CN102487549B - Method and device for scheduling user equipment in MIMO (multiple-input multiple-output) wireless communication system - Google Patents
Method and device for scheduling user equipment in MIMO (multiple-input multiple-output) wireless communication system Download PDFInfo
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- CN102487549B CN102487549B CN201010575034.5A CN201010575034A CN102487549B CN 102487549 B CN102487549 B CN 102487549B CN 201010575034 A CN201010575034 A CN 201010575034A CN 102487549 B CN102487549 B CN 102487549B
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Abstract
The invention relates to a method and a device for scheduling user equipment, wherein the method comprises the following steps: enabling a scheduling device to firstly get channel information of the multiple user equipment, and then selecting K paired user equipment in a two-and-two paring way according to the got channel information of the multiple user equipment so as to enable total system capacity and mutual orthogonality of the K paired user equipment to meet preset conditions. The method disclosed by the invention has the following advantages: comprehensively considering the orthogonality and the system capacity of channels, reducing multi-user interference by utilizing multiuser diversity, being simple to implement and having lower complexity and better fairness.
Description
Technical field
The present invention relates to mimo wireless communication field, particularly relating in mimo wireless communication system for carrying out the method and apparatus of dispatching user facility.
Background technology
Mimo system can increase radio channel capacity and significantly improve communication quality.But in the up-link transmission of reality, due to the restriction by the condition such as power, volume, user terminal cannot adopt multiple antennas to configure, and is generally equipped with single antenna.In order to realize MIMO communication, proposing and two single-antenna subscriber devices are carried out dispatching the technology that formation virtual MIMO (V-MIMO) realizes space division multiplexing.Base station is chosen two or more users according to certain dispatching criterion and is carried out pairing formation multi-user MIMO transmissions, and dispatching criterion can affect the performance of whole system.
Existing dispatching criterion has following several:
1, random pair (RP): namely Stochastic choice second user in base station matches.
2, orthogonal pairing (OP): namely the base station selected user maximum with first subscriber channel orthogonality matches.Compound channel is H=[H
1h
2], wherein, H
1and H
2the respectively channel of representative of consumer equipment 1 and subscriber equipment 2, base station based on:
The subscriber equipment selecting D value maximum as pairing subscriber equipment, wherein,
3, determinant pairing (DP): the program is similar with orthogonal pairing (OP), unique difference is exactly the molecular moiety difference of criterion D expression formula, that is:
For above-mentioned three kinds of schemes, wherein, random pair (RP) scheme complexity is low, fairly simple, be easy to realize, but owing to not utilizing channel information, so the program cannot reach community maximum throughput, and this pairing scheme likely can produce serious interference and cannot effectively utilize resource; And orthogonal pairing (OP) scheme and determinant to match the implementation complexity of (DP) scheme relatively low; This two schemes is all that the subscriber equipment of selective channel maximum orthogonality matches, and reduces two inter-user interference; Although consider the orthogonality of channel, do not consider the signal to noise ratio of each user.
Therefore, how dispatched users, reduces pairing and to disturb and the capacity improving up-link is current Problems existing.
Summary of the invention
The object of this invention is to provide a kind of in mimo wireless communication system for carrying out the method and apparatus of dispatching user facility.
According to an aspect of the present invention, provide a kind of in based on the wireless communication system of MIMO for carrying out the method for dispatching user facility, wherein, the method comprises the following steps:
A obtains the channel information of multiple subscriber equipment;
B, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.
According to another aspect of the present invention, additionally provide a kind of in based on the wireless communication system of MIMO for carrying out the equipment of dispatching user facility, wherein, this equipment comprises:
Acquisition device, for obtaining the channel information of multiple subscriber equipment;
Dispatching device, for the channel information according to obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.
Compared with prior art, the present invention has the following advantages: the orthogonality and the power system capacity that have considered channel, utilize multi-user diversity to reduce multi-user interference, implements simply, has lower complexity and good fairness.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the system topological figure for carrying out dispatching user facility of the present invention;
Fig. 2 is the flow chart of the method for carrying out dispatching user facility of one aspect of the invention;
Fig. 3 is the flow chart of the method for carrying out dispatching user facility of another aspect of the present invention;
Fig. 4 is the equipment schematic diagram for carrying out dispatching user facility of one aspect of the invention;
Fig. 5 is that the present invention and random pair, orthogonal pairing and determinant match the Performance comparision schematic diagram of scheme;
In accompanying drawing, same or analogous Reference numeral represents same or analogous parts.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 shows the present invention for carrying out the system topological figure of dispatching user facility.Subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K can be the electronic equipments that any one can wirelessly communicate with controlling equipment 2, include but not limited to: mobile phone, PDA etc.Controlling equipment 2 can be the electronic equipment can dispatched subscriber equipment, and it includes but not limited to: 1) base station, such as, and BS, e-Node B; 2) network controller etc.The each self-contained at least one antenna of subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K, controlling equipment 2 comprises many antennas, thus, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K and controlling equipment 2 form the wireless communication system based on MIMO technology (multi user-multiple input multiple output techniques).
