CN101777942B - Data transmission method, system and device for multi-cooperation district - Google Patents
Data transmission method, system and device for multi-cooperation district Download PDFInfo
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Abstract
The invention provides a data transmission method for a multi-cooperation district. The method comprises the following steps of: determining a cooperation district for user equipment (UE); allocating time frequency sources for the UE, and informing the allocated time frequency sources to the UE; selecting the available time frequency source by each cooperation district to perform data mapping according to the allocated time frequency resources and the control channel symbols and pilot reference symbols of the cooperation distribute, wherein when performing data mapping, the other cooperation districts outside the home district of the UE also need to refer to the control channel symbols and pilot reference symbols of the home district. In the invention, data mapping and data transmission are carried out by taking the home district of the UE as the reference, thereby realizing the signal strengthened transmission on the same UE by the multi-cooperation district, enabling the different cooperation districts to adopt the same reference to map data, and enhancing the system property.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of data transmission method of multi-cooperation district, system and device.
Background technology
ITU (International Telecommunication Union, International Telecommunications Union) has proposed very harsh requirement for the performance of next generation mobile communication system IMT-Advanced (wide-band mobile communication system).Reach 100MHz such as the maximum system transmission bandwidth, the peak rate of up-downgoing transfer of data need to reach 500M bps and 1Gbps, and system's average spectral efficiency (ase) especially edge spectrum efficiency has been proposed very high demand.In order to satisfy the requirement of the new system of IMT-Advanced, 3GPP has proposed to adopt the multi-point cooperative transmission technology to improve the performance of system in its mobile cellular communication LTE-Advanced of system of future generation.The multi-point cooperative transmission technology is the cooperation between a plurality of transfer points of separating on the geographical position, and in general, a plurality of transfer points are base stations of different districts.The multi-point cooperative transmission technical scheme mainly is divided into two classes: combined dispatching and unite transmission.Combined dispatching is the coordination by the time between the residential quarter, frequency and space resources, for different UE distributes mutually orthogonal resource, avoids interference each other.
Only have a residential quarter different to UE transmission data from the combined dispatching scheme, have a plurality of residential quarters to send data to UE simultaneously in the associating delivery plan, to strengthen UE reception signal.As shown in Figure 1, for three residential quarters in the prior art send the schematic diagram of data to a UE on identical resource, UE receives the signal of a plurality of residential quarters simultaneously as shown in the figure.Like this, the useful signal stack from a plurality of residential quarters can promote the signal quality that UE receives on the one hand, has also reduced on the other hand the interference that UE is subject to, thereby has improved systematic function.
The shortcoming that prior art exists is, mapping and the transmission of data when not having at present a kind of corresponding scheme to solve multi-cell synergetic transmission, if adopt each cooperation district to carry out data-mapping and transmission according to the pilot frequency locations of self, because pilot tone (public guide frequency and/or the dedicated pilot) position of home cell and other cooperation districts is different, therefore other cooperation districts may cause interference to home cell, and can not directly merge the data-signal of a plurality of cooperation districts for UE.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves the mapping that lacks data when solving multi-cell synergetic transmission in the prior art and the technological deficiency that sends corresponding scheme.
For achieving the above object, one aspect of the present invention proposes a kind of data transmission method of multi-cooperation district, may further comprise the steps: determine the cooperation district to user equipment (UE); For the described running time-frequency resource that described UE distributes running time-frequency resource also will distribute is notified described UE; Described each cooperation district selects available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, wherein, other cooperation districts outside the home cell of described UE also need control channel symbol and the pilot reference symbol with reference to described home cell when carrying out data-mapping.
The present invention also proposes a kind of data transmission system of multi-cooperation district on the other hand, comprise UE, the home cell of described UE, other cooperation districts except described home cell with the described UE that determines, described UE, be used for receiving the data of described home cell and described other cooperation districts transmissions, and the data that receive are merged; Described home cell is used for selecting available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and described home cell; Described other cooperation districts are used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of described home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping.
