CN101500246B - Data transceiving method and apparatus based on communication system provided with relay station - Google Patents
Data transceiving method and apparatus based on communication system provided with relay station Download PDFInfo
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- CN101500246B CN101500246B CN2008100573205A CN200810057320A CN101500246B CN 101500246 B CN101500246 B CN 101500246B CN 2008100573205 A CN2008100573205 A CN 2008100573205A CN 200810057320 A CN200810057320 A CN 200810057320A CN 101500246 B CN101500246 B CN 101500246B
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Abstract
The invention provides a data sending and receiving method based on a communication system with a relay station, which comprises the steps: in cells, a base station broadcasts/multicasts common data to a terminal and the relay station covered by the base station; the relay station transmits the common data to a terminal covered by the relay station, the base station uses time frequency resources the same as the data transmitted by the relay station, and a target terminal is selected to send out new data; and interference to the target terminal caused by the relay station and interference to the relay station formed by the new data transmission of the base station are eliminated. The method can reduce the interference when the base station and the relay station use the time frequency resources simultaneously and improve the utilization rate of empty-port resources.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of data receiving-transmitting method and a kind of data source and sink based on the communication system that is provided with relay station based on the communication system that is provided with relay station.
Background technology
In traditional cellular communication system, the coverage of base station is generally less, and iff relying on los path (LOS) transmission, owing to there is high-lager building, the shadow fading of channel can be very obvious, and quality of signals and speed all can reduce.Along with user growing for wireless communication needs, the wireless communication system of a new generation need provide more at a high speed transfer rate, better signal covers and stronger mobility, and according to this demand, prior art has proposed relaying technique.
Relaying technique is at user terminal (User Terminal, UT) with base station (Base Station, relay station (Relay Station is installed BS), RS), come forward signal by set up the little information channel of the high decline of a speed between user terminal and base station, compare with the base station, relay station has flexible arrangement, cost is low, saves advantages such as networking cost.The introducing of relaying technique can also improve power system capacity, increases the sub-district and covers, and improves transmission rate.
With reference to figure 1, show the application scenarios schematic diagram of existing relay station, wherein,
Situation is shown in (one) 101: relay station is installed in the base station covers edge or the serious zone of shadow effect, to reach the purpose of improving signal transmission quality and then improving transmission rate.From system perspective, this laying can make the base station for diverse location user in its overlay area provides fair service dispatch and balanced transmission rate, is generally nontransparent relaying.
Situation is shown in (two) 102: utilize relay station to provide focus to cover, to improve power system capacity, be generally transparent relay;
Situation is shown in (three) 103: relay station is installed in base station range zone in addition, all arrives receiving terminal by relaying with control information and user data, base station range is enlarged.This just makes that (for example, lack core net access point or space less) forwarding by relay station provides effective access service in the area that is difficult for laying the base station in operator.From user perspective, this signal quality that has improved receiving terminal that lays, service quality and user satisfaction get a promotion; Transmission rate and system ovelay range all increase to some extent simultaneously.
When having relay transmission, the signal of forwarding transmission needs to use extra running time-frequency resource usually, for example, when carrying out descending common data transmission, generally includes following steps:
Step Q1, base station broadcast data are given terminal and relay station in the sub-district;
The data that step Q2, relay station forwarding receive are given terminal and the relay station in its overlay area.
In fact, when relaying stood in to certain terminal forwarding common data, the base station also may send different data to same terminal on identical running time-frequency resource, and this situation will be disturbed the Data Receiving of corresponding terminal unavoidablely; Yet,, will cause the not high problem of utilization rate of air interface resource again if make relay station on different running time-frequency resources, send data with the base station.
In a word, need the urgent technical problem that solves of those skilled in the art to be exactly at present: a kind of data transmit-receive mechanism of the proposition how can innovate based on the communication system that is provided with relay station, use the interference of running time-frequency resource simultaneously in order to effective minimizing base station and relay station, improve utilization rate of air interface resource.