As a kind of optimal way, each subscriber equipment, such as, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K, only comprise an antenna separately, thus, between each subscriber equipment and controlling equipment 2, form the wireless communication system based on virtual MIMO (V-MIMO).
Fig. 2 shows one aspect of the invention for carrying out the flow chart of the method for dispatching user facility.
Concrete, in step S01, controlling equipment 2 obtains the channel information of multiple subscriber equipment.Such as, controlling equipment 2 obtains the channel information of subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K.
As a kind of optimal way, the mode that controlling equipment 2 obtains the channel information of each subscriber equipment can be the feedback from each subscriber equipment.Such as, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K are separately according to the channel information estimated separately and between controlling equipment 2 that transmits received, and such as, subscriber equipment 11 channel information estimated between self and controlling equipment 2 is H
1, subscriber equipment 12 channel information estimated between self and controlling equipment 2 is H
2... the subscriber equipment 1K channel information estimated between self and controlling equipment 2 is H
k, subsequently, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K by separately estimated channel information, such as: H
1, H
2... H
k, feed back to controlling equipment 2.The technology estimating channel information for the subscriber equipment information how basis receives due to those skilled in the art is known, therefore is not described in detail in this.
In addition, it should be appreciated by those skilled in the art that the mode that controlling equipment 2 obtains each user device channel information is not that the above is limited, such as, controlling equipment 2 can obtain the channel information etc. of each subscriber equipment from the base station with each communications of user equipment.
Then, in step S02, controlling equipment 2, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.Such as, controlling equipment 2 is according to the channel information H of obtained subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K
1, H
2... H
k, select the mode of matching between two of K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.
Subsequently, controlling equipment 2 or base station are that the running time-frequency resource that the user equipment allocation of having matched is identical carries out transfer of data.This process is known to those skilled in the art to be known, therefore is not described in detail in this.
Fig. 3 shows another aspect of the present invention for carrying out the flow chart of the method for dispatching user facility.
Concrete, in step S01 ', controlling equipment 2 obtains the channel information of multiple subscriber equipment.Such as, controlling equipment 2 is obtained the channel matrix H of subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K by base station (not shown)
1, H
2... H
k.
It should be appreciated by those skilled in the art that the mode that controlling equipment 2 obtains each user device channel information is not that the above is limited, such as, controlling equipment 2 obtain manner can also be the channel information etc. fed back to separately from each subscriber equipment.
Then, in step S02 ', controlling equipment 2, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction judgment criterion.
Wherein, the selection of K pairing subscriber equipment meets following judgment criterion:
User 1, and user 2 ..., user K}=argmax (D),
Wherein,
And, H=[H
1h
2h
k], wherein, H
irepresent the channel matrix of i-th subscriber equipment.Namely, K subscriber equipment matches to form combinations of pairs by controlling equipment 2 between two, corresponding D is gone out according to above-mentioned formulae discovery again based on each combinations of pairs, such as, controlling equipment 2 is based on { { subscriber equipment 11, subscriber equipment 12}, subscriber equipment 13, subscriber equipment 14} ... { this combinations of pairs between two of subscriber equipment 1K-1, subscriber equipment 1K}}, calculates D
1; Controlling equipment 2 is again based on { { subscriber equipment 11, subscriber equipment 13}, { { this combinations of pairs between two of subscriber equipment 1K-1, subscriber equipment 1K}}, calculates D for subscriber equipment 12, subscriber equipment 14} ...
2..., subsequently, controlling equipment 2 is from D
1, D
2... the matching method between two of the subscriber equipment corresponding to middle selection the maximum.
And if k=2, the selection of two pairing subscriber equipmenies then meets following judgment criterion:
Wherein,
(i, j=1,2 ... K; I ≠ j), and H
i, H
jrepresent the channel matrix of i-th subscriber equipment, a jth subscriber equipment respectively.
