CN101800589B - Pilot frequency processing method, device and mobile terminal - Google Patents
Pilot frequency processing method, device and mobile terminal Download PDFInfo
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- CN101800589B CN101800589B CN200910006248.8A CN200910006248A CN101800589B CN 101800589 B CN101800589 B CN 101800589B CN 200910006248 A CN200910006248 A CN 200910006248A CN 101800589 B CN101800589 B CN 101800589B
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Abstract
The invention discloses a pilot frequency processing method, a device and a mobile terminal. The method is applied to a cooperative multi-point transmission system comprising a plurality of cooperative cells and comprises the following steps of: carrying out multi-antenna processing on a precoding pilot frequency to be transmitted by each cooperative cell in the plurality of cooperative cells; and transmitting the precoding pilot frequency processed by multiple antennas according to a time frequency position of a common pilot frequency in a physical resource block. The invention saves the expenditures of the pilot frequency.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of pilot frequency processing method and device, mobile terminal.
Background technology
In order to improve the throughput of community, carry out the interference coordination of minizone, new generation of wireless communication system, such as, advanced long-term evolution system (Long-Term Evolution Advance, referred to as LTE-Advance), senior international wireless communication system (International MobileTelecommunication Advance, referred to as IMT-Advance) etc., all introduce the cooperative multipoint transmission technology (Coordinate Multipoint Transmissionand Reception, referred to as COMP) between network level.
At present, at 3G (Third Generation) Moblie Partnership Program (3rd Generation PartnershipProject, referred to as 3GPP) define the mapping method of public guide frequency in LTE, public guide frequency here can conciliate the channel estimation reference signal of timing simultaneously as channel quality indication calculation reference signal.Public guide frequency carries out the rear insert reason Resource Block of multiple antennas process in data, and therefore, public guide frequency does not carry multiple antennas process information.In the Combined Treatment and beam coordination of COMP, each cooperation cell is aimed at user and is sent a wave beam, then, further multiple antennas process is likely taked again between each cooperation cell, but, the problem how processed when cooperative multipoint transmission for public guide frequency in correlation technique, not yet proposes effective solution at present.
Summary of the invention
Propose the present invention for the problem not providing public guide frequency how to process when cooperative multipoint transmission in correlation technique, for this reason, main purpose of the present invention is the pilot tone processing scheme providing a kind of improvement, to solve the problem.
To achieve these goals, according to an aspect of the present invention, a kind of pilot frequency processing method is provided.
According to pilot frequency processing method of the present invention, be applied to the cooperative multicast system comprising multiple cooperation cell, comprise following operation: each cooperation cell in multiple cooperation cell, carry out multiple antennas process to sent precoded pilot, and the precoded pilot after multiple antennas process is sent according to the time-frequency location of public guide frequency at Physical Resource Block.
Preferably, precoded pilot after multiple antennas process is carried out transmission according to public guide frequency at the time-frequency location of Physical Resource Block and comprises by each cooperation cell: each cooperation cell, is sent by the precoded pilot after multiple antennas process according to a road public guide frequency at the time-frequency location of Physical Resource Block.
Preferably, multiple antennas process comprises: precoded pilot to be sent is multiplied by multiple antennas process weights, and wherein, multiple antennas process weights are the weights that data carry out wave beam process or precoding processing part.
Preferably, after precoded pilot after sending multiple antennas process, said method also comprises: multiple antennas disposal right value information is fed back to mobile terminal, and wherein, multiple antennas disposal right value information comprises one of following: the call number of multiple antennas process weights, multiple antennas process weights.
Preferably, after multiple antennas disposal right value information is fed back to mobile terminal, said method also comprises: mobile terminal carries out channel estimating according to the precoded pilot after the multiple antennas process received, and measures and the instruction of feedback channel quality information in conjunction with multiple antennas disposal right value information and channel estimation results.
