CN102158292B - Channel measurement pilot frequency sending method and base station - Google Patents
Channel measurement pilot frequency sending method and base station Download PDFInfo
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- CN102158292B CN102158292B CN201010120053.9A CN201010120053A CN102158292B CN 102158292 B CN102158292 B CN 102158292B CN 201010120053 A CN201010120053 A CN 201010120053A CN 102158292 B CN102158292 B CN 102158292B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Abstract
The invention discloses a kind of channel measurement pilot frequency sending method and base station.Wherein, the method comprises: base station side is in its each antenna port periodically transmitting channel measurement pilot frequency, wherein, this channel measurement pilot frequency on average takies m resource element on each Resource Block, and within each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m be the quantity of the antenna port of base station side.By the present invention, the performance of channel measurement can be ensured, improve LTE-Advance throughput of system.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of channel measurement pilot frequency sending method and base station.
Background technology
In order to improve the throughput of community, carry out the interference coordination of minizone, new generation of wireless way system, such as, advanced long-term evolution system (Long-TermEvolutionadvance, referred to as LTE-Advance), senior international wireless communication system IMT-Advance (InternationalMobileTelecommunicationadvance, referred to as IMT-Advance) etc. all introduce cooperation transmission technology (CoordinateMultipointTransmissionandReception, referred to as COMP) between network level.
Defined two kinds of pilot tones of LTE-Advanced in 3GPPLTE56 meeting: channel measurement pilot frequency (referred to as CSI-RS) and demodulation pilot frequency (referred to as DMRS).Wherein, demodulation pilot frequency is cell-specific (cell-specific), and channel measurement pilot frequency, for measuring channel parameter, distributes more sparse relative to demodulation pilot frequency on running time-frequency resource.
But how definition does not send CSI-RS in correlation technique, thus makes to apply CSI-RS in LTE-Advanced, and then CSI-RS cannot be utilized to measure channel parameter.
Summary of the invention
Main purpose of the present invention is to provide a kind of channel measurement pilot frequency sending method, at least to solve the problem.
According to an aspect of the present invention, provide a kind of channel measurement pilot frequency sending method, comprise: base station side is in its each antenna port periodically transmitting channel measurement pilot frequency, wherein, this channel measurement pilot frequency on average takies m resource element on each Resource Block, and within each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m be the quantity of the antenna port of base station side.
Further, base station side transmitting channel measurement pilot frequency comprises: base station side avoids the resource element transmitting channel measurement pilot frequency shared by predetermined information, wherein, predetermined information comprises: the descending special pilot frequency of front two-way public guide frequency, Release8, the demodulation pilot frequency of Release9/10, Physical Broadcast Channel, physical control channel, synchronizing signal and paging channel.
Further, for time division duplex frame structure and frequency division frame duplex structure, base station side adopts identical mapping method transmitting channel measurement pilot frequency.
Further, base station side is one of in the following ways in each antenna port transmitting channel measurement pilot frequency: time division multiplexing, frequency division multiplexing, time division multiplexing add frequency division multiplexing.
Further, in each transmission cycle, channel measurement pilot frequency comprises m road, m=2,4 or 8, as m=2, the pattern of m path channels measurement pilot frequency is identical with the pattern of front two-way channel measurement pilot frequency during m=4, as m=4, the pattern of m path channels measurement pilot frequency is identical with the pattern of front 4 path channels measurement pilot frequency during m=4.
Further, as m=8, the pattern of 8 path channels measurement pilot frequency is: 4 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j)≤N, N comprises for a Resource Block.
Preferably, j=6.
Further, as m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+2)≤N, N comprises for a Resource Block.
Preferably, j=5.
Further, as m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j)≤N, N comprises for a Resource Block.
Preferably, j=3.
