CN101577940B - Method for dispatching user facility of distributed antenna system - Google Patents
Method for dispatching user facility of distributed antenna system Download PDFInfo
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Abstract
The invention relates to a method for dispatching a user facility of a distributed antenna system, comprising the following steps: a) a UE radio of the user facility coordinates with a multipoint CoMPto establish request information; b) antennae receiving the request information transmit information such as UE link channel quality, QoS requirements and usable coordinated frequency spectrum of the antennae to a base station terminal; c) the base station calculates level of overall service qualify (QoS) standard according to the link channel quality and establishes a CoMP antenna cluster for th e UE by combining the QoS requirements and usable coordinated frequency spectrum of the antennae. The method of the invention can realize initialization of a CoMP mechanism of the user facility.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to a kind of method for dispatching user facility of distributing antenna system.
Background technology
CoMP (Coordinated multiple point, collaborative multiple spot) is that the LTE-Advanced system enlarges the network edge covering, guarantees one of important technology of edge customer QoS, is the exclusive technology of LTE-Advanced system.In the LTE-Advanced system, CoMP comprises two kinds of scenes: cooperation between base stations and distributing antenna system.From data flow always, CoMP can be divided into descending transmission CoMP and up reception CoMP again.Descending transmission CoMP comprises two class technology: cooperative scheduling and beam shaping, Combined Treatment and transmission.And for up reception CoMP, then have only to unite to receive and a kind of technology of processing.
Between antenna the up-downgoing CoMP schematic diagram of cooperation scene as shown in Figure 1, UE communicates by letter with base station (eNB) by main and auxiliary antenna is collaborative.Obviously, for each UE (User Equipment, subscriber equipment), no matter be up link CoMP or down link CoMP, all need a plurality of antennas to participate in, with the VC (Virtual Cell, virtual subdistrict) that constitutes this UE.Like this, thus how select antenna to realize that normally enabling of corresponding CoMP mechanism is most important to each UE.
On the other hand, when a plurality of UE CoMP participating, CoMP mechanism is enabled when how to take into account between a plurality of UE, and the resource utilization and the throughput that improve network system also are problem demanding prompt solutions.
Therefore, need the scheduling scheme that proposes a kind of UE at present badly and solve prior art problems.
Summary of the invention
Purpose of the present invention is intended to one of solve the aforementioned problems in the prior at least.
For this reason, a kind of corresponding each antenna of subscriber equipment of can realizing of embodiments of the invention proposition carries out the method for dispatching user facility of multipoint cooperative.
According to embodiments of the invention, a kind of method for dispatching user facility has been proposed, said method comprising the steps of: a) the collaborative multiple spot CoMP of user equipment (UE) broadcasting sets up solicited message; B) receive each antenna of described request information link channel quality, QoS demand and the antenna of described UE can be sent to the base station end with information such as collaboration frequency spectrums; C) base station is according to the overall quality of service QoS level of the described UE of described link channel Mass Calculation, and can be that described UE sets up the CoMP cluster of antennas with collaboration frequency spectrum in conjunction with described QoS demand and described antenna.
The further embodiment according to the present invention, described step c may further comprise the steps: the main antenna of described UE is added in the described CoMP cluster of antennas; Whether the QoS level of judging described UE reaches described QoS demand, and whether the antenna of each auxilliary combination of antennas correspondence can exist common frequency spectrum with described main antenna with collaboration frequency spectrum; And described QoS level reached described QoS demand and exist the corresponding auxilliary combination of antennas of common frequency spectrum to add in the described CoMP cluster of antennas with described main antenna.
According to the present invention again one the step embodiment, when all there is not common frequency spectrum in described each auxilliary combination of antennas with described main antenna, with described QoS level reach described QoS demand and between exist the auxilliary combination of antennas of correspondence of common frequency spectrum to add in the described CoMP cluster of antennas.
According to the present invention again one the step embodiment, when described QoS level does not reach described QoS demand, select the combination of antennas of the highest QoS level correspondence to add in the described CoMP cluster of antennas, and can carry out spectrum allocation may to described combination of antennas with collaboration frequency spectrum in conjunction with described antenna.
