CN106714241A - Small cell opening method based on business loads and calculation of shortest average distance - Google Patents

Small cell opening method based on business loads and calculation of shortest average distance Download PDF

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Publication number
CN106714241A
CN106714241A CN201710000589.9A CN201710000589A CN106714241A CN 106714241 A CN106714241 A CN 106714241A CN 201710000589 A CN201710000589 A CN 201710000589A CN 106714241 A CN106714241 A CN 106714241A
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cell
macrocell
load
average distance
threshold
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CN106714241B (en
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申滨
黄磊
雷珍珠
郑建宏
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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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
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention belongs to the technical field of mobile communication, and relates to a small cell opening method based on business loads and calculation of the shortest average distance. The method is characterized in that whether a small cell opening action is to be carried out or not is firstly judged through business load information; in the case of a large number of candidate closed small cells, a group of small cells with the largest business load, which may include macro cells, are then found out through the technical characteristics of CoMP; and the small cell, which is away from the group of the small cells by the shortest average distance, is finally selected from the candidate closed small cells as a target to be opened. The method provided by the invention has the advantages that the implementation is simple, the amount of exchanged information is small, and the closed small cells can remain closed as long as possible; and meanwhile, the multiple closed small cells can be screened optimally to meet the requirements of network business volume changes, and the most appropriate small cell can be quickly opened.

Description

The cell open method that a kind of based on business load and most short average distance is calculated
Technical field
The invention belongs to mobile communication technology field, be related to it is a kind of based on business load and most short average distance calculate it is small Cell open method.
Background technology
In order to meet future mobile communications power system capacity higher and user rate demand, industry proposes heterogeneous network The system architecture of (Heterogeneous Networks, HetNets), covering in relatively large scope is provided using macrocell Lid, the less cell of coverage then mainly provides capacity compensation.But with the portfolio produced by indoor and hot zones The proportion for accounting for total traffic increases year by year, and heterogeneous network need to be further enhanced.For this 3GPP proposed in Release-12 it is small The solution of cell enhancing (Small Cell Enhancement, SCE), wherein slight area's indoor scene and focus scene, It is closely related at aspects such as design scenario, technical scheme and performance objectives with current industry hot research technology LTE-Hi, the two Direct emphasis is for hot spot region and room area service coverage scene and business enhancing target.
LTE-Hi systems are by indoors or hot zones dispose cell and realize dividing macrocell business load Stream.In the case where load is relatively low, it is understood that there may be the cell of numerous low traffics or zero portfolio, if remaining small Cell is in opening, then will have big energy to be wasted.In order to save system energy consumption, energy efficiency is improved, it is negative in business It is the research in current LTE-Hi systems that some cells are placed in into closing (or dormancy) state in the case that carrying capacity is relatively small Emphasis.It is pointed out that both open and close of cell interwoveness, but the current focus of work be concentrated mainly on as What closes cell, and the research of only only a few considers the method for opening cell simultaneously.
The flow for opening cell can substantially be attributed to：(1) certain trigger condition/event is produced；(2) system or (control Center) make unlatching judgement；(3) from off state to the conversion of opening；(4) in opening.Research is then main to collect In on (1) and (3), for the design of trigger event, current candidate scheme is mainly had business load amount size, is arrived based on UE Up to situation of leaving and arrival based on packet call with complete etc.；The research of state conversion process is then concentrated mainly on as What is reduced in conversion time.
A kind of cell running scheme that current industry is present be by obtain macrocell and its control under each open The business load amount of state cell is opened, these portfolios are contrasted with set threshold value, when more than threshold value, then can opened The cell of state is closed around it.The defect of this kind of scheme mainly has at 3 points：First, when small cell traffic load is raised, its Around there may be and have turned on but cell that business load is relatively small, if directly select opening the neighbouring small cell of closing state Apparently not optimal selection；If second, when there is multiple closed mode cells around the cell of load rise, it should how Which is selected open wherein；Third, when macrocell load rise, it should which where is selection from numerous closed mode cells One unlatching.In order to process above Railway Project, associated solutions are occurred in that respectively, for example, being risen in load to filter out Which cell of unlatching when high, has scheme to propose user terminal UE (user equipment) and between base station by intercoursing Positional information and do not support positioning system in realized using certain triangulation algorithm positioning, when system learns each It is to understand which the increased areas adjacent of load has and close state cell, but this scheme with reference to network topological information behind position Complexity is compared with high and energy consumption is big.In addition, some schemes are proposed in load rise, the last cell closed is opened in selection, Though the program realizes simply, there is accuracy problem, such as when newly-increased load is from the slight of another resting state When in area's coverage rather than the cell of last closing, the performance for now opening the last cell closed is not then most Excellent.
