CN111935833A - Spectrum multiplexing method of D2D communication system in cellular network - Google Patents

Spectrum multiplexing method of D2D communication system in cellular network Download PDF

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CN111935833A
CN111935833A CN202010740197.8A CN202010740197A CN111935833A CN 111935833 A CN111935833 A CN 111935833A CN 202010740197 A CN202010740197 A CN 202010740197A CN 111935833 A CN111935833 A CN 111935833A
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CN111935833B (en
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许方敏
邹鹏凯
吕梦文
王海泉
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Hangzhou Puwei Cloud Technology Co ltd
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Hangzhou Dianzi University
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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
    • 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 invention discloses a frequency spectrum multiplexing method of a D2D communication system in a cellular network, belonging to the technical field of communication. The invention comprises the following steps: step 1, if the distance between the D2D user and the service base station of the cellular user meets a certain condition, the D2D user can multiplex the cellular user uplink frequency spectrum resource; step 2, if the j-th pair D2D users D meeting the condition of step 1jThe uplink frequency spectrum resources of a plurality of cellular users can be reused according to the cellular user CiInterference metric of
Figure DDA0002606480860000011
Selecting the cellular user multiplexing frequency spectrum resource which enables the interference metric value to be minimum; step 3, if the k pair D2D is user DkTo the j-th pair D2D user DjD2D user D if the distance satisfies the condition of equation (5)kAnd D2D user DjCan share the same cellSpectrum resources of the user. The invention can effectively inhibit the interlayer interference between the cellular users and the D2D users and the interlayer interference between the D2D users, and improve the frequency spectrum utilization rate and the system energy efficiency.

Description

Spectrum multiplexing method of D2D communication system in cellular network
Technical Field
The invention relates to the technical field of communication, in particular to a frequency spectrum multiplexing method of a D2D communication system in a cellular network, which aims to suppress the interference problem caused by frequency spectrum multiplexing. The Multiple Access technology may be Multiple Access technologies such as Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and the like.
Background
In recent years, the mobile communication industry has experienced a significant development and reform period, and fifth generation (5G) mobile communication technology has been continuously put into commercial use. According to the industry boundary demand for 5G, a 5G network will have an ultra-high transmission rate, higher spectral efficiency, lower transmission delay, and support for connection of higher density devices. To achieve the vision and goals of 5G, 5G will employ more flexible, intelligent network architectures and intelligent networking technologies in terms of wireless networking. In which, an ultra-dense heterogeneous network such as D2D transmission is added on the basis of the original macro cell, which can effectively improve the network capacity and increase the system coverage probability, and has become one of the development directions of the network architecture of the future mobile communication system. In the D2D dense heterogeneous network, the closer distance between the terminal devices brings the improvement of spectral efficiency and energy efficiency. However, this spectrum sharing method causes various interference problems between the inter-layer users and the intra-layer users, and especially when the D2D user pairs are dense, serious uplink co-channel interference will be generated to the cellular network users. How to mitigate this interference requires intensive research. A reasonable spectrum reuse strategy is one of the effective measures to mitigate the inter-layer interference and the intra-layer interference in such a network architecture.
Therefore, in the present invention, a spectrum multiplexing method for a D2D communication system in a cellular network is proposed.
Disclosure of Invention
The invention aims to provide a spectrum multiplexing method of a D2D communication system in a cellular network, wherein the radio resources for multiplexing can comprise: frequency, time slot, space, and other one-dimensional or multi-dimensional radio resources. The method can dynamically multiplex spectrum resources according to the information of useful signal intensity, interference intensity and the like in the system, and inhibit the problems of intra-layer interference and inter-layer interference brought to users by wireless resource sharing.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
step 1, if the D2D users satisfy the following conditions, the D2D users can multiplex cellular user uplink spectrum resources, that is:
d0>f-1(β); formula (1)
Figure BDA0002606480840000011
Figure BDA0002606480840000012
wherein ：d0Is the distance between the D2D user and the serving base station of the cellular user,
Figure BDA0002606480840000013
representing cellular user CiTo j-th pair D2D, user DjThe distance between the receiving ends is,
Figure BDA0002606480840000014
representing cellular user CiDistance to its serving base station; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold value of the D2D communication system is determined according to the system requirements; is the ratio of the uplink transmission power of the cellular user and the transmission power of the D2D transmitting end, lambdadThe density of D2D users, M is the number of available uplink frequency spectrums of the cellular system, B is the signal-to-interference-and-noise ratio threshold, and beta is the coverage probability threshold value required by the cellular communication system; θ is the path loss exponent in the D2D communication system; α is a path loss exponent in the cellular communication system; rCIs the coverage radius of the cell;
step 2, if the j-th pair D2D users D meeting the condition of step 1jThe uplink frequency spectrum resources of a plurality of cellular users can be reused according to the cellular user CiInterference metric of
Figure BDA0002606480840000021
Selecting the cellular user's multiplexed spectrum resource that minimizes the interference metric value
Figure BDA0002606480840000022
Is calculated as follows:
Figure BDA0002606480840000023
wherein ,
Figure BDA0002606480840000024
sender-to-cellular user C representing j-th pair D2D usersiThe distance of the serving base station of (c),
Figure BDA0002606480840000025
representing the ratio of the interference signal received by the cellular user to the useful signal energy,
Figure BDA0002606480840000026
representing the ratio of the interference signal received by the D2D user to the energy of the desired signal.
