CN102726084B - Frequency reuse method and device - Google Patents
Frequency reuse method and device Download PDFInfo
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- CN102726084B CN102726084B CN201080062168.5A CN201080062168A CN102726084B CN 102726084 B CN102726084 B CN 102726084B CN 201080062168 A CN201080062168 A CN 201080062168A CN 102726084 B CN102726084 B CN 102726084B
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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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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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
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
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Abstract
A frequency reuse method for a heterogeneous network and a device thereof are disclosed. The method includes steps of: determining an adjacent cell of a current cell; receiving information associated with the edge frequency band of the adjacent cell; and enabling the micro base station of the current cell to reuse the edge frequency band of the adjacent cell based on the received information. The method can apparently reduce inter-cell interference and improve throughput of user equipment.
Description
Technical field
The present invention relates generally to frequency reuse technique, the frequency reuse approach and the equipment that are improved the receptivity of Cell Edge User equipment by little interference coordination particularly in heterogeneous wireless communication system.
Background technology
In multi-cell wireless communication networks, when neighbor cell can cause presence of intercell interference to during each user equipment allocation same frequency band.At present, the three kinds of main paties alleviating presence of intercell interference are: interference randomization, presence of intercell interference are offset and Inter-Cell Interference Coordination (inter-cellinterference coordination, is abbreviated as ICIC).Because presence of intercell interference randomization can not reduce interference, and inter-cell interference cancellation only can eliminate dominant interference, attentiveness is placed on the ICIC strategy finding best effectively reuse factor and is counted as the mode of most future and is studied widely in 3GPP (third generation Partnership Program) LTE (Long Term Evolution).
ICIC scheme by coordinating to obtain more excellent reuse factor to frequency and power division, to realize better network performance.Most of ICIC scheme is all based on fractional frequency reuse (fractional frequency reuse, is abbreviated as FFR) principle.The principle of FFR adopts different frequency re-use factor according to the channel condition of various subscriber equipment and disturbed condition.Such as, all subcarriers are divided into some reuse group, different reuse group corresponds to different reuse factor.In addition, FFR method also can adopt different transmitting powers to control, to carry out inter-cell coordination to different subcarrier groups.
Along with the increase of the demand to data, services, heterogeneous network (heterogeneousnetwork, be abbreviated as HetNet) as the effective ways improving power system capacity and coverage rate, added 3GPP LTE-Advanced (LTE evolution) by as a research project.Heterogeneous network has many low power nodes (being abbreviated as LPN) usually, such as pico, hotzone, femto and relay station (Relay nodes, is abbreviated as RN) etc.Compared with homogeneous network, the presence of intercell interference situation of heterogeneous network is even more serious.But there be limited evidence currently of has document to relate to how to coordinate interference between heterogeneous network small area.
Therefore need a kind of efficient wireless resource management algorithm in order to alleviate the presence of intercell interference in heterogeneous network.
Summary of the invention
For above problem, the invention provides the frequency reuse approach in heterogeneous wireless communication system and equipment, for alleviating the presence of intercell interference in heterogeneous network.
According to a first aspect of the invention, provide a kind of frequency reuse approach for heterogeneous network, comprise step: the neighbor cell determining current area; Receive the information relevant to the edge band of neighbor cell; Based on received information, micro-base station of current area is made to reuse the edge band of neighbor cell.
According to a second aspect of the invention, provide a kind of frequency reuse equipment for heterogeneous network, comprising: determining unit, for determining the neighbor cell of current area; Receiving element, for receiving the information relevant to the edge band of neighbor cell; Reuse unit, the information for receiving based on receiving element makes micro-base station of current area reuse the edge band of neighbor cell.
According to a third aspect of the invention we, provide a kind of node, this node can comprise equipment described according to a second aspect of the invention.