The embodiment in a step again according to the present invention, when having a plurality of described UE, described step c also comprises the further whether independent step of described common frequency spectrum of judging.If during described common frequency spectrum independence, the auxilliary combination of antennas of correspondence is added in the described CoMP cluster of antennas, from described CoMP cluster of antennas, select an auxilliary antenna sets to merge and can carry out spectrum allocation may with collaboration frequency spectrum in conjunction with described antenna.If it is described common frequency spectrum not only immediately, then that the auxilliary combination of antennas adding CoMP of correspondence is alternative concentrated.And add the CoMP cluster of antennas of described UE from auxilliary combination of antennas of the alternative concentrated selection of described CoMP
The further embodiment according to the present invention is that described UE sets up the CoMP cluster of antennas and distributes frequency spectrum according to the auxilliary antenna amount order from less to more of each described UE correspondence.
The present invention can be in conjunction with the QoS level of subscriber equipment and the common frequency spectrum analysis between the respective antenna combination, and the CoMP mechanism that is implemented in UE in the distributing antenna system is normally enabled.
Especially, when a plurality of UE under being in the covering of same base station needed to enable CoMP mechanism simultaneously, the present invention can realize the CoMP antenna assignment of a plurality of UE and corresponding wireless frequency spectrum division carrying out combined dispatching and processing.Therefore, guaranteeing to improve the utilance and the power system capacity of frequency spectrum resource greatly under the normal prerequisite of using of multipoint cooperative mechanism, increase the network entire throughput.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the uplink and downlink CoMP schematic diagram in when cooperation between antenna;
Fig. 2 is the method for dispatching user facility overview flow chart of the embodiment of the invention;
Fig. 3 is the auxilliary combination of antennas schematic diagram of the UE correspondence of the embodiment of the invention;
Fig. 4 is the collaborative multiple spot spectrum allocation may schematic diagrames of many UE of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the present invention, and can not be interpreted as limitation of the present invention.
The method for dispatching user facility of distributing antenna system of the present invention is at collaborative multiple spot (CoMP) technology, for the subscriber equipment under the distributing antenna system is selected corresponding C oMP antenna, start CoMP mechanism, realize the communication scheduling between subscriber equipment and the base station.
With reference to figure 2, the figure illustrates the method for dispatching user facility overall procedure of the embodiment of the invention.Here, for clear elaboration the present invention, only provided the collaborative day line options that starts CoMP mechanism about a subscriber equipment among this embodiment.Certainly, other subscriber equipmenies that need start CoMP mechanism all can profit carry out corresponding antenna selection scheduling in the following method.
When subscriber equipment (UE) 12 needs to start CoMP mechanism, at first broadcast CoMP and set up solicited message.CoMP sets up service quality (QoS) the demand Q that can comprise UE 12 identifiers (UE_ID), UE in the solicited message
TiMain antenna ID with UE 12.Generally speaking, selecting the access antenna of UE12 is main antenna.
Comprise Q in the CoMP solicited message
TiInformation is because of the difference owing to customer service, and the QoS demand that different UEs needs is also different.Make Q
TiThe QoS demand of expression subscriber equipment i, Q
iExpression subscriber equipment i can reach overall QoS level when using several antennas to carry out CoMP, therefore should satisfy Q
i〉=Q
TiThe QoS demand can be with any parameter characterization relevant with channel, for example E
b/ I
0Value does not specify herein, only generally represents with Q.
When the present invention works in coordination with the scheduling of day line options for UE 12, need it to satisfy qos requirement, thereby improve corresponding C oMP throughput.
After UE 12 broadcasts, its main antenna 16 and some auxilliary antennas thereof, promptly emergency antenna receives this broadcast.Here these auxilliary antennas of antenna 14 expression UE 12 correspondences can be one or more according to practical application.
Here, for senior Long Term Evolution (LTE-Advanced) distributing antenna system, its scheduling scheme comprises up reception antenna selection and descending transmitting antenna is selected two kinds of situations.
After receiving above-mentioned solicited message,, then trigger the channel quality that respective antenna 14 and main antenna 16 are measured its up link for up reception antenna.Then, each day alignment base station 18 send CoMP and join request, thereby respectively with the QoS demand Q of UE_ID, UE 12
Ti, main antenna ID, uplink channel quality and each antenna information such as available CoMP frequency spectrum to be sent to base station 18 medium pending.
