CN105517002B - A kind of AF panel and energy-efficient Cellular Networks relay station dispositions method - Google Patents
A kind of AF panel and energy-efficient Cellular Networks relay station dispositions method Download PDFInfo
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- CN105517002B CN105517002B CN201510967434.3A CN201510967434A CN105517002B CN 105517002 B CN105517002 B CN 105517002B CN 201510967434 A CN201510967434 A CN 201510967434A CN 105517002 B CN105517002 B CN 105517002B
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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
- H04W16/18—Network planning tools
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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 kind of AF panels and energy-efficient Cellular Networks relay station dispositions method, for legacy cellular net, energy consumption is high, the problem that base station equipment is at high cost and energy efficiency is low, first according to the position distribution of user, the position coordinates and quantity of candidate relay are determined using K-means algorithm, and then establish the interference figure between candidate relay, building can be in deployment budget, the basic model of maximum energy efficiency under the restrictive condition of spectrum efficiency and interference threshold distance, the selection of relay station Optimization deployment is carried out using greedy selection mode accordingly, the final position for determining relay station and quantity, present invention can apply to honeycomb junction networks, new relay station can be directly disposed in the place of needs, reduce the total energy consumption of communication system, guarantee power system capacity and QoS of customer simultaneously.The present invention can be extended to the deployment of the other websites of Cellular Networks, such as micro-base station, Home eNodeB.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly, to a kind of AF panel and energy-efficient Cellular Networks relay station
Dispositions method.
Background technique
The fast development of wireless network is provided convenience for people's lives, but the huge energy consumption that the communications industry generates
It can not be ignored.The energy consumption of Information & Communication Technology becomes focal issue.Show that the energy consumption of ICT probably accounts for according to correlative study
According to the CO2 emissions in the whole world 2%.Especially base station energy consumption accounts for the 60%~80% of cellular network total energy consumption.Traditional bee
Nest network is no longer satisfied the demand of number of users and service traffics at present.Therefore, in order to reduce cellular network energy consumption, and
In conjunction with the direction that current cellular networks super-intensive is disposed, low-power consumption is introduced in a wireless communication system, the relay station of low cost is
It is necessary to.
Under the call of ICT industry energy-saving and emission-reduction, the concept of " green communications " is come into being, it is intended to reduce communication system
Total energy consumption, while guaranteeing power system capacity and the service quality of mobile subscriber.The raising of energy efficiency is realized in cellular networks
This emerging trend has pushed standardization authorities and the continuous Probe into Future power-saving technology of network operator, to improve internetworking
Energy.Some technologies have been suggested or have been applied, for example, by using advanced physical-layer techniques, such as MIMO, OFDM, cognition nothing
Line electricity, network code and collaboration communication etc.；Design the new network architecture, such as heterogeneous network, spaced antenna, multi-hop honeycomb；It answers
With radio and network resource management mechanism, such as different cross-layer optimization algorithms, dynamic power saving, multiple wireless are electrically accessed skill
Art coordination etc.；Based on estimated flow load, use cell zoom technology, dynamic base-station suspend mode to reach energy saving purpose.From
Since Van der Meulen proposes the theory of wireless relay channel, the deployment of relay station has obtained biggish concern and research.
Guo etc. analyzes the influence of the quantity and position of relay station to power system capacity, and demonstrate Optimization deployment can be improved it is indoor
The capacity at family 60% and outdoor user 38%.Chang and Lin proposes a kind of effective base station and relay station joint deployment side
Case makes the entirety of network throughput, deployment budget and system cover up to balance tradeoff.In addition, Chang etc. also proposed one kind
The new relay station deployment scheme based on cluster, while considering integrally covering for network throughput, deployment budget and system
Balance.Lu etc. proposes throughput-maximized relay station deployment issue, which is proved to be NP- difficulty, and proposes
One greedy heuritic approach, provides suboptimal solution for this problem.
