CN101964706B - Pilot frequency multiplexing determination method and device based on hybrid multiplexing - Google Patents
Pilot frequency multiplexing determination method and device based on hybrid multiplexing Download PDFInfo
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Abstract
The invention discloses a pilot frequency multiplexing mode determination method based on hybrid multiplexing, which comprises the following steps of: adopting the same pilot frequency multiplexing mode among layers corresponding to the same codeword stream, and adopting the same or different pilot frequency multiplexing modes among layers corresponding to different codeword streams; or grouping layers supported by the system, adopting the same pilot frequency multiplexing mode among layers in the same group, and adopting different pilot frequency multiplexing modes among layers in different groups. The invention also discloses a device for realizing the method, which comprises a layering unit and a multiplexing unit, wherein the layering unit is used for layering the same codeword stream or grouping the layers supported by the system; the multiplexing unit is used for adopting the same pilot frequency multiplexing mode among the layers corresponding to the same codeword stream and adopting the same or different pilot frequency multiplexing modes among the layers corresponding to different codeword streams, or adopting the same pilot frequency multiplexing mode among the layers in the same group, and adopting different pilot frequency multiplexing modes among the layers in different groups. The invention enables the applicability of UE (User Equipment) speed to be stronger.
Description
Technical field
The present invention relates to pilot frequency multiplexing technology, particularly relate to a kind of pilot frequency multiplexing mode defining method based on hybrid multiplex and device.
Background technology
High-order multi-antenna technology is one of key technology of senior Long Term Evolution (LTE-A or LTE-Advanced, Long TermEvolution Advanced) system, in order to improve system transfer rate.In order to realize the channel quality measurement after introducing high-order multi-antenna technology and data demodulates, LTE-Advanced system respectively defines two class frequency pilot signs: data demodulates pilot tone (DMRS, Demodulation Reference Signal) and channel quality measurement pilot tone (CSI-RS, Channel State Information-Reference Signal), wherein, demodulation pilot frequency is used for the reference symbol of Physical Downlink Shared Channel (PDSCH, Physical Downlink SharedChannel) demodulation.The reference symbol that measurement pilot frequency is measured for CSI (channel state information) indicates (CQI for channel quality, Channel Quality Indicator), pre-coding matrix instruction (PMI, Precoding Matrix Indicator), the reporting of stratum's instruction information such as (RI, Rank Indicator).The structure of two class reference symbols may be used for supporting as multipoint cooperative (CoMP, CoordinatedMulti-Point), the new technical feature of the LTE-A such as spatial reuse.
The design principle of demodulation reference mark expands to multilayer based on the concept of the specific reference symbol of R8UE.But, adopt the specific reference symbol in the community of R8 not foreclose completely.
Due in LTE R8, the maximum dedicated pilot number of layers that UE supports is one, and in R9, the maximum pilot tone that UE supports becomes number to be two.Therefore the pilot design of layer one and layer two needs the problem considering backwards compatibility.
In lte-a system, the maximum pilot tone number of layers supported is 8, in current research, the multiplex mode of demodulation pilot frequency mainly considers following Three models: frequency division multiplexing (FDM, Frequency DividedMultiplexing), time division multiplexing (TDM, Time Divided Multiplexing), code division multiplexing (CDM, Code Divided Multiplexing).But because DMRS needs to carry out precoding with PDSCH data according to identical mode, in order to keep identical power with the carrier wave of data, need in fdm mode to carry out power excursion (power offset) to DMRS.This needs extra control signal to notify user with regard to requiring under multi-user's Multiinputoutput (MU-MIMO) pattern.And when the number of users that different resource block is multiplexing is different, power offset is different.Therefore larger difficulty is caused to the design of DMRS.And based on the design of CDM, because the form of pilot tone is identical with the form of PDSCH data, therefore the compatibility of DMRS design under different transmission mode is more convenient to, but CDM pattern, require that the channel coefficients on the resource carrier wave that code divides is substantially constant, under high speed and large delay scene, be difficult to ensure.Therefore FDM and CDM can be considered to combine consideration design.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of pilot frequency multiplexing mode defining method based on hybrid multiplex and device, by the pilot frequency multiplexing mode based on hybrid mode, improves the gain of system.
For achieving the above object, technical scheme of the present invention is achieved in that
Based on a pilot frequency multiplexing mode defining method for hybrid multiplex, comprising:
Adopt identical pilot frequency multiplexing mode between each layer that same streams of code words is corresponding, between each layer that different streams of code words is corresponding, adopt identical or different pilot frequency multiplexing mode; Or, the layer that system is supported is divided into groups, between each layer in same group, adopts identical pilot frequency multiplexing mode, between the layer of different group, adopt different pilot frequency multiplexing modes.
Preferably, between the layer between each layer that described same streams of code words is corresponding or in same group, adopt frequency division multiplexing FDM, or time division multiplexing tdm, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Carry out multiplexing by the mode of code division multiplexing CDM to pilot tone between layer in the layer that different streams of code words is corresponding or different groups.
Preferably, when carrying out code division multiplexing between the layer between the layer that described different streams of code words is corresponding or in different groups, between the layer that the level number in the layer that group is interior or streams of code words is corresponding is different, CDM mode is adopted to carry out multiplexing to pilot tone.
