CN101932073A - Method for sending and receiving DRS (Dedicated Reference Signal), base station and user equipment - Google Patents
Method for sending and receiving DRS (Dedicated Reference Signal), base station and user equipment Download PDFInfo
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Abstract
The invention provides a method for sending and receiving a DRS (Dedicated Reference Signal), a base station and user equipment (UE). Aiming at a physical resource block distributed by the base station to the UE, the base station distributes DRS patterns which correspond to downlink data of various links to the UE so that information of the DRS patterns distributed to the UE and DRS-RE information distributed for transmitting the DRS can be sent to the UE; according to the information of the DRS patterns distributed to the UE, the base station sends the DRS to the UE, but does not send downlink data on the DRS-RE which is distributed for transmitting the DRS, wherein the DRS patterns are position information of the DRS on a time-frequency resource, or the combination of position information and extended code information; and the DRS patterns which correspond to the downlink data of various links of various UE are all different. By adopting the invention, the DRS for various UE can be transmitted in the multi-user multi-input multi-output technology so that various UE can accurately demodulate the downlink data.
Description
Technical field
The present invention relates to the mobile communication technology field, method, base station and the user terminal of particularly a kind of transmission and receiving DRS (Dedicated Reference Signal).
Background technology
In strengthening Long Term Evolution (LTE-A) system, in order to support higher peak velocity, each sub-district can dispose many transmit antennas, 8 transmit antennas for example, simultaneously, in order to reduce the expense of pilot signal, the DRS (Dedicated Reference Signal) (DRS) that user terminal (UE) uses the base station to send carries out demodulation to downlink data.The base station is when sending DRS, and at every circuit-switched data of UE, promptly each data flow sends DRS respectively, after UE receives each DRS, carries out the demodulation process of corresponding circuit-switched data.
As shown in Figure 1, in a Physical Resource Block (PRB), the Resource Unit (RE) that will be used for DRS adopts the mode of frequency division multiplexing (FDM) to be divided into two groups, be called DRS RE at this RE that will be used for DRS, label is that 1 RE is first group of DRS RE among Fig. 1, label is that 2 RE is second group of DRS RE, and other RE can be used for public reference signal, control signaling and transfer of data, adopts the DRS that the mode of code division multiplexing (CDM) can multiplexing multichannel data on every group of DRS RE.Be specifically as follows: for the single current transfer of data, the DRS of this UE only takies one group of DRS RE and sends, and another group DRS RE can be used for transfer of data.For double-current transfer of data, DRS still only takies one group of DRS RE and sends, and it is multiplexing to adopt the CDM mode to carry out, and another group DRS RE can be used for transfer of data.Transmission for N circuit-switched data stream, wherein N is more than or equal to 3, all transmit DRS on two groups of DRS RE, the DRS of wherein a part of data flow correspondence transmits on first group of DRS RE by the mode of CDM, the DRS of another part data flow correspondence transmits on second group of DRS RE by the mode of CDM, wherein, the way that the way of the DRS of transmission and second group of DRSRE go up the DRS of transmission on first group of DRS RE is all carried out according to the way of agreement regulation.
Said process is all at the many input and output of single user (MIMO), and base station and UE only need carry out transmission and the reception of DRS on fixing DRS RE according to the way of downlink data on predetermined in advance DRS RE.But, MIMO (MU-MIMO) to the multi-user, the a plurality of users that are used for MU-MIMO may use same PRB simultaneously, then can't distinguish each user's DRS in the manner described above, make each user can't accurately carry out the demodulation of downlink data, and still do not have a kind of reasonable method to carry out the DRS transmission in the prior art at MU-MIMO.
Summary of the invention
In view of this, the invention provides a kind of method, base station and UE that sends and receive DRS, so that realize that the DRS at each UE transmits in the MU-MIMO technology, thus make each UE can accurately carry out the demodulation of downlink data.
A kind of method that sends DRS, this method comprises:
At the Physical Resource Block PRB that the base station is distributed for user terminal UE, the DRS pattern of each road downlink data correspondence is distributed for this UE in the base station, the DRS drawing information that will distribute for this UE and be allocated for the DRS Resource Unit RE information of transmitting DRS and send to this UE;
Described base station sends DRS according to the described DRS drawing information that distributes for this UE to described UE, and does not send downlink data described being allocated on the DRS RE that transmits DRS;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
A kind of method that receives DRS, this method comprises:
UE receives among the DRS drawing information of each road downlink data correspondence of distributing for this UE the base station and the PRB for this UE distribution and is allocated for the DRS RE information of transmitting DRS, be not allocated for downlink data receiving on the DRS RE that transmits DRS, and each the road downlink data that receives carried out demodulation according to described DRS drawing information described;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, and perhaps positional information and extended code information combines.