However, the relay station deployment research of early period lays particular emphasis on the promotion of handling capacity and covering mostly, and have ignored energy consumption
The decline problem of energy efficiency caused by increasing, for the deployment situation of Cellular Networks relay station, few joint considers frequency spectrum effect
Influence of the interference between interference either relay station to energy efficiency between rate, lower deployment cost budget, base station and relay station.
For the legacy cellular net problem that energy consumption is high, base station equipment is at high cost and energy efficiency is low, the portion of relay station
Administration considers symmetrically to dispose mostly, however is difficult in practical application scene and symmetrically disposes, very due to frequency spectrum
Rare, in order to improve system spectral efficiency, the relay station and base station in the same cell are either past between relay station and relay station
Toward identical frequency band is used, this will cause intra-cell interference, and the methods of conventional power control is difficult to accomplish both to have improved frequency spectrum effect
Rate effectively inhibits the interference between relay station again, it is often more important that, under conditions of considering interference and lower deployment cost, frequency is not achieved
The dynamic equilibrium of spectrum efficiency and energy efficiency.
Summary of the invention
Deficiency in view of the above technology, the present invention provides a kind of AF panels and energy-efficient Cellular Networks relay station deployment side
Method, this method are able to achieve the random placement that relay station is carried out according to the position distribution of user, according to lower deployment cost budget, effectively press down
While having made the interference between relay station, reach the dynamic equilibrium of spectrum efficiency and energy efficiency, in lower deployment cost budget, relaying
Under conditions of co-channel interference and spectrum efficiency between standing, maximum energy efficiency determines the fixed relay station location of selection
And quantity, the energy consumption of Cellular Networks is reduced, base station equipment cost is reduced and improves energy efficiency.
Realize that the technical solution of the object of the invention is as follows:
A kind of AF panel and energy-efficient Cellular Networks relay station dispositions method, include the following steps:
1) abscissa and ordinate of all candidate relays are initialized, i.e.,Its
Middle n is the number of candidate relay；
2) user for determining and being connected with each initial candidate relay station is calculated；
3) the relative users coordinate that certain iteration belongs to k-th of slot is calculated；
4) it sums to all user coordinates in step 3) in k-th of slot, then averages；
5) according to the position coordinates and quantity of obtained candidate relay, in conjunction with predefined interference threshold distance value
dT, the interference figure between candidate relay is established, when the distance between two relay stations is less than dT, then it is assumed that it is deposited between the two relay stations
It is interfering, when the distance between two relay stations is greater than dT, then it is assumed that there is no interference between the two relay stations.
6) basic model of maximum energy efficiency is established；
7) position and the quantity of relay station are selected by the way of greedy deployment；
It is being maximized by above step in conjunction with the co-channel interference and lower deployment cost between spectrum efficiency, candidate relay
Under the model of energy efficiency, N can getrSpectrum efficiency and energy efficiency under a relay station deployment conditions, from this NrA relay station
In spectrum efficiency and energy efficiency under deployment conditions, selection meets ηSEThe deployment way of maximum energy efficiency while >=τ,
Finally can get deployment budget, spectrum efficiency and interference threshold distance restrictive condition under maximum energy efficiency with determination
Selected repeating station spacing and quantity are realized and inhibit interference and the deployment of energy-efficient Cellular Networks relay station.
In step 1), the abscissa and ordinate at initial relay station are respectively as follows:
In formula, Δ R is distance of the initial candidate relay station apart from base station, and n is the number of slot and of candidate relay
Number, can choose, k=1,2 ..., n represent k-th of slot, x according to the actual situationBAnd yBIt is the abscissa of base station respectively and vertical
Coordinate.
It is to obey intensity to be stored by the poisson process and home location register of λ according to user in step 2)
User information can obtain user location distribution figure in an observing time section, assign the user to n using K-means algorithm
In a slot, that is, the candidate relay in the user distance slot belonged in some slot is nearest.According to dividing slot number in cell
N, K-means function representation are as follows:
In formula, CkRepresent k-th of slot, XiIt is the coordinate of user i, RkIt is the position coordinates of k-th of initial candidate relay station,It indicates the coordinate for arbitrarily belonging to user i in k-th of slot, can thus obtain in slot user to k-th of initial candidate
The minimum range of relay station, that is, find the corresponding all users being connected with each initial candidate relay station.
