CN111935833B - D2D communication in cellular network frequency spectrum multiplexing method of system - Google Patents
D2D communication in cellular network frequency spectrum multiplexing method of system Download PDFInfo
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- CN111935833B CN111935833B CN202010740197.8A CN202010740197A CN111935833B CN 111935833 B CN111935833 B CN 111935833B CN 202010740197 A CN202010740197 A CN 202010740197A CN 111935833 B CN111935833 B CN 111935833B
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- 230000001413 cellular effect Effects 0.000 title claims abstract description 67
- 238000001228 spectrum Methods 0.000 title claims abstract description 41
- 238000004891 communication Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000010267 cellular communication Effects 0.000 claims description 8
- 230000002452 interceptive effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 5
- 239000011229 interlayer Substances 0.000 abstract description 3
- 241001181114 Neta Species 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- 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
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- 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
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- 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
Abstract
The invention discloses a honeycomb netA spectrum multiplexing method of a D2D communication system in a network belongs to the technical field of communication. The invention comprises the following steps: step 1 if the distance between the D2D user and the serving base station of the cellular user satisfies a certain condition, D2D users may multiplex cellular user uplink spectrum resources; step 2, if the j-th pair D2D user D meeting the condition of step 1 j If there are multiple cellular users whose uplink spectrum resources can be multiplexed, then according to cellular user C i Interference metric value of (2)
Selecting a cellular user multiplexing spectrum resource which minimizes the interference metric value; step 3, if the kth pair D2D user D k With the j-th pair of D2D users D j The distance of (2) satisfies the condition described in the formula (5), then the D2D user D k With D2D user D j The spectrum resources of the same cellular user can be shared. The invention can effectively inhibit the inter-layer interference between the cellular user and the D2D user and the intra-layer interference between the D2D users, and improve the frequency spectrum utilization rate and the system energy efficiency.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for spectrum multiplexing in a D2D communications system in a cellular network, so as to suppress interference caused by spectrum multiplexing. The multiple access technique may be a multiple access technique such as frequency division multiple access (Frequency Division Multiple Access: FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access: OFDMA), or the like.
Background
In recent years, the mobile communication industry has undergone significant development and reform, and the fifth generation (5G) mobile communication technology has been put into commercial use. According to industry demand for 5G, 5G networks will have ultra-high transmission rates, higher spectral efficiency, lower transmission delays, and support connections for higher density devices. In order to achieve the wish and goal of 5G, 5G will employ a more flexible and intelligent network architecture and intelligent networking technology in terms of wireless networks. The ultra-dense heterogeneous network such as D2D transmission is added on the basis of the original macro cell, so that the network capacity can be effectively improved, the system coverage probability is increased, and the ultra-dense heterogeneous network has become one of the development directions of the network architecture of a future mobile communication system. In the D2D dense heterogeneous network, the frequency spectrum efficiency and the energy efficiency are improved due to the fact that the distance between the terminal devices is closer. However, this manner of spectrum sharing causes multiple interference problems between users in layers and users in layers, especially when the D2D user pairs are dense, serious uplink co-channel interference will occur to the cellular network users. How to mitigate such interference requires intensive research. A reasonable spectrum reuse strategy is one of the effective measures to mitigate inter-layer interference and intra-layer interference in such network architectures.
Therefore, in the present invention, a method for spectrum multiplexing of a D2D communication system in a cellular network is proposed.
Disclosure of Invention
The present invention is directed to a spectrum multiplexing method for a D2D communication system in a cellular network, wherein radio resources to be multiplexed may include: one or more dimensions of radio resources such as frequency, time slot, space, etc. The method can dynamically multiplex spectrum resources according to information such as useful signal intensity, interference intensity and the like in the system, and can inhibit intra-layer interference and inter-layer interference caused by wireless resource sharing to users.
The technical scheme adopted by the invention for solving the technical problems comprises the following steps:
step 1, if the D2D user satisfies the following conditions, the D2D user may multiplex uplink spectrum resources of the cellular user, that is:
d 0 >f -1 (beta); formula (1)
wherein ：d0 Is the distance between the D2D user and the serving base station of the cellular user,
representing cellular subscriber C i To the j-th pair of D2D users D j Distance of receiving end,/->
Representing cellular subscriber C i Distance to its serving base station; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal-to-interference-and-noise ratio of the D2D communication system is determined according to the system requirement; epsilon is the ratio of the uplink transmitting power of the cellular user to the transmitting power of the D2D transmitting end, lambda d The density of the D2D users is M, the number of uplink spectrums available to the cellular system is M, B is a signal-to-interference-and-noise ratio threshold, and beta is a coverage probability threshold required by the cellular communication system; θ is a path loss index in the D2D communication system; alpha is the path loss index in the cellular communication system; r is R C A coverage radius for a cell;
step 2, if the j-th pair D2D user D meeting the condition of step 1 j If there are multiple cellular users whose uplink spectrum resources can be multiplexed, then according to cellular user C i Interference metric value of (2)
Selecting a cellular user multiplexing spectrum resource that minimizes the interference metric, interference metric +.>
Is calculated as follows:
wherein ,
transmitting end to cellular user C representing j-th pair of D2D users i Distance of the serving base station,/-, of>
Representing beesInterference signal received by cellular user and useful signal energy ratio, +.>
Representing the ratio of the interference signal received by the D2D user to the useful signal energy.