Preferably, multiple cooperation cell is multiple cooperation cell groups, and each cooperation cell group comprises one or more cooperation cell, and each cooperation cell in the group of same cooperation cell adopts identical processing mode to precoded pilot.
Preferably, the position mapping precoded pilot is the whole positions of a road public guide frequency at Physical Resource Block.
Preferably, the position mapping precoded pilot is the portion of a road public guide frequency at Physical Resource Block.
Preferably, the position mapping precoded pilot is the whole positions of multichannel public guide frequency at Physical Resource Block.
Preferably, the position mapping precoded pilot is the portion of multichannel public guide frequency at Physical Resource Block.
To achieve these goals, according to another aspect of the present invention, a kind of pilot tone processing unit is provided.
Pilot tone processing unit according to the present invention comprises: processing module, for carrying out multiple antennas process to sent precoded pilot; Sending module, sends according to the time-frequency location of public guide frequency at Physical Resource Block for the precoded pilot after processing module is carried out multiple antennas process.
Preferably, said apparatus also comprises: feedback module, for multiple antennas disposal right value information is fed back to mobile terminal, wherein, and the call number that multiple antennas disposal right value information is the multiple antennas process weights that carry out multiple antennas process and use or multiple antennas process weights.
To achieve these goals, according to a further aspect of the invention, a kind of mobile terminal is provided.
Mobile terminal according to the present invention comprises: receiver module, for receiving precoded pilot from cooperation cell and multiple antennas disposal right value information, wherein, precoded pilot to be sent is carried out multiple antennas process by cooperation cell, and multiple antennas disposal right value information is carry out the multiple antennas process weights of multiple antennas process or the call number of multiple antennas process weights; Channel estimation module, carries out channel estimating for the precoded pilot received according to receiver module.
Preferably, above-mentioned mobile terminal also comprises: measurement module, for the channel estimation results measure channel quality information instruction obtained in conjunction with multiple antennas disposal right value information and channel estimation module; Feedback module, for feeding back the channel quality information instruction that measurement module measurement obtains.
Pass through the present invention, each or often organize cooperation cell precoded pilot to be sent is carried out multiple antennas process, and the described precoded pilot after multiple antennas process is sent at the time-frequency location of Physical Resource Block according to a certain road public guide frequency, solve in correlation technique the problem not providing public guide frequency how to process when cooperative multipoint transmission, and then save the expense of pilot tone.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the public guide frequency schematic diagram of the normal cyclic prefix frame structure according to correlation technique;
Fig. 2 is the public guide frequency schematic diagram of the long loop prefix frame structure according to correlation technique;
Fig. 3 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four cooperation cell cooperations;
Fig. 4 is under the long loop prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four cooperation cell cooperations;
Fig. 5 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three cooperation cell cooperations;
Fig. 6 is under the long loop prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three cooperation cell cooperations;
Fig. 7 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, selects portion of pilot to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during four cooperation cell cooperations;
Fig. 8 is under the long loop prefix frame structure according to the embodiment of the present invention one, selects portion of pilot to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during four cooperation cell cooperations;
Fig. 9 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four groups of cooperation cell cooperations;
Figure 10 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four groups of cooperation cell cooperations;
Figure 11 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during two groups of cooperation cell cooperations;
Figure 12 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during two groups of cooperation cell cooperations;
Figure 13 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during one group of cooperation cell cooperation;
Figure 14 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during one group of cooperation cell cooperation;
Figure 15 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations;
Figure 16 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations;
Figure 17 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, selects portion of pilot to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during three groups of cooperation cell cooperations;
Figure 18 is under the long loop prefix frame structure according to the embodiment of the present invention two, selects portion of pilot to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during three groups of cooperation cell cooperations;
Figure 19 is the structured flowchart of the pilot tone processing unit according to the embodiment of the present invention;
Figure 20 is the concrete structure block diagram of the pilot tone processing unit according to the embodiment of the present invention;
Figure 21 is the structured flowchart of the mobile terminal according to the embodiment of the present invention;
Figure 22 is the concrete structure block diagram of the mobile terminal according to the embodiment of the present invention.
