CN106535202A - Hybrid half duplex/full duplex transmission method of relay auxiliary non-authorization user - Google Patents

Hybrid half duplex/full duplex transmission method of relay auxiliary non-authorization user Download PDF

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Publication number
CN106535202A
CN106535202A CN201610993577.6A CN201610993577A CN106535202A CN 106535202 A CN106535202 A CN 106535202A CN 201610993577 A CN201610993577 A CN 201610993577A CN 106535202 A CN106535202 A CN 106535202A
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transmission
signal
time slot
receiver
relaying
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陈宏滨
程子胜
赵峰
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Guilin University of Electronic Technology
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Guilin University of Electronic Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a hybrid half duplex/full duplex transmission method of a relay auxiliary non-authorization user. The method comprises steps that a relay auxiliary non-authorization system comprises a pair of authorization user emitter and receiver, a pair of non-authorization user emitter and receiver and a potential cooperation relay formed by multiple non-authorization users; during half duplex transmission, one relay transmission frame is divided into two equal time slots; during full duplex transmission, each relay transmission frame is not divided into time slots; power of full duplex self interference is lower than a threshold, full duplex transmission is employed, otherwise, half duplex transmission is employed. The method is advantaged in that switching between half duplex transmission and full duplex transmission is carried out according to the self interference power, a full duplex throughput advantage is utilized to reduce unfavorable influence of self interference on throughput performance, and thereby transmission capacity of the non-authorization users is improved.

