CN102781112B - Method, system and base station for scheduling relay feedback link based on multi-user MIMO (Multiple Input Multiple Output) - Google Patents

Abstract

The invention provides a method, a system and a base station for scheduling a relay feedback link based on the multi-user MIMO (Multiple Input Multiple Output). The scheduling method comprises the following steps of determining a relay station active set of the base station; determining a priority level of each relay station in the relay station active set; and selecting relay stations which can be scheduled on a time-domain resource from the relay station active set according to a determined priority level sequence, and enabling a relativity between two optional relay stations in the selected relay stations which can be scheduled to be less than a relativity threshold value. According to the scheduling method provided by the invention, not only is the priority level of each relay station considered, but also the relativity between the relay stations is considered, thus the flow interference of the system is reduced, and the throughput of a feedback link is increased.

Description

Based on the relaying return link dispatching method of multiuser MIMO, system and base station thereof

Technical field

The application relates to wireless communication field, and more specifically, the present invention relates to based on the relaying return link dispatching method of multiuser MIMO (MU-MIMO), system and base station thereof.

Background technology

Relaying technique, as a kind of emerging technology, can increase coverage and improve power system capacity, being regarded as the key technology of forth generation mobile communication (4G).The throughput of relay system return link (eNB-RN) limits the throughput of whole system to a certain extent, becomes the bottleneck of throughput of system.This requires to adopt suitable technology and scheduling scheme to improve the capacity of return link in passback (Backhaul) link.

As shown in Figure 1, by the relaying return link scheduling scheme based on multiuser MIMO, base station (eNodeB) can at same running time-frequency resource (RB, Resource Block) the multiple relay station (RN1 of upper scheduling, RN2...), thus effectively promote the capacity of return link, to some extent solve the bottleneck effect of return link.But while acquisition spatial multiplexing gain, because different relay station shares same running time-frequency resource RB, disturb between the stream between relay station, limit the lifting of return link throughput.Therefore, under MU-MIMO scheduling scheme, how effectively reducing interference between the stream under same running time-frequency resource RB becomes the key promoting return link throughput.

Existing scheme carries out the scheduling of relaying return link during in base station, for PF (ProportionalFair) dispatching algorithm, calculate the priority being subordinated to each RN of this base station, and height is according to priority dispatched.

This method of carrying out dispatching according to RN priority ensure that the quality of transmission to a certain extent.But, in the scheduling process of existing scheme, only considered the priority of RN, do not consider the correlation between dispatched RN.This may cause the correlation between the RN that is scheduled on same running time-frequency resource RB larger, disturb also larger between corresponding stream, the received signal to noise ratio of RN end can be reduced to a certain extent, add the possibility of data re-transmission, thus the capacity of return link can be had influence on.

Summary of the invention

The object of the application be to provide a kind of at least partly can improve above-mentioned defect of the prior art a kind of return link dispatching method, system and base station thereof, to disturb between the stream reducing system, improve the throughput of return link.

According to an aspect of the application, disclose a kind of dispatching method of the relaying return link based on multiuser MIMO, comprising: the Relay stations activation collection determining base station; Determine that described Relay stations activation concentrates the priority of each relay station; From relay station Active Set, select schedulable relay station on running time-frequency resource according to determined priority orders, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

According to another aspect of the application, disclose a kind of base station realizing the dispatching method of relaying return link based on multiuser MIMO, comprising: determination module, determine the Relay stations activation collection of described base station; Computing module, calculates the priority that described Relay stations activation concentrates each relay station; And scheduler module, from relay station Active Set, select schedulable relay station on running time-frequency resource according to the order of priority, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

According to another aspect of the application, disclose a kind of dispatching patcher realizing relaying return link based on multiuser MIMO, comprise base station; And multiple relay station, wherein base station comprises further: determination module, determines the Relay stations activation collection of described base station; Computing module, calculates the priority that described Relay stations activation concentrates each relay station; And scheduler module, from relay station Active Set, select schedulable relay station on running time-frequency resource according to the order of priority, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

The priority that the present invention had not only considered relay station but also the correlation considered between relay station, thus disturb between the stream reducing system, improve the throughput of return link.

Accompanying drawing explanation

Fig. 1 shows the structure chart of relay system of the prior art.

