CN101034923A - Packet scheduling method and system for multi-antenna radio communication system - Google Patents
Packet scheduling method and system for multi-antenna radio communication system Download PDFInfo
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- CN101034923A CN101034923A CNA2006100597855A CN200610059785A CN101034923A CN 101034923 A CN101034923 A CN 101034923A CN A2006100597855 A CNA2006100597855 A CN A2006100597855A CN 200610059785 A CN200610059785 A CN 200610059785A CN 101034923 A CN101034923 A CN 101034923A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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Abstract
This invention discloses some packet scheduling methods open for a multi-user multi-antenna wireless communication system, according to the average transmission capacity of all users in the past period of time dynamically division. In a scheduling time, only a certain group of users involved in scheduling the polling on time way will be used between two different groups. And the invention gives two ways to calculate the average transmission capacity together with two ways to divide users through dividing users; the invention reducesthe number of users involved at the same time, which can effectively reduce the overhead system of feedback, as well as scheduling computing complexity. In addition, the use of two methods of dividing users supplied by the invention increases system throughput and the effective of user fairness.
Description
Technical field
The present invention relates to the method and system of the multi-user's packet scheduling in the multi-aerial radio communication system, particularly, relate to a kind of can the grouping to the user terminal in the cordless communication network, constantly only there is the user in a certain group to participate in communication scheduling in some scheduling, thus the method and system of multi-user's packet scheduling of feedback overhead in the reduction system and scheduling computational complexity.
Technical field
Along with the fusion gradually of wireless network and internet, people are more and more higher to the requirement of the type of radio communication service and quality, and are also more and more higher to the requirement of the rate of information throughput.How to improve the rate of information throughput and be one of subject matter that future broadband wireless communication systems faces.In order to realize this goal on limited frequency spectrum resources, many antennas multiple-input and multiple-output (MIMO) technology has become one of requisite means that adopted in the following radio communication.In mimo system, transmitting terminal utilizes many antennas to carry out the transmission of signal, and receiving terminal utilizes many antennas to carry out the reception of spacing wave.Studies show that than traditional single antenna transmissions method, the MIMO technology can improve channel capacity significantly, thereby improve the rate of information throughput.
In recent years, along with deepening continuously that mimo system is studied, people arrive the emphasis Single User MIMO system turning point from point to points of research the multi-user MIMO system of multiple spot gradually.For multi-user MIMO system, the multi-user diversity technology is an important technology of wherein using.The information theory result of study shows, by adopting the multi-user diversity technology, can improve the down channel capacity of multi-user system effectively.
In fact so-called multi-user diversity is exactly a kind of multi-subscriber dispatching technology that is applied to transmitting terminal.From broadly, can think that the transfer of data between base station and a plurality of user terminal is undertaken by each Resource Unit.For different communication systems, Resource Unit can have different implications, for example, can be the moment, a subcarrier on the frequency domain, a transmitting antenna on the spatial domain on the time domain, or the like.In the multi-user comm of reality, because the residing geographical position of each user terminal and environment is different, and the existence of wireless channel signal fadeout, make that the characteristic of channel of different user terminals on same Resource Unit is different.The multi-user diversity technology is considered based on this characteristic, it is by carrying out multi-subscriber dispatching at transmitting terminal, that is to say, the characteristic of channel that at first compares each user terminal on each Resource Unit, then each resource units is distributed to the best user terminal of the characteristic of channel, thereby can be improved the total capacity of down link effectively.
Fig. 1 shows the structural representation of the multi-user MIMO system of available technology adopting multi-subscriber dispatching technology.
As shown in Figure 1, in the down link of this multi-user MIMO system, a base station 101 and a K mobile radio station (as 111,121) have been comprised as transmitting terminal.At transmitting terminal, base station 101 comprises data storage cell 102, scheduling unit 103, MIMO transmitting element 104 and n
TIndividual transmitting antenna 105.In K user terminal (mobile radio station) as receiving terminal, each user terminal k (k=1,2 ..., K) respectively comprise n
R(k) individual reception antenna, a channel estimating unit and a MIMO detecting unit.For example, concerning user terminal 111, it has comprised n
R(1) individual reception antenna 112, channel estimation module 114 and MIMO detection module 113.Equally, user terminal 121 has comprised n
R(1) individual reception antenna 122, channel estimating unit 124 and MIMO detecting unit 123.
Specifically, at transmitting terminal, stored in the data storage cell 102 in the base station 101 wait for send to each user terminal k (k=1,2 ..., data K).The data of each user terminal of storage are dispatched in 103 pairs of data memory cell 102 of scheduling unit, and give MIMO transmitting element 104 according to the result of scheduling extracts relative users from data storage cell 102 data.