Step 3, if the k pair D2D is user DkTo the j-th pair D2D user DjD2D user D if the distance satisfies the condition of equation (5)kAnd D2D user DjSpectrum resources of the same cellular user can be shared; the specific conditions are as follows:
Figure BDA0002606480840000027
wherein
Figure BDA0002606480840000028
Representing the k-th pair D2D of user DkTransmit to jth pair D2D user DjThe distance of the receiving end; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdSignal-to-interference-and-noise ratio (SINR) gate for D2D communication systemThe limit value depends on the system requirements.
The invention has the following beneficial effects:
the invention can effectively inhibit the interference caused by the reuse of wireless resources, in particular to the same frequency interference; the frequency spectrum utilization rate can be improved, and the system coverage probability is improved; and simultaneously, the service quality of the user is improved.
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FIG. 1 is an embodiment of the present invention.
Specifically, the system model of D2D communication in a cellular network is shown as having 1 macro base station of the cellular network and a plurality of randomly distributed D2D user pairs.
Detailed Description
According to the basic idea of the invention, when allocating radio resources for D2D users in a cellular network, a distance threshold value for multiplexing radio resources among users is first determined, then the multiplexing of radio resources among users satisfying the distance threshold value is allowed, if there are multiple radio resources that can be multiplexed, the optimal one is selected according to the interference metric value. As shown in fig. 1, the spectrum multiplexing method of the D2D communication system in the cellular network according to the present invention includes the following specific steps:
step 1, if the D2D users satisfy the following conditions, the D2D users can multiplex cellular user uplink spectrum resources, that is:
d0>f-1(β); formula (1)
Figure BDA0002606480840000031
Figure BDA0002606480840000032
wherein ：d0Is the distance between the D2D user and the serving base station of the cellular user,
Figure BDA0002606480840000033
representing cellular user CiTo j-th pair D2D, user DjThe distance between the receiving ends is,
Figure BDA0002606480840000034
representing cellular user CiDistance to its serving base station; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold value of the D2D communication system is determined according to the system requirements; is the ratio of the uplink transmission power of the cellular user and the transmission power of the D2D transmitting end, lambdadThe density of D2D users, M is the number of available uplink frequency spectrums of the cellular system, B is the signal-to-interference-and-noise ratio threshold, and beta is the coverage probability threshold value required by the cellular communication system; θ is the path loss exponent in the D2D communication system; α is a path loss exponent in the cellular communication system; rCIs the coverage radius of the cell;
step 2, if the j-th pair D2D users D meeting the condition of step 1jThe uplink frequency spectrum resources of a plurality of cellular users can be reused according to the cellular user CiInterference metric of
Figure BDA0002606480840000035
Selecting the cellular user's multiplexed spectrum resource that minimizes the interference metric value
Figure BDA0002606480840000036
Is calculated as follows:
Figure BDA0002606480840000037
wherein ,
Figure BDA0002606480840000038
sender-to-cellular user C representing j-th pair D2D usersiThe distance of the serving base station of (c),
Figure BDA0002606480840000039
representing the ratio of the interference signal received by the cellular user to the useful signal energy,
Figure BDA00026064808400000310
representing the ratio of the interference signal received by the D2D user to the energy of the useful signal;
step 3, if the k pair D2D is user DkTo the j-th pair D2D user DjD2D user D if the distance satisfies the condition of equation (5)kAnd D2D user DjSpectrum resources of the same cellular user can be shared; the specific conditions are as follows:
Figure BDA00026064808400000311
wherein
Figure BDA00026064808400000312
Representing the k-th pair D2D of user DkTransmit to jth pair D2D user DjThe distance of the receiving end; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold for the D2D communication system depends on the system requirements. .
The base station types and the transmitting power in the invention can be the same or different, and the coverage area of the base station can be any shape of coverage area, including a cell. 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:
the spectrum reuse method of the D2D communication system in a cellular network according to the present invention is described below with reference to the accompanying drawings and in conjunction with the preferred embodiments of the present invention.
Referring to fig. 1, the frequency resource reuse method of the single-cell cellular network D2D communication system in the present invention is to suppress the co-channel interference problem caused by frequency reuse. The method can be used for designing the wireless resource allocation of multi-cell users, thereby solving the problem of interference suppression of multi-cells.
