CN101511107A - Frequency planning method based on synergic multi-point single-user multi-input multi-output - Google Patents

Frequency planning method based on synergic multi-point single-user multi-input multi-output Download PDF

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CN101511107A
CN101511107A CNA2009100805974A CN200910080597A CN101511107A CN 101511107 A CN101511107 A CN 101511107A CN A2009100805974 A CNA2009100805974 A CN A2009100805974A CN 200910080597 A CN200910080597 A CN 200910080597A CN 101511107 A CN101511107 A CN 101511107A
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贺志强
徐兴坤
牛凯
邱涛
田宝玉
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Abstract

The invention provides a frequency layout method based on cooperating with multi-point single user multi-input and multi-output which includes steps as follows: averaging a frequency segment occupied by the subdistrict by using CoMP transmitting into three equal parts: three sectors occupy one third of the subdistrict frequency segment orderly; then dividing each sector frequence band into a CoMPSector Zone frequency band for providing service to CoMP user, and residual frequency band services the non-CoMP user by a method of using a frequency reuse factor; selecting CoMP mode participated by a virtual subdistrict according with a user transmitting ratio requirement, then distributing CoMP sector Zone frequency band size according with the transmitting requirement ratio of CoMP user and non-CoMP user, finally deciding whether adjusting or transfering to CoMP Sector Zone frequency band size or CoMP mode real time according with the measurement and feedback of the user chunnel quality. The method can reduce calculating complex degree and information alternation amount to the network carried by CoMP, ensure frequency spectrum of the whole edge user and the whole system, and increase system chunnel capacity.

Description

A kind of frequency planning method based on collaborative multiple spot list user multiple-input and multiple-output
Technical field
The present invention relates to a kind of problem that how to adopt collaborative multiple spot technology use Internet resources, exactly, relate to a kind of based on CoMP SU-MIMO (Coordinated Multipoint, collaborative multiple spot; Single UserMultiple-input Multiple-output, single user's multiple-input and multiple-output) frequency planning method of technology, the transmitting terminal that is used to solve CoMP SU-MIMO transmission need use identical frequency resource, and this constraint makes can not directly adopt the traditional planning and the problem of dispatching method.Belong to the mobile communication technology field.
Background technology
In 3GPP RAN1#53 meeting, collaborative multicast communication technology has been brought in the standard of LTE-A.Collaborative multicast communication technology brings very big gain can for the central user and the edge customer of sub-district, can satisfy LTE-A in many-sided demands such as message capacity, coverage rate and spectrum efficiencies.
Descending collaborative multipoint transmission mode is divided into two classes: based on the beam shaping transmission means of cooperative scheduling with based on the transmission means of Combined Treatment.In transmission means based on Combined Treatment, simultaneously transmit data by a plurality of transmission points (base station or antenna) to the user, co-channel interference between the adjacent transmission point is converted into useful signal, thereby has improved received signal quality effectively, realize eliminating the purpose of disturbing.The prerequisite of taking this transmission means is that targeted customer's reception data are shared and Combined Treatment between cooperation district.According to CoMP at number of users, the CoMP mode of Combined Treatment can be further divided into single user CoMP (CoMP-SU-MIMO) and multi-user CoMP (CoMP-MU-MIMO).
The present invention relates to a kind of frequency planning method based on CoMP-SU-MIMO.With the present invention similarly be that the frequency planning scheme " Discussionson CoMP SU-MIMO " that Samsung company proposes in 3GPP RAN1#53 meeting (is published in R1-090613,3GPP TSG RAN WG1Meeting#56, February9-13, Samsung, 2009).
Referring to Fig. 1, simply introduce this scheme: under the situation of fixed cells sub-clustering (three sub-district clusters), the frequency planning scheme that Samsung company proposes is to be divided into two parts with three shared frequency ranges of cooperation district in the cluster.Wherein fixedly mark off the frequency range (shown in the shadow region among Fig. 1) of one section identical size, be called collaborative multicast communication frequency field (CoMP Frequency Zone).CoMP Frequency Zone is used to serve the CoMP user of each sub-district, and remaining subdistrict frequency band is served the central user of sub-district separately respectively.
