CN102158292A - Method for transmitting channel measurement pilot frequency and base station - Google Patents
Method for transmitting channel measurement pilot frequency and base station Download PDFInfo
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- CN102158292A CN102158292A CN2010101200539A CN201010120053A CN102158292A CN 102158292 A CN102158292 A CN 102158292A CN 2010101200539 A CN2010101200539 A CN 2010101200539A CN 201010120053 A CN201010120053 A CN 201010120053A CN 102158292 A CN102158292 A CN 102158292A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
Abstract
The invention discloses a method for transmitting channel measurement pilot frequency and a base station. The method comprises the following steps: a base station side periodically transmits channel measurement pilot frequency at various antenna ports; the channel measurement pilot frequency occupies m resource elements on each resource block on average and occupies n OFDM (Orthogonal Frequency Division Multiplexing) signs in each transmitting period, wherein n is equal to 1,2 or 4, m is the number of antenna ports at the base station side. By means of the invention, channel measurement performance can be ensured and throughput of an LTE-Advance (Long Term Evolution) system can be improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of channel measurement pilot frequency sending method and base station.
Background technology
In order to improve the throughput of sub-district, carry out the interference coordination of minizone, the new generation of wireless way system, for example, advanced long-term evolution system (Long-Term Evolution advance, abbreviate LTE-Advance as), senior international wireless communication system IMT-Advance (International Mobile Telecommunication advance, abbreviate IMT-Advance as) etc. all introduce cooperation transmission technology (CoordinateMultipoint Transmission and Reception abbreviates COMP as) between network level.
Two kinds of pilot tones of LTE-Advanced in LTE56 meeting of 3GPP, have been defined: channel measurement pilot frequency (abbreviating CSI-RS as) and demodulation pilot frequency (abbreviating DMRS as).Wherein, demodulation pilot frequency is cell-specific (cell-specific), and channel measurement pilot frequency is used for the measured channel parameter, distributes more sparse on running time-frequency resource with respect to demodulation pilot frequency.
But, in the correlation technique not definition how to send CSI-RS, thereby make and can't in LTE-Advanced, use CSI-RS, and then can't utilize CSI-RS measured channel parameter.
Summary of the invention
Main purpose of the present invention is to provide a kind of channel measurement pilot frequency sending method, to address the above problem at least.
According to an aspect of the present invention, a kind of channel measurement pilot frequency sending method is provided, comprise: base station side is in its each antenna port transmitting channel measurement pilot frequency periodically, wherein, this channel measurement pilot frequency on average takies m resource element on each Resource Block, and in each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m is the quantity of the antenna port of base station side.
Further, base station side transmitting channel measurement pilot frequency comprises: base station side is avoided the shared resource element transmitting channel measurement pilot frequency of predetermined information, wherein, predetermined information comprises: the descending special pilot frequency of preceding 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 the m road, m=2,4 or 8, when m=2, the pattern of the preceding two-way channel measurement pilot frequency of the pattern of m path channels measurement pilot frequency during with m=4 is identical, when m=4, the pattern of the preceding 4 path channels measurement pilot frequency of the pattern of m path channels measurement pilot frequency during with m=4 is identical.
Further, when m=8, the pattern of 8 path channels measurement pilot frequency is: 4 OFDM symbols that take a Resource Block, for each OFDM symbol, take k subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+j)≤and N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=6.
Further, when m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbols that take a Resource Block, for each OFDM symbol, take k subcarrier, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+j+2)≤and N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=4.
Further, when m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbols that take a Resource Block, for each OFDM symbol, take k subcarrier, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+3j)≤and N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=2.
Further, when m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbols that take a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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) of this OFDM symbol, wherein, k and j are natural number, and (2k+3j+4)≤and N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=1.
Further, when m=8, the pattern of 8 path channels measurement pilot frequency is: 2 OFDM symbols that take a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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 of this OFDM symbol, wherein, k and j are natural number, and (2k+j+6)≤and N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=4.
According to a further aspect in the invention, a kind of base station is provided, be used in its each antenna port transmitting channel measurement pilot frequency periodically, wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and in each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m is the quantity of the antenna port of base station.
