CN107484177A - A kind of method for realizing heterogeneous network down collaboration multi-point - Google Patents
A kind of method for realizing heterogeneous network down collaboration multi-point Download PDFInfo
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- CN107484177A CN107484177A CN201710669651.3A CN201710669651A CN107484177A CN 107484177 A CN107484177 A CN 107484177A CN 201710669651 A CN201710669651 A CN 201710669651A CN 107484177 A CN107484177 A CN 107484177A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
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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
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
Abstract
The present invention provides a kind of method for realizing heterogeneous network down collaboration multi-point, can effectively reduce inter-cell interference, lifts Cell Edge User spectrum efficiency and cell average spectral efficiency.Methods described includes：In possessing the different districts ID descending scene of heterogeneous network in base station and wireless remote, user selects access base station or wireless remote according to receiving power；Dried according to broadband letter than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user；Base station and wireless remote are divided into collaboration set, use the coordinated multi-point transmission method that joint transmission is combined with cooperative beam figuration to provide covering for the collaboration user in collaboration set.The present invention relates to wireless communication technology field.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relates to a kind of side for realizing heterogeneous network down collaboration multi-point
Method.
Background technology
In Long Term Evolution (Long Term Evolution, LTE) system, due to using OFDM
(Orthogonal Frequency Division Multiplexing, OFDM) technology, intra-cell interference is typically small, but by
In using identical networking technology, inter-cell interference turns into the main interference in LTE system, causes cell-edge performance poor.For
The performance of Cell Edge User is improved, meets the requirement of cell edge spectrum efficiency, long-term evolution upgrading (Long Term
Evolution-Advanced, LTE-A) cooperative multipoint transmission (Coordinated Multi-Points are introduced in system
Reception, CoMP) technology.Cooperative multipoint transmission (CoMP) technology is cooperated by multiple adjacent base stations or node, is simultaneously
One Cell Edge User provides service, to reduce co-channel interference of the Cell Edge User by adjacent cell, improves cell edge
The service quality of user.Wherein down collaboration multi-point (CoMP) technology is broadly divided into two major classes：Joint transmission (Joint
Transmission, JT) and cooperative scheduling/cooperative beam figuration (Coordinated Scheduling/Beamforming,
CS/CB)。
For joint transmission (JT), serving cell and cooperation cell are on identical running time-frequency resource simultaneously to same cell
Edge customer transmission identical physical down link sharing channel (Physical Downlink Shared Channel,
PDSCH) data, due to eliminating the co-channel interference of adjacent cell and the superposition of downstream signal, so as to lift Cell Edge User
Descending performance；For cooperative scheduling (CS), serving cell sends physical down link sharing channel to Cell Edge User
(PDSCH) data, cooperation cell do not send physical down link sharing channel (PDSCH) data in identical running time-frequency resource, from
And the co-channel interference of adjacent cell is eliminated, lift the descending performance of Cell Edge User；It is small for cooperative beam figuration (CB), service
Area and cooperation cell send downlink data, but serving cell users and association to respective user respectively on identical running time-frequency resource
Making the shaped-beam of community user needs to stagger, and so as to reduce mutual interference, and then is lifted under Cell Edge User
Row performance.
In down collaboration multi-point (CoMP) technology, joint transmission (JT) and cooperative scheduling (CS) are although can be effective
Reduce co-channel interference of the edge customer by user in adjacent cell, but need the extra running time-frequency resource taken in cooperation cell,
When cooperation cell load is larger, joint transmission (JT) and cooperative scheduling (CS) can reduce the average throughput of cooperation cell, this
Outer joint transmission (JT) needs to intercourse substantial amounts of data message between base station or node, and the time delay and backhaul for increasing X2 interface are held
Amount, influences the lifting of systematic function.And for cooperative beam figuration (CB), although being had no significant effect to cell average throughput,
But in the wireless channel environment and larger cell load of time-varying, due to needing to adjust collaboration user wave beam forming vector, meeting
The performance of system is reduced to a certain extent.
In the prior art, typically using a certain down collaboration multi-point (CoMP) mode (joint transmission (JT), cooperation
Dispatch (CS) or cooperative beam figuration (CB)), it is impossible to the change of dynamically adapting network environment, and in the wireless channel ring of time-varying
When border and larger cell load, system is difficult to play good performance.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method for realizing heterogeneous network down collaboration multi-point, with solution
Certainly present in prior art only with a certain down collaboration multi-point mode in the case where cell load is larger, system
The problem of poor performance.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of side for realizing heterogeneous network down collaboration multi-point
Method, including：
In possessing the different districts ID descending scene of heterogeneous network in base station and wireless remote, user selects according to receiving power
Access base station or wireless remote；
Dried according to broadband letter than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user,
Wherein, the broadband letter dries the work(for disturbing launch point than receiving the power of service transmission point for user and user receives
Rate and noise power and ratio；
Base station and wireless remote are divided into collaboration set, mutually tied with cooperative beam figuration using joint transmission in collaboration set
The coordinated multi-point transmission method of conjunction provides covering for the collaboration user.