Embodiment
Functional overview
Consider in correlation technique the problem not providing public guide frequency how to process when cooperative multipoint transmission, embodiments provide the programme of work of a kind of public guide frequency when multipoint cooperative, each community is an antenna port for user, namely, the corresponding road public guide frequency in each community, pilot-frequency expense can be saved largely, precoded pilot to be sent is carried out multiple antennas process, by multiple antennas weighted information and the pilot signal received, the channel quality indication (CQI) information on full bandwidth can be obtained.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiment of the method
According to embodiments of the invention, provide a kind of pilot frequency processing method, be applied to the cooperative multicast system comprising multiple cooperation cell.For each cooperation cell in multiple cooperation cell, the method comprises: carry out multiple antennas process to sent precoded pilot, and the precoded pilot after multiple antennas process is sent according to the time-frequency location of public guide frequency at Physical Resource Block, wherein, the precoded pilot after multiple antennas process can send at the time-frequency location of Physical Resource Block according to a road public guide frequency by each cooperation cell.It should be noted that, multiple cooperation cell is multiple cooperation cell groups, and each cooperation cell group comprises one or more cooperation cell, and each cooperation cell in the group of same cooperation cell adopts identical processing mode to precoded pilot.
Particularly, one or one group of cooperation cell insert pilot tone according to a certain road public guide frequency at the time-frequency location of Physical Resource Block, when maybe this group cooperation cell sends pilot tone in this cooperation cell, other cooperation cell does not send signal at same time-frequency location, here signal comprises data and pilot tone, above-mentioned precoded pilot to be sent is carried out multiple antennas process refer to: precoded pilot to be sent is multiplied by multiple antennas process weights, namely, many transmit antennas are mapped on this road public guide frequency by multiple antennas process by each cooperation cell, wherein, these multiple antennas process weights can be the weights of data beam process or precoding processing part.
After this, multiple antennas disposal right value information is fed back to mobile terminal by each cooperation cell, and wherein, multiple antennas disposal right value information can comprise one of following: the call number of multiple antennas process weights, multiple antennas process weights.
Mobile terminal carries out channel estimating according to the precoded pilot after the multiple antennas process received and multiple antennas disposal right value information, and measures and the instruction of feedback channel quality information in conjunction with multiple antennas disposal right value information and channel estimation results.Below the concrete processing procedure of mobile terminal is described.
Particularly, mobile terminal pilot tone pattern according to a preconcerted arrangement extracts pilot frequency information, and carry out data demodulates according to this pilot frequency information, estimate real channel according to the precoded pilot after the multiple antennas process that demodulation obtains and multiple antennas disposal right value information, and the instruction of feedback channel quality information.
It should be noted that, the number of above-mentioned multiple cooperation cell can be identical with the way of public guide frequency, that is, if four cooperation cell, then select four road public guide frequencies, if three cooperation cell, in the public guide frequency of Ze Cong tetra-road arbitrarily or select three road public guide frequencies according to pre-defined rule, if two cooperation cell, two-way public guide frequency is selected arbitrarily or according to pre-defined rule in the public guide frequency of Ze Cong tetra-road, if a cooperation cell, in the public guide frequency of Ze Cong tetra-road arbitrarily or select a road public guide frequency according to pre-defined rule; The number of above-mentioned multiple cooperation cell also can be different from the way of public guide frequency, such as, and can more than the corresponding two-way in cooperation cell or two-way public guide frequency.
In addition, the position mapping precoded pilot is the whole positions of a road public guide frequency at Physical Resource Block; Or the position mapping precoded pilot is the time-domain position of a road public guide frequency at Physical Resource Block; Or the position mapping precoded pilot is the portion of multichannel public guide frequency at Physical Resource Block.