The content of the invention
In view of this, it is an object of the invention to provide a kind of based on business load and most short average distance calculate it is slight Area's open method, is related to the unlatching in the cell of LTE-Hi (LTE-Hot spot/indoor) system under heterogeneous network switch Control technology.The method chooses the set of the relatively large cell of business load amount and macrocell in network coverage, Each cell and the average distance of each element in the set being closed by contrast, are decided whether in the presence of most suitable Run the cell that opens jointly and trigger command controls it to open.Only in part, (i.e. each is mutual for the load information exchanged in this method Between neighbouring macrocell and cell) and be not used in whole network aspect collecting the load of all of cell and macro base station Information, has saved system energy consumption.In addition, for maximum energy efficiency, it is to avoid open unnecessary cell, set in the present invention Meter opens the process of cell in same macrocell coverage area and same unlatching can only be small at some in controlling cycle Carried out in cell.
To reach above-mentioned purpose, the present invention provides following technical scheme：
The cell open method that a kind of based on business load and most short average distance is calculated, in the method, profit first Judge whether to carry out cell breakdown action with traffic load information, then for the small number of cells of closed mode of candidate More situation, using CoMP (Coordinated Multiple Points cooperate with multicast communication) technical characteristic, finds out industry The maximum one group of cell (may wherein include macrocell) of business load, finally in the cell being closed of candidate There is the cell of most short average distance as unlatching object between selection and the group cell.
Further, it is described to judge that whether to carry out cell breakdown action is specially using traffic load information： The set of business load amount relatively large cell and macrocell is chosen in network coverage, by contrast in closing shape Each cell of state and the average distance of each element in the set, decide whether in the presence of the cell for being best suitable for opening and touch Say the word and control its unlatching；The load information of exchange is only local (i.e. between each mutually adjacent macrocell and cell) It is not used in whole network aspect collecting the load information of all of cell and macro base station, has saved system energy consumption.In addition, being Maximum energy efficiency, it is to avoid open unnecessary cell, designs the process for opening cell same grand in the present invention Can only be carried out in some cell in cell coverage area and in same unlatching controlling cycle.
Further, in the method, macrocell periodically obtain its lower each cell of control load information and The load information of itself；Subsequently determine whether load more than threshold value λthresholdAnd the duration is more than TthresholdSmall number of cells Account for whether total ratio for opening state cell exceedes thresholding P, and whether macrocell load is more than thresholding λMC-thresholdAnd continue Time is more than TMC-threshold；If above-mentioned two condition at least one meets, the action for carrying out opening cell is needed；Need It is noted that the effect of setting thresholding P is：Although the load of certain cell exceedes thresholding λthresholdIf, but around it There is the cell of low business load, it is meant that can be by a part of service distributing of the high capacity cell to low business around it The cell of amount, without going to open certain cell being closed, but when more than threshold value λthresholdIt is slight When the ratio in area is more than P, it is meant that high capacity cell is in the majority, there is no it is suitable, only exist low business load, be in The cell of opening is shunted to the increased business of institute in network.Now, system (or control centre) should make Judgement is opened, this target is realized to trigger cell that some is closed.
Further, in the method, when needing to carry out cell breakdown action, macrocell switchs record by detecting it Or small cell status record learns which cell is in and closes state；If close state cell only one of which, macrocell directly to It sends open signal；If more than one, maximum one of portfolio is judged using multicast communication CoMP technical characteristics are cooperateed with Group cell, then obtains each closed mode cell to the distance of each cell in this group of cell by network topology, and herein On the basis of calculate average distance, finally selection with most short average distance closing state cell and be turned on.