Summary of the invention
Technical problem to be solved by this invention provides a kind of data receiving-transmitting method based on the communication system that is provided with relay station, can use running time-frequency resource simultaneously in order to guarantee base station and relay station, effectively avoid interference, thus the utilance of raising interface-free resources.
The present invention also provides a kind of data source and sink based on the communication system that is provided with relay station, in order to guarantee said method realization and application in practice.
For solving the problems of the technologies described above, the embodiment of the invention discloses a kind of data receiving-transmitting method based on the communication system that is provided with relay station, comprising:
Terminal and relay station broadcast/multi broadcast common data that described base station covers to this base station in the sub-district;
Described relay station is transmitted the terminal that described common data covers to this relay station, and described base station is used with relay station and transmitted the identical running time-frequency resource of data, and choose target terminal and send new data,
Eliminate described relay station interference and the described base station that described target terminal causes sent the interference that new data forms relay station;
The described relay station of described elimination is specially the interference that described target terminal causes:
Described target terminal receives the dispatch that the base station sends, and obtains the interference signal S that relay station sends in this transfer order signal
2And transformat;
Described target terminal received signal R
2, described R
2Comprise the useful data of described base station transmission and the interfering data that described relay station sends;
Described target terminal carries out channel estimating according to the pilot tone of the interfering data that relay station sends, and obtains the channel of relay station to described target terminal
Described target terminal passes through formula
Carry out Interference Cancellation to the received signal,
Be the signal after the interference eliminated.
Preferably, choose described target terminal by following steps:
Measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends;
Choosing described signal strength signal intensity or quality is target terminal above the terminal of presetting thresholding.
Preferably, choose described target terminal by following steps:
Obtain described base station and cover location information of terminals;
The nearest terminal of the described base station location of selected distance is a target terminal.
Preferably, choose described target terminal by following steps:
Estimate the arrival angle that terminal that described base station covers transmits, and locate the orientation of described terminal;
Choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
Preferably, eliminate described base station by following steps and send the interference that new data forms relay station:
Increase the transmitting power of described relay station.
The embodiment of the invention also discloses a kind of data source and sink, comprising based on the communication system that is provided with relay station:
Be positioned at first transmitting element of base station, be used for the terminal and the relay station broadcast/multi broadcast common data that cover to this base station in the sub-district;
Be positioned at base station second transmitting element of base station, be used to use with relay station and transmit the identical running time-frequency resource of data, choose target terminal and send new data;
Be positioned at the retransmission unit of relay station, be used to transmit the terminal that described common data covers to this relay station;
Interference cancellation unit is used to eliminate described relay station interference and the described base station that described target terminal causes is sent the interference that new data forms relay station;
The described relay station of described elimination is specially the interference that described target terminal causes:
Described target terminal receives the dispatch that the base station sends, and obtains the interference signal S that relay station sends in this transfer order signal
2And transformat;
Described target terminal received signal R
2, described R
2Comprise the useful data of described base station transmission and the interfering data that described relay station sends;
Described target terminal carries out channel estimating according to the pilot tone of the interfering data that relay station sends, and obtains the channel of relay station to described target terminal
Described target terminal passes through formula
Carry out Interference Cancellation to the received signal,
Be the signal after the interference eliminated.
Preferably, described interference cancellation unit comprises:
The Data Receiving subelement, being used to receive the downlink data that described base station sends is useful data, receiving the common data that described relay station transmits is interfering data;
The channel estimating subelement is used to estimate the down channel of described relay station;
Disturb and remove subelement, be used to remove the interfering data on the described channel.
Preferably, described second transmitting element comprises:
Measure subelement, be used to measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends;
First chooses subelement, and being used to choose the terminal that described signal strength signal intensity or quality surpass default thresholding is target terminal.
Preferably, described second transmitting element comprises:
The locator unit is used to obtain the location information of terminals of described base station and base station covering;
Second chooses subelement, and being used for the nearest terminal of the described base station location of selected distance is target terminal.