A kind of base station, this base station comprises: pattern allocation units, signaling transmitting element and signal transmitting unit;
Described pattern allocation units are used for distributing the DRS pattern of each road downlink data correspondence for this UE at the PRB for the UE distribution;
Described signaling transmitting element is used for the DRS drawing information that will distribute for described UE and the PRB that distributes for UE is allocated for the DRS RE information of transmitting DRS and sends to described UE;
Described signal transmitting unit is used for sending DRS according to the drawing information that distributes for described UE to described UE, and does not send downlink data described being allocated on the DRS RE that transmits DRS;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
A kind of UE, this UE comprises: signaling receiving element and Data Receiving unit;
Described signaling receiving element is used for receiving the DRS drawing information of each road downlink data correspondence of distributing for this UE the base station and the PRB that distributes for this UE and is allocated for the DRS RE information of transmitting DRS;
Described Data Receiving unit is used for not being allocated for downlink data receiving on the DRS RE that transmits DRS described, and according to described DRS drawing information each the road downlink data that receives is carried out demodulation;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, and perhaps positional information and extended code information combines.
As can be seen from the above technical solutions, the base station is the different DRS pattern of each road downlink data distribution of each UE among the PRB among the present invention, and the DRS drawing information of each the road downlink data correspondence that will distribute for UE sends to UE, makes UE to carry out the demodulation of each road downlink data according to this DRS drawing information; In addition, the base station does not send downlink data described being allocated on the DRS RE that transmits DRS, also the DRS RE information that is allocated for transmission DRS among the PRB can be sent to UE, make UE also not be used to transmit downlink data receiving on the DRS RE of DRS, thereby avoid transmission collision to guarantee the normal transmission of DRS.Therefore, can realize that by the present invention the DRS at each UE transmits in the MU-MIMO technology, make each UE can accurately carry out the demodulation of downlink data.
Description of drawings
Fig. 1 is a DRS RE schematic diagram on the PRB;
First kind of PDCCH structural representation that Fig. 2 provides for the embodiment of the invention;
Second kind of PDCCH structural representation that Fig. 3 provides for the embodiment of the invention;
The third PDCCH structural representation that Fig. 4 provides for the embodiment of the invention;
The 4th kind of PDCCH structural representation that Fig. 5 provides for the embodiment of the invention;
The architecture of base station figure that Fig. 6 provides for the embodiment of the invention;
The UE structure chart that Fig. 7 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Method provided by the present invention mainly comprises: at the base station is the PRB that UE distributes, and the base station is the DRS pattern that UE distributes each road downlink data correspondence, sends to this UE with distributing to the DRS drawing information of this UE and being allocated for the DRS RE information of transmitting DRS; The base station sends DRS according to the DRS drawing information of distributing to this UE to this UE, and does not send downlink data on the DRS RE that is allocated for transmission DRS; Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
Correspondingly, UE receives the DRS drawing information that the base station sends, and utilizes this DRS drawing information to receive DRS so that carry out the demodulation of downlink data, and does not carry out the downlink data reception on the DRS RE that is allocated for transmission DRS.
For MU-MIMO, on a PRB, send the multichannel downlink data of a plurality of UE possibly respectively, downlink data corresponding DRS in every road for each DRS to each UE distinguishes, needs the different DRS pattern of definition.More preferably, in order to obtain better channel estimating performance, each DRS pattern is mutually orthogonal.
In addition, each DRS pattern is to the multiplexing mode that can adopt CDM of running time-frequency resource, and promptly the running time-frequency resource of each DRS pattern correspondence takies identical RE; Also can adopt FDM, perhaps Time Division Multiplexing is perhaps united among CDM, FDM and the TDM at least two kinds mode, and this moment, the running time-frequency resource of each DRS pattern correspondence can take different RE.When the multiplexing mode that can adopt CDM of each DRS pattern to running time-frequency resource, perhaps CDM combines with alternate manner, and then the positional information of DRS pattern reflection DRS on running time-frequency resource and extended code information combines; If the DRS pattern is to the multiplexing mode that adopts TDM, FDM or TDM and FDM combination of running time-frequency resource, the then positional information of DRS pattern reflection DRS on running time-frequency resource.
The mode that relates generally among the present invention is: each DRS pattern adopts the mode of FDM, and the perhaps mode of TDM is perhaps united among CDM, FDM and the TDM at least two kinds mode.Because each UE may adopt different DRS RE, suppose to exist two UE, first UE adopts first group DRS RE, second UE can adopt second group DRS RE, transmits at second group of enterprising line data of DRS RE for fear of first UE, therefore, the base station need send the RE information that is allocated for transmission DRS among the PRB that distributes to UE, the base station can not be carried out downlink data and be sent on this DRS RE, correspondingly, UE can not carry out downlink data and receive on this DRS RE.
Wherein, the DRS drawing information of base station transmission can be the index information that sends the DRS pattern.Base station and terminal can be stored the index of DRS pattern and the corresponding relation between the DRS pattern in advance, and the base station obtains the index of the DRS pattern of definite DRS pattern correspondence according to this corresponding relation, and the index information of this DRS pattern is sent to UE; Correspondingly, after UE receives the index information of DRS pattern, determine the DRS drawing information of the index correspondence of this DRS pattern, thereby carry out the reception of this road DRS according to this corresponding relation.