By this embodiment, the corresponding road public guide frequency in each community, can save pilot-frequency expense largely; By multiple antennas disposal right value information and the pilot signal (that is, above-mentioned precoded pilot) received, the channel quality information instruction on full bandwidth can be obtained; In precoded pilot, carry wave beam process information, signaling feedback expense can be saved, and the multiple antennas process between multiple cooperation cell of being more convenient for; In addition, in the position of Physical Resource Block evenly, density is reasonable for public guide frequency, the channel estimating required for demodulation and channel quality information measurement can be completed simultaneously, because descending special pilot frequency can only as demodulation pilot frequency, therefore, the precoded pilot work after weighting is easier.
Being described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention, for the ease of understanding, being described to the correlation technique relevant with the embodiment of the present invention.
In 3GPP TS 36.211, the mapping position of public guide frequency in Physical Resource Block of regulation is shown in shown in Fig. 1 and Fig. 2.
Fig. 1 is the public guide frequency schematic diagram of the normal cyclic prefix frame structure according to correlation technique, as shown in Figure 1, this frame structure shows 12 subcarriers, 14 OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) public guide frequency that symbol is corresponding, wherein, R
0represent the public guide frequency that antenna port 0 sends, R
1represent the public guide frequency that antenna port 1 sends, R
2represent the public guide frequency that antenna port 2 sends, R
3represent the public guide frequency that antenna port 3 sends.
Fig. 2 is the public guide frequency schematic diagram of the long loop prefix frame structure according to correlation technique, and as shown in Figure 2, this frame structure shows 12 subcarriers, the public guide frequency that 12 OFDM symbol are corresponding, wherein, and R
0represent the public guide frequency that antenna port 0 sends, R
1represent the public guide frequency that antenna port 1 sends, R
2represent the public guide frequency that antenna port 2 sends, R
3represent the public guide frequency that antenna port 3 sends.
As mentioned above, antenna port 0,1, the public guide frequency of 2,3 has defined its pilot tone pattern in LTE system.The embodiment of the present invention based on this, considers the mapping method of pilot tone and Physical Resource Block when public guide frequency being used for channel quality indication calculation.
Embodiment one
This embodiment is described to the situation of the corresponding road public guide frequency in each cooperation cell, and specific implementation process is as follows:
(1) precoded pilot when each cooperation cell maps four cooperation cell according to Fig. 3 and Fig. 4, is described its emission pattern below.
Fig. 3 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four cooperation cell cooperations, as shown in Figure 3, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends, cooperation cell 4 is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that cooperation cell 4 sends.
Fig. 4 is under the long loop prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four cooperation cell cooperations, as shown in Figure 4, this frame structure shows 12 subcarriers, the public guide frequency that 12 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends, cooperation cell 4 is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that cooperation cell 4 sends.
In addition, if only have three cooperation cell, then only send three road public guide frequencies, below by way of Fig. 5 and Fig. 6, the emission pattern of public guide frequency during three cooperation cell is described.
Fig. 5 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three cooperation cell cooperations, as shown in Figure 5, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends.
Fig. 6 is under the long loop prefix frame structure according to the embodiment of the present invention one, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three cooperation cell cooperations, as shown in Figure 6, this frame structure shows 12 subcarriers, the public guide frequency that 12 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends.
That a road public guide frequency is described in the situation of the part time-domain position of Physical Resource Block below by way of Fig. 7 and Fig. 8 to sending the time-domain position of precoded pilot.
Fig. 7 is under the normal cyclic prefix frame structure according to the embodiment of the present invention one, portion of pilot is selected to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during four cooperation cell cooperations, as shown in Figure 7, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends, cooperation cell 4 is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that cooperation cell 4 sends.