Further, the method specifically includes following steps：
Step one：In LTE system, information exchange is realized by X2 interface between each cell；First, macro cell base station is true Determine own load information, and the load information that each cell under its control is reported periodically is received by X2 interface； Assuming that the small cell cluster of unlatching state in certain macrocell network coverage is Son={ SC1, SC2..., SCM, collection is obtained Traffic load information be λTotal={ λ1, λ2..., λM, macrocell own load information is λMC；Then, macro cell base station is sentenced Disconnected load is more than threshold value λthresholdAnd the duration is more than TthresholdSmall number of cells account for total ratio for opening state cell Whether example exceedes thresholding P, and whether macrocell load is more than thresholding λMC-threshold, the duration is more than TMC-threshold；If Above-mentioned two condition at least one meets, then need the action for carrying out opening cell, i.e.,：
Or
λMC＞ λMC-threshold&&T>TMC-threshold
Wherein,The cell number of threshold value is respectively greater than for load and duration Amount, M is total to open state cell；
Step 2：After macrocell has carried out the judging process of step one, cell breakdown action is if desired carried out, it is grand small Know which cell is currently under closed mode in Qu Congqi records, if the cell for being currently in closed mode only has one Individual, then macrocell directly sends open signal to the cell, subsequently enters step 5；If the cell of candidate is more than one, Then macrocell performs step 3；
Step 3：Macrocell determines that those use CoMP to obtain the UE of service, and can wherein choose all or part of UE, Obtain set UECoMP={ UE1, UE2..., UEX}；Then, detect successively to UEi(i=1,2 ..., X) a group for servicing is provided Cell (wherein may also include macrocell, as follows), for example, can be by detecting CoMP signalings in the UE and which cell Between be transmitted and obtain.It is in actual applications, general simultaneously for the cell number that some UE provides service is two to three, So after having detected each self-corresponding CoMP services cells of all of UE, it may be determined that go out two to three for most UE is provided The cell of service, it is assumed that be CH={ C1, C2, C3}.The group cell for most UE due to providing service, and business load is most heavy, So be badly in need of unlatching cell carries out service distributing to it, step 4 is subsequently entered；
Step 4：Due to known network topological condition, it is slight that macrocell can show that each closes state in its record sheet Area SCoff={ SC1, SC2..., SCjArrive set CHIn each cell distance, and calculate each closed mode cell The average distance of each cell, such as SC in the slight district's groupsoff={ SC1, SC2, SC3, CH={ C1, C2, C3, obtain
Wherein,It is SCiTo CHAverage distance,It is SCiTo CjDistance.Contrast eachSystem (or control centre) will give the cell being closed with most short average distance, i.e., to optimal to be opened slight Area
Send and open trigger signal.
Step 5：The cell being closed is by monitoring interface to the open signal sent from macrocell Afterwards, into operating process is opened, after the cell is smoothly opened, sent to macrocell and open pass signal, macrocell will more New SCoffWith SCon；Afterwards, the new cell opened will receive the industry sent from high capacity cell (or macrocell) around it Business handover information, part UE is switched on its service link, and by offer service it；Finally, into next switch Controlling cycle.It is to be herein pointed out the possible more than one of the most short cell of average distance is obtained in step 4, now A unlatching can be randomly selected.
The beneficial effects of the present invention are：The method that the present invention is provided realizes that information content that is simple, exchanging is few, and may be such that The cell of closed mode is remained off with the time as long as possible；At the same time it can also the change of response to network portfolio Need, most optimally screen the multiple cells being closed, and wherein most suitable cell is quickly opened.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out Explanation：
Fig. 1 is cell switch control scene graph；
Fig. 2 is the operational flowchart at macrocell end when opening cell；
Fig. 3 is the operational flowchart at cell end when opening cell；
Fig. 4 is using the optimal cell flow chart to be opened of minimum average B configuration distance screening.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 be cell switch control scene graph, the present invention provide method include four preconditions set forth below and Five key steps：
Precondition 1：The position of each cell (including macrocell and cell) is, it is known that and each cell knows its week The cell of presence is enclosed, realizes that this condition can be configured or according to certain method of automatic configuration by operator in on-premise network (i.e. the method realizes confirming the function of its peripheral cell when certain cell is subsequently individually deployed in network).