Definite mode of this scheme CoMP user is: by threshold value α is set, the user of the SINR＜α that satisfies condition need carry out CoMP.Which sub-district CoMP user can select work in coordination with according to the gain of all neighbor cells, if the user selects wherein adjacent two sub-districts as cooperation district, so bunch in the remaining sub-district central user that the idle sub-carrier of correspondence can be distributed to this sub-district use.
There is following shortcoming in above-mentioned prior art:
(1) mode of fixed frequency planning realizes easily, but can cause the frequency adjustment of sub-district in a plurality of non-bunch in the process of carrying out CoMP Frequency Zone adjustment, thereby increases the complexity of algorithm.
(2) existing scheme allow CoMP with bunch in the user can select the sub-district as its cooperation district, therefore this scheme need be taked the very high dispatching algorithm of complexity, realizes avoiding the interference of CoMP link between different bunches and the interference of CoMP user and different districts central user.
(3) frequency resource of CoMP bunch of different uses is identical, disturbs excessively between causing bunch, so the Signal to Interference plus Noise Ratio of edge customer can not effectively improve.
(4) interactive information between a plurality of sub-districts between needing bunch based on the resource allocation of existing scheme, the more information amount requires the ability of X2 interface to be improved greatly.
(5) fixed frequency planning mode can not effectively improve spectrum utilization efficiency: the loading condition difference of the central user of each sub-district and edge customer can cause existing scheme can not effectively improve spectrum utilization efficiency in bunch.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of frequency planning method based on collaborative multiple spot list user multiple-input and multiple-output, the present invention can solve the defective that prior art exists, reduce computation complexity and the information interaction amount that CoMP brings network system by effective frequency planning method, and on the basis that computation complexity obviously reduces, guarantee the spectrum efficiency of edge customer and whole system.In addition, using the CoMP user of the inventive method to adopt frequency duplex factor as one is that 3 mode can effectively be avoided the interference between the CoMP link, is the throughput that 1 mode can effectively improve system but not CoMP user adopts frequency factor.
In order to achieve the above object, the invention provides a kind of frequency planning method based on collaborative multiple spot list user multiple-input and multiple-output, it is characterized in that: will adopt the shared frequency range in sub-district of CoMP transmission to be divided into three equal parts earlier: three sectors in this sub-district take 1/3 of this sub-district frequency range successively respectively, frequency range to each sector marks off the CoMP Sector Zone frequency range that service is provided for CoMP user, and promptly frequency duplex factor as one is 3; After finishing CoMP Sector Zone frequency range planning, it is that 1 mode is served non-CoMP user that the residue frequency range of each sub-district adopts frequency duplex factor as one, and promptly the non-CoMP user of each sector can both use these remaining frequency ranges; At each frequency planning in the cycle, the CoMP pattern of selecting virtual subdistrict to participate in according to user's transmission rate request is two collaborative sectors or three collaborative sectors earlier, the size of distributing CoMP sector Zone frequency range again according to CoMP user and non-CoMP user's transmission rate request ratio, by the measurement and the feedback of user channel quality, whether decision-making in real time will be adjusted respectively or change the size or the CoMP pattern of CoMP Sector Zone frequency range at last.