As a kind of optimal way, controlling equipment 2 can according to certain strategy, and such as, poll, equitable proportion etc., first select first user, and then chooses another pairing subscriber equipment according to above-mentioned judgment criterion.Such as, controlling equipment 2 first chooses a subscriber equipment according to equitable proportion strategy, such as, subscriber equipment 11, then controlling equipment 2 is again according to the judgment criterion that above-mentioned selection two pairing subscriber equipmenies adopt, in subscriber equipment 12 ... subscriber equipment 1K, select the subscriber equipment that can match with subscriber equipment 11, such as, select subscriber equipment 13; Subsequently, controlling equipment 2 chooses a subscriber equipment according to equitable proportion strategy again, such as, subscriber equipment 12, controlling equipment 2 is again according to the judgment criterion that above-mentioned selection two pairing subscriber equipmenies adopt, the subscriber equipment that can match with subscriber equipment 12 is selected in subscriber equipment 14 ... subscriber equipment 1K ... so controlling equipment 2 can obtain subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K matching method between two.
Subsequently, based on subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K matching method between two that controlling equipment 2 obtains, controlling equipment 2 or base station are that the running time-frequency resource that the user equipment allocation of having matched is identical carries out transfer of data.This process is known to those skilled in the art to be known, therefore is not described in detail in this.
Fig. 4 shows one aspect of the invention for carrying out the system schematic of dispatching user facility.This system comprises: subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K and controlling equipment 2.Wherein, controlling equipment 2 comprises: acquisition device 21 and dispatching device 22.
Concrete, acquisition device 21 obtains the channel information of multiple subscriber equipment.Such as, acquisition device 21 obtains the channel information of subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K.
As a kind of optimal way, the mode that acquisition device 21 obtains the channel information of each subscriber equipment can be the feedback from each subscriber equipment.Such as, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K are separately according to the channel information estimated separately and between controlling equipment 2 that transmits received, and such as, subscriber equipment 11 channel information estimated between self and controlling equipment 2 is H
1, subscriber equipment 12 channel information estimated between self and controlling equipment 2 is H
2... the subscriber equipment 1K channel information estimated between self and controlling equipment 2 is H
k, subsequently, subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K by separately estimated channel information, such as: H
1, H
2... H
k, feed back to controlling equipment 2.The technology estimating channel information for the subscriber equipment information how basis receives due to those skilled in the art is known, therefore is not described in detail in this.
In addition, it should be appreciated by those skilled in the art that the mode that acquisition device 21 obtains each user device channel information is not that the above is limited, such as, acquisition device 21 can obtain the channel information etc. of each subscriber equipment from the base station with each communications of user equipment.
Then, dispatching device 22, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.Such as, dispatching device 22 is according to the channel information H of obtained subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K
1, H
2... H
k, select the mode of matching between two of K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition.
Subsequently, controlling equipment 2 or base station are that the running time-frequency resource that the user equipment allocation chosen is identical carries out transfer of data.This process is known to those skilled in the art to be known, therefore is not described in detail in this.
Below by based on the system shown in Fig. 4, describe the process for carrying out dispatching user facility of this another aspect of system in detail.
Concrete, acquisition device 21 obtains the channel information of multiple subscriber equipment.Such as, acquisition device 21 obtains the channel matrix H of subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K from base station (not shown)
1, H
2... H
k.
It should be appreciated by those skilled in the art that the mode that acquisition device 21 obtains each user device channel information is not that the above is limited, such as, acquisition device 21 obtain manner can also be feed back to respective channel information etc. from each subscriber equipment.
Then, dispatching device 22, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction judgment criterion.
Wherein, the selection of K pairing subscriber equipment meets following judgment criterion:
User 1, and user 2 ..., user K}=arg max (D),
Wherein,
And, H=[H
1h
2h
k], wherein, H
irepresent the channel matrix of i-th subscriber equipment.Namely, K subscriber equipment matches to form combinations of pairs by dispatching device 22 between two, corresponding D is gone out according to above-mentioned formulae discovery again based on each combinations of pairs, such as, dispatching device 22 is based on { { subscriber equipment 11, subscriber equipment 12}, { { this combinations of pairs between two of subscriber equipment 1K-1, subscriber equipment 1K}}, calculates D for subscriber equipment 13, subscriber equipment 14} ...
1; Dispatching device 22 is again based on { { subscriber equipment 11, subscriber equipment 13}, { { this combinations of pairs between two of subscriber equipment 1K-1, subscriber equipment 1K}}, calculates D for subscriber equipment 12, subscriber equipment 14} ...
2..., subsequently, controlling equipment 2 is from D
1, D
2... the matching method between two of the subscriber equipment corresponding to middle selection the maximum.