In addition, the DRS RE information of using among the PRB that distributes to this UE that the base station sends can adopt following four kinds of forms:
First kind of form: the indication information that sends the DRS RE group that is used to transmit DRS among the PRB distribute to this UE.For example, this indication information is a bit mapping; All on first group of DRS RE, transmit if each DRS of all UE among the PRB of this UE is determined to distribute in the base station, the bit of first group of DRS RE correspondence then is set, in the indication information that UE sends just UE can use second group of DRSRE to carry out transfer of data; If determining to distribute to each DRS of all UE among the PRB of this UE, the base station on two groups of DRS RE, transmission is arranged all, the bit of first group of DRS RE and second group of DRS RE correspondence then is set in the indication information that UE sends simultaneously, and then UE all can not carry out transfer of data on these two groups of DRS RE.
Second kind of form: the number L that sends the DRS RE group that is used to transmit DRS among the PRB distribute to this UE.Base station and UE can arrange the use order of each DRS RE group, the use order of this agreement can be the order of fixing, also can be the use order of determining each DRS RE according to predetermined strategy, UE can determine to be the DRSRE group that is used to transmit DRS according to L DRS RE group of this use order.For example, can adopt the signaling of 1 bit to indicate the number of the DRS RE group of transmission DRS, the number that 0 expression is used to transmit the DRS RE group of DRS is 1, if the use of agreement is from first DRS RE group in proper order, the DRS RE that then is identified for transmitting DRS is first group of DRS RE group, the number that 1 expression is used to transmit the DRS RE group of DRS is 2, determines that then two groups of DRS RE all are used to transmit DRS.In this form, the use order of determining each DRS RE according to predetermined strategy can be specially: the use order of determining each DRS RE according to the corresponding relation between parameter preset and the use order, for example, can be with cell ID Cell_ID as parameter, the DRS RE that mod (Cell_ID, 2) is defined as at first using organizes.When adopting second kind of form, the signaling bit number that needs is
Wherein, P is the maximum number of DRS RE group,
Expression rounds up.
The third form: be sent as all DRS pattern sum M of distributing among the PRB of this UE distribution.Base station and UE can arrange the use order of each DRS pattern and the mapping relations of each DRS pattern and DRS RE group, the base station will be distributed to the DRS pattern sum M of distributing among the PRB of UE and send to UE, correspondingly, after UE gets access to the DRS pattern sum of this distribution, the use of each DRS pattern by appointment order and each DRS pattern and the mapping relations that DRS RE organizes determine to distribute to the DRS RE information that is used to transmit DRS among the PRB of UE.For example, the use order of having supposed 4 DRS patterns pre-defined, and preceding 2 DRS patterns are mapped to first group of DRS RE, 2 the DRS patterns in back are mapped to second group of DRS RE, if the DRS pattern that distributes among the PRB for the UE distribution adds up to below 2, illustrate that then the DRS RE group that is used to transmit DRS among the PRB only is first group,, illustrate that then it is first group and second group that the DRS RE that is used to transmit DRS among the PRB organizes if the DRS pattern that distributes among the PRB that distributes for UE adds up to more than 3.Need to prove, value at all DRS pattern sum M that PRB distributed of distributing for this UE is greater than or equal to a current actual DRS pattern number of using of PRB, for example, add up at 3 o'clock at the DRS pattern that PRB distributed that distributes for this UE, the base station can reality use 2 patterns to dispatch the MU-MIMO UE of two single data streams, the DRS of each UE is mapped on one group of different DRS RE, thereby strengthens performance for estimating channel.When the third form of employing, the signaling bit number that needs is
Wherein, Q is the maximum number of DRS pattern,
Expression rounds up.
The 4th kind of form: the number that is sent as the DRS pattern that distributes in each DRS RE group among the PRB that UE distributes.Correspondingly, UE determines that this PRB is used to transmit the DRS RE information of DRS after getting access to the DRS pattern number of the use in each DRS RE group.If the interior DRS pattern number of using of DRS RE group is 0, represent this DRS RE group to be not used in transmission DRS; If on behalf of this DRS RE group, the interior DRS pattern number of using of DRS RE group greater than 0, be used to transmit DRS.
Need to prove that the number of the DRS pattern that distributes in the DRS RE group of the PRB that distributes for this UE is greater than or equal to the current actual DRS pattern number of using of this DRS RE group in the PRB.The independent transmission of can encoding respectively of each information of organizing the number of the DRS pattern that DRS RE distributes, thus also can combined coding compression signaling consumption.
In order further to optimize the performance of MU-MIMO, UE can also further obtain the pattern of distributing to other UE among this PRB obtaining outside the DRS pattern of distributing to self, so that carry out channel estimating and disturb inhibition to handle.
The mode of obtaining the pattern of distributing to other UE among this PRB can adopt following two kinds:
First kind of mode: if the use of the DRS pattern of making an appointment order, the DRS pattern sum that uses among the PRB that the base station can be further will be distributed for UE sends to UE.UE is utilized as DRS pattern sum that uses among the PRB of its distribution and the DRS pattern of distributing to this UE, just can know which the DRS pattern of distributing to other UE is, thereby know that other UE receives the employed resource of DRS, carry out channel estimating and disturb inhibition to handle.
