terminal D for the D2D user pair Tj Channel gains to the base station B, j being the index of the j-th D2D user pair, the channel gains including equivalent channel gains after large-scale and small-scale fading;
by interfering with the interference
Figure BDA0003495206560000083
Proceeding withMinimizing calculation to obtain transmitting ends D of each group of D2D user pairs Tj Is set to be equal to the transmission power P of (2) j 。
Specifically, for the established network model, an interference scene in the communication process of the user is determined, wherein the interference scene comprises an interference signal of communication of a cellular user and an interference signal of communication of a D2D user, and an interference factor is determined through the interference signal, so that the signal-to-interference-and-noise ratio of the cellular user and the signal-to-interference-and-noise ratio of the D2D user to a receiving end are calculated. According to the interference scene and the network model, after sharing M pairs of D2D user pairs, the ith cellular user C i Reception signal to base station BS
Figure BDA0003495206560000084
The method comprises the following steps:
Figure BDA0003495206560000085
/>
wherein ,
Figure BDA0003495206560000086
represent C i Channel vector with BS->
Figure BDA0003495206560000087
A transpose vector representing the channel vector, h lk ∈C 1×1 (l＝D Tj ,C i ；k＝B,D Rj ) Representing channel coefficients between users, assuming that small-scale fading of the channel follows Rayleigh distribution, the mean value of the terms of the channel coefficients is 0, the variance is 1, and large-scale fading mainly considers path loss caused by distance, L lk (l＝D Tj ,C i ；k＝B,D Rj ) Represents path loss, L lk ＝(d lk ) -α ，d lk Representing the distance between user i and user k, alpha being the path loss index, +.>
Figure BDA0003495206560000088
For the transmission power of the ith cellular subscriber, P j For the transmit power of the j-th pair D2D user pair,
Figure BDA0003495206560000089
to from C i 1 XN data vectors sent to BS, ">
Figure BDA00034952065600000810
Figure BDA00034952065600000811
To from D j 1 XM data vectors sent to BS, channel mean +.>
Figure BDA00034952065600000812
Figure BDA00034952065600000813
Representing cellular subscriber C i N, n B Representing zero-mean complex Gaussian noise at BS with power +.>
Figure BDA00034952065600000814
D Tj Transmitting end for D2D user pair, D Rj The receiving end of the D2D user pair, B is a base station BS, C i Is a cellular user.
After eliminating interference between cellular users through zero-forcing precoding, the ith cellular user C i The received signal expression to BS link is:
Figure BDA00034952065600000815
according to the interference scene and the signal model, the receiving end D of the j-th pair in the shared M-pair D2D user pair Rj The received signal expression of (2) is:
Figure BDA0003495206560000091
wherein ,Pj and Pm Representing the transmit power of different D2D user pairs after power allocation,
Figure BDA0003495206560000092
transmission information indicating j-th pair D2D user pair,/->
Figure BDA0003495206560000093
Zero mean complex Gaussian noise of j-th pair D2D user pair receiving end is represented, and power is +.>
Figure BDA0003495206560000094
According to the interference scene and the signal model analysis, the signal-to-interference-and-noise ratio of the signal received by the ith cellular user at the base station
Figure BDA0003495206560000095
The method comprises the following steps:
Figure BDA0003495206560000096
signal-to-interference-and-noise ratio of signal received by receiving end of j-th D2D user pair
Figure BDA0003495206560000097
The method comprises the following steps:
Figure BDA0003495206560000098
to simplify the representation, let G lk ＝L lk |h lk | 2 (l＝D Tj ，C i ；k＝B、D Rj ) Expressed as channel gain, equation (4) and equation (5) can be expressed as equation (6) and equation (7). Signal-to-interference-and-noise ratio of the cellular subscriber
Figure BDA0003495206560000099
Expressed as:
Figure BDA00034952065600000910
the D2D user has a signal-to-interference-and-noise ratio to the receiving end
Figure BDA00034952065600000911
Expressed as: />
Figure BDA00034952065600000912
wherein ,
Figure BDA00034952065600000913
transmit power for cellular subscriber, +. >
Figure BDA00034952065600000914