Further, the receiving power includes：The radio remote that the power for the base station that user receives and user receive
The power at end and power offset sum；
The user selects access base station or wireless remote to include according to receiving power：
If the base station peak power that user receives is more than wireless remote peak power and the power excursion that user receives
Sum is measured, then user's access base station；
Otherwise, user accesses wireless remote.
Further, it is described to be dried according to broadband letter than the user of access base station or wireless remote is divided into collaboration user
Include with non-cooperating user：
When user's access base station, if the broadband letter of user is dried than being less than default base station threshold value, user is marked
For collaboration user, otherwise, non-cooperating user is marked the user as；
When user accesses wireless remote, if the broadband letter of user is dried than being less than default wireless remote threshold value,
Collaboration user is marked the user as, otherwise, marks the user as non-cooperating user.
Further, when when user's access base station, if the broadband letter of user is dried than being less than default base station threshold value,
Collaboration user is then marked the user as, otherwise, after marking the user as non-cooperating user, methods described also includes：
If user's access base station and be non-cooperating user, and the broadband letter of user is dried than being more than default first thresholding
Value, then user does not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；
If user's access base station and be collaboration user, and the broadband letter of user is dried than being more than default second threshold value,
Then user does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；
, wherein it is desired to the user of multipoint cooperative is final collaboration user.
Further, when user accesses wireless remote, dried if the broadband of user is believed than being less than default radio remote
End door limit value, then collaboration user is marked the user as, otherwise, after marking the user as non-cooperating user, methods described also includes：
If user accesses wireless remote and is non-cooperating user, and the broadband letter of user is dried than more than default 3rd
Limit value, then user do not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；
If user accesses wireless remote and is collaboration user, and the broadband letter of user is dried than being more than default 4th thresholding
Value, then user does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；
, wherein it is desired to the user of multipoint cooperative is final collaboration user.
Further, the coverage of each base station includes three sectors, placing in the coverage of each sector some
Individual wireless remote；
It is described base station and wireless remote are divided into collaboration set to include：
Wireless remote in three sectors and its coverage forms collaboration set, wherein, the sector includes：Different base station
In sector.
Further, it is described that base station and wireless remote are divided into collaboration set, using joint transmission and association in collaboration set
The coordinated multi-point transmission method being combined as wave beam forming provides covering for the collaboration user to be included：
Base station in collaboration user notice collaboration set needs to carry out multipoint cooperative to it, then in base station and its coverage
Wireless remote carries out joint transmission to the collaboration user；
In joint transmission, the efficient channel information for the base station i that user k is observed is calculated, wherein, user k is that base station i covers
Collaboration user in the range of lid；
The efficient channel information obtained according to observation calculates wave beam formed matrix, and wave beam formed matrix index is fed back to
Each base station in collaboration set；
Each base station collaboration selection wave beam formed matrix in collaboration set provides covering for the collaboration user.
Further, the efficient channel information for the base station i that the user k is observed is expressed as：
Wherein,Represent that user k observes base station i efficient channel information, Hk,iRepresent base station i to user k letter
Road, Hk,ijThe channel of the wireless remote ij to user k in cooperation centralized base-station i is represented, n is of wireless remote in collaboration set
Number.
Further, each base station collaboration selection wave beam formed matrix in the collaboration set provides for the collaboration user covers
Lid includes：
Each base station in collaboration set is based on peak signal leakage noise and selects optimum beam figuration matrix than criterion, cooperation,
Covering is provided for the collaboration user.