Accompanying drawing explanation
By the description of the following embodiment to the explanation principle of the invention, and by reference to the accompanying drawings, other objects of the present invention and effect will become clearly and easy to understand, wherein:
Fig. 1 shows a kind of exemplary heterogeneous network;
Fig. 2 is the block diagram of the frequency reuse equipment for heterogeneous network according to an embodiment of the invention;
Fig. 3 is the flow chart of the frequency reuse approach for heterogeneous network according to an embodiment of the invention;
Fig. 4 is the block diagram of the frequency reuse equipment for heterogeneous network according to another embodiment of the invention;
Fig. 5 is the flow chart of the frequency reuse approach for heterogeneous network according to another embodiment of the invention;
Fig. 6 is the flow chart of the frequency reuse approach for heterogeneous network according to another embodiment of the invention;
Fig. 7 is the flow chart that the method for maximum neighbor cell is disturbed in a micro-base station for determining current area according to an embodiment of the invention;
Fig. 8 is the flow chart disturbing the method for maximum neighbor cell for the micro-base station determining current area according to another embodiment of the invention;
Fig. 9 A shows frequency and the power management schematic diagram of macro base station according to another embodiment of the invention;
Fig. 9 B shows the frequency reuse result of method according to Fig. 5;
Fig. 9 C shows the frequency reuse result of method according to Fig. 6;
Figure 10 shows comparing the simulation result of method according to Fig. 5 and prior art; And
Figure 11 shows comparing the simulation result of method according to Fig. 6 and prior art.
In all above-mentioned accompanying drawings, identical Reference numeral represents to have identical, similar or corresponding feature or function.
Specific embodiment
Below in conjunction with accompanying drawing the present invention be explained in more detail and illustrate.Should be understood that, drawings and Examples of the present invention, only for exemplary effect, are not for limiting the scope of the invention.
First, Fig. 1 shows the schematic diagram that the present invention can be applied to one of them heterogeneous network.
In the present invention, the reference signal power size that the subscriber equipment of directly serving according to macro base station receives from this macro base station is this user equipment allocation frequency spectrum resource.Specifically, the subscriber equipment that macro base station directly can be served to the macro base station in community sends reference signal, if the signal power that subscriber equipment receives from macro base station is larger, such as be greater than certain predetermined power threshold, then can think that this subscriber equipment is in the interior zone of the coverage of macro base station, then this subscriber equipment can be categorized as Cell Center User, the frequency band that the communication between this subscriber equipment and macro base station uses is called center frequency-band.If the signal power that subscriber equipment receives from macro base station is less, such as be less than certain predetermined power threshold, then can think that this subscriber equipment is in the fringe region of the coverage of macro base station, then this subscriber equipment can be categorized as Cell Edge User, the frequency band that the communication between this subscriber equipment and macro base station uses is called edge band.Also namely, macro base station is the user equipment allocation edge band that the reference signal power received is less than predetermined power threshold, for the reference signal power received is more than or equal to the user equipment allocation center frequency-band of predetermined power threshold.
In addition, the frequency of the frequency of the edge band of current area and the edge band of neighbor cell is mutually orthogonal.Such as, the edge band with the macro base station of three sectors can be 1/3 of available band, and is orthogonal to the edge band of neighbor cell.Now Cell Edge User equipment is restricted to and can only uses this sub-band.2/3 available band that community is left can be used as the center frequency-band that Cell Center User equipment uses.Because a center of housing estate frequency band may reuse same frequency resource with the edge band of neighbor cell, so the power ratio corresponding with the edge band of each community power corresponding with the center frequency-band of this community is higher, thus avoid presence of intercell interference.
It should be noted that it also can be used by Intra-cell subscriber equipment when edge band is not by Cell Edge User hold facility.
Current heterogeneous network has many low power nodes (lower-power nodes, is abbreviated as LPN) (such as pico, hotzone, femto and relay station etc.) usually, is called micro-base station in the present invention.In specific implementation, micro-base station can be the low power nodes being directly connected to core net; Also can be used as via node, by the communication repeating of its user terminal to macro base station, realize the user terminal of LPN and the communication of macro base station.
The interference of two aspects is mainly discussed in the present invention, and first aspect is the interference from neighbor cell that Cell Edge User equipment is subject to, and second aspect is the interference that micro-base station user equipment is subject to.
The exemplarily object of property, will have LTE (Long Term Evolution) FDD (Frequency Division Duplexing (FDD)) downlink transfer of 10MHz system bandwidth as an example in FIG.
The heterogeneous network of Fig. 1 comprises 0A, 0B, 0C, 1A, 1B, 1C ..., 6A, 6B, 6C Gong21Ge community.Community 0A, 0B, 0C can share a macro base station, and macro base station can be such as evolved base station (also referred to as eNodeB or eNB), such as, eNB0 shown in Fig. 1, eNB1 ..., eNB6.Each sector of described cell base station has the directional antenna that angle is 120 °.Such as, eNB0 can be communicated with the user terminal in community 0A, 0B, 0C respectively by three directional antennas, thus is formed as the sector of three around eNB0.
