CN108322271A - The dynamic clustering method of customer-centric based on load - Google Patents

The dynamic clustering method of customer-centric based on load Download PDF

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Publication number
CN108322271A
CN108322271A CN201810234242.5A CN201810234242A CN108322271A CN 108322271 A CN108322271 A CN 108322271A CN 201810234242 A CN201810234242 A CN 201810234242A CN 108322271 A CN108322271 A CN 108322271A
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user
base station
small base
network
serving
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CN108322271B (en
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李兴旺
李俊霞
陈晓平
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Henan University of Technology
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Henan University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • 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
    • H04W28/08—Load balancing or load distribution
    • H04W28/082—Load balancing or load distribution among bearers or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/32—Connectivity information management, e.g. connectivity discovery or connectivity update for defining a routing cluster membership

Abstract

The invention discloses a kind of dynamic clustering methods of the customer-centric based on load, are suitable for the super-intensive network using coordinated multipoint transmission.The corresponding path loss figure in small base station in tectonic network, for each user, all small base stations being connected with the small base station of cell where the user are found out in path loss figure, assign these small base stations as the alternative services base station of the user, user estimates alternative services base station to the channel fading coefficient of itself according to reference signal, and serving BS to be selected is selected from alternative services base station, the set that the serving BS to be selected of itself forms and serving BS to be selected are sent to master controller by each user to the channel fading coefficient of itself by one of those small base station, master controller is that each user selects serving BS cluster according to the rate requirement of the information and each user that receive.

Description

The dynamic clustering method of customer-centric based on load
Technical field
The present invention relates to the communications field, the dynamic clustering method of especially a kind of customer-centric based on load.
Background technology
Super-intensive network (UDN, Ultra Dense Network) is one of key technology of next generation mobile communication.UDN The small base station of the middle a large amount of low-power of deployment, can lifting system capacity, enhancing in-door covering, the raising availability of frequency spectrum.Due to small The distance between base station is close, if they use identical frequency range, can there is serious interference, therefore effective interference management Method is the hot spot of research.
Traditional interference management strategy, such as power control, the scheduling based on channel quality, although can be to a certain extent Inhibit intra-cell interference, but carry out interference control only in single subdistrict, the interaction of data cannot be carried out with neighboring community, to small The processing capacity of section interference is extremely limited.Coordinated multipoint transmission (CoMP, Coordinated Multiple Point) technology It is avoided that inter-cell interference by the data interaction between base station or converts interfering link to useful link, can effectively cut down Interference.
CoMP points are cooperative scheduling/cooperative beam figuration, dynamic node selects and joint transmission (JT, Joint Transmission).In cooperative scheduling/cooperative beam figuration pattern, the base station of cell provides service to the user where user, uses The scheduling at family and pre-coding scheme are by multiple base stations united determinations.In dynamic node selection mode, it is selected in multiple base stations In one be user's transmission data.In JT patterns, user data is shared in multiple base stations, while being user's transmission data, will do It disturbs link and is converted into useful link.In JT-CoMP, channel state information and user data are exchanged between base station, if all Small base station all cooperate, this needs too high backhaul link expense, if the base station of cooperation is less, cannot provide enough Gain, therefore the selection of cooperative cluster is most important.
Cluster-dividing method in JT-CoMP is that the method for user's selection serving BS cluster is divided into three kinds：Static clustering, half move State sub-clustering and dynamic clustering.Static clustering method is pre-designed and does not change over according to network structure and base station geographic position Fixation cooperative cluster, can the disadvantage is that do not consider the time-varying characteristics of fading channel its advantage is that easy to operate and operand is extremely low The cooperative gain of acquisition is limited.Half dynamic clustering is a kind of improvement of static clustering, and cooperative gain is higher than static clustering.Dynamically Sub-clustering periodically carries out sub-clustering according to the variation of channel state information and user location, can obtain higher cooperative gain, But this kind of sub-clustering complexity is higher.Dynamic clustering is divided into three classes：Network-centric dynamic clustering, customer-centric Dynamic clustering and mixing sub-clustering.In network-centric dynamic clustering, sub-clustering, each base station cluster packet are carried out to base station first Containing multiple base stations, suitable serving BS then is selected for the user in the base station cluster residing for user, this cluster-dividing method Complexity is relatively low, but cluster edge customer can be interfered by between serious cluster.The dynamic clustering of customer-centric according to The channel state information of user selects suitable serving BS cluster in all small base stations for user, this method can obtain compared with High Signal to Interference plus Noise Ratio and handling capacity, but complexity highest.During mixing sub-clustering is network-centric sub-clustering and is with user The combination of the sub-clustering of the heart can be adjusted with the variation of Network status, and compromise is obtained between complexity and cooperative gain.