The present invention is a kind of frequency planning method of the SU-MIMO technology based on static CoMP pattern, be characterized in: by effective frequency planning, employing is that benchmark is carried out real-time dynamic decision adjustment and conversion to the planning of CoMP pattern and CoMP SectorZone frequency range with the sector, to reduce computation complexity and the information interaction amount that CoMP brings network system, and, guarantee the spectrum efficiency of edge customer and whole system obviously reducing on the basis of computation complexity.This method according to the increase or the minimizing of number of users in certain virtual subdistrict, is further adjusted the size of the CoMP Sector Zone frequency range of each sector in the cooperation district under the prerequisite of determining virtual subdistrict CoMP pattern.This technical scheme can not exert an influence to the CoMP Sector Zone frequency range size of other two sectors in this cellular cell, thereby reduces the computation complexity of this type of adjustment algorithm of knowing clearly.Using the CoMP user of the inventive method to adopt frequency duplex factor as one is that 3 mode can effectively be avoided the interference between the CoMP link, is that 1 mode can effectively improve the system channel capacity but not CoMP user adopts frequency factor.In addition, the present invention then is to distribute overlapping frequency resource according to " painted " theory for non-conterminous virtual subdistrict, makes that the employed frequency resource in different virtual sub-district can be overlapped, thereby can effectively improve the spectrum utilization efficiency of sub-district.
Description of drawings
Fig. 1 is the frequency band division mode schematic diagram of Samsung motion under CoMP SU-MIMO scene.
Fig. 2 is the cellular cell among the present invention and the connotation schematic diagram of virtual subdistrict.
Fig. 3 is the operating process block diagram that the present invention is based on the frequency planning method of CoMP SU-MIMO.
Fig. 4 is the flow diagram that virtual subdistrict is selected the CoMP pattern in the inventive method step (1).
Fig. 5 is the embodiment of the invention: the CoMP Sectors frequency range of 19 sub-districts is divided schematic diagram.
Fig. 6 is the frequency planning schematic diagram of the CoMP sub-district among Fig. 5 embodiment.
Fig. 7 and Fig. 8 are respectively the test data comparison diagrams of emulation embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 2, the connotation of two sub-districts among explanation the present invention earlier: sub-district (Cell) and virtual subdistrict.Sub-district among the figure shown in the hexagon is a traditional cellular cell in the mobile communication system, and each sub-district is respectively equipped with a base station, is responsible for the information interaction and the control of this community mobile communication.Virtual subdistrict is meant and keeping under the conventional cell structure, and the adjacent sectors between three sub-districts constitutes virtual sub-district (for example zone of " vertical line " among the figure, " oblique line " zone and " point-like " zone).User's set of virtual subdistrict is exactly the set that CoMP user forms in the virtual subdistrict.
The present invention is a kind of frequency planning method based on CoMP SU-MIMO technology, this method will adopt the shared frequency range in sub-district of CoMP transmission to be divided into three equal parts earlier: three sectors in this sub-district take 1/3 of this sub-district frequency range successively respectively, frequency range to each sector marks off the CoMP Sector Zone frequency range that service is provided for CoMP user, and promptly frequency duplex factor as one is 3; After finishing CoMP Sector Zone frequency range planning, it is that 1 mode is served non-CoMP user that the residue frequency range of each sub-district adopts frequency duplex factor as one, and promptly the non-CoMP user of each sector can both use these remaining frequency ranges; At each frequency planning in the cycle, the CoMP pattern of selecting virtual subdistrict to participate in according to user's transmission rate request is two collaborative sectors or three collaborative sectors earlier, the size of distributing CoMPsector Zone frequency range again according to CoMP user and non-CoMP user's transmission rate request ratio, by the measurement and the feedback of user channel quality, whether decision-making in real time will be adjusted respectively or change the size or the CoMP pattern of CoMP Sector Zone frequency range at last.
Referring to Fig. 3, introduce following five operating procedures that the inventive method comprises in the cycle at each frequency planning:
Step 1, each virtual subdistrict are selected CoMP pattern separately respectively: the CoMP that the adjacent sectors of two sub-districts participates in, the i.e. CoMP that 2-sector CoMP pattern, or the adjacent sectors of three sub-districts all participates in, i.e. 3-sector CoMP pattern.