Fig. 2 shows the flow chart of the scheduling scheme of a kind of execution mode according to the application.

Fig. 3 show according to the application with the schematic diagram of the horizontal sextant angle determination correlation formed between relay station and base station.

Fig. 4 shows the flow chart of the concrete scheduling scheme of a kind of execution mode according to the application.

Fig. 5 shows the block diagram of the dispatching patcher of a kind of execution mode according to the application.

Embodiment

With reference to the accompanying drawings the relaying return link dispatching method based on multiuser MIMO disclosed in the present application and base station thereof are described in detail.For simplicity's sake, in the explanation of each embodiment of the application, same or similar device employs same or analogous Reference numeral.

Fig. 2 shows the flow chart of the scheduling scheme of a kind of execution mode according to the application.As shown in the figure, in step 201, relay station (RN) Active Set of base station is determined.Here, the Relay stations activation collection of base station refers to the medium RN set to be scheduled in this base station, that is, get rid of the set of relay station that is available free or that have data retransmission in base station.

In step 202., determine that described Relay stations activation concentrates the priority of each relay station.According to a kind of embodiment, existing PF dispatching algorithm can be adopted, calculate the priority being subordinated to each RN of base station.According to another kind of embodiment, when determining the priority of relay station RN, the priority of each subscriber equipment (UE) of this RN can be calculated, and select the limit priority in each subscriber equipment of this RN as the priority of this RN.

In step 203, from relay station Active Set, select schedulable relay station on running time-frequency resource according to determined priority orders, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

Be appreciated that based in the return link dispatching method of MU-MIMO, a running time-frequency resource RB can dispatch the multiple relay station relay station of greater number (such as, two, three, four or).In prior art, only come dispatching of relays station according to the order of priority.Such as, for the running time-frequency resource RB that can dispatch two relay stations, the highest for priority two relay stations are distributed to this running time-frequency resource RB; Or, for the running time-frequency resource RB that can dispatch four relay stations, the highest for priority four relay stations are distributed to this running time-frequency resource RB.And according to the dispatching method of the application, when selecting schedulable relay station on running time-frequency resource from relay station Active Set according to priority orders, require that the correlation between any two relay stations in selected schedulable relay station is less than pre-determined relevancy threshold simultaneously.

Correlation between relay station refers to the correlation degree between two relay stations, is usually represented by the correlation between two channel impulse response vectors (under single-antenna case) between relay station and base station or matrix (in multiple antennas situation).Particularly, relay station RN _nwith relay station RN _mbetween correlation x _{n, m}can be expressed as

${\mathrm{\χ}}_{n,m}=\frac{{\left|\right|H_n{H_m}^H\left|\right|}_F}{{\left|\right|H_n\left|\right|}_F{\left|\right|H_m\left|\right|}_F}$

Wherein, the conjugate transpose of subscript H representing matrix, H _nand H _mrepresent relay station RN respectively _nand RN _mand the channel impulse response vector between base station or matrix.

But, be appreciated that the method comparison of the correlation adopted between above-mentioned formulae discovery two relay stations is complicated.For this reason, the application further provides a kind of method representing relay station correlation by angle, reduces the complexity of calculating, improves computational efficiency.

In addition, because the radial distance of relay station and base station is larger, related receptor relay station between relay station and the impact of horizontal sextant angle formed between base station comparatively large (wherein, horizontal sextant angle refers to the angle of the floor projection of the angle formed between relay station and base station), and almost can ignore by the impact of pitching angle (angle of the upright projection of the angle formed between relay station and base station).That is, in relay system, the horizontal sextant angle that can be formed between relay station and base station by two determines the correlation between two relay stations, and two horizontal sextant angles formed between relay station and base station are larger, and the correlation between two relay stations is relatively less.

The angle the following provided between relay station to base station can represent the theoretical proof of correlation between relay station.

