CN105577255A - Channel state information reference signal sending method and apparatus thereof - Google Patents
Channel state information reference signal sending method and apparatus thereof Download PDFInfo
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- CN105577255A CN105577255A CN201410547338.9A CN201410547338A CN105577255A CN 105577255 A CN105577255 A CN 105577255A CN 201410547338 A CN201410547338 A CN 201410547338A CN 105577255 A CN105577255 A CN 105577255A
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Abstract
The invention provides a channel state information reference signal CSI-RS sending method and an apparatus thereof. The CSI-RS is sent through a plurality of antenna arrays. The method comprises the following steps of creating a mapping relation of a sending port of the CSI-RS and the plurality of antenna arrays in a preset sending period, wherein the preset sending period comprises at least two sending moments; according to the preset sending period and the mapping relation, sending the CSI-RS. In the technical scheme provided in the invention, the different antenna arrays are selected to map a CSI-RS port at the different moments so that the plurality of the antenna arrays are used to send the CSI-RS and a channel estimation error is reduced.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of sending method and device of channel state information reference signals.
Background technology
In existing cellular system, transmission end of base station wave beam only can adjust in horizontal dimensions, and vertical dimensions is fixing angle of declination to each user.In fact, because real channel is inherently three-dimensional, and common exterior aerial has multiple a period of time in the vertical dimension., as shown in Figure 1, therefore, the basis of horizontal beam excipient is introduced the wave beam adjustment of vertical dimensions, and the weights namely by adjusting vertical dimensions a period of time change the vertical direction of wave beam, have vital meaning for further elevator system performance, this also makes 3D-MIMO become one of 3GPPR12 standardization focus.
CSI-RS (ChannelStateInformationReferencesignal, channel condition information reference symbol) is mainly used as UE and measures to obtain channel condition information and feed back CQI and PMI etc. accordingly.Fig. 2 gives 2 ports, the pattern of 4 ports and 8 port CSI-RS.CSI-RS pattern in Fig. 2 is preferably applied in FDD system, does not get rid of for TDD system.For 8 port CSI-RS in scheming, together with the port 0 of CSI-RS is multiplexing by the mode of the CDM (codedivisionmultiplexing code division multiplexing) of time domain with port one, is specially two RE close on same subcarrier and supports two ports by OCC (orthogonalcovercode orthogonal covering codes).Port 2 and port 3, port 4 and port 5, the rest may be inferred for port 6 and port 7.
In 3D beam-forming system, the design of 3D code book is a crucial step, which determine the implementation complexity of antenna system to mechanism such as the control precision of wave beam and system feedback.In the prior art, the thinking of 3D codebook design continues to use 2D code book, adopts certain algorithm, and the basis of 2D code book directly generates 3D pre-coding matrix, and namely 3D pre-coding matrix is based on independently horizontal dimension code book and two code book synthesis of vertical dimension code book.And two PMI that horizontal dimension code book and vertical dimension code book are fed back by UE respectively (Pre-codingmatrixIndication, pre-coding matrix indicates) obtain.UE obtains PMI1 by measurement one group of CSI-RS port, and UE obtains PMI2 by measuring another group CSI-RS port.Wherein, two groups of CSI-RS represent horizontal and vertical direction respectively, and two groups of CSI-RS need respectively in one group of horizontal antenna a period of time (or a period of time combination) and the upper transmission of one group of vertical antenna a period of time (or a period of time combination).
In the prior art, the sending method of CSI-RS is, horizontal antenna a period of time corresponding one group of CSI-RS port, vertical antenna a period of time corresponding other one group of CSI-RS port, and two groups of ports are different.As shown in Figure 3, for the antenna element of 5x4 (5 row 4 arrange), CSI-RS port 0,1,2,3 send respectively on 4 horizontal antenna a period of time, and CSI-RS port 4,5,6,7 sends respectively on 4 vertical antenna a period of time.Namely CSI-RS sends in fixing antenna element, makes UE that channel information on the some antennas a period of time sending CSI-RS can only be relied on to estimate the channel information in whole antenna element, thus the error making channel estimation results larger.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides sending method and the device of a kind of channel state information reference signals CSI-RS, by not selecting different antenna element to map CSI-RS port in the same time, thus make more antenna element send CSI-RS, the channel information that UE can rely on the channel information in more antenna element to estimate in whole antenna element, reduces the error of channel estimation results.