In this step, the virtual subdistrict of the employing CoMP transmission that three three adjacent in twos sectors a, b, c of sub-district are constituted selects the operation of CoMP pattern to comprise following content (referring to Fig. 4):
(11) earlier by three cell base station information interactions, obtain three sector a, b and c are arranged in each user of this virtual subdistrict respectively to the geographical position gain, calculate the mean value of user's gain in following each sector and the mean value that gains for user in two other sector respectively in each sector again:
Figure A200910080597D0011161614QIETU
With Be respectively the mean value that the first sector a, the second sector b and the 3rd sector c gain for user in this sector respectively separately;
Figure A200910080597D0011161644QIETU
Be respectively the mean value of the first sector a to user's gain in the second sector b and the 3rd sector c,
Be respectively the mean value of the second sector b to user's gain in the first sector a and the 3rd sector c,
Figure A200910080597D0011161709QIETU
Be respectively the mean value of the 3rd sector c to user's gain in the first sector a and the second sector b.
(12) mean value and the decision threshold γ that utilizes the user to gain adjudicates the first sector a and whether the second sector b becomes collaborative sector, and its prerequisite is whether following four conditions can satisfy simultaneously:
The first sector a to this sector user's gain average and the 3rd sector c to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ca ‾ ≥ γ ;
The second sector b to this sector user's gain average and the 3rd sector c to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H bb ‾ H cb ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the first sector a to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H ac ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the second sector b to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H bc ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the 3rd sector c to user among the first sector a and the second sector b is described, and first sector a and the second sector b all smaller to the interference of user among the 3rd sector c, like this, the 3rd sector c is CoMP participating not, thereby the first sector a and the second sector b that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(13) adopt the method identical to judge whether the second sector b and the 3rd sector c become collaborative sector, promptly adjudicate following four conditions and whether can satisfy simultaneously with step (12):
The second sector b to this sector user's gain average and the first sector a to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H aa ‾ H ca ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the first sector a to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H ac ‾ ≥ γ ;
The first sector a to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ba ‾ ≥ γ ;
The first sector a to this sector user's gain average and the 3rd sector c to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ca ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the first sector a to user among the second sector b and the 3rd sector c is described, and second sector b and the 3rd sector c all smaller to the interference of user among the first sector a, like this, the first sector a is CoMP participating not, and then the second sector b and the 3rd sub-district c that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(14) adopt the method identical to judge whether the 3rd sector c and the second sector b become collaborative sector, promptly adjudicate following four conditions and whether can satisfy simultaneously with abovementioned steps:
The first sector a to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ba ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the second sector b to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H bc ‾ ≥ γ ;
The second sector b to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H bb ‾ H ab ‾ ≥ γ ;
The second sector b to this sector user's gain average and the 3rd sector c to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H bb ‾ H cb ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the second sector b to user among the first sector a and the 3rd sector c is described, and first sector a and the 3rd sector c all smaller to the interference of user among the second sector b, like this, the second sector b is CoMP participating not, and then the first sector a and the 3rd sector c that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(15) adjudicating this virtual subdistrict is 3-sector CoMP.
Step 2, determine sub-district CoMP pattern after, according to different business demands, add up the targeted rate requirement of all users in each sub-district successively respectively.
Step 3, each sub-district are respectively CoMP user and divide CoMP Sector Zone frequency range: according to user's transmission rate request of CoMP participating in the described virtual subdistrict, and the transmission rate request of the non-CoMP user among three sector a, b and the c, proportionally divide the size of CoMP Sector Zone frequency range, and the frequency range starting point of being divided is positioned at the low frequency end of corresponding sector frequency band on frequency domain.