In step 3), in order to create equally distributed slot, it is necessary to each candidate relay is calculated at a distance from all users,
User is added to corresponding slot according to the minimum range between candidate relay, when carrying out the t times iteration, if user i away from
Nearest from candidate relay k, then k-th of slot will be added in user i, belong to CkAll user coordinates calculation methods are as follows:
In formula,Represent k-th of slot when the t times iteration, XiIt is the coordinate of user i,When being the t times iteration
The position coordinates of k candidate relay,When being the t times iteration other than k-th of candidate relay remaining candidate relay
The position coordinates stood.
In step 4), a slot can only be added in each user, after assigning the user in corresponding slot, next to certain
The user coordinates that secondary iteration belongs in corresponding slot is summed, and is then averaged, as the coordinate of new candidate relay, no
It is disconnected to be iterated, the coordinate of the obtained candidate relay of iteration each time is found out, until the coordinate of candidate relay no longer becomes
Less than one accuracy value ε of difference of change or coordinate, then iteration terminates, and the position coordinates of final candidate relay can be obtained
In formula, t is the number of iteration,For the resulting candidate relay position coordinates of the t times iteration, XiIt is
The coordinate of user i, Σ XiThe user coordinates belonged in k-th of slot is summed in expression,It is that the t times iteration is fallen into k-th
Total number of users amount in slot,Indicate the coordinate of the user i arbitrarily belonged in k-th of slot,Represent when the t times iteration
K slot.The condition that iteration terminates are as follows:
In formula,It is the resulting candidate relay position coordinates of the t times iteration and the resulting time of the t-1 times iteration
The difference of repeating station spacing coordinate is selected, ε is accuracy value.
Due to the position of certain user be it is continually changing, the user distribution in multiple observing times is chosen, according to above
Method solved, the coordinate of the candidate relay in each observing time is obtained, finally in multiple observing time
Coordinate after station is averaged, and the position coordinates of metastable candidate relay are obtained.
In step 6), in a cell, all relay stations share a frequency band to improve the availability of frequency spectrum, neighboring community
Using different frequency bands, channeling is can be considered in non-conterminous cell, and the method in this way can extend to multiple cell
Relay station deployment, co-channel interference can be caused between each other when relay station simultaneous transmission, in order to avoid or reduce relay station it
Between interference, the distance between any two relay station has to be larger than a predefined interference threshold distance value dT, due to portion
Administration's cost is limited, and the cost of the relay station of institute subordinate must be within deployment budget space, while wanting mentioning for maximum possible
Cell throughout is risen, guarantees the spectrum efficiency of system.In addition, spectrum efficiency is defined as the ratio between handling capacity and bandwidth, energy efficiency
It is defined as the ratio between handling capacity and power consumption, bandwidth used in system is W.
The total throughout of system is
In formula,Indicate the handling capacity of k-th of candidate relay, RSkIt is a binary variable,Indicate the total throughout of selected all candidate relays, RBIt indicates
The total throughout for all users being connected with base station；
The total power consumption of system is
In formula,It indicates to be set as N in the quantity of the selected candidate relay of deployment budget limitationsr；ΔBAnd ΔR
Respectively represent the power amplification efficiency of base station and relay station, PBAnd PRRespectively represent the transmission power of base station and relay station, PB0And PR0Point
The quiescent dissipation of base station and relay station is not represented.
Based on condition described above, the basic model of maximum energy efficiency are as follows:
max ηEE
In formula,For system energy efficiency,For system spectral efficiency, τ is the expectation of system spectral efficiency
Value,Indicate the quantity in the selected candidate relay of deployment budget limitations, as Nr, DCRSIt is each relay station
Lower deployment cost, TDbIt is total deployment budget, k and k*Indicate any two relay station,Indicate the selected candidate of any two
Relay station k and candidate relay k*Between distance, dTIt is predefined interference threshold distance value.