Description

A kind of half-duplex/full duplex combining transmission method of relaying auxiliary unauthorized user
Technical field
The present invention relates to cognitive radio technology field, and in particular to a kind of half-duplex of relaying auxiliary unauthorized user/ Full duplex combining transmission method.
Background technology
Nowadays, with the fast development of information-based industry, just in sharp increase, this just makes wireless mobile communications portfolio Obtaining available frequency spectrum resource becomes more and more rare, although new frequency band is continuously developed and utilizes, available for existing Frequency spectrum resource for, be still difficult to meet the demand of mass users two-forty, high reliable communication.Cognitive radio technology passes through Idle mandate frequency range is reused, the utilization rate of wireless frequency spectrum is improve, is in particular in, secondary user can be to authorizing User is not produced in the case of disturbing to ensure normal work strongly, and the mandate frequency range to not being fully utilized carries out further profit With, in order to avoid the waste of frequency spectrum resource, this concept already become solve radio spectrum resources it is deficient the problems such as important channel.
In cognitive junction network, relay cooperative can be effective against the impact that channel fading brings in systems.Thus It can be seen that, relaying technique can effectively improve network capacity in next generation wireless network.Equally, in cognitive radio networks In also there is outstanding using value.Find through research, in cognitive radio networks, by using relay cooperative technology It is transmitted, the transmission capacity of unauthorized user can be improved.Cognitive nothing can also be improved using relay cooperative technology simultaneously The diversity gain of line electric network so that the availability of frequency spectrum is further improved.
Relay system can send and receive information when communicating simultaneously, and this is not expected in the past, therefore double with first half Work transmission mode occupies dominant position.But with the development of interference cancellation techniques, people gradually recognize that full-duplex mode is Can realize.It refers to two frequency bands are not take up during trunking traffic to be also not take up two time slots just to realize sending and connecing Receiving is carried out simultaneously.Research shows that full duplex is compared semiduplex handling capacity and can be doubled in theory, but actually self Interference can not be completely eliminated, and handling capacity does not reach theoretical upper values.
It has been proposed that the half-duplex transmission method of a variety of cognition junction networks, it was demonstrated that they compare the link that direct transfers For, it is possible to increase the handling capacity of system, reduce its outage probability.With the development of self interference cancellation techniques, cognitive relaying The full duplex transmission of network is also gradually studied, and discloses self impact of the interference to handling capacity and outage probability.
But, there is problems with existing cognitive junction network technology：The concern information transfer of authorized master user and non- Interference problem of the authorized user to authorized user, and have ignored the unauthorized user for needing also exist for optimizing transmission.
The content of the invention
The technical problem of half-duplex, full duplex transmission method is only individually considered for existing cognitive junction network transmission, It is an object of the invention to provide a kind of half-duplex/full duplex combining transmission method of relaying auxiliary unauthorized user, according to self The power of interference switches between half-duplex transmission and full duplex transmission, so as to be weakened certainly using the handling capacity advantage of full duplex again I disturbs the adverse effect to throughput performance, so as to maximize the transmission capacity of relaying auxiliary unauthorized user.
In order to realize foregoing invention purpose, the technical solution used in the present invention is：
Half-duplex/full duplex the combining transmission method of relaying auxiliary unauthorized user, it is characterised in that：
The unauthorized system of relaying auxiliary includes a pair of authorized user transmitter PUTXWith receiver PURXTwo nodes, a pair Unauthorized user transmitter SUSWith receiver SUDTwo nodes, and the potential cooperating relay being made up of some unauthorized users SUKNode, and all nodes are all full duplexs, and potential unauthorized user is used as cooperating relay SUKNode be equipped with one Root transmitting antenna and a reception antenna, other be not potential unauthorized user as the user of cooperating relay node all only Equipped with a reception antenna；
During half-duplex transmission, a relay transmission frame is divided into two equal time slots, is respectively labeled as time slot 1 and time slot 2,
In time slot 1, unauthorized user transmitter SUSNode is with transmission power PS(W) send a signal xs(t), while awarding Power user PUTXNode is with transmission power PP(W) sending signal xpT (), system other nodes are monitored；
In time slot 2, potential relaying SUKTo receive from SUSSignal xs(t) and PUTXSignal xpT () combines, obtain Composite signal xcT then the composite signal amplification forwarding is given unauthorized user receiver SU by ()D, while authorized user's receiver PURXThe signal from relaying is received, and signal decoding x is received further according to time slot 1 and time slot 2pT (), the jamming power stood is PR(W), potential relaying SUKThe gain amplifier at place is designated as β, unauthorized user receiver SUDAccording to the signal solution that time slot 2 is received Code xsT (), the rate of information throughput are Rhalf,
During full duplex transmission, each relay transmission frame does not divide time slot,
Potential relaying SUKTo receive from SUSSignal xs(t) and from PUTXTransmission signal xpT () merges, and stand I.e. amplification forwarding is gone out, and produces self interference xk(t), unauthorized user receiver SUDWith authorized user receiver PURXAll receive To signal, authorized user receiver PURXAccording to the signal decoding x that time slot 1 and time slot 2 are receivedpT (), the jamming power stood isUnauthorized user receiver SUDAccording to the signal decoding x that time slot 2 is receivedsT (), the rate of information throughput are Rfull(bit/ S),
As self interference xkThe power P of (t)k(W) when less than given threshold Γ, potential relaying SUKFull-duplex mode is adopted just Transmission；Half-duplex transmission is otherwise adopted, rate of information throughput R of half-duplex/full duplex mixed transport is obtained accordingly,
In via node SUKTransmission power constraint and authorized user receiver PURXInterference constraints under maximize non-awarding Power receiver user SUDThe rate of information throughput at place, it is as follows to set up optimization problem,
Wherein I is authorized user receiver PURXPatient maximum interference power,By via node SUKMaximum send out Penetrate power decision,
To the optimization problem, the gain amplifier β of optimum is obtained,