Preferably, described second transmitting element comprises:
Smart antenna estimation subelement is used to the arrival angle of estimating that described base station terminal transmits, and locatees the orientation of described terminal;
The 3rd chooses subelement, be used to choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
Preferably, described interference cancellation unit comprises:
Power is adjusted subelement, is used to adjust the transmitting power of described base station or relay station.
Preferably, described interference cancellation unit is positioned at terminal.
Compared with prior art, the embodiment of the invention has the following advantages:
The present invention makes base station and relay station transceive data on identical running time-frequency resource in the sub-district, and the described relay station of elimination sends the interference that new data forms relay station to interference and the described base station that described target terminal causes in the process of data transmit-receive.Promptly, guaranteed that base station and relay station use the feasibility of running time-frequency resource simultaneously, thereby effectively improved the utilance of interface-free resources in the communication system by of the interference of minimizing base station with relay station transceive data on identical running time-frequency resource.
Description of drawings
Fig. 1 is the schematic diagram of the application scenarios of relay station in the prior art;
Fig. 2 is the flow chart of a kind of data receiving-transmitting method embodiment 1 based on the communication system that is provided with relay station of the present invention;
Fig. 3 is the flow chart of a kind of data receiving-transmitting method embodiment 2 based on the communication system that is provided with relay station of the present invention;
Fig. 4 is a kind of concrete communication system scene schematic diagram;
Fig. 5 is the structured flowchart of a kind of data source and sink embodiment based on the communication system that is provided with relay station of the present invention;
Fig. 6 uses the flow chart that preferred embodiment shown in Figure 5 carries out data transmit-receive.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The present invention can be used in numerous general or special purpose communication system environment that are provided with relay station or the configuration.For example: B3G system, WIMAX system or the like.
One of core idea of the embodiment of the invention is, take for reducing interface-free resources, make base station and relay station transceive data on identical running time-frequency resource in the sub-district, and the described relay station of elimination sends the interference that new data forms relay station to interference and the described base station that described target terminal causes in the process of data transmit-receive.Promptly, guaranteed that base station and relay station use the feasibility of running time-frequency resource simultaneously, thereby effectively improved the utilance of interface-free resources in the communication system by of the interference of minimizing base station with relay station transceive data on identical running time-frequency resource.
With reference to figure 2, show the flow chart of a kind of data receiving-transmitting method embodiment based on the communication system that is provided with relay station of the present invention, described communication system comprises base station, relay station and terminal, described method can may further comprise the steps:
Terminal and relay station broadcast/multi broadcast common data that step 201, base station cover to this base station in the sub-district;
Be understandable that in the sub-district, when sending the common data that needs the forwarding of process relay station in the down link of base station in the sub-district, the terminal that relay station and this base station cover all can receive; And when relay station further is forwarded to this common data the terminal of this relay station covering, if the base station uses identical running time-frequency resource to send new data to its terminal, the terminal that new data then may occur receiving is subjected to the problem that relay station is transmitted the interference of common data.
In the present embodiment, for the interference that this relay station causes described target terminal, can eliminate by following substep:
The downlink data that substep A1, described target terminal receive the transmission of described base station is a useful data, and the common data that receives described relay station forwarding is an interfering data;
The down channel of substep A2, the described relay station of estimation;
Interfering data on substep A3, the described channel of removal.
The another kind of interference that may occur is, when relay station when the terminal of its covering is transmitted common data, if this terminal is in the scope that the base station covers, then the base station also can use identical running time-frequency resource to send new data to this terminal, in this case, the base station sends new data and then relay station forwarding common data has been formed interference.
In the present embodiment, send new data to the interference that relay station forms, can eliminate by following substep for this base station:
The signal strength signal intensity or the signal quality of the pilot channel of the common down channel that substep B1, the described base station of measurement send;
Substep B2, to choose the terminal that described signal strength signal intensity or quality surpass default thresholding be target terminal.