In step 7), the coverage area of candidate relay is certain, it is assumed that the covering radius of each candidate relay
For Rr, in order to guarantee spectrum efficiency ηSE>=τ, the selection for candidate relay, is defined as follows criterion:
The more candidate relay of selection covering user, the i.e. biggish candidate relay of handling capacity are considered first；
Secondly consider the distance between candidate relay, i.e. influence of the interference between candidate relay to system performance is gone back
The mode for needing to introduce the deployment of relay station greediness of maximum energy efficiency can be taken, to select the position sum number of relay station
Amount, the mode of greediness deployment, includes the following steps:
A: the maximum relay station of handling capacity in candidate relay in selection cell is denoted as C1, calculate one relay station of deployment
When spectrum efficiency and energy efficiency, i.e. NrWhen=1,Then it updates
Remaining lower deployment cost TDb-DCRS·NrIf not zero, then execute second step；
B: removing and C1There are the candidate relay of interference, from selected in remaining candidate relay handling capacity it is biggish in
After station, it is denoted as C2, calculate the spectrum efficiency and energy efficiency when two relay stations of deployment, i.e. NrWhen=2, Continue to update remaining lower deployment cost TDb-DCRS·NrIf not zero, then in other candidates
On the basis of after the selection at station, candidate relay is selected in front and so on, distance has to be larger than d between relay station two-by-twoTWith
Guarantee that there is no interference between relay station, until remaining lower deployment cost TDb-DCRS·NrUntil≤0.
Beneficial effect
The present invention provides a kind of AF panel and energy-efficient Cellular Networks relay station dispositions method, this method is able to achieve basis
The position distribution of user carries out the random placement of relay station, does between lower deployment cost budget and effectively limit inhibition relay station meeting
While disturbing, determines selected candidate relay station location sum number amount, reach the dynamic equilibrium of spectrum efficiency and energy efficiency, this
Outside, which can be extended to the deployment of other Cellular Networks websites, such as micro-base station, Home eNodeB.
Detailed description of the invention
Fig. 1 is the operational flowchart of the method for the invention
Fig. 2 is the original state figure of Cellular Networks
Fig. 3 is the iteration stable diagram of Cellular Networks
Fig. 4 is the interference figure between the candidate relay of Cellular Networks
Fig. 5 is that the greediness of Cellular Networks relay station disposes the operational flowchart of selection
Specific embodiment
The content of present invention is further described with reference to the accompanying drawings and examples, but is not limitation of the invention.
Embodiment:
A kind of AF panel and energy-efficient Cellular Networks relay station dispositions method, include the following steps:
1) abscissa and ordinate of all candidate relays are initialized, i.e.,Its
Middle n is the number of candidate relay；
2) user for determining and being connected with each initial candidate relay station is calculated；
3) the relative users coordinate that certain iteration belongs to k-th of slot is calculated；
4) it sums to all user coordinates in step 3) in k-th of slot, then averages；
5) according to the position coordinates and quantity of obtained candidate relay, in conjunction with predefined interference threshold distance value
dT, the interference figure between candidate relay is established, when the distance between two relay stations is less than dT, then it is assumed that it is deposited between the two relay stations
It is interfering, when the distance between two relay stations is greater than dT, then it is assumed that there is no interference between the two relay stations.
6) basic model of maximum energy efficiency is established；
7) position and the quantity of relay station are selected by the way of greedy deployment；
It is being maximized by above step in conjunction with the co-channel interference and lower deployment cost between spectrum efficiency, candidate relay
Under the model of energy efficiency, N can getrSpectrum efficiency and energy efficiency under a relay station deployment conditions, from this NrA relay station
In spectrum efficiency and energy efficiency under deployment conditions, selection meets ηSEThe deployment way of maximum energy efficiency while >=τ,
Finally can get deployment budget, spectrum efficiency and interference threshold distance restrictive condition under maximum energy efficiency with determination
Selected repeating station spacing and quantity are realized and inhibit interference and the deployment of energy-efficient Cellular Networks relay station.