At this, scheduling unit 103 need use the channel characteristic information of current each user terminal when the data of each user terminal are dispatched.Each channel characteristic information can utilize matrix H
1(t), H
2(t) ..., H
K(t) expression, wherein H
k(t) (k=1,2 ..., the K) characteristic of channel matrix of expression base station 101 between the t moment and user terminal k, its number of lines and columns are respectively n
R(k) and n
T(being the quantity of reception antenna and the quantity of transmitting antenna).This channel characteristic information H
k(t) can by channel estimating unit by comprising separately of each user terminal of receiving terminal (114,124...) estimate to obtain, and the gained result fed back to transmitting terminal by feedback channel 151.
At transmitting terminal, scheduling unit 103 is connected to MIMO transmitting element 104, and will offer MIMO transmitting element 104 through the data to be sent of scheduling.MIMO transmitting element 104 at first becomes n with the signal transformation that scheduling unit 103 is sent here
TIndividual parallel data stream, the wherein corresponding transmitting antenna of each substream of data.Then, again these parallel sub-flow points are not encoded, interweaved and modulation operations, go out by antenna transmission at last.
At receiving terminal, each user terminal k (k=1,2 ..., K) utilize respectively separately channel estimating unit (114,124...), the pilot signal that send base station 101 is estimated, thereby is obtained characteristic of channel matrix H between base station 101 and this user terminal
k(t) (k=1,2 ..., K).Next, on the one hand, each user terminal is with characteristic of channel matrix H
k(t) send back to the scheduling unit 103 of transmitting terminal by feedback channel 151, dispatch by 101 pairs of each user data in base station.On the other hand, and channel estimating unit in the user terminal (114, the 124...) characteristic of channel matrix H of estimation gained
k(t) also will offer MIMO detecting unit in the user terminal (113,123...), be used for carrying out to the received signal MIMO and detect.
At present, the multi-subscriber dispatching technology that is applied in the mimo system mainly is divided into following two classes:
(1) simple multi-subscriber dispatching based on the time-division.Specifically, be at each delivery time, the base station is chosen a user terminal according to predetermined criteria and is communicated according to the current characteristic of channel between itself and each user terminal from all user terminals.
(2) simultaneously based on time-division and the empty multi-subscriber dispatching that divides.Specifically, be at each delivery time, the base station is according to the current characteristic of channel between itself and each user terminal, from all user terminals, choose a plurality of user terminals according to predetermined criteria and communicate (, therefore possessing simultaneously the ability that communicates with a plurality of user terminals) simultaneously because the base station has a plurality of transmitting antennas.
For the multi-user dispatching method of above existing application in mimo system, one of them common feature is: at each delivery time, transmitting terminal need compare the characteristic of channel between itself and all user terminals, and therefrom chooses only one or more user terminal and communicate.Yet these class methods exist following shortcoming or the improved place of needs:
(1) feedback overhead is big.According to existing method, when transmitting terminal carries out multi-subscriber dispatching at each delivery time, all be from all users, to choose the user according to certain criterion to communicate.In each scheduling process constantly, transmitting terminal need be known current all users' the characteristic of channel.And in general communication system, the characteristic of channel that transmitting terminal utilized all comes from the channel estimating and the feedback of receiving terminal.Therefore, each scheduling constantly all needs all users to the base station feedback characteristic of channel separately in the existing method, will inevitably bring the big problem of feedback overhead like this.
(2) complexity height.The process that the process of multi-subscriber dispatching is actually a comparison and chooses, that is, the performance when at first relatively base station and each user terminal communicate is therefrom chosen the result of the best user of several performances as scheduling then.When total number of users is very big, this comparison and the process of choosing will become very complicated.Especially at the same time based in time-division and the empty multi-subscriber dispatching that divides, often adopt the dispatching method of iteration.Participate in the total number of users of scheduling when very big when this moment, whole scheduling process will be difficult to because of complexity is too high realize.
(3) fairness problem.So-called fairness, referring to the chance that each user is chosen in scheduling process will equate as far as possible.For each user, the factor that influences its characteristic of channel also has slow fading and near-far problem except rapid fading.When total number of users is very big, be in remote or the very serious user of shadow fading for some, be difficult to have an opportunity after scheduling, to be chosen and communicate with the base station.Although can take some to improve the method for fairness to this situation, for example adopt dispatching method based on equitable proportion.Yet therefore this method has considerable restraint because of its signal to noise ratio (snr) after needing calculated in advance to receive on using.For example, at the same time based in time-division and the empty multi-subscriber dispatching that divides, the SNR value after just can't the calculated in advance reception under a lot of situations.
Can find that by foregoing description the problems referred to above are all relevant with the sum of the user terminal that participates in scheduling simultaneously.The sum of the user terminal of participation scheduling simultaneously is big more, and the problems referred to above are serious more.Based on the above consideration to traditional multi-user dispatching method, the present invention proposes a kind of grouping scheduling method of the MIMO of being used for multi-user system.In the method, at first all users are divided into groups, in some scheduling constantly, only have some group of interior user terminal to participate in scheduling.The employing time is gone up the method for poll between group and the group, that is, according to certain sequencing, in the different scheduling moment user in is on the same group not dispatched.In addition, not changeless to user's grouping, user's grouping situation difference in the different time periods.