Further, the optimum beam figuration matrix is expressed as：
Wherein,The optimum beam figuration matrix of user k in the i coverages of base station is represented, optimum beam figuration matrix isCharacteristic vector corresponding to eigenvalue of maximum, Pk,iRepresent that user k is received to come from
The power of wireless remote in centralized base-station i and its coverage of cooperating,Represent all hairs in addition to the i of base station in collaboration set
Exit point is to the set of user k channel, σ2White noise acoustical power is represented,Representing matrixTransposition, m be launch point hair
Number of antennas is penetrated, I represents unit matrix,The efficient channel information for the base station i that user k is observed is represented,Represent
MatrixTransposition.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In such scheme, in base station and wireless remote possess the different districts ID descending scene of heterogeneous network, user according to
Receiving power selects access base station or wireless remote；Believed according to broadband and dried than the user of access base station or wireless remote is divided
For collaboration user and non-cooperating user, wherein, the broadband letter dries the power and use than receiving service transmission point for user
Family receive interference launch point power and noise power and ratio；Base station and wireless remote are divided into collaboration set,
The coordinated multi-point transmission method that joint transmission is combined with cooperative beam figuration is used to be carried for the collaboration user in collaboration set
For covering.So, in possessing the different districts ID descending scene of heterogeneous network in base station and wireless remote, more situation is being loaded
Under, using cell extension technology so that wireless remote can be that a part of load is shared in base station, obtain more collaboration users
Service；And collaboration user is directed to, and the coordinated multi-point transmission method being combined using joint transmission and cooperative beam figuration, Neng Gouyou
The reduction inter-cell interference of effect, so as to lift Cell Edge User spectrum efficiency and cell average spectral efficiency.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method provided in an embodiment of the present invention for realizing heterogeneous network down collaboration multi-point；
Fig. 2 is determination collaboration user provided in an embodiment of the present invention and the schematic flow sheet of non-cooperating user；
Fig. 3 is collaboration set schematic diagram provided in an embodiment of the present invention；
Fig. 4 is that the idiographic flow of the method provided in an embodiment of the present invention for realizing heterogeneous network down collaboration multi-point is illustrated
Figure；
Fig. 5 is Cell Edge User spectrum efficiency comparison diagram provided in an embodiment of the present invention；
Fig. 6 is cell average spectral efficiency comparison diagram provided in an embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The present invention is for existing existing larger in cell load only with a certain down collaboration multi-point mode
In the case of, the problem of systematic function difference, there is provided a kind of method for realizing heterogeneous network down collaboration multi-point.
Embodiment one
As shown in figure 1, the method provided in an embodiment of the present invention for realizing heterogeneous network down collaboration multi-point, including：
S101, in possessing different districts ID (unique identifier) the descending scene of heterogeneous network in base station and wireless remote, use
Family selects access base station or wireless remote according to receiving power；
S102, believed according to broadband and dried than the user of access base station or wireless remote is divided into collaboration user and non-cooperating
User, wherein, the broadband letter dries the interference transmitting than receiving the power of service transmission point for user and user receives
Point power and noise power and ratio；
S103, base station and wireless remote are divided into collaboration set, assigned in collaboration set using joint transmission and cooperative beam
The coordinated multi-point transmission method that shape is combined provides covering for the collaboration user.
The method for realizing heterogeneous network down collaboration multi-point described in the embodiment of the present invention, is gathered around in base station and wireless remote
Have in the different districts ID descending scene of heterogeneous network, user selects access base station or wireless remote according to receiving power；According to width
Take a message and dry than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user, wherein, the broadband
Letter dries the power and noise power that disturb launch point than receiving the power of service transmission point for user and user receives
Sum ratio；Base station and wireless remote are divided into collaboration set, using joint transmission and cooperative beam figuration in collaboration set
The coordinated multi-point transmission method being combined provides covering for the collaboration user.So, difference is possessed in base station and wireless remote
In the cell ID descending scene of heterogeneous network, in the case where load is more, using cell range expansion technique so that wireless remote
It can be that a part of load is shared in base station, be serviced more collaboration users；And collaboration user is directed to, using joint transmission
The coordinated multi-point transmission method being combined with cooperative beam figuration, it can effectively reduce inter-cell interference, so as to lift cell
Edge customer spectrum efficiency and cell average spectral efficiency.
In the present embodiment, as shown in Fig. 2 generation user at random, user's mobile management part in the network environment of deployment
Complete the management to the translational speed of user, moving direction and moving range.
In the present embodiment, user selects access base station or wireless remote according to receiving power, wherein, the receiving power refers to
Power of the transmission power after path loss, shadow fading, antenna gain.
In the present embodiment, in the receiving power of calculating wireless remote to user, it is necessary to manually add power offset, mesh
Be in order to expand the coverage of wireless remote, in the case where load of base station is excessive, the coverage extension of wireless remote
Be advantageous to share load of base station, so as to reach the effect of load balancing, actual receiving power does not simultaneously include offset, power excursion
Amount is contained only in access selected section, is not involved in broadband letter and dries the calculating of the further parts such as ratio.
In the present embodiment, the receiving power includes：The power for the base station that user receives and user receive wireless
The power of distal end and power offset sum.
In the present embodiment, as shown in Fig. 2 as an alternative embodiment, the user selects access base according to receiving power
Stand or wireless remote includes：
If the peak power p for the base station that user receiveseThe peak power and work(of the wireless remote received more than user
Rate offset sum ph, then user's access base station；Otherwise, user accesses wireless remote.
