CN104640185B - A kind of cell dormancy power-economizing method based on base station collaboration - Google Patents
A kind of cell dormancy power-economizing method based on base station collaboration Download PDFInfo
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- CN104640185B CN104640185B CN201510087274.3A CN201510087274A CN104640185B CN 104640185 B CN104640185 B CN 104640185B CN 201510087274 A CN201510087274 A CN 201510087274A CN 104640185 B CN104640185 B CN 104640185B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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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
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of cell dormancy power-economizing method based on base station collaboration, this method include：Network energy-saving goal decomposition method based on Dynamic Programming, CoMP JT（Coordinated Multi point Joint Transmission cooperative multi-point joint transmissions）The low-complexity method of district dynamic cluster and the CoMP cell power under disturbed condition and OFDM subcarriers distribute optimization method under pattern.Through the invention, can be while realizing that cell dormancy is energy saving, the spectral efficient for making full use of base station collaboration technology to bring and lower co-channel interference realize further network energy-saving effect promoting.Further it is proposed that low complexity algorithm be also very suitable for carrying out sizable application in live network.
Description
Technical field
The present invention relates to a kind of cell dormancy power-economizing method based on base station collaboration, is related to LTE (Long Term
Evolution) network energy-saving problem belongs to the network technique field in cordless communication network.
Background technology
In network idle, suspend mode low-load cell has become a kind of widely accepted energy-saving square suitable for cellular network
Method.However, in the wireless cellular network disposed at present, after low-load cell dormancy, neighboring community usually requires to be promoted
Transmission power is to increase coverage area, and to service by the user in dormant cell, this is resulted under the energy-saving effect of network entirety
Drop.To cope with this deficiency, some researchs are pointed out, by cooperative multi-point technology (CoMP, Coordinated Multi-point)
Applied between the adjacent area of dormant cell, can cutting down the value added of adjacent area transmission power, thus it is horizontal to improve network energy-saving.
Cooperative multi-point technology is in 2010 by third generation affiliate (3GPP, 3rd Generation Partnership
Project) 10 standards of LTE Release are used, and are had been considered as at present in an important composition of LTE-Advanced
Hold, is considered the effective means of interference coordination and spectrum efficiency promotion.In the energy expenditure sides eNB that network energy-saving is paid close attention to the most
Face participates in eNB (evolved Node B) energy consumption model of cooperative multipoint transmission, will be including newly-increased signal processing energy consumption sum number
According to the passback energy consumption between base station.Based on such energy consumption model, some energy saving research based on CoMP are carried out.Study table
It is bright：It is compared to for non-cooperating system, using the system of CoMP in energy consumption and energy consumption grade (ECR, energy
Consumption ratings) aspect promoted.And in the performance of the energy efficiency of different CoMP collaboration modes, JT
(Joint Transmission) pattern has best energy efficiency.Except model selection, the cluster of CoMP
(Clustering) method is also a research hotspot.Because for different user parameter and load of base station situation, exist pair
The best CoMP clusters size answered, to realize the maximization of energy efficiency.
At present in terms of the energy-saving application of specific network, the prior art, which proposes, considers user QoS (Quality of
Service), the eNB transmission powers of the constraintss such as cooperative base station upper loading limit and frequency spectrum resource are combined excellent with frequency spectrum subcarrier
Change method.However, such methods are mostly based on static eNB cooperative clusters, the selection mode in cluster member's cell and cluster size side
There is limitation in face, be unfavorable for the large-scale use in real network energy-saving application.But then, once using dynamic CoMP at
Cluster method needs additionally to solve a preferred integer optimization problem of cluster member's cell configuration, and the solution of such problem is usual
It needs to use greedy search tool, the complexity for making former optimization problem is substantially increased therewith, and is next larger to existing net out tape
Challenge.Therefore it needs to design new low-complexity method.