Preferably, the mode of CDM is adopted to carry out multiplexing to pilot tone between the layer between each layer that described same streams of code words is corresponding or in same group; FDM is adopted between layer between each layer that different streams of code words is corresponding or in different groups, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
Preferably, layer in the layer that described different streams of code words is corresponding or different groups adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that time domain is adjacent, the Resource Unit of frequency domain adopts FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Or each layer corresponding to different streams of code words adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that frequency domain is adjacent, on other Resource Units of frequency domain or different time domain Resource Unit adopt FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
Preferably, the frequency domain interval of the pilot tone on described same orthogonal frequency division multiplex OFDM symbol is 2, or 3, or 6, or 12 subcarriers.Here the frequency domain interval between pilot tone refers to carries out the multiplexing layer of CDM and frequency domain Adjacent resource unit carry out pilot resources cell block that the multiplexing layer of FDM forms and next organizes the frequency domain interval of the pilot resources cell block of layer over the frequency domain.
Preferably, the length of the orthogonal code under described CDM multiplex mode is the minimum even number being more than or equal to maximum group of number or maximum reusable code word fluxion.
Preferably, the corresponding relation of the layer of described employing code division multiplexing is: streams of code words or group i-th layer of m and streams of code words or organize the of n
Layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m＝0～M-1，n＝0～M-1。
Preferably, the time-domain position that described pilot tone takies in the subframe of normal cyclic prefix is: the 4th, 6 or 6,7 orthogonal frequency OFDM symbol of even timeslots, the 4th, 6 or 6,7 or 3,4 OFDM symbol of odd numbered slots;
The time-domain position that described pilot tone takies in the subframe of extended cyclic prefix is: the 5th, 6 OFDM symbol of even timeslots, the 5th, 6 OFDM symbol of odd numbered slots.
Preferably, the length of the orthogonal code under described CDM multiplex mode is determined by current group of number or current multiplexing code word fluxion, when group number or code word fluxion M are odd number and are not 1, orthogonal code length when orthogonal code length under described CDM multiplex mode and code word fluxion are M+ (2k-1) is identical, wherein k be more than or equal to 1 positive integer, { the code word fluxion of M, L, M+2k-1} adopts identical pilot tone mapping pattern and mapping mode to belong to set; When M is 1, described pilot tone does not carry out orthogonal code spread spectrum process.
Preferably, when described employing CDM mode is to described pilot frequency multiplexing, in adjacent different districts, employing is similar to or completely orthogonal orthogonal code carries out spread processing to described pilot tone.
Based on a pilot frequency multiplexing mode determining device for hybrid multiplex, comprising:
Delaminating units, for carrying out layering for same streams of code words, or, the layer that system is supported is divided into groups; And
Multiplexing Unit, for adopting identical pilot frequency multiplexing mode between each layer that same streams of code words is corresponding, adopts identical or different pilot frequency multiplexing mode between each layer that different streams of code words is corresponding; Or, adopt identical pilot frequency multiplexing mode between each layer in same group, between the layer of different group, adopt different pilot frequency multiplexing modes.
Preferably, described Multiplexing Unit adopts FDM between the layer between each layer corresponding to same streams of code words or in same group, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Carry out multiplexing by the mode of CDM to pilot tone between layer in the layer that different streams of code words is corresponding or different groups.
Preferably, described Multiplexing Unit, to when carrying out code division multiplexing between the layer between layer corresponding to different streams of code words or in different groups, adopts CDM mode to carry out multiplexing to pilot tone between the layer that the level number in group or in layer corresponding to streams of code words is different.
Preferably, described Multiplexing Unit adopts the mode of CDM to carry out multiplexing to pilot tone between the layer between each layer corresponding to same streams of code words or in same group; FDM is adopted between layer between each layer that different streams of code words is corresponding or in different groups, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
Preferably, the layer of described Multiplexing Unit in layer corresponding to different streams of code words or different groups adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that time domain is adjacent, the Resource Unit of frequency domain adopts FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Or each layer corresponding to different streams of code words adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that frequency domain is adjacent, on other Resource Units of frequency domain or different time domain Resource Unit adopt FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
Preferably, the length of the orthogonal code under described CDM multiplex mode is the minimum even number being more than or equal to maximum group of number or maximum reusable code word fluxion.
Preferably, described Multiplexing Unit determines to adopt the corresponding relation of layer of code division multiplexing be: streams of code words or group m i-th layer with streams of code words or organize the of n
Layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m＝0～M-1，n＝0～M-1。
Preferably, the time-domain position that described pilot tone takies in the subframe of normal cyclic prefix is: the 4th, 6 or 6,7 orthogonal frequency OFDM symbol of even timeslots, the 4th, 6 or 6,7 or 3,4 OFDM symbol of odd numbered slots;
The time-domain position that described pilot tone takies in the subframe of extended cyclic prefix is: the 5th, 6 OFDM symbol of even timeslots, the 5th, 6 OFDM symbol of odd numbered slots.
Preferably, the length of the orthogonal code under described CDM multiplex mode is determined by current group of number or current multiplexing code word fluxion, when group number or code word fluxion M are odd number and are not 1, orthogonal code length when orthogonal code length under described CDM multiplex mode and code word fluxion are M+ (2k-1) is identical, wherein k be more than or equal to 1 positive integer, { the code word fluxion of M, L, M+2k-1} adopts identical pilot tone mapping pattern and mapping mode to belong to set; When M is 1, described pilot tone does not carry out orthogonal code spread spectrum process.
Under present invention, avoiding MU-MIMO pattern, FDM mode is to the inaccurate inferior position of Interference Estimation.On the other hand, when adopting CDM mode, UE can be avoided at high speeds to the destruction of pilot orthogonality.The advantage of FDM and CDM is combined.What adopt code to divide between the layer by the correspondence by different code word is multiplexing, the multiplex mode of frequency division is adopted between same code word, under MU-MIMO pattern, for some users, this user use number of layers uniquely can determine the power excursion of the DMRS of active user relative to PDSCH data, therefore can save FDM pattern send a notice pilot tone relative to data power excursion required for extra control signal.Meanwhile, be the mode of FDM between the different layers due to same user, stronger to the applicability of UE speed.