It is further, described in the embodiment of the foregoing method for realizing heterogeneous network down collaboration multi-point
Dried according to broadband letter includes than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user：
When user's access base station, if the broadband letter of user is dried than being less than default base station threshold value, user is marked
For collaboration user, otherwise, non-cooperating user is marked the user as；
When user accesses wireless remote, if the broadband letter of user is dried than being less than default wireless remote threshold value,
Collaboration user is marked the user as, otherwise, marks the user as non-cooperating user.
In the present embodiment, broadband letter is dried than characterizing far and near journey of the user distance service transmission point relative to interference launch point
Degree, its value are the power and noise power that disturb launch point that user receives the power of service transmission point and user receives
The ratio of sum, service transmission point and interference launch point be both probably base station, it is also possible to wireless remote.
In the present embodiment, non-cooperating user and collaboration user than are tentatively being marked the user as according to the letter drying of the broadband of user
Afterwards, also need to be believed according to the broadband of user and dry than judging whether user needs multipoint cooperative, i.e.,:Whether user is final cooperation
User or non-cooperating user.
In the embodiment of the foregoing method for realizing heterogeneous network down collaboration multi-point, further, working as
During user's access base station, if the broadband letter of user is dried than being less than default base station threshold value, collaboration user is marked the user as,
Otherwise, after marking the user as non-cooperating user, methods described also includes：
If user's access base station and be non-cooperating user, and the broadband letter of user is dried than being more than default first thresholding
Value, then user does not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；
If user's access base station and be collaboration user, and the broadband letter of user is dried than being more than default second threshold value,
Then user does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；
, wherein it is desired to the user of multipoint cooperative is final collaboration user.
In the present embodiment, if as shown in Fig. 2 user's access base station and be non-cooperating user, and the broadband letter drying of user
Than (SINR) be more than the first threshold value (such as：△e), then user does not need multipoint cooperative, if the broadband letter of user is dried than small
In equal to the first threshold value (△e), then user needs multipoint cooperative；
In the present embodiment, if user's access base station and be collaboration user, and the broadband letter of user is dried than being more than second
Limit value is (for example, 1.2 △e, wherein, 1.2 △ hereineIt is in order to avoid user ceaselessly assists in multipoint cooperative state and non-multiple spot
Make to be changed between state), then user does not need multipoint cooperative, if the broadband letter of user dries ratio and is less than or equal to the second thresholding
It is worth (1.2 △e), then user continues need for multipoint cooperative；, wherein it is desired to the user of multipoint cooperative is final collaboration user.
In the embodiment of the foregoing method for realizing heterogeneous network down collaboration multi-point, further, working as
When user accesses wireless remote, if the broadband letter of user is dried than being less than default wireless remote threshold value, mark the user as
Collaboration user, otherwise, after marking the user as non-cooperating user, methods described also includes：
If user accesses wireless remote and is non-cooperating user, and the broadband letter of user is dried than more than default 3rd
Limit value, then user do not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；
If user accesses wireless remote and is collaboration user, and the broadband letter of user is dried than being more than default 4th thresholding
Value, then user does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；
, wherein it is desired to the user of multipoint cooperative is final collaboration user.
In the present embodiment, if as shown in Fig. 2 user accesses wireless remote and is non-cooperating user, and the broadband of user is believed
Dry than being more than the 3rd threshold value (for example, △h), then user does not need multipoint cooperative, if the broadband letter of user is dried ratio and is less than
Equal to the 3rd threshold value (△h), then user needs multipoint cooperative；
In the present embodiment, if user accesses wireless remote and be collaboration user, and the broadband letter of user is dried than more than the
Four threshold values are (for example, 1.2 △h), then user does not need multipoint cooperative, if the broadband letter of user is dried than being less than or equal to the 4th
Limit value (1.2 △h), then user continues need for multipoint cooperative；Used, wherein it is desired to which the user of multipoint cooperative is final cooperation
Family.
In the embodiment of the foregoing method for realizing heterogeneous network down collaboration multi-point, further, each
The coverage of base station includes：Three sectors, the coverage of each sector is interior to place several wireless remotes；
It is described base station and wireless remote are divided into collaboration set to include：
Wireless remote in three sectors and its coverage forms collaboration set, wherein, the sector includes：Different base station
In sector.
In the present embodiment, in possessing the different districts ID descending scene of heterogeneous network in base station and wireless remote, it can use
Regular hexagonal represents the coverage of base station, and circle represents the coverage of wireless remote.The coverage of each base station is drawn
It is divided into three sectors, several (for example, two) wireless remotes is placed in the coverage of each sector, as shown in figure 3, cooperation
Concentration includes base station 1,2,3；By taking base station 1 as an example, base station 1 includes 3 sectors (1,2,3), sector 1 include wireless remote (11,
12), sector 2 includes wireless remote (21,22), and sector 3 includes wireless remote (31,32).