Further, as m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbol taking a Resource Block in 2 two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+j+1) individual subcarrier, (k+j+2) individual subcarrier, (k+2j+2) individual subcarrier, (k+2j+3) individual subcarrier, (k+3j+3) individual subcarrier and (k+3j+4), wherein, k and j is natural number, and (2k+3j+4)≤N, the sum of the subcarrier that N comprises for a Resource Block.
Preferably, j=2.
Further, as m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbol taking a Resource Block in 2 two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+2) individual subcarrier, (k+3) individual subcarrier, (k+j+3) individual subcarrier, (k+j+4) individual subcarrier, (k+j+5) and (k+j+6) individual subcarrier, wherein, k and j is natural number, and (2k+j+6)≤N, the sum of the subcarrier that N comprises for a Resource Block.
Preferably, j=5.
According to a further aspect in the invention, provide a kind of base station, for in its each antenna port periodically transmitting channel measurement pilot frequency, wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and within each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m be the quantity of the antenna port of base station.
Pass through the present invention, base station side on average takies a resource element transmitting channel measurement pilot frequency on each Resource Block of each antenna port, solve in correlation technique the problem not defining how transmitting channel measurement pilot frequency, and then the performance degradation reduced LTE user, and design overhead is low, thus the performance of channel measurement can be ensured, improve LTE-Advance throughput of system.
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 according to the base station of the embodiment of the present invention schematic diagram to terminal transmitting channel measurement pilot frequency;
Fig. 2 is public guide frequency and the descending special pilot frequency pattern of normal cyclic prefix frame structure in LTE standard;
Fig. 3 is the flow chart of the sending method of channel measurement pilot frequency according to the embodiment of the present invention;
Fig. 4 is the channel measurement pilot frequency pattern according to the embodiment of the present invention one;
Fig. 5 is the channel measurement pilot frequency pattern according to the embodiment of the present invention two;
Fig. 6 is the channel measurement pilot frequency pattern according to the embodiment of the present invention three;
Fig. 7 is the channel measurement pilot frequency pattern according to the embodiment of the present invention four;
Fig. 8 is the channel measurement pilot frequency pattern according to the embodiment of the present invention five;
Fig. 9 is the channel measurement pilot frequency pattern according to the embodiment of the present invention six.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Below the base station according to the embodiment of the present invention is described.
Fig. 1 is according to the base station of the embodiment of the present invention schematic diagram to terminal transmitting channel measurement pilot frequency, in embodiments of the present invention, base station is used in its each antenna port periodically transmitting channel measurement pilot frequency (CSI-RS), and wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and within each transmission cycle, channel measurement pilot frequency takies n OFDM (OFDM) symbol, n=1,2,4, m is the quantity of the antenna port of base station side.
By the base station that the embodiment of the present invention provides, because channel measurement pilot frequency on average only occupies a resource element on each antenna port, each Resource Block, therefore, the transmission of sparse channel measurement pilot frequency can be realized, thus the performance degradation reduced LTE user, and the performance of channel measurement can be ensured, improve throughput of system.
In specific implementation process, in order to ensure the transmission of LTE system CRS, reduce the impact on LTE user, improve high-order multiple-input and multiple-output (MIMO) and the pilot frequency information needed for CoMP, CSI-RS should avoid front two-way public guide frequency (CRS), the demodulation pilot frequency (DMRS) of Release (version) 9/l0, the descending special pilot frequency (URS) of Release8, Physical Broadcast Channel (PBCH), physical control channel (PDCCH), the mapping position of synchronizing signal and paging channel, and CSI-RS should avoid front two-way public guide frequency (CRS), the mapping symbols that PDCCH and URS takies, Fig. 2 is public guide frequency according to LTE standard normal cyclic prefix frame structure and descending special pilot frequency pattern, these positions should be avoided when channel measurement pilot frequency maps.
Below the channel measurement pilot frequency sending method according to the embodiment of the present invention is described.