And/or,
Substep C1, obtain described base station and cover location information of terminals;
Substep C2, the nearest terminal of the described base station location of selected distance are target terminal.
And/or,
Substep D1, estimate the arrival angle that terminal that described base station covered transmits, and locate the orientation of described terminal;
Substep D2, choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
And/or,
The transmitting power of substep E, the described relay station of increase.
The execution mode of above-mentioned increase relay station transmitting power only is used for for example, in practice, can be by changing the transmitting power size of base station and relay station, as by increase the base station and transmitting power eliminate the interference that relay station is transmitted common data, the transmitting power that increases relay station is eliminated the interference that the base station sends new data; Perhaps, by reduce the base station and transmitting power eliminate the interference that relay station is transmitted common data, it all is feasible that the transmitting power that reduces relay station is eliminated the modes such as interference that the base station sends new data, the present invention does not need this to limit.
The method of above-mentioned interference eliminated combination in any is in the present invention used.Certainly, those skilled in the art can also set up the method for other interference eliminated as required on their own, and the present invention does not limit this.
With reference to figure 3, show the flow chart of a kind of data receiving-transmitting method embodiment 2 based on the communication system that is provided with relay station of the present invention, described communication system comprises base station, relay station and terminal, described method can may further comprise the steps:
Correspondingly, the terminal that covered of the relay station of described sub-district and base station receives described common data;
In actual process, target terminal can obtain transformat and the running time-frequency resource that described relay station is transmitted common data, guarantees the processing of next step.
Further specify the embodiment of the invention below in conjunction with communication system scene schematic diagram shown in Figure 4, in the application scenarios shown in Figure 4, BS is the base station, and RS1 is a relay station, and UT1, UT2 are terminal, and the data transmit-receive process of using present embodiment can may further comprise the steps:
Broadcast/multi broadcast need be by RS in the sub-district for step S1, BS
1The common data of transmitting, and definite RS
1Transmit the transformat and the running time-frequency resource of common data;
In practice, and the multimedia broadcast multi-broadcasting business that common data can comprise system message in the sub-district, transmit in the sub-district (Multimedia Broadcast and Multicast Service, MBMS) etc.
RS in step S2, the sub-district
1And UT
2Receive described common data;
Because UT
1At RS
1Coverage in, and outside the coverage of BS, so can only receive RS
1The data of transmitting, and can't receive the common data that BS sends.
Step S3, RS
1The common data that receives is transmitted to UT
1, simultaneously, BS is to UT
2Send new data;
Have in the sub-district under the situation of a plurality of relay stations, the forwarding of described common data can be in the following ways:
First kind of mode, each relay station adopt identical running time-frequency resource and transformat to send common data, and for example, (Single Frequency Network, mode SFN) sends common data with single frequency network.
In this case, if from the time-delay of the data incoming terminal of different relay stations in certain scope, then this SFN transmission means can make terminal carry out soft merging, soft merging was meant before decoding, the signal that terminal will come from a plurality of sub-districts merges, this mode can be brought diversity gain, can save MBMS power again, thereby receptivity is improved;
The second way, each relay station is transmitted common data and is adopted the mode that sends separately, and promptly each relay station can use different transformats and running time-frequency resource to transmit common data separately.
For the purpose of the present invention, all be feasible no matter which kind of send mode repeater adopt transmit common data, those skilled in the art as required or experience select arbitrarily to get final product, the present invention is not limited this.
In practice, among the described step S3 following disturbing factor may appear:
First kind of factor is to suppose UT
1Be arranged in the coverage (Fig. 3 is not shown) of BS, so UT
1Not only can receive RS
1The common data of transmitting can also receive the downlink data that BS sends, if BS and RS
1On identical running time-frequency resource, send data, then UT
1Receive RS
1The common data of transmitting can be subjected to the interference that BS sends downlink data.
Certainly, if UT
1Be in outside the coverage of BS,, therefore also just can be subjected to the interference that BS sends downlink data owing to do not receive the data that BS sends.