Accompanying drawing explanation
Fig. 1 be that streams of code words number of the present invention is 2 and number of layers is 2 time pilot tone bearing mode schematic diagram;
Fig. 2 A be that streams of code words number of the present invention is 2 and number of layers is 3 or 4 time pilot tone bearing mode schematic diagram;
Fig. 2 B be that streams of code words number of the present invention is 1 and number of layers is 2 time pilot tone bearing mode schematic diagram;
Fig. 3 A be that streams of code words number of the present invention is 2 and number of layers is 5 or 6 time pilot tone bearing mode one schematic diagram;
Fig. 3 B be that streams of code words number of the present invention is 2 and number of layers is 5 or 6 time pilot tone bearing mode two schematic diagram;
Fig. 4 be that streams of code words number of the present invention is 2 and number of layers is 7 or 8 time pilot tone bearing mode schematic diagram;
Fig. 5 is that layer corresponding between the same streams of code words of the present invention adopts the pilot tone carrying schematic diagram adopting frequency division multiplexing mode between the layer of the multiplexing and different streams of code words of code point mode;
Fig. 6 A is the pilot tone bearing mode schematic diagram that two sub-carrier that frequency domain of the present invention is adjacent carry out CDM;
Fig. 6 B is the present invention is the pilot tone bearing mode schematic diagram that two subcarriers in two OFDM that time domain is adjacent carry out;
Fig. 7 adopts the pilot tone bearing mode schematic diagram adopting FDM and TDM hybrid mode multiplexing between the multiplexing and different streams of code words of CDM and FDM hybrid mode between the different layers between the same streams of code words of the present invention;
Fig. 8 is that the present invention expands pilot tone bearing mode schematic diagram multiplexing based on hybrid mode in CP situation;
Fig. 9 A is the pilot tone bearing mode schematic diagram that between the different group of the present invention, frequency domain adopts the interior employing of CDM group FDM and TDM mixing;
Fig. 9 B is the pilot tone bearing mode schematic diagram that between the different group of the present invention, time domain adopts the interior employing of CDM group FDM and TDM mixing;
Figure 10 is the pilot tone bearing mode schematic diagram adopting code division multiplexing in organizing under the present invention is based on Packet Multiplexing mode and adopt FDM and TDM hybrid multiplex between group;
Figure 11 is the composition structural representation of the pilot frequency multiplexing mode determining device that the present invention is based on hybrid multiplex.
Embodiment
Basic thought of the present invention is: what adopt code to divide between the layer by the correspondence by different code word is multiplexing, the multiplex mode of frequency division is adopted between same code word, under MU-MIMO pattern, for some users, this user use number of layers uniquely can determine the power excursion of the DMRS of active user relative to PDSCH data, therefore can save FDM pattern send a notice pilot tone relative to data power excursion required for extra control signal.Meanwhile, be the mode of FDM between the different layers due to same user, stronger to the applicability of UE speed.
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Below by several embodiment, embodiments of the present invention are described, wherein embodiment one to embodiment four be the mode adopting FDM or FDM and TDM mixing between layer corresponding to same code word, between different code words correspondence layer between use the mode of CDM.Embodiment five is that the layer between same code word adopts CDM, and the layer between the layer that different code word is corresponding adopts the situation of frequency division manner.In embodiment one to embodiment five, all for normal cyclic prefix (CP), and with the 4th of even timeslots (first time slot) the, 6OFDM symbols carry frequency pilot sign, the 4th, 6 OFDM symbol carrying frequency pilot sign of odd numbered slots is that example is described.In LTE system, in order to support the network deployment scenarios of different districts radius, define two kinds of circulating prefix-lengths, the frame structure of normal cyclic prefix and extended cyclic prefix, in the frame of normal cyclic prefix, each subframe (1ms) is made up of 14 OFDM symbol, and wherein each subframe divides 2 time slots (the every time slot of 0.5ms) further, and each time slot comprises 7 OFDM symbol; In the frame of expansion CP, each subframe (1ms) comprises 12 OFDM symbol, and each subframe comprises 2 time slots (the every time slot of 0.5ms), and each time slot comprises 6 OFDM symbol.In embodiment six, give the demodulation pilot frequency mapping relation of two kinds of rank2 ~ rank8 co-design, adopt the hybrid multiplex mode of FDM and TDM between the corresponding different layers of same streams of code words, between streams of code words, adopt the mode of CDM multiplexing.Embodiment seven gives the demodulation pilot frequency mapping mode of another rank2 ~ 8 co-design, adopts the hybrid mode of CDM+FDM, adopt FDM and TDM hybrid mode between different code word between the layer that same code word is corresponding.
Embodiment one
Fig. 1 be that streams of code words number of the present invention is 2 and number of layers is 2 time pilot tone bearing mode schematic diagram, as shown in Figure 1, based on the DMRS pilot design thought that the present invention describes, when streams of code words number is 2, a kind of pilot tone configurations when number of layers is 2, carries out frequency division multiple access with different orthogonal numerals between layer 1 and layer 2.Embodiment one is that example is described based on the frame of normal CP.If streams of code words 1 orthogonal code used is w
1=[w
11, w
12], the orthogonal code of streams of code words 2 is w
2=[w
21, w
22], p in figure
i, jrepresent i-th layer of corresponding jth frequency pilot sign.