In relay system, between general relay station and base station, there is direct path (LoS).In LoS scene, the power in direct projection footpath is generally better than the power in non-direct projection footpath, and the channel impulse response in direct projection footpath plays a decisive role in channel matrix.The channel impulse response production process in direct projection footpath is as follows:

Wherein, subscript u, s and n represent the numbering of receiving terminal, transmitting terminal and multipath respectively.K _rrepresent this K factor of Lay, d _srepresent the spacing of transmitting terminal antenna, d _urepresent the spacing of receiving terminal antenna, λ ₀represent the wavelength corresponding to carrier frequency, represent that signal is at the receiving terminal angle of arrival, φ _lOSrepresent that signal leaves angle, F at transmitting terminal _{rx, u, V}() and F _{rx, u, H}() receiving terminal antenna gain is in the vertical direction and the horizontal direction represented respectively.F _{tx, u, V}() and F _{tx, u, H}() transmitting terminal antenna gain is in the vertical direction and the horizontal direction represented respectively.

this part and the level of sending and receiving end antenna, vertically relevant with polarised direction, what rise in the generation of channel impulse response is randomized effect.Wherein the starting phase angle of LoS footpath in vertical polarization directions, the starting phase angle of LoS footpath in horizontal polarization directions.

In formula these two parts are make a start and the phase difference of receiving end respectively, exp (j2 π v _lOSt) be that translational speed and direction are on the impact of phase place.

Although the time delay of the channel impulse response in each footpath of each user is independently stochastic generation, but the impulse response of channel matrix decomposed for SVD used in reality be all through merging after, and the channel impulse response in direct projection footpath is generally incorporated in the first row in channel matrix:

In formula, a _{w, i}represent the impulse response in non-direct projection footpath.

Due to K _raverage be 9dB, so generally | b| ²> > | a _{w, i}| ².Decompose the beamforming vector of acquisition thus:

$w\≈{[\exp (-j*0*d_s*2\mathrm{\π}*{\mathrm{\λ}}_0^{-1}*\sin \left({\mathrm{\φ}}_{\mathrm{LOS}}\right))/\sqrt{8},...,\exp (-j*7*d_s*2\mathrm{\π}*{\mathrm{\λ}}_0^{-1}*\sin \left({\mathrm{\φ}}_{\mathrm{LOS}}\right))/\sqrt{8}]}^T$

The problem that we are concerned about is, current service user is to the interference of disturbed user and the relation of angle between them.Conveniently discuss, might as well φ be made _lOS=0, then φ ' _lOSthe angle between current service user and disturbed user can be represented, that is, two horizontal sextant angles formed between relay station and base station.Now:

$w\≈{[1/\sqrt{8},...,1/\sqrt{8}]}^T$

$H^{\′}w=\left[\begin{array}{c}\frac{1}{\sqrt{8}}\underset{n=1}{\overset{8}{\mathrm{\Σ}}}{a}_{1,n}^{\′}+\frac{b^{\′}}{\sqrt{8}}\underset{k=0}{\overset{7}{\mathrm{\Σ}}}\exp (j*k*d_s*2\mathrm{\π}*\sin \left({\mathrm{\φ}}_{\mathrm{LOS}}^{\′}\right))\\ .\\ .\\ .\\ \frac{1}{\sqrt{8}}\underset{i=1}{\overset{8}{\mathrm{\Σ}}}{a}_{w,i}^{\′}\end{array}\right]$

Due to a ' _{w, i}represent the impulse response in non-direct projection footpath, therefore the interference obtaining current service user and disturbed user is caused can be similar to:

${\left|\right|H^{\′}w\left|\right|}^2\≈\frac{{\left|b^{\′}\right|}^2}{8}{\left|\underset{k=0}{\overset{7}{\mathrm{\Σ}}}\exp (j*k*d_s*2\mathrm{\π}*\sin \left({\mathrm{\φ}}_{\mathrm{LOS}}^{\′}\right))\right|}^2$

Due to when dispatching of relays station, same running time-frequency resource is only related to usually to the problem of dispatching the relay station of same community, consider the distribution of relay station and the symmetry of sector, we can by φ ' _lOSspan be decided to be 0-70 degree.We might as well suppose | b ' | ²=1, now, along with φ ' _lOSthe continuous increase of angle, current service user reduces and successful gradually to the interference that disturbed user causes.

As can be seen from above-mentioned proof, due to the condition of the Signal transmissions general satisfaction LoS scene between base station and relay station, therefore when two relay stations are served in base station simultaneously, the horizontal sextant angle between two relay stations to base station is larger, then the interference between relay station is less.This conclusion can be generalized to the scene that multiple relay station is served in base station simultaneously.