The second way: the base station sends the number of the DRS pattern that uses in each DRS RE group respectively, after the number of the DRS pattern that UE uses in each DRS RE group in obtaining to the PRB of its distribution, give the DRS pattern of this UE according to base station assigns, just can know which the DRS pattern of distributing to other UE is, thereby know that other UE receives the employed resource of DRS, carry out channel estimating and disturb inhibition to handle.
When above-mentioned two kinds of modes of obtaining the pattern of distributing to other UE, the set that is designated as the DRS pattern that uses among the PRB of UE distribution is P, after UE gets access to the number of the total DRS pattern that uses in each DRS RE group, be P ' if distribute to the DRS pattern set of this UE, UE can know that the DRS pattern of distributing to other UE must be to belong to set P-P ', UE can detect the intensity of the signal of the DRS pattern among the set P-P ', when intensity surpasses certain thresholding, just think that this road DRS pattern exists, and, carry out channel estimating and disturb inhibition to handle according to the employed resource of this DRS.
The DRS drawing information of distributing to UE that above-mentioned base station sends to UE and the DRS RE information that is allocated for transmission DRS can send by Physical Downlink Control Channel (PDCCH), as shown in Figure 2, among the figure, carry the index information of the DRS pattern of distributing to this UE in the DRS_idx field, carry the DRS RE information that is allocated for transmission DRS in the DRS_RE_tot field.
In addition, all DRS pattern sums that distribute at above-mentioned PRB also can send by PDCCH, and as shown in Figure 3, the N_DRS field is carried this DRS pattern sum among the figure.
The DRS RE information of using among the PRB for the UE distribution or all DRS pattern sums of distribution also can send by high-level signaling, at this moment, can only send the DRS drawing information of distributing to this UE in PDCCH, as shown in Figure 4.Also can in PDCCH, send all DRS pattern sums that distribute among the DRS drawing information of distributing to this UE and this PRB, as shown in Figure 5.
If all DRS patterns sums that being used for of distributing among the DRS drawing information of the above-mentioned UE of distributing to, this PRB transmitted the DRS RE information of DRS and the PRB that distributes for UE distributes all send by PDCCH, then combined coding can be carried out to these information in the base station, thereby reduces the signaling bit expense.
For the interference of DRS between randomization neighbor cell or the different UEs, the base station can be so that distribute to the DRS RE group equalization that the DRS pattern of the UE on the same PRB is shone upon.2 UE are for example arranged on this PRB, the downlink data of these two UE all is 3 the tunnel, then can distribute in 3 DRS patterns of one of them UE, the DRS pattern that is mapped to first group of DRS RE is than lack 1 who is mapped to second group of DRS RE, distribute in 3 DRS patterns of another UE, the DRS pattern that is mapped to second group of DRS RE is than lack 1 who is mapped to first group of DRS RE, thereby makes two groups of DRSRE go up the DRS equalization of transmission, thus also equalization of phase mutual interference.
After the distribution of averaging, the mapping relations of each DRS pattern of this UE to DRS RE group can be distributed to the UE transmission in the base station, and these mapping relations also can send by PDCCH.For example, can in PDCCH, carry this mapping relations, when the way of the downlink data of this UE is 1 or 2, in this 1 bit, carries 0 indication and use first group of DRS RE, carry 1 indication and use second group of DRS RE with 1 bit; When the way of the downlink data of this UE is during more than 3 and for odd number, carry 0 and indicate the DRS pattern of first group of DRS RE mapping to lack 1 than the DRS pattern that second group of DRS RE shines upon in this 1 bit, the DRS pattern that carries second group of DRS RE mapping of 1 indication lacks 1 than the DRS pattern that first group of DRS RE shines upon.The information of the mapping relations that each DRS pattern of this indication UE is organized to DRS RE can with other signaling bit combined codings.
Base station and UE can adopt the mode of the mapping relations of making an appointment, and the base station is according to these mapping relations of making an appointment, and the DRS pattern of each UE of mapping on each DRS RE group of equalization sends to UE with the DRS drawing information that distributes.
Base station and UE also can determine the mapping relations of each DRS pattern to the DRSRE group according to the parameter strategy of making an appointment, and wherein the parameter strategy can be the strategy of determining according to cell ID or user ID or timeslot number etc.With the cell ID is example, is the UE of Cell_ID for cell ID, and when the way of the downlink data of this UE was 1 or 2, the frequency of utilization skew was the DRS RE group of mod (Cell_ID, 2).When the way of the downlink data of this UE is during more than 3 and for odd number, frequency shift (FS) is that the DRS pattern of the DRS RE group mapping of mod (Cell_ID, 2) is few 1 of the DRS pattern of the DRS RE group mapping of mod (mod (Cell_ID, 2)+1,2) than frequency shift (FS).
More than be the detailed description that method provided by the present invention is carried out, below base station provided by the present invention and UE be described in detail.
The architecture of base station figure that Fig. 6 provides for the embodiment of the invention, as shown in Figure 6, this base station can comprise: pattern allocation units 601, signaling transmitting element 602 and signal transmitting unit 603.