The invention provides the sending method of a kind of channel state information reference signals CSI-RS, described CSI-RS is sent by multiple antenna element, described method comprises: the transmit port and the mapping relations of described multiple antenna element within the default transmission cycle that create described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time; According to the described default transmission cycle, send described CSI-RS according to described mapping relations.
The sending method of above-mentioned channel state information reference signals CSI-RS, the arrangement of described multiple antenna element is the capable N row of M, M is more than or equal to 2, N is more than or equal to 2, wherein, described mapping relations also comprise: the antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, described vertical dimensions a period of time row comprise M antenna element, and a described M antenna element is distributed in different rows.
The sending method of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations are: within the described default transmission cycle, each antenna element all have mapped Single port.
The sending method of above-mentioned channel state information reference signals CSI-RS, wherein, M, N are all less than described port number, described mapping relations are: in arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
The sending method of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations are: in arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
The sending method of above-mentioned channel state information reference signals CSI-RS, wherein, M and N sum is more than or equal to described port number, described mapping relations are: in arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
The sending method of above-mentioned channel state information reference signals CSI-RS, wherein, described antenna comprises single-polarized antenna and/or dual polarized antenna.
Present invention also offers the dispensing device of a kind of channel state information reference signals CSI-RS, the arrangement of described multiple antenna element is the capable N row of M, M is more than or equal to 2, N is more than or equal to 2, described device comprises: creation module, for creating transmit port and the mapping relations of multiple antenna element within the default transmission cycle of described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time; Sending module, for according to the described default transmission cycle, sends described CSI-RS according to described mapping relations.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations also comprise: the antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, and described vertical dimensions a period of time row comprise M antenna element, and a described M antenna element is distributed in different rows.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, the arrangement of described multiple antenna element is the capable N row of M, and M is more than or equal to 2, N is more than or equal to 2, wherein, described mapping relations are specially: within the described default transmission cycle, each antenna element all have mapped Single port.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, M, N are all less than described port number, described mapping relations are: in arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations are: in arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, M and N sum is more than or equal to described port number, described mapping relations are: in arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described antenna comprises single-polarized antenna and/or dual polarized antenna.
The beneficial effect of technique scheme of the present invention is as follows:
The invention provides sending method and the device of a kind of channel state information reference signals CSI-RS, by not selecting different antenna element to map CSI-RS port in the same time, thus make more antenna element send CSI-RS, the channel information that UE can rely on the channel information in more antenna element to estimate in whole antenna element, reduces the error of channel estimation results.
Accompanying drawing explanation
Fig. 1 is inner antenna organigram.
Fig. 2 is the CSI-RS pilot configuration figure being applicable to TDD and FDD.
Fig. 3 is CSI-RS transmit port and antenna element mapping relations schematic diagram in prior art.
The schematic flow sheet of the CSI-RS sending method that Fig. 4 provides for the embodiment of the present invention.
The CSI-RS transmit port that Fig. 5 provides for the embodiment of the present invention and antenna element mapping relations schematic diagram.
The CSI-RS transmit port that Fig. 6 provides for the embodiment of the present invention and antenna element mapping relations schematic diagram.
The CSI-RS transmit port that Fig. 7 provides for the embodiment of the present invention and antenna element mapping relations schematic diagram.