According to a kind of execution mode, prestore the angular position relative between each relay station and base station in a base station.Like this, any two horizontal sextant angles formed between relay station and base station can be calculated according to stored angular position relative, determine the correlation between two relay stations.

Fig. 3 comprises the scheme of 6 relay stations to show the horizontal sextant angle of correlation between relay station for every sector.When every 6 relay stations in sector, the distribution of RN as shown in Figure 3.Now, the horizontal sextant angle that in sector, each RN and base station are formed is fixing.Be that initial point sets up rectangular coordinate system with base station, as shown in Figure 3.So, RN _nand RN _mhorizontal sextant angle between eNode B is

Δθ _n，m＝|θ _n-θ _m|

Wherein, θ _nfor RN _nand the horizontal sextant angle between the line of base station and X-axis, θ _mfor RN _mand the horizontal sextant angle between the line of base station and X-axis.

In the present embodiment, the angular position relative between each relay station and base station can be prestored in a base station, such as, the horizontal sextant angle between the line of each relay station and base station and X-axis.Thus base station can calculate any two horizontal sextant angles formed between relay station and base station according to stored angular position relative, to determine the correlation between two relay stations.

As mentioned above, the horizontal sextant angle formed between relay station and base station is larger, and the correlation between user is relatively less, that is: RN _nand RN _mbetween horizontal sextant angle Δ θ _{n, m}larger, RN _nand RN _mbetween correlation just relatively less.

Based on this, according to a kind of execution mode of the application, the horizontal sextant angle formed between relay station and base station by two represents the correlation between two relay stations, and require selected by schedulable relay station in any two relay stations between correlation be less than predetermined angle threshold value θ _min, work as RN _nwith RN _mbetween horizontal sextant angle Δ θ _{n, m}when meeting following relation, RN _mfor schedulable relay station:

Δθ _n，m＝|θ _n-θ _m|≥θ _min $\∀m\∈W$

Wherein, gather W and represent schedulable relay station set on certain running time-frequency resource, RN _nrepresent certain RN, RN of being scheduled in set W _mrepresent certain RN that set W is not scheduled outward.Wherein, angle threshold value θ _mincan preset according to practical application scene.According to a kind of embodiment, such as angle threshold value can be selected between 10-30 degree, such as, be 10 degree, 20 degree or 30 degree.Angle threshold value is larger then more weak to the Selection effect of relaying correlation.

According to another kind of execution mode, when adopting mobile-relay station, angular position relative between relay station and base station can be calculated by base station.Such as, base station can calculate the line of any relay station and base station and antenna square to the horizontal sextant angle between (X-axis such as shown in Fig. 3) by existing beamforming algorithm (as GOB algorithm), to calculate any two horizontal sextant angles formed between relay station and base station further, determine the correlation between two relay stations.

Owing to the correlation calculations of complexity to be reduced to the linear calculating of horizontal sextant angle between RN, so relatively reduce the complexity of algorithm, while the efficiency ensureing dispatching algorithm, improve the performance of system call.

The relaying return link dispatching method of an embodiment of the invention is described in detail below in conjunction with Fig. 4.According to the method, priority and the correlation of RN can be considered, set up the scheduling collection of running time-frequency resource RB, to realize selecting relay station RN to carry out transfer of data.

In step 401, the Relay stations activation collection of base station is determined.Here, the Relay stations activation collection of base station refers to the medium relay station set to be scheduled in this base station, that is, get rid of the set of all relay stations that are idle or that have data retransmission in base station.

Be appreciated that when return link is dispatched have the RN of data retransmission should prioritised transmission data retransmission.Such as, uplink hybrid automatic repeat request (HARQ) information can be passed through in base station, judges whether have data retransmission on running time-frequency resource RB, if having, then and the relay station RN directly corresponding to schedule re-transmission data and subscriber equipment thereof.Here, determine whether that the mode of relay station that is idle or that have data retransmission belongs to prior art, do not repeat them here.And for busy and there is no the relay station of data retransmission, then need to adopt suitable dispatching method to dispatch, to disturb between the stream reducing system, and improve the throughput of return link.