For descending reception antenna, when UE 12 planned to start CoMP mechanism, at first the pilot signal of reception antenna 14 and main antenna 16 measured corresponding downlink channel quality then.In this case, the CoMP of UE 12 broadcasting sets up and also comprises its downlink channel quality in the solicited message, and by each antenna transmission to base station 18.
Below, will set up in conjunction with the CoMP cluster of antennas of UE 12 and provide detailed description.
As indicated above, UE 12 need satisfy Q when using several antennas to carry out CoMP
i〉=Q
Ti
In addition, antenna in the same virtual subdistrict of correspondence (VC) should use same frequency so that cooperate, and in the system that uses the frequency division multiple access technology, for example senior Long Term Evolution (LTE-Advanced) system, then need to seek a public CoMP frequency range, to guarantee the normal use of CoMP for the antenna among the same VC.
Therefore, remove selected cooperation cluster of antennas and satisfy Q
i〉=Q
TiOutside the requirement, also having considered in the following embodiments needs to have public CoMP frequency range between these antenna.Specify as follows.
Here, suppose that UE 12 has a main antenna 16 and at least one alternative auxilliary antenna 14, these antenna can make up and obtain the respective amount cluster of antennas, and wherein the antenna that comprises of each cluster of antennas is the antenna that can start UE 12 CoMP mechanism.
In one embodiment, main antenna 16 must add in the CoMP cluster of antennas of UE 12.Therefore base station 18 only needs which auxilliary antenna of decision can add in this cluster of antennas when setting up the CoMP cluster of antennas of UE 12 now.
About the UE correspondence auxilliary combination of antennas embodiment as shown in Figure 3, UE has 4 available secondary antennas in this exemplary plot, the much more parallel fork numerical tables of its all possible combination of antennas such as figure show.
If the QoS level reaches the QoS demand and has common frequency spectrum with main antenna 16, then Dui Ying auxilliary combination of antennas meets the demands, and can add in the CoMP cluster of antennas.That is to say not have the antenna of common frequency spectrum to leave out with its main antenna in the CoMP antenna Candidate Set.In addition, the antenna that the CoMP frequency spectrum is exhausted is also left out.
If all there is not common frequency spectrum in each auxilliary combination of antennas of UE 12 with main antenna, but in fact, surely exists between the auxilliary antenna and can satisfy the combination of antennas that qos requirement has common frequency spectrum again.Therefore, in one embodiment, in this case can with satisfy above-mentioned QoS demand and between exist the auxilliary combination of antennas of correspondence of common frequency spectrum to add in the CoMP cluster of antennas.
In one embodiment, if judge when the QoS level of UE 12 each auxilliary combination of antennas does not reach the QoS demand, can abandon UE 12 and use CoMP mechanism.Also can select the combination of antennas of the highest QoS level correspondence to add in the CoMP cluster of antennas.In this case, though still do not reach the qos requirement of UE 12, may improve data rate.
In the CoMP cluster of antennas that obtains at above-mentioned various situations, may have the combination of antennas of the CoMP mechanism of a plurality of satisfied startup UE 12, promptly satisfy the QoS demand and between have public CoMP frequency spectrum.Therefore, an auxilliary combination of antennas can therefrom be selected in base station 18, and can carry out the collaboration frequency spectrum distribution with collaboration frequency spectrum in conjunction with the antenna of selected auxilliary combination of antennas.Base station 18 will be notified to main antenna 16 and corresponding auxilliary antenna 14 about sky line options and the distribution frequency spectrum of CoMP.Then, send the cooperation response message to UE 12, notify its collaboration frequency spectrum by main antenna 16.
Only provide the scheduling scheme of sole user's CoMP days line options and spectrum allocation may above, can have the situation of a plurality of UE CoMP participatings at real system.Therefore, hereinafter will describe the combined dispatching scheme of each subscriber equipment in detail at enabling CoMP mechanism between a plurality of UE simultaneously.
By the mode that above-mentioned Fig. 2 shows, each UE can respectively that it is corresponding CoMP sets up relevant information and focuses on the base station end, and sets up its corresponding C oMP cluster of antennas respectively by the base station.But,, take conflict because the frequency spectrum of determining between the different UE may exist for fdma system.