Fig. 8 is under the long loop prefix frame structure according to the embodiment of the present invention one, portion of pilot is selected to carry out the schematic diagram of the mapping pattern of pilot tone and the Physical Resource Block sent during four cooperation cell cooperations, as shown in Figure 8, this frame structure shows 12 subcarriers, the public guide frequency that 12 OFDM symbol are corresponding, wherein, cooperation cell 1 is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that cooperation cell 1 sends, cooperation cell 2 is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that cooperation cell 2 sends, cooperation cell 3 is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that cooperation cell 3 sends, cooperation cell 4 is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that cooperation cell 4 sends.
It should be noted that, when cooperation cell 1 sends pilot tone, other cooperation cell does not send any signal at same time-frequency location.Similarly, when cooperation cell 2 sends pilot tone, other cooperation cell does not send any signal at same time-frequency location yet.The Regularia that this and each antenna port of the public guide frequency in 3GPPTS36.211 send seemingly.
(2) each community is by multiple antennas process, a frequency pilot sign is multiplied by multiple antennas process weights and is weighted process, and launch from many transmit antennas, the weights that this road public guide frequency carries out wave beam or precoding processing are identical with the weights that data carry out wave beam or precoding processing part.
Particularly, the frequency pilot sign i-th resource element launched is x
i(t), x
it () is the plural number of 1 × 1, the vector of weighting is w
i(t), w
it () is the column vector that M × 1 is tieed up, M is number of transmit antennas, then transmit as s
i(t)=x
i(t) * w
i(t), wherein, s
it () is the column vector that M × 1 is tieed up, corresponding M transmit antennas.
(3) call number of these multiple antennas process weights is fed back to mobile terminal by each community, that is, find immediate code book index number in the codebook or in predefined ripple book number, and this immediate code book index number is informed to mobile terminal.
(4) mobile terminal pilot tone pattern according to a preconcerted arrangement extracts pilot frequency information, and carries out data demodulates according to this pilot frequency information.
(5) precoded pilot after the multiple antennas process that obtains according to demodulation of mobile terminal and multiple antennas value information estimate real channel, and the instruction of feedback channel quality information.
Embodiment two
This embodiment is described to the situation often organizing the corresponding road public guide frequency in cooperation cell, and specific implementation process is as follows:
(1) divide into groups in participation cooperation cell by high level, and each group cooperation cell is mapped on the public guide frequency of a certain road, and grouping situation here comprises the situation of a group, two groups, three groups, four groups.
Below by way of Fig. 9 and Figure 10, the emission pattern of the public guide frequency (that is, above-mentioned precoded pilot) during four groups of cooperation cell is described.
Fig. 9 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four groups of cooperation cell cooperations, as shown in Figure 9, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that second group of cooperation cell sends, the 3rd group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that the 3rd group of cooperation cell sends, the 4th group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 4th group of cooperation cell sends.
Figure 10 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during four groups of cooperation cell cooperations, as shown in Figure 10, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that second group of cooperation cell sends, the 3rd group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that the 3rd group of cooperation cell sends, the 4th group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 4th group of cooperation cell sends.
Below by way of Figure 11 and Figure 12, the emission pattern of public guide frequency during two groups of cooperation cell is described.
Figure 11 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during two groups of cooperation cell cooperations, as shown in figure 11, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that second group of cooperation cell sends.
Figure 12 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during two groups of cooperation cell cooperations, as shown in figure 12, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 1st road public guide frequency, that is, R
1represent the public guide frequency that second group of cooperation cell sends.
Below by way of Figure 11 and Figure 12, the emission pattern of public guide frequency during one group of cooperation cell is described.
Figure 13 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during one group of cooperation cell cooperation, as shown in figure 13, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends.
Figure 14 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during one group of cooperation cell cooperation, as shown in figure 14, this frame structure shows 12 subcarriers, the public guide frequency that 14 OFDM symbol are corresponding, wherein, first group of cooperation cell is mapped on the 0th road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends.
During below by way of Figure 15 and Figure 16 to three groups of cooperation cell, for the corresponding multichannel public guide frequency in one group of cooperation cell, and the emission pattern of whole public guide frequency is adopted to be described.