In the heterogeneous network of Fig. 1, suppose that each community has several Physical Resource Block (PRB) respectively.In addition, suppose that PRB in each cell can be divided in three orthogonal frequency band F1, F2 and F3.Fig. 9 A shows the frequency with the macro base station of three sectors (corresponding to community 0A, 0B, 0C) in Fig. 1 and power management schematic diagram, and wherein, the edge band 901 of community 0A corresponds to F1, and center frequency-band 902 comprises F2 and F3; The edge band 903 of community 0B corresponds to F2, and center frequency-band 904 comprises F1 and F3; The edge band 905 of community 0C corresponds to F3, and center frequency-band 906 comprises F1 and F2.
In the present invention, micro-base station can be the low power nodes of such as pico, hotzone or via node etc. and so on, is positioned at LPN1 and LPN2 of cell edge in such as, heterogeneous network shown in Fig. 1.Reception/the transmit antenna of LPN and subscriber equipment can be omnibearing.
It is pointed out that and of the present inventionly above suppose and be limited only to exemplary illustration, and should not be construed as limitation of the present invention.
Fig. 2 is the block diagram of the frequency reuse equipment 200 for heterogeneous network according to an embodiment of the invention.Equipment 200 can comprise: determining unit 210, for determining the neighbor cell of current area; Receiving element 220, for receiving the information relevant to the edge band of neighbor cell; Reuse unit 230, the information for receiving based on described receiving element makes micro-base station of current area reuse the edge band of described neighbor cell.
In the present invention, frequency reuse equipment 200 can be a common control equipment of the mark, resource allocation information, actual service condition, real-time modification information etc. of all devices can known in this heterogeneous network.Such as, frequency reuse equipment 200 can be the macro base station that in network one has comprehensive functional, also can be one independent of other nodes of base station and subscriber equipment, also can comprise in addition in a node in a network.
Fig. 3 is the flow chart of the frequency reuse approach for heterogeneous network according to an embodiment of the invention.It is pointed out that each step shown in Fig. 3 can be performed respectively by the corresponding intrument shown in Fig. 2.
In step 301, determine the neighbor cell of current area.
In the present embodiment, using the community 0A in Fig. 1 as current area, what therefore determine in step 301 is the neighbor cell of community 0A.Can determine from Fig. 1, the neighbor cell of community 0A is community 0B, 0C, 6B, 1C, 1B, 2C.
In step 302, receive the information relevant to the edge band of neighbor cell.
The information relevant to the edge band of neighbor cell such as can comprise: the identifier of neighbor cell, the position of the macro base station of neighbor cell, the power level of the frequency range of the edge band of neighbor cell or frequency range (such as comprise initial frequency, terminate frequency, frequency bandwidth etc.) and correspondence, etc.
In the present invention, the information relevant to the edge band of neighbor cell can in the memory in the frequency reuse equipment shown in storage figure 2, and any one that also can store in a network can in the storage device of frequency reuse device access as shown in Figure 2 or any other equipment.
In this step, what frequency reuse equipment of the present invention received is the information relevant to the edge band of neighbor cell 0B, 0C, 6B, 1C, 1B, 2C.
In step 303, based on received information, micro-base station of current area is made to reuse the edge band of described neighbor cell.
Flow process shown in Fig. 5 and Fig. 6 gives the two kinds of embodiments realizing step 303, below will specifically describe.
Then, the flow process of Fig. 3 terminates.
Fig. 4 is the block diagram of the frequency reuse equipment 400 for heterogeneous network according to another embodiment of the invention.Equipment 400 can comprise: determining unit 410, for determining the neighbor cell of current area; Receiving element 420, for receiving the information relevant to the edge band of neighbor cell; Reuse unit 430, the information for receiving based on described receiving element makes micro-base station of current area reuse the edge band of described neighbor cell.This is reused unit 430 and may further include: determining device 431 and reuse device 432.
In one embodiment, determining device 431 for determining the summation of the edge band of each neighbor cell, the summation of reuse device 432 for making each micro-base station of current area reuse described edge band.Fig. 5 shows the method flow diagram corresponding with this embodiment.
In another embodiment, determining device 431 disturbs maximum neighbor cell for determining to each micro-base station of current area; The edge band of reuse device 432 for making described each micro-base station reuse the neighbor cell except disturbing maximum neighbor cell.Fig. 6 shows the method flow diagram corresponding with this embodiment.