The antenna of for example supposing the CoMP cluster of antennas correspondence of UE1 is that { 1,2,3}, antenna 1 are its main antennas; The antenna of the CoMP cluster of antennas correspondence of UE2 is that { 2,3,4}, antenna 4 are its main antennas.Suppose that antenna 1 is cooperated with 2 or 1 cooperate with 3 and can guarantee the qos requirement of UE1 that antenna 2 and 4 cooperations can guarantee the QoS demand of UE2.If select antenna 1 to cooperate with 2 for UE1, spectral coverage 3 will be used, and UE2 can't start CoMP mechanism this moment, because UE2 can only use spectral coverage 3 cooperations, and this spectral coverage has been taken by UE1.
Therefore, the base station need be taken into account other UE and carry out combined dispatching when single UE is set up cluster of antennas and distributes frequency spectrum.
Each UE is being set up in the cluster of antennas, and the base station can judge further whether the common frequency spectrum of corresponding auxilliary combination of antennas correspondence is independent.So-called frequency spectrum is independently/independent, is meant whether this spectral coverage may be used by more than one UE.
For example shown in Fig. 4 embodiment, the spectral coverage 3 of antenna 2 both may also may be used by UE2 by UE1, so this frequency spectrum is not independent; 2 of the spectral coverages of antenna 3 may be used by UE1, so this spectral coverage is independent.
When each UE that sets up the CoMP cluster of antennas for request carried out day line options and spectrum allocation may, the base station can according to how many orderings of the alternative auxilliary number of antennas of all UE.The UE that priority treatment alternative antenna number is few, the UE that reprocessing alternative antenna number is many.
If when judging common frequency spectrum independence, the base station then adds the auxilliary combination of antennas of correspondence in the CoMP cluster of antennas.From this CoMP cluster of antennas, select an auxilliary combination of antennas then, and can carry out spectrum allocation may with collaboration frequency spectrum in conjunction with its respective antenna.
At common frequency spectrum not only immediately, then that the auxilliary combination of antennas adding CoMP of correspondence is alternative concentrated.If all there is not independently common frequency spectrum in all auxilliary combination of antennas of corresponding UE, then add the CoMP cluster of antennas from auxilliary combination of antennas of the alternative concentrated selection of CoMP.And the corresponding antenna of combination can be that this auxiliary antenna combination distributes frequency spectrum with collaboration frequency spectrum.If have an independently common frequency spectrum, then do not consider alternative combination of antennas.
In one embodiment, the base station can comprise the table 1 of following form, judges whether that being operated in the data preliminary treatment before the combined dispatching of separate spectrum finish, and data also are stored in the following table, directly searches during use to get final product.
Table 1
| Antenna ID | Residue CoMP frequency spectrum | UE | Up Q i | The spectral coverage that may use (comparing) with main antenna | Independent spectral coverage |
At the combined dispatching between above-mentioned single UE days line options and spectrum allocation may and the many UE, embodiments of the invention have provided a kind of combined dispatching algorithm.
In this embodiment, for all UE, according to how many orderings of alternative antenna number.Handle the few UE of alternative antenna number earlier, the UE that reprocessing alternative antenna number is many.
For user i, its main antenna will be selected in the CoMP cluster of antennas of i, and supposes that user i has n alternative auxilliary antenna, makes k=1 represent to consider to use the situation of an auxilliary antenna.
Circulation 1:
1) k all possible combination of auxilliary antenna is recorded in B[C
n k] in [k], and press Q
iThe size descending.B[j] j combination of antennas of expression consideration, make j=1.If variable m=0.Circulation 2:
I) if Q
i〉=Q
TiAnd B[j] there is common frequency spectrum with main antenna, then make m=m+1.Judge:
A) if common frequency spectrum is independent, then with B[j] elect the CoMP cluster of antennas of user i and end loop 1 as;
B) if common frequency spectrum is independent, then with B[j] the alternative collection of adding CoMP CoMP_SET.At this moment, if
Then from CoMP_SET, select a CoMP cluster of antennas as user i, and end loop 1.
Ii) if Q
i＜Q
Ti, then go to 2) and (end loop 2 is returned circulation 1);
Iii) if
Then j=j+1 returns circulation 2.
2) if k＜n, k=k+1 then, m=0 returns circulation 1; Otherwise, end loop 1.
, then judge if do not select the CoMP cluster of antennas by above-mentioned algorithm:
1) if CoMP_SET is not empty, then from wherein selecting a CoMP cluster of antennas as user i;
2) if CoMP_SET is empty,, can not use CoMP mechanism even show the qos requirement of using all auxilliary antennas also not reach user i.