This method has reduced the quantity of the user terminal of synchronization participation scheduling by adopting the mode to the user terminal grouping, thus the feedback overhead in the reduction system effectively, and the complexity of scheduling computing.In addition, in the different time periods, system can also be optimized the user grouping situation according to the channel statistical characteristic of each user terminal in this time period, thereby further improves the whole throughput performance of system and the fairness between the user.
Summary of the invention
In view of the above problems, the purpose of this invention is to provide a kind of multi-user's grouping scheduling method and system that is used for multi-aerial radio communication system, can reduce the feedback overhead in the multi-antenna multi-user scheduling, and the complexity of computing, simultaneously throughput of system and user fairness are optimized.
According to an aspect of the present invention, provide the grouping scheduling method in a kind of multi-antenna multi-user wireless communication system, comprise step: calculate the user terminal interior average transmission ability of predetermined time interval in the past; According to the user terminal average transmission ability of calculating user terminal is divided into groups; During each transmitting time, only the user terminal in the grouping is dispatched; With according to the transmitting time order, successively the user terminal in the follow-up grouping is dispatched.
According to another aspect of the present invention, grouping scheduling method in a kind of multi-antenna multi-user wireless communication system is provided, comprises step: the average transmission ability in the predetermined time interval in the past between each calculation base station in a plurality of travelling carriages and described each travelling carriage; Divide into groups to described a plurality of travelling carriages according to the described average transmission ability of calculating in the base station; With according to time sequencing, the base station during each transmitting time, successively to each the grouping in travelling carriage dispatch, wherein during a transmitting time, only the travelling carriage in the grouping is dispatched.
According to a further aspect of the invention, provide the packet scheduling system in a kind of multi-antenna multi-user wireless communication system, comprising: the base station, have data storage cell, be used to store the data that wait sends to each travelling carriage; Scheduling unit is used for travelling carriage is divided into groups and dispatching according to the travelling carriage feedack, and extracts the data that will send to corresponding travelling carriage according to the result of grouping and scheduling from data storage cell; Many antenna transmission unit, be used for the data conversion that scheduling unit provides is become parallel data stream the corresponding transmitting antenna of each substream of data, a plurality of travelling carriages, each travelling carriage has channel estimating unit, is used to estimate the characteristic of channel between base station and the corresponding travelling carriage; Average transmission ability computing unit, be used for according to the described characteristic of channel of estimating, the average transmission ability between calculation base station and the corresponding travelling carriage, many antenna detection unit, be used for carrying out to the received signal many antenna detection, the average transmission ability of wherein said calculating is fed back to the base station.
According to grouping scheduling method and the system in the multi-antenna multi-user wireless communication system of the present invention, utilize each user in the past the average transmission ability in the time period dynamically all user terminals are divided into groups.In a certain scheduling constantly, the user terminal in only having some group participates in scheduling, and the last method of poll of employing time between group and the group.Simultaneously, also provide the method for calculating the average transmission ability among the present invention, and the method that user terminal is divided into groups.
To the method for user terminal grouping, reduced the quantity of the user terminal of synchronization participation scheduling according to the present invention, thus the feedback overhead in the reduction system effectively, and the complexity of scheduling computing.In addition, the user terminal group technology that adopts the present invention to propose can also improve throughput of system and improve at the user terminal fairness.
Description of drawings
By reading and understanding the detailed description of the preferred embodiment of the present invention being done below with reference to accompanying drawing, these and other objects of the present invention, feature and advantage will be become apparent.Wherein:
Fig. 1 is the structural representation that the multi-user MIMO system of the multi-user dispatching method that adopts prior art is described;
Fig. 2 is the structural representation according to the multiuser MIMO packet scheduling system of the embodiment of the invention;
Fig. 3 is the schematic diagram according to the multi-user data scheduling unit of the embodiment of the invention;
Fig. 4 is the flow chart of the method for a plurality of user terminals being divided into groups according to the embodiment of the invention;
Fig. 5 is the fairness property comparison schematic diagram of the method according to this invention and art methods; With
Fig. 6 is the volumetric properties contrast schematic diagram of the method according to this invention and art methods.
Embodiment
With reference to the accompanying drawings embodiments of the invention are elaborated, having omitted in the description process is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
The difference of the inventive method and conventional method is: in conventional method, each delivery time, all user terminals all participate in scheduling.And the method according to this invention, each delivery time only has certain customers' terminal to participate in scheduling.Specifically, in the method for the invention, at first all user terminals are divided into groups, in some scheduling constantly, only have the user terminal in some group to participate in scheduling.The employing time is gone up the method for poll between group and the group, promptly according to certain sequencing, in the different scheduling moment user in is on the same group not dispatched.In addition, be variable to user's grouping, user's grouping situation difference in the different time periods.Should be noted that in the identical time period, the grouping of each user terminal is constant.As the example of user terminal, can be the portable terminal such as mobile phone, personal digital assistant, portable computer.
Below in conjunction with the description of drawings embodiments of the invention.