Document " Load aware self-organising user-centric dynamic comp clustering For 5G networks " propose a kind of dynamic clustering method of the customer-centric based on load, and this method can significantly subtract Few number of users for failing to meet rate requirement because of load too high.It is mentioned in the document：This method is also to can be considered a kind of mixed Sub-clustering to be closed, network-centric sub-clustering is first carried out, the small base station in the same macro base station coverage area forms a base station cluster, Then the sub-clustering that customer-centric is carried out in the base station cluster selects serving BS cluster for each user.If however, at user In the boundary of macro base station coverage area, then the macro base station coverage area interior energy is less for the base station number of the user service, and Small base station in adjacent macro base station and the macro base station coverage area and closer with the user distance can cause the user sternly The interference of weight.
Invention content
The present invention proposes a kind of dynamic clustering method of the customer-centric based on load, is suitable for assisting using multiple spot Make the super-intensive network transmitted.
Realizing the technical thought of the present invention is：The corresponding path loss figure in small base station in tectonic network, for each use All small base stations being connected with the small base station of cell where the user are found out, these small base stations in family in path loss figure As the alternative services base station of the user, user estimates alternative services base station to the channel fading system of itself according to reference signal Number, and serving BS to be selected is selected from alternative services base station, the set that each user forms the serving BS to be selected of itself And serving BS to be selected is sent to master controller, center to the channel fading coefficient of itself by one of those small base station Controller is that each user selects serving BS cluster according to the rate requirement of the information and each user that receive.
In order to realize above-mentioned technical thought, the dynamic clustering side of the customer-centric proposed by the present invention based on load Method is suitable for the super-intensive network using CoMP, includes the following steps：
A, the corresponding path loss figure in small base station in tectonic network, the node in the figure correspond to small base station, and side corresponds to small Path loss between base station, if the path loss between small base station is less than pre-set loss thresholding, the two small bases Standing between corresponding node has a side, if the path loss between small base station is more than pre-set loss thresholding, the two There is no side between the corresponding node in small base station；
B finds out the institute being connected with the small base station of cell where the user for u-th of user in path loss figure There is small base station, these small base stations are placed on set QuIn, u=1,2 ..., U, U are the sum of user in the network, QuIn small base Station is the alternative services base station of u-th of user；
C, each small base station send reference signal with identical power, and u-th of user surveys according to the reference signal received It measures received signal power and estimates QuIn small base station to the channel fading coefficient of itself, u=1,2 ..., U, U is the network The sum of middle user；
D, multiple received signal powers that u-th of user obtains step C measurements are compared with pre-set power threshold Compared with, select and receive the corresponding small base stations of signal more than several of power threshold, and by the sequence of power from big to small by it Corresponding small base station be successively placed on set PuIn,PuIn the small base of element representation It stands, ukIt is PuThe sum of middle element, ukNo more than QuThe sum of middle element, u=1,2 ..., U, U are the total of user in the network Number, PuIn small base station be u-th of user serving BS to be selected；
E, u-th of user will set PuAnd the P that step C is estimateduEach of small base station to the channel fading of itself Coefficient is sent to small base station BSu,1, small base station BSu,1These information received are sent to master controller；
F, the P that rate requirement of the master controller based on each user, step E are receiveduIt is every with channel fading coefficient A user selects serving BS；
G, master controller is according to NuFind user's set V of j-th small base station servicej, and by VjIt is sent to j-th small Base station, j-th small base station and set VjIn user interactive data, j=1,2 ..., J, J is the sum of small base station in the network.