If the optimization problem is convex, solved using lagrange's method of multipliers,
If the optimization problem is non-convex, convex optimization problem is first converted into, then with lagrange's method of multipliers or interior point Method is solved,
After obtaining the gain amplifier β of optimum, via node SUKDocking collect mail number process determine completely,
After optimum gain amplifier β is obtained after above-mentioned optimization, the transmitting work(of potential relaying is calculated further according to optimum β value Rate, then in primary user receiver PURXMaximum interference power can be stood and selected most under the conditions of remaining self jamming power two Excellent potential relaying is transmitted, so as to maximize the transmission capacity of relaying auxiliary unauthorized user.
Present invention achieves following Advantageous Effects：
1) present invention can be used to carry by relaying auxiliary during the shared frequency band of authorized user and unauthorized user in heterogeneous network High unauthorized user handling capacity situation；
2) model scheme of the invention has the wider scope of application, low complex degree；
3) the handling capacity advantage of full duplex can be utilized；
4) weaken self adverse effect of the interference to throughput performance.
The present invention is solved in cognitive relay network system, unauthorized user under the conditions of to primary user's interference constraints, By the half-duplex of potential relaying/full duplex mixed transport mode, by unauthorized user information transfer efficiency maximized problem, Have broad application prospects in cognitive radio technology field.
Description of the drawings
Fig. 1 is the unauthorized system schematic of relaying auxiliary；
Fig. 2 is information transmission time slots schematic diagram.
Specific embodiment
The present invention is described in further details below in conjunction with drawings and Examples.It should be appreciated that tool described herein Body embodiment only to explain the present invention, is not intended to limit the present invention.
As shown in figure 1, the unauthorized system of relaying auxiliary includes a pair of authorized user transmitter PUTXWith receiver PURX, one To unauthorized user transmitter SUSWith receiver SUDAnd (therefrom selected by the potential cooperating relay that some unauthorized users are constituted One is selected as relaying, the potential relaying of k-th is designated as SUK).All nodes are all full duplexs, potential unauthorized user SUKDress There are a transmitting antenna and a reception antenna, other user nodes are all only equipped with an antenna.Half-duplex is adopted in relay During transmission, as shown in Fig. 2 a relay transmission frame is divided into two equal time slots.In time slot 1, unauthorized user transmitter SUS With transmission power PS(W) send a signal xs(t), while authorized user PUTXWith transmission power PP(W) sending signal xp(t), System other nodes are monitored.Then now unauthorized user receiver SUD, relaying SUKAnd authorized user receiver PURXConnect The signal for receiving can be expressed as
Wherein PP、PSIt is authorized user transmitter PU respectivelyTXWith unauthorized user transmitter SUSTransmission power, xp (t)、xsT () is authorized user transmitter PU respectivelyTXWith unauthorized user transmitter SUSSending signal, their average It is 1 for 0, normalized square mean, wherein hij(i, j=s, k, d, p) represents the channel coefficients between user i to user j.n1(t)、n2 (t)、n3T it is that zero, variance is σ that () is average2Additive white Gaussian noise.If all channels are all quasi-static Rayleigh block declines Channel and channel coefficients transmit frame in and keep constant at one.
In time slot 2, potential relaying SUKTo receive from SUSSignal xs(t) and PUTXSignal xpT () combines, obtain Composite signal xcT then the composite signal amplification forwarding is given unauthorized user receiver SU by ()D, SUKThe signal of forwarding is represented For
Wherein β is relaying SUKGain amplifier, authorized user receiver PURXWith unauthorized user receiver SUDReception Signal is expressed as
Wherein hij(i, j=k, d, p) represents the channel coefficients between user i to user j.v1(t) and v3T () is that average is 0th, variance is σ2Additive white Gaussian noise.
Authorized user receiver PURXAccording to the signal decoding x that two time slots are receivedpT (), the jamming power stood is
PR(W)=β | hkp|2 (7)
Unauthorized user receiver SUDAccording to the signal decoding x that time slot 2 is receivedsT (), the rate of information throughput are expressed as:
By potential relaying SUKMaximum transmission power Pk,maxConstraint, gain amplifier β must are fulfilled for
If adopting full duplex transmission, each relay transmission frame does not divide time slot.Potential relaying SUKTo receive from SUS's Signal xs(t) and from PUTXTransmission signal xPT () merges, and amplification forwarding is gone out immediately, produces self interference xk(t)。 Potential relaying SUKSending signal be represented by：
Wherein PkIt is residual self jamming power after interference is eliminated, hkkIt is potential relaying SUKTransmitting terminal is to receiving terminal Channel coefficients, self interference modeling isAuthorized user receiver PURXWith Unauthorized user receiver SUDReception signal be expressed as
Authorized user receiver PURXAccording to the signal decoding x that two time slots are receivedpT (), the jamming power stood is
Unauthorized user receiver SUDAccording to the signal decoding x that time slot 2 is receivedsT (), the rate of information throughput are expressed as
As self interference xkThe power P of (t)kDuring less than threshold value Γ, using full duplex transmission；Half-duplex transmission is adopted otherwise. Therefore the rate of information throughput of half-duplex/full duplex mixed transport is
R=P (Pk<Γ)Rfull+P(Pk≥Γ)Rhalf (15)
Wherein P (Pk<Γ) it is PkLess than the probability of Γ.Optimization problem is established as
Wherein I is authorized user receiver PURXPatient maximum interference power.Parameter PK,max、PS、PP, I, Γ be to Fixed, parameter hij(i, j=s, k, d, p, k) and σ2Can be obtained by measuring.Parameter PkDepending on doing that full duplex is used Disturb removing method.Give certain interference elimination method, the P of a transmission framekValue be it is fixed, can be according to many transmission frames PkValue changes statistical probability P (Pk<Γ) with P (Pk>=Γ), so as to obtain the R shown in formula (16), substitute into formula (17) and optimization is asked Topic is solved.The constraint function of the optimization problem be all it is convex, but object function be not necessarily it is convex.If it is convex , solved using lagrange's method of multipliers；If it is non-convex, convex optimization problem is first converted it to, then with Lagrange Multiplier Method or interior point method are solved.After obtaining the gain amplifier β of optimum, the process of the potential relaying docking collection of letters number determines completely. As long as in each transmission frame P during practical applicationkLess than threshold valueΓWhen, just transmitted using full-duplex mode；Half-duplex mould is adopted otherwise Formula is transmitted, and is so achieved that half/full duplex mixed transport in whole message transmitting procedure.