The operation of wherein proportionally dividing CoMP Sector Zone frequency range size comprises following two alternative content of operation:
(31) if two sector a in this virtual subdistrict and b adopt 2-sector CoMP pattern, the then ratio beta of the shared first sector a of CoMP Sector Zone frequency range and the second sector b frequency range in this virtual subdistrict AFor: β A = Σ k = 1 K A R k A Σ k = 1 K a R k a + Σ k = 1 K b R k b + Σ k = 1 K A R k A ; In the formula, natural number k is the user's sequence number in this virtual subdistrict, K ABe the number of the CoMP user in this virtual subdistrict, K aAnd K bBe respectively the number of non-CoMP user among the first sector a and the second sector b,
Figure A200910080597D00135
Be the targeted rate of CoMP user k in this virtual subdistrict, With Be respectively the targeted rate of non-CoMP user k among the first sector a and the second sector b,
Figure A200910080597D00141
Be the targeted rate sum of user in this virtual subdistrict,
Figure A200910080597D00142
With
Figure A200910080597D00143
It is respectively the targeted rate sum of user among the first sector a and the second sector b;
(32) if when three sector a, b in this virtual subdistrict and c adopt 3-sector CoMP pattern, the ratio beta of shared three sector a, b of CoMP Sector Zone frequency range and c frequency range in this virtual subdistrict AFor: β A = Σ k = 1 K A R k A Σ k = 1 K a R k a + Σ k = 1 K b R k b + Σ k = 1 K c R k c + Σ k = 1 K A R k A ; In the formula, K cBe the targeted rate of non-CoMP user among the 3rd sector c,
Figure A200910080597D00145
Be the targeted rate of non-CoMP user k among the 3rd sector c, It is the targeted rate sum of non-CoMP user among the 3rd sector c.
Step 4, information interaction is carried out in each sub-district, so that dynamically adjust the size of CoMP Sector Zone frequency range: at each frequency planning in the cycle, the situation of change of CoMP user and other user rates is known in each sub-district by information interaction, dynamically adjust the size of the CoMP Sector Zone frequency range of each sector: in case the non-CoMP user rate in certain sector requires to change, make that wherein the ratio of the shared relevant sectors frequency range of CoMP Sector Zone frequency range can not satisfy when imposing a condition, just return the operation of execution in step 3, to adjust the shared CoMP Sector Zone frequency range of this virtual subdistrict coMP user.
Information interaction is carried out in step 5, each sub-district, carries out the CoMP mode switch; Cell base station is received the user profile of each cooperation district and the user profile of non-collaborative neighbor cell by X2 interface, according to the variation of cell channel situation, adjudicates the CoMP pattern that whether needs to adjust virtual subdistrict; If the virtual subdistrict of 2-sector CoMP pattern can not satisfy the pairing judgment condition of step 2, then return execution in step 2 earlier, then the operation of execution in step 3; If the virtual subdistrict of 3-sector CoMP pattern can satisfy any one the 2-sector CoMP pattern in the step 2, then switch to corresponding 2-sector CoMP pattern, return execution in step 2 earlier, then the operation of execution in step 3.
After any one virtual subdistrict under each sub-district in this system was all carried out the CoMP mode switch, the cycle of promptly finishing a frequency planning.
Below come the operating procedure of brief description the inventive method referring to the example of Fig. 5 and Fig. 6:
According to each sector user's of a certain moment gain situation, select the CoMP pattern earlier, Fig. 5 is each cell coordination pattern diagram in a frequency spectrum a certain moment point in planning horizon.According to the different pattern between the sub-district among the figure, can observe out the collaborative pattern (2-sector or 3-sector) that adopt each sub-district.Xie Tong three sub-districts wherein: 3-sectorCoMP (being sector number in the bracket of lower right side figure among the figure) is adopted in the sector 1 of the sector 3 of sub-district 1, the sector 2 of sub-district 3 and sub-district 5, the frequency range of dividing as shown in Figure 6, the common frequency band CoMP Sector Zone of above-mentioned three adjacent sectors is " right oblique line " frequency range, and its frequency points corresponding is identical and frequency range is big or small identical.2-sectorCoMP is adopted with 1 of the sector of sub-district 7 in the sector 3 of sub-district 3, has divided corresponding C oMP Sector Zone frequency range equally, i.e. " grid " frequency range among Fig. 6.The sector 1 of the sector 3 of sub-district 5, the sector 2 of sub-district 7 and sub-district 8 is to have adopted 3-sector CoMP collaborative, i.e. its corresponding CoMP Sector Zone frequency range of " multiple spot " representative among Fig. 6.The division of the corresponding band of other each sub-district also is to adopt similar technology to finish, and repeats no more.