Precondition 2：Macrocell end can record the state and corresponding history of each cell under its control Switch record.Due to the invention mainly relates to cell open method, therefore assume in certain cell before closed mode is entered Can be sent into the signal of closed mode to its macrocell, macrocell will record its state and shutoff operation after receiving.In reality When applying the operation for opening cell, system (or control centre) is then using one or more cells in the record as candidate. Equally, after cell is opened, its state and unlatching operation can also be recorded by macrocell.
Precondition 3：Cell under closed mode is not fully and completely closed, and it is specifically used to receive grand in the presence of one The communication interface of unlatching (or wake-up) signal that cell sends, and the moment is in listening state.
Precondition 4：In lte-a system, UE can be connected with multiple cells simultaneously by using CoMP technologies.LTE-Hi It is a kind of strengthening system towards LTE system, it is therefore assumed that can also use CoMP technologies in LTE-Hi systems.In fact, It is necessary using CoMP technologies in LTE-Hi, when offered load rises, UE is made simultaneously by using CoMP technologies Receive the service of multiple cells, especially the UE of cell edge, not only ensure that the QoS of user, and in some sense For realize load balancing.Meanwhile, in the methods of the invention, due to using CoMP technologies as the base of implementer's case Plinth, also causes that the cell of closed mode is remained off with the time as long as possible, improves system energy efficiency.
On the basis of above-mentioned precondition, the concrete operation step of the present invention program is：
Step one：In LTE system, information exchange is realized by X2 interface between each cell.First, macro cell base station is true Determine own load information, and the load information that each cell under its control is reported periodically is received by X2 interface. Assuming that the small cell cluster of unlatching state in certain macrocell network coverage is Son={ SC1, SC2..., SCM, collection is obtained Traffic load information be λTotal={ λ1, λ2..., λM, macrocell own load information is λMC.Then, macro cell base station is sentenced Disconnected load is more than threshold value λthresholdAnd the duration is more than TthresholdSmall number of cells account for total ratio for opening state cell Whether example exceedes thresholding P, and whether macrocell load is more than thresholding λMC-threshold, the duration is more than TMC-threshold.If Above-mentioned two condition at least one meets, then need the action for carrying out opening cell.I.e.：
Or
λMC＞ λMC-threshold&&T>TMC-threshold
Wherein,The cell number of threshold value is respectively greater than for load and duration Amount, M is total to open state cell.
Step 2：After macrocell has carried out the judging process of step one, cell breakdown action is if desired carried out.It is grand small Know which cell is currently under closed mode in Qu Congqi records, if the cell for being currently in closed mode only has one Individual, then macrocell directly sends open signal to the cell, subsequently enters step 5.If the cell of candidate is more than one, Then macrocell performs step 3.
Step 3：Macrocell determines that those use CoMP to obtain the UE of service, and can wherein choose all or part of UE, Obtain set UECoMP={ UE1, UE2..., UEX}.Then, detect successively to UEi(i=1,2 ..., X) a group for servicing is provided Cell (wherein may also include macrocell, as follows), for example, can be by detecting CoMP signalings in the UE and which cell Between be transmitted and obtain.It is in actual applications, general simultaneously for the cell number that some UE provides service is two to three, So after having detected each self-corresponding CoMP services cells of all of UE, it may be determined that go out two to three for most UE is provided The cell of service, it is assumed that be CH={ C1, C2, C3}.The group cell for most UE due to providing service, and business load is most heavy, So be badly in need of unlatching cell carries out service distributing to it, step 4 is subsequently entered.
Step 4：Due to known network topological condition, macrocell can show that each closes state cell in its record sheet SCoff={ SC1, SC2..., SCjArrive set CHIn each cell distance, and calculate each closed mode cell and arrive The average distance of each cell, such as SC in the slight district's groupsoff={ SC1, SC2, SC3, CH={ C1, C2, C3, obtain
Wherein,It is SCiTo CHAverage distance,It is SCiTo CjDistance.Contrast eachSystem (or control centre) will give the cell being closed with most short average distance, i.e., to optimal to be opened slight Area
Send and open trigger signal.Fig. 2 is the operational flowchart at macrocell end when opening cell.