In step 1), the abscissa and ordinate at initial relay station are respectively as follows:
In formula, Δ R is distance of the initial candidate relay station apart from base station, and n is the number of slot and of candidate relay
Number, can choose, k=1,2 ..., n represent k-th of slot, x according to the actual situationBAnd yBIt is the abscissa of base station respectively and vertical
Coordinate.
It is to obey intensity to be stored by the poisson process and home location register of λ according to user in step 2)
User information can obtain user location distribution figure in an observing time section, assign the user to n using K-means algorithm
In a slot, that is, the candidate relay in the user distance slot belonged in some slot is nearest.According to dividing slot number in cell
N, K-means function representation are as follows:
In formula, CkRepresent k-th of slot, XiIt is the coordinate of user i, RkIt is the position coordinates of k-th of initial candidate relay station,It indicates the coordinate for arbitrarily belonging to user i in k-th of slot, can thus obtain in slot user to k-th of initial candidate
The minimum range of relay station, that is, find the corresponding all users being connected with each initial candidate relay station.
In step 3), in order to create equally distributed slot, it is necessary to each candidate relay is calculated at a distance from all users,
User is added to corresponding slot according to the minimum range between candidate relay, when carrying out the t times iteration, if user i away from
Nearest from candidate relay k, then k-th of slot will be added in user i, belong to CkAll user coordinates calculation methods are as follows:
In formula,Represent k-th of slot when the t times iteration, XiIt is the coordinate of user i,When being the t times iteration
The position coordinates of k candidate relay,When being the t times iteration other than k-th of candidate relay remaining candidate relay
The position coordinates stood.
In step 4), a slot can only be added in each user, after assigning the user in corresponding slot, next to certain
The user coordinates that secondary iteration belongs in corresponding slot is summed, and is then averaged, as the coordinate of new candidate relay, no
It is disconnected to be iterated, the coordinate of the obtained candidate relay of iteration each time is found out, until the coordinate of candidate relay no longer becomes
Less than one accuracy value ε of difference of change or coordinate, then iteration terminates, and the position coordinates of final candidate relay can be obtained
In formula, t is the number of iteration,For the resulting candidate relay position coordinates of the t times iteration, XiIt is
The coordinate of user i, Σ XiThe user coordinates belonged in k-th of slot is summed in expression,It is that the t times iteration is fallen into k-th
Total number of users amount in slot,Indicate the coordinate of the user i arbitrarily belonged in k-th of slot,Represent when the t times iteration
K slot.The condition that iteration terminates are as follows:
In formula,It is the resulting candidate relay position coordinates of the t times iteration and the resulting time of the t-1 times iteration
The difference of repeating station spacing coordinate is selected, ε is accuracy value.
Due to the position of certain user be it is continually changing, the user distribution in multiple observing times is chosen, according to above
Method solved, the coordinate of the candidate relay in each observing time is obtained, finally in multiple observing time
Coordinate after station is averaged, and the position coordinates of metastable candidate relay are obtained.
In step 6), in a cell, all relay stations share a frequency band to improve the availability of frequency spectrum, neighboring community
Using different frequency bands, channeling is can be considered in non-conterminous cell, and the method in this way can extend to multiple cell
Relay station deployment, co-channel interference can be caused between each other when relay station simultaneous transmission, in order to avoid or reduce relay station it
Between interference, the distance between any two relay station has to be larger than a predefined interference threshold distance value dT, due to portion
Administration's cost is limited, and the cost of the relay station of institute subordinate must be within deployment budget space, while wanting mentioning for maximum possible
Cell throughout is risen, guarantees the spectrum efficiency of system.In addition, spectrum efficiency is defined as the ratio between handling capacity and bandwidth, energy efficiency
It is defined as the ratio between handling capacity and power consumption, bandwidth used in system is W.