In step 402, determine that Relay stations activation concentrates the priority of each relay station.According to a kind of embodiment, existing PF dispatching algorithm can be adopted, calculate the priority being subordinated to each RN of base station.According to another kind of embodiment, when determining the priority of certain relay station, the priority of each subscriber equipment of this relay station can be calculated, and select the limit priority in each subscriber equipment of this relay station as the priority of this relay station.

In step 403, select the relay station RN of the first priority as the first schedulable relay station on running time-frequency resource RB.

As previously mentioned, a running time-frequency resource RB can dispatch multiple relay station RN.According to the return link dispatching method of the application, after determining the first schedulable relay station of running time-frequency resource RB, can consider priority and the correlation each other thereof of each relay station, iteration selects other schedulable relay station.

In step 404, select according to priority sequential iteration from high to low the schedulable relay station meeting related condition between the schedulable relay station selected.

According to a kind of embodiment, when carrying out iteration and selecting, first can judge whether the correlation between the relay station of the second priority and the first schedulable relay station is less than default relevance threshold, if be less than, then select the relay station of this second priority to be the second schedulable relay station.Otherwise, be less than the relay station of default relevance threshold as the second schedulable relay station according to the correlation between priority selective sequential from high to low and the first schedulable relay station.After this, continue according to priority selective sequential from high to low and the schedulable relay station selected (such as, first and second schedulable relay stations) between the schedulable relay station meeting related condition (such as, 3rd schedulable relay station), until the schedulable relay station quantity on this running time-frequency resource RB reaches maximum, that is, the quantity of total schedulable relay station that a running time-frequency resource RB can support is reached in system.Now, the relay station scheduling of a running time-frequency resource RB is completed.

If after iteration selection terminates, selected by the schedulable relay station quantity satisfied condition that goes out when not reaching the maximum of schedulable relay station quantity on this running time-frequency resource RB, then can not consider the correlation between relay station, concentrate the priority of non-selected relay station order to select remaining relay station on this running time-frequency resource RB according to Relay stations activation, complete the relay station scheduling of this running time-frequency resource RB.

According to another kind of embodiment, in order to realize the step selecting to meet between the schedulable relay station selected the schedulable relay station of related condition in above-mentioned steps 404 according to priority sequential iteration from high to low, passable, first calculate Relay stations activation concentrate non-selected relay station and selected go out schedulable relay station (the first schedulable relay station such as, gone out selected in step 403) between correlation.Find out all and selected go out schedulable relay station between meet the relay station of related condition.In the set of found out relay station, select relay station that priority is the highest as second schedulable relay station.The above-mentioned calculating of iteration in the set of found out relay station, to search and selection course, until schedulable relay station quantity reaches maximum on this running time-frequency resource RB, that is, the quantity of the total schedulable relay station in system, a running time-frequency resource RB can supported is reached.Now, the relay station scheduling of a running time-frequency resource RB is completed.

If after iteration selection terminates, selected by the schedulable relay station quantity satisfied condition that goes out when not reaching the maximum of schedulable relay station quantity on this running time-frequency resource RB, then can not consider the correlation between relay station, concentrate the priority of non-selected relay station order to select remaining relay station on this running time-frequency resource RB according to Relay stations activation, complete the relay station scheduling of this running time-frequency resource RB.

According to another aspect of the application, disclose a kind of dispatching patcher realizing relaying return link based on multiuser MIMO.As shown in Figure 5, dispatching patcher comprises base station 500 and multiple relay station 600.According to the application, in dispatching patcher, the Relay stations activation collection in relay station 600 can be determined in base station 500; Determine that described Relay stations activation concentrates the priority of each relay station; And from relay station Active Set, select schedulable relay station on running time-frequency resource according to determined priority orders, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

To further describe according to the realization of the application based on the base station 500 in the dispatching patcher of the relaying return link of multiuser MIMO below.As shown in Figure 5, base station 500 comprises determination module 510, computing module 520 and scheduler module 530.

Determination module 510 determines the Relay stations activation collection of base station 500.Here, the Relay stations activation collection of base station refers to the medium RN set to be scheduled in this base station, that is, get rid of the set of relay station that is available free or that have data retransmission in base station.