Further, the step F is specifically included：
F1 uses NuIndicate the serving BS cluster of u-th of user, NuFor empty set, it is empty set, u=1,2 ..., U, U to enable set M It is the sum of user in the network；
F2, by small base station BSu,1It is added to the serving BS cluster N of u-th of useru, master controller is according to known channel Fading coefficients calculate the rate r of u-th of user at this timeu,1, u=1,2 ..., U, U is the sum of user in the network, enables i=2；
F3 is used | Pu︱ indicates set PuGesture, if | Pu︱ >=i, master controller consider small base station BSu,iAs u-th Not in set M, U is the sum of user in the network by the serving BS of user, u=1,2 ..., U and u, master controller according to Known channel fading coefficient calculates the rate r of u-th of user at this timeu,i；
F4 compares ru,i-1、ru,iAnd du, duIt is the minimum speed limit demand of u-th of user, if ru,i-1＞ ru,i, then not small Base station BSu,iIt is added to the serving BS cluster N of u-th of useruAnd u is put into set M, if du>ru,i>ru,i-1Or ru,i>du> ru,i-1, then by small base station BSu,iIt is added to the serving BS cluster N of u-th of useruIf ru,2>ru,1>du, then not small base station BSu,iIt is added to the serving BS cluster N of u-th of useru, enable i=i+1, u=1,2 ..., U, U are the sums of user in the network；
F5 repeats step F3 and F4, until i ＞ max | Pu︱, u=1,2 ..., U and u be not in set M }, U is the net The sum of user in network.
In the present invention, for each user, the small base station phase with cell where the user is found out in path loss figure All small base stations even, assign these small base stations as the alternative services base station of the user, these small base stations are not limited to single macro In the coverage area of base station, it is also possible in multiple macro base stations coverage area in, as long as between user channel quality compared with The alternative services base station of the user is all regarded in good small base station, overcomes document " Load aware self-organising Deficiency in user-centric dynamic comp clustering for 5G networks ".
Description of the drawings
Fig. 1 is the path loss figure of the embodiment of the present invention；
Fig. 2 is the flow chart of the present invention；
Fig. 3 is that the present invention is the flow chart that each user selects serving BS cluster.
Specific implementation mode
A kind of embodiment of the present invention is given below, the present invention will be further described in detail.Consider to include several The super-intensive network of small base station and multiple users, each there are one small base station, small base station and user's all random distributions in cell In the network.Each small base station is connected by backhaul link with master controller.
The corresponding path loss figure in small base station in master controller tectonic network first, as shown in Figure 1, the section in the figure The corresponding small base station of point, while the path loss between small base station is corresponded to, if the path loss between small base station is less than pre-set Thresholding is lost, then has a side between the corresponding node in the two small base stations, is set in advance if the path loss between small base station is more than The loss thresholding set then does not have side between the corresponding node in the two small base stations.As embodiment, there are 24 small base stations in Fig. 1, Circle represents small base station, and the number in circle represents the serial number of small base station, uses BSjIndicate j-th small base station, j=1,2 ..., 24。
U-th of user is needed if master controller selects serving BS from all small base stations for the user Known each small base station is to the channel fading coefficient of the user, this needs higher backhaul link, and u=1,2 ..., U, U is the net The sum of user in network.If some small base station farther out, can not possibly be used at a distance from u-th of user in the small base station as u-th In the case of the serving BS at family, still to master controller send the small base station to u-th of user channel fading coefficient, then The waste of link circuit resource can be caused, does not exchange any gain for, therefore, it is not necessary to by all small base stations as u-th of use The alternative services base station at family.WithThe small base station of cell where indicating u-th of user, in path loss figure, if certain small Base station withBe connected, then these small base stations withBetween path loss it is smaller, channel quality is higher, similarly, these small bases It stands also higher with the channel quality of u-th of user, therefore, it is necessary to these small base stations are regarded to the alternative services base of u-th of user It stands.If in path loss figure some small base station withBe not attached to, then the small base station withBetween path loss it is larger, The small base station and the channel quality of u-th of user are poor, it is not necessary that the small base station is regarded to the alternative services base of u-th of user It stands.