Second kind of factor is UT
2Not only can receive the downlink data that BS sends, can also receive RS
1If the common data of transmitting is BS and RS
1On identical running time-frequency resource, send data, then UT
2The downlink data that receives the BS transmission can be subjected to RS
1Transmit the interference of common data.
Further, suppose that BS is to UT
1Between channel H
01Expression, BS is to UT
2Channel H
02Expression, RS
1To UT
1Channel H
11Expression, RS
1To UT
2Channel H
12Expression, the data that BS sends are S
1, RS
1The data that send are S
2, UT
1The signal that receives is R
1, UT
2The signal that receives is R
2(probability density function that refers to noise satisfies the normal distribution statistical property to white Gaussian noise, its power spectral density function is a noise like of constant simultaneously, and it can reflect the additive noise situation in the actual channel really, represents the characteristic of interchannel noise more truly) be N
0
UT
1The signal R that receives
1Can pass through following formulate:
R
1＝H
11·S
2+H
01·S
1+N
0
As can be seen, UT
1The signal that receives comprises H
11S
2And H
01S
1, wherein, H
11S
2Be RS
1Be forwarded to U
T1Common data, H
01S
1For BS is sent to UT
1Downlink data, i.e. interference signal.If UT
1Outside the coverage of BS, the transmission signal of BS is to UT
1Reception influence very little, this numerical value is 0 or very little, so disturb very little; If UT
1In the coverage of BS, execution in step S4 then;
Step S4, if UT
1Within the coverage of BS, BS select target terminal UT
2Send;
Preferably, can choose described target terminal by following substep:
Substep F1, measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends by the terminal that the base station covered;
The terminal that substep F2, the described signal strength signal intensity of described base station selection or quality surpass default thresholding is a target terminal.
Perhaps, can choose the target terminal of described base station by following substep:
Substep G1, obtain described base station and cover location information of terminals;
Described positional information can be obtained by GPS.
Substep G2, the nearest terminal of the described base station location of selected distance are target terminal.
Perhaps, can choose the target terminal of described base station by following substep:
Substep H1, estimate the arrival angle that terminal that described base station covered transmits, and locate the orientation of described terminal;
In practice, can estimate the arrival angle that terminal transmits by antenna system, and the residing orientation of definite terminal.
Substep H2, choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
Described target terminal can not cause interference to the transmission of relay station.
Based on the application scenarios of Fig. 4, because UT
2Nearer from BS, BS can adopt smaller transmission power to UT
2Send downlink data, i.e. S
1Power reduction, thereby make UT
1The reception signal interference ratio improve.As can be seen, the selection principle of described target terminal can for, choose the terminal that can effectively reduce the BS transmitted power, concrete method can also comprise and improves RS
1Transmitted power, that is, make signal S
2Power increases, perhaps, and the terminal that selective reception power is bigger etc.That is to say, in practice, can also be by changing the transmitting power size of base station and relay station, as by increase the base station and transmitting power eliminate the interference that relay station is transmitted common data, the transmitting power that increases relay station is eliminated the interference of base station transmission new data; Perhaps, by reduce the base station and transmitting power eliminate the interference that relay station is transmitted common data, reduce the transmitting power of relay station and eliminate the interference that the base station sends new data.
Certainly, the above-mentioned method of choosing the target terminal of described base station only is used for example, and it all is feasible that those skilled in the art adopt any method, and the present invention does not need this to limit.