The CSI-RS transmit port that Fig. 8 provides for the embodiment of the present invention and antenna element mapping relations schematic diagram.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The embodiment of the present invention is in prior art, because CSI-RS sends in fixing antenna element, make UE can only rely on send CSI-RS some antennas a period of time on channel information to estimate the channel information in whole antenna element, thus the problem of the error making channel estimation results larger, provide sending method and the device of a kind of channel state information reference signals CSI-RS, by not selecting different antenna element to map CSI-RS port in the same time, thus make more antenna element send CSI-RS, the channel information that UE can rely on the channel information in more antenna element to estimate in whole antenna element, reduce the error of channel estimation results.
Fig. 4 is the schematic flow sheet of CSI-RS sending method provided by the invention, and described CSI-RS is sent by multiple antenna element, and the arrangement of described multiple antenna element is the capable N row of M, and M is more than or equal to 2, N and is more than or equal to 2, and as shown in the figure, described method comprises:
Step S400, create transmit port and the mapping relations of described multiple antenna element within the default transmission cycle of described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time;
Step S402, according to the described default transmission cycle, sends described CSI-RS according to described mapping relations.
In above-mentioned CSI-RS sending method, first create transmit port and the mapping relations of multiple antenna element within the default transmission cycle of CSI-RS, according to these mapping relations, send according to the default transmission cycle.Different antenna element is mapped in respectively at different delivery time because these mapping relations make at least there is Single port, thus make the transmit port number of antenna element number beyond CSI-RS that have mapped port within each transmission cycle, relative to prior art, there are more antenna element and port mapping, namely make more antenna element send CSI-RS, reduce the error of channel estimating.
In one embodiment, above-mentioned mapping relations can comprise: described mapping relations also comprise: the antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, described vertical dimensions a period of time row comprise M antenna element, and a described M antenna element is distributed in different rows.
In above-mentioned CSI-RS sending method, at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row have mapped port, namely the antenna element that have mapped port is positioned in certain dimension (horizontal dimensions or vertical dimensions), then when sending CSI-RS, UE can obtain horizontal dimensions code book or vertical dimensions code book thus.
In one embodiment, above-mentioned mapping relations can be specially: within the described default transmission cycle, each antenna element all have mapped Single port.
In above-mentioned CSI-RS sending method, all antenna element all map Single port, and namely make all antenna element to send CSI-RS, channel estimating is more accurate.
In one embodiment, M, N are all less than described port number, described mapping relations can be specially: in arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
In above-mentioned CSI-RS sending method, at each delivery time, section ports is only had to be mapped on arbitrary row of the antenna element that the capable N of this M arranges, or on arbitrary row, and different delivery time, the row or column that have mapped the antenna element of port is not identical.For the antenna element that 5 row 4 arrange, as shown in Figure 5, each transmission cycle comprises 4 delivery times, in the T1 moment, 0,1,2, No. 3 port is sending from lower several 1st row antenna element, in the T3 moment, 0,1,2, No. 3 port is sending from lower several 3rd row antenna element, and UE obtains horizontal dimensions code book thus; In the T2 moment, 4,5,6,7, No. 8 ports sent from left several 1st array antenna a period of time, and in the T4 moment, 4,5,6,7, No. 8 ports sent from left several 3rd array antenna a period of time, and UE obtains vertical dimensions code book thus.Send according to this loop cycle, the transmission cycle can be 5ms, 10ms or other larger values.UE based on the horizontal dimensions code book obtained and vertical dimensions code book synthesis 3D pre-coding matrix, and carries out channel estimating accordingly.
In one embodiment, described mapping relations can be specially: in arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
In above-mentioned CSI-RS sending method, at each delivery time, all ports all have mapped antenna element, and at different delivery times, the antenna element of mapping is distinguished to some extent.