For cellular subscriber C i Channel gain to base station BS, i=1, …, N is the number of uplink cellular users in the cellular network, P j Transmit power for D2D user pair, +.>
Figure BDA00034952065600000915
Transmitting terminal D for D2D user Tj Channel gain to base station BS, j=1, …, M is the number of D2D user pairs shared into the cellular network, +.>
Figure BDA00034952065600000916
Zero mean complex Gaussian noise power at base station, < >>
Figure BDA00034952065600000917
Transmitting terminal D for D2D user Tj To receiving end D Rj Channel gain, P of m The transmit power for a D2D user pair, where m+.j, +.>
Figure BDA00034952065600000918
Transmitting terminal D for D2D user Tm To receiving end D Rj Channel gain of>
Figure BDA00034952065600000919
For cellular subscriber C i Receiving end D to D2D user pair Rj Channel gain of>
Figure BDA0003495206560000101
Zero-mean complex gaussian noise power for the opposite side of the D2D user. In order to share as many D2D user pairs as possible, it is necessary to minimize the interference of D2D users sharing the same spectrum to cellular users, as can be seen from equation (6), the interference of D2D users to cellular users is mainly determined by transmit power and interference channel gain ∈ ->
Figure BDA0003495206560000102
Is determined by the product of (a) and thus, determines uplink interference as
Figure BDA0003495206560000103
Interference on uplink>
Figure BDA0003495206560000104
After the minimization calculation, the uplink transmitting power P of the transmitting end of the D2D user pair can be obtained j 。
In some embodiments, each of the uplink cellular users satisfies constraints of minimum quality of service and maximum transmit power, comprising:
The minimum service quality is met by each cellular user, specifically, the numerical value of the transmission quality index of the cellular user is larger than or equal to a first transmission quality threshold value;
and each cellular user satisfies a maximum transmission power, specifically, the transmission power of the cellular user is smaller than or equal to a first power threshold.
The final objective of the present application is to resource-share as many D2D user pairs as possible with the network model so that they can work on the same spectrum as cellular users, thus determining the objective optimization problem as maximizing the number of shared D2D user pairs, while each of the cellular users in the uplink cellular users meets the constraints of minimum quality of service and maximum transmit power. The minimum service quality is specifically that the value of the transmission quality index of the cellular user is greater than or equal to a first transmission quality threshold value. Each communication node has maximum transmitting power limitation, and the maximum transmitting power is met by the cellular user, specifically, the transmitting power of the cellular user is smaller than or equal to a first power threshold.
In some embodiments, the transmission quality indicator of the cellular user is a signal-to-interference-and-noise ratio of the cellular user, where the signal-to-interference-and-noise ratio of the cellular user is specifically shown in formula (6), and the first transmission quality threshold is a first signal-to-interference-and-noise ratio threshold.
In some embodiments, the D2D user constraint on meeting minimum quality of service and maximum transmit power of the uplink cellular user and D2D link comprises:
the minimum service quality of the D2D user pair meeting the uplink cellular user and the D2D link is that the value of the transmission quality index of the D2D user pair is larger than or equal to a second transmission quality threshold value;
the constraint condition that the D2D user pair meets the maximum transmission power is specifically that the transmission power of the transmitting end of the D2D user pair is less than or equal to a second power threshold.
In some embodiments, the transmission quality index of the D2D user pair is a signal-to-interference-and-noise ratio of a receiving end of the D2D user pair, where the signal-to-interference-and-noise ratio of the receiving end of the D2D user pair
Figure BDA0003495206560000111
Specifically as shown in formula (7). At this time, the second transmission quality threshold is a second signal-to-interference-and-noise ratio threshold.