Invention content
In view of the above-mentioned problems of the prior art, the present invention is by studying cooperative multipoint transmission (CoMP) in cell dormancy
A kind of application in energy saving, it is proposed that energy conservation optimizing method suitable for real network environment.This method is based on a minizone
Cooperation, includes the network energy-saving optimization problem of the constraintss such as inter-cell interference, QoS of customer and load of base station, and use
Dynamic programming method (Dynamic Programming) is by above-mentioned combination of network optimization problem according to the principle of dynamic programming method
It is divided into multiple independent cell dormancy stages (Stage).To each of which stage, the structure of its optimal cooperation cell cluster is first solved
At combination, reuses a heuristic and be iterated and matched with optimizing each transmission power for participating in cooperation cell and subcarrier
It sets, to reduce the overall complexity of method.Simulation result shows that this method has lower complexity and convenient for distribution
The advantages of deployment, is very suitable for real network energy-saving application.
Method proposed by the present invention includes three parts altogether：First, the network energy-saving goal decomposition side based on dynamic programming method
Method, second is that low complex degree cooperation cell cluster preferred method of combination under CoMP-JT (joint transmission) pattern, three being under disturbed condition
Cooperation cell power and OFDM subcarriers distribute optimization method.
The 1 network energy-saving goal decomposition method based on dynamic programming method
The dynamic programming method variable of standard includes several portions such as state, decision, state transition function and per stage expense
Point.Assuming that the state of stage i is S(k), then the state in its next stage be：
S(k+1)=I(k)(S(k),U(k)) (1)
Wherein I(k)、U(k)Respectively represent the state transition function applied in stage i and decision.
In the present invention, if network whole energy to be regarded as to a series of cell dormancy thing of existence time sequencings
Network state after kth time cell dormancy is denoted as by the set of part,
InIt represents comprising the cooperation cell cluster C around cell T to be closedTParticipation cell constitute, V(k)It represents at that time
The cell list of closing, LBS,b (k)Represent the business load of each cell, Ptx,i (k)Represent the transmission power of cell i.Enable U={ U(1),U(2),U(3),...U(k)Further to be taken on the basis of network state after the 1,2,3...k times cell dormancy
The configuration decisions of cell dormancy and user power and frequency resource.Then after+1 cell dormancy of kth, network state can be by S(k+1)Come
Description.Therefore former network optimization problem can be resolved into according to single subdistrict dormant event using cooperation cell cluster least energy consumption as target
A series of cell dormancy sub-stage of function
The energy optimization object function in each stage is:
Wherein PclusterRepresent L cell energy consumption P for participating in cooperation cell clusterBS,iThe sum of.Reach the energy optimization target
Restrictive condition is：
(S1) meet the rate requirement of each user；
(S2) it is less than the cell load upper limit and the base station transmitting power upper limit；
(S3) number of cells for participating in cooperation cell cluster is positive integer；
According to the thinking of dynamic programming method, the solution of final overall network energy saving optimizing problem can be obtained by the disaggregation of sub-stage
It arrives.In the method, the construction of sub-stage and solution are that chronologically priority iteration carries out, and are appointed when meeting in following two conditions
When meaning one, stop constructing new sub-stage：
(S4) solution of sub-stage is helpless to the reduction of network entirety energy consumption；
(S5) under given cooperation cell cluster size limitation, new association can not be constructed since cell load reaches the upper limit
Make cell cluster；
Low complex degree cooperation cell cluster preferred method of combination under 2 CoMP-JT (joint transmission) pattern
This method is based on CoMP-JT (joint transmission) operating mode.Assuming that after the energy saving suspend mode of target dormant cell T, use
Family provides service by cooperation cell cluster, and business load caused by the certain customers is evenly distributed to each of cooperation cell cluster
Participate in cell.Pass through selection when planning+1 cell dormancy of kth more than the respective upper limit to avoid participating in cooperation cell load
Currently (minimum cell is loaded in stage k) networks as target dormant cell T(k+1), load be：
WhereinIt represents target dormant cell and belongs to network M and still in working condition.Stage k is determined
It is the cooperation cell cluster that selection participates in CoMP-JT (joint transmission) from its adjacent area in next step after+1 target dormant cell
CombinationSolve the cooperation cell cluster combination for making network energy-saving effect be optimalIt need to consider
User QoS, the Multiple factors such as each cell base station business load.A Multidimensional Knapsack Problems are similarly to, at present in addition to searching method thoroughly
There are no very good solutions, but it is also relatively high to search method computational complexity thoroughly.