Pattern allocation units 601 are used for distributing the DRS pattern of each road downlink data correspondence for this UE at the PRB for the UE distribution.
Signaling transmitting element 602 is used for the DRS drawing information that will distribute for UE and the PRB that distributes for UE is allocated for the DRS RE information of transmitting DRS and sends to UE.
Signal transmitting unit 603 is used for sending DRS according to the drawing information that distributes for UE to UE, and does not send downlink data on the DRS RE that is allocated for transmission DRS.
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
Particularly, signaling transmitting element 602 can according to and UE DRS pattern of making an appointment and the corresponding relation between the DRS drawing indexing, the DRS drawing indexing of distributing to the DRS pattern correspondence of UE is sent to UE.
In addition, can in advance DRS RE be divided into the K group, wherein, K is the integer greater than 1.
At this moment, signaling transmitting element 602 can specifically send to UE with the indication information that is allocated for the DRS RE group of transmission DRS; Perhaps, the use order according to each DRS RE group of making an appointment with UE sends to UE with the number that is allocated for the DRS RE group of transmission DRS; Perhaps, according to the use order of each DRS pattern of making an appointment with UE and each DRS pattern mapping relations, will send to UE at all DRS pattern sums of above-mentioned PRB distribution with DRS RE group; Perhaps, the number with the DRS pattern of distribution in each DRS RE group among the above-mentioned PRB sends to UE.
Signaling transmitting element 602 can send by PDCCH for the DRS drawing information that UE distributes; The DRS RE information that is allocated for transmission DRS is sent by PDCCH or high-level signaling.
More preferably, signaling transmitting element 602 can also be used for the use order according to each DRS pattern of making an appointment with UE, will send to UE at all DRS pattern sums that PRB distributes by PDCCH or high-level signaling; Perhaps, according to the use order of each DRS pattern of UE agreement and each DRS pattern mapping relations with DRS RE group, the DRS pattern number of use in each DRS RE group is sent to described UE.
For the interference between randomization neighbor cell or each UE, pattern allocation units 601 are in the time can distributing the DRS pattern of each road downlink data correspondence for UE, make the number equalization of the DRS pattern of mapping on each DRS RE group, and each DRS pattern that notice signaling transmitting element 602 will be distributed to UE sends to UE to the mapping relations that DRS RE organizes by PDCCH; Perhaps,, determine the mapping relations of each DRS pattern, and be the DRS pattern that UE distributes each road downlink data correspondence according to these mapping relations to DRS RE group according to the parameter strategy of making an appointment with UE; The parameter strategy makes the DRS pattern equalization of each UE of mapping on each DRS RE group.
The UE structure chart that Fig. 7 provides for the embodiment of the invention, as shown in Figure 7, this UE can comprise: signaling receiving element 701 and Data Receiving unit 702.
Signaling receiving element 701 is used for receiving the DRS drawing information of each road downlink data correspondence of distributing for this UE the base station and the PRB that distributes for this UE and is allocated for the DRS RE information of transmitting DRS.
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, and perhaps positional information and extended code information combines.
In addition, this UE can also comprise: the first pattern determining unit 703.
Signaling receiving element 701 can receive the DRS drawing indexing that the base station sends.
The first pattern determining unit 703 can according to and base station DRS pattern of making an appointment and the corresponding relation between the DRS drawing indexing, determine the DRS pattern of the DRS drawing indexing correspondence that signaling receiving element 701 receives.
Can in advance DRS RE be divided into the K group, wherein, K is the integer greater than 1.
Signaling receiving element 701 receives the indication information of the DRS RE group that is allocated for transmission DRS among the above-mentioned PRB; Perhaps, receive the number of the DRS RE group that is allocated for transmission DRS among the above-mentioned PRB; Perhaps, receive all DRS pattern sums that distribute at above-mentioned PRB; Perhaps, receive the number of the DRS pattern that distributes in each DRS RE group among the described PRB.
At this moment, this UE can also comprise: first information determining unit 704 is according to the use order of each DRS RE group of making an appointment with the base station, and the number that is allocated for the DRS RE group of transmission DRS among the above-mentioned PRB, determine that the DRS RE that is allocated for transmission DRS among the current PRB organizes; Perhaps, utilize all DRS pattern sums that distribute at above-mentioned PRB, determine that the DRS RE that is allocated for transmission DRS among the described PRB organizes according to the use order of each DRS pattern of making an appointment with the base station and each DRS pattern mapping relations with DRS RE group; Perhaps, utilize the number of the DRS pattern that distributes in each DRS RE group, determine that the DRS RE that is allocated for transmission DRS among the above-mentioned PRB organizes according to the use order of each DRS pattern of making an appointment with the base station and each DRS pattern mapping relations with DRS RE group.
Particularly, signaling receiving element 701 can be received as the DRS drawing information that this UE distributes by PDCCH; Receive the DRSRE information that is allocated for transmission DRS among the above-mentioned PRB by PDCCH or high-level signaling.
More preferably, signaling receiving element 701 can also be used for receiving all the DRS pattern sums or the interior DRS pattern number of using of each DRS RE group of distributing at above-mentioned PRB by PDCCH or high-level signaling.