Figure 15 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations, as shown in figure 15, first group of cooperation cell is mapped to the 0th tunnel respectively by different precoding weights, on 1st road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, R
1represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that second group of cooperation cell sends; 3rd group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 3rd group of cooperation cell sends.
Figure 16 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations, as shown in figure 16, first group of cooperation cell is mapped to the 0th tunnel respectively by different precoding weights, on 1st road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, R
1represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that second group of cooperation cell sends; 3rd group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 3rd group of cooperation cell sends.
During below by way of Figure 17 and Figure 18 to three groups of cooperation cell, for the corresponding multichannel public guide frequency in one group of cooperation cell, and the emission pattern of part public guide frequency is adopted to be described.
Figure 17 is under the normal cyclic prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations, as shown in figure 17, first group of cooperation cell is mapped to the 0th tunnel respectively by different precoding weights, on 1st road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, R
1represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that second group of cooperation cell sends; 3rd group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 3rd group of cooperation cell sends.
Figure 18 is under the long loop prefix frame structure according to the embodiment of the present invention two, the schematic diagram of the mapping pattern of pilot tone and Physical Resource Block during three groups of cooperation cell cooperations, as shown in figure 18, first group of cooperation cell is mapped to the 0th tunnel respectively by different precoding weights, on 1st road public guide frequency, that is, R
0represent the public guide frequency that first group of cooperation cell sends, R
1represent the public guide frequency that first group of cooperation cell sends, second group of cooperation cell is mapped on the 2nd road public guide frequency, that is, R
2represent the public guide frequency that second group of cooperation cell sends; 3rd group of cooperation cell is mapped on the 3rd road public guide frequency, that is, R
3represent the public guide frequency that the 3rd group of cooperation cell sends.
It should be noted that, when each group cooperation cell sends pilot tone, other are respectively organized cooperation cell and are not sent any signal in this position.The Regularia that this and each antenna port of the public guide frequency in 3GPP TS36.211 send seemingly.
(2) each group community is by multiple antennas process, a frequency pilot sign is multiplied by multiple antennas process weights and is weighted process, and launch from many transmit antennas, the weights that this road public guide frequency carries out wave beam or precoding processing and this group cooperation cell send data to carry out the weights of wave beam or precoding processing part identical.
Particularly, the frequency pilot sign i-th, this group cooperation cell resource element launched is x
it () is the plural number of 1 × 1, the vector of weighting is w
it (), be the column vector that M × 1 is tieed up, M is number of transmit antennas, then transmit as s
i(t)=x
i(t) * w
i(t), wherein, s
it () is the column vector that M × 1 is tieed up, corresponding M transmit antennas.
(3) call number of these multiple antennas process weights is fed back to mobile terminal by each community, that is, find immediate code book index number in the codebook or in predefined wave beam number, and this immediate code book index number is informed to mobile terminal.
(4) mobile terminal pilot tone pattern according to a preconcerted arrangement extracts pilot frequency information, and carries out data demodulates according to this pilot frequency information.
(5) precoded pilot after the multiple antennas process that obtains according to demodulation of mobile terminal and multiple antennas value information estimate real channel, and the instruction of feedback channel quality information.
Device embodiment
Embodiment one
According to embodiments of the invention, provide a kind of pilot tone processing unit.This pilot tone processing unit may be used for realizing above-mentioned pilot frequency processing method, can be arranged in above-mentioned cooperation cell.
Figure 19 is the structured flowchart of the pilot tone processing unit according to the embodiment of the present invention, and as shown in figure 19, this pilot tone processing unit comprises: processing module 2 and sending module 4, and wherein, processing module 2, for carrying out multiple antennas process to sent precoded pilot; Sending module 4, is connected to processing module 2, sends according to a road public guide frequency for the precoded pilot after processing module 2 is carried out multiple antennas process at the time-frequency location of Physical Resource Block.