By 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, solved the problem of transmitting channel measurement pilot frequency that how not define in the correlation technique, and then reduced performance degradation to LTE user, and design overhead is low, thereby can guarantee the performance of channel measurement, improve the LTE-Advance throughput of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is according to the base station of the embodiment of the invention schematic diagram to terminal transmitting channel measurement pilot frequency;
Fig. 2 is the public guide frequency and the descending special pilot frequency pattern of the normal cyclic prefix frame structure in the LTE standard;
Fig. 3 is the flow chart according to the sending method of the channel measurement pilot frequency of the embodiment of the invention;
Fig. 4 is the channel measurement pilot frequency pattern according to the embodiment of the invention one;
Fig. 5 is the channel measurement pilot frequency pattern according to the embodiment of the invention two;
Fig. 6 is the channel measurement pilot frequency pattern according to the embodiment of the invention three;
Fig. 7 is the channel measurement pilot frequency pattern according to the embodiment of the invention four;
Fig. 8 is the channel measurement pilot frequency pattern according to the embodiment of the invention five;
Fig. 9 is the channel measurement pilot frequency pattern according to the embodiment of the invention six.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Below the base station according to the embodiment of the invention is described.
Fig. 1 is according to the base station of the embodiment of the invention schematic diagram to terminal transmitting channel measurement pilot frequency, in embodiments of the present invention, the base station is used in its each antenna port transmitting channel measurement pilot frequency (CSI-RS) periodically, and wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and in 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.
The base station that provides by the embodiment of the invention, because channel measurement pilot frequency has on average only taken a resource element on each antenna port, each Resource Block, therefore, can realize the transmission of sparse channel measurement pilot frequency, thereby reduced performance degradation to LTE user, and can guarantee the performance of channel measurement, improve throughput of system.
In specific implementation process, in order to guarantee the transmission of the CRS of LTE system, minimizing is to LTE user's influence, improve high-order multiple-input and multiple-output (MIMO) and the required pilot frequency information of CoMP, CSI-RS should avoid preceding two-way public guide frequency (CRS), the demodulation pilot frequency (DMRS) of Release (version) 9/10, the descending special pilot frequency of Release8 (URS), Physical Broadcast Channel (PBCH), physical control channel (PDCCH), the mapping position of synchronizing signal and paging channel, and CSI-RS should avoid preceding two-way public guide frequency (CRS), the mapping symbols that PDCCH and URS take, Fig. 2 is public guide frequency and the descending special pilot frequency pattern according to LTE standard normal cyclic prefix frame structure, should avoid these positions during the channel measurement pilot frequency mapping.
Below the channel measurement pilot frequency sending method according to the embodiment of the invention is described.
Fig. 3 is the flow chart according to the channel measurement pilot frequency sending method of the embodiment of the invention, and as shown in Figure 3, this method mainly may further comprise the steps (step S302-step S304):
Step S302: base station side is in each antenna port transmitting channel measurement pilot frequency periodically, wherein, channel measurement pilot frequency on average takies m resource element on each Resource Block, and in each transmission cycle, channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m is 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 be predetermined group unit with two Resource Block, 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, perhaps, also can be predetermined group unit with three Resource Block, do not need to limit which resource element that specifically takies which Resource Block, as long as only take m resource element on average each Resource Block.
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 invention provides, base station side can adopt comparatively sparse mode transmitting channel measurement pilot frequency, thereby can reduce the performance degradation to LTE user, guarantees the performance of channel measurement, improves the throughput of LTE system.
In specific implementation process, the URS of base station side DMRS, Release 8 of two-way CRS, LTE Release 9/10 before transmission CSI-RS should avoid and the mapping position of PBCH, PDCCH, synchronizing signal and paging channel.And CSI-RS should avoid preceding two-way public guide frequency (CRS), the mapping symbols that PDCCH and URS take.
Send CSI-RS by the mapping symbols of avoiding URS, CRS and PDCCH etc., can keep the information such as CRS of LTE system to send, reduce and send the influence of CSI-RS LTE user, and high-order mimo and COMP are provided required pilot frequency information, have helped LTE-Advanced user and improve the single-link quality.
In order to guarantee time division duplex (Time Division Duplexing, abbreviate TDD as) frame structure and Frequency Division Duplexing (FDD) (Frequency Division Duplexing, abbreviating FDD as) frame structure carries out CoMP, and the channel measurement pilot frequency of the channel measurement pilot frequency of tdd frame structure sub-district and FDD frame structure sub-district should adopt consistent pattern design and reuse plan.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, i.e. the pattern of base station transmission CSI-RS can make FDD frame structure and tdd frame structure adopt consistent reuse plan.