It should be noted that in the above-mentioned algorithm that this algorithm carries out at single UE, the result takes into account other according to predefined procedure to have determined UE, selects this user's cooperation antenna and employed CoMP frequency spectrum.For next user, need re-execute above-mentioned algorithm.
In addition, in above-mentioned algorithm steps, the possible combination of antennas that need investigate when using k auxilliary antenna can be optimized, and need not to travel through all possible combination of antennas.For example shown in Figure 3, suppose to have 4 antennas available, all possible combination is as shown in the figure.Therefore suppose that { 1,2} does not have common frequency spectrum to combination of antennas, and then { 1,2,3}, { 1,2,4}, { 1,2,3,4} then must not have common frequency spectrum to combination of antennas yet, all can not need consider, needs the combination of antennas number investigated thereby reduce.
In above-mentioned algorithm steps, what is called " main antenna will be selected in the CoMP cluster of antennas of i " not necessarily.Only need that the main antenna in the above-mentioned algorithm is also added follow-up combination of antennas and get final product, obtain between the auxilliary antenna and can satisfy the combination of antennas that qos requirement has common frequency spectrum again.Originally compared, this moment, possible combination of antennas number will increase.
Scheduling scheme of the present invention is applicable to the distributing antenna system in the various radio communications, and for the LTE-Advanced distributing antenna system, its scheduling scheme comprises up reception antenna selection and descending transmitting antenna is selected two kinds of situations.
Disclosed in this inventionly have the following advantages based on the sky line options of base station and the dispatching user facility scheme of spectrum allocation may:
The first, in distributing antenna system, the present invention can realize that the CoMP mechanism of UE enables.Especially, when a plurality of UE under being in the covering of same base station need to enable CoMP mechanism simultaneously, CoMP antenna assignment and corresponding wireless frequency spectrum division carry out combined dispatching and the processing of suitable algorithm to a plurality of UE taked in the base station, guaranteeing to improve the utilance and the power system capacity of frequency spectrum resource greatly under the normal prerequisite of using of multipoint cooperative mechanism.Thereby when guaranteeing the normal foundation of virtual subdistrict, guarantee that user as much as possible inserts, and increases the grid entire throughput.
Second, the antenna selection course of this programme is finished on the base station, with reference to UE client information (being included among the CoMP_Build_Req), therefore this programme is a kind of UE, base stations united antenna selection strategy in itself, and more information helps selecting better antenna when taking into account the entire system performance.
The 3rd, the work of CoMP days line options has been transferred on the base station, thereby simplified the design that UE holds, and the energy expense of saving the UE end.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification that scope of the present invention is by claims and be equal to and limit to these embodiment.
Claims (9)
1. the method for dispatching user facility of a distributing antenna system said method comprising the steps of:
A) the collaborative multiple spot CoMP of user equipment (UE) broadcasting sets up solicited message;
B) receive each antenna of described request information link channel quality, QoS demand and the antenna of described UE can be sent to the base station end with information such as collaboration frequency spectrums;
C) base station is according to the overall quality of service QoS level of the described UE of described link channel Mass Calculation, and can be that described UE sets up the CoMP cluster of antennas with collaboration frequency spectrum in conjunction with described QoS demand and described antenna;
It is characterized in that described step c may further comprise the steps:
The main antenna of described UE is added in the described CoMP cluster of antennas;
Whether the QoS level of judging described UE reaches described QoS demand, and whether the antenna of each auxilliary combination of antennas correspondence can exist common frequency spectrum with described main antenna with collaboration frequency spectrum; And
Described QoS level is reached described QoS demand and exists the corresponding auxilliary combination of antennas of common frequency spectrum to add in the described CoMP cluster of antennas with described main antenna.
2. the method for claim 1, it is characterized in that, when all there is not common frequency spectrum in described each auxilliary combination of antennas with described main antenna, with described QoS level reach described QoS demand and between exist the auxilliary combination of antennas of correspondence of common frequency spectrum to add in the described CoMP cluster of antennas.
3. the method for claim 1, it is characterized in that, when described QoS level does not reach described QoS demand, select the combination of antennas of the highest QoS level correspondence to add in the described CoMP cluster of antennas, and can carry out spectrum allocation may to described combination of antennas with collaboration frequency spectrum in conjunction with described antenna.