Fig. 2 is the structural representation of multiuser MIMO packet scheduling system according to an embodiment of the invention.Should be appreciated that the description of doing below in conjunction with accompanying drawing only is to have provided one embodiment of the present of invention for illustrative purposes, rather than limitation of the present invention.Multiuser MIMO packet scheduling system of the present invention and method are not limited to this, and those skilled in the art can make multiple change as the case may be.
As shown in Figure 2, the multiuser MIMO packet scheduling system according to the embodiment of the invention comprises base station 201 and K travelling carriage (as 211,221).Base station 201 as transmitting terminal comprises data storage cell 202, scheduling unit 203, MIMO transmitting element 204 and n
TIndividual transmitting antenna 205.In the data storage cell 202 storage wait for send to each user terminal k (k=1,2 ..., data K).Scheduling unit 203 feeds back to transmitting terminal according to receiving terminal by feedback channel 251 information is divided into groups to user terminal and is dispatched, and extracts the data of relative users terminal from the data storage cell 202 of base station 201 according to the result of scheduling.The data of being extracted offer MIMO transmitting element 204.At receiving terminal, comprised K user terminal, each user terminal k (k=1,2 ..., K) respectively comprise n
R(k) individual reception antenna 212, channel estimating unit (as 214,224), MIMO detecting unit (as 213,223) and average transmittability computing unit (as 215,225).Each user terminal utilizes channel estimating unit separately to carry out channel estimating respectively, and based on estimating the resulting current characteristic of channel, utilize average transmission ability computing unit (215,225) to calculate resulting average transmission ability thus, and feed back to transmitting terminal by feedback channel 251.MIMO detecting unit (as 213,223) carries out MIMO to the received signal and detects.
Compare with the multi-user MIMO system that adopts traditional multi-user dispatching method from the implementation structure of the multiuser MIMO packet scheduling system of present embodiment and to mainly contain following difference:
1. at receiving terminal, each user terminal inside has increased average transmission ability computing unit (215,225), and the average transmission ability that will calculate gained feeds back to transmitting terminal by feedback channel.
In the present embodiment, each user terminal calculates and the process of feeding back its average transmission ability is process when long.In other words, each user terminal calculates and feeds back the time interval of the time interval T of its average transmission ability much larger than the signal transmission.Specifically, at each moment t
0=n*T (n=0,1,2 ...), each user terminal k (k=1,2 ..., K) utilize its inner average transmission ability computing unit to calculate the past from t
0Be carved into t during-T
0Average transmission ability C when communicating by letter between base station 201 and this user terminal k in the time period constantly
k(t
0), and the result that will calculate gained feeds back to base station 201 by feedback channel 251.
As an example, each user terminal can adopt following method to calculate the average transmission ability.
Method one: will moment t
0-T is to t
0Time period in the mean value of transmission capacity as average transmittability, that is,
C (H wherein
k(t)) the expression characteristic of channel is H
k(t) the channel capacity value the time,
ρ is an average SNR.
Method two: will moment t
0-T is to t
0Time period in the mean value of characteristic of channel matrix F norm as average transmittability, promptly
F (H wherein
k(t)) the expression characteristic of channel is H
k(t) the Frobenius norm value the time, promptly
Each user terminal is at t
0=n*T calculates average transmission ability value C separately
k(t
0) afterwards, it is fed back to transmitting terminal.With in the conventional method each constantly all users all to feed back its transmittability and compare to transmitting terminal, according to of the present invention when long feedback can reduce feedback overhead.
According to the present invention, be that transmitting terminal has adopted different scheduling unit 203 with another main distinction of the multiuser MIMO dispatching patcher of prior art.The structure of scheduling unit 203 as shown in Figure 3.
Fig. 3 shows the structural representation according to the multi-user data scheduling unit 203 of the embodiment of the invention.
Below with reference to the operation of Fig. 3 description according to the scheduling unit 203 of present embodiment.As shown in Figure 3, user grouping unit 301 receives the information C of the relevant average transmission ability that each user terminal feeds back to by feedback channel 251
k(t
0) (k=1,2 ..., K), and according to the average transmission ability of each user terminal altogether K user terminal be divided into N and organize.Wherein, K is illustrated in the sum that is in the user terminal of state of activation in this sub-district, promptly wishes to carry out with the base station quantity of the user terminal of transfer of data.In real system, can discern the user terminal that is in state of activation by control channel.N represents that its concrete numerical value can be by system's initial setting according to the quantity of user's group of present embodiment division.
As previously mentioned, all user terminals are at each time interval T
0Calculate once average transmission ability separately and feed back to transmitting terminal.User grouping unit 301 also is at each time interval T
0All users are once divided into groups again.At T
0The user grouping situation remains unchanged in the time durations.In addition, after each grouping, the result notification after user grouping unit 301 also need will divide into groups by the transmission means of signaling is to each user terminal of receiving terminal.