Fig. 3 is the flow chart of the channel measurement pilot frequency sending method according to the embodiment of the present invention, and as shown in Figure 3, the method mainly comprises the following steps (step S302-step S304):
Step S302: base station side is in each antenna port periodically transmitting channel measurement pilot frequency, wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and within each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m be the quantity of the antenna port of base station side;
In specific implementation process, base station side can take m resource element transmitting channel measurement pilot frequency on each Resource Block, also can with two Resource Block for predetermined group unit, take 2 × m resource element transmitting channel measurement pilot frequency of one of them Resource Block, and do not take the resource element of another Resource Block, or, also can with three Resource Block for predetermined group unit, do not need to limit which resource element specifically taking which Resource Block, as long as average each Resource Block only takies m resource element.
Step S304: terminal receives the channel measurement pilot frequency that base station side sends, and carries out channel parameter estimation according to channel measurement pilot frequency.
By the said method that the embodiment of the present invention provides, base station side can adopt comparatively sparse mode transmitting channel measurement pilot frequency, thus can reduce the performance degradation to LTE user, ensures the performance of channel measurement, improves the throughput of LTE system.
In specific implementation process, the mapping position of URS and PBCH, the PDCCH of DMRS, Release8 of base station side two-way CRS, LTERelease9/10 before sending CSI-RS and should avoiding, synchronizing signal and paging channel.And CSI-RS should avoid front two-way public guide frequency (CRS), the mapping symbols that PDCCH and URS takies.
CSI-RS is sent by the mapping symbols avoiding URS, CRS and PDCCH etc., the information such as the CRS of LTE system can be kept to send, reduce and send CSI-RS to the impact of LTE user, and the pilot frequency information provided needed for high-order mimo and COMP, be conducive to LTE-Advanced user and improve single-link quality.
In order to ensure time division duplex (TimeDivisionDuplexing, referred to as TDD) frame structure and Frequency Division Duplexing (FDD) (FrequencyDivisionDuplexing, referred to as FDD) frame structure carries out CoMP, and the channel measurement pilot frequency of tdd frame structure community should adopt consistent configurations and reuse plan with the channel measurement pilot frequency of FDD frame structure community.In embodiments of the present invention, for time division duplex (TDD) frame structure and Frequency Division Duplexing (FDD) structure, base station side adopts the mapping method transmitting channel measurement pilot frequency of homophase, and namely the pattern of base station transmission CSI-RS can make FDD frame structure adopt consistent reuse plan with tdd frame structure.
Owing to fixing relative to CSI-RS frequency domain position, therefore, this bright embodiment can support more community CoMP participating, improves systematic function.
In specific implementation process, base station side is when each antenna port sends CSI-RS, the orthogonal mode of time division multiplexing (TDM) can be adopted to send, also the orthogonal mode of frequency division multiplexing (FDM) can be adopted to send, or, the orthogonal mode of TDM+FDM also can be adopted to send.Thus the mutual interference of the CSI-RS that multiple antenna port can be avoided to send.
In specific implementation process, antenna port quantity for base station side is different, in each transmission cycle, base station side will send m path channels measurement pilot frequency, particularly, m=2,4 or 8, as m=2, the pattern of 2 path channels measurement pilot frequency is identical with the pattern of front two-way channel measurement pilot frequency during m=4, as m=4, the pattern of 4 path channels measurement pilot frequency is identical with the pattern of front 4 path channels measurement pilot frequency during m=4.
As m=8, the pattern of base station side transmitting channel measurement pilot frequency includes but not limited to following several types:
1, take 4 OFDM symbol of a Resource Block, for each OFDM symbol, take a kth subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j)≤N, N comprises for a Resource Block;
Preferably, above-mentioned j=6.
2, take 2 OFDM symbol of a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+2)≤N, N comprises for a Resource Block.
Preferably, j=5.
3, take 2 OFDM symbol of a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j)≤N, N comprises for a Resource Block;
Preferably, j=3.