Step 5：The cell being closed is by monitoring interface to the open signal sent from macrocell Afterwards, into operating process is opened, after the cell is smoothly opened, sent to macrocell and open pass signal, macrocell will more New SCoffWith SCon.Afterwards, the new cell opened will receive the industry sent from high capacity cell (or macrocell) around it Business handover information, part UE is switched on its service link, and by offer service it.Finally, into next switch Controlling cycle.It is to be herein pointed out the possible more than one of the most short cell of average distance is obtained in step 4, now A unlatching can be randomly selected.Fig. 3 is the operational flowchart at cell end when opening cell.
CoMP technologies can be used to lift the spectrum efficiency of Cell Edge User and reduce inter-cell interference in LTE-A, will On geographical position separate multiple base stations operated, can cooperate with carry out data transmission to certain terminal or combine receive the terminal The data of transmission.It should be noted that in actual CoMP applications, the cell (or cell) of service is provided for single terminal Typically there are two to three, macrocell is included in it itself.Based on this characteristic, macrocell detects that those use CoMP skills first Art obtains the UE of service, then obtains the cell for being serviced for each UE simultaneously by above- mentioned information, can finally filter out two to Three cells that service is provided for most UE.For example, UE1 is connected by CoMP and SC1, SC2, MC, and (SC represents slight here Area, MC represents macrocell), UE2 is connected by CoMP and SC1, SC3, MC, and UE3 is connected by CoMP and SC1, MC, then for most One group of cell that many UE provide service is SC1 and MC.After the small district's groups are obtained, macrocell by detect its switch record or Small cell status record, and obtain each closing state cell to each cell member in the small district's groups with reference to network topology The distance of (or macrocell), and average distance is calculated with this, most after sent to the cell with most short average distance and open Open the trigger signal of (or wake up), after the closing state cell receives the signal sent from macrocell, will enter unlatching (or Wake up) process.It is normally-open and after working after the cell, selection and the process such as service switching are stayed again by carry out UE, for upper Stating the small district's groups for obtaining carries out service distributing, and sends the successful signal of unlatching to macrocell.So far, in a unlatching cycle All processes terminate.If it is pointed out that if the most short cell more than one of the foregoing average distance for obtaining, can be random Choose a unlatching.Fig. 4 gives the mistake for going out optimal cell to be opened using CoMP characteristics and average distance calculating sifting Journey.
For a further understanding of this programme, will be by Fig. 1 for example, SC01 and SC02 is in closing shape for example in figure State, finds out as most UE provide one group of cell (or macrocell) of service for MC0 by using CoMP technical characteristics, SC03 and SC15.When needing to open cell in MC0 coverages, SC02 will be opened by macro base station triggering control, because (the distance of SC02 to MC0To the distance of SC03To the distance of SC15The phase of)/3 Average distance for other cell to this threes being closed is minimum.If again for example, at SC21, SC22, SC24 In closed mode, the cell and macrocell respectively SC03 and MC2 of service are provided for most UE, then SC21 is due to most Short average distance and will be unlocked.Another more special example is, if SC14, SC15, SC16 are all in closed mode, and For cell and macrocell that most UE provide service are respectively SC02 and MC1, according to scheme proposed by the invention, SC14 or SC15 may be unlocked, and this kind of situation is mainly appeared under the very near scene of multiple closing state cell mutual distances, this When random selection one open (being assumed to be SC14).After normally-open, when next cycle arrives, if stilling need to carry out small Cell breakdown action, then by after series of steps, SC15 is then likely to be chosen again and open.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (5)

1. the cell open method that a kind of based on business load and most short average distance is calculated, it is characterised in that：In the method In, judge whether to carry out cell breakdown action first with traffic load information, then for the closed mode of candidate The more situation of small number of cells, it is special using CoMP (Coordinated Multiple Points cooperate with multicast communication) technology Property, the maximum one group of cell (may wherein include macrocell) of business load is found out, finally being closed in candidate Cell in selection and the group cell between have most short average distance cell as open object.