Step 1, if the D2D user meets the following conditions, the uplink spectrum resource of the cellular user can be multiplexed, that is, the uplink spectrum resource of the cellular user can be multiplexed
d0>f-1(β); formula (1)
Figure BDA0002606480840000041
Figure BDA0002606480840000042
wherein ：d0Is the distance between the D2D user and the serving base station of the cellular user,
Figure BDA0002606480840000043
representing cellular user CiTo j-th pair D2D, user DjThe distance between the receiving ends is,
Figure BDA0002606480840000044
represents the distance of a cellular user from its serving base station; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold value of the D2D communication system is determined according to the system requirements; is the ratio of the uplink transmission power of the cellular user and the transmission power of the D2D transmitting end, lambdadThe density of D2D users, M is the number of available uplink frequency spectrums of the cellular system, B is the signal-to-interference-and-noise ratio threshold, and beta is the coverage probability threshold value required by the cellular communication system; θ is the path loss exponent in the D2D communication system; α is a path loss exponent in the cellular communication system; rCIs the coverage radius of the cell;
for example, in FIG. 1, D2Satisfies C1Does not satisfy C2Is limited by interference, thus D2Can be reacted with C1Multiplex resources with C2Different radio resources are used.
Step 2, if the k is the D2D user (marked as D)k) For the j-th pair D2D users (noted as Dj) Sharing spectrum resources, the following conditions need to be satisfied:
Figure BDA0002606480840000045
wherein
Figure BDA0002606480840000046
Represents the distance from the sender of the kth pair of D2D users to the receiver of the jth pair of D2D users; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe 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, D2And D4Does not satisfy the interference limitation condition and thus needs to be allocated with different resources.
Step 3, if the j is the D2D user (marked as D)j) Uplink spectrum resources with multiple cellular users may be multiplexed, e.g. in fig. 1, D1Simultaneously satisfy C1、C2Is limited according to
Figure BDA0002606480840000047
Selecting the cellular user multiplexing frequency spectrum resource which enables the interference metric value to be maximum; wherein,
Figure BDA0002606480840000048
sender-to-cellular user C representing j-th pair D2D usersiThe serving base station.
The base station types and the transmitting power in the invention can be the same or different, and the coverage area of the base station can be any shape of coverage area, including a cell. 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 multiplexing spectrum of a D2D communication system in a cellular network, comprising the steps of:
step 1, if the D2D users satisfy the following conditions, the D2D users can multiplex cellular user uplink spectrum resources, that is:
d0＞f-1(β); formula (1)
Figure FDA0002606480830000011
Figure FDA0002606480830000012
wherein ：d0Is the distance between the D2D user and the serving base station of the cellular user,
Figure FDA0002606480830000013
representing cellular user CiTo j-th pair D2D, user DjThe distance between the receiving ends is,
Figure FDA0002606480830000014
representing cellular user CiDistance to its serving base station; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold value of the D2D communication system is determined according to the system requirements; is the ratio of the uplink transmission power of the cellular user and the transmission power of the D2D transmitting end, lambdadThe density of D2D users, M is the number of available uplink frequency spectrums of the cellular system, B is the signal-to-interference-and-noise ratio threshold, and beta is the coverage probability threshold value required by the cellular communication system; θ is the path loss exponent in the D2D communication system; α is a path loss exponent in the cellular communication system; rCIs the coverage radius of the cell;
step 2, if the j-th pair D2D users D meeting the condition of step 1jThe uplink frequency spectrum resources of a plurality of cellular users can be reused according to the cellular user CiInterference metric of
Figure FDA0002606480830000015
Selecting the cellular user's multiplexed spectrum resource that minimizes the interference metric value
Figure FDA0002606480830000016
Is calculated as follows:
Figure FDA0002606480830000017
wherein ,
Figure FDA0002606480830000018
sender-to-cellular user C representing j-th pair D2D usersiThe distance of the serving base station of (c),
Figure FDA0002606480830000019
representing the ratio of the interference signal received by the cellular user to the useful signal energy,
Figure FDA00026064808300000110
representing the ratio of the interference signal received by the D2D user to the energy of the desired signal.
2. The method of claim 1 further comprising a technical characterization step 3, if the k-th pair of D2D users D are D, wherein the method further comprises a step of multiplexing the spectrum of the D2D communication system in the cellular networkkTo the j-th pair D2D user DjD2D user D if the distance satisfies the condition of equation (5)kAnd D2D user DjSpectrum resources of the same cellular user can be shared; the specific conditions are as follows:
Figure FDA00026064808300000111
wherein
Figure FDA00026064808300000112
Representing the k-th pair D2D of user DkTransmit to jth pair D2D user DjThe distance of the receiving end; rDRepresents the distance between the sending end and the receiving end of a pair of D2D users; mu.sdThe signal to interference plus noise ratio threshold for the D2D communication system depends on the system requirements.
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