For u-th of user, found out in path loss figure be connected with the small base station of cell where the user it is all These small base stations are placed on set by small base stationIn,In small base station be u-th of user alternative services base station.It is The set of the alternative services base station composition of u-th of user.Work as kuValue be respectively 1,2 ..., when 24,As follows.
Q1={ BS2,BS7,BS8}
Q2={ BS1,BS3,BS7,BS10}
Q3={ BS2,BS4,BS10}
Q4={ BS3,BS5,BS6,BS11}
Q5={ BS4,BS11,BS12}
Q6={ BS4,BS10,BS14}
Q7={ BS1,BS2,BS8,BS16}
Q8={ BS1,BS7,BS9}
Q9={ BS8,BS16}
Q10={ BS2,BS3,BS6,BS14,BS15,BS17}
Q11={ BS4,BS5,BS13,BS14}
Q12={ BS5,BS13}
Q13={ BS11,BS12,BS14,BS18,BS19}
Q14={ BS6,BS10,BS11,BS13,BS17,BS18,BS21}
Q15={ BS2,BS10,BS17,BS16,BS22}
Q16={ BS7,BS9,BS15,BS22}
Q17={ BS10,BS14,BS15,BS22,BS24}
Q18={ BS13,BS14,BS19,BS20}
Q19={ BS13,BS18,BS20}
Q20={ BS18,BS19,BS21,BS24}
Q21={ BS14,BS20,BS24}
Q22={ BS15,BS16,BS17,BS23,BS24}
Q23={ BS22,BS24}
Q24={ BS17,BS20,BS21,BS22,BS23}
Each small base station sends reference signal with identical power, and u-th of user measures according to the reference signal received It received signal power and estimatesIn small base station to the channel fading coefficient of itself, u=1,2 ..., U, U is in the network The sum of user.U-th of user compares obtained multiple received signal powers are measured with pre-set power threshold, selects Go out to be more than several corresponding small base stations of reception signal of power threshold, and corresponds to them by the sequence of power from big to small Small base station be successively placed on set PuIn,PuIn the small base station of element representation, ukIt is Pu The sum of middle element.Set PuIn small base station and the channel quality of u-th of user it is preferable, be the service to be selected of u-th of user Base station.
When master controller is that each user selects serving BS cluster, known collection P is neededuAnd set PuIn small base It stands to the channel fading coefficient of u-th of user.U-th of user will set PuAnd the P that estimation obtainsuEach of small base station arrive The channel fading coefficient of itself is sent to small base station BSu,1, small base station BSu,1These information received are sent to center control Device.
Rate requirement of the master controller based on each user, set PuWith set PuIn small base station to u-th user's Channel fading coefficient is that each user selects serving BS cluster, and u=1,2 ..., U, U is the sum of user in the network, specific mistake Journey is as follows：
Step 1, N is useduIndicate the serving BS cluster of u-th of user, NuFor empty set, enable set M for empty set, u=1,2 ..., U, U are the sums of user in the network；
Step 2, by small base station BSu,1It is added to the serving BS cluster N of u-th of useru, master controller is known to Channel fading coefficient calculates the rate r of u-th of user at this timeu,1, u=1,2 ..., U, U is the sum of user in the network, enables i =2；
Step 3, use | Pu︱ indicates set PuGesture, if | Pu︱ >=i, master controller consider small base station BSu,iAs u Not in set M, U is the sum of user in the network, master controller root by the serving BS of a user, u=1,2 ..., U and u The rate r of u-th of user at this time is calculated according to known channel fading coefficientu,i；
Step 4, compare ru,i-1、ru,iAnd du, duIt is the minimum speed limit demand of u-th of user, if ru,i-1＞ ru,i, then not Small base station BSu,iIt is added to the serving BS cluster N of u-th of useruAnd u is put into set M, if du>ru,i>ru,i-1Or ru,i>du> ru,i-1, then by small base station BSu,iIt is added to the serving BS cluster N of u-th of useruIf ru,2>ru,1>du, then not small base station BSu,iIt is added to the serving BS cluster N of u-th of useru, enable i=i+1, u=1,2 ..., U, U are the sums of user in the network；
Step 5, step F3 and F4 are repeated, until i ＞ max | Pu︱, u=1,2 ..., U and u be not in set M }, U is this The sum of user in network.