It is further, described in the embodiment of the foregoing method for realizing heterogeneous network down collaboration multi-point
Base station and wireless remote are divided into collaboration set, the multiple spot being combined in collaboration set using joint transmission with cooperative beam figuration
Cooperation transmission method provides covering for the collaboration user to be included：
Base station in collaboration user notice collaboration set needs to carry out multipoint cooperative to it, then in base station and its coverage
Wireless remote carries out joint transmission to the collaboration user；
In joint transmission, the efficient channel information for the base station i that user k is observed is calculated, wherein, user k is that base station i covers
Collaboration user in the range of lid；
The efficient channel information obtained according to observation calculates wave beam formed matrix, and wave beam formed matrix index is fed back to
Each base station in collaboration set；
Each base station collaboration selection wave beam formed matrix in collaboration set provides covering for the collaboration user.
The joint transmission proposed in the present embodiment refers to：In collaboration set, base station and the wireless remote in its coverage
Carry out joint transmission；Specifically：If user k is the collaboration user in the i coverages of base station, the base station i's that user k is observed
Efficient channel information is：
In formula (1),Represent the efficient channel information for the base station i that user k is observed, Hk,iRepresent base station i to user k
Channel, Hk,ijThe channel of the wireless remote ij to user k in cooperation centralized base-station i is represented, n is wireless remote in collaboration set
Number.
In the present embodiment, the efficient channel information of other base stations can be by same side in the collaboration set that user k is observed
Method calculates, then the reception signal for obtaining user k is：
In formula (2), Yk,iRepresent the reception signal of the user k in the i of base station, Mk,iRepresent the reception square of the user k in the i of base station
Battle array,The efficient channel information for the base station i that user k is observed is represented,Represent the effective letter for the base station l that user k is observed
Road information, Wk,iRepresent base station i to user k wave beam formed matrix, Wul,lRepresent base station l to user ulWave beam formed matrix,Represent base station m to user umWave beam formed matrix, Xk,iRepresent that base station i is sent to user k transmission signal,Table
Show that base station l is sent to user ulTransmission signal,Represent that base station m is sent to user umTransmission signal, ulRepresent l base stations
User in coverage, umRepresent the user in m base station ranges, Hk,mRepresent base station m to user k channel, nk,iTable
Show the white noise that user k is received, m is the transmitting antenna number of launch point；In formula (2), Section 1 characterizes what user k was received
Useful signal, Section 2 characterize the interference signal in the collaboration set that user k is received, and Section 3 characterizes the association that user k is received
Make the interference signal outside collecting, last represents the noise that user k is received.
The cooperative beam figuration proposed in the present embodiment refers to：In collaboration set each base station collaboration selection wave beam formed matrix with
Reduce the interference in collaboration set, i.e. Section 2 in formula (2), so as to reduce the interference suffered by collaboration user, lifting frequency spectrum effect
Rate.
In the present embodiment, it is preferable that each base station in collaboration set is based on peak signal leakage noise and selected than criterion cooperation
Optimum beam figuration matrix, does not consider receiving matrix, and the signal leakage noise ratio of the user k in the i coverages of base station is：
In formula (3), ulThe user in the l coverages of base station is represented,Represent user ulThe base station i's observed has
Channel information is imitated, | | | |FThe Fu Luobaini norms of a matrix are represented, obtain optimum beam figuration matrix：
Wherein,The optimum beam figuration matrix of user k in the i coverages of base station is represented, optimum beam figuration matrix isCharacteristic vector corresponding to eigenvalue of maximum, Pk,iRepresent that user k is received to come from
The power of wireless remote in centralized base-station i and its coverage of cooperating,Represent all hairs in addition to the i of base station in collaboration set
Exit point is to the set of user k channel, σ2White noise acoustical power is represented,Representing matrixTransposition, m be launch point transmitting
Number of antennas, I represent unit matrix,The efficient channel information for the base station i that user k is observed is represented,Represent square
Battle arrayTransposition.
In the present embodiment, noise is revealed than criterion cooperation selection optimum beam figuration matrix, Neng Gougeng based on peak signal
Good suppression inter-cell interference, lift Cell Edge User spectrum efficiency and cell average spectral efficiency.