Figure 20 is the concrete structure block diagram of the pilot tone processing unit according to the embodiment of the present invention, as shown in figure 20, this cooperation cell also comprises: feedback module 6, be connected to processing module 2, for multiple antennas disposal right value information is fed back to mobile terminal, wherein, the multiple antennas disposal right value information call number that is the multiple antennas process weights that carry out multiple antennas process and use or multiple antennas process weights; Processing module 2 is also for being multiplied by multiple antennas process weights by precoded pilot to be sent, and wherein, multiple antennas process weights are the weights that data carry out wave beam process or precoding processing part.
By this embodiment, provide when can be implemented in cooperative multipoint transmission the cooperation cell that pilot tone processes.
Embodiment two
According to embodiments of the invention, provide a kind of mobile terminal.This mobile terminal may be used for realizing above-mentioned pilot frequency processing method.
Figure 21 is the structured flowchart of the mobile terminal according to the embodiment of the present invention, as shown in figure 21, this mobile terminal comprises: receiver module 22, channel estimation module 24, wherein, receiver module 22, for receiving precoded pilot from cooperation cell and multiple antennas disposal right value information, wherein, precoded pilot to be sent is carried out multiple antennas process by cooperation cell, and multiple antennas disposal right value information is carry out the multiple antennas process weights of multiple antennas process or the call number of multiple antennas process weights; Channel estimation module 24, is connected to receiver module 22, carries out channel estimating for the precoded pilot received according to receiver module 22.
Figure 22 is the structured flowchart of the mobile terminal according to the embodiment of the present invention, as shown in figure 22, this mobile terminal also comprises: measurement module 28 and feedback module 26, wherein, measurement module 28, be connected to channel estimation module 24 and receiver module 22, for the channel estimation results measure channel quality information instruction that the multiple antennas disposal right value information that receives in conjunction with receiver module 22 and channel estimation module 24 obtain; Feedback module 26, is connected to measurement module 28, measure for feeding back measurement module 28 the channel quality information instruction obtained.
By this embodiment, provide when can be implemented in cooperative multipoint transmission the mobile terminal that pilot tone processes.
In sum, by the above embodiment of the present invention, the corresponding road public guide frequency in each community, can save pilot-frequency expense largely; By multiple antennas disposal right value information and the pilot signal received, the channel quality information instruction on full bandwidth can be obtained; In precoded pilot, carry wave beam process information, signaling feedback expense can be saved, and the multiple antennas process between multiple cooperation cell of being more convenient for; In addition, in the position of Physical Resource Block evenly, density is reasonable for public guide frequency, the channel estimating required for demodulation and channel quality information measurement can be completed simultaneously, because descending special pilot frequency can only as demodulation pilot frequency, therefore, the precoded pilot work after weighting is easier.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a pilot frequency processing method, is applied to the cooperative multicast system comprising multiple cooperation cell, it is characterized in that, described method comprises:
Each cooperation cell in described multiple cooperation cell, carries out multiple antennas process to sent precoded pilot, and is sent according to the time-frequency location of public guide frequency at Physical Resource Block by the described precoded pilot after multiple antennas process.
2. method according to claim 1, is characterized in that, the described precoded pilot after multiple antennas process is carried out transmission according to public guide frequency at the time-frequency location of Physical Resource Block and comprises by described each cooperation cell:
Described each cooperation cell, sends the described precoded pilot after multiple antennas process at the time-frequency location of Physical Resource Block according to a road public guide frequency.
3. method according to claim 1, is characterized in that, described multiple antennas process comprises:
Described precoded pilot to be sent is multiplied by multiple antennas process weights, and wherein, described multiple antennas process weights are the weights that data carry out wave beam process or precoding processing part.
4. method according to claim 3, is characterized in that, after the described precoded pilot after sending multiple antennas process, described method also comprises:
Multiple antennas disposal right value information is fed back to mobile terminal, and wherein, described multiple antennas disposal right value information comprises one of following: the call number of described multiple antennas process weights, described multiple antennas process weights.