At this moment, this UE can also comprise: the second pattern determining unit 705, the DRS drawing information that is used for the use order according to each DRS pattern of making an appointment with the base station, all DRS patterns sums that distribute at above-mentioned PRB and distributes for this UE is defined as the DRS drawing information of other UE distribution; Perhaps, according to the mapping relations of the DRS pattern number of using in the use order of each DRS pattern of making an appointment with described base station, each DRS RE group, each DRS pattern and DRS RE group and be the DRS drawing information of this UE distribution, be defined as the DRS drawing information of other UE distribution.
For the interference between the DRS of randomization neighbor cell or each UE, signaling receiving element 701 also is used for and can be received as the mapping relations of each DRS pattern of this UE distribution to DRS RE group by PDCCH.
At this moment, this UE can also comprise: the second information determining unit 706 is used for being defined as the DRS RE group that each DRS pattern that this UE distributes is shone upon according to the mapping relations that signaling receiving element 701 receives; Perhaps, according to the parameter strategy of making an appointment with the base station, be defined as the DRS RE group that each DRS pattern that this UE distributes is shone upon, the parameter strategy makes the DRS pattern equalization of each UE of shining upon on each DRS RE group.
By above description as can be seen, the base station is the different DRS pattern of each road downlink data distribution of each UE among the PRB among the present invention, and the DRS drawing information of each the road downlink data correspondence that will distribute for UE sends to UE, makes UE to carry out the demodulation of each road downlink data according to this DRS drawing information; In addition, the base station does not send downlink data described being allocated on the DRS RE that transmits DRS, also the DRS RE information that is allocated for transmission DRS among the PRB can be sent to UE, make UE also not be used to transmit downlink data receiving on the DRS RE of DRS, thereby avoid transmission collision to guarantee the normal transmission of DRS.Therefore, can realize that by the present invention the DRS at each UE transmits in the MU-MIMO technology, make each UE can accurately carry out the demodulation of downlink data.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (25)
1. a method that sends DRS (Dedicated Reference Signal) DRS is characterized in that, this method comprises:
At the Physical Resource Block PRB that the base station is distributed for user terminal UE, the DRS pattern of each road downlink data correspondence is distributed for this UE in the base station, the DRS drawing information that will distribute for this UE and be allocated for the DRS Resource Unit RE information of transmitting DRS and send to this UE;
Described base station sends DRS according to the described DRS drawing information that distributes for this UE to described UE, and does not send downlink data described being allocated on the DRS RE that transmits DRS;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
2. method according to claim 1, it is characterized in that, the DRS pattern of each road downlink data correspondence of described each UE is mutually orthogonal, and adopts a kind of in code division multiplexing CDM, frequency division multiplexing FDM and the time division multiplexing tdm, and perhaps the mode of at least two kinds of associatings is carried out multiplexing to DRS RE.
3. method according to claim 1, it is characterized in that, to send to UE for the DRS drawing information that this UE distributes specifically comprises: described base station and the UE corresponding relation between DRS pattern and the DRS drawing indexing of making an appointment, described base station sends to described UE according to this corresponding relation with the DRS drawing indexing of distributing to the DRS pattern correspondence of this UE.
4. method according to claim 1 is characterized in that, the DRS RE information that is allocated for transmission DRS is sent to this UE specifically comprise:
In advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
The indication information that described base station will be allocated for the DRS RE group of transmission DRS sends to described UE; Perhaps, the make an appointment use order of each DRS RE group of described base station and described UE, the number that described base station will be allocated for the DRS RE group of transmission DRS sends to described UE; Perhaps, the make an appointment mapping relations of the use order of each DRS pattern and each DRS pattern and DRS RE group of described base station and described UE, the base station will send to described UE at all DRS pattern sums of described PRB distribution; Perhaps, the base station sends to described UE with the number of the DRS pattern of distribution in each DRS RE group among the described PRB.
5. according to the described method of the arbitrary claim of claim 1 to 4, it is characterized in that the described DRS drawing information that distributes for this UE sends by downlink physical control channel PDCCH;
The described DRS RE information that is allocated for transmission DRS sends by PDCCH or high-level signaling.
6. method according to claim 1, it is characterized in that, this method also comprises: the make an appointment use order of each DRS pattern of described base station and UE, described base station further will send to described UE at all DRS pattern sums that described PRB distributes by PDCCH or high-level signaling, perhaps according to the use order of each DRS pattern of UE agreement and each DRS pattern mapping relations with DRS RE group, the DRS pattern number of use in each DRS RE group is sent to described UE.
7. method according to claim 1 is characterized in that, in advance DRS RE is divided into the K group, and wherein, K is the integer greater than 1;
The base station is when distributing the DRS pattern of each road downlink data correspondence for UE, make the DRS pattern equalization of each UE of mapping on each DRS RE group, and each the DRS pattern that further will distribute to described UE sends to described UE to the mapping relations that DRS RE organizes by PDCCH; Perhaps,
The mapping relations of each DRS pattern to DRS RE group are determined according to the parameter strategy of making an appointment with described UE in described base station, and are the DRS pattern that UE distributes each road downlink data correspondence according to these mapping relations; Described parameter strategy makes the DRS pattern equalization of each UE of mapping on each DRS RE group.