4, take 2 OFDM symbol of a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+j+1) individual subcarrier, (k+j+2) individual subcarrier, (k+2j+2) individual subcarrier, (k+2j+3) individual subcarrier, (k+3j+3) individual subcarrier and (k+3j+4), wherein, k and j is natural number, and the sum of subcarrier that (2k+3j+4)≤N, N comprises for a Resource Block.
Preferably, j=2.
5, take 2 OFDM symbol of a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+2) individual subcarrier, (k+3) individual subcarrier, (k+j+3) individual subcarrier, (k+j+4) individual subcarrier, (k+j+5) and (k+j+6) individual subcarrier, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+6)≤N, N comprises for a Resource Block.
Preferably, j=5.
For understanding the technical scheme that the embodiment of the present invention provides further, below for LTE-Advance system, the specific embodiment of the transmission pattern of 8 path channels measurement pilot frequency is described.
Embodiment one
Fig. 4 is that in the present embodiment, CSI-RS repeats the pattern sent with certain cycle, and in the present embodiment, the CSI-RS in each cycle takies a subframe and is sent completely.
In the present embodiment, the pilot tone frequency domain of the CSI-RS that each road antenna port sends is spaced apart 12 subcarriers, and on the full bandwidth of frequency domain shared by CSI-RS transmission subframe LTE-A, each Resource Block (RB) repeats the pattern shown in Fig. 4.
As shown in Figure 4, in the present embodiment, channel measurement pilot frequency is with a RB for predetermined composition unit repeats to send at full bandwidth at equal intervals, and 8 road CSI-RS lay respectively in 2 OFDM symbol of send subframe the 6th, 9,11,14.Wherein, 0 path channels measurement pilot frequency is mapped on the 9th subcarrier of the 14th symbol, 1 path channels measurement pilot frequency is mapped on the 9th subcarrier of the 11st symbol, 2 path channels measurement pilot frequency are mapped on the 9th subcarrier of the 9th symbol, 3 path channels measurement pilot frequency are mapped on the 9th subcarrier of the 6th symbol, 4 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 14th symbol, 5 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 11st symbol, 6 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 9th symbol, 7 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 6th symbol.Keeping under the prerequisite that time-frequency interval is constant, the mapping order of the initial position antenna port of this pattern can adjust flexibly.
It should be noted that, as long as ensure that subcarrier spacing is 12, then the running time-frequency resource position shared by the CSI-RS of each road can be exchanged mutually.
Embodiment two
As shown in Figure 5, in the present embodiment, channel measurement pilot frequency is with a RB for predetermined composition unit repeats to send at full bandwidth at equal intervals, and 8 road CSI-RS lay respectively in 2 OFDM symbol of send subframe the 6th, 9,11,14.Wherein, 0 path channels measurement pilot frequency is mapped on the 4th subcarrier of the 6th symbol, 1 path channels measurement pilot frequency is mapped on the 1st subcarrier of the 9th symbol, 2 path channels measurement pilot frequency are mapped on the 1st subcarrier of the 11st symbol, 3 path channels measurement pilot frequency are mapped on the 4th subcarrier of the 14th symbol, 4 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 6th symbol, 5 path channels measurement pilot frequency are mapped on the 7th subcarrier of the 9th symbol, 6 path channels measurement pilot frequency are mapped on the 7th subcarrier of the 11st symbol, 7 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 14th symbol.Keeping under the prerequisite that time-frequency interval is constant, the mapping order of the initial position antenna port of this pattern can adjust flexibly.
Embodiment three
In the present embodiment, 8 road CSI-RS repeated to send the pattern shown in Fig. 5 with certain cycle, and in each cycle, CSI-RS takies a subframe transmission.
In the present embodiment, the pilot tone frequency domain of the CSI-RS that each road antenna port sends is spaced apart 12 subcarriers, and each RB sent at CSI-RS on the full bandwidth of frequency domain shared by subframe LTE-A repeats the pattern shown in Fig. 6.