Specifically, in the moment of carrying out user grouping, transmitting terminal can adopt diverse ways that user terminal is divided into groups.As an example, according to the present invention, can adopt the method that describes below.Be noted that to the invention is not restricted to this, also can adopt other suitable method to carry out user terminal is divided into groups.
First method is based on the group technology that fairness is optimized, and its objective is to optimize the fairness between each user terminal in the multiuser MIMO packet scheduling system.Its basic principle is to make the difference of the average transmission ability between each user terminal in each group of grouping back as much as possible little, thereby reaches the purpose that improves each user terminal fairness.For example, the difference between the average transmission ability of each user terminal in same group is divided into groups less than predetermined threshold value.Its specific descriptions are as follows.
At first, transmitting terminal is to the average transmission ability information C of all user terminal feedbacks
k(t
0) (k=1,2 ..., K) sort.Can adopt the mode of ascending order or descending to sort according to the present invention.
Suppose the sequence table after the ordering to be shown as { C by descending
K1(t
0), C
K2(t
0), C
K3(t
0), C
K4(t
0) ..., C wherein
K1(t
0) 〉=C
K2(t
0) 〉=C
K3(t
0) 〉=C
K4(t
0) 〉=....Vice versa.
Then, 301 pairs of all user terminals of user grouping module divide into groups, and can divide into groups to user terminal according to the close as far as possible mode of average transmission ability between the user terminal that makes in each grouping.Specifically, according to the resulting order of aforementioned ordering, from first user terminal k
1Beginning, adjacent K/N user terminal branch gone into one group.By grouping, group 1 can be expressed as G1={C
K1(t
0), C
K2(t
0) ..., C
K (K/N)(t
0), group 2 can be expressed as G2={C
K (K/N+1)(t
0), C
K (K/N+2)(t
0) ..., C
K (2K/N)(t
0), group 3 can be expressed as G3={C
K (2K/N+1)(t
0), C
K (2K/N+2)(t
0) ..., C
K (3K/N)(t
0), the rest may be inferred.Wherein N organizes sum for dividing later user.
The front is mentioned, and characteristics of the present invention are that all user terminals are divided into groups, and each only has the user terminal of a grouping to participate in scheduling constantly, is engraved in poll between group and the group when different.Its advantage is to reduce the feedback overhead of system and the computational complexity of scheduling effectively.Simultaneously, adopt above-mentioned group technology to all user terminal groupings the time, also having an advantage is the fairness that can improve effectively between the user.
In the traditional scheduler method, each user terminal is all wanted to compete the chance that participation is communicated by letter with all the other K-1 user terminals simultaneously, and this is inequitable often for being in remote user.For these users, its path loss is big, and the characteristic of channel is poor, with other users' competition in often be in a disadvantageous position for a long time.The method according to this invention on the one hand, is taked poll in time between packet mode and group and the group, and when the user terminal in certain grouping was dispatched, the user terminal in this group only need be competed with interior remaining K/N-1 the user of this group.Compare with conventional method, at this moment, the quantity of the user terminal that at every turn participates in the competition reduces, thereby can improve the chance that each user terminal is chosen; On the other hand, adopt this group technology to divide into groups after, therefore the characteristic of channel between the user terminal in each group is close, has the approximately equalised chance of being chosen, thereby further improves the fairness between the user.
The another kind of method of user terminal being divided into groups as the present invention is based on the optimized throughput of system.Its objective is that its basic principle is that the difference of the average transmission ability of each user terminal in making every group is big as much as possible in order to optimize the handling capacity of multi-user MIMO system integral body, thereby reach the as far as possible little purpose of loss of grouping back throughput of system.For example, difference between the average transmission ability of each user terminal in same group is in the predetermined threshold value scope divides into groups.Specifically describe as follows.
At first, first method as described above, transmitting terminal is to the average transmission ability information C of all user terminals feedbacks
k(t
0) (k=1,2 ..., K) sort.Can adopt the mode of ascending order or descending to sort according to the present invention.
As an example, suppose the sequence table after the ordering to be shown as { C by descending
K1(t
0), C
K2(t
0), C
K3(t
0), C
K4(t
0) ..., C wherein
K1(t
0) 〉=C
K2(t
0) 〉=C
K3(t
0) 〉=C
K4(t
0) 〉=....Vice versa.
Then, 301 pairs of all user grouping of user grouping module are separated every group of interior similar user of average transmission ability as much as possible.Specifically, according to top ordering gained order, from first user k
1Begin to extract, extract a user terminal every interval N.By grouping, go into one group for K/N the user terminal branch of N by sort order is adjacent.In other words, group 1 can be expressed as G1={C
K1(t
0), C
K (N+1)(t
0), C
K (2N+1)(t
0) ..., group 2 can be expressed as G2={C
K2(t
0), C
K (N+2)(t
0), C
K (2N+2)(t
0) ..., group 3 can be expressed as G3={C
K3(t
0), C
K (N+3)(t
0), C
K (2N+3)(t
0) ..., the rest may be inferred.
