CN108768484B - D2D pair access method based on beam forming and channel parallelism threshold value - Google Patents
D2D pair access method based on beam forming and channel parallelism threshold value Download PDFInfo
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- CN108768484B CN108768484B CN201810568332.8A CN201810568332A CN108768484B CN 108768484 B CN108768484 B CN 108768484B CN 201810568332 A CN201810568332 A CN 201810568332A CN 108768484 B CN108768484 B CN 108768484B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
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- 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
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
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- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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Abstract
The invention provides a D2D pair access method based on beam forming and a channel parallelism threshold, which selects a D2D pair to access a cellular network on the premise of meeting the requirement of a base station to the D2D pair channel parallelism threshold, thereby maximizing the system capacity; the method comprises the following steps: (1) initializing parameters; (2) initializing channel state information; (3) calculating a zero-forcing beamforming vector of a cellular user and system capacity; (4) D2D initializes the candidate set, selects all D2D pairs with parallelism greater than the threshold value to form a D2D pair candidate set; (5) D2D pair access judgment: for the D2D pairs within the D2D pair candidate set, assume that a certain D2D pair is accessed to the cellular network: if the system capacity increases, the D2D pair is allowed to access the cellular network; otherwise, the D2D pair is not allowed to access the cellular network; (6) and repeating the steps till the completion. The D2D pair access algorithm designed according to the channel parallelism principle can maximize the system capacity.
Description
Technical Field
The invention relates to a beam forming and channel parallelism threshold-based D2D pair access method capable of maximizing system capacity, and belongs to the wireless communication technology.
Background
Nowadays, wireless communication is widely applied in daily life and becomes an indispensable part of people's daily life. The demand of users for network bandwidth is higher and higher, and the amount of mobile data is increased explosively. To meet the increasing demands of users, D2D communication appears in the field of view of people and is being introduced into cellular communication.
D2D communication refers to establishing a communication link directly between two mobile terminal devices, as distinguished from conventional communication using a base station as a relay. When cellular users and D2D users in a cellular network share spectrum resources, the spectrum efficiency of the network can be effectively improved through effective interference management, resource allocation, mode selection and MIMO techniques. Among them, good interference management algorithms can improve the capacity of the system, and have attracted much attention.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides an access method of D2D pairs based on beam forming and a channel parallelism threshold, which performs joint zero-forcing beam forming on cellular users according to the redundancy of transmitting antennas of a base station so as to eliminate the interference between the cellular users and the interference of the base station on partial D2D pairs, and controls whether a D2D pair is accessed to a cellular network according to the channel parallelism principle, so that the system capacity is maximized.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a D2D pair access method based on beam forming and channel parallelism threshold value, using channel state information of base station to cellular user and partial D2D pair to make joint zero-forcing beam forming for cellular user; for the remaining D2D pairs, calculating parallelism between the channels from the base station to these D2D pairs and the channels from the base station to the D2D pairs participating in zero-forcing beamforming, selecting the D2D pairs with parallelism greater than the threshold to form a candidate set and initializing an access state vector; if the system capacity is increased after the D2D pair is accessed to the cellular network, the D2D pair is allowed to access the cellular network; then, judging the next pair of D2D pairs by using the same method until all the D2D pairs in the candidate set complete access judgment; the method specifically comprises the following steps:
(1) initializing parameters: initializing the number of transmitting antennas of a base station, the number of cellular users, the logarithm of D2D, the logarithm of D2D participating in zero-forcing beam forming, the logarithm of D2D not participating in zero-forcing beam forming, an access state vector, the transmitting power of the base station, the transmitting power of a D2D transmitter and a channel parallelism domain value;
(2) channel state information initialization: initializing channel gains of base station to cellular user, channel gains of base station to D2D receiver, channel gains of D2D transmitter to cellular user, channel gains of D2D transmitter to D2D receiver;
(3) calculating a zero-forcing beamforming vector of a cellular user and system capacity; in this process, since there are no D2D pairs to access the cellular network, the system capacity calculated at this time is only the sum of all cellular user rates and the D2D pairs of rates participating in zero-forcing beamforming;
(4) D2D initializes the candidate set: for the D2D pairs which do not participate in the zero-forcing beamforming, calculating the parallelism between the channels from the base station to the D2D pairs and the channels from the base station to the D2D pairs which participate in the zero-forcing beamforming, selecting all the D2D pairs with the parallelism larger than a threshold value to form a D2D pair candidate set, wherein the D2D pairs in the D2D pair candidate set are D2D pairs which are less interfered by the base station;
(5) D2D pair access judgment: for the D2D pairs within the D2D pair candidate set, assume that a certain D2D pair is accessed to the cellular network: if the system capacity increases, the D2D pair is allowed to access the cellular network; otherwise, the D2D pair is not allowed to access the cellular network; in the process, due to the addition of the D2D pair, not only all cellular user rates and the D2D pair rates participating in zero-forcing beamforming but also the newly added D2D pair rate, that is, the sum of all cellular user rates and all added D2D pair rates, need to be considered in calculating the system capacity;
(6) repeating until completion: consider the next pair of D2D and repeat step (5) until all pairs of D2D are considered.