In a kind of specific implementation provided as an example, determining device 431 may further include: for obtaining the device in the sector antenna beam direction of the macro base station of neighbor cell; For the device of the angle between the line direction of the macro base station of a micro-base station and described neighbor cell of determining current area and the sector antenna beam direction obtained; For the device sorted to each angle determined; For the neighbor cell corresponding with minimum angle being defined as the device described micro-base station being disturbed to maximum neighbor cell.Fig. 7 shows the method flow diagram corresponding with this implementation.
In the another kind of specific implementation provided as an example, determining device 431 may further include: the device of the power of the signal that a micro-base station for obtaining current area receives from the macro base station of neighbor cell; For the device that basis sorts to the power of obtained signal; For the neighbor cell corresponding with the signal of maximum power being defined as the device described micro-base station being disturbed to maximum neighbor cell.Fig. 8 shows the method flow diagram corresponding with this implementation.
Fig. 5 is the flow chart of the frequency reuse approach for heterogeneous network according to another embodiment of the invention.
In step 501, determine the neighbor cell of current area.
This step and abovementioned steps 301 similar, in the present embodiment same using the community 0A in Fig. 1 as current area, then can determine that the neighbor cell of current area 0A is community 0B, 0C, 6B, 1C, 1B, 2C.
In step 502, receive the information relevant to the edge band of neighbor cell.
Similar with abovementioned steps 302, what frequency reuse equipment received equally in the present embodiment is the information relevant to the edge band of neighbor cell 0B, 0C, 6B, 1C, 1B, 2C.Such as, the identifier of neighbor cell is CELL
0B, CELL
0c, CELL
6B, CELL
1c, CELL
1B, CELL
2C; The position of macro base station eNB1, eNB2, eNB6 of neighbor cell; As shown in Figure 9 A, the frequency range of the edge band of neighbor cell 0B, 6B, 1B is F2 and the power level of correspondence is α, and the frequency range of the edge band of neighbor cell 0C, 1C, 2C is F3 and the power level of correspondence is also α.It should be noted, the edge band that the present invention does not limit neighbor cell needs to have identical power level, as long as the transmitting power of the edge band of each community is higher than the transmitting power of center frequency-band.
When the overall transmission power of a community is set as predetermined value, suppose that the bandwidth of frequency band F1, F2 and F3 is equal, the through-put power of average each PRB is for being normalized to 1, through-put power for average each PRB of utilizing cell edge frequency band is α, and the through-put power so for average each PRB of center of housing estate frequency band is (3-α)/2.
In step 503, determine the summation of the edge band of each neighbor cell.
Known according to step 502, the frequency range of the edge band of neighbor cell 0B, 6B, 1B is F2, the frequency range of the edge band of neighbor cell 0C, 1C, 2C is F3, the frequency range that the summation that therefore can obtain the edge band of neighbor cell 0B, 0C, 6B, 1C, 1B, 2C is made up of F2 and F3.
In step 504, each micro-base station of current area is made to reuse the summation of described edge band.
Then, the flow process of Fig. 5 terminates.
Fig. 9 B shows the frequency reuse result of method according to Fig. 5, and wherein LPN1/2 represents micro-base station LPN1 and LPN2 of current area 0A.As shown in Figure 9 B, LPN1 and LPN2 reuses the edge band summation of neighbor cell 0B, 0C, 6B, 1C, 1B, the 2C obtained from step 503, namely reuses these two frequency ranges of F2 and F3, is respectively its subscriber equipment service.
In addition, when community 0B is as current area, micro-base station LPN1 and LPN2 in the 0B of community reuses these two frequency ranges of F1 and F3, is respectively its subscriber equipment service.
When community 0C is as current area, micro-base station LPN1 and LPN2 in the 0B of community reuses these two frequency ranges of F1 and F2, is respectively its subscriber equipment service.
In the embodiment shown in fig. 5, the frequency range F2 used due to micro-base station LPN1 and LPN2 and F3 is orthogonal with the edge band F1 of community 0A, therefore, it is possible to effectively avoid micro-base station LPN1 and LPN2 subscriber equipment separately of community 0A and the interference from the edge band of this community (that is, community 0A).In addition, because described cell base station reduces transmitting power at its frequency range F2 and F3, therefore, it is possible to effectively reduce micro-base station LPN1 and LPN2 subscriber equipment separately and the interference from the center frequency-band of this community (that is, community 0A).
In addition, it should be noted, although the marginal frequency scope of neighbor cell is reused in micro-base station, the through-put power of micro-base station can not change, because the through-put power of itself is well below the through-put power of the macro base station of neighbor cell.