To UT
2The interference that causes can solve by the method for following interference eliminated:
UT
2The signal R that receives
2Can pass through following formulate:
R
2＝H
02·S
1+H
12·S
2+N
0
As can be seen, UT
2The signal that receives comprises H
02S
1And H
12S
2, wherein, H
02S
1For BS is sent to UT
2Downlink data, H
12S
2Be RS
1Be forwarded to UT
2Common data, i.e. interference signal.Because S
2Can obtain from step S1, and S
2Transformat and running time-frequency resource can obtain by the scheduling control signaling by BS, therefore can be by UT
2Carry out interference elimination treatment to the received signal.Suppose UT
2The signal that carries out after the interference eliminated is R
2', then can pass through following formulate:
R
2′＝R
2-(H
12+ε)·S
2＝(H
02·S
1+H
12·S
2+N
0)-(H
12+ε)·S
2
＝H
02·S
1-ε·S
2+N
0
Wherein, H
02S
1Be UT
2The useful signal that the BS that receives sends, and H
12S
2Be UT
2The RS that receives
1The interference signal that sends, ε is UT
2To RS
1And UT
2Between the error that produces when carrying out channel estimating of channel.As can be seen, as long as channel estimating is enough accurate, RS
1Transmission to UT
2The interference that causes can be eliminated or reduce to enough little.
Thereby, preferred, in embodiments of the present invention, can eliminate by following substep and disturb:
The downlink data that substep I1, described target terminal receive the transmission of described base station is a useful data, and the common data that receives described relay station forwarding is an interfering data;
The down channel of substep I2, the described relay station of estimation;
Interfering data on substep I3, the described channel of removal.
Be corresponding described UT
2Received signal and carry out interference eliminated detailed process can for:
1) UT
2Receive the dispatch that BS sends, in this dispatch, obtain RS
1The interference signal S that sends
2And transformat;
2) UT
2Receive the useful signal S that BS sends
1And RS
1The interference signal S that sends
2
3) UT
2The pilot tone that sends signal according to RS1 is carried out channel estimating, obtains RS
1To UT
2Channel
For:
Wherein, ε is a channel estimation errors.
4) UT
2Carry out Interference Cancellation to the received signal, can be by following formula manipulation:
R
2′＝R
2-(H
12+ε)·S
2＝(H
02·S
1+H
12·S
2+N
0)-(H
12+ε)·S
2
5) signal that obtains through previous step is H
02S
1-ε S
2+ N
0
Be understandable that,, removed most of RS through above-mentioned processing
1To its interference signal S that causes
2, again BS is arrived UT
2Channel do channel estimating and obtain to beat H
02Thereby, can be to recover useful signal S
1
For aforesaid method step flow process, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can be referring to the associated description of other embodiment.
With reference to figure 5, show the structured flowchart of a kind of data source and sink embodiment based on the communication system that is provided with relay station of the present invention, can comprise:
Be positioned at first transmitting element 511 of base station 51, be used for the terminal and the relay station broadcast/multi broadcast common data that cover to this base station in the sub-district;
Be positioned at second transmitting element 512 of base station 51, be used to use with relay station and transmit the identical running time-frequency resource of data, choose target terminal and send new data;
Be positioned at the retransmission unit 513 of relay station 52, be used to transmit the terminal that described common data covers to this relay station;
Preferably, in the present embodiment, described interference cancellation unit 514 can comprise:
The Data Receiving subelement, being used to receive the downlink data that described base station sends is useful data, receiving the common data that described relay station transmits is interfering data;
The channel estimating subelement is used to estimate the down channel of described relay station;
Disturb and remove subelement, be used to remove the interfering data on the described channel.
With or,
Measure subelement, be used to measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends;
First chooses subelement, and being used to choose the terminal that described signal strength signal intensity or quality surpass default thresholding is target terminal.
And/or,
The locator unit is used to obtain the positional information of described base station and base station terminal;
Second chooses subelement, and being used for the nearest terminal of the described base station location of selected distance is target terminal.
And/or,
Smart antenna estimation subelement is used to the arrival angle of estimating that described base station terminal transmits, and locatees the orientation of described terminal;
The 3rd chooses subelement, be used to choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
And/or,
Power is adjusted subelement, is used to adjust the transmitting power of described base station or relay station.
In practice, described relay station can be provided with a plurality of, the transformat that each relay station is transmitted common data and running time-frequency resource can be for identical, also can be for having nothing in common with each other.