Step 3, if the kth pair D2D user D k With the j-th pair of D2D users D j The distance of (2) satisfies the condition described in the formula (5), then the D2D user D k With D2D user D j The spectrum resources of the same cellular user can be shared; the specific conditions are as follows:
wherein 
Representing the kth pair of D2D users D k Transmitting end to j-th pair of D2D users D j Distance of the receiving end; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal to interference plus noise ratio of the D2D communication system is determined according to the system requirement.
The invention has the following beneficial effects:
the invention can effectively restrain the interference caused by the multiplexing of the wireless resources, in particular co-channel interference; the spectrum utilization rate can be improved, and the system coverage probability can be improved; and simultaneously, the service quality of the user is improved.
Drawings
Fig. 1 is an embodiment of the present invention.
The system model of D2D communication in cellular network is specifically disclosed, wherein the figure comprises 1 macro base station of cellular network and several D2D user pairs distributed randomly.
Detailed Description
According to the basic concept of the invention, when wireless resources are allocated to D2D users in a cellular network, a distance threshold value capable of multiplexing the wireless resources among the users is firstly determined, then the wireless resources are allowed to be multiplexed among the users meeting the distance threshold value, and if a plurality of wireless resources can be multiplexed, the optimal one is selected according to the interference metric value. As shown in fig. 1, a spectrum multiplexing method for a D2D communication system in a cellular network according to the present invention includes the following specific steps:
step 1, if the D2D user satisfies the following conditions, the D2D user may multiplex uplink spectrum resources of the cellular user, that is:
d 0 >f -1 (beta); formula (1)
wherein ：d0 Is the distance between the D2D user and the serving base station of the cellular user,
representing cellular subscriber C i To the j-th pair of D2D users D j The distance between the receiving ends of the two optical fibers, and (2)>
Representing cellular subscriber C i Distance to its serving base station; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d For the signal-to-interference-and-noise ratio threshold value of the D2D communication system, depending on the system requirements; epsilon is the ratio of the uplink transmitting power of the cellular user to the transmitting power of the D2D transmitting end, lambda d The density of the D2D users is M, the number of uplink spectrums available to the cellular system is M, B is a signal-to-interference-and-noise ratio threshold, and beta is a coverage probability threshold required by the cellular communication system; θ is a path loss index in the D2D communication system; alpha is the path loss index in the cellular communication system; r is R C A coverage radius for a cell;
step 2, if the j-th pair D2D user D meeting the condition of step 1 j Uplink spectrum resources of a plurality of cellular users can be multiplexed, and then the method is based on beesCellular user C i Interference metric value of (2)
Selecting a cellular user multiplexing spectrum resource that minimizes the interference metric, interference metric +.>
Is calculated as follows:
wherein ,
transmitting end to cellular user C representing j-th pair of D2D users i Distance of the serving base station,/-, of>
Representing the ratio of the interference signal received by the cellular subscriber to the useful signal energy,/for the cellular subscriber>
Representing the ratio of the interference signal received by the D2D user to the useful signal energy;
step 3, if the kth pair D2D user D k With the j-th pair of D2D users D j The distance of (2) satisfies the condition described in the formula (5), then the D2D user D k With D2D user D j The spectrum resources of the same cellular user can be shared; the specific conditions are as follows:
wherein 
Representing the kth pair of D2D users D k Transmitting end to j-th pair of D2D users D j Distance of the receiving end; r is R D Represents a pair of D2D, the distance between the user transmitting end and the user receiving end; mu (mu) d The threshold value of the signal to interference plus noise ratio of the D2D communication system is determined according to the system requirement. .
The types and the transmitting powers of the base stations in the invention can be the same or different, and the coverage area of the base stations can be coverage areas of any shape, including cells. And the threshold value and the coverage probability requirement of the system can be determined according to the actual requirement of the system, and the threshold value of each user can be the same or different.
Example 1:
a spectrum multiplexing method of a D2D communication system in a cellular network according to the present invention will be described with reference to the accompanying drawings in combination with a preferred embodiment of the present invention.
Referring to fig. 1, in the present invention, a method for multiplexing frequency resources of a D2D communication system of a single cell cellular network is provided to suppress co-channel interference caused by frequency multiplexing. The wireless resource allocation of the multi-cell users can be designed according to the method provided by the invention, so that the problem of interference suppression of the multi-cell users is solved.