Fig. 6 is the flow chart of the frequency reuse approach for heterogeneous network according to another embodiment of the invention.
In step 601, determine the neighbor cell of current area.
This step and abovementioned steps 301 and step 501 similar, in the present embodiment same using the community 0A in Fig. 1 as current area, then can determine that the neighbor cell of current area 0A is community 0B, 0C, 6B, 1C, 1B, 2C.
In step 602, receive the information relevant to the edge band of neighbor cell.
Similar with step 502, what frequency reuse equipment received equally in the present embodiment is the information relevant to the edge band of neighbor cell 0B, 0C, 6B, 1C, 1B, 2C.Such as, the identifier of neighbor cell is CELL
0B, CELL
0C, CELL
6B, CELL
1c, CELL
1B, CELL
2C; The position of macro base station eNB1, eNB2, eNB6 of neighbor cell; As shown in Figure 9 A, the frequency range of the edge band of neighbor cell 0B, 6B, 1B is F2 and the power level of correspondence is α, and the frequency range of the edge band of neighbor cell 0C, 1C, 2C is F3 and the power level of correspondence is also α.It should be noted, the edge band that the present invention does not limit neighbor cell needs to have identical power level, as long as the transmitting power of the edge band of each community is higher than the transmitting power of center frequency-band.
In step 603, determine to disturb maximum neighbor cell to each micro-base station of current area.
Fig. 7 and Fig. 8 gives two kinds of exemplary specific implementations for realizing step 603.
Fig. 7 is the flow chart that the method for maximum neighbor cell is disturbed in a micro-base station for determining current area according to an embodiment of the invention.
In step 701, obtain the sector antenna beam direction of the macro base station of neighbor cell.
The sector antenna beam direction of the macro base station of each community can be stored in whole network system in a functional stronger macro base station, also can be stored in the macro base station of each community, therefore frequency reuse equipment of the present invention can obtain the sector antenna beam direction of this macro base station from the macro base station of the stronger macro base station of above-mentioned functions or each community.
In addition, frequency reuse equipment of the present invention can also by sending query messages to this macro base station and obtaining the sector antenna beam direction of this macro base station according to response message in real time.
The sector antenna beam direction of the macro base station of neighbor cell such as can be expressed as the angle of antenna beam direction and horizontal plane.
In step 702, determine the angle between the line direction of a micro-base station of current area and the macro base station of described neighbor cell and the sector antenna beam direction obtained.
According to the information relevant to the edge band of neighbor cell received in step 502, the position of macro base station eNB1, eNB2, eNB6 of neighbor cell can be known.
First the position of micro-base station LPN1 of current area 0A is determined in a step 702, then can according to the position of LPN1 and macro base station eNB1, eNB2, the position of eNB6 obtains three lines, macro base station eNB1 is chosen in the sector antenna beam direction of the macro base station of the neighbor cell that can obtain from step 701 subsequently, eNB2, the sector antenna beam direction of eNB6, can utilize afterwards and be associated with macro base station eNB1, eNB2, three line directions of eNB6 and be associated with macro base station eNB1, eNB2, 9 sector antenna beam directions of eNB6 are (because a macro base station has 3 antennas, therefore eNB1, eNB2, these three macro base stations of eNB6 have 9 sector antenna beam directions) calculate 9 angles.Such as, can calculate 3 angles between the line direction of the LPN1 of macro base station eNB1 and community 0A and three antenna beam direction of macro base station eNB1, the rest may be inferred, for LPN1,3 angles can be calculated equally respectively about macro base station eNB2 and eNB6, thus obtain 9 angles.
In like manner, other three lines can be obtained according to the position of the position of LPN2 and macro base station eNB1, eNB2, eNB6, then utilize 9 sector antenna beam telegoniometers of these three lines and macro base station eNB1, eNB2, eNB6 to calculate 9 angles.
In step 703, each angle determined is sorted.
Micro-base station LPN1 for current area 0A performs sorting operation separately, also namely sorts for 9 angles relevant to this LPN1 calculated.
In addition, the micro-base station LPN2 for current area 0A performs sorting operation equally separately, also namely sorts for 9 angles relevant to this LPN2 calculated.
In step 704, the neighbor cell corresponding with minimum angle is defined as disturb maximum neighbor cell to described micro-base station.
In the present embodiment, suppose that for the minimum angle of micro-base station LPN1 of current area 0A be the sector antenna beam direction of macro base station eNB6 in the 6B of community, therefore in step 704, neighbor cell 6B is defined as disturbing maximum neighbor cell to micro-base station LPN1.