Further aspect of the present invention also proposes a kind of base station, comprises control module and data-mapping module, described control module, and being used for network side is the running time-frequency resource that UE distributes; Described data-mapping module is used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of described home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping.
The present invention is as the criterion by the home cell with UE and carries out data-mapping and transfer of data, other cooperation districts neither can cause interference to the pilot tone of home cell like this, the defective of also having avoided the data-signal of each cooperation district directly not merge, thereby be conducive to realize that multi-cooperation district carries out signal to same UE and strengthens transmission, so that the mapping of different cooperation districts adopts same benchmark to carry out, improved systematic function.
The aspect that the present invention adds and advantage in the following description part 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 the 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 schematic diagram that three residential quarters send data in the prior art to a UE on identical resource;
Fig. 2 be the invention process the data transmission method flow chart of multi-cooperation district;
Fig. 3 A and 3B are a kind of home cell of the embodiment of the invention and the data-mapping schematic diagram of other cooperation districts;
Fig. 4 A and 4B are the another kind of home cell of the embodiment of the invention and the data-mapping schematic diagram of other cooperation districts;
Fig. 5 is the data transmission system structural representation of the multi-cooperation district of the embodiment of the invention;
Figure 6 shows that the structural representation of base station in the embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is when carrying out data-mapping, is as the criterion with the home cell of UE and carries out data-mapping and transfer of data.As one embodiment of the present of invention, when the common reference symbol that other cooperation districts are home cell at its time-frequency resource location, dedicated reference symbol or control channel symbol, on the running time-frequency resource position, do not send data (namely being punched in this running time-frequency resource position).
As shown in Figure 2, for the invention process the data transmission method flow chart of multi-cooperation district, wherein in this embodiment, home cell can be the Serving cell of UE receiving broadcasting information, or the Serving cell nearest with UE.This embodiment may further comprise the steps:
Step S201 determines the cooperation district to UE.Can determine in several ways in the present invention the cooperative cell set between network side and the UE, informing network side after for example can being determined by UE also can be notified UE by network side, below just will be described in the mode of specific embodiment.For example, UE is with the time delay of the pilot signal strength of the peripheral cell that measures and the synchronizing signal that detects and feed back to network side, network side according to pilot signal strength within a period of time mean value or the time delay of synchronizing signal or consider that simultaneously both determine a cooperative cell set, and cooperation district information in this cooperative cell set is notified to UE.Equally also can determine cooperative cell set according to the pilot signal strength of the peripheral cell of measuring and/or the synchronizing signal time delay of detection by UE, by UE cooperation district information in the cooperative cell set of determining be sent to network side more afterwards.Wherein, along with the change of UE position, cooperative cell set may be a set that becomes slowly, and it will upgrade by certain cycle, and the no more than network preset value of element number M in the cooperative cell set.
Step S202, network side is that UE distributes running time-frequency resource and notifies UE with the running time-frequency resource that distributes according to the business demand of UE.Wherein, as one embodiment of the present of invention, the descending control signaling PDCCH of home cell base station that can be by this UE notifies this UE.And participate in this embodiment, the identical data flow of each cooperation district transmission of this UE cooperative transmission.
Step S203, each cooperation district selects available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, wherein, other cooperation districts outside the home cell of UE also need control channel symbol and the pilot reference symbol with reference to home cell when carrying out data-mapping.More specifically, as one embodiment of the present of invention, the home cell of UE selects available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of this residential quarter, and the time domain mapping symbols original position of other cooperation districts of participation UE cooperative transmission and the home cell of this UE is consistent.In embodiments of the present invention, other cooperation districts can be in several ways be as the criterion with the home cell of UE and carry out data-mapping and transfer of data, for example, other cooperation districts elder generations are enterprising row data mapping in position corresponding to the available running time-frequency resource of the transfer of data of this home cell, if home cell sends common reference symbol on the running time-frequency resource position of distributing for UE, dedicated reference symbol or control channel symbol, then do not send data (namely being punched in this running time-frequency resource position) on this running time-frequency resource position, other positions are shone upon equally according to home cell.Perhaps, other cooperation districts are first with the time-domain resource original position of the home cell time-domain resource original position as himself, control channel symbol and pilot reference symbol according to the running time-frequency resource that distributes and this cooperation district is that UE distributes running time-frequency resource again, if home cell sends common reference symbol or dedicated reference symbol on the running time-frequency resource position that is described UE distribution, then other cooperation districts do not send data on the running time-frequency resource position.Certainly those skilled in the art can also above-mentioned thought according to the present invention expect other flexible modes in the hope of reaching identical technique effect, but these variations that do not break away from inventive concept all should be included within protection scope of the present invention.In order to have below the clearer understanding and will to be described by way of example the present invention, but need to prove that these examples only are in order to make the present invention clearer, to be not meant to limit the present invention.Also need to prove in addition, in these following examples, the dedicated reference symbol of home cell and other cooperation districts is identical, but they also can be different, the processing mode of the processing mode of other cooperation districts and following embodiment is not similar simultaneously for the dedicated reference symbol, does not repeat them here.