Step 1, if the D2D user satisfies the following conditions, the uplink spectrum resources of the cellular user can be multiplexed, that is
d 0 >f -1 (beta); formula (1)
wherein ：d0 Is the distance between the D2D user and the serving base station of the cellular user,
representing cellular subscriber C i To the j-th pair of D2D users D j Distance of receiving end,/->
Representing the distance of a cellular subscriber to its serving base station; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal-to-interference-and-noise ratio of the D2D communication system is determined according to the system requirement; epsilon is the ratio of the uplink transmitting power of the cellular user to the transmitting power of the D2D transmitting end, lambda d The density of the D2D users is M, the number of uplink spectrums available to the cellular system is M, B is a signal-to-interference-and-noise ratio threshold, and beta is a coverage probability threshold required by the cellular communication system; θ is in D2D communication system is a path loss index of (2); alpha is the path loss index in the cellular communication system; r is R C A coverage radius for a cell;
for example in FIG. 1, D 2 Satisfy C 1 But does not meet C 2 Interference limitation of (D), thus D 2 Can be combined with C 1 Multiplexing resources with C 2 Different radio resources are used.
Step 2, if the kth pair of D2D users (denoted D k ) With the j-th pair of D2D users (denoted as D j ) Sharing spectrum resources requires the following conditions to be satisfied:
wherein 
Representing the distance from the transmitting end of the kth pair of D2D users to the receiving end of the jth pair of D2D users; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal to interference plus noise ratio of the system is determined according to the system requirement; for example in FIG. 1, D 2 And D 4 The distance of (2) does not meet the interference constraint and therefore it is necessary to allocate different resources thereto.
Step 3, if the j-th pair of D2D users (denoted as D j ) Uplink spectrum resources with multiple cellular users can be multiplexed, e.g. D in fig. 1 1 At the same time satisfy C 1 、C 2 According to interference limitation of (2)
Selecting the cellular user multiplexing frequency spectrum resource which makes the interference metric value maximum; wherein (1)>
Transmitting end to cellular user C representing j-th pair of D2D users i Is a distance of the serving base station.
The types and the transmitting powers of the base stations in the invention can be the same or different, and the coverage area of the base stations can be coverage areas of any shape, including cells. And the threshold value and the coverage probability requirement of the system can be determined according to the actual requirement of the system, and the threshold value of each user can be the same or different.
Claims (2)
1. A method for spectrum multiplexing of a D2D communication system in a cellular network, comprising the steps of:
step 1, if the D2D user satisfies the following conditions, the D2D user may multiplex uplink spectrum resources of the cellular user, that is:
d 0 ＞f -1 (beta); formula (1)
wherein ：d0 Is the distance between the D2D user and the serving base station of the cellular user,
representing cellular subscriber C i To the j-th pair of D2D users D j Distance of receiving end,/->
Representing cellular subscriber C i Distance to its serving base station; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal-to-interference-and-noise ratio of the D2D communication system is determined according to the system requirement; epsilon is the ratio of the uplink transmitting power of the cellular user to the transmitting power of the D2D transmitting end, lambda d The density of the D2D users is M, the number of uplink spectrums available to the cellular system is M, B is a signal-to-interference-and-noise ratio threshold, and beta is a coverage probability threshold required by the cellular communication system; θ is a path loss index in the D2D communication system; alpha is the path loss index in the cellular communication system; r is R C A coverage radius for a cell;
step 2, if the j-th pair D2D user D meeting the condition of step 1 j If there are multiple cellular users whose uplink spectrum resources can be multiplexed, then according to cellular user C i Interference metric value of (2)
Selecting a cellular user multiplexing spectrum resource that minimizes the interference metric, interference metric +.>
Is calculated as follows:
wherein ,
transmitting end to cellular user C representing j-th pair of D2D users i Distance of the serving base station,/-, of>
Representing the ratio of the interference signal received by the cellular subscriber to the useful signal energy,/for the cellular subscriber>
Representing D2D usersThe ratio of the received interfering signal to the useful signal energy.
2. The method for spectrum multiplexing of D2D communication system in cellular network according to claim 1, further comprising a technical feature step 3, if the kth pair of D2D users D k With the j-th pair of D2D users D j The distance of (2) satisfies the condition described in the formula (5), then the D2D user D k With D2D user D j The spectrum resources of the same cellular user can be shared; the specific conditions are as follows:
wherein 
Representing the kth pair of D2D users D k Transmitting end to j-th pair of D2D users D j Distance of the receiving end; r is R D Representing the distance between a pair of D2D user transmitting ends and receiving ends; mu (mu) d The threshold value of the signal to interference plus noise ratio of the D2D communication system is determined according to the system requirement. />
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Effective date of registration: 20240313 Address after: No. 2-1002, No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province, 310051 Patentee after: Hangzhou Puwei cloud Technology Co.,Ltd. Guo jiahuodiqu after: China Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University Guo jiahuodiqu before: China |