For the antenna element that 5 row 4 arrange, as shown in Figure 6, each transmission cycle comprises 2 delivery times, in the T1 moment, 4,5,6,7, No. 8 ports forming vertical dimensions code book send respectively in 5 antenna element, on different rows, 0,1,2, No. 3 port forming horizontal dimensions code book sends respectively in 4 antenna element, and these 4 antenna element are distributed in different lines in these 5 antenna element distributions; The T2 moment, 4,5,6,7, No. 8 ports forming vertical dimensions code book send respectively in other 5 antenna element different from the T1 moment, these 5 antenna element distributions on different rows, 0,1,2, No. 3 port forming horizontal dimensions code book sends respectively in other 4 antenna element different from the T1 moment, and these 4 antenna element are distributed in different lines; Send according to this loop cycle, the transmission cycle can be 5ms, 10ms or other larger values.UE is after receiving CSI-RS, according to the configuration messages carrying the CSI-RS of antenna element transmission and the corresponding relation of horizontal dimensions code book/vertical dimensions code book of making an appointment or receive in advance, horizontal dimensions code book and vertical dimensions code book can be obtained from corresponding antenna element, based on the horizontal dimensions code book obtained and vertical dimensions code book synthesis 3D pre-coding matrix, and carry out channel estimating accordingly.
In one embodiment, M and N sum is more than or equal to described port number, described mapping relations can be specially: in arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
In above-mentioned CSI-RS sending method, at each delivery time, a line and an array antenna a period of time is all had to have mapped port.For the antenna element that 5 row 4 arrange, as shown in Figure 7, each transmission cycle comprises 3 delivery times, in the T1 moment, 0,1,2, No. 3 port is sending from the antenna element of lower several 1st row, UE obtains horizontal dimensions code book thus, and 3,4,5,6, No. 7 ports sent from left several 1st array antenna a period of time, and UE obtains vertical dimensions code book thus; In the T2 moment, 0,1,2, No. 3 port is sending from lower several 3rd row antenna element, and UE obtains horizontal dimensions code book thus, and 3,4,5,6, No. 7 ports sent from left several 3rd array antenna a period of time, and UE obtains vertical dimensions code book thus; In the T3 moment, 0,1,2, No. 3 port is sending from lower several 5th row antenna element, and UE obtains horizontal dimensions code book thus, and 4,5,6, No. 7 ports sent from left several 4th array antenna a period of time, and UE obtains vertical dimensions code book thus; Send according to this loop cycle, the transmission cycle can be 5ms, 10ms or other larger values.UE based on the horizontal dimensions code book obtained and vertical dimensions code book synthesis 3D pre-coding matrix, and carries out channel estimating accordingly.
In above-mentioned CSI-RS sending method, antenna can comprise single-polarized antenna and/or dual polarized antenna.
For dual polarized antenna, as shown in Figure 8, two antenna element cross-distribution of dual polarized antenna, each transmission cycle comprises 2 delivery times, in the T1 moment, 0,1,2, No. 3 port is sending from lower several 1st row antenna element, and UE obtains horizontal dimensions code book thus, 3, the antenna element of 4,5,6, No. 7 ports in the either direction from left several 1st row sends, and UE obtains vertical dimensions code book thus; In the T2 moment, 0,1,2, No. 3 port is sending from lower several 3rd row antenna element, and UE obtains horizontal dimensions code book thus, and the antenna element of 3,4,5,6, No. 7 ports in the either direction from left several 2nd row sends, and UE obtains vertical dimensions code book thus; Send according to this loop cycle, the transmission cycle can be 5ms, 10ms or other larger values.UE based on the horizontal dimensions code book obtained and vertical dimensions code book synthesis 3D pre-coding matrix, and carries out channel estimating accordingly.