The total throughout of system is
In formula,Indicate the handling capacity of k-th of candidate relay, RSkIt is a binary variable,Indicate the total throughout of selected all candidate relays, RBIt indicates
The total throughout for all users being connected with base station；
The total power consumption of system is
In formula,It indicates to be set as N in the quantity of the selected candidate relay of deployment budget limitationsr；ΔBAnd ΔR
Respectively represent the power amplification efficiency of base station and relay station, PBAnd PRRespectively represent the transmission power of base station and relay station, PB0And PR0Point
The quiescent dissipation of base station and relay station is not represented.
Based on condition described above, the basic model of maximum energy efficiency are as follows:
max ηEE
In formula,For system energy efficiency,For system spectral efficiency, τ is the expectation of system spectral efficiency
Value,Indicate the quantity in the selected candidate relay of deployment budget limitations, as Nr, DCRSIt is each relay station
Lower deployment cost, TDbIt is total deployment budget, k and k*Indicate any two relay station,It indicates in the selected candidate of any two
After station k and candidate relay k*Between distance, dTIt is predefined interference threshold distance value.
In step 7), the coverage area of candidate relay is certain, it is assumed that the covering radius of each candidate relay
For Rr, in order to guarantee spectrum efficiency ηSE>=τ, the selection for candidate relay, is defined as follows criterion:
The more candidate relay of selection covering user, the i.e. biggish candidate relay of handling capacity are considered first；
Secondly consider the distance between candidate relay, i.e. influence of the interference between candidate relay to system performance is gone back
The mode for needing to introduce the deployment of relay station greediness of maximum energy efficiency can be taken, to select the position sum number of relay station
Amount, the mode of greediness deployment, includes the following steps:
A: the maximum relay station of handling capacity in candidate relay in selection cell is denoted as C1, calculate one relay station of deployment
When spectrum efficiency and energy efficiency, i.e. NrWhen=1,Then it updates
Remaining lower deployment cost TDb-DCRS·NrIf not zero, then execute second step；
B: removing and C1There are the candidate relay of interference, from selected in remaining candidate relay handling capacity it is biggish in
After station, it is denoted as C2, calculate the spectrum efficiency and energy efficiency when two relay stations of deployment, i.e. NrWhen=2, Continue to update remaining lower deployment cost TDb-DCRS·NrIf not zero, then in other candidates
On the basis of after the selection at station, candidate relay is selected in front and so on, distance has to be larger than d between relay station two-by-twoTWith
Guarantee that there is no interference between relay station, until remaining lower deployment cost TDb-DCRS·NrUntil≤0.
As shown in Figure 1:
(a) position coordinates and quantity for determining candidate relay are established candidate in conjunction with predefined interference threshold distance
Interference figure between relay station；
(b) building can maximize energy dose-effect under the restrictive condition of deployment budget, spectrum efficiency and interference threshold distance
The basic model of rate；
(c) selection of relay station Optimization deployment is carried out using greedy selection mode
As shown in Fig. 2, being the original state figure of base station cell net.
As shown in figure 3, relay station pointed by arrow represents the position of the candidate relay after successive ignition is stablized, meter
Calculating step includes step 2), step 3), step 4).
As shown in figure 4, the vertex of interference figure represents relay station, there is interference between representing relay station two-by-two in the side of interference figure,
If two vertex do not connect, then it is assumed that there is no interference between the two relay stations.By the position distribution of n candidate relay,
The distance between any relay station two-by-two can be calculated, when the distance between two relay stations is less than dT, then it is assumed that between the two relay stations
There are interference, when the distance between two relay stations is greater than dT, then it is assumed that there is no interference between the two relay stations, so as to establish
Interference figure between relay station.