Suppose that for the minimum angle of micro-base station LPN2 of current area 0A be the sector antenna beam direction of macro base station eNB2 in the 2C of community, therefore neighbor cell 2C is defined as disturbing maximum neighbor cell to micro-base station LPN2.
Then, the flow process of Fig. 7 terminates.
Fig. 8 is the flow chart disturbing the method for maximum neighbor cell for the micro-base station determining current area according to another embodiment of the invention.
In step 801, the power of the signal that the micro-base station obtaining current area receives from the macro base station of neighbor cell.
Such as, the power of the signal received respectively from neighbor cell 0B, 0C, 6B, 1C, 1B, 2C by the micro-base station LPN1 measuring current area 0A, can obtain 6 signal power values.The power of the signal received respectively from neighbor cell 0B, 0C, 6B, 1C, 1B, 2C by the micro-base station LPN2 measuring current area 0A, also can obtain 6 signal power values.
In step 802, sort according to the power of obtained signal.
In this step, respectively sorting operation is performed to relevant to LPN1 6 signal power values and 6 the signal power values relevant with LPN2.
In step 803, the neighbor cell corresponding with the signal of maximum power is defined as disturb maximum neighbor cell to described micro-base station.
Suppose that signal power maximum that micro-base station LPN1 of current area 0A receives is the signal from macro base station eNB6, the signal power maximum that micro-base station LPN2 of current area 0A receives is the signal from macro base station eNB2, be then defined as disturbing maximum neighbor cell to micro-base station LPN1 by neighbor cell 6B in step 803 and be defined as by neighbor cell 2C disturbing maximum neighbor cell to micro-base station LPN2.
Then, the flow process of Fig. 8 terminates.
In step 604, described each micro-base station is made to reuse the edge band of the neighbor cell except disturbing maximum neighbor cell.
For micro-base station LPN1 of current area 0A, because the neighbor cell that the interference determined in the example of step 603 is maximum is 6B, and the edge band of community 6B corresponds to F2, the edge band of the neighbor cell that what therefore this LPN1 reused is outside frequency range F2.Again because the edge band of the neighbor cell of current area 0A is F2 or F3, so this LPN1 reuses is frequency range F3 except F2.
For micro-base station LPN2 of current area 0A, because the neighbor cell that the interference determined in the example of step 603 is maximum is 2C, and the edge band of community 2C corresponds to F3, the edge band of the neighbor cell that what therefore this LPN2 reused is outside frequency range F3.Again because the edge band of the neighbor cell of current area 0A is F2 or F3, so this LPN2 reuses is frequency range F2 except F3.
Then, the flow process of Fig. 6 terminates.
Fig. 9 C shows the frequency reuse result of method according to Fig. 6.As shown in Figure 9 C, micro-base station LPN1 of current area 0A reuses frequency range F3 for its subscriber equipment and serves, and micro-base station LPN2 of current area 0A reuses frequency range F2 for its subscriber equipment and serves.
In addition, when community 0B is as current area, the micro-base station LPN1 in the 0B of community reuses frequency range F1 for its subscriber equipment and serves, and micro-base station LPN2 of community 0B reuses frequency range F3 for its subscriber equipment and serves.
When community 0C is as current area, the micro-base station LPN1 in the 0C of community reuses frequency range F2 for its subscriber equipment and serves, and micro-base station LPN2 of community 0C reuses frequency range F1 for its subscriber equipment and serves.
Utilize this frequency reuse approach, except the interference of the subscriber equipment and this minizone of alleviating micro-base station, the dominant interference from neighbor cell can also be removed.
For above radio resource management scenarios, Cell Edge User equipment dominant interference is from the center frequency-band of neighbor cell.Because the transmitting power of the neighbor cell base station and micro-base station that take center frequency-band is much lower relative to the transmitting power of described utilizing cell edge frequency band, therefore described Cell Edge User equipment receptivity can be greatly improved.On the other hand, for the micro-base station being deployed in edge, the dominant interference of its subscriber equipment comes from center frequency-band and the neighbor cell edge band of this community.The transmitting power reduced at center frequency-band due to the base station of described community and described community adjacent base station comparatively far away apart from the subscriber equipment of micro-base station of described community, so the subscriber equipment of micro-base station is interfered less.Especially, when micro-base station adopts Fig. 9 C to show method of spectral reuse, the subscriber equipment of micro-base station will reduce further from the presence of intercell interference of neighbor cell.For the central user equipment of macro base station service, because its distance service base station is comparatively near, described frequency reuse scheme is less to its performance impact.