The pilot tone of the upper multiplex stream 1 respectively of two Resource Units (RE, Resource Element) in Fig. 1 in each ellipse and stream 2 respective layer, then layer is expressed as in the upper multiplexing pilot signal of identical pilot resources unit (RE) for 1 layer 2
Adjacent carry out multiplexing pilot signal on Resource Unit that code divides and be expressed as
And use the code book V of precoding to carry out precoding, wherein V is N
tthe matrix of × L, N
trepresent transmitting antenna port number, L presentation layer number, L=2 in the present embodiment, and the 1st in V matrix arranges the precoding weights of corresponding ground floor, the precoding codebook of the 2nd corresponding 2nd layer of row.
Embodiment two
Fig. 2 A be that streams of code words number of the present invention is 2 and number of layers is 3 or 4 time pilot tone bearing mode schematic diagram, as shown in Figure 2 A, based on the DMRS design philosophy that the present invention describes, when streams of code words number is 2, a kind of pilot tone configurations when number of layers is 4, in figure, two layers that the corresponding streams of code words 1 of hypothetical layer 1, layer 2 uses; Layer 3, layer 4 correspond to two layers that streams of code words 2 uses.Then according to design principle of the present invention, carry out multiplexing with different orthogonal codes between layer 1 and layer 3, between layer 2 and layer 4, carry out code division multiplexing by different orthogonal codes; { 1,3} and layer { are undertaken multiplexing by the mode of frequency division between 2,4}, are namely positioned on different frequency resource unit layer.Same hypothesis streams of code words 1 orthogonal code used is w
1=[w
11, w
12], the orthogonal code of streams of code words 2 is w
2=[w
21, w
22].In the present invention, the corresponding relation of layer of code division multiplexing is adopted to be: streams of code words or group m i-th layer with streams of code words or organize the of n
Layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m＝0～M-1，n＝0～M-1。
The pilot tone of difference multiplex stream 1 and stream 2 respective layer on four RE in accompanying drawing 2 in each ellipse, its middle level 1 and layer 3 are mapped on identical pilot resources unit, and multiplexing pilot signal is expressed as
Adjacent carry out multiplexing pilot signal on Resource Unit that code divides and be expressed as
And carry out precoding with the code book V of precoding, as figure bend shown in the Resource Unit that marks, wherein V is N
tthe matrix of × L, N
trepresent transmitting antenna port number, L represents the maximum layer number that system is supported, L=4 in the present embodiment, and the 1st in V matrix arranges the precoding weights of corresponding ground floor, the precoding vectors of the 2nd corresponding 2nd layer of row, the precoding vectors of the 3rd corresponding 3rd layer of row, the precoding vectors of the 4th corresponding 4th layer of row.Layer 2 with layer 4, carries out multiplexing pilot tone mapping signal and is expressed as on identical pilot resources unit
Adjacent pilot signals of carrying out on Resource Unit that code divides is expressed as
Shown in Resource Unit position as corresponding in grid oblique in Fig. 2.
As seen from the figure, utilize the mode of frequency division multiplexing between same streams of code words, such as layer 1 and layer 2, between layer 3 and layer 4; The mode of being divided by code between different code stream stream is multiplexing, and such as layer 1 and layer 3, between layer 2 and layer 4.
It is 2 that this pattern same also goes for flow amount, situation when number of layers is 3.Difference to be only in now figure the pilot frequency sequence of no longer multiplex layer 4 correspondence on the oblique Resource Unit shown in grid.
Fig. 2 B be that streams of code words number of the present invention is 1 and number of layers is 2 time pilot tone bearing mode schematic diagram, as shown in Figure 2 B, above-mentioned pattern can be further optionally 1 for streams of code words number, and number of layers is the situation of 2, and the pilot signal on the Resource Unit now marked at oval bend is
And the pilot signal on the Resource Unit that marks of adjacent oblique line is
And the pilot signal on two Resource Units that in ellipse, oblique grid marks is respectively
With
In this manner, pilot density when streams of code words is 1 is streams of code words when being 2,2 times of every layer of average pilot density.
If in order to reduce pilot-frequency expense, make the pilot-frequency expense of every layer identical, a kind of processing mode is for no longer for every layer is carried out code and divides spread spectrum.Pilot tone pattern is now first row in each oval frame or secondary series (as the first row of even timeslots and the 2nd row of odd numbered slots), is the multiplex mode of frequency division between different layers simultaneously.
Embodiment three
Fig. 3 A be that streams of code words number of the present invention is 2 and number of layers is 5 or 6 time pilot tone bearing mode one schematic diagram, Fig. 3 B be that streams of code words number of the present invention is 2 and number of layers is 5 or 6 time pilot tone bearing mode one schematic diagram, as shown in Fig. 3 A, 3B, give two kinds of number of layers, be respectively 5 layers or 6 layers, and streams of code words number is when being 2, based on the pattern mapping mode under the method given by the present invention.Suppose that the layer that streams of code words maps is that { 1,2,3}, the layer that streams of code words 2 maps is { 4,5,6}.Wherein { Isosorbide-5-Nitrae }; { 2,5}; { between 3,6}, carry out code division multiplexing.Layer between same streams of code words carries out frequency division multiplexing.
When number of layers is 5, the pilot signal on the Resource Unit that grid square marks no longer corresponding to multiplex layer 6.
Equally, be 1 for streams of code words number, when number of layers is 3, no longer can carry out spread processing, pilot tone pattern is now first row in each oval frame or secondary series (as the first row of even timeslots and the 2nd row of odd numbered slots), is the multiplex mode of frequency division between different layers simultaneously.