2. the cell open method that a kind of based on business load and most short average distance according to claim 1 is calculated, It is characterized in that：Described judges that whether to carry out cell breakdown action is specially using traffic load information：In network The set of business load amount relatively large cell and macrocell is chosen in coverage, is closed by contrast Each cell and the average distance of each element in the set, decide whether in the presence of the cell for being best suitable for opening and trigger life Order controls its unlatching；The load information of exchange only local (i.e. between each mutually adjacent macrocell and cell) and without The load information of all of cell and macro base station is collected in whole network aspect.
3. the cell open method that a kind of based on business load and most short average distance according to claim 2 is calculated, It is characterized in that：In the method, macrocell periodically obtain its lower each cell of control load information and itself Load information；Subsequently determine whether load more than threshold value λthresholdAnd the duration is more than TthresholdSmall number of cells account for always Whether the ratio for opening state cell exceedes thresholding P, and whether macrocell load is more than thresholding λMC-thresholdAnd the duration More than TMC-threshold；If above-mentioned two condition at least one meets, the action for carrying out opening cell is needed；Now, it is System should make unlatching judgement, and this target is realized to trigger cell that some is closed.
4. the cell open method that a kind of based on business load and most short average distance according to claim 1 is calculated, It is characterized in that：In the method, when needing to carry out cell breakdown action, macrocell switchs record or small by detecting it Cell status record learns which cell is in and closes state；If closing state cell only one of which, macrocell is directly sent out to it Send open signal；If more than one, maximum one group small of portfolio is judged using multicast communication CoMP technical characteristics are cooperateed with Area, then obtains each closed mode cell to the distance of each cell in this group of cell, and basis herein by network topology On calculate average distance, finally selection with most short average distance closing state cell and be turned on.
5. the cell open method that a kind of based on business load and most short average distance according to claim 1 is calculated, It is characterized in that：The method specifically includes following steps：
Step one：In LTE system, information exchange is realized by X2 interface between each cell；First, macro cell base station determines certainly Body load information, and the load information that each cell under its control is reported periodically is received by X2 interface；Assuming that The small cell cluster of unlatching state in certain macrocell network coverage is Son={ SC1, SC2..., SCM, the industry that collection is obtained Business load information is λTotsl={ λ1, λ2..., λM, macrocell own load information is λMC；Then, macro cell base station judges negative Carry and be more than threshold value λthresholdAnd the duration is more than TthresholdSmall number of cells account for total ratio for opening state cell and be It is no whether to be more than thresholding λ more than thresholding P, and macrocell loadMC-threshold, the duration is more than TMC-threshold；If above-mentioned Two condition at least one meet, then need the action for carrying out opening cell, i.e.,：
Or
λMC＞ λMC-threshold&&T>TMC-threshold
Wherein,The small number of cells of threshold value, M are respectively greater than for load and duration To open state cell sum；
Step 2：After macrocell has carried out the judging process of step one, if desired carry out cell breakdown action, macrocell from Know which cell is currently under closed mode in its record, if the cell for being currently in closed mode only has one, Then macrocell directly sends open signal to the cell, subsequently enters step 5；If the cell of candidate is more than one, grand Cell performs step 3；
Step 3：Macrocell determines that those use CoMP to obtain the UE of service, and can wherein choose all or part of UE, obtains Set UECoMP={ UE1, UE2..., UEX}；Then, detect successively to UEi(i=1,2 ..., X) a group slight for servicing is provided Area, the group cell for most UE due to providing service, and business load is most heavy, so be badly in need of unlatching cell carries out business to it Shunting, subsequently enters step 4；
Step 4：Due to known network topological condition, macrocell can show that each closes state cell in its record sheet SCoff={ SC1, SC2..., SClArrive set CHIn each cell distance, and calculate each closed mode cell and arrive The average distance of each cell, contrasts each in the slight district's groupsSystem (or control centre) will be to most short The cell being closed of average distance, i.e., to optimal cell to be opened
SC O P E N = min i ⋐ { 1 , 2 , ... , I } D a v g , SC i
Send and open trigger signal；
Step 5：The cell being closed by monitoring interface to after the open signal sent from macrocell, Into operating process is opened, after the cell is smoothly opened, sent to macrocell and open pass signal, macrocell will update SCoffWith SCon；Afterwards, the new cell opened will receive the business sent from high capacity cell (or macrocell) around it Handover information, part UE is switched on its service link, and by offer service it；Finally, into next switch control Cycle processed.
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