8. the method for a receiving DRS (Dedicated Reference Signal) DRS is characterized in that, this method comprises:
UE receives among the DRS drawing information of each road downlink data correspondence of distributing for this UE the base station and the PRB for this UE distribution and is allocated for the DRS RE information of transmitting DRS, be not allocated for downlink data receiving on the DRS RE that transmits DRS, and each the road downlink data that receives carried out demodulation according to described DRS drawing information described;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, and perhaps positional information and extended code information combines.
9. method according to claim 8, it is characterized in that, UE reception base station specifically comprises for the DRS drawing information of each road downlink data correspondence that this UE distributes: described UE receives the DRS drawing indexing that described base station sends, and according to and base station DRS pattern of making an appointment and the corresponding relation between the DRS drawing indexing, determine the DRS pattern of the DRS drawing indexing correspondence that receives.
10. method according to claim 8 is characterized in that, UE is received as the DRS RE information that is allocated for transmission DRS among the PRB that this UE distributes and specifically comprises:
In advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
Described UE receives the indication information of the DRS RE group that is allocated for transmission DRS among the described PRB; Perhaps, described UE receives the number of the DRS RE group that is allocated for transmission DRS among the described PRB, according to the use order of each DRS RE group of making an appointment with described base station, determines to be allocated among the described PRB DRS RE group of transmission DRS; Perhaps, described UE receives all DRS pattern sums that distribute at described PRB, according to the use order of each DRS pattern of making an appointment with described base station and each DRS pattern mapping relations, determine that the DRSRE that is allocated for transmission DRS among the described PRB organizes with DRS RE group; Perhaps, described UE receives the number of the DRS pattern that distributes in each DRS RE group among the described PRB, according to the use order of each DRS pattern of making an appointment with described base station and each DRS pattern mapping relations, determine that the DRS RE that is allocated for transmission DRS among the described PRB organizes with DRS RE group.
11. according to Claim 8,9 or 10 described methods, it is characterized in that described UE is received as the DRS drawing information that this UE distributes by PDCCH; Receive the DRS RE information that is allocated for transmission DRS among the described PRB by PDCCH or high-level signaling.
12. method according to claim 8, it is characterized in that, described UE further receives all DRS pattern sums that distribute at described PRB by PDCCH or high-level signaling, and the DRS drawing information that distributes according to the use order of each DRS pattern of making an appointment with described base station and for this UE, be defined as the DRS drawing information of other UE distribution; Perhaps,
Receive the DRS pattern number of using in each DRS RE group by PDCCH or high-level signaling, and according to the mapping relations of the use order of each DRS pattern of making an appointment with described base station, each DRS pattern and DRS RE group and be the DRS drawing information of this UE distribution, be defined as the DRS drawing information of other UE distribution.
13. method according to claim 8 is characterized in that, in advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
Described UE also is used for being received as each DRS pattern that this UE distributes mapping relations to DRS RE group by PDCCH, is defined as the DRSRE that each DRS pattern that this UE distributes shone upon according to these mapping relations and organizes; Perhaps, according to the parameter strategy of making an appointment with described base station, be defined as the DRS RE group that each DRS pattern that this UE distributes is shone upon, described parameter strategy makes the DRS pattern equalization of each UE of shining upon on each DRSRE group.
14. a base station is characterized in that, this base station comprises: pattern allocation units, signaling transmitting element and signal transmitting unit;
Described pattern allocation units are used for distributing the DRS pattern of each road downlink data correspondence for this UE at the PRB for the UE distribution;
Described signaling transmitting element is used for the DRS drawing information that will distribute for described UE and the PRB that distributes for UE is allocated for the DRS RE information of transmitting DRS and sends to described UE;
Described signal transmitting unit is used for sending DRS according to the drawing information that distributes for described UE to described UE, and does not send downlink data described being allocated on the DRS RE that transmits DRS;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, perhaps combining of positional information and extended code information, and the DRS pattern of each road downlink data correspondence of each UE is all inequality.
15. base station according to claim 14, it is characterized in that, described signaling transmitting element according to and described UE DRS pattern of making an appointment and the corresponding relation between the DRS drawing indexing, the DRS drawing indexing of distributing to the DRS pattern correspondence of described UE is sent to described UE.
16. base station according to claim 14 is characterized in that, in advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
The indication information that described signaling transmitting element will be allocated for the DRS RE group of transmission DRS sends to described UE; Perhaps, the use order according to each DRS RE group of making an appointment with described UE sends to described UE with the number that is allocated for the DRS RE group of transmission DRS; Perhaps, according to the use order of each DRS pattern of making an appointment with described UE and each DRS pattern mapping relations, will send to described UE at all DRS pattern sums of described PRB distribution with DRS RE group; Perhaps, the number with the DRS pattern of distribution in each DRS RE group among the described PRB sends to described UE.