With reference to figure 6, show and use the flow chart that preferred embodiment shown in Figure 5 carries out data transmit-receive, specifically can may further comprise the steps:
Terminal and relay station broadcast/multi broadcast common data that first transmitting element of step 601, base station covers to this base station in the sub-district;
The interference cancellation unit of step 603, described terminal is eliminated described relay station interference and the described base station that described target terminal causes is sent the interference that new data forms relay station.
In practice, when having multistage relaying in the communication system, the relay station of each upper level website control or terminal all can adopt said method to carry out interference eliminated to receiving data when the next stage relaying is transmitted, the reception signal interference ratio of the enough big terminal with assurance next stage relay and control of power when adopting said method to control its transmitting power or next stage relaying when the upper level website sends it simultaneously to transmit.In practice, interference processing method among the present invention can be used separately in having the system of relay station, can combine together with other interference eliminated/interference avoidance technique (as soft multiplex technique) and multi-antenna beam figuration technology etc. yet and use, the present invention is not limited this.
For said apparatus embodiment because it is similar substantially to method embodiment, so describe fairly simple, describe not detailed part and get final product referring to the part explanation of method embodiment.
Need to prove that the present invention can describe, for example program module in the general context of the computer executable instructions of being carried out by computer.Usually, program module comprises the routine carrying out particular task or realize particular abstract, program, object, assembly, data structure or the like.Also can in distributed computing environment (DCE), put into practice the present invention, in these distributed computing environment (DCE), by by communication network connected teleprocessing equipment execute the task.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
In addition, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises " or its any other variant is intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
More than a kind of data receiving-transmitting method and a kind of data source and sink based on the communication system that is provided with relay station based on the communication system that is provided with relay station provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (12)
1. the data receiving-transmitting method based on the communication system that is provided with relay station is characterized in that, comprising:
Terminal and relay station broadcast/multi broadcast common data that the base station covers to this base station in the sub-district;
Described relay station is transmitted the terminal that described common data covers to this relay station, and described base station is used with relay station and transmitted the identical running time-frequency resource of data, chooses target terminal and sends new data;
Eliminate described relay station interference and the described base station that described target terminal causes sent the interference that new data forms relay station; The described relay station of described elimination is specially the interference that described target terminal causes:
Described target terminal receives the dispatch that the base station sends, and obtains the interference signal S that relay station sends in this transfer order signal
2And transformat;
Described target terminal received signal R
2, described R
2Comprise the useful data of described base station transmission and the interfering data that described relay station sends;
Described target terminal carries out channel estimating according to the pilot tone of the interfering data that relay station sends, and obtains the channel of relay station to described target terminal
Described target terminal passes through formula
Carry out Interference Cancellation to the received signal,
Be the signal after the interference eliminated.
2. the method for claim 1 is characterized in that, chooses described target terminal by following steps:
Measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends;
Choosing described signal strength signal intensity or quality is target terminal above the terminal of presetting thresholding.
3. the method for claim 1 is characterized in that, chooses described target terminal by following steps:
Obtain described base station and cover location information of terminals;
The nearest terminal of the described base station location of selected distance is a target terminal.
4. the method for claim 1 is characterized in that, chooses described target terminal by following steps:
Estimate the arrival angle that terminal that described base station covers transmits, and locate the orientation of described terminal;
Choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
5. the method for claim 1 is characterized in that, eliminates described base station by following steps and sends the interference that new data forms relay station:
Increase the transmitting power of described relay station.
6. the data source and sink based on the communication system that is provided with relay station is characterized in that, comprising:
Be positioned at first transmitting element of base station, be used for the terminal and the relay station broadcast/multi broadcast common data that cover to this base station in the sub-district;
Be positioned at second transmitting element of base station, be used to use with relay station and transmit the identical running time-frequency resource of data, choose target terminal and send new data;
Be positioned at the retransmission unit of relay station, be used to transmit the terminal that described common data covers to this relay station;
Interference cancellation unit is used to eliminate described relay station interference and the described base station that described target terminal causes is sent the interference that new data forms relay station;
The described relay station of described elimination is specially the interference that described target terminal causes:
Described target terminal receives the dispatch that the base station sends, and obtains the interference signal S that relay station sends in this transfer order signal
2And transformat;
Described target terminal received signal R
2, described R
2Comprise the useful data of described base station transmission and the interfering data that described relay station sends;
Described target terminal carries out channel estimating according to the pilot tone of the interfering data that relay station sends, and obtains the channel of relay station to described target terminal
Described target terminal passes through formula
Carry out Interference Cancellation to the received signal,
Be the signal after the interference eliminated.