In the present embodiment, receiving matrix Mk,iUsing least mean-square error balanced device (MMSE), according to determining for mean square error
Justice, minimize mean square error and obtain receiving matrix Mk,iFor：
In the present embodiment, determine whether launch point uses multipoint collaboration method according to the type of user.If the type of user
For collaboration user, then collaboration user notice base station needs to carry out it multipoint cooperative, its coverage in the notice collaboration set of base station
Two interior wireless remotes carry out joint transmission to collaboration user, and the efficient channel information that collaboration user obtains according to observation calculates
Wave beam formed matrix, and wave beam formed matrix is indexed to each base station fed back in collaboration set, each base station collaboration in collaboration set
Selection optimum beam figuration matrix provides covering for the collaboration user.
In the present embodiment, if the type of user is non-cooperating user, base station or wireless remote individually service the user.
Embodiment two
In the present embodiment, for the ease of understanding the method for realizing heterogeneous network down collaboration multi-point of the present embodiment offer
And its effect, the method for realizing heterogeneous network down collaboration multi-point that the present embodiment provides is done further in conjunction with embodiment
Explanation.
A kind of method for realizing heterogeneous network down collaboration multi-point is present embodiments provided, the descending scene of the heterogeneous network is retouched
What is stated is the descending scene that base station possesses different ID from wireless remote, and its simulation parameter is as shown in table 1.In this embodiment, with
Wireless remote in Fig. 1 in sector 1,6,8 and its coverage illustrates exemplified by forming collaboration set.
Table 1
| Parameter describes | Setting value |
| Centre frequency | 2GHz |
| Channel width | 20MHz |
| Cell deployment | 7 base stations, 21 sectors, 42 wireless remotes |
| Base station transmitting power | 46dBm |
| Wireless remote transmission power | 30dBm |
| Antenna for base station type | 3D antennas |
| Wireless remote antenna type | Omnidirectional antenna |
| Antenna configuration | 4TX/ base stations or wireless remote, 4RX/ user |
| Base station path loss model | 128.1+37.6lgd |
| Wireless remote path loss model | 140.7+36.7lgd |
| Shadow fading model | Average is 0, and the Lognormal shadowing that standard deviation is 8 declines |
| Channel model | ITU-R Pedestrian-B |
| Carrier To Noise Power Density | -174dBm/Hz |
| Receiving algorithm | Least mean-square error (MMSE) |
In the present embodiment, as shown in figure 4, after the parameters such as scene set, network topology, in the network environment of deployment with
Machine generates user, calculates power of the transmission power after path loss/large scale decline, shadow fading, antenna gain, user
Mobile management is partially completed the management of the translational speed to user, moving direction and moving range.In each Transmission Time Interval
(TTI) in, implementation step includes：
Step A, access base station or wireless remote are selected according to receiving power in User Access Module, user；
Step B, in collaboration user judging module, believed according to broadband and dried than the user of access base station or wireless remote is drawn
It is divided into collaboration user (CoMP UE) and non-cooperating user；
Step C, in collaboration set, coordinated multipoint transmission (CoMP) method for being combined using joint transmission with wave beam forming
Covering is provided for collaboration user (CoMP UE).
In the present embodiment, if user is non-cooperating user, base station or wireless remote individually service the user.If user is
Collaboration user, request carry out multipoint cooperative, then base station or wireless remote receive request/feedback of user, base station and wireless remote
Joint sends data, specifically：
If user k is the collaboration user in base station 1, the efficient channel information for the base station 1 that user k is observed is：
Correspondingly, user k is observed base station 2, the efficient channel of base station 3 can calculate in the same way, then user k
Reception signal be
Cooperative beam figuration refers to that each base station collaboration selection wave beam formed matrix is dry in collaboration set to reduce in collaboration set
Disturb, i.e. Section 2 in formula (7), so as to reduce the interference suffered by collaboration user, lift handling capacity.
In the present embodiment, using based on peak signal leakage noise ratio (SLNR) criterion cooperation selection optimum beam figuration square
Battle array, does not consider receiving matrix, and user k signal leakage noise ratio is
In formula (8), InCP={ 1,6,8 }, i=1, wave beam formed matrix is
Characteristic vector corresponding to eigenvalue of maximum, m are the transmitting antenna number of launch point.Receiving matrix is balanced using least mean-square error
Device (MMSE), minimum mean square error obtain receiving matrix and are
Corresponding to the above method, the present embodiment also provides a kind of device for realizing heterogeneous network down collaboration multi-point, bag
Include：User Access Module, collaboration user judging module and collaboration module；Wherein,
The User Access Module, for selecting access base station or wireless remote according to user's receiving power, if user connects
The power for receiving base station is more than the power for receiving wireless remote, user's access base station, otherwise accesses wireless remote.Wherein, use
One deviant of the extra addition of power that family receives wireless remote is used for coverage extension, in the situation that load of base station is excessive
Under, the extension of wireless remote scope is advantageous to share load of base station, reaches the effect of load balancing.