17., it is characterized in that described signaling transmitting element will send by PDCCH for the DRS drawing information that described UE distributes according to claim 14,15 or 16 described base stations; The described DRS RE information that is allocated for transmission DRS is sent by PDCCH or high-level signaling.
18. base station according to claim 14, it is characterized in that, described signaling transmitting element also is used for the use order according to each DRS pattern of making an appointment with described UE, will send to described UE at all DRS pattern sums that described PRB distributes by PDCCH or high-level signaling; Perhaps, according to the use order of each DRS pattern of UE agreement and each DRS pattern mapping relations with DRS RE group, the DRS pattern number of use in each DRS RE group is sent to described UE.
19. base station according to claim 14 is characterized in that, in advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
Described pattern allocation units are when distributing the DRS pattern of each road downlink data correspondence for UE, make the DRS pattern equalization of each UE of mapping on each DRS RE group, and each DRS pattern of notifying described signaling transmitting element will distribute to described UE sends to described UE to the mapping relations that DRS RE organizes by PDCCH; Perhaps,, determine the mapping relations of each DRS pattern, and be the DRS pattern that UE distributes each road downlink data correspondence according to these mapping relations to DRS RE group according to the parameter strategy of making an appointment with described UE; Described parameter strategy makes the DRS pattern equalization of each UE of mapping on each DRS RE group.
20. a UE is characterized in that, this UE comprises: signaling receiving element and Data Receiving unit;
Described signaling receiving element is used for receiving the DRS drawing information of each road downlink data correspondence of distributing for this UE the base station and the PRB that distributes for this UE and is allocated for the DRS RE information of transmitting DRS;
Described Data Receiving unit is used for not being allocated for downlink data receiving on the DRS RE that transmits DRS described, and according to described DRS drawing information each the road downlink data that receives is carried out demodulation;
Wherein, the DRS pattern is the positional information of DRS on running time-frequency resource, and perhaps positional information and extended code information combines.
21. UE according to claim 20 is characterized in that, this UE also comprises: the first pattern determining unit;
Described signaling receiving element receives the DRS drawing indexing that described base station sends;
The described first pattern determining unit, be used for according to and base station DRS pattern of making an appointment and the corresponding relation between the DRS drawing indexing, determine the DRS pattern of the DRS drawing indexing correspondence that described signaling receiving element receives.
22. UE according to claim 20 is characterized in that, in advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
Described signaling receiving element receives the indication information of the DRS RE group that is allocated for transmission DRS among the described PRB; Perhaps, receive the number of the DRS RE group that is allocated for transmission DRS among the described PRB; Perhaps, receive all DRS pattern sums that distribute at described PRB; Perhaps, receive the number of the DRS pattern that distributes in each DRS RE group among the described PRB;
This UE also comprises: first information determining unit is used for according to each DRS that makes an appointment with described base station
The use order of RE group, and the number that is allocated for the DRS RE group of transmission DRS among the described PRB determine to be allocated among the described PRB DRS RE group of transmitting DRS; Perhaps mapping relations of organizing according to the use order of each DRS pattern of making an appointment with described base station and each DRS pattern and DRS RE, utilize described all DRS pattern sums that distribute at described PRB, determine to be allocated among the described PRB DRS RE group of transmission DRS; Perhaps mapping relations of organizing according to the use order of each DRS pattern of making an appointment with described base station and each DRS pattern and DRS RE, utilize the number of the DRS pattern that distributes in described each DRS RE group, determine to be allocated among the described PRB DRS RE group of transmission DRS.
23., it is characterized in that described signaling receiving element is received as the DRS drawing information that this UE distributes by PDCCH according to claim 20,21 or 22 described UE; Receive the DRS RE information that is allocated for transmission DRS among the described PRB by PDCCH or high-level signaling.
24. UE according to claim 20 is characterized in that, described signaling receiving element also is used for receiving all the DRS pattern sums or the interior DRS pattern number of using of each DRS RE group of distributing at described PRB by PDCCH or high-level signaling;
This UE also comprises: the second pattern determining unit, the DRS drawing information that is used for the use order according to each DRS pattern of making an appointment with described base station, described all DRS patterns sums that distribute at described PRB and distributes for this UE is defined as the DRS drawing information of other UE distribution; Perhaps, according to the mapping relations of the DRS pattern number of using in the use order of each DRS pattern of making an appointment with described base station, each DRS RE group, each DRS pattern and DRS RE group and be the DRS drawing information of this UE distribution, be defined as the DRS drawing information of other UE distribution.
25. UE according to claim 20 is characterized in that, in advance DRS RE is divided into the K group, wherein, K is the integer greater than 1;
Described signaling receiving element also is used for being received as the mapping relations of each DRS pattern of this UE distribution to DRS RE group by PDCCH;
This UE also comprises: the second information determining unit is used for being defined as the DRS RE group that each DRS pattern that this UE distributes is shone upon according to the mapping relations that described signaling receiving element receives; Perhaps, according to the parameter strategy of making an appointment with described base station, be defined as the DRSRE group that each DRS pattern that this UE distributes is shone upon, described parameter strategy makes the DRS pattern equalization of each UE of shining upon on each DRS RE group.
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