4. method as claimed in claim 1 or 2 is characterized in that, when having a plurality of described UE, described step c also comprises the further whether independent step of described common frequency spectrum of judging.
5. method as claimed in claim 4 is characterized in that,
When described common frequency spectrum independence, the auxilliary combination of antennas of correspondence is added in the described CoMP cluster of antennas, from described CoMP cluster of antennas, select an auxilliary antenna sets to merge and can carry out spectrum allocation may with collaboration frequency spectrum in conjunction with described antenna;
At described common frequency spectrum not only immediately, then that the auxilliary combination of antennas adding CoMP of correspondence is alternative concentrated.
6. method as claimed in claim 5 is characterized in that, adds the CoMP cluster of antennas of described UE from auxilliary combination of antennas of the alternative concentrated selection of described CoMP, and can be that described auxilliary combination of antennas is distributed frequency spectrum with collaboration frequency spectrum in conjunction with described antenna.
7. method as claimed in claim 1 or 2 is characterized in that, comprises that also selecting an auxilliary antenna sets to merge from described CoMP cluster of antennas can carry out spectrum allocation may with collaboration frequency spectrum in conjunction with described antenna.
8. method as claimed in claim 4 is characterized in that, is that described UE sets up the CoMP cluster of antennas and distributes frequency spectrum according to the auxilliary antenna amount order from less to more of each described UE correspondence.
9. the method for claim 1 is characterized in that,
When described CoMP cluster of antennas was up reception antenna, described link channel quality was obtained by the up link of each antenna measurement correspondence that receives described request information;
When described CoMP cluster of antennas was descending transmitting antenna, described link channel quality was by described UE reception antenna pilot frequency information and measure corresponding down link acquisition.
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| CN102104970B (en) * | 2009-12-18 | 2014-04-09 | 中兴通讯股份有限公司 | Method, device and system for coordinately scheduling among cells |
| CN102340888A (en) * | 2010-07-23 | 2012-02-01 | 中兴通讯股份有限公司 | Multi-base-station collaboration method and system, mobile terminal and main service base station |
| CN101902260B (en) * | 2010-07-27 | 2013-01-23 | 华为技术有限公司 | Cooperative antenna selection method and device and base station thereof |
| CN102647750B (en) * | 2011-02-11 | 2015-05-13 | 中兴通讯股份有限公司 | Method, system and device for starting and closing CoMP (Cooperative Multi-Point) transmission mode |
| CN102655677B (en) | 2011-03-02 | 2015-04-01 | 株式会社日立制作所 | Mobile communication system and far-end radio frequency unit clustering method thereof |
| CN102684758B (en) * | 2011-03-09 | 2014-07-16 | 华为技术有限公司 | Method and device for dispatching terminals in system of multi-antenna-unit shared cell |
| CN105355947B (en) * | 2015-11-25 | 2017-08-15 | 山东理工大学 | The method that 3 D-printing has stereo channel honeycomb type solid oxide fuel cell |
| CN105500493B (en) * | 2015-11-25 | 2017-08-25 | 山东理工大学 | The method that 3 D-printing has the honeycomb type electro-catalytic membrane reactor of stereo channel |
| CN105472750B (en) * | 2015-12-08 | 2018-12-14 | 江苏鑫软图无线技术股份有限公司 | A kind of LTE frequency resource multiplexing method under the subway covering scene based on single antenna |
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| CN1913718A (en) * | 2006-09-01 | 2007-02-14 | 清华大学 | Space-time block code downlink transfer power distribution method based on interrupt probability |
| CN101217301A (en) * | 2008-01-10 | 2008-07-09 | 北京邮电大学 | A collaborative transmission method realized in isomerization wireless network with cooperating relay nodes |
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| CN1913718A (en) * | 2006-09-01 | 2007-02-14 | 清华大学 | Space-time block code downlink transfer power distribution method based on interrupt probability |
| CN101217301A (en) * | 2008-01-10 | 2008-07-09 | 北京邮电大学 | A collaborative transmission method realized in isomerization wireless network with cooperating relay nodes |
| CN101227242A (en) * | 2008-01-31 | 2008-07-23 | 西安交通大学 | Method for forming distributed aerial array beam based on channel correction |
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