Owing to fix with respect to the CSI-RS frequency domain position, therefore, this bright embodiment can support more sub-district CoMP participating, improves systematic function.
In specific implementation process, when base station side sends CSI-RS at each antenna port, can adopt the mode of Time Division Multiplexing quadrature to send, also can adopt the mode of frequency division multiplexing (FDM) quadrature to send, perhaps, also can adopt the mode of TDM+FDM quadrature to send.Thereby can avoid the phase mutual interference of the CSI-RS of a plurality of antenna ports transmissions.
In specific implementation process, antenna port quantity difference at base station side, in each transmission cycle, base station side will send m path channels measurement pilot frequency, particularly, m=2,4 or 8, when m=2, the pattern of the preceding two-way channel measurement pilot frequency of the pattern of 2 path channels measurement pilot frequency during with m=4 is identical, when m=4, the pattern of the preceding 4 path channels measurement pilot frequency of the pattern of 4 path channels measurement pilot frequency during with m=4 is identical.
When 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 symbols of a Resource Block, for each OFDM symbol, take k subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+j)≤and N, N is the sum of a subcarrier that Resource Block comprised;
Preferably, above-mentioned j=6.
2, take 2 OFDM symbols of a Resource Block, for each OFDM symbol, take k subcarrier, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+j+2)≤N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=4.
3, take 2 OFDM symbols of a Resource Block, for each OFDM symbol, take k subcarrier, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+3j)≤N, N is the sum of a subcarrier that Resource Block comprised;
Preferably, j=2.
4, take 2 OFDM symbols of a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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) of this OFDM symbol, wherein, k and j are natural number, and (2k+3j+4)≤N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=1.
5, take 2 OFDM symbols of a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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 of this OFDM symbol, wherein, k and j are natural number, and (2k+j+6)≤N, N is the sum of a subcarrier that Resource Block comprised.
Preferably, j=4.
For further understanding the technical scheme that the embodiment of the invention provides, be example with the LTE-Advance system below, the specific embodiment of the transmission pattern of 8 path channels measurement pilot frequency is described.
Embodiment one
The pattern that Fig. 4 repeats to send with certain cycle for CSI-RS in the present embodiment, 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 each Resource Block (RB) repeats pattern shown in Figure 4 on the full bandwidth of the shared frequency domain of CSI-RS transmission subframe LTE-A.
As shown in Figure 4, in the present embodiment, to be the predetermined composition unit with a RB uniformly-spaced repeat to send at full bandwidth channel measurement pilot frequency, and 8 road CSI-RS lay respectively on the 6th, 9,11,14 2 the OFDM symbols that send subframe.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, and 7 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 6th symbol.Keeping under the constant at interval prerequisite of time-frequency, the mapping order of the initial position antenna port of this pattern can be adjusted flexibly.
Need to prove, be 12 as long as guarantee subcarrier spacing, and then the shared running time-frequency resource position of each road CSI-RS can be changed mutually.
Embodiment two
As shown in Figure 5, in the present embodiment, to be the predetermined composition unit with a RB uniformly-spaced repeat to send at full bandwidth channel measurement pilot frequency, and 8 road CSI-RS lay respectively on the 6th, 9,11,14 2 the OFDM symbols that send subframe.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, and 7 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 14th symbol.Keeping under the constant at interval prerequisite of time-frequency, the mapping order of the initial position antenna port of this pattern can be adjusted flexibly.
Embodiment three
In the present embodiment, 8 road CSI-RS repeat to send pattern shown in Figure 5 with certain cycle, and CSI-RS takies a subframe transmission in each cycle.
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 on the full bandwidth of the shared frequency domain of CSI-RS transmission subframe LTE-A repeats pattern shown in Figure 6.
As shown in Figure 6, channel measurement pilot frequency is that the predetermined composition unit uniformly-spaced repeats to send at full bandwidth with a RB, 8 the tunnel are positioned at the 9th of transmission subframe, on 11 OFDM symbols, 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 11st 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, and 7 path channels measurement pilot frequency are mapped on the 3rd subcarrier of the 9th symbol.Keeping under the constant at interval prerequisite of time-frequency, the mapping order of the initial position antenna port of this pattern can be adjusted flexibly.
Need to prove, in embodiments of the present invention, be 12 as long as guarantee subcarrier spacing, and each road CSI-RS can change shared running time-frequency resource position mutually.