7. data source and sink as claimed in claim 6 is characterized in that, described interference cancellation unit comprises:
The Data Receiving subelement, being used to receive the downlink data that described base station sends is useful data, receiving the common data that described relay station transmits is interfering data;
The channel estimating subelement is used to estimate the down channel of described relay station;
Disturb and remove subelement, be used to remove the interfering data on the described channel.
8. data source and sink as claimed in claim 6 is characterized in that, described second transmitting element comprises:
Measure subelement, be used to measure the signal strength signal intensity or the signal quality of the pilot channel of the common down channel that described base station sends;
First chooses subelement, and being used to choose the terminal that described signal strength signal intensity or quality surpass default thresholding is target terminal.
9. data source and sink as claimed in claim 6 is characterized in that, described second transmitting element comprises:
The locator unit is used to obtain the location information of terminals of described base station and base station covering;
Second chooses subelement, and being used for the nearest terminal of the described base station location of selected distance is target terminal.
10. data source and sink as claimed in claim 6 is characterized in that, described second transmitting element comprises:
Smart antenna estimation subelement is used to the arrival angle of estimating that described base station terminal transmits, and locatees the orientation of described terminal;
The 3rd chooses subelement, be used to choose the transmission wave beam of aiming at described base station down transmission and, the terminal outside described relay station coverage is a target terminal.
11. data source and sink as claimed in claim 6 is characterized in that, described interference cancellation unit comprises:
Power is adjusted subelement, is used to adjust the transmitting power of described base station or relay station.
12., it is characterized in that described interference cancellation unit is positioned at terminal as claim 6,7,8,9,10 or 11 described data source and sinks.
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| CN102088780B (en) * | 2009-12-03 | 2013-11-06 | 电信科学技术研究院 | Method and base station for avoiding signal interference in hierarchical network |
| CN102082630B (en) * | 2010-12-09 | 2013-01-02 | 北京邮电大学 | Network-coded uplink and downlink relay transmission method |
| CN103582024B (en) | 2012-08-06 | 2018-01-23 | 华为技术有限公司 | The sending, receiving method and network system and terminal of downstream signal |
| CN104244426B (en) | 2013-06-09 | 2019-02-05 | 华为技术有限公司 | A kind of resource allocation methods and device of Data Radio Bearer DRB |
| WO2015165103A1 (en) * | 2014-04-30 | 2015-11-05 | 华为技术有限公司 | Method and terminal for eliminating interference |
| CN104038456B (en) * | 2014-05-30 | 2018-02-02 | 北京智谷睿拓技术服务有限公司 | The communication means and communication node of equipment room direct communication |
| CN106034307A (en) * | 2015-03-19 | 2016-10-19 | 中兴通讯股份有限公司 | Method and device for estimating direction of arrival (DOA) beam forming (BF) weight. |
| CN106411450B (en) * | 2015-07-28 | 2018-05-04 | 上海无线通信研究中心 | A kind of configuration of downlink common data channels and its data transmission method |
| WO2018032504A1 (en) * | 2016-08-19 | 2018-02-22 | 华为技术有限公司 | Data transmission method and base station |
| CN109451034B (en) * | 2018-11-28 | 2021-05-07 | 维沃移动通信有限公司 | Data transmission method and equipment |
| CN109618352B (en) * | 2019-01-14 | 2019-11-15 | 普兴移动通讯设备有限公司 | A kind of non line of sight relay communications system based on LTE |
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