Figure 10 and Figure 11 respectively illustrates comparing the simulation result of frequency reuse approach according to the present invention and prior art.In Fig. 10, micro-base station is such as pico node, and it is directly connected to core net.The subscriber equipment of pico node by with this pico node direct communication thus with core net exchange message, and Figure 10 is to the method shown in Fig. 5 of the present invention compared with the prior art.In fig. 11, micro-base station is such as via node (In-band relay nodes) in band, the subscriber equipment of micro-base station communicates with macro base station via the micro-base station as repeater, and Figure 11 is to the method shown in Fig. 6 of the present invention compared with the prior art.
First, following table 1 shows the system parameters that the emulation of carrying out Figure 10 and Figure 11 uses:
Table 1 system integration project parameter
Figure 10 shows comparing the simulation result of method according to Fig. 5 and prior art.
In multi-user system, can by considering that the fairness between user carrys out the effect of comparison techniques scheme.The cumulative distribution function of normalized user throughput (CDF, Cumulative Distribution Function) curve such as can be utilized to represent this effect.Throughput generally represents by the data volume of transmission correct in the unit interval, and the throughput of all users is done normalization relative to system bandwidth.
Two curves shown in Figure 10 are the normalized user throughput of method of the present invention and prior art respectively.Table 2 shows corresponding system emulation result, represents average and customer edge (5%) throughput of corresponding user and its gain.Can find out, compared with not having the performance of frequency reuse heterogeneous system, community of the present invention average throughput is 2.06, is greater than 1.93 of prior art; Cell edge throughput of the present invention is 0.0142, is greater than 0.0126 of prior art equally.Therefore, method of the present invention significantly improves community average throughput and cell edge throughput.
Table 2 system emulation result
Figure 11 shows comparing the simulation result of method according to Fig. 6 and prior art.
Two curves shown in Figure 11 are the normalized user throughput of method of the present invention and prior art respectively.Table 3 shows corresponding system emulation result, represents average and customer edge (5%) user throughput of corresponding user and its gain.Can find out and do not have compared with frequency reuse conventional cellular systems performance, to utilize frequency reuse approach of the present invention can improve cell-edge performance and whole system performance simultaneously.
Table 3 system emulation result
It is pointed out that disclosed method of the present invention can realize in the combination of software, hardware or software and hardware.Hardware components can utilize special logic to realize; Software section can store in memory, and by suitable instruction execution system, such as microprocessor, personal computer (PC) or large-scale computer perform.
The object of specification of the present invention is provided to be to illustrate and describing, instead of for exhaustive or limit the invention to disclosed form.For those of ordinary skill in the art, many modifications and changes are all apparent.
Therefore; selecting and describing execution mode is to explain principle of the present invention and practical application thereof better; and those of ordinary skill in the art are understood, under the prerequisite not departing from essence of the present invention, all modifications and change all fall within protection scope of the present invention defined by the claims.
Claims (19)
1., for a frequency reuse approach for heterogeneous network, described method comprises step:
Determine the neighbor cell of current area;
Receive the information relevant to the edge band of neighbor cell;
Based on received information, micro-base station of current area is made to reuse the edge band of described neighbor cell.
2. method according to claim 1, the step wherein making micro-base station of current area reuse the edge band of described neighbor cell comprises:
Determine the summation of the edge band of each neighbor cell; And
Each micro-base station of current area is made to reuse the summation of described edge band.
3. method according to claim 1, the step wherein making micro-base station of current area reuse the edge band of described neighbor cell comprises:
Determine to disturb maximum neighbor cell to each micro-base station of current area;
Each micro-base station described is made to reuse the edge band of the neighbor cell except disturbing maximum neighbor cell.
4. method according to claim 3, wherein determine to disturb the step of maximum neighbor cell to comprise to each micro-base station of current area:
Obtain the sector antenna beam direction of the macro base station of neighbor cell;
Determine the angle between the line direction of a micro-base station of current area and the macro base station of described neighbor cell and the sector antenna beam direction obtained;
Each angle determined is sorted;
The neighbor cell corresponding with minimum angle is defined as disturb maximum neighbor cell to described micro-base station.