Specifically, considering that the cellular user and the D2D user pair both have the lowest signal-to-interference-and-noise ratio, and the D2D user pair has the maximum transmit power constraint, the maximization of the shared D2D user pair will be converted into the optimization problem limited by the requirements of the cellular and D2D users on the communication service quality, which can be expressed as follows:
Figure BDA0003495206560000112
Figure BDA0003495206560000113
Figure BDA0003495206560000114
0≤P j ≤P max ，j＝1，...，M (8d)
equation (8 a) represents that the sum of uplink transmission power of MU-MIMO transmission cellular users and uplink interference of a plurality of D2D user pairs is minimized, equation (8 b) represents the signal-to-interference-and-noise ratio constraint of the cellular users, and equation (8 c) represents the signal-to-interference-and-noise ratio constraint of the D2D user pairs, wherein
Figure BDA0003495206560000115
and />
Figure BDA0003495206560000116
A first signal-to-noise ratio threshold and a second signal-to-noise ratio threshold representing a cellular user and a D2D user pair, and equation (8D) represents a constraint range of uplink transmission power of the D2D user pair, P max Is a second power threshold for the D2D user pair.
According to the step of S102, with the goal of maximizing the total communication capacity of each group of MU-MIMO transmission cellular users, calculating the power allocation of each group of MU-MIMO transmission cellular users by a convex optimization algorithm, and selecting a group of cellular users with the smallest total transmission power for uplink communication with the base station.
In response to determining that the maximum interference factor of the D2D user sharing the network model to the cellular user is in equation (6)
Figure BDA0003495206560000117
And the transmit power of the upstream cellular users has been fixed, the objective optimization problem of equation (8 a) is translated into +.>
Figure BDA0003495206560000118
The sharing sequence of the D2D user pair is selected by taking the product sum as a minimum as a target, and an optimization model is constructed as follows:
Figure BDA0003495206560000119
wherein ,Pj For the transmit power of the D2D user pair,
Figure BDA00034952065600001110
transmitting terminal D for D2D user Tj Channel gain to base station B, j=1, …, M is the number of D2D user pairs shared into the cellular network.
In the embodiment, solving the problem of maximizing the logarithm of shared D2D users is converted into
Figure BDA00034952065600001111
D2D user-shared sequence selection is carried out by taking the product sum of the D2D user as the minimum target, and the optimization problem solved by an optimization model which can be rewritten as a formula (9) is solved by solving the target optimization problem (8 a) for maximizing the sharing quantity of the D2D user, namely, the optimization problem is solved after the optimization model is built
Figure BDA0003495206560000121
And (3) solving the least-squares sum, and determining the uplink transmission power of each D2D user pair with the shared resource.
It should be noted that, the method of the embodiments of the present application may be performed by a single device, for example, a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present application, and the devices may interact with each other to complete the methods.
It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Based on the same inventive concept, the application also provides an uplink resource sharing device for cellular network and D2D communication, which corresponds to the method of any embodiment.
Referring to fig. 3, the uplink resource sharing device for D2D communication in the cellular network includes:
a model building module 301, configured to build a cellular D2D resource sharing network model, where the network model includes a base station configured with multiple antennas, multiple cellular users configured with single antennas, and multiple sets of D2D user pairs, where the cellular users communicate with the base station through a multiple-input multiple-output MU-MIMO manner, and multiple sets of D2D users communicate with uplink cellular users of the multiple cellular users using the same spectrum resources;
an uplink cellular user determining module 302, configured to group a plurality of cellular users in a cellular uplink communication, and respectively calculate a transmission power of each of the cellular users in each group, with a goal of maximizing a total communication rate, and use a group of cellular users with a minimum total transmission power as the uplink cellular users, where each of the cellular users in the uplink cellular users meets constraint conditions of a minimum service quality and a maximum transmission power;
A D2D user-to-resource sharing module 303, configured to calculate a transmission power of each group of the D2D user pairs with minimum interference of the D2D user pairs to the uplink cellular user as an optimization target, and select one D2D user pair with minimum transmission power to perform resource sharing with the uplink cellular user, where the D2D user pair meets a constraint condition of minimum service quality and maximum transmission power of the uplink cellular user and D2D link;
performing the following operation on each group of the D2D user pairs of all the remaining D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting one D2D user pair with the minimum transmission power as the D2D user pair to be resource-shared and the uplink cellular user,
until all of the D2D pairs complete resource sharing or all of the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints for the uplink cellular users and D2D links
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present application.