The collaboration user judging module, dried for being believed according to consumer wideband than judging whether user needs multiple spot to assist
Make.If user's access base station and be non-cooperating user, and broadband letter dries ratio and is more than threshold value △e, then user do not need multiple spot
Cooperation, if broadband letter, which dries ratio, is less than or equal to threshold value △e, then user need multipoint cooperative；If user's access base station and for association
Make user, and broadband letter dries ratio and is more than 1.2 △e(1.2 △ hereineIt is in order to avoid user is ceaselessly in multipoint cooperative state
Changed between non-multipoint cooperative state), then user does not need multipoint cooperative, if broadband letter is dried than being less than or equal to 1.2
△e, then user continue need for multipoint cooperative；If user accesses wireless remote and is non-cooperating user, and broadband letter is dried than big
In threshold value △h, then user does not need multipoint cooperative, if broadband letter, which dries ratio, is less than or equal to threshold value △h, then user's needs are more
Point cooperation；If user accesses wireless remote and is collaboration user, and broadband letter dries ratio and is more than 1.2 △h, then user need not be more
Point cooperation, if broadband letter, which dries ratio, is less than or equal to 1.2 △h, then user continue need for multipoint cooperative.Need the user of multipoint cooperative
As collaboration user.
The collaboration module, determine whether launch point uses multipoint collaboration method for the type according to user.Cooperation
User notifies base station to need to carry out it multipoint cooperative, and base station notifies two wireless remotes in its coverage to collaboration user
Joint transmission is carried out, collaboration user calculates wave beam formed matrix according to the efficient channel information of measurement, and by wave beam in collaboration set
Figuration matrix index feeds back to each base station in collaboration set, each base station collaboration selection optimum beam figuration matrix in collaboration set for
The collaboration user provides covering.
Finally, user calculate in this Transmission Time Interval channel quality information (including：User throughput), and will
Channel quality information feedback is to base station.In the simulation time of setting, recording simulation results, specifically：To each transmission time
Spectrum efficiency in interval adds and is averaged, and obtains Cell Edge User spectrum efficiency and cell average spectral efficiency.By Fig. 5,
Fig. 6 can be seen that the present embodiment and also provide a kind of method for realizing heterogeneous network down collaboration multi-point, can effectively be lifted small
Area edge user spectrum efficiency and cell average spectral efficiency.
In the present embodiment, after TTI number reaches default threshold value, computing system level simulation performance index (including：Handle up
Amount).
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. method for realizing heterogeneous network down collaboration multi-point, it is characterised in that including：In possessing the different districts ID descending scene of heterogeneous network in base station and wireless remote, user selects to access according to receiving power Base station or wireless remote；Dried according to broadband letter than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user, its In, the broadband letter dries the power for disturbing launch point than receiving the power of service transmission point for user and user receives With noise power and ratio；Base station and wireless remote are divided into collaboration set, are combined in collaboration set using joint transmission with cooperative beam figuration Coordinated multi-point transmission method provides covering for the collaboration user.
- 2. the method according to claim 1 for realizing heterogeneous network down collaboration multi-point, it is characterised in that the reception Power includes：The power for the wireless remote that the power for the base station that user receives and user receive and power offset sum；The user selects access base station or wireless remote to include according to receiving power：If the peak power for the base station that user receives is more than the peak power and power excursion for the wireless remote that user receives Sum is measured, then user's access base station；Otherwise, user accesses wireless remote.
- 3. the method according to claim 1 for realizing heterogeneous network down collaboration multi-point, it is characterised in that the basis Broadband letter drying includes than the user of access base station or wireless remote is divided into collaboration user and non-cooperating user：When user's access base station, if the broadband letter of user is dried than being less than default base station threshold value, mark the user as assisting Make user, otherwise, mark the user as non-cooperating user；When user accesses wireless remote, if the broadband letter of user is dried than being less than default wireless remote threshold value, mark User is collaboration user, otherwise, marks the user as non-cooperating user.
- 4. the method according to claim 3 for realizing heterogeneous network down collaboration multi-point, it is characterised in that working as user During access base station, if the broadband letter of user is dried than being less than default base station threshold value, collaboration user is marked the user as, it is no Then, after marking the user as non-cooperating user, methods described also includes：If user's access base station and be non-cooperating user, and the broadband letter of user is dried than being more than default first threshold value, then User does not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；If user's access base station and be collaboration user, and the broadband letter of user is dried than being more than default second threshold value, then is used Family does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；, wherein it is desired to the user of multipoint cooperative is final collaboration user.