Embodiment four
As shown in Figure 7, in the present embodiment, channel measurement pilot frequency is that the predetermined composition unit uniformly-spaced repeats to send at full bandwidth with a RB, 8 the tunnel are positioned at the 9th of transmission subframe, on 11 OFDM symbols, 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, and 6 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 9th symbol, and 7 path channels measurement pilot frequency are mapped on the 10th subcarrier of the 11st symbol.Keeping under the constant at interval prerequisite of time-frequency, the mapping order of the initial position antenna port of this pattern can be adjusted flexibly.
Embodiment five
In the present embodiment, 4 road or 8 road CSI-RS repeat to send pattern shown in Figure 8 with certain cycle, and CSI-RS takies a subframe transmission in each cycle.
In the present embodiment, the frequency domain interval of each map unit of CSI-RS is 24 subcarriers, and per two RB that send at CSI-RS on the full bandwidth of the shared frequency domain of sub-LTE-A repeat pattern shown in Figure 8.
As shown in Figure 8, channel measurement pilot frequency is whole frequency domain resource first-class repeat intervally to send of predetermined composition unit at LTE-A with two each and every one RB, 8 path channels measurement pilot frequency lay respectively at and send the 4th of subframe, on 11 OFDM symbols, wherein, the 1st path channels measurement pilot frequency is mapped on the 4th subcarrier of the 12nd subcarrier of the 9th symbol and the 11st symbol, the 2nd path channels measurement pilot frequency is mapped on the 12nd subcarrier of the 4th subcarrier of the 9th symbol and the 11st symbol, the 3rd path channels measurement pilot frequency is mapped on the 3rd subcarrier of the 11st subcarrier of the 9th symbol and the 11st symbol, and the 4th path channels measurement pilot frequency is mapped on the 11st subcarrier of the 3rd subcarrier of the 9th symbol and the 11st symbol; The 5th path channels measurement pilot frequency is mapped on the 2nd subcarrier of the 10th subcarrier of the 9th symbol and the 11st symbol, the 6th path channels measurement pilot frequency is mapped on the 10th subcarrier of the 2nd subcarrier of the 9th symbol and the 11st symbol, the 7th path channels measurement pilot frequency is mapped on the 1st subcarrier of the 9th subcarrier of the 9th symbol and the 11st symbol, and the 8th path channels measurement pilot frequency is mapped on the 9th subcarrier of the 1st subcarrier of the 9th symbol and the 11st symbol.Keeping under the constant at interval prerequisite of time-frequency, initial position of this pattern and the mapping of antenna port order can be adjusted flexibly.Need to prove, in the present embodiment, be 6 as long as guarantee subcarrier spacing, and then the shared running time-frequency resource position of each road CSI-RS also can be changed mutually.
Embodiment six
As shown in Figure 9, in the present embodiment, channel measurement pilot frequency is whole frequency domain resource first-class repeat intervally to send of predetermined composition unit at LTE-A with two each and every one RB, 8 path channels measurement pilot frequency lay respectively at and send the 9th of subframe, on 11 OFDM symbols, wherein, the 1st path channels measurement pilot frequency is mapped on the 9th subcarrier of the 1st subcarrier of the 9th symbol and the 11st symbol, the 2nd path channels measurement pilot frequency is mapped on the 1st subcarrier of the 9th subcarrier of the 9th symbol and the 11st symbol, the 3rd path channels measurement pilot frequency is mapped on the 11st subcarrier of the 3rd subcarrier of the 9th symbol and the 11st symbol, and the 4th path channels measurement pilot frequency is mapped on the 3rd subcarrier of the 11st subcarrier of the 9th symbol and the 11st symbol; The 5th path channels measurement pilot frequency is mapped on the 10th subcarrier of the 2nd subcarrier of the 9th symbol and the 11st symbol, the 6th path channels measurement pilot frequency is mapped on the 2nd subcarrier of the 10th subcarrier of the 9th symbol and the 11st symbol, the 7th path channels measurement pilot frequency is mapped on the 12nd subcarrier of the 4th subcarrier of the 9th symbol and the 11st symbol, and the 8th path channels measurement pilot frequency is mapped on the 4th subcarrier of the 12nd subcarrier of the 9th symbol and the 11st symbol.Keeping under the constant at interval prerequisite of time-frequency, the mapping order of the initial position antenna port of this pattern can be adjusted flexibly.