Specifically, in the step (1), the channel parallelism threshold is a parallelism threshold between a channel from the base station to the D2D pair not participating in the zero-forcing beamforming and a channel from the base station to the D2D pair participating in the zero-forcing beamforming.
Specifically, in the step (3), the zero-forcing beamforming vector of the cellular user performs joint zero-forcing beamforming on the cellular user by using channel state information from the base station to the cellular user and the pair of the portion D2D according to the redundancy of the transmitting antenna of the base station.
Has the advantages that: the D2D pair access method based on beam forming and the channel parallelism threshold value controls whether the D2D pair accesses the cellular network or not according to the channel parallelism principle, thereby maximizing the system capacity.
Drawings
FIG. 1 shows the variation of system capacity with the transmission power of a base station under different access algorithms;
fig. 2 shows the D2D versus sum of rates for access to a cellular network under different access algorithms as a function of the base station transmit power.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
A D2D pair access algorithm (BCP) based on beam forming and channel parallelism threshold value, which carries out joint zero-forcing beam forming to cellular users according to the redundancy of base station transmitting antenna, and controls whether the D2D pair is accessed to cellular network according to the channel parallelism principle, thus making the system capacity maximum.
The radius of a cell is set to be 100 meters, a base station is located at the center of the cell, cellular master users are independently and uniformly distributed in a central area with the radius of 80 meters, D2D pairs are randomly distributed in a cell edge circular ring area with the radius of 80 meters to 100 meters, cellular users and D2D pairs of transceiving antennas are single antennas, the distance between a transmitter and a receiver of each pair of D2D is 5m, a path loss index is 2, all channels are Rayleigh fading channels, additive white Gaussian noise obeys Gaussian distribution with the average value of 0 and the variance of 1. As shown in table 1, the access method of this embodiment specifically includes the following steps:
the first step is as follows: initialization of parameters including the number of base station transmitting antennas NtThe number of cellular users K, the logarithm D of D2D, and the logarithm D of D2D participating in zero-forcing beamforming1Base station transmission power PBD2D transmitter transmit power PDD2D pairs of access state vectors that are not involved in zero-forcing beamforming
The channel parallelism threshold value δ.
The second step is that: initialization of channel state information including channel gain h from base station to cellular user kkChannel gain of base station to receiver of D2D pair
Channel gain from transmitter of D-th pair D2D pair to cellular user k
Channel gain g for the transmitter of the D-th pair D2D to the receiver of the i-th pair D2Dd,i；
The third step: joint zero-forcing beamforming for cellular users
Wherein the content of the first and second substances,
calculating a system capacity R;
the fourth step: D2D initializes the candidate set, computing parallelism between the channels from the base station to the remaining D2D pairs and the channels from the base station to the D2D pairs participating in zero-forcing beamforming
for i＝1:D1
for j＝1:(D-D1)
end
Selecting D2D pairs with channel parallelism greater than threshold value delta in D2D pairs not participating in joint zero-forcing beamforming to form a candidate set D2(i,:)；
end
The third step: D2D pair access judgment
Calculating a system capacity R';
and outputting the optimal system capacity R.