Embodiment four
Fig. 4 be that streams of code words number of the present invention is 2 and number of layers is 7 or 8 time pilot tone bearing mode schematic diagram, as shown in Figure 4, giving number of layers is 7 or 8, and when streams of code words number is 2, based on the pattern mapping mode under the method given by the present invention.Suppose that the layer that streams of code words maps is that { 1,2,3,4}, the layer that streams of code words 2 maps is { 5,6,7,8}.Wherein { 1,5}; { 2,6}; { 3,7}; { between 4,8}, carry out code division multiplexing.Layer between same streams of code words carries out frequency division multiplexing.When number of layers is 7, the pilot signal on the Resource Unit that husky point marks no longer corresponding to multiplex layer 8.
Equally, be 1 for streams of code words number, when number of layers is 4, no longer can carry out spread processing, pilot tone pattern is now first row in each oval frame or secondary series (as the first row of even timeslots and the 2nd row of odd numbered slots), is the multiplex mode of frequency division between different layers simultaneously.
Embodiment one to embodiment four is adopt FDM to carry out multiplexing to pilot tone between layer corresponding to same code word, and layer corresponding between same code word uses the mode of CDM to carry out multiplexing to pilot tone.In the above embodiments, also situation corresponding for different embodiment can be merged.
Embodiment five
Fig. 5 is that layer corresponding between the same streams of code words of the present invention adopts the pilot tone carrying schematic diagram adopting frequency division multiplexing mode between the layer of the multiplexing and different streams of code words of code point mode, as shown in Figure 5, the Resource Unit that oblique line marks is the pilot tone mapping position of streams of code words 12 correspondence; The Resource Unit that oblique grid marks is the resource location that the pilot tone of streams of code words 2 correspondence maps.As seen from the figure, pilot tone mapping position corresponding to different streams of code words adopts the mode of frequency division to carry out multiplexing, and the mode adopting code to divide between different layers corresponding to same code word is carried out multiplexing.
Embodiment six
This gives the scheme of co-design in a kind of low rank and high rank situation, the subset of pattern when the DMRS pilot tone pattern wherein during low rank is high rank.
In the present embodiment, adopt the multiplex mode of FDM+TDM between the corresponding different layers of same streams of code words, between streams of code words, adopt the mode of CDM multiplexing.Fig. 6 A is the pilot tone bearing mode schematic diagram that two sub-carrier that frequency domain of the present invention is adjacent carry out CDM, Fig. 6 B is the present invention is the pilot tone bearing mode schematic diagram that two subcarriers in two OFDM that time domain is adjacent carry out, two kinds of modes as shown in Fig. 6 A, 6B, the RE that oblique line marks corresponding the 1st layer of streams of code words 1 and the 3rd layer of streams of code words two, the RE that oblique grid marks corresponding the 2nd layer of streams of code words 1 and the 4th layer of streams of code words 2; The RE that vertical curve marks corresponding the 3rd layer of streams of code words 1 and the 1st layer of streams of code words 2, the RE that husky point marks corresponding the 4th layer of streams of code words 1 and the 2nd layer of streams of code words 2.
As can be seen from the figure, streams of code words 1 correspondence 1,2,3,4} layer respectively at streams of code words 2 { 3,4,1,2} layer carries out code division multiplexing, and between the different layers of same streams of code words, { 1,2,3,4} corresponding DMRS occupies different frequency locations respectively.The difference of Fig. 6 A and Fig. 6 B is that Fig. 6 A is that two sub-carrier that frequency domain is adjacent carry out CDM; Fig. 6 B is that two subcarriers in two OFDM that time domain is adjacent carry out CDM.
Because the mode adopting code to divide between multiple code word is carried out multiplexing, therefore pilot tone does not need extra control signal notice relative to the power offset of PDSCH data in this case, only corresponding according to current code word layer, UE can obtain the power offset of pilot tone relative to PDSCH data.
Embodiment seven
This gives the another kind of scheme of co-design in a kind of low rank and high rank situation, the subset of pattern when the DMRS pilot tone pattern wherein during low rank is high rank
In the present embodiment, adopt the multiplex mode of CDM+FDM between the corresponding different layers of same streams of code words, between streams of code words, adopt the mode of FDM+TDM multiplexing.Fig. 7 adopts the pilot tone bearing mode schematic diagram adopting FDM and TDM hybrid mode multiplexing between the multiplexing and different streams of code words of CDM and FDM hybrid mode between the different layers between the same streams of code words of the present invention, as shown in Figure 7, oblique line and the RE that tiltedly grid marks are the demodulation pilot frequency mapping position of the different layers of streams of code words 1 correspondence, the RE that its bend marks represents that the position that the layer 1 of streams of code words 1 correspondence and the DMRS of layer 3 correspondence map, the RE that oblique grid marks are the position that the layer 2 of streams of code words 1 correspondence and the DMRS of layer 4 correspondence map; The RE that vertical curve and husky point mark is the demodulation pilot frequency mapping position of the different layers of streams of code words 2 correspondence, the RE that wherein vertical curve marks represents the position that the layer 1 of streams of code words 2 correspondence and the DMRS of layer 3 correspondence map, the husky RE marked that puts is the position that the layer 2 of streams of code words 2 correspondence and the DMRS of layer 4 correspondence map, as can be seen from Figure, and the layer { 1 of streams of code words 1 correspondence, 3} carries out code division multiplexing, { 2,4} carries out code division multiplexing, layer { 1, { 2,4} carries out frequency division multiplexing for 3} and layer; { 1,3} carries out code division multiplexing to the layer of streams of code words 2 correspondence, and { 2,4} carries out code division multiplexing, and { { 2,4} carries out frequency division multiplexing to layer for 1,3} and layer; And carry out frequency division multiplexing between streams of code words 1 and streams of code words 2.DMRS pilot tone during corresponding various low rank situation is the subset of 8 layers of (layer) situation
In such a mode, in MU-MOMO, the value of power offset has multiplexing code word number to determine completely.Suppose in MU-MIMO, the streams of code words number of each user is 1, and multiplexing number of users is fixed as 2, then the value of power offset is fixed as 2.Extra control signal notice is not needed yet.