Claims (1)

1. a kind of relaying aids in the half-duplex/full duplex combining transmission method of unauthorized user, it is characterised in that：
The unauthorized system of relaying auxiliary includes a pair of authorized user transmitter PUTXWith receiver PURXTwo nodes, a pair unauthorized User transmitter SUSWith receiver SUDTwo nodes, and potential cooperating relay SU being made up of some unauthorized usersKSection Point, and all nodes are all full duplexs, and potential unauthorized user is used as cooperating relay SUKNode equipped with one launch Antenna and a reception antenna, other are not that potential unauthorized user is all only equipped with one as the node of the user of cooperating relay Root reception antenna；
During half-duplex transmission, a relay transmission frame is divided into two equal time slots, is respectively labeled as time slot 1 and time slot 2,
In time slot 1, unauthorized user transmitter SUSNode is with transmission power PS(W) send a signal xs(t), while authorize using Family PUTXNode is with transmission power PP(W) sending signal xpT (), system other nodes are monitored；
In time slot 2, potential relaying SUKTo receive from SUSSignal xs(t) and PUTXSignal xpT () combines, combined Signal xcT then the composite signal amplification forwarding is given unauthorized user receiver SU by ()D, while authorized user receiver PURX The signal from relaying is received, and signal decoding x is received further according to time slot 1 and time slot 2pT (), the jamming power stood are PR (W), potential relaying SUKThe gain amplifier at place is designated as β, unauthorized user receiver SUDDecoded according to the signal that time slot 2 is received xsT (), the rate of information throughput are Rhalf,
During full duplex transmission, each relay transmission frame does not divide time slot,
Potential relaying SUKTo receive from SUSSignal xs(t) and from PUTXTransmission signal xpT () merges, and put immediately Forward greatly, produce self interference xk(t), unauthorized user receiver SUDWith authorized user receiver PURXLetter is received all Number, authorized user receiver PURXAccording to the signal decoding x that time slot 1 and time slot 2 are receivedpT (), the jamming power stood isUnauthorized user receiver SUDAccording to the signal decoding x that time slot 2 is receivedsT (), the rate of information throughput are Rfull(bit/ S),
As self interference xkThe power P of (t)k(W) when less than given threshold Γ, potential relaying SUKJust passed using full-duplex mode It is defeated；Half-duplex transmission is otherwise adopted, rate of information throughput R of half-duplex/full duplex mixed transport is obtained accordingly,
In via node SUKTransmission power constraint and authorized user receiver PURXInterference constraints under maximize unauthorized use Family receiver SUDThe rate of information throughput at place, it is as follows to set up optimization problem,
m a x &beta; R s . t . P R ( W ) &le; I , P ~ R ( W ) &le; I , &beta; &le; &beta; &OverBar;
Wherein I is authorized user receiver PURXPatient maximum interference power,By via node SUKMaximum transmission power Determine,
To the optimization problem, the gain amplifier β of optimum is obtained,
If the optimization problem is convex, solved using lagrange's method of multipliers,
If the optimization problem is non-convex, convex optimization problem is first converted into, then is asked with lagrange's method of multipliers or interior point method Solution,
After obtaining the gain amplifier β of optimum, via node SUKDocking collect mail number process determine completely,
After optimum gain amplifier β is obtained after above-mentioned optimization, the transmission power of potential relaying is calculated further according to optimum β value, then In primary user receiver PURXMaximum interference power can be stood and selected under the conditions of remaining self jamming power two optimum potential Relaying is transmitted, so as to maximize the transmission capacity of relaying auxiliary unauthorized user.
CN201610993577.6A 2016-11-10 2016-11-10 Hybrid half duplex/full duplex transmission method of relay auxiliary non-authorization user Pending CN106535202A (en)