Based on the above process, the following algorithmic process is given:
TABLE 1. D2D pair access algorithm based on beamforming and channel parallelism threshold
Fig. 1 shows the variation of the system capacity with the transmission power of the base station, and Conv, ZF1 are given as a comparison. Figure 2 shows the D2D versus sum of rates for access to a cellular network as a function of base station transmit power.
In the present embodiment, the beneficial effects of the D2D based on the beamforming and the channel parallelism threshold on the access method are shown in: the invention carries out the joint zero forcing beam forming to the cellular users to eliminate the interference between the cellular users and the interference of the base station to the part D2D; and whether the D2D pair is accessed to the cellular network is controlled according to the channel parallelism principle, so that the interference of the base station to the D2D pair in the accessed cellular network is reduced.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. A D2D pair access method based on beam forming and channel parallelism threshold, characterized in that: accessing a certain amount of D2D to the cellular network, maximizing system capacity through joint zero-forcing beamforming and interference management; the method specifically comprises the following steps:
(1) initializing parameters: initializing the number of transmitting antennas of a base station, the number of cellular users, the logarithm of D2D, the logarithm of D2D participating in zero-forcing beam forming, the logarithm of D2D not participating in zero-forcing beam forming, an access state vector, the transmitting power of the base station, the transmitting power of a D2D transmitter and a channel parallelism domain value; a channel parallelism threshold, which is the parallelism threshold between a channel from the base station to the D2D pair not participating in zero-forcing beamforming and a channel from the base station to the D2D pair participating in zero-forcing beamforming;
(2) channel state information initialization: initializing channel gains of base station to cellular user, channel gains of base station to D2D receiver, channel gains of D2D transmitter to cellular user, channel gains of D2D transmitter to D2D receiver;
(3) calculating a zero-forcing beamforming vector of a cellular user and system capacity;
(4) D2D initializes the candidate set: for the D2D pairs which do not participate in the zero-forcing beamforming, calculating the parallelism between the channels from the base station to the D2D pairs and the channels from the base station to the D2D pairs which participate in the zero-forcing beamforming, and selecting all the D2D pairs with the parallelism larger than a threshold value to form a D2D pair candidate set;
(5) D2D pair access judgment: for the D2D pairs within the D2D pair candidate set, assume that a certain D2D pair is accessed to the cellular network: if the system capacity increases, the D2D pair is allowed to access the cellular network; otherwise, the D2D pair is not allowed to access the cellular network;
(6) repeating until completion: consider the next pair of D2D and repeat step (5) until all pairs of D2D are considered.
2. The method of claim 1, wherein the access method is based on beamforming and a domain of channel parallelism as D2D, and comprises: in the step (3), the zero-forcing beamforming vector of the cellular user is to perform joint zero-forcing beamforming on the cellular user by using channel state information from the base station to the cellular user and the part D2D pair according to the redundancy of the transmitting antenna of the base station.
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| CN104144507A (en) * | 2013-05-10 | 2014-11-12 | 上海贝尔股份有限公司 | Method, device and system for determining D2D pair communication resources |
| CN104349498A (en) * | 2013-07-23 | 2015-02-11 | 同济大学 | D2D pair user scheduling method based on MIMO precoding in cellular district |
| CN104854935A (en) * | 2012-12-10 | 2015-08-19 | 日电（中国）有限公司 | Methods and apparatuses of allocating resources for device-to-device communication |
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| KR20130020102A (en) * | 2011-08-19 | 2013-02-27 | 삼성전자주식회사 | A relay and a terminal in a multi-pair two-way relay network and a communicaton method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104854935A (en) * | 2012-12-10 | 2015-08-19 | 日电（中国）有限公司 | Methods and apparatuses of allocating resources for device-to-device communication |
| CN104144507A (en) * | 2013-05-10 | 2014-11-12 | 上海贝尔股份有限公司 | Method, device and system for determining D2D pair communication resources |
| CN103338457A (en) * | 2013-06-18 | 2013-10-02 | 东南大学 | Collaborative scheduling beam forming based user option method |
| CN104349498A (en) * | 2013-07-23 | 2015-02-11 | 同济大学 | D2D pair user scheduling method based on MIMO precoding in cellular district |
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