In the present embodiment six to seven, in time domain, the symbol that pilot tone takies is the 4th, 7 OFDM symbol of even timeslots and 4,7 OFDM symbol of odd numbered slots.Here be only used to illustrate, be positioned at other OFDM symbol positions and belong to protection scope of the present invention equally.At frequency domain, the pilot interval between each the group pilot tone provided in the present embodiment is 2 subcarriers, and the situation of 3,6 or 12 subcarriers is equally within scope.In the present invention, the frequency domain interval here between each group pilot tone refers to carries out the multiplexing layer of CDM and frequency domain Adjacent resource unit carry out pilot resources cell block that the multiplexing layer of FDM forms and next organizes the frequency domain interval of the pilot resources cell block of layer over the frequency domain.As the carrier spacing in the present embodiment frequency domain between adjacent ellipses.
Embodiment eight
What the present embodiment provided is when expanding CP, based on a kind of DMRS mapping mode schematic diagram of the present invention:
In the present embodiment, adopt the multiplex mode of FDM+TDM between the corresponding different layers of same streams of code words, between streams of code words, adopt the mode of CDM multiplexing.Fig. 8 is that the present invention expands pilot tone bearing mode schematic diagram multiplexing based on hybrid mode in CP situation, as shown in Figure 8, the RE that oblique line marks corresponding the 1st layer of streams of code words 1 and the 3rd layer of streams of code words 2, the RE that oblique grid marks corresponding the 2nd layer of streams of code words 1 and the 4th layer of streams of code words 2; The RE that vertical curve marks corresponding the 3rd layer of streams of code words 1 and the 1st layer of streams of code words 2, the RE that husky point marks corresponding the 4th layer of streams of code words 1 and the 2nd layer of streams of code words 2.
In the present embodiment, the time-domain position of DMRS is: the 5th, 6 OFDM symbol of even timeslots and 5,6 OFDM symbol of odd numbered slots.
As can be seen from figure equally, streams of code words 1 correspondence 1,2,3,4} layer respectively at streams of code words 2 { 3,4,1,2} layer carries out code division multiplexing, and between the different layers of same streams of code words, { 1,2,3,4} corresponding DMRS occupies different frequency locations respectively.
Above-described embodiment is to adopt FDM mode multiplexing between same streams of code words, adopt CDM mode multiplexing between the embodiment adopting CDM multiplexing between different code word and same code word, the multiplexing two kinds of hybrid multiplex modes of FDM are adopted to be described between different code word, for other situations, the present invention is applicable equally.
Embodiment nine
Fig. 9 A is the pilot tone bearing mode schematic diagram that between the different group of the present invention, frequency domain adopts the interior employing of CDM group FDM and TDM mixing, Fig. 9 B is the pilot tone bearing mode schematic diagram that between the different group of the present invention, time domain adopts the interior employing of CDM group FDM and TDM mixing, as shown in Fig. 9 A, 9B, illustrate only maximum layer number in figure is 8, and be divided into the pilot tone bearing mode of two groups, but the present invention is not restricted to this.
In the present embodiment, { 1,2,3,4} is one group to layer, is designated as group 1, and { 5,6,7,8} is one group to layer, is designated as group 2; Undertaken multiplexing by the hybrid mode of FDM and TDM between layer between often in group.Layer between group is undertaken multiplexing by the mode of CDM.Therefore, the RE position that the multiplexing layer of CDM takies is carried out between different groups identical.And the RE position that in group, different layers takies is different.The layer 1 wherein organizing 1 carries out code division multiplexing with the layer 5 in group 2, and the layer 2 organizing 1 carries out code division multiplexing with the layer 6 in group 2, and layer 3 and the layer 7 organized in 2 of organizing 1 carry out code division multiplexing, and layer 4 and the layer 8 organized in 2 of organizing 1 carry out code division multiplexing.When carrying out other layers organized that code division multiplexing mates in each group with certain layer and not existing, now this layer of corresponding sequence is mapped on corresponding RE by the mode of orthogonal code spread spectrum with regard to becoming, and it is multiplexing not carry out CDM.Time domain in this embodiment or frequency domain position are only used to signal, do not limit.
Embodiment ten
Figure 10 is the pilot tone bearing mode schematic diagram adopting code division multiplexing in organizing under the present invention is based on Packet Multiplexing mode and adopt FDM and TDM hybrid multiplex between group, as shown in Figure 10, in the present embodiment, { 1,2,5,6} is divided into one group, be designated as group 1, { 3,4,7,8} is one group, is designated as group 2, and the mode utilizing code to divide in group is carried out multiplexing.Utilize the mode of frequency division to carry out between group 1 and group 2 multiplexing, the RE that each layer carrying out code division multiplexing takies is identical.Time domain in this embodiment or frequency domain position are only used to signal, do not limit.
Simply show maximum layer number in figure is 8, and is divided into the design of 2 groups to illustrate, but the present invention is not restricted to this.