As shown in Figure 6, channel measurement pilot frequency with a RB for predetermined composition unit full bandwidth repeat at equal intervals send, 8 tunnels are positioned at and send the 9th of subframe, in 11 OFDM symbol, wherein, 0 path channels measurement pilot frequency is mapped on the 10th subcarrier of the 11st symbol, 1 path channels measurement pilot frequency is mapped on the 4th subcarrier of the 11st symbol, 2 path channels measurement pilot frequency are mapped on the 9th subcarrier of the 11st symbol, 3 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 11st symbol, 4 path channels measurement pilot frequency are mapped on the 9th subcarrier of the 9th symbol, 5 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 9th symbol, 6 path channels measurement pilot frequency are mapped on the 4th subcarrier of the 9th symbol, 7 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 9th symbol.Keeping under the prerequisite that time-frequency interval is constant, the mapping order of the initial position antenna port of this pattern can adjust flexibly.
It should be noted that, in embodiments of the present invention, as long as ensure that subcarrier spacing is 12, the running time-frequency resource position shared by the CSI-RS of each road can be exchanged mutually.
Embodiment four
As shown in Figure 7, in the present embodiment, channel measurement pilot frequency with a RB for predetermined composition unit full bandwidth repeat at equal intervals send, 8 tunnels are positioned at and send the 9th of subframe, in 11 OFDM symbol, wherein, 0 path channels measurement pilot frequency is mapped on the 1st subcarrier of the 9th symbol, 1 path channels measurement pilot frequency is mapped on the 1st subcarrier of the 11st symbol, 2 path channels measurement pilot frequency are mapped on the 7th subcarrier of the 9th symbol, 3 path channels measurement pilot frequency are mapped on the 7th subcarrier of the 11st symbol, 4 path channels measurement pilot frequency are mapped on the 4th subcarrier of the 9th symbol, 5 path channels measurement pilot frequency are mapped on the 4th subcarrier of the 11st symbol, 6 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 9th symbol, 7 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 11st symbol.Keeping under the prerequisite that time-frequency interval is constant, the mapping order of the initial position antenna port of this pattern can adjust flexibly.
Embodiment five
In the present embodiment, 4 roads or 8 road CSI-RS repeated to send the pattern shown in Fig. 8 with certain cycle, and in each cycle, CSI-RS takies a subframe transmission.
In the present embodiment, the frequency domain interval of each map unit of CSI-RS is 24 subcarriers, and every two RB sent at CSI-RS on the full bandwidth of frequency domain shared by sub-LTE-A repeat the pattern shown in Fig. 8.
As shown in Figure 8, channel measurement pilot frequency with two RB for predetermined composition unit repeats intervally to send the whole frequency domain resource of LTE-A is first-class, 8 path channels measurement pilot frequency lay respectively at and send the 9th of subframe, in 11 OFDM symbol, wherein, 1st path channels measurement pilot frequency is mapped on the 12nd subcarrier of the 9th symbol and the 4th subcarrier of the 11st symbol, 2nd path channels measurement pilot frequency is mapped on the 4th subcarrier of the 9th symbol and the 12nd subcarrier of the 11st symbol, 3rd path channels measurement pilot frequency is mapped on the 11st subcarrier of the 9th symbol and the 3rd subcarrier of the 11st symbol, 4th path channels measurement pilot frequency is mapped on the 3rd subcarrier of the 9th symbol and the 11st subcarrier of the 11st symbol, 5th path channels measurement pilot frequency is mapped on the 10th subcarrier of the 9th symbol and the 2nd subcarrier of the 11st symbol, 6th path channels measurement pilot frequency is mapped on the 2nd subcarrier of the 9th symbol and the 10th subcarrier of the 11st symbol, 7th path channels measurement pilot frequency is mapped on the 9th subcarrier of the 9th symbol and the 1st subcarrier of the 11st symbol, and the 8th path channels measurement pilot frequency is mapped on the 1st subcarrier of the 9th symbol and the 9th subcarrier of the 11st symbol.Keeping under the prerequisite that time-frequency interval is constant, the initial position of this pattern and the mapping order of antenna port can adjust flexibly.It should be noted that, in the present embodiment, as long as ensure that subcarrier spacing is 6, then the running time-frequency resource position shared by the CSI-RS of each road also can be exchanged mutually.