5. method according to claim 3, wherein determine to disturb the step of maximum neighbor cell to comprise to each micro-base station of current area:
The power of the signal that the micro-base station obtaining current area receives from the macro base station of neighbor cell;
Sort according to the power of obtained signal;
The neighbor cell corresponding with the signal of maximum power is defined as disturb maximum neighbor cell to described micro-base station.
6. method according to claim 1, the reference signal power size that the subscriber equipment of wherein directly serving according to macro base station receives from described macro base station is described user equipment allocation resource.
7. method according to claim 6, wherein said macro base station is the user equipment allocation edge band that the reference signal power received is less than predetermined power threshold, for the reference signal power received is more than or equal to the user equipment allocation center frequency-band of predetermined power threshold.
8. method according to claim 6, wherein corresponding with the edge band of community power is higher than the power corresponding with the center frequency-band of described community.
9. method according to claim 1, wherein the frequency of the frequency of the edge band of current area and the edge band of neighbor cell is mutually orthogonal.
10., for a frequency reuse equipment for heterogeneous network, described equipment comprises:
Determining unit, for determining the neighbor cell of current area;
Receiving element, for receiving the information relevant to the edge band of neighbor cell;
Reuse unit, the information for receiving based on described receiving element makes micro-base station of current area reuse the edge band of described neighbor cell.
11. equipment according to claim 10, wherein said unit of reusing comprises:
Determining device, for determining the summation of the edge band of each neighbor cell; And
Reuse device, for the summation making each micro-base station of current area reuse described edge band.
12. equipment according to claim 10, wherein said unit of reusing comprises:
Determining device, disturbs maximum neighbor cell for determining to each micro-base station of current area;
Reuse device, reuses the edge band of the neighbor cell except disturbing maximum neighbor cell for making each micro-base station described.
13. equipment according to claim 12, wherein said determining device comprises:
For obtaining the device in the sector antenna beam direction of the macro base station of neighbor cell;
For the device of the angle between the line direction of the macro base station of a micro-base station and described neighbor cell of determining current area and the sector antenna beam direction obtained;
For the device sorted to each angle determined;
For the neighbor cell corresponding with minimum angle being defined as the device described micro-base station being disturbed to maximum neighbor cell.
14. equipment according to claim 12, wherein said determining device comprises:
The device of the power of the signal received from the macro base station of neighbor cell for the micro-base station obtaining current area;
For the device that basis sorts to the power of obtained signal;
For the neighbor cell corresponding with the signal of maximum power being defined as the device described micro-base station being disturbed to maximum neighbor cell.
15. equipment according to claim 10, wherein in described heterogeneous network, the reference signal power size that the subscriber equipment of directly serving according to macro base station receives from described macro base station is described user equipment allocation resource.
16. equipment according to claim 15, wherein said macro base station is the user equipment allocation edge band that the reference signal power received is less than predetermined power threshold, for the reference signal power received is more than or equal to the user equipment allocation center frequency-band of predetermined power threshold.
17. equipment according to claim 15, wherein corresponding with the edge band of community power is higher than the power corresponding with the center frequency-band of described community.
18. equipment according to claim 10, wherein in described heterogeneous network, the frequency of the frequency of the edge band of current area and the edge band of neighbor cell is mutually orthogonal.
19. 1 kinds of nodes, comprising: the equipment according to any one of claim 10-18.
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| PCT/CN2010/071608 WO2011124026A1 (en) | 2010-04-07 | 2010-04-07 | Frequency reuse method and device |
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| WO2007084681A1 (en) * | 2006-01-20 | 2007-07-26 | Atc Technologies, Llc | Systems and methods for satellite forward link transmit diversity using orthogonal space coding |
| CN101420746A (en) * | 2007-10-26 | 2009-04-29 | 中兴通讯股份有限公司 | Method for interference coordination between cells and interference coordination information transmission method therefor |
| CN101600210A (en) * | 2008-12-30 | 2009-12-09 | 上海无线通信研究中心 | Frequency reuse and allocation method based on the mobile communication system network of different bandwidth |
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| CN101827370A (en) * | 2009-03-05 | 2010-09-08 | 中国移动通信集团公司 | Frequency reuse control method, system and base station equipment based on OFDM (Orthogonal Frequency Division Multiplexing) |
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| WO2007084681A1 (en) * | 2006-01-20 | 2007-07-26 | Atc Technologies, Llc | Systems and methods for satellite forward link transmit diversity using orthogonal space coding |
| CN101420746A (en) * | 2007-10-26 | 2009-04-29 | 中兴通讯股份有限公司 | Method for interference coordination between cells and interference coordination information transmission method therefor |
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