Computing module 520 calculates the priority that Relay stations activation concentrates each relay station.According to a kind of embodiment, existing PF dispatching algorithm can be adopted, calculate the priority being subordinated to each RN of base station.According to another kind of embodiment, when determining the priority of relay station RN, the priority of each subscriber equipment of this RN can be calculated, and select the limit priority in each subscriber equipment of this relay station RN as the priority of this RN.

Scheduler module 530, selects schedulable relay station on running time-frequency resource according to the order of priority from relay station Active Set, makes the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.Be appreciated that based in the return link dispatching method of MU-MIMO, a running time-frequency resource RB can dispatch the multiple relay station relay station of greater number (such as, two, three, four or).In prior art, only come dispatching of relays station according to the order of priority.And according to the dispatching method of the application, when selecting schedulable relay station on running time-frequency resource from relay station Active Set according to priority orders, require that the correlation between any two relay stations in selected schedulable relay station is less than pre-determined relevancy threshold simultaneously.

According to a kind of execution mode, scheduler module 530 comprises angle determination module 531 further and selects module 532.Angle determination module 531 determines the horizontal sextant angle formed between relay station and base station, and wherein, the correlation between two relay stations is determined by described two horizontal sextant angles formed between relay station and base station, and pre-determined relevancy threshold is predetermined angle threshold value.Select module 532 from relay station Active Set, to select schedulable relay station on running time-frequency resource according to the order of priority, make any two horizontal sextant angles formed between relay station and base station in selected schedulable relay station be less than predetermined angle threshold value.

According to another kind of embodiment, angle determination module 531 is previously stored with the angular position relative table between each relay station and base station in base station, and can determine two horizontal sextant angles formed between relay station and base station according to angular position relative table.

According to another kind of embodiment, when adopting mobile-relay station, angle determination module 531 calculates the angular position relative between relay station and base station, and determines two horizontal sextant angles formed between relay station and base station according to calculated angular position relative.Such as, base station can pass through existing beamforming algorithm (as GOB algorithm) calculate the line of any relay station and base station and antenna square to horizontal sextant angle, to calculate any two horizontal sextant angles formed between relay station and base station further, determine the correlation between two relay stations.

According to a kind of execution mode of the application, select module 532 to be configured to the relay station RN of selection first priority as the first schedulable relay station on running time-frequency resource RB, and select the correlation met between the schedulable relay station selected to be less than the schedulable relay station of pre-determined relevancy threshold according to priority sequential iteration from high to low.Alternatively, if after iteration selection terminates, selected by the schedulable relay station quantity that goes out when not reaching the maximum of schedulable relay station quantity on described running time-frequency resource, select module 532 priority of non-selected relay station order can be concentrated to select remaining schedulable relay station on described running time-frequency resource according to Relay stations activation.

Be described with reference to the exemplary embodiment of accompanying drawing to the application above.Those skilled in the art should understand that; above-mentioned embodiment is only used to the object that illustrates and the example of lifting; instead of be used for limiting; the any amendment done under all instructions in the application and claims, equivalently to replace, all should be included in and this application claims in the scope of protection.

Claims (16)

1., based on a dispatching method for the relaying return link of multiuser MIMO, comprising:

Determine the Relay stations activation collection of base station;

Determine that described Relay stations activation concentrates the priority of each relay station; And

From relay station Active Set, select schedulable relay station on running time-frequency resource according to determined priority orders, make the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

2. dispatching method according to claim 1, wherein, the correlation between two relay stations is determined by described two horizontal sextant angles formed between relay station and base station.

3. dispatching method according to claim 2, comprises the angular position relative prestoring in a base station and formed between each relay station in described base station and described base station further.

4. dispatching method according to claim 2, comprises the angular position relative calculating and formed between relay station and described base station further.

5. the dispatching method according to any one in claim 1-4, wherein, from relay station Active Set, select schedulable relay station on running time-frequency resource according to determined priority orders, the step making the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold comprises:

Select the relay station of the first priority as the first schedulable relay station on running time-frequency resource; And

The correlation between the schedulable relay station selected is selected to be less than the schedulable relay station of pre-determined relevancy threshold according to priority sequential iteration from high to low.