Embodiment six
As shown in Figure 9, in the present embodiment, channel measurement pilot frequency with two RB for predetermined composition unit repeats intervally to send the whole frequency domain resource of LTE-A is first-class, 8 path channels measurement pilot frequency lay respectively at and send the 9th of subframe, in 11 OFDM symbol, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+j+1) individual subcarrier, (k+j+2) individual subcarrier, (k+2j+2) individual subcarrier, (k+2j+3) individual subcarrier, (k+3j+3) individual subcarrier and (k+3j+4), wherein, k and j is natural number, and (2k+3j+4)≤N, the sum of the subcarrier that N comprises for a Resource Block, here j=2, namely, for each OFDM symbol, 8 path channels measurement pilot frequency occupy the 1st respectively, 2, 4, 5, 7, 8, 10, 11 subcarriers.Keeping under the prerequisite that time-frequency interval is constant, the mapping order of the initial position antenna port of this pattern can adjust flexibly.
In sum, by the present invention, maintain LTE system CRS and send, very little to LTE customer impact, and provide the pilot frequency information needed for high-order mimo and COMP, be conducive to LTE-Advanced user and improve single-link quality.In addition, owing to have employed more sparse design, reduce the performance degradation to LTE user, and design overhead is low, the performance of channel measurement can be ensured, lte-a system throughput can be improved.Further, in embodiments of the present invention, fix relative to CSI-RS frequency domain position, therefore, more community CoMP participating can be supported, improve systematic function.
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, and in some cases, step shown or described by can performing with the order be different from herein, 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 (8)
1. a channel measurement pilot frequency sending method, is characterized in that, comprising:
Base station side is in its each antenna port periodically transmitting channel measurement pilot frequency, wherein, the average each Resource Block of described channel measurement pilot frequency takies m resource element, and within each transmission cycle, described channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m be the quantity of the antenna port of described base station side;
Wherein, in each transmission cycle, described channel measurement pilot frequency comprises m road, described m=2,4 or 8, as m=2, the pattern of channel measurement pilot frequency described in m road is identical with the pattern of front two-way channel measurement pilot frequency during m=4, as m=8, the pattern of channel measurement pilot frequency described in m road is identical with the pattern of front 4 path channels measurement pilot frequency during m=4;
Wherein, as m=8, the pattern of 8 path channels measurement pilot frequency is:
Pattern 1: 4 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j)≤N, N comprises for a Resource Block; Or,
Pattern 2: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+2)≤N, N comprises for a Resource Block, described j=5; Or,
Pattern 3: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j)≤N, N comprises for a Resource Block, described j=3; Or,
Pattern 4: 2 OFDM symbol taking a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+j+1) individual subcarrier, (k+j+2) individual subcarrier, (k+2j+2) individual subcarrier, (k+2j+3) individual subcarrier, (k+3j+3) individual subcarrier and (k+3j+4) individual subcarrier, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j+4)≤N, N comprises for a Resource Block; Or,
Pattern 5: 2 OFDM symbol taking a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+2) individual subcarrier, (k+3) individual subcarrier, (k+j+3) individual subcarrier, (k+j+4) individual subcarrier, (k+j+5) and (k+j+6) individual subcarrier, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+6)≤N, N comprises for a Resource Block.