Master controller is according to NuFind user's set V of j-th small base station servicej, and by VjIt is sent to j-th small base It stands, j-th small base station and set VjIn user interactive data, j=1,2 ..., 24.
In conjunction with flow chart, that is, Fig. 2 of the present invention, the specific step of the dynamic clustering method of the customer-centric based on load It is rapid as follows：
A, the corresponding path loss figure in small base station in tectonic network, the node in the figure correspond to small base station, and side corresponds to small Path loss between base station, if the path loss between small base station is less than pre-set loss thresholding, the two small bases Standing between corresponding node has a side, if the path loss between small base station is more than pre-set loss thresholding, the two There is no side between the corresponding node in small base station；
B finds out the institute being connected with the small base station of cell where the user for u-th of user in path loss figure There is small base station, these small base stations are placed on set QuIn, u=1,2 ..., U, U are the sum of user in the network, QuIn small base Station is the alternative services base station of u-th of user；
C, each small base station send reference signal with identical power, and u-th of user surveys according to the reference signal received It measures received signal power and estimates QuIn small base station to the channel fading coefficient of itself, u=1,2 ..., U, U is the network The sum of middle user；
D, multiple received signal powers that u-th of user obtains step C measurements are compared with pre-set power threshold Compared with, select and receive the corresponding small base stations of signal more than several of power threshold, and by the sequence of power from big to small by it Corresponding small base station be successively placed on set PuIn,PuIn the small base of element representation It stands, ukIt is PuThe sum of middle element, ukNo more than QuThe sum of middle element, u=1,2 ..., U, U are the total of user in the network Number, PuIn small base station be u-th of user serving BS to be selected；
E, u-th of user will set PuAnd the P that step C is estimateduEach of small base station to the channel fading of itself Coefficient is sent to small base station BSu,1, small base station BSu,1These information received are sent to master controller；
F, the P that rate requirement of the master controller based on each user, step E are receiveduIt is every with channel fading coefficient A user selects serving BS；
G, master controller is according to NuFind user's set V of j-th small base station servicej, and by VjIt is sent to j-th small Base station, j-th small base station and set VjIn user interactive data, j=1,2 ..., J, J is the sum of small base station in the network.
It is flow chart i.e. Fig. 3 that each user selects serving BS cluster in conjunction with the present invention, service is selected for each user Base station cluster is as follows：
F1 uses NuIndicate the serving BS cluster of u-th of user, NuFor empty set, it is empty set, u=1,2 ..., U, U to enable set M It is the sum of user in the network；
F2, by small base station BSu,1It is added to the serving BS cluster N of u-th of useru, master controller is according to known channel Fading coefficients calculate the rate r of u-th of user at this timeu,1, u=1,2 ..., U, U is the sum of user in the network, enables i=2；
F3 is used | Pu︱ indicates set PuGesture, if | Pu︱ >=i, master controller consider small base station BSu,iAs u-th Not in set M, U is the sum of user in the network by the serving BS of user, u=1,2 ..., U and u, master controller according to Known channel fading coefficient calculates the rate r of u-th of user at this timeu,i；
F4 compares ru,i-1、ru,iAnd du, duIt is the minimum speed limit demand of u-th of user, if ru,i-1＞ ru,i, then not small Base station BSu,iIt is added to the serving BS cluster N of u-th of useruAnd u is put into set M, if du>ru,i>ru,i-1Or ru,i>du> ru,i-1, then by small base station BSu,iIt is added to the serving BS cluster N of u-th of useruIf ru,2>ru,1>du, then not small base station BSu,iIt is added to the serving BS cluster N of u-th of useru, enable i=i+1, u=1,2 ..., U, U are the sums of user in the network；
F5 repeats step F3 and F4, until i ＞ max | Pu︱, u=1,2 ..., U and u be not in set M }, U is the net The sum of user in network.