As shown in figure 5, this method specifically includes:
Step S101 is calculated in each relay coverage according to candidate relay list obtained after iteration
User throughput；
Step S102 selects in cell the maximum relay station of handling capacity in candidate relay, is denoted as C1, calculate deployment one
Spectrum efficiency and energy efficiency when relay station, i.e. NrWhen=1,
Step S103 according to total deployment budget and has disposed relay station quantity, updates remaining lower deployment cost TDb-DCRS·
Nr；
Step S104, if remaining lower deployment cost TDb-DCRS·Nr> 0, thens follow the steps S105；If remaining lower deployment cost
TDb-DCRS·Nr≤ 0, then follow the steps step S106；
Step S105, removes and C1There are the candidate relays of interference, select handling capacity from remaining candidate relay
Biggish relay station, is denoted as C2, calculate the spectrum efficiency and energy efficiency when two relay stations of deployment, i.e. NrWhen=2, Step S103 and step S104 is executed, remaining deployment is updated
Cost TDb-DCRS·NrIf not zero, then the selection of other candidate relays in front candidate relay selection on the basis of with
This analogizes, until step S106 residue lower deployment cost TDb-DCRS·NrUntil≤0；
Step S106, when meeting TDb-DCRS·NrWhen≤0, then relay station deployment selection terminates.
It is being maximized by above step in conjunction with the co-channel interference and lower deployment cost between spectrum efficiency, candidate relay
Under the model of energy efficiency, N can getrSpectrum efficiency and energy efficiency under a relay station deployment conditions, from this NrA relay station
In spectrum efficiency and energy efficiency under deployment conditions, selection meets ηSEThe deployment way of maximum energy efficiency while >=τ,
Finally can get deployment budget, spectrum efficiency and interference threshold distance restrictive condition under maximum energy efficiency with determination
Selected repeating station spacing and quantity are realized and inhibit interference and the deployment of energy-efficient Cellular Networks relay station.
Claims (4)
1. a kind of AF panel and energy-efficient Cellular Networks relay station dispositions method, include the following steps:
1) abscissa and ordinate of all candidate relays are initialized, i.e.,Wherein n is
The number of candidate relay；
2) user for determining and being connected with each initial candidate relay station is calculated；
3) the relative users coordinate that certain iteration belongs to k-th of slot is calculated；
4) it sums to all user coordinates in step 3) in k-th of slot, then averages；
5) interference figure between candidate relay is established, according to the position coordinates and quantity of candidate relay obtained after iteration,
In conjunction with predefined interference threshold distance value dT, obtain the interference figure between candidate relay；
6) basic model of maximum energy efficiency is established；
7) position and the quantity of relay station are selected by the way of greedy deployment；
It is characterized in that, each user can only be added a slot and connect after assigning the user in corresponding slot in step 4)
The user coordinates belonged in corresponding slot to certain iteration that gets off is summed, and is then averaged, as new candidate relay
Coordinate, be constantly iterated, find out the coordinate of the obtained candidate relay of iteration each time, until the seat of candidate relay
Mark no longer less than one accuracy value ε of difference of variation or coordinate, then iteration terminates, and the position of final candidate relay can be obtained
Set coordinate
In formula, t is the number of iteration,For the resulting candidate relay position coordinates of the t times iteration, XiIt is user i
Coordinate, ∑ XiThe user coordinates belonged in k-th of slot is summed in expression,It is that the t times iteration is fallen into k-th of slot
Total number of users amount,Indicate the coordinate of the user i arbitrarily belonged in k-th of slot,Represent k-th when the t times iteration
Slot, the condition that iteration terminates are as follows:
In formula,It is in the resulting candidate relay position coordinates of the t times iteration and the resulting candidate of the t-1 times iteration
After the difference of station location coordinate, ε is accuracy value；
Due to the position of certain user be it is continually changing, the user distribution in multiple observing times can be chosen, obtain every time
The coordinate of candidate relay in observing time finally averages to the coordinate of the relay station in multiple observing time
Obtain the position coordinates of metastable candidate relay.