Figure 11 is the composition structural representation of the pilot frequency multiplexing mode determining device that the present invention is based on hybrid multiplex, as shown in figure 11, the pilot frequency multiplexing mode determining device that the present invention is based on hybrid multiplex comprises delaminating units 110 and Multiplexing Unit 111, wherein, delaminating units 110 is for carrying out layering for same streams of code words, or, the layer that system is supported is divided into groups; Multiplexing Unit 111, for adopting identical pilot frequency multiplexing mode between each layer that same streams of code words is corresponding, adopts identical or different pilot frequency multiplexing mode between each layer that different streams of code words is corresponding; Or, adopt identical pilot frequency multiplexing mode between each layer in same group, between the layer of different group, adopt different pilot frequency multiplexing modes.Multiplexing Unit 111 adopts frequency division multiplexing FDM between the layer between each layer corresponding to same streams of code words or in same group, or time division multiplexing tdm, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Carry out multiplexing by the mode of code division multiplexing CDM to pilot tone between layer in the layer that different streams of code words is corresponding or group.Multiplexing Unit 111, to when carrying out code division multiplexing between the layer between layer corresponding to different streams of code words or in different groups, adopts CDM mode to carry out multiplexing to pilot tone between the layer that the level number in group or in layer corresponding to streams of code words is different.Multiplexing Unit 111 adopts the mode of CDM to carry out multiplexing to pilot tone between the layer between each layer corresponding to same streams of code words or in same group; FDM is adopted between layer between each layer that different streams of code words is corresponding or in group, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.The layer of Multiplexing Unit 111 in layer corresponding to different streams of code words or different groups adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that time domain is adjacent, the Resource Unit of frequency domain adopts FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Or each layer corresponding to different streams of code words adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that frequency domain is adjacent, on other Resource Units of frequency domain or different time domain Resource Unit adopt FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.The frequency domain interval of the pilot tone on same orthogonal frequency division multiplex OFDM symbol is 3, or 6, or 12 subcarriers.The length of the orthogonal code under described CDM multiplex mode is the minimum even number being more than or equal to maximum group of number or maximum reusable code word fluxion.Multiplexing Unit 111 determines to adopt the corresponding relation of layer of code division multiplexing be: streams of code words or group m i-th layer with streams of code words or organize the of n
Layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m＝0～M-1，n＝0～M-1。The time-domain position that pilot tone takies in the subframe of normal cyclic prefix is: the 4th, 6 or 6,7 orthogonal frequency OFDM symbol of even timeslots, the 4th, 6 or 6,7 or 3,4 OFDM symbol of odd numbered slots;
The time-domain position that described pilot tone takies in the subframe of extended cyclic prefix is: the 5th, 6 OFDM symbol of even timeslots, the 5th, 6 OFDM symbol of odd numbered slots.
20, device according to claim 13, it is characterized in that, the length of the orthogonal code under described CDM multiplex mode is determined by current group of number or current multiplexing code word fluxion, when group number or code word fluxion M are odd number and are not 1, orthogonal code length when orthogonal code length under described CDM multiplex mode and code word fluxion are M+ (2k-1) is identical, wherein k be more than or equal to 1 positive integer; When M is 1, described pilot tone does not carry out orthogonal code spread spectrum process.
Those skilled in the art are to be understood that, the pilot frequency multiplexing mode determining device based on hybrid multiplex shown in Figure 11 arranges for realizing the aforesaid pilot frequency multiplexing mode defining method based on hybrid multiplex, and the practical function of each processing unit in figure can refer to the associated description of preceding method and understands.In device shown in Figure 11, the function of each unit realizes by the program run on processor, also realizes by concrete logical circuit.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (16)
1., based on a pilot frequency multiplexing mode defining method for hybrid multiplex, it is characterized in that, comprising:
Adopt identical pilot frequency multiplexing mode between each layer that same streams of code words is corresponding, between each layer that different streams of code words is corresponding, adopt identical or different pilot frequency multiplexing mode; Or, the layer that system is supported is divided into groups, between each layer in same group, adopts identical pilot frequency multiplexing mode, between the layer of different group, adopt different pilot frequency multiplexing modes;
Frequency division multiplexing FDM is adopted between layer between each layer that described same streams of code words is corresponding or in same group, or time division multiplexing tdm, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Carry out multiplexing by the mode of code division multiplexing CDM to pilot tone between layer in the layer that different streams of code words is corresponding or different groups;
Or, between the layer between each layer that described same streams of code words is corresponding or in same group, adopt the mode of CDM to carry out multiplexing to pilot tone; FDM is adopted between layer between each layer that different streams of code words is corresponding or in different groups, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
2. method according to claim 1, it is characterized in that, when carrying out code division multiplexing between the layer between the layer that described different streams of code words is corresponding or in different groups, between the layer that the level number in the layer that group is interior or streams of code words is corresponding is different, CDM mode is adopted to carry out multiplexing to pilot tone.
3. method according to claim 1, it is characterized in that, layer in the layer that described different streams of code words is corresponding or different groups adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that time domain is adjacent, the Resource Unit of frequency domain adopts FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Or each layer corresponding to different streams of code words adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that frequency domain is adjacent, on other Resource Units of frequency domain or different time domain Resource Unit adopt FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
4. method according to claim 3, is characterized in that, the frequency domain interval of the pilot tone on described same orthogonal frequency division multiplex OFDM symbol is 2, or 3, or 6, or 12 subcarriers.
5. method according to claim 1, is characterized in that, the length of the orthogonal code under described CDM multiplex mode is the minimum even number being more than or equal to maximum group of number or maximum reusable code word fluxion.
6. method according to claim 2, is characterized in that, the corresponding relation of the layer of described employing code division multiplexing is: streams of code words or group i-th layer of m and streams of code words or organize the of n
layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m=0 ~ M-1, n=0 ~ M-1.