Shown in Fig. 3 A and 3B, be a kind of home cell of the embodiment of the invention and the data-mapping schematic diagram of other cooperation districts, wherein Fig. 3 A is the data-mapping figure of the home cell of UE under the short CP, Fig. 3 B is the data-mapping figure of other cooperation districts of UE under the short CP.In Fig. 3 A, control character takies 3 OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol, therefore data are from the 4th OFDM sign-on, and to common reference symbol and dedicated reference symbol R5 region are not carried out data-mapping.In Fig. 3 B, control channel takies 2 of symbols, but for consistent with the home cell mapping, other cooperation districts are also from the 4th sign-on, the dash area of data area is consistent with Fig. 3 B with the R5 symbol, do not participate in the mapping of data symbol, simultaneously do not carry out data-mapping for common reference symbol yet, therefore need to the data symbol that originally is mapped in this position be punched, then only there is the data symbol of home cell in the data symbol of this Serving cell with regard to having carried out correspondence with the home cell data symbol positions of this UE for the common reference symbol position of this Serving cell like this.
Shown in Fig. 4 A and 4B, be the another kind of home cell of the embodiment of the invention and the data-mapping schematic diagram of other cooperation districts, wherein Fig. 4 A is the data-mapping figure of the home cell of UE, Fig. 4 B is the data-mapping figure of other cooperation districts of UE.In Fig. 4 A, control character takies 2 OFDM symbols, so data are from the 3rd OFDM sign-on, and to common pilot symbols and dedicated pilot R5 region are not carried out data-mapping.In Fig. 4 B, control channel takies 3 OFDM symbols, because control channel can not transmitting data information, so data-mapping is from the 4th sign-on, and punch to the original data message the 3rd OFDM symbol transmission this moment.The dash area of data area is consistent with Fig. 4 B with the R5 symbol, do not participate in the mapping of data symbol, simultaneously do not carry out data-mapping for common reference symbol yet, therefore need to the data symbol that originally is mapped in this position be punched, then only there is the data symbol of home cell in the data symbol of this Serving cell with regard to having carried out correspondence with the home cell data symbol positions of this UE for the common reference symbol position of this Serving cell like this.
Preferably, home cell adopts identical scrambler sequence to carry out scrambling when data send with other cooperation districts, thereby so that UE can directly merge the data-signal of each cooperation district, further improves the performance of system.
Step S204, network side carries out the data cooperative transmission at all cooperation districts of this UE (comprising home cell and other cooperation districts) after frequency pilot sign and data symbol mapping are finished.