2. AF panel according to claim 1 and energy-efficient Cellular Networks relay station dispositions method, which is characterized in that step
6) in, in a cell, all relay stations share a frequency band to improve the availability of frequency spectrum, and neighboring community uses different frequencies
Band, non-conterminous cell consider that channeling, the relay station that the method can extend to multiple cell in this way are disposed, work as relaying
Can cause co-channel interference when simultaneous transmission of standing between each other, in order to avoid or reduce relay station between interference, any two
The distance between relay station has to be larger than a predefined interference threshold distance value dT, since lower deployment cost is limited, institute
The cost of the relay station of subordinate must be within deployment budget space, while wanting the promotion cell throughout of maximum possible, guarantees
The spectrum efficiency of system, in addition, spectrum efficiency is defined as the ratio between handling capacity and bandwidth, energy efficiency is defined as handling capacity and power
The ratio between consumption, bandwidth used in system are W,
The total throughout of system is
In formula,Indicate the handling capacity of k-th of candidate relay, RSkIt is a binary variable, Indicate the total throughout of selected all candidate relays, RBIndicate with
The total throughout of the connected all users in base station；
The total power consumption of system is
In formula,It indicates to be set as N in the quantity of the selected candidate relay of deployment budget limitationsr；ΔBAnd ΔRRespectively
Represent the power amplification efficiency of base station and relay station, PBAnd PRRespectively represent the transmission power of base station and relay station, PB0And PR0Generation respectively
The quiescent dissipation of table base station and relay station,
Based on condition described above, the basic model of maximum energy efficiency are as follows:
max ηEE
Wherein,For system energy efficiency,For system spectral efficiency, τ is the desired value of system spectral efficiency,Indicate the quantity in the selected candidate relay of deployment budget limitations, as Nr, DCRSIt is the portion of each relay station
Affix one's name to cost, TDbIt is total deployment budget, k and k*Indicate any two relay station,Indicate the selected candidate relay of any two
Stand k and candidate relay k*Between distance, dTIt is predefined interference threshold distance value.
3. AF panel according to claim 1 and energy-efficient Cellular Networks relay station dispositions method, which is characterized in that step
7) in, the coverage area of candidate relay is certain, it is assumed that the covering radius of each candidate relay is Rr, in order to guarantee
Spectrum efficiency ηSE>=τ, the selection for candidate relay, is defined as follows criterion:
The more candidate relay of selection covering user, the i.e. biggish candidate relay of handling capacity are considered first；
Secondly consider the distance between candidate relay, i.e. influence of the interference between candidate relay to system performance can adopt
The mode for needing to introduce the deployment of relay station greediness of maximum energy efficiency is taken, to select position and the quantity of relay station.
4. AF panel according to claim 1 and energy-efficient Cellular Networks relay station dispositions method, which is characterized in that described
Greedy deployment mode, include the following steps:
A: the maximum relay station of handling capacity in candidate relay in selection cell is denoted as C1If bandwidth used in system is W, candidate
The quantity of relay station is denoted as Nr, ΔBAnd ΔRRespectively represent the power amplification efficiency of base station and relay station, PBAnd PRRespectively represent base station and
The transmission power of relay station, PB0And PR0Respectively represent the quiescent dissipation of base station and relay station, ηSEFor system spectral efficiency, ηEEFor
System energy efficiency, RBIndicate the total throughout for all users being connected with base station；RC1Indicate C1The handling capacity of candidate relay,
Calculate the spectrum efficiency and energy efficiency when one relay station of deployment, i.e. NrWhen=1, Then remaining lower deployment cost TD is updatedb-DCRS·NrIf not zero, then execute second step；
B: removing and C1There are the candidate relays of interference, and the biggish relay station of handling capacity is selected from remaining candidate relay,
It is denoted as C2, RC2Indicate C2The handling capacity of candidate relay calculates spectrum efficiency and energy efficiency when two relay stations of deployment, i.e.,
NrWhen=2,Continue to update remaining lower deployment cost TDb-DCRS·
NrIf not zero, then the selection of other candidate relays in front candidate relay selection on the basis of and so on, two-by-two in
D is had to be larger than after distance between stationTTo guarantee that there is no interference between relay station, until remaining lower deployment cost TDb-DCRS·Nr≤0
Until.
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