2. method according to claim 1, it is characterized in that, described base station side sends described channel measurement pilot frequency and comprises: the described base station side resource element avoided shared by predetermined information sends described channel measurement pilot frequency, wherein, described predetermined information comprises: the descending special pilot frequency of front two-way public guide frequency, Release8, the demodulation pilot frequency of Release9/10, Physical Broadcast Channel, physical control channel, synchronizing signal and paging channel.
3. method according to claim 1, is characterized in that, for time division duplex frame structure and frequency division frame duplex structure, described base station side adopts identical mapping method to send described channel measurement pilot frequency.
4. according to the method in any one of claims 1 to 3, it is characterized in that, described base station side one of in the following ways sends described channel measurement pilot frequency at each antenna port: time division multiplexing, frequency division multiplexing, time division multiplexing add frequency division multiplexing.
5. method according to claim 1, is characterized in that, in described pattern 1, and described j=6.
6. method according to claim 1, is characterized in that, in described pattern 4, and described j=2.
7. method according to claim 1, is characterized in that, in described pattern 5, and described j=5.
8. a base station, it is characterized in that, described base station is used in its each antenna port periodically transmitting channel measurement pilot frequency, wherein, the average each Resource Block of described channel measurement pilot frequency takies m resource element, and within each transmission cycle, described channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1, and 2 or 4, m is the quantity of the antenna port of described base station, m and n is natural number;
Wherein, in each transmission cycle, described channel measurement pilot frequency comprises m road, described m=2,4 or 8, as m=2, the pattern of channel measurement pilot frequency described in m road is identical with the pattern of front two-way channel measurement pilot frequency during m=4, as m=8, the pattern of channel measurement pilot frequency described in m road is identical with the pattern of front 4 path channels measurement pilot frequency during m=4;
Wherein, as m=8, the pattern of 8 path channels measurement pilot frequency is:
Pattern 1: 4 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j)≤N, N comprises for a Resource Block; Or,
Pattern 2: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+2)≤N, N comprises for a Resource Block, described j=5; Or,
Pattern 3: 2 OFDM symbol taking a Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier respectively, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j)≤N, N comprises for a Resource Block, described j=3; Or,
Pattern 4: 2 OFDM symbol taking a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+j+1) individual subcarrier, (k+j+2) individual subcarrier, (k+2j+2) individual subcarrier, (k+2j+3) individual subcarrier, (k+3j+3) individual subcarrier and (k+3j+4) individual subcarrier, wherein, k and j is natural number, and the sum of subcarrier that (2k+3j+4)≤N, N comprises for a Resource Block; Or,
Pattern 5: 2 OFDM symbol taking a Resource Block in two Resource Block, for each OFDM symbol, take a kth subcarrier of this OFDM symbol, (k+1) individual subcarrier, (k+2) individual subcarrier, (k+3) individual subcarrier, (k+j+3) individual subcarrier, (k+j+4) individual subcarrier, (k+j+5) and (k+j+6) individual subcarrier, wherein, k and j is natural number, and the sum of subcarrier that (2k+j+6)≤N, N comprises for a Resource Block.
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| CN103391573B (en) * | 2012-05-07 | 2016-08-10 | 华为技术有限公司 | The measuring method of a kind of downlink channel condition information, device and subscriber equipment |
| CN103517313B (en) * | 2012-06-21 | 2016-10-05 | 中国移动通信集团设计院有限公司 | A kind of method and apparatus detecting interference signal |
| CN112615706B (en) * | 2016-01-15 | 2022-08-19 | 中兴通讯股份有限公司 | Signal sending method, signal receiving method and device |
| CN107370582A (en) * | 2016-05-12 | 2017-11-21 | 株式会社Ntt都科摩 | reference signal sending method, detection method, base station and mobile station |
| CN109687946B (en) * | 2017-05-05 | 2020-03-10 | 华为技术有限公司 | Transmission method and device for reference signal pattern |
| CN111988074A (en) * | 2019-05-24 | 2020-11-24 | 普天信息技术有限公司 | Downlink pilot frequency method and base station |
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