As seen in Figure 6: the size of the CoMP Sector Zone frequency range in each virtual subdistrict is different, has reacted the information that each sub-district utilizes the user of feedback to gain, and marks off the corresponding band of serving CoMP user and non-CoMP user respectively in real time.If the targeted rate and the increase of the edge customer in some sectors of CoMP participating technology or reduced, when adjusting its CoMP sector Zone frequency range big or small according to above-mentioned rule of the present invention, as long as adjust the frequency range of the relevant sectors of CoMP participating technology, can not produce related influence to other sub-district.Equally, if virtual subdistrict need carry out the conversion of CoMP pattern, the CoMP sector Zone frequency range of this virtual subdistrict must be again divided according to the proportionate relationship of non-CoMP ownership goal transmission rate sum in this virtual subdistrict user's target transmission speed sum and this virtual subdistrict so.
The present invention has carried out repeatedly simulation experiments, and feasible through proof, than the system that does not carry out CoMP, throughput of system has had bigger lifting, and the spectrum efficiency of edge customer also is improved, and simulation result as shown in Figure 7 and Figure 8.
The simulating scenes that Fig. 7 and Fig. 8 adopt is the model of 7 sub-districts (21 sector), supposes that the transmitting power of base station on each Resource Block equates in the sector.The frequency resource of each sub-district is 50 Resource Block in the simulating scenes, and the size of each Resource Block is 200kHz.Judge that whether the user needs the condition of CoMP is SINR＜α, in the formula, α is predefined threshold value, chooses α=-50 ,-10 ,-1,3dB in the emulation respectively.In addition, the algorithm of scheduling of resource adopts the dispatching algorithm of equitable proportion.
From Fig. 7, the inventive method is compared with not adopting the CoMP system for transmitting as can be seen, aspect the spectrum efficiency of system obvious gain is being arranged.When α chooses different values, corresponding variation can take place in throughput of system, when α=-during 1dB, systematically throughput is relatively big, but optimum α value is to choose according to the application scenarios of reality.
From Fig. 8, the different values of corresponding α as can be seen, the spectrum efficiency of edge customer has obtained effective lifting.Compare with the spectrum efficiency of the system of Fig. 7, adopt the CoMP system for transmitting can satisfy fairness between the user better.Equally, when α=-during 1dB, the better performances of system, but optimum α value also will be decided by the practical application scene.

Claims (7)

1, a kind of frequency planning method based on collaborative multiple spot list user multiple-input and multiple-output, it is characterized in that: will adopt the shared frequency range in sub-district of CoMP transmission to be divided into three equal parts earlier: three sectors in this sub-district take 1/3 of this sub-district frequency range successively respectively, frequency range to each sector marks off the CoMP Sector Zone frequency range that service is provided for CoMP user, and promptly frequency duplex factor as one is 3; After finishing CoMP Sector Zone frequency range planning, it is that 1 mode is served non-CoMP user that the residue frequency range of each sub-district adopts frequency duplex factor as one, and promptly the non-CoMP user of each sector can both use these remaining frequency ranges; At each frequency planning in the cycle, the CoMP pattern of selecting virtual subdistrict to participate in according to user's transmission rate request is two collaborative sectors or three collaborative sectors earlier, the size of distributing CoMP sector Zone frequency range again according to CoMP user and non-CoMP user's transmission rate request ratio, by the measurement and the feedback of user channel quality, whether decision-making in real time will be adjusted respectively or change the size or the CoMP pattern of CoMP Sector Zone frequency range at last.
2, method according to claim 1 is characterized in that: described sub-district is a traditional cellular cell in the mobile communication system, and each sub-district is respectively equipped with one and is responsible for the information interaction of this community mobile communication and the base station of control; Described virtual subdistrict is meant and is keeping under the conventional cell structure that adopt the sub-district of CoMP transmission on the logical concept that adjacent sectors constituted of three sub-districts, user's set of virtual subdistrict then is the set that CoMP user forms in this virtual subdistrict.