Above example is only to the present invention's for example, those skilled in the art can carry out respectively the present invention Kind modification and variation is without departing from the spirit and scope of the present invention.In this way, if these modifications and changes of the present invention belongs to this Within the scope of invention claim and its equivalent technologies, then the present invention is also intended to include these modifications and variations.

Claims (1)

1. the dynamic clustering method of the customer-centric based on load is applicable in the super-intensive network using coordinated multipoint transmission, It is characterized in that：Include the following steps：
A, the corresponding path loss figure in small base station in tectonic network, the node in the figure correspond to small base station, and side corresponds to small base station Between path loss, if path loss between small base station is less than pre-set loss thresholding, the two small base stations pair There is a side between the node answered, if the path loss between small base station is more than pre-set loss thresholding, the two small bases Standing between corresponding node does not have side；
B, for u-th of user, found out in path loss figure be connected with the small base station of cell where the user it is all small These small base stations are placed on set Q by base stationuIn, u=1,2 ..., U, U are the sum of user in the network, QuIn small base station be The alternative services base station of u-th of user；
C, each small base station send reference signal with identical power, and u-th of user connects according to the reference signal measurement received It receives signal power and estimates QuIn small base station to the channel fading coefficient of itself, u=1,2 ..., U, U is used in the network The sum at family；
D, u-th of user compare multiple received signal powers that step C measurements obtain with pre-set power threshold, choosing Go out to be more than several corresponding small base stations of reception signal of power threshold, and corresponds to them by the sequence of power from big to small Small base station be successively placed on set PuIn,PuIn the small base station of element representation, ukIt is Pu The sum of middle element, ukNo more than QuThe sum of middle element, u=1,2 ..., U, U are the sum of user in the network, PuIn it is small Base station is the serving BS to be selected of u-th of user；
E, u-th of user will set PuAnd the P that step C is estimateduEach of small base station to the channel fading coefficient of itself It is sent to small base station BSu,1, small base station BSu,1These information received are sent to master controller；
F, the P that rate requirement of the master controller based on each user, step E are receiveduIt is each user with channel fading coefficient Select serving BS, detailed process as follows：
F1 uses NuIndicate the serving BS cluster of u-th of user, NuFor empty set, it is empty set to enable set M, and u=1,2 ..., U, U is this The sum of user in network；
F2, by small base station BSu,1It is added to the serving BS cluster N of u-th of useru, master controller is according to known channel fading Coefficient calculates the rate r of u-th of user at this timeu,1, u=1,2 ..., U, U is the sum of user in the network, enables i=2；
F3 is used | Pu︱ indicates set PuGesture, if | Pu︱ >=i, master controller consider small base station BSu,iAs u-th of user Serving BS, u=1,2 ..., U and u is not in set M, U is the sum of user in the network, and master controller is known to Channel fading coefficient calculate the rate r of u-th of user at this timeu,i；
F4 compares ru,i-1、ru,iAnd du, duIt is the minimum speed limit demand of u-th of user, if ru,i-1＞ ru,i, then not small base station BSu,iIt is added to the serving BS cluster N of u-th of useruAnd u is put into set M, if du>ru,i>ru,i-1Or ru,i>du>ru,i-1, Then by small base station BSu,iIt is added to the serving BS cluster N of u-th of useruIf ru,2>ru,1>du, then not small base station BSu,iIt is added To the serving BS cluster N of u-th of useru, enable i=i+1, u=1,2 ..., U, U are the sums of user in the network；
F5 repeats step F3 and F4, until i ＞ max | Pu︱, u=1,2 ..., U and u be not in set M }, U is used in the network The sum at family；
G, master controller is according to NuFind user's set V of j-th small base station servicej, and by VjIt is sent to j-th small base station, J-th small base station and set VjIn user interactive data, j=1,2 ..., J, J is the sum of small base station in the network.
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