Present invention also offers the dispensing device of a kind of channel state information reference signals CSI-RS, described device comprises: creation module, for creating transmit port and the mapping relations of multiple antenna element within the default transmission cycle of described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time; Sending module, for according to the described default transmission cycle, sends described CSI-RS according to described mapping relations.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, the arrangement of described multiple antenna element is the capable N row of M, M is more than or equal to 2, N is more than or equal to 2, wherein, above-mentioned mapping relations can comprise: described mapping relations also comprise: the antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, described vertical dimensions a period of time row comprise M antenna element, a described M antenna element is distributed in different rows.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations are specially: within the described default transmission cycle, each antenna element all have mapped Single port.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, M, N are all less than described port number, described mapping relations are: in arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described mapping relations are: in arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, M and N sum is more than or equal to described port number, described mapping relations are: in arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
The dispensing device of above-mentioned channel state information reference signals CSI-RS, wherein, described antenna comprises single-polarized antenna and/or dual polarized antenna.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. a sending method of channel state information reference signals CSI-RS, is characterized in that, described CSI-RS is sent by multiple antenna element, and described method comprises:
Create transmit port and the mapping relations of described multiple antenna element within the default transmission cycle of described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time;
According to the described default transmission cycle, send described CSI-RS according to described mapping relations.
2. method as claimed in claim 1, is characterized in that, the arrangement of described multiple antenna element is the capable N row of M, and M is more than or equal to 2, N and is more than or equal to 2, and described mapping relations also comprise:
The antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, described vertical dimensions a period of time row comprise M antenna element, and a described M antenna element is distributed in different rows.
3. method as claimed in claim 2, it is characterized in that, described mapping relations are:
Within the described default transmission cycle, each antenna element all have mapped Single port.
4. method as claimed in claim 2, it is characterized in that, M, N are all less than described port number, and described mapping relations are:
In arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
5. method as claimed in claim 2, it is characterized in that, described mapping relations are:
In arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
6. method as claimed in claim 5, it is characterized in that, M and N sum is more than or equal to described port number, and described mapping relations are:
In arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
7. method as described in any one of claim 1-6, is characterized in that, described antenna comprises single-polarized antenna and/or dual polarized antenna.
8. a dispensing device of channel state information reference signals CSI-RS, is characterized in that, comprising:
Creation module, for creating transmit port and the mapping relations of multiple antenna element within the default transmission cycle of described CSI-RS, the described default transmission cycle comprises at least two delivery times, and described mapping relations are: at least there is Single port and be mapped in different antenna element respectively at different delivery time;
Sending module, for according to the described default transmission cycle, sends described CSI-RS according to described mapping relations.
9. device as claimed in claim 8, is characterized in that, the arrangement of described multiple antenna element is the capable N row of M, and M is more than or equal to 2, N and is more than or equal to 2, and described mapping relations also comprise:
The antenna element that have mapped port comprises at least one horizontal dimensions a period of time row or at least one vertical dimensions a period of time row, wherein, described horizontal dimensions a period of time row comprises N number of antenna element, described N number of antenna element is distributed in different lines, described vertical dimensions a period of time row comprise M antenna element, and a described M antenna element is distributed in different rows.
10. device as claimed in claim 9, it is characterized in that, described mapping relations are specially:
Within the described default transmission cycle, each antenna element all have mapped Single port.
11. devices as claimed in claim 9, it is characterized in that, M, N are all less than described port number, and described mapping relations are:
In arbitrary delivery time, any portion port mapping is in the antenna element of arbitrary row/column, and the different delivery time within the same cycle, the row/column of the antenna element of described any portion port mapping is different.
12. devices as claimed in claim 9, it is characterized in that, described mapping relations are:
In arbitrary delivery time, all of the port is mapped in any portion antenna element, and the different delivery time within the same cycle, the antenna element that described all of the port maps is incomplete same.
13. devices as claimed in claim 12, it is characterized in that, M and N sum is more than or equal to described port number, and described mapping relations are:
In arbitrary delivery time, a part for the antenna element that described all of the port maps is distributed on arbitrary row in described M capable N array antenna a period of time, and another part is distributed on arbitrary row in described M capable N array antenna a period of time.
14. as described in any one of claim 8-13 device, it is characterized in that, described antenna comprises single-polarized antenna and/or dual polarized antenna.
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