3, method according to claim 1 is characterized in that: described method comprises following operating procedure at each frequency planning in the cycle:
(1) each virtual subdistrict is selected CoMP pattern separately respectively: the CoMP that the adjacent sectors of two sub-districts participates in, the i.e. CoMP that 2-sector CoMP pattern, or the adjacent sectors of three sub-districts all participates in, i.e. 3-sector CoMP pattern;
(2) determine sub-district CoMP pattern after, according to different business demands, add up the targeted rate requirement of all users in each sub-district successively respectively;
(3) each sub-district is respectively CoMP user and divides CoMP Sector Zone frequency range: according to user's transmission rate request of CoMP participating in the described virtual subdistrict, and the transmission rate request of the non-CoMP user among three sector a, b and the c, proportionally divide the size of CoMP Sector Zone frequency range, and the frequency range starting point of being divided is positioned at the low frequency end of corresponding sector frequency band on frequency domain;
(4) information interaction is carried out in each sub-district, so that dynamically adjust the size of CoMP Sector Zone frequency range;
(5) information interaction is carried out in each sub-district, carries out the CoMP mode switch; After any one virtual subdistrict under each sub-district in this system was all carried out the CoMP mode switch, the cycle of promptly finishing a frequency planning.
4, method according to claim 3 is characterized in that: in the described step (1), adjacent in twos three sector a, the b in three sub-districts, the virtual subdistrict that c constitutes select the operation of CoMP pattern further to comprise following content:
(11) earlier by three cell base station information interactions, obtain three sector a, b and c are arranged in each user of this virtual subdistrict respectively to the geographical position gain, calculate the mean value of user's gain in following each sector and the mean value that gains for user in two other sector respectively in each sector again:
With
Figure A200910080597C00032
Be respectively the mean value that the first sector a, the second sector b and the 3rd sector c gain for user in this sector respectively separately;
Figure A200910080597C00033
Be respectively the mean value of the first sector a to user's gain in the second sector b and the 3rd sector c,
Be respectively the mean value of the second sector b to user's gain in the first sector a and the 3rd sector c,
Figure A200910080597C00035
Be respectively the mean value of the 3rd sector c to user's gain in the first sector a and the second sector b.
(12) mean value and the decision threshold γ that utilizes the user to gain, whether adjudicate the first sector a and the second sector b becomes the prerequisite of working in coordination with the sector is whether following four conditions can satisfy simultaneously:
The first sector a to this sector user's gain average and the 3rd sector c to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ca ‾ ≥ γ ;
The second sector b to this sector user's gain average and the 3rd sector c to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H bb ‾ H cb ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the first sector a to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H ac ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the second sector b to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H bc ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the 3rd sector c to user among the first sector a and the second sector b is described, and first sector a and the second sector b all smaller to the interference of user among the 3rd sector c, like this, the 3rd sector c is CoMP participating not, thereby the first sector a and the second sector b that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(13) adopt the method identical to judge whether the second sector b and the 3rd sector c become collaborative sector, promptly adjudicate following four conditions and whether can satisfy simultaneously with step (12):
The second sector b to this sector user's gain average and the first sector a to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H bb ‾ H ab ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the first sector a to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H ac ‾ ≥ γ ;
The first sector a to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ba ‾ ≥ γ ;
The first sector a to this sector user's gain average and the 3rd sector c to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ca ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the first sector a to user among the second sector b and the 3rd sector c is described, and second sector b and the 3rd sector c all smaller to the interference of user among the first sector a, like this, the first sector a is CoMP participating not, and then the second sector b and the 3rd sub-district c that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(14) adopt the method identical to judge whether the 3rd sector c and the second sector b become collaborative sector, promptly adjudicate following four conditions and whether can satisfy simultaneously with abovementioned steps:
The first sector a to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H aa ‾ H ba ‾ ≥ γ ;
The 3rd sector c to this sector user's gain average and the second sector b to the ratio of the 3rd sector c user's gain average greater than decision threshold γ, promptly H cc ‾ H bc ‾ ≥ γ ;
The second sector b to this sector user's gain average and the second sector b to the ratio of the first sector a user's gain average greater than decision threshold γ, promptly H bb ‾ H ab ‾ ≥ γ ;
The second sector b to this sector user's gain average and the 3rd sector c to the ratio of the second sector b user's gain average greater than decision threshold γ, promptly H bb ‾ H cb ‾ ≥ γ ;
If above-mentioned four conditions can satisfy simultaneously, the interference of the second sector b to user among the first sector a and the 3rd sector c is described, and first sector a and the 3rd sector c all smaller to the interference of user among the second sector b, like this, the second sector b is CoMP participating not, and then the first sector a and the 3rd sector c that adjudicate in this virtual subdistrict form 2-sector CoMP; Otherwise, carry out subsequent operation;
(15) adjudicating this virtual subdistrict is 3-sector CoMP.