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CN107171775A (en) * 2017-05-09 2017-09-15 桂林电子科技大学 The mixing duplex transmission method of safety of physical layer is lifted in a kind of cognitive junction network
CN107248908A (en) * 2017-05-04 2017-10-13 桂林电子科技大学 Duplex transmission method is mixed in a kind of cognitive junction network based on relay selection
CN107580328A (en) * 2017-08-16 2018-01-12 桂林电子科技大学 The spectrum auction method of social mutual trust is applied in a kind of femtocell isomery junction network
CN113746615A (en) * 2021-07-30 2021-12-03 天津师范大学 Method for switching communication node between full-duplex mode and half-duplex mode
CN114514709A (en) * 2019-10-15 2022-05-17 高通股份有限公司 Switching between full-duplex and half-duplex in millimeter wave nodes

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Cited By (8)

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CN107248908A (en) * 2017-05-04 2017-10-13 桂林电子科技大学 Duplex transmission method is mixed in a kind of cognitive junction network based on relay selection
CN107248908B (en) * 2017-05-04 2020-05-15 桂林电子科技大学 Hybrid duplex transmission method in cognitive relay network based on relay selection
CN107171775A (en) * 2017-05-09 2017-09-15 桂林电子科技大学 The mixing duplex transmission method of safety of physical layer is lifted in a kind of cognitive junction network
CN107171775B (en) * 2017-05-09 2020-09-11 桂林电子科技大学 Hybrid duplex transmission method for improving physical layer security in cognitive relay network
CN107580328A (en) * 2017-08-16 2018-01-12 桂林电子科技大学 The spectrum auction method of social mutual trust is applied in a kind of femtocell isomery junction network
CN114514709A (en) * 2019-10-15 2022-05-17 高通股份有限公司 Switching between full-duplex and half-duplex in millimeter wave nodes
CN113746615A (en) * 2021-07-30 2021-12-03 天津师范大学 Method for switching communication node between full-duplex mode and half-duplex mode
CN113746615B (en) * 2021-07-30 2023-09-01 天津师范大学 Method for switching communication node between full duplex mode and half duplex mode

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Application publication date: 20170322