To reduce computation complexity, the present invention proposes the cooperation cell cluster preferred method of combination of three kinds of low complex degrees.Three kinds
Method is based respectively on network, three information dimensions of cell and user screen cluster cell, and it is small to consider dynamic clustering
Area's number and user's QoS demand.
A) CLS methods (Cluster Load Search Based Clustering Scheme)
CLS methods are a kind of load searching methods based on cooperation cell cluster.Carrying out+1 cell dormancy decision of kth
In, CLS is based on the network state parameters S after kth before time cell dormancy(k), after predicting Target cell suspend mode, own
User combines to alternative cooperation cell clusterThe sum of generated load increment valueIt carries out alternative
The load increment value sequence of cooperation cell cluster combination, and choose the cooperation cell cluster combination conduct of load increment value minimum
B) sum-SINR methods (User Sum SINR Based Clustering Scheme)
Sum-SINR methods pass through the user in target dormant cell of summing and the Signal to Interference plus Noise Ratio between the eNB of adjacent area
(SINR, Signal to Interference plus Noise Ratio) value θi (k+1), and then to adjacent area according to θi (k+1)It carries out
Sequence.Select θi (k+1)It is maximumA cell constitutes optimal cooperation cell cluster combination.
WhereinRepresent target dormant cell T(k+1)In user u receive the SINR of cell i signal.
C) sum-LOAD methods (Cell Sum Load Based Clustering Scheme)
Sum-LOAD methods are by the user in the target dormant cell of summing to loading σ caused by adjacent areai (k+1), in turn
To adjacent area according to σi (k+1)It is ranked up, selects σi (k+1)MinimumA cell constitutes optimal cooperation cell cluster combination.
Wherein,Represent target dormant cell T(k+1)In the loads that are brought to cell i of user u, NW, iIt represents small
The load capacity upper limit of area i.
3 power and OFDM subcarriers distribute optimization method
According to the cluster of above-mentioned cooperation cell cluster preferred method of combination as a result, present invention proposition one is changed based on cell power
The heuristic in generation.
Wherein, Δ is preset power iteration step value, can be needed according to operator and actual scene is set.
Compared with the existing technology, the present invention has the advantages that：The present invention utilizes Dynamic Programming thinking by network section
Energy PROBLEM DECOMPOSITION is a series of cell dormancy sub-stages, and the optimization clustering method for giving three kinds of low complex degrees is used for sub-stage
In cell cluster calculate.In view of the complexity of cell transmission power optimization under interference scene, the invention also provides one kind
Heuristic solves the transmission power optimal value of cooperation cell cluster member's cell by iteration optimization, with implementation complexity
The promotion further decreased with network whole energy effect.
Network energy-saving strategy based on the present invention has the following advantages that：
1. the present invention reduces the complexity that cooperation cell cluster calculates by proposing three kinds of improved methods.It can be applied to
Different Web vector graphic scenes, is compared to static clustering method, has greater flexibility；
2. CoMP-JT (joint transmission) proposed by the present invention participates in the transmission power iterative optimization method of cell, compared to
The energy conservation optimizing method that the area research document proposes before, computation complexity have and significantly reduce；
3, the network decomposition thinking proposed by the present invention based on Dynamic Programming, can further genralrlization decomposed to by catenet
It is multiple sub-networks so that parallel practice energy saving optimizing strategy, has preferable autgmentability；
Description of the drawings
Fig. 1 is a kind of schematic diagram of network.
Fig. 2 be the present invention relates to CoMP-JT (joint transmission) schematic diagram.