7. method according to claim 1, it is characterized in that, the time-domain position that described pilot tone takies in the subframe of normal cyclic prefix is: the 4th, 6 or 6,7 orthogonal frequency OFDM symbol of even timeslots, the 4th, 6 or 6,7 or 3,4 OFDM symbol of odd numbered slots;
The time-domain position that described pilot tone takies in the subframe of extended cyclic prefix is: the 5th, 6 OFDM symbol of even timeslots, the 5th, 6 OFDM symbol of odd numbered slots.
8. method according to claim 1, it is characterized in that, the length of the orthogonal code under described CDM multiplex mode is determined by current group of number or current multiplexing code word fluxion, when group number or code word fluxion M are odd number and are not 1, orthogonal code length when orthogonal code length under described CDM multiplex mode and code word fluxion are M+ (2k-1) is identical, wherein k be more than or equal to 1 positive integer, belong to set { M, ..., the code word fluxion of M+2k-1} adopts identical pilot tone mapping pattern and mapping mode; When M is 1, described pilot tone does not carry out orthogonal code spread spectrum process.
9. method according to claim 1 and 2, is characterized in that, when described employing CDM mode is to described pilot frequency multiplexing, in adjacent different districts, employing is similar to or completely orthogonal orthogonal code carries out spread processing to described pilot tone.
10., based on a pilot frequency multiplexing mode determining device for hybrid multiplex, it is characterized in that, comprising:
Delaminating units, for carrying out layering for same streams of code words, or, the layer that system is supported is divided into groups; And
Multiplexing Unit, for adopting identical pilot frequency multiplexing mode between each layer that same streams of code words is corresponding, adopts identical or different pilot frequency multiplexing mode between each layer that different streams of code words is corresponding; Or, adopt identical pilot frequency multiplexing mode between each layer in same group, between the layer of different group, adopt different pilot frequency multiplexing modes;
Described Multiplexing Unit adopts FDM between the layer between each layer corresponding to same streams of code words or in same group, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Carry out multiplexing by the mode of CDM to pilot tone between layer in the layer that different streams of code words is corresponding or different groups;
Or, between the layer between each layer corresponding to same streams of code words or in same group, adopt the mode of CDM to carry out multiplexing to pilot tone; FDM is adopted between layer between each layer that different streams of code words is corresponding or in different groups, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
11. devices according to claim 10, it is characterized in that, described Multiplexing Unit, to when carrying out code division multiplexing between the layer between layer corresponding to different streams of code words or in different groups, adopts CDM mode to carry out multiplexing to pilot tone between the layer that the level number in group or in layer corresponding to streams of code words is different.
12. devices according to claim 10, it is characterized in that, the layer of described Multiplexing Unit in layer corresponding to different streams of code words or different groups adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that time domain is adjacent, the Resource Unit of frequency domain adopts FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone; Or each layer corresponding to different streams of code words adopts CDM mode to carry out multiplexing to pilot tone on the different resource unit that frequency domain is adjacent, on other Resource Units of frequency domain or different time domain Resource Unit adopt FDM, or TDM, or the mode of FDM and TDM mixing is carried out multiplexing to pilot tone.
13. devices according to claim 10, is characterized in that, the length of the orthogonal code under described CDM multiplex mode is the minimum even number being more than or equal to maximum group of number or maximum reusable code word fluxion.
14. devices according to claim 11, is characterized in that, described Multiplexing Unit determines to adopt the corresponding relation of layer of code division multiplexing be: streams of code words or group m i-th layer with streams of code words or organize the of n
layer carries out code division multiplexing, and wherein, M represents the number of streams of code words, and L represents the maximum number of plies that system is supported, n ≠ m,
m=0 ~ M-1, n=0 ~ M-1.
15. devices according to claim 10, it is characterized in that, the time-domain position that described pilot tone takies in the subframe of normal cyclic prefix is: the 4th, 6 or 6,7 orthogonal frequency OFDM symbol of even timeslots, the 4th, 6 or 6,7 or 3,4 OFDM symbol of odd numbered slots;
The time-domain position that described pilot tone takies in the subframe of extended cyclic prefix is: the 5th, 6 OFDM symbol of even timeslots, the 5th, 6 OFDM symbol of odd numbered slots.
16. devices according to claim 10, it is characterized in that, the length of the orthogonal code under described CDM multiplex mode is determined by current group of number or current multiplexing code word fluxion, when group number or code word fluxion M are odd number and are not 1, orthogonal code length when orthogonal code length under described CDM multiplex mode and code word fluxion are M+ (2k-1) is identical, wherein k be more than or equal to 1 positive integer, belong to set { M, the code word fluxion of L, M+2k-1} adopts identical pilot tone mapping pattern and mapping mode; When M is 1, described pilot tone does not carry out orthogonal code spread spectrum process.
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| CN108616340B (en) * | 2016-12-12 | 2020-10-09 | 华为技术有限公司 | Method and device for transmitting pilot signal |
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| CN109547185B (en) * | 2017-04-28 | 2020-03-20 | 华为技术有限公司 | Method for sending and receiving reference signal, network equipment and terminal equipment |
| CN108111266B (en) * | 2017-05-05 | 2022-08-19 | 中兴通讯股份有限公司 | Configuration method of demodulation reference signal, communication device and communication node |
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| CN101465718A (en) * | 2009-01-21 | 2009-06-24 | 中兴通讯股份有限公司 | Method and apparatus for mapping codeword current to layer in multi-input multi-output system |
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| CN101465718A (en) * | 2009-01-21 | 2009-06-24 | 中兴通讯股份有限公司 | Method and apparatus for mapping codeword current to layer in multi-input multi-output system |
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