Compare with top group technology based on fairness optimization, second method has been sacrificed the raising that fairness between the user exchanges the entire system handling capacity for.Still has simultaneously low feedback overhead, the characteristics of low scheduling complexity.
The interior scheduling unit 302 of the group that comprises in the scheduling unit 203 in the base station 201 is dispatched according to the transmission data of the user grouping time ordered pair user terminal that user grouping unit 301 provides.
With regard to dispatching algorithm, scheduling unit 302 can adopt any traditional dispatching method in the group, for example based on the method for time-division, and the pretreated method of transmitting terminal ZF, or the like.The difference of the present invention and traditional scheduler method is: (a) each scheduling only has some group of interior user terminal to participate in scheduling constantly; (b) adopt the mode of poll in time between group and the group.
Specify its scheduling process below.For example, in the scheduling moment 1, the user terminal in the group 1 participates in scheduling; In the scheduling moment 2, the user terminals in the group 2 participate in scheduling; ...; At scheduling moment N, the user in the group N participates in scheduling; At scheduling moment N+1, the user terminal in the group 1 participates in scheduling; At scheduling moment N+2, the user terminals in the group 2 participate in scheduling; The rest may be inferred.In addition, scheduling unit 302 can be notified to the receiving terminal relevant user terminals by forward signaling channel with the final result after the scheduling in the group.
After the processing through scheduling unit 302 in user grouping unit 301 and the group, determined each transmitting antenna 1,2 ..., n
TPairing reception user terminal { k
1, k
2..., k
NT.Next, extract data cell 303
Extract corresponding data to be sent according to the data storage cell 202 of this determined result from base station 201, that is, will send to user terminal k for antenna 1 extracts
1Data, to send to user terminal k for antenna 2 extracts
2Data, the rest may be inferred.At last the data that will send are input to MIMO transmitting element 204 in this time interval, and send by antenna 205.
Fig. 4 shows the flow chart that a plurality of user terminals is carried out the method for packet scheduling according to the embodiment of the invention.Below in conjunction with the embodiment of Fig. 4 description according to multi-user's grouping scheduling method of the present invention.
Comprised a base station 201 and K travelling carriage (211,221) in the down link of multiuser MIMO packet scheduling system, wherein base station 201 comprises n
TIndividual transmitting antenna, each travelling carriage (user terminal) k (k=1,2 ..., K) comprise n
R(k) individual reception antenna.Grouping scheduling method of the present invention begins at step S401, each user terminal k of receiving terminal (k=1,2 ..., K) calculate at current time t
0With moment t
0Average transmission ability C in the time interval between the-T between base station 201 and this user terminal k
k(t
0), and the result that will calculate feeds back to transmitting terminal by feedback channel.Next, at step S402, base station 201 is divided into the N group according to each user's who feeds back from travelling carriage average transmission ability with all user terminals, and note is made G
1, G
2..., G
NAt this, each user terminal can adopt based on the method for average size or based on the method for mean F norm value and calculate its average transmission ability, and concrete operations as previously mentioned.In step S402, the operation of multiple users grouping to be carried out once every the preset time interval T, the big I of T is by system's initial setting.According to the present invention, can adopt the group technology of optimizing based on fairness, or based on the group technology of handling up and optimizing.Its concrete operations as previously mentioned.
Next,, n=1 is set, with the user terminal of selecting first group will dispatch at step S403.After this, at step S404, according to group G
nThe characteristic of channel that interior user terminal is current is to group G
nInterior user terminal is dispatched.Behind the scheduling operation of the user terminal in finishing a group, at step S405, the user terminal of selecting next group to dispatch promptly is provided with n=n+1.After this, flow process proceeds to step S406, determines whether and need divide into groups again to user terminal.If do not need user terminal is divided into groups again, flow process turns back to step S404, continues the user terminal in the next one grouping is carried out scheduling operation.
If determine and to divide into groups again to user terminal that flow process is then returned step S402 at step S406 transmitting terminal, user terminal is divided into groups again according to the average transmission ability in the next time interval of receiving terminal feedback user terminal.Again the packet scheduling process of foregoing description is carried out in the grouping back.
The front illustrates that the operation that the multi-user is divided into groups is that each time interval T carries out once.When at t
0=n*T (n=0,1,2 ...) constantly transmitting terminal finish after the grouping to user terminal, obtain group result G
1, G
2..., G
N(t afterwards
0, t
0+ T) in the time period, make a start at each delivery time, successively to each group G
1, G
2..., G
NIn the user dispatch.That is to say that the user in each scheduling only has some group constantly participates in scheduling, adopts the mode of poll in time between group and the group.To the group G
n(n=1,2 ..., N) user terminal in carries out in the scheduling process, can adopt any traditional dispatching method, for example based on the method for time-division, and the pretreated method of the ZF of making a start, or the like.The process that participates in scheduling in turn between group and the group will constantly be carried out, and up to next one grouping constantly, promptly (n+1) * T constantly.At this moment, then forward step S402 to, carry out operation again user grouping.