The device of the foregoing embodiment is configured to implement a D2D pair sharing order selecting method of a multi-user sharing system according to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Based on the same inventive concept, the application also provides an electronic device corresponding to the method of any embodiment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the uplink resource sharing method of the cellular network and the D2D communication according to any embodiment when executing the program.
Fig. 4 shows a more specific hardware architecture of an electronic device according to this embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), microprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present specification are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown in the figure) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.
The electronic device of the foregoing embodiment is configured to implement an uplink resource sharing method for cellular network and D2D communication according to any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
Based on the same inventive concept, corresponding to the method of any embodiment, the application further provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform an uplink resource sharing method of cellular network and D2D communication according to any embodiment.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The computer instructions stored in the storage medium of the foregoing embodiments are configured to cause the computer to perform an uplink resource sharing method for cellular network and D2D communication according to any one of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which are not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and/or the like which are within the spirit and principles of the embodiments are intended to be included within the scope of the present application.

Claims (10)

1. A method for uplink resource sharing of a cellular network and D2D communication, comprising:
constructing a cellular D2D resource sharing network model, wherein the network model comprises a base station with multiple configured antennas, a plurality of cellular users with single configured antennas and a plurality of groups of D2D user pairs, the cellular users communicate with the base station in a multi-input multi-output MU-MIMO mode, and the plurality of groups of D2D users communicate with uplink cellular users in the plurality of cellular users by using the same frequency spectrum resources;
In the cellular uplink communication, grouping a plurality of cellular users, and respectively calculating the transmission power of each of the cellular users in each group with the aim of maximizing the total communication rate, wherein a group of cellular users with the minimum total transmission power is taken as the uplink cellular users, and meanwhile, each of the cellular users in the uplink cellular users meets the constraint conditions of the minimum service quality and the maximum transmission power;
taking the minimum interference of the D2D user to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs, selecting a group of the D2D user pairs with the minimum transmission power to carry out resource sharing with the uplink cellular user, wherein the D2D user pairs meet the constraint conditions of the minimum service quality and the maximum transmission power of the uplink cellular user and a D2D link;
performing the following operation on each group of the D2D user pairs of all the remaining D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting one D2D user pair with the minimum transmission power as the D2D user pair to be resource-shared and the uplink cellular user,
Until all the D2D pairs complete resource sharing or all the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints of the uplink cellular users and D2D links.
2. The method according to claim 1, wherein the network model specifically comprises: the system comprises a single cell model or a multi-cell model formed by a plurality of single cell models, wherein the single cell model comprises a base station positioned in the center of the single cell model, a plurality of cellular users and a plurality of groups of D2D user pairs, each D2D user pair comprises a transmitting end and a receiving end, the cellular users perform uplink resource sharing transmission in a multi-user MIMO mode, and signal interference among the plurality of cellular users is eliminated through a preset method.
3. The method of claim 1, wherein the calculating the transmit power for each set of the D2D user pairs with the D2D user's minimum interference to the uplink cellular user as an optimization objective comprises:
determining the interference as based on an interference environment of the network model
Figure FDA0004182456300000021
wherein ,Pj Transmit power for said D2D user pair,/->
Figure FDA0004182456300000022
Transmitting terminal D for the D2D user pair Tj Channel gains to the base station B, j being the index of the j-th D2D user pair, the channel gains including equivalent channel gains after large-scale and small-scale fading;
by interfering with the interference
Figure FDA0004182456300000023
Performing minimization calculation to obtain a transmitting end D of each group of the D2D user pairs Tj Is set to be equal to the transmission power P of (2) j 。
4. The method of claim 1, wherein each of the uplink cellular users satisfies constraints of a minimum quality of service and a maximum transmit power, comprising:
the minimum service quality is met by each cellular user, specifically, the numerical value of the transmission quality index of the cellular user is larger than or equal to a first transmission quality threshold value;
and each cellular user satisfies a maximum transmission power, specifically, the transmission power of the cellular user is smaller than or equal to a first power threshold.