As shown in Figure 5, be the data transmission system structural representation of the multi-cooperation district of the embodiment of the invention, this system comprises UE 100, the home cell 200 of UE 100, and other cooperation districts 300 except home cell 200 of the UE 100 that determines.UE 100 is used for receiving the data of home cell 200 and 300 transmissions of other cooperation districts, and the data that receive are merged.Home cell 200 is used for selecting available running time-frequency resource to carry out data-mapping according to the control channel symbol of the running time-frequency resource that distributes and home cell 200 and pilot reference symbol.Other cooperation districts 300 are used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping.Particularly, other cooperation districts 300 are that UE 100 distributes running time-frequency resource according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, and judge whether home cell 200 sends common reference symbol, dedicated reference symbol or control channel symbol on the running time-frequency resource position of distributing for UE 100, if judge it is then on this running time-frequency resource position, not send data.Perhaps, other cooperation districts 300 are first with the time-domain resource original position of the home cell 200 time-domain resource original position as himself, be that UE 100 distributes running time-frequency resources according to the running time-frequency resource of distribution and control channel symbol and the pilot reference symbol of this cooperation district more afterwards, and judge whether home cell 200 sends common reference symbol or dedicated reference symbol on the running time-frequency resource position of distributing for UE 100, if judge it is then on this running time-frequency resource position, not send data.
As one embodiment of the present of invention, home cell 200 adopts identical scrambler sequence to carry out scrambling when data send with other cooperation districts 300.
Wherein, the present invention also proposes a kind of base station, is illustrated in figure 6 as the structural representation of base station in the embodiment of the invention, and this base station comprises control module 110 and data-mapping module 120, and control module 110 is used to UE to distribute running time-frequency resource.Data-mapping module 120 is used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping.Particularly, for example, data-mapping module 120 is that described UE distributes running time-frequency resource according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, and judge in the above home cell of running time-frequency resource position of distributing for UE whether send common reference symbol, dedicated reference symbol or control channel symbol, if judge it is then on the running time-frequency resource position, not send data.Perhaps, data-mapping module 120 is first with the time-domain resource original position of the described home cell time-domain resource original position as himself, be that described UE distributes running time-frequency resource according to the running time-frequency resource of distribution and control channel symbol and the pilot reference symbol of this cooperation district more afterwards, and judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol or dedicated reference symbol, if judge it is then on described running time-frequency resource position, not send data.
As one embodiment of the present of invention, home cell adopts identical scrambler sequence to carry out scrambling when data send with other cooperation districts.
The present invention is as the criterion by the home cell with UE and carries out data-mapping and transfer of data, other cooperation districts neither can cause interference to the pilot tone of home cell like this, the defective of also having avoided the data-signal of each cooperation district directly not merge, thereby be conducive to realize that multi-cooperation district carries out signal to same UE and strengthens transmission, so that the mapping of different cooperation districts adopts same benchmark to carry out, improved systematic function.
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 to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (9)
1. the data transmission method of a multi-cooperation district is characterized in that, may further comprise the steps:
Determine the cooperation district to user equipment (UE);
For the described running time-frequency resource that described UE distributes running time-frequency resource also will distribute is notified described UE;
Described each cooperation district selects available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, wherein, other cooperation districts outside the home cell of described UE also will be with reference to control channel symbol and the pilot reference symbol of described home cell when carrying out data-mapping
Wherein, described each cooperation district selects available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district, wherein, other cooperation districts outside the home cell of described UE also need to comprise with reference to control channel symbol and the pilot reference symbol of described home cell when carrying out data-mapping: described other cooperation districts are that described UE distributes running time-frequency resource according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district; Described other cooperation districts judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol, dedicated reference symbol or control channel symbol; If so, then described other cooperation districts do not send data on described running time-frequency resource position, perhaps
Described other cooperation districts are with the time-domain resource original position of the described home cell time-domain resource original position as himself; Described other cooperation districts are that described UE distributes running time-frequency resource according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and this cooperation district again; Described other cooperation districts judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol or dedicated reference symbol; If so, then described other cooperation districts do not send data on described running time-frequency resource position.
2. the data transmission method of multi-cooperation district as claimed in claim 1 is characterized in that, the time-frequency position of the dedicated pilot of described home cell and described other cooperation districts is identical, and adopts identical sequence.
3. the data transmission method of multi-cooperation district as claimed in claim 1 is characterized in that, described definite cooperation district to user equipment (UE) comprises:
Described UE sends to network side with the pilot signal strength of the peripheral cell of measurement and/or the synchronizing signal time delay of detection, determine described cooperation district by described network side according to described pilot signal strength and/or synchronizing signal time delay that described UE sends, the information with each cooperation district sends to described UE again;
Perhaps, determine described cooperation district by described UE according to the pilot signal strength of the peripheral cell of measuring and/or the synchronizing signal time delay of detection, the information with each cooperation district sends to described network side again.