Fig. 5 shows the emulation contrast schematic diagram of the fairness performance of method of the present invention and art methods.Fig. 6 shows the emulation contrast schematic diagram of the volumetric properties of method of the present invention and art methods.
The quantity of the transmitting antenna that adopts in the emulation is n
T=4, the quantity of reception antenna is n
R(k)=2, k=1,2 ..., K.Channel has adopted flat fading channel, and the average received signal to noise ratio of cell edge is 0dB, path loss factor-alpha=3, and the sum of the user terminal grouping of division is N=5.
Fig. 5 is a fairness property comparison schematic diagram, and the longitudinal axis is represented the probability that the user nearest apart from the base station chosen in scheduling, and transverse axis is represented the quantity of user terminal.As shown in Figure 5, the fairness performance of utilizing the curve representation of asterisk mark to adopt conventional method to obtain; Utilize the curve of circles mark to represent according to the present invention the fairness performance that the group technology of optimizing based on handling up obtains; With the representative of the curve of triangular marker according to the present invention, the fairness performance that obtains based on the group technology of fairness optimization.From Fig. 5 as seen, employing the inventive method can also improve the fairness of each user terminal in the scheduling greatly, and is all the more so when especially adopting the group technology of optimizing based on fairness.The raising that is appreciated that fairness between the user will inevitably bring the loss of power system capacity.
Fig. 6 is a power system capacity property comparison schematic diagram, and the longitudinal axis is represented power system capacity, and transverse axis is represented the quantity of user terminal.As shown in Figure 6, the power system capacity performance of utilizing the curve representation of asterisk mark to adopt conventional method to obtain; Utilize the curve of circles mark to represent according to the present invention the power system capacity performance that the group technology of optimizing based on handling up obtains; With the representative of the curve of triangular marker according to the present invention, the power system capacity performance that obtains based on the group technology of fairness optimization.As seen from Figure 6,, can reduce the loss of volumetric properties as much as possible if adopt the group technology of optimizing based on handling up, more all the more so at number of users.
As previously mentioned, compare with conventional method, the inventive method can reduce the implementation complexity of multi-subscriber dispatching algorithm effectively, and (computational complexity is kept to original 1/f (N), wherein f () is multinomial or exponential function, concrete relevant with the dispatching algorithm that is adopted), and the feedback overhead of system (being reduced to original 1/N doubly).In addition, the inventive method also has very strong flexibility, and choose (group technology, the group number or the like) by parameter can obtain trading off between different feedback overheads, complexity, throughput performance and the fairness.
At last, need to prove, above described in the embodiment be the implementation method of method of the present invention in the mimo system of single carrier, no spread spectrum.In fact, the multi-user dispatching method that the present invention proposes can also be applicable to other mimo systems except the mimo system that can be used for single carrier, no spread spectrum, such as the MIMO-OFDM system, and the mimo system that adopts spread spectrum.
Should be appreciated that the difference of MIMO-OFDM system and single carrier mimo system is: increased the one dimension territory in the transmission of signal, promptly frequency domain promptly adopts a plurality of subcarriers to carry out the transmission of signal simultaneously.In MIMO-OFDM, the signal in the frequency domain on each subcarrier can not produce interference between mutually, so the MIMO-OFDM system can be counted as N parallel single carrier mimo system, and N is the sum of subcarrier.So the inventive method can also easily be applied to the MIMO-OFDM system.
In addition, for the spread spectrum mimo system, it is compared with non-spread spectrum mimo system, and difference is: increased the one dimension territory in the transmission of signal, promptly the sign indicating number territory promptly adopts a plurality of orthogonal codes to carry out the transmission of signal simultaneously.In spread spectrum MIMO, owing to generally be quadrature between each yard that adopts, so the spread spectrum mimo system also can be counted as N parallel non-spread spectrum mimo system, N by the sum of employing spreading code.Equally, method of the present invention can also be conveniently used in the spread spectrum mimo system.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (19)
1. the grouping scheduling method in the multi-antenna multi-user wireless communication system comprises step:
Calculate the user terminal interior average transmission ability of predetermined time interval in the past;
According to the user terminal average transmission ability of calculating user terminal is divided into groups;
During each transmitting time, only the user terminal in the grouping is dispatched; With
According to the transmitting time order, successively the user terminal in the follow-up grouping is dispatched.
2. method according to claim 1 is wherein carried out once in each time interval the step that all user terminals divide into groups, at the same time at interval in the packet conditions of user terminal remain unchanged.
3. method according to claim 1, wherein calculate user terminal in the past the step of the average transmission ability in the predetermined time interval comprise and calculate the step of the transmission capacity mean value of described user terminal in described predetermined time interval as the average transmission ability of described user terminal.
4. method according to claim 1, wherein calculate user terminal in the past the step of the average transmission ability in the predetermined time interval comprise the mean value that calculates the characteristic of channel matrix F norm of described user terminal in described predetermined time interval step as the average transmission ability.