5. The method according to claim 4, wherein the transmission quality indicator of the cellular user is a signal-to-interference-and-noise ratio of the cellular user, in particular
Figure FDA0004182456300000024
wherein ,
Figure FDA0004182456300000025
transmit power for cellular subscriber, +.>
Figure FDA0004182456300000026
For cellular subscriber C i Channel gain to base station B, i=1, …, N is the number of uplink cellular users in the cellular network, P j Transmit power for said D2D user pair,/->
Figure FDA0004182456300000027
Transmitting terminal D for the D2D user pair Tj Channel gain to base station B, j being the index of the j-th D2D user pair, j=1, …, M being the number of D2D user pairs shared with the network model resource,/>
Figure FDA0004182456300000028
Is zero-mean complex Gaussian noise power at the base station side.
6. The method of claim 1, wherein the D2D user constraint on meeting a minimum quality of service and a maximum transmit power of the uplink cellular user and D2D link comprises:
the minimum service quality of the D2D user pair meeting the uplink cellular user and the D2D link is that the value of the transmission quality index of the D2D user pair is larger than or equal to a second transmission quality threshold value;
the constraint condition that the D2D user pair meets the maximum transmission power is specifically that the transmission power of the transmitting end of the D2D user pair is less than or equal to a second power threshold.
7. The method of claim 6, wherein the transmission quality indicator of the D2D user pair is a signal-to-interference-and-noise ratio of a receiving end of the D2D user pair, the signal-to-interference-and-noise ratio of the receiving end of the D2D user pair
Figure FDA0004182456300000031
The concrete steps are as follows:
Figure FDA0004182456300000032
wherein ,
Figure FDA0004182456300000033
for the transmission power of the cellular users, i=1, …, N is the number of uplink cellular users in the cellular network, P j For the j-th D2D user pair, j=1, …, M is the number of D2D user pairs shared with the network model resource,/-j #>
Figure FDA0004182456300000034
For the j-th D2D user pair transmitting terminal D Tj To receiving end D Rj Channel gain, P of m The transmission power for the mth D2D user pair, wherein m is equal to j,>
Figure FDA0004182456300000035
transmitting terminal D for mth D2D user pair Tm To the firstReceiving end D of j D2D user pairs Rj Channel gain of>
Figure FDA0004182456300000036
For the cellular subscriber C i Receiving end D to j-th D2D user pair Rj Channel gain of>
Figure FDA0004182456300000037
Zero-mean complex gaussian noise power for the opposite side of the D2D user.
8. An uplink resource sharing apparatus for cellular network and D2D communication, comprising:
a model building module configured to build a cellular D2D resource sharing network model, where the network model includes a base station configured with multiple antennas, multiple cellular users configured with single antennas, and multiple sets of D2D user pairs, where the cellular users communicate with the base station through a multiple-input multiple-output MU-MIMO manner, and multiple sets of D2D users communicate with uplink cellular users of the multiple cellular users using the same spectrum resources;
an uplink cellular user determining module, configured to group a plurality of cellular users in cellular uplink communication, and respectively calculate a transmission power of each of the cellular users in each group, with a goal of maximizing a total communication rate, and take a group of cellular users with a minimum total transmission power as the uplink cellular users, where each of the cellular users in the uplink cellular users meets constraint conditions of a minimum service quality and a maximum transmission power;
A D2D user-to-resource sharing module configured to calculate a transmission power of each group of the D2D user pairs with minimum interference of the D2D user pair to the uplink cellular user as an optimization target, and select one D2D user pair with minimum transmission power to perform resource sharing with the uplink cellular user, where the D2D user pair meets constraint conditions of minimum service quality and maximum transmission power of the uplink cellular user and D2D link;
performing the following operation on each group of the D2D user pairs of all the remaining D2D user pairs:
taking the minimum interference of all the D2D user pairs which have completed resource sharing and the D2D user pairs to be resource-shared to the uplink cellular user as an optimization target, calculating the transmission power of each group of the D2D user pairs in the rest all the D2D user pairs, selecting one D2D user pair with the minimum transmission power as the D2D user pair to be resource-shared and the uplink cellular user,
until all the D2D pairs complete resource sharing or all the D2D user pairs remain without the D2D pairs meeting minimum quality of service and maximum transmit power constraints of the uplink cellular users and D2D links.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, the processor implementing the method according to any one of claims 1 to 7 when the computer program is executed.
10. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 7.
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