If k=2, the selection of two pairing subscriber equipmenies then meets following judgment criterion:
Wherein,
(i, j=1,2 ... K; I ≠ j), and H
i, H
jrepresent the channel matrix of i-th subscriber equipment, a jth subscriber equipment respectively.
As a kind of optimal way, dispatching device 22 can according to certain strategy, and such as, poll, equitable proportion etc., first select first user, and then chooses another pairing subscriber equipment according to above-mentioned judgment criterion.Such as, dispatching device 22 first chooses a subscriber equipment according to equitable proportion strategy, such as, subscriber equipment 11, then controlling equipment 2 is again according to the judgment criterion that above-mentioned selection two pairing subscriber equipmenies adopt, in subscriber equipment 12 ... subscriber equipment 1K, select the subscriber equipment that can match with subscriber equipment 11, such as, select subscriber equipment 13; Subsequently, controlling equipment 2 chooses a subscriber equipment according to equitable proportion strategy again, such as, subscriber equipment 12, dispatching device 22 is again according to the judgment criterion that above-mentioned selection two pairing subscriber equipmenies adopt, the subscriber equipment that can match with subscriber equipment 12 is selected in subscriber equipment 14 ... subscriber equipment 1K ... so dispatching device 22 can obtain subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K matching method between two.
Subsequently, based on subscriber equipment 11, subscriber equipment 12 ... subscriber equipment 1K matching method between two that dispatching device 22 obtains, controlling equipment 2 or base station are that the running time-frequency resource that the user equipment allocation of having matched is identical carries out transfer of data.This process is known to those skilled in the art to be known, therefore is not described in detail in this.
Below with Simulation results, superiority of the present invention will be described.
Simulated conditions comprises: the transmitting power of each subscriber equipment is 10mW, noise power is 1mW, each subscriber equipment is for adopting least mean-square error (MMSE) receiver, the subscriber equipment be scheduled has 20, if be finally scheduled two subscriber equipmenies choose from 20 subscriber equipmenies, simulation result as shown in Figure 5, as can be seen from the figure subscriber equipment pairing scheme of the present invention, relative to existing scheme, orthogonal pairing scheme, the determinant pairing scheme of matching immediately, power system capacity can be significantly improved.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.In addition, obviously " comprising " one word do not get rid of other unit or step, odd number does not get rid of plural number.Multiple unit of stating in system claims or device also can be realized by software or hardware by a unit or device.First, second word such as grade is used for representing title, and does not represent any specific order.
Claims (7)
1. in based on the wireless communication system of MIMO for carrying out a method for dispatching user facility, wherein, the method comprises the following steps:
A obtains the channel information of multiple subscriber equipment;
B, according to the channel information of obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, and to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition, wherein, described predetermined condition comprises:
The selection of K pairing subscriber equipment meets following judgment criterion:
User 1, and user 2 ..., user K}=arg max (D),
Wherein,
And, H=[H
1h
2... H
k], wherein, H
irepresent the channel matrix of subscriber equipment i.
2. method according to claim 1, wherein, K is 2, and described predetermined condition comprises:
The selection of two pairing subscriber equipmenies meets following judgment criterion:
Wherein,
and H
i, H
jrepresent the channel matrix of subscriber equipment i, subscriber equipment j respectively.
3. method according to claim 1 and 2, wherein, described wireless communication system comprises based on V-MIMO wireless communication system.
4. in based on the wireless communication system of MIMO for carrying out an equipment for dispatching user facility, wherein, this equipment comprises:
Acquisition device, for obtaining the channel information of multiple subscriber equipment;
Dispatching device, for the channel information according to obtained multiple subscriber equipmenies, selects K pairing subscriber equipment, and to make the total system capacity of this K pairing subscriber equipment and mutually orthogonal sexual satisfaction predetermined condition, wherein, described predetermined condition comprises:
The selection of K pairing subscriber equipment meets following judgment criterion:
User 1, and user 2 ..., user K}=arg max (D),
Wherein,
And, H=[H
1h
2... H
k], wherein, H
irepresent the channel matrix of subscriber equipment i.
5. equipment according to claim 4, wherein, K is 2, and described predetermined condition comprises:
The selection of described two pairing subscriber equipmenies meets following judgment criterion:
Wherein,
and H
i, H
jrepresent the channel matrix of subscriber equipment i, subscriber equipment j respectively.
6. the equipment according to claim 4 or 5, wherein, described wireless communication system comprises the wireless communication system based on V-MIMO.
7. based on a system of MIMO, wherein, this system comprises equipment according to any one of claim 4 to 6 and multiple subscriber equipment.
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