4. the data transmission method of multi-cooperation district as claimed in claim 1 is characterized in that, described home cell is the Serving cell of described UE receiving broadcasting information, or the Serving cell nearest with described UE.
5. the data transmission method of multi-cooperation district as claimed in claim 1 is characterized in that, described home cell adopts identical scrambler sequence to carry out scrambling when data send with described other cooperation districts.
6. the data transmission system of a multi-cooperation district is characterized in that, comprises UE, the home cell of described UE, and other cooperation districts except described home cell of the described UE that determines,
Described UE is used for receiving the data that described home cell and described other cooperation districts send, and the data that receive are merged;
Described home cell is used for selecting available running time-frequency resource to carry out data-mapping according to control channel symbol and the pilot reference symbol of the running time-frequency resource that distributes and described home cell;
Described other cooperation districts are used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of described home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping,
Wherein, described other cooperation districts, the control channel symbol and the pilot reference symbol that are used for according to the running time-frequency resource that distributes and this cooperation district are that described UE distributes running time-frequency resource, and judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol, dedicated reference symbol or control channel symbol, if judge be, then on described running time-frequency resource position, do not send data, perhaps
Described other cooperation districts, be used for first the time-domain resource original position of the described home cell time-domain resource original position as himself, be that described UE distributes running time-frequency resource according to the running time-frequency resource of distribution and control channel symbol and the pilot reference symbol of this cooperation district more afterwards, and judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol or dedicated reference symbol, if judge it is then on described running time-frequency resource position, not send data.
7. the data transmission system of multi-cooperation district as claimed in claim 6 is characterized in that, described home cell adopts identical scrambler sequence to carry out scrambling when data send with described other cooperation districts.
8. a base station is characterized in that, comprises control module and data-mapping module,
Described control module, being used for network side is the running time-frequency resource that UE distributes;
Described data-mapping module is used for according to the running time-frequency resource that distributes and control channel symbol and the pilot reference symbol of this cooperation district, and the control channel symbol of home cell and pilot reference symbol select available running time-frequency resource to carry out data-mapping,
Wherein, described data-mapping module, the control channel symbol and the pilot reference symbol that are used for according to the running time-frequency resource that distributes and this cooperation district are that described UE distributes running time-frequency resource, and judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol, dedicated reference symbol or control channel symbol, if judge be, then on described running time-frequency resource position, do not send data, perhaps
Described data-mapping module, be used for first the time-domain resource original position of the described home cell time-domain resource original position as himself, be that described UE distributes running time-frequency resource according to the running time-frequency resource of distribution and control channel symbol and the pilot reference symbol of this cooperation district more afterwards, and judge in the above home cell of running time-frequency resource position of distributing for described UE whether send common reference symbol or dedicated reference symbol, if judge it is then on described running time-frequency resource position, not send data.
9. base station as claimed in claim 8 is characterized in that, described home cell adopts identical scrambler sequence to carry out scrambling when data send with other cooperation districts.
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| GB2493144A (en) * | 2011-07-21 | 2013-01-30 | Sca Ipla Holdings Inc | Time multiplexed additional carrier for LTE carrier aggregation and machine-type communication (MTC) |
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| CN101128056A (en) * | 2007-09-19 | 2008-02-20 | 中兴通讯股份有限公司 | A method for interference elimination between cooperative cells |
| WO2008050467A1 (en) * | 2006-10-27 | 2008-05-02 | Mitsubishi Electric Corporation | Data communication method, communication system and mobile terminal |
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| WO2008050467A1 (en) * | 2006-10-27 | 2008-05-02 | Mitsubishi Electric Corporation | Data communication method, communication system and mobile terminal |
| CN101128056A (en) * | 2007-09-19 | 2008-02-20 | 中兴通讯股份有限公司 | A method for interference elimination between cooperative cells |
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