5, method according to claim 3 is characterized in that: in the described step (3), the operation of proportionally dividing CoMP Sector Zone frequency range size further comprises following content:
(31) if two sector a in this virtual subdistrict and b adopt 2-sector CoMP pattern, the then ratio beta of the shared first sector a of CoMP Sector Zone frequency range and the second sector b frequency range in this virtual subdistrict AFor: β A = Σ k = 1 K A R k A Σ k = 1 K a R k a + Σ k = 1 K b R k b + Σ k = 1 K A R k A ; In the formula, natural number k is the user's sequence number in this virtual subdistrict, K ABe the number of the CoMP user in this virtual subdistrict, K aAnd K bBe respectively the number of non-CoMP user among the first sector a and the second sector b,
Figure A200910080597C00055
Be the targeted rate of CoMP user k in this virtual subdistrict, With
Figure A200910080597C00057
Be respectively the targeted rate of non-CoMP user k among the first sector a and the second sector b,
Figure A200910080597C00058
Be the targeted rate sum of user in this virtual subdistrict, With
Figure A200910080597C000510
It is respectively the targeted rate sum of user among the first sector a and the second sector b; Or
(32) if when three sector a, b in this virtual subdistrict and c adopt 3-sector CoMP pattern, the ratio beta of shared three sector a, b of CoMP Sector Zone frequency range and c frequency range in this virtual subdistrict AFor: β A = Σ k = 1 K A R k A Σ k = 1 K a R k a + Σ k = 1 K b R k b + Σ k = 1 K c R k c + Σ k = 1 K A R k A ; In the formula, K cBe the targeted rate of non-CoMP user among the 3rd sector c, Be the targeted rate of non-CoMP user k among the 3rd sector c,
Figure A200910080597C00063
It is the targeted rate sum of non-CoMP user among the 3rd sector c.
6, method according to claim 3, it is characterized in that: described step (4) further comprises following content of operation: at each frequency planning in the cycle, the situation of change of CoMP user and other user rates is known in each sub-district by information interaction, dynamically adjust the size of the CoMP Sector Zone frequency range of each sector: in case the non-CoMP user rate in certain sector requires to change, make that wherein the ratio of the shared relevant sectors frequency range of CoMP SectorZone frequency range can not satisfy when imposing a condition, just return the operation of execution in step (3), to adjust the shared CoMP Sector Zone frequency range of this virtual subdistrict coMP user.
7, method according to claim 3 is characterized in that: described step (5) further comprises following content of operation:
Cell base station is received the user profile of each cooperation district and the user profile of non-collaborative neighbor cell by X2 interface, according to the variation of channel conditions, adjudicates the CoMP pattern that whether needs to adjust virtual subdistrict; If the virtual subdistrict of 2-sector CoMP pattern can not satisfy the pairing judgment condition of step (2), then return execution in step (2) earlier, then the operation of execution in step (3); If the virtual subdistrict of 3-sector CoMP pattern can satisfy any one the 2-sector CoMP pattern in the step (2), then switch to corresponding 2-sector CoMP pattern, return execution in step (2) earlier, then the operation of execution in step (3).
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