6. dispatching method according to claim 5, wherein, the step selecting the correlation between the schedulable relay station selected to be less than the schedulable relay station of pre-determined relevancy threshold according to priority sequential iteration from high to low comprises further:

Judge whether the correlation between the relay station of the second priority and the first schedulable relay station is less than pre-determined relevancy threshold;

When the result judged is as being less than default relevance threshold, the relay station of described second priority is selected to be the second schedulable relay station, otherwise, be less than the relay station of pre-determined relevancy threshold as the second schedulable relay station according to the correlation between priority selective sequential from high to low and the first schedulable relay station; And

The above-mentioned judgement of iteration and selection step, until schedulable relay station quantity reaches maximum on described running time-frequency resource.

7. dispatching method according to claim 6, comprises further:

If after iteration selection terminates, selected by the schedulable relay station quantity that goes out when not reaching the maximum of schedulable relay station quantity on described running time-frequency resource, concentrate the priority of non-selected relay station order to select remaining schedulable relay station on described running time-frequency resource according to Relay stations activation.

8. dispatching method according to claim 5, wherein, the step selecting the correlation between the schedulable relay station selected to be less than the schedulable relay station of pre-determined relevancy threshold according to priority sequential iteration from high to low comprises further:

Calculate described Relay stations activation concentrate non-selected relay station and selected go out the first schedulable relay station between correlation;

The correlation found out between all and the first schedulable relay station is less than the relay station of pre-determined relevancy threshold;

In found out relay station, select relay station that priority is the highest as the second schedulable relay station; And

The above-mentioned calculating of iteration, search and select step, until schedulable relay station quantity reaches maximum on described running time-frequency resource.

9. dispatching method according to claim 8, wherein, comprises further:

If after iteration selection terminates, selected by the schedulable relay station quantity that goes out when not reaching the maximum of schedulable relay station quantity on described running time-frequency resource, concentrate the priority of non-selected relay station order to select remaining schedulable relay station on described running time-frequency resource according to Relay stations activation.

10. realize the base station based on the dispatching method of the relaying return link of multiuser MIMO, comprising:

Determination module, determines the Relay stations activation collection of described base station;

Computing module, calculates the priority that described Relay stations activation concentrates each relay station; And

Scheduler module, selects schedulable relay station on running time-frequency resource according to the order of priority from relay station Active Set, makes the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.

11. base stations according to claim 10, described scheduler module comprises further:

Angle determination module, determines the horizontal sextant angle formed between relay station and base station, and wherein, the correlation between two relay stations is determined by the horizontal sextant angle formed between described two relay stations and described base station; And

Select module, concentrate selection schedulable relay station on running time-frequency resource according to the order of priority from described Relay stations activation, make any two horizontal sextant angles formed between relay station and base station in selected schedulable relay station be less than predetermined angle threshold value.

12. base stations according to claim 11, wherein, described angle determination module is previously stored with the angular position relative table between each relay station in described base station and described base station, and determines the horizontal sextant angle that formed between two relay stations and described base station according to described angular position relative table.

13. base stations according to claim 11, wherein, described angle determination module calculates the angular position relative between relay station and base station, and determines two horizontal sextant angles formed between relay station and base station according to calculated angular position relative.

14. base stations according to any one in claim 10-13, wherein, described selection module is configured to: select the relay station of the first priority as the first schedulable relay station on running time-frequency resource; And select the correlation between the schedulable relay station selected to be less than the schedulable relay station of pre-determined relevancy threshold according to priority sequential iteration from high to low.

15. base stations according to claim 14, wherein, described selection module is configured to: if iteration select terminate after, selected by the schedulable relay station quantity that goes out when not reaching the maximum of schedulable relay station quantity on described running time-frequency resource, concentrate the priority of non-selected relay station order to select remaining schedulable relay station for described running time-frequency resource according to Relay stations activation.

16. 1 kinds of dispatching patchers realized based on the relaying return link of multiuser MIMO, comprise

Base station; And

Multiple relay station, wherein base station comprises further:

Determination module, determines the Relay stations activation collection of described base station;

Computing module, calculates the priority that described Relay stations activation concentrates each relay station; And

Scheduler module, selects schedulable relay station on running time-frequency resource according to the order of priority from relay station Active Set, makes the correlation between any two relay stations in selected schedulable relay station be less than pre-determined relevancy threshold.