5. method according to claim 4, is characterized in that, after described multiple antennas disposal right value information is fed back to described mobile terminal, described method also comprises:
Described mobile terminal carries out channel estimating according to the precoded pilot after the described multiple antennas process received, and measures and the instruction of feedback channel quality information in conjunction with described multiple antennas disposal right value information and channel estimation results.
6. method according to any one of claim 1 to 4, it is characterized in that, described multiple cooperation cell is multiple cooperation cell groups, each cooperation cell group comprises one or more cooperation cell, and each cooperation cell in the group of same cooperation cell adopts identical processing mode to precoded pilot.
7. method according to any one of claim 1 to 4, is characterized in that, the position mapping described precoded pilot is that a described road public guide frequency is in whole positions of Physical Resource Block.
8. method according to any one of claim 1 to 4, is characterized in that, the position mapping described precoded pilot is the portion of a described road public guide frequency at Physical Resource Block.
9. method according to any one of claim 1 to 4, is characterized in that, the position mapping described precoded pilot is the whole positions of described multichannel public guide frequency at Physical Resource Block.
10. method according to any one of claim 1 to 4, is characterized in that, the position mapping described precoded pilot is the portion of described multichannel public guide frequency at Physical Resource Block.
11. 1 kinds of pilot tone processing unit, is characterized in that, comprising:
Processing module, for carrying out multiple antennas process to sent precoded pilot;
Sending module, sends according to the time-frequency location of public guide frequency at Physical Resource Block for the described precoded pilot after described processing module is carried out multiple antennas process.
12. devices according to claim 11, is characterized in that, also comprise:
Feedback module, for multiple antennas disposal right value information is fed back to mobile terminal, wherein, the call number that described multiple antennas disposal right value information is the multiple antennas process weights that carry out multiple antennas process and use or described multiple antennas process weights.
13. 1 kinds of mobile terminals, is characterized in that, comprising:
Receiver module, for receiving precoded pilot from cooperation cell and multiple antennas disposal right value information, wherein, precoded pilot to be sent is carried out multiple antennas process by described cooperation cell, and described multiple antennas disposal right value information is carry out the multiple antennas process weights of multiple antennas process or the call number of described multiple antennas process weights;
Channel estimation module, carries out channel estimating for the described precoded pilot received according to described receiver module.
14. mobile terminals according to claim 13, is characterized in that, also comprise:
Measurement module, for the channel estimation results measure channel quality information instruction obtained in conjunction with described multiple antennas disposal right value information and described channel estimation module;
Feedback module, for feeding back the described channel quality information instruction that described measurement module measurement obtains.
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| CN200910006248.8A CN101800589B (en) | 2009-02-06 | 2009-02-06 | Pilot frequency processing method, device and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1701554A (en) * | 2002-09-20 | 2005-11-23 | 北方电讯网络有限公司 | Space-time codes with incremental redundancy |
| WO2007091836A1 (en) * | 2006-02-09 | 2007-08-16 | Samsung Electronics Co., Ltd. | Method and system for scheduling users based on user-determined ranks in a mimo system |
| WO2008055179A2 (en) * | 2006-10-31 | 2008-05-08 | Qualcomm Incorporated | Unified design and centralized scheduling for dynamic simo, su-mimo and mu-mimo operation for rl transmissions |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1701554A (en) * | 2002-09-20 | 2005-11-23 | 北方电讯网络有限公司 | Space-time codes with incremental redundancy |
| WO2007091836A1 (en) * | 2006-02-09 | 2007-08-16 | Samsung Electronics Co., Ltd. | Method and system for scheduling users based on user-determined ranks in a mimo system |
| WO2008055179A2 (en) * | 2006-10-31 | 2008-05-08 | Qualcomm Incorporated | Unified design and centralized scheduling for dynamic simo, su-mimo and mu-mimo operation for rl transmissions |
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