In sum,, kept the CRS of LTE system to send by the present invention, very little to the LTE customer impact, and high-order mimo and the required pilot frequency information of COMP are provided, help LTE-Advanced user and improve the single-link quality.In addition,, reduced performance degradation, and design overhead is low, can guarantees the performance of channel measurement, can improve the LTE-A throughput of system LTE user owing to adopted more sparse design.And, in embodiments of the present invention, fix with respect to the CSI-RS frequency domain position, therefore, can support more sub-district CoMP participating, improved systematic function.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a channel measurement pilot frequency sending method is characterized in that, comprising:
Base station side is in its each antenna port transmitting channel measurement pilot frequency periodically, wherein, described channel measurement pilot frequency on average takies m resource element on each Resource Block, and in each transmission cycle, described channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m is the quantity of the antenna port of described base station side.
2. method according to claim 1, it is characterized in that, described base station side sends described channel measurement pilot frequency and comprises: described base station side is avoided the shared resource element of predetermined information and is sent described channel measurement pilot frequency, wherein, described predetermined information comprises: the descending special pilot frequency of preceding 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 each described method in the claim 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. according to each described method in the claim 1 to 3, it is characterized in that, in each transmission cycle, described channel measurement pilot frequency comprises the m road, described m=2,4 or 8, when m=2, the pattern of the preceding two-way channel measurement pilot frequency of the pattern of the described channel measurement pilot frequency in m road during with m=4 is identical, and when m=4, the pattern of the preceding 4 path channels measurement pilot frequency of the pattern of the described channel measurement pilot frequency in m road during with m=4 is identical.
6. method according to claim 5 is characterized in that, when m=8, the pattern of 8 path channels measurement pilot frequency is:
Take 4 OFDM symbols of a Resource Block,, take k subcarrier and (k+j) individual subcarrier of this OFDM symbol respectively for each OFDM symbol, wherein, k and j are natural number, and (2k+j)≤N, N is the sum of a subcarrier that Resource Block comprised.
7. method according to claim 6 is characterized in that, described j=6.
8. method according to claim 5 is characterized in that, when m=8, the pattern of 8 path channels measurement pilot frequency is:
Take 2 OFDM symbols of a Resource Block, for each OFDM symbol, take k subcarrier, (k+1) individual subcarrier, (k+1+j) individual subcarrier and (k+1+j+1) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+j+2)≤and N, N is the sum of a subcarrier that Resource Block comprised.
9. method according to claim 8 is characterized in that, described j=4.
10. method according to claim 5 is characterized in that, when m=8, the pattern of 8 path channels measurement pilot frequency is:
Take 2 OFDM symbols of a Resource Block, for each OFDM symbol, take k subcarrier, (k+j) individual subcarrier, (k+2j) individual subcarrier and (k+3j) individual subcarrier of this OFDM symbol respectively, wherein, k and j are natural number, and (2k+3j)≤and N, N is the sum of a subcarrier that Resource Block comprised.
11. method according to claim 10 is characterized in that, described j=2.
12. method according to claim 5 is characterized in that, when m=8, the pattern of 8 path channels measurement pilot frequency is:
Take 2 OFDM symbols of a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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) of this OFDM symbol, wherein, k and j are natural number, and (2k+3j+4)≤and N, N is the sum of a subcarrier that Resource Block comprised.
13. method according to claim 12 is characterized in that, described j=1.
14. method according to claim 5 is characterized in that, when m=8, the pattern of 8 path channels measurement pilot frequency is:
Take 2 OFDM symbols of a Resource Block in 2 two Resource Block, for each OFDM symbol, take k subcarrier, (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 of this OFDM symbol, wherein, k and j are natural number, and (2k+j+6)≤and N, N is the sum of a subcarrier that Resource Block comprised.
15. method according to claim 14 is characterized in that, described j=4.
16. base station, it is characterized in that, described base station is used in its each antenna port transmitting channel measurement pilot frequency periodically, and wherein, described channel measurement pilot frequency on average takies m resource element on each Resource Block, and in each transmission cycle, described channel measurement pilot frequency takies n orthogonal frequency division multiplex OFDM symbol, n=1,2 or 4, m is the quantity of the antenna port of described base station, and m and n are natural number.
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| WO2011097939A1 (en) | 2011-08-18 |
| CN102158292B (en) | 2016-01-20 |
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