- 5. the method according to claim 3 for realizing heterogeneous network down collaboration multi-point, it is characterised in that working as user When accessing wireless remote, if the broadband letter of user is dried than being less than default wireless remote threshold value, mark the user as cooperating User, otherwise, after marking the user as non-cooperating user, methods described also includes：If user accesses wireless remote and is non-cooperating user, and the broadband letter of user is dried than being more than default 3rd thresholding Value, then user does not need multipoint cooperative；Otherwise, then user needs multipoint cooperative；If user accesses wireless remote and is collaboration user, and the broadband letter of user is dried than being more than default 4th threshold value, Then user does not need multipoint cooperative, and otherwise, then user continues need for multipoint cooperative；, wherein it is desired to the user of multipoint cooperative is final collaboration user.
- 6. the method according to claim 1 for realizing heterogeneous network down collaboration multi-point, it is characterised in that each base station Coverage include：Three sectors, the coverage of each sector is interior to place several wireless remotes；It is described base station and wireless remote are divided into collaboration set to include：Wireless remote in three sectors and its coverage forms collaboration set, wherein, the sector includes：In different base station Sector.
- 7. the method according to claim 1 for realizing heterogeneous network down collaboration multi-point, it is characterised in that described by base Stand and wireless remote is divided into collaboration set, the multipoint cooperative being combined in collaboration set using joint transmission with cooperative beam figuration Transmission method provides covering for the collaboration user to be included：Collaboration user notice collaboration set in base station need to carry out multipoint cooperative to it, then base station with it is wireless in its coverage Distal end carries out joint transmission to the collaboration user；In joint transmission, the efficient channel information for the base station i that user k is observed is calculated, wherein, user k is that base station i covers model Enclose interior collaboration user；The efficient channel information obtained according to observation calculates wave beam formed matrix, and wave beam formed matrix index is fed back into cooperation Each base station concentrated；Each base station collaboration selection wave beam formed matrix in collaboration set provides covering for the collaboration user.
- 8. the method according to claim 7 for realizing heterogeneous network down collaboration multi-point, it is characterised in that the user The efficient channel information for the base station i that k is observed is expressed as：<mrow> <msubsup> <mi>H</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msubsup> <mo>=</mo> <msub> <mi>H</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>H</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mrow>Wherein,Represent that user k observes base station i efficient channel information, Hk,iRepresent base station i to user k channel, Hk,ij The channel of the wireless remote ij to user k in cooperation centralized base-station i is represented, n is the number of wireless remote in collaboration set.
- 9. the method according to claim 7 for realizing heterogeneous network down collaboration multi-point, it is characterised in that the cooperation Each base station collaboration selection wave beam formed matrix concentrated provides covering for the collaboration user to be included：Each base station in collaboration set is based on peak signal leakage noise than criterion, cooperation selection optimum beam figuration matrix, for institute State collaboration user and covering is provided.
- 10. the method according to claim 9 for realizing heterogeneous network down collaboration multi-point, it is characterised in that it is described most Good wave beam formed matrix is expressed as：<mrow> <msub> <mover> <mi>W</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mi>max</mi> <mi> </mi> <mi>e</mi> <mi>i</mi> <mi>g</mi> <mi>e</mi> <mi>n</mi> <mi>v</mi> <mi>e</mi> <mi>c</mi> <mi>t</mi> <mi>o</mi> <mi>r</mi> <mo>&lsqb;</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <msubsup> <mover> <mi>H</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> <mi>H</mi> </msubsup> <msub> <mover> <mi>H</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <mfrac> <msup> <mi>&sigma;</mi> <mn>2</mn> </msup> <mi>m</mi> </mfrac> <mi>I</mi> <mo>)</mo> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> <msub> <mi>P</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <msup> <mrow> <mo>(</mo> <msubsup> <mi>H</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msubsup> <mo>)</mo> </mrow> <mi>H</mi> </msup> <msubsup> <mi>H</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> <mrow> <mi>e</mi> <mi>f</mi> <mi>f</mi> </mrow> </msubsup> <mo>&rsqb;</mo> </mrow>Wherein,The optimum beam figuration matrix of user k in the i coverages of base station is represented, optimum beam figuration matrix isCharacteristic vector corresponding to eigenvalue of maximum, Pk,iRepresent that user k is received to come from The power of wireless remote in centralized base-station i and its coverage of cooperating,Represent all hairs in addition to the i of base station in collaboration set Exit point is to the set of user k channel, σ2White noise acoustical power is represented,Representing matrixTransposition, m be launch point hair Number of antennas is penetrated, I represents unit matrix,The efficient channel information for the base station i that user k is observed is represented,Represent MatrixTransposition.
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