Specific implementation mode
Below in conjunction with the accompanying drawings, to a kind of embodiment party of the cell dormancy power-economizing method based on base station collaboration proposed by the present invention
Method is described further：
1) when carrying out+1 (k=0,1,2 ...) cell closing of kth, with reference to current generation state S(k)And wireless network passes
It broadcasts and (joins with business load model, the business load situation and network energy consumption situation for calculating each cell in the target network of selection
See attached drawing 1)；
2) each cell is ranked up according to business load, filters out the minimum target of business load and closes cell T(k+1)
(referring to attached drawing 2)；
3) according to the cooperation cell cluster size limitation being previously setThe three kinds of low complex degrees provided through the invention are dynamic
Any one of state clustering method constructs cooperation cell cluster CT(referring to attached drawing 2)；
4) optimization method is distributed according to power provided by the invention and OFDM subcarriers, to participating in CTCell power and son
Carrier wave is iterated optimization, and result is recorded as
5) according to S(k+1)With S(k)The calculating for carrying out network entirety energy consumption, if meeting iteration and continuing condition (S4), (S5)
Step 1) is repeated to 5)；If being unsatisfactory for iteration continues condition, iteration ends.
Claims (1)
1. a kind of cell dormancy power-economizing method based on base station collaboration, comprises the steps of：1) network energy-saving goal decomposition；2) it assists
Make the dynamic construction of cell cluster；3) power of cooperation cell cluster member and the distribution of OFDM subcarriers；To acquire maximum energy saving effect
Fruit, wherein latter two steps iteration carry out；
The step 1) is realized by a kind of network energy-saving goal decomposition method based on dynamic programming method：The section of network level
Energy goal decomposition is that there are the contextual independent cell dormancy stages in a series of sequential；Each stage focuses on surrounding target
Dormant cell dynamic establishes cooperation cell cluster CoMP clusters, and the energy-saving effect for pursuing cooperation cell cluster maximizes；
According to the cell traffic load situation and user rate demand for opening cooperation time point, maximum energy-saving effect has preferably been provided
Cooperation cell cluster；
The step 2) can be realized by any one in the cooperation cell cluster preferred method of combination of three kinds of low complex degrees；Specifically
For：Method one, search target dormant cell user choose business load to the business load of all alternative cooperation cell cluster combinations
Amount increases a minimum cooperation cell cluster combination and is combined as preferred cooperation cell cluster；Method two calculates target dormant cell
In user and each adjacent area Signal to Interference plus Noise Ratio SINR value and sum, arranged according to sequence, choose the highest L cell of value
It is combined as preferred cooperation cell cluster, wherein L is cooperation cell cluster assembled dimension；Method three calculates in target dormant cell
Load increment value and summation of the user with each adjacent area, arrange according to sequence, choose L minimum cell of value as preferred
Cooperation cell cluster combination；
The step 3) by under a kind of disturbed condition cooperation cell power and OFDM subcarriers distribution optimization method realize；The party
Method is based on user location, rate requirement, cooperation cell transmission power, channel condition, by designing a power iteration step value,
Since the transmission power of initial cell, optimum subdistrict transmission power is found by iteration；
Cooperation cell power under the disturbed condition and OFDM subcarriers distribution optimization method the specific steps are：At each
Iteration cycle calculates each user OFDM number of subcarriers demands after changing according to power iteration step value, and these is needed
Distribution is averaging in each cell that cooperation cell cluster combines；If these subcarrier demands are more than the son that cell can provide
The number of carrier wave upper limit, then stop iteration, otherwise continues power iteration.
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| CN104883725B (en) * | 2015-06-19 | 2018-10-09 | 东南大学 | Network energy-saving method based on website actual loading in a kind of long-term evolving network |
| CN106304232B (en) * | 2016-08-08 | 2019-09-24 | 北京邮电大学 | A kind of communication means and device of base station dormancy |
| EP3595348B1 (en) | 2017-03-31 | 2022-03-02 | Huawei Technologies Co., Ltd. | Method for determining cooperative cell, and network device |
| CN109286425A (en) * | 2018-05-23 | 2019-01-29 | 中国科学院上海微系统与信息技术研究所 | The multipoint cooperative dynamic clustering method and system of combined optimization energy efficiency and load balancing |
| CN110858983B (en) * | 2018-08-22 | 2023-04-25 | 中国移动通信集团山东有限公司 | Energy-saving control method and device for base station |
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