5. method according to claim 1, wherein the step that user terminal is divided into groups so that in each group of grouping back the as much as possible little mode of difference of the average transmission ability between each user terminal user terminal is divided into groups.
6. method according to claim 1, wherein the step that user terminal is divided into groups so that in each group of grouping back the big as much as possible mode of difference of the average transmission ability between each user terminal user terminal is divided into groups.
7. method according to claim 1 further comprises determining whether the step that need divide into groups again to user terminal.
8. method according to claim 1, wherein the step that user terminal is divided into groups comprises that further the user terminal average transmission ability according to calculating sorts to user terminal, and adjacent K/N user terminal branch gone into one group step, wherein K represents the quantity of user terminal, and N represents the group number of the user terminal that divides into groups.
9. the grouping scheduling method in the multi-antenna multi-user wireless communication system comprises step:
Average transmission ability in the predetermined time interval in the past between each calculation base station in a plurality of travelling carriages and described each travelling carriage;
Divide into groups to described a plurality of travelling carriages according to the described average transmission ability of calculating in the base station; With
According to time sequencing, dispatch the travelling carriage in each grouping during each transmitting time successively the base station,
Wherein during a transmitting time, only the travelling carriage in the grouping is dispatched.
10. method according to claim 9 further comprises from described travelling carriage step of the average transmission ability in the predetermined time interval in the past between described base station that described base station feedback is calculated and described each travelling carriage.
11. method according to claim 9 is wherein carried out once in each predetermined time interval the step that each travelling carriage divides into groups, at the same time at interval in the packet conditions of described travelling carriage remain unchanged.
12. method according to claim 9, the step of wherein calculating described average transmission ability comprises that the transmission capacity mean value in described predetermined time interval is as the step of described average transmission ability between each that calculate in described base station and the described a plurality of travelling carriage.
13. method according to claim 9, the step of wherein calculating described average transmission ability comprises the step of the mean value of the characteristic of channel matrix F norm in described predetermined time interval between each that calculate in described base station and the described a plurality of travelling carriage as described average transmission ability.
14. method according to claim 9, wherein the step that a plurality of travelling carriages are divided into groups so that the mode that the difference of the described average transmission ability between each travelling carriage and the described base station is as much as possible little in each group of grouping back described a plurality of travelling carriages are divided into groups.
15. method according to claim 9, wherein the step that a plurality of travelling carriages are divided into groups so that the mode that the difference of the described average transmission ability between each travelling carriage and the described base station is big as much as possible in each group of grouping back described a plurality of travelling carriages are divided into groups.
16. method according to claim 9 comprises that further described base station determines whether the step that need divide into groups again to described a plurality of travelling carriages.
17. method according to claim 9, wherein the step of described a plurality of travelling carriages grouping is further comprised according to described base station of calculating and the described average transmission ability between described each travelling carriage described a plurality of travelling carriages are sorted, and adjacent K/N travelling carriage branch gone into one group step, wherein K represents the quantity of user terminal, and N represents the group number of the user terminal that divides into groups.
18. the packet scheduling system in the multi-antenna multi-user wireless communication system comprises:
The base station has:
Data storage cell is used to store the data that wait sends to each travelling carriage;
Scheduling unit is used for travelling carriage is divided into groups and dispatching according to the travelling carriage feedack, and extracts the data that will send to corresponding travelling carriage according to the result of grouping and scheduling from data storage cell;
Many antenna transmission unit is used for the data conversion that scheduling unit provides is become parallel data stream, the corresponding transmitting antenna of each substream of data,
A plurality of travelling carriages, each travelling carriage has:
Channel estimating unit is used to estimate the characteristic of channel between base station and the corresponding travelling carriage;
Average transmission ability computing unit is used for according to the described characteristic of channel of estimating, the average transmission ability between calculation base station and the corresponding travelling carriage,
Many antenna detection unit is used for carrying out to the received signal many antenna detection,
Wherein the described average transmission ability of Ji Suaning is fed back to the base station.
19. packet scheduling system according to claim 18, wherein said scheduling unit comprises:
The user grouping unit is used for the described average transmission ability information according to each travelling carriage of feedback, and described a plurality of travelling carriages are divided into a plurality of groupings;
The travelling carriage group result that provides according to the user grouping unit is provided scheduling unit in the group, dispatches the transmission data of the travelling carriage in each grouping;
Extract data cell, extract corresponding data to be sent according to user grouping unit group result that provides and the scheduling result that the interior scheduling unit of group provides from data storage cell, and offer corresponding transmitting antenna.
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| CNA2006100597855A CN101034923A (en) | 2006-03-07 | 2006-03-07 | Packet scheduling method and system for multi-antenna radio communication system |
| PCT/JP2007/054443 WO2007102546A1 (en) | 2006-03-07 | 2007-03-07 | Wireless communication device and scheduling method |
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| CNA2006100597855A CN101034923A (en) | 2006-03-07 | 2006-03-07 | Packet scheduling method and system for multi-antenna radio communication system |
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| WO (1) | WO2007102546A1 (en) |
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